U.S. patent application number 10/830475 was filed with the patent office on 2004-10-07 for system of components for preparing oligonucleotides.
Invention is credited to Baker, Brenda F., Borchers, Alexander H., Brooks, Douglas G., Cowsert, Lex M., Freier, Susan M., McNeil, John, Ohashi, Cara, Sasmor, Henri M., Vickers, Timothy A., Wyatt, Jacqueline R..
Application Number | 20040197814 10/830475 |
Document ID | / |
Family ID | 22077363 |
Filed Date | 2004-10-07 |
United States Patent
Application |
20040197814 |
Kind Code |
A1 |
Cowsert, Lex M. ; et
al. |
October 7, 2004 |
System of components for preparing oligonucleotides
Abstract
Interative, preferably computer based iterative processes for
generating synthetic compounds with desired physical, chemical
and/or bioactive properties, i.e., active compounds, are provided.
During iterations of the processes, a target nucleic acid sequence
is provided or selected, and a library of candidate nucleobase
sequences is generated in silico according to defined criteria. A
"virtual" oligonucleotide chemistry is chosen and a library of
virtual oligonucleotide compounds having the selected nucleobase
sequences is generated. These virtual compounds are reviewed and
compounds predicted to have particular properties are selected. The
selected compounds are robotically synthesized and are preferably
robotically assayed for a desired physical, chemical or biological
activity. Active compounds are thus generated and, at the same
time, preferred sequences and regions of the target nucleic acid
that are amenable to oligonucleotide or sequence-based modulation
are identified.
Inventors: |
Cowsert, Lex M.; (Carlsbad,
CA) ; Baker, Brenda F.; (Carlsbad, CA) ;
McNeil, John; (La Jolla, CA) ; Freier, Susan M.;
(San Diego, CA) ; Sasmor, Henri M.; (Oceanside,
CA) ; Brooks, Douglas G.; (San Marcos, CA) ;
Ohashi, Cara; (San Francisco, CA) ; Wyatt, Jacqueline
R.; (Encinitas, CA) ; Borchers, Alexander H.;
(Encinitas, CA) ; Vickers, Timothy A.; (Oceanside,
CA) |
Correspondence
Address: |
FENWICK & WEST LLP
SILICON VALLEY CENTER
801 CALIFORNIA STREET
MOUNTAIN VIEW
CA
94041
US
|
Family ID: |
22077363 |
Appl. No.: |
10/830475 |
Filed: |
April 21, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10830475 |
Apr 21, 2004 |
|
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09067638 |
Apr 28, 1998 |
|
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60081483 |
Apr 13, 1998 |
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Current U.S.
Class: |
435/6.11 ;
702/20 |
Current CPC
Class: |
G16B 30/10 20190201;
G16C 20/60 20190201; G16B 35/00 20190201; G16B 30/00 20190201; G16B
20/00 20190201; G16B 35/20 20190201; B01J 2219/007 20130101; C12Q
1/6811 20130101; C12N 15/1048 20130101 |
Class at
Publication: |
435/006 ;
702/020 |
International
Class: |
C12Q 001/68; G06F
019/00; G01N 033/48; G01N 033/50 |
Claims
We claim:
1. A method for identifying oligonucleotide compounds having
activity against a target, comprising: providing a target sequence;
generating a set of candidate oligonucleotide sequences having a
predetermined length, wherein said set comprises the set of all
sequences having said predetermined length that are complementary
to said target sequence; calculating for said set members at least
one of a thermodynamic property score, a sequence property score,
and a homology property score; retaining within said set members
having said at least one score within a desired score range;
synthesizing said retained set members; and assaying said retained
set members for activity against said target, wherein said assay is
indicative of an amount of an mRNA or a protein encoded by said
target.
2. The method of claim 1, wherein at least one of said generating,
calculating, synthesizing or assaying steps is implemented using a
computer.
3. The method of claim 1, wherein at least 19% of said assayed set
members are not inactive in said assay.
4. The method of claim 3, wherein at least 85% of said assayed set
members are not inactive in said assay.
5. The method of claim 1, wherein said predetermined length is from
about 8 to about 30 nucleobases.
6. The method of claim 5, wherein said predetermined length is from
about 12 to about 25 nucleobases.
7. The method of claim 1, wherein said synthesizing step includes
use of an automated synthesizer comprising a reagent array delivery
format employing motion along a first axis of a matrix of reaction
vessels and motion along a second axis of an array of reagents.
8. The method of claim 1, wherein said thermodynamic property is
selected from the group consisting of a free energy of a target
structure, a free energy of an intramolecular-oligonucleotide
binding interaction, a free energy of an
intermolecular-oligonucleotide binding interaction, a free energy
of duplex formation, a free energy of an oligonucleotide-target
binding, and a free energy of an alternate thermodynamic
property.
9. The method of claim 8, wherein said alternate thermodynamic
property is a predicted oligonucleotide-target melting
temperature.
10. The method of claim 1, wherein said sequence property is
selected from the group consisting of a number of strings of four
G's in a row, a number of strings of three G's in a row, a length
of the longest string of A's, a length of the longest string of
C's, a length of the longest string of U's, a length of the longest
string of T's, a length of the longest string of purines, a length
of the longest string of pyrimidines, a percent of A's, a percent
of C's, a percent of G's, a percent of U's, a percent of T's, a
percent of purines, a percent of pyrimidines, a number of CG
dinucleotides, a number of CA dinucleotides, a number of UA
dinucleotides, a number of TA dinucleotides, and an alternate
sequence property.
11. The method of claim 1, wherein said homology property is
selected from the group consisting of an homology to a nucleic acid
encoding a protein isoform of said target, an homology to an
analogous target nucleic acid from a species different from the
species from which the target sequence originated, an homology to a
splice variant of said target nucleic acid, and an alternate
homology property.
12. The method of claim 1, further comprising the step of selecting
for synthesis a subset of retained set members targeted to a
functional region of said target sequence.
13. The method of claim 12, wherein said functional region is
selected from the group consisting of a transcription start site, a
5' cap; a start codon, a coding region, a stop codon, a
3'untranslated region, a 5' splice site, a 3' splice site, an exon,
an intron, an mRNA stabilization signal, an mRNA destabilization
signal, a poly-adenylation signal, a poly-A addition site, a poly-A
tail, a gene sequence 5' of said target pre-mRNA, and an alternate
secondary structure property.
14. The method of claim 1, further comprising the step of selecting
for synthesis a subset of retained set members that are uniformly
distributed across said target sequence.
15. The method of claim 1, further comprising the step of making a
quality control measurement on said synthesized retained set
members.
16. The method of claim 15, wherein said measurement comprises
quantitating an amount of oligonucleotide, determining a percent of
total oligonucleotide that is full-length, or determining a mass of
total oligonucleotide that is full length.
17. The method of claim 16, wherein said measurement comprises a
technique selected from the group consisting of ultraviolet
spectroscopy, capillary gel electrophoresis, and mass
spectroscopy.
18. The method of claim 15, further comprising assigning a quality
control grade to said synthesized retained set members.
19. The method of claim 18, further comprising re-synthesizing said
retained set members if said quality control grade is not a passing
grade.
20. The method of claim 1, further comprising the step of searching
a nucleic acid sequence database and selecting for synthesis a
subset of retained set members that are not found within said
database.
21. The method of claim 1, wherein said provided target sequence is
selected based on a criterion selected from the group consisting of
a quantity of available target nucleotide sequence, a quality of
available target nucleotide sequence, an availability of a
culturable cell line expressing said target sequence, an
availability of a source of reproducible genetic expression of said
target, and an association of said target sequence with a
disease.
22. The method of claim 1, further comprising synthesizing a second
retained set wherein said retained set members and said second
retained set members differ with respect to an oligonucleotide
chemistry, and assaying said second retained set members for
activity against said target, wherein said assay is indicative of
an amount of an mRNA or a protein encoded by said target.
23. A method of identifying a target sequence region amenable to
oligonucleotide-based modulation, comprising carrying out the
method of claim 1 or claim 22, and assembling a contig of reverse
complements of said retained set member sequences that are active
in said assay.
24. The method of claim 23, wherein said oligonucleotide-based
modulation is selected from the group consisting of
antisense-mediated modulation, RNAi-mediated modulation, and
ribozyme-mediated modulation.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application is a continuation of U.S. Ser. No.
application 09/067,638, filed on Apr. 28, 1998, which claims
priority from U.S. application Ser. No. 60/081,483, filed on Apr.
13, 1998, the disclosures of which each are herein incorporated by
reference in their entireties.
FIELD OF THE INVENTION
[0002] The present invention relates generally to the generation of
synthetic compounds having defined physical, chemical or bioactive
properties. More particularly, the present invention relates to the
automated generation of oligonucleotide compounds targeted to a
given nucleic acid sequence via computer-based, iterative robotic
synthesis of synthetic oligonucleotide compounds and robotic or
robot-assisted analysis of the activities of such compounds.
Information gathered from assays of such compounds is used to
identify nucleic acid sequences that are tractable to a variety of
nucleotide sequence-based technologies, for example, antisense drug
discovery and target validation.
BACKGROUND OF THE INVENTION
1. Oligonucleotide Technology
[0003] Synthetic oligonucleotides of complementarity to targets are
known to hybridize with particular, target nucleic acids. In one
example, compounds complementary to the `sense` strand of nucleic
acids that encode polypeptides, are referred to as "antisense
oligonucleotides." A subset of such compounds may be capable of
modulating the expression of target nucleic acid in vivo; such
synthetic compounds are described herein as "active oligonucleotide
compounds."
[0004] Oligonucleotide compounds are also commonly used in vitro as
research reagents and diagnostic aids, and in vivo as therapeutic
and bioactive agents. Oligonucleotide compounds can exert their
effect by a variety of means. One such means is the
antisense-mediated use of an endogenous nuclease, such as RNase H
in eukaryotes or RNase P in prokaryotes, to the target nucleic acid
(Chiang et al., J. Biol. Chem., 1991, 266, 18162; Forster et al.,
Science, 1990, 249, 783). Another means involves covalently linking
of a synthetic moiety having nuclease activity to an
oligonucleotide having an antisense sequence. This does not rely
upon recruitment of an endogenous nuclease to modulate target
activity. Synthetic moieties having nuclease activity include, but
are not limited to, enzymatic RNAs, lanthanide ion complexes, and
other reactions species. (Haseloffet al., Nature, 1988, 334, 585;
Baker et al., J. Am. Chem. Soc., 1997, 119, 8749).
[0005] Despite the advances made in utilizing antisense technology
to date, it is still common to identify sequences amenable to
antisense technologies through an empirical approach (Szoka, Nature
Biotechnology, 1997, 15, 509). Accordingly, the need exists for
systems and methods for efficiently and effectively identifying
target nucleotide sequences that are suitable for antisense
modulation. The present disclosure answers this need by providing
systems and methods for automatically identifying such sequences
via in silico, robotic or other automated means.
2. Identification of Active Oligonucleotide Compounds
[0006] Traditionally, new chemical entities with useful properties
are generated by (1) identifying a chemical compound (called a
`lead compound`) with some desirable property or activity, (2)
creating variants of the lead compound, and (3) evaluating the
property and activity of such variant compounds. The process has
been called `SAR`, i.e., structure activity relationship. Although
`SAR` and its hand-maiden, rational drug design, has been utilized
with some degree of success, there are a number of limitations to
these approaches to lead compound generation, particularly as it
pertains to the discovery of bioactive oligonucleotide compounds.
In attempting to use SAR with oligonucleotides, it has been
recognized that RNA structure can inhibit duplex formation with
antisense compounds, so much so that "moving" the target nucleotide
sequence even a few bases can drastically decrease the activity of
such compounds (Lima et al., Biochemistry, 1992, 31, 12055).
[0007] Heretofore, the search for lead antisense compounds has been
limited to the manual synthesis and analysis of such compounds.
Consequently, a fundamental limitation of the conventional approach
is its dependence upon the availability, number and cost of
antisense compounds produced by manual, or at best semi-automated,
means. Moreover, the assaying of such compounds has traditionally
been performed by tedious manual techniques. Thus, the traditional
approach to generating active antisense compounds is limited by the
relatively high cost and long time required to synthesize and
screen a relatively small number of candidate antisense
compounds.
[0008] Accordingly, the need exists for systems and methods for
efficiently and effectively generating new active antisense and
other olgonucleotide compounds targeted to specific nucleic acid
sequences. The present disclosure answers this need by providing
systems and methods for automatically generating active antisense
compounds via robotic and other automated means.
3. Gene Function Analysis
[0009] Efforts such as the Human Genome Project are making an
enormous amount of nucleotide sequence information available in a
variety of forms, e.g., genomic sequences, cDNAs, expressed
sequence tags (ESTs) and the like. This explosion of information
has led one commentator to state that `genome scientists are
producing more genes than they can put a function to` (Kahn,
Science, 1995, 270, 369). Although some approaches to this problem
have been suggested, no solution has yet emerged. For example,
methods of looking at gene expression in different disease states
or stages of development only provide, at best, an association
between a gene and a disease or stage of development (Nowak,
Science, 1995, 270, 368). Another approach, looking at the proteins
encoded by genes, is developing but `this approach is more complex
and big obstacles remain` (Kahn, Science, 1995, 270, 369).
Furthermore, neither of these approaches allows one to directly
utilize nucleotide sequence information to perform gene function
analysis.
[0010] In contrast, antisense technology does allow for the direct
utilization of nucleotide sequence information for gene function
analysis. Once a target nucleic acid sequence has been selected,
antisense sequences hybridizable to the sequence can be generated
using techniques known in the art. Typically, a large number of
candidate antisense oligonucleotides (ASOs) are synthesized having
sequences that are more-or-less randomly spaced across the length
of the target nucleic acid sequence (e.g., a `gene walk`) and their
ability to modulate the expression of the target nucleic acid is
assayed. Cells or animals can then be treated with one or more
active antisense oligonucleotides, and the resulting effects
determined in order to determine the function(s) of the target
gene. Although the practicality and value of this empirical
approach to developing active antisense compounds has been
acknowledged in the art, it has also been stated that this approach
`is beyond the means of most laboratories and is not feasible when
a new gene sequence is identified, but whose function and
therapeutic potential are unknown` (Szoka, Nature Biotechnology,
1997, 15, 509).
[0011] Accordingly, the need exists for systems and methods for
efficiently and effectively determining the function of a gene that
is uncharacterized except that its nucleotide sequence, or a
portion thereof, is known. The present disclosure answers this need
by providing systems and methods for automatically generating
active antisense compounds to a target nucleotide sequence via
robotic means. Such active antisense compounds are contacted with
cells, cell-free extracts, tissues or animals capable of expressing
the gene of interest and subsequent biochemical or biological
parameters are measured. The results are compared to those obtained
from a control cell culture, cell-free extract, tissue or animal
which has not been contacted with an active antisense compound in
order to determine the function of the gene of interest.
4. Target Validation
[0012] Determining the nucleotide sequence of a gene is no longer
an end unto itself; rather, it is `merely a means to an end. The
critical next step is to validate the gene and its [gene] product
as a potential drug target` (Glasser, Genetic Engineering News,
1997, 17, 1). This process, i.e., confirming that modulation of a
gene that is suspected of being involved in a disease or disorder
actually results in an effect that is consistent with a causal
relationship between the gene and the disease or disorder, is known
as target validation.
[0013] Efforts such as the Human Genome Project are yielding a vast
number of complete or partial nucleotide sequences, many of which
might correspond to or encode targets useful for new drug discovery
efforts. The challenge represented by this plethora of information
is how to use such nucleotide sequences to identify and rank valid
targets for drug discovery. Antisense technology provides one means
by which this might be accomplished; however, the many manual,
labor-intensive and costly steps involved in traditional methods of
developing active antisense compounds has limited their use in
target validation (Szoka, Nature Biotechnology, 1997, 15, 509).
Nevertheless, the great target specificity that is characteristic
of antisense compounds makes them ideal choices for target
validation, especially when the functional roles of proteins that
are highly related are being investigated (Albert et al., Trends in
Pharm. Sci., 1994, 15, 250).
[0014] Accordingly, the need exists for systems and methods for
developing compounds efficiently and effectively that modulate a
gene, wherein such compounds can be directly developed from
nucleotide sequence information. Such compounds are needed to
confirm that modulation of a gene that is thought to be involved in
a disease or disorder will in fact cause an in vitro or in vivo
effect indicative of the origin, development, spread or growth of
the disease or disorder.
[0015] The present disclosure answers this need by providing
systems and methods for automatically generating active
oligonucleotide and other compounds, especially anti-sense
compounds, to a target nucleotide sequence via robotic or other
automated means. Such active compounds are contacted with a cell
culture, cell-free extract, tissue or animal capable of expressing
the gene of interest, and subsequent biochemical or biological
parameters indicative of the origin, development, spread or growth
of the disease or disorder are measured. These results are compared
to those obtained with a control cell system, cell-free extract,
tissue or animal which has not been contacted with an active
antisense compound in order to determine whether or not modulation
of the gene of interest will have a therapeutic benefit or not. The
resulting active antisense compounds may be used as positive
controls when other, non antisense-based agents directed to the
same target nucleic acid, or to its gene product, are screened.
[0016] It should be noted that embodiments of the invention drawn
to gene function analysis and target validation have parameters
that are shared with other embodiments of the invention, but also
have unique parameters. For example, antisense drug discovery
naturally requires that the toxicity of the antisense compounds be
manageable, whereas, for gene function analysis or target
validation, overt toxicity resulting from the antisense compounds
is acceptable unless it interferes with the assay being used to
evaluate the effects of treatment with such compounds.
[0017] U.S. Pat. No. 5,563,036 to Peterson et al. describes systems
and methods of screening for compounds that inhibit the binding of
a transcription factor to a nucleic acid. In a preferred
embodiment, an assay portion of the process is stated to be
performed by a computer controlled robot.
[0018] U.S. Pat. No. 5,708,158 to Hoey describes systems and
methods for identifying pharmacological agents stated to be useful
for diagnosing or treating a disease associated with a gene the
expression of which is modulated by a human nuclear factor of
activated T cells. The methods are stated to be particularly suited
to high-thoughput screening wherein one or more steps of the
process are performed by a computer controlled robot.
[0019] U.S. Pat. Nos. 5,693,463 and 5,716,780 to Edwards et al.
describe systems and methods for identifying non-oligonucleotide
molecules that specifically bind to a DNA molecule based on their
ability to compete with a DNA-binding protein that recognizes the
DNA molecule.
SUMMARY OF THE INVENTION
[0020] The present invention is directed to automated systems and
methods for generating active oligonucleotide compounds, i.e.,
those having desired physical, chemical and/or biological
properties. The present invention is also directed to
oligonucleotide-sensitive target sequences identified, by the
systems and methods. For purposes of illustration, the present
invention is described herein with respect to the production of
antisense oligonucleotides; however, the present invention is not
limited to this embodiment.
[0021] The present invention is directed to iterative processes for
generating new chemical compounds with prescribed sets of physical,
chemical and/or biological properties, and to systems for
implementing these processes. During each iteration of a process as
contemplated herein, a target nucleic acid sequence is provided or
selected, and a library of (candidate) nucleobase sequences is
generated in silico (that is in a computer manipulatible and
reliable form) according to defined criteria a virtual
oligonucleotide chemistry is chosen. A library of virtual
oligonucleotide compounds having the desired nucleobase sequences
is generated. These virtual compounds are reviewed and compounds
predicted to have particular desired properties are selected. The
selected compounds are synthesized, preferably in a robotic,
batchwise manner; and then they are robotically assayed for a
desired physical, chemical or biological activity in order to
identify compounds with the desired properties. Active compounds
are, thus, generated and, at the same time, preferred sequences and
regions of the target nucleic acid that are amenable to modulation
are identified.
[0022] In subsequent iterations of the process, second libraries of
candidate nucleobase sequences are generated and/or selected to
give rise to a second virtual oligonucleotide library. Through
multiple iterations of the process, a library of target nucleic
acid sequences that are tractable to oligonucleotide technologies
are identified. Such modulation includes, but is not limited to,
antisense technology, gene function analysis and target
validation.
[0023] Further features and advantages of the present invention, as
well as the structure and operation of various embodiments of the
present invention, are described in detail below with reference to
the accompanying drawings. In the drawings, like reference numbers
indicate identical or functionally similar elements.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The present invention will be described with reference to
the accompanying drawings, wherein:
[0025] FIGS. 1 and 2 are a flow diagram of one method according to
the present invention depicting the overall flow of data and
materials among various elements of the invention.
[0026] FIG. 3 is a flow diagram depicting the flow of data and
materials among elements of step 200 of FIG. 1.
[0027] FIGS. 4 and 5 are a flow diagram depicting the flow of data
and materials among elements of step 300 of FIG. 1.
[0028] FIG. 6 is a flow diagram depicting the flow of data and
materials among elements of step 306 of FIG. 4.
[0029] FIG. 7 is another flow diagram depicting the flow of data
and materials among elements of step 306 of FIG. 4.
[0030] FIG. 8 is a another flow diagram depicting the flow of data
and materials among elements of step 306 of FIG. 4.
[0031] FIG. 9 is a flow diagram depicting the flow of data and
materials among elements of step 350 of FIG. 5.
[0032] FIGS. 10 and 11 are flow diagrams depicting a logical
analysis of data and materials among elements of step 400 of FIG.
1.
[0033] FIG. 12 is a flow diagram depicting the flow of data and
materials among the elements of step 400 of FIG. 1.
[0034] FIGS. 13 and 14 are flow diagrams depicting the flow of data
and materials among elements of step 500 of FIG. 1.
[0035] FIG. 15 is a flow diagram depicting the flow of data and
materials among elements of step 600 of FIG. 1.
[0036] FIG. 16 is a flow diagram depicting the flow of data and
materials among elements of step 700 of FIG. 1.
[0037] FIG. 17 is a flow diagram depicting the flow of data and
materials among the elements of step 1100 of FIG. 2.
[0038] FIG. 18 is a block diagram showing the interconnecting of
certain devices utilized in conjunction with a preferred method of
the invention;
[0039] FIG. 19 is a flow diagram showing a representation of data
storage in a relational database utilized in conjunction with one
method of the invention;
[0040] FIG. 20 is a flow diagram depicting the flow of date and
materials in effecting a preferred embodiment of the invention as
set forth in Example 14;
[0041] FIG. 21 is a flow diagram depicting the depicting the flow
of date and materials in effecting a preferred embodiment of the
invention as set forth in Example 15;
[0042] FIG. 22 is a flow diagram depicting the depicting the flow
of date and materials in effecting a preferred embodiment of the
invention as set forth in Example 2;
[0043] FIG. 23 is a pictorial elevation view of a preferred
apparatus used to robotically synthesize oligonucleotides; and
[0044] FIG. 24 is a pictorial plan view of an apparatus used to
robotically synthesize oligonucleotides.
[0045] Certain preferred methods of this invention are now
described with reference to the flow diagram of FIGS. 1 and 2.
1. Target Nucleic Acid Selection
[0046] The target selection process, process step 100, provides a
target nucleotide sequence that is used to help guide subsequent
steps of the process. It is generally desired to modulate the
expression of the target nucleic acid for any of a variety of
purposes, such as, e.g., drug discovery, target validation and/or
gene function analysis.
[0047] One of the primary objectives of the target selection
process, step 100, is to identify molecular targets that represent
significant therapeutic opportunities, provide new medicines to the
medical community to fill therapeutic voids or improve upon
existing therapies, to provide new and efficacious means of drug
discovery and to determine the function of genes that are
uncharacterized except for nucleotide sequence. To meet these
objectives, genes are classified based upon specific sets of
selection criteria.
[0048] One such set of selection criteria concerns the quantity and
quality of target nucleotide sequence. There must be sufficient
target nucleic acid sequence information available for
oligonucleotide design. Moreover, such information must be of
sufficient quality to give rise to an acceptable level of
confidence in the data to perform the methods described herein.
Thus, the data must not containing too many missing or incorrect
base entries. In the case of a target sequence that encodes a
polypeptide, such errors can be detected by virtually translating
all three reading frames of the sense strand of the target sequence
and confirming the presence of a continuous polypeptide sequence
having predictable attributes, e.g., encoding a polypeptide of
known size, or encoding a polypeptide that is about the same length
as a homologous protein. In any event, only a very high frequency
of sequence errors will frustrate the methods of the invention;
most oligonucleotides to the target sequence will avoid such errors
unless such errors occur frequently throughout the entire target
sequence
[0049] Another preferred criterion is that appropriate culturable
cell lines or other source of reproducible genetic expression
should be available. Such cell lines express, or can be induced to
express, the gene comprising the target nucleic acid sequence. The
oligonucleotide compounds generated by the process of the invention
are assayed using such cell lines and, if such assaying is
performed robotically, the cell line is preferably tractable to
robotic manipulation such as by growth in 96 well plates. Those
skilled in the art will recognize that if an appropriate cell line
does not exist, it will nevertheless be possible to construct an
appropriate cell line. For example, a cell line can be transfected
with an expression vector comprising the target gene in order to
generate an appropriate cell line for assay purposes.
[0050] For gene function analysis, it is possible to operate upon a
genetic system having a lack of information regarding, or
incomplete characterization of, the biological function(s) of the
target nucleic acid or its gene product(s). This is a powerful
agent of the invention. A target nucleic acid for gene function
analysis might be absolutely uncharacterized, or might be thought
to have a function based on minimal data or homology to another
gene. By application of the process of the invention to such a
target, active compounds that modulate the expression of the gene
can be developed and applied to cells. The resulting cellular,
biochemical or molecular biological responses are observed, and
this information is used by those skilled in the art to elucidate
the function of the target gene.
[0051] For target validation and drug discovery, another selection
criterion is disease association. Candidate target genes are placed
into one of several broad categories of known or deduced disease
association. Level 1 Targets are target nucleic acids for which
there is a strong correlation with disease. This correlation can
come from multiple scientific disciplines including, but not
limited to, epidemiology, wherein frequencies of gene abnormalities
are associated with disease incidence; molecular biology, wherein
gene expression and function are associated with cellular events
correlated with a disease; and biochemistry, wherein the in vitro
activities of a gene product are associated with disease
parameters. Because there is a strong therapeutic rationale for
focusing on Level 1 Targets, these targets are most preferred for
drug discovery and/or target validation.
[0052] Level 2 Targets are nucleic acid targets for which the
combined epidemiological, molecular biological, and/or biochemical
correlation with disease is not so clear as for Level 1. Level 3
Targets are targets for which there is little or no data to
directly link the target with a disease process, but there is
indirect evidence for such a link, i.e., homology with a Level 1 or
Level 2 target nucleic acid.
[0053] One such set of selection criteria concerns the quantity and
quality of target nucleotide sequence. There must be sufficient
target nucleic acid sequence information available for
oligonucleotide design. Moreover, such information must be of
sufficient quality to give rise to an acceptable level of
confidence in the data to perform the methods described herein.
Thus, the data must not containing too many missing or incorrect
base entries. In the case of a target sequence that encodes a
polypeptide, such errors can be detected by virtually translating
all three reading frames of the sense strand of the target sequence
and confirming the presence of a continuous polypeptide sequence
having predictable attributes, e.g., encoding a polypeptide of
known size, or encoding a polypeptide that is about the same length
as a homologous protein. In any event, only a very high frequency
of sequence errors will frustrate the methods of the invention;
most oligonucleotides to the target sequence will avoid such errors
unless such errors occur frequently throughout the entire target
sequence.
[0054] Another preferred criterion is that appropriate culturable
cell lines or other source of reproducible genetic expression
should be available. Such cell lines express, or can be induced to
express, the gene comprising the target nucleic acid sequence. The
oligonucleotide compounds generated by the process of the invention
are assayed using such cell lines and, if such assaying is
performed robotically, the cell line is preferably tractable to
robotic manipulation such as by growth in 96 well plates. Those
skilled in the art will recognize that if an appropriate cell line
does not exist, it will nevertheless be possible to construct an
appropriate cell line. For example, a cell line can be transfected
with an expression vector comprising the target gene in order to
generate an appropriate cell line for assay purposes.
[0055] For gene function analysis, it is I-ossible to operate
sequence or with the gene product thereof. In order not to
prejudice the target selection process, and to ensure that the
maximum number of nucleic acids actually involved in the causation,
potentiation, aggravation, spread, continuance or after-effects of
disease states are investigated, it is preferred to examine a
balanced mix of Level 1, 2 and 3 target nucleic acids.
[0056] In order to carry out drug discovery, experimental systems
and reagents shall be available in order for one to evaluate the
therapeutic potential of active compounds generated by the process
of the invention. Such systems may be operable in vitro (e.g., in
vitro models of cell:cell association) or in vivo (e.g., animal
models of disease states). It is also desirable, but not
obligatory, to have available animal model systems which can be
used to evaluate drug pharmacology.
[0057] Candidate targets nucleic acids can also classified by
biological processes. For example, programmed cell death
(`apoptosis`) has recently emerged as an important biological
process that is perturbed in a wide variety of diseases.
Accordingly, nucleic acids that encode factors that play a role in
the apoptotic process are identified as candidate targets.
Similarly, potential target nucleic acids can be classified as
being involved in inflammation, autoimmune disorders, cancer, or
other pathological or dysfunctional processes.
[0058] Moreover, genes can often be grouped into families based on
sequence homology and biological function. Individual family
members can act redundantly, or can provide specificity through
diversity of interactions with down-stream effectors, or through
expression being restricted to specific cell types. When one member
of a gene family is associated with a disease process then the
rationale for targeting other members of the same family is
reasonably strong. Therefore, members of such gene families are
preferred target nucleic acids to which the methods and systems of
the invention may be applied. Indeed, the potent specificity of
antisense compounds for different gene family members makes the
invention particularly suited for such targets (Albert et al.,
Trends Pharm. Sci., 1994, 15, 250). Those skilled in the art will
recognize that a partial or complete nucleotide sequence of such
family members can be obtained using the polymerase chain reaction
(PCR) and `universal` primers, i.e., primers designed to be common
to all members of a given gene family.
[0059] PCR products generated from universal primers can be cloned
and sequenced or directly sequenced using techniques known in the
art. Thus, although nucleotide sequences from cloned DNAs, or from
complementary DNAs (cDNAs) derived from mRNAs, may be used in the
process of the invention, there is no requirement that the target
nucleotide sequence be isolated from a cloned nucleic acid. Any
nucleotide sequence, no matter how determined, of any nucleic acid,
isolated or prepared in any fashion, may be used as a target
nucleic acid in the process of the invention.
[0060] Furthermore, although polypeptide-encoding nucleic acids
provide the target nucleotide sequences in one embodiment of the
invention, other nucleic acids may be targeted as well. Thus, for
example, the nucleotide sequences of structural or enzymatic RNAs
may be utilized for drug discovery and/or target validation when
such RNAs are associated with a disease state, or for gene function
analysis when their biological role is not known.
2. Assembly of Target Nucleotide Sequence
[0061] FIG. 3 is a block diagram detailing the steps of the target
nucleotide sequence assembly process, process step 200 in
accordance with one embodiment of the invention. The
oligonucleotide design process, process step 300, is facilitated by
the availability of accurate target sequence information. Because
of limitations of automated genome sequencing technology, gene
sequences are often accumulated in fragments. Further, because
individual genes are often being sequenced by independent
laboratories using different sequencing strategies, sequence
information corresponding to different fragments is often deposited
in different databases. The target nucleic acid assembly process
take advantage of computerized homology search algorithms and
sequence fragment assembly algorithms to search available databases
for related sequence information and incorporate available sequence
information into the best possible representation of the target
nucleic acid molecule, for example a RNA transcript. This
representation is then used to design oligonucleotides, process
step 300, which can be tested for biological activity in process
step 700.
[0062] In the case of genes directing the synthesis of multiple
transcripts, i.e. by alternative splicing, each distinct transcript
is a unique target nucleic acid for purposes of step 300. In one
embodiment of the invention, if active compounds specific for a
given transcript isoform are desired, the target nucleotide
sequence is limited to those sequences that are unique to that
transcript isoform. In another embodiment of the invention, if it
is desired to modulate two or more transcript isoforms in concert,
the target nucleotide sequence is limited to sequences that are
shared between the two or more transcripts.
[0063] In the case of a polypeptide-encoding nucleic acid, it is
generally preferred that full-length cDNA be used in the
oligonucleotide design process step 300 (with full-length cDNA
being defined a reading from the 5' cap to the poly A tail).
Although full-length cDNA is preferred, it is possible to design
oligonucleotides using partial sequence information. Therefore it
is not necessary for the assembly process to generate a complete
cDNA sequence. Further in some cases it may be desirable to design
oligonucleotides targeting introns. In this case the process can be
used to identify individual introns at process step 220.
[0064] The process can be initiated by entering initial sequence
information on a selected molecular target at process step 205. In
the case of a polypeptide-encoding nucleic acid, the full-length
cDNA sequence is generally preferred for use in oligonucleotide
design strategies at process step 300. The first step is to
determine if the initial sequence information represents the
full-length cDNA, decision step 210. In the case where the
full-length cDNA sequence is available the process advances
directly to the oligonucleotide design step 300. When the
full-length cDNA sequence is not available, databases are searched
at process step 212 for additional sequence information.
[0065] The algorithm preferably used in process steps 212 and 230
is BLAST (Altschul, et al., J. Mol. Biol., 1990, 215, 403), or
`Gapped BLAST` (Altschul et al., Nucl. Acids Res., 1997, 25, 3389).
These are database search tools based on sequence homology used to
identify related sequences in a sequence database. The BLAST search
parameters are set to only identify closely related sequences. Some
preferred databases searched by BLAST are a combination of public
domain and proprietary databases. The databases, their contents,
and sources are listed in Table 1.
[0066] When genomic sequence information is available at decision
step 215, introns are removed and exons are assembled into
continuous sequence representing the cDNA sequence in process step
220. Exon assembly occurs using the Phragment Assembly Program
`Phrap` (Copyright University of Washington Genome Center, Seattle,
Wash.). The Phrap algorithm analyzes sets of overlapping sequences
and assembles them into one continuous sequence referred to as a
`contig`. The resulting contig is preferably used to search
databases for additional sequence information at process step 230.
When genomic information is not available, the results of process
step 212 are analyzed for individual exons at decision step 225.
Exons are frequently recorded individually in databases. If
multiple complete exons are identified, they are preferably
assembled into a contig using Phrap at process step 250. If
multiple complete exons are not identified at decision step 225,
then sequences can be analyzed for partial sequence information in
decision step 228. ESTs identified in the database dbEST are
examples of such partial sequence information. If additional
partial information is not found, then the process is advanced to
process step 230 at decision step 228. If partial sequence
information is found in process 212 then that information is
advanced to process step 230 via decision step 228.
[0067] Process steps 230, decision steps 240, decision steps 260
and process steps 250 define a loop designed to extend iteratively
the amount of sequence information available for targeting. At the
end of each iteration of this loop, the results are analyzed in
decision steps 240 and 260. If no new information is found then the
process advances at decision steps 240 to process step 300. If
there is an unexpectedly large amount of sequence information
identified, then the process is preferably cycled back one
iteration and that sequence is advanced at decision steps 240 to
process step 300. If a small amount of new sequence information is
identified, then the loop is iterated such as by taking the 100
most 5-prime (5') and 100 most 3-prime (3') bases and interating
them through the BLAST homology search at process step 230. New
sequence information is added to the existing contig at process
step 250.
[0068] This loop is iterated until either no new sequence
information is identified at decision steps 240, or an unexpectedly
large amount of new information is found at decision step 260,
suggesting that the process moved outside the boundary of the gene
into repetitive genomic sequence. In either of these cases,
iteration of this loop is preferably stopped and the process
advanced to the oligonucleotide design at process step 300.
3. In Silico Generation of a Set of Nucleobase Sequences and
Virtual Oligonucleotides
[0069] For the following steps 300 and 400, they may be performed
in the order described below, i.e., step 300 before step 400, or,
in an alternative embodiment of the invention, step 400 before step
300. In this alternate embodiment, each oligonucleotide chemistry
is first assigned to each oligonucleotide sequence. Then, each
combination of oligonucleotide chemistry and sequence is evaluated
according to the parameters of step 300. This embodiment has the
desirable feature of taking into account the effect of alternative
oligonucleotide chemistries on such parameters. For example,
substitution of 5-methyl cytosine (5MeC or m5c) for cytosine in an
antisense compound may enhance the stability of a duplex formed
between that compound and its target nucleic acid. Other
oligonucleotide chemistries that enhance oligonucleotide:[target
nucleic acid] duplexes are known in the art (see for example,
Freier et al., NucleicAcids Research, 1997, 25, 4429). As will be
appreciated by those skilled in the art, different oligonucleotide
chemistries may be preferred for different target nucleic acids.
That is, the optimal oligonucleotide chemistry for binding to a
target DNA might be suboptimal for binding to a target RNA having
the same nucleotide sequence.
[0070] In effecting the process of the invention in the order step
300 before step 400 as seen in FIG. 1, from a target nucleic acid
sequence assembled at step 200, a list of oligonucleotide sequences
is generated as represented in the flowchart shown in FIGS. 4 and
5. In step 302, the desired oligonucleotide length is chosen. In a
preferred embodiment, oligonucleotide length is between from about
8 to about 30, more preferably from about 12 to about 25,
nucleotides. In step 304, all possible oligonucleotide sequences of
the desired length capable of hybridizing to the target sequence
obtained in step 200 are generated. In this step, a series of
oligonucleotide sequences are generated, simply by determining the
most 5' oligonucleotide possible and `walking` the target sequence
in increments of one base until the 3' most oligonucleotide
possible is reached.
[0071] In step 305, a virtual oligonucleotide chemistry is applied
to the nucleobase sequences of step 304 in order to yield a set of
virtual oligonucleotides that can be evaluated in silico. Default
virtual oligonucleotide chemistries include those that are
well-characterized in terms of their physical and chemical
properties, e.g., 2'-deoxyribonucleic acid having naturally
occurring bases (A, T, C and G), unmodified sugar residues and a
phosphodiester backbone.
4. In Silico Evaluation of Thermodynamic Properties of Virtual
Oligonucleotides
[0072] In step 306, a series of thermodynamic, sequence, and
homology scores are preferably calculated for each virtual
oligonucleotide obtained from step 305. Thermodynamic properties
are calculated as represented in FIG. 6. In step 308, the desired
thermodynamic properties are selected. This will typically include
step 309, calculation of the free energy of the target structure.
If the oligonucleotide is a DNA molecule, then steps 310, 312, and
314 are performed. If the oligonucleotide is an RNA molecule, then
steps 311, 313 and 315 are performed. In both cases, these steps
correspond to calculation of the free energy of intramolecular
oligonucleotide interactions, intermolecular interactions and
duplex formation. In addition, a free energy of
oligonucleotide-target binding is preferably calculated at step
316.
[0073] Other thermodynamic and kinetic properties may be calculated
for oligonucleotides as represented at step 317. Such other
thermodynamic and kinetic properties may include melting
temperatures, association rates, dissociation rates, or any other
physical property that may be predictive of oligonucleotide
activity.
[0074] The free energy of the target structure is defined as the
free energy needed to disrupt any secondary structure in the target
binding site of the targeted nucleic acid. This region includes any
intra-target nucleotide base pairs that need to be disrupted in
order for an oligonucleotide to bind to its complementary sequence.
The effect of this localized disruption of secondary structure is
to provide accessibility by the oligonucleotide. Such structures
will include double helices, terminal unpaired and mismatched
nucleotides, loops, including hairpin loops, bulge loops, internal
loops and multibranch loops (Serra et al., Methods in Enzymology,
1995, 259, 242).
[0075] The intermolecular free energies refer to inherent energy
due to the most stable structure formed by two oligonucleotides;
such structures include dimer formation. Intermolecular free
energies should also be taken into account when, for example, two
or more oligonucleotides, of different sequence are to be
administered to the same cell in an assay.
[0076] The intramolecular free energies refer to the energy needed
to disrupt the most stable secondary structure within a single
oligonucleotide. Such structures include, for example, hairpin
loops, bulges and internal loops. The degree of intramolecular base
pairing is indicative of the energy needed to disrupt such base
pairing.
[0077] The free energy of duplex formation is the free energy of
denatured oligonucleotide binding to its denatured target sequence.
The oligonucleotide-target binding is the total binding involved,
and includes the energies involved in opening up intra- and
inter-molecular oligonucleotide structures, opening up target
structure, and duplex formation.
[0078] The most stable RNA structure is predicted based on nearest
neighbor analysis (Serra et al., Methods in Enzymology, 1995, 259,
242). This analysis is based on the assumption that stability of a
given base pair is determined by the adjacent base pairs. For each
possible nearest neighbor combination, thermodynamic properties
have been determined and are provided. For double helical regions,
two additional factors need to be considered, an entropy change
required to initiate a helix and a entropy change associated with
self-complementary strands only. Thus, the free energy of a duplex
can be calculated using the equation:
.DELTA.G.degree..sub.T=.DELTA.H.degree.-T.DELTA.S.degree.
[0079] where:
[0080] .DELTA.G is the free energy of duplex formation,
[0081] .DELTA.H is the enthalpy change for each nearest
neighbor,
[0082] .DELTA.S is the entropy change for each nearest neighbor,
and T is temperature.
[0083] The .DELTA.H and .DELTA.S for each possible nearest neighbor
combination have been experimentally determined. These letter
values are often available in published tables. For terminal
unpaired and mismatched nucleotides, enthalpy and entropy
measurements for each possible nucleotide combination are also
available in published tables. Such results are added directly to
values determined for duplex formation. For loops, while the
available data is not as complete or accurate as for base pairing,
one known model determines the free energy of loop formation as the
sum of free energy based on loop size, the closing base pair, the
interactions between the first mismatch of the loop with the
closing base pair, and additional factors including being closed by
AU or UA or a first mismatch of GA or UU. Such equations may also
be used for oligoribonucleotide-target RNA interactions.
[0084] The stability of DNA duplexes is used in the case of intra-
or intermolecular oligodeoxyribonucleotide interactions. DNA duplex
stability is calculated using similar equations as RNA stability,
except experimentally deter-mined values differ between nearest
neighbors in DNA and RNA and helix initiation tends to be more
favorable in DNA than in RNA (SantaLucia et al., Biochemistry,
1996, 35, 3555).
[0085] Additional thermodynamic parameters are used in the case of
RNA/DNA hybrid duplexes. This would be the case for an RNA target
and oligodeoxynucleotide. Such parameters were determined by
Sugimoto et al. (Biochemistry, 1995, 34, 11211). In addition to
values for nearest neighbors, differences were seen for values for
enthalpy of helix initiation.
5. In Silico Evaluation of Target Accessibility
[0086] Target accessibility is believed to be an important
consideration in selecting oligonucleotides. Such a target site
will possess minimal secondary structure and thus, will require
minimal energy to disrupt such structure. In addition, secondary
structure in oligonucleotides, whether inter- or intra-molecular,
is undesirable due to the energy required to disrupt such
structures. Oligonucleotide-target binding is dependent on both
these factors. It is desirable to minimize the contributions of
secondary structure based on these factors. The other contribution
to oligonucleotide-target binding is binding affinity. Favorable
binding affinities based on tighter base pairing at the target site
is desirable.
[0087] Following the calculation of thermodynamic properties ending
at step 317, the desired sequence properties to be scored are
selected at step 324. These properties include the number of
strings of four guanosine residues in a row at step 325) or three
guanosines in a row at step 326), the length of the longest string
of adenosines at step 327), cytidines at step 328) or uridines or
thymidines at step 329), the length of the longest string of
purines at step 330) or pyrimidines at step 331), the percent
composition of adenosine at step 332), cytidine at step 333),
guanosine at step 334) or uridines or thymidines at step 335, the
percent composition of purines at step 336) or pyrimidines at step
337), the number of CG dinucleotide repeats at step 338), CA
dinucleotide repeats at step 339) or UA or TA dinucleotide repeats
at step 340). In addition, other sequence properties may be used as
found to be relevant and predictive of antisense efficacy, as
represented at step 341.
[0088] These sequence properties may be important in predicting
oligonucleotide activity, or lack thereof. For example, U.S. Pat.
No. 5,523,389 discloses oligonucleotides containing stretches of
three or four guanosine residues in a row. Oligonucleotides having
such sequences may act in a sequence-independent manner. For an
antisense approach, such a mechanism is not usually desired. In
addition, high numbers of dinucleotide repeats may be indicative of
low complexity regions which may be present in large numbers of
unrelated genes. Unequal base composition, for example, 90%
adenosine, can also give non-specific effects. From a practical
standpoint, it may be desirable to remove oligonucleotides that
possess long stretches of other nucleotides due to synthesis
considerations. Other sequences properties, either listed above or
later found to be of predictive value may be used to select
oligonucleotide sequences.
[0089] Following step 341, the homology scores to be calculated are
selected in step 342. Homology to nucleic acids encoding protein
isoforms of the target, as represented at step 343, may be desired.
For example, oligonucleotides specific for an isoform of protein
kinase C can be selected. Also, oligonucleotides can be selected to
target multiple isoforms of such genes. Homology to analogous
target sequences, as represented at step 344, may also be desired.
For example, an oligonucleotide can be selected to a region common
to both humans and mice to facilitate testing of the
oligonucleotide in both species. Homology to splice variants of the
target nucleic acid, as represented at step 345, may be desired. In
addition, it may be desirable to determine homology to other
sequence variants as necessary, as represented in step 346.
[0090] Following step 346, from which scores were obtained in each
selected parameter, a desired range is selected to select the most
promising oligonucleotides, as represented at step 347. Typically,
only several parameters will be used to select oligonucleotide
sequences. As structure prediction improves, additional parameters
may be used. Once the desired score ranges are chosen, a list of
all oligonucleotides having parameters falling within those ranges
will be generated, as represented at step 348.
6. Targeting Oligonucleotides to Functional Regions of a Nucleic
Acid
[0091] It may be desirable to target oligonucleotide sequences to
specific functional regions of the target nucleic acid. A decision
is made whether to target such regions, as represented in decision
step 349. If it is desired to target functional regions then
process step 350 occurs as seen in greater detail in FIG. 9. If it
is not desired then the process proceeds to step 375.
[0092] In step 350, as seen in FIG. 9, the desired functional
regions are selected. Such regions include the transcription start
site or 5' cap at step 353), the 5' untranslated region at step
354), the start codon at step 355, the coding region at step 356),
the stop codon at step 357), the 3' untranslated region at step
358), 5' splice sites at step 359 or 3' splice sites at step 360,
specific exons at step 361) or specific introns at step 362), mRNA
stabilization signal at step 363), mRNA destabilization signal at
step 364), poly-adenylation signal at step 365), poly-A addition
site at step 366), poly-A tail at step 367), or the gene sequence
5' of known pre-mRNA at step 368). In addition, additional
functional sites may be selected, as represented at step 369.
[0093] Many functional regions are important to the proper
processing of the gene and are attractive targets for antisense
approaches. For example, the AUG start codon is commonly targeted
because it is necessary to initiate translation. In addition,
splice sites are thought to be attractive targets because these
regions are important for processing of the mRNA. Other known sites
may be more accessible because of interactions with protein factors
or other regulatory molecules.
[0094] After the desired functional regions are selected and
determined, then a subset of all previously selected
oligonucleotides are selected based on hybridization to only those
desired functional regions, as represented by step 370.
7. Uniform Distribution of Oligonucleotides
[0095] Whether or not targeting functional sites is desired, a
large number of oligonucleotide sequences may result from the
process thus far. In order to reduce the number of oligonucleotide
sequences to a manageable number, a decision is made whether to
uniformly distribute selected oligonucleotides along the target, as
represented in step 375. A uniform distribution of oligonucleotide
sequences will aim to provide complete coverage throughout the
complete target nucleic acid or the selected functional regions. A
utility is used to automate the distribution of sequences, as
represented in step 380. Such a utility factors in parameters such
as length of the target nucleic acid, total number of
oligonucleotide sequences desired, oligonucleotide sequences per
unit length, number of oligonucleotide sequences per functional
region. Manual selection of oligonucleotide sequences is also
provided for by step 385. In some cases, it may be desirable to
manually select oligonucleotide sequences. For example, it may be
useful to determine the effect of small base shifts on activity.
Once the desired number of oligonucleotide sequences is obtained
either from step 380 or step 385, then these oligonucleotide
sequences are passed onto step 400 of the process, where
oligonucleotide chemistries are assigned.
8. Assignment of Actual Oligonucleotide Chemistry
[0096] Once a set of select nucleobase sequences has been generated
according to the preceding process and decision steps, actual
oligonucleotide chemistry is assigned to the sequences. An `actual
oligonucleotide chemistry` or simply `chemistry` is a chemical
motif that is common to a particular set of robotically synthesized
oligonucleotide compounds. Preferred chemistries include, but are
not limited to, oligonucleotides in which every linkage is a
phosphorothioate linkage, and chimeric oligonucleotides in which a
defined number of 5' and/or 3' terminal residues have a
2'-methoxyethoxy modification.
[0097] Chemistries can be assigned to the nucleobase sequences
during general procedure step 400 (FIG. 1). The logical basis for
chemistry assignment is illustrated in FIGS. 10 and 11 and an
iterative routine for stepping through an oligonucleotide
nucleoside by nucleoside is illustrated in FIG. 12. Chemistry
assignment can be effected by assignment directly into a word
processing program, via an inter-active word processing program or
via automated programs and devices. In each of these instances, the
output file is selected to be in a format that can serve as an
input file to automated synthesis devices.
9. Oligonucleotide Compounds
[0098] In the context of this invention, in reference to
oligonucleotides, the term `oligonucleotide` is used to refer to an
oligomer or polymer of ribonucleic acid (RNA) or deoxyribonucleic
acid (DNA) or mimetics thereof. Thus this term includes
oligonucleotides composed of naturally-occurring nucleobases,
sugars and covalent intemucleoside (backbone) linkages as well as
oligonucleotides having non-naturally-occurring portions which
function similarly. Such modified or substituted oligonucleotides
are often preferred over native forms, i.e., phosphodiester linked
A, C, G, T and U nucleosides, because of desirable properties such
as, for example, enhanced cellular uptake, enhanced affinity for
nucleic acid target and increased stability in the presence of
nucleases.
[0099] The oligonucleotide compounds in accordance with this
invention can be of various lengths depending on various
parameters, including but not limited to those discussed above in
reference to the selection criteria of general procedure 300. For
use as antisense oligonucleotides compounds of the invention
preferably are from about 8 to about 30 nucleobases in length.
Particularly preferred are antisense oligonucleotides comprising
from about 12 to about 25 nucleobases (i.e. from about 8 to about
30 linked nucleosides). A discussion of antisense oligonucleotides
and some desirable modifications can be found in De Mesmaeker et
al., Acc. Chem. Res., 1995, 28, 366. Other lengths of
oligonucleotides might be selected for non-antisense targeting
strategies, for instance using the oligonucleotides as ribozymes.
Such ribozymes normally require oligonucleotides of longer length
as is known in the art.
[0100] A nucleoside is a base-sugar combination. The base portion
of the nucleoside is normally a heterocyclic base. The two most
common classes of such heterocyclic bases are the purines and the
pyrimidines. Nucleotides are nucleosides that further include a
phosphate group covalently linked to the sugar portion of the
nucleoside. For those nucleosides that include a normal (where
normal is defined as being found in RNA and DNA) pentofuranosyl
sugar, the phosphate group can be linked to either the 2',3' or 5'
hydroxyl moiety of the sugar. In forming oligonucleotides, the
phosphate groups covalently link adjacent nucleosides to one
another to form a linear polymeric compound. In turn the respective
ends of this linear polymeric structure can be further joined to
form a circular structure, however, open linear structures are
generally preferred. Within the oligonucleotide structure, the
phosphate groups are commonly referred to as forming the
internucleoside backbone of the oligonucleotide. The normal linkage
or backbone of RNA and DNA is a 3' to 5' phosphodiester
linkage.
[0101] Specific examples of preferred oligonucleotides useful in
this invention include oligonucleotides containing modified
backbones or non-natural internucleoside linkages. As defined in
this specification, oligonucleotides having modified backbones
include those that retain a phosphorus atom in the backbone and
those that do not have a phosphorus atom in the backbone. For the
purposes of this specification, and as sometimes referenced in the
art, modified oligonucleotides that do not have a phosphorus atom
in their intemucleoside backbone can also be considered to be
oligonucleosides.
10. Selection of Oligonucleotide Chemistries
[0102] In a general logic scheme as illustrated in FIGS. 10 and 11,
for each nucleoside position, the user or automated device is
interrogated first for a base assignment, followed by a sugar
assignment, a linker assignment and finally a conjugate assignment.
Thus for each nucleoside, at process step 410 a base is selected.
In selecting the base, base chemistry 1 can be selected at process
step 412 or one or more alternative bases are selected at process
steps 414, 416 and 418. After base selection is effected, the sugar
portion of the nucleoside is selected. Thus for each nucleoside, at
process step 420 a sugar is selected that together with the select
base will complete the nucleoside. In selecting the sugar, sugar
chemistry 1 can be selected at process 422 or one or more
alternative sugars are selected at process steps 424, 426 and 428.
For each two adjacent nucleoside units, at process step 430, the
internucleoside linker is selected. The linker chemistry for the
internucleoside linker can be linker chemistry 1 selected at
process step 432 or one or more alternative internucleoside linker
chemistries are selected at process steps 434, 436 and 438.
[0103] In addition to the base, sugar and internucleoside linkage,
at each nucleoside position, one or more conjugate groups can be
attached to the oligonucleotide via attachment to the nucleoside or
attachment to the internucleoside link-age. The addition of a
conjugate group is integrated at process step 440 and the
assignment of the conjugate group is effected at process step
450.
[0104] For illustrative purposes in FIGS. 10 and 11, for each of
the base, the sugar, the internucleoside linkers, or the conjugate,
chemistries 1 though n are illustrated. As described in this
specification, it is understood that the number of alternate
chemistries between chemistry 1 and alternative chemistry n, for
each of the base, the sugar, the internucleoside linkage and the
conjugate, is variable and includes, but is not limited to, each of
the specific alternative bases, sugar, intemucleoside linkers and
conjugates identified in this specification as well as equivalents
known in the art.
[0105] Utilizing the logic as described in conjunction with FIGS.
10 and 11, chemistry is assigned, as is shown in FIG. 12, to the
list of oligonucleotides from general procedure 300. In assigning
chemistries to the oligonucleotides in this list, a pointer can be
set at process step 452 to the first oligonucleotide in the list
and at step 453 to the first nucleotide of that first
oligonucleotide. The base chemistry is selected at step 410, as
described above, the sugar chemistry is selected at step 420, also
as described above, followed by selection of the intemucleoside
linkage at step 430, also as described above. At decision 440, the
process branches depending on whether a conjugate will be added at
the current nucleotide position. If a conjugate is desired, the
conjugate is selected at step 450, also as described above.
[0106] Whether or not a conjugate was added at decision step 440,
an inquiry is made at decision step 454. This inquiry asks if the
pointer resides at the last nucleotide in the current
oligonucleotide. If the result at decision step 454 is `No`, the
pointer is moved to the next nucleotide in the current
oligonucleotide and the loop including steps 410, 420, 430, 440 and
454 is repeated. This loop is reiterated until the result at
decision step 454 is `Yes.`
[0107] When the result at decision step 454 is `Yes`, a query is
made at decision step 460 concerning the location of the pointer in
the list of oligonucleotides. If the pointer is not at the last
oligonucleotide of the list, the `No` path of the decision step 460
is followed and the pointer is moved to the next oligonucleotide in
the list at process step 458. With the pointer set to the next
oligonucleotide in the list, the loop that starts at process steps
453 is reiterated. When the result at decision step 460 is `Yes`,
chemistry has been assigned to all of the nucleotides in the list
of oligonucleotides.
11. Description of Oligonucleotide Chemistries
[0108] As is illustrated in FIG. 10, for each nucleoside of an
oligonucleotide, chemistry selection includes selection of the base
forming the nucleoside from a large palette of different base units
available. These may be `modified` or `natural` bases (also
reference herein as nucleobases) including the natural purine bases
adenine (A) and guanine (G), and the natural pyrimidine bases
thymine (T), cytosine (C) and uracil (U). They further can include
modified nucleo-bases including other synthetic and natural
nucleobases such as 5-methylcytosine (5-me-C), 5-hydroxymethyl
cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and
other alkyl derivatives of adenine and guanine, 2-propyl and other
alkyl derivatives of adenine and guanine, 2-thiouracil,
2-thiothymine and 2-thiocytosine, 5-propynyl uracil and cytosine,
6-azo uracil, cytosine and thymine, 5-uracil (pseudouracil),
4-thiouracil, 8-halo, 8-amino, 8-thiol, 8-thio-alkyl, 8-hydroxyl
and other 8-substituted adenines and guanines, 5-halo uracils and
cytosines particularly 5-bromo, 5-trifluoromethyl and other
5-substituted uracils and cytosines, 7-methylguanine and
7-methyladenine, 8-azaguanine and 8-azaadenine, 7-deazaguanine and
7-deazaadenine and 3-deazaguanine and 3-deazaadenine. Further
nucleo-bases include those disclosed in U.S. Pat. No. 3,687,808,
those disclosed in the Concise Encyclopedia Of Polymer Science And
Engineering, pages 858-859, Kroschwitz, J. I., ed. John Wiley &
Sons, 1990, those disclosed by Englisch et al., Angewandte Chemie,
International Edition, 1991, 30, 613, and those disclosed by
Sanghvi, Y. S., Chapter 15, Antisense Research and Applications,
pages 289-302, Crooke, S. T. and Lebleu, B., ed., CRC Press, 1993.
Certain of these nucleobases are particularly useful for increasing
the binding affinity of the oligomeric compounds of the invention.
These include 5-substituted pyrimidines, 6-aza-pyrimidines and N-2,
N-6 and 0-6 substituted purines, including 2-aminopropyladenine,
5-propynyluracil and 5-propynylcytosine. 5-methylcytosine
substitutions have been shown to increase nucleic acid duplex
stability by 0.6-1.2.degree. C. (Sanghvi, Y. S., Crooke, S. T. and
Lebleu, B., eds., Antisense Research and Applications, CRC Press,
Boca Raton, 1993, pp. 276-278) and are presently preferred for
selection as the base. These are particularly useful when combined
with a 2'-methoxyethyl sugar modifications, described below.
[0109] Representative United States patents that teach the
preparation of certain of the above noted modified nucleobases as
well as other modified nucleobases include, but are not limited to,
the above noted U.S. Pat. No. 3,687,808, as well as U.S. Pat. Nos.
4,845,205; 5,130,302; 5,134,066; 5,175,273; 5,367,066; 5,432,272;
5,457,187; 5,459,255; 5,484,908; 5,502,177; 5,525,711; 5,552,540;
5,587,469; 5,594,121, 5,596,091; 5,614,617; and 5,681,941,
Reference is also made to allowed U.S. patent application Ser. No.
08/762,488, filed on Dec. 10, 1996, commonly owned with the present
application and herein incorporated by reference.
[0110] In selecting the base for any particular nucleoside of an
oligonucleotide, consideration is first given to the need of a base
for a particular specificity for hybridization to an opposing
strand of a particular target. Thus if an `A base is required,
adenine might be selected however other alternative bases that can
effect hybridization in a manner mimicking an `A base such as
2,6-diaminopurine might be selected should other considersation,
e.g., stronger hybridization (relative to hybridization achieved
with adenine), be desired.
[0111] As is illustrated in FIG. 10, for each nucleoside of an
oligonucleotide, chemistry selection includes selection of the
sugar forming the nucleoside from a large palette of different
sugar or sugar surrogate units available. These may be modified
sugar groups, for instance sugars containing one or more
substituent groups. Preferred substituent groups comprise the
following at the 2' position: OH; F; O--, S--, or N-alkyl, O--,
S--, or N-alkenyl, or O, S-- or N-alkynyl, wherein the alkyl,
alkenyl and alkynyl may be substituted or unsubstituted C.sub.i to
C.sub.10 alkyl or C.sub.2 to C.sub.ID alkenyl and alkynyl.
Particularly preferred are O[(CH.sub.2).sub.nO].sub.mCH.sub.3,
O(CH.sub.2).sub.nOCH.sub.3, O(CH.sub.2).sub.nNH.sub.2,
O(CH.sub.2).sub.nCH.sub.3, O(CH.sub.2).sub.nONH.sub.2, and
O(CH.sub.2).sub.nON[(CH.sub.2).sub.nCH.sub.3)].sub.2, where n and m
are from 1 to about 10. Other preferred substituent groups comprise
one of the following at the 2' position: C.sub.1 to C.sub.ID lower
alkyl, substituted lower alkyl, alkaryl, aralkyl, O -alkaryl or O
-aralkyl, SH, SCH.sub.3, OCN, Cl, Br, CN, CF.sub.3, OCF.sub.3,
SOCH.sub.3, SO.sub.2CH.sub.3, ON O.sub.2, NO.sub.2, N.sub.3,
NH.sub.2, heterocycloalkyl, heterocycloalkaryl, aminoalkylamino,
poly-alkylamino, substituted silyl, an RNA cleaving group, a
reporter group, an intercalator, a group for improving the
pharmacokinetic properties of an oligonucleotide, or a group for
improving the pharmacodynamic properties of an oligonucleotide, and
other substituents having similar properties. A preferred
modification includes 2'-methoxyethoxy
(2'-O--CH.sub.2CH.sub.2OCH.sub.3, also known as
2'-O-(2-methoxyethyl) or 2'-MOE) (Martin et al., Helv. Chim. Acta,
1995, 78, 486) i.e., an alkoxyalkoxy group. A further preferred
modification includes 2'-dimethylamino oxyethoxy, i.e., a
O(CH).sub.2O N(CH.sub.3).sub.2 group, also known as 2'-DMAOE, as
described in co-owned U.S. patent application Ser. No. 09/016,520,
filed on Jan. 30, 1998, the contents of which are herein
incorporated by reference.
[0112] Other preferred modifications include 2'-methoxy
(2'-O--CH3), 2'-aminopropoxy (2'-OCH.sub.2CH.sub.2CH.sub.2NH.sub.2)
and 2'-fluoro (2'-F). Similar modifications may also be made at
other positions on the sugar group, particularly the 3' position of
the sugar on the 3' terminal nucleotide or in 2'-5' linked
oligonucleotides and the 5' position of 5' terminal nucleotide. The
nucleosides of the oligonucleotides may also have sugar mimetics
such as cyclobutyl moieties in place of the pentofuranosyl
sugar.
[0113] Representative United States patents that teach the
preparation of such modified sugars structures include, but are not
limited to, U.S. Pat. Nos. 4,981,957; 5,118,800; 5,319,080;
5,359,044; 5,393,878; 5,446,137; 5,466,786; 5,514,785; 5,519,134;
5,567,811; 5,576,427; 5,591,722; 5,597,909; 5,610,300; 5,627,053;
5,639,873; 5,646,265; 5,658,873; 5,670,633; and 5,700,920, certain
of which are commonly owned with the present application, each of
which is herein incorporated by reference, together with allowed
U.S. patent application Ser. No. 08/468,037, filed on Jun. 5, 1995,
which is commonly owned with the present application and is herein
incorporated by reference.
[0114] As is illustrated in FIG. 10, for each adjacent pair of
nucleosides of an oligonucleotide, chemistry selection includes
selection of the intemucleoside linkage. These intemucleoside
linkages are also referred to as linkers, backbones or
oligonucleotide backbones. For forming these nucleoside linkages, a
palette of different intemucleoside linkages or backbones is
available. These include modified oligonucleotide backbones, for
example, phosphorothioates, chiral phosphorothioates,
phosphorodithioates, phosphotriesters, aminoalkylphosphotriesters,
methyl and other alkyl phosphonates including 3'-alkylene
phosphonates and chiral phosphonates, phosphinates,
phosphoramidates including 3'-amino phosphorarnidate and
aminoalkylphosphoramidates, thionophosphoramidates,
thionoalkylphosphonates, thionoalklyphosphotriesters, and
boranophosphates having normal 3'-5' linkages, 2'-5' linked analogs
of these, and those having inverted polarity wherein the adjacent
pairs of nucleoside units are linked 3'-5' to 5'-3' or 2'-5' to
5'-2'. Various salts, mixed salts and free acid forms are also
included.
[0115] Representative United States patents that teach the
preparation of the above phosphorus containing linkages include,
but are not limited to, U.S. Pat. Nos. 3,687,808; 4,469,863;
4,476,301; 5,023,243; 5,177,196; 5,188,897; 5,264,423; 5,276,019;
5,278,302; 5,286,717; 5,321,131; 5,399,676; 5,405,939; 5,453,496;
5,455,233; 5,466,677; 5,476,925; 5,519,126; 5,536,821; 5,541,306;
5,550,111; 5,563,253; 5,571,799; 5,587,361; 5,625,050; and
5,697,248, certain of which are commonly owned with this
application, and each of which is herein incorporated by
reference.
[0116] Preferred intemucleoside linkages for oligonucleotides that
do not include a phosphorus atom therein, i.e., for
oligonucleosides, have backbones that are formed by short chain
alkyl or cycloalkyl intersugar linkages, mixed heteroatom and alkyl
or cycloalkyl intersugar linkages, or one or more short chain
heteroatomic or heterocyclic intersugar linkages. These include
those having morpholino linkages (formed in part from the sugar
portion of a nucleoside); siloxane backbones; sulfide, sulfoxide
and sulfone back-bones; formacetyl and thioformacetyl backbones;
methylene formacetyl and thioformacetyl backbones; alkene
containing backbones; sulfamate backbones; methyleneimino and
methylenehydrazino backbones; sulfonate and sulfonamide backbones;
amide backbones; and others having mixed N, O, S and CH.sub.2
component parts.
[0117] Representative United States patents that teach the
preparation of the above oligonucleosides include, but are not
limited to, U.S. Pat. Nos. 5,034,506; 5,166,315; 5,185,444;
5,214,134; 5,216,141; 5,235,033; 5,264,562; 5,264,564; 5,405,938;
5,434,257; 5,466,677; 5,470,967; 5,489,677; 5,541,307; 5,561,225;
5,596,086; 5,602,240; 5,610,289; 5,602,240; 5,608,046; 5,610,289;
5,618,704; 5,623,070; 5,663,312; 5,633,360; 5,677,437; and
5,677,439, certain of which are commonly owned with this
application, and each of which is herein incorporated by
reference.
[0118] In other preferred oligonucleotides, i.e., oligonucleotide
mimetics, both the sugar and the intersugar linkage, i.e., the
backbone, of the nucleotide units are replaced with novel groups.
The base units are maintained for hybridization with an appropriate
nucleic acid target compound. One such oligomeric compound, an
oligonucleotide mimetic that has been shown to have excellent
hybridization properties, is referred to as a peptide nucleic acid
(PNA). In PNA compounds, the sugar-phosphate backbone of an
oligonucleotide is replaced with an amide-containing backbone, in
particular an aminoethylglycine backbone. The nucleobases are
retained and are bound directly or indirectly to aza nitrogen atoms
of the amide portion of the backbone. Representative United States
patents that teach the preparation of PNA compounds include, but
are not limited to, U.S. Pat. Nos. 5,539,082; 5,714,331; and
5,719,262, each of which is herein incorporated by reference.
Further teaching of PNA compounds can be found in Nielsen et al.,
Science, 1991, 254, 1497.
[0119] For the intemucleoside linkages, the most preferred
embodiments of the invention are oligonucleotides with
phosphorothioate backbones and oligonucleosides with heteroatom
backbones, and in particular --CHz NH--OCH.sub.z, --CHz
N(CH.sub.3)--O--CH.sub.2-[known as a methylene (methylimino) or MMI
backbone], --CHz O--N(CH.sub.3)--CHz, --CHz
N(CH.sub.3)--N(CH.sub.3)--CHz and --O--N(CH.sub.3)--CH.sub.2--CHz
[wherein the native phosphodiester backbone is represented as
--O--P--O--CHz] of the above referenced U.S. Pat. No. 5,489,677,
and the amide backbones of the above referenced U.S. Pat. No.
5,602,240. Also preferred are oligonucleotides having morpholino
backbone structures of the above-referenced U.S. Pat. No.
5,034,506.
[0120] In attaching a conjugate group to one or more nucleosides or
intemucleoside linkages of an oligo-nucleotide, various properties
of the oligonucleotide are modified. Thus modification of the
oligonucleotides of the invention to chemically link one or more
moieties or conjugates to the oligonucleotide are intended to
enhance the activity, cellular distribution or cellular uptake of
the oligonucleotide. Such moieties include but are not limited to
lipid moieties such as a cholesterol moiety (Letsinger et al.,
Proc. Natl. Acad. Sci. USA, 1989, 86, 6553), cholic acid (Manoharan
et al., Bioorg. Med. Chem. Let., 1994, 4, 1053), a thioether, e.g.,
hexyl-S-tritylthiol (Manoharan et al., Ann. N.Y. Acad. Sci., 1992,
660, 306; Manoharan et al., Bioorg. Med. Chem. Let., 1993, 3,
2765), a thiocholesterol (Oberhauser et al., Nucl. Acids Res.,
1992, 20, 533), an aliphatic chain, e.g., dodecandiol or undecyl
residues (Saison-Behmoaras et al., EMBO J., 1991, 10, 111; Kabanov
et al., FEBS Lett., 1990, 259, 327; Svinarchuk et al., Biochimie,
1993, 75, 49), a phospholipid, e.g., di-hexadecyl-rac-glycerol or
triethylammonium 1,2-di-O-hexadecyl-rac-glycero-3-H-phosphonate
(Manoharan et al., Tetrahedron Lett., 1995, 36, 3651; Shea et al.,
Nucl. Acids Res., 1990, 18, 3777), a polyamine or a polyethylene
glycol chain (Manoharan et al., Nucleosides & Nucleotides,
1995, 14, 969), or adamantane acetic acid (Manoharan et al.,
Tetrahedron Lett., 1995, 36, 3651), a palmityl moiety (Mishra et
al., Biochim. Biophys. Acta, 1995, 1264, 229), or an octadecylamine
or hexylamino-carbonyl-oxycholesterol moiety (Crooke et al., J.
Pharmacol. Exp. Ther, 1996, 277, 923).
[0121] Representative United States patents that teach the
preparation of such oligonucleotide conjugates include, but are not
limited to, U.S. Pat. Nos. 4,828,979; 4,948,882; 5,218,105;
5,525,465; 5,541,313; 5,545,730; 5,552,538; 5,578,717, 5,580,731;
5,580,731; 5,591,584; 5,109,124; 5,118,802; 5,138,045; 5,414,077;
5,486,603; 5,512,439; 5,578,718; 5,608,046; 4,587,044; 4,605,735;
4,667,025; 4,762,779; 4,789,737; 4,824,941; 4,835,263; 4,876,335;
4,904,582; 4,958,013; 5,082,830; 5,112,963; 5,214,136; 5,082,830;
5,112,963; 5,214,136; 5,245,022; 5,254,469; 5,258,506; 5,262,536;
5,272,250; 5,292,873; 5,317,098; 5,371,241, 5,391,723; 5,416,203,
5,451,463; 5,510,475; 5,512,667; 5,514,785; 5,565,552; 5,567,810;
5,574,142; 5,585,481; 5,587,371; 5,595,726; 5,597,696; 5,599,923;
5,599,928 and 5,688,941, certain of which are commonly owned with
the present application, and each of which is herein incorporated
by reference.
12. Chimeric Compounds
[0122] It is not necessary for all positions in a given compound to
be uniformly modified. In fact, more than one of the aforementioned
modifications may be incorporated in a single compound or even at a
single nucleoside within an oligonucleotide. The present invention
also includes compounds which are chimeric compounds. `Chimeric`
compounds or `chimeras,` in the context of this invention, are
compounds, particularly oligonucleotides, which contain two or more
chemically distinct regions, each made up of at least one monomer
unit, i.e., a nucleotide in the case of an oligonucleotide
compound. These oligonucleotides typically contain at least one
region wherein the oligonucleotide is modified so as to confer upon
the oligonucleotide increased resistance to nuclease degradation,
increased cellular uptake, and/or increased binding affinity for
the target nucleic acid. An additional region of the
oligonucleotide may serve as a substrate for enzymes capable of
cleaving RNA:DNA or RNA:RNA hybrids.
[0123] By way of example, RNase H is a cellular endonuclease which
cleaves the RNA strand of an RNA:DNA duplex. Activation of RNase H,
therefore, results in cleavage of the RNA target, thereby greatly
enhancing the efficiency of oligonucleotide inhibition of gene
expression. Consequently, comparable results can often be obtained
with shorter oligonucleotides when chimeric oligonucleotides are
used, compared to phosphorothioate deoxyoligonucleotides
hybridizing to the same target region. Cleavage of the RNA target
can be routinely detected by gel electrophoresis and, if necessary,
associated nucleic acid hybridization techniques known in the
art.
[0124] Chimeric antisense compounds of the invention may be formed
as composite structures representing the union of two or more
oligonucleotides, modified oligonucleotides, oligonucleosides
and/or oligonucleotide mimetics as described above. Such compounds
have also been referred to in the art as "hybrids" or "gapmers".
Representative United States patents that teach the preparation of
such hybrid structures include, but are not limited to, U.S. Pat.
Nos. 5,013,830; 5,149,797; 5,220,007; 5,256,775; 5,366,878;
5,403,711; 5,491,133; 5,565,350; 5,623,065; 5,652,355; 5,652,356;
and 5,700,922, certain of which are commonly owned with the present
application and each of which is herein incorporated by reference,
together with commonly owned and allowed U.S. patent application
Ser. No. 08/465,880, filed on Jun. 6, 1995, also herein
incorporated by reference.
13. Description of Automated Oligonucleotide Synthesis
[0125] In the next step of the overall process (illustrated in
FIGS. 1 and 2), oligonucleotides are synthesized on an automated
synthesizer. Although many devices may be employed, the synthesizer
is preferably a variation of the synthesizer described in U.S. Pat.
Nos. 5,472,672 and 5,529,756, the entire contents of which are
herein incorporated by reference. The synthesizer described in
those patents is modified to include movement in along the Y axis
in addition to movement along the X axis. As so modified, a 96-well
array of compounds can be synthesized by the synthesizer. The
synthesizer further includes temperature control and the ability to
maintain an inert atmosphere during all phases of synthesis. The
reagent array delivery format employs orthogonal X-axis motion of a
matrix of reaction vessels and Y-axis motion of an array of
reagents. Each reagent has its own dedicated plumbing system to
eliminate the possibility of cross-contamination of reagents and
line flushing and/or pipette washing. This in combined with a high
delivery speed obtained with a reagent mapping system allows for
the extremely rapid delivery of reagents. This further allows long
and complex reaction sequences to be performed in an efficient and
facile manner.
[0126] The software that operates the synthesizer allows the
straightforward programming of the parallel synthesis of a large
number of compounds. The software utilizes a general synthetic
procedure in the form of a command (.cmd) file, which calls upon
certain reagents to be added to certain wells via lookup in a
sequence (.seq) file. The bottle position, flow rate, and
concentration of each reagent is stored in a lookup table (.tab)
file. Thus, once any synthetic method has been outlined, a plate of
compounds is made by permutating a set of reagents, and writing the
resulting output to a text file. The text file is input directly
into the synthesizer and used for the synthesis of the plate of
compounds. The synthesizer is interfaced with a relational database
allowing data output related to the synthesized compounds to be
registered in a highly efficient manner.
[0127] Building of the .seq, .cmd and .tab files is illustrated in
FIG. 13. Thus as a part of the general oligonucleotide synthesis
procedure 500, for each linker chemistry at process step 502, a
synthesis file, i.e., a .cmd file, is built at process step 504.
This file can be built fresh to reflect a completely new set of
machine commands reflecting a set of chemical synthesis steps or it
can modify an existing file stored at process step 504 by editing
that stored file in process step 508. The .cmd files are built
using a word processor and a command set of instructions as
outlined below.
[0128] It will be appreciated that the preparation of control
software and data files is within the routine skill of persons
skilled in anotated nucleotide synthesis. The same will depend upon
the hardware employed, the chemistries adopeted and the design
paradigm selected by the operator.
[0129] In a like manner to the building the .cmd files, .tab files
are built to reflect the necessary reagents used in the automatic
synthesizer for the particular chemistries that have been selected
for the linkages, bases, sugars and conjugate chemistries. Thus for
each of a set of these chemistries at process step 510, a .tab file
is built at process step 512 and stored at process step 514. As
with the .cmd files, an existing tab file can be edited at process
step 516.
[0130] Both the .cmd files and the tab files are linked together at
process step 518 and stored for later retrieval in an appropriate
sample database 520. Linking can be as simple as using like file
names to associate a .cmd file to its appropriate tab file, e.g.,
synthesis 1.cmd is linked to synthesis 1. tab by use of the same
preamble in their names.
[0131] The automated, multi-well parallel array synthesizer employs
a reagent array delivery format, in which each reagent utilized has
a dedicated plumbing system. As seen in FIGS. 23 and 24, an inert
atmosphere 522 is maintained during all phases of a synthesis.
Temperature is controlled via a thermal transfer plate 524, which
holds an injection molded reaction block 526. The reaction plate
assembly slides in the X-axis direction, while for example eight
nozzle blocks (528, 530, 532, 534, 536, 538, 540 and 542) holding
the reagent lines slide in the Y-axis direction, allowing for the
extremely rapid delivery of any of 64 reagents to 96 wells. In
addition, there are for example, six banks of fixed nozzle blocks
(544, 546, 548, 550, 552 and 554) which deliver the same reagent or
solvent to eight wells at once, for a total of 72 possible
reagents.
[0132] In synthesizing oligonucleotides for screening, the target
reaction vessels, a 96 well plate 556 (a 2-dimensional array),
moves in one direction along the X axis, while the series of
independently controlled reagent delivery nozzles (528, 530, 532,
534, 536, 538, 540 and 542) move along the Y-axis relative to the
reaction vessel 558. As the reaction plate 556 and reagent nozzles
(528, 530, 532, 534, 536, 538, 540 and 542) can be moved
independently at the same time, this arrangement facilitated the
extremely rapid delivery of up to 72 reagents independently to each
of the 96 reaction vessel wells.
[0133] The system software allows the straightforward programming
of the synthesis of a large number of compounds by supplying the
general synthetic procedure in the form of the command file to call
upon certain reagents to be added to specific wells via lookup in
the sequence file with the bottle position, flow rate, and
concentration of each reagent being stored in the separate reagent
table file. Compounds can be synthesized on various scales. For
oligonucleotides, a 200 nmole scale is typically selected while for
other compounds larger scales, as for example a 10 .mu.mole scale
(3-5 mg), might be utilized. The resulting crude compounds are
generally >80% pure, and are utilized directly for high
throughput screening assays. Alternatively, prior to use the plates
can be subjected to quality control (see general procedure 600 and
Example 9) to ascertain their exact purity. Use of the synthesizer
results in a very efficient means for the parallel synthesis of
compounds for screening.
[0134] The software inputs accept tab delimited text files (as
discussed above for file 504 and 512) from any text editor. A
typical command file, a .cmd file, is shown in Example 3 at Table
2. Typical sequence files, seq files, are shown in Example 3 at
Tables 3 and 4 (.SEQ file), and a typical reagent file, a tab file,
is shown in Example 3 at Table 5. Table 3 illustrates the sequence
file for an oligonucleotide having 2'-deoxy nucleotides at each
position with a phosphorothioate backbone throughout. Table 4
illustrates the sequence file for an oligonucleotide, again having
a phosphorothioate backbone throughout, however, certain modified
nucleoside are utilized in portions of the oligonucleotide. As
shown in this table, 2'-O-(methoxyethyl) modified nucleoside are
utilized in a first region (a wing) of the oligonucleotide,
followed by a second region (a gap) of 2'-deoxy nucleotides and
finally a third region (a further wing) that has the same chemistry
as the first region. Typically some of the wells of the 96 well
plate 556 may be left empty (depending on the number of
oligonucleotides to be made during an individual synthesis) or some
of the well may have oligonucleotides that will serve as standards
for comparison or analytical purposes.
[0135] Prior to loading reagents, moisture sensitive reagent lines
are purged with argon at 522 for 20 minutes. Reagents are dissolved
to appropriate concentrations and installed on the synthesizer.
Large bottles, collectively identified as 558 in FIG. 23
(containing 8 delivery lines) are used for wash solvents and the
delivery of general activators, trityl group cleaving reagents and
other reagents that may be used in multiple wells during any
particular synthesis. Small septa bottles, collectively identified
as 560 in FIG. 23, are utilized to contain individual nucleotide
amidite precursor compounds. This allows for anhydrous preparation
and efficient installation of multiple reagents by using needles to
pressurize the bottle, and as a delivery path. After all reagents
are installed, the lines are primed with reagent, flow rates
measured, then entered into the reagent table (.tab file). A dry
resin loaded plate is removed from vacuum and installed in the
machine for the synthesis.
[0136] The modified 96 well polypropylene plate 556 is utilized as
the reaction vessel. The working volume in each well is
approximately 700 .mu.l. The bottom of each well is provided with a
pressed-fit 20 .mu.m polypropylene frit and a long capillary exit
into a lower collection chamber as is illustrated in FIG. 5 of the
above referenced U.S. Pat. No. 5,372,672. The solid support for use
in holding the growing oligonucleotide during synthesis is loaded
into the wells of the synthesis plate 556 by pipetting the desired
volume of a balanced density slurry of the support suspended in an
appropriate solvent, typically an acetonitrile-methylene chloride
mixture. Reactions can be run on various scales as for instance the
above noted 200 nmole and 10 .mu.mol scales. For oligonucleotide
synthesis a CPG support is preferred, however other medium loading
polystyrene-PEG supports such as TentaGel.TM. or ArgoGel.TM. can
also be used.
[0137] As seen in FIG. 24, the synthesis plate is transported back
and forth in the X-direction under an array of 8 moveable banks
(530, 532, 534, 536, 538, 540, 542 and 544) of 8 nozzles (64 total)
in the Y-direction, and 6 banks (544, 546, 548, 550, 552 and 554)
of 48 fixed nozzles, so that each well can receive the appropriate
amounts of reagents and/or solvents from any reservoir (large
bottle or smaller septa bottle). A sliding balloon-type seal 562
surrounds this nozzle array and joins it to the reaction plate
headspace 564. A slow sweep of nitrogen or argon 522 at ambient
pressure across the plate headspace is used to preserve an
anhydrous environment.
[0138] The liquid contents in each well do not drip out until the
headspace pressure exceeds the capillary forces on the liquid in
the exit nozzle. A slight positive pressure in the lower collection
chamber can be added to eliminate residual slow leakage from filled
wells, or to effect agitation by bubbling inert gas through the
suspension. In order to empty the wells, the headspace gas outlet
valve is closed and the internal pressure raised to about 2 psi.
Normally, liquid contents are blown directly to waste 566. However,
a 96 well microtiter plate can be inserted into the lower chamber
beneath the synthesis plate in order to collect the individual well
eluents for spectrophotometric monitoring (trityl, etc.) of
reaction progress and yield.
[0139] The basic plumbing scheme for the machine is the
gas-pressurized delivery of reagents. Each reagent is delivered to
the synthesis plate through a dedicated supply line, collectively
identified at 568, solenoid valve collectively identified at 570
and nozzle, collectively identified at 572. Reagents never cross
paths until they reach the reaction well. Thus, no line needs to be
washed or flushed prior to its next use and there is no possibility
of cross-contamination of reagents. The liquid delivery velocity is
sufficiently energetic to thoroughly mix the contents within a well
to form a homogeneous solution, even when employing solutions
having drastically different densities. With this mixing, once
reactants are in homogeneous solution, diffusion carries the
individual components into and out of the solid support matrix
where the desired reaction takes place. Each reagent reservoir can
be plumbed to either a single nozzle or any combination of up to 8
nozzles. Each nozzle is also provided with a concentric nozzle
washer to wash the outside of the delivery nozzles in order to
eliminate problems of crystallized reactant buildup due to slow
evaporation of solvent at the tips of the nozzles. The nozzles and
supply lines can be primed into a set of dummy wells directly to
waste at any time.
[0140] The entire plumbing system is fabricated with teflon tubing,
and reagent reservoirs are accessed via syringe needle/septa or
direct connection into the higher capacity bottles. The septum
vials 560 are held in removable 8-bottle racks to facilitate easy
setup and cleaning. The priming volume for each line is about 350
.mu.l. The minimum delivery volume is about 2 .mu.l, and flow rate
accuracy is .+-.5%. The actual amount of material delivered depends
on a timed flow of liquid. The flow rate for a particular solvent
will depend on its viscosity and wetting characteristics of the
teflon tubing. The flow rate (typically 200-350 .mu.l per sec) is
experimentally determined, and this information is contained in the
reagent table setup file.
[0141] Heating and cooling of the reaction block 526 is effected
utilizing a recirculating heat exchanger plate 524, similar to that
found in PCR thermocyclers, that nests with the polypropylene
synthesis plate 556 to provide good thermal contact. The liquid
contents in a well can be heated or cooled at about 10.degree. C.
per minute over a range of +5 to +80.degree. C., as polypropylene
begins to soften and deform at about 80.degree. C. For temperatures
greater than this, a non-disposable synthesis plate machined from
stainless steel or monel with replaceable frits can be
utilized.
[0142] The hardware controller can be any of a wide variety, but
conveniently can be designed around a set of three 1 MHz 86332
chips. This controller is used to drive the single X-axis and 8
Y-axis stepper motors as well as provide the timing functions for a
total of 154 solenoid valves. Each chip has 16 bidirectional timer
I/O and 8 interrupt channels in its timer processing unit (TPU).
These are used to provide the step and direction signals, and to
read 3 encoder inputs and 2 limit switches for controlling up to
three motors per chip. Each 86332 chip also drives a serial chain
of 8 UNC5891A darlington array chips to provide power to 64 valves
with msec resolution. The controller communicates with the Windows
software interface program running on a PC via a 19200 Hz serial
channel, and uses an elementary instruction set to communicate
valve_number, time_open, motor_number and position_data.
[0143] The three components of the software program that run the
array synthesizer, the generalized procedure or command (.cmd) file
which specifies the synthesis instructions to be performed, the
sequence (.seq) file which specifies the scale of the reaction and
the order in which variable groups will be added to the core
synthon, and the reagent table (.tab) file which specifies the name
of a chemical, its location (bottle number), flow rate, and
concentration are utilized in conjunction with a basic set of
command instructions.
[0144] One basic set of command instructions can be:
1 ADD IF {block of instructions} END IF REPEAT {block of
instructions } END REPEAT PRIME, NOZZLE WASH WAIT, DPAIN LOAD,
REMOVE NEXT SEQUENCE LOOP BEGIN, LOOP END
[0145] The ADD instruction has two forms, and is intended to have
the look and feel of a standard chemical equation. Reagents are
specified to be added by a molar amount if the number proceeds the
name identifier, or by an absolute volume in microliters if the
number follows the identifier. The number of reagents to be added
is a parsed list, separated by the `+` sign. For variable reagent
identifiers, the key word, <seq>, means look in the sequence
table for the identity of the reagent to be added, while the key
word, <act>, means add the reagent which is associated with
that particular <seq>. Reagents are delivered in the order
specified in the list.
[0146] Thus:
2 ADD ACN 300 means: Add 300 .mu.i of the named reagent
acetonitrile; ACN to each well of active synthesis ADD <seq>
300 means: If the sequence pointer in the .seq file is to a reagent
in the list of reagents, independent of scale, add 300 .mu.i of
that particular reagent specified for that well. ADD 1.1 PYR + 1.0
<seq> + 1.1 <actl> means: If the sequence pointer in
the .seq file is to a reagent in the list of acids in the Class
ACIDS_1, and PYR is the name of pyridine, and ethyl chloroformate
is defined in the .tab file to activate the class, ACIDS_1 then
this instruction means: Add 1.1 equiv. pyridine 1.0 equiv. of the
acid specified for that well and 1.1 equiv. of the activator, ethyl
chloroformate The IF command allows one to test what type of
reagent is specified in the <seq> variable and process the
succeeding block of commands accordingly. Thus: ACYLATION {the
procedure name} BEGIN IF CLASS = ACIDS_1 ADD 1.0 <seq> + 1.1
<actl> + 1.1 PYR WAIT 60 ENDIF IF CLASS = ACIDS_2 ADD 1.0
<seq> + 1.2 <actl> + 1.2 TEA ENDIF WAIT 60 DRAIN 10
END
[0147] means: Operate on those wells for which reagents contained
in the Acid.sub.--1 class are specified, WAIT 60 sec, then operate
on those wells for which reagents contained in the Acid.sub.--2
class are specified, then WAIT 60 sec longer, then DRAIN the whole
plate. Note that the Acid.sub.--1 group has reacted for a total of
120 sec, while the Acid.sub.--2 group has reacted for only 60
sec.
[0148] The REPEAT command is a simple way to execute the same block
of commands multiple times.
[0149] Thus:
3 WASH_1 {the procedure name} BEGIN REPEAT 3 ADD ACN 300 DRAIN 15
END_EPEAT END
[0150] means: repeats the add acetonitrile and drain sequence for
each well three times.
[0151] The PRIME command will operate either on specific named
reagents or on nozzles which will be used in the next associated
<seq> operation. The .mu.l amount dispensed into a prime port
is a constant that can be specified in a config.dat file.
[0152] The NOZZLE_WASH command for washing the outside of reaction
nozzles free from residue due to evaporation of reagent solvent
will operate either on specific named reagents or on nozzles which
have been used in the preceding associated <seq> operation.
The machine is plumbed such that if any nozzle in a block has been
used, all the nozzles in that block will be washed into the prime
port.
[0153] The WAIT and DRAIN commands are by seconds, with the drain
command applying a gas pressure over the top surface of the plate
in order to drain the wells.
[0154] The LOAD and REMOVE commands are instructions for the
machine to pause for operator action.
[0155] The NEXT_SEQUENCE command increments the sequence pointer to
the next group of substituents to be added in the sequence file.
The general form of a seq file entry is the definition:
[0156] Well_No Well_ID Scale Sequence
[0157] The sequence information is conveyed by a series of columns,
each of which represents a variable reagent to be added at a
particular position. The scale (.mu.mole) variable is included so
that reactions of different scale can be run at the same time if
desired. The reagents are defined in a lookup table (the .tab
file), which specifies the name of the reagent as referred to in
the sequence and command files, its location (bottle number), flow
rate, and concentration. This information is then used by the
controller software and hardware to determine both the appropriate
slider motion to position the plate and slider arms for delivery of
a specific reagent, as well as the specific valve and time required
to deliver the appropriate reagents. The adept classification of
reagents allows the use of conditional IF loops from within a
command file to perform addition of different reagents differently
during a `single step` performed across 96 wells simultaneously.
The special class ACTIVATORS defines certain reagents that always
get added with a particular class of reagents (for example
tetrazole during a phosphitylation reaction in adding the next
nucleotide to a growing oligonucleotide).
[0158] The general form of the .tab file is the definition:
[0159] Class Bottle Reagent Name Flow_rate Conc.
[0160] The LOOP_BEGIN and LOOP_END commands define the block of
commands which will continue to operate until a NEXT_SEQUENCE
command points past the end of the longest list of reactants in any
well.
[0161] Not included in the command set is a MOVE command. For all
of the above commands, if any plate or nozzle movement is required,
this is automatically executed in order to perform the desired
solvent or reagent delivery operation. This is accomplished by the
controller software and hardware, which determines the correct
nozzle(s) and well(s) required for a particular reagent addition,
then synchronizes the position of the requisite nozzle and well
prior to adding the reagent.
[0162] A MANUAL mode can also be utilized in which the synthesis
plate and nozzle blocks can be `homed` or moved to any position by
the operator, the nozzles primed or washed, the various reagent
bottles depressurized or washed with solvent, the chamber
pressurized, etc. The automatic COMMAND mode can be interrupted at
any point, MANUAL commands executed, and then operation resumed at
the appropriate location. The sequence pointer can be incremented
to restart a synthesis anywhere within a command file.
[0163] In reference to FIG. 14, the list of oligonucleotides for
synthesis can be rearranged or grouped for optimization of
synthesis. Thus at process step 574, the oligonucleotides are
grouped according to a factor on which to base the optimization of
synthesis. As illustrated in the Examples below, one such factor is
the 3' most nucleoside of the oligonucleotide. Using the amidite
approach for oligonucleotide synthesis, a nucleotide bearing a 3'
phosphoramite is added to the 5' hydroxyl group of a growing
nucleotide chain. The first nucleotide (at the 3' terminus of the
oligonucleotide-the 3' most nucleoside) is first connected to a
solid support. This is normally done batchwise on a large scale as
is standard practice during oligonucleotide synthesis.
[0164] Such solid supports pre-loaded with a nucleoside are
commercially available. In utilizing the multi well format for
oligonucleotide synthesis, for each oligonucleotide to be
synthesized, an aliquot of a solid support bearing the proper
nucleoside thereon is added to the well for synthesis. Prior to
loading the sequence of oligonucleotides to be synthesized in the
.seq file, they are sorted by the 3' terminal nucleotide. Based on
that sorting, all of the oligonucleotide sequences having an `A`
nucleoside at their 3' end are grouped together, those with a `C`
nucleoside are grouped together as are those with `G` or `T`
nucleosides. Thus in loading the nucleoside-bearing solid support
into the synthesis wells, machine movements are conserved.
[0165] The oligonucleotides can be grouped by the above described
parameter or other parameters that facilitate the synthesis of the
oligonucleotides. Thus in FIG. 14, sorting is noted as being
effected by some parameter of type 1, as for instance the above
described 3' most nucleoside, or other types of parameters from
type 2 to type n at process steps 576, 578 and 580. Since synthesis
will be from the 3' end of the oligonucleotides to the 5' end, the
oligonucleotide sequences are reverse sorted to read 3' to 5'. The
oligonucleotides are entered in the seq file in this form, i.e.,
reading 3' to 5'.
[0166] Once sorted into types, the position of the oligonucleotides
on the synthesis plates is specified at process step 582 by the
creation of a .seq file as described above. The .seq file is
associated with the respective .cmd and .tab files needed for
synthesis of the particular chemistries specified for the
oligonucleotides at process step 584 by retrieval of the .cmd and
.tab files at process step 586 from the sample database 520. These
files are then input into the multi well synthesizer at process
step 588 for oligonucleotide synthesis. Once physically
synthesized, the list of oligonucleotides again enters the general
procedure flow as indicated in FIG. 1. For shipping, storage or
other handling purposes, the plates can be lyophilized at this
point if desired. Upon lyophilization, each well contains the
oligonucleotides located therein as a dry compound.
14. Quality Control
[0167] In an optional step, quality control is performed on the
oligonucleotides at process step 600 after a decision is made
(decision step 550) to perform quality control. Although optional,
quality control may be desired when there is some reason to doubt
that some aspect of the synthetic process step 500 has been
compromised. Alternatively, samples of the oligonucleotides may be
taken and stored in the event that the results of assays conducted
using the oligonucleotides (process step 700) yield confusing
results or suboptimal data. In the latter event, for example,
quality control might be performed after decision step 800 if no
oligonucleotides with sufficient activity are identified. In either
event, decision step 650 follows quality control step process 600.
If one or more of the oligonucleotides do not pass quality control,
process step 500 can be repeated, i.e., the oligonucleotides are
synthesized for a second time.
[0168] The operation of the quality control system general
procedure 600 is detailed in steps 610-660 of FIG. 15. Also
referenced in the following discussion are the robotics and
associated analytical instrumentation as shown in FIG. 18.
[0169] During step 610 (FIG. 15), sterile, double-distilled water
is transferred by an automated liquid handler (2040 of FIG. 18) to
each well of a multi-well plate containing a set of lyophilized
antisense oligonucleotides. The automated liquid handler (2040 of
FIG. 18) reads the barcode sticker on the multi-well plate to
obtain the plate's identification number. Automated liquid handler
2040 then queries Sample Database 520 (which resides in Database
Server 2002 of FIG. 18) for the quality control assay instruction
set for that plate and executes the appropriate steps. Three
quality control processes are illustrated, however, it is
understood that other quality control processes or steps maybe
practiced in addition to or in place of the processes
illustrated.
[0170] The first illustrative quality control process (steps 622 to
626) quantitates the concentration of oligonucleotide in each well.
If this quality control step is performed, an automated liquid
handler (2040 of FIG. 18) is instructed to remove an aliquot from
each well of the master plate and generate a replicate daughter
plate for transfer to the UV spectrophotometer (2016 of FIG. 18).
The UV spectrophotometer (2016 of FIG. 18) then measures the
optical density of each well at a wavelength of 260 nanometers.
Using standardized conversion factors, a microprocessor within UV
spectrophotometer (2016 of FIG. 18) then calculates a concentration
value from the measured absorbance value for each well and output
the results to Sample Database 520.
[0171] The second illustrative quality control process steps 632 to
636) quantitates the percent of total oligonucleotide in each well
that is full length. If this quality control step is performed, an
automated liquid handler (2040 of FIG. 18) is instructed to remove
an aliquot from each well of the master plate and generate a
replicate daughter plate for transfer to the multichannel capillary
gel electrophoresis apparatus (2022 of FIG. 18). The apparatus
electrophoretically resolves in capillary tube gels the
oligonucleotide product in each well. As the product reaches the
distal end of the tube gel during electrophoresis, a detection
window dynamically measures the optical density of the product that
passes by it. Following electrophoresis, the value of percent
product that passed by the detection window with respect to time is
utilized by a built in microprocessor to calculate the relative
size distribution of oligonucleotide product in each well. These
results are then output to the Sample Database (520.
[0172] The third illustrative quality control process steps 632 to
636) quantitates the mass of total oligonucleotide in each well
that is full length. If this quality control step is performed, an
automated liquid handler (2040 of FIG. 18) is instructed to remove
an aliquot form each well of the master plate and generate a
replicate daughter plate for transfer to the multichannel liquid
electrospray mass spectrometer (2018 of FIG. 18). The apparatus
then uses electrospray technology to inject the oligonucleotide
product into the mass spectrometer. A built in microprocessor
calculates the mass-to-charge ratio to arrive at the mass of
oligonucleotide product in each well. The results are then output
to Sample Database 520.
[0173] Following completion of the selected quality control
processes, the output data is manually examined or is examined
using an appropriate algorithm and a decision is made as to whether
or not the plate receives `Pass` or `Fail` status. The current
criteria for acceptance is that at least 85% of the
oligonucleotides in a multi-well plate must be 85% or greater full
length product as measured by both capillary gel electrophoresis
and mass spectrometry. An input (manual or automated) is then made
into Sample Database 520 as to the pass/fail status of the plate.
If a plate fails, the process cycles back to step 500, and a new
plate of the same oligonucleotides is automatically placed in the
plate synthesis request queue (process 554 of FIG. 15). If a plate
receives `Pass` status, an automated liquid handler (2040 of FIG.
18) is instructed to remove appropriate aliquots from each well of
the master plate and generate two replicate daughter plates in
which the oligonucleotide in each well is at a concentration of 30
micromolar. The plate then moves on to process 700 for
oligonucleotide activity evaluation.
15. Cell Lines for Assaying Oligonucleotide Activity
[0174] The effect of antisense compounds on target nucleic acid
expression can be tested in any of a variety of cell types provided
that the target nucleic acid, or its gene product, is present at
measurable levels. This can be routinely determined using, for
example, PCR or Northern blot analysis. The following four cell
types are provided for illustrative purposes, but other cell types
can be routinely used.
[0175] T-24 cells: The transitional cell bladder carcinoma cell
line T-24 is obtained from the American Type Culture Collection
(ATCC) (Manassas, Va.). T-24 cells were routinely cultured in
complete McCoy's 5A basal media (Life Technologies, Gaithersburg,
Md.) supplemented with 10% fetal calf serum, penicillin 100 units
per milliliter, and streptomycin 100 micrograms per milliliter (all
from Life Technologies). Cells are routinely passaged by
trysinization and dilution when they reach 90% confluence. Cells
are routinely seeded into 96-well plates (Falcon-Primaria #3872) at
a density of 7000 cells/well for use in RT-PCR analysis. For
Northern blotting or other analysis, cells are seeded onto 100 mm
or other standard tissue culture plates and treated similarly,
using appropriate volumes of medium and oligonucleotide.
[0176] A549 cells: The human lung carcinoma cell line A549 is
obtained from the ATCC (Manassas, Va.). A549 cells were routinely
cultured in DMEM basal media (Life Technologies) supplemented with
10% fetal calf serum, penicillin 100 units per milliliter, and
streptomycin 100 micrograms per milliliter (all from Life
Technologies). Cells are routinely passaged by trysinization and
dilution when they reach 90% confluence.
[0177] NHDF cells: Human neonatal dermal fibroblast (NHDF) were
obtained from the Clonetics Corporation (Walkersville, Md.). NHDFs
were routinely maintained in Fibroblast Growth Medium (Clonetics
Corp.) as provided by the supplier. Cells are maintained for up to
10 passages as recommended by the supplier.
[0178] HEK cells: Human embryonic keratinocytes (HEK) were obtained
from the Clonetics Corp. HEKs were routinely maintained in
Keratinocyte Growth Medium (Clonetics Corp.) as provided by the
supplier. Cell are routinely maintained for up to 10 passages as
recommended by the supplier.
16. Treatment of Cells with Candidate Compounds
[0179] When cells reach about 80% confluency, they are treated with
oligonucleotide. For cells grown in 96-well plates, wells are
washed once with 200 .mu.l Opti-MEM-I.TM. reduced-serum medium
(Life Technologies) and then treated with 130 .mu.l of
Opti-MEM-I.TM. containing 3.75 .mu.g/ml LIPOFECTIN (Life
Technologies) and the desired oligonucleotide at a final
concentration of 150 nM. After 4 hours of treatment, the medium was
replaced with fresh medium. Cells were harvested 16 hours after
oligonucleotide treatment.
17. Assaying Oligonucleotide Activity
[0180] oligonucleotide-mediated modulation of expression of a
target nucleic acid can be assayed in a variety of ways known in
the art. For example, target RNA levels can be quantitated by,
e.g., Northern blot analysis, competitive PCR, or reverse
transcriptase polymerase chain reaction (RT-PCR). RNA analysis can
be performed on total cellular RNA or, preferably in the case of
polypeptide-encoding nucleic acids, poly(A)+mRNA. For RT-PCR,
poly(A)+mRNA is preferred. Methods of RNA isolation are taught in,
for example, Ausubel et al. (Short Protocols in Molecular Biology,
2nd Ed., pp. 4-1 to 4-13, Greene Publishing Associates and John
Wiley & Sons, New York, 1992). Northern blot analysis is
routine in the art (Id., pp. 4-14 to 4-29). Reverse transcriptase
polymerase chain reaction (RT-PCR) can be conveniently accomplished
using the commercially available ABI PRISM 7700 Sequence Detection
System (PE-Applied Biosystems, Foster City, Calif.) according to
manufacturer's instructions. Other methods of PCR are also known in
the art.
[0181] Target protein levels can be quantitated in a variety of
ways well known in the art, such as immunoprecipitation, Western
blot analysis (immunoblotting), Enzyme-linked immunosorbent assay
(ELISA) or fluorescence-activated cell sorting (FACS). Antibodies
directed to a protein encoded by a target nucleic acid can be
identified and obtained from a variety of sources, such as the MSRS
catalog of antibodies, (Aerie Corporation, Birmingham, Mich. or via
the internet at http://www.ANTIBODIESPROBES.com/), or can be
prepared via conventional antibody generation methods. Methods for
preparation of poly-clonal, monospecific (antipeptide`) and
monoclonal antisera are taught by, for example, Ausubel et al.
(Short Protocols in Molecular Biology, 2nd Ed., pp. 11-3 to 11-54,
Greene Publishing Associates and John Wiley & Sons, New York,
1992).
[0182] Immunoprecipitation methods are standard in the art and are
described by, for example, Ausubel et al. (Id., pp. 10-57 to
10-63). Western blot (immunoblot) analysis is standard in the art
(Id., pp. 10-32 to 10-10-35). Enzyme-linked immunosorbent assays
(ELISA) are standard in the art (Id., pp. 11-5 to 11-17).
[0183] Because it is preferred to assay the compounds of the
invention in a batchwise fashion, i.e., in parallel to the
automated synthesis process described above,. preferred means of
assaying are suitable for use in 96-well plates and with robotic
means. Accordingly, automated RT-PCR is preferred for assaying
target nucleic acid levels, and automated ELISA is preferred for
assaying target protein levels.
[0184] The assaying step, general procedure step 700, is described
in detail in FIG. 16. After an appropriate cell line is selected at
process step 710, a decision is made at decision step 714 as to
whether RT-PCR will be the only method by which the activity of the
compounds is evaluated. In some instances, it is desirable to run
alternative assay methods at process step 718; for example, when it
is desired to assess target polypeptide levels as well as target
RNA levels, an immunoassay such as an ELISA is run in parallel with
the RT-PCR assays. Preferably, such assays are tractable to
semi-automated or robotic means.
[0185] When RT-PCR is used to evaluate the activities of the
compounds, cells are plated into multi-well plates (typically,
96-well plates) in process step 720 and treated with test or
control oligonucleotides in process step 730. Then, the cells are
harvested and lysed in process step 740 and the lysates are
introduced into an apparatus where RT-PCR is carried out in process
step 750. A raw data file is generated, and the data is downloaded
and compiled at step 760. Spreadsheet files with data charts are
generated at process step 770, and the experimental data is
analyzed at process step 780. Based on the results, a decision is
made at process step 785 as to whether it is necessary to repeat
the assays and, if so, the process begins again with step 720. In
any event, data from all the assays on each oligonucleotide are
complied and statistical parameters are automatically deter-mined
at process step 790.
18. Classification of Compounds Based on Their Activity
[0186] Following assaying, general procedure step 700,
oligonucleotide compounds are classified according to one or more
desired properties. Typically, three classes of compounds are used:
active compounds, marginally active (or `marginal`) compounds and
inactive compounds. To some degree, the selection criteria for
these classes vary from target to target, and members of one or
more classes may not be present for a given set of
oligonucleotides.
[0187] However, some criteria are constant. For example, inactive
compounds will typically comprise those compounds having 5% or less
inhibition of target expression (relative to basal levels). Active
compounds will typically cause at least 30% inhibition of target
expression, although lower levels of inhibition are acceptable in
some instances. Marginal compounds will have activities
intermediate between active and inactive compounds, with preferred
marginal compounds having activities more like those of active
compounds.
19. Optimization of Lead Compounds by Sequence
[0188] One means by which oligonucleotide compounds are optimized
for activity is by varying their nucleobase sequences so that
different regions of the target nucleic acid are targeted. Some
such regions will be more accessible to oligonucleotide compounds
than others, and `sliding` a nucleobase sequence along a target
nucleic acid only a few bases can have significant effects on
activity. Accordingly, varying or adjusting the nucleobase
sequences of the compounds of the invention is one means by which
suboptimal compounds can be made optimal, or by which new active
compounds can be generated.
[0189] The operation of the gene walk process 1100 detailed in
steps 1104-1112 of FIG. 17 is detailed as follows. As used herein,
the term `gene walk` is defined as the process by which a specified
oligonucleotide sequence x that binds to a specified nucleic acid
target y is used as a frame of reference around which a series of
new oligonucleotides sequences capable of hybridizing to nucleic
acid target y are generated that are sequence shifted increments of
oligonucleotide sequence x. Gene walking can be done "down-stream",
`upstream` or in both directions from a specified
oligonucleotide.
[0190] During step 1104 the user manually enters the identification
number of the oligonucleotide sequence around which it is desired
to execute gene walk process 1100 and the name of the corresponding
target nucleic acid. The user then enters the scope of the gene
walk at step 1104, by which is meant the number of oligonucleotide
sequences that it is desired to generate. The user then enters in
step 1108 a positive integer value for the sequence shift
increment. Once this data is generated, the gene walk is effected.
This causes a subroutine to be executed that automatically
generates the desired list of sequences by walking along the target
sequence. At that point, the user proceeds to process 400 to assign
chemistries to the selected oligonucleotides.
[0191] Example 16 below, details a gene walk. In subsequent steps,
this new set of nucleobase sequences generated by the gene walk is
used to direct the automated synthesis at general procedure step
500 of a second set of candidate oligonucleotides. These compounds
are then taken through subsequent process steps to yield active
compounds or reiterated as necessary to optimize activity of the
compounds.
20. Optimization of Lead Compounds by Chemistry
[0192] Another means by which oligonucleotide compounds of the
invention are optimized is by reiterating portions of the process
of the invention using marginal compounds from the first iteration
and selecting additional chemistries to the nucleobase sequences
thereof.
[0193] Thus, for example, an oligonucleotide chemistry different
from that of the first set of oligonucleotides is assigned at
general procedure step 400. The nucleobase sequences of marginal
compounds are used to direct the synthesis at general procedure
step 500 of a second set of oligonucleotides having the second
assigned chemistry. The resulting second set of oligonucleotide
compounds is assayed in the same manner as the first set at
procedure process step 700 and the results are examined to
determine if compounds having sufficient activity have been
generated at decision step 800.
21. Identification of Sites Amenable to Antisense Technologies
[0194] In a related process, a second oligonucleotide chemistry is
assigned at procedure step 400 to the nucleobase sequences of all
of the oligonucleotides (or, at least, all of the active and
marginal compounds) and a second set of oligonucleotides is
synthesized at procedure step 500 having the same nucleobase
sequences as the first set of compounds. The resulting second set
of oligonucleotide compounds is assayed in the same manner as the
first set at procedure step 700 and active and marginal compounds
are identified at procedure steps 800 and 1000.
[0195] In order to identify sites on the target nucleic acid that
are amenable to a variety of antisense technologies, the following
mathematically simple steps are taken. The sequences of active and
marginal compounds from two or more such automated syntheses/assays
are compared and a set of nucleobase sequences that are active, or
marginally so, in both sets of compounds is identified. The reverse
complements of these nucleobase sequences corresponds to sequences
of the target nucleic acid that are tractable to a variety of
antisense and other sequence-based technologies. These
antisense-sensitive sites are assembled into contiguous sequences
(contigs) using the procedures described for assembling target
nucleotide sequences (at procedure step 200).
22. Systems for Executing Preferred Methods of the Invention
[0196] An embodiment of computer, network and instrument resources
for effecting the methods of the invention is shown in FIG. 18. In
this embodiment, four computer servers are provided. First, a large
database server 2002 stores all chemical structure, sample tracking
and genomic, assay, quality control, and program status data.
Further, this database server serves as the platform for a document
management system. Second, a compute engine 2004 runs computational
programs including RNA folding, oligonucleotide walking, and
genomic searching. Third, a file server 2006 allows raw instrument
output storage and sharing of robot instructions. Fourth, a
groupware server 2008 enhances staff communication and process
scheduling.
[0197] A redundant high-speed network system is provided between
the main servers and the bridges 2026, 2028 and 2030. These bridges
provide reliable network access to the many workstations and
instruments deployed for this process. The instruments selected to
support this embodiment are all designed to sample directly from
standard 96 well microtiter plates, and include an optical density
reader 2016, a combined liquid chromatography and mass spectroscopy
instrument 2018, a gel fluorescence and scintillation imaging
system 2032 and 2042, a capillary gel electrophoreses system 2022
and a real-time PCR system 2034.
[0198] Most liquid handling is accomplished automatically using
robots with individually controllable robotic pipetters 2038 and
2020 as well as a 96-well pipette system 2040 for duplicating
plates. Windows NT or Macintosh workstations 2044, 2024, and 2036
are deployed for instrument control, analysis and productivity
support.
23. Relational Database
[0199] Data is stored in an appropriate database. For use with the
methods of the invention, a relational database is preferred. FIG.
19 illustrates the data structure of a sample relational database.
Various elements of data are segregated among linked storage
elements of the database.
EXAMPLES
[0200] The following examples illustrate the invention and are not
intended to limit the same. Those skilled in the art will
recognize, or be able to ascertain through routine experimentation,
numerous equivalents to the specific procedures, materials and
devices described herein. Such equivalents are considered to be
within the scope of the present invention.
Example 1
Selection of CD40 as a Target
[0201] Cell-cell interactions are a feature of a variety of
biological processes. In the activation of the immune response, for
example, one of the earliest detectable events in a normal
inflammatory response is adhesion of leukocytes to the vascular
endothelium, followed by migration of leukocytes out of the
vasculature to the site of infection or injury. The adhesion of
leukocytes to vascular endothelium is an obligate step in their
migration out of the vasculature (for a review, see Albelda et al.,
FASEB J., 1994, 8, 504). As is well known in the art, cell-cell
interactions are also critical for propagation of both
B-lymphocytes and T-lymphocytes resulting in enhanced humoral and
cellular immune responses, respectively (for a reviews, see Makgoba
et al., Immunol. Today, 1989, 10, 417; Janeway, Sci. Amer., 1993,
269, 72).
[0202] CD40 was first characterized as a receptor expressed on
B-lymphocytes. It was later found that engagement of B-cell CD40
with CD40L expressed on activated T-cells is essential for T-cell
dependent B-cell activation (i.e. proliferation, immunoglobulin
secretion, and class switching) (for a review, see Gruss et al.
Leuk. Lymphoma, 1997, 24, 393). A full cDNA sequence for CD40 is
available (GenBank accession number X60592, incorporated herein as
SEQ ID NO:85).
[0203] As interest in CD40 mounted, it was subsequently revealed
that functional CD40 is expressed on a variety of cell types other
than B-cells, including macrophages, dendritic cells, thymic
epithelial cells, Langerhans cells, and endothelial cells (Ibid.).
These studies have led to the current belief that CD40 plays a much
broader role in immune regulation by mediating interactions of
T-cells with cell types other than B-cells. In support of this
notion, it has been shown that stimulation of CD40 in macrophages
and dendritic results is required for T-cell activation during
antigen presentation (Id.). Recent evidence points to a role for
CD40 in tissue inflammation as well. Production of the inflammatory
mediators IL-12 and nitric oxide by macrophages has been shown to
be CD40 dependent (Buhlmann et al., J. Clin. Immunol., 1996, 16,
83). In endothelial cells, stimulation of CD40 by CD40L has been
found to induce surface expression of E-selectin, ICAM-1, and
VCAM-1, promoting adhesion of leukocytes to sites of inflammation
(Buhlmann et al., J. Clin. Immunol, 1996, 16, 83; Gruss et al.,
Leuk Lymphoma, 1997, 24, 393). Finally, a number of reports have
documented overexpression of CD40 in epithelial and hematopoietic
tumors as well as tumor infiltrating endothelial cells, indicating
that CD40 may play a role in tumor growth and/or angiogenesis as
well (Gruss et al., Leuk Lymphoma, 1997, 24, 393-422; Kluth et al.
Cancer Res, 1997, 57, 891).
[0204] Due to the pivotal role that CD40 plays in humoral immunity,
the potential exists that therapeutic strategies aimed at
downregulating CD40 may provide a novel class of agents useful in
treating a number of immune associated disorders, including but not
limited to graft versus host disease, graft rejection, and
autoimmune diseases such as multiple sclerosis, systemic lupus
erythematosus, and certain forms of arthritis. Inhibitors of CD40
may also prove useful as an anti-inflammatory compound, and could
therefore be useful as treatment for a variety of diseases with an
inflammatory component such as asthma, rheumatoid arthritis,
allograft rejections, inflammatory bowel disease, and various
dermatological conditions, including psoriasis. Finally, as more is
learned about the association between CD40 overexpression and tumor
growth, inhibitors of CD40 may prove useful as anti-tumor agents as
well.
[0205] Currently, there are no known therapeutic agents which
effectively inhibit the synthesis of CD40. To date, strategies
aimed at inhibiting CD40 function have involved the use of a
variety of agents that disrupt CD40/CD40L binding. These include
monoclonal antibodies directed against either CD40 or CD40L,
soluble forms of CD40, and synthetic peptides derived from a second
CD40 binding protein, A20. The use of neutralizing antibodies
against CD40 and/or CD40L in animal models has provided evidence
that inhibition of CD40 stimulation would have therapeutic benefit
for GVHD, allograft rejection, rheumatoid arthritis, SLE, MS, and
B-cell lymphoma (Buhlmann et al., J. Clin. Immunol, 1996, 16, 83).
However, due to the expense, short half-life, and bioavailability
problems associated with the use of large proteins as therapeutic
agents, there is a long felt need for additional agents capable of
effectively inhibiting CD40 function. oligonucleotides compounds
avoid many of the pitfalls of current agents used to block
CD40/CD40L interactions and may therefore prove to be uniquely
useful in a number of therapeutic applications.
Example 2
Generation of Virtual Oligonucleotides Targeted to CD40
[0206] The process of the invention was used to select
oligonucleotides targeted to CD40, generating the list of
oligonucleotide sequences with desired properties as shown in FIG.
22. From the assembled CD40 sequence, the process began with
determining the desired oligonucleotide length to be eighteen
nucleotides, as represented in step 2500. All possible
oligonucleotides of this length were generated by Oligo 5.0.TM., as
represented in step 2504. Desired thermodynamic properties were
selected in step 2508. The single parameter used was
oligonucleotides of melting temperature less than or equal to
40.degree. C. were discarded. In step 2512, oligonucleotide melting
temperatures were calculated by Oligo 5.0.TM.. Oligonucleotide
sequences possessing an undesirable score were discarded. It is
believed that oligonucleotides with melting temperatures near or
below physiological and cell culture temperatures will bind poorly
to target sequences. All oligonucleotide sequences remaining were
exported into a spreadsheet. In step 2516, desired sequence
properties are selected. These include discarding oligonucleotides
with at least one stretch of four guanosines in a row and stretches
of six of any other nucleotide in a row. In step 2520, a
spreadsheet macro removed all oligonucleotides containing the text
string `GGGG`. In step 2524, another spreadsheet macro removed all
oligonucleotides containing the text strings `AAAAAA` or `CCCCCC`
or `TTTTTT`. From the remaining oligonucleotide sequences, 84
sequences were selected manually with the criteria of having an
uniform distribution of oligonucleotide sequences throughout the
target sequence, as represented in step 2528. These oligonucleotide
sequences were then passed to the next step in the process,
assigning actual oligonucleotide chemistries to the sequences.
Example 3
Input Files for Automated Oligonucleotide Synthesis
[0207] Command File (.cmd File)
[0208] Table 2 is a command file for synthesis of oligonucleotide
having regions of 2'-O-(methoxyethyl) nucleosides and region of
2'-deoxy nucleosides each linked by phosphorothioate intemucleotide
linkages.
4 TABLE 2 SOLD_SUPPORT_SKIP BEGIN Next_Sequence END INITIAL-WASH
BEGIN Add ACN 300 Drain 10 END LOOP-BEGIN DEBLOCK BEGIN Prime TCA
Load Tray Repeat 2 Add TCA 150 Wait 10 Drain 8 End_Repeat Remove
Tray Add TCA 125 Wait 10 Drain 8 END WASH_AFTER_DEBLOCK BEGIN
Repeat 3 Add ACN 250 To_All Drain 10 End_Repeat END COUPLING BEGIN
if class = DEOXY_THIOATE Nozzle wash <act1> prime
<act1> prime <seq> Add <act1> 70 + <seq> 70
Wait 40 Drain 5 end-if if class = MOE_THIOATE Nozzle wash
<act1> Prime <act1> prime <seq> Add <act1>
120 + <seq> 120 Wait 230 Drain 5 End_if END
WASH_AFTER_COUPLING BEGIN Add ACN 200 To_All Drain 10 END OXIDIZE
BEGIN if class = DEOXY_THIOATE Add BEAU 180 Wait 40 Drain 7 end_if
if class = MOE_THIOATE Add BEAU 200 Wait 120 Drain 7 end_if END CAP
BEGIN Add CAP_B 80 + CAP_A 80 Wait 20 Drain 7 END WASH_AFTER_CAP
BEGIN Add ACN 150 To_All Drain 5 Add ACN 250 To_All Drain 11 END
BASE_COUNTER BEGIN Next_Sequence END LOOP_END DEBLOCK_FINAL BEGIN
Prime TCA Load Tray Repeat 2 Add TCA 150 To_All Wait 10 Drain 8
End_Repeat Remove Tray Add TCA 125 To_All Wait 10 Drain 10 END
FINAL_WASH BEGIN Repeat 4 Add ACN 300 to_All Drain_12 End_Repeat
END ENDALL BEGIN Wait 3 END
[0209] Sequence Files (.seq Files)
[0210] Table 3 is a seq file for oligonucleotides having 2'-deoxy
nucleosides linked by phosphorothioate internucleotide
linkages.
5TABLE 3 Identity of columns: Syn #, Well, Scale, Nucleotide at
particular position (identified using base identifier followed by
backbone identifier where `s` is phosphorothioate). Note the
columns wrap around to next line when longer than one line. 1 A01
200 As Cs Cs As Gs Gs As Cs Gs Gs Cs Gs Gs As Cs Cs As Gs 2 A02 200
As Cs Gs Gs Cs Gs Gs As Cs Cs As Gs As Gs Ts Gs Gs As 3 A03 200 As
Cs Cs As As Gs Cs As Gs As Cs Gs Gs As Gs As Cs Gs 4 A04 200 As Gs
Gs As Gs As Cs Cs Cs Cs Gs As Cs Gs As As Cs Gs 5 A05 200 As Cs Cs
Cs Cs Gs As Cs Gs As As Cs Gs As Cs Ts Gs Gs 6 A06 200 As Cs Gs As
As Cs Gs As Cs Ts Gs Gs Cs Gs As Cs As Gs 7 A07 200 As Cs Gs As Cs
Ts Gs Gs Cs Gs As Cs As Gs Gs Ts As Gs 8 A08 200 As Cs As Gs Gs Ts
As Gs Gs Ts Cs Ts Ts Gs Gs Ts Gs Gs 9 A09 200 As Gs Gs Ts Cs Ts Ts
Gs Gs Ts Gs Gs Gs Ts Gs As Cs Gs 10 A10 200 As Gs Ts Cs As Cs Gs As
Cs As As Gs As As As Cs As Cs 11 A11 200 As Cs Gs As Cs As As Gs As
As As Cs As Cs Gs Gs Ts Cs 12 A12 200 As Gs As As As Cs As Cs Gs Gs
Ts Cs Gs Gs Ts Cs Cs Ts 13 B01 200 As As Cs As Cs Gs Gs Ts Cs Gs Gs
Ts Cs Cs Ts Gs Ts Cs 14 B02 200 As Cs Ts Cs As Cs Ts Gs As Cs Gs Ts
Gs Ts Cs Ts Cs As 15 B03 200 As Cs Gs Gs As As Gs Gs As As Cs Gs Cs
Cs As Cs Ts Ts 16 B04 200 As Ts Cs Ts Gs Ts Gs Gs As Cs Cs Ts Ts Gs
Ts Cs Ts Cs 17 B05 200 As Cs As Cs Ts Ts Cs Ts Ts Cs Cs Gs As Cs Cs
Gs Ts Gs 18 B06 200 As Cs Ts Cs Ts Cs Gs As Cs As Cs As Gs Gs As Cs
Gs Ts 19 B07 200 As As As Cs Cs Cs Cs As Gs Ts Ts Cs Gs Ts Cs Ts As
As 20 B08 200 As Ts Gs Ts Cs Cs Cs Cs As As As Gs As Cs Ts As Ts Gs
21 B09 200 As Cs Gs Cs Ts Cs Gs Gs Gs As Cs Gs Gs Gs Ts Cs As Gs 22
B10 200 As Gs Cs Cs Gs As As Gs As As Gs As Gs Gs Ts Ts As Cs 23
B11 200 As Cs As Cs As Gs Ts As Gs As Cs Gs As As As Gs Cs Ts 24
B12 200 As Cs As Cs Ts Cs Ts Gs Gs Ts Ts Ts Cs Ts Gs Gs As Cs 25
C01 200 As Cs Gs As Cs Cs As Gs As As As Ts As Gs Ts Ts Ts Ts 26
C02 200 As Gs Ts Ts As As As As Gs Gs Gs Cs Ts Gs Cs Ts As Gs 27
C03 200 As Gs Gs Ts Ts Gs Ts Gs As Cs Gs As Cs Gs As Gs Gs Ts 28
C04 200 As As Ts Gs Ts As Cs Cs Ts As Gs Gs Cs Ts Ts Gs Gs Cs 29
C05 200 As Gs Ts Cs As Cs Gs Ts Cs Cs Ts Cs Ts Cs Ts Gs Ts Cs 30
C06 200 Cs Ts Gs Gs Cs Gs As Cs As Gs Gs Ts As Gs Gs Ts Cs Ts 31
C07 200 Cs Ts Cs Ts Gs Ts Gs Ts Gs As Cs Gs Gs Ts Gs Gs Ts Cs 32
C08 200 Cs As Gs Gs Ts Cs Gs Ts Cs Ts Ts Cs Cs Cs Gs Ts Gs Gs 33
C09 200 Cs Ts Gs Ts Gs Gs Ts As Gs As Cs Gs Ts Gs Gs As Cs As 34
C10 200 Cs Ts As As Cs Gs As Ts Gs Ts Cs Cs Cs Cs As As As Gs 35
C11 200 Cs Ts Gs Ts Ts Cs Gs As Cs As Cs Ts Cs Ts Gs Gs Ts Ts 36
C12 200 Cs Ts Gs Gs As Cs Cs As As Cs As Cs Gs Ts Ts Gs Ts Cs 37
D01 200 Cs Cs Gs Ts Cs Cs Gs Ts Gs Ts Ts Ts Gs Ts Ts Cs Ts Gs 38
D02 200 Cs Ts Gs As Cs Ts As Cs As As Cs As Gs As Cs As Cs Cs 39
D03 200 Cs As As Cs As Gs As Cs As Cs Cs As Gs Gs Gs Gs Ts Cs 40
D04 200 Cs As Gs Gs Gs Gs Ts Cs Cs Ts As Gs Cs Cs Gs As Cs Ts 41
D05 200 Cs Ts Cs Ts As Gs Ts Ts As As As As Gs Gs Gs Cs Ts Gs 42
D06 200 Cs Ts Gs Cs Ts As Gs As As Gs Gs As Cs Cs Gs As Gs Gs 43
D07 200 Cs Ts Gs As As As Ts Gs Ts As Cs Cs Ts As Cs Gs Gs Ts 44
D08 200 Cs As Cs Cs Cs Gs Ts Ts Ts Gs Ts Cs Cs Gs Ts Cs As As 45
D09 200 Cs Ts Cs Gs As Ts As Cs Gs Gs Gs Ts Cs As Gs Ts Cs As 46
D10 200 Gs Gs Ts As Gs Gs Ts Cs Ts Ts Gs Gs Ts Gs Gs Gs Ts Gs 47
D11 200 Gs As Cs Ts Ts Ts Gs Cs Cs Ts Ts As Cs Gs Gs As As Gs 48
D12 200 Gs Ts Gs Gs As Gs Ts Cs Ts Ts Ts Gs Ts Cs Ts Gs Ts Gs 49
E01 200 Gs Gs As Gs Ts Cs Ts Ts Ts Gs Ts Cs Ts Gs Ts Gs Gs Ts 50
E02 200 Gs Gs As Cs As Cs Ts Cs Ts Cs Gs As Cs As Cs As Gs Gs 51
E03 200 Gs As Cs As Cs As Gs Gs As Cs Gs Ts Gs Gs Cs Gs As Gs 52
E04 200 Gs As Gs Ts As Cs Gs As Gs Cs Gs Gs Gs Cs Cs Gs As As 53
E05 200 Gs As Cs Ts As Ts Gs Gs Ts As Gs As Cs Gs Cs Ts Cs Gs 54
E06 200 Gs As As Gs As Gs Gs Ts Ts As Cs As Cs As Gs Ts As Gs 55
E07 200 Gs As Gs Gs Ts Ts As Cs As Cs As Gs Ts As Gs As Cs Gs 56
E08 200 Gs Ts Ts Gs Ts Cs Cs Gs Ts Cs Cs Gs Ts Gs Ts Ts Ts Gs 57
E09 200 Gs As Cs Ts Cs Ts Cs Gs Gs Gs As Cs Cs As Cs Cs As Cs 58
E10 200 Gs Ts As Gs Gs As Gs As As Cs Cs As Cs Gs As Cs Cs As 59
E11 200 Gs Gs Ts Ts Cs Ts Ts Cs Gs Gs Ts Ts Gs Gs Ts Ts As Ts 60
E12 200 Gs Ts Gs Gs Gs Gs Ts Ts Cs Gs Ts Cs Cs Ts Ts Gs Gs Gs 61
F01 200 Gs Ts Cs As Cs Gs Ts Cs Cs Ts Cs Ts Gs As As As Ts Gs 62
F02 200 Gs Ts Cs Cs Ts Cs Cs Ts As Cs Cs Gs Ts Ts Ts Cs Ts Cs 63
F03 200 Gs Ts Cs Cs Cs Cs As Cs Gs Ts Cs Cs Gs Ts Cs Ts Ts Cs 64
F04 200 Ts Cs As Cs Cs As Gs Gs As Cs Gs Gs Cs Gs Gs As Cs Cs 65
F05 200 Ts As Cs Cs As As Gs Cs As Gs As Cs Gs Gs As Gs As Cs 66
F06 200 Ts Cs Cs Ts Gs Ts Cs Ts Ts Ts Gs As Cs Cs As Cs Ts Cs 67
F07 200 Ts Gs Ts Cs Ts Ts Ts Gs As Cs Cs As Cs Ts Cs As Cs Ts 68
F08 200 Ts Gs As Cs Cs As Cs Ts Cs As Cs Ts Gs As Cs Gs Ts Gs 69
F09 200 Ts Gs As Cs Gs Ts Gs Ts Cs Ts Cs As As Gs Ts Gs As Cs 70
F10 200 Ts Cs As As Gs Ts Gs As Cs Ts Ts Ts Gs Cs Cs Ts Ts As 71
F11 200 Ts Gs Ts Ts Ts As Ts Gs As Cs Gs Cs Ts Gs Gs Gs Gs Ts 72
F12 200 Ts Ts As Ts Gs As Cs Gs Cs Ts Gs Gs Gs Gs Ts Ts Gs Gs 73
G01 200 Ts Gs As Cs Gs Cs Ts Gs Gs Gs Gs Ts Ts Gs Gs As Ts Cs 74
G02 200 Ts Cs Gs Ts Cs Ts Ts Cs Cs Cs Gs Ts Gs Gs As Gs Ts Cs 75
G03 200 Ts Gs Gs Ts As Gs As Cs Gs Ts Gs Gs As Cs As Cs Ts Ts 76
G04 200 Ts Ts Cs Ts Ts Cs Cs Gs As Cs Cs Gs Ts Gs As Cs As Ts 77
G05 200 Ts Gs Gs Ts As Gs As Cs Gs Cs Ts Cs Gs Gs Gs As Cs Gs 78
G06 200 Ts As Gs As Cs Gs Cs Ts Cs Gs Gs Gs As Cs Gs Gs Gs Ts 79
G07 200 Ts Ts Ts Ts As Cs As Gs Ts Gs Gs Gs As As Cs Cs Ts Gs 80
G08 200 Ts Gs Gs Gs As As Cs Cs Ts Gs Ts Ts Cs Gs As Cs As Cs 81
G09 200 Ts Cs Gs Gs Gs As Cs Cs As Cs Cs As Cs Ts As Gs Gs Gs 82
G10 200 Ts As Gs Gs As Cs As As As Cs Gs Gs Ts As Gs Gs As Cs 83
G11 200 Ts Gs Cs Ts As Gs As As Gs Gs As Cs Cs Gs As Gs Gs Ts 84
G12 200 Ts Cs Ts Gs Ts Cs As Cs Ts Cs Cs Gs As Cs Gs Ts Gs Gs
[0211] Table 4 is a .seq file for oligonucleotides having regions
of 2'-O-methoxyethyl)nucleosides and region of 2'-deoxy nucleosides
each linked by phosphorothioate inter-nucleotide linkages.
6TABLE 4 Identity of columns: Syn #, Well, Scale, Nucleotide at
particular position (identified using base identifier followed by
backbone identifier where `s` is phosphorothioate and `moe`
indicated a 2'-O-(methoxyethy) substituted nucleoside). The columns
wrap around to next line when longer than one line. 1 A01 200 moeAs
moeCs moeCs moeAs Gs Gs As Cs Gs Gs Cs Gs Gs As moeCs moeCs moeAs
moeGs 2 A02 200 moeAs moeCs moeGs moeGs Cs Gs Gs As Cs Cs As Gs As
Gs moeTs moeGs moeGs moeAs 3 A03 200 moeAs moeCs moeCs moeAs As Gs
Cs As Gs As Cs Gs Gs As moeGs moeAs moeCs moeGs 4 A04 200 moeAs
moeGs moeGs moeAs Gs As Cs Cs Cs Cs Gs As Cs Gs moeAs moeAs moeCs
moeGs 5 A05 200 moeAs moeCs moeCs moeCs Cs Gs As Cs Gs As As Cs Gs
As moeCs moeTs moeGs moeGs 6 A06 200 moeAs moeCs moeGs moeAs As Cs
Gs As Cs Ts Gs Gs Cs Gs moeAs moeCs moeAs moeGs 7 A07 200 moeAs
moeCs moeGs moeAs Cs Ts Gs Gs Cs Gs As Cs As Gs moeGs moeTs moeAs
moeGs 8 A08 200 moeAs moeCs moeAs moeGs Gs Ts As Gs Gs Ts Cs Ts Ts
Gs moeGs moeTs moeGs moeGs 9 A09 200 moeAs moeGs moeGs moeTs Cs Ts
Ts Gs Gs Ts Gs Gs Gs Ts moeGs moeAs moeCs moeGs 10 A10 200 moeAs
moeGs moeTs moeCs As Cs Gs As Cs As As Gs As As moeAs moeCs moeAs
moeCs 11 A11 200 moeAs moeCs moeGs moeAs Cs As As Gs As As As Cs As
Cs moeGs moeGs moeTs moeCs 12 A12 200 moeAs moeGs moeAs moeAs As Cs
As Cs Gs Gs Ts Cs Gs Gs moeTs moeCs moeCs moeTs 13 B01 200 moeAs
moeAs moeCs moeAs Cs Gs Gs Ts Cs Gs Gs Ts Cs Cs moeTs moeGs moeTs
moeCs 14 B02 200 moeAs moeCs moeTs moeCs As Cs Ts Gs As Cs Gs Ts Gs
Ts moeCs moeTs moeCs moeAs 15 B03 200 moeAs moeCs moeGs moeGs As As
Gs Gs As As Cs Gs Cs Cs moeAs moeCs moeTs moeTs 16 B04 200 moeAs
moeTs moeCs moeTs Gs Ts Gs Gs As Cs Cs Ts Ts Gs moeTs moeCs moeTs
moeCs 17 B05 200 moeAs moeCs moeAs moeCs Ts Ts Cs Ts Ts Cs Cs Gs As
Cs moeCs moeGs moeTs moeGs 18 B06 200 moeAs moeCs moeTs moeCs Ts Cs
Gs As Cs As Cs As Gs Gs moeAs moeCs moeGs moeTs 19 B07 200 moeAs
moeAs moeAs moeCs Cs Cs Cs As Gs Ts Ts Cs Gs Ts moeCs moeTs moeAs
moeAs 20 B08 200 moeAs moeTs moeGs moeTs Cs Cs Cs Cs As As As Gs As
Cs moeTs moeAs moeTs moeCs 21 B09 200 moeAs moeCs moeGs moeCs Ts Cs
Gs Gs Gs As Cs Gs Gs Gs moeTs moeCs moeAs moeGs 22 B10 200 moeAs
moeGs moeCs moeCs Gs As As Gs As As Gs As Gs Gs moeTs moeTs moeAs
moeCs 23 B11 200 moeAs moeCs moeAs moeCs As Gs Ts As Gs As Cs Gs As
As moeAs moeGs moeCs moeTs 24 B12 200 moeAs moeCs moeAs moeCs Ts Cs
Ts Gs Gs Ts Ts Ts Cs Ts moeGs moeGs moeAs moeCs 25 C01 200 moeAs
moeCs moeGs moeAs Cs Cs As Gs As As As Ts As Gs moeTs moeTs moeTs
moeTs 26 C02 200 moeAs moeGs moeTs moeTs As As As As Gs Gs Gs Gs Ts
Gs moeCs moeTs moeAs moeGs 27 C03 200 moeAs moeGs moeGs moeTs Ts Gs
Ts Gs As Cs Gs As Cs Gs moeAs moeGs moeGs moeTs 28 C04 200 moeAs
moeAs moeTs moeGs Ts As Cs Cs Ts As Cs Gs Gs Ts moeTs moeGs moeGs
moeCs 29 C05 200 moeAs moeGs moeTs moeCs As Cs Gs Ts Cs Cs Ts Cs Ts
Cs moeTs moeGs moeTs moeCs 30 C06 200 moeCs moeTs moeGs moeGs Cs Gs
As Cs As Gs Gs Ts As Gs moeGs moeTs moeCs moeTs 31 C07 200 moeCs
moeTs moeCs moeTs Gs Ts Gs Ts Gs As Cs Gs Gs Ts moeGs moeGs moeTs
moeCs 32 C08 200 moeCs moeAs moeGs moeGs Ts Cs Gs Ts Cs Ts Ts Cs Cs
Cs moeGs moeTs moeGs moeGs 33 C09 200 moeCs moeTs moeGs moeTs Gs Gs
Ts As Gs As Cs Gs Ts Gs moeGs moeAs moeCs moeAs 34 C10 200 moeCs
moeTs moeAs moeAs Cs Gs As Ts Gs Ts Cs Cs Cs Cs moeAs moeAs moeAs
moeGs 35 C11 200 moeCs moeTs moeGs moeTs Ts Cs Gs As Cs As Cs Ts Cs
Ts moeGs moeGs moeTs moeTs 36 C12 200 moeCs moeTs moeGs moeGs As Cs
Cs As As Cs As Cs Gs Ts moeTs moeGs moeTs moeCs 37 D01 200 moeCs
moeCs moeGs moeTs Cs Cs Gs Ts Gs Ts Ts Ts Gs Ts moeTs moeCs moeTs
moeGs 38 D02 200 moeCs moeTs moeGs moeAs Cs Ts As Cs As As Cs As Gs
As moeCs moeAs moeCs moeCs 39 D03 200 moeCs moeAs moeAs moeCs As Gs
As Cs As Cs Cs As Gs Gs moeGs moeGs moeTs moeCs 40 D04 200 moeCs
moeAs moeGs moeGs Gs Gs Ts Cs Cs Ts As Gs Cs Cs moeGs moeAs moeCs
moeTs 41 D05 200 moeCs moeTs moeCs moeTs As Gs Ts Ts As As As As Gs
Gs moeGs moeCs moeTs moeGs 42 D06 200 moeCs moeTs moeGs moeCs Ts As
Gs As As Gs Gs As Cs Cs moeGs moeAs moeGs moeGs 43 D07 200 moeCs
moeTs moeGs moeAs As As Ts Gs Ts As Cs Cs Ts As moeCs moeGs moeGs
moeTs 44 D08 200 moeCs moeAs moeCs moeCs Cs Gs Ts Ts Ts Gs Ts Cs Cs
Gs moeTs moeCs moeAs moeAs 45 D09 200 moeCs moeTs moeCs moeGs As Ts
As Cs Gs Gs Gs Ts Cs As moeGs moeTs moeCs moeAs 46 D10 200 moeGs
moeGs moeTs moeAs Gs Gs Ts Cs Ts Ts Gs Gs Ts Gs moeGs moeGs moeTs
moeGs 47 D11 200 moeGs moeAs moeCs moeTs Ts Ts Gs Cs Cs Ts Ts As Cs
Gs moeGs moeAs moeAs moeGs 48 D12 200 moeGs moeTs moeGs moeGs As Gs
Ts Cs Ts Ts Ts Gs Ts Cs moeTs moeGs moeTs moeGs 49 E01 200 moeGs
moeGs moeAs moeGs Ts Cs Ts Ts Ts Gs Ts Cs Ts Gs moeTs moeGs moeGs
moeTs 50 E02 200 moeGs moeGs moeAs moeCs As Cs Ts Cs Ts Cs Gs As Cs
As moeCs moeAs moeGs moeGs 51 E03 200 moeGs moeAs moeCs moeAs Cs As
Gs Gs As Cs Gs Ts Gs Gs moeCs moeGs moeAs moeGs 52 E04 200 moeGs
moeAs moeGs moeTs As Cs Gs As Gs Cs Gs Gs Gs Cs moeCs moeGs moeAs
moeAs 53 E05 200 moeGs moeAs moeCs moeTs As Ts Gs Gs Ts As Gs As Cs
Gs moeCs moeTs moeCs moeGs 54 E06 200 moeGs moeAs moeAs moeGs As Gs
Gs Ts Ts As Cs As Cs As moeGs moeTs moeAs moeGs 55 E07 200 moeGs
moeAs moeGs moeGs Ts Ts As Cs As Cs As Gs Ts As moeGs moeAs moeCs
moeGs 56 E08 200 moeGs moeTs moeTs moeGs Ts Cs Cs Gs Ts Cs Cs Gs Ts
Gs moeTs moeTs moeTs moeGs 57 E09 200 moeGs moeAs moeCs moeTs Cs Ts
Cs Gs Gs Gs As Cs Cs As moeCs moeCs moeAs moeCs 58 E10 200 moeGs
moeTs moeAs moeGs Gs As Gs As As Cs Cs As Cs Gs moeAs moeCs moeCs
moeAs 59 E11 200 moeGs moeGs moeTs moeTs Cs Ts Ts Cs Gs Gs Ts Ts Gs
Gs moeTs moeTs moeAs moeTs 60 E12 200 moeGs moeTs moeGs moeGs Gs Gs
Ts Ts Cs Gs Ts Cs Cs Ts moeTs moeGs moeGs moeGs 61 F01 200 moeCs
moeTs moeCs moeAs Cs Gs Ts Cs Cs Ts Cs Ts Gs As moeAs moeAs moeTs
moeGs 62 F02 200 moeGs moeTs moeCs moeCs Ts Cs Cs Ts As Cs Cs Gs Ts
Ts moeTs moeCs moeTs moeCs 63 F03 200 moeGs moeTs moeCs moeCs Cs Cs
As Cs Gs Ts Cs Cs Gs Ts moeCs moeTs moeTs moeCs 64 F04 200 moeTs
moeCs moeAs moeCs Cs As Gs Gs As Cs Gs Gs Cs Gs moeGs moeAs moeCs
moeCs 65 F05 200 moeTs moeAs moeCs moeCs As As Gs Cs As Gs As Cs Gs
Gs moeAs moeGs moeAs moeCs 66 F06 200 moeTs moeCs moeCs moeTs Gs Ts
Cs Ts Ts Ts Gs As Cs Cs moeAs moeCs moeTs moeCs 67 F07 200 moeTs
moeGs moeTs moeCs Ts Ts Ts Gs As Cs Cs As Cs Ts moeCs moeAs moeCs
moeTs 68 F08 200 moeTs moeGs moeAs moeCs Cs As Cs Ts Cs As Cs Ts Gs
As moeCs moeGs moeTs moeGs 69 F09 200 moeTs moeGs moeAs moeCs Gs Ts
Gs Ts Cs Ts Cs As As Gs moeTs moeGs moeAs moeCs 70 F10 200 moeTs
moeCs moeAs moeAs Gs Ts Gs As Cs Ts Ts Ts Gs Cs moeCs moeTs moeTs
moeAs 71 F11 200 moeTs moeGs moeTs moeTs Ts As Ts Gs As Cs Gs Cs Ts
Gs moeGs moeGs moeGs moeTs 72 F12 200 moeTs moeTs moeAs moeTs Gs As
Cs Gs Cs Ts Gs Gs Gs Gs moeTs moeTs moeGs moeGs 73 G01 200 moeTs
moeGs moeAs moeCs Gs Cs Ts Gs Gs Gs Gs Ts Ts Gs moeGs moeAs moeTs
moeCs 74 G02 200 moeTs moeCs moeGs moeTs Cs Ts Ts Cs Cs Gs Gs Ts Gs
Gs moeAs moeGs moeTs moeCs 75 G03 200 moeTs moeGs moeGs moeTs As Gs
As Cs Gs Ts Gs Gs As Cs moeAs moeCs moeTs moeTs 76 G04 200 moeTs
moeTs moeCs moeTs Ts Cs Cs Gs As Cs Cs Gs Ts Gs moeAs moeCs moeAs
moeTs 77 G05 200 moeTs moeGs moeGs moeTs As Gs As Cs Gs Cs Ts Cs Gs
Gs moeGs moeAs moeCs moeGs 78 G06 200 moeTs moeAs moeGs moeAs Cs Gs
Cs Ts Cs Gs Gs Gs As Cs moeGs moeGs moeGs moeTs 79 G07 200 moeTs
moeTs moeTs moeTs As Cs As Gs Ts Gs Gs Gs As As moeCs moeCs moeTs
moeGs 80 G08 200 moeTs moeGs moeGs moeGs As As Cs Cs Ts Gs Ts Ts Cs
Gs moeAs moeCs moeAs moeCs 81 G09 200 moeTs moeCs moeGs moeGs Gs As
Cs Cs As Cs Cs As Cs Ts moeAs moeGs moeGs moeGs 82 G10 200 moeTs
moeAs moeGs moeGs As Cs As As As Cs Gs Gs Ts As moeGs moeGs moeAs
moeGs 83 G11 200 moeTs moeGs moeCs moeTs As Gs As As Gs Gs As Cs Cs
Gs moeAs moeGs moeGs moeTs 84 G12 200 moeTs moeCs moeTs moeGs Ts Cs
As Cs Ts Cs Cs Gs As Cs moeGs moeTs moeGs moeGs
[0212] Reagent File (.tab File)
[0213] Table 5 is a tab for reagents necessary for synthesizing an
oligonucleotides having both 2'-O-(methoxy-ethy) nucleosides and
2'-deoxy nucleosides located therein.
7TABLE 5 Identity of columns: GroupName, Bottle ID, ReagentName,
FlowRate, Concentration. Wherein reagent name is identified using
base identifier, `moe` indicated a 2'-O-(methoxyethy) substituted
nucleoside and `cpg` indicates a control pore glass solid support
medium. The columns wrap around to next line when longer than one
line. SUPPORT BEGIN 0 moeG moeGcpg 100 1 0 moe5meC moe5meCcpg 100 1
0 moeA moeAcpg 100 1 0 moeT moeTcpg 100 1 END DEBLOCK BEGIN 70 TCA
TCA 100 1 END WASH BEGIN 65 ACN ACN 190 1 END OXIDIZERS BEGIN 68
BEAU BEAUCAGE 320 1 END CAPPING BEGIN 66 CAP_B CAP_B 220 1 67 CAP_A
CAP_A 230 1 END DEOXY_THIOATE BEGIN 31,32 Gs deoxyG 270 1 39,40
5meCs 5methyldeoxyC 270 1 37,38 As deoxyA 270 1 29,30 Ts deoxyT 270
1 END MOE-THIOATE BEGIN 15,16 moeGs methoxyethoxyG 240 1 23,24
moe5meCs methoxyethoxyC 240 1 21,22 moeAs methoxyethoxyA 240 1
13,14 moeTs methoxyethoxyT 240 1 END ACTIVATORS BEGIN 5,6,7,8 SET
s-ethyl-tet 280 Activates DEOXY_THIOATE MOE_THIOATE END
Example 4
Oligonucleotide Synthesis-96 Well Plate Format
[0214] oligonucleotides were synthesized via solid phase P(III)
phosphoramidite chemistry using a multi well automated synthesizer
utilizing input files as described in EXAMPLE 3 above. The
oligonucleotides were synthesized by assembling 96 sequences
simultaneously in a standard 96 well format. Phosphodiester
intemucleotide linkages were afforded by oxidation with aqueous
iodine. Phosphorothioate intemucleotide linkages were generated by
sulfurization utilizing 3,H-1,2 benzodithiole-3-one 1,1 dioxide
(Beaucage Reagent) in anhydrous acetonitrile. Standard
base-protected beta-cyanoethyldiisopropy- l phosphoramidites were
purchased from commercial vendors (e.g. PE/ABI, Pharmacia).
Non-standard nucleosides are synthesized as per known literature or
patented methods. They are utilized as base protected
beta-cyanoethyldiisopropyl phosphoramidites.
[0215] Oligonucleotides were cleaved from support and deprotected
with concentrated NH.sub.4OH at elevated temperature (55-60.degree.
C.) for 12-16 hours and the released product then dried in vacuo.
The dried product was then re-suspended in sterile water to afford
a master plate from which all analytical and test plate samples are
then diluted utilizing robotic pipettors.
Example 5
Alternative Oligonucleotide Synthesis
[0216] Unsubstituted and substituted phosphodiester oligo
nucleotides are alternately synthesized on an automated DNA
synthesizer (Applied Biosystems model 380B) using standard
phosphoramidite chemistry with oxidation by iodine.
[0217] Phosphorothioates are synthesized as per the phosphodiester
oligonucleotides except the standard oxidation bottle was replaced
by 0.2 M solution of 3H-1,2-benzodithiole-3-one 1,1-dioxide in
acetonitrile for the stepwise thiation of the phosphite linkages.
The thiation wait step was increased to 68 sec and was followed by
the capping step. After cleavage from the CPG column and deblocking
in concentrated ammonium hydroxide at 55.degree. C. (18 hr), the
oligonucleotides were purified by precipitating twice with 2.5
volumes of ethanol from a 0.5 M NaCl solution.
[0218] Phosphinate oligonucleotides are prepared as described in
U.S. Pat. No. 5,508,270, herein incorporated by reference.
[0219] Alkyl phosphonate oligonucleotides are prepared as described
in U.S. Pat. No. 4,469,863, herein incorporated by reference.
[0220] 3'-Deoxy-3'-methylene phosphonate oligonucleotides are
prepared as described in U.S. Pat. Nos. 5,610,289 or 5,625,050,
herein incorporated by reference.
[0221] Phosphoramidite oligonucleotides are prepared as described
in U.S. Pat. No. 5,256,775 or U.S. Pat. No. 5,366,878, hereby
incorporated by reference.
[0222] Alkylphosphonothioate oligonucleotides are prepared as
described in published PCT applications PCT/US94/00902 and
PCT/US93/06976 (published as WO 94/17093 and WO 94/02499,
respectively).
[0223] 3'-Deoxy-3'-amino phosphoramidate oligonucleotides are
prepared as described in U.S. Pat. No. 5,476,925, herein
incorporated by reference.
[0224] Phosphotriester oligonucleotides are prepared as described
in U.S. Pat. No. 5,023,243, herein incorporated by reference.
[0225] Boranophosphate oligonucleotides are prepared as described
in U.S. Pat. Nos. 5,130,302 and 5,177,198, both herein incorporated
by reference.
[0226] Methylenemethylimino linked oligonucleosides, also
identified as MMI linked oligonucleosides,
methylenedi-methylhydrazo linked oligonucleosides, also identified
as MDH linked oligonucleosides, and methylenecarbonylamino linked
oligonucleosides, also identified as amide-3 linked
oligonucleosides, and methyleneaminocarbonyl linked oligo
nucleosides, also identified as amide-4 linked oligonucleosides, as
well as mixed backbone compounds having, for instance, alternating
MMI and PO or PS linkages are prepared as described in U.S. Pat.
Nos. 5,378,825; 5,386,023; 5,489,677; 5,602,240 and 5,610,289, all
of which are herein incorporated by reference.
[0227] Formacetal and thioformacetal linked oligonucleosides are
prepared as described in U.S. Pat. Nos. 5,264,562 and 5,264,564,
herein incorporated by reference.
[0228] Ethylene oxide linked oligonucleosides are prepared as
described in U.S. Pat. No. 5,223,618, herein incorporated by
reference.
Example 6
PNA Synthesis
[0229] Peptide nucleic acids (PNAS) are prepared in accordance with
any of the various procedures referred to in Peptide Nucleic Acids
(PNA): Synthesis, Properties and Potential Applications, Bioorganic
& Medicinal Chemistry, 1996, 4, 5. They may also be prepared in
accordance with U.S. Pat. Nos. 5,539,082; 5,700,922, and 5,719,262,
herein incorporated by reference.
Example 7
Chimeric Oligonucleotide Synthesis
[0230] Chimeric oligonucleotides, oligonucleosides or mixed
oligonucleotides/oligonucleosides of the invention can be of
several different types. These include a first type wherein the
`gap` segment of linked nucleosides is positioned between 5' and 3'
`wing` segments of linked nucleosides and a second `open end` type
wherein the `gap` segment is located at either the 3' or the 5'
terminus of the oligomeric compound. Oligonucleotides of the first
type are also known in the art as `gapmers` or gapped
oligonucleotides. oligonucleotides of the second type are also
known in the art as `hemimers` or `wingmers.`
[0231] A. [2'-O-Me]-[2'-deoxy]-[2'-O-Me] Chimeric Phosphorothioate
Oligonucleotides
[0232] Chimeric oligonucleotides having 2'-O-alkyl phosphorothioate
and 2'-deoxy phosphorothioate oligonucleotide segments are
synthesized using 2'-deoxy-5'-dimethoxytrityl-3'-O-phosphoramidites
for the DNA portion and
5'-dimethoxytrityl-2'-O-methyl-3'-O-phosphoramidites for 5' and 3'
wings. The standard synthesis cycle is modified by increasing the
wait step after the delivery of tetrazole and base to 600 s
repeated four times for DNA and twice for 2'-O-methyl. The fully
protected oligonucleotide was cleaved from the support and the
phosphate group is deprotected in 3:1 Ammonia/Ethanol at room
temperature over-night then lyophilized to dryness. Treatment in
methanolic ammonia for 24 hrs at room temperature is done to
deprotect all bases and the samples are again lyophilized to
dryness.
[0233] B. [2'-O-(2-Methoxyethyl)]-[2-deoxy]-[2'-O-(Methoxyethyl)]
Chimeric Phosphorothioate Oligonucleotides
[0234] [2'-O-(2-methoxyethyl)]-[2'-deoxy]-[-2'-O-(methoxy-ethyl)]
chimeric phosphorothioate oligonucleotides are prepared as per the
procedure above for the 2'-O-methyl chimeric oligonucleotide, with
the substitution of 2'-O-(methoxyethyl)amidites for the 2-O-methyl
amidites.
[0235] C. [2'-O-(2-Methoxyethyl)Phosphodiester]-[2'-deoxy
Phosphorothioate]-[2'-O-(2-Methoxyethyl)Phosphodiester] Chimeric
Oligonucleotide
[0236] [2'-O-(2-methoxyethyl phosphodiester]-[2'-deoxy
phosphorothioate]-[2'-O-(methoxyethyl)phosphodiester] chimeric
oligonucleotides are prepared as per the above procedure for the
2'-O-methyl chimeric oligonucleotide with the substitution of
2'-O-(methoxyethyl)amidites for the 2'-O-methyl amidites in the
wing portions. Sulfirization utilizing 3,H-1,2 benzodithiole-3-one
1,1 dioxide (Beaucage Reagent) is used to generate the
phosphorothioate inter-nucleotide linkages within the wing portions
of the chimeric structures. Oxidization with iodine is used to
generate the phosphodiester intemucleotide linkages for the center
gap.
[0237] Other chimeric oligonucleotides, chimeric oligonucleosides
and mixed chimeric oligonucleotides/oligonucleosides are
synthesized according to U.S. Pat. No. 5,623,065, herein
incorporated by reference.
Example 8
Output Oligonucleotides from Automated Oligonucleotide
Synthesis
[0238] Using the seq files, the .cmd files and .tab file of Example
3, oligonucleotides were prepared as per the protocol of the 96
well format of Example 4. The oligonucleotides were prepared
utilizing phosphorothioate chemistry to give in one instance a
first library of phosphorothioate oligodeoxynucleotides. The
oligonucleotides were prepared in a second instance as a second
library of hybrid oligonucleotides having phosphorothioate
backbones with a first and third `wing` region of
2'-O-(methoxyethyl)nucleotides on either side of a center gap
region of 2'-deoxy nucleotides. The two libraries contained the
same set of oligonucleotide sequences. Thus the two libraries are
redundant with respect to sequence but are unique with respect to
the combination of sequence and chemistry. Because the sequences of
the second library of compounds is the same as the first (how-ever
the chemistry is different), for brevity sake, the second library
is not shown.
[0239] For illustrative purposes Tables 6-a and 6-b show the
sequences of an intial first library, i.e., a library of
phosphorothioate oligonucleotides targeted to a CD40 tar-get. The
compounds of Table 6-a shows the members of this listed in
compliance with the established rule for listing SEQ ID NO:, i.e.,
in numerical SEQ ID NO: order.
8TABLE 6-a Sequences of Oligonucleotides Targeted to CD40 by SEQ ID
NO.: SEQ NUCLEOBASE SEQUENCE ID NO. CCAGGCGGCAGGACCACT 1
GACCAGGCGGCAGGACCA 2 AGGTGAGACCAGGCGGCA 3 CAGAGGCAGACGAACCAT 4
GCAGAGGCAGACGAACCA 5 GCAAGCAGCCCCAGAGGA 6 GGTCAGCAAGCAGCCCCA 7
GACAGCGGTCAGCAAGCA 8 GATGGACAGCGGTCAGCA 9 TCTGGATGGACAGCGGTC 10
GGTGGTTCTGGATGGACA 11 GTGGGTGGTTCTGGATGG 12 GCAGTGGGTGGTTCTGGA 13
CACAAAGAACAGCACTGA 14 CTGGCACAAAGAACAGCA 15 TCCTGGCTGGCACAAAGA 16
CTGTCCTGGCTGGCACAA 17 CTCACCAGTTTCTGTCCT 18 TCACTCACCAGTTTCTGT 19
GTGCAGTCACTCACCAGT 20 ACTCTGTGCAGTCACTCA 21 CAGTGAACTCTGTGCAGT 22
ATTCCGTTTCAGTGAACT 23 GAAGGCATTCCGTTTCAG 24 TTCACCGCAAGGAAGGCA 25
CTCTGTTCCAGGTGTCTA 26 CTGGTGGCAGTGTGTCTC 27 TGGGGTCGCAGTATTTGT 28
GGTTGGGGTCGCAGTATT 29 CTAGGTTGGGGTCGCAGT 30 GGTGCCCTTCTGCTGGAC 31
CTGAGGTGCCCTTCTGCT 32 GTGTCTGTTTCTGAGGTG 33 TGGTGTCTGTTTCTGAGG 34
ACAGGTGCAGATGGTGTC 35 TTCACAGGTGCAGATGGT 36 GTGCCAGCCTTCTTCACA 37
TACAGTGCCAGCCTTCTT 38 GGACACAGCTCTCACAGG 39 TGCAGGACACAGCTCTCA 40
GAGCGGTGCAGGACACAG 41 AAGCCGGGCGAGCATGAG 42 AATCTGCTTGACCCCAAA 43
GAAACCCCTGTAGCAATC 44 GTATCAGAAACCCCTGTA 45 GCTCGCAGATGGTATCAG 46
GCAGGGCTCGCAGATGGT 47 TGGGCAGGGCTCGCAGAT 48 GACTGGGCAGGGCTCGCA 49
CATTGGAGAAGAAGCCGA 50 GATGACACATTGGAGAAG 51 GCAGATGACACATTGGAG 52
TCGAAAGCAGATGACACA 53 GTCCAAGGGTGACATTTT 54 CACAGCTTGTCCAAGGGT 55
TTGGTCTCACAGCTTGTC 56 CAGGTCTTTGGTCTCACA 57 CTGTTGCACAACCAGGTC 58
GTTTGTGCCTGCCTGTTG 59 GTCTTGTTTGTGCCTGCC 60 CCACAGACAACATCAGTC 61
CTGGGGACCACAGACAAC 62 TCAGCCGATCCTGGGGAC 63 CACCACCAGGGCTCTCAG 64
GGGATCACCACCAGGGCT 65 GAGGATGGCAAACAGGAT 66 ACCAGCACCAAGAGGATG 67
TTTTGATAAAGACCAGCA 68 TATTGGTTGGCTTCTTGG 69 GGGTTCCTGCTTGGGGTG 70
GTCGGGAAAATTGATCTC 71 GATCGTCGGGAAAATTGA 72 GGAGCCAGGAAGATCGTC 73
TGGAGCCAGGAAGATCGT 74 TGGAGCAGCAGTGTTGGA 75 GTAAAGTCTCCTGCACTG 76
TGGCATCCATGTAAAGTC 77 CGGTTGGCATCCATGTAA 78 CTCTTTGCCATCCTCCTG 79
CTGTCTCTCCTGCACTGA 80 GGTGCAGCCTCACTGTCT 81 AACTGCCTGTTTGCCCAC 82
CTTCTGCCTGCACCCCTG 83 ACTGACTGGGCATAGCTC 84
[0240] The sequences shown in Table 6-a above and Table 6-B below
are in a 5' to 3' direction. This is reversed with respect to 3' to
5' direction shown in the seq files of Example 3. For synthesis
purposes, the .seq files are generated reading from 3' to 5'. This
allows for aligning all of the 3' most `A nucleosides together, all
of the 3' most `G` nucleosides together, all of the 3' most `C`
nucleosides together and all of the 3' most `T` nucleosides
together. Thus when the first nucleoside of each particular
oligonucleotide (attached to the solid support) is added to the
wells on the plates, machine movement is reduced since an automatic
pipette can move in a linear manner down one row and up another on
the 96 well plate.
[0241] The location of the well holding each particular
oligonucleotides is indicated by row and column. There are eight
rows designated A to G and twelve columns designated 1 to 12 in a
typical 96 well format plate. Any particular well location is
indicated by its `Well No.` which is indicated by the combination
of the row and the column, e.g. AO8 is the well at row A, column
8.
[0242] In Table 6-b below, the oligonucleotide of Table 6-a are
shown reordered according to the Well No. on their synthesis plate.
The order shown in Table 6-b is the actually order as synthesized
on an automated synthesizer taking advantage of the preferred
placement of the first nucleoside according to the above alignment
criteria.
9TABLE 6-b Sequences of Oligonucleotides Targeted to CD40 Order by
Synthesis Well No. Well No. SEQ ID A01 GACCAGGCGGCAGGACCA 2 A02
AGGTGAGACCAGGCGGCA 3 A03 GCAGAGGCAGACGAACCA 5 A04
GCAAGCAGCCCCAGAGGA 6 A05 GGTCAGCAAGCAGCCCCA 7 A06
GACAGCGGTCAGCAAGCA 8 A07 GATGGACAGCGGTCAGCA 9 A08
GGTGGTTCTGGATGGACA 11 A09 GCAGTGGGTGGTTCTGGA 13 A10
CACAAAGAACAGCACTGA 14 A11 CTGGCACAAAGAACAGCA 15 A12
TCCTGGCTGGCACAAAGA 16 B01 CTGTCCTGGCTGGCACAA 17 B02
ACTCTGTGCAGTCACTCA 21 B03 TTCACCGCAAGGAAGGCA 25 B04
CTCTGTTCCAGGTGTCTA 26 B05 GTGCCAGCCTTCTTCACA 37 B06
TGCAGGACACAGCTCTCA 40 B07 AATCTGCTTGACCCCAAA 43 B08
GTATCAGAAACCCCTGTA 45 B09 GACTGGGCAGGGCTCGCA 49 B10
CATTGGAGAAGAAGCCGA 50 B11 TCGAAAGCAGATGACACA 53 B12
CAGGTCTTTGGTCTCACA 57 C01 TTTTGATAAAGACCAGCA 68 C02
GATCGTCGGGAAAATTGA 72 C03 TGGAGCAGCAGTGTTGGA 75 C04
CGGTTGGCATCCATGTAA 78 C05 CTGTCTCTCCTGCACTGA 80 C06
TCTGGATGGACAGCGGTC 10 C07 CTGGTGGCAGTGTGTCTC 27 C08
GGTGCCCTTCTGCTGGAC 31 C09 ACAGGTGCAGATGGTGTC 35 C10
GAAACCCCTGTAGCAATC 44 C11 TTGGTCTCACAGCTTGTC 56 C12
CTGTTGCACAACCAGGTC 58 D01 GTCTTGTTTGTGCCTGCC 60 D02
CCACAGACAACATCAGTC 61 D03 CTGGGGACCACAGACAAC 62 D04
TCAGCCGATCCTGGGGAC 63 D05 GTCGGGAAAATTGATCTC 71 D06
GGAGCCAGGAAGATCGTC 73 D07 TGGCATCCATGTAAAGTC 77 D08
AACTGCCTGTTTGCCCAC 82 D09 ACTGACTGGGCATAGCTC 84 D10
GTGGGTGGTTCTGGATGG 12 D11 GAAGGCATTCCGTTTCAG 24 D12
GTGTCTGTTTCTGAGGTG 33 E01 TGGTGTCTGTTTCTGAGG 34 E02
GGACACAGCTCTCACAGG 39 E03 GAGCGGTGCAGGACACAG 41 E04
AAGCCGGGCGAGCATGAG 42 E05 GCTCGCAGATGGTATCAG 46 E06
GATGACACATTGGAGAAG 51 E07 GCAGATGACACATTGGAG 52 E08
GTTTGTGCCTGCCTGTTG 59 E09 CACCACCAGGGCTCTCAG 64 E10
ACCAGCACCAAGAGGATG 67 E11 TATTGGTTGGCTTCTTGG 69 E12
GGGTTCCTGCTTGGGGTG 70 F01 GTAAAGTCTCCTGCACTG 76 F02
CTCTTTGCCATCCTCCTG 79 F03 CTTCTGCCTGCACCCCTG 83 F04
CCAGGCGGCAGGACCACT 1 F05 CAGAGGCAGACGAACCAT 4 F06
CTCACCAGTTTCTGTCCT 18 F07 TCACTCACCAGTTTCTGT 19 F08
GTGCAGTCACTCACCAGT 20 F09 CAGTGAACTCTGTGCAGT 22 F10
ATTCCGTTTCAGTGAACT 23 F11 TGGGGTCGCAGTATTTGT 28 F12
GGTTGGGGTCGCAGTATT 29 G01 CTAGGTTGGGGTCGCAGT 30 G02
CTGAGGTGCCCTTCTGCT 32 G03 TTCACAGGTGCAGATGGT 36 G04
TACAGTGCCAGCCTTCTT 38 G05 GCAGGGCTCGCAGATGGT 47 G06
TGGGCAGGGCTCGCAGAT 48 G07 GTCCAAGGGTGACATTTT 54 G08
CACAGCTTGTCCAAGGGT 55 G09 GGGATCACCACCAGGGCT 65 G10
GAGGATGGCAAACAGGAT 66 G11 TGGAGCCAGGAAGATCGT 74 G12
GGTGCAGCCTCACTGTCT 81
Example 9
Oligonucleotide Analysis
[0243] A. Oligonucleotide Analysis-96 Well Plate Format
[0244] The concentration of oligonucleotide in each well was
assessed by dilution of samples and UV absorption spectroscopy. The
full-length integrity of the individual products was evaluated by
capillary electrophoresis (CE) in either the 96 well format
(Beckman MDQ) or, for individually prepared samples, on a
commercial CE apparatus (e.g., Beckman 5000, ABI 270). Base and
backbone composition was confirmed by mass analysis of the
compounds utilizing electrospray-mass spectroscopy. All assay test
plates were diluted from the master plate using single and
multi-channel robotic pipettors.
[0245] B. Alternative Oligonucleotide Analysis
[0246] After cleavage from the controlled pore glass sup-port
(Applied Biosystems) and deblocking in concentrated ammonium
hydroxide at 55.degree. C. for 18 hours, the oligonucleotides or
oligonucleosides are purified by precipitation twice out of 0.5 M
NaCl with 2.5 volumes ethanol. Synthesized oligonucleotides are
analyzed by polyacrylamide gel electrophoresis on denaturing gels.
Oligonucleotide purity is checked by .sup.31P nuclear magnetic
resonance spectroscopy, and/or by HPLC, as described by Chiang et
al., J. Biol. Chem. 1991, 266, 18162.
Example 10
Automated Assay of CD40 Oligonucleotides
[0247] A. Poly(A)+mRNA isolation
[0248] Poly(A)+mRNA was isolated according to Miura et al. (Clin.
Chem., 1996, 42, 1758). Briefly, for cells grown on 96-well plates,
growth medium was removed from the cells and each well was washed
with 200 .mu.l cold PBS. 60 .mu.l lysis buffer (10 mM Tris-HCl, pH
7.6, 1 mM EDTA, 0.5 M NaCl, 0.5% NP-40, 20 mM
vanadyl-ribonucleoside complex) was added to each well, the plate
was gently agitated and then incubated at room temperature for five
minutes. 55 ul of lysate was transferred to Oligo d(T) coated 96
well plates (AGCT Inc., Irvine, Calif.). Plates were incubated for
60 minutes at room temperature, washed 3 times with 200 ul of wash
buffer (10 mM Tris-HCl pH 7.6, 1 mM EDTA, 0.3 M NaCl). After the
final wash, the plate was blotted on paper towels to remove excess
wash buffer and then air-dried for 5 minutes. 60 ul of elution
buffer (5 mM Tris-HCl pH 7.6), preheated to 70.degree. C. was added
to each well, the plate was incubated on a 90.degree. C. plate for
5 minutes, and the eluate then transferred to a fresh 96-well
plate. Cells grown on 100 mm or other standard plates may be
treated similarly, using appropriate volumes of all solutions.
[0249] B. RT-PCR Analysis of CD40 mRNA Levels
[0250] Quantitation of CD40 mRNA levels was deter-mined by reverse
transcriptase polymerase chain reaction (RT-PCR) using the ABI
PRISM.TM. 7700 Sequence Detection System (PE-Applied Biosystems,
Foster City, Calif.) according to manufacturer's instructions. This
is a closed-tube, non-gel-based, fluorescence detection system
which allows high-throughput quantitation of polymerase chain
reaction (PCR) products in real-time.
[0251] As opposed to standard PCR, in which amplification products
are quantitated after the PCR is completed, products in RT-PCR are
quantitated as they accumulate. This is accomplished by including
in the PCR reaction an oligonucleotide probe that anneals
specifically between the for-ward and reverse PCR primers, and
contains two fluorescent dyes. A reporter dye (e.g., JOE or FAM,
PE-Applied Biosystems, Foster City, Calif.) is attached to the 5'
end of the probe and a quencher dye (e.g., TAMRA, PE-Applied
Biosystems, Foster City, Calif.) is attached to the 3' end of the
probe. When the probe and dyes are intact, reporter dye emission is
quenched by the proximity of the 3' quencher dye. During
amplification, annealing of the probe to the target sequence
creates a substrate that can be cleaved by the 5'-exonuclease
activity of Taq polymerase. During the extension phase of the PCR
amplification cycle, cleavage of the probe by Taq polymerase
releases the reporter dye from the remainder of the probe (and
hence from the quencher moiety) and a sequence-specific fluorescent
signal is generated.
[0252] With each cycle, additional reporter dye molecules are
cleaved from their respective probes, and the fluorescence
intensity is monitored at regular (six-second) intervals by laser
optics built into the ABI PRISM.TM. 7700 Sequence Detection System.
In each assay, a series of parallel reactions containing serial
dilutions of mRNA from untreated control samples generates a
standard curve that is used to quantitate the percent inhibition
after antisense oligonucleotide treatment of test samples.
[0253] RT-PCR reagents were obtained from PE-Applied Biosystems,
Foster City, Calif. RT-PCR reactions were carried out by adding 25
ul PCR cocktail 1.times.Tagman.TM. buffer A, 5.5 mM MgCl.sub.2, 300
uM each of DATP, dCTP and dGTP, 600 uM of dUTP, 100 nM each of
forward primer, reverse primer, and probe, 20 U RNAse inhibitor,
1.25 units AmpliTaq Gold.TM., and 12.5 U MuLV reverse
transcriptase) to 96 well plates containing 25 ul poly(A) mRNA
solution. The RT reaction was carried out by incubation for 30
minutes at 48.degree. C. following a 10 minute incubation at
95.degree. C. to activate the AmpliTaq Gold.TM., 40 cycles of a
two-step PCR protocol were carried out: 95.degree. C. for 15
seconds (denaturation) followed by 60.degree. C. for 1.5 minutes
(annealing/extension).
[0254] For CD40, the PCR primers were: forward primer:
[0255] (SEQ ID NO:86) reverse primier:
[0256] (SEQ ID NO:87), and the PCR probe was:
FAM-TTCCTTGCGGTGAAAGCGAATTCC- TTAMRA
[0257] (SEQ ID NO:88) where FAM (PE-Applied Biosystems, Foster
City, Calif.) is the fluorescent reporter dye and TAMRA (PE-Applied
Biosystems, Foster City, Calif.) is the quencher dye.
[0258] For GAPDH the PCR primers were:
[0259] forward primer: GAAGGTGAAGGTCGGAGTC (SEQ ID NO:89)
[0260] reverse primer: GAAGATGGTGATGGGATTTC (SEQ ID NO:90), and the
was: 5' JOECAAGCTTCCCGTTCTCAGCC-TAMRA 3' (SEQ ID No. 91) where
plied Biosystems, Foster City, Calif.) is the fluorescent reporter
dye and TAMRA d Biosystems, Foster City, Calif.) is the quencher
dye.
Example 11
Inhibition of CD40 Expression by Phosphorothioate
Oligodeoxynucleotides
[0261] In accordance with the present invention, a series of
oligonucleotides complementary to mRNA were designed to target
different regions of the human CD40 mRNA, using published sequences
(GenBank accession number X60592, incorporated herein as SEQ ID
NO:85). The oligonucleotides are shown in Table 7. Target sites are
indicated by the beginning nucleotide numbers, as given in the
sequence source reference (X60592), to which the oligonucleotide
binds. All compounds in Table 7 are oligodeoxynucleotides with
phosphorothioate backbones (intemucleoside linkages) throughout.
Data are averages from three experiments.
10TABLE 7 Inhibition of CD40 mRNA Levels by Phosphorothioate
Oligodeoxynucleotides TARGET % SEQ ISIS# SITE SEQUENCE INHIB. ID
NO. 18623 18 CCAGGCGGCAGGACCACT 30.71 1 18624 20 GACCAGGCGGCAGGACCA
28.09 2 18625 26 AGGTGAGACCAGGCGGCA 21.89 3 18626 48
CAGAGGCAGACGAACCAT 0.00 4 18627 49 GCAGAGGCAGACGAACCA 0.00 5 18628
73 GCAAGCAGCCCCAGAGGA 0.00 6 18629 78 GGTCAGCAAGCAGCCCCA 29.96 7
18630 84 GACAGCGGTCAGCAAGCA 0.00 8 18631 88 GATGGACAGCGGTCAGCA 0.00
9 18632 92 TCTGGATGGACAGCGGTC 0.00 10 18633 98 GGTGGTTCTGGATGGACA
0.00 11 18634 101 GTGGGTGGTTCTGGATGG 0.00 12 18635 104
GCAGTGGGTGGTTCTGGA 0.00 13 18636 152 CACAAAGAACAGCACTGA 0.00 14
18637 156 CTGGCACAAAGAACAGCA 0.00 15 18638 162 TCCTGGCTGGCACAAAGA
0.00 16 18639 165 CTGTCCTGGCTGGCACAA 4.99 17 18640 176
CTCACCAGTTTCTGTCCT 0.00 18 18641 179 TCACTCACCAGTTTCTGT 0.00 19
18642 185 GTGCAGTCACTCACCAGT 0.00 20 18643 190 ACTCTGTGCAGTCACTCA
0.00 21 18644 196 CAGTGAACTCTGTGCAGT 5.30 22 18645 205
ATTCCGTTTCAGTGAACT 0.00 23 18646 211 GAAGGCATTCCGTTTCAG 9.00 24
18647 222 TTCACCGCAAGGAAGGCA 0.00 25 18648 250 CTCTGTTCCAGGTGTCTA
0.00 26 18649 267 CTGGTGGCAGTGTGTCTC 0.00 27 18650 286
TGGGGTCGCAGTATTTGT 0.00 28 18651 289 GGTTGGGGTCGCAGTATT 0.00 29
18652 292 CTAGGTTGGGGTCGCAGT 0.00 30 18653 318 GGTGCCCTTCTGCTGGAC
19.67 31 18654 322 CTGAGGTGCCCTTCTGCT 15.63 32 18655 332
GTGTCTGTTTCTGAGGTG 0.00 33 18656 334 TGGTGTCTGTTTCTGAGG 0.00 34
18657 345 ACAGGTGCAGATGGTGTC 0.00 35 18658 348 TTCACAGGTGCAGATGGT
0.00 36 18659 360 GTGCCAGCCTTCTTCACA 5.67 37 18660 364
TACAGTGCCAGCCTTCTT 7.80 38 18661 391 GGACACAGCTCTCACAGG 0.00 39
18662 395 TGCAGGACACAGCTCTCA 0.00 40 18663 401 GAGCGGTGCAGGACACAG
0.00 41 18664 416 AAGCCGGGCGAGCATGAG 0.00 42 18665 432
AATCTGCTTGACCCCAAA 5.59 43 18666 446 GAAACCCCTGTAGCAATC 0.10 44
18667 452 GTATCAGAAACCCCTGTA 0.00 45 18668 463 GCTCGCAGATGGTATCAG
0.00 46 18669 468 GCAGGGCTCGCAGATGGT 34.05 47 18670 471
TGGGCAGGGCTCGCAGAT 0.00 48 18671 474 GACTGGGCAGGGCTCGCA 2.71 49
18672 490 CATTGGAGAAGAAGCCGA 0.00 50 18673 497 GATGACACATTGGAGAAG
0.00 51 18674 500 GCAGATGACACATTGGAG 0.00 52 18675 506
TCGAAAGCAGATGACACA 0.00 53 18676 524 GTCCAAGGGTGACATTTT 8.01 54
18677 532 CACAGCTTGTCCAAGGGT 0.00 55 18678 539 TTGGTCTCACAGCTTGTC
0.00 56 18679 546 CAGGTCTTTGGTCTCACA 6.98 57 18680 558
CTGTTGCACAACCAGGTC 18.76 58 18681 570 GTTTGTGCCTGCCTGTTG 2.43 59
18682 575 GTCTTGTTTGTGCCTGCC 0.00 60 18683 590 CCACAGACAACATCAGTC
0.00 61 18684 597 CTGGGGACCACAGACAAC 0.00 62 18685 607
TCAGCCGATCCTGGGGAC 0.00 63 18686 621 CACCACCAGGGCTCTCAG 23.31 64
18687 626 GGGATCACCACCAGGGCT 0.00 65 18688 657 GAGGATGGCAAACAGGAT
0.00 66 18689 668 ACCAGCACCAAGAGGATG 0.00 67 18690 679
TTTTGATAAAGACCAGCA 0.00 68 18691 703 TATTGGTTGGCTTCTTGG 0.00 69
18692 729 GGGTTCCTGCTTGGGGTG 0.00 70 18693 750 GTCGGGAAAATTGATCTC
0.00 71 18694 754 GATCGTCGGGAAAATTGA 0.00 72 18695 765
GGAGCCAGGAAGATCGTC 0.00 73 18696 766 TGGAGCCAGGAAGATCGT 0.00 74
18697 780 TGGAGCAGCAGTGTTGGA 0.00 75 18698 796 GTAAAGTCTCCTGCACTG
0.00 76 18699 806 TGGCATCCATGTAAAGTC 0.00 77 18700 810
CGGTTGGCATCCATGTAA 0.00 78 18701 834 CTCTTTGCCATCCTCCTG 4.38 79
18702 861 CTGTCTCTCCTGCACTGA 0.00 80 18703 873 GGTGCAGCCTCACTGTCT
0.00 81 18704 910 AACTGCCTGTTTGCCCAC 33.89 82 18705 954
CTTCTGCCTGCACCCCTG 0.00 83 18706 976 ACTGACTGGGCATAGCTC 0.00 84
[0262] As shown in Table 7, SEQ ID NOS:1, 2, 7, 47 and 82
demonstrated at least 25% CD40 expression and are therefore
preferred compounds of the invention.
Example 12
Inhibition of CD40 Expression by Phosphorothioate 2'-MOE Gapmer
Oligonucleotides
[0263] In accordance with the present invention, a second series of
oligonucleotides complementary to mRNA were designed to target
different regions of the human CD40 mRNA, using published sequence
X60592. The oligonucleotides are shown in Table 8. Target sites are
indicated by the beginning or initial nucleotide numbers, as given
in the sequence source reference (X60592), to which the
oligonucleotide binds.
[0264] All compounds in Table 8 are chimeric oligonucleotides
(gapmers') 18 nucleotides in length, composed of a central `gap`
region consisting of ten 2'-deoxynucleotides, which is flanked on
both sides (5' and 3' directions) by four-nucleotide `wings.` The
wings are composed of 2'-methoxyethyl (2'-MOE) nucleotides. The
intersugar (backbone) linkages are phosphorothioate (P.dbd.S)
through-out the oligonucleotide. Cytidine residues in the 2'-MOE
wings are 5-methylcytidines. Data are averaged from three
experiments.
11TABLE 8 Inhibition of CD40 mRNA Levels by Chimeric
Phosphorothioate Oligonucleotides TARGET % SEQ ISIS# SITE SEQUENCE
Inhibition ID NO. 19211 18 CCAGGCGGCAGGACCA 75.71 1 19212 20
GACCAGGCGGCAGGAC 77.23 2 19213 26 AGGTGAGACCAGGCGG 80.82 3 19214 48
CAGAGGCAGACGAACC 23.68 4 19215 49 GCAGAGGCAGACGAAC 45.97 5 19216 73
GCAAGCAGCCCCAGAG 65.80 6 19217 78 GGTCAGCAAGCAGCCC 74.73 7 19218 84
GACAGCGGTCAGCAAG 67.21 8 19219 88 GATGGACAGCGGTCAG 65.14 9 19220 92
TCTGGATGGACAGCGG 78.71 10 19221 98 GGTGGTTCTGGATGGA 81.33 11 19222
101 GTGGGTGGTTCTGGAT 57.79 12 19223 104 GCAGTGGGTGGTTCTG 73.70 13
19224 152 CACAAAGAACAGCACT 40.25 14 19225 156 CTGGCACAAAGAACAG
60.11 15 19226 162 TCCTGGCTGGCACAAA 10.18 16 19227 165
CTGTCCTGGCTGGCAC 24.37 17 19228 176 CTCACCAGTTTCTGTCC 22.30 18
19229 179 TCACTCACCAGTTTCTG 40.64 19 19230 185 GTGCAGTCACTCACCA
82.04 20 19231 190 ACTCTGTGCAGTCACTC 37.59 21 19232 196
CAGTGAACTCTGTGCA 40.26 22 19233 205 ATTCCGTTTCAGTGAAC 56.03 23
19234 211 GAAGGCATTCCGTTTC 32.21 24 19235 222 TTCACCGCAAGGAAGG
61.03 25 19236 250 CTCTGTTCCAGGTGTCT 62.19 26 19237 267
CTGGTGGCAGTGTGTC 70.32 27 19238 286 TGGGGTCGCAGTATTT 0.00 28 19239
289 GGTTGGGGTCGCAGTA 19.40 29 19240 292 CTAGGTTGGGGTCGCA 36.32 30
19241 318 GGTGCCCTTCTGCTGG 78.91 31 19242 322 CTGAGGTGCCCTTCTGC
69.84 32 19243 332 GTGTCTGTTTCTGAGGT 63.32 33 19244 334
TGGTGTCTGTTTCTGAG 42.83 34 19245 345 ACAGGTGCAGATGGTG 73.31 35
19246 348 TTCACAGGTGCAGATG 47.72 36 19247 360 GTGCCAGCCTTCTTCAC
61.32 37 19248 364 TACAGTGCCAGCCTTCT 46.82 38 19249 391
GGACACAGCTCTCACA 0.00 39 19250 395 TGCAGGACACAGCTCT 52.05 40 19251
401 GAGCGGTGCAGGACAC 50.15 41 19252 416 AAGCCGGGCGAGCATG 32.36 42
19253 432 AATCTGCTTGACCCCA 0.00 43 19254 446 GAAACCCCTGTAGCAA 0.00
44 19255 452 GTATCAGAAACCCCTG 36.13 45 19256 463 GCTCGCAGATGGTATC
64.65 46 19257 468 GCAGGGCTCGCAGATG 74.95 47 19258 471
TGGGCAGGGCTCGCAG 0.00 48 19259 474 GACTGGGCAGGGCTCG 82.00 49 19260
490 CATTGGAGAAGAAGCC 41.31 50 19261 497 GATGACACATTGGAGA 13.81 51
19262 500 GCAGATGACACATTGG 78.48 52 19263 506 TCGAAAGCAGATGACA
59.28 53 19264 524 GTCCAAGGGTGACATT 70.99 54 19265 532
CACAGCTTGTCCAAGG 0.00 55 19266 539 TTGGTCTCACAGCTTGT 45.92 56 19267
546 CAGGTCTTTGGTCTCAC 63.95 57 19268 558 CTGTTGCACAACCAGG 82.32 58
19269 570 GTTTGTGCCTGCCTGTT 70.10 59 19270 575 GTCTTGTTTGTGCCTGC
68.95 60 19271 590 CCACAGACAACATCAG 11.22 61 19272 597
CTGGGGACCACAGACA 9.04 62 19273 607 TCAGCCGATCCTGGGG 0.00 63 19274
621 CACCACCAGGGCTCTC 23.08 64 19275 626 GGGATCACCACCAGGG 57.94 65
19276 657 GAGGATGGCAAACAGG 49.14 66 19277 668 ACCAGCACCAAGAGGA 3.48
67 19278 679 TTTTGATAAAGACCAG 30.58 68 19279 703 TATTGGTTGGCTTCTTG
49.26 69 19280 729 GGGTTCCTGCTTGGGG 13.95 70 19281 750
GTCGGGAAAATTGATC 54.78 71 19282 754 GATCGTCGGGAAAATT 0.00 72 19283
765 GGAGCCAGGAAGATCG 69.47 73 19284 766 TGGAGCCAGGAAGATC 54.48 74
19285 780 TGGAGCAGCAGTGTTG 15.17 75 19286 796 GTAAAGTCTCCTGCAC
30.62 76 19287 806 TGGCATCCATGTAAAG 65.03 77 19288 810
CGGTTGGCATCCATGT 34.49 78 19289 834 CTCTTTGCCATCCTCCT 41.84 79
19290 861 CTGTCTCTCCTGCACTG 25.68 80 19291 873 GGTGCAGCCTCACTGT
76.27 81 19292 910 AACTGCCTGTTTGCCCA 63.34 82 19293 954
CTTCTGCCTGCACCCCT 0.00 83 19294 976 ACTGACTGGGCATAGC 11.55 84
[0265] As shown in Table 8, SEQ ID NOS:1, 2, 3, 6, 7, 8, 9, 10, 11,
12, 13, 15, 20, 23, 25, 26, 27, 31, 32, 33, 35, 37, 40, 41, 46, 47,
49, 52, 53, 54, 57, 58, 59, 60, 65, 71, 73, 74, 77, 81 and 82
demonstrated at least 50% inhibition of CD40 expression and are
therefore preferred compounds of the invention.
Example 13
Oligonucleotide-Sensitive Sites of the CD40 Target Nucleic Acid
[0266] As the data presented in the preceding two Examples shows,
several sequences were present in preferred compounds of two
distinct oligonucleotide chemistries. Specifically, compounds
having SEQ ID NOS:1, 2, 7, 47 and 82 are preferred in both
instances. These compounds map to different regions of the CD40
transcript but nevertheless define accessible sites of the target
nucleic acid.
[0267] For example, SEQ ID NOS:1 and 2 overlap each other and both
map to the 5-untranslated region (5'-UTR) of CD40. Accordingly,
this region of CD40 is particularly preferred for modulation via
sequence-based technologies. Similarly, SEQ ID NOS:7 and 47 map to
the open reading frame of CD40, whereas SEQ ID NO:82 maps to the
3'-untranslated region (3'-UTR). Thus, the ORF and 3'-UTR of CD40
may be targeted by sequence-based technologies as well.
[0268] The reverse complements of the active CD40 compounds are
easily determined by those skilled in the art and may be assembled
to yield nucleotide sequences corresponding to accessible sites on
the target nucleic acid. For example, the assembled reverse
complement of SEQ ID NOS:1 and 2 is represented below as SEQ ID
NO:92:
12 5'-AGTGGTCCTGCCGCCTGGTC-3' SEQ ID NO: 92
.vertline..vertline..vertline..vertline..vertline..vertline..vertline..ve-
rtline..vertline..vertline..vertline..vertline..vertline..vertline..vertli-
ne..vertline..vertline..vertline..vertline..vertline..vertline.
.vertline..vertline..vertline..vertline..vertline..vertline..vertline..ve-
rtline..vertline..vertline..vertline..vertline..vertline..vertline..vertli-
ne..vertline..vertline..vertline..vertline..vertline..vertline.
TCACCAGGACGGCGGACC -5' SEQ ID NO: 1 ACCAGGACGGCGGACCAG-5' SEQ ID
NO: 2
[0269] Through multiple iterations of the process of the invention,
more extensive `footprints` are generated. A library of this
information is compiled and may be used by those skilled in the art
in a variety of sequence-based technologies to study the molecular
and biological functions of CD40 and to investigate or confirm its
role in various diseases and disorders.
Example 14
Site Selection Program
[0270] In a preferred embodiment of the invention, illustrated in
FIG. 20, an application is deployed which facilitates the selection
process for determining the target positions of the oligos to be
synthesized, or `sites.` This program is written using a
three-tiered object-oriented approach. All aspects of the software
described, therefore, are tightly integrated with the relational
database. For this reason, explicit database read and write steps
are not shown. It should be assumed that each step described
includes data-base access. The description below illustrates one
way the program can be used. The actual interface allows users to
skip from process to process at will, in any order.
[0271] Before running the site picking program, the target must
have all relevant properties computed as described previously and
indicated in process step 2204. When the site picking program is
launched at process step 2206 the user is presented with a panel
showing targets which have previously been selected and had their
properties calculated. The user selects one target to work with at
process step 2208 and proceeds to decide if any derived properties
will be needed at process step 2210. Derived properties are
calculated by performing mathematical operations on combinations of
pre-calculated properties as defined by the user at process step
2212.
[0272] The derived properties are made available as peers with all
the pre-calculated properties. The user selects one of the
properties to view plotted versus target position at process step
2214. This graph is shown above a linear representation of the
target. The horizontal or position axis of both the graph and
target are linked and scalable by the user. The zoom range goes
from showing the full target length to showing individual target
bases as letters and individual property points. The user next
selects a threshold value below or above which all sites will be
eliminated from future consideration at process step 2216. The user
decides whether to eliminate more sites based on any other
proper-ties at process step 2218. If they choose to eliminate more,
they return to pick another property to display at process step
2214 and threshold at process step 2216.
[0273] After eliminating sites, the user selects from the remaining
list by choosing any property at process step 2220 and then
choosing a manual or automatic selection technique at process step
2222. In the automatic technique, the user decides whether they
want to pick from maxima or minima and the number of maxima or
minima to be selected as sites at process step 2224. The software
automatically finds and picks the points. When picking manually the
user must decide if they wish to use automatic peak finding at
process step 2226. If the user selects automatic peak finding, then
user must click on the graphed property with the mouse at process
step 2236. The nearest maxima or minima, depending on the modifier
key held down, to the selected point will be picked as the site.
Without the peak finding option, the user must pick a site at
process step 2238 by clicking on its position on the linear
representation of target.
[0274] Each time a site, or group of sites, is picked, a dynamic
property is calculated for all possible sites (not yet eliminated)
at process step 2230. This property indicates the nearness of the
site two a picked site allowing the user to pick sites in
subsequent iterations based on target coverage. After new sites are
picked, the user determines if the desired number of sites has been
picked. If too few sites have been picked the user returns to pick
more 2220. If too many sites have been picked, the user may
eliminate them by selecting and deleting them on the target display
at process step 2234. If the correct number of sites is picked, and
the user is satisfied with the set of picked sites, the user
registers these sites to the database along with their name,
notebook number, and page number at process step 2238. The database
time stamps this registration event.
Example 15
Site Selection Program
[0275] In a preferred embodiment of the invention, illustrated in
FIG. 21, an application is deployed which facilitates the
assignment of specific chemical structure to the complement of the
sequence of the sites previously picked and facilitates the
registration and ordering of these now fully defined antisense
compounds. This program is written using a three-tiered
object-oriented approach. All aspects of the software described,
therefore, are tightly integrated with the relational database. For
this reason, explicit database read and write steps are not shown,
it being understood that each step described also includes
appropriate database read/write access.
[0276] To begin using the oligonucleotide chemistry assignment
program, the user launches it at process step 2302. The user then
selects from the previously selected sets of oligonucleotides at
process step 2304, registered to the database in site picker's
process step 2238. Next, the user must decide whether to manually
assign the chemistry a base at a time, or run the sites through a
template at process step 2306. If the user chooses to use a
template, they must determine if a desired template is available at
process step 2308. If a template is not available with the desired
chemistry modifications and the correct length, the user can define
one at process step 2314.
[0277] To define a template, the user must select the length of the
oligonucleotide the template is to define. This oligonucleotide is
then represented as a bar with selectable regions. The user sets
the number of regions on the oligonucleotide, and the positions and
lengths of these regions by dragging them back and forth on the
bar. Each region is represented by a different color.
[0278] For each region, the user defines the chemistry
modifications for the sugars, the linkers, and the heterocycles at
each base position in the region. At least four heterocycle
chemistries must be given, one for each of the four possible base
types (A, G, C or T or U) in the site sequence the template will be
applied to. A user interface is provided to select these
chemistries which show the molecular structure of each component
selected and its modification name. By pushing on a pop-up list
next to each of the pictures, the user may choose from a list of
structures and names, those possible to put in this place. For
example, the heterocycle that represents the base type G is shown
as a two dimensional structure diagram. If the user clicks on the
pop-up list, a row of other possible structures and names is shown.
The user drags the mouse to the desired chemistry and releases the
mouse. Now the newly selected molecule is displayed as the choice
for G type heterocycle modifications.
[0279] Once the user has created a template, or selected an
existing one, the software applies the template at process step
2312 to each of the complements of the sites in the list. When the
templates are applied, it is possible that chemistries will be
defined which are impossible to make with the chemical precursors
presently used on the automatic synthesizer. To check this, a
database is maintained of all precursors previously designed, and
their availability for automated synthesis. When the templates are
applied, the resulting molecules are tested at process step 2316
against this database to see if they are readily synthesized.
[0280] If a molecule is not readily synthesized, it is added to a
list that the user inspects. At process step 2318, the user decides
whether to modify the chemistry to make it compatible with the
currently recognized list of available chemistries or to ignore it.
To modify a chemistry, the user must use the base at a time
interface at process step 2322. The user can also choose to go
directly to this step, bypassing templates all together at process
step 2306.
[0281] The base at a time interface at process step 2322 is very
similar to the template editor at process step 2314 except that
instead of specifying chemistries for regions, they are defined one
base at a time. This interface also differs in that it dynamically
checks to see if the design is readily synthesized as the user
makes selections. In other words, each choice made limits the
choices the software makes available on the pop-up selection lists.
To accommodate this function, an additional choice is made
available on each pop-up of `not defined.` For example, this allows
the user to inhibit linker choice from restricting the sugar
choices by first setting the linker to `not defined.` The user
would then pick the sugar, and then pick from the remaining linker
choices available.
[0282] Once all of the sites on the list are assigned chemistries
or dropped, they are registered at process step 2324 to the
commercial chemical structure database. Registering to this
database makes sure the structure is unique, assigns it a new
identifier if it is unique, and allows future structure and
substructure searching by creating various hash-tables. The
compound definition is also stored at process step 2326 to various
hash tables referred to as chemistry/position tables. These allow
antisense compound searching and categorization based on
oligonucleotide chemistry modification sequences and equivalent
base sequences.
[0283] The results of the registration are displayed at process
step 2328 with the new IDs if they are new compounds and with the
old IDs if they have been previously registered. The user next
selects which of the compounds processed they wish to order for
synthesis at process step 2330 and registers an order list at
process step 2332 by including scientist name, notebook number and
page number. The database time-stamps this entry. The user may than
choose at process step 2334 to quit the program at process step
2338, go back to the beginning and choose a new site list to work
with process step 2304, or start the oligonucleotide ordering
interface at process step 2336.
Example 16
Gene Walk to Optimize Oligonucleotide Sequence
[0284] A gene walk is executed using a CD40 antisense
oligonucleotide having SEQ ID NO:15 (5'-CTGGCACAAAGAACAGCA. In
effecting this gene walk, the following parameters are used:
13 Gene Walk Parameter Entered value Oligonucleotide Sequence ID:
15 Name of Gene Target: CD40 Scope of Gene Walk: 20 Sequence Shift
Increment: 1
[0285] Entering these values and effecting the gene walk centered
on SEQ ID NO:15 automatically generates the following new
oligonucleotides:
14TABLE 8 Oligonucleotide Generated By Gene Walk SEQ ID Sequence 93
GAACAGCACTGACTGTTT 94 AGAACAGCACTGACTGTT 95 AAGAACAGCACTGACTGT 96
AAAGAACAGCACTGACTG 97 CAAAGAACAGCACTGACT 98 ACAAAGAACAGCACTGAC 99
CACAAAGAACAGCACTGA 100 GCACAAAGAACAGCACTG 101 GGCACAAAGAACAGCACT
102 TGGCACAAAGAACAGCAC 15 CTGGCACAAAGAACAGCA 103 GCTGGCACAAAGAACAGC
104 GGCTGGCACAAAGAACAG 105 TGGCTGGCACAAAGAACA 106
CTGGCTGGCACAAAGAAC 107 CCTGGCTGGCACAAAGAA 108 TCCTGGCTGGCACAAAGA
109 GTCCTGGCTGGCACAAAG 110 TGTCCTGGCTGGCACAAA 111
CTGTCCTGGCTGGCACAA 112 TCTGTCCTGGCTGGCACA
[0286] The list shown above contains 20 oligonucleotide sequences
directed against the CD40 nucleic acid sequence. They are ordered
by the position along the CD40 sequence at which the 5' terminus of
each oligonucleotide hybridizes. Thus, the first ten
oligonucleotides are single-base frame shift sequences directed
against the CD40 sequence upstream of compound SEQ ID NO: 15 and
the latter ten are single-base frame shift sequences directed
against the CD40 sequence downstream of compound SEQ ID NO:15.
Sequence CWU 1
1
* * * * *
References