Methods Of Using Hcn Genes To Treat Cardiac Arrhythmias

Abstract

The subject invention is directed to methods of treating cardiac pacing dysfunction by administering HCN genes, alone or in combination with other genes.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] The present application is a continuation application of U.S. application Ser. No. 11/022,172 filed Dec. 22, 2004 which claims priority under Title 35, United States Code, .sctn.119 to provisional application U.S. Patent application Ser. No. 60/532,764 filed Dec. 24, 2003.

FIELD OF INVENTION

[0002] The present invention relates to compositions and methods for treating cardiac (brady-) arrhythmias, and more particularly to systems and methods involving the application of gene and cell therapy to treat cardiac pacing dysfunction.

BACKGROUND OF THE INVENTION

[0003] In a normal human heart, cardiac contraction is initiated by the spontaneous excitation of the sinoatrial ("SA") node that is located in the right atrium. The electrical current generated by the SA node travels to the atrioventricular ("AV") node where it is then transmitted to the bundle of His and Purkinje network, which branches in many directions to facilitate coordinated contraction of the left and right ventricles.

[0004] The cellular basis for the aforementioned electrical impulse is the action potential (AP). The AP is conventionally divided into five phases (phases 0-4) in which each phase is defined by the cellular membrane potential and the activity of potassium, sodium, chloride, and calcium ion channel proteins that affect that potential. These channels, embedded in cell membranes, allow for electrical impulses to occur as they permit charged ions to rush through them. Propagation of electrical activity from an individual cardiac cell to surrounding cardiac tissue takes place through gap junctions, small pore-like structures that connect cardiac muscle cells to each other. The role of ion channels in cardiac electrical conduction is analogous to electrical conduction in other tissues such as skeletal muscle.

[0005] Some channels or gates have their own "non-provoked" rhythmic excitation also known as automaticity. The generation of cardiac automaticity is based on a complex interplay between at least four different channels of cationic (positive ion) nature: T- and L-type calcium channels, a cation channel named I.sub.f, and potassium channels. The I.sub.f channel has been termed the pacemaker channel. I.sub.f channels have unique properties such as: 1) I.sub.f channels open upon membrane hyperpolarization; 2) I.sub.f channels allow for mixed cation current (Na+ and K+); 3) cyclic AMP (cAMP-cyclic adenosine monophosphate which serves as an intracellular messenger molecule) binds to the cytoplasmic site of the channel thereby accelerating its activation kinetics and shifting the voltage dependence of the cell to more positive voltages; and lastly 4) I.sub.f channels are susceptible to blockade by extracellular Cs.sup.+ (cesium ion). The genes responsible for the I.sub.f channel currents have recently been identified and belong to the HCN (hyperpolarization-activated cyclic nucleotide-gated) family. Four different isoforms have been identified in vertebrates (HCN1, HCN2, HCN3 and HCN4) and all except HCN3 have been found in the heart. HCN3 is specifically expressed in neurons.

[0006] HCN channels directly interact with intracellular cAMP so that an increase in cAMP levels results in increased If and more positive activation potentials. This increase thereby accelerates the heart rate (HR) in response to sympathetic stimulation. In contrast, muscarinic stimulation slows the heart rate in part due to a decrease in cAMP levels and a resulting reduction of I.sub.f and more negative activation potentials. Ludwig, A. et al.; "Two pacemaker channels from human heart with profoundly different activation kinetics." EMBO J. (1999) 18 (9):2323-2329. The importance of the HCN genes in regulating heart rate has recently been shown in a patient who suffered from mutation in his HCN4 gene. This mutation consisted of a complete deletion of the C-terminus of the gene which included the cAMP binding domain. This patient suffered from symptomatic bradycardia and an electronic pacemaker needed to implanted. These mutations were recreated in vitro experiments, and the mutated channel was expressed in a cell line. The mutated HCN4 channel was completely inresponsive to cAMP. See, J Clin Invest. 2003 May: 111(10):1537-45.

[0007] HCN1 is primarily expressed in the brain and shows little dependence on cAMP. HCN1 is also expressed in the rabbit SA node and displays properties of brain h-channels in that it has a short AP. HCN2 and HCN4 are predominantly expressed in the heart, as well as in the brain, and produce currents similar to I.sub.f. HCN1 is the fastest activating channel (25-300 ms), followed by HCN2 and HCN3 (180-500 ms), and lastly HCN4 (a few hundred ms to seconds). All four subunits induce pacemaker current similar to I.sub.f if the units are expressed in heterologous expression systems. In addition, the four isoforms can interact with one another to form tetramers (couplings whereby the two isomers join to create a functionally different structure). The heteromerization of the isoforms changes pacemaker electrophysiology via altered activation kinetics (e.g., allows for modulation (increase or decrease) of heart rate). (Much B et al. J of Biol Chem; 44 (31): 43781-43786). While the exact stoichiometry of the heteromerized HCN channels has not been described yet, it is considered that these channels may form heteromers with a 3:1 ratio, but ratios of 1:1 or 1:3 are also possible as the HCN channels are known to form tetramers. In related rod photoreceptor cyclic nucleotide-gated channels, an asymmetrical stoichiometry of the two subunits present in the tetramers of 3:1 was determined. Zhong H et al. Nature 2002; 420: 193-196. Weitz D et al. Neuron 2002; 36: 881-889. Zheng J et al. Neuron 2002; 36: 891-896.

[0008] To avoid misunderstandings due to different naming of the same proteins, isoform nomenclature for the mouse brain is as follows: HCN1 corresponds to HAC2 (mBCNG-1), HCN2 corresponds to HAC1 (mBCNG-2) and HCN3 corresponds to HAC3 (mBCNG4).

[0009] In certain diseased states, the heart's ability to pace properly is compromised. For example, failure of SA nodal automaticity, resulting in an insufficient number of electrical impulses emanating from the SA node, is the most common cause of bradyarrhythmias (heart rhythm that is too slow). If slowing is enough so that the resultant heart rate is insufficient to meet the body's demand, symptoms result. Symptomatic bradycardia originating from the sinus node is part of a clinical syndrome characterized by brady- and tachyarrhythmias originating from a diseased sinus node, commonly referred to as sick sinus syndrome. Clinically, sick sinus syndrome is a very common problem and accounts for approximately 70% of all pacemaker implants in the general population. Other bradyarrhythmic disease states due to slowed or absent impulse propagation include the various degrees of AV block (e.g. 1.sup.st, 2.sup.nd, or 3.sup.rd). Tachyarrhythmias (heart rhythm that is too fast) and fibrillation are also a concern. These conditions present major problems ranging from cost of treatment to diminished quality of life and even death.

[0010] Currently, bradyarrhythmias are most commonly treated by the implantation of (exogenously driven) electronic pacemaker. While improving the lives of many patients, implantable pacemakers have a limited lifetime and consequently may expose a patient to multiple surgeries to replace the implantable pacemaker. Biological methods of influencing the pacing rate of cardiac cells, however, have recently been developed, including the use of various drugs and pharmacological compositions. Developments in genetic engineering have resulted in methods for genetically modifying cardiac cells to influence their intrinsic pacing rate. For example, U.S. Pat. No. 6,214,620 describes a method for suppressing excitability of ventricular cells by over-expressing (e.g. K.sup.+ channels) or under-expressing certain ion channels (e.g. Na.sup.+ and Ca.sup.2+ channels). PCT Publication No. WO 02/087419 describes methods and systems for modulating electrical behavior of cardiac cells by genetic modification of inwardly rectifying K.sup.+ channels (specifically, I.sub.K1) in quiescent ventricular cells.

[0011] Of particular import to those who suffer from bradyarrhythmias due to insufficient production of I.sub.f; PCT Publication No. WO 02/098286 describes methods for regulating pacemaker function of cardiac cell via modulation of HCN channels (HCN 1, 2, or 4 isoforms). See also U.S. Patent Application No. 2002/0187948, PCT Application No. WO 02/087419 A2, U.S. Patent Application Publication No. US 2002/0155101A1 and U.S. Pat. No. 6,214,620.

[0012] Still, there is a need to improve current methods of using HCN to treat cardiac patients and create pacemaker current capable of being turned on, off and modulated as well as having the capability to react to physiological stimuli to ultimately restore physiological heart rates in patients suffering from arrhythmias.

SUMMARY OF THE INVENTION

[0013] The present invention is directed to methods of using HCN genes, variants or subunits thereof to treat a cardiac pacing dysfunction. The various isoforms of HCN that include HCN1, HCN2, HCN3 and HCN4, and modified HCN genes (e.g. truncated HCN4) may be combined to induce a pacemaker current and treat a patient in need thereof. In addition, HCN genes can be combined with other types of genes including genes that promote beta-adrenergic receptors or genes that suppress I.sub.k1 current to treat cardiac pacing dysfunction.

[0014] Specifically, genes that suppress or block I.sub.K1 may be combined with HCN genes including variants or subunits of the HCN isoforms. This combination may prevent an instable cycle length created by the HCN gene alone. Further, one or more HCN genes may be combined together with other channel-focused genes that encode beta-adrenergic receptors to create biopacemakers with physiological heart rate and rate responses. Modifying the ratios and doses of the aforementioned genes can modify the gene-based biological pacemaker to induce different pacemaker currents.

[0015] The subject invention includes a method of using HCN3 alone or in combination with other isoforms of HCN and/or other genes to treat cardiac pacing dysfunction. The subject invention further includes a method of using a truncated HCN4 gene alone or in combination with other isoforms and/or variants of HCN and/or other genes to treat cardiac pacing dysfunction.

[0016] Genes may be delivered to the heart via a construct that is transfected into a cell in vitro, or via gene therapy in vivo. The HCN gene induces a slow depolarizing diastolic pacemaker current in atrial, ventricular or conductive tissue.

[0017] Further, genes may be introduced into cells via a viral vector or comparable delivery system. The genes can be transfected into target cells such as endogenous cardiac cells (e.g., atrial or ventricular myocytes, cells of the conduction system including SAV, AVN and Purkinje system, cardiac fibroblasts, etc.), stem cells (e.g. autologeous, allogeneic or xenogeneic adult, fetal or embryonic stem cells), myoblasts or other cells. Endogenous cells such as atrial or ventricular cells are transfected using local delivery of a genetic therapy via catheter, direct injection, or equivalent delivery means. Other cells may be transfected outside of the body and then delivered to the heart using a catheter or equivalent means. For example, genetically modified cells may be delivered to the heart via self-fixating scaffolds.

[0018] Finally, by altering the molecular composition of the gene construct (e.g., adding certain promoters or regulatory elements to the HCN gene), the location, amount and characteristics of induced pacemaker current may be modified. Consequently, methods of subject invention may be specific for targeted cells instead of accidentally influencing, for example, a non-cardiac cell (e.g., a brain cell). Also, the pacemaker current can be regulated by controlling the expression of the transfected gene using, for example, pharmaceuticals that are directed towards the promoters of the transfected gene.

[0019] The foregoing has outlined rather broadly the features of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings, in which:

[0021] FIG. 1 is a diagram of a human heart.

[0022] FIG. 2 is a diagram of the right side of a heart in which a guiding catheter is positioned for delivery of the genetic construct of the invention.

[0023] FIG. 3 depicts an example of a generic viral vector expression cassette that includes a promotor, regulatory elements and a transgene.

[0024] FIG. 4 depicts an example of a specific viral vector expression cassette that includes a promotor, regulatory element and the HCN3 gene for transfection.

[0025] FIG. 5 is a recording of induced pacemaker current obtained from experiments using human embryonic kidney cells transfected with human HCN3 gene.

[0026] FIG. 6 is a recording of spontaneous action potential cycle lengths induced by HCN, I.sub.k1-block and a combination HCN expression and I.sub.k1-block.

[0027] FIG. 7 depicts an image showing green fluorescent expression four weeks after injection of recombinant adeno-associated virus encoding enhanced green fluorescent protein (rAAV-eGFP) in canine myocardium.

[0028] FIG. 8 depicts the complete length of native HCN4 compared to truncated HCN4.

[0029] FIG. 9 depicts the expression data of two trials of HCN3 as transfected Human Embryonic Kidney (HEK) 293 cells by Quantitative Real-time Polymerase Chain Reaction (Q RT PCR).

[0030] FIG. 10 depicts immunolabeling (c-myc antibody) of HEK 293 cells co-transduced cells with AAV1/2 HCN4tr and AAV1/2-eGFP.

[0031] FIG. 11 depicts eGFP-labeling of the HEK 293 cells shown in FIG. 11 co-transduced cells with AAV1/2-HCN4tr and AAV1/2-eGFP.

[0032] FIGS. 12A-D depict whole cell voltage clamp current traces of I.sub.f recorded from HL-5 cells.

[0033] FIGS. 13A-B depict comparisons of activation kinetics of I.sub.f recorded in control and cardiac HL-5 cells transfected with rAAV-HCN4tr.

[0034] FIG. 14 depicts HCN4 whole cell voltage-clamp electrophysiology data recorded from HEK 293 cells transfected with full plasmid HCN4.

[0035] FIG. 15 depicts HCN4 whole cell voltage-clamp electrophysiology data recorded from HEK 293 cells transfected with truncated plasmid HCN4.

[0036] FIG. 16 depicts HCN4 whole cell voltage-clamp electrophysiology data recorded from HEK 293 cells transfected with truncated HCN4-myc AAV.

[0037] FIG. 17 depicts HCN3 whole voltage-clamp electrophysiology data recorded from HEK 293 cells transfected with HCN3 AAV.

[0038] FIG. 18 depicts a pulse protocol for determining activation kinetics.

[0039] FIG. 19 depicts current recordings obtained using the protocol of FIG. 18 from truncated hHCN4 in pIRES2-EGFP.

[0040] FIG. 20 depicts another pulse protocol for determining reversal potential.

[0041] FIG. 21 depicts current recordings obtained using the protocol of FIG. 19 from truncated hHCN4 in pIRES2-EGFP.

[0042] FIG. 22 depicts voltage-dependent activation curves for HCN4 and HCN4 truncated.

[0043] FIG. 23 depicts time constants of activation .tau..sub.act at certain activation voltages for HCN4 and HCN4 truncated.

[0044] FIG. 24 depicts the reversal potential for both the full-length and truncated hHCN4.

DETAILED DESCRIPTION OF THE INVENTION

[0045] The subject invention is directed to methods of treating patients with cardiac dysfunction by administering one or more HCN genes or variants thereof, alone or in combination with other genes.

DEFINITIONS

[0046] The following definitions are provided to facilitate an understanding of the invention.

[0047] "AAV" is an adeno-associated virus vector. These viruses cause no known disease in humans, hold long-term expression, and theoretically integrate at specific sites.

[0048] "AdV" is an adenovirus vector. These viruses cause the common cold. They have efficient entry into most cell types and can infect non-dividing cells. For gene therapy, these vectors are made replication-deficient by specifically deleting viral genes (e.g., E1, E2, E3 and/or E4). These genetically engineered vectors do not cause the common cold, although immune reactions to viral genes expressed in host cells can be observed.

[0049] "cDNA" includes all nucleic acids that share the arrangement of sequence elements found in native mature messenger ribonucleic acid (RNA) species, where sequence elements are exons (e.g., sequences encoding open reading frames of the encoded polypeptide) and 3' and 5' non-coding regions. Normally mRNA species have contiguous exons, with the intervening introns removed by nuclear RNA splicing, to create a continuous open reading frame encoding the polypeptide of interest.

[0050] "Channel protein" or "Ion channel protein" refers to proteins that transportions across cell membranes.

[0051] "Chromosomes" are DNA molecules and their associated proteins. A gene is a unit of inheritance which occupies a specific locus on a chromosome and which has a specific sequence of nitrogenous bases. A genome is the total set of genes carried by an organism or cell.

[0052] "Construct" is a recombinant nucleic acid, generally recombinant DNA that has been generated for the expression of a specific nucleotide sequence(s), or is to be used in the construction of other recombinant nucleotide sequences.

[0053] "DNA," deoxyribonucleic acid, has a sugar group (deoxyribose) with the following nucleotide bases: adenine (A), guanine (G), thymine (T), and cytosine (C). RNA, ribonucleic acid, has ribose as the sugar group, and the same nucleotide bases, except uracil (U) replaces thymine. A single strand of DNA has a sequence of bases A, G, T, and C. When forming a DNA double-helix, for example, this secondary structure is held together by hydrogen bonds between bases on the neighboring strands. Note that in such base pairing, A always bonds to T and C always bonds to G.

[0054] "Coding sequence" refers to a nucleic acid sequence that is transcribed (in the case of DNA) and translated (in the case of mRNA) into a polypeptide, in vitro or in vivo, when placed under control of the appropriate regulatory sequences.

[0055] "Gap junction" refers to small pore-like proteins that connect cardiac muscle cells to each other.

[0056] "Gene" is a piece of DNA that encodes genetic traits and information.

[0057] "Gene cloning" is the process of identifying the gene responsible for a particular disease and synthesizing copies of it for use in treatment.

[0058] "Gene expression" describes the process by which a gene's coded information is converted into the structures present and operating in the cell. Expressed genes include those that are transcribed into mRNA and then translated into protein and those that are transcribed into RNA but not translated into protein (e.g., transfer and ribosomal RNAs).

[0059] "Gene therapy" is a technique for correcting genetic problems by introducing a "correct" copy of the gene into the patient's cells to compensate for their own defective gene. An alternative definition for "gene therapy" is the introduction of recombinant DNA into mammalian cells with the goal of modulating protein function (e.g., by expressing, replacing or suppressing a protein) for therapeutic purposes.

[0060] "Genome" is the complete set of genes in the chromosomes of each cell.

[0061] "Lentivirus" is a virus, such as HIV, that incorporates its passenger genes into non-dividing cells.

[0062] "Liposome" is a cationic lipid that is an artificially produced non-viral molecule vector that may transmit DNA to a cell. Sometimes this method is called facilitated DNA.

[0063] "Messenger ribonucleotide acid" or "mRNA" refers to RNA that serves as a template for protein synthesis.

[0064] "Nucleic acid" is a linear polymer of nucleotides (as in an oligomer, but longer) linked by 3',5' phosphodiester linkages.

[0065] "Nucleoside" is a purine or pyrimidine base linked glycosidically to ribose or deoxyribose.

[0066] "Nucleotide" is a phosphate ester of a nucleoside.

[0067] "Oligonucleotide" is a linear sequence of nucleotides, or mers, joined by phosphodiester bonds.

[0068] "PCR," or "polymerase chain reaction," is a system for in vitro amplification of DNA wherein two synthetic oligonucleotide primers, which are complimentary to two regions of the target DNA (one for each strand) to be amplified, are added to the target DNA in the presence of excess deoxynucleotides and Taq polymerase, a heat stable DNA polymerase. In a series of temperature cycles, the DNA is repeatedly denatured, annealed to the primers, and a daughter strand extended from the primers. As the daughter strands act as templates in subsequent cycles, amplification occurs in an exponential fashion. Since "traditional" PCR is a semi-quantative method at best, more recently, real-time (RT) PCR has been developed to allow quantification of RNA or DNA.

[0069] "Plasmid DNA" is circular DNA molecules typically found in bacteria.

[0070] "Polynucleotide" is an oligonucleotide, nucleotide, and fragments or portions thereof, as well as to peptide nucleic acids (PNA), fragments, portions or antisense molecules thereof, and DNA or RNA of genomic or synthetic origin which can be single- or double-stranded, and represent the sense or antisense strand.

[0071] "Promoter" is a minimal nucleotide sequence sufficient to direct transcription in a recombinant cell. "Promoter" is also meant to encompass those elements sufficient for promoter-dependent gene expression controllable for cell-type specific, tissue-specific or inducible by external signals or agents. Such elements may be located in the 5' or 3' regions of the native gene (e.g., enhancer elements).

[0072] "Regulatory gene or agent" is a gene with the primary function of controlling the rate of synthesis of the products of one or several other genes or pathways.

[0073] "Retrovirus" is a class of viruses that infects cells by inserting its own DNA into the genetic material of a host cell.

[0074] "Stem cells" are cells having the ability to divide for indefinite periods in culture and to give rise to specialized cells. Adult stem cells are undifferentiated cells found in a differentiated tissue that can renew itself and, with certain limitations, differentiate to yield all the specialized cell types of the tissue from which it originated. For example, adult resident cardiac stem cells have been identified. Bone marrow stromal cells are stem cells found in bone marrow that generate bone, cartilage, fat, and fibrous connective tissue. Mesenchymal stem cells are cells from the immature embryonic connective tissue. A number of cell types come from mesenchymal stem cells, including cardiac myocytes. Another example of adult stem cells are skeletal muscle progenitor cells. Embryonic stem cells are primitive, undifferentiated cells from the embryo that have the potential to become a wide variety of specialized cell types.

[0075] "Transformation", "transduction" or "transfection" refers to a permanent or transient genetic change induced in a cell following incorporation of a new nucleic acid (e.g., DNA or RNA exogenous to the cell). Genetic change can be accomplished either by incorporation of the new nucleic acid into the genome of the host cell, or by transient or stable maintenance of the new DNA as an episomal element.

[0076] "Transformed cell", "transfected cell" or "transduced cell" refers to a cell into which (or into an ancestor of which) has been introduced, by means of recombinant DNA techniques, a DNA molecule encoding a protein of interest.

[0077] "Transgene" is a gene that has other DNA inserted into it.

[0078] "Vector" refers to a means of transfecting cells with genetic material either in vivo or in vitro. Many such vectors are modified viruses.

The Cardiac Conduction System

[0079] FIG. 1 is a schematic diagram of a right side of a heart having an anterior-lateral wall peeled back to present a portion of a heart's intrinsic conduction system and chambers of a right atrium ("RA") 16 and a right ventricle ("RV") 18. Pertinent elements of the heart's intrinsic conduction system, illustrated, in FIG. 1, include a SA node 30, an AV node 32, a bundle of His 40, a right bundle branch 42, left bundle branches (not shown) and Purkinje fibers 46. SA node 30 is shown at a junction between a superior vena cava 14 and RA 16. An electrical impulse initiated at SA node 30 travels rapidly through RA 16 and a left atrium (not shown) to AV node 32. At AV node 32, the impulse slows to create a delay before passing on through a bundle of His 40, which branches, in an interventricular septum 17, into a right bundle branch 42 and a left bundle branch (not shown) and then, apically, into Purkinje fibers 46. Following the AVN delay, the impulse travels rapidly throughout RV 18 and a left ventricle (not shown). Flow of the electrical impulse described herein creates an orderly sequence of atrial and ventricular contraction and relation to efficiently pump blood through the heart. When a portion of the heart's intrinsic conduction system becomes dysfunctional, efficient pumping is compromised, potentially leading to symptoms which range from mild to life-threatening.

[0080] Typically, a patient, whose SA node 30 has become dysfunctional, may have an implantable pacemaker system implanted wherein lead electrodes are placed in an atrial appendage 15. The lead electrodes stimulate RA 16 downstream of dysfunctional SA node 30 and the stimulating pulse travels on to AV node 32, bundle of His 40, and Purkinje fibers 46 to restore physiological contraction of the heart. If a patient has a dysfunctional AV node 32, however, pacing in atrial appendage 15 will not be effective, since it is upstream of a block caused by the damage. In this situation, multiple chamber pacemaker system may be implanted (e.g. one pacemaker lead in the atrium, one in the ventricle), allowing for coordinated electromechanical activation of atria and ventricles.

[0081] Pacing at the bundle of His 40 provides the advantage of utilizing the normal conduction system of the heart to carry out ventricular depolarizations. In other words, stimulation provided at the bundle of His will propagate rapidly to the entire heart via the right bundle 42, the left bundle (not shown), and the Purkinje fibers. This provides synchronized and efficient ventricular contraction that is not replicated when the pacing is performed from the apex of the right ventricle because the electrical activity propagates via slowly conducting myocardial tissue as opposed to the rapidly conducting Purkinje network. By implanting biological pacemakers in or close to areas of physiological conduction (e.g. SAN, atrial septum, AVN, HIS bundle, Purkinje system), this principle could be applied to the current invention.

[0082] On the cellular level, electrical wave propagation occurs when cardiac cells allow a controlled flow of ions across the membranes through ion channels. This ion movement across the cell membrane results in changes in transmembrane potential (i.e., depolarization), which is a trigger for cell contraction. The heart cells can be categorized into several cell types (e.g. atrial, ventricular, etc.) and each cell type has its own characteristic variation in membrane potential. For example, ventricular cells have a resting potential of -85 mV. In response to an incoming depolarization wave front, these cells fire an action potential with a peak value of -20 mV and then begin to repolarize, which takes -350 ms to complete. In contrast, SA nodal cells do not have a stable resting potential and instead begin to spontaneously depolarize when their membrane potential reaches -50 mV. Cells, such as SA nodal cells, that do not have a stable resting transmembrane potential, but instead increase spontaneously to the threshold value, causing regenerative, repetitive depolarization, are said to display automacity.

[0083] Cardiac muscle cells are structurally connected to each other via small pore-like structures known as gap junctions. When a few cardiac cells depolarize, they act as a current source to adjacent cells causing them to depolarize as well; and these cells in turn impose on further adjacent cells, and so on. Once depolarization begins within a mass of cardiac cells, it spreads rapidly by cell-to-cell conduction until the entire mass is depolarized causing a mass of cardiac cells to contract in a coordinated fashion.

[0084] The cells in the SA node are specialized pacemaker cells and have the highest firing rate. Depolarization from these cells spreads across the atria. Since atrial muscle cells are not connected intimately with ventricular muscle cells, conduction does not spread directly to the ventricle. Instead, atrial depolarization enters the AV node, and after a brief delay, is passed on to the ventricles via the bundle of His and Purkinje network, initiating cellular depolarization along the endocardium. Depolarization then spreads by cell-to-cell conduction throughout the entire ventricular mass.

[0085] The SA node's unique cells include a combination of ion channels that endow it with its automacity. Some of the unique features of the SA node cells, relative to other myocardial cells, include the absence of Na.sup.+ channels (I.sub.Na) and inwardly rectifying K.sup.+ (I.sub.K1) channels. In the absence of sodium current, the upstroke of SA node action potential is primarily mediated by L-type Ca.sup.2+ channels (I.sub.caL). SA node cells do not have a stable resting potential because of their unique distribution of ion channels (e.g. lack of I.sub.K1, HCN expression). Consequently, they begin to depolarize immediately after the repolarization phase of the action potential is complete. The maximum diastolic potential for SA node cells is approximately -50 mV compared to -78 mV and -85 mV for atrial and ventricular cells, respectively. The slow depolarization phase is partially mediated by activation of the hyperpolarization-activated cyclic nucleotide channels (I.sub.f current) and T-type Ca.sup.2+ channels and deactivation of slow and rapid potassium channels (I.sub.Ks and I.sub.Kr, respectively), in conjunction with a lack of I.sub.K1 current which serves in non-automatic atrial and ventricular cardiac myocytes as a membrane potential stabilizing current. The rate of pacemaker discharge in the SA node in a normally functioning heart is approximately in the range of about 60 to 100 beats per minute at rest.

[0086] In a heart with dysfunctional SA node pacemaker function, the other structures of the heart with intrinsic pacemaking activity can take over the pacing function. The ectopically-driven escape rhythm produced by these structures, however, is slow (bradycardia) and normally not sufficient to support normal circulation (symptomatic bradycardia). A symptomatic bradycardia can manifest itself as syncope (temporary loss of consciousness) which may be life-threatening.

[0087] A method of the present invention includes genetically modifying the atrial cells, ventricular cells or cells of the cardiac conduction system, such as the Purkinje fibers, to modify the electrophysiology and pacing rate to resemble more closely the electrophysiology and pacing rate of the specialized pacemaker cells of the troubled SA or AV nodes. FIGS. 14 through 17 depict HCN3 and HCN4 single cell patch-clamp electrophysiology data for cells transduced with constructs containing HCN3, HCN4 and HCN4 truncated ("HCN4tr").

[0088] Native cells could also be transduced in a similar fashion. Subsequently their previously stable resting potential would be characterized by slow repeated phase 4 depolarizations and ultimately leading as the dominant pacemaker site of the heart. Similarly, cells could be stabily transduced with the constructs described in FIGS. 14-17, and then transplanted to the myocardium. These cells could, once electrically coupled to native cardiac cells, depolarize the native cells and induce biological pacemaking as described with the more classical gene therapy approach. If the transplanted cells are of a cardiac phenotype (such as c-kit positive cardiac stem cells), then these cells could act as pacemaker cells themselves since they would express the necessary ion channel proteins for action potential generation as well as electrical coupling (e.g. gap junction channel proteins).

Selection of Gene Construct

[0089] The human SA node does not consist of a group of uniform sinoatrial node cells embedded in atrial muscle. Instead, the SA node is a heterogeneous tissue with multiple cells types and a complex structure. From the periphery to the center of the SA node, there is a gradient in action potential shape, pacemaking, ionic current densities and connexin expression. In short, the SA node is a complex structure that, when afflicted with any level of dysfunction, may need to be augmented or replaced with several different types of genetic therapy to address the various problematic ion channels.

[0090] As previously noted, the HCN isoforms (e.g., HCN2 by itself instead of coupled to HCN4 in a functional heteromer) have different activation kinetics that consequently result in different HR ranges. Therefore, to simulate the complex SA node and its complex current, a variety of transfected genes may be required in a gene or cell therapy aimed at pacing dysfunction. Such a variety of genes can be obtained by using any one of the four different HCN isoforms, combinations of HCN isoforms in the form of heteromers or as multiple independent isoforms, or combinations of an HCN isoform or heteromer with other genes that affect heart rate. The heteromerization of the isoforms changes pacemaker electrophysiology via altered activation kinetics (e.g., allows for modulation (increase or decrease) of heart rate). Much B et al. J of Biol Chem; 44 (31): 43781-43786. While the exact stoichiometry of the heteromerized HCN channels has not been described yet, it is considered that these channels may form heteromers with a 3:1 ratio, but ratios of 1:1 or 1:3 are also possible as the HCN channels are known to form tetramers. In related rod photoreceptor cyclic nucleotide-gated channels, an asymmetrical stoichiometry of the two subunits present in the tetramers of 3:1 was determined. See, Zhong H et al. Nature 2002; 420: 193-196; See also, Weitz D et al. Neuron 2002; 36: 881-889 and Zheng J et al. Neuron 2002; 36: 891-896.

[0091] HCN3, or subunits thereof, is delivered to the heart in order to induce a slow depolarizing diastolic pacemaker current in atrial, ventricular or conductive tissue. See SEQ ID NO: 3. While HCN3 has not previously been considered as a gene therapy for pacing dysfunction, HCN3 can be used in a biopacemaker because, in part, HCN3 has similar kinetics to HCN2 (which is found in the heart). In fact, the homology between the two genes is approximately 86%. More importantly, the small current that is associated with HCN3 is significant in allowing for precise manipulation of biopacemaker current. Much et al., Role of Subunit Heteromerization and N-Linked Glycosylation in the Formation of Functional Hyperpolarization-activated Cyclic Nucleotide-Gated Channels, J. Biol. Chem. (2003) 278: 43781-43786. Furthermore, HCN3 is smaller in size than HCN1, HCN2 or HCN4. Consequently, it fits easily in a viral vector with limited "transgene carrying capacity" such as AAV. In addition, overexpression of HCN3 can strengthen the small current normally associated with the gene. Also, because HCN3 is not naturally present in the heart, but rather in the brain, a successful transfection of the gene into cardiac tissue is more readily identifiable than channels induced by, for example, HCN2, which are commonplace in cardiac tissue.

[0092] Various combinations of HCN genes (e.g., HCN3 and HCN4) may be delivered to the heart in order to induce a pacemaker current. See SEQ ID NOS: 1, 2 and 4. The HCN genes may work independently of one another or as functional heteromers. Different heteromers result in different voltage activation thresholds and channel kinetics that in turn result in different heart rate capacities. Other characteristic changes occur in the resultant AP associated with the transfected tissue. For example, certain HCN isoforms, such as HCN1, are not very responsive to cAMP whereas combining isoforms may result in a heteromeric channel which is more sensitive to cAMP.

[0093] Regarding heteromer formation, only one pair of channel subunits, HCN2 and HCN3, do not form a functional heteromer. HCN3 is resistant to forming heteromers. Therefore, as a consequence, expression is more predictable. Coexpression of HCN2 and HCN3 produces a current density less than that of cells that only express HCN2. The following combinations may all be used to vary the resultant current density: HCN1/HCN2, HCN1/HCN3, HCN1/HCN4, HCN2/HCN3, HCN2/HCN4 and HCN3/HCN4. When no heteromer is created, co-expression of two HCN genes still produces current levels that may be needed to obtain a desired pacemaker current. Coexpression of three or more subunits allows for further still more complicated channels with varying resultant pacemaker currents.

[0094] In mammalian hearts, different isoforms of HCN are being expressed. See review in Trends Cardiovasc Med. 2002 July; 12(5):206-12. For example, HCN2 is considered to be the primary isoform in atria and ventricles, while HCN4 is predominantly expressed in sinoatrial and atrioventricular nodal cells. Therefore, by administering an exogenous HCN isoform via gene therapy, it is very likely that heterodimer formation does occur in vivo. To proof this, we studied hyperpolarization activated (If) current in HL-5 cells, a cardiac cell line. See FIGS. 12 and 13. This cell line is a clone from HL-1 cells. In these cells, HCN expression has been shown, with the strongest signals for HCN2 mRNA, followed by HCN1 and little HCN3, and no HCN4. See, Journal of Physiology. 2002 545(1):81-92. Expression of HCN4 clearly changes the activation kinetics of If. See e.g., FIG. 12. The activation kinetics of endogenous HCN channels is distinct from HL-5 cells expressing HCN4-truncated. The resulting activation kinetics is also distinct from truncated HCN4 expressing HEK 293 cells. This suggests that heterodimer formation occurs also in vivo. This could be exploited therapeutically, for example by choosing different isoforms based on the specific delivery site (e.g. Purkinje system, AVN may require a different isoform than right atrial septum)

[0095] HCN genes or various combinations of HCN genes may also be combined with other genes and delivered to the heart in order to induce a pacemaker current. In addition, the non-HCN genes may be supplied independently of HCN genes. The non-HCN genes may, for example, increase the expression of a particular ion channel or suppress, in whole or in part, the expression of function of an ion channel. Such non-HCN genes can be made by traditional PCR-based amplification and known cloning techniques. Alternatively, such a gene or polynucleotide can be made by automated procedures that are well known in the art. Such a polynucleotide should include a start codon to initiate transcription and a stop codon to terminate translation.

[0096] One example of such a non-HCN gene encodes beta-adrenergic receptors (e.g., types 1 and 2) that increase HR when exposed to circulating catecholamines or norepinephrine that is released from sympathetic neurons. See SEQ ID NOS: 5-6.

[0097] Another example involves DNA that will suppress the KCNJ2 gene encoding for the inward potassium rectifier channel 2.1 (Kir2.1) that regulates I.sub.k1 current. See SEQ ID NO: 10. Voltage-gated potassium (K.sub.V) channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. This gene encodes a member of the potassium channel, voltage-gated, isk-related subfamily. This member is a small integral membrane subunit that assembles with the KCNJ2 gene product, a pore-forming protein, to alter its function. This gene is expressed in the heart and its mutations are associated with cardiac arrhythmia.

[0098] The import of using this gene is expression of HCN in the ventricle leads to an unstable cycle length in silico. If I.sub.k1 expression is decreased by about 50%, however, a stable cycle length (heart rate) is seen. See, FIG. 6. Moreover, if expression of I.sub.K1 is further decreased to levels at or below 20%, then automaticity occurs in normal ventricular or atrial myocytes. This latter approach is described in detail in concurrently filed U.S. patent application claiming priority to U.S. Pat. App. Ser. No. 60/532,764. By combining the suppression of I.sub.k1 with HCN expression, risks of action potential prolongation, increased dispersion of repolarization, ventricular tachycardia or fibrillation. and arrhythmogenesis may be further avoided. Therefore, a combination approach expression of HCN and suppression of I.sub.K1 is beneficial.

[0099] Other regulatory proteins include muscarinic (M2) and/or (M3) receptors for enhanced parasympathetic control that can result in a decreased HR. See SEQ ID NOS: 11-12. Muscarinic receptors influence many effects of acetylcholine in the central and peripheral nervous system. The muscarinic cholinergic receptor 2 is involved in mediation of bradycardia and a decrease in cardiac contractility. The muscarinic cholinergic receptors belong to a larger family of G protein-coupled receptors. A typical control signal mediated via the vagus nerve leads to a local release of acetylcholine (Ach) in the sinoatrial and atrioventricular nodes. Ach then binds to the M2 receptor, activates an inhibitory G protein (G.alpha.i), and essentially decreases the activity of adenylate cyclase, which directly leads to opening of K+ channels. In the sinoatrial node, vagal stimulation tends to flatten the diastolic depolarization, which then induces a slowing of heart rate (bradycardia, negative chronotropic effect), not only via the effects of reduced cAMP availability on if current (hyperpolarization activated cyclic nucleotide-gated channel), but also via activation of a potassium outward current. In the atrioventricular nodal tissue, vagal stimulation also activates an inhibitor G protein, which causes a slowing conduction velocity via a decreased calcium influx through L-type calcium channels. Clinically, the effects of vagal stimulation on the atrioventricular node are detected as increased atrioventricular nodal conduction times (e.g., prolonged PR interval).

[0100] In addition, the cells of the conduction system are genetically modified to increase the inward Ca.sup.2+ current by delivering a bio-pacemaker composition to these cells. As a specific example, for the Purkinje fibers, the composition includes a coding sequence that encodes a T-type Ca.sup.2+ channel resulting in the exogenous expression of T-type Ca.sup.2+ channels. More specifically, as an example, genes that promote T-type calcium channel overexpression (e.g., CaV3.1) are another example of this additional gene. Alpha-1 subunits of Ca(2+) channels, such as CACNA1H, consist of 4 homologous repeat domains. Each domain has six transmembrane segments, a highly conserved pore loop, and a distinctive voltage sensor. The voltage dependence and fast inactivation of CACNA1H results in transient, or T-type, electrical currents. See SEQ ID NOS: 7-8. Exogenous expression of this channel will facilitate the depolarization characteristics of, for example, Purkinje fiber cells necessary to increase their intrinsic pacing rate.

[0101] Another suitable polynucleotide encodes human voltage-gated channel (KCND3). See SEQ ID NO: 14. This is one of the subunits responsible for I.sub.to (transient outward current). It is beneficial to suppress this gene (e.g., via siRNA, via dominant negative approaches, via ribozyme) to prolong action potential durations thereby mimicking the electrophysiology of SA nodal cells.

[0102] Yet another gene is the Human K.sub.V channel interacting protein 2, SEQ ID NO: 15. This presents another option for modulating I.sub.to by suppressing this protein.

[0103] Non-human protein examples include, but are not limited to, Rabbit minK-related peptide, SEQ ID NO: 9, and HCN1, SEQ ID NO: 24, Rat HCN1-HCN4, SEQ ID NOS: 16-19, Mouse HCN1-HCN4, SEQ ID NOS: 20-23 and Rainbow Trout HCN1, SEQ ID NO: 25.

[0104] Other suitable polynucleotides useful in connection with the invention can be obtained from a variety of sources including, without limitation, GenBank (National Center for Biotechnology Information (NCBI)), EMBL data library, SWISS-PROT (University of Geneva, Switzerland), the PIR-International database; the American Type Culture Collection (ATCC) (10801 University Boulevard, Manassas, Va. 20110-2209); National Center of Biotechnology Information (http://www.ncbi.nlm.nih.gov/) and PubMed (http://www.ncbi.nim.nih.gov/entrez/query.fcgi?db=PubMed), both associated with the National Library of Medicine and National Institute of Health; PubMed.

Controlling the Selected Gene Construct

[0105] For site-specific expression of the transgene, tissue-specific promoters are made a part of the expression system. This tissue-specific expression significantly enhances the safety of the gene therapy as expression in non-target tissue becomes very unlikely.

[0106] For example, cardiac tissue specific promoters allow cardiac myocyte specific expression of the transgene of interest (including expression in stem cells with cardiac phenotype). As an example of one such promoter, a myosin heavy chain or myosin light chain promoter could be part of the expression system allowing transgene (e.g., HCN4) expression only in tissue containing this promoter (i.e., cardiac myocytes). Other examples of cardiac tissue specific promoters include, as examples, cardiac ankyrin repeat protein (U.S. Pat. No. 6,451,594), alpha-myosin heavy chain gene, beta-myosin heavy chain gene, myosin light chain 2 v gene a myosin light chain enhancer followed by either a myosin-heavy chain promoter or a viral promoter and a polynucleotide sequence (U.S. Published Patent Application 2002/025577 A1), myosin light chain 2a gene, cardiac alpha-actin gene, cardiac M2 muscarinic acetylcholine gene, ANF (ANP) atrial natriuretic factor (or peptide), cardiac troponin C, cardiac troponin I, cardiac troponin T or cardiac sarcoplasmic reticulum Ca-ATPase gene.

[0107] Specific promoters for the conductive system could also be employed if the site of the biological pacemaker is targeted at the cardiac conduction system. As an example, constructs of the present invention can be targeted to cells of the Purkinje network by methods known to those skilled in the art. Advantage can be taken of the expression of cell surface receptors unique to specific cells. For instance, one such receptor, preferentially expressed on the surface of Purkinje cells, is the cysteinyl leukotriene 2 receptor (CysLT.sub.2). This receptor distinguishes Purkinje cells from neighboring cells such as ventricular cells and can be utilized to target constructs of the invention preferentially to Purkinje cells. In the practice of the present invention, however, any receptor specific to Purkinje cells may be utilized for specific targeting.

[0108] Targeted delivery requires the modification of the vehicle delivering the construct (which will be more fully developed below). Several methods for modification of such vehicles are possible. For example, viral protein capsids or proteins of the viral envelope may be biotinylated for subsequent coupling to a biotinylated antibody directed against a specific receptor or ligand via a strepavidin bridge.

[0109] Alternatively, the viral delivery vehicle may be genetically modified so that it expresses a protein ligand for a specific receptor. The gene for the ligand is introduced within the coding sequence of a viral surface protein by, for example, insertional mutagenesis, such that a fusion protein including the ligand is expressed on the surface of the virus. For details on this technique see Han et al., "Ligand-Directed Retroviral Targeting of Human Breast Cancer Cells," Proc. Natl. Acad. Sci., 92:9747-9751 (1995). Viral delivery vehicles may also be genetically modified to express fusion proteins displaying, at a minimum, the antigen-binding site of an antibody directed against the target receptor. See e.g., Jiang et al., "Cell-Type-Specific Gene Transfer into Human Cells with Retroviral Vectors That Display Single-Chain Antibodies," J. Virol., 72: 10148-10156 (1998).

[0110] An embodiment of the invention may also involve regulation of the transgene via regulatory elements such as drug-sensitive elements (e.g., a drug-inducible suppressor or promoter). Drug-responsive promoters may induce or suppress gene expression. For example, a tetracycline responsive element (TRE) that binds doxycycline is present within the promoter construct. When doxycycline is removed, transcripton from the TRE is turned off in a highly dose-dependent manner. Examples of inducible drug-responsive promoters are the ecdysone-inducible promoter (U.S. Pat. No. 6,214,620) and rapamycin-dependent expression (U.S. Pat. No. 6,506,379). See Discher et al., J. Biol. Chem. (1998) 273:26087-26093; Prentice et al., Cardiovascular Res. (1997) 35: 567-576.

[0111] Other promoters, for example, would be sensitive to electrical stimulus that could be provided from, for example, an implantable device. Electrical stimulation can promote gene expression (U.S. Patent Application No. 2003/0204206 A1). This would allow for turning automaticity of the cells on and off, or modulating there between.

Delivering the Selected Gene Construct

[0112] The gene construct may be transfected into target cells such as endogenous cardiac cells (e.g., myocytes), stem cells, myoblasts or other cells. Endogenous cells such as atrial or ventricular cells or cells of the conduction system are transfected using local delivery of a genetic therapy via catheter, direct injection, or equivalent delivery means. Other cells may be transfected outside of the body and then delivered to the heart using a catheter or equivalent means. For example, as will be appreciated by those skilled in the art, cardiac myocardial cells derived from stem cells may be treated with the genetic procedures described herein and implanted into a region of the conduction system (e.g. Purkinje fiber) with a catheter or by direct injection to Purkinje fiber tissue.

[0113] The genetic construct can be delivered into a cell by, for example, transfection or transduction procedures. Transfection and transduction refer to the acquisition by a cell of new genetic material by incorporation of added nucleic acid molecules. Transfection can occur by physical or chemical methods. Many transfection techniques are known to those of ordinary skill in the art including, without limitation, calcium phosphate DNA co-precipitation, DEAE-dextrin DNA transfection, electroporation, naked plasmid adsorption, and cationic liposome-mediated transfection. Transduction refers to the process of transferring nucleic acid into a cell using a DNA or RNA virus. Suitable viral vectors for use as transducing agents include, but are not limited to, retroviral vectors, adeno associated viral vectors, vaccinia viruses, adenoviral viruses, epstein barr viruses, coxsackie viruses and sendai viruses.

[0114] The selection of a delivery means at the cellular level should address the length of desired expression. For example, where permanent pacing therapy is desired, an adeno-associated virus (AAV) encoding HCN4 and an additional AAV encoding regulatory receptor proteins, such as beta-adrenergic or muscarinic receptors, is implemented. AAVs have good long-term expression qualities because of their ability to integrate their genome into non-dividing cells in addition to their minimal immune response.

[0115] AAV vectors can be constructed using techniques well known in the art. Typically, the vector is constructed so as to provide operatively linked components of control elements. For example, a typical vector includes a transcriptional initiation region, a nucleotide sequence of the protein to be expressed, and a transcriptional termination region. Often, such an operatively linked construct will be flanked at its 5' and 3' regions with AAV ITR sequences, which are required viral cis elements. The control sequences can often be provided from promoters derived from viruses such as, polyoma, Adenovirus 2, cytomegalovirus, and Simian Virus 40. Viral regulatory sequences can be chosen to achieve a high level of expression in a variety of cells. Alternatively, ubiquitous expression promoters, such as the early cytomegalovirus promoter can be utilized to accomplish expression in any cell type. A third alternative is the use of promoters that drive tissue specific expression (addressed above). This approach is particularly useful where expression of the desired protein in non-target tissue may have deleterious effects. Thus, according to another preferred embodiment, the vector contains the proximal human brain natriuretic brain (hBNP) promoter that functions as a cardiac-specific promoter. For details on construction of such a vector. See, LaPointe et al., "Left Ventricular Targeting of Reporter Gene Expression In Vivo by Human BNP Promoter in an Adenoviral Vector," Am. J. Physiol. Heart Circ. Physiol., 283:H1439-45 (2002).

[0116] Vectors may also contain cardiac enhancers to increase the expression of the transgene in the targeted regions of the cardiac conduction system. Such enhancer elements may include the cardiac specific enhancer elements derived from Csx/Nkx2.5 regulatory regions disclosed in the published U.S. Patent Application 2002/0022259.

[0117] The subject invention may utilize an adeno-associated virus (AAV) but could also use a 2.sup.nd or 3.sup.rd generation adenovirus or others such as chimeric adeno-associated virus (AAV1/2) which is the chimeric product of AAV1 and AAV2 vectors. The AAV1 and AAV2 serotypes differ in composition of their capsid protein coat with resultant varying characteristics. The AAV2, for example, can be beneficial due to its known receptor binding and known approach for purification. AAV 1 allows for good muscle transfection. Cross-packaging of a single AAV type 2 vector genome into multiple AAV serotypes enables transduction with broad specificity. AAV 1/2 combines the advantages of these two vectors regarding, for example, purification and muscle transfection. FIG. 10 depicts an image of truncated HCN as expressed in cells that were transduced with constructs containing AAV1/2.

[0118] In one example of the invention, human HCN3 gene, SEQ ID NO: 3, can be cloned into a chimeric adeno-associated virus (AAV1/2) with the following sequence: AAV-CAG-humanHCN3-WPRE-BGHpolyA. A control vector encoding GFP is an adeno-associated virus (AAV1/2) with the following sequence: AAV-CAG-eGFP-WPRE-BGHpolyA. A CAG promoter (hybrid chicken B-actin/CMV enhancer) is used to achieve high transgene expression. Also, as a post-regulatory element, woodchuck postregulatory regulatory element (WPRE) can be used thereby allowing for increased transgene expression levels. Other common vectors are provided in U.S. Pat. Application No. US 2002/0155101A1. Suitable vectors can be obtained at GeneDetect.Com, 1455 Tallevast Road, Suite L8299, Sarasota, Fla. 34243 as well as other organizations known in the art.

[0119] When selecting a vector, using an AAV for example, a problem can arise if the HCN transgene does not fit into common AAV expression cassettes. Such problems are amplified when promoters and additional regulatory elements are included in the cassette. See, FIGS. 3 and 4. For example, when using GeneDetect's rAVE cassette, this problem is overcome with HCN3 (2,334 base pairs ("bp") by removing a regulatory element (e.g., SAR) from the cassette. For HCN2 (2,670 bp), an additional element (e.g., WPRE) can be left out. For large genes such as HCN4 (3,612 bp), however, the transgene size must be further reduced by truncating the very large C-terminus. In one embodiment, truncation of the sequence occurs not before the cAMP binding site which still allows for a functional gene. For example, with HCN2, by 2161-2670 may be truncated. Bp 1654-2010 is the cAMP binding site. As another example, with HCN3 bp 1813-2325 may be truncated. Bp 1306-1662 is the cAMP binding site. As an additional example, as depicted in FIG. 8, HCN4 may be truncated from base pair 3612 to base pair 2313. Here, base pairs 1807-2163 represent the cAMP binding site. As an additional example, with HCN1 the C-terminus, including the cAMP binding site, may also be truncated as this protein isoform demonstrates very little responsiveness to cAMP binding.

[0120] At the macro level (i.e., non-cellular level), various catheter means may be employed to deliver the gene construct to the heart tissue. FIG. 2 shows a guide catheter 90 being positioned for delivery of the genetic construct of the invention. A venous access site (not shown) for the catheter 90 may be in a cephalic or subclavian vein. Means used for venous access are well known in the art and include the Seldinger technique performed with a standard percutaneous introducer kit. The guide catheter 90 includes a lumen (not shown) extending from a proximal end (not shown) to a distal end 92 that slideably receives the delivery system 80. The guide catheter 90 may have an outer diameter between approximately 0.115 inches and 0.170 inches and be of a construction well known in the art. The distal end 92 of the guide catheter 90 may include an electrode (not shown) for mapping electrical activity in order to direct the distal end 92 to an implant site near certain pacing areas in the heart. Alternatively, a separate mapping catheter may be used within the lumen of the guide catheter 90 to direct the distal end 92 to an application site near certain areas of the heart. This method is well known in the art. Other catheter means are described in commonly-assigned co-pending U.S. patent application Ser. No. 10/262,046, filed Oct. 2, 2002; and Ser. No. 10/423,116, filed Apr. 23, 2003, both of which are incorporated herein by reference.

[0121] In short, delivery of a genetic construct can be carried out according to any method known in the art (e.g., syringe injection). It is only necessary that the genetic construct reach a small portion of the cells that are targeted for gene manipulation (e.g. cells of the Purkinje fibers). The genetic construct may be injected directly into the myocardium as described by R. J. Guzman et al., Circ. Res., 73:1202-1207 (1993). The delivery step may further include increasing microvascular permeability using routine procedures, including delivering at least one permeability agent prior to or during delivery of the genetic construct. Perfusion protocols useful with the methods of the invention are generally sufficient to deliver the genetic construct to at least about 10% of cardiac myocytes in the mammal. Methods for targeting non-viral vector genetic constructs to solid organs, for example, the heart, have been developed such as those described in U.S. Pat. No. 6,376,471. Additional non-injection methods for gene delivery include, but are not limited to, polymer-based gene-delivery (e.g. via coated devices, via biodegradable scaffolds), gene delivery via cells attached to a device or to a biodegradable scaffold, gene delivery via vascular or transvascular delivery into selected myocardial regions, gene delivery via aid of electroporation or gene delivery via other means.

[0122] As an example of solution concentrations and dosage levels, concentrations of 1.times.10.sup.7 to 1.times.10.sup.13 parts gene construct per 100 microliters of solution of phosphate buffered saline may be used in dosages of 20-200 microliters. Also, 1:1 concentrations of different HCN isoforms and other genes may be used (e.g., HCN4 and genes encoding beta-adrenergic receptors). Still, other concentrations and dosage levels will be apparent to those skilled in the art as the effective dose of the gene construct will be a function of the particular expressed gene(s), the particular cardiac arrhythmia to be targeted, the desired heart rate (e.g., 60-90 beats per minute at rest and appropriate modulation of heart rate during stress or exercise as well as during sleep), the patient and his or her clinical condition, weight, age and sex. Other examples include administering several dosages in several locations. For example, a primary biological pacemaker in the atrial septum may be utilized, and in case of AVN conduction block, a backup pacemaker (with a lower intrinsic rate) in the ventricle (e.g. myocardial cells of Purkinje system).

Verification of Enhanced Pacemaker Current

[0123] Methods for detecting modulation of the cells of the conduction system of the heart by electrophysiological assay methods relates to any conventional test used to determine the cardiac action potential characteristics, such as action potential duration (APD). Briefly, a standard electrophysiological assay includes the following steps: providing a mammalian heart (in vivo or ex vivo), delivering to the heart a genetic construct or modified cells of the invention, transferring the genetic construct and/or modified cells into the heart under conditions which can allow expression of an encoded amino acid sequence, and detecting the increase of electrical properties in the cells of the heart to which the genetic construct and/or modified cells were delivered, wherein at least one property is the pacing rate of the cells, relative to a baseline value. Baseline values will vary with respect to the particular target region chosen in the conduction system.

[0124] Additionally, modulation of cardiac electrical properties obtained with the methods of the invention may be observed by performing a conventional electrocardiogram (ECG) before and after administration of the genetic construct of the invention and inspecting the ECG results. ECG patterns from a heart's electrical excitation have been well studied. Various methods are known for analyzing ECG records to measure changes in the electrical potential in the heart associated with the spread of depolarization and repolarization through the heart muscle. A preferred method of monitoring the proper function of a biological pacemaker may be via an implantable pacemaker/defibrillator or an implantable loop-recorder (e.g. Medtronic's Reveal.TM.). Other methods include placement of endocardial mapping electrode catheters to various locations in the heart, and record an intrinsic local electrical signal (EGM). These procedures require venous or arterial access to the endocardium of the atrial or ventricular tissue. These mapping catheters can be used in conjunction with analog or digital systems which range from simple electrophysiological assessments (e.g. GE Prucka system) to more complex electroanatomical maps of the heart (e.g. Carto or Endocardial Solutions systems). Such mapping procedures are well known in the art.

[0125] For whole-cell voltage-clamp experiments, using the following as an example, experiments may be conducted at room temperature using traditional instrumentation known in the art such as, but without limitation, an Axon Instruments 200A amplifier and Nikon Inverted Microscope (100T). Borosilicate glass microelectrodes (1-3 Megaohms) can be sealed to the lipid bilayer membrane of cells and the transmembrane currents at various holding potentials can be measured via a small rupture within the seal. The cells can be bathed in an extracellular-like solution that may include, but is not limited to, the following reagents and concentrations (in millimolar): NaCl (110), MgCl2 (0.5), KCl (30), CaCl2 (1.8), Hepes (5), and pH=7.4 (w/NaOH). Likewise, the microelectrode inner lumen may contain, but is not limited to, the following reagents and concentrations (in millimolar): NaCl (10), MgCl2 (0.5), KCl (130), EGTA (1), Hepes (5), and pH=7.4 (w/KOH).

[0126] The voltage clamp protocol involves a holding potential of -40 mV (1 second) and then conducting sweeps (3 second duration) in -10 mV steps from -40 mV to -140 mV. The last step of the protocol is either holding it at -40 mV or at -140 mV for 1 second.

[0127] FIG. 5 shows one example of the aforementioned patch clamp experimentation. The recordings were obtained from whole-cell patch clamp experiments using human embryonic kidney 293 (HEK 293) cells that were co-transfected with an adeno-associated virus encoding enhanced green fluorescent protein (AAV1/2-CAG-eGFP) and an adeno-associated virus encoding the human HCN3 gene (AAV1/2-CAG-HCN3). When the cells were hyperpolarized to -140 mV, a slowly activating inward current was detected that was characteristic of HCN channels. No inward current was detected in control cells (not transfected cells) or cells transfected only with AAV-eGFP when the voltage was held at -140 mV (data not shown).

[0128] FIG. 7 depicts a fluorescence microscopic image demonstrating positive GFP expression four weeks after injection of rAAV-eGFP into canine myocardium.

Example I

[0129] HL-5 cells at passage 73 were cultured in gelatin-fibronectin coated 33 mm culture dishes. Cells were maintained in the medium (JRH Biosciences, Lenexa, Kans., USA), supplemented with 10% fetal bovine serum, 4 mM L-glutamine, 10 .mu.M noradrenaline (norepinephrine; Sigma Aldrich, St. Louis, USA) and penicillin-streptomycin. The medium was changed every 24 h. HL-5 cells at different passages (from 75 to 98) were splitted when they reached a state of confluence. Dissociated cells were either re-plated for a new passage or used for patch clamp experiments. Some cells were transfected with rAAV-HCN4tr-cmyc. Cells were cultured at 37.degree. C. under an atmosphere of 5% CO.sub.2 and 95% air with approximately 95% humidity.

[0130] After dissociation from a culture dish, cells were plated on gelatin/fibronectin-coated coverslips for patch-lamp experiments. During an experiment HL-5 cells plated on a coverslip were transported to a chamber mounted on the stage of a Nikon microscope. The chamber was continuously superfused (1 ml/min) with the Tyrode's solution, which contained (in mM): 140 NaCl, 5.4 KCl, 1.8 CaCl.sub.2, 1 MgCl.sub.2, 10 HEPES, and 10 glucose (pH 7.4 adjusted with NaOH). The whole-cell configuration of the patch-clamp technique (Hamill et al. 1981) was applied in the experiments. Briefly, glass electrodes (World Precision Instruments, Sarasota, Fla.) with 2-4 M.OMEGA. resistance were connected via a Ag--AgCl wire to an Axopatch 200A amplifier interfaced with a DigiData 1320 acquisition system. After forming a conventional "gigaohm" seal, electrode capacitance was compensated. Whole-cell configuration was achieved by rupturing the membrane with additional suction. Membrane capacitance and series resistance were compensated to reduce artifactual distortion. A perfusion system (Warner Instruments, Inc., Hamden, Conn., USA) was used to change the extracellular solution. Data were collected with the pCLAMP software (version 9.2, Axon Instruments, Foster City, Calif.). Experiments were conducted at room temperature (23.degree. C.).

[0131] Before electrical compensation, cell membrane capacitance (C.sub.m) was measured in each patched cells with the pCLAMP program. During recordings, the cells were superfused with the modified Tyrode's solution to measure I.sub.f. The bath solution contained (mM): NaCl 140; KCl 5.4; CaCl.sub.2 1.8; MgCl.sub.2 1; D-glucose 10; Hepes 10 (pH adjusted to 7.4 with NaOH) and supplemented with (mM): NiCl 2; BaCl.sub.2 2; CdCl 0.2; 4-aminopyridine 1 to eliminate Ca.sup.2+ current (T- and L-type), inward rectifier K.sup.+ current, I.sub.K1 and transient outward K.sup.+ current, I.sub.t0, respectively. KCl was increased to 25 mM to amplify I.sub.f. Pipette solution contained (mM): K-glutamate 130; KCl 15; NaCl 5; MgATP 5; MgCl.sub.2 1; EGTA 5; CaCl.sub.2 1; Hepes 10 (pH adjusted to 7.2 with KOH). I.sub.f currents were evoked by 2 to 6 s hyperpolarizing steps to potentials ranging from -50 to -130 mV from a holding potential of -40 mV. A single-exponential fit of the current traces evoked at different potentials allowed derivation of time constants (.tau.) of current activation. The initial delay of the current was excluded from the fitting.

[0132] The reversal potential of I.sub.f was evaluated by tail currents recorded by 1.2 s `tail` steps to membrane potentials ranging from -80 to 0 mV in 10 mV step intervals followed a 2 s conditioning potential step to -120 mV. The holding potential was set at -40 mV. The amplitudes of tail currents were then plotted against the test potentials. The current-voltage (1-V) relationship was fitted with a linear regression equation and the intersection on the x-axis was the reversal potential of I. The activation of I.sub.f was calculated by tail currents elicited by 3 s `tail` pulses to -120 mV followed 5 s conditioning pulses from -130 mV to -60 mV in 10 mV increments every 10 s. The holding potential was -40 mV. The amplitudes of tail currents were then normalized to the maximal current and plotted against the conditional pulses. Activation data were fitted by a Boltzmann function.

[0133] As shown in FIG. 12, current traces of I.sub.f recorded from HL-5 cells. A, the voltage-clamp protocol. B, superimposed I.sub.f traces were recorded from a non-transfected HL-5 cell. C, superimposed I.sub.f traces were recorded from a HCN4-transfected HL-5 cell. D, current-voltage relationships of I.sub.f were plotted according to the values measured at the places of the vertical dotted lines for the control (.smallcircle.) and HCN4-transfected ( ) HL-5 cells. Test pulses from -50 mV to -130 mV in 10 mV increments were applied. The holding potential was -40 mV and stimulation rate was 0.2 Hz. The arrows in panel A and B indicate the zero current level. The dotted horizontal line in panel D indicates the zero current level.

[0134] FIG. 13 provides a comparison of activation kinetics of I.sub.f recorded in control and HCN4-transfected HL-5 cells (using rAAV-HCN4tr-cmyc). Superimposed current traces were elicited by test pulses (see the insets) from -40 mV to -120 mV (A) and from -40 mV to -130 mV (B) for the control (black trace) and HCN4-transfected (red trace) HL-5 cells. The maximal currents recorded from the control cell were normalized (by 5.4-fold for -120 mV and 5.1-fold for -130 mV) close to the maximal current of the HCN4-transfected cell. Time constants (.tau.) of activation of I.sub.f were fitted with the equation of single exponential decay.

Example II

hHCN4-Channel Truncated Versus Full-Length hHCN4 Channel

[0135] Experiments were carried out to characterize the hHCN4-channel truncated 16 amino acids after the end of the cyclic nucleotide binding domain (CNBD). The truncated hHCN4 was compared to the full-length hHCN4 channel. See e.g., SEQ ID NOS. 4, 28 and 29. Electrophysiological experiments were carried out as described in Ludwig A., Zong X., Stieber J., Hullin R., Hofmann F. and Biel M., Two Pacemaker Channels From Human Heart With Profoundly Different Activation Kinetics, EMBO J. 1999, 19 (9):2323-2329 and Stieber J., Thomer A., Much B., Schneider A., Biel M. and Hofmann F., Molecular Basis For The Different Activation Kinetics of The Pacemaker Channels HCN2 and HCN4, J Biol Chem 2003, 278 (36):33672-33680.

[0136] Using the FuGENE6 transfection reagent (Roche), HEK 293 cells were transiently transfected with one of the following cDNA constructs: (1) hHCN4 in the expression vector pcDNA3; (2) hHCN4 in the expression vector pIRES2-EGFP (bicistronic); (3) hHCN4, truncated 16 amino acids after the end of the CNBD, in the expression vector pcDNA3; or (4) hHCN4, truncated 16 amino acids after the end of the CNBD, in the expression vector pIRES2-EGFP (bicistronic).

[0137] HEK 293-cells were cultured in Quantum 286 complete medium (PAA Laboratories) on polylysated glass coverslips and kept at 37.degree. C., 6% CO.sub.2 until ready to use. Two to three days after transfection currents were recorded in the whole cell recording technique at a temperature of 22.+-.1.degree. C.

[0138] The bath solution contained the following constituents in mM: 120 NaCl, 20 KCl, 1 MgCl.sub.2, 1.8 CaCl.sub.2, 10 HEPES, 10 Glucose, pH adjusted to 7.4 with NaOH. The pipette solution contained (in mM): 10 NaCl, 30 KCl, 90 K-Asp, 1 MgSO.sub.4, 5 EGTA, 10 HEPES, pH adjusted to 7.4 with KOH. Patch pipettes were pulled from borosilicate glass and had a resistance of 2-5 M.OMEGA. when filled with this pipette solution.

[0139] For determination of the effect of cAMP on the channels, 100 .mu.M 8-Br-cAMP (Sigma) was added to the bath solution. Data were acquired using an Axopatch 200B amplifier and pClamp7-software (Axon Instruments) and low-pass filtered at 2 kHz with an 8-pole Bessel filter (LPBF-48DG, npi). Data were evaluated using the Origin 6.0 software (Microcal). All values are provided as mean.+-.SEM (standard error of the mean); 11-19 measurements (n) were evaluated per channel. Statistical differences were determined using Student's unpaired t-test; p-values<0.05 were considered significant.

[0140] To characterize the basic properties of the channels, the following was determined: (1) voltage-dependent activation curves with half-maximal activation (V.sub.1/2); (2) voltage dependence of activation time constants T (activation kinetics) (both in the presence and absence of 100 .mu.M cAMP); and (3) current--voltage relation with reversal potential (E.sub.rev).

[0141] To determine activation curves and activation kinetics, a pulse protocol was used as shown in FIG. 18 where the holding potential was -40 mV and 10 mV-step pulses of 5 seconds duration from -140 mV to -30 mV, followed by a step to -140 mV for 2 seconds; 30 seconds between consecutive activation steps.

[0142] With the protocol shown in FIG. 18, example current recordings were obtained from the truncated hHCN4 in pIRES2-EGFP and are shown in FIG. 19.

[0143] Time constants of activation (T.sub.act) were obtained by fitting the current traces of the -140 to -90 mV steps after the initial lag with the sum of two exponential functions

y=A.sub.1e.sup.(x/.tau.1)+A.sub.2e.sup.(-x/.tau.2),

where T.sub.1 and T.sub.2 are the fast and slow time constants of activation, respectively; T.sub.1 is consequently referred to as T.sub.act since A.sub.1 accounts for most of the current amplitude.

[0144] To obtain voltage-dependent steady-state activation curves, tail currents measured immediately after the final step to -140 mV were normalized by the maximal current (I.sub.max) and plotted as a function of the preceding membrane potential. The curves were fitted with the Boltzmann function:

(I-I.sub.min)/(I.sub.man-I.sub.min)=(A.sub.1-A.sub.2)/(1+e.sup.(V-V1/2K)- )+A.sub.2,

where I.sub.min is an offset caused by a nonzero holding current and is not included in the current amplitude, V is the test potential, V.sub.1/2 is the membrane potential for half-maximal activation, and K is the slope factor.

[0145] To determine reversal potential, a pulse protocol was used as shown in FIG. 20 where the holding potential was -40 mV, the full activation of the channels held at -140 mV for 8 seconds, and 10 mV-step pulses to -100 mV to +40 mV and 30 seconds between consecutive activation steps.

[0146] With the protocol shown in FIG. 20, example current recording was obtained from the truncated hHCN4 in pIRES2-EGFP and is shown in FIG. 21.

[0147] To determine the reversal potential, the tail currents obtained immediately after the step to the test voltages were plotted against the voltage. Thus, E, is the potential where the current is 0.

[0148] The voltage-dependent activation results are shown in FIG. 22. Generally, the truncated hHCN4-channel ("hHCN4trunc", black circles) is voltage-dependently activated like the full-length hHCN4 ("hHCN4", blue squares). V.sub.1/2 (half-maximal activation or midpoint of activation) does not differ significantly between hHCN4 and hHCN4trunc, being about -96 mV for both. In addition, both channels are modulated by cAMP (open symbols) to the same extent, i.e. 100 .mu.M cAMP induces a shift of the activation curve of -13 mV towards more positive activation potentials. However, the slope factor k differs significantly, both between the two unmodulated and between the two cAMP-modulated curves. Thus, the slope of the full-length hHCN4 is slightly steeper than that of the truncated channel, implying that the truncated channel may be activated over a broader range of potentials. This is particularly important for the present invention because it suggests that the truncated human HCN4 channel is more responsive to cAMP at physiological voltages, thereby making it a more desirable gene candidate for a biological pacemaker therapy.

[0149] The following table gives the key parameters of the voltage-dependent activation:

TABLE-US-00001 Significance hHCN4, full length hHCN4, truncated of difference n = 19 n = 17 (p-value) unmodulated V.sub.1/2 -96.7 mV -96.1 mV P > 0.5 SD 4.01 3.44 SEM Slope factor K 11.0 14.3 P < 0.001 SD 1.15 2.45 SEM 0.31 0.71 cAMP - modulated V.sub.1/2 -83.7 mV -83.2 mV P > 0.5 SD 6.22 3.73 SEM 2.54 1.18 Slope factor K 9.1 12.7 P < 0.001 SD 1.33 2.11 SEM 0.47 0.67 Shift induced by 100 .mu.M 8-Br-cAMP: +13.0 mV +12.9 mV

[0150] Time constants of activation T.sub.act at activation voltages from -140 mV to -90 mV (note logarithmic scale of y-axis) are shown in FIG. 23. Both channels are modulated by cAMP, i.e., the time constants of activation over the whole range of potentials measured are shifted to smaller values. Therefore, the channels are 2- to 3-fold faster activated in the presence of cAMP. Comparing T.sub.act for each activation potential reveals that at potentials positive to -120 mV, the truncated hHCN4-channel tends to activate slightly faster than the full-length channel. This difference becomes significant only at -90 mV, both under nonmodulated and cAMP-modulated conditions.

[0151] As shown in FIG. 24, the reversal potential for both the full-length and truncated hHCN4 was determined in 20 mM extracellular potassium, without cAMP. It is -11.5 mV for hHCN4 and -16.2 mV for hHCN4trunc. The difference is not significant.

[0152] The human HCN4 channel, which is truncated 16 amino acids after the end of the cyclic nucleotide binding domain, can be well expressed in HEK 293-cells. The number of successfully transfected, i.e. HCN4-channel (current) and EGFP-(constructs in the pIRES2-EGFP-vector) expressing cells is approximately the same for all 4 tested constructs. Green-fluorescent cells can be well selected e.g. using excitation (filter) at .lamda.=450-490 nm and detection at A=505-530 nm).

[0153] Both the full-length and truncated constructs display similar, HCN4-like currents. The currents are of comparable amplitude and can be modulated by cAMP to the same extent. cAMP shifts the activation curve of both channels about 13 mV to more positive activation potentials and accelerates the activation about 2-3-fold (voltage dependent).

[0154] There is a slight but significant difference between the full-length and truncated hHCN4-channels. The slope of the voltage-dependent activation curve is steeper for the full-length channel. This could mean that the truncated hHCN4 channel can be activated over a broader range of membrane potentials even though this is not reflected in the value of the midpoint of activation V.sub.1/2 which is about -96 mV for both channels.

[0155] In addition to this difference in the voltage-dependent activation, there is a tendency for the truncated hHCN4-channel towards faster time constants of activation. This difference, however, is only significant at an activation potential of -90 mV.

[0156] All patents and publications referenced herein are hereby incorporated by reference. Referenced web sites are not incorporated by reference. It will be understood that certain of the above-described structures, functions and operations of the above-described preferred embodiments are not necessary to practice the present invention and are included in the description simply for completeness of an example embodiment or embodiments. In addition, it will be understood that specific structures, functions and operations set forth in the above-referenced patents and publications can be practiced in conjunction with the present invention, but they are not essential to its practice. It is therefore to be understood that within the scope of the claims, the invention may be practiced otherwise than as specifically described without actually departing from the spirit and scope of the present invention.

Sequence CWU 1

1

2912673DNAHomo Sapiensgene(1)..(2673)hyperpolarization activated cyclic nucleotide-gated potassium channel 1 (HCN1) (Accession NM 021072) 1atggaaggag gcggcaagcc caactcttcg tctaacagcc gggacgatgg caacagcgtc 60ttccccgcca aggcgtccgc gacgggcgcg gggccggccg cggccgagaa gcgcctgggc 120accccgccgg ggggcggcgg ggccggcgcg aaggagcacg gcaactccgt gtgcttcaag 180gtggacggcg gtggcggcgg tggcggcggc ggcggcggcg gcgaggagcc ggcggggggc 240ttcgaagacg ccgaggggcc ccggcggcag tacggcttca tgcagaggca gttcacctcc 300atgctgcagc ccggggtcaa caaattctcc ctccgcatgt ttgggagcca gaaggcggtg 360gaaaaggagc aggaaagggt taaaactgca ggcttctgga ttatccaccc ttacagtgat 420ttcaggtttt actgggattt aataatgctt ataatgatgg ttggaaatct agtcatcata 480ccagttggaa tcacattctt tacagagcaa acaacaacac catggattat tttcaatgtg 540gcatcagata cagttttcct attggacctg atcatgaatt ttaggactgg gactgtcaat 600gaagacagtt ctgaaatcat cctggacccc aaagtgatca agatgaatta tttaaaaagc 660tggtctgtgg ttgacttcat ctcatccatc ccagtggatt atatctttct tattgtagaa 720aaaggaatgg attctgaagt ttacaagaca gccagggcac ttcgcattgt gaggtttaca 780aaaattctca gtctcttgcg tttattacga ctttcaaggt taattagata catacatcaa 840tgggaagaga tattccacat gacatatgat ctcgccagtg cagtggtgag aatttttaat 900ctcatcggca tgatgctgct cctgtgccac tgggatggtt gtcttcagtt cttagtacca 960ctactgcagg acttcccacc agattgctgg gtgtctttaa atgaaatggt taatgattct 1020tggggaaagc agtattcata cgcactcttc aaagctatga gtcacatgct gtgcattggg 1080tatggagccc aagccccagt cagcatgtct gacctctgga ttaccatgct gagcatgatc 1140gtcggggcca cctgctatgc catgtttgtc ggccatgcca ccgctttaat ccagtctctg 1200gattcttcga ggcggcagta tcaagagaag tataagcaag tggaacaata catgtcattc 1260cataagttac cagctgatat gcgtcagaag atacatgatt actatgaaca cagataccaa 1320ggcaaaatct ttgatgagga aaatattctc aatgaactca atgatcctct gagaggggag 1380atagtcaact tcaactgtcg gaaactggtg gctacaatgc ctttatttgc taatgcggat 1440cctaattttg tgactgccat gctgagcaag ttgagatttg aggtgtttca acctggagat 1500tatatcgtac gagaaggagc cgtgggtaaa aaaatgtatt tcattcaaca cggtgttgct 1560ggtgtcatta caaaatccag taaagaaatg aagctgacag atggctctta ctttggagag 1620atttgcctgc tgaccaaagg acgtcgtact gccagtgttc gagctgatac atattgtcgt 1680ctttactcac tttccgtgga caatttcaac gaggtcccgg aggaatatcc aatgatgagg 1740agagcctttg agacagttgc cattgaccga ctagatcgaa taggaaagaa aaattcaatt 1800cttctgcaaa agttccagaa ggatctgaac actggtgttt tcaacaatca ggagaacgaa 1860atcctcaagc agattgtgaa acatgacagg gagatggtgc aggcaatcgc tcccatcaat 1920tatcctcaaa tgacaaccct gaattccgca tcgtctacta cgaccccgac ctcccgcatg 1980aggacacaat ctccaccggt gtacacagcg accagcctgt ctcacagcaa cctgcactcc 2040cccagtccca gcacacagac cccccagcca tcagccatcc tgtcaccctg ctcctacacc 2100accgcggtct gcagccctcc tgtacagagc cctctggccg ctcgaacttt ccactatgcc 2160tcccccaccg cctcccagct gtcactcatg caacagcagc cgcagcagca ggtacagcag 2220tcccagccgc cgcagactca gccacagcag ccgtccccgc agccacagac acctggcagc 2280tccacgccga aaaatgaagt gcacaagagc acgcaggcgc ttcacaacac caacctgacc 2340cgggaagtca ggccactctc cgcctcgcag ccctcgctgc cccatgaggt gcccactctg 2400atttccagac ctcatcccac tgtgggcgag tccctggcct ccatccctca acccgtgacg 2460gcggtccccg gaacgggcct tcaggcaggg ggcaggagca ctgtcccgca gcgcgtcacc 2520ctcttccgac agatgtcgtc gggagccatc cccccgaacc gaggagtccc tccagcaccc 2580cctccaccag cagctgctct tccaagagaa tcttcctcag tcttaaacac agacccagac 2640gcagaaaagc cacgatttgc ttcaaattta tga 267322670DNAHomo Sapiensgene(1)..(2670)Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 2 (HCN2) (Accession NM_001194) 2atggacgcgc gcgggggcgg cgggcggccc ggggagagcc cgggcgcgac ccccgcgccg 60gggccgccgc cgccgccgcc gcccgcgccc ccccaacagc agccgccgcc gccgccgccg 120cccgcgcccc ccccgggccc cgggcccgcg cccccccagc acccgccccg ggccgaggcg 180ttgcccccgg aggcggcgga tgagggcggc ccgcggggcc ggctccgcag ccgcgacagc 240tcgtgcggcc gccccggcac cccgggcgcg gcgagcacgg ccaagggcag cccgaacggc 300gagtgcgggc gcggcgagcc gcagtgcagc cccgcggggc ccgagggccc ggcgcggggg 360cccaaggtgt cgttctcgtg ccgcggggcg gcctcggggc ccgcgccggg gccggggccg 420gcggaggagg cgggcagcga ggaggcgggc ccggcggggg agccgcgcgg cagccaggcc 480agcttcatgc agcgccagtt cggcgcgctc ctgcagccgg gcgtcaacaa gttctcgctg 540cggatgttcg gcagccagaa ggccgtggag cgcgagcagg agcgcgtcaa gtcggcgggg 600gcctggatca tccacccgta cagcgacttc aggttctact gggacttcac catgctgctg 660ttcatggtgg gaaacctcat catcatccca gtgggcatca ccttcttcaa ggatgagacc 720actgccccgt ggatcgtgtt caacgtggtc tcggacacct tcttcctcat ggacctggtg 780ttgaacttcc gcaccggcat tgtgatcgag gacaacacgg agatcatcct ggaccccgag 840aagatcaaga agaagtatct gcgcacgtgg ttcgtggtgg acttcgtgtc ctccatcccc 900gtggactaca tcttccttat tgtggagaag ggcattgact ccgaggtcta caagacggca 960cgcgccctgc gcatcgtgcg cttcaccaag atcctcagcc tcctgcggct gctgcgcctc 1020tcacgcctga tccgctacat ccatcagtgg gaggagatct tccacatgac ctatgacctg 1080gccagcgcgg tgatgaggat ctgcaatctc atcagcatga tgctgctgct ctgccactgg 1140gacggctgcc tgcagttcct ggtgcctatg ctgcaggact tcccgcgcaa ctgctgggtg 1200tccatcaatg gcatggtgaa ccactcgtgg agtgaactgt actccttcgc actcttcaag 1260gccatgagcc acatgctgtg catcgggtac ggccggcagg cgcccgagag catgacggac 1320atctggctga ccatgctcag catgattgtg ggtgccacct gctacgccat gttcatcggc 1380cacgccactg ccctcatcca gtcgctggac tcctcgcggc gccagtacca ggagaagtac 1440aagcaggtgg agcagtacat gtccttccac aagctgccag ctgacttccg ccagaagatc 1500cacgactact atgagcaccg ttaccagggc aagatgtttg acgaggacag catcctgggc 1560gagctcaacg ggcccctgcg ggaggagatc gtcaacttca actgccggaa gctggtggcc 1620tccatgccgc tgttcgccaa cgccgacccc aacttcgtca cggccatgct gaccaagctc 1680aagttcgagg tcttccagcc gggtgactac atcatccgcg aaggcaccat cgggaagaag 1740atgtacttca tccagcacgg cgtggtcagc gtgctcacta agggcaacaa ggagatgaag 1800ctgtccgatg gctcctactt cggggagatc tgcctgctca cccggggccg ccgcacggcg 1860agcgtgcggg ccgacaccta ctgccgcctc tattcgctga gcgtggacaa cttcaacgag 1920gtgctggagg agtaccccat gatgcggcgc gccttcgaga cggtggccat cgaccgcctg 1980gaccgcatcg gcaagaagaa ttccatcctc ctgcacaagg tgcagcatga cctcaactcg 2040ggcgtattca acaaccagga gaacgccatc atccaggaga tcgtcaagta cgaccgcgag 2100atggtgcagc aggccgagct gggtcagcgc gtgggcctct tcccgccgcc gccgccgccg 2160ccgcaggtca cctcggccat cgccacgctg cagcaggcgg cggccatgag cttctgcccg 2220caggtggcgc ggccgctcgt ggggccgctg gcgctcggct cgccgcgcct cgtgcgccgc 2280ccgcccccgg ggcccgcacc tgccgccgcc tcacccgggc ccccgccccc cgccagcccc 2340ccgggcgcgc ccgccagccc ccgggcaccg cggacctcgc cctacggcgg cctgcccgcc 2400gccccccttg ctgggcccgc cctgcccgcg cgccgcctga gccgcgcgtc gcgcccactg 2460tccgcctcgc agccctcgct gcctcacggc gcccccggcc ccgcggcctc cacacgcccg 2520gccagcagct ccacaccgcg cttgaggccc acgcccgctg cccgggccgc cgcgcccagc 2580ccggaccgca gggactcggc ctcacccggc gccgccggcg gcctggaccc ccaggactcc 2640gcgcgctcgc gcctctcgtc caacttgtga 267032325DNAHomo Sapiensgene(1)..(2325)Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 3 (HCN3) (Accession NM_020897) 3atggaggcag agcagcggcc ggcggcgggg gccagcgaag gggcgacccc tggactggag 60gcggtgcctc ccgttgctcc cccgcctgcg accgcggcct caggtccgat ccccaaatct 120gggcctgagc ctaagaggag gcaccttggg acgctgctcc agcctacggt caacaagttc 180tcccttcggg tgttcggcag ccacaaagca gtggaaatcg agcaggagcg ggtgaagtca 240gcgggggcct ggatcatcca cccctacagc gacttccggt tttactggga cctgatcatg 300ctgctgctga tggtggggaa cctcatcgtc ctgcctgtgg gcatcacctt cttcaaggag 360gagaactccc cgccttggat cgtcttcaac gtattgtctg atactttctt cctactggat 420ctggtgctca acttccgaac gggcatcgtg gtggaggagg gtgctgagat cctgctggca 480ccgcgggcca tccgcacgcg ctacctgcgc acctggttcc tggttgacct catctcttct 540atccctgtgg attacatctt cctagtggtg gagctggagc cacggttgga cgctgaggtc 600tacaaaacgg cacgggccct acgcatcgtt cgcttcacca agatcctaag cctgctgagg 660ctgctccgcc tctcccgcct catccgctac atacaccagt gggaggagat ctttcacatg 720acctatgacc tggccagtgc tgtggttcgc atcttcaacc tcattgggat gatgctgctg 780ctatgtcact gggatggctg tctgcagttc ctggtgccca tgctgcagga cttccctccc 840gactgctggg tctccatcaa ccacatggtg aaccactcgt ggggccgcca gtattcccat 900gccctgttca aggccatgag ccacatgctg tgcattggct atgggcagca ggcacctgta 960ggcatgcccg acgtctggct caccatgctc agcatgatcg taggtgccac atgctacgcc 1020atgttcatcg gccatgccac ggcactcatc cagtccctgg actcttcccg gcgtcagtac 1080caggagaagt acaagcaggt ggagcagtac atgtccttcc acaagctgcc agcagacacg 1140cggcagcgca tccacgagta ctatgagcac cgctaccagg gcaagatgtt cgatgaggaa 1200agcatcctgg gcgagctgag cgagccgctt cgcgaggaga tcattaactt cacctgtcgg 1260ggcctggtgg cccacatgcc gctgtttgcc catgccgacc ccagcttcgt cactgcagtt 1320ctcaccaagc tgcgctttga ggtcttccag ccgggggatc tcgtggtgcg tgagggctcc 1380gtggggagga agatgtactt catccagcat gggctgctca gtgtgctggc ccgcggcgcc 1440cgggacacac gcctcaccga tggatcctac tttggggaga tctgcctgct aactaggggc 1500cggcgcacag ccagtgttcg ggctgacacc tactgccgcc tttactcact cagcgtggac 1560catttcaatg ctgtgcttga ggagttcccc atgatgcgcc gggcctttga gactgtggcc 1620atggatcggc tgctccgcat cggcaagaag aattccatac tgcagcggaa gcgctccgag 1680ccaagtccag gcagcagtgg tggcatcatg gagcagcact tggtgcaaca tgacagagac 1740atggctcggg gtgttcgggg tcgggccccg agcacaggag ctcagcttag tggaaagcca 1800gtactgtggg agccactggt acatgcgccc cttcaggcag ctgctgtgac ctccaatgtg 1860gccattgccc tgactcatca gcggggccct ctgcccctct cccctgactc tccagccacc 1920ctccttgctc gctctgcttg gcgctcagca ggctctccag cttccccgct ggtgcccgtc 1980cgagctggcc catgggcatc cacctcccgc ctgcccgccc cacctgcccg aaccctgcac 2040gccagcctat cccgggcagg gcgctcccag gtctccctgc tgggtccccc tccaggagga 2100ggtggacggc ggctaggacc tcggggccgc ccactctcag cctcccaacc ctctctgcct 2160cagcgggcaa caggcgatgg ctctcctggg cgtaagggat caggaagtga gcggctgcct 2220ccctcagggc tcctggccaa acctccaagg acagcccagc cccccaggcc accagtgcct 2280gagccagcca caccccgggg tctccagctt tctgccaaca tgtaa 232543612DNAHomo Sapiensgene(1)..(3612)Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 4 (HCN4) (Accession NM_005477) 4atggacaagc tgccgccgtc catgcgcaag cggctctaca gcctcccgca gcaggtgggg 60gccaaggcgt ggatcatgga cgaggaagag gacgccgagg aggagggggc cgggggccgc 120caagacccca gccgcaggag catccggctg cggccactgc cctcgccctc cccctcggcg 180gccgcgggtg gcacggagtc ccggagctcg gccctcgggg cagcggacag cgaagggccg 240gcccgcggcg cgggcaagtc cagcacgaac ggcgactgca ggcgcttccg cgggagcctg 300gcctcgctgg gcagccgggg cggcggcagc ggcggcacgg ggagcggcag cagtcacgga 360cacctgcatg actccgcgga ggagcggcgg ctcatcgccg agggcgacgc gtcccccggc 420gaggacagga cgcccccagg cctggcggcc gagcccgagc gccccggcgc ctcggcgcag 480cccgcagcct cgccgccgcc gccccagcag ccaccgcagc cggcctccgc ctcctgcgag 540cagccctcgg tggacaccgc tatcaaagtg gagggaggcg cggctgccgg cgaccagatc 600ctcccggagg ccgaggtgcg cctgggccag gccggcttca tgcagcgcca gttcggggcc 660atgctccaac ccggggtcaa caaattctcc ctaaggatgt tcggcagcca gaaagccgtg 720gagcgcgaac aggagagggt caagtcggcc ggattttgga ttatccaccc ctacagtgac 780ttcagatttt actgggacct gaccatgctg ctgctgatgg tgggaaacct gattatcatt 840cctgtgggca tcaccttctt caaggatgag aacaccacac cctggattgt cttcaatgtg 900gtgtcagaca cattcttcct catcgacttg gtcctcaact tccgcacagg gatcgtggtg 960gaggacaaca cagagatcat cctggacccg cagcggatta aaatgaagta cctgaaaagc 1020tggttcatgg tagatttcat ttcctccatc cccgtggact acatcttcct cattgtggag 1080acacgcatcg actcggaggt ctacaagact gcccgggccc tgcgcattgt ccgcttcacg 1140aagatcctca gcctcttacg cctgttacgc ctctcccgcc tcattcgata tattcaccag 1200tgggaagaga tcttccacat gacctacgac ctggccagcg ccgtggtgcg catcgtgaac 1260ctcatcggca tgatgctcct gctctgccac tgggacggct gcctgcagtt cctggtaccc 1320atgctacagg acttccctga cgactgctgg gtgtccatca acaacatggt gaacaactcc 1380tgggggaagc agtactccta cgcgctcttc aaggccatga gccacatgct gtgcatcggc 1440tacgggcggc aggcgcccgt gggcatgtcc gacgtctggc tcaccatgct cagcatgatc 1500gtgggtgcca cctgctacgc catgttcatt ggccacgcca ctgccctcat ccagtccctg 1560gactcctccc ggcgccagta ccaggaaaag tacaagcagg tggagcagta catgtccttt 1620cacaagctcc cgcccgacac ccggcagcgc atccacgact actacgagca ccgctaccag 1680ggcaagatgt tcgacgagga gagcatcctg ggcgagctaa gcgagcccct gcgggaggag 1740atcatcaact ttaactgtcg gaagctggtg gcctccatgc cactgtttgc caatgcggac 1800cccaacttcg tgacgtccat gctgaccaag ctgcgtttcg aggtcttcca gcctggggac 1860tacatcatcc gggaaggcac cattggcaag aagatgtact tcatccagca tggcgtggtc 1920agcgtgctca ccaagggcaa caaggagacc aagctggccg acggctccta ctttggagag 1980atctgcctgc tgacccgggg ccggcgcaca gccagcgtga gggccgacac ctactgccgc 2040ctctactcgc tgagcgtgga caacttcaat gaggtgctgg aggagtaccc catgatgcga 2100agggccttcg agaccgtggc gctggaccgc ctggaccgca ttggcaagaa gaactccatc 2160ctcctccaca aagtccagca cgacctcaac tccggcgtct tcaactacca ggagaatgag 2220atcatccagc agattgtgca gcatgaccgg gagatggccc actgcgcgca ccgcgtccag 2280gctgctgcct ctgccacccc aacccccacg cccgtcatct ggaccccgct gatccaggca 2340ccactgcagg ctgccgctgc caccacttct gtggccatag ccctcaccca ccaccctcgc 2400ctgcctgctg ccatcttccg ccctccccca ggatctgggc tgggcaacct cggtgccggg 2460cagacgccaa ggcacctgaa acggctgcag tccctgatcc cttctgcgct gggctccgcc 2520tcgcccgcca gcagcccgtc ccaggtggac acaccgtctt catcctcctt ccacatccaa 2580cagctggctg gattctctgc ccccgctgga ctgagcccac tcctgccctc atccagctcc 2640tccccacccc ccggggcctg tggctccccc tcggctccca caccatcagc tggcgtagcc 2700gccaccacca tagccgggtt tggccacttc cacaaggcgc tgggtggctc cctgtcctcc 2760tccgactctc ccctgctcac cccgctgcag ccaggcgccc gctccccgca ggctgcccag 2820ccatctcccg cgccacccgg ggcccgggga ggcctgggac tcccggagca cttcctgcca 2880cccccaccct catccagatc cccgtcatct agccccgggc agctgggcca gcctcccggg 2940gagttgtccc taggtctggc cactggccca ctgagcacgc cagagacacc cccacggcag 3000cctgagccgc cgtcccttgt ggcaggggcc tctggggggg cttcccctgt aggctttact 3060ccccgaggag gtctcagccc ccctggccac agcccaggcc ccccaagaac cttcccgagt 3120gccccgcccc gggcctctgg ctcccacgga tccttgctcc tgccacctgc atccagcccc 3180ccaccacccc aggtccccca gcgccggggc acacccccgc tcacccccgg ccgcctcacc 3240caggacctca agctcatctc cgcgtctcag ccagccctgc ctcaggacgg ggcgcagact 3300ctccgcagag cctccccgca ctcctcaggg gagtccatgg ctgccttccc gctcttcccc 3360agggctgggg gtggcagcgg gggcagtggg agcagcgggg gcctcggtcc ccctgggagg 3420ccctatggtg ccatccccgg ccagcacgtc actctgcctc ggaagacatc ctcaggttct 3480ttgccacccc ctctgtcttt gtttggggca agagccacct cttctggggg gccccctctg 3540actgctggac cccagaggga acctggggcc aggcctgagc cagtgcgctc caaactgcca 3600tccaatctat ga 361251434DNAHomo Sapiensgene(1)..(1434)beta-1 adrenergic receptor, coding sequence (Accession NM 000684) 5atgggcgcgg gggtgctcgt cctgggcgcc tccgagcccg gtaacctgtc gtcggccgca 60ccgctccccg acggcgcggc caccgcggcg cggctgctgg tgcccgcgtc gccgcccgcc 120tcgttgctgc ctcccgccag cgaaagcccc gagccgctgt ctcagcagtg gacagcgggc 180atgggtctgc tgatggcgct catcgtgctg ctcatcgtgg cgggcaatgt gctggtgatc 240gtggccatcg ccaagacgcc gcggctgcag acgctcacca acctcttcat catgtccctg 300gccagcgccg acctggtcat ggggctgctg gtggtgccgt tcggggccac catcgtggtg 360tggggccgct gggagtacgg ctccttcttc tgcgagctgt ggacctcagt ggacgtgctg 420tgcgtgacgg ccagcatcga gaccctgtgt gtcattgccc tggaccgcta cctcgccatc 480acctcgccct tccgctacca gagcctgctg acgcgcgcgc gggcgcgggg cctcgtgtgc 540accgtgtggg ccatctcggc cctggtgtcc ttcctgccca tcctcatgca ctggtggcgg 600gcggagagcg acgaggcgcg ccgctgctac aacgacccca agtgctgcga cttcgtcacc 660aaccgggcct acgccatcgc ctcgtccgta gtctccttct acgtgcccct gtgcatcatg 720gccttcgtgt acctgcgggt gttccgcgag gcccagaagc aggtgaagaa gatcgacagc 780tgcgagcgcc gtttcctcgg cggcccagcg cggccgccct cgccctcgcc ctcgcccgtc 840cccgcgcccg cgccgccgcc cggacccccg cgccccgccg ccgccgccgc caccgccccg 900ctggccaacg ggcgtgcggg taagcggcgg ccctcgcgcc tcgtggccct acgcgagcag 960aaggcgctca agacgctggg catcatcatg ggcgtcttca cgctctgctg gctgcccttc 1020ttcctggcca acgtggtgaa ggccttccac cgcgagctgg tgcccgaccg cctcttcgtc 1080ttcttcaact ggctgggcta cgccaactcg gccttcaacc ccatcatcta ctgccgcagc 1140cccgacttcc gcaaggcctt ccagggactg ctctgctgcg cgcgcagggc tgcccgccgg 1200cgccacgcga cccacggaga ccggccgcgc gcctcgggct gtctggcccg gcccggaccc 1260ccgccatcgc ccggggccgc ctcggacgac gacgacgacg atgtcgtcgg ggccacgccg 1320cccgcgcgcc tgctggagcc ctgggccggc tgcaacggcg gggcggcggc ggacagcgac 1380tcgagcctgg acgagccgtg ccgccccggc ttcgcctcgg aatccaaggt gtag 143461242DNAHomo Sapiensgene(1)..(1242)beta-2 adrenergic receptor, coding sequence (Accession NM 000024) 6atggggcaac ccgggaacgg cagcgccttc ttgctggcac ccaatagaag ccatgcgccg 60gaccacgacg tcacgcagca aagggacgag gtgtgggtgg tgggcatggg catcgtcatg 120tctctcatcg tcctggccat cgtgtttggc aatgtgctgg tcatcacagc cattgccaag 180ttcgagcgtc tgcagacggt caccaactac ttcatcactt cactggcctg tgctgatctg 240gtcatgggcc tggcagtggt gccctttggg gccgcccata ttcttatgaa aatgtggact 300tttggcaact tctggtgcga gttttggact tccattgatg tgctgtgcgt cacggccagc 360attgagaccc tgtgcgtgat cgcagtggat cgctactttg ccattacttc acctttcaag 420taccagagcc tgctgaccaa gaataaggcc cgggtgatca ttctgatggt gtggattgtg 480tcaggcctta cctccttctt gcccattcag atgcactggt accgggccac ccaccaggaa 540gccatcaact gctatgccaa tgagacctgc tgtgacttct tcacgaacca agcctatgcc 600attgcctctt ccatcgtgtc cttctacgtt cccctggtga tcatggtctt cgtctactcc 660agggtctttc aggaggccaa aaggcagctc cagaagattg acaaatctga gggccgcttc 720catgtccaga accttagcca ggtggagcag gatgggcgga cggggcatgg actccgcaga 780tcttccaagt tctgcttgaa ggagcacaaa gccctcaaga cgttaggcat catcatgggc 840actttcaccc tctgctggct gcccttcttc atcgttaaca ttgtgcatgt gatccaggat 900aacctcatcc gtaaggaagt ttacatcctc ctaaattgga taggctatgt caattctggt 960ttcaatcccc ttatctactg ccggagccca gatttcagga ttgccttcca ggagcttctg 1020tgcctgcgca ggtcttcttt gaaggcctat gggaatggct actccagcaa cggcaacaca 1080ggggagcaga gtggatatca cgtggaacag gagaaagaaa ataaactgct gtgtgaagac 1140ctcccaggca cggaagactt tgtgggccat caaggtactg tgcctagcga taacattgat 1200tcacaaggga ggaattgtag tacaaatgac tcactgctgt aa 124277062DNAHomo Sapiensgene(1)..(7062)T-type calcium channel alpha 1H subunit (CACNA1H), mRNA (Accession AF051946) 7atgaccgagg gcgcacgggc cgccgacgag gtccgggtgc ccctgggcgc gccgccccct 60ggccctgcgg cgttggtggg ggcgtccccg gagagccccg gggcgccggg

acgcgaggcg 120gagcgggggt ccgagctcgg cgtgtcaccc tccgagagcc cggcggccga gcgcggcgcg 180gagctgggtg ccgacgagga gcagcgcgtc ccgtacccgg ccttggcggc cacggtcttc 240ttctgcctcg gtcagaccac gcggccgcgc agctggtgcc tccggctggt ctgcaaccca 300tggttcgagc acgtgagcat gctggtaatc atgctcaact gcgtgaccct gggcatgttc 360cggccctgtg aggacgttga gtgcggctcc gagcgctgca acatcctgga ggcctttgac 420gccttcattt tcgccttttt tgcggtggag atggtcatca agatggtggc cttggggctg 480ttcgggcaga agtgttacct gggtgacacg tggaacaggc tggatttctt catcgtcgtg 540gcgggcatga tggagtactc gttggacgga cacaacgtga gcctctcggc tatcaggacc 600gtgcgggtgc tgcggcccct ccgcgccatc aaccgcgtgc ctagcatgcg gatcctggtc 660actctgctgc tggatacgct gcccatgctc gggaacgtcc ttctgctgtg cttcttcgtc 720ttcttcattt tcggcatcgt tggcgtccag ctctgggctg gcctcctgcg gaaccgctgc 780ttcctggaca gtgcctttgt caggaacaac aacctgacct tcctgcggcc gtactaccag 840acggaggagg gcgaggagaa cccgttcatc tgctcctcac gccgagacaa cggcatgcag 900aagtgctcgc acatccccgg ccgccgcgag ctgcgcatgc cctgcaccct gggctgggag 960gcctacacgc agccgcaggc cgagggggtg ggcgctgcac gcaacgcctg catcaactgg 1020aaccagtact acaacgtgtg ccgctcgggt gactccaacc cccacaacgg tgccatcaac 1080ttcgacaaca tcggctacgc ctggatcgcc atcttccagg tgatcacgct ggaaggctgg 1140gtggacatca tgtactacgt catggacgcc cactcattct acaacttcat ctatttcatc 1200ctgctcatca tcgtgggctc cttcttcatg atcaacctgt gcctggtggt gattgccacg 1260cagttctcgg agacgaagca gcgggagagt cagctgatgc gggagcagcg ggcacgccac 1320ctgtccaacg acagcacgct ggccagcttc tccgagcctg gcagctgcta cgaagagctg 1380ctgaagtacg tgggccacat attccgcaag gtcaagcggc gcagcttgcg cctctacgcc 1440cgctggcaga gccgctggcg caagaaggtg gaccccagtg ctgtgcaagg ccagggtccc 1500gggcaccgcc agcgccgggc aggcaggcac acagcctcgg tgcaccacct ggtctaccac 1560caccatcacc accaccacca ccactaccat ttcagccatg gcagcccccg caggcccggc 1620cccgagccag gcgcctgcga caccaggctg gtccgagctg gcgcgccccc ctcgccacct 1680tccccaggcc gcggaccccc cgacgcagag tctgtgcaca gcatctacca tgccgactgc 1740cacatagagg ggccgcagga gagggcccgg gtggcacatg ccgcagccac tgctgctgcc 1800agcctcaggc tggccacagg gctgggcacc atgaactacc ccacgatcct gccctcaggg 1860gtgggcagcg gcaaaggcag caccagcccc ggacccaagg ggaagtgggc cggtggaccg 1920ccaggcaccg gggggcacgg cccgttgagc ttgaacagcc ctgatcccta cgagaagatc 1980ccgcatgtgg ccggggagca tggactgggc caagcccctg gccatctgtc gggcctcagt 2040gtgccctgcc ccctgcccag ccccccagcg ggcacactga cctgtgagct gaagagctgc 2100ccgtactgca cccgtgccct ggaggacccg gagggtgagc tcagcggctc ggaaagtgga 2160gactcagatg gccgtggcgt ctatgaattc acgcaggacg tccggcacgg tgaccgctgg 2220gaccccacgc gaccaccccg tgcgacggac acaccaggcc caggcccagg cagcccccag 2280cggcgggcac agcagagggc agccccgggc gagccaggct ggatgggccg cctctgggtt 2340accttcagcg gcaagctgcg ccgcatcgtg gacagcaagt acttcagccg tggcatcatg 2400atggccatcc ttgtcaacac gctgagcatg ggcgtggagt accatgagca gcccgaggag 2460ctgactaatg ctctggagat cagcaacatc gtgttcacca gcatgtttgc cctggagatg 2520ctgctgaagc tgctggcctg cggccctctg ggctacatcc ggaacccgta caacatcttc 2580gacggcatca tcgtggtcat cagcgtctgg gagatcgtgg ggcaggcgga cggtggcttg 2640tctgtgctgc gcaccttccg gctgctgcgt gtgctgaagc tggtgcgctt tctgccagcc 2700ctgcggcgcc agctcgtggt gctggtgaag accatggaca acgtggctac cttctgcacg 2760ctgctcatgc tcttcatttt catcttcagc atcctgggca tgcacctttt cggctgcaag 2820ttcagcctga agacagacac cggagacacc gtgcctgaca ggaagaactt cgactccctg 2880ctgtgggcca tcgtcaccgt gttccagatc ctgacccagg aggactggaa cgtggtcctg 2940tacaacggca tggcctccac ctcctcctgg gccgccctct acttcgtggc cctcatgacc 3000ttcggcaact atgtgctctt caacctgctg gtggccatcc tcgtggaggg cttccaggcg 3060gagggcgatg ccaacagatc cgacacggac gaggacaaga cgtcggtcca cttcgaggag 3120gacttccaca agctcagaga actccagacc acagagctga agatgtgttc cctggccgtg 3180acccccaacg ggcacctgga gggacgaggc agcctgtccc ctcccctcat catgtgcaca 3240gctgccacgc ccatgcctac ccccaagagc tcaccattcc tggatgcagc ccccagcctc 3300ccagactctc ggcgtggcag cagcagctcc ggggacccgc cactgggaga ccagaagcct 3360ccggccagcc tccgaagttc tccctgtgcc ccctggggcc ccagtggcgc ctggagcagc 3420cggcgctcca gctggagcag cctgggccgt gcccccagcc tcaagcgccg cggccagtgt 3480ggggaacgtg agtccctgct gtctggcgag ggcaagggca gcaccgacga cgaagctgag 3540gacggcaggg ccgcgcccgg gccccgtgcc accccactgc ggcgggccga gtccctggac 3600ccacggcccc tgcggccggc cgccctcccg cctaccaagt gccgcgatcg cgacgggcag 3660gtggtggccc tgcccagcga cttcttcctg cgcatcgaca gccaccgtga ggatgcagcc 3720gagcttgacg acgactcgga ggacagctgc tgcctccgcc tgcataaagt gctggagccc 3780tacaagcccc agtggtgccg gagccgcgag gcctgggccc tctacctctt ctccccacag 3840aaccggttcc gcgtctcctg ccagaaggtc atcacacaca agatgtttga tcacgtggtc 3900ctcgtcttca tcttcctcaa ctgcgtcacc atcgccctgg agaggcctga cattgatccc 3960ggcagcaccg agcgggtctt cctcagcgtc tccaattaca tcttcacggc catcttcgtg 4020gcggagatga tggtgaaggt ggtggccctg gggctgctgt ccggcgagca cgcctacctg 4080cagagcagct ggaacctgct ggatgggctg ctggtgctgg tgtccctggt ggacattgtc 4140gtggccatgg cctcggctgg tggcgccaag atcctgggtg ttctgcgcgt gctgcgtctg 4200ctgcggaccc tgcggcctct gagggtcatc agccgggccc cgggcctcaa gctggtggtg 4260gagacgctga tatcatcact caggcccatt gggaacatcg tcctcatctg ctgcgccttc 4320ttcatcattt ttggcatttt gggtgtgcag ctcttcaaag ggaagttcta ctactgcgag 4380ggccccgaca ccaggaacat ctccaccaag gcacagtgcc gggccgccca ctaccgctgg 4440gtgcgacgca agtacaactt cgacaacctg ggccaggccc tgatgtcgct gttcgtgctg 4500tcatccaagg atggatgggt gaacatcatg tacgacgggc tggatgccgt gggtgtcgac 4560cagcagcctg tgcagaacca caacccctgg atgctgctgt acttcatctc cttcctgctc 4620atcgtcagct tcttcgtgct caacatgttc gtgggcgtcg tggtcgagaa cttccacaag 4680tgccggcagc accaggaggc ggaggaggcg cggcggcgag aggagaagcg gctgcggcgc 4740ctagagagga ggcgcaggag cactttcccc agcccagagg cccagcgccg gccctactat 4800gccgactact cgcccacgcg ccgctccatt cactcgctgt gcaccagcca ctatctcgac 4860ctcttcatca ccttcatcat ctgtgtcaac gtcatcacca tgtccatgga gcactataac 4920caacccaagt cgctggacga ggccctcaag tactgcaact acgtcttcac catcgtgttt 4980gtcttcgagg ctgcactgaa gctggtagca tttgggttcc gtcggttctt caaggacagg 5040tggaaccagc tggacctggc catcgtgctg ctgtcactca tgggcatcac gctggaggag 5100atagagatga gcgccgcgct gcccatcaac cccaccatca tccgcatcat gcgcgtgctt 5160cgcattgccc gtgtgctgaa gctgctgaag atggctacgg gcatgcgcgc cctgctggac 5220actgtggtgc aagctctccc ccaggtgggg aacctgggcc ttcttttcat gctcctgttt 5280tttatctatg ctgcgctggg agtggagctg ttcgggaggc tggagtgcag tgaagacaac 5340ccctgcgagg gcctgagcag gcacgccacc ttcagcaact tcggcatggc cttcctcacg 5400ctgttccgcg tgtccacggg ggacaactgg aacgggatca tgaaggacac gctgcgcgag 5460tgctcccgtg aggacaagca ctgcctgagc tacctgccgg ccctgtcgcc cgtctacttc 5520gtgaccttcg tgctggtggc ccagttcgtg ctggtgaacg tggtggtggc cgtgctcatg 5580aagcacctgg aggagagcaa caaggaggca cgggaggatg cggagctgga cgccgagatc 5640gagctggaga tggcgcaggg ccccgggagt gcacgccggg tggacgcgga caggcctccc 5700ttgccccagg agagtccggg cgccagggat gccccaaacc tggttgcacg caaggtgtcc 5760gtgtccagga tgctctcgct gcccaacgac agctacatgt tcaggcccgt ggtgcctgcc 5820tcggcgcccc acccccgccc gctgcaggag gtggagatgg agacctatgg ggccggcacc 5880cccttgggct ccgttgcctc tgtgcactct ccgcccgcag agtcctgtgc ctccctccag 5940atcccactgg ctgtgtcgtc cccagccagg agcggcgagc ccctccacgc cctgtcccct 6000cggggcacag cccgctcccc cagtctcagc cggctgctct gcagacagga ggctgtgcac 6060accgattcct tggaagggaa gattgacagc cctagggaca ccctggatcc tgcagagcct 6120ggtgagaaaa ccccggtgag gccggtgacc caggggggct ccctgcagtc cccaccacgc 6180tccccacggc ccgccagcgt ccgcactcgt aagcatacct tcggacagcg ctgcgtctcc 6240agccggccgg cggccccagg cggagaggag gccgaggcct cggacccagc cgacgaggag 6300gtcagccaca tcaccagctc cgcctgcccc tggcagccca cagccgagcc ccatggcccc 6360gaagcctctc cggtggccgg cggcgagcgg gacctgcgca ggctctacag cgtggatgct 6420cagggcttcc tggacaagcc gggccgggca gacgagcagt ggcggccctc ggcggagctg 6480ggcagcgggg agcctgggga ggcgaaggcc tggggccctg aggccgagcc cgctctgggt 6540gcgcgcagaa agaagaagat gagccccccc tgcatctcgg tggaaccccc tgcggaggac 6600gagggctctg cgcggccctc cgcggcagag ggcggcagca ccacactgag gcgcaggacc 6660ccgtcctgtg aggccacgcc tcacagggac tccctggagc ccacagaggg ctcaggcgcc 6720gggggggacc ctgcagccaa gggggagcgc tggggccagg cctcctgccg ggctgagcac 6780ctgaccgtcc ccagctttgc ctttgagccg ctggacctcg gggtccccag tggagaccct 6840ttcttggacg gtagccacag tgtgacccca gaatccagag cttcctcttc aggggccata 6900gtgcccctgg aacccccaga atcagagcct cccatgcccg tcggtgaccc cccagagaag 6960aggcgggggc tgtacctcac agtcccccag tgtcctctgg agaaaccagg gtccccctca 7020gccacccctg ccccaggggg tggtgcagat gaccccgtgt ag 706286417DNAHomo Sapiensgene(1)..(6417)T-type calcium channel alpha 1H subunit (CACNA1H), mRNA (Accession NM 000719) 8atggtcaatg agaatacgag gatgtacatt ccagaggaaa accaccaagg ttccaactat 60gggagcccac gccccgccca tgccaacatg aatgccaatg cggcagcggg gctggcccct 120gagcacatcc ccaccccggg ggctgccctg tcgtggcagg cggccatcga cgcagcccgg 180caggctaagc tgatgggcag cgctggcaat gcgaccatct ccacagtcag ctccacgcag 240cggaagcggc agcaatatgg gaaacccaag aagcagggca gcaccacggc cacacgcccg 300ccccgagccc tgctctgcct gaccctgaag aaccccatcc ggagggcctg catcagcatt 360gtcgaatgga aaccatttga aataattatt ttactgacta tttttgccaa ttgtgtggcc 420ttagcgatct atattccctt tccagaagat gattccaacg ccaccaattc caacctggaa 480cgagtggaat atctctttct cataattttt acggtggaag cgtttttaaa agtaatcgcc 540tatggactcc tctttcaccc caatgcctac ctccgcaacg gctggaacct actagatttt 600ataattgtgg ttgtggggct ttttagtgca attttagaac aagcaaccaa agcagatggg 660gcaaacgctc tcggagggaa aggggccgga tttgatgtga aggcgctgag ggccttccgc 720gtgctgcgcc ccctgcggct ggtgtccgga gtcccaagtc tccaggtggt cctgaattcc 780atcatcaagg ccatggtccc cctgctgcac atcgccctgc ttgtgctgtt tgtcatcatc 840atctacgcca tcatcggctt ggagctcttc atggggaaga tgcacaagac ctgctacaac 900caggagggca tagcagatgt tccagcagaa gatgaccctt ccccttgtgc gctggaaacg 960ggccacgggc ggcagtgcca gaacggcacg gtgtgcaagc ccggctggga tggtcccaag 1020cacggcatca ccaactttga caactttgcc ttcgccatgc tcacggtgtt ccagtgcatc 1080accatggagg gctggacgga cgtgctgtac tgggtcaatg atgccgtagg aagggactgg 1140ccctggatct attttgttac actaatcatc atagggtcat tttttgtact taacttggtt 1200ctcggtgtgc ttagcggaga gttttccaaa gagagggaga aggccaaggc ccggggagat 1260ttccagaagc tgcgggagaa gcagcagcta gaagaggatc tcaaaggcta cctggattgg 1320atcactcagg ccgaagacat cgatcctgag aatgaggacg aaggcatgga tgaggagaag 1380ccccgaaaca tgagcatgcc caccagtgag accgagtccg tcaacaccga aaacgtggct 1440ggaggtgaca tcgagggaga aaactgcggg gccaggctgg cccaccggat ctccaagtca 1500aagttcagcc gctactggcg ccggtggaat cggttctgca gaaggaagtg ccgcgccgca 1560gtcaagtcta atgtcttcta ctggctggtg attttcctgg tgttcctcaa cacgctcacc 1620attgcctctg agcactacaa ccagcccaac tggctcacag aagtccaaga cacggcaaac 1680aaggccctgc tggccctgtt cacggcagag atgctcctga agatgtacag cctgggcctg 1740caggcctact tcgtgtccct cttcaaccgc tttgactgct tcgtcgtgtg tggcggcatc 1800ctggagacca tcctggtgga gaccaagatc atgtccccac tgggcatctc cgtgctcaga 1860tgcgtccggc tgctgaggat tttcaagatc acgaggtact ggaactcctt gagcaacctg 1920gtggcatcct tgctgaactc tgtgcgctcc atcgcctccc tgctccttct cctcttcctc 1980ttcatcatca tcttctccct cctggggatg cagctctttg gaggaaagtt caactttgat 2040gagatgcaga cccggaggag cacattcgat aacttccccc agtccctcct cactgtgttt 2100cagatcctga ccggggagga ctggaattcg gtgatgtatg atgggatcat ggcttatggc 2160ggcccctctt ttccagggat gttagtctgt atttacttca tcatcctctt catctgtgga 2220aactatatcc tactgaatgt gttcttggcc attgctgtgg acaacctggc tgatgctgag 2280agcctcacat ctgcccaaaa ggaggaggaa gaggagaagg agagaaagaa gctggccagg 2340actgccagcc cagagaagaa acaagagttg gtggagaagc cggcagtggg ggaatccaag 2400gaggagaaga ttgagctgaa atccatcacg gctgacggag agtctccacc cgccaccaag 2460atcaacatgg atgacctcca gcccaatgaa aatgaggata agagccccta ccccaaccca 2520gaaactacag gagaagagga tgaggaggag ccagagatgc ctgtcggccc tcgcccacga 2580ccactctctg agcttcacct taaggaaaag gcagtgccca tgccagaagc cagcgcgttt 2640ttcatcttca gctctaacaa caggtttcgc ctccagtgcc accgcattgt caatgacacg 2700atcttcacca acctgatcct cttcttcatt ctgctcagca gcatttccct ggctgctgag 2760gacccggtcc agcacacctc cttcaggaac catattctgt tttattttga tattgttttt 2820accaccattt tcaccattga aattgctctg aagatgactg cttatggggc tttcttgcac 2880aagggttctt tctgccggaa ctacttcaac atcctggacc tgctggtggt cagcgtgtcc 2940ctcatctcct ttggcatcca gtccagtgca atcaatgtcg tgaagatctt gcgagtcctg 3000cgagtactca ggcccctgag ggccatcaac agggccaagg ggctaaagca tgtggttcag 3060tgtgtgtttg tcgccatccg gaccatcggg aacatcgtga ttgtcaccac cctgctgcag 3120ttcatgtttg cctgcatcgg ggtccagctc ttcaagggaa agctgtacac ctgttcagac 3180agttccaagc agacagaggc ggaatgcaag ggcaactaca tcacgtacaa agacggggag 3240gttgaccacc ccatcatcca accccgcagc tgggagaaca gcaagtttga ctttgacaat 3300gttctggcag ccatgatggc cctcttcacc gtctccacct tcgaagggtg gccagagctg 3360ctgtaccgct ccatcgactc ccacacggaa gacaagggcc ccatctacaa ctaccgtgtg 3420gagatctcca tcttcttcat catctacatc atcatcatcg ccttcttcat gatgaacatc 3480ttcgtgggct tcgtcatcgt cacctttcag gagcaggggg agcaggagta caagaactgt 3540gagctggaca agaaccagcg acagtgcgtg gaatacgccc tcaaggcccg gcccctgcgg 3600aggtacatcc ccaagaacca gcaccagtac aaagtgtggt acgtggtcaa ctccacctac 3660ttcgagtacc tgatgttcgt cctcatcctg ctcaacacca tctgcctggc catgcagcac 3720tacggccaga gctgcctgtt caaaatcgcc atgaacatcc tcaacatgct cttcactggc 3780ctcttcaccg tggagatgat cctgaagctc attgccttca aacccaagca ctatttctgt 3840gatgcatgga atacatttga cgccttgatt gttgtgggta gcattgttga tatagcaatc 3900accgaggtaa acccagctga acatacccaa tgctctccct ctatgaacgc agaggaaaac 3960tcccgcatct ccatcacctt cttccgcctg ttccgggtca tgcgtctggt gaagctgctg 4020agccgtgggg agggcatccg gacgctgctg tggaccttca tcaagtcctt ccaggccctg 4080ccctatgtgg ccctcctgat cgtgatgctg ttcttcatct acgcggtgat cgggatgcag 4140gtgtttggga aaattgccct gaatgatacc acagagatca accggaacaa caactttcag 4200accttccccc aggccgtgct gctcctcttc aggtgtgcca ccggggaggc ctggcaggac 4260atcatgctgg cctgcatgcc aggcaagaag tgtgccccag agtccgagcc cagcaacagc 4320acggagggtg aaacaccctg tggtagcagc tttgctgtct tctacttcat cagcttctac 4380atgctctgtg ccttcctgat catcaacctc tttgtagctg tcatcatgga caactttgac 4440tacctgacaa gggactggtc catccttggt ccccaccacc tggatgagtt taaaagaatc 4500tgggcagagt atgaccctga agccaagggt cgtatcaaac acctggatgt ggtgaccctc 4560ctccggcgga ttcagccgcc actaggtttt gggaagctgt gccctcaccg cgtggcttgc 4620aaacgcctgg tctccatgaa catgcctctg aacagcgacg ggacagtcat gttcaatgcc 4680accctgtttg ccctggtcag gacggccctg aggatcaaaa cagaagggaa cctagaacaa 4740gccaatgagg agctgcgggc gatcatcaag aagatctgga agcggaccag catgaagctg 4800ctggaccagg tggtgccccc tgcaggtgat gatgaggtca ccgttggcaa gttctacgcc 4860acgttcctga tccaggagta cttccggaag ttcaagaagc gcaaagagca gggccttgtg 4920ggcaagccct cccagaggaa cgcgctgtct ctgcaggctg gcttgcgcac actgcatgac 4980atcgggcctg agatccgacg ggccatctct ggagatctca ccgctgagga ggagctggac 5040aaggccatga aggaggctgt gtccgctgct tctgaagatg acatcttcag gagggccggt 5100ggcctgttcg gcaaccacgt cagctactac caaagcgacg gccggagcgc cttcccccag 5160accttcacca ctcagcgccc gctgcacatc aacaaggcgg gcagcagcca gggcgacact 5220gagtcgccat cccacgagaa gctggtggac tccaccttca ccccgagcag ctactcgtcc 5280accggctcca acgccaacat caacaacgcc aacaacaccg ccctgggtcg cctccctcgc 5340cccgccggct accccagcac agtcagcact gtggagggcc acgggccccc cttgtcccct 5400gccatccggg tgcaggaggt ggcgtggaag ctcagctcca acaggtgcca ctcccgggag 5460agccaggcag ccatggcggg tcaggaggag acgtctcagg atgagaccta tgaagtgaag 5520atgaaccatg acacggaggc ctgcagtgag cccagcctgc tctccacaga gatgctctcc 5580taccaggatg acgaaaatcg gcaactgacg ctcccagagg aggacaagag ggacatccgg 5640caatctccga agaggggttt cctccgctct gcctcactag gtcgaagggc ctccttccac 5700ctggaatgtc tgaagcgaca gaaggaccga gggggagaca tctctcagaa gacagtcctg 5760cccttgcatc tggttcatca tcaggcattg gcagtggcag gcctgagccc cctcctccag 5820agaagccatt cccctgcctc attccctagg ccttttgcca ccccaccagc cacacctggc 5880agccgaggct ggcccccaca gcccgtcccc accctgcggc ttgagggggt cgagtccagt 5940gagaaactca acagcagctt cccatccatc cactgcggct cctgggctga gaccaccccc 6000ggtggcgggg gcagcagcgc cgcccggaga gtccggcccg tctccctcat ggtgcccagc 6060caggctgggg ccccagggag gcagttccac ggcagtgcca gcagcctggt ggaagcggtc 6120ttgatttcag aaggactggg gcagtttgct caagatccca agttcatcga ggtcaccacc 6180caggagctgg ccgacgcctg cgacatgacc atagaggaga tggagagcgc ggccgacaac 6240atcctcagcg ggggcgcccc acagagcccc aatggcgccc tcttaccctt tgtgaactgc 6300agggacgcgg ggcaggaccg agccgggggc gaagaggacg cgggctgtgt gcgcgcgcgg 6360ggtcgaccga gtgaggagga gctccaggac agcagggtct acgtcagcag cctgtag 64179215DNARabbitgene(1)..(215)K+/pacemaker channel beta subunit mirp1 (mink-related peptide, HCN channel subunit, KCNE2) mRNA (partial coding sequence) 9atgcggagaa cttctactat gtcatcctct acctcatggt gatgattggc atgttctcct 60tcatcatcgt ggccatcctg gtgagcacgg tgaagtccaa gaggcgggaa cactccaacg 120acccctacca ccagtacatc gtggaggact ggcaggaaaa gtacaaaagc cagattttgc 180atttcgaaga agccaaggcc accatccatg agaac 21510372DNAHomo Sapiensgene(1)..(372)potassium voltage-gated channel, Isk-related family, member 2 (KCNE2), mRNA. Complete on 3' end (3 prime). (Assession NM 172201) 10atgtctactt tatccaattt cacacagacg ctggaagacg tcttccgaag gatttttatt 60acttatatgg acaattggcg ccagaacaca acagctgagc aagaggccct ccaagccaaa 120gttgatgctg agaacttcta ctatgtcatc ctgtacctca tggtgatgat tggaatgttc 180tctttcatca tcgtggccat cctggtgagc actgtgaaat ccaagagacg ggaacactcc 240aatgacccct accaccagta cattgtagag gactggcagg aaaagtacaa gagccaaatc 300ttgaatctag aagaatcgaa ggccaccatc catgagaaca ttggtgcggc tgggttcaaa 360atgtccccct ga 372111401DNAHomo Sapiensgene(1)..(1401)cholinergic receptor, muscarinic 2 (CHRM2), mRNA. (Accession NM 000739) 11atgaataact caacaaactc ctctaacaat agcctggctc ttacaagtcc ttataagaca 60tttgaagtgg tgtttattgt cctggtggct ggatccctca gtttggtgac cattatcggg 120aacatcctag tcatggtttc cattaaagtc aaccgccacc tccagaccgt caacaattac 180tttttattca gcttggcctg tgctgacctt atcataggtg ttttctccat gaacttgtac 240accctctaca ctgtgattgg ttactggcct ttgggacctg tggtgtgtga cctttggcta 300gccctggact atgtggtcag caatgcctca gttatgaatc tgctcatcat cagctttgac 360aggtacttct gtgtcacaaa acctctgacc tacccagtca agcggaccac aaaaatggca 420ggtatgatga ttgcagctgc ctgggtcctc tctttcatcc tctgggctcc agccattctc 480ttctggcagt tcattgtagg ggtgagaact gtggaggatg

gggagtgcta cattcagttt 540ttttccaatg ctgctgtcac ctttggtacg gctattgcag ccttctattt gccagtgatc 600atcatgactg tgctatattg gcacatatcc cgagccagca agagcaggat aaagaaggac 660aagaaggagc ctgttgccaa ccaagacccc gtttctccaa gtctggtaca aggaaggata 720gtgaagccaa acaataacaa catgcccagc agtgacgatg gcctggagca caacaaaatc 780cagaatggca aagcccccag ggatcctgtg actgaaaact gtgttcaggg agaggagaag 840gagagctcca atgactccac ctcagtcagt gctgttgcct ctaatatgag agatgatgaa 900ataacccagg atgaaaacac agtttccact tccctgggcc attccaaaga tgagaactct 960aagcaaacat gcatcagaat tggcaccaag accccaaaaa gtgactcatg taccccaact 1020aataccaccg tggaggtagt ggggtcttca ggtcagaatg gagatgaaaa gcagaatatt 1080gtagcccgca agattgtgaa gatgactaag cagcctgcaa aaaagaagcc tcctccttcc 1140cgggaaaaga aagtcaccag gacaatcttg gctattctgt tggctttcat catcacttgg 1200gccccataca atgtcatggt gctcattaac accttttgtg caccttgcat ccccaacact 1260gtgtggacaa ttggttactg gctttgttac atcaacagca ctatcaaccc tgcctgctat 1320gcactttgca atgccacctt caagaagacc tttaaacacc ttctcatgtg tcattataag 1380aacataggcg ctacaaggta a 1401121773DNAHomo Sapiensgene(1)..(1773)cholinergic receptor, muscarinic 3 (CHRM3), mRNA. (Accession NM 000740) 12atgaccttgc acaataacag tacaacctcg cctttgtttc caaacatcag ctcctcctgg 60atacacagcc cctccgatgc agggctgccc ccgggaaccg tcactcattt cggcagctac 120aatgtttctc gagcagctgg caatttctcc tctccagacg gtaccaccga tgaccctctg 180ggaggtcata ccgtctggca agtggtcttc atcgctttct taacgggcat cctggccttg 240gtgaccatca tcggcaacat cctggtaatt gtgtcattta aggtcaacaa gcagctgaag 300acggtcaaca actacttcct cttaagcctg gcctgtgccg atctgattat cggggtcatt 360tcaatgaatc tgtttacgac ctacatcatc atgaatcgat gggccttagg gaacttggcc 420tgtgacctct ggcttgccat tgactacgta gccagcaatg cctctgttat gaatcttctg 480gtcatcagct ttgacagata cttttccatc acgaggccgc tcacgtaccg agccaaacga 540acaacaaaga gagccggtgt gatgatcggt ctggcttggg tcatctcctt tgtcctttgg 600gctcctgcca tcttgttctg gcaatacttt gttggaaaga gaactgtgcc tccgggagag 660tgcttcattc agttcctcag tgagcccacc attacttttg gcacagccat cgctgctttt 720tatatgcctg tcaccattat gactatttta tactggagga tctataagga aactgaaaag 780cgtaccaaag agcttgctgg cctgcaagcc tctgggacag aggcagagac agaaaacttt 840gtccacccca cgggcagttc tcgaagctgc agcagttacg aacttcaaca gcaaagcatg 900aaacgctcca acaggaggaa gtatggccgc tgccacttct ggttcacaac caagagctgg 960aaacccagct ccgagcagat ggaccaagac cacagcagca gtgacagttg gaacaacaat 1020gatgctgctg cctccctgga gaactccgcc tcctccgacg aggaggacat tggctccgag 1080acgagagcca tctactccat cgtgctcaag cttccgggtc acagcaccat cctcaactcc 1140accaagttac cctcatcgga caacctgcag gtgcctgagg aggagctggg gatggtggac 1200ttggagagga aagccgacaa gctgcaggcc cagaagagcg tggacgatgg aggcagtttt 1260ccaaaaagct tctccaagct tcccatccag ctagagtcag ccgtggacac agctaagact 1320tctgacgtca actcctcagt gggtaagagc acggccactc tacctctgtc cttcaaggaa 1380gccactctgg ccaagaggtt tgctctgaag accagaagtc agatcactaa gcggaaaagg 1440atgtccctgg tcaaggagaa gaaagcggcc cagaccctca gtgcgatctt gcttgccttc 1500atcatcactt ggaccccata caacatcatg gttctggtga acaccttttg tgacagctgc 1560atacccaaaa ccttttggaa tctgggctac tggctgtgct acatcaacag caccgtgaac 1620cccgtgtgct atgctctgtg caacaaaaca ttcagaacca ctttcaagat gctgctgctg 1680tgccagtgtg acaaaaaaaa gaggcgcaag cagcagtacc agcagagaca gtcggtcatt 1740tttcacaagc gcgcacccga gcaggccttg tag 1773131284DNAHomo Sapiensgene(1)..(1284)potassium inwardly-rectifying channel, subfamily J, member 2 (KCNJ2) (Accession NM 000891) 13atgggcagtg tgcgaaccaa ccgctacagc atcgtctctt cagaagaaga cggtatgaag 60ttggccacca tggcagttgc aaatggcttt gggaacggga agagtaaagt ccacacccga 120caacagtgca ggagccgctt tgtgaagaaa gatggccact gtaatgttca gttcatcaat 180gtgggtgaga aggggcaacg gtacctcgca gacatcttca ccacgtgtgt ggacattcgc 240tggcggtgga tgctggttat cttctgcctg gctttcgtcc tgtcatggct gttttttggc 300tgtgtgtttt ggttgatagc tctgctccat ggggacctgg atgcatccaa agagggcaaa 360gcttgtgtgt ccgaggtcaa cagcttcacg gctgccttcc tcttctccat tgagacccag 420acaaccatag gctatggttt cagatgtgtc acggatgaat gcccaattgc tgttttcatg 480gtggtgttcc agtcaatcgt gggctgcatc atcgatgctt tcatcattgg cgcagtcatg 540gccaagatgg caaagccaaa gaagagaaac gagactcttg tcttcagtca caatgccgtg 600attgccatga gagacggcaa gctgtgtttg atgtggcgag tgggcaatct tcggaaaagc 660cacttggtgg aagctcatgt tcgagcacag ctcctcaaat ccagaattac ttctgaaggg 720gagtatatcc ctctggatca aatagacatc aatgttgggt ttgacagtgg aatcgatcgt 780atatttctgg tgtccccaat cactatagtc catgaaatag atgaagacag tcctttatat 840gatttgagta aacaggacat tgacaacgca gactttgaaa tcgtggtcat actggaaggc 900atggtggaag ccactgccat gacgacacag tgccgtagct cttatctagc aaatgaaatc 960ctgtggggcc accgctatga gcctgtgctc tttgaagaga agcactacta caaagtggac 1020tattccaggt tccacaaaac ttacgaagtc cccaacactc ccctttgtag tgccagagac 1080ttagcagaaa agaaatatat cctctcaaat gcaaattcat tttgctatga aaatgaagtt 1140gccctcacaa gcaaagagga agacgacagt gaaaatggag ttccagaaag cactagtacg 1200gacacgcccc ctgacataga ccttcacaac caggcaagtg tacctctaga gcccaggccc 1260ttacggcgag agtcggagat atga 1284141968DNAHomo Sapiensgene(1)..(1968)potassium voltage-gated channel, Shal-related subfamily, member 3 (KCND3), transcript variant 1. (Accession NM 004980) 14atggcggccg gagttgcggc ctggctgcct tttgcccggg ctgcggccat cgggtggatg 60ccggtggcca actgccccat gcccctggcc ccggccgaca agaacaagcg gcaggatgag 120ctgattgtcc tcaacgtgag tgggcggagg ttccagacct ggaggaccac gctggagcgc 180tacccggaca ccctgctggg cagcacggag aaggagttct tcttcaacga ggacaccaag 240gagtacttct tcgaccggga ccccgaggtg ttccgctgcg tgctcaactt ctaccgcacg 300gggaagctgc actacccgcg ctacgagtgc atctctgcct acgacgacga gctggccttc 360tacggcatcc tcccggagat catcggggac tgctgctacg aggagtacaa ggaccgcaag 420agggagaacg ccgagcggct catggacgac aacgactcgg agaacaacca ggagtccatg 480ccctcgctca gcttccgcca gaccatgtgg cgggccttcg agaaccccca caccagcacg 540ctggccctgg tcttctacta cgtgactggc ttcttcatcg ctgtctcggt catcaccaac 600gtggtggaga cggtgccgtg cggcacggtc ccgggcagca aggagctgcc gtgcggggag 660cgctactcgg tggccttctt ctgcctggac acggcgtgcg tcatgatctt caccgtggag 720tacctcctgc ggctcttcgc ggctcccagc cgctaccgct tcatccgcag cgtcatgagc 780atcatcgacg tggtggccat catgccctac tacatcggtc tggtcatgac caacaacgag 840gacgtgtccg gcgccttcgt cacgctccgg gtcttccgcg tcttcaggat cttcaagttt 900tcccgccact cccagggcct gcggatcctg ggctacacac tgaagagctg tgcctccgaa 960ctgggctttc ttctcttctc cctcaccatg gccatcatca tctttgccac tgtgatgttt 1020tatgccgaga agggctcctc ggccagcaag ttcacaagca tccctgcctc gttttggtac 1080accattgtca ccatgaccac actggggtac ggagacatgg tgcctaagac gattgcaggg 1140aagatcttcg gctccatctg ctccttgagt ggcgtcctgg tcattgccct gccagtccct 1200gtgattgttt ccaactttag ccggatttac caccagaatc agagagctga taaacgcagg 1260gcacaaaaga aggcccgcct tgccaggatc cgtgtggcca aaacaggcag ttcgaatgca 1320tacctgcaca gcaagcgcaa cgggctcctc aacgaggcgc tggagctgac gggcacccca 1380gaagaggagc acatgggcaa gaccacctca ctcatcgaga gccagcatca tcacctgctg 1440cactgcctgg aaaaaaccac tgggttgtcc tatcttgtgg atgatcccct gttatctgta 1500cgaacctcca ccatcaagaa ccacgagttt attgatgagc agatgtttga gcagaactgc 1560atggagagtt caatgcagaa ctacccatcc acaagaagtc cctcactgtc cagccaccca 1620ggcctcacta ccacctgctg ctcccgtcgt agtaagaaga ccacacacct gcccaattct 1680aacctgccag ctactcgcct gcgcagcatg caagagctca gcacgatcca catccagggc 1740agtgagcagc cctccctcac aaccagtcgc tccagcctta atttgaaagc agacgacgga 1800ctgagaccaa actgcaaaac atcccagatc accacagcca tcatcagcat ccccactccc 1860ccagcgctaa ccccagaggg ggaaagtcgg ccaccccctg ccagcccagg ccccaacacg 1920aacattcctt ccatagccag caatgttgtc aaggtctccg ccttgtaa 196815759DNAHomo Sapiensgene(1)..(759)Kv channel interacting protein 2. (Accession BC034685) 15atgcggggcc agggccgcaa ggagagtttg tccgattccc gagacctgga cggctcctac 60gaccagctca cgggccaccc tccagggccc actaaaaaag cgctgaagca gcgattcctc 120aagctgctgc cgtgctgcgg gccccaagcc ctgccctcag tcagtgaaaa cagcgtggac 180gatgaatttg aattgtccac cgtgtgtcac cggcctgagg gtctggagca gctgcaggag 240caaaccaaat tcacgcgcaa ggagttgcag gtcctgtacc ggggcttcaa gaacgaatgt 300cccagcggaa ttgtcaatga ggagaacttc aagcagattt actcccagtt ctttcctcaa 360ggagactcca gcacctatgc cacttttctc ttcaatgcct ttgacaccaa ccatgatggc 420tcggtcagtt ttgaggactt tgtggctggt ttgtccgtga ttcttcgggg aactgtagat 480gacaggctta attgggcctt caacctgtat gaccttaaca aggacggctg catcaccaag 540gaggaaatgc ttgacatcat gaagtccatc tatgacatga tgggcaagta cacgtaccct 600gcactccggg aggaggcccc aagggaacac gtggagagct tcttccagaa gatggacaga 660aacaaggatg gtgtggtgac cattgaggaa ttcattgagt cttgtcaaaa ggatgagaac 720atcatgaggt ccatgcagct ctttgacaat gtcatctag 759162733DNARattus norvegicusgene(1)..(2733)hyperpolarization-activated, cyclic nucleotide-gated potassium channel 1 HCN1. (Accession NM 053375) 16atggaaggcg gcggcaagcc caactccgct tccaacagcc gcgacgatgg caacagcgtc 60tacccctcca aggcgcccgc gacggggccg gcggcggccg acaagcgcct ggggaccccg 120ccggggggcg gcgcggccgg gaaggaacac ggcaactccg tgtgcttcaa ggtggacggc 180ggcggaggag aggagccggc gggcagcttc gaggatgccg aggggccccg gcgacagtac 240ggtttcatgc agaggcagtt cacctccatg ctgcagcctg gggtcaacaa attctccctc 300cgcatgttcg ggagccagaa ggcggtggag aaggagcagg aaagggttaa aactgcaggc 360ttctggatta tccatccgta cagtgacttc aggttttatt gggatttaat aatgcttata 420atgatggttg gaaatttggt catcatacca gttggaatca cattcttcac agagcaaaca 480acaacaccgt ggattatttt caatgtggca tcagatacag ttttcctgtt ggacctaatc 540atgaatttta ggactgggac tgtcaacgaa gacagctctg aaatcatcct ggaccctaaa 600gtaatcaaga tgaattattt aaaaagctgg ttcgtggtgg acttcatctc ctcgatcccg 660gtggattata tctttcttat tgtagagaaa ggaatggatt cggaagttta caagaccgcc 720agagcacttc ggatcgtgag gtttacaaaa attctcagtc tcttgcgttt attacgcctt 780tcaaggttaa ttagatacat acaccagtgg gaagagatat tccacatgac atatgatctc 840gccagtgcag tggtgagaat cttcaacctc attggcatga tgctgctcct gtgtcactgg 900gatggctgtc ttcagtttct ggtccccctg ctgcaggact tcccaccgga ttgctgggtt 960tctctaaatg aaatggttaa tgattcatgg gggaaacagt attcctacgc actcttcaaa 1020gctatgagtc acatgctgtg cattggttat ggcgcccagg cccccgtcag catgtctgac 1080ctctggatta ccatgctgag catgattgtt ggggccacct gctatgccat gtttgtcggc 1140catgccacag ctttgatcca gtctctggat tcttcaagga ggcagtatca agagaagtac 1200aagcaagtag agcaatacat gtcattccac aagttaccag ctgacatgcg ccagaagata 1260catgattact atgagcaccg ataccaaggc aagatcttcg atgaggaaaa tattctcagt 1320gaacttaatg atcctctgag agaggaaata gtcaacttca actgccggaa actggtggcc 1380accatgcctc tctttgctaa cgcggatccc aatttcgtga cggccatgct gagcaagctg 1440agatttgagg tgttccagcc cggagactat atcattcgag aaggagctgt ggggaagaaa 1500atgtatttca tccagcatgg tgtggctggt gtcatcacca agtccagtaa agaaatgaag 1560ttgacagacg gctcttactt tggagaaata tgcctgctga ccaagggccg gcgcactgcc 1620agtgttcgag ctgatacata ctgtcgcctt tactcccttt cggtggacaa tttcaacgag 1680gtcttggagg aatatccaat gatgagaaga gcctttgaga cagttgctat tgaccgacta 1740gatcggatag gcaagaaaaa ctctattctc ctgcagaagt tccagaagga tctgaacact 1800ggtgttttca acaaccagga gaatgagatc ctgaagcaga ttgtgaagca tgacagagag 1860atggtacaag cgatccctcc aatcaactat cctcaaatga cagccctgaa ttgcacatct 1920tcaaccacca ccccaacgtc gcgcatgagg acccaatctc caccagtcta cacagcgacc 1980agcctctctc acagcaacct gcactcaccc agccccagca cacagacgcc tcaaccctca 2040gccatccttt caccctgctc ctacaccaca gcagtctgca gtcctcctat acagagcccc 2100ctggccacgc gaactttcca ttatgcctct cccactgcat cccaattgtc actcatgcag 2160cagcctcagc cgcagctaca gcaatcccag gtacagcaga ctcagactca gactcagcag 2220cagcagcagc aacagcagcc gcagccgcag ccgcagcagc cgcaacagca acaacagcag 2280caacagcagc agcagcagca gcagcaacaa cagcagcagc aacagccaca gacacctggt 2340agttccacac cgaaaaatga agtgcacaag agcactcaag ctcttcataa cacccacctg 2400accagagaag tcaggcccct ctctgcctcg cagccttcgc tgccccatga ggtctccact 2460atgatctcca gaccgcatcc cactgtgggc gagtccctgg cttccatccc tcaacccgtg 2520gcaacagtcc acagcactgg ccttcaggca gggagcagga gcaccgtgcc acagcgtgtc 2580accttgttca gacagatgtc ctcgggagcc attcccccca accgaggagt gcctccagca 2640cccccgccac cagcagctgt gcagagagag tctccctcag tcttaaataa agacccagat 2700gcagaaaaac cccgttttgc ttcgaattta tga 2733172871DNARattus norvegicusgene(1)..(2871)hyperpolarization activated cyclic nucleotide-gated potassium channel 2 (Norway Rat) HCN2 (Accession XM 343170) 17atggcagccc tgagccagtc acttactgaa tatcgagaaa aaataaaaaa cccactgaag 60cagggtgaac atgaaagatc ccccttcatc tggaacaggc atgtgccctg gggtgggaca 120caatctggca ctgtcaactg taatgttcaa aagtggaaac cagaggggtg ccaggggcag 180ctccggagtc cccagggtca gggcagccca tctgtgtcag atgaggacat gcagctggca 240aggcacatcc aacaccatgg aacacctact ggtgggggtg gctcaggtgg aggcggggct 300cccgcnnnnn nnnnnnnnnn nnnnnnnnnn nnnnnnnnnn nnnnnnnnnn nnnnncgccg 360ccgcccgcgc cccctcagcc tcagccacca cccgcgccac ccccgaaccc cacgaccccc 420tcgcacccgg agtcggcgga cgagcccggc ccgcgctccc ggctctgcag ccgcgacagc 480tcctgcactc ctggcgcggc caagggcggc gcgaatggcg agtgcgggcg cggggagccg 540cagtgcagcc ccgagggccc cgcgcgcggc cccaaggttt cgttctcatg tcgcggggcg 600gcctcggggc ccgcggcggc cgaggaggcg ggcagcgagg aggcgggccc ggcgggtgag 660ccgcgcggca gccaggccag cttcctgcag cgccaattcg gggcgctcct gcagccgggc 720gtcaacaagt tctccctgcg gatgtttggc agccagaagg ccgtggagcg cgagcaggaa 780cgcgtgaagt cggcgggggc ctggatcatc cacccctaca gcgacttcag gttctactgg 840gacttcacca tgctgttgtt catggtggga aatctcatca tcatccctgt gggcatcact 900ttcttcaagg acgagaccac ggcgccctgg atcgtcttca acgtggtctc ggacactttc 960ttcctcatgg acttggtgct gaactttcgc accggcattg ttattgagga caacacggag 1020atcatcctgg accccgaaaa gataaagaaa aagtacctgc gtacgtggtt cgtggtagac 1080ttcgtgtcat ccatcccggt ggactacatc ttcctcatcg tggagaaggg aatcgactcc 1140gaggtctaca agacggcccg tgcactacgc atcgtgcgtt tcaccaagat cctcagtctg 1200ctgcggttgc tgcggctatc ccggctcatc cgatatatcc accaatggga ggagattttc 1260cacatgacct acgacctggc aagcgcggtg atgcgcatct gtaacctgat cagcatgatg 1320ctgctgctct gccactggga cggctgcctg cagttcctgg tgcccatgct gcaagacttc 1380cccagcgact gctgggtgtc catcaacaac atggtgaacc actcgtggag cgaactctat 1440tcgttcgcgc tcttcaaggc catgagccac atgctctgta ttggctacgg gcggcaggct 1500cccgagagca tgacggacat ctggctcacc atgctcagca tgatcgtggg cgccacctgc 1560tacgctatgt tcattgggca cgccacggcg cttatccagt ccctggactc gtcacggcgc 1620cagtaccagg agaagtacaa gcaagtggag cagtacatgt ccttccacaa actgccggct 1680gacttccgcc agaagatcca cgattactat gaacaccggt accaggggaa gatgtttgac 1740gaggacagca tcctggggga actcaacggc ccactgcgtg aggagattgt gaacttcaac 1800tgccggaagc tggtggcttc catgccgttg tttgccaacg cagaccccaa cttcgtcacc 1860gccatgctga caaagctcaa atttgaggtc ttccagcctg gagactacat catccgagag 1920gggaccatcg ggaagaagat gtacttcatc cagcacgggg tggtgagcgt gctcaccaag 1980ggcaacaagg agatgaagct gtcagatggc tcctattttg gggagatctg cctgctcacg 2040aggggccggc gcacagccag tgtgcgggct gacacctact gtcgcctcta ctcactgagc 2100gtggacaact tcaacgaggt gctggaggag taccccatga tgcggcgtgc ctttgagacc 2160gtggccattg accgcctgga ccgcataggc aagaagaact ccatcttgct acacaaggtt 2220cagcatgatc tcagctcggg tgtgttcaac aaccaggaga acgccatcat ccaggagatt 2280gtcaaatatg accgtgagat ggtgcagcag gcagagctgg gccagcgtgt ggggctcttc 2340ccaccaccgc caccaccgca ggtcacgtcg gccatcgcca cgctgcagca ggccgtggcc 2400atgagcttct gcccgcaggt ggcccgcccg ctcgtggggc ccctggcgct agggtcccca 2460cgcctcgtgc gccgcgcgcc cccagggcct ctgcctcctg cagcctcacc agggccaccc 2520gcagcgagcc ccccggctgc accctcgagc cctcgggcac cgcggacctc accctacggt 2580gtgcctggct ctccggcaac gcgtgtgggg cccgcattgc ccgcacgccg cctgagccgc 2640gcctcgcgcc cactgtccgc ctcgcagccc tcgctgcccc acggcgcgcc cgcacccagc 2700cccgcggcct ctgcgcgccc ggccagcagc tccaccccgc gtctgggacc cgcacccacc 2760acccggaccg cggcacccag tccggaccgc agggactcag cctcgccggg cgctgccagt 2820ggcctcgacc cactggactc tgcgcgctcg cgcctctctt ccaacttgtg a 2871182343DNARattus norvegicusgene(1)..(2343)hyperpolarization-activated, cyclic nucleotide-gated potassium channel 3 (Norway Rat) HCN3 (Accession NM 053685) 18atggaggagg aggcgcggcc ggcggtgggg gacggggaag cggcgactcc tgcacgcgag 60acgcctcctg cggctcccgc ccaggcccgc gcggcctcag gtggggtgcc agagtctgcg 120cccgagccga agaggcggca gctcgggacg ctgctgcagc cgaccgtcaa caagttctct 180ctccgggtct tcggcagcca caaagcggtg gaaatcgagc aggagagggt gaagtccgcc 240ggggcctgga tcatccaccc ctacagcgac ttccggtttt actgggacct gatcatgctg 300ctgctgatgg tggggaacct catagtactg cccgtgggca tcactttctt caaggaggag 360aactccccac cctggatcgt cttcaatgtc ctctcggaca ctttcttcct gctggatctg 420gtgctcaact tccgaactgg catcgtggtg gaggaaggtg cggagatcct gttggcgccc 480agggctatcc gcacgcgtta cctgcgcacc tggttcctgg tggacctgat ttcctccatc 540cctgtggatt acatcttcct agtggtagag ctggagccac gactagacgc tgaggtctac 600aaaacggcac gggccctgcg catcgttaga ttcaccaaga tccttagcct gctgcggctg 660ctccgcctct cccgcctcat ccgatacatg caccagtggg aggagatctt tcacatgacc 720tacgacctgg ccagtgcagt ggttcgcatc ttcaacctca ttggaatgat gttgctgctg 780tgtcactggg atggctgtct gcagttcctg gtccctatgc tgcaggactt cccttccgac 840tgctgggtct ccatgaaccg catggtgaac cactcgtggg gccgccagta ctcccacgcc 900ctgttcaagg ccatgagtca catgctgtgc attggctacg ggcagcaggc accagtaggc 960atgcctgacg tctggctcac catgctcagc atgattgtgg gcgccacctg ctatgccatg 1020ttcatcggcc acgccaccgc cctcatccag tccctggact cgtcccggcg ccagtaccag 1080gagaagtaca agcaggtgga gcagtacatg tccttccaca agctgccagc cgacacacgg 1140cagcgcatcc acgagtacta cgagcatcgg taccagggca agatgttcga tgaagagagc 1200atcctggggg agctgagcga gccgcttcgg gaggagatta ttaacttcac ctgccggggc 1260ctggtggccc acatgccgct gtttgctcat gctgacccca gtttcgtcac cgcagtactc 1320accaagctcc gttttgaggt cttccaacct ggggatctgg tggtgcgtga gggctccgtg 1380ggcaggaaga tgtacttcat ccagcatggg ctgctcagtg tgttggcacg gggcgcccgg 1440gacactcgcc tcactgacgg atcctacttt ggggagatct gcctgctgac tcgaggtcgg 1500agaacagcca gtgtaagggc tgacacctac tgtcgcctct actcactcag cgtggaccac 1560ttcaatgcag tgcttgagga gttcccgatg atgcgcaggg cttttgagac tgtggccatg 1620gaccggcttc ggcgcatcgg caaaaagaat tcgatattgc agcggaaacg ctctgagccg 1680agtccaggca gcagcagtgg tggcgtcatg gagcagcatt tggtacaaca

cgacagagac 1740atggctcgtg gtattcgggg tctggctccg ggcacaggag ctcgcctcag tggaaagcca 1800gtgctgtggg aaccactggt acacgcacct ctgcaggcag ctgctgtgac ctccaacgtg 1860gccatagcct tgactcatca gcgaggccct ctgcccctct cccctgattc tccagccacc 1920ctcctggctc gatctgctag acgctcagca ggctccccag cctccccact ggtgcctgtc 1980cgagcaggtc ctctgctggc ccggggaccc tgggcgtcca cttctcgcct gcctgctcca 2040cctgcccgaa ccctccatgc cagcctatcc cggacagggc gttcccaggt gtctctgttg 2100ggccctcccc caggaggagg tggtcggagg ctaggacctc ggggccgccc actctctgcc 2160tctcaaccct ctctgcctca gcgagccacg ggggatggct ctcctaggcg caaaggctct 2220ggaagtgagc gtctgccccc ctcggggctc ctggccaagc ctccagggac tgtccagcca 2280tccaggtcat cagtgcctga gccagttacc cccagaggtc cccaaatttc tgccaacatg 2340tga 2343193597DNARattus norvegicusgene(1)..(3597)hyperpolarization-activated, cyclic nucleotide-gated K+ 4 (Norway Rat) HCN4 (Accession NM 021658) 19atggacaagc tgccgccgtc catgcgcaag cggctctaca gccttccgca gcaggtgggg 60gccaaggcgt ggatcatgga cgaggaagag gatggtgagg aagagggggc cgggggcctc 120caggacccaa gccgaaggag cattcggctg cggccgctgc cctcgccctc gccctcggtg 180gccgccggct gctccgagtc ccggggtgcg gccctcgggg cggcagacag cgaggggccg 240ggccgcagcg ccggcaagtc cagcaccaac ggtgactgca ggcgcttccg cgggagtctg 300gcctcgctgg gcagccgggg cggcggcagt ggtggagcag ggggcggcag cagtctcggg 360cacctgcatg actccgcgga ggagcggcgg ctcatcgccg ctgagggcga tgcgtccccc 420ggcgaggaca ggacgccccc gggcctggcg accgagcccg agcgcccggg cgccgcggca 480caacccgcag cctcgccgcc gccccaacag ccgccgcagc cggcctccgc ctcctgcgag 540cagccctcgg cggacacagc tatcaaagtg gaaggaggcg cggccgccag cgaccagatc 600ctccctgagg ccgaggtgcg cctgggccag agcggcttca tgcagcgcca gttcggtgcc 660atgctgcaac ctggggtcaa caaattctcg ctaaggatgt tcggcagcca gaaagcagtg 720gagcgtgagc aggagagggt taagtcagct gggttttgga ttatccaccc ctacagcgac 780ttcagatttt actgggacct gacgatgctg ttgctgatgg tggggaatct gatcatcatc 840cctgtgggca tcaccttctt caaggatgag aacaccaccc cctggatcgt cttcaacgtg 900gtgtcagaca cattcttcct cattgacttg gtcctcaact tccgcacggg gatcgtggtg 960gaggacaaca cagaaatcat ccttgaccca cagcggatca agatgaagta cctgaaaagc 1020tggtttgtgg tggacttcat ctcctccatc cccgtggact acatcttcct tatagtggag 1080actcgcattg actcggaggt ctacaaaacc gccagggctc tgcgcattgt ccgcttcacg 1140aagatcctca gcctcctgcg cctcctgcgg ctttcccgcc tcattcggta cattcaccag 1200tgggaagaga tcttccacat gacctacgac ctggccagtg ccgtggtacg catcgtgaac 1260ctcattggca tgatgcttct gctttgccac tgggatggct gcctgcagtt cctggtgccc 1320atgctgcagg acttccccca tgactgctgg gtgtccatca acggcatggt gaataactcc 1380tgggggaagc agtactccta tgccctcttc aaggccatga gccacatgct gtgtattggg 1440tacggacggc aggcacccgt aggcatgtct gacgtctggc tcaccatgct cagcatgatc 1500gtgggcgcca cctgctatgc catgttcatc gggcacgcca ctgccctcat ccagtcgctg 1560gactcctccc ggcgccagta ccaggagaag tacaagcagg tggagcagta catgtccttc 1620cacaagctcc cgcctgacac caggcagcgc atccacgact actacgaaca ccgctaccag 1680ggcaagatgt ttgacgagga aagcatcctg ggtgagctga gtgagccgct tcgagaggag 1740atcatcaact ttaactgccg gaagctggtg gcatccatgc cactgttcgc caatgcagac 1800cccaactttg tgacgtctat gctgaccaag ttgcgttttg aggtctttca gcctggggac 1860tacatcatcc gtgaaggcac catcggcaag aagatgtact ttatccagca cggcgtggtc 1920agtgtgctca ctaagggcaa caaggagacc aagctggctg atggctccta ttttggagag 1980atctgcttgc tgacccgagg ccgtcgcaca gcgagcgtga gggcggatac ttactgccgc 2040ctctactcac tgagcgtgga caacttcaac gaggtgctgg aggagtatcc catgatgcgc 2100agggctttcg agacggttgc gctggaccgt ctggaccgca taggcaagaa gaactccatc 2160ctcctccaca aggtgcagca cgacctcaac tcaggcgtct tcaactacca agagaacgag 2220atcatccagc agatcgtgcg gcatgaccgt gagatggccc actgtgctca ccgcgtccag 2280gctgctgcct cagccacccc aaccccaacg cctgtcatat ggaccccact gatccaggca 2340ccactgcagg ctgctgctgc tactacttcg gtggccatag ccctcacaca ccacccccgc 2400ctgccagccg ctatcttccg gccccctccc ggacctgggc tgggtaacct gggggctgga 2460cagacaccga ggcacccaag gaggttgcag tccttgatcc cttcagcgct aggctctgct 2520tcaccagcca gcagcccctc acaggtggac acaccgtctt catcttcctt ccacatccaa 2580cagctggctg gattctctgc acctcctgga ttgagtcctc tcttgccctc ctctagctct 2640tccccacctc caggagcctg cagttctccc ccagccccca ctccatccac ctccactgct 2700gccaccacca ccgggttcgg ccactttcat aaggcgctag gtggctccct gtcttcctct 2760gattccccgc tgctcacccc actgcaaccg ggcgctcgct ctccacaggc tgcccagccg 2820ccacccccac tgcctggggc ccgaggaggc ctgggactcc tggagcactt cttgccgccc 2880ccaccttcgt cccggtcacc atcatctagc cctgggcagc tgggccagcc tcctggagag 2940ttgtccccag gtctggcagc tggtccacca agtacaccag agacaccccc gcggcccgaa 3000cggccatcct ttatggcagg ggcctctggg ggggcttctc ctgtagcctt taccccccga 3060ggaggcctca gccctccggg ccacagccca ggacccccaa gaactttccc gagtgcccca 3120ccccgggcct ctggctccca tggttccctg ctcctgccac ctgcatccag ccctccgcct 3180ccccaggtcc cacagcgcag gggcacacca cccctcaccc ccggccgcct cacacaggac 3240ctgaagctca tctcagcctc tcagccagcc ctcccccagg atggggcaca gactctacgc 3300agggcctctc ctcactcctc aggggagtcg atggctgcct tctcactcta ccccagagct 3360gggggtggca gtgggagcag tgggggcctt gggcctcctg gaaggccata tggtgccatc 3420ccaggccagc atgtcacttt gcctcggaag acatcctcag gttctttgcc acccccactt 3480tctttgtttg gggcaagagc cgcctcttct ggagggcccc ctctgactgc tgcaccccag 3540agggaacctg gcgctaggtc cgagccagta cgctccaaac tgccgtctaa tttatga 3597202733DNAMus musculusgene(1)..(2733)hyperpolarization-activated, cyclic nucleotide-gated K+ 1 (house mouse) HCN1 (Accession NM 010408) 20atggaaggcg gcggcaaacc caactccgcg tccaacagcc gcgacgatgg caacagcgtc 60ttcccctcca aggcgcccgc gacggggccg gtggcggccg acaagcgcct ggggaccccg 120ccgaggggcg gcgcggccgg gaaggaacat ggcaactccg tgtgcttcaa ggtggacggc 180ggcggaggag aggagccggc gggcagcttc gaggatgccg aggggccccg gcggcagtat 240ggtttcatgc agaggcagtt cacctccatg ctgcagcctg gggtcaacaa attctccctc 300cgcatgtttg ggagccagaa ggcggtggag aaggagcagg aaagggttaa aactgcaggc 360ttctggatta tccatccgta cagtgacttc aggttttatt gggatttaat catgcttata 420atgatggttg gaaatttggt catcatacca gttggaatca cgttcttcac agagcagacg 480acaacaccgt ggattatttt caacgtggca tccgatactg ttttcctgtt ggacttaatc 540atgaatttta ggactgggac tgtcaatgaa gacagctcgg aaatcatcct ggaccctaaa 600gtgatcaaga tgaattattt aaaaagctgg tttgtggtgg acttcatctc atcgatcccg 660gtggattata tctttctcat tgtagagaaa gggatggact cagaagttta caagacagcc 720agagcacttc gtatcgtgag gtttacaaaa attctcagtc tcttgcggtt attacgcctt 780tcaaggttaa tcagatacat acaccagtgg gaagagatat tccacatgac ctatgacctc 840gccagtgctg tggtgaggat cttcaacctc attggcatga tgctgcttct gtgccactgg 900gatggctgtc ttcagttcct ggttcccctg ctgcaggact tcccaccaga ttgctgggtt 960tctctgaatg aaatggttaa tgattcctgg ggaaaacaat attcctacgc actcttcaaa 1020gctatgagtc acatgctgtg cattggttat ggcgcccaag cccctgtcag catgtctgac 1080ctctggatta ccatgctgag catgattgtg ggcgccacct gctacgcaat gtttgttggc 1140catgccacag ctttgatcca gtctttggac tcttcaagga ggcagtatca agagaagtat 1200aagcaagtag agcaatacat gtcattccac aagttaccag ctgacatgcg ccagaagata 1260catgattact atgagcaccg ataccaaggc aagatcttcg atgaagaaaa tattctcagt 1320gagcttaatg atcctctgag agaggaaata gtcaacttca actgccggaa actggtggct 1380actatgcctc tttttgctaa cgccgatccc aatttcgtga cggccatgct gagcaagctg 1440agatttgagg tgttccagcc cggagactat atcattcgag aaggagctgt ggggaagaaa 1500atgtatttca tccagcacgg tgttgctggc gttatcacca agtccagtaa agaaatgaag 1560ctgacagatg gctcttactt cggagagata tgcctgctga ccaagggccg gcgcactgcc 1620agtgtccgag ctgataccta ctgtcgtctt tactcccttt cggtggacaa tttcaatgag 1680gtcttggagg aatatccaat gatgagaaga gcctttgaga cagttgctat tgaccgactc 1740gatcggatag gcaagaaaaa ctctattctc ctgcagaagt tccagaagga tctaaacact 1800ggtgttttca acaaccagga gaacgagatc ctgaagcaga tcgtgaagca tgaccgagag 1860atggtacaag ctatccctcc aatcaactat cctcaaatga cagccctcaa ctgcacatct 1920tcaaccacca ccccaacctc ccgcatgagg acccaatctc cgccagtcta caccgcaacc 1980agcctgtctc acagcaatct gcactcaccc agtcccagca cacagacgcc ccaaccctca 2040gccatccttt caccctgctc ctataccaca gcagtctgca gtcctcctat acagagcccc 2100ctggccacac gaactttcca ttatgcctct cccactgcgt cccagctgtc actcatgcag 2160cagcctcagc agcaactacc gcagtcccag gtacagcaga ctcagactca gactcagcag 2220cagcagcagc aacagcagca gcagcagcag cagcaacagc aacaacagca gcagcagcag 2280cagcagcagc agcagcagca gcagcagcag cagcagcagc agcagccaca gacacctggt 2340agctccacac cgaaaaatga agtgcacaag agcacacaag cccttcataa caccaacctg 2400accaaagaag tcaggcccct ttccgcctcg cagccttctc tgccccatga ggtctccact 2460ttgatctcca gacctcatcc cactgtgggc gaatccctgg cctctatccc tcaacccgtg 2520gcagcagtcc acagcactgg ccttcaggca gggagcagga gcacagtgcc acaacgtgtc 2580accttgttcc gacagatgtc ctcgggagcc atccccccca accgaggagt gcctccagca 2640ccccctccac cagcagctgt gcagagagag tctccctcag tcctaaatac agacccagat 2700gcagaaaaac cccgttttgc ttcgaattta tga 2733212592DNAMus musculusgene(1)..(2592)hyperpolarization-activated, cyclic nucleotide-gated K+ 2 (House Mouse) HCN2 (Accession NM 008226) 21atggatgcgc gcgggggcgg cgggcggccg ggcgatagtc cgggcacgac ccctgcgccg 60gggccgccgc caccgccgcc gccgcccgcg ccccctcagc ctcagccacc acccgcgcca 120cccccgaacc ccacgacccc ctcgcacccg gagtcggcgg acgagcccgg cccgcgcgcc 180cggctctgca gccgcgacag cgcctgcacc cctggcgcgg ccaagggcgg cgcgaatggc 240gagtgcgggc gcggggagcc gcagtgcagc cccgagggcc ccgcgcgcgg ccccaaggtt 300tcgttctcat gccgcggggc ggcctccggg ccctcggcgg ccgaggaggc gggcagcgag 360gaggcgggcc cggcgggtga gccgcgcggc agccaggcta gcttcctgca gcgccaattc 420ggggcgcttc tgcagcccgg cgtcaacaag ttctccctgc ggatgttcgg cagccagaag 480gccgtggagc gcgagcagga acgcgtgaag tcggcggggg cctggatcat ccacccctac 540agcgacttca ggttctactg ggacttcacc atgctgttgt tcatggtggg aaatctcatt 600atcattcccg tgggcatcac tttcttcaag gacgagacca ccgcgccctg gatcgtcttc 660aacgtggtct cggacacttt cttcctcatg gacttggtgt tgaacttccg caccggcatt 720gttattgagg acaacacgga gatcatcctg gaccccgaga agataaagaa gaagtacttg 780cgtacgtggt tcgtggtgga cttcgtgtca tccatcccgg tggactacat cttcctcata 840gtggagaagg gaatcgactc cgaggtctac aagacagcgc gtgctctgcg catcgtgcgc 900ttcaccaaga tcctcagtct gctgcggctg ctgcggctat cacggctcat ccgatatatc 960caccagtggg aagagatttt ccacatgacc tacgacctgg caagtgcagt gatgcgcatc 1020tgtaacctga tcagcatgat gctactgctc tgccactggg acggttgcct gcagttcctg 1080gtgcccatgc tgcaagactt ccccagcgac tgctgggtgt ccatcaacaa catggtgaac 1140cactcgtgga gcgagctcta ctcgttcgcg ctcttcaagg ccatgagcca catgctgtgc 1200atcggctacg ggcggcaggc gcccgagagc atgacagaca tctggctgac catgctcagc 1260atgatcgtag gcgccacctg ctatgccatg ttcattgggc acgccactgc gctcatccag 1320tccctggatt cgtcacggcg ccaataccag gagaagtaca agcaagtaga gcaatacatg 1380tccttccaca aactgcccgc tgacttccgc cagaagatcc acgattacta tgaacaccgg 1440taccaaggga agatgtttga tgaggacagc atccttgggg aactcaacgg gccactgcgt 1500gaggagattg tgaacttcaa ctgccggaag ctggtggctt ccatgccgct gtttgccaat 1560gcagacccca acttcgtcac agccatgctg acaaagctca aatttgaggt cttccagcct 1620ggagattaca tcatccgaga ggggaccatc gggaagaaga tgtacttcat ccagcatggg 1680gtggtgagcg tgctcaccaa gggcaacaag gagatgaagc tgtcggatgg ctcctatttc 1740ggggagatct gcttgctcac gaggggccgg cgtacggcca gcgtgcgagc tgacacctac 1800tgtcgcctct actcactgag tgtggacaat ttcaacgagg tgctggagga ataccccatg 1860atgcggcgtg cctttgagac tgtggctatt gaccggctag atcgcatagg caagaagaac 1920tccatcttgc tgcacaaggt tcagcatgat ctcagctcag gtgtgttcaa caaccaggag 1980aatgccatca tccaggagat tgtcaaatat gaccgtgaga tggtgcagca ggcagagctt 2040ggccagcgtg tggggctctt cccaccaccg ccaccaccgc aggtcacatc ggccattgcc 2100accctacagc aggctgtggc catgagcttc tgcccgcagg tggcccgccc gctcgtgggg 2160cccctggcgc taggctcccc acgcctagtg cgccgcgcgc ccccagggcc tctgcctcct 2220gcagcctcgc cagggccacc cgcagcaagc cccccggctg caccctcgag ccctcgggca 2280ccgcggacct caccctacgg tgtgcctggc tctccggcaa cgcgcgtggg gcccgcattg 2340cccgcacgtc gcctgagccg cgcctcgcgc ccactgtccg cctcgcagcc ctcgctgccc 2400catggcgtgc ccgcgcccag ccccgcggcc tctgcgcgcc cggccagcag ctccacgccg 2460cgcctgggac ccgcacccac cgcccggacc gccgcgccca gtccggaccg cagggactca 2520gcctcgccgg gcgctgccag tggcctcgac ccactggact ctgcgcgctc gcgcctctct 2580tccaacttgt ga 2592222340DNAMus musculusgene(1)..(2340)hyperpolarization-activated, cyclic nucleotide-gated K+ 3 (House Mouse) HCN3 (Accession NM 008227) 22atggaggagg aggcgcggcc ggcggcgggg gccggcgaag cggcgacccc tgcacgcgag 60acgcctcctg cggctccggc ccaggcccgc gcggcctcag gtggggtgcc ggagtctgcg 120cccgagccga agaggcggca gctcgggacg ctgctgcagc cgacggtcaa caagttctct 180ctccgggtct tcggcagcca caaagcagta gaaatcgagc aggagagggt gaagtccgcc 240ggggcctgga tcatccaccc ctacagcgac ttccggtttt actgggatct catcatgctg 300ctgctgatgg tggggaacct catagttctg cctgtgggta tcactttctt caaggaggag 360aactctccac cctggatcgt cttcaatgtc ctctctgaca ctttcttcct gctggatctg 420gtgctcaact tccgaactgg catcgtggtg gaggaaggtg ccgagatcct gctggcgcca 480agggccatcc gaacgcgtta cctgcgcacc tggttcctgg ttgatctgat ctcctccatc 540cctgtggatt atatcttcct agtggtggag ctggagccac gactagatgc tgaggtctac 600aaaacggcac gggccctgcg catcgttaga ttcaccaaga tccttagcct gctgcggctg 660ctccgcctct cccgcctcat ccgctacata caccagtggg aggagatctt tcacatgacc 720tacgacctgg ccagtgcagt ggttcgcatc ttcaacctca ttggaatgat gttgctgctg 780tgtcactggg acggctgtct gcagtttctg gtccctatgc tgcaggactt cccgtccgac 840tgctgggtct ccatgaaccg catggtgaac cactcgtggg gccgccagta ttcccacgcc 900ctgttcaagg ccatgagtca catgctatgc attggctatg ggcagcaggc accggtaggc 960atgcctgacg tctggctcac catgctcagt atgattgtgg gcgccacgtg ttatgccatg 1020ttcatcggtc acgccaccgc cctcatccag tccctggact cttcccggcg acagtaccag 1080gagaagtaca agcaggtgga gcagtacatg tccttccaca agctgcccgc tgacacccgg 1140cagcgcatcc acgagtacta cgagcatcgc taccagggca agatgtttga tgaagagagc 1200atcctggggg agctgagcga gccacttcgg gaggagatta ttaacttcac ctgccggggc 1260ctggtggccc acatgccgct gtttgctcat gctgacccca gcttcgtcac cgcagtgctc 1320accaagctcc gttttgaggt cttccaacca ggggacctgg tggtgcgtga gggctccgtg 1380ggcaggaaga tgtacttcat ccagcacggg ctgctgagtg tgctggcacg tggcgcccgc 1440gacacccgcc tcactgatgg atcctacttt ggggagatct gcctgctgac tcgaggtcgg 1500agaacagcca gtgtaagggc tgacacctat tgtcgcctct actcgctcag cgtggaccac 1560ttcaatgcgg tgcttgagga gttcccaatg atgcgcaggg cttttgagac ggtggccatg 1620gaccggcttc ggcgcatcgg caaaaagaat tcgatactgc agcggaaacg ctctgagccg 1680agtccaggca gcagcggtgg cgtcatggag cagcatttgg tacaacacga cagagacatg 1740gctcgtggtg ttcggggcct ggctcctggt acaggagctc gactcagtgg aaagccagtg 1800ctgtgggaac cactggtgca cgcccctctg caggcagctg ctgtgacctc caacgtggcc 1860atagccttga ctcaccagcg aggccctctg cccctctccc ctgattctcc agccaccctc 1920ctagctcgat ctgctagacg ctcagcaggc tccccagcct ccccactggt gcctgtccga 1980gcaggtcctc tgctggcccg gggaccctgg gcgtccactt ctcgcctgcc tgctccacct 2040gcccgaaccc tccatgccag cctatcccgg acagggcgtt cccaggtatc tctgttgggc 2100cctcccccag gaggaggtgc tcggaggcta ggacctcggg gccgcccact ttctgcctcg 2160caaccctctc tgcctcagcg agcaacaggg gatggctctc ctaggcgtaa aggctctgga 2220agtgagcgcc tgcccccctc tgggctcttg gccaaacctc cagggacagt ccagccaccc 2280aggtcatcag tgcctgagcc agttaccccc agaggtcccc aaatttctgc caacatgtga 2340233606DNAMus musculusgene(1)..(3606)similar to hyperpolarization-activated, cyclic nucleotide-gated K+ 4; hyperpolarization-activated, cyclic nucleotide-gated potassium channel 4 (House Mouse) HCN4 (Accession XM 287905) 23atggacaagc tgccgccgtc catgcgcaag cggctctaca gccttccgca gcaggtgggg 60gccaaggcgt ggatcatgga cgaggaagag gatggtgagg aagaaggggc cgggggccgc 120caggacccca gccgaaggag catccggctg cggccgctgc cctcgccctc tccctcggtg 180gctgcgggct gctcggagtc ccggggtgcg gccctcgggg cgacagagag cgaggggccg 240ggccgcagcg ccggcaagtc cagcaccaac ggtgactgca ggcgcttccg cgggagtctg 300gcctcgctgg gcagccgggg cggcggcagt ggtggagcag ggggcggcag cagtctcggg 360cacctgcatg actccgcgga ggaacggcgg ctcatcgccg ctgagggcga tgcgtccccc 420ggcgaggaca ggacgccccc gggcctggcg accgaacccg agcgcccggc caccgcggca 480caacccgcag cctcgccgcc gccccagcag ccgccgcagc cggcctctgc ctcctgcgag 540cagccctcgg cggacaccgc tatcaaagtg gagggaggcg cggccgccag cgaccagatc 600ctccccgagg ccgaggtgcg cctgggccag agcggcttca tgcagcgcca gttcggtgcc 660atgctgcaac ctggggtcaa caaattctcc ctaaggatgt tcggcagcca gaaagcggtg 720gagcgcgagc aggagagggt taagtcagca gggttttgga ttatccaccc ctacagtgac 780ttcagatttt actgggacct gacgatgctg ttgctgatgg tggggaatct gatcatcata 840cccgtgggca tcaccttctt caaggatgag aacaccacac cctggatcgt cttcaatgtg 900gtgtcagaca cattcttcct cattgacttg gtcctcaact tccgcacggg gatcgtggtg 960gaggacaaca cagaaatcat ccttgacccg cagaggatca agatgaagta cctgaaaagc 1020tggtttgtgg tagatttcat ctcctccatc cctgtcgact acatcttcct tatagtggag 1080actcgcattg actcggaggt ctacaaaacc gctagggctc tgcgcattgt ccgtttcact 1140aagatcctca gcctcctgcg cctcttgagg ctttcccgcc tcattcgata cattcatcag 1200tgggaagaga tcttccacat gacctatgac ctggccagcg ccgtggtacg catcgtgaac 1260ctcattggca tgatgcttct gctgtgtcac tgggatggct gcctgcagtt cctagtgccc 1320atgctgcagg acttccccca tgactgctgg gtgtccatca atggcatggt gaataactcc 1380tgggggaagc agtattccta cgccctcttc aaggccatga gccacatgct gtgcattggg 1440tatggacggc aggcacccgt aggcatgtct gacgtctggc tcaccatgct cagcatgatc 1500gtgggggcca cctgctatgc catgttcatc ggccacgcca ctgccctcat ccagtcgcta 1560gactcctccc ggcgccagta ccaggagaag tataaacagg tggagcagta catgtccttc 1620cacaagctcc cgcctgacac ccgacagcgc atccatgact actatgaaca ccgctaccaa 1680ggcaagatgt ttgatgagga aagcatcctg ggtgagctga gtgagccact tcgagaggag 1740atcatcaact ttaactgccg aaagctggtg gcatccatgc cactgtttgc caacgcagat 1800cccaactttg tgacatccat gctgaccaag ttgcgtttcg aggtcttcca gcctggggat 1860tacatcatcc gcgaaggcac catcggcaag aagatgtact ttatccagca cggcgtggtc 1920agcgtgctca ctaagggcaa caaagagacc aagctggctg atggctccta ttttggagag 1980atctgcttgc tgacccgggg tcggcgcaca gccagcgtca gagcggatac ttattgccgc 2040ctctactcac tgagcgtgga caacttcaat gaggtgctgg aggagtatcc catgatgcgg 2100agggccttcg agacggttgc gctggaccgc ctggaccgca taggcaagaa gaactccatc 2160ctcctccaca aggtgcagca cgacctcaac tcaggcgtct tcaactacca agagaacgag 2220atcatccagc

agatcgtgcg gcatgaccgt gagatggccc actgtgctca ccgcgtccag 2280gctgccgcct cagccacccc aacccccacg cctgttatat ggaccccgct gatccaggcg 2340ccactgcagg ctgctgctgc tactacttcg gtggccatag ccctcacaca ccacccccgc 2400ctgcccgccg ccatcttccg gccccctccc ggacctgggc tgggcaacct tggggctgga 2460cagacaccga ggcacccaag gaggctgcag tccttgatcc cttcagctct gggctctgct 2520tcacccgcca gcagcccctc acaggtggac acaccgtctt catcctcctt ccacatccaa 2580cagctggctg gattctctgc acctcctgga ttgagccctc tcctgccctc ctctagctct 2640tccccacctc caggagcctg cggttcccca ccagccccca caccctccac ctccactgcc 2700gccgccgcct ccaccactgg gttcggccac tttcacaagg cgctgggtgg ctccctgtca 2760tcctctgact ccccgctgct caccccactg caaccaggcg ctcgctctcc acaggctgcc 2820cagccaccac ccccactgcc tggggcccga ggaggtctgg gactcctgga gcacttcttg 2880ccgcccccac cctcctccag gtcaccatca tccagccctg ggcagctggg ccagcctcct 2940ggagagttgt ccctaggtct ggcagctggt ccatcaagta caccagagac acccccacgg 3000cctgagcgac catccttcat ggcaggggcc tctggagggg cttctcctgt agcctttacc 3060ccccgaggag gcctcagtcc tccgggccac agcccggggc ccccaagaac tttcccgagt 3120gccccacccc gggcctctgg ctcccatggt tccctgctcc tgccacctgc atccagccct 3180ccacctcccc aggtcccaca gcgcaggggc acaccacccc tcacccctgg ccgcctcaca 3240caggacctga agctcatctc agcctctcag ccagccctcc cccaggatgg ggcacagact 3300ctccgcaggg cctcgcctca ctcctcaggg gagtcggtgg ctgccttctc actctacccc 3360agagctgggg gtggcagtgg gagtagtggg ggccttgggc ctcctggaag gccatatggt 3420gccatcccag gccaacatgt cactttgcct cggaagacat cctcaggttc tttgccaccc 3480ccactttctt tgtttggggc aagagccgcc tcttctggag ggccccctct gactactgct 3540gcaccccaga gggaacctgg cgctaggtct gagccagtac gctccaaact gccgtctaat 3600ttatga 3606242469DNAOryctolagus cuniculusgene(1)..(2469)uORF and hyperpolarization-activated cyclic nucleotide-gated channel 1 (Rabbit) HCN1 (Accession AF 168122) 24atggcaacag cgtcttcccc gccaaggcgc ccgcgacggg cgcggggcct ggaggacgct 60gaggggccgc ggcggcagta cggcttcatg cagcgacagt tcacctccat gctgcagccc 120ggggtcaaca aattctccct ccgcatgttc gggagccaga aggcggtgga gaaggagcag 180gaaagggtta aaactgcagg cttctggatt atccaccctt acagcgattt caggttttat 240tgggatttaa taatgcttat aatgatggtt ggaaatctag tcatcatacc agttggaatc 300acattcttta cagaacagac aacaacacca tggattattt tcaatgtggc atcagataca 360gtttttctat tggacttgat catgaatttt aggactggga ctgtcaatga agacagttct 420gaaatcatcc tggaccctaa agtaatcaag atgaattatt taaaaagctg gtttgtggtt 480gacttcatct catcaatccc agtggattat atctttctta ttgtagaaaa aggaatggat 540tcagaagttt acaagacagc cagggcactt cgcattgtga ggtttacaaa aattctcagt 600ctcttgcgtt tattacgact ttcaagatta attagataca tacatcagtg ggaagagata 660tttcatatga cgtatgatct tgccagtgcg gtggtgagga tttttaatct catcggcatg 720atgctgctct tgtgtcactg ggatggttgt ctgcagttct tggtcccact attgcaggat 780ttcccaccag attgctgggt gtccctcaat gaaatggtta atgattcctg gggaaagcag 840tattcatacg cgctcttcaa agctatgagt cacatgctgt gcattgggta tggagcccaa 900gccccagtca gcatgtctga cctctggatt accatgttga gcatgattgt cggggccacc 960tgctacgcca tgtttgttgg ccatgccact gctttaatcc aatctttgga ttcttcaagg 1020cggcagtatc aagagaagta taagcaagta gaacaataca tgtcattcca taagttacca 1080gctgatatgc gtcagaagat acatgattac tatgaacaca gatatcaagg caaaatcttt 1140gatgaggaaa atattctcaa tgaactgaat gatcctctga gagaggagat agtcaacttc 1200aactgtcgga aactagtggc tacaatgcct ctttttgcta acgcagatcc gaattttgtg 1260actgccatgc tgagcaagtt gagatttgag gtatttcaac ctggagatta tatcatacga 1320gaaggagctg tagggaaaaa aatgtatttc attcagcatg gtgtggcggg tgtcatcaca 1380aagtcaagta aagaaatgaa gctgacagat ggctcttact ttggagagat ttgtttgctg 1440actaaaggac gccgcacagc tagtgttcga gctgatacct attgtcgtct ttattccctt 1500tcggtggaca atttcaatga ggtcctggaa gaatacccta tgatgagaag agcctttgag 1560actgttgcta ttgaccgact agatcgaata ggaaagaaaa actccattct tctgcaaaag 1620ttccagaagg atctgaacac tggtgttttt aacaaccagg agaatgagat cctgaagcag 1680attgtgaaac atgacaggga gatggtgcag gcgatcgctc ccatcagtta tcctcaaatg 1740acagccctga attccacctc gtccactgct accccgacct cacgcatgag gacccagtct 1800ccaccggtgt acacagcaac cagcctgtct cacagcaacc tgcactcccc cagccccagc 1860actcagaccc cccagccttc tgccatcctc tcgccctgct cctacaccac tgcggtctgc 1920agtcctcctg tacagagccc gctggccact cgaactttcc actacgcctc ccccactgcc 1980tcccagttgt cactcatgcc tcagcagcag cagcagcccc aggcacctca gactcagccg 2040cagcagccgc cccagcagcc gcagacgccc ggcagcgcca cgccgaagaa cgaagtgcac 2100cggagcacgc aggcgcttcc taataccagc ctgaccaggg aggtcaggcc cctgtccgcc 2160tcgcagcctt cgctgccgca cgaggtttcc actctgattt ccagacctca tcccactgtg 2220ggcgagtccc tggcctccat cccccagccc gtggcagctg tccacagcgc gggcctccag 2280gcagcgggca ggagcactgt ccctcagcga gtcaccctgt ttcgacagat gtcctccgga 2340gccattcccc ccaaccgagg agtgcctccg gcaccccctc caccagcagc ccctcttcag 2400agagaggctt cctcagtctt aaacacagac ccggaggcag aaaagccacg atttgcttcg 2460aatttatga 2469252817DNAOncorhynchus mykiss (Rainbow Trout)gene(1)..(2817)hyperpolarization-activated cyclic nucleotide-gated cation channel 1 HCN1 (Accession AF 421883) 25atggaagata aatcaaattc gttctccagc aacaaagaag gggagaaagc agatgggaat 60aatgtatttc aaaggcaaga ctcgatacag aagaataata tggggagcca gaacatgaaa 120ggaggggacc atggaaactc ggtgggcttc aagggggacc gggaggaagc cttggtcggg 180ttcgacgata tagacgggtc cggaaaccga catggcttta tgcagcggca atttggagcg 240atgatgcagc ccggcgtcaa taagttctcc ctgcgaatgt tcggcagtca gaaagccgtt 300gagaaagagc aagaaagggt ccagacggct ggatactgga tcattcatcc ctatagcgat 360tttaggttct actgggactt ggtaatgctg gtcatgatga tggggaacct gatcatcatt 420cctgtaggaa taaccttctt ctcggagcag accaccacca cctggctaat attcaacgtc 480gcatcagaca ccatcttcct cgtggatctg gtcatgaact tccgcacggg gatcgtcaac 540gaggagagct ctgagatcat cctggacccc aaggtcataa agatgaacta cctgaagagc 600tggtttgtgg tcgacttcct ctcgtccata ccagtggatt atatatttct aatagtggaa 660aaggggtttg actcagaggt gtacaagacg gcgagggcgc tgaggatcgt gaggtttact 720aagattctgt ctcttctgag gctactgaga ctttcccggc tcatcagata catacaccag 780tgggaggaga ttttccatat gacgtatgac ctggccagtg ctgtggtaag aatatttaat 840ctgataggga tgatgctact gctgtgccac tgggacggtt gtctgcagtt cctggtccca 900ctcctacaag atttccctca agattgttgg gtgtcgctaa acggtatggt taatgactcg 960tggggtaagc agtactcgta cgcactcttc aaggccatga gtcacatgct gtgtatcggg 1020tacggcgccc gggcccccgt cagcatgtcc gacctgtgga tcaccatgct cagtatgatc 1080gtgggcgcca cctgctacgc catgttcgtg ggtcacgcca ccgctctcat ccaatcactg 1140gactcctccc gcaggcagta ccaagagaag tataaacaag tggagcagta catgtcgttc 1200cacaagctcc ccgcagacat gcggcagaag atccatgatt actatgagca tcgttatcag 1260ggcaagatct ttgacgagga caatatcctg agtgagctca acgacccgct caaagaggaa 1320attgtgaact tcaactgtcg gaagctggtg gctaccatgc cgctgttcgc caacgcggac 1380cccaacttcg tgacgggcat gttgagcaag ctgaagttcg aggtgttcca gcccaacgat 1440tacatcatca gggagggcac cgtgggcaag aagatgtatt tcattcaaca tggtgtggcc 1500agtgtcatca ccaagcttaa caaagagatg aagctgacgg atggctctta ctttggagag 1560atctgtctgc tgacgaaggg gagacgcacg gcgagcgttc gcgctgacac ctactgccgt 1620ctcttctccc tctctgtgga tcacttcaac gaggtgttgg aagagtaccc tatgatgcgc 1680cgcgctttcg agaccgtagc catcgaccgc ctggaccgca tcgggaagaa gaacagcctg 1740ctcctccaga agttccagaa ggatctgaac gctggggtgt tcaacacgca ggagaacgaa 1800atactgaagc agataatccg tcaggacagg gagatggtga tgatggtgga ccgcaagcag 1860tcggtcacag ggatgtcggt cacagggatg tcggtcacag ggatgaacac caccccgata 1920tctggaaact ccatcattaa ctcgccggct cagccgccct acaccactgc cctgggcaac 1980aaccagttcc agcagtcagc cacctctttg acctacagcg cttcggccgt caccgctccc 2040tcctccgcag ccaccgcccg catcctgcct gcctcggcgc agggtgtcta tcccgtcccc 2100agcgtcatcc acggcaacct gaactcatcc tcgcccgtcc cccagactcc cctctctctc 2160catcagcaag ggtccatcat gtccccggta tccttcacca cggcggtgtg cagtccaccc 2220gtgcagaccc ctgggctggc gggccgcagc ttccagtacg gctcgcccac cgcctcccag 2280ctctccctta tccagcagcc gctgcctact gccctaccac cgcagcaacc actaccacag 2340ccacagcaac caggaggagc agcggcctcc tcagcaacac aacaaccaca acaacagcag 2400caagtcccgt cacctcagag gagtgacagc ctccacaagg ccagccatgc tctccagtcg 2460ggaagcctga gtcgagacgt gcgccacctc tctgcctccc agccctccct gccccacgac 2520acgtccctgg ggccccgagc gcaccctgca gcgtccgggg actccctggc ctccattgcc 2580ccgccggtgg ctgcggtcca gggtatgggt atacagagcg gtctccgcac cacagtgccc 2640cagagggtca acctgttccg ccagatgtca tcaggagcgt tgcctccggt gcgagcggtg 2700tcctctgcag cccagcacag ggattccact ggttctagga gagattctag aagagattct 2760accttaagca gtacagagac tgagcaagat aagatgcggt tcgcatcaaa tttatga 2817262160DNAHomo Sapiensgene(1)..(2160)hyperpolarization-activated, cyclic nucleotide-gated potassium channel 2 (HCN2) (partial coding sequence) 26atggacgcgc gcgggggcgg cgggcggccc ggggagagcc cgggcgcgac ccccgcgccg 60gggccgccgc cgccgccgcc gcccgcgccc ccccaacagc agccgccgcc gccgccgccg 120cccgcgcccc ccccgggccc cgggcccgcg cccccccagc acccgccccg ggccgaggcg 180ttgcccccgg aggcggcgga tgagggcggc ccgcggggcc ggctccgcag ccgcgacagc 240tcgtgcggcc gccccggcac cccgggcgcg gcgagcacgg ccaagggcag cccgaacggc 300gagtgcgggc gcggcgagcc gcagtgcagc cccgcggggc ccgagggccc ggcgcggggg 360cccaaggtgt cgttctcgtg ccgcggggcg gcctcggggc ccgcgccggg gccggggccg 420gcggaggagg cgggcagcga ggaggcgggc ccggcggggg agccgcgcgg cagccaggcc 480agcttcatgc agcgccagtt cggcgcgctc ctgcagccgg gcgtcaacaa gttctcgctg 540cggatgttcg gcagccagaa ggccgtggag cgcgagcagg agcgcgtcaa gtcggcgggg 600gcctggatca tccacccgta cagcgacttc aggttctact gggacttcac catgctgctg 660ttcatggtgg gaaacctcat catcatccca gtgggcatca ccttcttcaa ggatgagacc 720actgccccgt ggatcgtgtt caacgtggtc tcggacacct tcttcctcat ggacctggtg 780ttgaacttcc gcaccggcat tgtgatcgag gacaacacgg agatcatcct ggaccccgag 840aagatcaaga agaagtatct gcgcacgtgg ttcgtggtgg acttcgtgtc ctccatcccc 900gtggactaca tcttccttat tgtggagaag ggcattgact ccgaggtcta caagacggca 960cgcgccctgc gcatcgtgcg cttcaccaag atcctcagcc tcctgcggct gctgcgcctc 1020tcacgcctga tccgctacat ccatcagtgg gaggagatct tccacatgac ctatgacctg 1080gccagcgcgg tgatgaggat ctgcaatctc atcagcatga tgctgctgct ctgccactgg 1140gacggctgcc tgcagttcct ggtgcctatg ctgcaggact tcccgcgcaa ctgctgggtg 1200tccatcaatg gcatggtgaa ccactcgtgg agtgaactgt actccttcgc actcttcaag 1260gccatgagcc acatgctgtg catcgggtac ggccggcagg cgcccgagag catgacggac 1320atctggctga ccatgctcag catgattgtg ggtgccacct gctacgccat gttcatcggc 1380cacgccactg ccctcatcca gtcgctggac tcctcgcggc gccagtacca ggagaagtac 1440aagcaggtgg agcagtacat gtccttccac aagctgccag ctgacttccg ccagaagatc 1500cacgactact atgagcaccg ttaccagggc aagatgtttg acgaggacag catcctgggc 1560gagctcaacg ggcccctgcg ggaggagatc gtcaacttca actgccggaa gctggtggcc 1620tccatgccgc tgttcgccaa cgccgacccc aacttcgtca cggccatgct gaccaagctc 1680aagttcgagg tcttccagcc gggtgactac atcatccgcg aaggcaccat cgggaagaag 1740atgtacttca tccagcacgg cgtggtcagc gtgctcacta agggcaacaa ggagatgaag 1800ctgtccgatg gctcctactt cggggagatc tgcctgctca cccggggccg ccgcacggcg 1860agcgtgcggg ccgacaccta ctgccgcctc tattcgctga gcgtggacaa cttcaacgag 1920gtgctggagg agtaccccat gatgcggcgc gccttcgaga cggtggccat cgaccgcctg 1980gaccgcatcg gcaagaagaa ttccatcctc ctgcacaagg tgcagcatga cctcaactcg 2040ggcgtattca acaaccagga gaacgccatc atccaggaga tcgtcaagta cgaccgcgag 2100atggtgcagc aggccgagct gggtcagcgc gtgggcctct tcccgccgcc gccgccgccg 2160271812DNAHomo Sapiensgene(1)..(1812)hyperpolarization-activated, cyclic nucleotide-gated potassium channel 3 (HCN3) (partial coding sequence) 27atggaggcag agcagcggcc ggcggcgggg gccagcgaag gggcgacccc tggactggag 60gcggtgcctc ccgttgctcc cccgcctgcg accgcggcct caggtccgat ccccaaatct 120gggcctgagc ctaagaggag gcaccttggg acgctgctcc agcctacggt caacaagttc 180tcccttcggg tgttcggcag ccacaaagca gtggaaatcg agcaggagcg ggtgaagtca 240gcgggggcct ggatcatcca cccctacagc gacttccggt tttactggga cctgatcatg 300ctgctgctga tggtggggaa cctcatcgtc ctgcctgtgg gcatcacctt cttcaaggag 360gagaactccc cgccttggat cgtcttcaac gtattgtctg atactttctt cctactggat 420ctggtgctca acttccgaac gggcatcgtg gtggaggagg gtgctgagat cctgctggca 480ccgcgggcca tccgcacgcg ctacctgcgc acctggttcc tggttgacct catctcttct 540atccctgtgg attacatctt cctagtggtg gagctggagc cacggttgga cgctgaggtc 600tacaaaacgg cacgggccct acgcatcgtt cgcttcacca agatcctaag cctgctgagg 660ctgctccgcc tctcccgcct catccgctac atacaccagt gggaggagat ctttcacatg 720acctatgacc tggccagtgc tgtggttcgc atcttcaacc tcattgggat gatgctgctg 780ctatgtcact gggatggctg tctgcagttc ctggtgccca tgctgcagga cttccctccc 840gactgctggg tctccatcaa ccacatggtg aaccactcgt ggggccgcca gtattcccat 900gccctgttca aggccatgag ccacatgctg tgcattggct atgggcagca ggcacctgta 960ggcatgcccg acgtctggct caccatgctc agcatgatcg taggtgccac atgctacgcc 1020atgttcatcg gccatgccac ggcactcatc cagtccctgg actcttcccg gcgtcagtac 1080caggagaagt acaagcaggt ggagcagtac atgtccttcc acaagctgcc agcagacacg 1140cggcagcgca tccacgagta ctatgagcac cgctaccagg gcaagatgtt cgatgaggaa 1200agcatcctgg gcgagctgag cgagccgctt cgcgaggaga tcattaactt cacctgtcgg 1260ggcctggtgg cccacatgcc gctgtttgcc catgccgacc ccagcttcgt cactgcagtt 1320ctcaccaagc tgcgctttga ggtcttccag ccgggggatc tcgtggtgcg tgagggctcc 1380gtggggagga agatgtactt catccagcat gggctgctca gtgtgctggc ccgcggcgcc 1440cgggacacac gcctcaccga tggatcctac tttggggaga tctgcctgct aactaggggc 1500cggcgcacag ccagtgttcg ggctgacacc tactgccgcc tttactcact cagcgtggac 1560catttcaatg ctgtgcttga ggagttcccc atgatgcgcc gggcctttga gactgtggcc 1620atggatcggc tgctccgcat cggcaagaag aattccatac tgcagcggaa gcgctccgag 1680ccaagtccag gcagcagtgg tggcatcatg gagcagcact tggtgcaaca tgacagagac 1740atggctcggg gtgttcgggg tcgggccccg agcacaggag ctcagcttag tggaaagcca 1800gtactgtggg ag 1812282214DNAHomo Sapiensgene(1)..(2214)Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 4 (HCN4) (Partial Coding Sequence) 28atggacaagc tgccgccgtc catgcgcaag cggctctaca gcctcccgca gcaggtgggg 60gccaaggcgt ggatcatgga cgaggaagag gacgccgagg aggagggggc cgggggccgc 120caagacccca gccgcaggag catccggctg cggccactgc cctcgccctc cccctcggcg 180gccgcgggtg gcacggagtc ccggagctcg gccctcgggg cagcggacag cgaagggccg 240gcccgcggcg cgggcaagtc cagcacgaac ggcgactgca ggcgcttccg cgggagcctg 300gcctcgctgg gcagccgggg cggcggcagc ggcggcacgg ggagcggcag cagtcacgga 360cacctgcatg actccgcgga ggagcggcgg ctcatcgccg agggcgacgc gtcccccggc 420gaggacagga cgcccccagg cctggcggcc gagcccgagc gccccggcgc ctcggcgcag 480cccgcagcct cgccgccgcc gccccagcag ccaccgcagc cggcctccgc ctcctgcgag 540cagccctcgg tggacaccgc tatcaaagtg gagggaggcg cggctgccgg cgaccagatc 600ctcccggagg ccgaggtgcg cctgggccag gccggcttca tgcagcgcca gttcggggcc 660atgctccaac ccggggtcaa caaattctcc ctaaggatgt tcggcagcca gaaagccgtg 720gagcgcgaac aggagagggt caagtcggcc ggattttgga ttatccaccc ctacagtgac 780ttcagatttt actgggacct gaccatgctg ctgctgatgg tgggaaacct gattatcatt 840cctgtgggca tcaccttctt caaggatgag aacaccacac cctggattgt cttcaatgtg 900gtgtcagaca cattcttcct catcgacttg gtcctcaact tccgcacagg gatcgtggtg 960gaggacaaca cagagatcat cctggacccg cagcggatta aaatgaagta cctgaaaagc 1020tggttcatgg tagatttcat ttcctccatc cccgtggact acatcttcct cattgtggag 1080acacgcatcg actcggaggt ctacaagact gcccgggccc tgcgcattgt ccgcttcacg 1140aagatcctca gcctcttacg cctgttacgc ctctcccgcc tcattcgata tattcaccag 1200tgggaagaga tcttccacat gacctacgac ctggccagcg ccgtggtgcg catcgtgaac 1260ctcatcggca tgatgctcct gctctgccac tgggacggct gcctgcagtt cctggtaccc 1320atgctacagg acttccctga cgactgctgg gtgtccatca acaacatggt gaacaactcc 1380tgggggaagc agtactccta cgcgctcttc aaggccatga gccacatgct gtgcatcggc 1440tacgggcggc aggcgcccgt gggcatgtcc gacgtctggc tcaccatgct cagcatgatc 1500gtgggtgcca cctgctacgc catgttcatt ggccacgcca ctgccctcat ccagtccctg 1560gactcctccc ggcgccagta ccaggaaaag tacaagcagg tggagcagta catgtccttt 1620cacaagctcc cgcccgacac ccggcagcgc atccacgact actacgagca ccgctaccag 1680ggcaagatgt tcgacgagga gagcatcctg ggcgagctaa gcgagcccct gcgggaggag 1740atcatcaact ttaactgtcg gaagctggtg gcctccatgc cactgtttgc caatgcggac 1800cccaacttcg tgacgtccat gctgaccaag ctgcgtttcg aggtcttcca gcctggggac 1860tacatcatcc gggaaggcac cattggcaag aagatgtact tcatccagca tggcgtggtc 1920agcgtgctca ccaagggcaa caaggagacc aagctggccg acggctccta ctttggagag 1980atctgcctgc tgacccgggg ccggcgcaca gccagcgtga gggccgacac ctactgccgc 2040ctctactcgc tgagcgtgga caacttcaat gaggtgctgg aggagtaccc catgatgcga 2100agggccttcg agaccgtggc gctggaccgc ctggaccgca ttggcaagaa gaactccatc 2160ctcctccaca aagtccagca cgacctcaac tccggcgtct tcaactacca ggag 2214292256DNAHomo Sapiensgene(1)..(2256)Homo Sapiens Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 4 (HCN4) partial coding sequence with c-myc partial coding sequence 29cgcctcgcca tggacaagct gccgccgtcc atgcgcaagc ggctctacag cctcccgcag 60caggtggggg ccaaggcgtg gatcatggac gaggaagagg acgccgagga ggagggggcc 120gggggccgcc aagaccccag ccgcaggagc atccggctgc ggccactgcc ctcgccctcc 180ccctcggcgg ccgcgggtgg cacggagtcc cggagctcgg ccctcggggc agcggacagc 240gaagggccgg cccgcggcgc gggcaagtcc agcacgaacg gcgactgcag gcgcttccgc 300gggagcctgg cctcgctggg cagccggggc ggcggcagcg gcggcacggg gagcggcagc 360agtcacggac acctgcatga ctccgcggag gagcggcggc tcatcgccga gggcgacgcg 420tcccccggcg aggacaggac gcccccaggc ctggcggccg agcccgagcg ccccggcgcc 480tcggcgcagc ccgcagcctc gccgccgccg ccccagcagc caccgcagcc ggcctccgcc 540tcctgcgagc agccctcggt ggacaccgct atcaaagtgg agggaggcgc ggctgccggc 600gaccagatcc tcccggaggc cgaggtgcgc ctgggccagg ccggcttcat gcagcgccag 660ttcggggcca tgctccaacc cggggtcaac aaattctccc taaggatgtt cggcagccag 720aaagccgtgg agcgcgaaca ggagagggtc aagtcggccg gattttggat tatccacccc 780tacagtgact tcagatttta ctgggacctg accatgctgc tgctgatggt gggaaacctg 840attatcattc ctgtgggcat caccttcttc aaggatgaga acaccacacc ctggattgtc 900ttcaatgtgg tgtcagacac attcttcctc atcgacttgg tcctcaactt ccgcacaggg 960atcgtggtgg aggacaacac agagatcatc ctggacccgc agcggattaa aatgaagtac 1020ctgaaaagct ggttcatggt agatttcatt tcctccatcc ccgtggacta catcttcctc 1080attgtggaga cacgcatcga ctcggaggtc tacaagactg cccgggccct

gcgcattgtc 1140cgcttcacga agatcctcag cctcttacgc ctgttacgcc tctcccgcct cattcgatat 1200attcaccagt gggaagagat cttccacatg acctacgacc tggccagcgc cgtggtgcgc 1260atcgtgaacc tcatcggcat gatgctcctg ctctgccact gggacggctg cctgcagttc 1320ctggtaccca tgctacagga cttccctgac gactgctggg tgtccatcaa caacatggtg 1380aacaactcct gggggaagca gtactcctac gcgctcttca aggccatgag ccacatgctg 1440tgcatcggct acgggcggca ggcgcccgtg ggcatgtccg acgtctggct caccatgctc 1500agcatgatcg tgggtgccac ctgctacgcc atgttcattg gccacgccac tgccctcatc 1560cagtccctgg actcctcccg gcgccagtac caggaaaagt acaagcaggt ggagcagtac 1620atgtcctttc acaagctccc gcccgacacc cggcagcgca tccacgacta ctacgagcac 1680cgctaccagg gcaagatgtt cgacgaggag agcatcctgg gcgagctaag cgagcccctg 1740cgggaggaga tcatcaactt taactgtcgg aagctggtgg cctccatgcc actgtttgcc 1800aatgcggacc ccaacttcgt gacgtccatg ctgaccaagc tgcgtttcga ggtcttccag 1860cctggggact acatcatccg ggaaggcacc attggcaaga agatgtactt catccagcat 1920ggcgtggtca gcgtgctcac caagggcaac aaggagacca agctggccga cggctcctac 1980tttggagaga tctgcctgct gacccggggc cggcgcacag ccagcgtgag ggccgacacc 2040tactgccgcc tctactcgct gagcgtggac aacttcaatg aggtgctgga ggagtacccc 2100atgatgcgaa gggccttcga gaccgtggcg ctggaccgcc tggaccgcat tggcaagaag 2160aactccatcc tcctccacaa agtccagcac gacctcaact ccggcgtctt caactaccag 2220gagcagaagc tgatctcaga ggaggacctg ctttga 2256

Claims

1-23. (canceled)

24. A nucleic acid construct comprising: a heterologous regulatory sequence operably linked to a nucleotide sequence encoding a truncated human hyperpolarization-activated cyclic nucleotide-gated 4 (HCN4) protein, wherein the truncated human HCN4 protein is a truncated version of an un-truncated wild-type human HNC4 protein that encodes a cyclic nucleotide binding domain (CNBD) and is truncated 16 amino acids after the coding sequence of the CNBD, and wherein expression of the human HCN4 truncated polynucleotide in an isolated cell results in a channel responsive to cyclic adenosine monophosphate (cAMP) over a broader range of potentials than the un-truncated wild-type human HCN4 protein.

25. An isolated purified cell comprising the construct of claim 24, wherein expression of the human HCN4 truncated polynucleotide in the cell results in a channel responsive to cAMP over a broader range of potentials than the un-truncated wild-type human HCN4 protein.

26. A pharmaceutical composition comprising the cell of claim 25 and a pharmaceutically acceptable carrier.

27. A method comprising administering the pharmaceutical composition of claim 25 to a patient in need thereof.

28. The method of claim 27, wherein the patient is suffering from a cardiac dysfunction.

29. The method of claim 28, wherein the cardiac dysfunction is arrhythmia.

30. The method of claim 28, wherein the cardiac dysfunction is bradyarrhythmia.

31. The method of claim 28, wherein the cardiac dysfunction is tachyarrhythmia.

32. A pharmaceutical composition comprising the construct of claim 24 and a pharmaceutically acceptable carrier.

33. The pharmaceutical composition of claim 32, further comprising a nucleic acid construct comprising a heterologous regulatory sequence operably linked to a nucleotide sequence encoding a protein selected from the group consisting of human hyperpolarization-activated cyclic nucleotide-gated 1 (HCN1) protein, human hyperpolarization-activated cyclic nucleotide-gated 2 (HCN2) protein, and human hyperpolarization-activated cyclic nucleotide-gated 3 (HCN3).

34. The pharmaceutical composition of claim 33, further comprising a nucleic acid construct comprising a heterologous regulatory sequence operably linked to a nucleotide sequence encoding a protein selected from the group consisting of beta-1 adrenergic receptor, beta-2 adrenergic receptor, T-type calcium channel (CACNA1H, I.sub.ca,T), human L-type calcium channel (CACNA1C, I.sub.ca,L), mink-related peptide 1 (KCNE2-beta, MiRP1, HCN-beta subunit), voltage-gated channel (KCNE2, I.sub.Kr), cholinergic receptor, acetylcholine-activated K+ channel (KCNJ3, KCNJ4, I.sub.K(Ach)), muscarinic 2 receptor (CHRM2), muscarinic 3 receptor (CHRM3), inwardly-rectifying K+ channel (KCNJ2, I.sub.K1), transient outward K+ channel voltage-gated channel (KCND3, T.sub.t0 and Kv channel interacting proteins 2 (KchIP2.x).

35. The pharmaceutical composition of claim 32, further comprising a nucleic acid construct comprising a heterologous regulatory sequence operably linked to a nucleotide sequence encoding a protein selected from the group consisting of beta-1 adrenergic receptor, beta-2 adrenergic receptor, T-type calcium channel (CACNA1H, I.sub.ca,T), human L-type calcium channel (CACNA1C, I.sub.ca,L), mink-related peptide 1 (KCNE2-beta, MiRP1, HCN-beta subunit), voltage-gated channel (KCNE2, I.sub.Kr), cholinergic receptor, acetylcholine-activated K+ channel (KCNJ3, KCNJ4, I.sub.K(Ach)), muscarinic 2 receptor (CHRM2), muscarinic 3 receptor (CHRM3), inwardly-rectifying K+ channel (KCNJ2, I.sub.K1), transient outward K+ channel voltage-gated channel (KCND3, T.sub.t0) and Kv channel interacting proteins 2 (KchIP2.x).

36. A method comprising administering the pharmaceutical composition of claim 32 to a patient in need thereof.

37. The method of claim 36, wherein the patient is suffering from a cardiac dysfunction.

38. The method of claim 37, wherein the cardiac dysfunction is arrhythmia.

39. The method of claim 37, wherein the cardiac dysfunction is bradyarrhythmia.

40. The method of claim 37, wherein the cardiac dysfunction is tachyarrhythmia.