{"gene":"KCNAB1","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":1996,"finding":"KCNAB1 (encoding Kvβ1) encodes at least three splice variants (hKvβ1.1, hKvβ1.2, hKvβ1.3) from a gene >250 kb with 14 exons. Co-expression of hKvβ1.1 and hKvβ1.2 with hKv1.5 α-subunits confers rapid inactivation on otherwise non-inactivating Kv1.5 channels, with different potencies attributed to differences in their amino-terminal inactivating domains. The amino-terminal inactivating domains of Kvβ1.1 and Kv1.4α compete for the same receptor site(s) on Kv1α subunits.","method":"Heterologous co-expression in 293 cells, patch-clamp electrophysiology, Northern blot, gene structure analysis","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 1 — direct functional reconstitution with electrophysiology and domain competition assay","pmids":["8938711"],"is_preprint":false},{"year":1996,"finding":"KCNAB1 (Kvβ1.1 gene) was localized to human chromosome 3q26.1 by somatic cell hybrid mapping and FISH, and confirmed by PCR screening of the CEPH YAC library.","method":"Somatic cell hybrid mapping, fluorescence in situ hybridization (FISH), YAC library PCR screening","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal cytogenetic methods confirming chromosomal localization","pmids":["8838324"],"is_preprint":false},{"year":1998,"finding":"Cloning of the human Kvβ3.1 subunit (KCNA3B gene, distinct from KCNAB1) demonstrated that co-expression of Kvβ3.1 with Kv1.5 in CHO cells yields a novel A-type (very fast inactivating) outward K+ current, extending the repertoire of A-type Kv channels in the human brain. This paper also clarifies that the three Kvβ genes (KCNA1B/KCNAB1, KCNA2B, KCNA3B) share similar exon patterns despite very disparate gene lengths.","method":"cDNA cloning, heterologous co-expression in CHO cells, patch-clamp electrophysiology, Northern blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — functional reconstitution in CHO cells with electrophysiology; provides structural context for KCNAB1 gene family","pmids":["9857044"],"is_preprint":false},{"year":2003,"finding":"Kvβ1.3 (AKR6A3, encoded by KCNAB1) is an aldo-keto reductase superfamily member that binds pyridine nucleotide cofactors (NADP(H)/NAD+). When co-expressed with Kv1.5 in COS-7 cells, Kvβ1.3 translocates from cytoplasm to the membrane, indicating high-affinity binding to Kvα. The resulting channels display pronounced inactivation. Inclusion of NAD+ (1 mM) in the patch pipette abolished Kvβ-induced inactivation of Kv1.5 currents, whereas NADPH (0.1 mM) did not, demonstrating that the NADPH-bound (but not NAD+-bound) conformation of Kvβ imparts inactivation. This establishes a redox-sensing mechanism by which the cellular NAD+/NADPH ratio regulates K+ channel inactivation and membrane excitability.","method":"Transient transfection of COS-7 cells, patch-clamp electrophysiology with intracellular nucleotide perfusion, subcellular fractionation/localization","journal":"Chemico-biological interactions","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with pharmacological manipulation and electrophysiological readout; mechanistic nucleotide-state control demonstrated directly","pmids":["12604247"],"is_preprint":false},{"year":2016,"finding":"Genetic ablation of the Kvβ1.1 isoform (KCNAB1 isoform 1) in female mice caused cardiac hypertrophy with prolonged monophasic action potentials, elevated blood pressure, and increased myosin heavy chain α (MHCα) expression. Male knockouts showed only electrical changes (prolonged QTc and APD) without hypertrophy. Kvβ1.1 was shown to bind MHCα at the protein level, and siRNA-mediated knockdown of Kvβ1.1 in H9C2 cells upregulated MHCα, establishing a direct link between Kvβ1.1 and sarcomeric gene regulation.","method":"KCNAB1 knockout mouse model, ECG, monophasic action potential recordings, echocardiography, western blot, siRNA knockdown in H9C2 cells","journal":"Experimental physiology","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with defined cardiac phenotype plus protein interaction and siRNA validation in cells","pmids":["27038296"],"is_preprint":false},{"year":2017,"finding":"In murine coronary arterial myocytes, KVβ1 (KCNAB1 product, AKR6A3) and KVβ2 form heteromeric complexes with each other and with the pore subunit KV1.5, as detected by proximity ligation assay and co-immunoprecipitation. Confocal microscopy and membrane fractionation of KVβ2-null myocytes showed reduced sarcolemmal KV1.5, indicating that the KVβ1/KVβ2 heteromeric complex facilitates KV1.5 trafficking and membrane localization.","method":"In situ proximity ligation assay, real-time qPCR, Western blot, confocal microscopy, membrane fractionation in KVβ2-null mice","journal":"Chemico-biological interactions","confidence":"High","confidence_rationale":"Tier 2 — reciprocal protein interaction assays combined with KO localization studies using multiple orthogonal methods","pmids":["28342889"],"is_preprint":false},{"year":2019,"finding":"Kcnab1 is expressed specifically in subplate (L6b/SP) neurons of the mouse cerebral cortex beginning at embryonic day 14.5. Retrograde tracing combined with in situ hybridization demonstrated that Kcnab1-expressing L6b/SP neurons project unilaterally (ipsilaterally) to the primary motor cortex but do not project callosally, identifying Kcnab1 as a marker and functional correlate of a specific unilaterally-projecting neuronal subpopulation. Among splice variants, variant 1.1 accounted for all cortical expression.","method":"Retrograde axonal tracing, in situ hybridization, microarray, immunostaining, embryonic staging","journal":"Frontiers in neuroanatomy","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by ISH + retrograde tracing with functional projection identity, single lab","pmids":["31130851"],"is_preprint":false},{"year":2012,"finding":"KCNAB1 mRNA (encoding Kvβ1) is expressed in a broad population of cortical neurons in the human prefrontal cortex, significantly larger than the parvalbumin (PV) or somatostatin (SST) interneuron populations, as determined by dual-label in situ hybridization. This contrasts with KCNS3, which is selectively expressed in PV neurons, establishing that KCNAB1 is not a selective marker for GABAergic interneuron subtypes.","method":"Dual-label in situ hybridization with 35S- and digoxigenin-labeled riboprobes in human prefrontal cortex","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — direct cell-type localization by ISH in human tissue, single lab","pmids":["22937123"],"is_preprint":false}],"current_model":"KCNAB1 encodes the voltage-gated K+ channel auxiliary β1 subunit (Kvβ1), an aldo-keto reductase superfamily member that physically associates with Kv1-family α-subunits (notably Kv1.5) at the plasma membrane, confers rapid (N-type ball-and-chain) inactivation on otherwise non-inactivating channels, and acts as a redox sensor whereby NADPH binding promotes inactivation while NAD+ binding abolishes it, thereby coupling the cellular redox state to membrane excitability; in vivo, Kvβ1.1 (the isoform encoded by KCNAB1) is required for normal cardiac electrical activity and, in females, for prevention of cardiac hypertrophy, and it forms heteromeric complexes with Kvβ2 that facilitate sarcolemmal trafficking of KV1.5 in vascular smooth muscle."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing that KCNAB1 encodes multiple splice variants whose distinct N-terminal domains confer graded inactivation on Kv1.5 channels resolved how a single auxiliary gene diversifies Kv1 channel gating behavior.","evidence":"Co-expression of Kvβ1 splice variants with Kv1.5 in HEK293 cells, patch-clamp electrophysiology, and ball-peptide competition assays","pmids":["8938711"],"confidence":"High","gaps":["Relative abundance and tissue-specific expression of each splice variant not established","No structural basis for how different N-termini achieve different inactivation potencies"]},{"year":2003,"claim":"Demonstrating that the pyridine nucleotide oxidation state controls Kvβ1-mediated inactivation (NADPH promotes it, NAD⁺ abolishes it) established Kvβ1 as a metabolic redox sensor coupling cellular energetics to K⁺ channel gating.","evidence":"Patch-clamp electrophysiology in COS-7 cells with intracellular nucleotide perfusion; subcellular fractionation showing membrane translocation upon α-subunit co-expression","pmids":["12604247"],"confidence":"High","gaps":["No crystal structure of the NADPH- vs NAD⁺-bound Kvβ1 conformations to explain the gating switch","Whether the aldo-keto reductase enzymatic activity itself is physiologically relevant remains unclear","In vivo demonstration that endogenous redox changes toggle Kvβ1-dependent inactivation not provided"]},{"year":2012,"claim":"Showing broad cortical neuronal expression of KCNAB1 in human prefrontal cortex — far exceeding parvalbumin or somatostatin interneuron populations — defined it as a pan-neuronal modulator rather than an interneuron-selective channel component.","evidence":"Dual-label in situ hybridization in human prefrontal cortex tissue","pmids":["22937123"],"confidence":"Medium","gaps":["No functional consequence of KCNAB1 in cortical neurons was tested","Single-lab observation in human tissue without independent replication"]},{"year":2016,"claim":"Knockout of Kvβ1.1 in mice revealed that it is required for normal cardiac repolarization and, in females, for prevention of cardiac hypertrophy, establishing an unexpected sex-specific in vivo role beyond channel gating.","evidence":"KCNAB1 KO mice with ECG, monophasic action potential recording, echocardiography; siRNA knockdown in H9C2 cells showing MHCα upregulation; Kvβ1.1–MHCα co-immunoprecipitation","pmids":["27038296"],"confidence":"High","gaps":["Mechanism of sex specificity for hypertrophy phenotype not elucidated","Kvβ1.1–MHCα interaction shown by co-IP only; functional significance of the physical interaction with a sarcomeric protein is unclear","Whether the redox-sensing function contributes to the cardiac phenotype was not tested"]},{"year":2017,"claim":"Demonstrating that Kvβ1 and Kvβ2 form heteromeric complexes that together facilitate sarcolemmal trafficking of Kv1.5 in coronary arterial myocytes revealed a chaperone-like trafficking function beyond inactivation gating.","evidence":"Proximity ligation assay, co-immunoprecipitation, confocal microscopy, and membrane fractionation in wild-type and Kvβ2-null murine coronary arterial myocytes","pmids":["28342889"],"confidence":"High","gaps":["Whether Kvβ1 alone can traffic Kv1.5 independently of Kvβ2 is unknown","Stoichiometry of the Kvβ1/Kvβ2 heteromeric complex not determined"]},{"year":2019,"claim":"Identification of Kcnab1 as a selective marker for ipsilaterally-projecting subplate (L6b) neurons in mouse cortex linked the subunit to a specific circuit identity, suggesting a role in shaping excitability of a defined cortical projection class.","evidence":"Retrograde axonal tracing combined with in situ hybridization and embryonic staging in mouse cerebral cortex","pmids":["31130851"],"confidence":"Medium","gaps":["No functional electrophysiology of Kvβ1 in subplate neurons performed","Whether Kvβ1 expression is instructive for projection identity or merely correlative is unknown"]},{"year":null,"claim":"How the redox-sensing and trafficking functions of Kvβ1 integrate in vivo — particularly whether metabolic shifts toggle channel inactivation to produce the observed cardiac and vascular phenotypes — remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No in vivo demonstration that physiological redox changes alter Kvβ1-dependent channel gating","Structural basis for nucleotide-dependent conformational switching not available","Mechanism linking Kvβ1.1 to sarcomeric gene regulation (MHCα) not determined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,6,7]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[5]}],"complexes":["Kv1.5/Kvβ1 channel complex","Kvβ1/Kvβ2 heteromeric complex"],"partners":["KCNA5","KCNAB2","MYH6"],"other_free_text":[]},"mechanistic_narrative":"KCNAB1 encodes the voltage-gated potassium channel β1 subunit (Kvβ1), an aldo-keto reductase superfamily member that physically associates with Kv1-family α-subunits to confer rapid N-type inactivation on otherwise non-inactivating channels and to regulate their surface trafficking. Multiple splice variants (Kvβ1.1, Kvβ1.2, Kvβ1.3) share a conserved core but differ in amino-terminal inactivation domains that compete with the Kv1.4α ball peptide for the same receptor site on the α-subunit pore, thereby determining inactivation kinetics [PMID:8938711]. Kvβ1 functions as a redox sensor: the NADPH-bound conformation promotes channel inactivation, whereas NAD+ binding abolishes it, coupling the cellular NAD⁺/NADPH ratio to membrane excitability [PMID:12604247]. In vivo, Kvβ1.1 knockout in mice prolongs cardiac action potentials and causes sex-dependent cardiac hypertrophy with upregulation of MHCα, and Kvβ1 forms heteromeric complexes with Kvβ2 that facilitate sarcolemmal trafficking of Kv1.5 in vascular smooth muscle [PMID:27038296, PMID:28342889]."},"prefetch_data":{"uniprot":{"accession":"Q14722","full_name":"Voltage-gated potassium channel subunit beta-1","aliases":["K(+) channel subunit beta-1","Kv-beta-1"],"length_aa":419,"mass_kda":46.6,"function":"Regulatory subunit of the voltage-gated potassium (Kv) Shaker channels composed of pore-forming and potassium-conducting alpha subunits and of regulatory beta subunits (PubMed:17156368, PubMed:17540341, PubMed:19713757, PubMed:7499366, PubMed:7603988). The beta-1/KCNAB1 cytoplasmic subunit mediates closure of delayed rectifier potassium channels by physically obstructing the pore via its N-terminal domain and increases the speed of channel closure for other family members (PubMed:9763623). Promotes the inactivation of Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.4/KCNA4, Kv1.5/KCNA5 and Kv1.6/KCNA6 alpha subunit-containing channels (PubMed:12077175, PubMed:12130714, PubMed:15361858, PubMed:17156368, PubMed:17540341, PubMed:19713757, PubMed:7499366, PubMed:7603988, PubMed:7649300, PubMed:7890764, PubMed:9763623). Displays nicotinamide adenine dinucleotide phosphate (NADPH)-dependent aldoketoreductase activity by catalyzing the NADPH-dependent reduction of a variety of endogenous aldehydes and ketones (By similarity). The binding of NADPH is required for efficient down-regulation of potassium channel activity (PubMed:17540341). Oxidation of the bound NADPH restrains N-terminal domain from blocking the channel, thereby decreasing N-type inactivation of potassium channel activity (By similarity) Isoform KvB1.2 shows no effect on KCNA1, KCNA2 or KCNB1","subcellular_location":"Cytoplasm; Membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q14722/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNAB1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNAB1","total_profiled":1310},"omim":[{"mim_id":"615697","title":"EPILEPSY, FAMILIAL TEMPORAL LOBE, 6; ETL6","url":"https://www.omim.org/entry/615697"},{"mim_id":"604619","title":"LEUCINE-RICH GENE, GLIOMA-INACTIVATED, 1; LGI1","url":"https://www.omim.org/entry/604619"},{"mim_id":"601141","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SHAKER-RELATED SUBFAMILY, BETA MEMBER 1; KCNAB1","url":"https://www.omim.org/entry/601141"},{"mim_id":"601014","title":"DISCS LARGE MAGUK SCAFFOLD PROTEIN 1; DLG1","url":"https://www.omim.org/entry/601014"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"blood vessel","ntpm":91.5},{"tissue":"brain","ntpm":61.2}],"url":"https://www.proteinatlas.org/search/KCNAB1"},"hgnc":{"alias_symbol":["AKR6A3","KCNA1B","hKvBeta3","Kvb1.3","hKvb3"],"prev_symbol":[]},"alphafold":{"accession":"Q14722","domains":[{"cath_id":"3.20.20.100","chopping":"80-305_368-380","consensus_level":"high","plddt":97.1729,"start":80,"end":380}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14722","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14722-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14722-F1-predicted_aligned_error_v6.png","plddt_mean":86.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNAB1","jax_strain_url":"https://www.jax.org/strain/search?query=KCNAB1"},"sequence":{"accession":"Q14722","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14722.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14722/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14722"}},"corpus_meta":[{"pmid":"26544041","id":"PMC_26544041","title":"Gene Mutation Analysis in 253 Chinese Children with Unexplained Epilepsy and Intellectual/Developmental Disabilities.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26544041","citation_count":75,"is_preprint":false},{"pmid":"28431800","id":"PMC_28431800","title":"Genetic predictors of antipsychotic response to lurasidone identified in a genome wide association study and by schizophrenia risk genes.","date":"2017","source":"Schizophrenia research","url":"https://pubmed.ncbi.nlm.nih.gov/28431800","citation_count":65,"is_preprint":false},{"pmid":"9857044","id":"PMC_9857044","title":"Coexpression of the KCNA3B gene product with Kv1.5 leads to a novel A-type potassium channel.","date":"1998","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9857044","citation_count":60,"is_preprint":false},{"pmid":"16815889","id":"PMC_16815889","title":"Bone morphogenetic protein-2 upregulates expression and function of voltage-gated K+ channels in human pulmonary artery smooth muscle cells.","date":"2006","source":"American journal of physiology. 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Co-expression of hKvβ1.1 and hKvβ1.2 with hKv1.5 α-subunits confers rapid inactivation on otherwise non-inactivating Kv1.5 channels, with different potencies attributed to differences in their amino-terminal inactivating domains. The amino-terminal inactivating domains of Kvβ1.1 and Kv1.4α compete for the same receptor site(s) on Kv1α subunits.\",\n      \"method\": \"Heterologous co-expression in 293 cells, patch-clamp electrophysiology, Northern blot, gene structure analysis\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct functional reconstitution with electrophysiology and domain competition assay\",\n      \"pmids\": [\"8938711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"KCNAB1 (Kvβ1.1 gene) was localized to human chromosome 3q26.1 by somatic cell hybrid mapping and FISH, and confirmed by PCR screening of the CEPH YAC library.\",\n      \"method\": \"Somatic cell hybrid mapping, fluorescence in situ hybridization (FISH), YAC library PCR screening\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal cytogenetic methods confirming chromosomal localization\",\n      \"pmids\": [\"8838324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Cloning of the human Kvβ3.1 subunit (KCNA3B gene, distinct from KCNAB1) demonstrated that co-expression of Kvβ3.1 with Kv1.5 in CHO cells yields a novel A-type (very fast inactivating) outward K+ current, extending the repertoire of A-type Kv channels in the human brain. This paper also clarifies that the three Kvβ genes (KCNA1B/KCNAB1, KCNA2B, KCNA3B) share similar exon patterns despite very disparate gene lengths.\",\n      \"method\": \"cDNA cloning, heterologous co-expression in CHO cells, patch-clamp electrophysiology, Northern blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional reconstitution in CHO cells with electrophysiology; provides structural context for KCNAB1 gene family\",\n      \"pmids\": [\"9857044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Kvβ1.3 (AKR6A3, encoded by KCNAB1) is an aldo-keto reductase superfamily member that binds pyridine nucleotide cofactors (NADP(H)/NAD+). When co-expressed with Kv1.5 in COS-7 cells, Kvβ1.3 translocates from cytoplasm to the membrane, indicating high-affinity binding to Kvα. The resulting channels display pronounced inactivation. Inclusion of NAD+ (1 mM) in the patch pipette abolished Kvβ-induced inactivation of Kv1.5 currents, whereas NADPH (0.1 mM) did not, demonstrating that the NADPH-bound (but not NAD+-bound) conformation of Kvβ imparts inactivation. This establishes a redox-sensing mechanism by which the cellular NAD+/NADPH ratio regulates K+ channel inactivation and membrane excitability.\",\n      \"method\": \"Transient transfection of COS-7 cells, patch-clamp electrophysiology with intracellular nucleotide perfusion, subcellular fractionation/localization\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with pharmacological manipulation and electrophysiological readout; mechanistic nucleotide-state control demonstrated directly\",\n      \"pmids\": [\"12604247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic ablation of the Kvβ1.1 isoform (KCNAB1 isoform 1) in female mice caused cardiac hypertrophy with prolonged monophasic action potentials, elevated blood pressure, and increased myosin heavy chain α (MHCα) expression. Male knockouts showed only electrical changes (prolonged QTc and APD) without hypertrophy. Kvβ1.1 was shown to bind MHCα at the protein level, and siRNA-mediated knockdown of Kvβ1.1 in H9C2 cells upregulated MHCα, establishing a direct link between Kvβ1.1 and sarcomeric gene regulation.\",\n      \"method\": \"KCNAB1 knockout mouse model, ECG, monophasic action potential recordings, echocardiography, western blot, siRNA knockdown in H9C2 cells\",\n      \"journal\": \"Experimental physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with defined cardiac phenotype plus protein interaction and siRNA validation in cells\",\n      \"pmids\": [\"27038296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In murine coronary arterial myocytes, KVβ1 (KCNAB1 product, AKR6A3) and KVβ2 form heteromeric complexes with each other and with the pore subunit KV1.5, as detected by proximity ligation assay and co-immunoprecipitation. Confocal microscopy and membrane fractionation of KVβ2-null myocytes showed reduced sarcolemmal KV1.5, indicating that the KVβ1/KVβ2 heteromeric complex facilitates KV1.5 trafficking and membrane localization.\",\n      \"method\": \"In situ proximity ligation assay, real-time qPCR, Western blot, confocal microscopy, membrane fractionation in KVβ2-null mice\",\n      \"journal\": \"Chemico-biological interactions\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal protein interaction assays combined with KO localization studies using multiple orthogonal methods\",\n      \"pmids\": [\"28342889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Kcnab1 is expressed specifically in subplate (L6b/SP) neurons of the mouse cerebral cortex beginning at embryonic day 14.5. Retrograde tracing combined with in situ hybridization demonstrated that Kcnab1-expressing L6b/SP neurons project unilaterally (ipsilaterally) to the primary motor cortex but do not project callosally, identifying Kcnab1 as a marker and functional correlate of a specific unilaterally-projecting neuronal subpopulation. Among splice variants, variant 1.1 accounted for all cortical expression.\",\n      \"method\": \"Retrograde axonal tracing, in situ hybridization, microarray, immunostaining, embryonic staging\",\n      \"journal\": \"Frontiers in neuroanatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by ISH + retrograde tracing with functional projection identity, single lab\",\n      \"pmids\": [\"31130851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KCNAB1 mRNA (encoding Kvβ1) is expressed in a broad population of cortical neurons in the human prefrontal cortex, significantly larger than the parvalbumin (PV) or somatostatin (SST) interneuron populations, as determined by dual-label in situ hybridization. This contrasts with KCNS3, which is selectively expressed in PV neurons, establishing that KCNAB1 is not a selective marker for GABAergic interneuron subtypes.\",\n      \"method\": \"Dual-label in situ hybridization with 35S- and digoxigenin-labeled riboprobes in human prefrontal cortex\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct cell-type localization by ISH in human tissue, single lab\",\n      \"pmids\": [\"22937123\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KCNAB1 encodes the voltage-gated K+ channel auxiliary β1 subunit (Kvβ1), an aldo-keto reductase superfamily member that physically associates with Kv1-family α-subunits (notably Kv1.5) at the plasma membrane, confers rapid (N-type ball-and-chain) inactivation on otherwise non-inactivating channels, and acts as a redox sensor whereby NADPH binding promotes inactivation while NAD+ binding abolishes it, thereby coupling the cellular redox state to membrane excitability; in vivo, Kvβ1.1 (the isoform encoded by KCNAB1) is required for normal cardiac electrical activity and, in females, for prevention of cardiac hypertrophy, and it forms heteromeric complexes with Kvβ2 that facilitate sarcolemmal trafficking of KV1.5 in vascular smooth muscle.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KCNAB1 encodes the voltage-gated potassium channel β1 subunit (Kvβ1), an aldo-keto reductase superfamily member that physically associates with Kv1-family α-subunits to confer rapid N-type inactivation on otherwise non-inactivating channels and to regulate their surface trafficking. Multiple splice variants (Kvβ1.1, Kvβ1.2, Kvβ1.3) share a conserved core but differ in amino-terminal inactivation domains that compete with the Kv1.4α ball peptide for the same receptor site on the α-subunit pore, thereby determining inactivation kinetics [PMID:8938711]. Kvβ1 functions as a redox sensor: the NADPH-bound conformation promotes channel inactivation, whereas NAD+ binding abolishes it, coupling the cellular NAD⁺/NADPH ratio to membrane excitability [PMID:12604247]. In vivo, Kvβ1.1 knockout in mice prolongs cardiac action potentials and causes sex-dependent cardiac hypertrophy with upregulation of MHCα, and Kvβ1 forms heteromeric complexes with Kvβ2 that facilitate sarcolemmal trafficking of Kv1.5 in vascular smooth muscle [PMID:27038296, PMID:28342889].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing that KCNAB1 encodes multiple splice variants whose distinct N-terminal domains confer graded inactivation on Kv1.5 channels resolved how a single auxiliary gene diversifies Kv1 channel gating behavior.\",\n      \"evidence\": \"Co-expression of Kvβ1 splice variants with Kv1.5 in HEK293 cells, patch-clamp electrophysiology, and ball-peptide competition assays\",\n      \"pmids\": [\"8938711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative abundance and tissue-specific expression of each splice variant not established\",\n        \"No structural basis for how different N-termini achieve different inactivation potencies\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that the pyridine nucleotide oxidation state controls Kvβ1-mediated inactivation (NADPH promotes it, NAD⁺ abolishes it) established Kvβ1 as a metabolic redox sensor coupling cellular energetics to K⁺ channel gating.\",\n      \"evidence\": \"Patch-clamp electrophysiology in COS-7 cells with intracellular nucleotide perfusion; subcellular fractionation showing membrane translocation upon α-subunit co-expression\",\n      \"pmids\": [\"12604247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal structure of the NADPH- vs NAD⁺-bound Kvβ1 conformations to explain the gating switch\",\n        \"Whether the aldo-keto reductase enzymatic activity itself is physiologically relevant remains unclear\",\n        \"In vivo demonstration that endogenous redox changes toggle Kvβ1-dependent inactivation not provided\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing broad cortical neuronal expression of KCNAB1 in human prefrontal cortex — far exceeding parvalbumin or somatostatin interneuron populations — defined it as a pan-neuronal modulator rather than an interneuron-selective channel component.\",\n      \"evidence\": \"Dual-label in situ hybridization in human prefrontal cortex tissue\",\n      \"pmids\": [\"22937123\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional consequence of KCNAB1 in cortical neurons was tested\",\n        \"Single-lab observation in human tissue without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Knockout of Kvβ1.1 in mice revealed that it is required for normal cardiac repolarization and, in females, for prevention of cardiac hypertrophy, establishing an unexpected sex-specific in vivo role beyond channel gating.\",\n      \"evidence\": \"KCNAB1 KO mice with ECG, monophasic action potential recording, echocardiography; siRNA knockdown in H9C2 cells showing MHCα upregulation; Kvβ1.1–MHCα co-immunoprecipitation\",\n      \"pmids\": [\"27038296\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism of sex specificity for hypertrophy phenotype not elucidated\",\n        \"Kvβ1.1–MHCα interaction shown by co-IP only; functional significance of the physical interaction with a sarcomeric protein is unclear\",\n        \"Whether the redox-sensing function contributes to the cardiac phenotype was not tested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating that Kvβ1 and Kvβ2 form heteromeric complexes that together facilitate sarcolemmal trafficking of Kv1.5 in coronary arterial myocytes revealed a chaperone-like trafficking function beyond inactivation gating.\",\n      \"evidence\": \"Proximity ligation assay, co-immunoprecipitation, confocal microscopy, and membrane fractionation in wild-type and Kvβ2-null murine coronary arterial myocytes\",\n      \"pmids\": [\"28342889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Kvβ1 alone can traffic Kv1.5 independently of Kvβ2 is unknown\",\n        \"Stoichiometry of the Kvβ1/Kvβ2 heteromeric complex not determined\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of Kcnab1 as a selective marker for ipsilaterally-projecting subplate (L6b) neurons in mouse cortex linked the subunit to a specific circuit identity, suggesting a role in shaping excitability of a defined cortical projection class.\",\n      \"evidence\": \"Retrograde axonal tracing combined with in situ hybridization and embryonic staging in mouse cerebral cortex\",\n      \"pmids\": [\"31130851\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional electrophysiology of Kvβ1 in subplate neurons performed\",\n        \"Whether Kvβ1 expression is instructive for projection identity or merely correlative is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the redox-sensing and trafficking functions of Kvβ1 integrate in vivo — particularly whether metabolic shifts toggle channel inactivation to produce the observed cardiac and vascular phenotypes — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vivo demonstration that physiological redox changes alter Kvβ1-dependent channel gating\",\n        \"Structural basis for nucleotide-dependent conformational switching not available\",\n        \"Mechanism linking Kvβ1.1 to sarcomeric gene regulation (MHCα) not determined\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 6, 7]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\n      \"Kv1.5/Kvβ1 channel complex\",\n      \"Kvβ1/Kvβ2 heteromeric complex\"\n    ],\n    \"partners\": [\n      \"KCNA5\",\n      \"KCNAB2\",\n      \"MYH6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}