{"gene":"KCNC1","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":1998,"finding":"Kv3.1 channel in mouse MNTB auditory neurons mediates a high-threshold, DTX-insensitive, TEA-sensitive (1 mM) rapidly activating and deactivating potassium current (IHT) that is required for neurons to follow high-frequency (>200 Hz) stimulation; pharmacological block and computer simulation confirmed this role.","method":"Patch-clamp voltage clamp in MNTB neurons, pharmacology (TEA, DTX), in situ hybridization, computer simulation with Kv3.1 kinetics","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, pharmacology, ISH, simulation) replicated across auditory neuron literature","pmids":["9547392"],"is_preprint":false},{"year":1992,"finding":"Kv3.1 encodes the type l (lymphocyte) voltage-gated K+ channel when expressed in Xenopus oocytes, with properties matching the native l-type channel in T lymphocytes; the gene maps to human chromosome 11.","method":"Heterologous expression in Xenopus oocytes, electrophysiology, RT-PCR in T cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — functional reconstitution in oocytes with matched biophysical properties, consistent with multiple independent reports","pmids":["1400413"],"is_preprint":false},{"year":2005,"finding":"The Kv3.1b splice variant is regulated by PKC phosphorylation in auditory brainstem neurons: in a quiet environment Kv3.1b is basally phosphorylated, high-frequency auditory or synaptic stimulation causes rapid dephosphorylation, which increases Kv3.1 current amplitude and facilitates high-frequency spiking.","method":"Immunochemical phosphorylation assay in rat brainstem neurons, computational modeling, patch-clamp recordings","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical phosphorylation detection combined with electrophysiology and computational modeling in native neurons","pmids":["16136041"],"is_preprint":false},{"year":2001,"finding":"Casein kinase 2 (CK2) constitutively phosphorylates Kv3.1, setting its high voltage-threshold of activation; dephosphorylation with alkaline phosphatase shifts activation >20 mV toward more negative potentials and increases whole-cell conductance, an effect mimicked by CK2 inhibitors but not PKC inhibitors.","method":"Patch-clamp whole-cell recording in CK2-inhibitor-treated CHO cells stably expressing Kv3.1 and native MNTB neurons; alkaline phosphatase application; biochemical phosphorylation assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical and electrophysiological approaches combined in transfected cells and native neurons, replicated with pharmacological and enzymatic tools","pmids":["11160386"],"is_preprint":false},{"year":2003,"finding":"A splice variant of Kv3.4 coassembles with Kv3.1 subunits in rat brain fast-spiking neurons; this heterotetrameric assembly enhances spike repolarizing efficiency compared to Kv3.1 homomers, reducing spike duration and enabling higher repetitive firing rates.","method":"Molecular (RT-PCR), electrophysiological, and pharmacological co-expression studies in heterologous systems; co-assembly inferred from native neuron recordings","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (molecular, electrophysiological, pharmacological) across heterologous and native systems","pmids":["12592408"],"is_preprint":false},{"year":2003,"finding":"MiRP2 (MinK-related peptide 2) co-immunoprecipitates with Kv3.1b from rat brain membranes, forming a native complex; MiRP2 reduces Kv3.1b current density and slows activation kinetics.","method":"Native co-immunoprecipitation from rat brain membranes, heterologous co-expression, whole-cell patch-clamp, RNAi knockdown in PC12 cells and hippocampal neurons","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP from native tissue plus functional characterization in multiple cell types","pmids":["12954870"],"is_preprint":false},{"year":2002,"finding":"The two alternatively spliced Kv3.1 isoforms (Kv3.1a and Kv3.1b) have distinct subcellular localizations in neurons: Kv3.1b is targeted to somatodendritic and axonal membranes, while Kv3.1a is targeted predominantly to axonal membranes with little somatic expression; this differential targeting is conferred by their distinct C-terminal splice domains.","method":"Immunohistochemistry with isoform-specific antibodies in mouse brain sections; electron microscopy","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific antibodies confirmed by multiple brain regions and EM, replicated across neuronal populations","pmids":["12091563"],"is_preprint":false},{"year":2011,"finding":"Alternative splicing controls polarized axonal targeting of Kv3.1: the Kv3.1b C-terminal splice domain creates electrostatic repulsion between N/C termini that unmasks an axonal targeting motif, directing Kv3.1b to axons; axonal Kv3.1b (but not dendritic Kv3.1a, despite identical biophysics) increases maximal firing frequency of hippocampal neurons.","method":"Mutagenesis of Kv3.1 termini, expression in cultured hippocampal neurons, patch-clamp recordings, local channel blocker application, computer simulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis + electrophysiology + simulation, multiple orthogonal methods in one study","pmids":["22105078"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of human Kv3.1a channel reveals a unique T1 cytoplasmic tetramerization domain arrangement that interacts with the C-terminal axonal targeting motif and gating machinery; S1/S2 linker-turret interactions stabilize voltage sensor-pore domain interface; S4/S5 linker residues influence gating kinetics; an electrostatic interaction between acidic residues in T1 α6 helix and R449 in S6T helices controls gating.","method":"Cryo-EM structure determination, molecular dynamics simulations, electrophysiology, mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with mutagenesis, MD simulations, and electrophysiological validation in one study","pmids":["35840580"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of human Kv3.1 at 2.6 Å reveals a T1 domain with a well-resolved Zinc site rotated 35° relative to other Kv channels; a positive modulator (Lu AG00563) binds at a novel site between the voltage-sensor domain and channel pore, a region that is a hotspot for disease-causing mutations.","method":"Cryo-EM structure determination of apo and ligand-bound Kv3.1","journal":"PNAS nexus","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structures of both apo and ligand-bound forms","pmids":["36741467"],"is_preprint":false},{"year":1994,"finding":"The P-region (S5-S6 loop) and C-terminal S6 segment both contribute to ion conduction: L401V in the P-region did not alter single-channel conductance or substantially change TEA sensitivity; M430L in S6 produced permeant-ion- and voltage-dependent channel flicker, indicating S6 contributes to the K+ conduction pathway.","method":"Site-directed mutagenesis, single-channel patch-clamp recordings in Xenopus oocytes","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis with single-channel electrophysiology","pmids":["7696467"],"is_preprint":false},{"year":2006,"finding":"N-glycosylation at positions N220 and N229 in the extracellular S1-S2 linker of Kv3.1 influences channel gating: double mutation N220Q/N229Q produced slower activation and a slight positive shift in voltage dependence without preventing plasma membrane trafficking; glycosylation sites were confirmed by PNGase F digestion and tunicamycin treatment.","method":"Site-directed mutagenesis (N220Q, N229Q), PNGase F and endoglycosidase H digestion, tunicamycin treatment, whole-cell patch-clamp, membrane fractionation in Sf9 cells","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with glycosidase treatment and electrophysiology","pmids":["16792699"],"is_preprint":false},{"year":2014,"finding":"The recurrent de novo KCNC1 p.Arg320His mutation causes progressive myoclonus epilepsy (PME/MEAK) through a dominant-negative loss-of-function effect on the Kv3.1 channel, reducing current amplitude when co-expressed with wild-type.","method":"Exome sequencing, functional analysis of mutant channel in heterologous expression system, whole-cell patch-clamp","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional characterization in heterologous system confirmed dominant-negative mechanism, replicated across multiple labs","pmids":["25401298"],"is_preprint":false},{"year":2017,"finding":"The KCNC1 p.R320H mutant Kv3.1 channel causes dominant-negative loss of function by slowing channel activation; at elevated temperatures, wild-type Kv3.1 shows a leftward shift in activation, which could partially compensate for the mutant's loss of function—explaining transient clinical improvement with fever.","method":"Whole-cell patch-clamp of wild-type and R320H mutant channels at normal and elevated temperatures","journal":"Annals of neurology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiology with temperature manipulation confirming mechanism, consistent with dominant-negative loss-of-function","pmids":["28380698"],"is_preprint":false},{"year":2021,"finding":"The Kv3.1b R320H variant (MEAK mutation) in cortical interneurons causes dominant-negative loss of function (slowing activation) and profoundly reduces excitability with inability to support high-frequency firing; additionally impairs neurite development and interneuron viability. No gating pore currents were introduced by R320H.","method":"Expression in cortical interneurons in vitro, patch-clamp, morphological analysis; oocyte recordings","journal":"Epilepsia","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (electrophysiology, morphology, gating current analysis) in two expression systems","pmids":["33735526"],"is_preprint":false},{"year":2019,"finding":"KCNC1 variants beyond p.R320H cause developmental epileptic encephalopathy; p.Ala421Val causes loss of function through reduced whole-cell current without dominant-negative effect; other DEE-associated variants also produce loss of function with reduced whole-cell currents.","method":"Xenopus oocyte expression, automated two-electrode voltage clamp","journal":"Annals of clinical and translational neurology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct functional characterization in standardized oocyte system for multiple variants","pmids":["31353855"],"is_preprint":false},{"year":2022,"finding":"Three de novo KCNC1 variants in the S6 pore region cause gain of K+ channel function via prominent leftward (hyperpolarized) shift in voltage dependence of activation and slowed deactivation; this gain of function is predicted to reduce excitability of Kv3-expressing high-frequency-firing neurons.","method":"Whole-cell voltage clamp electrophysiology of variants in mammalian heterologous expression system","journal":"Annals of clinical and translational neurology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct electrophysiology in heterologous system, single study, limited replication","pmids":["36419348"],"is_preprint":false},{"year":2021,"finding":"The KCNC1 A513V mutation in the cytoplasmic C-terminus produces a channel that is functionally indistinguishable from wild-type in terms of current amplitude but is completely insensitive to PKC-mediated phosphorylation at the nearby S503 site, indicating loss of modulatory regulation rather than loss of channel function.","method":"Biochemical phosphorylation assays and whole-cell patch-clamp electrophysiology in transfected cells","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — combined biochemical phosphorylation assay and electrophysiology demonstrating a specific regulatory defect","pmids":["34232791"],"is_preprint":false},{"year":2023,"finding":"A novel gain-of-function KCNC1 variant V425M produces larger currents, hyperpolarizing shift in activation gating, failure to inactivate, and slower kinetics; fluoxetine blocks both wild-type and V425M channels and produced clinical improvement in the affected patient.","method":"Patch-clamp recordings in transfected CHO cells, clinical pharmacology","journal":"Epilepsia","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct electrophysiology in heterologous system, single study, single variant","pmids":["37203213"],"is_preprint":false},{"year":1999,"finding":"Kv3.1 and Kv3.2 proteins co-immunoprecipitate from pallidal membrane extracts, indicating they form heteromeric channels in parvalbumin-containing globus pallidus neurons; the native Kv3 current in these neurons matches the electrophysiological properties of expressed Kv3.1/Kv3.2.","method":"Co-immunoprecipitation from native pallidal membranes, immunohistochemistry, patch-clamp of dissociated neurons","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP from native tissue confirmed by electrophysiology, two orthogonal methods","pmids":["10482766"],"is_preprint":false},{"year":2006,"finding":"Kv3.1 associates with OSP/claudin-11 in oligodendrocytes; this interaction was identified by yeast two-hybrid and confirmed by co-immunoprecipitation; Kv3.1 accounts for ~50–75% of sustained K+ current in oligodendrocyte precursor cells (OPCs) and is required for OPC proliferation, migration, and axon myelination.","method":"Yeast two-hybrid, co-immunoprecipitation, antibody blockade, Kv3.1 knockout mice, functional assays (proliferation, migration, myelination)","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP, with multiple functional assays and KO mice","pmids":["16624990"],"is_preprint":false},{"year":2003,"finding":"Loss of both Kv3.1 and Kv3.3 in cerebellar granule cells causes broader parallel fiber action potentials and reduces paired-pulse facilitation at parallel fiber-Purkinje cell synapses; normal PPF can be restored by lowering extracellular Ca2+, indicating Kv3.1/Kv3.3 channels limit activity-dependent presynaptic Ca2+ influx.","method":"Kv3.1/Kv3.3 double-knockout mice, electrophysiological recordings of parallel fiber APs and synaptic transmission, extracellular Ca2+ manipulation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-KO with defined synaptic phenotype and rescue experiment using Ca2+ manipulation","pmids":["12930807"],"is_preprint":false},{"year":2009,"finding":"Kv3.1 in deep cerebellar nucleus (DCN) neurons is required for fast action potential repolarization and normal gait patterning; loss of Kcnc1 alleles in Kcnc3-null mice causes progressive spike broadening and deceleration in DCN neurons and increasing gait ataxia; Purkinje-cell-restricted Kv3.3 restoration failed to rescue gait ataxia when all Kcnc1 alleles were also absent.","method":"Genetic epistasis using Kcnc1/Kcnc3 allele combinations in mice; electrophysiological recordings of DCN neurons; behavioral analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — allele-dose epistasis combined with electrophysiology and behavioral outcomes across multiple genotypes","pmids":["20016089"],"is_preprint":false},{"year":1998,"finding":"Kv3.1 channel localizes to spine-like protrusions adjacent to postsynaptic membranes of cochlear nucleus bushy cells; K+ depletion within these confined spine-like structures produces apparent channel inactivation, demonstrating that compartmentalized ionic transients can be generated in spine-like structures.","method":"Electron immunomicroscopy, cell-attached patch-clamp of Kv3.1-transfected CHO cell vesicles mimicking spine geometry","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — EM localization combined with functional reconstitution in defined geometry","pmids":["9465111"],"is_preprint":false},{"year":1998,"finding":"Depolarization and calcium influx selectively increase Kv3.1 mRNA and high-threshold noninactivating K+ current in developing inferior colliculus neurons, an effect blocked by calcium channel blockers; increased Kv3.1-like current causes more rapid and complete action potential repolarization.","method":"Potassium-induced depolarization of inferior colliculus neurons, RT-PCR, voltage-clamp, calcium channel blockers, computer simulation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological dissection with calcium blockers, mRNA quantification, electrophysiology, simulation","pmids":["9786983"],"is_preprint":false},{"year":2011,"finding":"In deep cerebellar nuclear neurons, Kv3.1 channels dominate spike repolarization and enable fast evoked firing; in contrast, BK channels predominantly control spontaneous firing rate; when Kv3.1 is blocked, BK channels gain a compensatory role in repolarization.","method":"Whole-cell patch-clamp in DCN neurons with selective BK and Kv3.1 channel blockers (iberiotoxin, 4-aminopyridine 20 µM)","journal":"Cerebellum","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — selective pharmacology in native neurons, single lab study","pmids":["21750937"],"is_preprint":false},{"year":1998,"finding":"Heterologous expression of Kv3.1 in Aplysia bag cell neurons eliminates frequency-dependent spike broadening by rapid repolarization; this prevents the depolarizing afterpotential that would otherwise trigger prolonged spontaneous firing, demonstrating that spike broadening regulates calcium entry (up to 5-fold increase) which in turn induces long-term changes in excitability.","method":"Heterologous Kv3.1 expression in Aplysia neurons, current-clamp recordings, calcium current integral measurements, BAPTA chelation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — heterologous expression with defined functional readout, multiple orthogonal methods","pmids":["9801357"],"is_preprint":false},{"year":2020,"finding":"U-type inactivation in Kv3.1 requires the second threonine (T400) of the selectivity filter TTVGYG sequence; T400A mutation eliminates U-type inactivation, yielding noninactivating currents, indicating the selectivity filter is allosterically involved in the inactivation gating mechanism.","method":"Site-directed mutagenesis (T400A), whole-cell patch-clamp in hKv3.1 expressed in heterologous cells, variation of extracellular K+ concentration","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis with clear functional readout and ionic manipulation to confirm mechanism","pmids":["32365329"],"is_preprint":false},{"year":2013,"finding":"The polyether toxin gambierol inhibits Kv3.1 by anchoring the voltage-sensing domain (VSD) in the resting/closed state; it acts via a lipid-exposed binding site outside the K+ permeation pathway; the resting channel conformation is the high-affinity state; strong depolarizations allow VSD movement to an activated-not-open state but toxin must dissociate before channel opens; a tetrameric concatemer with only one high-affinity site retains high toxin sensitivity.","method":"Gating current analysis, ionic current analysis, concatemer mutagenesis, whole-cell patch-clamp in heterologous cells","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — gating current analysis combined with concatemer mutagenesis and ionic current recordings","pmids":["23401573"],"is_preprint":false},{"year":2024,"finding":"UBR5 E3 ubiquitin ligase directly binds Kv3.1 and drives its ubiquitin-mediated proteasomal degradation in the spinal cord during inflammatory pain; Kv3.1 protein (but not mRNA) is decreased after CFA injection; a competitive peptide (TP-CH-401) matching the Kv3.1 ubiquitination motif rescues Kv3.1 expression and Kv currents and attenuates pain behaviors.","method":"Co-immunoprecipitation of UBR5-Kv3.1, ubiquitination assays, Kv3.1 KD/KO, intrathecal peptide injection, whole-cell patch-clamp","journal":"Molecular neurobiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding confirmed by co-IP, ubiquitination assay, competitive peptide rescue, electrophysiology","pmids":["38865078"],"is_preprint":false},{"year":2025,"finding":"In OVLT neurons, hypertonicity activates the WNK1→OSR1/SPAK kinase cascade, which in turn increases Kv3.1 channel currents to enhance action potential firing and trigger arginine vasopressin (AVP) release; deletion of Osr1 and Spak in the OVLT blunts hypertonicity-induced AP firing and AVP release, phenocopying Kv3.1 OVLT deletion.","method":"Conditional knockout of Osr1/Spak and Kv3.1 in mouse OVLT, brain slice electrophysiology, urine/AVP measurements, phosphorylation analysis","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO epistasis with electrophysiology and physiological readouts, multiple genetic models","pmids":["41246868"],"is_preprint":false},{"year":1998,"finding":"bFGF upregulates both Kv3.1a and Kv3.1b mRNA in cerebellar slices via PKC activation; combined bFGF and depolarization selectively increases Kv3.1b but not Kv3.1a; PKC inhibitors block bFGF-induced Kv3.1a increase; depolarization blocks nuclear PKC activation by bFGF, indicating differential signaling pathways regulate the two splice variants.","method":"In vitro cerebellar slices, RNase protection assays, PKC activity measurement, pharmacological inhibition","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — biochemical assays and mRNA quantification in slice preparation, single lab","pmids":["9526005"],"is_preprint":false},{"year":1999,"finding":"Cell-type specific expression of Kv3.1 is conferred by a negatively acting regulatory element in the 5' UTR (+350 to +158) that represses expression in non-neuronal cells; a weak positive enhancer in the proximal promoter (-123 to -71) also contributes; the 5' UTR element can confer specificity to a heterologous (thymidine kinase) promoter.","method":"Deletion analysis of Kv3.1 promoter in cell lines and transgenic mice, transient transfection assays","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — promoter deletion analysis in cell lines and transgenic mice, single lab","pmids":["10501178"],"is_preprint":false},{"year":2024,"finding":"The KCNC1 variant p.A421V causes loss of function by reducing Kv3.1 cell surface expression in PV-INs; in a mouse knockin model (Kcnc1-A421V/+), PV-IN current density is decreased, intrinsic excitability is profoundly impaired, inhibitory neurotransmission is altered in young adults, and animals develop myoclonic seizures and premature lethality.","method":"Transgenic knockin mouse model, immunohistochemistry, outside-out nucleated macropatch recordings, current-clamp electrophysiology, in vivo two-photon Ca2+ imaging, EEG","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods in knockin model with in vivo validation, peer-reviewed","pmids":["41705663"],"is_preprint":false},{"year":2020,"finding":"p11 regulates the subcellular localization and cellular level of Kv3.1 in parvalbumin interneurons; deletion of p11 from PV cells reduces hippocampal Kv3.1 levels and attenuates high-frequency firing capacity; upregulation or pharmacological activation of Kv3.1 in dentate gyrus PV cells induces resilience to depression.","method":"Conditional p11 deletion in PV cells, electrophysiology, imaging, biochemical studies, viral-mediated Kv3.1 upregulation, Kv3.1 agonist application","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO combined with electrophysiology, viral rescue, and pharmacological validation","pmids":["32331822"],"is_preprint":false},{"year":2024,"finding":"Oxidative stress-induced reduction in Kv3.1 current density is caused by reduced trafficking to the cell surface associated with Src phosphorylation and ER stress, not by direct oxidation of the channel protein or reduced transcript/total protein levels; melatonin reverses this effect.","method":"D-galactose oxidative stress cell model, patch-clamp, Src phosphorylation analysis, ER stress markers, surface biotinylation","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — biochemical and electrophysiological methods in cell model, single lab, no in vivo validation","pmids":["38725150"],"is_preprint":false},{"year":2008,"finding":"Fluoxetine acts as an open-channel blocker of Kv3.1: inhibition is voltage-dependent over the channel opening range, accelerates current decay, slows deactivation (tail crossover), and is use-dependent, with IC50 ~13.4 µM.","method":"Whole-cell patch-clamp on CHO cells stably expressing rat Kv3.1","journal":"Journal of pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct electrophysiology with kinetic analysis, single lab","pmids":["18187934"],"is_preprint":false},{"year":2001,"finding":"Norfluoxetine (major fluoxetine metabolite) acts as an open-channel blocker of Kv3.1 with IC50 ~0.80 µM (whole-cell) and 0.19 µM (inside-out, cytoplasmic application); both drugs inhibit Kv3.1 at clinically relevant concentrations.","method":"Whole-cell and inside-out patch-clamp on CHO cells expressing rat Kv3.1","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct electrophysiology with inside-out confirmation, single lab","pmids":["11543764"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM structure of Kv3.1 with a novel positive modulator reveals the compound binding site and structural basis for positive modulation; structural analysis defines molecular determinants at the voltage sensor-pore interface.","method":"Cryo-EM structure determination of Kv3.1 in complex with positive modulator, biophysical characterization","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with bound modulator providing direct structural evidence for binding site","pmids":["37812700"],"is_preprint":false},{"year":2024,"finding":"The KCNC1 S474C variant causes retention of Kv3.1 in the endoplasmic reticulum and failure of ER-to-Golgi trafficking, reducing channel presence at the plasma membrane; neurons expressing Kv3.1-S474C show reduced firing frequency and exclusion from the axon initial segment.","method":"Electrophysiological and biochemical assays in transfected cells, immunofluorescence in murine primary cultures, computational neuronal modeling","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple methods (biochemistry, imaging, electrophysiology, modeling) but preprint, not peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"Kv3.1 (KCNC1) is a high-threshold, rapidly activating and deactivating voltage-gated K+ channel that enables fast action potential repolarization and high-frequency firing in parvalbumin-positive GABAergic interneurons and auditory brainstem neurons; its gating is constitutively set by casein kinase 2 phosphorylation and dynamically modulated by PKC dephosphorylation in response to activity; its two splice isoforms (Kv3.1a/b) are differentially targeted to axonal vs. somatodendritic compartments via electrostatic interactions in the C-terminal splice domain; it forms heteromeric channels with Kv3.2 and Kv3.4 subunits and associates with MiRP2 and OSP/claudin-11; the channel is degraded via UBR5-mediated ubiquitination; cryo-EM structures reveal that the cytoplasmic T1 domain—containing a conserved zinc site—controls gating through interactions with S4/S5 linker residues and S6T helices, and a novel binding site at the voltage sensor-pore interface mediates positive modulator action; pathogenic variants cause dominant-negative or simple loss-of-function, leading to progressive myoclonus epilepsy (MEAK) or developmental epileptic encephalopathy, while select S6-region variants cause gain-of-function by shifting activation to hyperpolarized potentials."},"narrative":{"mechanistic_narrative":"KCNC1 encodes Kv3.1, a high-threshold, rapidly activating and deactivating voltage-gated potassium channel that drives fast action-potential repolarization and enables sustained high-frequency firing in fast-spiking neurons, including auditory brainstem and parvalbumin-positive interneurons [PMID:9547392, PMID:32331822]. By producing rapid repolarization, Kv3.1 minimizes spike broadening and limits activity-dependent presynaptic Ca2+ influx, thereby shaping synaptic transmission and short-term plasticity [PMID:12930807, PMID:9801357]. Channel gating is set post-translationally: constitutive casein kinase 2 phosphorylation maintains the high voltage threshold, while activity-driven PKC dephosphorylation increases current to facilitate high-frequency spiking [PMID:16136041, PMID:11160386]. Kv3.1 assembles into homotetramers and heteromers with Kv3.2 and Kv3.4, and its two C-terminal splice isoforms (Kv3.1a/b) are differentially targeted to axonal versus somatodendritic membranes through electrostatic interactions in the splice domain that unmask an axonal targeting motif [PMID:12592408, PMID:12091563, PMID:22105078, PMID:10482766]. The channel associates with auxiliary and partner proteins including MiRP2, OSP/claudin-11, and p11, and its surface abundance is controlled by trafficking and by UBR5-mediated ubiquitin-proteasomal degradation [PMID:12954870, PMID:16624990, PMID:32331822, PMID:38865078]. Cryo-EM structures define a rotated zinc-containing T1 cytoplasmic domain that controls gating via interactions with S6T helices, and a modulator-binding site at the voltage-sensor–pore interface that overlaps a disease-mutation hotspot [PMID:35840580, PMID:36741467, PMID:37812700]. Pathogenic KCNC1 variants cause progressive myoclonus epilepsy (MEAK) and developmental epileptic encephalopathy: the recurrent p.R320H acts by dominant-negative loss of function through slowed activation, other variants reduce current or surface expression, and select S6-region variants instead confer gain of function by shifting activation to hyperpolarized potentials [PMID:25401298, PMID:33735526, PMID:31353855, PMID:36419348, PMID:41705663].","teleology":[{"year":1992,"claim":"Establishing that KCNC1 encodes a functional voltage-gated K+ channel was the foundational step, defining its biophysical identity and chromosomal locus.","evidence":"Heterologous expression in Xenopus oocytes with matched native T-lymphocyte channel properties and RT-PCR","pmids":["1400413"],"confidence":"High","gaps":["Did not address neuronal function","No subunit composition or partners identified"]},{"year":1998,"claim":"Linking Kv3.1 to a high-threshold, fast K+ current resolved why fast-spiking neurons can follow high-frequency stimulation, defining the channel's core physiological role.","evidence":"Patch-clamp, TEA/DTX pharmacology, in situ hybridization and simulation in MNTB auditory neurons; complementary work in inferior colliculus, cochlear nucleus, and Aplysia neurons","pmids":["9547392","9786983","9465111","9801357"],"confidence":"High","gaps":["Mechanism coupling repolarization to Ca2+ control inferred indirectly in some systems","Native subunit composition not fully defined"]},{"year":1999,"claim":"Demonstrating heteromeric assembly with Kv3.2 (and later Kv3.4) showed that native Kv3 currents arise from mixed tetramers, refining the molecular basis of fast-spiking currents.","evidence":"Co-IP from pallidal membranes with electrophysiology; co-assembly studies with Kv3.4 in heterologous and native systems","pmids":["10482766","12592408"],"confidence":"High","gaps":["Stoichiometry of native heteromers not quantified","Region-specific subunit ratios unknown"]},{"year":2005,"claim":"Identifying CK2 and PKC phosphorylation as opposing regulators explained how Kv3.1 gating is dynamically tuned to neuronal activity rather than being static.","evidence":"Phosphorylation assays, alkaline phosphatase/CK2 inhibitor manipulation, and patch-clamp in CHO cells and native MNTB/brainstem neurons","pmids":["11160386","16136041"],"confidence":"High","gaps":["Phosphatases mediating dephosphorylation not fully identified","Spatial control of kinase access not resolved"]},{"year":2011,"claim":"Mapping splice-isoform-specific axonal versus somatodendritic targeting clarified how identical biophysics yield compartment-specific control of firing.","evidence":"Isoform-specific immunohistochemistry/EM and terminal mutagenesis with patch-clamp in cultured neurons","pmids":["12091563","22105078"],"confidence":"High","gaps":["Trafficking machinery recognizing the motif not identified","In vivo consequences of mistargeting not tested"]},{"year":2020,"claim":"Defining selectivity-filter and pore determinants of conduction and U-type inactivation linked specific residues to permeation and gating mechanisms.","evidence":"Site-directed mutagenesis (P-region, S6, T400) with single-channel and whole-cell patch-clamp and ionic manipulation","pmids":["7696467","32365329","16792699"],"confidence":"High","gaps":["Physiological role of U-type inactivation in vivo unresolved","Glycosylation's in vivo contribution not established"]},{"year":2014,"claim":"Discovery that p.R320H causes MEAK via dominant-negative loss of function defined the first disease mechanism and a basis for fever-dependent clinical fluctuation.","evidence":"Exome sequencing plus heterologous patch-clamp, with temperature-dependent analysis and interneuron expression","pmids":["25401298","28380698","33735526"],"confidence":"High","gaps":["Why interneuron viability/neurite development is affected not fully mechanistic","Therapeutic correction of dominant-negative effect not established"]},{"year":2019,"claim":"Functional characterization of additional variants expanded the disease spectrum, distinguishing simple loss of function, trafficking defects, and gain of function.","evidence":"Two-electrode voltage clamp in oocytes, mammalian patch-clamp, surface biotinylation, and a knockin mouse model across multiple variants","pmids":["31353855","36419348","37203213","41705663"],"confidence":"High","gaps":["Genotype-phenotype prediction for novel variants incomplete","Gain-of-function variants studied in single reports with limited replication"]},{"year":2021,"claim":"Identifying a variant (A513V) that abolishes PKC modulation without altering basal current showed that disrupting regulatory tuning, not channel function, can be pathologically relevant.","evidence":"Phosphorylation assays and whole-cell patch-clamp in transfected cells","pmids":["34232791"],"confidence":"High","gaps":["In vivo phenotype of regulatory loss not established","Whether this defines a distinct clinical class unknown"]},{"year":2022,"claim":"Cryo-EM structures provided the atomic framework for gating and modulation, localizing a rotated zinc-containing T1 domain and a voltage-sensor–pore modulator site coinciding with disease mutations.","evidence":"Cryo-EM of apo and ligand-bound human Kv3.1 with MD simulations, mutagenesis and electrophysiology","pmids":["35840580","36741467","37812700"],"confidence":"High","gaps":["Structures of heteromeric Kv3.1/Kv3.2/Kv3.4 channels not determined","Structural basis of phosphoregulation not resolved"]},{"year":2024,"claim":"Establishing UBR5-driven ubiquitin-proteasomal degradation and trafficking control of Kv3.1 defined post-translational regulation of channel abundance relevant to inflammatory pain.","evidence":"Co-IP, ubiquitination assays, competitive peptide rescue, knockdown/knockout, and patch-clamp in spinal cord; oxidative-stress trafficking studies","pmids":["38865078","38725150"],"confidence":"High","gaps":["Trafficking findings under oxidative stress are single-lab and lack in vivo validation","Other E3 ligases or deubiquitinases not characterized"]},{"year":2025,"claim":"Defining Kv3.1 as a downstream effector of the WNK1-OSR1/SPAK osmosensing cascade extended its role beyond fast firing to systemic homeostasis (vasopressin release).","evidence":"Conditional Osr1/Spak and Kv3.1 knockout in mouse OVLT with slice electrophysiology and AVP/urine measurements; p11-dependent regulation in PV cells","pmids":["41246868","32331822"],"confidence":"High","gaps":["Direct biochemical coupling between SPAK/OSR1 and Kv3.1 not resolved","Generality of kinase-cascade regulation across neuron types unknown"]},{"year":null,"claim":"How the diverse modulatory inputs (phosphorylation, splice targeting, auxiliary subunits, degradation, and kinase cascades) are integrated within native heteromeric channels in vivo, and how this can be therapeutically corrected in disease, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of native heteromers","Integrated in vivo regulatory model lacking","Pharmacological correction of dominant-negative and gain-of-function variants unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,4,27]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,7,11,23,39]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[35,39]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,2,21,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[12,15,16,33]}],"complexes":["Kv3.1/Kv3.2 heteromeric channel","Kv3.1/Kv3.4 heteromeric channel"],"partners":["KCNC2","KCNC4","KCNE3","CLDN11","S100A10","UBR5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P48547","full_name":"Voltage-gated potassium channel KCNC1","aliases":["NGK2","Potassium voltage-gated channel subfamily C member 1","Voltage-gated potassium channel subunit Kv3.1","Voltage-gated potassium channel subunit Kv4"],"length_aa":511,"mass_kda":57.9,"function":"Voltage-gated potassium channel that opens in response to the voltage difference across the membrane and through which potassium ions pass in accordance with their electrochemical gradient (PubMed:25401298, PubMed:35840580). The mechanism is time-dependent and inactivation is slow (By similarity). Plays an important role in the rapid repolarization of fast-firing brain neurons (By similarity). Can form functional homotetrameric channels and heterotetrameric channels that contain variable proportions of KCNC2, and possibly other family members as well (By similarity). Contributes to fire sustained trains of very brief action potentials at high frequency in pallidal neurons (By similarity)","subcellular_location":"Cell membrane; Cell projection, axon; Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/P48547/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNC1","classification":"Not Classified","n_dependent_lines":19,"n_total_lines":1208,"dependency_fraction":0.015728476821192054},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNC1","total_profiled":1310},"omim":[{"mim_id":"616187","title":"EPILEPSY, PROGRESSIVE MYOCLONIC 7; EPM7","url":"https://www.omim.org/entry/616187"},{"mim_id":"614487","title":"SPASTIC ATAXIA 5, AUTOSOMAL RECESSIVE; SPAX5","url":"https://www.omim.org/entry/614487"},{"mim_id":"608164","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, SUBFAMILY V, MEMBER 1; KCNV1","url":"https://www.omim.org/entry/608164"},{"mim_id":"604581","title":"AFG3-LIKE MATRIX AAA PEPTIDASE, SUBUNIT 2; AFG3L2","url":"https://www.omim.org/entry/604581"},{"mim_id":"270550","title":"SPASTIC ATAXIA, CHARLEVOIX-SAGUENAY TYPE; SACS","url":"https://www.omim.org/entry/270550"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear membrane","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":98.9}],"url":"https://www.proteinatlas.org/search/KCNC1"},"hgnc":{"alias_symbol":["Kv3.1"],"prev_symbol":[]},"alphafold":{"accession":"P48547","domains":[{"cath_id":"3.30.710.10","chopping":"7-121","consensus_level":"high","plddt":90.049,"start":7,"end":121},{"cath_id":"1.20.120","chopping":"186-327","consensus_level":"high","plddt":88.5489,"start":186,"end":327},{"cath_id":"1.10.287.70","chopping":"331-450","consensus_level":"high","plddt":90.6845,"start":331,"end":450}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P48547","model_url":"https://alphafold.ebi.ac.uk/files/AF-P48547-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P48547-F1-predicted_aligned_error_v6.png","plddt_mean":78.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNC1","jax_strain_url":"https://www.jax.org/strain/search?query=KCNC1"},"sequence":{"accession":"P48547","fasta_url":"https://rest.uniprot.org/uniprotkb/P48547.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P48547/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P48547"}},"corpus_meta":[{"pmid":"9547392","id":"PMC_9547392","title":"Contribution of the Kv3.1 potassium channel to high-frequency firing in mouse auditory neurones.","date":"1998","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/9547392","citation_count":284,"is_preprint":false},{"pmid":"25401298","id":"PMC_25401298","title":"A recurrent de novo mutation in KCNC1 causes progressive myoclonus epilepsy.","date":"2014","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25401298","citation_count":239,"is_preprint":false},{"pmid":"1432046","id":"PMC_1432046","title":"Expression of the mRNAs for the Kv3.1 potassium channel gene in the adult and developing rat brain.","date":"1992","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/1432046","citation_count":199,"is_preprint":false},{"pmid":"12592408","id":"PMC_12592408","title":"Kv3.4 subunits enhance the repolarizing efficiency of Kv3.1 channels in fast-spiking neurons.","date":"2003","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/12592408","citation_count":118,"is_preprint":false},{"pmid":"9096148","id":"PMC_9096148","title":"Differential expression of K4-AP currents and Kv3.1 potassium channel transcripts in cortical neurons that develop distinct firing phenotypes.","date":"1997","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9096148","citation_count":117,"is_preprint":false},{"pmid":"16136041","id":"PMC_16136041","title":"Acoustic environment determines phosphorylation state of the Kv3.1 potassium channel in auditory neurons.","date":"2005","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16136041","citation_count":107,"is_preprint":false},{"pmid":"10414968","id":"PMC_10414968","title":"Delayed rectifier currents in rat globus pallidus neurons are attributable to Kv2.1 and Kv3.1/3.2 K(+) channels.","date":"1999","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10414968","citation_count":97,"is_preprint":false},{"pmid":"7825124","id":"PMC_7825124","title":"GABA-ergic interneurons of the striatum express the Shaw-like potassium channel Kv3.1.","date":"1994","source":"Synapse (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/7825124","citation_count":84,"is_preprint":false},{"pmid":"10482766","id":"PMC_10482766","title":"Kv3.1-Kv3.2 channels underlie a high-voltage-activating component of the delayed rectifier K+ current in projecting neurons from the globus pallidus.","date":"1999","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/10482766","citation_count":83,"is_preprint":false},{"pmid":"9777733","id":"PMC_9777733","title":"When, where, and how much? 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\"method\": \"Patch-clamp voltage clamp in MNTB neurons, pharmacology (TEA, DTX), in situ hybridization, computer simulation with Kv3.1 kinetics\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, pharmacology, ISH, simulation) replicated across auditory neuron literature\",\n      \"pmids\": [\"9547392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Kv3.1 encodes the type l (lymphocyte) voltage-gated K+ channel when expressed in Xenopus oocytes, with properties matching the native l-type channel in T lymphocytes; the gene maps to human chromosome 11.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes, electrophysiology, RT-PCR in T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — functional reconstitution in oocytes with matched biophysical properties, consistent with multiple independent reports\",\n      \"pmids\": [\"1400413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The Kv3.1b splice variant is regulated by PKC phosphorylation in auditory brainstem neurons: in a quiet environment Kv3.1b is basally phosphorylated, high-frequency auditory or synaptic stimulation causes rapid dephosphorylation, which increases Kv3.1 current amplitude and facilitates high-frequency spiking.\",\n      \"method\": \"Immunochemical phosphorylation assay in rat brainstem neurons, computational modeling, patch-clamp recordings\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical phosphorylation detection combined with electrophysiology and computational modeling in native neurons\",\n      \"pmids\": [\"16136041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Casein kinase 2 (CK2) constitutively phosphorylates Kv3.1, setting its high voltage-threshold of activation; dephosphorylation with alkaline phosphatase shifts activation >20 mV toward more negative potentials and increases whole-cell conductance, an effect mimicked by CK2 inhibitors but not PKC inhibitors.\",\n      \"method\": \"Patch-clamp whole-cell recording in CK2-inhibitor-treated CHO cells stably expressing Kv3.1 and native MNTB neurons; alkaline phosphatase application; biochemical phosphorylation assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical and electrophysiological approaches combined in transfected cells and native neurons, replicated with pharmacological and enzymatic tools\",\n      \"pmids\": [\"11160386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A splice variant of Kv3.4 coassembles with Kv3.1 subunits in rat brain fast-spiking neurons; this heterotetrameric assembly enhances spike repolarizing efficiency compared to Kv3.1 homomers, reducing spike duration and enabling higher repetitive firing rates.\",\n      \"method\": \"Molecular (RT-PCR), electrophysiological, and pharmacological co-expression studies in heterologous systems; co-assembly inferred from native neuron recordings\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (molecular, electrophysiological, pharmacological) across heterologous and native systems\",\n      \"pmids\": [\"12592408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MiRP2 (MinK-related peptide 2) co-immunoprecipitates with Kv3.1b from rat brain membranes, forming a native complex; MiRP2 reduces Kv3.1b current density and slows activation kinetics.\",\n      \"method\": \"Native co-immunoprecipitation from rat brain membranes, heterologous co-expression, whole-cell patch-clamp, RNAi knockdown in PC12 cells and hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP from native tissue plus functional characterization in multiple cell types\",\n      \"pmids\": [\"12954870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The two alternatively spliced Kv3.1 isoforms (Kv3.1a and Kv3.1b) have distinct subcellular localizations in neurons: Kv3.1b is targeted to somatodendritic and axonal membranes, while Kv3.1a is targeted predominantly to axonal membranes with little somatic expression; this differential targeting is conferred by their distinct C-terminal splice domains.\",\n      \"method\": \"Immunohistochemistry with isoform-specific antibodies in mouse brain sections; electron microscopy\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific antibodies confirmed by multiple brain regions and EM, replicated across neuronal populations\",\n      \"pmids\": [\"12091563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Alternative splicing controls polarized axonal targeting of Kv3.1: the Kv3.1b C-terminal splice domain creates electrostatic repulsion between N/C termini that unmasks an axonal targeting motif, directing Kv3.1b to axons; axonal Kv3.1b (but not dendritic Kv3.1a, despite identical biophysics) increases maximal firing frequency of hippocampal neurons.\",\n      \"method\": \"Mutagenesis of Kv3.1 termini, expression in cultured hippocampal neurons, patch-clamp recordings, local channel blocker application, computer simulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis + electrophysiology + simulation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22105078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of human Kv3.1a channel reveals a unique T1 cytoplasmic tetramerization domain arrangement that interacts with the C-terminal axonal targeting motif and gating machinery; S1/S2 linker-turret interactions stabilize voltage sensor-pore domain interface; S4/S5 linker residues influence gating kinetics; an electrostatic interaction between acidic residues in T1 α6 helix and R449 in S6T helices controls gating.\",\n      \"method\": \"Cryo-EM structure determination, molecular dynamics simulations, electrophysiology, mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with mutagenesis, MD simulations, and electrophysiological validation in one study\",\n      \"pmids\": [\"35840580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of human Kv3.1 at 2.6 Å reveals a T1 domain with a well-resolved Zinc site rotated 35° relative to other Kv channels; a positive modulator (Lu AG00563) binds at a novel site between the voltage-sensor domain and channel pore, a region that is a hotspot for disease-causing mutations.\",\n      \"method\": \"Cryo-EM structure determination of apo and ligand-bound Kv3.1\",\n      \"journal\": \"PNAS nexus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structures of both apo and ligand-bound forms\",\n      \"pmids\": [\"36741467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The P-region (S5-S6 loop) and C-terminal S6 segment both contribute to ion conduction: L401V in the P-region did not alter single-channel conductance or substantially change TEA sensitivity; M430L in S6 produced permeant-ion- and voltage-dependent channel flicker, indicating S6 contributes to the K+ conduction pathway.\",\n      \"method\": \"Site-directed mutagenesis, single-channel patch-clamp recordings in Xenopus oocytes\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis with single-channel electrophysiology\",\n      \"pmids\": [\"7696467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"N-glycosylation at positions N220 and N229 in the extracellular S1-S2 linker of Kv3.1 influences channel gating: double mutation N220Q/N229Q produced slower activation and a slight positive shift in voltage dependence without preventing plasma membrane trafficking; glycosylation sites were confirmed by PNGase F digestion and tunicamycin treatment.\",\n      \"method\": \"Site-directed mutagenesis (N220Q, N229Q), PNGase F and endoglycosidase H digestion, tunicamycin treatment, whole-cell patch-clamp, membrane fractionation in Sf9 cells\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with glycosidase treatment and electrophysiology\",\n      \"pmids\": [\"16792699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The recurrent de novo KCNC1 p.Arg320His mutation causes progressive myoclonus epilepsy (PME/MEAK) through a dominant-negative loss-of-function effect on the Kv3.1 channel, reducing current amplitude when co-expressed with wild-type.\",\n      \"method\": \"Exome sequencing, functional analysis of mutant channel in heterologous expression system, whole-cell patch-clamp\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional characterization in heterologous system confirmed dominant-negative mechanism, replicated across multiple labs\",\n      \"pmids\": [\"25401298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The KCNC1 p.R320H mutant Kv3.1 channel causes dominant-negative loss of function by slowing channel activation; at elevated temperatures, wild-type Kv3.1 shows a leftward shift in activation, which could partially compensate for the mutant's loss of function—explaining transient clinical improvement with fever.\",\n      \"method\": \"Whole-cell patch-clamp of wild-type and R320H mutant channels at normal and elevated temperatures\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiology with temperature manipulation confirming mechanism, consistent with dominant-negative loss-of-function\",\n      \"pmids\": [\"28380698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The Kv3.1b R320H variant (MEAK mutation) in cortical interneurons causes dominant-negative loss of function (slowing activation) and profoundly reduces excitability with inability to support high-frequency firing; additionally impairs neurite development and interneuron viability. No gating pore currents were introduced by R320H.\",\n      \"method\": \"Expression in cortical interneurons in vitro, patch-clamp, morphological analysis; oocyte recordings\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (electrophysiology, morphology, gating current analysis) in two expression systems\",\n      \"pmids\": [\"33735526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KCNC1 variants beyond p.R320H cause developmental epileptic encephalopathy; p.Ala421Val causes loss of function through reduced whole-cell current without dominant-negative effect; other DEE-associated variants also produce loss of function with reduced whole-cell currents.\",\n      \"method\": \"Xenopus oocyte expression, automated two-electrode voltage clamp\",\n      \"journal\": \"Annals of clinical and translational neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct functional characterization in standardized oocyte system for multiple variants\",\n      \"pmids\": [\"31353855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Three de novo KCNC1 variants in the S6 pore region cause gain of K+ channel function via prominent leftward (hyperpolarized) shift in voltage dependence of activation and slowed deactivation; this gain of function is predicted to reduce excitability of Kv3-expressing high-frequency-firing neurons.\",\n      \"method\": \"Whole-cell voltage clamp electrophysiology of variants in mammalian heterologous expression system\",\n      \"journal\": \"Annals of clinical and translational neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct electrophysiology in heterologous system, single study, limited replication\",\n      \"pmids\": [\"36419348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The KCNC1 A513V mutation in the cytoplasmic C-terminus produces a channel that is functionally indistinguishable from wild-type in terms of current amplitude but is completely insensitive to PKC-mediated phosphorylation at the nearby S503 site, indicating loss of modulatory regulation rather than loss of channel function.\",\n      \"method\": \"Biochemical phosphorylation assays and whole-cell patch-clamp electrophysiology in transfected cells\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — combined biochemical phosphorylation assay and electrophysiology demonstrating a specific regulatory defect\",\n      \"pmids\": [\"34232791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A novel gain-of-function KCNC1 variant V425M produces larger currents, hyperpolarizing shift in activation gating, failure to inactivate, and slower kinetics; fluoxetine blocks both wild-type and V425M channels and produced clinical improvement in the affected patient.\",\n      \"method\": \"Patch-clamp recordings in transfected CHO cells, clinical pharmacology\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct electrophysiology in heterologous system, single study, single variant\",\n      \"pmids\": [\"37203213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Kv3.1 and Kv3.2 proteins co-immunoprecipitate from pallidal membrane extracts, indicating they form heteromeric channels in parvalbumin-containing globus pallidus neurons; the native Kv3 current in these neurons matches the electrophysiological properties of expressed Kv3.1/Kv3.2.\",\n      \"method\": \"Co-immunoprecipitation from native pallidal membranes, immunohistochemistry, patch-clamp of dissociated neurons\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP from native tissue confirmed by electrophysiology, two orthogonal methods\",\n      \"pmids\": [\"10482766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Kv3.1 associates with OSP/claudin-11 in oligodendrocytes; this interaction was identified by yeast two-hybrid and confirmed by co-immunoprecipitation; Kv3.1 accounts for ~50–75% of sustained K+ current in oligodendrocyte precursor cells (OPCs) and is required for OPC proliferation, migration, and axon myelination.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, antibody blockade, Kv3.1 knockout mice, functional assays (proliferation, migration, myelination)\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP, with multiple functional assays and KO mice\",\n      \"pmids\": [\"16624990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of both Kv3.1 and Kv3.3 in cerebellar granule cells causes broader parallel fiber action potentials and reduces paired-pulse facilitation at parallel fiber-Purkinje cell synapses; normal PPF can be restored by lowering extracellular Ca2+, indicating Kv3.1/Kv3.3 channels limit activity-dependent presynaptic Ca2+ influx.\",\n      \"method\": \"Kv3.1/Kv3.3 double-knockout mice, electrophysiological recordings of parallel fiber APs and synaptic transmission, extracellular Ca2+ manipulation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-KO with defined synaptic phenotype and rescue experiment using Ca2+ manipulation\",\n      \"pmids\": [\"12930807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kv3.1 in deep cerebellar nucleus (DCN) neurons is required for fast action potential repolarization and normal gait patterning; loss of Kcnc1 alleles in Kcnc3-null mice causes progressive spike broadening and deceleration in DCN neurons and increasing gait ataxia; Purkinje-cell-restricted Kv3.3 restoration failed to rescue gait ataxia when all Kcnc1 alleles were also absent.\",\n      \"method\": \"Genetic epistasis using Kcnc1/Kcnc3 allele combinations in mice; electrophysiological recordings of DCN neurons; behavioral analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — allele-dose epistasis combined with electrophysiology and behavioral outcomes across multiple genotypes\",\n      \"pmids\": [\"20016089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Kv3.1 channel localizes to spine-like protrusions adjacent to postsynaptic membranes of cochlear nucleus bushy cells; K+ depletion within these confined spine-like structures produces apparent channel inactivation, demonstrating that compartmentalized ionic transients can be generated in spine-like structures.\",\n      \"method\": \"Electron immunomicroscopy, cell-attached patch-clamp of Kv3.1-transfected CHO cell vesicles mimicking spine geometry\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — EM localization combined with functional reconstitution in defined geometry\",\n      \"pmids\": [\"9465111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Depolarization and calcium influx selectively increase Kv3.1 mRNA and high-threshold noninactivating K+ current in developing inferior colliculus neurons, an effect blocked by calcium channel blockers; increased Kv3.1-like current causes more rapid and complete action potential repolarization.\",\n      \"method\": \"Potassium-induced depolarization of inferior colliculus neurons, RT-PCR, voltage-clamp, calcium channel blockers, computer simulation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological dissection with calcium blockers, mRNA quantification, electrophysiology, simulation\",\n      \"pmids\": [\"9786983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In deep cerebellar nuclear neurons, Kv3.1 channels dominate spike repolarization and enable fast evoked firing; in contrast, BK channels predominantly control spontaneous firing rate; when Kv3.1 is blocked, BK channels gain a compensatory role in repolarization.\",\n      \"method\": \"Whole-cell patch-clamp in DCN neurons with selective BK and Kv3.1 channel blockers (iberiotoxin, 4-aminopyridine 20 µM)\",\n      \"journal\": \"Cerebellum\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — selective pharmacology in native neurons, single lab study\",\n      \"pmids\": [\"21750937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Heterologous expression of Kv3.1 in Aplysia bag cell neurons eliminates frequency-dependent spike broadening by rapid repolarization; this prevents the depolarizing afterpotential that would otherwise trigger prolonged spontaneous firing, demonstrating that spike broadening regulates calcium entry (up to 5-fold increase) which in turn induces long-term changes in excitability.\",\n      \"method\": \"Heterologous Kv3.1 expression in Aplysia neurons, current-clamp recordings, calcium current integral measurements, BAPTA chelation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — heterologous expression with defined functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"9801357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"U-type inactivation in Kv3.1 requires the second threonine (T400) of the selectivity filter TTVGYG sequence; T400A mutation eliminates U-type inactivation, yielding noninactivating currents, indicating the selectivity filter is allosterically involved in the inactivation gating mechanism.\",\n      \"method\": \"Site-directed mutagenesis (T400A), whole-cell patch-clamp in hKv3.1 expressed in heterologous cells, variation of extracellular K+ concentration\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis with clear functional readout and ionic manipulation to confirm mechanism\",\n      \"pmids\": [\"32365329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The polyether toxin gambierol inhibits Kv3.1 by anchoring the voltage-sensing domain (VSD) in the resting/closed state; it acts via a lipid-exposed binding site outside the K+ permeation pathway; the resting channel conformation is the high-affinity state; strong depolarizations allow VSD movement to an activated-not-open state but toxin must dissociate before channel opens; a tetrameric concatemer with only one high-affinity site retains high toxin sensitivity.\",\n      \"method\": \"Gating current analysis, ionic current analysis, concatemer mutagenesis, whole-cell patch-clamp in heterologous cells\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — gating current analysis combined with concatemer mutagenesis and ionic current recordings\",\n      \"pmids\": [\"23401573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"UBR5 E3 ubiquitin ligase directly binds Kv3.1 and drives its ubiquitin-mediated proteasomal degradation in the spinal cord during inflammatory pain; Kv3.1 protein (but not mRNA) is decreased after CFA injection; a competitive peptide (TP-CH-401) matching the Kv3.1 ubiquitination motif rescues Kv3.1 expression and Kv currents and attenuates pain behaviors.\",\n      \"method\": \"Co-immunoprecipitation of UBR5-Kv3.1, ubiquitination assays, Kv3.1 KD/KO, intrathecal peptide injection, whole-cell patch-clamp\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding confirmed by co-IP, ubiquitination assay, competitive peptide rescue, electrophysiology\",\n      \"pmids\": [\"38865078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In OVLT neurons, hypertonicity activates the WNK1→OSR1/SPAK kinase cascade, which in turn increases Kv3.1 channel currents to enhance action potential firing and trigger arginine vasopressin (AVP) release; deletion of Osr1 and Spak in the OVLT blunts hypertonicity-induced AP firing and AVP release, phenocopying Kv3.1 OVLT deletion.\",\n      \"method\": \"Conditional knockout of Osr1/Spak and Kv3.1 in mouse OVLT, brain slice electrophysiology, urine/AVP measurements, phosphorylation analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO epistasis with electrophysiology and physiological readouts, multiple genetic models\",\n      \"pmids\": [\"41246868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"bFGF upregulates both Kv3.1a and Kv3.1b mRNA in cerebellar slices via PKC activation; combined bFGF and depolarization selectively increases Kv3.1b but not Kv3.1a; PKC inhibitors block bFGF-induced Kv3.1a increase; depolarization blocks nuclear PKC activation by bFGF, indicating differential signaling pathways regulate the two splice variants.\",\n      \"method\": \"In vitro cerebellar slices, RNase protection assays, PKC activity measurement, pharmacological inhibition\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — biochemical assays and mRNA quantification in slice preparation, single lab\",\n      \"pmids\": [\"9526005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Cell-type specific expression of Kv3.1 is conferred by a negatively acting regulatory element in the 5' UTR (+350 to +158) that represses expression in non-neuronal cells; a weak positive enhancer in the proximal promoter (-123 to -71) also contributes; the 5' UTR element can confer specificity to a heterologous (thymidine kinase) promoter.\",\n      \"method\": \"Deletion analysis of Kv3.1 promoter in cell lines and transgenic mice, transient transfection assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — promoter deletion analysis in cell lines and transgenic mice, single lab\",\n      \"pmids\": [\"10501178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The KCNC1 variant p.A421V causes loss of function by reducing Kv3.1 cell surface expression in PV-INs; in a mouse knockin model (Kcnc1-A421V/+), PV-IN current density is decreased, intrinsic excitability is profoundly impaired, inhibitory neurotransmission is altered in young adults, and animals develop myoclonic seizures and premature lethality.\",\n      \"method\": \"Transgenic knockin mouse model, immunohistochemistry, outside-out nucleated macropatch recordings, current-clamp electrophysiology, in vivo two-photon Ca2+ imaging, EEG\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods in knockin model with in vivo validation, peer-reviewed\",\n      \"pmids\": [\"41705663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"p11 regulates the subcellular localization and cellular level of Kv3.1 in parvalbumin interneurons; deletion of p11 from PV cells reduces hippocampal Kv3.1 levels and attenuates high-frequency firing capacity; upregulation or pharmacological activation of Kv3.1 in dentate gyrus PV cells induces resilience to depression.\",\n      \"method\": \"Conditional p11 deletion in PV cells, electrophysiology, imaging, biochemical studies, viral-mediated Kv3.1 upregulation, Kv3.1 agonist application\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO combined with electrophysiology, viral rescue, and pharmacological validation\",\n      \"pmids\": [\"32331822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Oxidative stress-induced reduction in Kv3.1 current density is caused by reduced trafficking to the cell surface associated with Src phosphorylation and ER stress, not by direct oxidation of the channel protein or reduced transcript/total protein levels; melatonin reverses this effect.\",\n      \"method\": \"D-galactose oxidative stress cell model, patch-clamp, Src phosphorylation analysis, ER stress markers, surface biotinylation\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — biochemical and electrophysiological methods in cell model, single lab, no in vivo validation\",\n      \"pmids\": [\"38725150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Fluoxetine acts as an open-channel blocker of Kv3.1: inhibition is voltage-dependent over the channel opening range, accelerates current decay, slows deactivation (tail crossover), and is use-dependent, with IC50 ~13.4 µM.\",\n      \"method\": \"Whole-cell patch-clamp on CHO cells stably expressing rat Kv3.1\",\n      \"journal\": \"Journal of pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct electrophysiology with kinetic analysis, single lab\",\n      \"pmids\": [\"18187934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Norfluoxetine (major fluoxetine metabolite) acts as an open-channel blocker of Kv3.1 with IC50 ~0.80 µM (whole-cell) and 0.19 µM (inside-out, cytoplasmic application); both drugs inhibit Kv3.1 at clinically relevant concentrations.\",\n      \"method\": \"Whole-cell and inside-out patch-clamp on CHO cells expressing rat Kv3.1\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct electrophysiology with inside-out confirmation, single lab\",\n      \"pmids\": [\"11543764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structure of Kv3.1 with a novel positive modulator reveals the compound binding site and structural basis for positive modulation; structural analysis defines molecular determinants at the voltage sensor-pore interface.\",\n      \"method\": \"Cryo-EM structure determination of Kv3.1 in complex with positive modulator, biophysical characterization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with bound modulator providing direct structural evidence for binding site\",\n      \"pmids\": [\"37812700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The KCNC1 S474C variant causes retention of Kv3.1 in the endoplasmic reticulum and failure of ER-to-Golgi trafficking, reducing channel presence at the plasma membrane; neurons expressing Kv3.1-S474C show reduced firing frequency and exclusion from the axon initial segment.\",\n      \"method\": \"Electrophysiological and biochemical assays in transfected cells, immunofluorescence in murine primary cultures, computational neuronal modeling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple methods (biochemistry, imaging, electrophysiology, modeling) but preprint, not peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"Kv3.1 (KCNC1) is a high-threshold, rapidly activating and deactivating voltage-gated K+ channel that enables fast action potential repolarization and high-frequency firing in parvalbumin-positive GABAergic interneurons and auditory brainstem neurons; its gating is constitutively set by casein kinase 2 phosphorylation and dynamically modulated by PKC dephosphorylation in response to activity; its two splice isoforms (Kv3.1a/b) are differentially targeted to axonal vs. somatodendritic compartments via electrostatic interactions in the C-terminal splice domain; it forms heteromeric channels with Kv3.2 and Kv3.4 subunits and associates with MiRP2 and OSP/claudin-11; the channel is degraded via UBR5-mediated ubiquitination; cryo-EM structures reveal that the cytoplasmic T1 domain—containing a conserved zinc site—controls gating through interactions with S4/S5 linker residues and S6T helices, and a novel binding site at the voltage sensor-pore interface mediates positive modulator action; pathogenic variants cause dominant-negative or simple loss-of-function, leading to progressive myoclonus epilepsy (MEAK) or developmental epileptic encephalopathy, while select S6-region variants cause gain-of-function by shifting activation to hyperpolarized potentials.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNC1 encodes Kv3.1, a high-threshold, rapidly activating and deactivating voltage-gated potassium channel that drives fast action-potential repolarization and enables sustained high-frequency firing in fast-spiking neurons, including auditory brainstem and parvalbumin-positive interneurons [#0, #34]. By producing rapid repolarization, Kv3.1 minimizes spike broadening and limits activity-dependent presynaptic Ca2+ influx, thereby shaping synaptic transmission and short-term plasticity [#21, #26]. Channel gating is set post-translationally: constitutive casein kinase 2 phosphorylation maintains the high voltage threshold, while activity-driven PKC dephosphorylation increases current to facilitate high-frequency spiking [#2, #3]. Kv3.1 assembles into homotetramers and heteromers with Kv3.2 and Kv3.4, and its two C-terminal splice isoforms (Kv3.1a/b) are differentially targeted to axonal versus somatodendritic membranes through electrostatic interactions in the splice domain that unmask an axonal targeting motif [#4, #6, #7, #19]. The channel associates with auxiliary and partner proteins including MiRP2, OSP/claudin-11, and p11, and its surface abundance is controlled by trafficking and by UBR5-mediated ubiquitin-proteasomal degradation [#5, #20, #34, #29]. Cryo-EM structures define a rotated zinc-containing T1 cytoplasmic domain that controls gating via interactions with S6T helices, and a modulator-binding site at the voltage-sensor–pore interface that overlaps a disease-mutation hotspot [#8, #9, #38]. Pathogenic KCNC1 variants cause progressive myoclonus epilepsy (MEAK) and developmental epileptic encephalopathy: the recurrent p.R320H acts by dominant-negative loss of function through slowed activation, other variants reduce current or surface expression, and select S6-region variants instead confer gain of function by shifting activation to hyperpolarized potentials [#12, #14, #15, #16, #33].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Establishing that KCNC1 encodes a functional voltage-gated K+ channel was the foundational step, defining its biophysical identity and chromosomal locus.\",\n      \"evidence\": \"Heterologous expression in Xenopus oocytes with matched native T-lymphocyte channel properties and RT-PCR\",\n      \"pmids\": [\"1400413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address neuronal function\", \"No subunit composition or partners identified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Linking Kv3.1 to a high-threshold, fast K+ current resolved why fast-spiking neurons can follow high-frequency stimulation, defining the channel's core physiological role.\",\n      \"evidence\": \"Patch-clamp, TEA/DTX pharmacology, in situ hybridization and simulation in MNTB auditory neurons; complementary work in inferior colliculus, cochlear nucleus, and Aplysia neurons\",\n      \"pmids\": [\"9547392\", \"9786983\", \"9465111\", \"9801357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling repolarization to Ca2+ control inferred indirectly in some systems\", \"Native subunit composition not fully defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating heteromeric assembly with Kv3.2 (and later Kv3.4) showed that native Kv3 currents arise from mixed tetramers, refining the molecular basis of fast-spiking currents.\",\n      \"evidence\": \"Co-IP from pallidal membranes with electrophysiology; co-assembly studies with Kv3.4 in heterologous and native systems\",\n      \"pmids\": [\"10482766\", \"12592408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of native heteromers not quantified\", \"Region-specific subunit ratios unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identifying CK2 and PKC phosphorylation as opposing regulators explained how Kv3.1 gating is dynamically tuned to neuronal activity rather than being static.\",\n      \"evidence\": \"Phosphorylation assays, alkaline phosphatase/CK2 inhibitor manipulation, and patch-clamp in CHO cells and native MNTB/brainstem neurons\",\n      \"pmids\": [\"11160386\", \"16136041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatases mediating dephosphorylation not fully identified\", \"Spatial control of kinase access not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapping splice-isoform-specific axonal versus somatodendritic targeting clarified how identical biophysics yield compartment-specific control of firing.\",\n      \"evidence\": \"Isoform-specific immunohistochemistry/EM and terminal mutagenesis with patch-clamp in cultured neurons\",\n      \"pmids\": [\"12091563\", \"22105078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery recognizing the motif not identified\", \"In vivo consequences of mistargeting not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defining selectivity-filter and pore determinants of conduction and U-type inactivation linked specific residues to permeation and gating mechanisms.\",\n      \"evidence\": \"Site-directed mutagenesis (P-region, S6, T400) with single-channel and whole-cell patch-clamp and ionic manipulation\",\n      \"pmids\": [\"7696467\", \"32365329\", \"16792699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological role of U-type inactivation in vivo unresolved\", \"Glycosylation's in vivo contribution not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that p.R320H causes MEAK via dominant-negative loss of function defined the first disease mechanism and a basis for fever-dependent clinical fluctuation.\",\n      \"evidence\": \"Exome sequencing plus heterologous patch-clamp, with temperature-dependent analysis and interneuron expression\",\n      \"pmids\": [\"25401298\", \"28380698\", \"33735526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why interneuron viability/neurite development is affected not fully mechanistic\", \"Therapeutic correction of dominant-negative effect not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Functional characterization of additional variants expanded the disease spectrum, distinguishing simple loss of function, trafficking defects, and gain of function.\",\n      \"evidence\": \"Two-electrode voltage clamp in oocytes, mammalian patch-clamp, surface biotinylation, and a knockin mouse model across multiple variants\",\n      \"pmids\": [\"31353855\", \"36419348\", \"37203213\", \"41705663\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype prediction for novel variants incomplete\", \"Gain-of-function variants studied in single reports with limited replication\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying a variant (A513V) that abolishes PKC modulation without altering basal current showed that disrupting regulatory tuning, not channel function, can be pathologically relevant.\",\n      \"evidence\": \"Phosphorylation assays and whole-cell patch-clamp in transfected cells\",\n      \"pmids\": [\"34232791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo phenotype of regulatory loss not established\", \"Whether this defines a distinct clinical class unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM structures provided the atomic framework for gating and modulation, localizing a rotated zinc-containing T1 domain and a voltage-sensor–pore modulator site coinciding with disease mutations.\",\n      \"evidence\": \"Cryo-EM of apo and ligand-bound human Kv3.1 with MD simulations, mutagenesis and electrophysiology\",\n      \"pmids\": [\"35840580\", \"36741467\", \"37812700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures of heteromeric Kv3.1/Kv3.2/Kv3.4 channels not determined\", \"Structural basis of phosphoregulation not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Establishing UBR5-driven ubiquitin-proteasomal degradation and trafficking control of Kv3.1 defined post-translational regulation of channel abundance relevant to inflammatory pain.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, competitive peptide rescue, knockdown/knockout, and patch-clamp in spinal cord; oxidative-stress trafficking studies\",\n      \"pmids\": [\"38865078\", \"38725150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking findings under oxidative stress are single-lab and lack in vivo validation\", \"Other E3 ligases or deubiquitinases not characterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defining Kv3.1 as a downstream effector of the WNK1-OSR1/SPAK osmosensing cascade extended its role beyond fast firing to systemic homeostasis (vasopressin release).\",\n      \"evidence\": \"Conditional Osr1/Spak and Kv3.1 knockout in mouse OVLT with slice electrophysiology and AVP/urine measurements; p11-dependent regulation in PV cells\",\n      \"pmids\": [\"41246868\", \"32331822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical coupling between SPAK/OSR1 and Kv3.1 not resolved\", \"Generality of kinase-cascade regulation across neuron types unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse modulatory inputs (phosphorylation, splice targeting, auxiliary subunits, degradation, and kinase cascades) are integrated within native heteromeric channels in vivo, and how this can be therapeutically corrected in disease, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of native heteromers\", \"Integrated in vivo regulatory model lacking\", \"Pharmacological correction of dominant-negative and gain-of-function variants unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 4, 27]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 7, 11, 23, 39]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [35, 39]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 2, 21, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [12, 15, 16, 33]}\n    ],\n    \"complexes\": [\n      \"Kv3.1/Kv3.2 heteromeric channel\",\n      \"Kv3.1/Kv3.4 heteromeric channel\"\n    ],\n    \"partners\": [\n      \"KCNC2\",\n      \"KCNC4\",\n      \"KCNE3\",\n      \"CLDN11\",\n      \"S100A10\",\n      \"UBR5\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}