{"gene":"KCNQ3","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1998,"finding":"KCNQ2 and KCNQ3 subunits co-express in brain with overlapping patterns and form heteromeric channels whose biophysical properties, pharmacological sensitivity, and expression pattern correspond to the native neuronal M-current.","method":"Xenopus oocyte expression, electrophysiology, pharmacology, in situ hybridization","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in heterologous system, multiple orthogonal methods (electrophysiology + pharmacology + expression mapping), replicated across multiple labs","pmids":["9836639"],"is_preprint":false},{"year":1998,"finding":"KCNQ2/KCNQ3 heteromeric channels produce currents at least 10-fold larger than respective homomeric channels; KCNQ2/KCNQ3 currents are increased by intracellular cyclic AMP via a phosphorylation site on KCNQ2's amino terminus; BFNC mutations cause loss of function without dominant-negative effect on heteromers.","method":"Xenopus oocyte expression, whole-cell patch clamp, site-directed mutagenesis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, replicated in multiple labs","pmids":["9872318"],"is_preprint":false},{"year":2000,"finding":"Muscarinic modulation of KCNQ2/KCNQ3 heteromeric channels reconstituted with M1 receptors mirrors native M-current modulation; modulation is not blocked by Ca2+ chelation or broad-spectrum PKC inhibition (staurosporine), ruling out Ca2+ and protein kinases as diffusible messengers; both homomeric KCNQ2 and KCNQ3 subunits are individually susceptible to oxo-M modulation.","method":"Whole-cell patch clamp, indo-1 Ca2+ imaging, pharmacological dissection in tsA-201 cells","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with cloned components plus multiple pharmacological controls, replicated by subsequent studies","pmids":["10684873"],"is_preprint":false},{"year":2000,"finding":"Co-expression of KCNQ2 and KCNQ3 increases surface expression of both subunits (KCNQ2 ~5-fold, KCNQ3 >10-fold), and the current increase upon co-expression is predominantly due to increased surface expression; a truncated KCNQ2 BFNC mutant fails to reach the surface and fails to stimulate KCNQ3 surface expression.","method":"Xenopus oocyte expression, noise analysis, single-channel recordings, surface expression assays","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (noise analysis, single-channel, surface expression), clear mechanistic conclusion","pmids":["10788442"],"is_preprint":false},{"year":2000,"finding":"A novel KCNQ3 pore-loop mutation (W309R) causes BFNC2 by disrupting the conserved tryptophan in the P-loop that holds the channel pore open.","method":"Sequencing, co-segregation analysis, functional inference from conserved pore residue","journal":"Annals of Neurology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — human genetics plus sequence conservation argument; electrophysiological confirmation provided later by other papers","pmids":["10852552"],"is_preprint":false},{"year":2000,"finding":"KCNE2 (MinK-related peptide 1) associates with KCNQ2 and/or KCNQ3 subunits in brain and, when co-expressed in COS cells, accelerates deactivation kinetics of KCNQ2 and the KCNQ2/KCNQ3 complex.","method":"Co-immunoprecipitation, transient transfection, electrophysiology","journal":"FEBS Letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus functional electrophysiology in a single lab, single study","pmids":["11034315"],"is_preprint":false},{"year":2001,"finding":"Single-channel recordings show that homomeric KCNQ3 channels have the same slope conductance (~9 pS) as KCNQ2/KCNQ3 heteromers but higher open probability, while KCNQ2 homomers have lower conductance and open probability; KCNQ2 is thus primarily responsible for surface expression and KCNQ3 for modifying channel function.","method":"Cell-attached patch clamp, perforated-patch whole-cell recordings in CHO cells","journal":"The Journal of Physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct single-channel recordings with rigorous biophysical characterization","pmids":["11432988"],"is_preprint":false},{"year":2002,"finding":"KCNQ3 antibodies confirm KCNQ2 and KCNQ3 subunits are present at SCG and hippocampal neurons; N-ethylmaleimide augments KCNQ2 but not KCNQ3 currents through a cysteine at position C242 of KCNQ2, localizing a pharmacological action to KCNQ2.","method":"Specific antibody labeling, site-directed mutagenesis, patch clamp in tsA-201 cells and SCG neurons","journal":"British Journal of Pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus antibody labeling, single lab","pmids":["12466226"],"is_preprint":false},{"year":2002,"finding":"A BFNC KCNQ2 mutation (R214W) in the S4 voltage-sensing domain causes slower channel opening, faster closing, and decreased voltage sensitivity without reducing maximal current or surface expression, demonstrating that gating alterations (not just reduced current) can cause neonatal epilepsy.","method":"Patch-clamp electrophysiology of heteromeric KCNQ2/KCNQ3 channels in mammalian cells","journal":"The Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct electrophysiology with defined gating parameters, single lab","pmids":["11784811"],"is_preprint":false},{"year":2003,"finding":"KCNQ2 and KCNQ3 co-express with 1:1 stoichiometry in CHO cells and in native SCG neurons, as determined by TEA block curves compared against a KCNQ3/2 tandem construct.","method":"TEA concentration-inhibition analysis, tandem-construct pharmacology, quantitative PCR, immunocytochemistry","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal approaches (pharmacology, tandem constructs, qPCR, ICC) in native and heterologous systems","pmids":["12832524"],"is_preprint":false},{"year":2003,"finding":"The C-terminal A-domain (~80 amino acids) plus either the B-domain or proximal C-terminus between S6 and the A-domain is required for functional interaction between KCNQ2 and KCNQ3; the proximal part of the KCNQ3 C-terminus controls current amplitude and depolarizing shift of activation in chimeric channels.","method":"Chimeric channel construction, Xenopus oocyte expression, electrophysiology","journal":"The Journal of Physiology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — chimeric/mutagenesis approach with functional readout, single lab","pmids":["12640002"],"is_preprint":false},{"year":2004,"finding":"M1 muscarinic receptor-mediated suppression of KCNQ2/KCNQ3 current proceeds through a classical Gq G-protein cycle: Gq/11 (not G13) activation → PLC stimulation → PIP2 hydrolysis → PIP2 dissociation from KCNQ channels, as shown by constitutively active Galpha mutants, RGS2 overexpression, GDPbetaS dialysis, and a PIP2 optical probe.","method":"Whole-cell patch clamp, confocal microscopy with PIP2 optical probe, mutagenesis of G-protein subunits, RGS2 co-expression in tsA-201 cells","journal":"The Journal of General Physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (optical probe, genetics, pharmacology, kinetic modeling) in single rigorous study","pmids":["15173220"],"is_preprint":false},{"year":2005,"finding":"Mass spectrometry of in vivo KCNQ2/KCNQ3 channels identifies two phosphorylation sites: one KCNQ3-specific site in the C-terminal tetramerization domain (functionally silent) and one in the S4-S5 intracellular loop shared by all KCNQs that acts as a mechanism of channel inhibition.","method":"Mass spectrometry, site-directed mutagenesis, electrophysiology","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry identification of in vivo PTM sites combined with mutagenesis and functional validation","pmids":["16319223"],"is_preprint":false},{"year":2006,"finding":"KCNQ2/KCNQ3 channels are preferentially expressed on axonal surfaces including axon initial segments and more distal axon; AIS targeting requires ankyrin-G binding motifs on both KCNQ2 and KCNQ3, while distal axonal targeting requires membrane-proximal and A-domain sequences in KCNQ2 C-terminal tail; several BFNC mutations disrupt surface expression or polarized distribution.","method":"Live imaging of surface-expressed channels in neurons, domain mapping with truncation/chimeras, ankyrin-G binding motif mutagenesis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct imaging with functional domain dissection, multiple BFNC mutations tested, consistent results","pmids":["16735477"],"is_preprint":false},{"year":2007,"finding":"Nedd4-2 ubiquitin ligase (but not Nedd4) directly interacts with KCNQ3 C-terminal region, ubiquitinates KCNQ2/KCNQ3, and reduces K+ current amplitudes of KCNQ2/3 and KCNQ3/5 heteromeric channels; the KCNQ3 C-terminus is required for this regulation.","method":"GST pulldown, co-immunoprecipitation, ubiquitination assay in transfected cells, Xenopus oocyte electrophysiology","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays (GST pulldown + Co-IP) plus functional electrophysiology plus ubiquitination assay","pmids":["17322297"],"is_preprint":false},{"year":2008,"finding":"SGK-1 kinase upregulates KCNQ2/3 and KCNQ3/5 K+ current amplitudes and increases cell surface levels of KCNQ2/3 channels; this effect is kinase-activity dependent and is abrogated by co-expression of Nedd4-2 S448A mutant, suggesting SGK-1 acts via phosphorylation of Nedd4-2 to reduce ubiquitination-mediated channel downregulation.","method":"Xenopus oocyte electrophysiology, surface biotinylation in transfected cells, kinase-dead mutant","journal":"American Journal of Physiology. Cell Physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus surface biotinylation plus kinase mutant, single lab","pmids":["18463232"],"is_preprint":false},{"year":2008,"finding":"KCNQ3 homomers are well-expressed at the plasma membrane but most wild-type channels are functionally silent; the A315 residue in the pore vestibule (alanine in KCNQ3 vs. threonine in other KCNQs) governs this silencing. The A315T mutation unlocks channels into a conductive state by stabilizing a critical pore helix-selectivity filter interaction, increasing current density ~10-fold.","method":"Biotinylation, TIRF imaging, site-directed mutagenesis, homology modeling, electrophysiology","journal":"Biophysical Journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (surface expression assays, mutagenesis, structural modeling, electrophysiology) in single study","pmids":["18790849"],"is_preprint":false},{"year":2008,"finding":"KCNQ3 homomeric channels carrying the BFNC W309R pore-helix mutation lose K+ current; heteromeric KCNQ2/KCNQ3-W309R channels show dominant-negative suppression and altered gating; homology modeling shows the R side chain cannot form hydrogen bonds with the selectivity filter tyrosine.","method":"Patch clamp in HEK293 cells, homology modeling","journal":"The Journal of Membrane Biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct electrophysiology plus structural modeling, single lab","pmids":["18425618"],"is_preprint":false},{"year":2008,"finding":"KCNQ3 and KCNQ2 both contribute to the apamin-insensitive medium afterhyperpolarization (ImAHP) in dentate granule cells (~50% reduction in knockouts), but CA1 pyramidal neurons show no impairment in either single knockout; KCNQ channels also contribute to the slow afterhyperpolarization (IsAHP), with hippocalcin as a potential calcium sensor linking the two processes.","method":"Whole-cell patch clamp in KCNQ3- and KCNQ2-knockout mouse hippocampal neurons, pharmacological manipulation","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus electrophysiology in native neurons, multiple brain regions examined","pmids":["19060215"],"is_preprint":false},{"year":2010,"finding":"Wild-type KCNQ3 expressed alone is retained in the endoplasmic reticulum and requires assembly with KCNQ2 to exit; the A315 pore residue controls ER retention such that the A315T substitution enables efficient plasma membrane trafficking of KCNQ3 independent of KCNQ2, revealing A315 as a molecular checkpoint governing subunit composition of surface M-channels.","method":"Subcellular fractionation, immunofluorescence/confocal microscopy, site-directed mutagenesis, electrophysiology","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with mutagenesis and functional validation, multiple orthogonal methods","pmids":["20610766"],"is_preprint":false},{"year":2012,"finding":"Atomic force microscopy with subunit-specific antibodies demonstrates that Kv7.2/Kv7.3 heteromers assemble as tetramers with predominantly 2:2 stoichiometry and random (non-fixed) subunit arrangement; when DNA ratios are varied, stoichiometry is variable and not fixed.","method":"Atomic force microscopy, immunoaffinity isolation, antibody decoration","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct structural imaging with orthogonal immunochemical approaches","pmids":["22334706"],"is_preprint":false},{"year":2012,"finding":"Pore helix-S6 interactions govern KCNQ3 current amplitudes: mutations at F344 in S6 dramatically decrease currents by disrupting interaction with A315 in the pore helix; this mechanism is more important than C-terminal effects on current amplitude.","method":"Site-directed mutagenesis, TIRF imaging, homology modeling, patch clamp","journal":"Biophysical Journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus structural modeling plus surface expression assay, single lab","pmids":["22713565"],"is_preprint":false},{"year":2012,"finding":"Mutations at position I312 in the pore helix of KCNQ3 (I312E, I312K, I312R) dramatically decrease homomeric and heteromeric KCNQ2/3 currents by locking the selectivity filter in a nonconductive conformation, as supported by homology modeling.","method":"Site-directed mutagenesis, TIRF imaging, patch clamp, homology modeling","journal":"Biophysical Journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus structural modeling plus surface expression assay, single lab","pmids":["22713564"],"is_preprint":false},{"year":2014,"finding":"Conditional deletion of Kcnq2 from cortical pyramidal neurons causes abnormal EEG and early death; loss of KCNQ2 secondarily reduces KCNQ3 and KCNQ5 protein levels, whereas loss of Kcnq3 causes only modest reduction of other KCNQ channels; KCNQ allosteric activators dampen excitability in Kcnq3-null but not Kcnq2-null neurons, demonstrating that KCNQ2 is the obligatory subunit.","method":"Conditional knockout mice, EEG, whole-cell patch clamp, biochemistry (Western blot), pharmacology","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with EEG, electrophysiology, and biochemistry, multiple brain regions","pmids":["24719109"],"is_preprint":false},{"year":2015,"finding":"Gain-of-function mutations in the voltage-sensing domain of Kv7.3 (R230C) stabilize the activated state by disrupting a network of electrostatic interactions with neighboring negatively charged residues in the resting state, confirmed by disulfide trapping; this causes channels to remain open throughout the physiological voltage range and leads to epileptic encephalopathy.","method":"Patch clamp in mammalian cells, multistate structural modeling, disulfide trapping experiments","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology plus structural modeling plus disulfide trapping, multiple mutations tested","pmids":["25740509"],"is_preprint":false},{"year":2015,"finding":"The extra residues in the helix C-D linker of KCNQ3 C-terminus reduce channel surface expression by causing ER retention; deletion of these residues increases KCNQ3 current by increasing plasma membrane expression, as confirmed by TIRF and plasma membrane protein assays.","method":"Site-directed deletion mutagenesis, TIRF imaging, plasma membrane protein assay, confocal microscopy","journal":"PLoS One","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple imaging modalities plus mutagenesis, single lab","pmids":["26692086"],"is_preprint":false},{"year":2017,"finding":"Apo-calmodulin (calcium-independent) differentially regulates PI(4,5)P2 sensitivity of Kv7.2 and Kv7.3: it increases Kv7.2 current density and reduces its PIP2 depletion sensitivity, but has no potentiating effect on Kv7.3 homomers; for Kv7.2/3 heteromers, CaM reduces PI(4,5)P2 sensitivity; this regulation is subunit-specific.","method":"Whole-cell patch clamp, DrVSP-mediated PIP2 depletion, CaM sponge, PI(4)P5-kinase overexpression, CaM1234 mutant","journal":"Frontiers in Molecular Neuroscience","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple pharmacological and genetic manipulations with electrophysiology, single lab","pmids":["28507506"],"is_preprint":false},{"year":2018,"finding":"Two KCNQ3 missense mutations (V359L and D542N) found in compound heterozygosis each decrease PIP2-dependent current regulation with additive effects; the R230C voltage-sensor mutation in KCNQ3 shifts the open/closed gate to very negative potentials, allowing S4 movement while causing constitutive opening; arginine at position 230 governs this through both charge and side chain size.","method":"Patch-clamp recordings, voltage clamp fluorometry, site-directed mutagenesis with natural and unnatural amino acids","journal":"Molecular Neurobiology / The Journal of General Physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — voltage clamp fluorometry plus mutagenesis with unnatural amino acids, mechanistically rigorous","pmids":["29383681","30578330"],"is_preprint":false},{"year":2019,"finding":"A homozygous frameshift KCNQ3 variant (c.1599dup) causes nonsense-mediated mRNA decay, dramatically reduces KCNQ3 protein in patient fibroblasts, and fully abolishes homomeric and KCNQ2/KCNQ3 heteromeric channel function, resulting in severe neonatal-onset pharmacodependent epilepsy and intellectual disability.","method":"Exome sequencing, qRT-PCR, Western blot, immunofluorescence, whole-cell patch clamp electrophysiology","journal":"Epilepsia Open","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (expression + protein + function), single lab but comprehensive characterization","pmids":["31440727"],"is_preprint":false},{"year":2020,"finding":"Kv7.3 is delivered to somatic and axon terminal plasma membranes before diffusing bidirectionally along the axonal membrane until immobilized at the AIS through interaction with AnkyrinG, revealing the trafficking pathway for AIS localization.","method":"Live imaging of fluorescent-tagged Kv7.3 in neurons, FRAP, single-molecule tracking","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct live imaging with multiple tracking approaches, mechanistically informative","pmids":["32903174"],"is_preprint":false},{"year":2020,"finding":"Multiple C-terminal domains of Kv7.3 modulate AIS localization: a membrane proximal domain reduces AIS localization efficiency while helix D increases and stabilizes it; neither domain is absolutely required but both regulate the relative efficiency of AIS targeting.","method":"Chimeric channel expression in cultured hippocampal neurons, confocal microscopy","journal":"Frontiers in Cellular Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chimeric domain mapping with imaging in neurons, single lab","pmids":["32116557"],"is_preprint":false},{"year":2021,"finding":"CRISPR knockdown of Kcnq3 in NPY/AgRP neurons attenuates M-current, increases neuronal depolarization, raises input resistance, and reduces current threshold for action potentials, demonstrating KCNQ3's role in controlling intrinsic excitability of hypothalamic neurons and energy homeostasis (reduced locomotor activity).","method":"AAV-CRISPR in vivo knockdown, single-cell qPCR, whole-cell patch clamp, open-field testing","journal":"Molecular Metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — targeted KD with electrophysiology and behavioral readout, single lab","pmids":["33766732"],"is_preprint":false},{"year":2021,"finding":"Hyper-SUMOylation of Kv7.3 (and Kv7.2) reduces PIP2 binding and inhibits CaM1-mediated assembly; SENP2 deSUMOylase removes SUMO modifications to restore channel assembly and M-current; retigabine reduces SAE1 transcription and inhibits KCNQ3 SUMOylation.","method":"SENP2-deficient mice, co-immunoprecipitation, mutagenesis of SUMOylation sites, patch clamp, Western blot","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO mice plus biochemistry plus functional electrophysiology, single lab","pmids":["34509475"],"is_preprint":false},{"year":2021,"finding":"A gain-of-function missense variant (D755N) in KCNQ3 (Kv7.3) co-expressed with Kv7.2 produces larger M-currents than wild-type Kv7.2/Kv7.3, and dynamic clamp modeling confirmed this reduces DRG neuron excitability, identifying KCNQ3 as a pain resilience factor in peripheral sensory neurons.","method":"Voltage-clamp recordings in heterologous cells, iPSC-derived sensory neurons, dynamic clamp","journal":"Brain Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology plus iPSC neurons plus dynamic clamp, single lab","pmids":["34557669"],"is_preprint":false},{"year":2021,"finding":"In mice lacking Kcnq3, hippocampal pyramidal cell complex spike bursts are less coordinated by the theta rhythm during spatial navigation; place fields of single spikes are smaller; joint activity of medial septal GABAergic and cholinergic inputs (not either alone) is required for burst entrainment.","method":"Kcnq3 knockout mice, in vivo electrophysiology during spatial navigation, optogenetic manipulation of septal inputs","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with in vivo recording plus optogenetic circuit dissection, multiple behavioral paradigms","pmids":["34376649"],"is_preprint":false},{"year":2022,"finding":"KCNQ2 associates with KCNQ5 in native brain channels even in the absence of KCNQ3, as shown by split-intein KCNQ2/5 tandems forming functional channels and mass spectrometry of native complexes, demonstrating that KCNQ channel composition is more diverse than the canonical KCNQ2/3 or KCNQ3/5 model.","method":"Split-intein protein trans-splicing (tandem constructs), heterologous expression electrophysiology, native brain mass spectrometry","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with tandem constructs plus native MS, two orthogonal methods","pmids":["35320039"],"is_preprint":false},{"year":2022,"finding":"Triclosan activates KCNQ3 but not KCNQ2 channels by inducing a voltage shift in activation, increasing conductance, and slowing channel closing; site-directed mutagenesis and molecular docking suggest the binding site is in the voltage sensor domain; the response is PIP2-independent.","method":"Patch clamp, site-directed mutagenesis, molecular docking","journal":"Pflügers Archiv","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis plus molecular docking plus electrophysiology, single lab","pmids":["35459955"],"is_preprint":false},{"year":2024,"finding":"HDAC2 forms a corepressor complex with MeCP2 and Sin3A to transcriptionally repress kcnq2/kcnq3 genes in DRG neurons; upstream, EREG/EGFR-ERK-Runx1 signaling activates HDAC2-mediated transcriptional repression, leading to neuronal hyperexcitability and bone cancer pain.","method":"ChIP, co-IP, qPCR, DRG neuron electrophysiology, in vivo bone cancer pain model","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus co-IP plus functional in vivo data, single lab","pmids":["39192337"],"is_preprint":false},{"year":2024,"finding":"KCNQ3 interacts with GAREM1, GRB2, and SOS1 and activates RAS/RAF/MAPK signaling to promote papillary thyroid cancer cell proliferation and migration; E2 enhances KCNQ3 transcription by ESR1 binding to the KCNQ3 promoter.","method":"Co-immunoprecipitation, mass spectrometry, ChIP-qPCR, wound-healing/transwell assays, xenograft in vivo","journal":"Cancer Cell International","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus MS plus ChIP-qPCR plus functional assays, single lab","pmids":["41250218"],"is_preprint":false},{"year":2025,"finding":"DNMT3a-mediated DNA methylation transcriptionally represses kcnq2/kcnq3 in DRG neurons in bone cancer pain; C/EBPβ activates Dnmt3a transcription; VEGFA/VEGFR2-PI3K-Akt-C/EBPβ signaling is the upstream pathway driving this epigenetic suppression.","method":"In vivo bone cancer pain model, DNMT3a inhibition/knockdown, ChIP, luciferase reporter assays, DRG neuron electrophysiology","journal":"The Journal of Pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus in vivo KD plus electrophysiology, single lab","pmids":["40730259"],"is_preprint":false},{"year":2023,"finding":"GABA directly binds to and activates channels containing KCNQ3 through a specific binding site (W266); mice with mutated KCNQ3 GABA binding site (W266L) show sex-specific behavioral phenotypes including reduced nociception and stress responses, altered lateral habenula and visual cortex activity, demonstrating a non-canonical direct neurotransmitter-channel interaction.","method":"Knock-in mouse model, behavioral testing, neuronal activity measurement","journal":"Frontiers in Molecular Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knock-in mouse with site-specific mutation, behavioral plus neural activity readouts, single lab","pmids":["37305551"],"is_preprint":false},{"year":2024,"finding":"Low-activity mutations in the KCNQ3 subunit affect all 3D dynamics (lateral diffusion and exo/endocytosis) of KCNQ2/3 at the AIS by disrupting interaction with ankyrin-G, coupling channel functionality to AIS trafficking regulation.","method":"Single-molecule and multi-molecule live imaging, endocytosis/exocytosis assays in neurons","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct single-molecule imaging with functional mutations, preprint not yet peer-reviewed","pmids":[],"is_preprint":true}],"current_model":"KCNQ3 (Kv7.3) is a voltage-gated K+ channel subunit that preferentially assembles with KCNQ2 in a 2:2 heterotetramer (and also with KCNQ5) at neuronal axon initial segments and nodes of Ranvier to generate the M-current, a slowly-activating non-inactivating K+ conductance that controls subthreshold neuronal excitability; the KCNQ3 pore residue A315 enforces ER retention of homomers until co-assembly with KCNQ2 enables surface trafficking mediated by AnkyrinG-dependent and membrane-diffusion mechanisms; the channel is suppressed by Gq-PLC-PIP2 hydrolysis downstream of muscarinic and other Gq-coupled receptors, regulated post-translationally by Nedd4-2 ubiquitination (counteracted by SGK-1), SUMOylation (reversed by SENP2), and phosphorylation at defined sites; GABA can directly activate KCNQ3-containing channels through a W266 binding site; and gain-of-function voltage-sensor mutations (e.g., R230C) cause constitutive channel opening leading to epileptic encephalopathy, while loss-of-function mutations reduce M-current and cause neonatal epilepsy."},"narrative":{"mechanistic_narrative":"KCNQ3 (Kv7.3) is a voltage-gated K+ channel subunit that preferentially co-assembles with KCNQ2 into heterotetrameric channels generating the slowly-activating, non-inactivating neuronal M-current that governs subthreshold excitability [PMID:9836639, PMID:9872318]. Atomic force microscopy establishes a predominantly 2:2 KCNQ2/KCNQ3 stoichiometry with non-fixed subunit arrangement, and KCNQ3 also partners with KCNQ5 [PMID:22334706, PMID:17322297], while KCNQ2 can independently associate with KCNQ5, indicating channel composition is more diverse than a single canonical heteromer [PMID:35320039]. Within the heteromer KCNQ3 contributes high open probability and shapes gating, whereas KCNQ2 is the obligatory subunit driving surface expression and excitability control [PMID:11432988, PMID:24719109]. KCNQ3 surface delivery is gated by the pore-vestibule residue A315, which enforces ER retention of homomers until KCNQ2 co-assembly permits trafficking; the A315T substitution unlocks both a conductive pore state and KCNQ2-independent membrane export, and pore helix-S6 contacts (A315-F344, I312) control conductance [PMID:18790849, PMID:20610766, PMID:22713565, PMID:22713564]. Assembled channels are concentrated at axon initial segments via AnkyrinG-dependent immobilization following bidirectional axonal membrane diffusion, with C-terminal domains tuning targeting efficiency [PMID:16735477, PMID:32903174, PMID:32116557]. The M-current is suppressed through a Gq/11-PLC-PIP2 hydrolysis cascade downstream of M1 muscarinic receptors [PMID:15173220, PMID:10684873], and is further tuned post-translationally by Nedd4-2-mediated ubiquitination (opposed by SGK-1), SUMOylation reversed by SENP2, phosphorylation of an S4-S5 loop site shared across KCNQs, and subunit-specific apo-calmodulin modulation of PIP2 sensitivity [PMID:17322297, PMID:18463232, PMID:34509475, PMID:16319223, PMID:28507506]. GABA directly binds and activates KCNQ3-containing channels through a W266 site, a non-canonical neurotransmitter-channel interaction with behavioral consequences [PMID:37305551]. Loss-of-function and dominant-negative pore mutations (W309R) and a homozygous frameshift abolishing channel function cause benign neonatal epilepsy and severe neonatal-onset epileptic encephalopathy, whereas gain-of-function voltage-sensor mutations (R230C) stabilize the activated state to produce constitutive opening and epileptic encephalopathy [PMID:18425618, PMID:31440727, PMID:25740509, PMID:29383681, PMID:30578330]. Beyond neuronal excitability, KCNQ3 controls intrinsic excitability of hypothalamic AgRP neurons and hippocampal theta-coordinated bursting, and is transcriptionally repressed in DRG neurons during cancer pain [PMID:33766732, PMID:34376649, PMID:39192337, PMID:40730259].","teleology":[{"year":1998,"claim":"Established the molecular identity of the long-sought neuronal M-current by showing KCNQ2 and KCNQ3 co-assemble into heteromers reproducing its biophysics and pharmacology.","evidence":"Xenopus oocyte expression, electrophysiology, pharmacology and in situ hybridization; whole-cell patch clamp with mutagenesis","pmids":["9836639","9872318"],"confidence":"High","gaps":["Stoichiometry of the heteromer not yet defined","Surface trafficking mechanism unresolved","In vivo native channel composition not addressed"]},{"year":2000,"claim":"Showed that the dramatic current increase on co-assembly is driven by enhanced surface expression and that muscarinic suppression is independent of Ca2+ and PKC, narrowing the search for the diffusible messenger.","evidence":"Oocyte noise analysis, single-channel recording and surface assays; tsA-201 patch clamp with Ca2+ imaging and pharmacological dissection","pmids":["10788442","10684873"],"confidence":"High","gaps":["Identity of the messenger linking Gq to channels not yet established","Molecular determinants of co-assembly-dependent trafficking unknown"]},{"year":2001,"claim":"Defined the functional division of labor: KCNQ3 sets open probability and conductance while KCNQ2 primarily controls surface expression.","evidence":"Cell-attached and perforated-patch single-channel recordings in CHO cells","pmids":["11432988"],"confidence":"High","gaps":["Structural basis of subunit-specific conductance differences not resolved","Does not address native stoichiometry in neurons"]},{"year":2003,"claim":"Quantified heteromer composition and mapped the C-terminal domains required for KCNQ2/KCNQ3 functional interaction.","evidence":"TEA inhibition with tandem constructs, qPCR, ICC; chimeric channel analysis in oocytes","pmids":["12832524","12640002"],"confidence":"High","gaps":["1:1 stoichiometry estimate later refined by direct imaging","Atomic interface between subunits not defined"]},{"year":2004,"claim":"Resolved the muscarinic suppression mechanism as a Gq/11-PLC-PIP2 hydrolysis cascade that depletes PIP2 from the channel.","evidence":"Patch clamp with PIP2 optical probe, constitutively active Galpha mutants, RGS2 and GDPbetaS in tsA-201 cells","pmids":["15173220"],"confidence":"High","gaps":["Channel PIP2 binding site not mapped here","Quantitative coupling between receptor occupancy and current not fully defined"]},{"year":2005,"claim":"Identified in vivo phosphorylation sites on the assembled channel, including a shared S4-S5 loop site mediating inhibition and a silent KCNQ3 tetramerization-domain site.","evidence":"Mass spectrometry of native channels with mutagenesis and electrophysiology","pmids":["16319223"],"confidence":"High","gaps":["Responsible kinases not identified","Physiological stimulus driving phosphorylation unknown"]},{"year":2006,"claim":"Demonstrated polarized axonal/AIS targeting of M-channels and that AnkyrinG-binding motifs on both subunits are required, linking trafficking defects to BFNC mutations.","evidence":"Live surface imaging, truncation/chimera domain mapping and AnkyrinG-motif mutagenesis in neurons","pmids":["16735477"],"confidence":"High","gaps":["Dynamic trafficking route to the AIS not yet observed","Distal axonal targeting determinants partially defined"]},{"year":2008,"claim":"Defined the A315 pore-vestibule residue as the molecular switch that keeps KCNQ3 homomers electrically silent, with A315T unlocking conduction.","evidence":"Biotinylation, TIRF imaging, mutagenesis, homology modeling and electrophysiology","pmids":["18790849"],"confidence":"High","gaps":["Whether A315 also controls trafficking not yet tested here","Structural model based on homology, not experimental structure"]},{"year":2007,"claim":"Established Nedd4-2 as a direct E3 ligase that ubiquitinates and downregulates KCNQ3-containing channels via its C-terminus, and SGK-1 as a counter-regulator.","evidence":"GST pulldown, Co-IP, ubiquitination assays, oocyte electrophysiology; surface biotinylation with kinase-dead mutants","pmids":["17322297","18463232"],"confidence":"High","gaps":["Endogenous signals controlling Nedd4-2/SGK-1 balance unclear","SGK-1 evidence from single lab"]},{"year":2008,"claim":"Showed in native neurons that KCNQ2 and KCNQ3 contribute to medium afterhyperpolarization in a region-specific manner.","evidence":"Whole-cell patch clamp in Kcnq2- and Kcnq3-knockout mouse hippocampal neurons with pharmacology","pmids":["19060215"],"confidence":"High","gaps":["Mechanism of hippocalcin coupling not resolved","CA1 redundancy not explained"]},{"year":2010,"claim":"Established A315 as an ER-retention checkpoint that enforces KCNQ2-dependent surface delivery of KCNQ3, governing subunit composition of surface M-channels.","evidence":"Subcellular fractionation, confocal imaging, mutagenesis and electrophysiology","pmids":["20610766"],"confidence":"High","gaps":["ER quality-control machinery recognizing A315 not identified","Link to conductance gating function of A315 not fully integrated"]},{"year":2012,"claim":"Directly visualized heteromer architecture as predominantly 2:2 with random subunit arrangement and variable stoichiometry, and refined pore-helix/S6 determinants of current amplitude.","evidence":"Atomic force microscopy with antibody decoration; mutagenesis, TIRF and homology modeling","pmids":["22334706","22713565","22713564"],"confidence":"High","gaps":["Functional consequence of variable stoichiometry in neurons unknown","Pore mechanism inferred from homology models"]},{"year":2014,"claim":"Defined KCNQ2 as the obligatory M-channel subunit in vivo, with KCNQ3 loss producing only modest secondary effects.","evidence":"Conditional knockout mice with EEG, patch clamp, Western blot and KCNQ-activator pharmacology","pmids":["24719109"],"confidence":"High","gaps":["Distinct contribution of KCNQ3 vs KCNQ5 to residual current not fully separated"]},{"year":2015,"claim":"Defined the gain-of-function disease mechanism: voltage-sensor mutation R230C stabilizes the activated state and causes constitutive opening leading to epileptic encephalopathy.","evidence":"Patch clamp, multistate structural modeling and disulfide trapping; helix C-D linker deletion with TIRF","pmids":["25740509","26692086"],"confidence":"High","gaps":["In vivo seizure phenotype of R230C not modeled here","Endogenous regulation of voltage-sensor stability unaddressed"]},{"year":2018,"claim":"Mechanistically separated loss- and gain-of-function disease variants, showing additive PIP2-coupling defects (V359L, D542N) versus constitutive opening from charge/size at R230.","evidence":"Patch clamp, voltage-clamp fluorometry and unnatural-amino-acid mutagenesis","pmids":["29383681","30578330"],"confidence":"High","gaps":["Compound-heterozygous phenotype-genotype mapping limited","Tissue-level consequences not assayed"]},{"year":2019,"claim":"Provided definitive human genetic proof that complete KCNQ3 loss causes severe neonatal-onset pharmacodependent epilepsy with intellectual disability.","evidence":"Exome sequencing, qRT-PCR, Western blot, immunofluorescence and patch clamp from patient material","pmids":["31440727"],"confidence":"High","gaps":["Single family; phenotypic spectrum of biallelic loss not broadly defined"]},{"year":2020,"claim":"Resolved the trafficking route to the AIS, showing Kv7.3 reaches somatic/terminal membrane then diffuses bidirectionally until AnkyrinG immobilizes it, with C-terminal domains tuning efficiency.","evidence":"Live imaging, FRAP and single-molecule tracking in neurons; chimeric domain mapping","pmids":["32903174","32116557"],"confidence":"High","gaps":["Regulation of diffusion-to-trapping transition unclear","C-terminal AIS domain hierarchy from single lab"]},{"year":2021,"claim":"Expanded KCNQ3 physiological roles beyond cortex to hypothalamic energy homeostasis, hippocampal theta-coordinated bursting, and peripheral pain resilience, and defined SUMOylation as a regulator of assembly and PIP2 binding.","evidence":"AAV-CRISPR knockdown with patch clamp and behavior; Kcnq3-KO in vivo recording with optogenetics; iPSC sensory neurons with dynamic clamp; SENP2-deficient mice with biochemistry","pmids":["33766732","34376649","34557669","34509475"],"confidence":"High","gaps":["SUMOylation regulation studied in single lab","D755N pain-resilience variant from single cohort","Circuit basis of theta entrainment incompletely mapped"]},{"year":2022,"claim":"Revealed greater channel compositional diversity (KCNQ2/KCNQ5 without KCNQ3) and identified subunit-selective pharmacology (triclosan activates KCNQ3 via the voltage sensor).","evidence":"Split-intein tandems with native mass spectrometry; patch clamp with mutagenesis and docking","pmids":["35320039","35459955"],"confidence":"High","gaps":["Functional weight of KCNQ2/5 channels in vivo unclear","Triclosan binding site inferred from docking"]},{"year":2023,"claim":"Demonstrated a non-canonical mechanism in which GABA directly binds and activates KCNQ3-containing channels through a W266 site with sex-specific behavioral consequences.","evidence":"W266L knock-in mouse with behavioral testing and neuronal activity measurement","pmids":["37305551"],"confidence":"Medium","gaps":["Direct binding affinity and structural basis not resolved","Single lab"]},{"year":2024,"claim":"Linked KCNQ3 to disease beyond excitability through transcriptional repression in pain (HDAC2/MeCP2/Sin3A) and a proliferative RAS/MAPK signaling role in thyroid cancer.","evidence":"ChIP and Co-IP with DRG electrophysiology and in vivo pain model; Co-IP/MS, ChIP-qPCR and xenograft assays","pmids":["39192337","41250218"],"confidence":"Medium","gaps":["Channel-independent vs channel-dependent contributions to cancer signaling unclear","Single-lab findings"]},{"year":2025,"claim":"Defined DNMT3a-mediated DNA methylation as an additional epigenetic route repressing kcnq2/kcnq3 in cancer pain, downstream of VEGFA-PI3K-Akt-C/EBPbeta signaling.","evidence":"In vivo bone cancer pain model, DNMT3a knockdown, ChIP, luciferase reporters and DRG electrophysiology","pmids":["40730259"],"confidence":"Medium","gaps":["Convergence with HDAC2 repression pathway not integrated","Single lab"]},{"year":null,"claim":"How channel functionality, AIS trafficking dynamics, and the regulatory PTM network (SUMOylation, ubiquitination, phosphorylation, calmodulin) are coordinated at single-molecule resolution in living neurons remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experimental atomic structure of KCNQ3-containing channels in the timeline","Integration of PTM regulation with native trafficking not established","Coupling of low-activity mutations to AIS diffusion based on preprint only"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,24,27]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[11,26]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,13,16]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[19,25]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,18,34]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,2]}],"complexes":["KCNQ2/KCNQ3 heterotetramer (M-channel)","KCNQ3/KCNQ5 heteromer"],"partners":["KCNQ2","KCNQ5","KCNE2","NEDD4L","SGK1","ANKYRING","CALMODULIN","GRB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O43525","full_name":"Potassium voltage-gated channel subfamily KQT member 3","aliases":["KQT-like 3","Potassium channel subunit alpha KvLQT3","Voltage-gated potassium channel subunit Kv7.3"],"length_aa":872,"mass_kda":96.7,"function":"Pore-forming subunit of the voltage-gated potassium (Kv) M-channel which is responsible for the M-current, a key controller of neuronal excitability (PubMed:16319223, PubMed:27564677, PubMed:28793216, PubMed:9872318). M-channel is composed of pore-forming subunits KCNQ2 and KCNQ3 assembled as heterotetramers (PubMed:14534157, PubMed:16319223, PubMed:27564677, PubMed:9872318). The native M-current has a slowly activating and deactivating potassium conductance which plays a critical role in determining the subthreshold electrical excitability of neurons as well as the responsiveness to synaptic inputs (PubMed:14534157, PubMed:16319223, PubMed:28793216). M-channel is selectively permeable in vitro to other cations besides potassium, in decreasing order of affinity K(+) > Rb(+) > Cs(+) > Na(+) (PubMed:28793216). M-channel association with SLC5A3/SMIT1 alters channel ion selectivity, increasing Na(+) and Cs(+) permeation relative to K(+) (PubMed:28793216). Suppressed by activation of M1 muscarinic acetylcholine receptors (PubMed:10713961). KCNQ3 also associates with KCNQ5 to form a functional channel in vitro and may also contribute to the M-current in brain (PubMed:11159685)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/O43525/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNQ3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNQ3","total_profiled":1310},"omim":[{"mim_id":"615583","title":"VERHEIJ SYNDROME; VRJS","url":"https://www.omim.org/entry/615583"},{"mim_id":"609145","title":"NEUROFASCIN; NFASC","url":"https://www.omim.org/entry/609145"},{"mim_id":"607357","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, KQT-LIKE SUBFAMILY, MEMBER 5; KCNQ5","url":"https://www.omim.org/entry/607357"},{"mim_id":"603537","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, KQT-LIKE SUBFAMILY, MEMBER 4; KCNQ4","url":"https://www.omim.org/entry/603537"},{"mim_id":"602235","title":"POTASSIUM CHANNEL, VOLTAGE-GATED, KQT-LIKE SUBFAMILY, MEMBER 2; KCNQ2","url":"https://www.omim.org/entry/602235"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":15.7}],"url":"https://www.proteinatlas.org/search/KCNQ3"},"hgnc":{"alias_symbol":["Kv7.3"],"prev_symbol":["EBN2"]},"alphafold":{"accession":"O43525","domains":[{"cath_id":"1.20.120.350","chopping":"100-244","consensus_level":"high","plddt":84.1778,"start":100,"end":244},{"cath_id":"1.10.287.70","chopping":"253-367","consensus_level":"high","plddt":88.5915,"start":253,"end":367},{"cath_id":"-","chopping":"541-571_621-654","consensus_level":"medium","plddt":70.6125,"start":541,"end":654},{"cath_id":"1.10.287","chopping":"369-404_517-540","consensus_level":"medium","plddt":78.1003,"start":369,"end":540}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43525","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43525-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43525-F1-predicted_aligned_error_v6.png","plddt_mean":56.72},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNQ3","jax_strain_url":"https://www.jax.org/strain/search?query=KCNQ3"},"sequence":{"accession":"O43525","fasta_url":"https://rest.uniprot.org/uniprotkb/O43525.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43525/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43525"}},"corpus_meta":[{"pmid":"9836639","id":"PMC_9836639","title":"KCNQ2 and KCNQ3 potassium channel subunits: molecular correlates of the M-channel.","date":"1998","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/9836639","citation_count":1068,"is_preprint":false},{"pmid":"9872318","id":"PMC_9872318","title":"Moderate loss of function of cyclic-AMP-modulated KCNQ2/KCNQ3 K+ channels causes epilepsy.","date":"1998","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/9872318","citation_count":441,"is_preprint":false},{"pmid":"14534157","id":"PMC_14534157","title":"KCNQ2 and KCNQ3 potassium channel genes in benign familial neonatal convulsions: expansion of the functional and mutation spectrum.","date":"2003","source":"Brain : a journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/14534157","citation_count":230,"is_preprint":false},{"pmid":"10684873","id":"PMC_10684873","title":"Reconstitution of muscarinic modulation of the KCNQ2/KCNQ3 K(+) channels that underlie the neuronal M current.","date":"2000","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10684873","citation_count":174,"is_preprint":false},{"pmid":"16735477","id":"PMC_16735477","title":"Polarized axonal surface expression of neuronal KCNQ channels is mediated by multiple signals in the KCNQ2 and KCNQ3 C-terminal domains.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16735477","citation_count":159,"is_preprint":false},{"pmid":"25740509","id":"PMC_25740509","title":"Early-onset epileptic encephalopathy caused by gain-of-function mutations in the voltage sensor of Kv7.2 and Kv7.3 potassium channel subunits.","date":"2015","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/25740509","citation_count":156,"is_preprint":false},{"pmid":"10788442","id":"PMC_10788442","title":"Surface expression and single channel properties of KCNQ2/KCNQ3, M-type K+ channels involved in epilepsy.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10788442","citation_count":141,"is_preprint":false},{"pmid":"9827540","id":"PMC_9827540","title":"The KCNQ2 potassium channel: splice variants, functional and developmental expression. 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KCNQ2/KCNQ3 currents are increased by intracellular cyclic AMP via a phosphorylation site on KCNQ2's amino terminus; BFNC mutations cause loss of function without dominant-negative effect on heteromers.\",\n      \"method\": \"Xenopus oocyte expression, whole-cell patch clamp, site-directed mutagenesis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, replicated in multiple labs\",\n      \"pmids\": [\"9872318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Muscarinic modulation of KCNQ2/KCNQ3 heteromeric channels reconstituted with M1 receptors mirrors native M-current modulation; modulation is not blocked by Ca2+ chelation or broad-spectrum PKC inhibition (staurosporine), ruling out Ca2+ and protein kinases as diffusible messengers; both homomeric KCNQ2 and KCNQ3 subunits are individually susceptible to oxo-M modulation.\",\n      \"method\": \"Whole-cell patch clamp, indo-1 Ca2+ imaging, pharmacological dissection in tsA-201 cells\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with cloned components plus multiple pharmacological controls, replicated by subsequent studies\",\n      \"pmids\": [\"10684873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Co-expression of KCNQ2 and KCNQ3 increases surface expression of both subunits (KCNQ2 ~5-fold, KCNQ3 >10-fold), and the current increase upon co-expression is predominantly due to increased surface expression; a truncated KCNQ2 BFNC mutant fails to reach the surface and fails to stimulate KCNQ3 surface expression.\",\n      \"method\": \"Xenopus oocyte expression, noise analysis, single-channel recordings, surface expression assays\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (noise analysis, single-channel, surface expression), clear mechanistic conclusion\",\n      \"pmids\": [\"10788442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A novel KCNQ3 pore-loop mutation (W309R) causes BFNC2 by disrupting the conserved tryptophan in the P-loop that holds the channel pore open.\",\n      \"method\": \"Sequencing, co-segregation analysis, functional inference from conserved pore residue\",\n      \"journal\": \"Annals of Neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — human genetics plus sequence conservation argument; electrophysiological confirmation provided later by other papers\",\n      \"pmids\": [\"10852552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"KCNE2 (MinK-related peptide 1) associates with KCNQ2 and/or KCNQ3 subunits in brain and, when co-expressed in COS cells, accelerates deactivation kinetics of KCNQ2 and the KCNQ2/KCNQ3 complex.\",\n      \"method\": \"Co-immunoprecipitation, transient transfection, electrophysiology\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus functional electrophysiology in a single lab, single study\",\n      \"pmids\": [\"11034315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Single-channel recordings show that homomeric KCNQ3 channels have the same slope conductance (~9 pS) as KCNQ2/KCNQ3 heteromers but higher open probability, while KCNQ2 homomers have lower conductance and open probability; KCNQ2 is thus primarily responsible for surface expression and KCNQ3 for modifying channel function.\",\n      \"method\": \"Cell-attached patch clamp, perforated-patch whole-cell recordings in CHO cells\",\n      \"journal\": \"The Journal of Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct single-channel recordings with rigorous biophysical characterization\",\n      \"pmids\": [\"11432988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"KCNQ3 antibodies confirm KCNQ2 and KCNQ3 subunits are present at SCG and hippocampal neurons; N-ethylmaleimide augments KCNQ2 but not KCNQ3 currents through a cysteine at position C242 of KCNQ2, localizing a pharmacological action to KCNQ2.\",\n      \"method\": \"Specific antibody labeling, site-directed mutagenesis, patch clamp in tsA-201 cells and SCG neurons\",\n      \"journal\": \"British Journal of Pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus antibody labeling, single lab\",\n      \"pmids\": [\"12466226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A BFNC KCNQ2 mutation (R214W) in the S4 voltage-sensing domain causes slower channel opening, faster closing, and decreased voltage sensitivity without reducing maximal current or surface expression, demonstrating that gating alterations (not just reduced current) can cause neonatal epilepsy.\",\n      \"method\": \"Patch-clamp electrophysiology of heteromeric KCNQ2/KCNQ3 channels in mammalian cells\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct electrophysiology with defined gating parameters, single lab\",\n      \"pmids\": [\"11784811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"KCNQ2 and KCNQ3 co-express with 1:1 stoichiometry in CHO cells and in native SCG neurons, as determined by TEA block curves compared against a KCNQ3/2 tandem construct.\",\n      \"method\": \"TEA concentration-inhibition analysis, tandem-construct pharmacology, quantitative PCR, immunocytochemistry\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal approaches (pharmacology, tandem constructs, qPCR, ICC) in native and heterologous systems\",\n      \"pmids\": [\"12832524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The C-terminal A-domain (~80 amino acids) plus either the B-domain or proximal C-terminus between S6 and the A-domain is required for functional interaction between KCNQ2 and KCNQ3; the proximal part of the KCNQ3 C-terminus controls current amplitude and depolarizing shift of activation in chimeric channels.\",\n      \"method\": \"Chimeric channel construction, Xenopus oocyte expression, electrophysiology\",\n      \"journal\": \"The Journal of Physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — chimeric/mutagenesis approach with functional readout, single lab\",\n      \"pmids\": [\"12640002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"M1 muscarinic receptor-mediated suppression of KCNQ2/KCNQ3 current proceeds through a classical Gq G-protein cycle: Gq/11 (not G13) activation → PLC stimulation → PIP2 hydrolysis → PIP2 dissociation from KCNQ channels, as shown by constitutively active Galpha mutants, RGS2 overexpression, GDPbetaS dialysis, and a PIP2 optical probe.\",\n      \"method\": \"Whole-cell patch clamp, confocal microscopy with PIP2 optical probe, mutagenesis of G-protein subunits, RGS2 co-expression in tsA-201 cells\",\n      \"journal\": \"The Journal of General Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (optical probe, genetics, pharmacology, kinetic modeling) in single rigorous study\",\n      \"pmids\": [\"15173220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mass spectrometry of in vivo KCNQ2/KCNQ3 channels identifies two phosphorylation sites: one KCNQ3-specific site in the C-terminal tetramerization domain (functionally silent) and one in the S4-S5 intracellular loop shared by all KCNQs that acts as a mechanism of channel inhibition.\",\n      \"method\": \"Mass spectrometry, site-directed mutagenesis, electrophysiology\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry identification of in vivo PTM sites combined with mutagenesis and functional validation\",\n      \"pmids\": [\"16319223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"KCNQ2/KCNQ3 channels are preferentially expressed on axonal surfaces including axon initial segments and more distal axon; AIS targeting requires ankyrin-G binding motifs on both KCNQ2 and KCNQ3, while distal axonal targeting requires membrane-proximal and A-domain sequences in KCNQ2 C-terminal tail; several BFNC mutations disrupt surface expression or polarized distribution.\",\n      \"method\": \"Live imaging of surface-expressed channels in neurons, domain mapping with truncation/chimeras, ankyrin-G binding motif mutagenesis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct imaging with functional domain dissection, multiple BFNC mutations tested, consistent results\",\n      \"pmids\": [\"16735477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nedd4-2 ubiquitin ligase (but not Nedd4) directly interacts with KCNQ3 C-terminal region, ubiquitinates KCNQ2/KCNQ3, and reduces K+ current amplitudes of KCNQ2/3 and KCNQ3/5 heteromeric channels; the KCNQ3 C-terminus is required for this regulation.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, ubiquitination assay in transfected cells, Xenopus oocyte electrophysiology\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays (GST pulldown + Co-IP) plus functional electrophysiology plus ubiquitination assay\",\n      \"pmids\": [\"17322297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SGK-1 kinase upregulates KCNQ2/3 and KCNQ3/5 K+ current amplitudes and increases cell surface levels of KCNQ2/3 channels; this effect is kinase-activity dependent and is abrogated by co-expression of Nedd4-2 S448A mutant, suggesting SGK-1 acts via phosphorylation of Nedd4-2 to reduce ubiquitination-mediated channel downregulation.\",\n      \"method\": \"Xenopus oocyte electrophysiology, surface biotinylation in transfected cells, kinase-dead mutant\",\n      \"journal\": \"American Journal of Physiology. Cell Physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus surface biotinylation plus kinase mutant, single lab\",\n      \"pmids\": [\"18463232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KCNQ3 homomers are well-expressed at the plasma membrane but most wild-type channels are functionally silent; the A315 residue in the pore vestibule (alanine in KCNQ3 vs. threonine in other KCNQs) governs this silencing. The A315T mutation unlocks channels into a conductive state by stabilizing a critical pore helix-selectivity filter interaction, increasing current density ~10-fold.\",\n      \"method\": \"Biotinylation, TIRF imaging, site-directed mutagenesis, homology modeling, electrophysiology\",\n      \"journal\": \"Biophysical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (surface expression assays, mutagenesis, structural modeling, electrophysiology) in single study\",\n      \"pmids\": [\"18790849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KCNQ3 homomeric channels carrying the BFNC W309R pore-helix mutation lose K+ current; heteromeric KCNQ2/KCNQ3-W309R channels show dominant-negative suppression and altered gating; homology modeling shows the R side chain cannot form hydrogen bonds with the selectivity filter tyrosine.\",\n      \"method\": \"Patch clamp in HEK293 cells, homology modeling\",\n      \"journal\": \"The Journal of Membrane Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct electrophysiology plus structural modeling, single lab\",\n      \"pmids\": [\"18425618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KCNQ3 and KCNQ2 both contribute to the apamin-insensitive medium afterhyperpolarization (ImAHP) in dentate granule cells (~50% reduction in knockouts), but CA1 pyramidal neurons show no impairment in either single knockout; KCNQ channels also contribute to the slow afterhyperpolarization (IsAHP), with hippocalcin as a potential calcium sensor linking the two processes.\",\n      \"method\": \"Whole-cell patch clamp in KCNQ3- and KCNQ2-knockout mouse hippocampal neurons, pharmacological manipulation\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus electrophysiology in native neurons, multiple brain regions examined\",\n      \"pmids\": [\"19060215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Wild-type KCNQ3 expressed alone is retained in the endoplasmic reticulum and requires assembly with KCNQ2 to exit; the A315 pore residue controls ER retention such that the A315T substitution enables efficient plasma membrane trafficking of KCNQ3 independent of KCNQ2, revealing A315 as a molecular checkpoint governing subunit composition of surface M-channels.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence/confocal microscopy, site-directed mutagenesis, electrophysiology\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with mutagenesis and functional validation, multiple orthogonal methods\",\n      \"pmids\": [\"20610766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Atomic force microscopy with subunit-specific antibodies demonstrates that Kv7.2/Kv7.3 heteromers assemble as tetramers with predominantly 2:2 stoichiometry and random (non-fixed) subunit arrangement; when DNA ratios are varied, stoichiometry is variable and not fixed.\",\n      \"method\": \"Atomic force microscopy, immunoaffinity isolation, antibody decoration\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct structural imaging with orthogonal immunochemical approaches\",\n      \"pmids\": [\"22334706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Pore helix-S6 interactions govern KCNQ3 current amplitudes: mutations at F344 in S6 dramatically decrease currents by disrupting interaction with A315 in the pore helix; this mechanism is more important than C-terminal effects on current amplitude.\",\n      \"method\": \"Site-directed mutagenesis, TIRF imaging, homology modeling, patch clamp\",\n      \"journal\": \"Biophysical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus structural modeling plus surface expression assay, single lab\",\n      \"pmids\": [\"22713565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mutations at position I312 in the pore helix of KCNQ3 (I312E, I312K, I312R) dramatically decrease homomeric and heteromeric KCNQ2/3 currents by locking the selectivity filter in a nonconductive conformation, as supported by homology modeling.\",\n      \"method\": \"Site-directed mutagenesis, TIRF imaging, patch clamp, homology modeling\",\n      \"journal\": \"Biophysical Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus structural modeling plus surface expression assay, single lab\",\n      \"pmids\": [\"22713564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Conditional deletion of Kcnq2 from cortical pyramidal neurons causes abnormal EEG and early death; loss of KCNQ2 secondarily reduces KCNQ3 and KCNQ5 protein levels, whereas loss of Kcnq3 causes only modest reduction of other KCNQ channels; KCNQ allosteric activators dampen excitability in Kcnq3-null but not Kcnq2-null neurons, demonstrating that KCNQ2 is the obligatory subunit.\",\n      \"method\": \"Conditional knockout mice, EEG, whole-cell patch clamp, biochemistry (Western blot), pharmacology\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with EEG, electrophysiology, and biochemistry, multiple brain regions\",\n      \"pmids\": [\"24719109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Gain-of-function mutations in the voltage-sensing domain of Kv7.3 (R230C) stabilize the activated state by disrupting a network of electrostatic interactions with neighboring negatively charged residues in the resting state, confirmed by disulfide trapping; this causes channels to remain open throughout the physiological voltage range and leads to epileptic encephalopathy.\",\n      \"method\": \"Patch clamp in mammalian cells, multistate structural modeling, disulfide trapping experiments\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology plus structural modeling plus disulfide trapping, multiple mutations tested\",\n      \"pmids\": [\"25740509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The extra residues in the helix C-D linker of KCNQ3 C-terminus reduce channel surface expression by causing ER retention; deletion of these residues increases KCNQ3 current by increasing plasma membrane expression, as confirmed by TIRF and plasma membrane protein assays.\",\n      \"method\": \"Site-directed deletion mutagenesis, TIRF imaging, plasma membrane protein assay, confocal microscopy\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple imaging modalities plus mutagenesis, single lab\",\n      \"pmids\": [\"26692086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Apo-calmodulin (calcium-independent) differentially regulates PI(4,5)P2 sensitivity of Kv7.2 and Kv7.3: it increases Kv7.2 current density and reduces its PIP2 depletion sensitivity, but has no potentiating effect on Kv7.3 homomers; for Kv7.2/3 heteromers, CaM reduces PI(4,5)P2 sensitivity; this regulation is subunit-specific.\",\n      \"method\": \"Whole-cell patch clamp, DrVSP-mediated PIP2 depletion, CaM sponge, PI(4)P5-kinase overexpression, CaM1234 mutant\",\n      \"journal\": \"Frontiers in Molecular Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple pharmacological and genetic manipulations with electrophysiology, single lab\",\n      \"pmids\": [\"28507506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Two KCNQ3 missense mutations (V359L and D542N) found in compound heterozygosis each decrease PIP2-dependent current regulation with additive effects; the R230C voltage-sensor mutation in KCNQ3 shifts the open/closed gate to very negative potentials, allowing S4 movement while causing constitutive opening; arginine at position 230 governs this through both charge and side chain size.\",\n      \"method\": \"Patch-clamp recordings, voltage clamp fluorometry, site-directed mutagenesis with natural and unnatural amino acids\",\n      \"journal\": \"Molecular Neurobiology / The Journal of General Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — voltage clamp fluorometry plus mutagenesis with unnatural amino acids, mechanistically rigorous\",\n      \"pmids\": [\"29383681\", \"30578330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous frameshift KCNQ3 variant (c.1599dup) causes nonsense-mediated mRNA decay, dramatically reduces KCNQ3 protein in patient fibroblasts, and fully abolishes homomeric and KCNQ2/KCNQ3 heteromeric channel function, resulting in severe neonatal-onset pharmacodependent epilepsy and intellectual disability.\",\n      \"method\": \"Exome sequencing, qRT-PCR, Western blot, immunofluorescence, whole-cell patch clamp electrophysiology\",\n      \"journal\": \"Epilepsia Open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (expression + protein + function), single lab but comprehensive characterization\",\n      \"pmids\": [\"31440727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Kv7.3 is delivered to somatic and axon terminal plasma membranes before diffusing bidirectionally along the axonal membrane until immobilized at the AIS through interaction with AnkyrinG, revealing the trafficking pathway for AIS localization.\",\n      \"method\": \"Live imaging of fluorescent-tagged Kv7.3 in neurons, FRAP, single-molecule tracking\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live imaging with multiple tracking approaches, mechanistically informative\",\n      \"pmids\": [\"32903174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Multiple C-terminal domains of Kv7.3 modulate AIS localization: a membrane proximal domain reduces AIS localization efficiency while helix D increases and stabilizes it; neither domain is absolutely required but both regulate the relative efficiency of AIS targeting.\",\n      \"method\": \"Chimeric channel expression in cultured hippocampal neurons, confocal microscopy\",\n      \"journal\": \"Frontiers in Cellular Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chimeric domain mapping with imaging in neurons, single lab\",\n      \"pmids\": [\"32116557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRISPR knockdown of Kcnq3 in NPY/AgRP neurons attenuates M-current, increases neuronal depolarization, raises input resistance, and reduces current threshold for action potentials, demonstrating KCNQ3's role in controlling intrinsic excitability of hypothalamic neurons and energy homeostasis (reduced locomotor activity).\",\n      \"method\": \"AAV-CRISPR in vivo knockdown, single-cell qPCR, whole-cell patch clamp, open-field testing\",\n      \"journal\": \"Molecular Metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — targeted KD with electrophysiology and behavioral readout, single lab\",\n      \"pmids\": [\"33766732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Hyper-SUMOylation of Kv7.3 (and Kv7.2) reduces PIP2 binding and inhibits CaM1-mediated assembly; SENP2 deSUMOylase removes SUMO modifications to restore channel assembly and M-current; retigabine reduces SAE1 transcription and inhibits KCNQ3 SUMOylation.\",\n      \"method\": \"SENP2-deficient mice, co-immunoprecipitation, mutagenesis of SUMOylation sites, patch clamp, Western blot\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO mice plus biochemistry plus functional electrophysiology, single lab\",\n      \"pmids\": [\"34509475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A gain-of-function missense variant (D755N) in KCNQ3 (Kv7.3) co-expressed with Kv7.2 produces larger M-currents than wild-type Kv7.2/Kv7.3, and dynamic clamp modeling confirmed this reduces DRG neuron excitability, identifying KCNQ3 as a pain resilience factor in peripheral sensory neurons.\",\n      \"method\": \"Voltage-clamp recordings in heterologous cells, iPSC-derived sensory neurons, dynamic clamp\",\n      \"journal\": \"Brain Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology plus iPSC neurons plus dynamic clamp, single lab\",\n      \"pmids\": [\"34557669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In mice lacking Kcnq3, hippocampal pyramidal cell complex spike bursts are less coordinated by the theta rhythm during spatial navigation; place fields of single spikes are smaller; joint activity of medial septal GABAergic and cholinergic inputs (not either alone) is required for burst entrainment.\",\n      \"method\": \"Kcnq3 knockout mice, in vivo electrophysiology during spatial navigation, optogenetic manipulation of septal inputs\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with in vivo recording plus optogenetic circuit dissection, multiple behavioral paradigms\",\n      \"pmids\": [\"34376649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KCNQ2 associates with KCNQ5 in native brain channels even in the absence of KCNQ3, as shown by split-intein KCNQ2/5 tandems forming functional channels and mass spectrometry of native complexes, demonstrating that KCNQ channel composition is more diverse than the canonical KCNQ2/3 or KCNQ3/5 model.\",\n      \"method\": \"Split-intein protein trans-splicing (tandem constructs), heterologous expression electrophysiology, native brain mass spectrometry\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with tandem constructs plus native MS, two orthogonal methods\",\n      \"pmids\": [\"35320039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Triclosan activates KCNQ3 but not KCNQ2 channels by inducing a voltage shift in activation, increasing conductance, and slowing channel closing; site-directed mutagenesis and molecular docking suggest the binding site is in the voltage sensor domain; the response is PIP2-independent.\",\n      \"method\": \"Patch clamp, site-directed mutagenesis, molecular docking\",\n      \"journal\": \"Pflügers Archiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis plus molecular docking plus electrophysiology, single lab\",\n      \"pmids\": [\"35459955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HDAC2 forms a corepressor complex with MeCP2 and Sin3A to transcriptionally repress kcnq2/kcnq3 genes in DRG neurons; upstream, EREG/EGFR-ERK-Runx1 signaling activates HDAC2-mediated transcriptional repression, leading to neuronal hyperexcitability and bone cancer pain.\",\n      \"method\": \"ChIP, co-IP, qPCR, DRG neuron electrophysiology, in vivo bone cancer pain model\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus co-IP plus functional in vivo data, single lab\",\n      \"pmids\": [\"39192337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KCNQ3 interacts with GAREM1, GRB2, and SOS1 and activates RAS/RAF/MAPK signaling to promote papillary thyroid cancer cell proliferation and migration; E2 enhances KCNQ3 transcription by ESR1 binding to the KCNQ3 promoter.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ChIP-qPCR, wound-healing/transwell assays, xenograft in vivo\",\n      \"journal\": \"Cancer Cell International\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus MS plus ChIP-qPCR plus functional assays, single lab\",\n      \"pmids\": [\"41250218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNMT3a-mediated DNA methylation transcriptionally represses kcnq2/kcnq3 in DRG neurons in bone cancer pain; C/EBPβ activates Dnmt3a transcription; VEGFA/VEGFR2-PI3K-Akt-C/EBPβ signaling is the upstream pathway driving this epigenetic suppression.\",\n      \"method\": \"In vivo bone cancer pain model, DNMT3a inhibition/knockdown, ChIP, luciferase reporter assays, DRG neuron electrophysiology\",\n      \"journal\": \"The Journal of Pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus in vivo KD plus electrophysiology, single lab\",\n      \"pmids\": [\"40730259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GABA directly binds to and activates channels containing KCNQ3 through a specific binding site (W266); mice with mutated KCNQ3 GABA binding site (W266L) show sex-specific behavioral phenotypes including reduced nociception and stress responses, altered lateral habenula and visual cortex activity, demonstrating a non-canonical direct neurotransmitter-channel interaction.\",\n      \"method\": \"Knock-in mouse model, behavioral testing, neuronal activity measurement\",\n      \"journal\": \"Frontiers in Molecular Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse with site-specific mutation, behavioral plus neural activity readouts, single lab\",\n      \"pmids\": [\"37305551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Low-activity mutations in the KCNQ3 subunit affect all 3D dynamics (lateral diffusion and exo/endocytosis) of KCNQ2/3 at the AIS by disrupting interaction with ankyrin-G, coupling channel functionality to AIS trafficking regulation.\",\n      \"method\": \"Single-molecule and multi-molecule live imaging, endocytosis/exocytosis assays in neurons\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct single-molecule imaging with functional mutations, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"KCNQ3 (Kv7.3) is a voltage-gated K+ channel subunit that preferentially assembles with KCNQ2 in a 2:2 heterotetramer (and also with KCNQ5) at neuronal axon initial segments and nodes of Ranvier to generate the M-current, a slowly-activating non-inactivating K+ conductance that controls subthreshold neuronal excitability; the KCNQ3 pore residue A315 enforces ER retention of homomers until co-assembly with KCNQ2 enables surface trafficking mediated by AnkyrinG-dependent and membrane-diffusion mechanisms; the channel is suppressed by Gq-PLC-PIP2 hydrolysis downstream of muscarinic and other Gq-coupled receptors, regulated post-translationally by Nedd4-2 ubiquitination (counteracted by SGK-1), SUMOylation (reversed by SENP2), and phosphorylation at defined sites; GABA can directly activate KCNQ3-containing channels through a W266 binding site; and gain-of-function voltage-sensor mutations (e.g., R230C) cause constitutive channel opening leading to epileptic encephalopathy, while loss-of-function mutations reduce M-current and cause neonatal epilepsy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNQ3 (Kv7.3) is a voltage-gated K+ channel subunit that preferentially co-assembles with KCNQ2 into heterotetrameric channels generating the slowly-activating, non-inactivating neuronal M-current that governs subthreshold excitability [#0, #1]. Atomic force microscopy establishes a predominantly 2:2 KCNQ2/KCNQ3 stoichiometry with non-fixed subunit arrangement, and KCNQ3 also partners with KCNQ5 [#20, #14], while KCNQ2 can independently associate with KCNQ5, indicating channel composition is more diverse than a single canonical heteromer [#35]. Within the heteromer KCNQ3 contributes high open probability and shapes gating, whereas KCNQ2 is the obligatory subunit driving surface expression and excitability control [#6, #23]. KCNQ3 surface delivery is gated by the pore-vestibule residue A315, which enforces ER retention of homomers until KCNQ2 co-assembly permits trafficking; the A315T substitution unlocks both a conductive pore state and KCNQ2-independent membrane export, and pore helix-S6 contacts (A315-F344, I312) control conductance [#16, #19, #21, #22]. Assembled channels are concentrated at axon initial segments via AnkyrinG-dependent immobilization following bidirectional axonal membrane diffusion, with C-terminal domains tuning targeting efficiency [#13, #29, #30]. The M-current is suppressed through a Gq/11-PLC-PIP2 hydrolysis cascade downstream of M1 muscarinic receptors [#11, #2], and is further tuned post-translationally by Nedd4-2-mediated ubiquitination (opposed by SGK-1), SUMOylation reversed by SENP2, phosphorylation of an S4-S5 loop site shared across KCNQs, and subunit-specific apo-calmodulin modulation of PIP2 sensitivity [#14, #15, #32, #12, #26]. GABA directly binds and activates KCNQ3-containing channels through a W266 site, a non-canonical neurotransmitter-channel interaction with behavioral consequences [#40]. Loss-of-function and dominant-negative pore mutations (W309R) and a homozygous frameshift abolishing channel function cause benign neonatal epilepsy and severe neonatal-onset epileptic encephalopathy, whereas gain-of-function voltage-sensor mutations (R230C) stabilize the activated state to produce constitutive opening and epileptic encephalopathy [#17, #28, #24, #27]. Beyond neuronal excitability, KCNQ3 controls intrinsic excitability of hypothalamic AgRP neurons and hippocampal theta-coordinated bursting, and is transcriptionally repressed in DRG neurons during cancer pain [#31, #34, #37, #39].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the molecular identity of the long-sought neuronal M-current by showing KCNQ2 and KCNQ3 co-assemble into heteromers reproducing its biophysics and pharmacology.\",\n      \"evidence\": \"Xenopus oocyte expression, electrophysiology, pharmacology and in situ hybridization; whole-cell patch clamp with mutagenesis\",\n      \"pmids\": [\"9836639\", \"9872318\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the heteromer not yet defined\", \"Surface trafficking mechanism unresolved\", \"In vivo native channel composition not addressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed that the dramatic current increase on co-assembly is driven by enhanced surface expression and that muscarinic suppression is independent of Ca2+ and PKC, narrowing the search for the diffusible messenger.\",\n      \"evidence\": \"Oocyte noise analysis, single-channel recording and surface assays; tsA-201 patch clamp with Ca2+ imaging and pharmacological dissection\",\n      \"pmids\": [\"10788442\", \"10684873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the messenger linking Gq to channels not yet established\", \"Molecular determinants of co-assembly-dependent trafficking unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the functional division of labor: KCNQ3 sets open probability and conductance while KCNQ2 primarily controls surface expression.\",\n      \"evidence\": \"Cell-attached and perforated-patch single-channel recordings in CHO cells\",\n      \"pmids\": [\"11432988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of subunit-specific conductance differences not resolved\", \"Does not address native stoichiometry in neurons\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Quantified heteromer composition and mapped the C-terminal domains required for KCNQ2/KCNQ3 functional interaction.\",\n      \"evidence\": \"TEA inhibition with tandem constructs, qPCR, ICC; chimeric channel analysis in oocytes\",\n      \"pmids\": [\"12832524\", \"12640002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"1:1 stoichiometry estimate later refined by direct imaging\", \"Atomic interface between subunits not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the muscarinic suppression mechanism as a Gq/11-PLC-PIP2 hydrolysis cascade that depletes PIP2 from the channel.\",\n      \"evidence\": \"Patch clamp with PIP2 optical probe, constitutively active Galpha mutants, RGS2 and GDPbetaS in tsA-201 cells\",\n      \"pmids\": [\"15173220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Channel PIP2 binding site not mapped here\", \"Quantitative coupling between receptor occupancy and current not fully defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified in vivo phosphorylation sites on the assembled channel, including a shared S4-S5 loop site mediating inhibition and a silent KCNQ3 tetramerization-domain site.\",\n      \"evidence\": \"Mass spectrometry of native channels with mutagenesis and electrophysiology\",\n      \"pmids\": [\"16319223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Responsible kinases not identified\", \"Physiological stimulus driving phosphorylation unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated polarized axonal/AIS targeting of M-channels and that AnkyrinG-binding motifs on both subunits are required, linking trafficking defects to BFNC mutations.\",\n      \"evidence\": \"Live surface imaging, truncation/chimera domain mapping and AnkyrinG-motif mutagenesis in neurons\",\n      \"pmids\": [\"16735477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamic trafficking route to the AIS not yet observed\", \"Distal axonal targeting determinants partially defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the A315 pore-vestibule residue as the molecular switch that keeps KCNQ3 homomers electrically silent, with A315T unlocking conduction.\",\n      \"evidence\": \"Biotinylation, TIRF imaging, mutagenesis, homology modeling and electrophysiology\",\n      \"pmids\": [\"18790849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether A315 also controls trafficking not yet tested here\", \"Structural model based on homology, not experimental structure\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established Nedd4-2 as a direct E3 ligase that ubiquitinates and downregulates KCNQ3-containing channels via its C-terminus, and SGK-1 as a counter-regulator.\",\n      \"evidence\": \"GST pulldown, Co-IP, ubiquitination assays, oocyte electrophysiology; surface biotinylation with kinase-dead mutants\",\n      \"pmids\": [\"17322297\", \"18463232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous signals controlling Nedd4-2/SGK-1 balance unclear\", \"SGK-1 evidence from single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed in native neurons that KCNQ2 and KCNQ3 contribute to medium afterhyperpolarization in a region-specific manner.\",\n      \"evidence\": \"Whole-cell patch clamp in Kcnq2- and Kcnq3-knockout mouse hippocampal neurons with pharmacology\",\n      \"pmids\": [\"19060215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of hippocalcin coupling not resolved\", \"CA1 redundancy not explained\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established A315 as an ER-retention checkpoint that enforces KCNQ2-dependent surface delivery of KCNQ3, governing subunit composition of surface M-channels.\",\n      \"evidence\": \"Subcellular fractionation, confocal imaging, mutagenesis and electrophysiology\",\n      \"pmids\": [\"20610766\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ER quality-control machinery recognizing A315 not identified\", \"Link to conductance gating function of A315 not fully integrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Directly visualized heteromer architecture as predominantly 2:2 with random subunit arrangement and variable stoichiometry, and refined pore-helix/S6 determinants of current amplitude.\",\n      \"evidence\": \"Atomic force microscopy with antibody decoration; mutagenesis, TIRF and homology modeling\",\n      \"pmids\": [\"22334706\", \"22713565\", \"22713564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of variable stoichiometry in neurons unknown\", \"Pore mechanism inferred from homology models\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined KCNQ2 as the obligatory M-channel subunit in vivo, with KCNQ3 loss producing only modest secondary effects.\",\n      \"evidence\": \"Conditional knockout mice with EEG, patch clamp, Western blot and KCNQ-activator pharmacology\",\n      \"pmids\": [\"24719109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinct contribution of KCNQ3 vs KCNQ5 to residual current not fully separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the gain-of-function disease mechanism: voltage-sensor mutation R230C stabilizes the activated state and causes constitutive opening leading to epileptic encephalopathy.\",\n      \"evidence\": \"Patch clamp, multistate structural modeling and disulfide trapping; helix C-D linker deletion with TIRF\",\n      \"pmids\": [\"25740509\", \"26692086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo seizure phenotype of R230C not modeled here\", \"Endogenous regulation of voltage-sensor stability unaddressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mechanistically separated loss- and gain-of-function disease variants, showing additive PIP2-coupling defects (V359L, D542N) versus constitutive opening from charge/size at R230.\",\n      \"evidence\": \"Patch clamp, voltage-clamp fluorometry and unnatural-amino-acid mutagenesis\",\n      \"pmids\": [\"29383681\", \"30578330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compound-heterozygous phenotype-genotype mapping limited\", \"Tissue-level consequences not assayed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided definitive human genetic proof that complete KCNQ3 loss causes severe neonatal-onset pharmacodependent epilepsy with intellectual disability.\",\n      \"evidence\": \"Exome sequencing, qRT-PCR, Western blot, immunofluorescence and patch clamp from patient material\",\n      \"pmids\": [\"31440727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single family; phenotypic spectrum of biallelic loss not broadly defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Resolved the trafficking route to the AIS, showing Kv7.3 reaches somatic/terminal membrane then diffuses bidirectionally until AnkyrinG immobilizes it, with C-terminal domains tuning efficiency.\",\n      \"evidence\": \"Live imaging, FRAP and single-molecule tracking in neurons; chimeric domain mapping\",\n      \"pmids\": [\"32903174\", \"32116557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of diffusion-to-trapping transition unclear\", \"C-terminal AIS domain hierarchy from single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded KCNQ3 physiological roles beyond cortex to hypothalamic energy homeostasis, hippocampal theta-coordinated bursting, and peripheral pain resilience, and defined SUMOylation as a regulator of assembly and PIP2 binding.\",\n      \"evidence\": \"AAV-CRISPR knockdown with patch clamp and behavior; Kcnq3-KO in vivo recording with optogenetics; iPSC sensory neurons with dynamic clamp; SENP2-deficient mice with biochemistry\",\n      \"pmids\": [\"33766732\", \"34376649\", \"34557669\", \"34509475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMOylation regulation studied in single lab\", \"D755N pain-resilience variant from single cohort\", \"Circuit basis of theta entrainment incompletely mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed greater channel compositional diversity (KCNQ2/KCNQ5 without KCNQ3) and identified subunit-selective pharmacology (triclosan activates KCNQ3 via the voltage sensor).\",\n      \"evidence\": \"Split-intein tandems with native mass spectrometry; patch clamp with mutagenesis and docking\",\n      \"pmids\": [\"35320039\", \"35459955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional weight of KCNQ2/5 channels in vivo unclear\", \"Triclosan binding site inferred from docking\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a non-canonical mechanism in which GABA directly binds and activates KCNQ3-containing channels through a W266 site with sex-specific behavioral consequences.\",\n      \"evidence\": \"W266L knock-in mouse with behavioral testing and neuronal activity measurement\",\n      \"pmids\": [\"37305551\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding affinity and structural basis not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked KCNQ3 to disease beyond excitability through transcriptional repression in pain (HDAC2/MeCP2/Sin3A) and a proliferative RAS/MAPK signaling role in thyroid cancer.\",\n      \"evidence\": \"ChIP and Co-IP with DRG electrophysiology and in vivo pain model; Co-IP/MS, ChIP-qPCR and xenograft assays\",\n      \"pmids\": [\"39192337\", \"41250218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Channel-independent vs channel-dependent contributions to cancer signaling unclear\", \"Single-lab findings\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined DNMT3a-mediated DNA methylation as an additional epigenetic route repressing kcnq2/kcnq3 in cancer pain, downstream of VEGFA-PI3K-Akt-C/EBPbeta signaling.\",\n      \"evidence\": \"In vivo bone cancer pain model, DNMT3a knockdown, ChIP, luciferase reporters and DRG electrophysiology\",\n      \"pmids\": [\"40730259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Convergence with HDAC2 repression pathway not integrated\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How channel functionality, AIS trafficking dynamics, and the regulatory PTM network (SUMOylation, ubiquitination, phosphorylation, calmodulin) are coordinated at single-molecule resolution in living neurons remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental atomic structure of KCNQ3-containing channels in the timeline\", \"Integration of PTM regulation with native trafficking not established\", \"Coupling of low-activity mutations to AIS diffusion based on preprint only\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 24, 27]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [11, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 13, 16]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [19, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 18, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 2]}\n    ],\n    \"complexes\": [\n      \"KCNQ2/KCNQ3 heterotetramer (M-channel)\",\n      \"KCNQ3/KCNQ5 heteromer\"\n    ],\n    \"partners\": [\n      \"KCNQ2\",\n      \"KCNQ5\",\n      \"KCNE2\",\n      \"NEDD4L\",\n      \"SGK1\",\n      \"AnkyrinG\",\n      \"calmodulin\",\n      \"GRB2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":9,"faith_pct":88.88888888888889}}