{"gene":"SCN11A","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1998,"finding":"NaN (Nav1.9/SCN11A) was identified as a novel voltage-gated Na+ channel alpha-subunit predicted to be tetrodotoxin-resistant, preferentially expressed in small sensory neurons of dorsal root ganglia and trigeminal ganglia; NaN mRNA levels are significantly reduced 7 days post-axotomy, consistent with reduction in TTX-R Na+ currents.","method":"cDNA cloning, sequence alignment, Northern blot/in situ hybridization, axotomy model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — original cloning and expression characterization, replicated across multiple subsequent studies","pmids":["9671787"],"is_preprint":false},{"year":2002,"finding":"Nav1.9 produces a persistent, tetrodotoxin-resistant Na+ current with wide overlap between activation and steady-state inactivation, modulating resting potential and amplifying small depolarizations in primary nociceptive neurons.","method":"Whole-cell patch-clamp electrophysiology in DRG neurons, review/synthesis of biophysical data","journal":"Trends in neurosciences","confidence":"High","confidence_rationale":"Tier 1 — biophysical characterization replicated across multiple labs","pmids":["11972962"],"is_preprint":false},{"year":2001,"finding":"Fibroblast growth factor homologous factor 1B (FHF1B) directly interacts with the C-terminal region of Nav1.9a (NaN); FHF1B binds selectively to the C-terminus of Nav1.9a but not to the C-termini of Nav1.7 or Nav1.8, identified via yeast two-hybrid screen and confirmed by in vitro binding and co-expression in mammalian cells.","method":"Yeast two-hybrid screen, in vitro pull-down, co-expression in mammalian cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — yeast two-hybrid confirmed by independent in vitro binding assay","pmids":["11376006"],"is_preprint":false},{"year":2001,"finding":"Cell adhesion molecule contactin directly binds to Nav1.9/NaN and recruits tenascin to the protein complex; contactin co-immunoprecipitates with Nav1.9 from DRG and transfected CHO cells, co-localizes along nonmyelinated C-fibers and nerve endings, and enhances surface expression of Nav1.9.","method":"Co-immunoprecipitation from DRG tissue and CHO cells, co-transfection surface expression assay, immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP from native tissue and heterologous cells, with functional surface expression consequence","pmids":["11581273"],"is_preprint":false},{"year":2004,"finding":"Nav1.9 underlies the persistent TTX-resistant current in small-diameter DRG neurons; Nav1.9 contributes to persistent thermal hypersensitivity and spontaneous pain behavior after peripheral inflammation but not to basal mechanical/thermal responsiveness or nerve injury-induced mechanical hypersensitivity.","method":"SCN11A gene knockout mice, patch-clamp electrophysiology, behavioral nociception assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined electrophysiological and behavioral phenotypes","pmids":["15964986"],"is_preprint":false},{"year":2004,"finding":"PGE2 increases Nav1.9 current approximately two-fold in DRG neurons via a G-protein-dependent mechanism involving Gi/o subunits (blocked by pertussis toxin but not cholera toxin), shifting steady-state activation hyperpolarized by 6-8 mV and availability by 12 mV.","method":"Whole-cell patch-clamp in Nav1.8-null and wild-type mouse DRG neurons, pertussis toxin and cholera toxin pharmacology","journal":"Brain research","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology with specific pharmacological dissection of G-protein subtype","pmids":["15374752"],"is_preprint":false},{"year":2003,"finding":"Nav1.9 generates a TTX-resistant persistent Na+ current selectively in myenteric sensory (IPAN) neurons of the enteric nervous system but not in interneurons or motor neurons, confirmed by RT-PCR, single-cell profiling, immunostaining, and patch-clamp.","method":"Whole-cell patch-clamp, RT-PCR, single-cell profiling, immunostaining in guinea pig and rat myenteric neurons","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in native neurons","pmids":["12684457"],"is_preprint":false},{"year":2004,"finding":"Single-channel and whole-cell recordings establish that Nav1.9 channels have long openings and high open probability; intracellular fluoride promotes entry into a preopen closed state, biasing channels towards opening and enhancing nociceptor spiking.","method":"Single-channel and whole-cell patch-clamp recordings in cultured rat DRG and myenteric neurons","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 1 — single-channel reconstitution with mechanistic gating analysis","pmids":["15121184"],"is_preprint":false},{"year":2007,"finding":"GTP (via GTPγS, a G-protein activator) upregulates the persistent TTX-resistant Na+ current and causes a negative shift in voltage threshold in small DRG neurons; this effect is absent in Nav1.9-null neurons and restored by heterologous expression of human Nav1.9, demonstrating Nav1.9 is the molecular target of G-protein pathway modulation.","method":"Nav1.9 knockout mice, intracellular GTPγS dialysis, patch-clamp, rescue by heterologous hNav1.9 expression","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1 — KO + reconstitution with human channel, definitive mechanistic assignment","pmids":["18096591"],"is_preprint":false},{"year":2008,"finding":"Nav1.9 subunits carry the TTX-resistant persistent Na+ current (NaN) in small DRG neurons; loss of Nav1.9 eliminates subthreshold regenerative depolarizations, plateau potentials, active hyperpolarizing responses, oscillatory bursting, and bistable membrane behaviors. When applied conjointly (but not individually), a soup of inflammatory mediators (bradykinin, ATP, histamine, PGE2, norepinephrine) potentiates Nav1.9 channel activity through a coincident detection mechanism.","method":"Nav1.9 gene targeting (knockout), whole-cell patch-clamp with CsCl and KCl pipette solutions, computer modeling, pharmacological application of inflammatory mediators","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 — KO + biophysical reconstitution + computational modeling, multiple orthogonal approaches","pmids":["18270172"],"is_preprint":false},{"year":2013,"finding":"G-protein activation (GTPγS) potentiates human Nav1.9 by increasing single-channel open probability and mean open time (not single-channel amplitude), causing larger peak and persistent currents; G-protein signaling also slows inactivation and causes a depolarizing shift in voltage-dependence of inactivation without changing activation voltage-dependence.","method":"Whole-cell and single-channel patch-clamp in ND7/23 cells stably expressing human Nav1.9, intracellular GTPγS","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 — single-channel mechanistic analysis with defined G-protein proxy","pmids":["23359282"],"is_preprint":false},{"year":2013,"finding":"A specific de novo gain-of-function missense mutation in SCN11A causes excessive Nav1.9 activity at resting voltages, sustained depolarization of nociceptors, impaired action potential generation, and aberrant synaptic transmission, resulting in congenital inability to experience pain in humans and recapitulated in knock-in mice.","method":"Exome sequencing, heterozygous knock-in mouse model, patch-clamp electrophysiology in DRG neurons","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — knock-in mouse + electrophysiology, multiple mutations confirmed across labs","pmids":["24036948"],"is_preprint":false},{"year":2013,"finding":"Two gain-of-function missense mutations in SCN11A (p.Arg225Cys and p.Ala808Gly) enhance Nav1.9 electrical activity and induce hyperexcitability of DRG neurons, causing autosomal-dominant familial episodic pain.","method":"Genome-wide linkage scan, exome sequencing, expression of mutant Nav1.9 in mouse DRG neurons, electrophysiology","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic mapping + functional electrophysiology in native neurons","pmids":["24207120"],"is_preprint":false},{"year":2015,"finding":"Nav1.9 acts as a subthreshold amplifier in cold-sensitive nociceptive neurons; Nav1.9 activity is upregulated in neurons responding to cooling, amplifying subthreshold depolarizations from cold transducers; Nav1.9-null mice and knockdown rats show increased cold pain thresholds, and Nav1.9 loss alleviates oxaliplatin-induced cold allodynia.","method":"Nav1.9 knockout mice, antisense knockdown rats, electrophysiology, behavioral cold pain assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — KO and knockdown with mechanistic electrophysiology and behavioral validation","pmids":["25959819"],"is_preprint":false},{"year":2015,"finding":"A gain-of-function SCN11A mutation (p.V1184A) shifts the voltage dependence of Nav1.9 channel opening to hyperpolarized potentials, reducing resting membrane potential of mouse primary sensory neurons and causing cold-resistant hyperexcitability of nociceptors, causing cold-aggravated peripheral pain in humans.","method":"Exome sequencing, patch-clamp electrophysiology in mouse DRG neurons transfected with mutant Nav1.9","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — functional electrophysiology in native neurons with defined biophysical mechanism","pmids":["26645915"],"is_preprint":false},{"year":2017,"finding":"Nav1.9 mutations associated with pain insensitivity (L1302F, L811P) cause large hyperpolarizing shifts in voltage-dependence of activation and evoke large resting membrane potential depolarizations in DRG neurons, impairing action potential generation (cellular loss of function). A U-shaped relationship between resting potential and action potential threshold explains why small depolarizations cause hyperexcitability (pain) while large depolarizations cause hypoexcitability (pain insensitivity).","method":"Patch-clamp in transfected heterologous cells and rat DRG neurons, current-clamp recordings","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis and biophysical modeling of U-shaped mechanism","pmids":["28530638"],"is_preprint":false},{"year":2016,"finding":"Stable heterologous expression of human, mouse, and rat Nav1.9 in HEK-293 cells was achieved by co-expression with β1/β2 subunits; a unique lysine residue (K799) in Domain 2 S6 of Nav1.9 influences interaction of inhibitors (tetracaine, TC-N 1752) with the pore, as shown by K799N mutation.","method":"Stable HEK-293 cell expression, patch-clamp, site-directed mutagenesis (K799N), pharmacological profiling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with functional pharmacological readout in reconstituted system","pmids":["27556810"],"is_preprint":false},{"year":2015,"finding":"Poor heterologous expression of Nav1.9 is caused by its C-terminal structure; a chimera of Nav1.9 with the C-terminus of Nav1.4 enables functional expression in HEK 293T cells and Xenopus oocytes. The slow open-state inactivation of Nav1.9 is mediated by the IFM inactivation motif in the DIII-DIV linker, and mutation S360Y renders Nav1.9 sensitive to tetrodotoxin and saxitoxin.","method":"Chimeric channel construction, patch-clamp, two-electrode voltage-clamp in Xenopus oocytes, mutagenesis (S360Y)","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with chimeras and mutagenesis identifying structural determinants","pmids":["25916202"],"is_preprint":false},{"year":2019,"finding":"Abnormal activation of Nav1.9 channels by nitric oxide (NO) causes triptan-induced medication overuse headache (MOH); deletion of Scn11a abrogates NO-mediated symptoms; Nav1.9 activation triggers CGRP secretion causing artery dilatation and mast cell degranulation, which in turn potentiates Nav1.9 in meningeal nociceptors. PKA is downregulated in trigeminal neurons from MOH mice, relieving inhibitory action on NO-Nav1.9 coupling.","method":"Scn11a knockout mice, electrophysiology in dural afferent neurons, signaling network analysis, behavioral assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple mechanistic readouts (electrophysiology, CGRP release, mast cell biology, signaling pathway)","pmids":["31534133"],"is_preprint":false},{"year":2018,"finding":"Nav1.9 is expressed in a subset of nonmyelinated, nonpeptidergic small-diameter DRG neurons; pruritogens alter action potential parameters and Nav channel gating in wild-type but not Nav1.9-null DRG neurons; Nav1.9-null mice show reduced acute scratching to pruritogens while Nav1.9 gain-of-function mice (L799P) display increased spontaneous scratching, establishing Nav1.9 as a contributor to itch signaling.","method":"Fluorescent-tagged Nav1.9 knock-in mouse, Nav1.9 knockout and Nav1.9-L799P knock-in mice, patch-clamp, behavioral pruritogen assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple mouse models with electrophysiology and behavior","pmids":["30395542"],"is_preprint":false},{"year":2011,"finding":"Nav1.9 contributes to heat and mechanical pain hypersensitivity in subacute (carrageenan) and chronic (CFA monoarthritis) inflammatory pain models; Nav1.9 immunoreactivity increases in ipsilateral DRGs 24 hours after carrageenan, correlating with increased axonal transport, without change in current density at the soma.","method":"Nav1.9-null mice, antisense knockdown rats, behavioral tests (von Frey, dynamic weight bearing, Hargreaves), immunohistochemistry, patch-clamp","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — KO and knockdown with multiple behavioral and cellular phenotypes","pmids":["21857998"],"is_preprint":false},{"year":2019,"finding":"A novel Nav1.9 gain-of-function mutation (N816K) increases current density, hyperpolarizes voltage-dependence of activation by 10 mV, enlarges window current, depolarizes resting membrane potential of small DRG neurons by 7 mV, and renders DRG neurons hyperexcitable in a child with episodic pain.","method":"Voltage-clamp and current-clamp in transfected rat DRG neurons, Sanger sequencing","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — functional electrophysiology in native neurons, single lab","pmids":["31551682"],"is_preprint":false},{"year":2017,"finding":"Nav1.9-null C-fibers show elevated electrical threshold (by 55%), reduced prevalence of mechano-heat sensitive C-fibers, elevated heat thresholds, lower activity-induced slowing of conduction velocity on noxious heat, and reduced heat-induced CGRP release from skin, demonstrating Nav1.9 contributes to acute thermal and mechanical nociception by increasing excitability and amplifying receptor potentials.","method":"Single-fiber electrophysiology from isolated skin, compound action potential recordings, CGRP release assay, Hargreaves test, Nav1.9 knockout mice","journal":"Pain","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in KO model with defined mechanistic readouts","pmids":["27780178"],"is_preprint":false},{"year":2013,"finding":"Amitriptyline inhibits Nav1.9 currents in a concentration-dependent and state-selective manner (IC50 ~15 µM in TG neurons), shifting steady-state inactivation hyperpolarized without affecting activation, and without use-dependent block.","method":"Whole-cell patch-clamp in acutely isolated rat trigeminal ganglion neurons","journal":"Molecular pain","confidence":"Medium","confidence_rationale":"Tier 2 — clean pharmacological characterization in native neurons, single lab","pmids":["24228717"],"is_preprint":false},{"year":2019,"finding":"Protein kinase C-α (PKCα) upregulates Nav1.9 expression in nociceptive DRG neurons in a CFA-induced arthritis pain model; PKC activator (PMA) increases Nav1.9 expression in cultured DRG neurons and in vivo, while PKC inhibitor (GF-109203X) decreases Nav1.9 expression and attenuates hyperalgesia.","method":"In vitro and in vivo PKC modulator treatment, qPCR, Western blot, immunofluorescence, behavioral tests","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacological modulation with expression readouts, single lab","pmids":["31385361"],"is_preprint":false}],"current_model":"Nav1.9 (SCN11A) is a tetrodotoxin-resistant, voltage-gated sodium channel preferentially expressed in nociceptive DRG and trigeminal ganglion neurons that generates a persistent, low-threshold Na+ current with overlapping activation and inactivation; it sets resting membrane potential and amplifies subthreshold depolarizations; its activity is potentiated by Gi/o-coupled G-protein signaling (including by inflammatory mediators acting coincidentally) through increased single-channel open probability and mean open time; contactin targets it to the neuronal surface while FHF1B binds its C-terminus; gain-of-function mutations cause pain disorders ranging from familial episodic pain to pain insensitivity (via excessive depolarization-induced inactivation of nociceptors), and the channel also contributes to itch, cold pain, and medication-overuse headache via NO-mediated activation."},"narrative":{"teleology":[{"year":1998,"claim":"The identification of Nav1.9 as a distinct TTX-resistant sodium channel subunit preferentially expressed in small sensory neurons established SCN11A as a nociceptor-specific ion channel gene, opening the question of what current it carries and what pain modalities it serves.","evidence":"cDNA cloning, sequence alignment, Northern blot, in situ hybridization, and axotomy model in rat DRG","pmids":["9671787"],"confidence":"High","gaps":["No functional current had yet been recorded from cloned Nav1.9","Heterologous expression system not yet established"]},{"year":2002,"claim":"Biophysical characterization revealed that Nav1.9 carries a persistent TTX-resistant current with uniquely broad overlap between activation and inactivation, establishing its role as a subthreshold amplifier that modulates resting membrane potential rather than driving fast action potentials.","evidence":"Whole-cell patch-clamp electrophysiology in native DRG neurons, synthesis of biophysical data across labs","pmids":["11972962","15121184"],"confidence":"High","gaps":["Contribution to specific pain modalities in vivo not yet demonstrated","Molecular basis of the unusually slow inactivation unknown"]},{"year":2001,"claim":"Discovery that contactin promotes Nav1.9 surface expression and that FHF1B selectively binds the Nav1.9 C-terminus identified the first protein partners governing channel trafficking and potentially gating.","evidence":"Co-immunoprecipitation from DRG tissue and heterologous cells, yeast two-hybrid screen with in vitro pull-down confirmation","pmids":["11581273","11376006"],"confidence":"High","gaps":["Functional consequence of FHF1B binding on channel gating not determined","Whether contactin loss phenocopies Nav1.9 loss in vivo was untested"]},{"year":2004,"claim":"Knockout of SCN11A proved Nav1.9 is required for inflammatory thermal hypersensitivity and spontaneous pain but dispensable for basal nociception and nerve injury pain, delineating its selective role in inflammatory sensitization.","evidence":"SCN11A-null mice, patch-clamp, and behavioral nociception assays (carrageenan, formalin models)","pmids":["15964986"],"confidence":"High","gaps":["Role in chronic arthritis and cold pain not yet tested","Mechanism by which inflammation selectively engages Nav1.9 unclear"]},{"year":2004,"claim":"PGE2 was shown to upregulate Nav1.9 current via Gi/o-coupled G-proteins, and multiple inflammatory mediators were later found to potentiate Nav1.9 only when applied coincidentally, establishing Nav1.9 as a coincidence detector for inflammatory signals.","evidence":"Patch-clamp in Nav1.8-null DRG neurons with pertussis/cholera toxin pharmacology; KO neurons with inflammatory mediator cocktail and GTPγS dialysis","pmids":["15374752","18270172","18096591"],"confidence":"High","gaps":["Identity of the specific Gi/o subunit(s) and downstream effectors coupling to the channel unknown","Whether coincidence detection operates in vivo during inflammation not shown"]},{"year":2013,"claim":"Single-channel analysis of G-protein–potentiated human Nav1.9 revealed the mechanism is an increase in open probability and mean open time without altered unitary conductance, providing a biophysical explanation for inflammatory sensitization.","evidence":"Single-channel and whole-cell patch-clamp in ND7/23 cells stably expressing human Nav1.9 with intracellular GTPγS","pmids":["23359282"],"confidence":"High","gaps":["Whether G-protein acts directly on the channel or via an intermediary not resolved","Structural basis for G-protein modulation unknown"]},{"year":2013,"claim":"Human genetic discoveries linked SCN11A gain-of-function mutations both to familial episodic pain and, paradoxically, to congenital pain insensitivity, posing the question of how activating mutations can produce opposite phenotypes.","evidence":"Exome sequencing, genome-wide linkage, electrophysiology of mutant channels in DRG neurons, knock-in mouse model","pmids":["24036948","24207120"],"confidence":"High","gaps":["Mechanistic explanation for the divergent phenotypes not yet provided","Incomplete genotype–phenotype correlations across mutations"]},{"year":2015,"claim":"Chimeric channel engineering showed the C-terminus limits heterologous expression and identified the IFM motif in the DIII–DIV linker as mediating slow open-state inactivation, while the S360Y mutation restored TTX sensitivity, resolving long-standing technical barriers and structural determinants of Nav1.9 gating.","evidence":"Nav1.9/Nav1.4 chimeras expressed in HEK 293T cells and Xenopus oocytes, patch-clamp, mutagenesis","pmids":["25916202"],"confidence":"High","gaps":["No full-length Nav1.9 cryo-EM or crystal structure available","Structural basis for TTX resistance beyond S360 not fully mapped"]},{"year":2015,"claim":"Nav1.9 was established as a subthreshold amplifier in cold-sensitive nociceptors, with Nav1.9-null mice showing elevated cold pain thresholds and protection from oxaliplatin-induced cold allodynia, extending its role beyond inflammatory heat pain.","evidence":"Nav1.9 knockout mice, antisense knockdown rats, electrophysiology, behavioral cold pain assays","pmids":["25959819","26645915"],"confidence":"High","gaps":["Molecular mechanism linking cold transducers to Nav1.9 activation not identified","Relative contribution of Nav1.9 versus other Nav channels to cold allodynia not quantified"]},{"year":2017,"claim":"The paradox of gain-of-function mutations causing either pain or pain insensitivity was resolved by demonstrating a U-shaped relationship between resting potential depolarization and AP threshold: moderate Nav1.9 gain-of-function depolarizes neurons into hyperexcitability while extreme gain-of-function causes depolarization block.","evidence":"Patch-clamp in transfected heterologous cells and rat DRG neurons comparing pain-causing versus pain-insensitivity mutations","pmids":["28530638"],"confidence":"High","gaps":["Quantitative thresholds defining the transition from hyperexcitability to block not established for all mutations","Whether compensatory mechanisms modulate the phenotype in vivo unknown"]},{"year":2018,"claim":"Nav1.9 was shown to contribute to itch signaling, with pruritogens modulating Nav1.9-dependent gating in DRG neurons and Nav1.9 gain-of-function mice exhibiting spontaneous scratching, expanding the channel's role beyond pain.","evidence":"Nav1.9-null, Nav1.9 gain-of-function (L799P), and fluorescent Nav1.9 knock-in mice with patch-clamp and behavioral pruritogen assays","pmids":["30395542"],"confidence":"High","gaps":["Pruritogen receptor–Nav1.9 signaling pathway not delineated","Relative contribution to chronic itch conditions untested"]},{"year":2019,"claim":"Nav1.9 was identified as the effector channel mediating NO-dependent triptan-induced medication overuse headache, linking its activation to CGRP release from meningeal nociceptors and mast cell degranulation in a feed-forward loop.","evidence":"SCN11A-null mice, electrophysiology in dural afferent neurons, CGRP release and mast cell assays, behavioral MOH model","pmids":["31534133"],"confidence":"High","gaps":["Direct binding site or mechanism of NO-mediated Nav1.9 activation not identified","Translational relevance to human MOH not clinically validated"]},{"year":null,"claim":"Key unresolved questions include the structural basis for G-protein modulation and NO activation of Nav1.9, the identity of the specific Gβγ or Gα subunit that directly acts on the channel, and whether Nav1.9-selective pharmacology can be achieved for therapeutic targeting of pain and itch.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of Nav1.9 available","No Nav1.9-selective small-molecule inhibitor reported","Direct G-protein binding site on the channel not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,4,7,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,16]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,6,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,8,10,18]}],"complexes":[],"partners":["CNTN1","FHF1B","SCN1B","SCN2B","TNC"],"other_free_text":[]},"mechanistic_narrative":"SCN11A encodes Nav1.9, a tetrodotoxin-resistant voltage-gated sodium channel preferentially expressed in small-diameter nociceptive neurons of dorsal root ganglia, trigeminal ganglia, and the enteric nervous system, where it generates a persistent, low-threshold sodium current that sets resting membrane potential and amplifies subthreshold depolarizations to control nociceptor excitability [PMID:9671787, PMID:11972962, PMID:12684457]. Nav1.9 activity is potentiated by Gi/o-coupled G-protein signaling—triggered by inflammatory mediators such as PGE2 and by coincident application of multiple mediators—through increases in single-channel open probability and mean open time rather than unitary conductance [PMID:15374752, PMID:23359282, PMID:18270172]. The channel is targeted to the neuronal surface by the cell adhesion molecule contactin and its C-terminus binds FHF1B, while its slow open-state inactivation depends on the conserved IFM motif in the DIII–DIV linker [PMID:11581273, PMID:11376006, PMID:25916202]. Gain-of-function SCN11A mutations cause a spectrum of heritable pain disorders—from familial episodic pain to congenital insensitivity to pain—explained by a U-shaped relationship between resting potential depolarization and action potential generation, whereby moderate depolarization produces hyperexcitability (pain) and excessive depolarization causes depolarization block (pain insensitivity) [PMID:24207120, PMID:24036948, PMID:28530638]."},"prefetch_data":{"uniprot":{"accession":"Q9UI33","full_name":"Sodium channel protein type 11 subunit alpha","aliases":["Peripheral nerve sodium channel 5","PN5","Sensory neuron sodium channel 2","Sodium channel protein type XI subunit alpha","Voltage-gated sodium channel subunit alpha Nav1.9","hNaN"],"length_aa":1791,"mass_kda":204.9,"function":"Sodium channel mediating the voltage-dependent sodium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a sodium-selective channel through which sodium ions may pass in accordance with their electrochemical gradient (PubMed:10580103, PubMed:12384689, PubMed:24036948, PubMed:24776970, PubMed:25791876, PubMed:26645915). Involved in membrane depolarization during action potential in nociceptors which function as key relay stations for the electrical transmission of pain signals from the periphery to the central nervous system (PubMed:24036948, PubMed:24776970, PubMed:25791876, PubMed:26645915). 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NaN mRNA levels are significantly reduced 7 days post-axotomy, consistent with reduction in TTX-R Na+ currents.\",\n      \"method\": \"cDNA cloning, sequence alignment, Northern blot/in situ hybridization, axotomy model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original cloning and expression characterization, replicated across multiple subsequent studies\",\n      \"pmids\": [\"9671787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Nav1.9 produces a persistent, tetrodotoxin-resistant Na+ current with wide overlap between activation and steady-state inactivation, modulating resting potential and amplifying small depolarizations in primary nociceptive neurons.\",\n      \"method\": \"Whole-cell patch-clamp electrophysiology in DRG neurons, review/synthesis of biophysical data\",\n      \"journal\": \"Trends in neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biophysical characterization replicated across multiple labs\",\n      \"pmids\": [\"11972962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fibroblast growth factor homologous factor 1B (FHF1B) directly interacts with the C-terminal region of Nav1.9a (NaN); FHF1B binds selectively to the C-terminus of Nav1.9a but not to the C-termini of Nav1.7 or Nav1.8, identified via yeast two-hybrid screen and confirmed by in vitro binding and co-expression in mammalian cells.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro pull-down, co-expression in mammalian cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — yeast two-hybrid confirmed by independent in vitro binding assay\",\n      \"pmids\": [\"11376006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Cell adhesion molecule contactin directly binds to Nav1.9/NaN and recruits tenascin to the protein complex; contactin co-immunoprecipitates with Nav1.9 from DRG and transfected CHO cells, co-localizes along nonmyelinated C-fibers and nerve endings, and enhances surface expression of Nav1.9.\",\n      \"method\": \"Co-immunoprecipitation from DRG tissue and CHO cells, co-transfection surface expression assay, immunohistochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP from native tissue and heterologous cells, with functional surface expression consequence\",\n      \"pmids\": [\"11581273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Nav1.9 underlies the persistent TTX-resistant current in small-diameter DRG neurons; Nav1.9 contributes to persistent thermal hypersensitivity and spontaneous pain behavior after peripheral inflammation but not to basal mechanical/thermal responsiveness or nerve injury-induced mechanical hypersensitivity.\",\n      \"method\": \"SCN11A gene knockout mice, patch-clamp electrophysiology, behavioral nociception assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined electrophysiological and behavioral phenotypes\",\n      \"pmids\": [\"15964986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PGE2 increases Nav1.9 current approximately two-fold in DRG neurons via a G-protein-dependent mechanism involving Gi/o subunits (blocked by pertussis toxin but not cholera toxin), shifting steady-state activation hyperpolarized by 6-8 mV and availability by 12 mV.\",\n      \"method\": \"Whole-cell patch-clamp in Nav1.8-null and wild-type mouse DRG neurons, pertussis toxin and cholera toxin pharmacology\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology with specific pharmacological dissection of G-protein subtype\",\n      \"pmids\": [\"15374752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nav1.9 generates a TTX-resistant persistent Na+ current selectively in myenteric sensory (IPAN) neurons of the enteric nervous system but not in interneurons or motor neurons, confirmed by RT-PCR, single-cell profiling, immunostaining, and patch-clamp.\",\n      \"method\": \"Whole-cell patch-clamp, RT-PCR, single-cell profiling, immunostaining in guinea pig and rat myenteric neurons\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in native neurons\",\n      \"pmids\": [\"12684457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Single-channel and whole-cell recordings establish that Nav1.9 channels have long openings and high open probability; intracellular fluoride promotes entry into a preopen closed state, biasing channels towards opening and enhancing nociceptor spiking.\",\n      \"method\": \"Single-channel and whole-cell patch-clamp recordings in cultured rat DRG and myenteric neurons\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-channel reconstitution with mechanistic gating analysis\",\n      \"pmids\": [\"15121184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GTP (via GTPγS, a G-protein activator) upregulates the persistent TTX-resistant Na+ current and causes a negative shift in voltage threshold in small DRG neurons; this effect is absent in Nav1.9-null neurons and restored by heterologous expression of human Nav1.9, demonstrating Nav1.9 is the molecular target of G-protein pathway modulation.\",\n      \"method\": \"Nav1.9 knockout mice, intracellular GTPγS dialysis, patch-clamp, rescue by heterologous hNav1.9 expression\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — KO + reconstitution with human channel, definitive mechanistic assignment\",\n      \"pmids\": [\"18096591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nav1.9 subunits carry the TTX-resistant persistent Na+ current (NaN) in small DRG neurons; loss of Nav1.9 eliminates subthreshold regenerative depolarizations, plateau potentials, active hyperpolarizing responses, oscillatory bursting, and bistable membrane behaviors. When applied conjointly (but not individually), a soup of inflammatory mediators (bradykinin, ATP, histamine, PGE2, norepinephrine) potentiates Nav1.9 channel activity through a coincident detection mechanism.\",\n      \"method\": \"Nav1.9 gene targeting (knockout), whole-cell patch-clamp with CsCl and KCl pipette solutions, computer modeling, pharmacological application of inflammatory mediators\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — KO + biophysical reconstitution + computational modeling, multiple orthogonal approaches\",\n      \"pmids\": [\"18270172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"G-protein activation (GTPγS) potentiates human Nav1.9 by increasing single-channel open probability and mean open time (not single-channel amplitude), causing larger peak and persistent currents; G-protein signaling also slows inactivation and causes a depolarizing shift in voltage-dependence of inactivation without changing activation voltage-dependence.\",\n      \"method\": \"Whole-cell and single-channel patch-clamp in ND7/23 cells stably expressing human Nav1.9, intracellular GTPγS\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-channel mechanistic analysis with defined G-protein proxy\",\n      \"pmids\": [\"23359282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A specific de novo gain-of-function missense mutation in SCN11A causes excessive Nav1.9 activity at resting voltages, sustained depolarization of nociceptors, impaired action potential generation, and aberrant synaptic transmission, resulting in congenital inability to experience pain in humans and recapitulated in knock-in mice.\",\n      \"method\": \"Exome sequencing, heterozygous knock-in mouse model, patch-clamp electrophysiology in DRG neurons\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — knock-in mouse + electrophysiology, multiple mutations confirmed across labs\",\n      \"pmids\": [\"24036948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Two gain-of-function missense mutations in SCN11A (p.Arg225Cys and p.Ala808Gly) enhance Nav1.9 electrical activity and induce hyperexcitability of DRG neurons, causing autosomal-dominant familial episodic pain.\",\n      \"method\": \"Genome-wide linkage scan, exome sequencing, expression of mutant Nav1.9 in mouse DRG neurons, electrophysiology\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mapping + functional electrophysiology in native neurons\",\n      \"pmids\": [\"24207120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nav1.9 acts as a subthreshold amplifier in cold-sensitive nociceptive neurons; Nav1.9 activity is upregulated in neurons responding to cooling, amplifying subthreshold depolarizations from cold transducers; Nav1.9-null mice and knockdown rats show increased cold pain thresholds, and Nav1.9 loss alleviates oxaliplatin-induced cold allodynia.\",\n      \"method\": \"Nav1.9 knockout mice, antisense knockdown rats, electrophysiology, behavioral cold pain assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO and knockdown with mechanistic electrophysiology and behavioral validation\",\n      \"pmids\": [\"25959819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A gain-of-function SCN11A mutation (p.V1184A) shifts the voltage dependence of Nav1.9 channel opening to hyperpolarized potentials, reducing resting membrane potential of mouse primary sensory neurons and causing cold-resistant hyperexcitability of nociceptors, causing cold-aggravated peripheral pain in humans.\",\n      \"method\": \"Exome sequencing, patch-clamp electrophysiology in mouse DRG neurons transfected with mutant Nav1.9\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional electrophysiology in native neurons with defined biophysical mechanism\",\n      \"pmids\": [\"26645915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nav1.9 mutations associated with pain insensitivity (L1302F, L811P) cause large hyperpolarizing shifts in voltage-dependence of activation and evoke large resting membrane potential depolarizations in DRG neurons, impairing action potential generation (cellular loss of function). A U-shaped relationship between resting potential and action potential threshold explains why small depolarizations cause hyperexcitability (pain) while large depolarizations cause hypoexcitability (pain insensitivity).\",\n      \"method\": \"Patch-clamp in transfected heterologous cells and rat DRG neurons, current-clamp recordings\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis and biophysical modeling of U-shaped mechanism\",\n      \"pmids\": [\"28530638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Stable heterologous expression of human, mouse, and rat Nav1.9 in HEK-293 cells was achieved by co-expression with β1/β2 subunits; a unique lysine residue (K799) in Domain 2 S6 of Nav1.9 influences interaction of inhibitors (tetracaine, TC-N 1752) with the pore, as shown by K799N mutation.\",\n      \"method\": \"Stable HEK-293 cell expression, patch-clamp, site-directed mutagenesis (K799N), pharmacological profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional pharmacological readout in reconstituted system\",\n      \"pmids\": [\"27556810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Poor heterologous expression of Nav1.9 is caused by its C-terminal structure; a chimera of Nav1.9 with the C-terminus of Nav1.4 enables functional expression in HEK 293T cells and Xenopus oocytes. The slow open-state inactivation of Nav1.9 is mediated by the IFM inactivation motif in the DIII-DIV linker, and mutation S360Y renders Nav1.9 sensitive to tetrodotoxin and saxitoxin.\",\n      \"method\": \"Chimeric channel construction, patch-clamp, two-electrode voltage-clamp in Xenopus oocytes, mutagenesis (S360Y)\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with chimeras and mutagenesis identifying structural determinants\",\n      \"pmids\": [\"25916202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Abnormal activation of Nav1.9 channels by nitric oxide (NO) causes triptan-induced medication overuse headache (MOH); deletion of Scn11a abrogates NO-mediated symptoms; Nav1.9 activation triggers CGRP secretion causing artery dilatation and mast cell degranulation, which in turn potentiates Nav1.9 in meningeal nociceptors. PKA is downregulated in trigeminal neurons from MOH mice, relieving inhibitory action on NO-Nav1.9 coupling.\",\n      \"method\": \"Scn11a knockout mice, electrophysiology in dural afferent neurons, signaling network analysis, behavioral assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple mechanistic readouts (electrophysiology, CGRP release, mast cell biology, signaling pathway)\",\n      \"pmids\": [\"31534133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nav1.9 is expressed in a subset of nonmyelinated, nonpeptidergic small-diameter DRG neurons; pruritogens alter action potential parameters and Nav channel gating in wild-type but not Nav1.9-null DRG neurons; Nav1.9-null mice show reduced acute scratching to pruritogens while Nav1.9 gain-of-function mice (L799P) display increased spontaneous scratching, establishing Nav1.9 as a contributor to itch signaling.\",\n      \"method\": \"Fluorescent-tagged Nav1.9 knock-in mouse, Nav1.9 knockout and Nav1.9-L799P knock-in mice, patch-clamp, behavioral pruritogen assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mouse models with electrophysiology and behavior\",\n      \"pmids\": [\"30395542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nav1.9 contributes to heat and mechanical pain hypersensitivity in subacute (carrageenan) and chronic (CFA monoarthritis) inflammatory pain models; Nav1.9 immunoreactivity increases in ipsilateral DRGs 24 hours after carrageenan, correlating with increased axonal transport, without change in current density at the soma.\",\n      \"method\": \"Nav1.9-null mice, antisense knockdown rats, behavioral tests (von Frey, dynamic weight bearing, Hargreaves), immunohistochemistry, patch-clamp\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO and knockdown with multiple behavioral and cellular phenotypes\",\n      \"pmids\": [\"21857998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A novel Nav1.9 gain-of-function mutation (N816K) increases current density, hyperpolarizes voltage-dependence of activation by 10 mV, enlarges window current, depolarizes resting membrane potential of small DRG neurons by 7 mV, and renders DRG neurons hyperexcitable in a child with episodic pain.\",\n      \"method\": \"Voltage-clamp and current-clamp in transfected rat DRG neurons, Sanger sequencing\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional electrophysiology in native neurons, single lab\",\n      \"pmids\": [\"31551682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nav1.9-null C-fibers show elevated electrical threshold (by 55%), reduced prevalence of mechano-heat sensitive C-fibers, elevated heat thresholds, lower activity-induced slowing of conduction velocity on noxious heat, and reduced heat-induced CGRP release from skin, demonstrating Nav1.9 contributes to acute thermal and mechanical nociception by increasing excitability and amplifying receptor potentials.\",\n      \"method\": \"Single-fiber electrophysiology from isolated skin, compound action potential recordings, CGRP release assay, Hargreaves test, Nav1.9 knockout mice\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in KO model with defined mechanistic readouts\",\n      \"pmids\": [\"27780178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Amitriptyline inhibits Nav1.9 currents in a concentration-dependent and state-selective manner (IC50 ~15 µM in TG neurons), shifting steady-state inactivation hyperpolarized without affecting activation, and without use-dependent block.\",\n      \"method\": \"Whole-cell patch-clamp in acutely isolated rat trigeminal ganglion neurons\",\n      \"journal\": \"Molecular pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean pharmacological characterization in native neurons, single lab\",\n      \"pmids\": [\"24228717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Protein kinase C-α (PKCα) upregulates Nav1.9 expression in nociceptive DRG neurons in a CFA-induced arthritis pain model; PKC activator (PMA) increases Nav1.9 expression in cultured DRG neurons and in vivo, while PKC inhibitor (GF-109203X) decreases Nav1.9 expression and attenuates hyperalgesia.\",\n      \"method\": \"In vitro and in vivo PKC modulator treatment, qPCR, Western blot, immunofluorescence, behavioral tests\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological modulation with expression readouts, single lab\",\n      \"pmids\": [\"31385361\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Nav1.9 (SCN11A) is a tetrodotoxin-resistant, voltage-gated sodium channel preferentially expressed in nociceptive DRG and trigeminal ganglion neurons that generates a persistent, low-threshold Na+ current with overlapping activation and inactivation; it sets resting membrane potential and amplifies subthreshold depolarizations; its activity is potentiated by Gi/o-coupled G-protein signaling (including by inflammatory mediators acting coincidentally) through increased single-channel open probability and mean open time; contactin targets it to the neuronal surface while FHF1B binds its C-terminus; gain-of-function mutations cause pain disorders ranging from familial episodic pain to pain insensitivity (via excessive depolarization-induced inactivation of nociceptors), and the channel also contributes to itch, cold pain, and medication-overuse headache via NO-mediated activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SCN11A encodes Nav1.9, a tetrodotoxin-resistant voltage-gated sodium channel preferentially expressed in small-diameter nociceptive neurons of dorsal root ganglia, trigeminal ganglia, and the enteric nervous system, where it generates a persistent, low-threshold sodium current that sets resting membrane potential and amplifies subthreshold depolarizations to control nociceptor excitability [PMID:9671787, PMID:11972962, PMID:12684457]. Nav1.9 activity is potentiated by Gi/o-coupled G-protein signaling—triggered by inflammatory mediators such as PGE2 and by coincident application of multiple mediators—through increases in single-channel open probability and mean open time rather than unitary conductance [PMID:15374752, PMID:23359282, PMID:18270172]. The channel is targeted to the neuronal surface by the cell adhesion molecule contactin and its C-terminus binds FHF1B, while its slow open-state inactivation depends on the conserved IFM motif in the DIII–DIV linker [PMID:11581273, PMID:11376006, PMID:25916202]. Gain-of-function SCN11A mutations cause a spectrum of heritable pain disorders—from familial episodic pain to congenital insensitivity to pain—explained by a U-shaped relationship between resting potential depolarization and action potential generation, whereby moderate depolarization produces hyperexcitability (pain) and excessive depolarization causes depolarization block (pain insensitivity) [PMID:24207120, PMID:24036948, PMID:28530638].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"The identification of Nav1.9 as a distinct TTX-resistant sodium channel subunit preferentially expressed in small sensory neurons established SCN11A as a nociceptor-specific ion channel gene, opening the question of what current it carries and what pain modalities it serves.\",\n      \"evidence\": \"cDNA cloning, sequence alignment, Northern blot, in situ hybridization, and axotomy model in rat DRG\",\n      \"pmids\": [\"9671787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional current had yet been recorded from cloned Nav1.9\", \"Heterologous expression system not yet established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Biophysical characterization revealed that Nav1.9 carries a persistent TTX-resistant current with uniquely broad overlap between activation and inactivation, establishing its role as a subthreshold amplifier that modulates resting membrane potential rather than driving fast action potentials.\",\n      \"evidence\": \"Whole-cell patch-clamp electrophysiology in native DRG neurons, synthesis of biophysical data across labs\",\n      \"pmids\": [\"11972962\", \"15121184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution to specific pain modalities in vivo not yet demonstrated\", \"Molecular basis of the unusually slow inactivation unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery that contactin promotes Nav1.9 surface expression and that FHF1B selectively binds the Nav1.9 C-terminus identified the first protein partners governing channel trafficking and potentially gating.\",\n      \"evidence\": \"Co-immunoprecipitation from DRG tissue and heterologous cells, yeast two-hybrid screen with in vitro pull-down confirmation\",\n      \"pmids\": [\"11581273\", \"11376006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of FHF1B binding on channel gating not determined\", \"Whether contactin loss phenocopies Nav1.9 loss in vivo was untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Knockout of SCN11A proved Nav1.9 is required for inflammatory thermal hypersensitivity and spontaneous pain but dispensable for basal nociception and nerve injury pain, delineating its selective role in inflammatory sensitization.\",\n      \"evidence\": \"SCN11A-null mice, patch-clamp, and behavioral nociception assays (carrageenan, formalin models)\",\n      \"pmids\": [\"15964986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role in chronic arthritis and cold pain not yet tested\", \"Mechanism by which inflammation selectively engages Nav1.9 unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"PGE2 was shown to upregulate Nav1.9 current via Gi/o-coupled G-proteins, and multiple inflammatory mediators were later found to potentiate Nav1.9 only when applied coincidentally, establishing Nav1.9 as a coincidence detector for inflammatory signals.\",\n      \"evidence\": \"Patch-clamp in Nav1.8-null DRG neurons with pertussis/cholera toxin pharmacology; KO neurons with inflammatory mediator cocktail and GTPγS dialysis\",\n      \"pmids\": [\"15374752\", \"18270172\", \"18096591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the specific Gi/o subunit(s) and downstream effectors coupling to the channel unknown\", \"Whether coincidence detection operates in vivo during inflammation not shown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Single-channel analysis of G-protein–potentiated human Nav1.9 revealed the mechanism is an increase in open probability and mean open time without altered unitary conductance, providing a biophysical explanation for inflammatory sensitization.\",\n      \"evidence\": \"Single-channel and whole-cell patch-clamp in ND7/23 cells stably expressing human Nav1.9 with intracellular GTPγS\",\n      \"pmids\": [\"23359282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether G-protein acts directly on the channel or via an intermediary not resolved\", \"Structural basis for G-protein modulation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Human genetic discoveries linked SCN11A gain-of-function mutations both to familial episodic pain and, paradoxically, to congenital pain insensitivity, posing the question of how activating mutations can produce opposite phenotypes.\",\n      \"evidence\": \"Exome sequencing, genome-wide linkage, electrophysiology of mutant channels in DRG neurons, knock-in mouse model\",\n      \"pmids\": [\"24036948\", \"24207120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic explanation for the divergent phenotypes not yet provided\", \"Incomplete genotype–phenotype correlations across mutations\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Chimeric channel engineering showed the C-terminus limits heterologous expression and identified the IFM motif in the DIII–DIV linker as mediating slow open-state inactivation, while the S360Y mutation restored TTX sensitivity, resolving long-standing technical barriers and structural determinants of Nav1.9 gating.\",\n      \"evidence\": \"Nav1.9/Nav1.4 chimeras expressed in HEK 293T cells and Xenopus oocytes, patch-clamp, mutagenesis\",\n      \"pmids\": [\"25916202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length Nav1.9 cryo-EM or crystal structure available\", \"Structural basis for TTX resistance beyond S360 not fully mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Nav1.9 was established as a subthreshold amplifier in cold-sensitive nociceptors, with Nav1.9-null mice showing elevated cold pain thresholds and protection from oxaliplatin-induced cold allodynia, extending its role beyond inflammatory heat pain.\",\n      \"evidence\": \"Nav1.9 knockout mice, antisense knockdown rats, electrophysiology, behavioral cold pain assays\",\n      \"pmids\": [\"25959819\", \"26645915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking cold transducers to Nav1.9 activation not identified\", \"Relative contribution of Nav1.9 versus other Nav channels to cold allodynia not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The paradox of gain-of-function mutations causing either pain or pain insensitivity was resolved by demonstrating a U-shaped relationship between resting potential depolarization and AP threshold: moderate Nav1.9 gain-of-function depolarizes neurons into hyperexcitability while extreme gain-of-function causes depolarization block.\",\n      \"evidence\": \"Patch-clamp in transfected heterologous cells and rat DRG neurons comparing pain-causing versus pain-insensitivity mutations\",\n      \"pmids\": [\"28530638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative thresholds defining the transition from hyperexcitability to block not established for all mutations\", \"Whether compensatory mechanisms modulate the phenotype in vivo unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Nav1.9 was shown to contribute to itch signaling, with pruritogens modulating Nav1.9-dependent gating in DRG neurons and Nav1.9 gain-of-function mice exhibiting spontaneous scratching, expanding the channel's role beyond pain.\",\n      \"evidence\": \"Nav1.9-null, Nav1.9 gain-of-function (L799P), and fluorescent Nav1.9 knock-in mice with patch-clamp and behavioral pruritogen assays\",\n      \"pmids\": [\"30395542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pruritogen receptor–Nav1.9 signaling pathway not delineated\", \"Relative contribution to chronic itch conditions untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Nav1.9 was identified as the effector channel mediating NO-dependent triptan-induced medication overuse headache, linking its activation to CGRP release from meningeal nociceptors and mast cell degranulation in a feed-forward loop.\",\n      \"evidence\": \"SCN11A-null mice, electrophysiology in dural afferent neurons, CGRP release and mast cell assays, behavioral MOH model\",\n      \"pmids\": [\"31534133\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding site or mechanism of NO-mediated Nav1.9 activation not identified\", \"Translational relevance to human MOH not clinically validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for G-protein modulation and NO activation of Nav1.9, the identity of the specific Gβγ or Gα subunit that directly acts on the channel, and whether Nav1.9-selective pharmacology can be achieved for therapeutic targeting of pain and itch.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of Nav1.9 available\", \"No Nav1.9-selective small-molecule inhibitor reported\", \"Direct G-protein binding site on the channel not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 4, 7, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 6, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 8, 10, 18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CNTN1\",\n      \"FHF1B\",\n      \"SCN1B\",\n      \"SCN2B\",\n      \"TNC\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}