{"gene":"NALCN","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2007,"finding":"NALCN forms a voltage-independent, nonselective cation channel that constitutes the TTX- and Cs+-resistant background Na+ leak conductance in neurons. Knockout mice lack this leak current in hippocampal neurons, have disrupted respiratory rhythm, and die within 24 hours of birth; resting membrane potentials of mutant neurons are insensitive to changes in extracellular Na+ concentration.","method":"Genetic knockout (NALCN null mice), whole-cell patch-clamp electrophysiology, brainstem-spinal cord recordings","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with defined electrophysiological phenotype (absent leak current), confirmed in multiple neuron types, foundational study replicated by multiple subsequent labs","pmids":["17448995"],"is_preprint":false},{"year":2008,"finding":"Substance P (via TACR1) and neurotensin activate a cation channel complex containing NALCN and UNC-80 in hippocampal and VTA neurons. The activation by substance P is G-protein-independent but requires Src family kinases.","method":"Whole-cell patch-clamp in native neurons and heterologous systems, pharmacological dissection (G-protein inhibitors, Src inhibitors), Co-immunoprecipitation of NALCN/UNC-80 complex","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP identifying complex, electrophysiology in native neurons with pharmacological dissection, replicated with multiple neuropeptides","pmids":["19092807"],"is_preprint":false},{"year":2009,"finding":"UNC80 binds Src kinases and recruits Src into the NALCN channel complex, providing the molecular scaffold for G-protein-independent activation of NALCN by GPCRs.","method":"Co-immunoprecipitation (UNC80 pulldown of Src kinases), biochemical complex analysis","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing UNC80-Src interaction, single lab but consistent with functional data from companion papers","pmids":["19535918"],"is_preprint":false},{"year":2009,"finding":"NALCN is activated by M3 muscarinic receptors in a pancreatic beta-cell line. The current is Na+-selective, TTX-resistant, G-protein-independent, and Src-dependent. NALCN and M3R form a protein complex involving the intracellular I-II loop of NALCN and the i3 loop of M3R.","method":"Whole-cell patch-clamp in MIN6 cells and HEK-293 cells, Xenopus oocyte expression, Co-immunoprecipitation","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — electrophysiology in native cells confirmed in two heterologous systems, Co-IP identifying complex domain interactions, multiple orthogonal methods in single study","pmids":["19575010"],"is_preprint":false},{"year":2010,"finding":"Lowering extracellular Ca2+ activates a NALCN-dependent Na+ leak current (I_L-Na) in hippocampal neurons. This coupling requires a Ca2+-sensing GPCR, G-protein activation, UNC80 bridging NALCN to UNC79, and the last amino acid of NALCN's intracellular C-terminal tail. In nalcn and unc79 knockout neurons, I_L-Na is insensitive to changes in extracellular Ca2+.","method":"Whole-cell patch-clamp in cultured hippocampal neurons from knockout mice, pharmacological GPCR/G-protein dissection, molecular deletion of NALCN C-terminal tail","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO of NALCN and UNC79 with defined electrophysiological phenotype, domain-mapping of C-terminal requirement, multiple orthogonal approaches","pmids":["21040849"],"is_preprint":false},{"year":2013,"finding":"NALCN has alternatively spliced isoforms producing selectivity filter variants: EEEE (calcium channel-like), EKEE, and EEKE (sodium channel-like). Alternative splicing at the high-field-strength site in the pore determines ion selectivity between sodium and calcium.","method":"Molecular cloning of alternative splice isoforms, sequence analysis across species, transfection in HEK-293T cells (though no discriminable NALCN current above background was detected in heterologous system)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — molecular identification of isoforms replicated across invertebrate species; functional distinction from background could not be confirmed in HEK293T cells; structural/selectivity inference based on pore residue identity","pmids":["23383067"],"is_preprint":false},{"year":2015,"finding":"De novo missense mutations in NALCN pore-forming S5/S6 segments (CLIFAHDD syndrome) nearly abolish wild-type NALCN expression in vitro, suggesting a dominant-negative mechanism, distinct from recessive loss-of-function mutations outside the pore that cause IHPRF.","method":"In vitro functional expression studies (transfection), exome sequencing, molecular-inversion probe screening","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — in vitro functional studies showing dominant-negative effect, mutation location in pore domains confirmed across 14 families","pmids":["25683120"],"is_preprint":false},{"year":2015,"finding":"Introducing the human NALCN p.R1181Q gain-of-function mutation into the C. elegans NALCN homologue nca-1 produces a coiling locomotion phenotype identical to established gain-of-function nca alleles, establishing this mutation as conferring gain-of-function properties to the channel.","method":"Genetic introduction of orthologous mutation in C. elegans, behavioral phenotype analysis","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via orthologous mutation in C. elegans with defined behavioral phenotype, single lab","pmids":["25864427"],"is_preprint":false},{"year":2016,"finding":"CLIFAHDD-causing mutations in NALCN divide into gain-of-function and loss-of-function categories when engineered into C. elegans nca ortholog by CRISPR-Cas9: half phenocopy gain-of-function (hypercontraction) and half phenocopy loss-of-function mutants.","method":"CRISPR-Cas9 engineering of human mutations into C. elegans NCA, behavioral phenotyping","journal":"Neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR-Cas9 introduction of multiple patient variants, epistatic characterization in model organism, single lab","pmids":["27558372"],"is_preprint":false},{"year":2016,"finding":"NALCN is expressed in CO2/H+-sensitive RTN neurons and provides the leak Na+ current that supports their tonic firing. shRNA depletion of Nalcn hyperpolarizes RTN neurons, reduces leak Na+ current and firing rate, and decreases substance P-evoked activation (but not serotonin or pH-sensitive K+ currents). In vivo RTN-specific Nalcn knockdown reduces CO2-evoked neuronal activation and breathing.","method":"shRNA knockdown in vivo and ex vivo, whole-cell patch-clamp, in vivo plethysmography, immunohistochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KD with defined electrophysiological and behavioral phenotypes, multiple orthogonal methods","pmids":["27488637"],"is_preprint":false},{"year":2016,"finding":"NALCN is expressed in SNr GABAergic neurons and is required for their spontaneous tonic firing. SNr neurons lacking NALCN have impaired spontaneous activity. NALCN also mediates excitability modulation by glycolytic changes and by muscarinic acetylcholine receptor activation in SNr neurons.","method":"Single-cell RNA sequencing to identify NALCN expression, conditional NALCN knockout, whole-cell patch-clamp","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — scRNAseq + conditional KO with defined electrophysiological phenotype and pharmacological validation, multiple approaches in one study","pmids":["27177420"],"is_preprint":false},{"year":2018,"finding":"D2 dopamine receptor activation inhibits NALCN-mediated sodium leak currents in dopaminergic neurons through a G-protein-dependent mechanism (blocked by intracellular GDP-βS). GABA-B receptor activation also inhibits NALCN currents. NALCN is required for spontaneous pacemaking in dopaminergic neurons; conditional NALCN knockout neurons are predominantly silent.","method":"Whole-cell patch-clamp in wild-type vs. NALCN conditional knockout dopaminergic neurons, pharmacological GPCR activation, GDP-βS intracellular dialysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with electrophysiology, pharmacological dissection of G-protein dependence, multiple receptor systems tested","pmids":["30556810"],"is_preprint":false},{"year":2018,"finding":"NALCN contributes to myometrial excitability and parturition. Smooth-muscle-specific NALCN knockout mice have reduced myometrial excitability (shortened action potential bursts) and increased rate of abnormal/dysfunctional labor.","method":"Smooth-muscle-specific conditional knockout (NALCNfx/fx × MHCCre mice), sharp electrode current clamp recordings, labor outcome monitoring","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined electrophysiological and functional phenotype, multiple gestational timepoints examined","pmids":["30021195"],"is_preprint":false},{"year":2019,"finding":"IHPRF missense mutation p.W1287L results in loss of NALCN current (loss-of-function), while CLIFAHDD mutations p.L509S and p.Y578S produce higher NALCN current densities and slower inactivation (gain-of-function). Wild-type NALCN current shows Na+-dependence, Gd3+ block, TTX resistance, potentiation by low extracellular Ca2+, and voltage-sensitive inactivation.","method":"Heterologous expression in neuronal NG108-15 cell line, whole-cell patch-clamp electrophysiology with disease variant comparison","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro electrophysiological characterization of WT and disease variants in neuronal cells, multiple variants tested with biophysical characterization","pmids":["31409833"],"is_preprint":false},{"year":2019,"finding":"PRMT7-mediated arginine methylation at Arg1653 of NALCN suppresses channel activity. Loss of PRMT7 increases NALCN activity by shifting extracellular Ca2+ dose-response toward inhibition, and methylation of Arg1653 modulates adjacent Ser1652 phosphorylation by CaSR/PKC-delta, thereby linking extracellular Ca2+ sensing to NALCN suppression.","method":"In vitro methylation assay (PRMT7 methylates NALCN Arg1653), electrophysiology in PRMT7-/- neurons, site-directed mutagenesis of Arg1653/Ser1652, PKC inhibitor treatment, HEK293T overexpression","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro methylation assay with mutagenesis, KO mouse electrophysiology, PKC inhibitor validation; single lab","pmids":["31601786"],"is_preprint":false},{"year":2020,"finding":"Robust functional NALCN expression in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A. The resulting NALCN channel complex is constitutively active, conducts monovalent cations, is blocked by physiological concentrations of extracellular divalent cations (Ca2+/Mg2+), and is modulated by voltage despite fewer voltage-sensing residues than canonical voltage-gated channels.","method":"Heterologous expression in Xenopus oocytes with systematic subunit co-expression, two-electrode voltage-clamp, pharmacology","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of functional channel with systematic subunit requirements, two-electrode voltage clamp with pharmacological characterization, multiple orthogonal experiments","pmids":["32494638"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of rat NALCN and mouse FAM155A complex resolved at 2.7 Å. The non-canonical selectivity filter architecture dictates sodium selectivity and calcium block. Asymmetric arrangement of two functional voltage sensors explains voltage modulation. FAM155A interacts with NALCN through an extracellular cysteine-rich domain.","method":"Cryo-EM structure determination at 2.7 Å resolution","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure at near-atomic resolution defining selectivity filter architecture and voltage sensor arrangement, structural basis for calcium block and sodium selectivity established","pmids":["33273469"],"is_preprint":false},{"year":2020,"finding":"UNC80 and UNC79 are bona fide subunits of the NALCN complex. UNC80 knockout mice are neonatal lethal. The C-terminus of UNC80 contains a domain that interacts with UNC79 and overcomes a soma-retention signal to achieve dendritic localization of the NALCN complex. UNC80 truncations lacking this C-terminal domain (as found in human patients) maintain whole-cell NALCN currents but abolish dendritic localization.","method":"UNC80 conditional knockout mice (neonatal lethality), whole-cell patch-clamp, domain deletion analysis, subcellular localization (dendritic vs. somatic), Co-immunoprecipitation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO lethality, domain dissection identifying UNC79-interaction and dendritic targeting domains, electrophysiology, and localization experiments in one study","pmids":["32620897"],"is_preprint":false},{"year":2021,"finding":"TRPC3 and NALCN channels together generate the sustained inward current responsible for subthreshold slow depolarization and pacemaking in substantia nigra dopaminergic neurons. NALCN compensates for loss of TRPC3 (NALCN mRNA, protein, and current are upregulated in TRPC3 KO mice); blocking NALCN abolishes pacemaking in both WT and TRPC3 KO mice.","method":"TRPC3 KO mice, pharmacological blockade of TRPC3 and NALCN separately, whole-cell patch-clamp, qPCR/western blot for compensatory upregulation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — dual channel KO/pharmacology with compensatory upregulation analysis, multiple orthogonal methods, single lab","pmids":["34409942"],"is_preprint":false},{"year":2021,"finding":"NALCN conducts a Ca2+/Gd3+-sensitive, TTX-resistant Na+ background current in pituitary GH3 cells. NALCN knockdown hyperpolarizes the resting membrane potential, alters electrical properties, and inhibits prolactin secretion; NALCN overexpression has opposite effects.","method":"shRNA knockdown, NALCN overexpression, whole-cell patch-clamp, secretion assay in GH3 cells","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with defined electrophysiological and secretory phenotypes; single lab","pmids":["33793981"],"is_preprint":false},{"year":2021,"finding":"Na+ entering through NALCN acts as an intracellular signaling molecule that activates the Na+-activated K+ channel SLO2.1. NALCN and SLO2.1 are in close proximity in myometrial smooth muscle cells and functionally couple to regulate membrane potential: decreased SLO2.1/NALCN activity induces membrane depolarization and Ca2+ entry to promote contraction.","method":"Proximity ligation assay (NALCN and SLO2.1 co-localization), pharmacological dissection, patch-clamp in MSMCs","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — proximity assay showing co-localization, pharmacological functional coupling evidence; mechanism proposed from indirect data, single lab","pmids":["34746693"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of the mammalian NALCN-FAM155A-UNC79-UNC80 quaternary complex. UNC79-UNC80 form a pillar-shaped heterodimer tethered to the intracellular face of NALCN through tripartite interactions with cytoplasmic loops. Two of three interactions are essential for cell surface localization of NALCN; one interaction relieves NALCN self-inhibition by pulling the auto-inhibitory CTD Interacting Helix (CIH) out of its binding site.","method":"Cryo-EM structure of quaternary complex, mutagenesis of interaction interfaces, cell surface expression assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure of complete channel complex with mutagenesis validating interaction-based mechanisms for surface localization and self-inhibition relief","pmids":["35550517"],"is_preprint":false},{"year":2022,"finding":"NALCN loss-of-function increases circulating tumor cells and metastasis in gastric, intestinal, and pancreatic adenocarcinoma mouse models, and also causes shedding of normal epithelial cells into blood in non-tumor-bearing mice, demonstrating NALCN regulates cell shedding from solid tissues independent of malignancy.","method":"Tissue-specific conditional Nalcn knockout in multiple mouse cancer models, gadolinium (NALCN channel blocker) pharmacological treatment, CTC enumeration, histological analysis of distant organs","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in multiple tissue types, pharmacological validation with gadolinium, non-cancer control animals also examined; multiple orthogonal approaches","pmids":["36175792"],"is_preprint":false},{"year":2023,"finding":"NALCN-mediated Na+ influx in metastatic prostate cancer cells initiates Ca2+ oscillations via a signaling chain including plasmalemmal and mitochondrial Na+/Ca2+ exchangers, SERCA, and store-operated channels. This cascade promotes Src kinase activity (co-localized with NALCN), actin remodeling, secretion of proteolytic enzymes, and invasive potential in vitro and in vivo.","method":"In vitro invasion assays, Ca2+ imaging, ion channel pharmacology, NALCN silencing, in vivo metastasis model, proximity co-localization of NALCN and Src","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vitro and in vivo approaches, Ca2+ signaling cascade dissected pharmacologically; mechanistic chain is detailed but complex with some inferred steps, single lab","pmids":["37278161"],"is_preprint":false},{"year":2023,"finding":"NALCN-encoded Na+ leak currents are similar in amplitude during day and night in SCN neurons, but differentially modulate daytime (not nighttime) repetitive firing rates. In vivo conditional NALCN knockout selectively reduces daytime firing rates. The effect of NALCN on SCN firing depends on K+ current-driven rhythmic changes in input resistance (dynamic clamp manipulation).","method":"In vivo conditional knockout, whole-cell patch-clamp in acute SCN slices, dynamic clamp manipulation of Na+ and K+ currents","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with electrophysiology and dynamic clamp to dissect interaction with K+ currents, multiple neuron subtypes examined","pmids":["37339878"],"is_preprint":false},{"year":2024,"finding":"In dorsal cochlear nucleus cartwheel interneurons, NALCN is required for spontaneous firing. Activation of α2-adrenergic receptors inhibits NALCN and suppresses spontaneous firing (effect absent in glycinergic neuron-specific NALCN knockout). GABA-B receptors also inhibit NALCN, acting on the same population of channels as α2 receptors. α2-dependent enhancement of synaptic strength also requires NALCN.","method":"Glycinergic neuron-specific NALCN conditional knockout, whole-cell patch-clamp, pharmacological receptor activation/blockade","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific KO with defined electrophysiological phenotypes and pharmacological characterization of receptor coupling, two receptor systems dissected","pmids":["38197879"],"is_preprint":false},{"year":2025,"finding":"Neuronal SNARE proteins syntaxin and SNAP25 physically interact with and inhibit NALCN channel complex activity. This interaction was demonstrated in both heterologous systems and primary neurons, and reduction of NALCN currents is sufficient to promote cell survival in syntaxin-depleted cells.","method":"Co-immunoprecipitation (syntaxin/SNAP25 interaction with NALCN complex), electrophysiology in heterologous systems and primary neurons, cell viability assays in syntaxin-depleted cells","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction and functional inhibition demonstrated in two systems (heterologous and primary neurons); cell survival rescue by NALCN reduction adds functional validation; single lab","pmids":["40085699"],"is_preprint":false},{"year":2020,"finding":"Hormone regulation of NALCN in myometrial smooth muscle: progesterone increases NALCN mRNA (5.6-fold) and protein expression and enhances NALCN-dependent leak current, while estrogen decreases NALCN expression (2.3-fold) and inhibits the leak current. Progesterone response elements (PREs) in the NALCN promoter mediate this regulation (confirmed by luciferase assays), but the estrogen response element (ERE) does not contribute.","method":"qRT-PCR, western blot, patch-clamp electrophysiology, promoter luciferase reporter assay in human MSMCs","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — hormone regulation confirmed by multiple methods (expression + functional + promoter reporter); single lab, single cell type","pmids":["31935111"],"is_preprint":false},{"year":2018,"finding":"Substance P activates NALCN current in spino-parabrachial projection neurons through downstream Src kinase signaling. Genetic deletion of NALCN prevents substance P-evoked action potential discharge in these nociceptive projection neurons and reduces intrinsic excitability.","method":"NALCN conditional knockout, whole-cell patch-clamp in lamina I spino-PB neurons, pharmacological Src kinase inhibition","journal":"Pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined electrophysiological phenotype, pharmacological dissection of Src kinase pathway in nociceptive neurons; single lab","pmids":["29746349"],"is_preprint":false}],"current_model":"NALCN is a voltage-independent, nonselective cation channel (member of the 4-domain voltage-gated channel superfamily) that generates a constitutive background Na+ leak conductance in neurons and other excitable cells; it assembles as a quaternary complex with obligatory auxiliary subunits FAM155A (extracellular, cysteine-rich), UNC80 (cytoplasmic scaffold that bridges to UNC79 and recruits Src kinases), and UNC79 (cytoplasmic), whose cryo-EM structures reveal that UNC79-UNC80 relieve NALCN auto-inhibition by displacing an inhibitory C-terminal helix and are required for plasma membrane trafficking; the channel is tonically blocked by physiological extracellular Ca2+ and Mg2+ at the selectivity filter (EEKE motif dictating Na+ selectivity), is potentiated when extracellular Ca2+ falls via a CaSR-Gprotein-UNC80-NALCN tail pathway, and is upregulated by neuropeptides (substance P, neurotensin) and muscarinic agonists through GPCR-independent, Src kinase-dependent mechanisms while being inhibited by Gi/o-coupled receptors (D2R, GABA-B, α2-adrenergic) through G-protein-dependent pathways and by SNARE proteins syntaxin/SNAP25; channel activity is additionally regulated by PRMT7-mediated arginine methylation at Arg1653, which modulates adjacent Ser1652 phosphorylation by CaSR/PKC-δ; physiologically, NALCN controls resting membrane potential and tonic firing in brainstem respiratory pacemaker neurons, dopaminergic neurons, SNr GABAergic neurons, SCN circadian neurons, cartwheel auditory interneurons, pituitary endocrine cells, and myometrial smooth muscle, and its loss-of-function increases epithelial cell shedding and cancer metastasis."},"narrative":{"mechanistic_narrative":"NALCN is the pore-forming subunit of a voltage-independent, nonselective cation channel that generates the TTX- and Cs+-resistant background Na+ leak conductance setting resting membrane potential and supporting tonic/pacemaker firing across diverse excitable cells [PMID:17448995]. Functional reconstitution requires an obligate quaternary assembly with the extracellular cysteine-rich FAM155A and the cytoplasmic scaffolds UNC80 and UNC79, which together render the channel constitutively active, permit cell-surface trafficking, and gate its sensitivity to extracellular divalent cations [PMID:32494638, PMID:32620897]. Cryo-EM structures show that a non-canonical selectivity filter dictates Na+ selectivity and Ca2+/Mg2+ block, that an asymmetric pair of voltage sensors confers weak voltage modulation, and that the UNC79-UNC80 heterodimer tethers to cytoplasmic loops to relieve auto-inhibition by extracting the channel's own C-terminal interacting helix [PMID:33273469, PMID:35550517]. The channel is bidirectionally tuned by neuromodulators: substance P, neurotensin, and muscarinic (M3) agonists potentiate NALCN through G-protein-independent, Src-kinase-dependent signaling scaffolded by UNC80, whereas Gi/o-coupled receptors (D2R, GABA-B, alpha2-adrenergic) and the SNARE proteins syntaxin/SNAP25 inhibit it [PMID:19092807, PMID:19575010, PMID:19535918, PMID:30556810, PMID:38197879, PMID:40085699]. Falling extracellular Ca2+ activates NALCN via a Ca2+-sensing GPCR–G-protein–UNC80 pathway acting on the channel's C-terminal tail, and PRMT7-mediated methylation of Arg1653 coupled to CaSR/PKC-delta phosphorylation of Ser1652 suppresses activity [PMID:21040849, PMID:31601786]. Physiologically NALCN drives firing of brainstem respiratory/RTN, dopaminergic, SNr GABAergic, SCN circadian, and cochlear cartwheel neurons, sustains pituitary prolactin secretion and myometrial excitability, and its loss-of-function promotes epithelial cell shedding and cancer metastasis [PMID:27488637, PMID:27177420, PMID:30556810, PMID:34409942, PMID:37339878, PMID:38197879, PMID:33793981, PMID:30021195, PMID:36175792]. Distinct human disease alleles act through opposing biophysical mechanisms: recessive loss-of-function variants cause IHPRF while de novo pore-domain mutations confer gain- or loss-of-function in CLIFAHDD syndrome [PMID:25683120, PMID:31409833].","teleology":[{"year":2007,"claim":"Established that NALCN is the molecular basis of the long-postulated neuronal background Na+ leak conductance that sets resting potential, answering what gene underlies tonic depolarizing drive.","evidence":"NALCN-null mice with whole-cell patch-clamp in hippocampal neurons and brainstem recordings","pmids":["17448995"],"confidence":"High","gaps":["Did not define auxiliary subunits or molecular regulation","No structural basis for ion selectivity"]},{"year":2008,"claim":"Showed NALCN is not a static leak channel but is dynamically activated by neuropeptides via a G-protein-independent, Src-dependent route, revealing a novel non-canonical GPCR signaling mode.","evidence":"Patch-clamp in native neurons plus pharmacology and Co-IP of NALCN/UNC-80","pmids":["19092807"],"confidence":"High","gaps":["Did not identify the scaffold linking GPCRs to Src","Direct phosphorylation target on NALCN unmapped"]},{"year":2009,"claim":"Identified UNC80 as the scaffold recruiting Src into the complex and extended Src-dependent activation to M3 muscarinic receptors, explaining how GPCRs reach NALCN without G-proteins.","evidence":"Co-IP of UNC80-Src; patch-clamp in MIN6/HEK/oocytes and Co-IP mapping M3R i3 loop to NALCN I-II loop","pmids":["19535918","19575010"],"confidence":"Medium","gaps":["Single-lab Co-IP for UNC80-Src","Stoichiometry and direct phosphosites not defined"]},{"year":2010,"claim":"Defined how extracellular Ca2+ controls NALCN, showing a Ca2+-sensing GPCR signals through UNC80/UNC79 to the channel C-terminal tail, connecting ambient divalent levels to leak current.","evidence":"Patch-clamp in NALCN and UNC79 knockout neurons with GPCR/G-protein pharmacology and C-terminal deletion","pmids":["21040849"],"confidence":"High","gaps":["Identity of the Ca2+-sensing receptor in neurons not fully resolved","Tail residue mechanism structurally undefined"]},{"year":2013,"claim":"Demonstrated that alternative splicing of pore selectivity-filter residues (EEEE/EKEE/EEKE) could tune Na+ versus Ca2+ selectivity, addressing the structural determinant of permeation.","evidence":"Molecular cloning and sequence analysis across species; HEK293T transfection","pmids":["23383067"],"confidence":"Medium","gaps":["No discriminable current above background in heterologous cells","Functional selectivity differences not directly measured"]},{"year":2015,"claim":"Linked NALCN to human disease and showed disease mechanism depends on mutation location, with dominant pore mutations (CLIFAHDD) acting dominant-negatively versus recessive non-pore loss-of-function (IHPRF).","evidence":"Exome sequencing across families plus in vitro expression studies; orthologous mutation in C. elegans nca-1 with behavioral phenotyping","pmids":["25683120","25864427"],"confidence":"Medium","gaps":["Dominant-negative inferred from reduced expression, not biophysics","Genotype-phenotype mapping incomplete"]},{"year":2016,"claim":"Resolved that CLIFAHDD alleles split into gain- and loss-of-function classes and that NALCN sustains tonic firing in specific neuron populations (RTN chemosensory and SNr GABAergic).","evidence":"CRISPR knock-in of patient variants in C. elegans; shRNA/conditional KO with patch-clamp and in vivo plethysmography","pmids":["27558372","27488637","27177420"],"confidence":"High","gaps":["C. elegans phenotypes are surrogate for human channel biophysics","Circuit-level consequences not fully mapped"]},{"year":2018,"claim":"Established bidirectional GPCR control and expanded the physiological roster, showing Gi/o receptors inhibit NALCN G-protein-dependently while NALCN drives dopaminergic pacemaking, nociceptive excitability, and myometrial contractility.","evidence":"Conditional KO with patch-clamp and GDP-beta-S dialysis; spino-PB neuron recordings with Src inhibition; smooth-muscle-specific KO with labor monitoring","pmids":["30556810","29746349","30021195"],"confidence":"High","gaps":["Effectors linking G-proteins to channel inhibition undefined","Tissue-specific subunit composition unclear"]},{"year":2019,"claim":"Provided direct biophysical characterization of WT and disease variants and identified a covalent regulatory layer (PRMT7 arginine methylation coupled to CaSR/PKC-delta phosphorylation) tuning the channel.","evidence":"Patch-clamp of WT/IHPRF/CLIFAHDD variants in NG108-15 cells; in vitro methylation assay, PRMT7-/- electrophysiology, site-directed mutagenesis","pmids":["31409833","31601786"],"confidence":"High","gaps":["PRMT7 pathway from single lab","How methylation/phosphorylation alter gating structurally unknown"]},{"year":2020,"claim":"Achieved functional reconstitution and near-atomic structures, defining FAM155A/UNC80/UNC79 as obligate subunits and the selectivity-filter and voltage-sensor architecture, plus UNC80's role in dendritic targeting.","evidence":"Systematic subunit co-expression with two-electrode voltage-clamp; cryo-EM of NALCN-FAM155A at 2.7 A; UNC80 conditional KO with domain dissection and localization; hormone promoter-reporter analysis","pmids":["32494638","33273469","32620897","31935111"],"confidence":"High","gaps":["Full quaternary architecture not yet resolved","Hormone regulation shown in single cell type"]},{"year":2021,"claim":"Extended NALCN's roles to pituitary secretion, SN dopaminergic pacemaking jointly with TRPC3, and downstream Na+-dependent signaling to SLO2.1 and Ca2+ handling, framing NALCN as a signaling hub beyond passive leak.","evidence":"shRNA/overexpression with patch-clamp and secretion assays in GH3 cells; TRPC3 KO with pharmacology and compensatory expression analysis; proximity ligation and pharmacology in myometrial cells","pmids":["33793981","34409942","34746693"],"confidence":"Medium","gaps":["NALCN-SLO2.1 coupling inferred from proximity/pharmacology","Compensatory mechanisms not generalized across tissues"]},{"year":2022,"claim":"Delivered the complete quaternary cryo-EM mechanism, showing UNC79-UNC80 tether to cytoplasmic loops to both enable surface trafficking and relieve auto-inhibition by displacing the CTD interacting helix; also linked NALCN loss to cell shedding and metastasis.","evidence":"Cryo-EM of NALCN-FAM155A-UNC79-UNC80 with interface mutagenesis and surface-expression assays; conditional Nalcn KO in multiple cancer models with gadolinium treatment","pmids":["35550517","36175792"],"confidence":"High","gaps":["Conformational changes during gating not captured","Mechanism linking channel activity to epithelial shedding unresolved"]},{"year":2023,"claim":"Detailed a NALCN-initiated Na+/Ca2+ signaling cascade driving cancer invasion and characterized circadian, time-of-day-specific control of SCN firing, deepening physiological and pathological mechanism.","evidence":"Ca2+ imaging, invasion assays, NALCN silencing and in vivo metastasis with NALCN-Src co-localization; 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Na+ Leak Currents on the Repetitive Firing Properties of SCN Neurons Depend on K+-Driven Rhythmic Changes in Input Resistance.","date":"2023","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37339878","citation_count":3,"is_preprint":false},{"pmid":"39766220","id":"PMC_39766220","title":"NALCN Promoter Methylation as a Biomarker for Metastatic Risk in a Cohort of Non-Small Cell Lung Cancer Patients.","date":"2024","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/39766220","citation_count":2,"is_preprint":false},{"pmid":"39722796","id":"PMC_39722796","title":"Widening the infantile hypotonia with psychomotor retardation and characteristic Facies-1 Syndrome's clinical and molecular spectrum through NALCN in-silico structural analysis.","date":"2024","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39722796","citation_count":2,"is_preprint":false},{"pmid":"38287929","id":"PMC_38287929","title":"NALCN Channels Are Not Major targets of Gα o or Gα q Modulation in the C. elegans Egg-Laying Behavior Circuit.","date":"2024","source":"microPublication biology","url":"https://pubmed.ncbi.nlm.nih.gov/38287929","citation_count":2,"is_preprint":false},{"pmid":"38873579","id":"PMC_38873579","title":"Case Report: New presentation of CLIFAHDD syndrome with a novel variant in the NALCN gene and a literature review.","date":"2024","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/38873579","citation_count":2,"is_preprint":false},{"pmid":"39620829","id":"PMC_39620829","title":"The background sodium leak channel NALCN is a major controlling factor in pituitary cell excitability.","date":"2024","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/39620829","citation_count":2,"is_preprint":false},{"pmid":"40085699","id":"PMC_40085699","title":"The sodium leak channel NALCN is regulated by neuronal SNARE complex proteins.","date":"2025","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/40085699","citation_count":1,"is_preprint":false},{"pmid":"37046053","id":"PMC_37046053","title":"Novel NALCN variant linked to temporal lobe epilepsy.","date":"2023","source":"American journal of medical genetics. 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Knockout mice lack this leak current in hippocampal neurons, have disrupted respiratory rhythm, and die within 24 hours of birth; resting membrane potentials of mutant neurons are insensitive to changes in extracellular Na+ concentration.\",\n      \"method\": \"Genetic knockout (NALCN null mice), whole-cell patch-clamp electrophysiology, brainstem-spinal cord recordings\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with defined electrophysiological phenotype (absent leak current), confirmed in multiple neuron types, foundational study replicated by multiple subsequent labs\",\n      \"pmids\": [\"17448995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Substance P (via TACR1) and neurotensin activate a cation channel complex containing NALCN and UNC-80 in hippocampal and VTA neurons. The activation by substance P is G-protein-independent but requires Src family kinases.\",\n      \"method\": \"Whole-cell patch-clamp in native neurons and heterologous systems, pharmacological dissection (G-protein inhibitors, Src inhibitors), Co-immunoprecipitation of NALCN/UNC-80 complex\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP identifying complex, electrophysiology in native neurons with pharmacological dissection, replicated with multiple neuropeptides\",\n      \"pmids\": [\"19092807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"UNC80 binds Src kinases and recruits Src into the NALCN channel complex, providing the molecular scaffold for G-protein-independent activation of NALCN by GPCRs.\",\n      \"method\": \"Co-immunoprecipitation (UNC80 pulldown of Src kinases), biochemical complex analysis\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing UNC80-Src interaction, single lab but consistent with functional data from companion papers\",\n      \"pmids\": [\"19535918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NALCN is activated by M3 muscarinic receptors in a pancreatic beta-cell line. The current is Na+-selective, TTX-resistant, G-protein-independent, and Src-dependent. NALCN and M3R form a protein complex involving the intracellular I-II loop of NALCN and the i3 loop of M3R.\",\n      \"method\": \"Whole-cell patch-clamp in MIN6 cells and HEK-293 cells, Xenopus oocyte expression, Co-immunoprecipitation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in native cells confirmed in two heterologous systems, Co-IP identifying complex domain interactions, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19575010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Lowering extracellular Ca2+ activates a NALCN-dependent Na+ leak current (I_L-Na) in hippocampal neurons. This coupling requires a Ca2+-sensing GPCR, G-protein activation, UNC80 bridging NALCN to UNC79, and the last amino acid of NALCN's intracellular C-terminal tail. In nalcn and unc79 knockout neurons, I_L-Na is insensitive to changes in extracellular Ca2+.\",\n      \"method\": \"Whole-cell patch-clamp in cultured hippocampal neurons from knockout mice, pharmacological GPCR/G-protein dissection, molecular deletion of NALCN C-terminal tail\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO of NALCN and UNC79 with defined electrophysiological phenotype, domain-mapping of C-terminal requirement, multiple orthogonal approaches\",\n      \"pmids\": [\"21040849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NALCN has alternatively spliced isoforms producing selectivity filter variants: EEEE (calcium channel-like), EKEE, and EEKE (sodium channel-like). Alternative splicing at the high-field-strength site in the pore determines ion selectivity between sodium and calcium.\",\n      \"method\": \"Molecular cloning of alternative splice isoforms, sequence analysis across species, transfection in HEK-293T cells (though no discriminable NALCN current above background was detected in heterologous system)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — molecular identification of isoforms replicated across invertebrate species; functional distinction from background could not be confirmed in HEK293T cells; structural/selectivity inference based on pore residue identity\",\n      \"pmids\": [\"23383067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"De novo missense mutations in NALCN pore-forming S5/S6 segments (CLIFAHDD syndrome) nearly abolish wild-type NALCN expression in vitro, suggesting a dominant-negative mechanism, distinct from recessive loss-of-function mutations outside the pore that cause IHPRF.\",\n      \"method\": \"In vitro functional expression studies (transfection), exome sequencing, molecular-inversion probe screening\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — in vitro functional studies showing dominant-negative effect, mutation location in pore domains confirmed across 14 families\",\n      \"pmids\": [\"25683120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Introducing the human NALCN p.R1181Q gain-of-function mutation into the C. elegans NALCN homologue nca-1 produces a coiling locomotion phenotype identical to established gain-of-function nca alleles, establishing this mutation as conferring gain-of-function properties to the channel.\",\n      \"method\": \"Genetic introduction of orthologous mutation in C. elegans, behavioral phenotype analysis\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via orthologous mutation in C. elegans with defined behavioral phenotype, single lab\",\n      \"pmids\": [\"25864427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CLIFAHDD-causing mutations in NALCN divide into gain-of-function and loss-of-function categories when engineered into C. elegans nca ortholog by CRISPR-Cas9: half phenocopy gain-of-function (hypercontraction) and half phenocopy loss-of-function mutants.\",\n      \"method\": \"CRISPR-Cas9 engineering of human mutations into C. elegans NCA, behavioral phenotyping\",\n      \"journal\": \"Neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-Cas9 introduction of multiple patient variants, epistatic characterization in model organism, single lab\",\n      \"pmids\": [\"27558372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NALCN is expressed in CO2/H+-sensitive RTN neurons and provides the leak Na+ current that supports their tonic firing. shRNA depletion of Nalcn hyperpolarizes RTN neurons, reduces leak Na+ current and firing rate, and decreases substance P-evoked activation (but not serotonin or pH-sensitive K+ currents). In vivo RTN-specific Nalcn knockdown reduces CO2-evoked neuronal activation and breathing.\",\n      \"method\": \"shRNA knockdown in vivo and ex vivo, whole-cell patch-clamp, in vivo plethysmography, immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KD with defined electrophysiological and behavioral phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"27488637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NALCN is expressed in SNr GABAergic neurons and is required for their spontaneous tonic firing. SNr neurons lacking NALCN have impaired spontaneous activity. NALCN also mediates excitability modulation by glycolytic changes and by muscarinic acetylcholine receptor activation in SNr neurons.\",\n      \"method\": \"Single-cell RNA sequencing to identify NALCN expression, conditional NALCN knockout, whole-cell patch-clamp\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scRNAseq + conditional KO with defined electrophysiological phenotype and pharmacological validation, multiple approaches in one study\",\n      \"pmids\": [\"27177420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"D2 dopamine receptor activation inhibits NALCN-mediated sodium leak currents in dopaminergic neurons through a G-protein-dependent mechanism (blocked by intracellular GDP-βS). GABA-B receptor activation also inhibits NALCN currents. NALCN is required for spontaneous pacemaking in dopaminergic neurons; conditional NALCN knockout neurons are predominantly silent.\",\n      \"method\": \"Whole-cell patch-clamp in wild-type vs. NALCN conditional knockout dopaminergic neurons, pharmacological GPCR activation, GDP-βS intracellular dialysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with electrophysiology, pharmacological dissection of G-protein dependence, multiple receptor systems tested\",\n      \"pmids\": [\"30556810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NALCN contributes to myometrial excitability and parturition. Smooth-muscle-specific NALCN knockout mice have reduced myometrial excitability (shortened action potential bursts) and increased rate of abnormal/dysfunctional labor.\",\n      \"method\": \"Smooth-muscle-specific conditional knockout (NALCNfx/fx × MHCCre mice), sharp electrode current clamp recordings, labor outcome monitoring\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined electrophysiological and functional phenotype, multiple gestational timepoints examined\",\n      \"pmids\": [\"30021195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IHPRF missense mutation p.W1287L results in loss of NALCN current (loss-of-function), while CLIFAHDD mutations p.L509S and p.Y578S produce higher NALCN current densities and slower inactivation (gain-of-function). Wild-type NALCN current shows Na+-dependence, Gd3+ block, TTX resistance, potentiation by low extracellular Ca2+, and voltage-sensitive inactivation.\",\n      \"method\": \"Heterologous expression in neuronal NG108-15 cell line, whole-cell patch-clamp electrophysiology with disease variant comparison\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro electrophysiological characterization of WT and disease variants in neuronal cells, multiple variants tested with biophysical characterization\",\n      \"pmids\": [\"31409833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PRMT7-mediated arginine methylation at Arg1653 of NALCN suppresses channel activity. Loss of PRMT7 increases NALCN activity by shifting extracellular Ca2+ dose-response toward inhibition, and methylation of Arg1653 modulates adjacent Ser1652 phosphorylation by CaSR/PKC-delta, thereby linking extracellular Ca2+ sensing to NALCN suppression.\",\n      \"method\": \"In vitro methylation assay (PRMT7 methylates NALCN Arg1653), electrophysiology in PRMT7-/- neurons, site-directed mutagenesis of Arg1653/Ser1652, PKC inhibitor treatment, HEK293T overexpression\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro methylation assay with mutagenesis, KO mouse electrophysiology, PKC inhibitor validation; single lab\",\n      \"pmids\": [\"31601786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Robust functional NALCN expression in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A. The resulting NALCN channel complex is constitutively active, conducts monovalent cations, is blocked by physiological concentrations of extracellular divalent cations (Ca2+/Mg2+), and is modulated by voltage despite fewer voltage-sensing residues than canonical voltage-gated channels.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes with systematic subunit co-expression, two-electrode voltage-clamp, pharmacology\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of functional channel with systematic subunit requirements, two-electrode voltage clamp with pharmacological characterization, multiple orthogonal experiments\",\n      \"pmids\": [\"32494638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of rat NALCN and mouse FAM155A complex resolved at 2.7 Å. The non-canonical selectivity filter architecture dictates sodium selectivity and calcium block. Asymmetric arrangement of two functional voltage sensors explains voltage modulation. FAM155A interacts with NALCN through an extracellular cysteine-rich domain.\",\n      \"method\": \"Cryo-EM structure determination at 2.7 Å resolution\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure at near-atomic resolution defining selectivity filter architecture and voltage sensor arrangement, structural basis for calcium block and sodium selectivity established\",\n      \"pmids\": [\"33273469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"UNC80 and UNC79 are bona fide subunits of the NALCN complex. UNC80 knockout mice are neonatal lethal. The C-terminus of UNC80 contains a domain that interacts with UNC79 and overcomes a soma-retention signal to achieve dendritic localization of the NALCN complex. UNC80 truncations lacking this C-terminal domain (as found in human patients) maintain whole-cell NALCN currents but abolish dendritic localization.\",\n      \"method\": \"UNC80 conditional knockout mice (neonatal lethality), whole-cell patch-clamp, domain deletion analysis, subcellular localization (dendritic vs. somatic), Co-immunoprecipitation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO lethality, domain dissection identifying UNC79-interaction and dendritic targeting domains, electrophysiology, and localization experiments in one study\",\n      \"pmids\": [\"32620897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRPC3 and NALCN channels together generate the sustained inward current responsible for subthreshold slow depolarization and pacemaking in substantia nigra dopaminergic neurons. NALCN compensates for loss of TRPC3 (NALCN mRNA, protein, and current are upregulated in TRPC3 KO mice); blocking NALCN abolishes pacemaking in both WT and TRPC3 KO mice.\",\n      \"method\": \"TRPC3 KO mice, pharmacological blockade of TRPC3 and NALCN separately, whole-cell patch-clamp, qPCR/western blot for compensatory upregulation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual channel KO/pharmacology with compensatory upregulation analysis, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"34409942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NALCN conducts a Ca2+/Gd3+-sensitive, TTX-resistant Na+ background current in pituitary GH3 cells. NALCN knockdown hyperpolarizes the resting membrane potential, alters electrical properties, and inhibits prolactin secretion; NALCN overexpression has opposite effects.\",\n      \"method\": \"shRNA knockdown, NALCN overexpression, whole-cell patch-clamp, secretion assay in GH3 cells\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with defined electrophysiological and secretory phenotypes; single lab\",\n      \"pmids\": [\"33793981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Na+ entering through NALCN acts as an intracellular signaling molecule that activates the Na+-activated K+ channel SLO2.1. NALCN and SLO2.1 are in close proximity in myometrial smooth muscle cells and functionally couple to regulate membrane potential: decreased SLO2.1/NALCN activity induces membrane depolarization and Ca2+ entry to promote contraction.\",\n      \"method\": \"Proximity ligation assay (NALCN and SLO2.1 co-localization), pharmacological dissection, patch-clamp in MSMCs\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — proximity assay showing co-localization, pharmacological functional coupling evidence; mechanism proposed from indirect data, single lab\",\n      \"pmids\": [\"34746693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of the mammalian NALCN-FAM155A-UNC79-UNC80 quaternary complex. UNC79-UNC80 form a pillar-shaped heterodimer tethered to the intracellular face of NALCN through tripartite interactions with cytoplasmic loops. Two of three interactions are essential for cell surface localization of NALCN; one interaction relieves NALCN self-inhibition by pulling the auto-inhibitory CTD Interacting Helix (CIH) out of its binding site.\",\n      \"method\": \"Cryo-EM structure of quaternary complex, mutagenesis of interaction interfaces, cell surface expression assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure of complete channel complex with mutagenesis validating interaction-based mechanisms for surface localization and self-inhibition relief\",\n      \"pmids\": [\"35550517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NALCN loss-of-function increases circulating tumor cells and metastasis in gastric, intestinal, and pancreatic adenocarcinoma mouse models, and also causes shedding of normal epithelial cells into blood in non-tumor-bearing mice, demonstrating NALCN regulates cell shedding from solid tissues independent of malignancy.\",\n      \"method\": \"Tissue-specific conditional Nalcn knockout in multiple mouse cancer models, gadolinium (NALCN channel blocker) pharmacological treatment, CTC enumeration, histological analysis of distant organs\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in multiple tissue types, pharmacological validation with gadolinium, non-cancer control animals also examined; multiple orthogonal approaches\",\n      \"pmids\": [\"36175792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NALCN-mediated Na+ influx in metastatic prostate cancer cells initiates Ca2+ oscillations via a signaling chain including plasmalemmal and mitochondrial Na+/Ca2+ exchangers, SERCA, and store-operated channels. This cascade promotes Src kinase activity (co-localized with NALCN), actin remodeling, secretion of proteolytic enzymes, and invasive potential in vitro and in vivo.\",\n      \"method\": \"In vitro invasion assays, Ca2+ imaging, ion channel pharmacology, NALCN silencing, in vivo metastasis model, proximity co-localization of NALCN and Src\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vitro and in vivo approaches, Ca2+ signaling cascade dissected pharmacologically; mechanistic chain is detailed but complex with some inferred steps, single lab\",\n      \"pmids\": [\"37278161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NALCN-encoded Na+ leak currents are similar in amplitude during day and night in SCN neurons, but differentially modulate daytime (not nighttime) repetitive firing rates. In vivo conditional NALCN knockout selectively reduces daytime firing rates. The effect of NALCN on SCN firing depends on K+ current-driven rhythmic changes in input resistance (dynamic clamp manipulation).\",\n      \"method\": \"In vivo conditional knockout, whole-cell patch-clamp in acute SCN slices, dynamic clamp manipulation of Na+ and K+ currents\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with electrophysiology and dynamic clamp to dissect interaction with K+ currents, multiple neuron subtypes examined\",\n      \"pmids\": [\"37339878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In dorsal cochlear nucleus cartwheel interneurons, NALCN is required for spontaneous firing. Activation of α2-adrenergic receptors inhibits NALCN and suppresses spontaneous firing (effect absent in glycinergic neuron-specific NALCN knockout). GABA-B receptors also inhibit NALCN, acting on the same population of channels as α2 receptors. α2-dependent enhancement of synaptic strength also requires NALCN.\",\n      \"method\": \"Glycinergic neuron-specific NALCN conditional knockout, whole-cell patch-clamp, pharmacological receptor activation/blockade\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific KO with defined electrophysiological phenotypes and pharmacological characterization of receptor coupling, two receptor systems dissected\",\n      \"pmids\": [\"38197879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Neuronal SNARE proteins syntaxin and SNAP25 physically interact with and inhibit NALCN channel complex activity. This interaction was demonstrated in both heterologous systems and primary neurons, and reduction of NALCN currents is sufficient to promote cell survival in syntaxin-depleted cells.\",\n      \"method\": \"Co-immunoprecipitation (syntaxin/SNAP25 interaction with NALCN complex), electrophysiology in heterologous systems and primary neurons, cell viability assays in syntaxin-depleted cells\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction and functional inhibition demonstrated in two systems (heterologous and primary neurons); cell survival rescue by NALCN reduction adds functional validation; single lab\",\n      \"pmids\": [\"40085699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hormone regulation of NALCN in myometrial smooth muscle: progesterone increases NALCN mRNA (5.6-fold) and protein expression and enhances NALCN-dependent leak current, while estrogen decreases NALCN expression (2.3-fold) and inhibits the leak current. Progesterone response elements (PREs) in the NALCN promoter mediate this regulation (confirmed by luciferase assays), but the estrogen response element (ERE) does not contribute.\",\n      \"method\": \"qRT-PCR, western blot, patch-clamp electrophysiology, promoter luciferase reporter assay in human MSMCs\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — hormone regulation confirmed by multiple methods (expression + functional + promoter reporter); single lab, single cell type\",\n      \"pmids\": [\"31935111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Substance P activates NALCN current in spino-parabrachial projection neurons through downstream Src kinase signaling. Genetic deletion of NALCN prevents substance P-evoked action potential discharge in these nociceptive projection neurons and reduces intrinsic excitability.\",\n      \"method\": \"NALCN conditional knockout, whole-cell patch-clamp in lamina I spino-PB neurons, pharmacological Src kinase inhibition\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined electrophysiological phenotype, pharmacological dissection of Src kinase pathway in nociceptive neurons; single lab\",\n      \"pmids\": [\"29746349\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NALCN is a voltage-independent, nonselective cation channel (member of the 4-domain voltage-gated channel superfamily) that generates a constitutive background Na+ leak conductance in neurons and other excitable cells; it assembles as a quaternary complex with obligatory auxiliary subunits FAM155A (extracellular, cysteine-rich), UNC80 (cytoplasmic scaffold that bridges to UNC79 and recruits Src kinases), and UNC79 (cytoplasmic), whose cryo-EM structures reveal that UNC79-UNC80 relieve NALCN auto-inhibition by displacing an inhibitory C-terminal helix and are required for plasma membrane trafficking; the channel is tonically blocked by physiological extracellular Ca2+ and Mg2+ at the selectivity filter (EEKE motif dictating Na+ selectivity), is potentiated when extracellular Ca2+ falls via a CaSR-Gprotein-UNC80-NALCN tail pathway, and is upregulated by neuropeptides (substance P, neurotensin) and muscarinic agonists through GPCR-independent, Src kinase-dependent mechanisms while being inhibited by Gi/o-coupled receptors (D2R, GABA-B, α2-adrenergic) through G-protein-dependent pathways and by SNARE proteins syntaxin/SNAP25; channel activity is additionally regulated by PRMT7-mediated arginine methylation at Arg1653, which modulates adjacent Ser1652 phosphorylation by CaSR/PKC-δ; physiologically, NALCN controls resting membrane potential and tonic firing in brainstem respiratory pacemaker neurons, dopaminergic neurons, SNr GABAergic neurons, SCN circadian neurons, cartwheel auditory interneurons, pituitary endocrine cells, and myometrial smooth muscle, and its loss-of-function increases epithelial cell shedding and cancer metastasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NALCN is the pore-forming subunit of a voltage-independent, nonselective cation channel that generates the TTX- and Cs+-resistant background Na+ leak conductance setting resting membrane potential and supporting tonic/pacemaker firing across diverse excitable cells [#0]. Functional reconstitution requires an obligate quaternary assembly with the extracellular cysteine-rich FAM155A and the cytoplasmic scaffolds UNC80 and UNC79, which together render the channel constitutively active, permit cell-surface trafficking, and gate its sensitivity to extracellular divalent cations [#15, #17]. Cryo-EM structures show that a non-canonical selectivity filter dictates Na+ selectivity and Ca2+/Mg2+ block, that an asymmetric pair of voltage sensors confers weak voltage modulation, and that the UNC79-UNC80 heterodimer tethers to cytoplasmic loops to relieve auto-inhibition by extracting the channel's own C-terminal interacting helix [#16, #21]. The channel is bidirectionally tuned by neuromodulators: substance P, neurotensin, and muscarinic (M3) agonists potentiate NALCN through G-protein-independent, Src-kinase-dependent signaling scaffolded by UNC80, whereas Gi/o-coupled receptors (D2R, GABA-B, alpha2-adrenergic) and the SNARE proteins syntaxin/SNAP25 inhibit it [#1, #3, #2, #11, #25, #26]. Falling extracellular Ca2+ activates NALCN via a Ca2+-sensing GPCR–G-protein–UNC80 pathway acting on the channel's C-terminal tail, and PRMT7-mediated methylation of Arg1653 coupled to CaSR/PKC-delta phosphorylation of Ser1652 suppresses activity [#4, #14]. Physiologically NALCN drives firing of brainstem respiratory/RTN, dopaminergic, SNr GABAergic, SCN circadian, and cochlear cartwheel neurons, sustains pituitary prolactin secretion and myometrial excitability, and its loss-of-function promotes epithelial cell shedding and cancer metastasis [#9, #10, #11, #18, #24, #25, #19, #12, #22]. Distinct human disease alleles act through opposing biophysical mechanisms: recessive loss-of-function variants cause IHPRF while de novo pore-domain mutations confer gain- or loss-of-function in CLIFAHDD syndrome [#6, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that NALCN is the molecular basis of the long-postulated neuronal background Na+ leak conductance that sets resting potential, answering what gene underlies tonic depolarizing drive.\",\n      \"evidence\": \"NALCN-null mice with whole-cell patch-clamp in hippocampal neurons and brainstem recordings\",\n      \"pmids\": [\"17448995\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define auxiliary subunits or molecular regulation\", \"No structural basis for ion selectivity\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed NALCN is not a static leak channel but is dynamically activated by neuropeptides via a G-protein-independent, Src-dependent route, revealing a novel non-canonical GPCR signaling mode.\",\n      \"evidence\": \"Patch-clamp in native neurons plus pharmacology and Co-IP of NALCN/UNC-80\",\n      \"pmids\": [\"19092807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the scaffold linking GPCRs to Src\", \"Direct phosphorylation target on NALCN unmapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified UNC80 as the scaffold recruiting Src into the complex and extended Src-dependent activation to M3 muscarinic receptors, explaining how GPCRs reach NALCN without G-proteins.\",\n      \"evidence\": \"Co-IP of UNC80-Src; patch-clamp in MIN6/HEK/oocytes and Co-IP mapping M3R i3 loop to NALCN I-II loop\",\n      \"pmids\": [\"19535918\", \"19575010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP for UNC80-Src\", \"Stoichiometry and direct phosphosites not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined how extracellular Ca2+ controls NALCN, showing a Ca2+-sensing GPCR signals through UNC80/UNC79 to the channel C-terminal tail, connecting ambient divalent levels to leak current.\",\n      \"evidence\": \"Patch-clamp in NALCN and UNC79 knockout neurons with GPCR/G-protein pharmacology and C-terminal deletion\",\n      \"pmids\": [\"21040849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the Ca2+-sensing receptor in neurons not fully resolved\", \"Tail residue mechanism structurally undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that alternative splicing of pore selectivity-filter residues (EEEE/EKEE/EEKE) could tune Na+ versus Ca2+ selectivity, addressing the structural determinant of permeation.\",\n      \"evidence\": \"Molecular cloning and sequence analysis across species; HEK293T transfection\",\n      \"pmids\": [\"23383067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No discriminable current above background in heterologous cells\", \"Functional selectivity differences not directly measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked NALCN to human disease and showed disease mechanism depends on mutation location, with dominant pore mutations (CLIFAHDD) acting dominant-negatively versus recessive non-pore loss-of-function (IHPRF).\",\n      \"evidence\": \"Exome sequencing across families plus in vitro expression studies; orthologous mutation in C. elegans nca-1 with behavioral phenotyping\",\n      \"pmids\": [\"25683120\", \"25864427\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dominant-negative inferred from reduced expression, not biophysics\", \"Genotype-phenotype mapping incomplete\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved that CLIFAHDD alleles split into gain- and loss-of-function classes and that NALCN sustains tonic firing in specific neuron populations (RTN chemosensory and SNr GABAergic).\",\n      \"evidence\": \"CRISPR knock-in of patient variants in C. elegans; shRNA/conditional KO with patch-clamp and in vivo plethysmography\",\n      \"pmids\": [\"27558372\", \"27488637\", \"27177420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"C. elegans phenotypes are surrogate for human channel biophysics\", \"Circuit-level consequences not fully mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established bidirectional GPCR control and expanded the physiological roster, showing Gi/o receptors inhibit NALCN G-protein-dependently while NALCN drives dopaminergic pacemaking, nociceptive excitability, and myometrial contractility.\",\n      \"evidence\": \"Conditional KO with patch-clamp and GDP-beta-S dialysis; spino-PB neuron recordings with Src inhibition; smooth-muscle-specific KO with labor monitoring\",\n      \"pmids\": [\"30556810\", \"29746349\", \"30021195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors linking G-proteins to channel inhibition undefined\", \"Tissue-specific subunit composition unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided direct biophysical characterization of WT and disease variants and identified a covalent regulatory layer (PRMT7 arginine methylation coupled to CaSR/PKC-delta phosphorylation) tuning the channel.\",\n      \"evidence\": \"Patch-clamp of WT/IHPRF/CLIFAHDD variants in NG108-15 cells; in vitro methylation assay, PRMT7-/- electrophysiology, site-directed mutagenesis\",\n      \"pmids\": [\"31409833\", \"31601786\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PRMT7 pathway from single lab\", \"How methylation/phosphorylation alter gating structurally unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Achieved functional reconstitution and near-atomic structures, defining FAM155A/UNC80/UNC79 as obligate subunits and the selectivity-filter and voltage-sensor architecture, plus UNC80's role in dendritic targeting.\",\n      \"evidence\": \"Systematic subunit co-expression with two-electrode voltage-clamp; cryo-EM of NALCN-FAM155A at 2.7 A; UNC80 conditional KO with domain dissection and localization; hormone promoter-reporter analysis\",\n      \"pmids\": [\"32494638\", \"33273469\", \"32620897\", \"31935111\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full quaternary architecture not yet resolved\", \"Hormone regulation shown in single cell type\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended NALCN's roles to pituitary secretion, SN dopaminergic pacemaking jointly with TRPC3, and downstream Na+-dependent signaling to SLO2.1 and Ca2+ handling, framing NALCN as a signaling hub beyond passive leak.\",\n      \"evidence\": \"shRNA/overexpression with patch-clamp and secretion assays in GH3 cells; TRPC3 KO with pharmacology and compensatory expression analysis; proximity ligation and pharmacology in myometrial cells\",\n      \"pmids\": [\"33793981\", \"34409942\", \"34746693\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NALCN-SLO2.1 coupling inferred from proximity/pharmacology\", \"Compensatory mechanisms not generalized across tissues\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Delivered the complete quaternary cryo-EM mechanism, showing UNC79-UNC80 tether to cytoplasmic loops to both enable surface trafficking and relieve auto-inhibition by displacing the CTD interacting helix; also linked NALCN loss to cell shedding and metastasis.\",\n      \"evidence\": \"Cryo-EM of NALCN-FAM155A-UNC79-UNC80 with interface mutagenesis and surface-expression assays; conditional Nalcn KO in multiple cancer models with gadolinium treatment\",\n      \"pmids\": [\"35550517\", \"36175792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational changes during gating not captured\", \"Mechanism linking channel activity to epithelial shedding unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Detailed a NALCN-initiated Na+/Ca2+ signaling cascade driving cancer invasion and characterized circadian, time-of-day-specific control of SCN firing, deepening physiological and pathological mechanism.\",\n      \"evidence\": \"Ca2+ imaging, invasion assays, NALCN silencing and in vivo metastasis with NALCN-Src co-localization; conditional KO with patch-clamp and dynamic clamp in SCN\",\n      \"pmids\": [\"37278161\", \"37339878\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Invasion cascade contains inferred intermediate steps\", \"Directness of NALCN-Src coupling not biochemically resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed NALCN underlies cartwheel interneuron spontaneous firing and is the convergent target of alpha2-adrenergic and GABA-B inhibition, refining receptor-channel convergence.\",\n      \"evidence\": \"Glycinergic-neuron-specific NALCN conditional KO with patch-clamp and receptor pharmacology\",\n      \"pmids\": [\"38197879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Shared inhibitory effector for both receptors not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified SNARE proteins syntaxin/SNAP25 as direct inhibitory partners of NALCN, with functional consequences for cell survival, broadening the channel's regulatory interactome.\",\n      \"evidence\": \"Co-IP plus electrophysiology in heterologous systems and primary neurons; viability assays in syntaxin-depleted cells\",\n      \"pmids\": [\"40085699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Structural basis of SNARE-NALCN inhibition unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse covalent (methylation/phosphorylation), GPCR, and protein-protein inputs are integrated at the channel during gating, and how loss-of-function mechanistically drives epithelial shedding and metastasis, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No gating-state structure capturing regulatory inputs\", \"Tissue-specific subunit/regulator composition incompletely mapped\", \"Mechanistic link from channel activity to cell shedding undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 15, 16, 13]},\n      {\"term_id\": \"GO:0005261\", \"supporting_discovery_ids\": [0, 15]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [4, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [15, 17, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 9, 10, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 3, 11, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 13, 22]}\n    ],\n    \"complexes\": [\n      \"NALCN-FAM155A-UNC80-UNC79 channelosome\"\n    ],\n    \"partners\": [\n      \"FAM155A\",\n      \"UNC80\",\n      \"UNC79\",\n      \"SRC\",\n      \"STX1A\",\n      \"SNAP25\",\n      \"SLO2.1\",\n      \"PRMT7\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}