{"gene":"UNC79","run_date":"2026-04-28T21:43:01","timeline":{"discoveries":[{"year":2007,"finding":"UNC-79 (C. elegans ortholog) controls NA/NALCN protein levels by a posttranscriptional mechanism, and genetic double-mutant epistasis places unc-79 in the same pathway as the NA ion channel in both C. elegans and Drosophila","method":"Genetic epistasis (double mutants), biochemical studies of protein levels, cross-species ortholog analysis","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis plus biochemical protein-level measurements, replicated across two species","pmids":["17350263"],"is_preprint":false},{"year":2008,"finding":"UNC-79 is required for proper localization and function of the NCA-1 channel along axons; loss of UNC-79 disrupts NCA-1 axonal localization and reduces synaptic transmission at neuromuscular junctions","method":"In vivo calcium imaging, loss-of-function genetics, localization by fluorescence imaging","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence plus in vivo calcium imaging readout","pmids":["18336069"],"is_preprint":false},{"year":2008,"finding":"UNC-79 and UNC-80 mutants are defective in NCA ion channel stabilization and are required for the transition between crawling and swimming locomotor patterns in C. elegans","method":"Genetic screen, behavioral analysis, in vivo calcium imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — clean loss-of-function with defined behavioral phenotype, but mechanism limited to channel stabilization inference","pmids":["19074276"],"is_preprint":false},{"year":2010,"finding":"UNC79 forms a complex with UNC80 and NALCN; UNC80 bridges NALCN to UNC79 within the same channel complex, and UNC79 knockout mice lose extracellular Ca2+-sensitive Na+-leak current (I_L-Na) in hippocampal neurons","method":"Co-immunoprecipitation, knockout mouse electrophysiology, cultured neuron recordings","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal complex identification with functional electrophysiological readout in knockout neurons, multiple orthogonal methods","pmids":["21040849"],"is_preprint":false},{"year":2010,"finding":"Mouse UNC79 (Lightweight/Lwt mutation) knockout homozygotes are perinatal lethal, and heterozygotes are hypersensitive to acute ethanol and isoflurane anesthesia, conserving the C. elegans unc-79 anesthetic sensitivity phenotype","method":"ENU forward mutagenesis screen, positional cloning, behavioral pharmacology in mice and C. elegans","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — positional cloning plus behavioral phenotype conserved across species with defined loss-of-function allele","pmids":["20714347"],"is_preprint":false},{"year":2013,"finding":"Drosophila UNC79 and UNC80 are required for robust circadian locomotor rhythmicity acting within pacemaker neurons; loss of unc79, unc80, or na leads to decreased expression of all three proteins post-transcriptionally; UNC79 and UNC80 co-immunoprecipitate with NA channel in Drosophila brain, confirming a physical complex","method":"Genetic loss-of-function (novel alleles), tissue-specific RNAi, rescue experiments, immunoprecipitation, Western blotting","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP confirming complex, multiple genetic approaches, interdependent post-transcriptional regulation demonstrated","pmids":["24223770"],"is_preprint":false},{"year":2020,"finding":"Robust NALCN channel function in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A; the resulting complex is constitutively active, conducts monovalent cations, is blocked by extracellular divalent cations, and shows voltage-dependent gating","method":"Heterologous expression reconstitution, electrophysiology (patch clamp), pharmacological analysis","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in heterologous system with functional electrophysiological characterization","pmids":["32494638"],"is_preprint":false},{"year":2020,"finding":"UNC80 contains a C-terminal domain that interacts with UNC79 and is required for dendritic localization of the NALCN complex; UNC80 knockout mice are neonatal lethal; UNC80 lacking this domain supports whole-cell NALCN currents but fails to achieve dendritic localization","method":"UNC80 knockout mice, domain deletion analysis, co-immunoprecipitation, live-cell imaging, electrophysiology","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — inter-subunit interaction mapped by deletion analysis, co-IP, localization with functional consequence, knockout phenotype","pmids":["32620897"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of the mammalian NALCN-FAM155A-UNC79-UNC80 quaternary complex reveals that UNC79-UNC80 form a large pillar-shaped heterodimer tethered to the intracellular side of NALCN via tripartite interactions with cytoplasmic loops; two interactions are essential for cell surface localization of NALCN; one interaction relieves NALCN self-inhibition by displacing the auto-inhibitory CTD Interacting Helix (CIH)","method":"Cryo-EM structure determination, functional mutagenesis, cell surface localization assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with mutagenesis and functional validation, defines molecular mechanism","pmids":["35550517"],"is_preprint":false},{"year":2021,"finding":"Drosophila UNC79 functions in mushroom body neurons (not pacemaker neurons) to regulate sleep duration and starvation resistance, revealing spatially separable functions from its role in circadian rhythmicity","method":"Genetic knockdown (RNAi), tissue-specific rescue, behavioral assays (sleep, starvation resistance)","journal":"G3 (Bethesda, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific genetic dissection with defined behavioral readouts, single study","pmids":["34849820"],"is_preprint":false},{"year":2018,"finding":"In C. elegans developmentally timed sleep, loss of UNC-79 (NCA channel auxiliary subunit) robustly increased arousal thresholds during sleep bouts; loss of EGL-4 or innexin proteins suppressed UNC-79 loss-of-function sleep and arousal defects, placing UNC-79/NCA channels upstream of gap junctions in the sleep pathway","method":"Genetic epistasis, behavioral assays (arousal threshold, sleep duration)","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis establishing pathway position, single study","pmids":["30323068"],"is_preprint":false},{"year":2006,"finding":"Targeted disruption of KIAA1409 (mouse UNC79 homolog) causes inability to drink in mice, demonstrating an essential in vivo function of the mammalian UNC79 protein","method":"Gene-targeted knockout mice, phenotypic analysis","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 — clean knockout with defined behavioral phenotype, single study","pmids":["16807365"],"is_preprint":false},{"year":2023,"finding":"Heterozygous loss-of-function UNC79 variants in humans cause a neurodevelopmental syndrome; Drosophila unc79 knockdown produces seizure-like phenotypes, and heterozygous loss-of-function mice show developmental body weight delay and impaired learning and memory","method":"Human genetics (variant identification), Drosophila RNAi seizure assay, mouse heterozygous knockout behavioral testing","journal":"Genetics in medicine : official journal of the American College of Medical Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — convergent evidence from human variants, Drosophila functional knockdown, and mouse knockout behavioral phenotype","pmids":["37183800"],"is_preprint":false}],"current_model":"UNC79 is a large cytoplasmic auxiliary subunit of the NALCN channelosome that, together with UNC80, forms a pillar-shaped heterodimer docked to the intracellular face of the NALCN-FAM155A channel core; UNC79-UNC80 promote cell-surface localization and dendritic targeting of NALCN, relieve NALCN auto-inhibition by displacing the CIH domain, and stabilize NALCN protein levels post-transcriptionally, collectively enabling the sodium leak current that sets resting membrane potential and neuronal excitability, with loss of UNC79 causing hypersensitivity to anesthetics/ethanol, locomotor defects, disrupted circadian and sleep behavior, and neurodevelopmental disease in both model organisms and humans."},"narrative":{"teleology":[{"year":2006,"claim":"Before any mechanistic insight, targeted disruption of the mouse UNC79 homolog (KIAA1409) established that the gene has an essential in vivo function in mammals, with knockouts unable to drink.","evidence":"Gene-targeted knockout mice with behavioral phenotyping","pmids":["16807365"],"confidence":"Medium","gaps":["No molecular target or pathway identified","Mechanism of drinking deficit unknown","Single study without replication"]},{"year":2007,"claim":"Genetic epistasis in C. elegans and Drosophila placed UNC-79 in the same pathway as the NALCN ortholog NA/NCA and showed that UNC-79 controls channel protein levels post-transcriptionally, establishing UNC79 as a channel-associated regulatory factor rather than an independent effector.","evidence":"Double-mutant epistasis and biochemical protein-level measurements across two invertebrate species","pmids":["17350263"],"confidence":"High","gaps":["Physical interaction with the channel not yet demonstrated","Mechanism of post-transcriptional regulation unknown"]},{"year":2008,"claim":"Loss-of-function studies revealed that UNC-79 is required for proper axonal localization of the NCA-1 channel and for normal synaptic transmission and locomotor behavior, demonstrating a trafficking/localization function beyond mere stabilization.","evidence":"In vivo fluorescence imaging, calcium imaging, and behavioral analysis in C. elegans","pmids":["18336069","19074276"],"confidence":"High","gaps":["Whether UNC-79 directly contacts the channel or acts through intermediaries unknown","Vertebrate localization role not yet tested"]},{"year":2010,"claim":"Biochemical and electrophysiological work in mouse neurons demonstrated that UNC79 physically associates with NALCN via UNC80 as a bridge, and that UNC79 knockout abolishes the Ca²⁺-sensitive sodium leak current (I_L-Na), directly linking complex assembly to channel function; independently, a forward genetic screen showed UNC79 haploinsufficiency confers hypersensitivity to ethanol and volatile anesthetics conserved from worms to mice.","evidence":"Co-immunoprecipitation, knockout mouse electrophysiology, ENU mutagenesis screen, positional cloning, behavioral pharmacology","pmids":["21040849","20714347"],"confidence":"High","gaps":["Stoichiometry and architecture of the complex unknown","Mechanism by which reduced leak current increases anesthetic sensitivity unclear"]},{"year":2013,"claim":"In Drosophila, UNC79 was shown to act within pacemaker neurons for circadian locomotor rhythmicity, and reciprocal co-IP confirmed a physical UNC79–UNC80–NA complex with interdependent post-transcriptional stabilization of all three subunits.","evidence":"Novel loss-of-function alleles, tissue-specific RNAi, rescue experiments, immunoprecipitation and Western blot in Drosophila brain","pmids":["24223770"],"confidence":"High","gaps":["Molecular basis of interdependent stabilization unknown","Whether circadian phenotype reflects altered resting potential or other signaling unclear"]},{"year":2018,"claim":"Epistasis analysis during C. elegans developmental sleep placed UNC-79/NCA channels upstream of gap junctions (innexins) and EGL-4 in sleep regulation, defining UNC79's position in a sleep signaling hierarchy.","evidence":"Genetic epistasis with arousal-threshold behavioral assays in C. elegans","pmids":["30323068"],"confidence":"Medium","gaps":["Mechanism linking leak current to gap-junction-dependent sleep signaling unresolved","Single study in one organism"]},{"year":2020,"claim":"Reconstitution of the full NALCN channelosome (NALCN–FAM155A–UNC79–UNC80) in heterologous cells produced constitutively active, divalent-cation-blocked, voltage-dependent monovalent cation currents, proving that all four subunits are necessary and sufficient for robust channel function; separately, the UNC80 C-terminal domain was mapped as the UNC79 interaction site required for dendritic targeting but dispensable for whole-cell current.","evidence":"Heterologous expression with patch-clamp electrophysiology; UNC80 domain deletion, co-IP, live-cell imaging in knockout mice","pmids":["32494638","32620897"],"confidence":"High","gaps":["Structural basis of UNC79–UNC80 heterodimer unknown","Mechanism of dendritic vs. somatic sorting not defined"]},{"year":2021,"claim":"Tissue-specific knockdown in Drosophila revealed that UNC79 functions in mushroom body neurons to regulate sleep and starvation resistance independently of its circadian role in pacemaker neurons, demonstrating spatially separable behavioral functions.","evidence":"RNAi, tissue-specific rescue, sleep and starvation-resistance assays in Drosophila","pmids":["34849820"],"confidence":"Medium","gaps":["Molecular mechanism in mushroom body neurons not defined","Single study; not replicated in vertebrates"]},{"year":2022,"claim":"Cryo-EM structure of the mammalian quaternary complex resolved UNC79–UNC80 as a pillar-shaped heterodimer attached to NALCN intracellular loops via three contacts, two promoting surface localization and one relieving auto-inhibition by displacing the CIH domain, providing the definitive structural mechanism for UNC79's role in channel activation and trafficking.","evidence":"Cryo-EM structure determination with functional mutagenesis and surface-localization assays","pmids":["35550517"],"confidence":"High","gaps":["Dynamic conformational changes during channel gating not captured","How the CIH-displacing interaction is regulated in vivo unknown","No structure of full-length UNC79–UNC80 at high resolution"]},{"year":2023,"claim":"Human genetic studies identified heterozygous UNC79 loss-of-function variants as causative for a neurodevelopmental syndrome, with cross-species validation in Drosophila (seizure-like phenotype) and heterozygous knockout mice (impaired learning and memory), establishing UNC79 haploinsufficiency as a human disease mechanism.","evidence":"Human variant identification, Drosophila RNAi seizure assay, mouse heterozygous knockout behavioral testing","pmids":["37183800"],"confidence":"Medium","gaps":["Genotype–phenotype spectrum in humans not fully delineated","Whether residual NALCN current exists in heterozygous patients unknown","Therapeutic targets not identified"]},{"year":null,"claim":"Key unresolved questions include how UNC79–UNC80 heterodimer assembly and CIH displacement are dynamically regulated, what upstream signals modulate the channelosome, and whether UNC79 has functions independent of NALCN.","evidence":"","pmids":[],"confidence":"Low","gaps":["No regulatory signal or post-translational modification controlling UNC79 identified","No evidence for or against NALCN-independent functions of UNC79","High-resolution structure of full-length UNC79 lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,3,6,8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,4,6,10,12]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[3,6,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[12]}],"complexes":["NALCN channelosome (NALCN-FAM155A-UNC79-UNC80)"],"partners":["UNC80","NALCN","FAM155A"],"other_free_text":[]},"mechanistic_narrative":"UNC79 is an essential auxiliary subunit of the NALCN sodium-leak channel complex that governs resting membrane potential, neuronal excitability, and diverse behaviors including locomotion, sleep, circadian rhythmicity, and anesthetic sensitivity. Together with UNC80, UNC79 forms a large pillar-shaped intracellular heterodimer that docks onto NALCN cytoplasmic loops via tripartite interactions: two of these contacts promote NALCN cell-surface and dendritic localization, while a third relieves NALCN auto-inhibition by displacing the CIH domain, collectively enabling the extracellular Ca²⁺-sensitive sodium leak current (I_L-Na) [PMID:35550517, PMID:21040849, PMID:32494638]. UNC79 stabilizes NALCN protein levels post-transcriptionally in a reciprocal, interdependent manner across species, such that loss of any one complex member reduces the others [PMID:17350263, PMID:24223770]. Heterozygous loss-of-function UNC79 variants in humans cause a neurodevelopmental syndrome with seizures and cognitive impairment, consistent with perinatal lethality or severe behavioral deficits in homozygous and heterozygous knockout mice [PMID:37183800, PMID:20714347]."},"prefetch_data":{"uniprot":{"accession":"Q9P2D8","full_name":"Protein unc-79 homolog","aliases":[],"length_aa":2635,"mass_kda":295.3,"function":"Auxiliary subunit of the NALCN sodium channel complex, a voltage-gated ion channel responsible for the resting Na(+) permeability that controls neuronal excitability. Activated by neuropeptides substance P, neurotensin, and extracellular calcium that regulates neuronal excitability by controlling the sizes of NALCN-dependent sodium-leak current","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9P2D8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/UNC79","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/UNC79","total_profiled":1310},"omim":[{"mim_id":"616884","title":"UNC79 HOMOLOG, NALCN CHANNEL COMPLEX SUBUNIT; UNC79","url":"https://www.omim.org/entry/616884"},{"mim_id":"616801","title":"HYPOTONIA, INFANTILE, WITH PSYCHOMOTOR RETARDATION AND CHARACTERISTIC FACIES 2; IHPRF2","url":"https://www.omim.org/entry/616801"},{"mim_id":"612636","title":"UNC80 HOMOLOG, NALCN CHANNEL COMPLEX SUBUNIT; UNC80","url":"https://www.omim.org/entry/612636"},{"mim_id":"611549","title":"SODIUM LEAK CHANNEL, NONSELECTIVE; NALCN","url":"https://www.omim.org/entry/611549"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":12.8},{"tissue":"pituitary gland","ntpm":11.1},{"tissue":"retina","ntpm":5.0}],"url":"https://www.proteinatlas.org/search/UNC79"},"hgnc":{"alias_symbol":[],"prev_symbol":["KIAA1409"]},"alphafold":{"accession":"Q9P2D8","domains":[{"cath_id":"-","chopping":"440-472_497-662","consensus_level":"medium","plddt":81.2803,"start":440,"end":662},{"cath_id":"-","chopping":"1040-1163_1220-1241","consensus_level":"medium","plddt":77.9314,"start":1040,"end":1241}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2D8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2D8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2D8-F1-predicted_aligned_error_v6.png","plddt_mean":63.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=UNC79","jax_strain_url":"https://www.jax.org/strain/search?query=UNC79"},"sequence":{"accession":"Q9P2D8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P2D8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P2D8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2D8"}},"corpus_meta":[{"pmid":"19074276","id":"PMC_19074276","title":"Genetic 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loss of UNC-79 disrupts NCA-1 axonal localization and reduces synaptic transmission at neuromuscular junctions\",\n      \"method\": \"In vivo calcium imaging, loss-of-function genetics, localization by fluorescence imaging\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence plus in vivo calcium imaging readout\",\n      \"pmids\": [\"18336069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"UNC-79 and UNC-80 mutants are defective in NCA ion channel stabilization and are required for the transition between crawling and swimming locomotor patterns in C. elegans\",\n      \"method\": \"Genetic screen, behavioral analysis, in vivo calcium imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined behavioral phenotype, but mechanism limited to channel stabilization inference\",\n      \"pmids\": [\"19074276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"UNC79 forms a complex with UNC80 and NALCN; UNC80 bridges NALCN to UNC79 within the same channel complex, and UNC79 knockout mice lose extracellular Ca2+-sensitive Na+-leak current (I_L-Na) in hippocampal neurons\",\n      \"method\": \"Co-immunoprecipitation, knockout mouse electrophysiology, cultured neuron recordings\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal complex identification with functional electrophysiological readout in knockout neurons, multiple orthogonal methods\",\n      \"pmids\": [\"21040849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mouse UNC79 (Lightweight/Lwt mutation) knockout homozygotes are perinatal lethal, and heterozygotes are hypersensitive to acute ethanol and isoflurane anesthesia, conserving the C. elegans unc-79 anesthetic sensitivity phenotype\",\n      \"method\": \"ENU forward mutagenesis screen, positional cloning, behavioral pharmacology in mice and C. elegans\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — positional cloning plus behavioral phenotype conserved across species with defined loss-of-function allele\",\n      \"pmids\": [\"20714347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Drosophila UNC79 and UNC80 are required for robust circadian locomotor rhythmicity acting within pacemaker neurons; loss of unc79, unc80, or na leads to decreased expression of all three proteins post-transcriptionally; UNC79 and UNC80 co-immunoprecipitate with NA channel in Drosophila brain, confirming a physical complex\",\n      \"method\": \"Genetic loss-of-function (novel alleles), tissue-specific RNAi, rescue experiments, immunoprecipitation, Western blotting\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP confirming complex, multiple genetic approaches, interdependent post-transcriptional regulation demonstrated\",\n      \"pmids\": [\"24223770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Robust NALCN channel function in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A; the resulting complex is constitutively active, conducts monovalent cations, is blocked by extracellular divalent cations, and shows voltage-dependent gating\",\n      \"method\": \"Heterologous expression reconstitution, electrophysiology (patch clamp), pharmacological analysis\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in heterologous system with functional electrophysiological characterization\",\n      \"pmids\": [\"32494638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"UNC80 contains a C-terminal domain that interacts with UNC79 and is required for dendritic localization of the NALCN complex; UNC80 knockout mice are neonatal lethal; UNC80 lacking this domain supports whole-cell NALCN currents but fails to achieve dendritic localization\",\n      \"method\": \"UNC80 knockout mice, domain deletion analysis, co-immunoprecipitation, live-cell imaging, electrophysiology\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — inter-subunit interaction mapped by deletion analysis, co-IP, localization with functional consequence, knockout phenotype\",\n      \"pmids\": [\"32620897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of the mammalian NALCN-FAM155A-UNC79-UNC80 quaternary complex reveals that UNC79-UNC80 form a large pillar-shaped heterodimer tethered to the intracellular side of NALCN via tripartite interactions with cytoplasmic loops; two interactions are essential for cell surface localization of NALCN; one interaction relieves NALCN self-inhibition by displacing the auto-inhibitory CTD Interacting Helix (CIH)\",\n      \"method\": \"Cryo-EM structure determination, functional mutagenesis, cell surface localization assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with mutagenesis and functional validation, defines molecular mechanism\",\n      \"pmids\": [\"35550517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Drosophila UNC79 functions in mushroom body neurons (not pacemaker neurons) to regulate sleep duration and starvation resistance, revealing spatially separable functions from its role in circadian rhythmicity\",\n      \"method\": \"Genetic knockdown (RNAi), tissue-specific rescue, behavioral assays (sleep, starvation resistance)\",\n      \"journal\": \"G3 (Bethesda, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific genetic dissection with defined behavioral readouts, single study\",\n      \"pmids\": [\"34849820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In C. elegans developmentally timed sleep, loss of UNC-79 (NCA channel auxiliary subunit) robustly increased arousal thresholds during sleep bouts; loss of EGL-4 or innexin proteins suppressed UNC-79 loss-of-function sleep and arousal defects, placing UNC-79/NCA channels upstream of gap junctions in the sleep pathway\",\n      \"method\": \"Genetic epistasis, behavioral assays (arousal threshold, sleep duration)\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis establishing pathway position, single study\",\n      \"pmids\": [\"30323068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Targeted disruption of KIAA1409 (mouse UNC79 homolog) causes inability to drink in mice, demonstrating an essential in vivo function of the mammalian UNC79 protein\",\n      \"method\": \"Gene-targeted knockout mice, phenotypic analysis\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean knockout with defined behavioral phenotype, single study\",\n      \"pmids\": [\"16807365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Heterozygous loss-of-function UNC79 variants in humans cause a neurodevelopmental syndrome; Drosophila unc79 knockdown produces seizure-like phenotypes, and heterozygous loss-of-function mice show developmental body weight delay and impaired learning and memory\",\n      \"method\": \"Human genetics (variant identification), Drosophila RNAi seizure assay, mouse heterozygous knockout behavioral testing\",\n      \"journal\": \"Genetics in medicine : official journal of the American College of Medical Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — convergent evidence from human variants, Drosophila functional knockdown, and mouse knockout behavioral phenotype\",\n      \"pmids\": [\"37183800\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UNC79 is a large cytoplasmic auxiliary subunit of the NALCN channelosome that, together with UNC80, forms a pillar-shaped heterodimer docked to the intracellular face of the NALCN-FAM155A channel core; UNC79-UNC80 promote cell-surface localization and dendritic targeting of NALCN, relieve NALCN auto-inhibition by displacing the CIH domain, and stabilize NALCN protein levels post-transcriptionally, collectively enabling the sodium leak current that sets resting membrane potential and neuronal excitability, with loss of UNC79 causing hypersensitivity to anesthetics/ethanol, locomotor defects, disrupted circadian and sleep behavior, and neurodevelopmental disease in both model organisms and humans.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"UNC79 is an essential auxiliary subunit of the NALCN sodium-leak channel complex that governs resting membrane potential, neuronal excitability, and diverse behaviors including locomotion, sleep, circadian rhythmicity, and anesthetic sensitivity. Together with UNC80, UNC79 forms a large pillar-shaped intracellular heterodimer that docks onto NALCN cytoplasmic loops via tripartite interactions: two of these contacts promote NALCN cell-surface and dendritic localization, while a third relieves NALCN auto-inhibition by displacing the CIH domain, collectively enabling the extracellular Ca²⁺-sensitive sodium leak current (I_L-Na) [PMID:35550517, PMID:21040849, PMID:32494638]. UNC79 stabilizes NALCN protein levels post-transcriptionally in a reciprocal, interdependent manner across species, such that loss of any one complex member reduces the others [PMID:17350263, PMID:24223770]. Heterozygous loss-of-function UNC79 variants in humans cause a neurodevelopmental syndrome with seizures and cognitive impairment, consistent with perinatal lethality or severe behavioral deficits in homozygous and heterozygous knockout mice [PMID:37183800, PMID:20714347].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Before any mechanistic insight, targeted disruption of the mouse UNC79 homolog (KIAA1409) established that the gene has an essential in vivo function in mammals, with knockouts unable to drink.\",\n      \"evidence\": \"Gene-targeted knockout mice with behavioral phenotyping\",\n      \"pmids\": [\"16807365\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular target or pathway identified\", \"Mechanism of drinking deficit unknown\", \"Single study without replication\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetic epistasis in C. elegans and Drosophila placed UNC-79 in the same pathway as the NALCN ortholog NA/NCA and showed that UNC-79 controls channel protein levels post-transcriptionally, establishing UNC79 as a channel-associated regulatory factor rather than an independent effector.\",\n      \"evidence\": \"Double-mutant epistasis and biochemical protein-level measurements across two invertebrate species\",\n      \"pmids\": [\"17350263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical interaction with the channel not yet demonstrated\", \"Mechanism of post-transcriptional regulation unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Loss-of-function studies revealed that UNC-79 is required for proper axonal localization of the NCA-1 channel and for normal synaptic transmission and locomotor behavior, demonstrating a trafficking/localization function beyond mere stabilization.\",\n      \"evidence\": \"In vivo fluorescence imaging, calcium imaging, and behavioral analysis in C. elegans\",\n      \"pmids\": [\"18336069\", \"19074276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether UNC-79 directly contacts the channel or acts through intermediaries unknown\", \"Vertebrate localization role not yet tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biochemical and electrophysiological work in mouse neurons demonstrated that UNC79 physically associates with NALCN via UNC80 as a bridge, and that UNC79 knockout abolishes the Ca²⁺-sensitive sodium leak current (I_L-Na), directly linking complex assembly to channel function; independently, a forward genetic screen showed UNC79 haploinsufficiency confers hypersensitivity to ethanol and volatile anesthetics conserved from worms to mice.\",\n      \"evidence\": \"Co-immunoprecipitation, knockout mouse electrophysiology, ENU mutagenesis screen, positional cloning, behavioral pharmacology\",\n      \"pmids\": [\"21040849\", \"20714347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the complex unknown\", \"Mechanism by which reduced leak current increases anesthetic sensitivity unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"In Drosophila, UNC79 was shown to act within pacemaker neurons for circadian locomotor rhythmicity, and reciprocal co-IP confirmed a physical UNC79–UNC80–NA complex with interdependent post-transcriptional stabilization of all three subunits.\",\n      \"evidence\": \"Novel loss-of-function alleles, tissue-specific RNAi, rescue experiments, immunoprecipitation and Western blot in Drosophila brain\",\n      \"pmids\": [\"24223770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of interdependent stabilization unknown\", \"Whether circadian phenotype reflects altered resting potential or other signaling unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Epistasis analysis during C. elegans developmental sleep placed UNC-79/NCA channels upstream of gap junctions (innexins) and EGL-4 in sleep regulation, defining UNC79's position in a sleep signaling hierarchy.\",\n      \"evidence\": \"Genetic epistasis with arousal-threshold behavioral assays in C. elegans\",\n      \"pmids\": [\"30323068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking leak current to gap-junction-dependent sleep signaling unresolved\", \"Single study in one organism\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Reconstitution of the full NALCN channelosome (NALCN–FAM155A–UNC79–UNC80) in heterologous cells produced constitutively active, divalent-cation-blocked, voltage-dependent monovalent cation currents, proving that all four subunits are necessary and sufficient for robust channel function; separately, the UNC80 C-terminal domain was mapped as the UNC79 interaction site required for dendritic targeting but dispensable for whole-cell current.\",\n      \"evidence\": \"Heterologous expression with patch-clamp electrophysiology; UNC80 domain deletion, co-IP, live-cell imaging in knockout mice\",\n      \"pmids\": [\"32494638\", \"32620897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of UNC79–UNC80 heterodimer unknown\", \"Mechanism of dendritic vs. somatic sorting not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Tissue-specific knockdown in Drosophila revealed that UNC79 functions in mushroom body neurons to regulate sleep and starvation resistance independently of its circadian role in pacemaker neurons, demonstrating spatially separable behavioral functions.\",\n      \"evidence\": \"RNAi, tissue-specific rescue, sleep and starvation-resistance assays in Drosophila\",\n      \"pmids\": [\"34849820\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism in mushroom body neurons not defined\", \"Single study; not replicated in vertebrates\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM structure of the mammalian quaternary complex resolved UNC79–UNC80 as a pillar-shaped heterodimer attached to NALCN intracellular loops via three contacts, two promoting surface localization and one relieving auto-inhibition by displacing the CIH domain, providing the definitive structural mechanism for UNC79's role in channel activation and trafficking.\",\n      \"evidence\": \"Cryo-EM structure determination with functional mutagenesis and surface-localization assays\",\n      \"pmids\": [\"35550517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamic conformational changes during channel gating not captured\", \"How the CIH-displacing interaction is regulated in vivo unknown\", \"No structure of full-length UNC79–UNC80 at high resolution\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Human genetic studies identified heterozygous UNC79 loss-of-function variants as causative for a neurodevelopmental syndrome, with cross-species validation in Drosophila (seizure-like phenotype) and heterozygous knockout mice (impaired learning and memory), establishing UNC79 haploinsufficiency as a human disease mechanism.\",\n      \"evidence\": \"Human variant identification, Drosophila RNAi seizure assay, mouse heterozygous knockout behavioral testing\",\n      \"pmids\": [\"37183800\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genotype–phenotype spectrum in humans not fully delineated\", \"Whether residual NALCN current exists in heterozygous patients unknown\", \"Therapeutic targets not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how UNC79–UNC80 heterodimer assembly and CIH displacement are dynamically regulated, what upstream signals modulate the channelosome, and whether UNC79 has functions independent of NALCN.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No regulatory signal or post-translational modification controlling UNC79 identified\", \"No evidence for or against NALCN-independent functions of UNC79\", \"High-resolution structure of full-length UNC79 lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 3, 6, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 4, 6, 10, 12]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [3, 6, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\n      \"NALCN channelosome (NALCN-FAM155A-UNC79-UNC80)\"\n    ],\n    \"partners\": [\n      \"UNC80\",\n      \"NALCN\",\n      \"FAM155A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}