{"gene":"UNC79","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2022,"finding":"Cryo-EM structure of the mammalian NALCN-FAM155A-UNC79-UNC80 quaternary complex shows that UNC79 and UNC80 form a large pillar-shaped heterodimer tethered to the intracellular side of NALCN through tripartite interactions with cytoplasmic loops of NALCN. Two of these interactions are essential for proper cell surface localization of NALCN, while a third relieves NALCN self-inhibition by pulling an auto-inhibitory CTD Interacting Helix (CIH) out of its binding site.","method":"Cryo-EM structure determination with functional validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution cryo-EM structure with functional validation of interaction interfaces; single rigorous study with multiple orthogonal methods","pmids":["35550517"],"is_preprint":false},{"year":2010,"finding":"UNC79 is a component of a NALCN channel complex in which UNC80 bridges NALCN to UNC79. This complex is required for a G protein-dependent Na+-leak current (I_L-Na) that is activated by lowering extracellular Ca2+. Neurons from unc79 knockout mice lack sensitivity of I_L-Na to changes in extracellular Ca2+, and the excitatory effect of reduced extracellular Ca2+ is absent.","method":"Knockout mouse electrophysiology (cultured hippocampal neurons), genetic analysis, Ca2+ sensitivity assay","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with defined electrophysiological phenotype, replicated in multiple genetic contexts, multiple orthogonal methods","pmids":["21040849"],"is_preprint":false},{"year":2020,"finding":"UNC79 and UNC80 are bona fide subunits of the NALCN channel complex in mammals. The C-terminus of UNC80 contains a domain that interacts with UNC79 and is required for dendritic localization of the complex; UNC80 lacking this domain (as found in intellectual disability patients) still supports whole-cell NALCN currents but fails to localize to dendrites, implicating UNC79 interaction in dendritic membrane potential regulation.","method":"UNC80 knockout mice (neonatal lethal phenotype confirmed), domain-deletion constructs, Co-immunoprecipitation, subcellular localization imaging, whole-cell patch-clamp","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, KO mouse, domain mapping, localization imaging, and functional electrophysiology in a single study","pmids":["32620897"],"is_preprint":false},{"year":2007,"finding":"UNC-79 encodes a large cytosolic protein that controls NA (NALCN ortholog) protein levels by a post-transcriptional mechanism in both Drosophila and C. elegans. Biochemical studies show that loss of UNC-79 reduces NA protein without affecting transcript levels, placing UNC-79 upstream of the channel in a conserved pathway also involving the na/NALCN gene.","method":"Genetic epistasis (double mutants), biochemical assay of protein vs. mRNA levels, cross-species ortholog analysis","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — post-transcriptional regulation confirmed by protein/mRNA quantification, cross-species epistasis in two organisms","pmids":["17350263"],"is_preprint":false},{"year":2013,"finding":"In Drosophila, UNC79 and UNC80 are required for robust circadian locomotor rhythmicity in pacemaker neurons. Loss of unc79, unc80, or na leads to decreased expression of all three proteins with minimal effect on transcript levels, demonstrating an interdependent post-transcriptional regulatory relationship. Immunoprecipitation confirms that UNC79 and UNC80 form a complex with NA (NALCN ortholog) in the Drosophila brain. Functional requirements for UNC79 and UNC80 extend beyond merely promoting channel subunit expression, as increased NA protein cannot bypass the need for these subunits.","method":"Genetic loss-of-function alleles, tissue-specific RNAi and rescue, immunoprecipitation, protein and transcript quantification","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, protein/mRNA quantification, genetic rescue experiments, multiple orthogonal methods in a single focused study","pmids":["24223770"],"is_preprint":false},{"year":2008,"finding":"In C. elegans, NCA-1 localization along axons and its function in propagating neuronal activity from cell bodies to synapses depend on UNC-79 and UNC-80. Loss of UNC-79 disrupts NCA-1 localization (enriched at nonsynaptic regions) and reduces synaptic calcium transients at neuromuscular junctions.","method":"In vivo calcium imaging, fluorescent protein localization, genetic loss-of-function analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct in vivo calcium imaging with genetic controls, localization experiments with functional consequence, replicated in multiple alleles","pmids":["18336069"],"is_preprint":false},{"year":2010,"finding":"Positional cloning of the mouse Lightweight (Lwt) mutation identifies it as a loss-of-function allele in the mouse UNC79 homolog. Lwt/Lwt homozygotes are perinatal lethal; heterozygotes are hypersensitive to acute ethanol and to the anesthetic isoflurane. Parallel C. elegans experiments confirm conserved hypersensitivity to ethanol in unc-79 mutants and in nca-1;nca-2 double mutants, placing UNC79 in the same pathway as NCA/NALCN channels.","method":"ENU forward mutagenesis, positional cloning, behavioral pharmacology (ethanol/isoflurane), genetic epistasis in C. elegans","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning, KO lethality, pharmacological phenotyping in mouse and C. elegans, cross-species epistasis","pmids":["20714347"],"is_preprint":false},{"year":2020,"finding":"Robust functional expression of the NALCN channel complex in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A. The resulting complex is constitutively active, conducts monovalent cations, and is blocked by physiological concentrations of extracellular divalent cations; it also shows voltage-dependent modulation.","method":"Heterologous expression (co-transfection), electrophysiology (whole-cell and single-channel recordings), pharmacological profiling","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted channel complex in heterologous system with electrophysiological and pharmacological characterization; multiple orthogonal assays","pmids":["32494638"],"is_preprint":false},{"year":2006,"finding":"Targeted disruption of mouse KIAA1409 (UNC79 homolog) results in mice that lack the ability to drink (adipsia phenotype), establishing that UNC79 is essential for a specific neural behavior in mammals. Homozygous knockouts display this overt phenotypic defect.","method":"Gene-targeted knockout mice, behavioral phenotyping","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — defined KO phenotype (adipsia) in mice, single lab, limited molecular mechanistic follow-up in the abstract","pmids":["16807365"],"is_preprint":false},{"year":2008,"finding":"In C. elegans, unc-79 and unc-80 mutants are defective in NCA ion channel stabilization and in transitioning between crawling and swimming locomotor rhythms, placing UNC-79 genetically upstream or in the same pathway as NCA channels for behavioral pattern generation.","method":"Genetic mutant analysis, in vivo calcium imaging, behavioral assays","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and calcium imaging, replicated across two locomotor paradigms in a single study","pmids":["19074276"],"is_preprint":false},{"year":1987,"finding":"Mutations in unc-79 confer hypersensitivity to halothane in C. elegans. The double mutant unc-79; unc-80 is slightly more sensitive than either single mutant, suggesting additive or partially redundant functions, and mutations in unc-9 suppress both unc-79 and unc-80 halothane hypersensitivity, placing these genes in a genetic pathway.","method":"Genetic mutant analysis, anesthetic dose-response (ED50 determination), epistasis with suppressor mutations","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative pharmacogenetic epistasis, replicated across multiple alleles","pmids":["3576211"],"is_preprint":false},{"year":2021,"finding":"In Drosophila, UNC79 functions within mushroom body neurons (distinct from pacemaker neurons) to regulate sleep duration and starvation resistance, revealing a spatially separable role from its function in circadian rhythmicity in pacemaker neurons.","method":"Genetic knockdown (RNAi), tissue-specific rescue, sleep/behavioral assays, starvation resistance assays","journal":"G3 (Bethesda, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific RNAi and rescue in Drosophila, behavioral phenotyping with cell-type resolution","pmids":["34849820"],"is_preprint":false},{"year":2023,"finding":"Heterozygous loss-of-function variants in UNC79 in humans are associated with a neurodevelopmental syndrome. Drosophila with UNC79 knocked down display induced seizure-like phenotypes, and heterozygous loss-of-function mice show developmental delay in body weight and impaired learning and memory, establishing UNC79 haploinsufficiency as causally linked to neurological pathology.","method":"Human genetics, Drosophila RNAi seizure assay, heterozygous mouse KO behavioral testing (learning/memory, body weight)","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cross-species functional validation (fly and mouse), but human genetic data is associative; mouse/fly experiments provide causal evidence","pmids":["37183800"],"is_preprint":false},{"year":2018,"finding":"Loss of UNC-79 in C. elegans robustly increases arousal thresholds during sleep bouts in L4-to-adult developmentally timed sleep, and this effect is suppressed by loss of EGL-4 or innexin proteins (UNC-7, UNC-9), placing UNC-79/NCA channels upstream of gap junctions in a sleep-regulation pathway.","method":"Genetic epistasis, behavioral sleep assays, arousal threshold measurement","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with defined suppressor relationships and quantitative behavioral phenotyping","pmids":["30323068"],"is_preprint":false}],"current_model":"UNC79 is a large cytosolic auxiliary subunit of the NALCN sodium leak channel complex (NALCN-FAM155A-UNC79-UNC80); cryo-EM and functional studies show that UNC79 forms a pillar-shaped heterodimer with UNC80 that docks to the intracellular face of NALCN, promotes NALCN cell-surface localization, relieves NALCN autoinhibition, and is required—together with UNC80—for constitutive channel activity, dendritic targeting, G protein-coupled extracellular Ca2+-sensing, and proper neuronal excitability underlying locomotion, circadian rhythmicity, sleep, and anesthetic/ethanol sensitivity across nematodes, flies, and mice."},"narrative":{"mechanistic_narrative":"UNC79 is a large cytosolic auxiliary subunit of the NALCN sodium leak channel complex that controls neuronal excitability underlying locomotion, circadian rhythm, sleep, and anesthetic sensitivity across nematodes, flies, and mammals [PMID:21040849, PMID:24223770, PMID:20714347]. Within the assembled NALCN-FAM155A-UNC79-UNC80 quaternary complex, UNC79 partners with UNC80 to form a pillar-shaped heterodimer that docks onto the intracellular face of NALCN through tripartite contacts with the channel's cytoplasmic loops; two of these interfaces drive proper cell-surface localization, while a third relieves channel autoinhibition by extracting the auto-inhibitory CTD Interacting Helix from its binding site [PMID:35550517]. UNC79 is bridged to NALCN through UNC80, and this UNC80 interaction is required for dendritic targeting of the complex [PMID:32620897]. Functionally, UNC79 (with UNC80 and FAM155A) is needed to reconstitute a constitutively active, divalent-blocked monovalent cation current in heterologous systems [PMID:32494638] and confers the G protein-dependent sodium leak current that is activated by lowering extracellular Ca2+ [PMID:21040849]. Beyond gating, UNC79 acts post-transcriptionally to stabilize NALCN/NA protein levels and localization, with channel subunits showing mutual interdependence for steady-state abundance without changes in transcript level [PMID:17350263, PMID:24223770, PMID:18336069]. Heterozygous loss-of-function variants in UNC79 cause a neurodevelopmental syndrome, recapitulated by seizure phenotypes in flies and learning/memory deficits in heterozygous mice [PMID:37183800].","teleology":[{"year":1987,"claim":"Established the first phenotypic handle on UNC79 by showing its mutation alters whole-animal anesthetic sensitivity, and placed it in a defined genetic pathway with UNC80 and the gap-junction gene unc-9.","evidence":"Anesthetic dose-response and suppressor epistasis in C. elegans","pmids":["3576211"],"confidence":"Medium","gaps":["No molecular identity or biochemical activity defined","Link to an ion channel not yet established"]},{"year":2006,"claim":"Demonstrated that the mammalian UNC79 homolog is essential for a specific neural behavior, indicating a non-redundant physiological role in vivo.","evidence":"Gene-targeted knockout mice with adipsia behavioral phenotyping","pmids":["16807365"],"confidence":"Medium","gaps":["Molecular mechanism of the behavioral defect not characterized","No connection to NALCN drawn in this study"]},{"year":2007,"claim":"Resolved how UNC79 regulates the channel by showing it controls NALCN/NA protein levels post-transcriptionally, placing it upstream of the channel in a conserved pathway.","evidence":"Genetic epistasis and protein-versus-mRNA quantification in Drosophila and C. elegans","pmids":["17350263"],"confidence":"High","gaps":["Biochemical mechanism of protein stabilization unknown","Direct physical association with the channel not yet shown"]},{"year":2008,"claim":"Showed that UNC79 is required for proper axonal localization of the NALCN ortholog and for propagating neuronal activity to synapses, linking the protein to channel trafficking and function.","evidence":"In vivo calcium imaging and fluorescent localization in C. elegans loss-of-function mutants","pmids":["18336069","19074276"],"confidence":"High","gaps":["Whether localization defect is direct or downstream of reduced channel abundance unclear","Molecular trafficking machinery not identified"]},{"year":2010,"claim":"Defined UNC79 as a bona fide complex member that confers extracellular Ca2+ sensitivity and G protein-dependent leak current, establishing its mechanistic contribution to channel gating.","evidence":"Knockout mouse hippocampal electrophysiology and Ca2+-sensitivity assays; positional cloning with ethanol/isoflurane pharmacology","pmids":["21040849","20714347"],"confidence":"High","gaps":["Structural basis of the Ca2+ sensitivity not resolved","Identity of coupling G protein not defined"]},{"year":2013,"claim":"Demonstrated an interdependent post-transcriptional regulatory loop among UNC79, UNC80, and NA, and showed UNC79 has functions beyond promoting subunit expression, refining its role as more than a chaperone.","evidence":"Immunoprecipitation, protein/transcript quantification, and genetic rescue in Drosophila pacemaker neurons","pmids":["24223770"],"confidence":"High","gaps":["Nature of the function not bypassed by increased NA protein undefined","Molecular basis of mutual stabilization unknown"]},{"year":2018,"claim":"Positioned the UNC79/NCA channel upstream of gap junctions in a sleep-regulation circuit, extending the pathway to a defined behavioral output.","evidence":"Genetic epistasis with egl-4 and innexin suppressors and arousal-threshold sleep assays in C. elegans","pmids":["30323068"],"confidence":"Medium","gaps":["Cellular site of action within sleep circuitry not pinpointed","Direct molecular link to innexins not shown"]},{"year":2020,"claim":"Reconstituted the minimal functional channel and mapped the UNC80 domain required for UNC79 binding and dendritic targeting, distinguishing trafficking from current-carrying functions.","evidence":"Heterologous co-expression electrophysiology; reciprocal Co-IP, domain deletion, and localization imaging","pmids":["32494638","32620897"],"confidence":"High","gaps":["Mechanism by which the UNC79-UNC80 interaction directs dendritic localization unresolved","Stoichiometry within native complex not defined here"]},{"year":2021,"claim":"Revealed spatially separable neuronal functions for UNC79, acting in mushroom body neurons for sleep and starvation resistance distinct from its pacemaker-neuron role in rhythmicity.","evidence":"Tissue-specific RNAi and rescue with behavioral assays in Drosophila","pmids":["34849820"],"confidence":"Medium","gaps":["Whether distinct functions reflect different channel partners unclear","Molecular outputs in mushroom body neurons not defined"]},{"year":2022,"claim":"Provided the structural mechanism: UNC79 and UNC80 form a pillar-shaped heterodimer that tethers to NALCN and relieves autoinhibition, unifying trafficking and gating roles at atomic resolution.","evidence":"Cryo-EM of the mammalian NALCN-FAM155A-UNC79-UNC80 complex with functional validation of interfaces","pmids":["35550517"],"confidence":"High","gaps":["Conformational dynamics during channel activation not captured","How extracellular Ca2+ sensing is transduced to the cytoplasmic UNC79-UNC80 module unresolved"]},{"year":2023,"claim":"Established UNC79 haploinsufficiency as causally linked to human neurodevelopmental pathology, connecting molecular function to disease.","evidence":"Human genetics with Drosophila seizure assays and heterozygous mouse learning/memory phenotyping","pmids":["37183800"],"confidence":"Medium","gaps":["Human genetic association is associative; causality rests on model organisms","How partial loss of UNC79 alters NALCN function in human neurons not defined"]},{"year":null,"claim":"How extracellular Ca2+ and G protein signals are mechanistically transduced through the cytoplasmic UNC79-UNC80 module to gate NALCN, and how UNC79 selects among distinct neuronal functions, remain open.","evidence":"Not yet addressed in the available corpus","pmids":[],"confidence":"Medium","gaps":["No structure of the Ca2+-sensing or G protein-coupled state","Direct biochemical mechanism of post-transcriptional protein stabilization unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,5]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,5,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1]}],"complexes":["NALCN-FAM155A-UNC79-UNC80 channel complex"],"partners":["UNC80","NALCN","FAM155A"],"other_free_text":[]}},"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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Two of these interactions are essential for proper cell surface localization of NALCN, while a third relieves NALCN self-inhibition by pulling an auto-inhibitory CTD Interacting Helix (CIH) out of its binding site.\",\n      \"method\": \"Cryo-EM structure determination with functional validation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution cryo-EM structure with functional validation of interaction interfaces; single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"35550517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"UNC79 is a component of a NALCN channel complex in which UNC80 bridges NALCN to UNC79. This complex is required for a G protein-dependent Na+-leak current (I_L-Na) that is activated by lowering extracellular Ca2+. Neurons from unc79 knockout mice lack sensitivity of I_L-Na to changes in extracellular Ca2+, and the excitatory effect of reduced extracellular Ca2+ is absent.\",\n      \"method\": \"Knockout mouse electrophysiology (cultured hippocampal neurons), genetic analysis, Ca2+ sensitivity assay\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with defined electrophysiological phenotype, replicated in multiple genetic contexts, multiple orthogonal methods\",\n      \"pmids\": [\"21040849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"UNC79 and UNC80 are bona fide subunits of the NALCN channel complex in mammals. The C-terminus of UNC80 contains a domain that interacts with UNC79 and is required for dendritic localization of the complex; UNC80 lacking this domain (as found in intellectual disability patients) still supports whole-cell NALCN currents but fails to localize to dendrites, implicating UNC79 interaction in dendritic membrane potential regulation.\",\n      \"method\": \"UNC80 knockout mice (neonatal lethal phenotype confirmed), domain-deletion constructs, Co-immunoprecipitation, subcellular localization imaging, whole-cell patch-clamp\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, KO mouse, domain mapping, localization imaging, and functional electrophysiology in a single study\",\n      \"pmids\": [\"32620897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"UNC-79 encodes a large cytosolic protein that controls NA (NALCN ortholog) protein levels by a post-transcriptional mechanism in both Drosophila and C. elegans. Biochemical studies show that loss of UNC-79 reduces NA protein without affecting transcript levels, placing UNC-79 upstream of the channel in a conserved pathway also involving the na/NALCN gene.\",\n      \"method\": \"Genetic epistasis (double mutants), biochemical assay of protein vs. mRNA levels, cross-species ortholog analysis\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — post-transcriptional regulation confirmed by protein/mRNA quantification, cross-species epistasis in two organisms\",\n      \"pmids\": [\"17350263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Drosophila, UNC79 and UNC80 are required for robust circadian locomotor rhythmicity in pacemaker neurons. Loss of unc79, unc80, or na leads to decreased expression of all three proteins with minimal effect on transcript levels, demonstrating an interdependent post-transcriptional regulatory relationship. Immunoprecipitation confirms that UNC79 and UNC80 form a complex with NA (NALCN ortholog) in the Drosophila brain. Functional requirements for UNC79 and UNC80 extend beyond merely promoting channel subunit expression, as increased NA protein cannot bypass the need for these subunits.\",\n      \"method\": \"Genetic loss-of-function alleles, tissue-specific RNAi and rescue, immunoprecipitation, protein and transcript quantification\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, protein/mRNA quantification, genetic rescue experiments, multiple orthogonal methods in a single focused study\",\n      \"pmids\": [\"24223770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In C. elegans, NCA-1 localization along axons and its function in propagating neuronal activity from cell bodies to synapses depend on UNC-79 and UNC-80. Loss of UNC-79 disrupts NCA-1 localization (enriched at nonsynaptic regions) and reduces synaptic calcium transients at neuromuscular junctions.\",\n      \"method\": \"In vivo calcium imaging, fluorescent protein localization, genetic loss-of-function analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct in vivo calcium imaging with genetic controls, localization experiments with functional consequence, replicated in multiple alleles\",\n      \"pmids\": [\"18336069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Positional cloning of the mouse Lightweight (Lwt) mutation identifies it as a loss-of-function allele in the mouse UNC79 homolog. Lwt/Lwt homozygotes are perinatal lethal; heterozygotes are hypersensitive to acute ethanol and to the anesthetic isoflurane. Parallel C. elegans experiments confirm conserved hypersensitivity to ethanol in unc-79 mutants and in nca-1;nca-2 double mutants, placing UNC79 in the same pathway as NCA/NALCN channels.\",\n      \"method\": \"ENU forward mutagenesis, positional cloning, behavioral pharmacology (ethanol/isoflurane), genetic epistasis in C. elegans\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning, KO lethality, pharmacological phenotyping in mouse and C. elegans, cross-species epistasis\",\n      \"pmids\": [\"20714347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Robust functional expression of the NALCN channel complex in heterologous systems requires co-expression of UNC79, UNC80, and FAM155A. The resulting complex is constitutively active, conducts monovalent cations, and is blocked by physiological concentrations of extracellular divalent cations; it also shows voltage-dependent modulation.\",\n      \"method\": \"Heterologous expression (co-transfection), electrophysiology (whole-cell and single-channel recordings), pharmacological profiling\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted channel complex in heterologous system with electrophysiological and pharmacological characterization; multiple orthogonal assays\",\n      \"pmids\": [\"32494638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Targeted disruption of mouse KIAA1409 (UNC79 homolog) results in mice that lack the ability to drink (adipsia phenotype), establishing that UNC79 is essential for a specific neural behavior in mammals. Homozygous knockouts display this overt phenotypic defect.\",\n      \"method\": \"Gene-targeted knockout mice, behavioral phenotyping\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — defined KO phenotype (adipsia) in mice, single lab, limited molecular mechanistic follow-up in the abstract\",\n      \"pmids\": [\"16807365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In C. elegans, unc-79 and unc-80 mutants are defective in NCA ion channel stabilization and in transitioning between crawling and swimming locomotor rhythms, placing UNC-79 genetically upstream or in the same pathway as NCA channels for behavioral pattern generation.\",\n      \"method\": \"Genetic mutant analysis, in vivo calcium imaging, behavioral assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and calcium imaging, replicated across two locomotor paradigms in a single study\",\n      \"pmids\": [\"19074276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"Mutations in unc-79 confer hypersensitivity to halothane in C. elegans. The double mutant unc-79; unc-80 is slightly more sensitive than either single mutant, suggesting additive or partially redundant functions, and mutations in unc-9 suppress both unc-79 and unc-80 halothane hypersensitivity, placing these genes in a genetic pathway.\",\n      \"method\": \"Genetic mutant analysis, anesthetic dose-response (ED50 determination), epistasis with suppressor mutations\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative pharmacogenetic epistasis, replicated across multiple alleles\",\n      \"pmids\": [\"3576211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Drosophila, UNC79 functions within mushroom body neurons (distinct from pacemaker neurons) to regulate sleep duration and starvation resistance, revealing a spatially separable role from its function in circadian rhythmicity in pacemaker neurons.\",\n      \"method\": \"Genetic knockdown (RNAi), tissue-specific rescue, sleep/behavioral assays, starvation resistance assays\",\n      \"journal\": \"G3 (Bethesda, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific RNAi and rescue in Drosophila, behavioral phenotyping with cell-type resolution\",\n      \"pmids\": [\"34849820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Heterozygous loss-of-function variants in UNC79 in humans are associated with a neurodevelopmental syndrome. Drosophila with UNC79 knocked down display induced seizure-like phenotypes, and heterozygous loss-of-function mice show developmental delay in body weight and impaired learning and memory, establishing UNC79 haploinsufficiency as causally linked to neurological pathology.\",\n      \"method\": \"Human genetics, Drosophila RNAi seizure assay, heterozygous mouse KO behavioral testing (learning/memory, body weight)\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cross-species functional validation (fly and mouse), but human genetic data is associative; mouse/fly experiments provide causal evidence\",\n      \"pmids\": [\"37183800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of UNC-79 in C. elegans robustly increases arousal thresholds during sleep bouts in L4-to-adult developmentally timed sleep, and this effect is suppressed by loss of EGL-4 or innexin proteins (UNC-7, UNC-9), placing UNC-79/NCA channels upstream of gap junctions in a sleep-regulation pathway.\",\n      \"method\": \"Genetic epistasis, behavioral sleep assays, arousal threshold measurement\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with defined suppressor relationships and quantitative behavioral phenotyping\",\n      \"pmids\": [\"30323068\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"UNC79 is a large cytosolic auxiliary subunit of the NALCN sodium leak channel complex (NALCN-FAM155A-UNC79-UNC80); cryo-EM and functional studies show that UNC79 forms a pillar-shaped heterodimer with UNC80 that docks to the intracellular face of NALCN, promotes NALCN cell-surface localization, relieves NALCN autoinhibition, and is required—together with UNC80—for constitutive channel activity, dendritic targeting, G protein-coupled extracellular Ca2+-sensing, and proper neuronal excitability underlying locomotion, circadian rhythmicity, sleep, and anesthetic/ethanol sensitivity across nematodes, flies, and mice.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"UNC79 is a large cytosolic auxiliary subunit of the NALCN sodium leak channel complex that controls neuronal excitability underlying locomotion, circadian rhythm, sleep, and anesthetic sensitivity across nematodes, flies, and mammals [#1, #4, #6]. Within the assembled NALCN-FAM155A-UNC79-UNC80 quaternary complex, UNC79 partners with UNC80 to form a pillar-shaped heterodimer that docks onto the intracellular face of NALCN through tripartite contacts with the channel's cytoplasmic loops; two of these interfaces drive proper cell-surface localization, while a third relieves channel autoinhibition by extracting the auto-inhibitory CTD Interacting Helix from its binding site [#0]. UNC79 is bridged to NALCN through UNC80, and this UNC80 interaction is required for dendritic targeting of the complex [#2]. Functionally, UNC79 (with UNC80 and FAM155A) is needed to reconstitute a constitutively active, divalent-blocked monovalent cation current in heterologous systems [#7] and confers the G protein-dependent sodium leak current that is activated by lowering extracellular Ca2+ [#1]. Beyond gating, UNC79 acts post-transcriptionally to stabilize NALCN/NA protein levels and localization, with channel subunits showing mutual interdependence for steady-state abundance without changes in transcript level [#3, #4, #5]. Heterozygous loss-of-function variants in UNC79 cause a neurodevelopmental syndrome, recapitulated by seizure phenotypes in flies and learning/memory deficits in heterozygous mice [#12].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1987,\n      \"claim\": \"Established the first phenotypic handle on UNC79 by showing its mutation alters whole-animal anesthetic sensitivity, and placed it in a defined genetic pathway with UNC80 and the gap-junction gene unc-9.\",\n      \"evidence\": \"Anesthetic dose-response and suppressor epistasis in C. elegans\",\n      \"pmids\": [\"3576211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular identity or biochemical activity defined\", \"Link to an ion channel not yet established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated that the mammalian UNC79 homolog is essential for a specific neural behavior, indicating a non-redundant physiological role in vivo.\",\n      \"evidence\": \"Gene-targeted knockout mice with adipsia behavioral phenotyping\",\n      \"pmids\": [\"16807365\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of the behavioral defect not characterized\", \"No connection to NALCN drawn in this study\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved how UNC79 regulates the channel by showing it controls NALCN/NA protein levels post-transcriptionally, placing it upstream of the channel in a conserved pathway.\",\n      \"evidence\": \"Genetic epistasis and protein-versus-mRNA quantification in Drosophila and C. elegans\",\n      \"pmids\": [\"17350263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of protein stabilization unknown\", \"Direct physical association with the channel not yet shown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that UNC79 is required for proper axonal localization of the NALCN ortholog and for propagating neuronal activity to synapses, linking the protein to channel trafficking and function.\",\n      \"evidence\": \"In vivo calcium imaging and fluorescent localization in C. elegans loss-of-function mutants\",\n      \"pmids\": [\"18336069\", \"19074276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether localization defect is direct or downstream of reduced channel abundance unclear\", \"Molecular trafficking machinery not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined UNC79 as a bona fide complex member that confers extracellular Ca2+ sensitivity and G protein-dependent leak current, establishing its mechanistic contribution to channel gating.\",\n      \"evidence\": \"Knockout mouse hippocampal electrophysiology and Ca2+-sensitivity assays; positional cloning with ethanol/isoflurane pharmacology\",\n      \"pmids\": [\"21040849\", \"20714347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Ca2+ sensitivity not resolved\", \"Identity of coupling G protein not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated an interdependent post-transcriptional regulatory loop among UNC79, UNC80, and NA, and showed UNC79 has functions beyond promoting subunit expression, refining its role as more than a chaperone.\",\n      \"evidence\": \"Immunoprecipitation, protein/transcript quantification, and genetic rescue in Drosophila pacemaker neurons\",\n      \"pmids\": [\"24223770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the function not bypassed by increased NA protein undefined\", \"Molecular basis of mutual stabilization unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Positioned the UNC79/NCA channel upstream of gap junctions in a sleep-regulation circuit, extending the pathway to a defined behavioral output.\",\n      \"evidence\": \"Genetic epistasis with egl-4 and innexin suppressors and arousal-threshold sleep assays in C. elegans\",\n      \"pmids\": [\"30323068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular site of action within sleep circuitry not pinpointed\", \"Direct molecular link to innexins not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Reconstituted the minimal functional channel and mapped the UNC80 domain required for UNC79 binding and dendritic targeting, distinguishing trafficking from current-carrying functions.\",\n      \"evidence\": \"Heterologous co-expression electrophysiology; reciprocal Co-IP, domain deletion, and localization imaging\",\n      \"pmids\": [\"32494638\", \"32620897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the UNC79-UNC80 interaction directs dendritic localization unresolved\", \"Stoichiometry within native complex not defined here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed spatially separable neuronal functions for UNC79, acting in mushroom body neurons for sleep and starvation resistance distinct from its pacemaker-neuron role in rhythmicity.\",\n      \"evidence\": \"Tissue-specific RNAi and rescue with behavioral assays in Drosophila\",\n      \"pmids\": [\"34849820\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether distinct functions reflect different channel partners unclear\", \"Molecular outputs in mushroom body neurons not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the structural mechanism: UNC79 and UNC80 form a pillar-shaped heterodimer that tethers to NALCN and relieves autoinhibition, unifying trafficking and gating roles at atomic resolution.\",\n      \"evidence\": \"Cryo-EM of the mammalian NALCN-FAM155A-UNC79-UNC80 complex with functional validation of interfaces\",\n      \"pmids\": [\"35550517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational dynamics during channel activation not captured\", \"How extracellular Ca2+ sensing is transduced to the cytoplasmic UNC79-UNC80 module unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established UNC79 haploinsufficiency as causally linked to human neurodevelopmental pathology, connecting molecular function to disease.\",\n      \"evidence\": \"Human genetics with Drosophila seizure assays and heterozygous mouse learning/memory phenotyping\",\n      \"pmids\": [\"37183800\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Human genetic association is associative; causality rests on model organisms\", \"How partial loss of UNC79 alters NALCN function in human neurons not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How extracellular Ca2+ and G protein signals are mechanistically transduced through the cytoplasmic UNC79-UNC80 module to gate NALCN, and how UNC79 selects among distinct neuronal functions, remain open.\",\n      \"evidence\": \"Not yet addressed in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the Ca2+-sensing or G protein-coupled state\", \"Direct biochemical mechanism of post-transcriptional protein stabilization unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 5, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\"NALCN-FAM155A-UNC79-UNC80 channel complex\"],\n    \"partners\": [\"UNC80\", \"NALCN\", \"FAM155A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}