{"gene":"CHRNA3","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2021,"finding":"Loss-of-function variants in CHRNA3 (compound heterozygous frameshift p.L303Dfs*115/missense p.D230N, or homozygous frameshift) cause familial autonomic ganglionopathy with diffuse panautonomic failure (severe neurogenic orthostatic hypotension, miosis, constipation, low norepinephrine). Structural modeling placed the p.D230N variant at the subunit–subunit interface of the nAChR pentameric complex, predicting destabilization of receptor assembly.","method":"Whole-exome sequencing of affected individuals; structural modeling of the D230N variant at the CHRNA3/nAChR subunit interface; cosegregation analysis in two independent families","journal":"Neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human genetics with clear loss-of-function variants cosegregating with phenotype, structural modeling, two independent families; no in vitro reconstitution of receptor assembly","pmids":["33947782"],"is_preprint":false},{"year":2024,"finding":"Novel CHRNA3 compound heterozygous variants identified in a patient with neurogenic bladder, vesicoureteral reflux, mydriasis, and gastrointestinal dysmotility, extending the phenotypic spectrum of CHRNA3 disruption to include CAKUT with dysautonomia.","method":"Clinical genetic sequencing identifying novel compound heterozygous CHRNA3 variants in a single patient; phenotypic characterization","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case report, no functional validation of variants","pmids":["38192228"],"is_preprint":false},{"year":2013,"finding":"SNPs rs8023462 and rs6495309 in the CHRNA3/B4 intergenic region bind nuclear proteins in an allele-specific manner (EMSA), and GATA transcription factors bind rs8023462 only when the minor/risk allele is present. Luciferase reporter assays showed that these SNPs and surrounding sequences influence gene expression in a cell-type- and haplotype-dependent manner.","method":"In vitro luciferase reporter assay in neuronal and lung cancer cell lines; electrophoretic mobility shift assay (EMSA) with nuclear protein extracts; GATA factor binding characterization","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal in vitro methods (luciferase + EMSA), single lab, allele-specific binding demonstrated","pmids":["23872218"],"is_preprint":false},{"year":2025,"finding":"rs2036527 is a cis-regulatory variant for both CHRNA3 and CHRNA5: chromosome conformation capture (3C) showed that the genomic segment containing rs2036527 physically interacts with the CHRNA3 promoter; luciferase assay demonstrated that rs2036527 alters enhancer activity; ChIP identified FOXA2 as the transcription factor binding this enhancer. Allele-specific expression analysis confirmed overexpression of the C allele at rs1051730 (synonymous variant in CHRNA3) in lung tissues, consistent with a cis-regulatory mechanism.","method":"Chromosome conformation capture (3C); luciferase enhancer assay; chromatin immunoprecipitation (ChIP) for FOXA2; allele-specific expression analysis; LD analysis with 1000 Genomes data","journal":"The American journal on addictions","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal functional genomics methods (3C, luciferase, ChIP, ASE) in single study; transcription factor identity experimentally established","pmids":["40755048"],"is_preprint":false},{"year":2011,"finding":"CHRNA3 and CHRNA5 promoter haplotype constructs tested in luciferase reporter assays showed no significant difference in CHRNA3 promoter activity among haplotypes, but CHRNA5 promoter activity was reduced by the combination of deletion at rs3841324 and variation at rs503464 (likely via loss of SP-1 binding site). Allelic expression imbalance (AEI) at CHRNA3 rs1051730 coding SNP showed equivalent allelic expression in most post-mortem brain samples.","method":"Luciferase reporter assay in BE(2)-C neuroblastoma cells; allelic expression imbalance (AEI) analysis in post-mortem human brain tissue","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 2 / Weak — two methods but CHRNA3-specific result is largely negative (no haplotype-driven expression difference); single lab","pmids":["21858091"],"is_preprint":false},{"year":2025,"finding":"In zebrafish, chrna3 loss-of-function mutants show blunted biphasic alcohol response (prolonged self-administration, increased gregariousness, and reduced transition from alcohol attraction to aversion), establishing that chrna3 is required for normal alcohol aversion. Transcriptomic analysis of mutant brains revealed altered glutamatergic, GABAergic, and cholinergic signaling.","method":"Two-choice self-administration zebrafish assay with chrna3 loss-of-function mutants; behavioral phenotyping (locomotion, shoaling, anxiety-like behavior); transcriptomic analysis of mutant vs wild-type brains","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with defined behavioral phenotype, transcriptomic follow-up, replicated from preprint; zebrafish ortholog","pmids":["40992927"],"is_preprint":false},{"year":2010,"finding":"Two common CHRNA3 polymorphisms (rs1051730/rs1317286), which are in strong linkage disequilibrium, are associated with prepulse inhibition (PPI) of the acoustic startle response in both healthy volunteers and schizophrenia patients (combined p=0.0027 across two independent samples), indicating that CHRNA3 variation influences sensorimotor gating.","method":"Genetic association study with PPI measurement in two independent human cohorts (107 healthy British volunteers; 73 German schizophrenia patients); combined p-value analysis","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — replicated across two independent samples, clear phenotypic readout (PPI), but association-based rather than direct mechanistic experiment","pmids":["20393456"],"is_preprint":false},{"year":2013,"finding":"In a controlled pharmacological experiment, nicotine significantly enhanced PPI in healthy nonsmoking volunteers homozygous for the CHRNA3 rs1051730 TT genotype but tended to worsen PPI in TC and CC carriers, demonstrating that the effect of nicotine on sensorimotor gating is modulated by CHRNA3 α3-subunit genotype.","method":"Double-blind, placebo-controlled, counterbalanced within-subjects pharmacological study; PPI measurement; cotinine plasma levels; genotyping of 52 nonsmoking volunteers","journal":"Psychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — controlled pharmacological challenge with functional readout, genotype × drug interaction clearly demonstrated, single lab","pmids":["23604333"],"is_preprint":false},{"year":2020,"finding":"Variants in the CHRNA5-CHRNA3-CHRNB4 region are associated with gastrointestinal adverse events during pharmacological smoking cessation treatment; this association was replicated in an independent cohort (TTURC) with same direction of effect, suggesting these variants tag a biological response pathway to smoking cessation medications.","method":"Logistic regression analysis in a placebo-controlled multi-arm smoking cessation trial (n=985 genotyped European-ancestry participants); replication of independent prior study findings","journal":"Nicotine & tobacco research","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — replication of genetic association across two independent trials, no molecular mechanism identified","pmids":["30882151"],"is_preprint":false},{"year":1998,"finding":"The genomic structure of CHRNA3 (intron-exon organization) was determined, providing the structural basis for comprehensive mutational analysis. CHRNA3 was mapped to the gene cluster with CHRNB4 and CHRNA5.","method":"Genomic cloning and sequencing; chromosomal mapping","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct experimental determination of gene structure, foundational structural characterization","pmids":["9921897"],"is_preprint":false},{"year":2001,"finding":"Characterization of the human CHRNA3 gene identified high-frequency polymorphisms. Mouse knockout data (cited within abstract) established that mice lacking the alpha3 subunit develop megacystis, failure of bladder strips to contract in response to nicotine, widely dilated ocular pupils, growth failure, and perinatal mortality, demonstrating CHRNA3's essential role in autonomic ganglionic neurotransmission controlling bladder and pupil function.","method":"Gene characterization and polymorphism analysis in MMIHS families; mouse alpha3 knockout phenotyping (referenced)","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse loss-of-function with clear autonomic phenotype; referenced from prior mouse studies, not performed de novo in this paper","pmids":["11450844"],"is_preprint":false},{"year":2026,"finding":"In a rat colitis model, CHRNA3⁺ mechanoinsensitive nociceptors (MINs, a subclass of silent C-fiber neurons co-expressing TrkA, pERK, and PIEZO2) innervate both the colon and lumbar skin via axonal bifurcation. Colitis activated CHRNA3⁺ nociceptors through the NGF-TrkA/pERK/PIEZO2 pathway, converting them from mechanoinsensitive to mechanosensitive. Pharmacological inhibition (pERK blockade) or chemogenetic silencing of CHRNA3⁺ MINs attenuated mechanical hypersensitivity and reduced the analgesic efficacy of electroacupuncture.","method":"Rat TNBS colitis model; neuroanatomical tracing; in situ hybridization; pharmacological blockade of pERK; chemogenetic silencing (DREADD); behavioral tests; spinal local field potential recording; visceral motor reflex recording","journal":"Chinese medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (tracing, pharmacology, chemogenetics, electrophysiology) in single study; rat model; CHRNA3 used as cell-type marker rather than the protein's receptor function being directly tested","pmids":["42157236"],"is_preprint":false},{"year":2024,"finding":"Single-nucleus RNA sequencing and in situ hybridization identified a cluster of vagal sensory neurons co-expressing Chrna3 and Cckar that is preferentially expressed in the right nodose ganglia of rats and mice; calcium imaging confirmed functional identity. This neuronal population also expresses Glp1r and Sctr, consistent with a gut-innervating chemosensing subtype.","method":"Single-nucleus RNA sequencing; in situ hybridization; calcium imaging; anatomical characterization of right vs. left nodose ganglia","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Chrna3 used as a cell-type marker; no functional manipulation of CHRNA3 protein itself; preprint, single lab","pmids":[],"is_preprint":true},{"year":2025,"finding":"Transgenic zebrafish lines expressing fluorescent reporters under chrna3, chrnb4, and chrna5 promoters revealed that chrna3 is expressed in PNS (enteric nervous system), CNS (diverse brain regions), and spinal cord (including primary motor neurons and dmrt3a-expressing interneurons), demonstrating co-expression with chrnb4 in primary motor neurons and establishing neuroanatomical distribution relevant to locomotion.","method":"Transgenic zebrafish reporter lines (chrna3:tdTomato); fluorescence imaging; co-labeling with interneuron and motor neuron markers","journal":"Developmental neurobiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization study without functional manipulation of CHRNA3; zebrafish ortholog; single lab","pmids":["39686588"],"is_preprint":false}],"current_model":"CHRNA3 encodes the α3 subunit of neuronal nicotinic acetylcholine receptors (nAChRs), which mediates fast cholinergic synaptic transmission in autonomic ganglia; loss-of-function mutations in humans cause familial panautonomic failure (neurogenic orthostatic hypotension, miosis, constipation), while the D230N missense variant is predicted to destabilize the pentameric receptor complex at the subunit interface. A cis-regulatory SNP (rs2036527) controls CHRNA3 and CHRNA5 expression through an enhancer bound by the transcription factor FOXA2 via a chromosomal looping mechanism. In zebrafish, chrna3 loss-of-function blunts the normal biphasic aversive response to alcohol through a mechanism involving glutamatergic, GABAergic, and cholinergic signaling. Common coding and regulatory variants in CHRNA3 modulate sensorimotor gating (prepulse inhibition) and its nicotine-induced enhancement, and are robustly associated with nicotine dependence, smoking quantity, COPD susceptibility, and lung cancer risk, likely by altering receptor function or expression levels."},"narrative":{"mechanistic_narrative":"CHRNA3 encodes the α3 subunit of neuronal nicotinic acetylcholine receptors, an essential component of fast cholinergic neurotransmission in autonomic ganglia [PMID:33947782, PMID:11450844]. Biallelic loss-of-function variants in humans cause familial autonomic ganglionopathy with diffuse panautonomic failure—severe neurogenic orthostatic hypotension, miosis, constipation, and low norepinephrine—with structural modeling placing the recurrent D230N missense variant at the subunit–subunit interface of the nAChR pentamer, predicting destabilized receptor assembly [PMID:33947782]; the phenotypic spectrum extends to neurogenic bladder and gastrointestinal dysmotility [PMID:38192228]. This autonomic role is corroborated by α3 knockout mice, which develop megacystis, bladder strips that fail to contract in response to nicotine, dilated pupils, and perinatal mortality [PMID:11450844]. CHRNA3 lies in a gene cluster with CHRNA5 and CHRNB4 [PMID:9921897], and its expression is governed by cis-regulatory variants: rs2036527 sits in an enhancer that physically loops to the CHRNA3 promoter and binds FOXA2, controlling allele-specific expression of CHRNA3 and CHRNA5 [PMID:40755048], while intergenic SNPs confer allele-specific nuclear-protein and GATA factor binding that modulates reporter expression [PMID:23872218]. Functionally, common CHRNA3 variants influence sensorimotor gating (prepulse inhibition) and its genotype-dependent modulation by nicotine [PMID:20393456, PMID:23604333], and in zebrafish chrna3 loss of function blunts the normal transition from alcohol attraction to aversion through altered glutamatergic, GABAergic, and cholinergic signaling [PMID:40992927].","teleology":[{"year":1998,"claim":"Establishing the intron-exon organization and chromosomal clustering of CHRNA3 provided the structural framework needed for systematic variant analysis and revealed its physical linkage to CHRNB4 and CHRNA5.","evidence":"genomic cloning, sequencing, and chromosomal mapping","pmids":["9921897"],"confidence":"Medium","gaps":["Does not address receptor function or expression regulation","No link to phenotype established at this stage"]},{"year":2001,"claim":"Knockout mouse phenotyping demonstrated that the α3 subunit is required for autonomic ganglionic neurotransmission, addressing whether CHRNA3 has an essential physiological role.","evidence":"α3 knockout mouse phenotyping (megacystis, nicotine-unresponsive bladder, mydriasis, perinatal lethality) referenced alongside human polymorphism analysis","pmids":["11450844"],"confidence":"Medium","gaps":["Mouse phenotype cited rather than generated de novo here","No human disease variant yet identified"]},{"year":2010,"claim":"Genetic association across two independent cohorts linked common CHRNA3 variants to prepulse inhibition, addressing whether α3-subunit variation affects a measurable neurophysiological function (sensorimotor gating).","evidence":"PPI association study in healthy volunteers and schizophrenia patients with combined p-value analysis","pmids":["20393456"],"confidence":"Medium","gaps":["Association-based, no direct mechanistic link to receptor function","Causal variant not resolved within the LD block"]},{"year":2011,"claim":"Reporter and allelic-imbalance experiments tested whether cluster haplotypes drive expression differences, finding the CHRNA3 promoter itself largely unaffected while CHRNA5 was regulated, refining where regulatory effects act.","evidence":"luciferase reporter assay in neuroblastoma cells and allelic expression imbalance analysis in post-mortem brain","pmids":["21858091"],"confidence":"Low","gaps":["CHRNA3-specific result is largely negative","Single lab, no functional follow-up on identified elements"]},{"year":2013,"claim":"EMSA and reporter assays identified allele-specific nuclear-protein and GATA factor binding at intergenic SNPs, addressing the molecular basis by which regulatory variants alter CHRNA3/B4 expression.","evidence":"luciferase reporter and EMSA with nuclear extracts in neuronal and lung cancer cell lines","pmids":["23872218"],"confidence":"Medium","gaps":["In vitro binding not validated in vivo at the endogenous locus","Quantitative effect on receptor levels not measured"]},{"year":2013,"claim":"A controlled pharmacological challenge showed that nicotine's effect on prepulse inhibition depends on CHRNA3 genotype, establishing a genotype × drug interaction at the level of sensorimotor gating.","evidence":"double-blind placebo-controlled within-subjects PPI study with genotyping and cotinine confirmation in nonsmokers","pmids":["23604333"],"confidence":"Medium","gaps":["Mechanism linking genotype to nicotine response at the receptor not resolved","Single lab, modest sample size"]},{"year":2020,"claim":"Replicated association tied cluster variants to gastrointestinal adverse events during smoking-cessation pharmacotherapy, addressing whether the locus tags a drug-response pathway.","evidence":"logistic regression in a placebo-controlled cessation trial with independent-cohort replication","pmids":["30882151"],"confidence":"Low","gaps":["No molecular mechanism identified","Cannot attribute effect specifically to CHRNA3 within the cluster"]},{"year":2021,"claim":"Whole-exome sequencing of two families established CHRNA3 loss of function as a cause of human panautonomic failure and modeled the D230N variant at the pentamer subunit interface, defining the disease mechanism as impaired receptor assembly.","evidence":"whole-exome sequencing, cosegregation in two families, structural modeling of D230N at the nAChR interface","pmids":["33947782"],"confidence":"Medium","gaps":["No in vitro reconstitution confirming assembly destabilization","Functional consequence of frameshift alleles not directly assayed"]},{"year":2024,"claim":"A new compound heterozygous case extended the CHRNA3 disruption phenotype to include CAKUT with dysautonomia, broadening the clinical spectrum.","evidence":"clinical genetic sequencing and phenotyping of a single patient","pmids":["38192228"],"confidence":"Low","gaps":["Single patient, no functional validation of variants","Causality not established beyond co-occurrence"]},{"year":2025,"claim":"Functional genomics identified rs2036527 as a cis-regulatory enhancer that loops to the CHRNA3 promoter and binds FOXA2, naming the transcription factor and physical mechanism controlling CHRNA3/CHRNA5 expression.","evidence":"chromosome conformation capture, luciferase enhancer assay, FOXA2 ChIP, and allele-specific expression analysis","pmids":["40755048"],"confidence":"Medium","gaps":["FOXA2 dependence not tested by knockdown at the endogenous locus","Tissue specificity of the enhancer not fully delineated"]},{"year":2025,"claim":"Zebrafish chrna3 loss-of-function established a causal requirement for the receptor in normal alcohol aversion, linking α3 to a behavioral phenotype with defined neurotransmitter-system correlates.","evidence":"two-choice self-administration assay in chrna3 mutants, behavioral phenotyping, and brain transcriptomics","pmids":["40992927"],"confidence":"Medium","gaps":["Circuit-level mechanism connecting chrna3 to aversion not resolved","Zebrafish ortholog; generalization to mammals untested"]},{"year":2026,"claim":"Using CHRNA3 as a marker, a subclass of mechanoinsensitive visceral nociceptors was shown to be sensitized in colitis via NGF-TrkA/pERK/PIEZO2 signaling, defining a sensory-neuron population relevant to visceral pain.","evidence":"rat colitis model with tracing, in situ hybridization, pERK blockade, chemogenetic silencing, and electrophysiology","pmids":["42157236"],"confidence":"Medium","gaps":["CHRNA3 used as a cell-type marker; its receptor function not directly tested here","Rat model; relevance to human visceral pain not established"]},{"year":null,"claim":"Whether the disease-associated and behavior-associated CHRNA3 variants act by altering pentamer assembly, channel gating, or expression level remains to be directly demonstrated in a reconstituted receptor system.","evidence":"no in vitro reconstitution or electrophysiological characterization of CHRNA3 variant receptors appears in the corpus","pmids":[],"confidence":"Low","gaps":["No functional reconstitution of human α3-containing receptors with disease variants","Subunit composition of the physiologically relevant receptor not defined in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,10,6]}],"complexes":["neuronal nicotinic acetylcholine receptor"],"partners":["CHRNA5","CHRNB4","FOXA2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P32297","full_name":"Neuronal acetylcholine receptor subunit alpha-3","aliases":[],"length_aa":505,"mass_kda":57.5,"function":"Component of neuronal acetylcholine receptors (nAChRs) that function as pentameric, ligand-gated cation channels with high calcium permeability among other activities. nAChRs are excitatory neurotrasnmitter receptors formed by a collection of nAChR subunits known to mediate synaptic transmission in the nervous system and the neuromuscular junction. Each nAchR subunit confers differential attributes to channel properties, including activation, deactivation and desensitization kinetics, pH sensitivity, cation permeability, and binding to allosteric modulators (PubMed:31488329, PubMed:31708116). CHRNA3 forms heteropentameric neuronal acetylcholine receptors with CHRNB2 and CHRNB4, with CHRNA5, and CHRNB3 as accesory subunits (PubMed:20881005, PubMed:8663494). CHRNA3:CHRNB4 being predominant in neurons of the autonomic ganglia, it is known as ganglionic nicotinic receptor (PubMed:31488329). CHRNA3:CHRNB4 or CHRNA3:CHRNA5:CHRNB4 play also an important role in the habenulo-interpeduncular tract, modulating the mesolimbic dopamine system and affecting reward circuits and addiction (By similarity). Hypothalamic CHRNA3:CHRNB4 nAChR activation by nicotine leads to activation of POMC neurons and a decrease in food intake (By similarity). Also expressed in the urothelium where it modulates reflex bladder activity by increasing intracellular calcium through extracellular influx and basal ATP release (By similarity)","subcellular_location":"Synaptic cell membrane; Cell membrane; Endoplasmic reticulum; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/P32297/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CHRNA3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CHRNA3","total_profiled":1310},"omim":[{"mim_id":"612052","title":"SMOKING AS A QUANTITATIVE TRAIT LOCUS 3; SQTL3","url":"https://www.omim.org/entry/612052"},{"mim_id":"610509","title":"RIC3 ACETYLCHOLINE RECEPTOR CHAPERONE; RIC3","url":"https://www.omim.org/entry/610509"},{"mim_id":"603204","title":"EPILEPSY, NOCTURNAL FRONTAL LOBE, 2; ENFL2","url":"https://www.omim.org/entry/603204"},{"mim_id":"600513","title":"EPILEPSY, NOCTURNAL FRONTAL LOBE, 1; ENFL1","url":"https://www.omim.org/entry/600513"},{"mim_id":"249210","title":"MEGACYSTIS-MICROCOLON-INTESTINAL HYPOPERISTALSIS SYNDROME 1; MMIHS1","url":"https://www.omim.org/entry/249210"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Primary cilium tip","reliability":"Additional"},{"location":"Primary cilium transition zone","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adrenal gland","ntpm":37.1},{"tissue":"lymphoid tissue","ntpm":61.2},{"tissue":"retina","ntpm":49.6}],"url":"https://www.proteinatlas.org/search/CHRNA3"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P32297","domains":[{"cath_id":"2.70.170.10","chopping":"35-240","consensus_level":"high","plddt":94.3226,"start":35,"end":240},{"cath_id":"1.20.58.390","chopping":"245-357_479-503","consensus_level":"high","plddt":88.2435,"start":245,"end":503}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P32297","model_url":"https://alphafold.ebi.ac.uk/files/AF-P32297-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P32297-F1-predicted_aligned_error_v6.png","plddt_mean":81.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CHRNA3","jax_strain_url":"https://www.jax.org/strain/search?query=CHRNA3"},"sequence":{"accession":"P32297","fasta_url":"https://rest.uniprot.org/uniprotkb/P32297.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P32297/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P32297"}},"corpus_meta":[{"pmid":"19706762","id":"PMC_19706762","title":"The CHRNA5-CHRNA3-CHRNB4 nicotinic receptor subunit gene cluster affects risk for nicotine dependence in African-Americans and in European-Americans.","date":"2009","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19706762","citation_count":218,"is_preprint":false},{"pmid":"21747048","id":"PMC_21747048","title":"Relationship between CYP2A6 and CHRNA5-CHRNA3-CHRNB4 variation and smoking behaviors and lung cancer risk.","date":"2011","source":"Journal of the National Cancer Institute","url":"https://pubmed.ncbi.nlm.nih.gov/21747048","citation_count":152,"is_preprint":false},{"pmid":"19429911","id":"PMC_19429911","title":"A common genetic variant in the 15q24 nicotinic acetylcholine receptor gene cluster (CHRNA5-CHRNA3-CHRNB4) is associated with a reduced ability of women to quit smoking in pregnancy.","date":"2009","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19429911","citation_count":121,"is_preprint":false},{"pmid":"22648373","id":"PMC_22648373","title":"Interplay of genetic risk factors (CHRNA5-CHRNA3-CHRNB4) and cessation treatments in smoking cessation success.","date":"2012","source":"The American journal of psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/22648373","citation_count":115,"is_preprint":false},{"pmid":"21593077","id":"PMC_21593077","title":"Genetic variation at CHRNA5-CHRNA3-CHRNB4 interacts with smoking status to influence body mass index.","date":"2011","source":"International journal of epidemiology","url":"https://pubmed.ncbi.nlm.nih.gov/21593077","citation_count":94,"is_preprint":false},{"pmid":"19628476","id":"PMC_19628476","title":"Association of serum cotinine level with a cluster of three nicotinic acetylcholine receptor genes (CHRNA3/CHRNA5/CHRNB4) on chromosome 15.","date":"2009","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19628476","citation_count":91,"is_preprint":false},{"pmid":"27029810","id":"PMC_27029810","title":"Variants near CHRNA3/5 and APOE have age- and sex-related effects on human lifespan.","date":"2016","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/27029810","citation_count":78,"is_preprint":false},{"pmid":"20393456","id":"PMC_20393456","title":"Sensorimotor gating is associated with CHRNA3 polymorphisms in schizophrenia and healthy volunteers.","date":"2010","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/20393456","citation_count":67,"is_preprint":false},{"pmid":"21690317","id":"PMC_21690317","title":"CHRNA3 rs1051730 genotype and short-term smoking cessation.","date":"2011","source":"Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco","url":"https://pubmed.ncbi.nlm.nih.gov/21690317","citation_count":62,"is_preprint":false},{"pmid":"21168125","id":"PMC_21168125","title":"TTC12-ANKK1-DRD2 and CHRNA5-CHRNA3-CHRNB4 influence different pathways leading to smoking behavior from adolescence to mid-adulthood.","date":"2010","source":"Biological psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/21168125","citation_count":62,"is_preprint":false},{"pmid":"22956269","id":"PMC_22956269","title":"Genetic variation in the 15q25 nicotinic acetylcholine receptor gene cluster (CHRNA5-CHRNA3-CHRNB4) interacts with maternal self-reported smoking status during pregnancy to influence birth weight.","date":"2012","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22956269","citation_count":59,"is_preprint":false},{"pmid":"22544838","id":"PMC_22544838","title":"From men to mice: CHRNA5/CHRNA3, smoking behavior and disease.","date":"2012","source":"Nicotine & tobacco research : official journal of the 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Structural modeling placed the p.D230N variant at the subunit–subunit interface of the nAChR pentameric complex, predicting destabilization of receptor assembly.\",\n      \"method\": \"Whole-exome sequencing of affected individuals; structural modeling of the D230N variant at the CHRNA3/nAChR subunit interface; cosegregation analysis in two independent families\",\n      \"journal\": \"Neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human genetics with clear loss-of-function variants cosegregating with phenotype, structural modeling, two independent families; no in vitro reconstitution of receptor assembly\",\n      \"pmids\": [\"33947782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Novel CHRNA3 compound heterozygous variants identified in a patient with neurogenic bladder, vesicoureteral reflux, mydriasis, and gastrointestinal dysmotility, extending the phenotypic spectrum of CHRNA3 disruption to include CAKUT with dysautonomia.\",\n      \"method\": \"Clinical genetic sequencing identifying novel compound heterozygous CHRNA3 variants in a single patient; phenotypic characterization\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case report, no functional validation of variants\",\n      \"pmids\": [\"38192228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SNPs rs8023462 and rs6495309 in the CHRNA3/B4 intergenic region bind nuclear proteins in an allele-specific manner (EMSA), and GATA transcription factors bind rs8023462 only when the minor/risk allele is present. Luciferase reporter assays showed that these SNPs and surrounding sequences influence gene expression in a cell-type- and haplotype-dependent manner.\",\n      \"method\": \"In vitro luciferase reporter assay in neuronal and lung cancer cell lines; electrophoretic mobility shift assay (EMSA) with nuclear protein extracts; GATA factor binding characterization\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal in vitro methods (luciferase + EMSA), single lab, allele-specific binding demonstrated\",\n      \"pmids\": [\"23872218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"rs2036527 is a cis-regulatory variant for both CHRNA3 and CHRNA5: chromosome conformation capture (3C) showed that the genomic segment containing rs2036527 physically interacts with the CHRNA3 promoter; luciferase assay demonstrated that rs2036527 alters enhancer activity; ChIP identified FOXA2 as the transcription factor binding this enhancer. Allele-specific expression analysis confirmed overexpression of the C allele at rs1051730 (synonymous variant in CHRNA3) in lung tissues, consistent with a cis-regulatory mechanism.\",\n      \"method\": \"Chromosome conformation capture (3C); luciferase enhancer assay; chromatin immunoprecipitation (ChIP) for FOXA2; allele-specific expression analysis; LD analysis with 1000 Genomes data\",\n      \"journal\": \"The American journal on addictions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal functional genomics methods (3C, luciferase, ChIP, ASE) in single study; transcription factor identity experimentally established\",\n      \"pmids\": [\"40755048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CHRNA3 and CHRNA5 promoter haplotype constructs tested in luciferase reporter assays showed no significant difference in CHRNA3 promoter activity among haplotypes, but CHRNA5 promoter activity was reduced by the combination of deletion at rs3841324 and variation at rs503464 (likely via loss of SP-1 binding site). Allelic expression imbalance (AEI) at CHRNA3 rs1051730 coding SNP showed equivalent allelic expression in most post-mortem brain samples.\",\n      \"method\": \"Luciferase reporter assay in BE(2)-C neuroblastoma cells; allelic expression imbalance (AEI) analysis in post-mortem human brain tissue\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — two methods but CHRNA3-specific result is largely negative (no haplotype-driven expression difference); single lab\",\n      \"pmids\": [\"21858091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish, chrna3 loss-of-function mutants show blunted biphasic alcohol response (prolonged self-administration, increased gregariousness, and reduced transition from alcohol attraction to aversion), establishing that chrna3 is required for normal alcohol aversion. Transcriptomic analysis of mutant brains revealed altered glutamatergic, GABAergic, and cholinergic signaling.\",\n      \"method\": \"Two-choice self-administration zebrafish assay with chrna3 loss-of-function mutants; behavioral phenotyping (locomotion, shoaling, anxiety-like behavior); transcriptomic analysis of mutant vs wild-type brains\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with defined behavioral phenotype, transcriptomic follow-up, replicated from preprint; zebrafish ortholog\",\n      \"pmids\": [\"40992927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Two common CHRNA3 polymorphisms (rs1051730/rs1317286), which are in strong linkage disequilibrium, are associated with prepulse inhibition (PPI) of the acoustic startle response in both healthy volunteers and schizophrenia patients (combined p=0.0027 across two independent samples), indicating that CHRNA3 variation influences sensorimotor gating.\",\n      \"method\": \"Genetic association study with PPI measurement in two independent human cohorts (107 healthy British volunteers; 73 German schizophrenia patients); combined p-value analysis\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — replicated across two independent samples, clear phenotypic readout (PPI), but association-based rather than direct mechanistic experiment\",\n      \"pmids\": [\"20393456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In a controlled pharmacological experiment, nicotine significantly enhanced PPI in healthy nonsmoking volunteers homozygous for the CHRNA3 rs1051730 TT genotype but tended to worsen PPI in TC and CC carriers, demonstrating that the effect of nicotine on sensorimotor gating is modulated by CHRNA3 α3-subunit genotype.\",\n      \"method\": \"Double-blind, placebo-controlled, counterbalanced within-subjects pharmacological study; PPI measurement; cotinine plasma levels; genotyping of 52 nonsmoking volunteers\",\n      \"journal\": \"Psychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — controlled pharmacological challenge with functional readout, genotype × drug interaction clearly demonstrated, single lab\",\n      \"pmids\": [\"23604333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Variants in the CHRNA5-CHRNA3-CHRNB4 region are associated with gastrointestinal adverse events during pharmacological smoking cessation treatment; this association was replicated in an independent cohort (TTURC) with same direction of effect, suggesting these variants tag a biological response pathway to smoking cessation medications.\",\n      \"method\": \"Logistic regression analysis in a placebo-controlled multi-arm smoking cessation trial (n=985 genotyped European-ancestry participants); replication of independent prior study findings\",\n      \"journal\": \"Nicotine & tobacco research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — replication of genetic association across two independent trials, no molecular mechanism identified\",\n      \"pmids\": [\"30882151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The genomic structure of CHRNA3 (intron-exon organization) was determined, providing the structural basis for comprehensive mutational analysis. CHRNA3 was mapped to the gene cluster with CHRNB4 and CHRNA5.\",\n      \"method\": \"Genomic cloning and sequencing; chromosomal mapping\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct experimental determination of gene structure, foundational structural characterization\",\n      \"pmids\": [\"9921897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Characterization of the human CHRNA3 gene identified high-frequency polymorphisms. Mouse knockout data (cited within abstract) established that mice lacking the alpha3 subunit develop megacystis, failure of bladder strips to contract in response to nicotine, widely dilated ocular pupils, growth failure, and perinatal mortality, demonstrating CHRNA3's essential role in autonomic ganglionic neurotransmission controlling bladder and pupil function.\",\n      \"method\": \"Gene characterization and polymorphism analysis in MMIHS families; mouse alpha3 knockout phenotyping (referenced)\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse loss-of-function with clear autonomic phenotype; referenced from prior mouse studies, not performed de novo in this paper\",\n      \"pmids\": [\"11450844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In a rat colitis model, CHRNA3⁺ mechanoinsensitive nociceptors (MINs, a subclass of silent C-fiber neurons co-expressing TrkA, pERK, and PIEZO2) innervate both the colon and lumbar skin via axonal bifurcation. Colitis activated CHRNA3⁺ nociceptors through the NGF-TrkA/pERK/PIEZO2 pathway, converting them from mechanoinsensitive to mechanosensitive. Pharmacological inhibition (pERK blockade) or chemogenetic silencing of CHRNA3⁺ MINs attenuated mechanical hypersensitivity and reduced the analgesic efficacy of electroacupuncture.\",\n      \"method\": \"Rat TNBS colitis model; neuroanatomical tracing; in situ hybridization; pharmacological blockade of pERK; chemogenetic silencing (DREADD); behavioral tests; spinal local field potential recording; visceral motor reflex recording\",\n      \"journal\": \"Chinese medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (tracing, pharmacology, chemogenetics, electrophysiology) in single study; rat model; CHRNA3 used as cell-type marker rather than the protein's receptor function being directly tested\",\n      \"pmids\": [\"42157236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Single-nucleus RNA sequencing and in situ hybridization identified a cluster of vagal sensory neurons co-expressing Chrna3 and Cckar that is preferentially expressed in the right nodose ganglia of rats and mice; calcium imaging confirmed functional identity. This neuronal population also expresses Glp1r and Sctr, consistent with a gut-innervating chemosensing subtype.\",\n      \"method\": \"Single-nucleus RNA sequencing; in situ hybridization; calcium imaging; anatomical characterization of right vs. left nodose ganglia\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Chrna3 used as a cell-type marker; no functional manipulation of CHRNA3 protein itself; preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Transgenic zebrafish lines expressing fluorescent reporters under chrna3, chrnb4, and chrna5 promoters revealed that chrna3 is expressed in PNS (enteric nervous system), CNS (diverse brain regions), and spinal cord (including primary motor neurons and dmrt3a-expressing interneurons), demonstrating co-expression with chrnb4 in primary motor neurons and establishing neuroanatomical distribution relevant to locomotion.\",\n      \"method\": \"Transgenic zebrafish reporter lines (chrna3:tdTomato); fluorescence imaging; co-labeling with interneuron and motor neuron markers\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization study without functional manipulation of CHRNA3; zebrafish ortholog; single lab\",\n      \"pmids\": [\"39686588\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CHRNA3 encodes the α3 subunit of neuronal nicotinic acetylcholine receptors (nAChRs), which mediates fast cholinergic synaptic transmission in autonomic ganglia; loss-of-function mutations in humans cause familial panautonomic failure (neurogenic orthostatic hypotension, miosis, constipation), while the D230N missense variant is predicted to destabilize the pentameric receptor complex at the subunit interface. A cis-regulatory SNP (rs2036527) controls CHRNA3 and CHRNA5 expression through an enhancer bound by the transcription factor FOXA2 via a chromosomal looping mechanism. In zebrafish, chrna3 loss-of-function blunts the normal biphasic aversive response to alcohol through a mechanism involving glutamatergic, GABAergic, and cholinergic signaling. Common coding and regulatory variants in CHRNA3 modulate sensorimotor gating (prepulse inhibition) and its nicotine-induced enhancement, and are robustly associated with nicotine dependence, smoking quantity, COPD susceptibility, and lung cancer risk, likely by altering receptor function or expression levels.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CHRNA3 encodes the α3 subunit of neuronal nicotinic acetylcholine receptors, an essential component of fast cholinergic neurotransmission in autonomic ganglia [#0, #10]. Biallelic loss-of-function variants in humans cause familial autonomic ganglionopathy with diffuse panautonomic failure—severe neurogenic orthostatic hypotension, miosis, constipation, and low norepinephrine—with structural modeling placing the recurrent D230N missense variant at the subunit–subunit interface of the nAChR pentamer, predicting destabilized receptor assembly [#0]; the phenotypic spectrum extends to neurogenic bladder and gastrointestinal dysmotility [#1]. This autonomic role is corroborated by α3 knockout mice, which develop megacystis, bladder strips that fail to contract in response to nicotine, dilated pupils, and perinatal mortality [#10]. CHRNA3 lies in a gene cluster with CHRNA5 and CHRNB4 [#9], and its expression is governed by cis-regulatory variants: rs2036527 sits in an enhancer that physically loops to the CHRNA3 promoter and binds FOXA2, controlling allele-specific expression of CHRNA3 and CHRNA5 [#3], while intergenic SNPs confer allele-specific nuclear-protein and GATA factor binding that modulates reporter expression [#2]. Functionally, common CHRNA3 variants influence sensorimotor gating (prepulse inhibition) and its genotype-dependent modulation by nicotine [#6, #7], and in zebrafish chrna3 loss of function blunts the normal transition from alcohol attraction to aversion through altered glutamatergic, GABAergic, and cholinergic signaling [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing the intron-exon organization and chromosomal clustering of CHRNA3 provided the structural framework needed for systematic variant analysis and revealed its physical linkage to CHRNB4 and CHRNA5.\",\n      \"evidence\": \"genomic cloning, sequencing, and chromosomal mapping\",\n      \"pmids\": [\"9921897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not address receptor function or expression regulation\", \"No link to phenotype established at this stage\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Knockout mouse phenotyping demonstrated that the α3 subunit is required for autonomic ganglionic neurotransmission, addressing whether CHRNA3 has an essential physiological role.\",\n      \"evidence\": \"α3 knockout mouse phenotyping (megacystis, nicotine-unresponsive bladder, mydriasis, perinatal lethality) referenced alongside human polymorphism analysis\",\n      \"pmids\": [\"11450844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mouse phenotype cited rather than generated de novo here\", \"No human disease variant yet identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic association across two independent cohorts linked common CHRNA3 variants to prepulse inhibition, addressing whether α3-subunit variation affects a measurable neurophysiological function (sensorimotor gating).\",\n      \"evidence\": \"PPI association study in healthy volunteers and schizophrenia patients with combined p-value analysis\",\n      \"pmids\": [\"20393456\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Association-based, no direct mechanistic link to receptor function\", \"Causal variant not resolved within the LD block\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Reporter and allelic-imbalance experiments tested whether cluster haplotypes drive expression differences, finding the CHRNA3 promoter itself largely unaffected while CHRNA5 was regulated, refining where regulatory effects act.\",\n      \"evidence\": \"luciferase reporter assay in neuroblastoma cells and allelic expression imbalance analysis in post-mortem brain\",\n      \"pmids\": [\"21858091\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"CHRNA3-specific result is largely negative\", \"Single lab, no functional follow-up on identified elements\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"EMSA and reporter assays identified allele-specific nuclear-protein and GATA factor binding at intergenic SNPs, addressing the molecular basis by which regulatory variants alter CHRNA3/B4 expression.\",\n      \"evidence\": \"luciferase reporter and EMSA with nuclear extracts in neuronal and lung cancer cell lines\",\n      \"pmids\": [\"23872218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro binding not validated in vivo at the endogenous locus\", \"Quantitative effect on receptor levels not measured\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"A controlled pharmacological challenge showed that nicotine's effect on prepulse inhibition depends on CHRNA3 genotype, establishing a genotype × drug interaction at the level of sensorimotor gating.\",\n      \"evidence\": \"double-blind placebo-controlled within-subjects PPI study with genotyping and cotinine confirmation in nonsmokers\",\n      \"pmids\": [\"23604333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking genotype to nicotine response at the receptor not resolved\", \"Single lab, modest sample size\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Replicated association tied cluster variants to gastrointestinal adverse events during smoking-cessation pharmacotherapy, addressing whether the locus tags a drug-response pathway.\",\n      \"evidence\": \"logistic regression in a placebo-controlled cessation trial with independent-cohort replication\",\n      \"pmids\": [\"30882151\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No molecular mechanism identified\", \"Cannot attribute effect specifically to CHRNA3 within the cluster\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whole-exome sequencing of two families established CHRNA3 loss of function as a cause of human panautonomic failure and modeled the D230N variant at the pentamer subunit interface, defining the disease mechanism as impaired receptor assembly.\",\n      \"evidence\": \"whole-exome sequencing, cosegregation in two families, structural modeling of D230N at the nAChR interface\",\n      \"pmids\": [\"33947782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution confirming assembly destabilization\", \"Functional consequence of frameshift alleles not directly assayed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A new compound heterozygous case extended the CHRNA3 disruption phenotype to include CAKUT with dysautonomia, broadening the clinical spectrum.\",\n      \"evidence\": \"clinical genetic sequencing and phenotyping of a single patient\",\n      \"pmids\": [\"38192228\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient, no functional validation of variants\", \"Causality not established beyond co-occurrence\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Functional genomics identified rs2036527 as a cis-regulatory enhancer that loops to the CHRNA3 promoter and binds FOXA2, naming the transcription factor and physical mechanism controlling CHRNA3/CHRNA5 expression.\",\n      \"evidence\": \"chromosome conformation capture, luciferase enhancer assay, FOXA2 ChIP, and allele-specific expression analysis\",\n      \"pmids\": [\"40755048\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FOXA2 dependence not tested by knockdown at the endogenous locus\", \"Tissue specificity of the enhancer not fully delineated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Zebrafish chrna3 loss-of-function established a causal requirement for the receptor in normal alcohol aversion, linking α3 to a behavioral phenotype with defined neurotransmitter-system correlates.\",\n      \"evidence\": \"two-choice self-administration assay in chrna3 mutants, behavioral phenotyping, and brain transcriptomics\",\n      \"pmids\": [\"40992927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Circuit-level mechanism connecting chrna3 to aversion not resolved\", \"Zebrafish ortholog; generalization to mammals untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Using CHRNA3 as a marker, a subclass of mechanoinsensitive visceral nociceptors was shown to be sensitized in colitis via NGF-TrkA/pERK/PIEZO2 signaling, defining a sensory-neuron population relevant to visceral pain.\",\n      \"evidence\": \"rat colitis model with tracing, in situ hybridization, pERK blockade, chemogenetic silencing, and electrophysiology\",\n      \"pmids\": [\"42157236\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CHRNA3 used as a cell-type marker; its receptor function not directly tested here\", \"Rat model; relevance to human visceral pain not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether the disease-associated and behavior-associated CHRNA3 variants act by altering pentamer assembly, channel gating, or expression level remains to be directly demonstrated in a reconstituted receptor system.\",\n      \"evidence\": \"no in vitro reconstitution or electrophysiological characterization of CHRNA3 variant receptors appears in the corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No functional reconstitution of human α3-containing receptors with disease variants\", \"Subunit composition of the physiologically relevant receptor not defined in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 10, 6]}\n    ],\n    \"complexes\": [\"neuronal nicotinic acetylcholine receptor\"],\n    \"partners\": [\"CHRNA5\", \"CHRNB4\", \"FOXA2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}