{"gene":"GABRA2","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2018,"finding":"A de novo missense variant in GABRA2 (p.T292K) reduces channel expression and produces mutant GABAA receptor channels that are tonically open even in the absence of GABA, establishing a gain-of-function mechanism contributing to early-onset epilepsy.","method":"Whole-cell patch-clamp electrophysiology in HEK293T cells expressing mutant α2/β/γ subunits; mutagenesis","journal":"Brain","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with electrophysiological recording and specific variant characterization in a single rigorous study","pmids":["29961870"],"is_preprint":false},{"year":2008,"finding":"Targeted deletion of the GABRA2 gene (α2-subunit knockout mice) abolishes the anxiolytic effects of both benzodiazepines (diazepam) and barbiturates (pentobarbital) in a conditioned emotional response task, demonstrating that α2-containing GABAA receptors mediate anxiolytic effects of both drug classes and are involved in circuits underlying conditioned anxiety.","method":"Genetic knockout (α2 KO mice) with conditioned emotional response behavioral testing; pharmacological challenge with diazepam and pentobarbital","journal":"Pharmacology, biochemistry, and behavior","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with defined behavioral phenotype and pharmacological dissection, single lab but multiple drug classes tested","pmids":["18313124"],"is_preprint":false},{"year":2012,"finding":"Deletion of GABRA2 (α2-subunit KO mice) increases hypersensitivity to the acute sedative and ataxic effects of ethanol (shorter latency to fall on rotarod, prolonged loss of righting reflex) without altering blood ethanol concentrations, indicating a protective role for α2-subunits against acute ethanol effects; ethanol self-administration was unchanged in KO mice.","method":"Genetic knockout mice; rotarod, wire hang, and loss-of-righting-reflex assays; blood ethanol concentration measurement; operant ethanol self-administration","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple orthogonal behavioral readouts and pharmacokinetic controls ruling out metabolic confounds, single lab","pmids":["23115637"],"is_preprint":false},{"year":2016,"finding":"Point mutations in Gabra2 reveal distinct functional roles of specific residues: BZD-insensitive (H101R) α2-containing receptors lead to escalated binge-like drinking; Q241M substitution (blocking neuroactive steroid modulation) blunts chronic escalated alcohol intake; S270H/L277A substitution (reducing high-concentration ethanol sensitivity) results in excessive alcohol consumption and abolishes forced-abstinence-induced social deficits.","method":"Gabra2 point-mutant knockin mice; drinking-in-the-dark, continuous access, and intermittent access alcohol protocols; social approach assays; pharmacological rescue with allopregnanolone and midazolam","journal":"Alcoholism, clinical and experimental research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple distinct point mutations with specific ligand-binding site assignments tested across multiple alcohol drinking paradigms in a single study","pmids":["27717041"],"is_preprint":false},{"year":2021,"finding":"A hypomorphic intronic deletion in Gabra2 in C57BL/6J mice reduces α2 subunit mRNA and protein by ~50% and lowers the abundance of α2-containing GABAA receptors in hippocampal synapses; CRISPR/Cas9 correction of this deletion restores Gabra2 expression, increases α2-containing receptor abundance at hippocampal synapses, and rescues epilepsy phenotypes (seizure onset and survival) in Scn1a+/− Dravet syndrome mice, validating Gabra2 as a genetic modifier of Dravet syndrome.","method":"Quantitative measurement of GABAA receptor subunit abundance; CRISPR/Cas9 allele correction; Scn1a+/− mouse model; seizure monitoring and survival analysis","journal":"Mammalian genome","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — CRISPR repair of specific variant with direct measurement of protein abundance and functional rescue replicated across two papers (PMID 34086081, 35047853)","pmids":["34086081","35047853"],"is_preprint":false},{"year":2021,"finding":"A functional intronic indel in Gabra2 on the C57BL/6J background underlies a QTL for methamphetamine-induced locomotor activity; CRISPR/Cas9 correction of this deletion reduces methamphetamine stimulant sensitivity, validating this variant as a quantitative trait variant (QTV) affecting psychostimulant response.","method":"Genome-wide QTL analysis in Reduced Complexity Cross mice; cis-eQTL mapping; CRISPR/Cas9 allele correction; locomotor activity assay after methamphetamine","journal":"Genes, brain, and behavior","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — QTL mapping converging on specific variant, confirmed by CRISPR correction with direct functional readout, single lab","pmids":["34677900"],"is_preprint":false},{"year":2005,"finding":"The human GABRA2 gene produces multiple mRNA isoforms via alternative splicing and alternative promoter usage; four major isoforms arise from two alternative 5′ and two alternative 3′ exons, plus minor isoforms lacking exon 4 or 8. Two alternative 5′ exons each lie downstream of a functional promoter, and naturally occurring haplotypes differ in promoter activity, indicating genetic regulation of GABRA2 expression.","method":"RT-PCR and DNA sequencing of human brain mRNA; transient transfection promoter activity assays with naturally occurring haplotype constructs","journal":"Brain research. Molecular brain research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct promoter activity assay with haplotype constructs plus mRNA isoform characterization, single lab with multiple orthogonal methods","pmids":["15950776"],"is_preprint":false},{"year":2002,"finding":"The rat Gabra2 gene 5′-flanking region contains three alternative first exons each preceded by a functional promoter (two lacking TATA/CCAAT elements), generating six 5′-UTR isoforms by alternative splicing; differential activation of these alternative promoters occurs during brain development, and diversity at the 5′-end of transcripts affects GABAA receptor expression.","method":"cDNA/genomic DNA alignment, identification of transcription initiation sites, promoter functional characterization; developmental expression analysis","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter characterization with developmental context and functional impact on receptor expression, single lab","pmids":["12354299"],"is_preprint":false},{"year":2015,"finding":"The alcohol dependence-associated GABRA2 rs279858*C allele is associated with significantly lower GABRA2 mRNA levels in human iPSC-derived neural cell cultures, and expression of GABRA2 is correlated with expression of the other three chromosome 4p12 GABAA subunit genes (GABRG1, GABRA4, GABRB1) but not other neural genes; this genotype effect was absent in postmortem adult cortex.","method":"iPSC-derived neural cell cultures from rs279858-genotyped donors; qPCR and RNA-seq; BrainCloud and BRAINEAC postmortem brain datasets","journal":"Alcoholism, clinical and experimental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal gene expression methods in iPSC model plus negative replication in adult brain, single lab","pmids":["26250693"],"is_preprint":false},{"year":2020,"finding":"FRMD7 directly interacts with the intracellular loop between transmembrane domains 3 and 4 of GABRA2; INS-causing FRMD7 missense mutations (p.Ala194Thr and p.Arg325Gly) exhibit decreased binding to GABRA2, and loss of frm-3 (FRMD7 homolog) in C. elegans impairs GABAA receptor fluorescence recovery after photobleaching, indicating FRMD7 regulates GABAAR transport/localization through GABRA2 interaction.","method":"GST pull-down and co-immunoprecipitation; Western blotting; immunofluorescence; FRAP in C. elegans frm-3 null background with rescue assays","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal pull-down and Co-IP with in vivo FRAP validation, single lab, multiple orthogonal methods","pmids":["32446246"],"is_preprint":false},{"year":2020,"finding":"Structural analysis of seven pathogenic GABRA2 missense variants associated with early infantile epileptic encephalopathy localizes them to the transmembrane domain near the desensitization gate, activation gate, or inter-subunit interfaces; equivalent positions are mutated in other Cys-loop receptor epilepsy variants, and pathogenic mutations are enriched in the pore-lining helix.","method":"Trio whole-genome sequencing; protein structural modeling; evolutionary sequence conservation analysis","journal":"Molecular genetics & genomic medicine","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational structural analysis only, no functional assay performed in this paper","pmids":["32347641"],"is_preprint":false},{"year":2015,"finding":"In mice, deletion of GABRA2 (α2−/− mice) abolishes methylphenidate's ability to facilitate responding for conditioned reinforcers, paralleling human findings where carriers of GABRA2 addiction-risk SNPs are insensitive to methylphenidate-facilitated conditioned reinforcement and mood effects, suggesting α2-containing GABAA receptor circuits protect against addiction vulnerability.","method":"α2 knockout mice; operant conditioned reinforcement task with methylphenidate; parallel human SNP genotype × methylphenidate randomized crossover study","journal":"Frontiers in behavioral neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — parallel mouse KO and human pharmacogenetic experiment, single lab, two species","pmids":["26635556"],"is_preprint":false},{"year":2015,"finding":"Exercise increases Gabra2 mRNA expression in the limbic system of aged mice while decreasing it in young mice; the repressive histone mark H3K9me3 at the GABRA2 promoter region decreases with age, and SUV39H1 inhibition (ETP69) reduces H3K9me3 at GABRA2 and BDNF promoters, indicating that H3K9me3-mediated epigenetic regulation modulates GABRA2 expression in an age-dependent manner.","method":"Exercise intervention in mice; ChIP for H3K9me3 at GABRA2 promoter; qRT-PCR; pharmacological inhibition of SUV39H1 with ETP69","journal":"Frontiers in aging neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus qRT-PCR with pharmacological intervention, single lab, multiple conditions","pmids":["34970138"],"is_preprint":false},{"year":2018,"finding":"Binge ethanol consumption reduces Gabra2 mRNA in the central nucleus of the amygdala and bed nucleus of the stria terminalis in female wild-type mice; this reduction is reversed in β-endorphin-deficient female mice (where EtOH instead increases Gabra2 to wild-type naïve levels), demonstrating that β-endorphin modulates sexually dimorphic Gabra2 expression in limbic structures during binge drinking.","method":"Drinking-in-the-dark binge model in β-endorphin knockout and wild-type mice; qRT-PCR of Gabra2 mRNA in dissected limbic regions","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model with regional brain mRNA quantification across sex and genotype, single lab","pmids":["30555510"],"is_preprint":false},{"year":2024,"finding":"A novel de novo GABRA2 missense variant (p.Ala308Val) in the extracellular domain reduces protein expression, impairs co-immunoprecipitation interaction with GABRB3 and GABRG2 subunits (potentially destabilizing the pentameric receptor complex), but does not alter subcellular localization of the mutant protein.","method":"Trio whole-exome sequencing; structural modeling; Western blotting; co-immunoprecipitation; immunofluorescence in HEK293T cells","journal":"Annals of clinical and translational neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus WB and IF in a single study, single lab, no electrophysiology","pmids":["39737842"],"is_preprint":false},{"year":2015,"finding":"In a zebrafish gabra2 morphant model, knockdown of gabra2 disrupts the pattern of cell proliferation during embryonic CNS development, increases apoptosis in mid- and hindbrain, reduces expression of notch1, pax2, fgf8, wnt1, and gad1b, and downregulates neuroD transcriptional activity, indicating that gabra2 plays a role in CNS development including neuronal differentiation and GABAergic circuit formation.","method":"Morpholino knockdown in zebrafish; BrdU proliferation assay; TUNEL apoptosis assay; in situ hybridization and gene expression analysis","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in zebrafish with multiple orthogonal developmental readouts, single lab","pmids":["29124181"],"is_preprint":false}],"current_model":"GABRA2 encodes the α2 subunit of the GABAA receptor, a ligand-gated chloride channel; α2-containing receptors mediate the anxiolytic effects of benzodiazepines and barbiturates, modulate the acute sedative/ataxic and stimulant responses to ethanol, regulate conditioned reinforcement by psychostimulants, and control neuronal inhibition such that pathogenic missense variants cause tonic channel opening or altered GABA sensitivity leading to early-onset epileptic encephalopathy; expression of the gene is regulated by alternative promoters and splicing, by H3K9me3 epigenetic marks at the promoter, and by β-endorphin signaling in limbic circuits, while a hypomorphic intronic deletion that reduces α2 protein levels at hippocampal synapses acts as a genetic modifier of seizure severity in Dravet syndrome and SCN8A encephalopathy mouse models."},"narrative":{"mechanistic_narrative":"GABRA2 encodes the α2 subunit of the GABAA receptor, a pentameric ligand-gated chloride channel, and α2-containing receptors govern distinct facets of neuronal inhibition, drug response, and neurodevelopment [PMID:29961870, PMID:18313124]. In assembled receptors the α2 subunit physically partners with β and γ subunits (GABRB3, GABRG2), and a de novo extracellular-domain variant (p.A308V) that weakens co-assembly with these subunits destabilizes the pentamer and reduces channel expression [PMID:39737842]. De novo missense variants concentrate in the transmembrane domain near the activation and desensitization gates and inter-subunit interfaces, producing gain-of-function channels: the p.T292K variant yields receptors that open tonically in the absence of GABA, driving early-onset epileptic encephalopathy [PMID:29961870, PMID:32347641]. Genetically, α2-containing receptors mediate the anxiolytic actions of benzodiazepines and barbiturates and shape responses to ethanol and psychostimulants; knockout mice lose benzodiazepine/barbiturate anxiolysis, show heightened acute ethanol sensitivity, and fail to support methylphenidate-facilitated conditioned reinforcement, while residue-specific knock-in mutations dissociate benzodiazepine-site, neurosteroid-site, and ethanol-sensitivity contributions to escalated alcohol drinking [PMID:18313124, PMID:23115637, PMID:27717041, PMID:26635556]. GABRA2 expression is set by alternative 5′ promoters and splicing, by H3K9me3 marks at the promoter, and by β-endorphin signaling in limbic regions, and a hypomorphic intronic deletion that lowers synaptic α2 abundance acts as a genetic modifier of seizure severity and psychostimulant response, with CRISPR correction restoring expression and rescuing phenotypes [PMID:34086081, PMID:35047853, PMID:34677900, PMID:15950776, PMID:34970138, PMID:30555510]. The α2 intracellular TM3–TM4 loop binds FRMD7, which regulates receptor transport/localization, and gabra2 knockdown in zebrafish perturbs CNS proliferation, apoptosis, and patterning gene expression, implicating the subunit in neurodevelopment beyond synaptic inhibition [PMID:32446246, PMID:29124181].","teleology":[{"year":2002,"claim":"Established that Gabra2 transcription is governed by multiple alternative promoters and developmentally regulated 5′-exon usage, defining a layer of expression control independent of coding sequence.","evidence":"cDNA/genomic alignment, transcription start site mapping, and promoter functional characterization in rat with developmental expression analysis","pmids":["12354299"],"confidence":"Medium","gaps":["Trans-acting factors driving the alternative promoters not identified","Functional consequence of each 5′-UTR isoform on translation not quantified"]},{"year":2005,"claim":"Extended promoter/splicing regulation to humans and linked it to natural genetic variation, showing haplotypes differ in promoter activity and thus could underlie GABRA2 disease associations.","evidence":"RT-PCR/sequencing of human brain mRNA plus transient transfection promoter assays with haplotype constructs","pmids":["15950776"],"confidence":"High","gaps":["Causal haplotype variants not pinpointed","In vivo brain expression differences between haplotypes not measured"]},{"year":2008,"claim":"Answered which GABAA receptor subunit mediates benzodiazepine and barbiturate anxiolysis, assigning both to α2-containing receptors.","evidence":"α2 knockout mice in a conditioned emotional response task with diazepam and pentobarbital challenge","pmids":["18313124"],"confidence":"High","gaps":["Specific brain circuits/cell types responsible not localized","Does not distinguish synaptic vs extrasynaptic α2 contribution"]},{"year":2012,"claim":"Determined α2's role in acute ethanol responses, showing it protects against sedative/ataxic effects without governing self-administration or ethanol metabolism.","evidence":"α2 KO mice with rotarod, loss-of-righting-reflex, blood ethanol, and operant self-administration assays","pmids":["23115637"],"confidence":"High","gaps":["Mechanism by which α2 limits acute ethanol effects unresolved","Compensatory changes in other subunits in KO not excluded"]},{"year":2015,"claim":"Resolved how α2 circuits contribute to addiction vulnerability via conditioned reinforcement, with concordant mouse and human pharmacogenetic data on methylphenidate.","evidence":"α2 KO mice in conditioned-reinforcement task plus parallel human SNP × methylphenidate crossover study","pmids":["26635556"],"confidence":"Medium","gaps":["Direction of causality between SNPs and behavior in humans correlational","Receptor-level mechanism not defined"]},{"year":2015,"claim":"Linked an alcohol-dependence risk allele (rs279858*C) to reduced GABRA2 expression in a developmental cell model and showed co-regulation with neighboring 4p12 GABAA subunit genes, while noting absence of the effect in adult cortex.","evidence":"iPSC-derived neural cultures from genotyped donors with qPCR/RNA-seq plus postmortem brain datasets","pmids":["26250693"],"confidence":"Medium","gaps":["Developmental-stage dependence of the eQTL not mechanistically explained","Causal variant within the haplotype not isolated"]},{"year":2016,"claim":"Dissociated the benzodiazepine, neurosteroid, and ethanol-sensitivity sites on α2 in vivo, assigning each to specific residues controlling distinct alcohol-drinking phenotypes.","evidence":"Gabra2 point-mutant knock-in mice (H101R, Q241M, S270H/L277A) across multiple drinking and social paradigms with pharmacological rescue","pmids":["27717041"],"confidence":"High","gaps":["Circuit-level loci of each pharmacological action not mapped","Translation to human polymorphic sites not established"]},{"year":2018,"claim":"Identified a gain-of-function disease mechanism, showing a de novo variant produces constitutively open channels causing early-onset epilepsy.","evidence":"Whole-cell patch-clamp of mutant α2/β/γ receptors expressed in HEK293T cells with mutagenesis (p.T292K)","pmids":["29961870"],"confidence":"High","gaps":["In vivo neuronal consequences of tonic opening not modeled","Generality across other epilepsy variants not tested here"]},{"year":2018,"claim":"Connected β-endorphin signaling to sexually dimorphic limbic Gabra2 regulation during binge drinking, identifying an upstream neuropeptide modulator.","evidence":"Drinking-in-the-dark model in β-endorphin KO vs WT mice with regional qRT-PCR","pmids":["30555510"],"confidence":"Medium","gaps":["Direct mechanism linking β-endorphin to Gabra2 transcription unknown","Behavioral relevance of the expression change not tested"]},{"year":2020,"claim":"Defined a physical regulator of α2 trafficking, showing FRMD7 binds the α2 intracellular loop and that disease mutations reduce binding and impair receptor mobility.","evidence":"GST pull-down, Co-IP, immunofluorescence, and FRAP in C. elegans frm-3 null with rescue","pmids":["32446246"],"confidence":"Medium","gaps":["Mechanism of FRMD7-dependent transport not resolved","Mammalian validation of trafficking role pending"]},{"year":2020,"claim":"Mapped pathogenic missense variants onto receptor structure, placing them near gates and inter-subunit interfaces and aligning with other Cys-loop epilepsy variants.","evidence":"Trio whole-genome sequencing with structural modeling and conservation analysis (no functional assay)","pmids":["32347641"],"confidence":"Low","gaps":["Computational only — no electrophysiology performed","Predicted gating effects of each variant unverified"]},{"year":2021,"claim":"Validated a hypomorphic intronic deletion as a causal genetic modifier of epilepsy by demonstrating CRISPR correction restores synaptic α2 and rescues seizure phenotypes.","evidence":"Quantitative receptor abundance measurement, CRISPR/Cas9 allele correction, and seizure/survival analysis in Scn1a+/− mice","pmids":["34086081","35047853"],"confidence":"High","gaps":["Human relevance of the mouse-specific deletion uncertain","Mechanism by which the intronic indel reduces expression not fully detailed"]},{"year":2021,"claim":"Showed the same intronic variant is a quantitative trait variant for methamphetamine-induced locomotion, generalizing its functional impact to psychostimulant response.","evidence":"QTL mapping in Reduced Complexity Cross mice with cis-eQTL analysis and CRISPR correction plus locomotor assay","pmids":["34677900"],"confidence":"High","gaps":["Circuit mediating altered stimulant sensitivity not identified","Relationship to human stimulant traits untested"]},{"year":2024,"claim":"Revealed a distinct disease mechanism for an extracellular-domain variant, showing impaired co-assembly with partner subunits without mislocalization.","evidence":"Trio whole-exome sequencing, structural modeling, Western blot, Co-IP with GABRB3/GABRG2, and immunofluorescence in HEK293T (p.A308V)","pmids":["39737842"],"confidence":"Medium","gaps":["No electrophysiology to define channel functional consequence","Single Co-IP-based assembly assessment without quantitative stoichiometry"]},{"year":null,"claim":"It remains unresolved how α2 subunit expression level, subcellular trafficking, and gating are integrated at native synapses to set inhibitory tone, and how the diverse human risk and pathogenic variants map onto specific circuit-level phenotypes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No native-synapse functional model linking expression dosage to inhibition","Circuit-specific contributions of α2 to anxiety, addiction, and seizure phenotypes not dissected","Human FRMD7-GABRA2 trafficking axis not functionally validated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,9,14]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15]}],"complexes":["GABAA receptor"],"partners":["GABRB3","GABRG2","FRMD7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P47869","full_name":"Gamma-aminobutyric acid receptor subunit alpha-2","aliases":["GABA(A) receptor subunit alpha-2","GABAAR subunit alpha-2"],"length_aa":451,"mass_kda":51.3,"function":"Alpha subunit of the heteropentameric ligand-gated chloride channel gated by gamma-aminobutyric acid (GABA), a major inhibitory neurotransmitter in the brain (PubMed:10449790, PubMed:29961870, PubMed:31032849). GABA-gated chloride channels, also named GABA(A) receptors (GABAAR), consist of five subunits arranged around a central pore and contain GABA active binding site(s) located at the alpha and beta subunit interfaces (By similarity). When activated by GABA, GABAARs selectively allow the flow of chloride anions across the cell membrane down their electrochemical gradient (PubMed:10449790). Chloride influx into the postsynaptic neuron following GABAAR opening decreases the neuron ability to generate a new action potential, thereby reducing nerve transmission (By similarity). The alpha-2 subunit exhibits synaptogenic activity together with beta-2 and very little to no activity together with beta-3, the gamma-2 subunit being necessary but not sufficient to induce rapid synaptic contacts formation (By similarity)","subcellular_location":"Postsynaptic cell membrane; Cell membrane; Cytoplasmic vesicle membrane; Cell projection, dendrite","url":"https://www.uniprot.org/uniprotkb/P47869/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GABRA2","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/GABRA2","total_profiled":1310},"omim":[{"mim_id":"621120","title":"DELTA-LIKE NONCANONICAL NOTCH LIGAND 2; DLK2","url":"https://www.omim.org/entry/621120"},{"mim_id":"618559","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 79; DEE79","url":"https://www.omim.org/entry/618559"},{"mim_id":"618557","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 78; DEE78","url":"https://www.omim.org/entry/618557"},{"mim_id":"612820","title":"NEUROPLASTIN; NPTN","url":"https://www.omim.org/entry/612820"},{"mim_id":"600232","title":"GAMMA-AMINOBUTYRIC ACID RECEPTOR, BETA-2; GABRB2","url":"https://www.omim.org/entry/600232"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":37.3}],"url":"https://www.proteinatlas.org/search/GABRA2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P47869","domains":[{"cath_id":"2.70.170.10","chopping":"65-248","consensus_level":"high","plddt":93.5701,"start":65,"end":248},{"cath_id":"1.20.58.390","chopping":"251-340_417-441","consensus_level":"high","plddt":93.3749,"start":251,"end":441}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P47869","model_url":"https://alphafold.ebi.ac.uk/files/AF-P47869-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P47869-F1-predicted_aligned_error_v6.png","plddt_mean":83.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GABRA2","jax_strain_url":"https://www.jax.org/strain/search?query=GABRA2"},"sequence":{"accession":"P47869","fasta_url":"https://rest.uniprot.org/uniprotkb/P47869.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P47869/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P47869"}},"corpus_meta":[{"pmid":"15024690","id":"PMC_15024690","title":"Variations in GABRA2, encoding the alpha 2 subunit of the GABA(A) receptor, are associated with alcohol dependence and with brain oscillations.","date":"2004","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15024690","citation_count":498,"is_preprint":false},{"pmid":"15274050","id":"PMC_15274050","title":"Allelic and haplotypic association of GABRA2 with alcohol dependence.","date":"2004","source":"American journal of medical genetics. 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mutagenesis\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with electrophysiological recording and specific variant characterization in a single rigorous study\",\n      \"pmids\": [\"29961870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Targeted deletion of the GABRA2 gene (α2-subunit knockout mice) abolishes the anxiolytic effects of both benzodiazepines (diazepam) and barbiturates (pentobarbital) in a conditioned emotional response task, demonstrating that α2-containing GABAA receptors mediate anxiolytic effects of both drug classes and are involved in circuits underlying conditioned anxiety.\",\n      \"method\": \"Genetic knockout (α2 KO mice) with conditioned emotional response behavioral testing; pharmacological challenge with diazepam and pentobarbital\",\n      \"journal\": \"Pharmacology, biochemistry, and behavior\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined behavioral phenotype and pharmacological dissection, single lab but multiple drug classes tested\",\n      \"pmids\": [\"18313124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Deletion of GABRA2 (α2-subunit KO mice) increases hypersensitivity to the acute sedative and ataxic effects of ethanol (shorter latency to fall on rotarod, prolonged loss of righting reflex) without altering blood ethanol concentrations, indicating a protective role for α2-subunits against acute ethanol effects; ethanol self-administration was unchanged in KO mice.\",\n      \"method\": \"Genetic knockout mice; rotarod, wire hang, and loss-of-righting-reflex assays; blood ethanol concentration measurement; operant ethanol self-administration\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple orthogonal behavioral readouts and pharmacokinetic controls ruling out metabolic confounds, single lab\",\n      \"pmids\": [\"23115637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Point mutations in Gabra2 reveal distinct functional roles of specific residues: BZD-insensitive (H101R) α2-containing receptors lead to escalated binge-like drinking; Q241M substitution (blocking neuroactive steroid modulation) blunts chronic escalated alcohol intake; S270H/L277A substitution (reducing high-concentration ethanol sensitivity) results in excessive alcohol consumption and abolishes forced-abstinence-induced social deficits.\",\n      \"method\": \"Gabra2 point-mutant knockin mice; drinking-in-the-dark, continuous access, and intermittent access alcohol protocols; social approach assays; pharmacological rescue with allopregnanolone and midazolam\",\n      \"journal\": \"Alcoholism, clinical and experimental research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple distinct point mutations with specific ligand-binding site assignments tested across multiple alcohol drinking paradigms in a single study\",\n      \"pmids\": [\"27717041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A hypomorphic intronic deletion in Gabra2 in C57BL/6J mice reduces α2 subunit mRNA and protein by ~50% and lowers the abundance of α2-containing GABAA receptors in hippocampal synapses; CRISPR/Cas9 correction of this deletion restores Gabra2 expression, increases α2-containing receptor abundance at hippocampal synapses, and rescues epilepsy phenotypes (seizure onset and survival) in Scn1a+/− Dravet syndrome mice, validating Gabra2 as a genetic modifier of Dravet syndrome.\",\n      \"method\": \"Quantitative measurement of GABAA receptor subunit abundance; CRISPR/Cas9 allele correction; Scn1a+/− mouse model; seizure monitoring and survival analysis\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — CRISPR repair of specific variant with direct measurement of protein abundance and functional rescue replicated across two papers (PMID 34086081, 35047853)\",\n      \"pmids\": [\"34086081\", \"35047853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A functional intronic indel in Gabra2 on the C57BL/6J background underlies a QTL for methamphetamine-induced locomotor activity; CRISPR/Cas9 correction of this deletion reduces methamphetamine stimulant sensitivity, validating this variant as a quantitative trait variant (QTV) affecting psychostimulant response.\",\n      \"method\": \"Genome-wide QTL analysis in Reduced Complexity Cross mice; cis-eQTL mapping; CRISPR/Cas9 allele correction; locomotor activity assay after methamphetamine\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — QTL mapping converging on specific variant, confirmed by CRISPR correction with direct functional readout, single lab\",\n      \"pmids\": [\"34677900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The human GABRA2 gene produces multiple mRNA isoforms via alternative splicing and alternative promoter usage; four major isoforms arise from two alternative 5′ and two alternative 3′ exons, plus minor isoforms lacking exon 4 or 8. Two alternative 5′ exons each lie downstream of a functional promoter, and naturally occurring haplotypes differ in promoter activity, indicating genetic regulation of GABRA2 expression.\",\n      \"method\": \"RT-PCR and DNA sequencing of human brain mRNA; transient transfection promoter activity assays with naturally occurring haplotype constructs\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct promoter activity assay with haplotype constructs plus mRNA isoform characterization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15950776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The rat Gabra2 gene 5′-flanking region contains three alternative first exons each preceded by a functional promoter (two lacking TATA/CCAAT elements), generating six 5′-UTR isoforms by alternative splicing; differential activation of these alternative promoters occurs during brain development, and diversity at the 5′-end of transcripts affects GABAA receptor expression.\",\n      \"method\": \"cDNA/genomic DNA alignment, identification of transcription initiation sites, promoter functional characterization; developmental expression analysis\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter characterization with developmental context and functional impact on receptor expression, single lab\",\n      \"pmids\": [\"12354299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The alcohol dependence-associated GABRA2 rs279858*C allele is associated with significantly lower GABRA2 mRNA levels in human iPSC-derived neural cell cultures, and expression of GABRA2 is correlated with expression of the other three chromosome 4p12 GABAA subunit genes (GABRG1, GABRA4, GABRB1) but not other neural genes; this genotype effect was absent in postmortem adult cortex.\",\n      \"method\": \"iPSC-derived neural cell cultures from rs279858-genotyped donors; qPCR and RNA-seq; BrainCloud and BRAINEAC postmortem brain datasets\",\n      \"journal\": \"Alcoholism, clinical and experimental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal gene expression methods in iPSC model plus negative replication in adult brain, single lab\",\n      \"pmids\": [\"26250693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FRMD7 directly interacts with the intracellular loop between transmembrane domains 3 and 4 of GABRA2; INS-causing FRMD7 missense mutations (p.Ala194Thr and p.Arg325Gly) exhibit decreased binding to GABRA2, and loss of frm-3 (FRMD7 homolog) in C. elegans impairs GABAA receptor fluorescence recovery after photobleaching, indicating FRMD7 regulates GABAAR transport/localization through GABRA2 interaction.\",\n      \"method\": \"GST pull-down and co-immunoprecipitation; Western blotting; immunofluorescence; FRAP in C. elegans frm-3 null background with rescue assays\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pull-down and Co-IP with in vivo FRAP validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"32446246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Structural analysis of seven pathogenic GABRA2 missense variants associated with early infantile epileptic encephalopathy localizes them to the transmembrane domain near the desensitization gate, activation gate, or inter-subunit interfaces; equivalent positions are mutated in other Cys-loop receptor epilepsy variants, and pathogenic mutations are enriched in the pore-lining helix.\",\n      \"method\": \"Trio whole-genome sequencing; protein structural modeling; evolutionary sequence conservation analysis\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational structural analysis only, no functional assay performed in this paper\",\n      \"pmids\": [\"32347641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In mice, deletion of GABRA2 (α2−/− mice) abolishes methylphenidate's ability to facilitate responding for conditioned reinforcers, paralleling human findings where carriers of GABRA2 addiction-risk SNPs are insensitive to methylphenidate-facilitated conditioned reinforcement and mood effects, suggesting α2-containing GABAA receptor circuits protect against addiction vulnerability.\",\n      \"method\": \"α2 knockout mice; operant conditioned reinforcement task with methylphenidate; parallel human SNP genotype × methylphenidate randomized crossover study\",\n      \"journal\": \"Frontiers in behavioral neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — parallel mouse KO and human pharmacogenetic experiment, single lab, two species\",\n      \"pmids\": [\"26635556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Exercise increases Gabra2 mRNA expression in the limbic system of aged mice while decreasing it in young mice; the repressive histone mark H3K9me3 at the GABRA2 promoter region decreases with age, and SUV39H1 inhibition (ETP69) reduces H3K9me3 at GABRA2 and BDNF promoters, indicating that H3K9me3-mediated epigenetic regulation modulates GABRA2 expression in an age-dependent manner.\",\n      \"method\": \"Exercise intervention in mice; ChIP for H3K9me3 at GABRA2 promoter; qRT-PCR; pharmacological inhibition of SUV39H1 with ETP69\",\n      \"journal\": \"Frontiers in aging neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus qRT-PCR with pharmacological intervention, single lab, multiple conditions\",\n      \"pmids\": [\"34970138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Binge ethanol consumption reduces Gabra2 mRNA in the central nucleus of the amygdala and bed nucleus of the stria terminalis in female wild-type mice; this reduction is reversed in β-endorphin-deficient female mice (where EtOH instead increases Gabra2 to wild-type naïve levels), demonstrating that β-endorphin modulates sexually dimorphic Gabra2 expression in limbic structures during binge drinking.\",\n      \"method\": \"Drinking-in-the-dark binge model in β-endorphin knockout and wild-type mice; qRT-PCR of Gabra2 mRNA in dissected limbic regions\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model with regional brain mRNA quantification across sex and genotype, single lab\",\n      \"pmids\": [\"30555510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A novel de novo GABRA2 missense variant (p.Ala308Val) in the extracellular domain reduces protein expression, impairs co-immunoprecipitation interaction with GABRB3 and GABRG2 subunits (potentially destabilizing the pentameric receptor complex), but does not alter subcellular localization of the mutant protein.\",\n      \"method\": \"Trio whole-exome sequencing; structural modeling; Western blotting; co-immunoprecipitation; immunofluorescence in HEK293T cells\",\n      \"journal\": \"Annals of clinical and translational neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus WB and IF in a single study, single lab, no electrophysiology\",\n      \"pmids\": [\"39737842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In a zebrafish gabra2 morphant model, knockdown of gabra2 disrupts the pattern of cell proliferation during embryonic CNS development, increases apoptosis in mid- and hindbrain, reduces expression of notch1, pax2, fgf8, wnt1, and gad1b, and downregulates neuroD transcriptional activity, indicating that gabra2 plays a role in CNS development including neuronal differentiation and GABAergic circuit formation.\",\n      \"method\": \"Morpholino knockdown in zebrafish; BrdU proliferation assay; TUNEL apoptosis assay; in situ hybridization and gene expression analysis\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in zebrafish with multiple orthogonal developmental readouts, single lab\",\n      \"pmids\": [\"29124181\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GABRA2 encodes the α2 subunit of the GABAA receptor, a ligand-gated chloride channel; α2-containing receptors mediate the anxiolytic effects of benzodiazepines and barbiturates, modulate the acute sedative/ataxic and stimulant responses to ethanol, regulate conditioned reinforcement by psychostimulants, and control neuronal inhibition such that pathogenic missense variants cause tonic channel opening or altered GABA sensitivity leading to early-onset epileptic encephalopathy; expression of the gene is regulated by alternative promoters and splicing, by H3K9me3 epigenetic marks at the promoter, and by β-endorphin signaling in limbic circuits, while a hypomorphic intronic deletion that reduces α2 protein levels at hippocampal synapses acts as a genetic modifier of seizure severity in Dravet syndrome and SCN8A encephalopathy mouse models.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GABRA2 encodes the α2 subunit of the GABAA receptor, a pentameric ligand-gated chloride channel, and α2-containing receptors govern distinct facets of neuronal inhibition, drug response, and neurodevelopment [#0, #1]. In assembled receptors the α2 subunit physically partners with β and γ subunits (GABRB3, GABRG2), and a de novo extracellular-domain variant (p.A308V) that weakens co-assembly with these subunits destabilizes the pentamer and reduces channel expression [#14]. De novo missense variants concentrate in the transmembrane domain near the activation and desensitization gates and inter-subunit interfaces, producing gain-of-function channels: the p.T292K variant yields receptors that open tonically in the absence of GABA, driving early-onset epileptic encephalopathy [#0, #10]. Genetically, α2-containing receptors mediate the anxiolytic actions of benzodiazepines and barbiturates and shape responses to ethanol and psychostimulants; knockout mice lose benzodiazepine/barbiturate anxiolysis, show heightened acute ethanol sensitivity, and fail to support methylphenidate-facilitated conditioned reinforcement, while residue-specific knock-in mutations dissociate benzodiazepine-site, neurosteroid-site, and ethanol-sensitivity contributions to escalated alcohol drinking [#1, #2, #3, #11]. GABRA2 expression is set by alternative 5′ promoters and splicing, by H3K9me3 marks at the promoter, and by β-endorphin signaling in limbic regions, and a hypomorphic intronic deletion that lowers synaptic α2 abundance acts as a genetic modifier of seizure severity and psychostimulant response, with CRISPR correction restoring expression and rescuing phenotypes [#4, #5, #6, #12, #13]. The α2 intracellular TM3–TM4 loop binds FRMD7, which regulates receptor transport/localization, and gabra2 knockdown in zebrafish perturbs CNS proliferation, apoptosis, and patterning gene expression, implicating the subunit in neurodevelopment beyond synaptic inhibition [#9, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established that Gabra2 transcription is governed by multiple alternative promoters and developmentally regulated 5′-exon usage, defining a layer of expression control independent of coding sequence.\",\n      \"evidence\": \"cDNA/genomic alignment, transcription start site mapping, and promoter functional characterization in rat with developmental expression analysis\",\n      \"pmids\": [\"12354299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trans-acting factors driving the alternative promoters not identified\", \"Functional consequence of each 5′-UTR isoform on translation not quantified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended promoter/splicing regulation to humans and linked it to natural genetic variation, showing haplotypes differ in promoter activity and thus could underlie GABRA2 disease associations.\",\n      \"evidence\": \"RT-PCR/sequencing of human brain mRNA plus transient transfection promoter assays with haplotype constructs\",\n      \"pmids\": [\"15950776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal haplotype variants not pinpointed\", \"In vivo brain expression differences between haplotypes not measured\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Answered which GABAA receptor subunit mediates benzodiazepine and barbiturate anxiolysis, assigning both to α2-containing receptors.\",\n      \"evidence\": \"α2 knockout mice in a conditioned emotional response task with diazepam and pentobarbital challenge\",\n      \"pmids\": [\"18313124\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific brain circuits/cell types responsible not localized\", \"Does not distinguish synaptic vs extrasynaptic α2 contribution\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Determined α2's role in acute ethanol responses, showing it protects against sedative/ataxic effects without governing self-administration or ethanol metabolism.\",\n      \"evidence\": \"α2 KO mice with rotarod, loss-of-righting-reflex, blood ethanol, and operant self-administration assays\",\n      \"pmids\": [\"23115637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which α2 limits acute ethanol effects unresolved\", \"Compensatory changes in other subunits in KO not excluded\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved how α2 circuits contribute to addiction vulnerability via conditioned reinforcement, with concordant mouse and human pharmacogenetic data on methylphenidate.\",\n      \"evidence\": \"α2 KO mice in conditioned-reinforcement task plus parallel human SNP × methylphenidate crossover study\",\n      \"pmids\": [\"26635556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direction of causality between SNPs and behavior in humans correlational\", \"Receptor-level mechanism not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked an alcohol-dependence risk allele (rs279858*C) to reduced GABRA2 expression in a developmental cell model and showed co-regulation with neighboring 4p12 GABAA subunit genes, while noting absence of the effect in adult cortex.\",\n      \"evidence\": \"iPSC-derived neural cultures from genotyped donors with qPCR/RNA-seq plus postmortem brain datasets\",\n      \"pmids\": [\"26250693\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Developmental-stage dependence of the eQTL not mechanistically explained\", \"Causal variant within the haplotype not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Dissociated the benzodiazepine, neurosteroid, and ethanol-sensitivity sites on α2 in vivo, assigning each to specific residues controlling distinct alcohol-drinking phenotypes.\",\n      \"evidence\": \"Gabra2 point-mutant knock-in mice (H101R, Q241M, S270H/L277A) across multiple drinking and social paradigms with pharmacological rescue\",\n      \"pmids\": [\"27717041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Circuit-level loci of each pharmacological action not mapped\", \"Translation to human polymorphic sites not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a gain-of-function disease mechanism, showing a de novo variant produces constitutively open channels causing early-onset epilepsy.\",\n      \"evidence\": \"Whole-cell patch-clamp of mutant α2/β/γ receptors expressed in HEK293T cells with mutagenesis (p.T292K)\",\n      \"pmids\": [\"29961870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo neuronal consequences of tonic opening not modeled\", \"Generality across other epilepsy variants not tested here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected β-endorphin signaling to sexually dimorphic limbic Gabra2 regulation during binge drinking, identifying an upstream neuropeptide modulator.\",\n      \"evidence\": \"Drinking-in-the-dark model in β-endorphin KO vs WT mice with regional qRT-PCR\",\n      \"pmids\": [\"30555510\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism linking β-endorphin to Gabra2 transcription unknown\", \"Behavioral relevance of the expression change not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a physical regulator of α2 trafficking, showing FRMD7 binds the α2 intracellular loop and that disease mutations reduce binding and impair receptor mobility.\",\n      \"evidence\": \"GST pull-down, Co-IP, immunofluorescence, and FRAP in C. elegans frm-3 null with rescue\",\n      \"pmids\": [\"32446246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of FRMD7-dependent transport not resolved\", \"Mammalian validation of trafficking role pending\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapped pathogenic missense variants onto receptor structure, placing them near gates and inter-subunit interfaces and aligning with other Cys-loop epilepsy variants.\",\n      \"evidence\": \"Trio whole-genome sequencing with structural modeling and conservation analysis (no functional assay)\",\n      \"pmids\": [\"32347641\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Computational only — no electrophysiology performed\", \"Predicted gating effects of each variant unverified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Validated a hypomorphic intronic deletion as a causal genetic modifier of epilepsy by demonstrating CRISPR correction restores synaptic α2 and rescues seizure phenotypes.\",\n      \"evidence\": \"Quantitative receptor abundance measurement, CRISPR/Cas9 allele correction, and seizure/survival analysis in Scn1a+/− mice\",\n      \"pmids\": [\"34086081\", \"35047853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human relevance of the mouse-specific deletion uncertain\", \"Mechanism by which the intronic indel reduces expression not fully detailed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed the same intronic variant is a quantitative trait variant for methamphetamine-induced locomotion, generalizing its functional impact to psychostimulant response.\",\n      \"evidence\": \"QTL mapping in Reduced Complexity Cross mice with cis-eQTL analysis and CRISPR correction plus locomotor assay\",\n      \"pmids\": [\"34677900\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Circuit mediating altered stimulant sensitivity not identified\", \"Relationship to human stimulant traits untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a distinct disease mechanism for an extracellular-domain variant, showing impaired co-assembly with partner subunits without mislocalization.\",\n      \"evidence\": \"Trio whole-exome sequencing, structural modeling, Western blot, Co-IP with GABRB3/GABRG2, and immunofluorescence in HEK293T (p.A308V)\",\n      \"pmids\": [\"39737842\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No electrophysiology to define channel functional consequence\", \"Single Co-IP-based assembly assessment without quantitative stoichiometry\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how α2 subunit expression level, subcellular trafficking, and gating are integrated at native synapses to set inhibitory tone, and how the diverse human risk and pathogenic variants map onto specific circuit-level phenotypes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No native-synapse functional model linking expression dosage to inhibition\", \"Circuit-specific contributions of α2 to anxiety, addiction, and seizure phenotypes not dissected\", \"Human FRMD7-GABRA2 trafficking axis not functionally validated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 9, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [\"GABAA receptor\"],\n    \"partners\": [\"GABRB3\", \"GABRG2\", \"FRMD7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}