Gamma-aminobutyric acid type A receptor subunit gamma-1 (GABRG1)

Gamma-aminobutyric acid type A receptor subunit gamma-1 (GABRG1) is a transmembrane protein belonging to the ligand-gated ion channel superfamily and specifically the GABA(A) receptor family[4][1]. GABA(A) receptors are pentameric chloride ion channels, usually composed of combinations of α, β, and γ subunits, that mediate the fast inhibitory effects of gamma-aminobutyric acid (GABA) in the central nervous system[3][2]. The gamma-1 subunit is one of three gamma subunit isoforms encoded in humans and contributes to receptor diversity, which in turn influences pharmacological profiles and localization within the brain[3]. GABRG1 forms part of the heteropentameric structure required for functional GABA(A) receptor expression at postsynaptic membranes, facilitating chloride influx upon GABA binding, resulting in neuronal hyperpolarization and decreased excitability[4][2][1]. Disorders associated with GABRG1 include neurological and psychiatric conditions such as epilepsy, schizophrenia, autism spectrum disorder, and alcohol dependence[2][3]. The receptor is also the site of action for various clinically important drugs, including benzodiazepines and barbiturates, which modulate its function to produce anxiolytic, anticonvulsant, and sedative effects[3][2].

Other names

Gamma-aminobutyric acid receptor subunit gamma-1GABAAR subunit gamma-1GABA(A) receptor subunit gamma-1GABA(A) receptor, gammagamma-aminobutyric acid (GABA) A receptor, gamma 1GABA(A) receptor subunit gamma1gamma-1 polypeptide

Positive allosteric modulation (by benzodiazepines and barbiturates binding to allosteric sites) Direct agonism (by GABA and muscimol at orthosteric GABA-binding site) Antagonism (by bicuculline at GABA-binding site) Channel blockade (by picrotoxin and similar agents)