Gamma-aminobutyric acid receptor subunit alpha-4 (GABRA4)

Gamma-aminobutyric acid receptor subunit alpha-4 is one of six known alpha subunits comprising the GABA-A receptor family, which are the principal inhibitory ligand-gated chloride channels in the mammalian brain[2][1]. The GABRA4 gene encodes the alpha-4 subunit, which assembles with other subunits (typically β and δ, occasionally γ) to form pentameric GABA-A receptors with unique physiological and pharmacological profiles. Alpha-4-containing GABA-A receptors are typically found extrasynaptically, where they mediate tonic inhibition by responding to ambient GABA concentrations. These receptors have reduced sensitivity to benzodiazepines but are potently modulated by neurosteroids and certain anesthetics[2]. Dysfunction in alpha-4 subunit-containing GABA-A receptors has been implicated in epilepsy, anxiety, neurodevelopmental disorders, and cognitive dysfunction. The broad distribution and functional role of these receptors in neural inhibition make them important targets for several therapeutic agents and central to inhibitory signaling in the central nervous system[2][1].

Other names

GABA-A receptor subunit alpha-4GABAA receptor alpha-4GABRA4

Positive allosteric modulation (e.g., benzodiazepines, barbiturates, neurosteroids increase channel opening frequency/duration) - Direct agonism (GABA as endogenous ligand; gaboxadol as a drug acting at extrasynaptic sites) - Channel blockers/negative modulators reduce chloride conductance