Gamma-aminobutyric acid type A receptor alpha-1 subunit-containing subtypes (GABA_A receptor α1) (GABA_A receptor α1)

The Gamma-aminobutyric acid type A (GABA_A) receptor alpha-1 subunit-containing subtype is a primary mediator of fast inhibitory neurotransmission in the central nervous system (UniProt P14867; StatPearls GABA Receptor). As a member of the Cys-loop family of ligand-gated ion channels, it typically forms a pentameric structure, most frequently composed of two alpha-1, two beta-2, and one gamma-2 subunit (Sigel & Steinmann, 2012, J Biol Chem). Upon binding the neurotransmitter GABA, the channel opens to allow chloride ions to flow into the neuron, causing hyperpolarization and decreasing the likelihood of an action potential (StatPearls GABA Receptor). This specific subtype is widely distributed throughout the brain and is particularly associated with the sedative, hypnotic, and anticonvulsant properties of various pharmacological agents (Rudolph & Knoflach, 2011, Nat Rev Drug Discov). Dysregulation or mutations in the alpha-1 subunit (GABRA1) are linked to neurological conditions such as juvenile myoclonic epilepsy and insomnia (NCBI Gene 2554). Drugs targeting this receptor, including benzodiazepines and non-benzodiazepine "Z-drugs" like zolpidem, act as positive allosteric modulators to enhance GABAergic inhibition (Rudolph & Knoflach, 2011). While effective for treating sleep and seizure disorders, targeting the alpha-1 subtype is also associated with side effects like ataxia and cognitive impairment.

Other names

GABRA1GABA(A) receptor subunit alpha-1Alpha-1 GABA-A receptorGABA(A) receptor alpha-1 subunit

Positive allosteric modulation of the GABA-induced chloride current at the benzodiazepine binding site located between the alpha-1 and gamma-2 subunits.