GABRA2 encodes the alpha-2 subunit of GABA(A) receptors, ligand-gated chloride channels that mediate fast synaptic inhibition in the brain. When activated by GABA, the major inhibitory neurotransmitter, these receptors allow chloride influx into neurons, reducing their excitability and dampening nerve transmission. The alpha-2 subunit exhibits synaptogenic activity and is involved in rapid synaptic contact formation when paired with beta-2 and gamma-2 subunits. GABRA2 variants are robustly associated with alcohol use disorder risk across multiple populations and study designs 123. Specific variants show strong associations in subjects of European ancestry, with odds ratios of 1.18–1.25 3. Mutations in GABRA2 are also implicated in developmental and epileptic encephalopathy, with loss-of-function variants reducing GABA-evoked receptor potentials 4. Additionally, GABRA2 polymorphisms interact with environmental stressors in posttraumatic stress disorder susceptibility 5. The gene exhibits complex regulation through alternative splicing and promoter use, with genetic variation in these regulatory regions affecting expression levels 6. GABA(A) receptors are targets of benzodiazepines, barbiturates, and newer agents like brexanolone, which are used as anxiolytics, anticonvulsants, and alcohol-withdrawal treatments. Understanding GABRA2 variants may refine risk stratification for alcohol dependence and seizure disorders.