Enables gamma-aminobutyric acid:sodium symporter activity and identical protein binding activity. Involved in several processes, including gamma-aminobutyric acid import; negative regulation of GABAergic synaptic transmission; and positive regulation of gamma-aminobutyric acid secretion. Located in cell surface; neuron projection; and plasma membrane. Is active in GABA-ergic synapse. Is integral component of postsynaptic membrane and integral component of presynaptic membrane. Used to study brain ischemia. Biomarker of cerebral infarction; epilepsy; temporal lobe epilepsy; and withdrawal disorder. Orthologous to human SLC6A1 (solute carrier family 6 member 1). [provided by Alliance of Genome Resources, Apr 2022]