SLC6A1 and schizophrenia: Some findings also reported changes in the presynaptic side of GABA synapses, such as a decrease in mRNA levels of GABA transporter 1 (GAT1), a GABA membrane transporter responsible for the reuptake of released GABA into nerve terminals [55] or mRNA levels of the vesicular GABA transporter (vGAT) that loads GABA into presynaptic vesicles [53] in the PFC of schizophrenia subjects.