Sodium-dependent and chloride-dependent gamma-aminobutyric acid (GABA) transporter 1 (SLC6A1) is the target of a number of drugs of clinical importance and is a major determinant of synaptic GABA concentrations. We resequenced the human SLC6A1 gene previously and discovered a novel 21 bp insertion in the predicted promoter region that creates a second tandem copy of the sequence. Here we sought to determine the functional relevance of this variation.
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