Fig. 1

GABA transporter 1 (GAT-1) protein topology, mutations and identification of a novel SLC6A1 missense mutation GAT1(P361T). a. Schematic representation of GAT-1 protein topology and locations of GAT-1 variants previously identified in patients associated with a spectrum of epilepsy syndromes. It is predicted that GAT-1 contains 12 transmembrane domains. P361 is located at the extracellular loop between the 7th and 8th transmembrane helices of the GAT-1 protein. The positions of variants are based on the published LeuT crystal structure. b Pedigree and the genotype. A missense mutation was only found in the proband but not in the rest of the family members. c Chromatogram of PCR-Sanger sequencing. DNA sequences of the proband and the immediate family members were shown. Arrow indicated a C-to-A transversion. d Amino acid sequence homology shows that proline (P) at residue 361 is highly conserved in SCL6A1 in humans (Accession NO.NP_003033.3) and across species as shown in boxed region