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Background  The glutamatergic dysfunction hypothesis of schizophrenia suggests that genes involved in glutametergic transmission are candidates for schizophrenic susceptibility genes. We have been performing systematic association studies of schizophrenia with the glutamate receptor and transporter genes. In this study we report an association study of the excitatory amino acid transporter 2 gene,  SLC1A2  with schizophrenia.    Methods  We genotyped 100 Japanese schizophrenics and 100 controls recruited from the Kyushu area for 11 single nucleotide polymorphism (SNP) markers distributed in the  SLC1A2  region using the direct sequencing and pyrosequencing methods, and examined allele, genotype and haplotype association with schizophrenia.The positive finding observed in the Kyushu samples was re-examined using 100 Japanese schizophrenics and 100 controls recruited from the Aichi area.    Results  We found significant differences in genotype and allele frequencies of SNP2 between cases and controls ( P  = 0.013 and 0.008, respectively). After Bonferroni corrections, the two significant differences disappeared. We tested haplotype associations for all possible combinations of SNP pairs. SNP2 showed significant haplotype associations with the disease ( P  = 9.4 × 10 -5 ,  P  = 0.0052 with Bonferroni correction, at the lowest) in 8 combinations. Moreover, the significant haplotype association of SNP2-SNP7 was replicated in the cumulative analysis of our two sample sets.    Conclusion  We concluded that at least one susceptibility locus for schizophrenia is probably located within or nearby  SLC1A2  in the Japanese population.

Association study of polymorphisms in the excitatory amino acid transporter 2 gene (SLC1A2) with schizophrenia