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A major goal in our laboratory is to understand the role of common genetic variations among individual patients as regards susceptibility to common diseases and differences in therapeutic efficacy and/or side effects of drugs. As an addition to the high-density SNP (single-nucleotide polymorphism) maps of 12 glutathione S-transferase and related genes reported earlier, we provide here an SNP map of the microsomal glutathione S-transferase 1 (MGST1) gene. Among 48 healthy Japanese volunteers examined. we identified a total of 46 SNPs at this locus, 36 of which had not been reported before: 4 in the promoter region, 34 in introns, 3 in the 3' untranslated region, and 5 in the 3' flanking region. No SNP was found in 5'untranslated or coding regions. The ratio of transition to transversion was approximately 1.2:1. Among the 13 insertion-deletion polymorphisms was a 2-bp deletion in the coding region of MGST1 in DNA from one of the volunteers, which resulted in a frame-shift mutation. Since the gene product encoded by this mutant allele would lack the C-terminal half including the MAPEG (membrane-associated proteins in eicosanoid and glutathione metabolism) domain, MGST1 activity is likely to be reduced in the carrier's cells. The SNP map presented here adds to the archive of tools for studying complex genetic diseases, population migration patterns, and a variety of pharmacogenetic possibilities.

Catalog of 46 single-nucleotide polymorphisms (SNPs) in the microsomal glutathione S-transferase 1 (MGST1) gene