Abstract
Mitochondrial FAD-linked glycerophosphate dehydrogenase (mGPDH) is thought to be an important factor for glucose sensing in pancreatic beta cells. To evaluate the significance of the mGPDH gene in the development of non-insulin-dependent diabetes mellitus (NIDDM), we set up primers and conditions for polymerase chain reaction (PCR) amplification of the coding exons and flanking regions. Screening of 100 Japanese NIDDM patients for mutations using the PCR-single strand conformation polymorphism (SSCP) method revealed four variants (ACA:Thr243-ACG:Thr243, CAT:His264-CGT:Arg264, GCA:Ala305-GCC:Ala305, GCA:Ala 306-TCA:Ser306). The His264-Arg264 variant was found in 36 patients, while the other variants were found in only one patient each. Neither the genotypic (chi 2 = 3.15, p = 0.21) nor the allelic (chi 2 = 2.27, p = 0.13) frequency of the His264-Arg264 mutation differed between 253 Japanese NIDDM patients and 157 non-diabetic subjects. In addition, in NIDDM patients, neither the treatment modality nor body mass index differed between those with and without this mutation. These results suggest that inherited defects at this locus do not make a major contribution to genetic susceptibility to NIDDM in the Japanese population.
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