Genetic polymorphisms of GSTT1, GSTM1, and NQO1 genes and diabetes mellitus risk in Chinese population

ObjectiveThe aims of the present study were to assess whether the glutathione S-transferase T1 (GSTT1), M1 (GSTM1), and NAD(P)H: quinone oxidoreductase 1 (NQO1) genotypes are associated with type 2 diabetes mellitus (T2 DM) and to ascertain whether the levels of blood lipids given exposure to diabetes are modified by the specific genetic polymorphisms of GSTT1, GSTM1, and NQO1.MethodsThis case-control study was conducted on 200 subjects. The genotypes were determined using a polymerase chain reaction (PCR) and PCR-restriction fragment length polymorphism.ResultsThe GSTT1-present genotype conferred a statistically significant 0.49-fold reduction in risk of T2 DM relative to the null genotype. Individuals with GSTT1-null or GSTM1-null genotype had higher levels of low-density-lipoprotein cholesterol, apolipoprotein B, and lipoprotein(a), respectively. There was no association between either GSTM1 or NQO1 polymorphism and risk of T2 DM.ConclusionThe present results suggest that the GSTT1 gene may contribute to the development of T2 DM and may be one of the candidate genes of T2 DM in Chinese population.