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Alpha-2-adrenergic receptor (ADRA2A) is involved in the sympathetic nervous system and plays a role in the regulation of insulin secretion and lipolysis. Recent studies have indicated that the ADRA2A polymorphisms are associated with type 2 diabetes (T2DM) in Caucasians and African Americans. The present study aimed to evaluate the association between the ADRA2A polymorphisms and T2DM in a Chinese Han population. Two single-nucleotide polymorphisms (SNPs) rs521674 and rs553668 in the ADRA2A gene were genotyped in 2094 Chinese subjects (1042 T2DM patients and 1052 nondiabetic controls) by using the TaqMan allelic discrimination technique. A single-locus analysis indicated that SNP rs553668 was associated with T2DM (p=0.04). Further analysis indicated that the association of SNP rs553668 was found in T2DM patients with body mass index (BMI)&lt;25 kg/m(2) (p=0.03), but not in the patients with BMI≥25 kg/m(2) (p=0.56). This association was still significant in a recessive model (p=0.01, odds ratio=0.68, 95% confidence interval=0.51-0.92). In conclusion, the present study provides evidence that the ADRA2A polymorphism, rs553668, is associated with lean T2DM patients in a Chinese Han population. Further investigation to explore the role of ADRA2A in the regulation of body weight has been taken into our consideration.

Evaluation of the Association Between the ADRA2A Genetic Polymorphisms and Type 2 Diabetes in a Chinese Han Population