Adiponectin Gene Variation -4522C/T Is Associated with Type 2 Diabetic Obesity and Insulin Resistance in Chinese

脂联素基因单核苷酸多态性与Ⅱ型糖尿病合并肥胖及胰岛素抵抗相关联(英文)

The authors investigated the possible association of -4522C/T variation of adiponectin gene with coronary heart disease （CHD） and type 2 diabetes mellitus （T2DM）. Genotyping of SNP --4522C/T in 304 patients with CHD, 389 patients with T2DM, and 405 age and sex-matched healthy control subjects was carried out by means of PCR-RFLP approach. No significant difference in the genotype or allele frequencies was found, either between patients with CHD and control subjects, or between patients with T2DM and control subjects. However, in the subgroup analysis, an association of the TAr genotype and T allele with type 2 diabetes combined with obesity （BMI ≥ 25 kg/m2） was found （P = 0.014 and P = 0.034, respectively）. Also the homeostasis model assessment of insulin resistance （HOMA-IR） in T2DM patients with T/T genotype was significantly higher than that in T2DM patients carrying C allele （P = 0.0069）. The authors＇ findings for the first time demonstrated that SNP --4522 in the adiponectin gene was associated with T2DM that combined with obesity and higher insulin resistance index in patients with T2DM. This indicated that the variation might associate with an increased susceptibility to type 2 diabetic obesity and insulin resistance. But -4522C/T polymorphism did not contribute to the susceptibility of CHD.

脂联素是近年新发现的脂肪组织特异性的细胞因子,其mRNA是脂肪组织中含量最丰富的基因转录产物,该因子可通过多种途径影响个体对胰岛素的敏感性。脂联素基因多态性与肥胖、胰岛素抵抗和2型糖尿病密切相关,而与冠心病相关性研究的报道较少。本研究以中国汉族人群1,098例为对象,其中304例冠心病(CHD)患者,389例糖尿病患者(T2DM),及405例性别年龄相匹配的正常对照,采用PCR-RFLP技术对脂联素基因-4522C/T进行基因分型,并分别对血脂水平、胰岛素抵抗、体重指数等临床数据进行分析比较。研究结果显示,脂联素基因-4522C/T各基因型及等位基因在CHD组与对照组、T2DM组与对照组中的分布差异无显著性;经分组分析发现,T2DM合并肥胖患者BMI≥25kg/m2TT基因型及T等位基因明显多于对照组,差异有显著性,P=0.014和P=0.034;TT基因型T2DM患者胰岛素抵抗指数(HOMA-IR)显著高于携带有C等位基因的T2DM患者,P=0.0069。本研究提示脂联素基因-4522C/T与中国汉族人群T2DM合并肥胖的发生及T2DM患者胰岛素抵抗相关,是引发糖尿病患者肥胖和胰岛素抵抗的重要候选基因,而与冠心病的发生无关联。