[Association of the hepatic lipase gene -250G/A promoter polymorphism with the susceptibility to type 2 diabetes mellitus combining with coronary heart disease].

Objective To investigate the association of hepatic lipase-250G/A gene promoter polymorphism with type 2 diabetes mellitus combining with coronary heart disease. Methods Using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP), we detected the genotypes of the hepatic lipase gene promoter-250G/A, the effect of this polymorphism on plasma lipids, lipoproteins and apolipoproteins in 364 patients with type 2 diabetes mellitus and coronary heart disease (T2DM+CHD), 357 patients with type 2 diabetes mellitus alone(T2DM) and 356 healthy controls. Results The frequencies of alleles and genotypes in the T2DM group were not significantly different from that of controls. However, the AA and GA genotypes in the T2DM+CHD group were lower than those in controls (0.431vs 0.618, P=0.031). The frequencies of both allele and genotype were not related to gender, family history, smoking and BMI. When adjusted by factors such as gender, age, BMI, history of smoking, family history of coronary atherosclerosis and systemic hypertension, Spearman's correlation and linear regression analyses showed that the A allele is related positively to the levels of HDL-C and apoAl in T2DM and T2DM+CHD patients. However,logistic regression analysis showed that the A allele is one risk factor for the presence of coronary heart disease. Conclusion The hepatic lipase gene promoter-250G/A polymorphisms is associated with type 2 diabetes mellitus with coronary heart disease, its polymorphisms may affect the levels of HDL-C and apoAl. Key words: diabetes;  coronary heart disease;  genotype;  allele;  hepatic lipase