RESUMO
Objectives To investigate the relationship between the insertion and deletion (I/D) polymorphism of human angiotensin converting enzyme (ACE) gene and the vascular complications in type 2 diabetes. Methods The I/D polymorphism of ACE gene was detected by polymerase chain reaction in 120 type 2 diabetic patients and 100 healthy controls. Results The frequency of DD genotype was significantly higher, while frequency of II genotype was lower in diabetic nephropathy patients (DN) than those in control group. The frequency of ID genotype was significantly higher, while frequency of II genotype was lower in type 2 diabetic patients with coronary heart disease (CHD), when compared to those without CHD. The frequencies of ACE genotypes in patients with diabetic retinopathy (DR) or hypertension (HP) were not different from those in control group and non-DR or non- HP patients. Conclusions ① There were relationships between the I/D polymorphism of ACE gene and DN and CHD in type 2 diabetes. ② The DD genotype and D allele of ACE gene might be as markers in predisposing DN, while II genotype and I allele as protective factors for DN in diabetes. The ID genotype might be as a marker in predisposing CHD, while II genotype as a protective factor for CHD in diabetes.③ There was no relationship between I/D polymorphism of ACE gene and HP or DR in diabetes in Guangxi region.