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The effect of polymorphisms of the RAS genes on the incidence of hypertension seems to be population-dependent. We studied the effects of the angiotensinogen T174M and M235T, angiotensin converting enzyme insertion/deletion (ACE I/D), and angiotensin II receptor 1 (AT1R) A1166C gene polymorphisms on the risk of hypertension among Hispanics. We selected all cases (n=256) and 257 age and sex group-matched controls from a random sample of free living Colombians (n=2,989). Logistic regression was used to estimate the independent effect of each polymorphism. All polymorphisms were in Hardy-Weinberg equilibrium in controls, with the exception of M235T, which showed a small excess of heterozygotes (p=0.005; disequilibrium coefficient, D=-0.0264). After adjustment for age, sex, body mass index, race, physical activity, family history of hypertension and cardiovascular disease, and other polymorphisms, subjects with the ACE DD genotype were 1.56 times (95% confidence interval [CI]: 1.05, 2.33) more likely to be hypertensive than carriers of the I allele (p=0.03). Also, adjusted systolic and diastolic blood pressure were 4.58 (95% CI: -0.39, 9.56) and 3.32 (95% CI: 0.78, 5.86) mmHg higher in DD homozygous individuals than in carriers of the I allele, respectively. Approximately 15% of the cases of hypertension in this population could be attributed to carriage of the DD genotype. None of the other polymorphisms was associated with either hypertension or blood pressure level. In conclusion, the ACE DD genotype appears to be an independent risk factor for development of hypertension and may explain a significant fraction of incident cases among Hispanics.

Population-Based Case-Control Study of Renin-Angiotensin System Genes Polymorphisms and Hypertension among Hispanics