Analysis of two variants of the angiotensinogen gene in essential hypertensive African-Americans

Two mutations (T174M and M235T) in the angiotensinogen gene have been reported to be associated with hypertension. This study examines the frequency of these mutations among African-American hypertensive patients (n = 109). The allele frequency of the T174M mutation was 4.6% and the frequency of the M235T mutation was 86.7%. The genotypic frequencies agreed with the conditioned Hardy-Weinberg predictions based on allele frequencies. The homozygote wild-type genotype at the T174 site was more frequent than the mutation and occurred at a rate of 91.7%. Conversely, the homozygote for the mutation at the M235 site was more frequent and occurred at a rate of 75.2%. Mutation frequencies for T174M and M235T in this African-American population differ from those previously reported from a white hypertensive population (P = .0058 and P = .0001, respectively). In summary, the representation of the angiotensinogen allele frequencies differ among hypertensive populations.