GENE POLYMORPHISMS OF THE RENIN-ANGIOTENSIN SYSTEM IN RELATION TO HYPERTENSION AND PARENTAL HISTORY OF MYOCARDIAL-INFARCTION AND STROKE - THE PEGASE STUDY
L. Tiret et al., GENE POLYMORPHISMS OF THE RENIN-ANGIOTENSIN SYSTEM IN RELATION TO HYPERTENSION AND PARENTAL HISTORY OF MYOCARDIAL-INFARCTION AND STROKE - THE PEGASE STUDY, Journal of hypertension, 16(1), 1998, pp. 37-44
Objective To investigate a possible involvement of polymorphisms of th
e renin-angiotensin system in predisposition to moderate and severe hy
pertension and their relationship to parental histories of myocardial
infarction and stroke. Methods Hypertensive cases (453 men, 326 women)
were patients followed up by general practitioners for established hy
pertension. Inclusion criteria were an age of onset of hypertension le
ss than or equal to 60 years and a diastolic blood pressure greater th
an or equal to 105 mmHg without antihypertensive medication or greater
than or equal to 100 mmHg under treatment. Normotensive controls were
selected from population-based samples (362 men) and during a prevent
ative medicine visit (170 women). Polymorphisms of the angiotensinogen
gene (AGT M235T and T174M), the angiotensin I converting enzyme gene
(ACE I/D), and the angiotensin II type 1 receptor gene (AGT(1)R A1166C
) were investigated. Results The AGTT235 allele prevalence was higher
among male hypertensive cases than it was among controls (0.46 versus
0.40, P = 0.01) and a similar trend was observed with female cases who
se hypertension had been diagnosed before they were aged 45 years (0.4
4 versus 0.38, P = 0.20). The AGT(1)R C1166 allele prevalence was high
er among female hypertensives than it was among controls (0.30 versus
0.23, P = 0.03) but no such difference was observed for men. The AGT T
174M and ACE I/D polymorphisms were not associated with hypertension.
Hypertensive patients reporting a parental history of myocardial infar
ction before age 60 years had a higher prevalence of the ACE D allele
than did those without such a parental history (0.68 versus 0.56, P =
0.01). The ACE D allele prevalence was also greater among patients rep
orting a parental history of stroke incidence before age 65 years (0.6
6 versus 0.57, P = 0.05). Conclusions These results support the hypoth
esis that the AGT gene plays a role in predisposition to hypertension
and that the ACE gene plays a role in predisposition to acute ischemic
events. (C) 1998 Rapid Science Publishers Ltd.