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A genetic epidemiologic approach is useful to elucidate the genes responsible for hypertension. Genetic analyses of the components of the renin-angiotensin system have succeeded in showing an association between their polymorphism and hypertension. Recently, two types of angiotensin II receptor were cloned and characterized. To examine the genetic contribution of angiotensin II type 1 receptor (AT1) and type 2 receptor (AT2) genes in human essential hypertension, a case-control study was performed in Japanese subjects. The study comprised 321 subjects with hypertension who satisfied the criteria for essential hypertension, together with 215 age and sex matched controls. The significance of the differences in genotype distribution between hypertensive and normotensive subjects was examined by chi2 analysis. Neither AT1 nor AT2 gene variants were associated with human essential hypertension in the Japanese subjects. However, the AT1 receptor gene polymorphism was associated with left ventricular mass index in normotensive subjects. The study results suggest that gene polymorphisms of both angiotensin II receptors are not directly involved in the increase of genetic risk for hypertension, but that the AT1 receptor gene might contribute genetically to the increase of left ventricular mass.

Angiotensin II Type 1 Receptor Gene Polymorphism Is Associated With Increase of Left Ventricular Mass But Not With Hypertension