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Gi proteins mediate the intracellular effects of many vasoactive and proliferative stimuli. Recently such signaling was found to be enhanced in cultured cells of some hypertensive subjects. A polymorphism at position 825 (C--&gt;T) of the G protein beta3 subunit gene (GNB3) was strictly related to this phenotype. The aim of the present investigation was to test the association between this polymorphism and blood pressure and plasma renin levels in humans. A population-based sample (n=608) was analyzed by questionnaire and characterized for blood pressure; plasma renin, prorenin, and aldosterone levels; and Gbeta3 C825T allele status. In individuals without antihypertensive medication (n=474; age range, 52 to 67 years), the polymorphism was mildly associated with diastolic blood pressure (CC: 88.6+/-0.3 mm Hg, n=218; versus CT: 90.1+/-0.7 mm Hg, n=209; versus TT: 91.8+/-1.7 mm Hg, n=47; P=0.02 for trend) but not with systolic blood pressure. Furthermore, the 825T allele was also significantly associated with lower renin and prorenin levels, whereas the aldosterone to renin ratio was elevated in these subjects. Significant associations between the 825T allele and diastolic blood pressure, plasma renin, and prorenin levels (inverse), and the aldosterone to renin ratio persisted after adjustment for age, gender, body mass index, and systolic blood pressure. Finally, when the entire sample was considered and an adjustment was made for covariates, the presence of arterial hypertension and the use of antihypertensive medication were both 1. 8-fold higher in the TT than in the CC genotype group (P&lt;0.05 and P=0.06, respectively). This observation, if replicated in further studies, suggests a molecular mechanism that unifies a higher diastolic blood pressure, a lower renin level, and an elevated aldosterone to renin ratio, ie, a combination of features frequently found in patients with arterial hypertension.

Association Between a Polymorphism in the G Protein β3 Subunit Gene and Lower Renin and Elevated Diastolic Blood Pressure Levels