C825T polymorphism of G protein β3 subunit in cerebral infarction patients with a history of hypertension

Abstract

Objective To investigate the relationship between the C825T polymorphism of G protein β3 subunit （GNB3） and essential hypertension and cerebral infarction patients with a history of hypertension. Methods The C825T polymorphism of GNB3 was determined by polymerase chain reaction-restriction fragment length polymorphism in 110 healthy subjects aged over 40 years, 92 patients with essential hypertension, and 80 cerebral infarction patients with a history of hypertension. Sex, age, family histories of diabetics, smoking and alcoholic consumption were documented, and body mass index, waist-hip ratio, total cholesterol （TC）,trigtyceride （TG）, high-density lipoprotein cholesterol （HDL-C）, and fasting blood glucose concentration were measured. A multivariate logistic regression analysis was used to screen the factors associated with the occurrence of cerebral infarction in patients with hypertension. Results The distribution of the C825T polymorphism of GNB3 in the 3 groups all met the Hardy-Weinberg Law of genetic equilibrium. The genotype frequencies of CC, CT and TT in cerebral infarction patients with a history of hypertension were 33%, 57%, and 20%, respectively; those in patients with essential hypertension were 33%, 42%, and 25% ; respectively; and those in the control group were 26%, 54%, and 20%, respectively. There were no significant differences 0（x2=4.030, P = 0. 402）. The allele frequencies of 825T in the 3 groups were 39%, 40%, and 47%, respectively. There were no significant differences （x2=0. 832）. A multivariate logistic regression analysis showed that TC （odds ratio [OR] 10. 810, 95% confidence interval [ CI] 2. 645-44. 136, P =0. 000）, TG （OR 5. 453, 95% CI 1. 662-17. 881, P =0. 005）, HDL-C （OR, O. 181, 95% CI O. 041-0. 795, P = 0. 027）, blood glucose （OR 2. 386, 95% CI 1. 062-5. 363, P=0, 035）, and diabetes （OR 7. 156, 95% CI 1. 271-40. 291, P=0. 026） were the independent risk factors for cerebral infarction, and the GNB3 genotype and allele did not enter the model. Conclusions The C825T polymorphism of GNB3 may not be associated with cerebral infarction and essential hypertension. Key words: GTP-binding proteins; Brain infarction; Hypertension; Polymorphism, genetic