Association between beta-1 adrenergic receptor gene polymorphism and ischemic stroke in North Indian population: a case control study.

Stroke is a multi-factorial disease caused by a combination of genetic and environmental factors. The purpose of this case control study was to determine the relationship of beta-1 adrenergic receptor polymorphism with ischemic stroke in North Indian population. In this study, 224 patients and 224 age- and sex-matched controls were recruited from the outpatient department and neurology ward of All India Institute of Medical Sciences, New Delhi. Genotyping was performed by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. PCR results were confirmed by DNA sequencing. Frequency distributions of genotypes and alleles were compared between cases and controls using logistic regression. Mean age of cases and controls was 53.9 ± 13.4 and 53.6 ± 12.9 years respectively. Multivariate logistic regression analysis showed an independent association between Ser49Gly polymorphism and ischemic stroke under a dominant model of inheritance (OR, 2.5; 95% CI, 1.2 to 5) and large vessel disease (LVD) under a recessive model of inheritance (OR, 6.5; 95% CI, 1.7 to 23; P=0.005). Independent association of Arg389Gly polymorphism with small vessel disease (SVD) (OR, 7.09; 95% CI, 1.9 to 25; P=0.003) under recessive model of inheritance. The findings of the present study Ser49Gly polymorphism of the ADRB1 gene confer higher risk of ischemic stroke in a North Indian population and especially in patients with LVD. Our findings also show that Arg389Gly polymorphism of ADRB1 confers higher risk of SVD in North Indian population.