Relationship between polymorphisms in beta -2 adrenergic receptor gene and ischemic stroke in North Indian Population: a hospital based case control study
© Kumar et al.; licensee BioMed Central Ltd. 2014
Received: 21 October 2013
Accepted: 13 June 2014
Published: 25 June 2014
Stroke is a multi-factorial disease and influenced by both genetic and environmental factors. The purpose of the present case control study was to check the relationship between beta-2 adrenergic receptor (ADRB2) polymorphism and ischemic stroke in North Indian Population.
In a hospital based case control study, patients with ischemic stroke and control subjects from 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. Frequency distributions of genotypes and alleles were compared between cases and controls using multivariate logistic regression.
In this study, 224 patients and 224 age-and sex-matched control subjects were recruited. Mean age of cases and controls were 53.9 ± 13.4 and 53.6 ± 12.9 years respectively. Multivariate logistic regression analysis showed an independent association between Gln27Glu polymorphism and large vessel stroke (LVD) under a recessive model of inheritance (OR 3.9; 95% CI 1.3 to 11). An age-stratified analysis, suggested independent association between Gln27Glu polymorphism and ischemic stroke, large vessel disease and small vessel disease stroke who had onset of disease at an older age.
The findings of the present study suggest that Gln27Glu polymorphism of the ADRB2 gene may confer higher risk of large vessel disease stroke in a North Indian population. Prospective studies with larger sample size are required for independent validation.
Stroke is the second most common cause of death after ischemic heart disease , but, it ranks first in the Asian regions that have the highest population in the world . There are 16.9 million incident stroke cases worldwide, twice as many stroke survivors, and 5.9 million deaths from stroke . Incidence of stroke in South Asian countries have increased by more than 100% while this is deceased by 42% in developed European courtiers in last four decade . World Health Organisation estimates suggest that by 2050, 80 percent of stroke cases in the world would occur in low and middle income countries, mainly India and China .
Distribution and functions of beta adrenergic receptor
Common functional variants
Vascular smooth muscle
Positively inotropic and chronotropic
Increase aqueous humor
During this study, 224 patients with ischemic stroke and 224 control subjects were enrolled from the ward and outpatient department of Neurology, All India Institute of Medical Sciences (AIIMS), New Delhi, India from the period of February 2010 to April 2012. Ischemic stroke was defined as rapidly developing clinical signs of focal (or global) disturbance of cerebral function, with symptoms lasting more than 24 hours or longer or leading to death, with no apparent cause other than of vascular origin . Stroke is a heterogeneous phenotype, therefore, analysis based on specific stroke cause in important in genetic association studies, therefore, we used TOAST criteria to determine stroke aetiology , which include large vessel stroke which occurs usually due to atherosclerosis or occlusion of major brain artery or branch cortical artery and small vessel stroke which occur due to the involvement of small perforating end arteries within the brain. All subjects underwent standardized clinical evaluations. The study was approved by the All India Institute of Medical Sciences, New Delhi ethics committee (Ref No. P-02/06.10.2008). Informed consent was obtained from each patient/control subject or from the relatives or a legal representative in the case of critically disabled patients. Inclusion and exclusion criteria for cases and control subjects are same as earlier published article by our team . Definitions of variables are same as in the published study .
Sample size calculation was based on parameters of the study reported by Stanzione et al., on beta-adrenergic receptor polymorphism in ischemic stroke in which prevalence for the beta-adrenergic receptor variant Glu27Glu genotype was 0.32 in control group and odds ratio for this polymorphism was 1.68. Assuming 80% power and 5% alpha, with one control per case, we obtained estimated minimum sample size were 212. 224 patients and 224 controls were included in this study to compensate for any loss of sample.
Genomic DNA extraction
Genomic DNA was isolated by conventional Phenol Chloroform Method. DNA concentrations were estimated by measuring the absorbance at 260 and 280 nm using a nanodrop spectrophotometer (Gene Quant, Pharmacia, USA) and its quality was assessed by the A260/A280 ratio. DNA samples with a 260/280 ratio ranging from 1.5 to 1.8 were processed for PCR amplification.
Detection of gene polymorphisms
Genotyping: Primers used for the amplification of Arg16Gly polymorphism of beta-2 adrenergic receptor is: forward: 5’-CTTCTTGCTGGCACGCAAT -3’ reverse: 5’-CCAGTGAAGTGATGAAGTAGTTGG -3’, (PCR product length was 201 bp, restriction enzyme BsrD1; Ferments; 2.5 U for 6 h at 37°C). For determination of Gln27Glu polymorphism, primer used were forward 5’-GAATGAGGCTTCCAGGCGTC-3’ reverse 5’- GGCCCATGACCAGATCAGCA-3’ (PCR product length was 356 bp; restriction enzyme FNu4HI Fermentas; 0.5 U for 6 h at 37°C). The restriction products were separated by electrophoresis in 2.5% agarose gels and visualized in UV light. Gel Images were documented by using gel doc.
Allele frequencies were compared using the Chi square test. The conditional logistic regression model was used to estimate Odds ratio (OR) and 95% confidence intervals (CIs) for association of beta-1 receptor polymorphisms with ischemic stroke. Multivariate logistic regression was used to control the confounding effect of demographic and risk factor variables. Tests were considered significant at P < 0.05. The chi square test was used to determine the frequency distribution of genotypes, were in accordance with Hardy-Weinberg equilibrium (HWE). Data were analyzed using the SPSS statistical package, version 17.0 (SPSS, Chicago, IL, USA).
Demographic and risk factors variables of Ischemic stroke patients and controls
Unadjusted OR (95% CI), p value
*Adjusted OR (95% CI), p value
aAge ± SD (years)
53.9 ± 3.4
53.6 ± 12.9
Hypertension n (%)
5.8 (3.8 to 8.8), < 0.001
6.6 (3.4 to 12.9), <0.001
Smoking n (%)
2.4 (1.6 to 3.6), < 0.001
2.8 (1.5 to 5.2), 0.001
Diabetes n (%)
2.4 (1.5 to 3.8), 0.001
1.5 (0.85 to 2.8), 0.15
Migraine n (%)
1.3 (0.67 to 2.8), 0.37,
Dyslipidemia n (%)
3.6 (2.3 to 5.7), < 0.001
3.8 (1.9 to 7.7), <0.001
FHS n (%)
3.7 (2 to 6.8), < 0.001
5.2 (2.3 to 11.5), <0.001
Association between Arg16Gly and Gln27Glu polymorphisms of beta -2 adrenergic receptor and Ischemic stroke
Genotype distribution (%)
Allele distribution (%)
OR [95% CI],
OR [95% CI],
OR [95% CI],
1.3 [0.7 to 2.3],
[0.76 to 3.2],
[0.74 to 3.3],
1.3 [0.7 to 2.3],
[0.21 to 7.6,]
[0.07 to 13],
1.4 [0.8 to 2.6],
[0.71 to 12],
[0.43 to 13],
1.6 [0.91 to 3.1],
[0.98 to 8.1],
[0.91 to 2.7],
1.6 [0.91 to 3.1],
[1.3 to 11],
[0.81 to 2.9],
1.6 [ 0.87 to 2.9],
[0.15 to 6.1]
[0.44 to 5],
Haplotype frequencies of beta-2 adrenergic receptor Arg16Gly and Gln27Glu polymorphisms
Case n (%)
Control n (%)
OR (95% CI)
4.5 (2.9 to 7)
2.3 (1.7 to 3.2)
1.5 (1.001 to 2.2)
In this hospital based case control study, a common functional polymorphism at Gln27Glu position of beta-2 AR was found to be associated with more than threefold increased risk of LVD stroke.
Frequency distribution of variant allele of Arg16Gly and Gln27Glu polymorphism in few of different ethnic regions
Allele frequency (%)
Coronary artery disease
Chronic obstructive pulmonary disease
Chronic obstructive pulmonary disease
In vitro studies have shown higher agonist induced desensitization for Gly16 variant in comparison to Arg16 variant after the administration of isoprenaline which is a nonselective beta adrenergic agonist . In vitro study  has indicated that Glu27 variant produces a higher degree of responsiveness to adrenergic agonist with resistance to down regulation relative to wild type allele, however, strong linkage disequilibrium between codon 16 and codon 27 and there is greater probability that subjects who are carrying Glu27Glu genotype are mostly homozygous for Gly16 allele than Arg16 . Our study also showed similar linkage disequilibrium. Gly16-Glu27 haplotype showed enhanced receptor down regulation after exposure to isoprenaline when compared with Arg16-Glu27 . Due to strong linkage disequilibrium, it has been suggested that subject carrying Gly16-Glu27 haplotype may have greater down regulation and desensitization as compared to Arg16 allele [30, 33]. Down regulation of this receptor may lead to decrease in concentration of cyclic AMP in the vascular smooth muscle, lungs, kidney, and sympathetic terminal. This decrease in cyclic AMP leads to modulation of atherosclerosis, recruitment of reactive oxygen species, and recruitment of circulating monocytes to the artery wall and their differentiation into macrophage foam cell, by controlling the expression of proinflammatory and anti-inflammatory interleukin . By these mechanisms, beta-2 adrenergic receptor gene polymorphisms might influence the genetic predisposition to ischemic stroke. Several studies have shown the independent association of Gln27Glu polymorphism of beta-2 adrenergic receptor gene polymorphism with a number of diseases like obesity [34, 35], dyslipidemia , myocardial infarction , diabetes . Few studies have addressed the association of beta-2 receptor polymorphism with ischemic stroke and both positive and negative associations have been reported. A case control study, reported from Italy, indicated a positive association between Gln27Glu polymorphism and Ischemic stroke . A previous study by Heckbert et al., failed to show significant association of beta-2 adrenergic receptor variant with the incidence of stroke . A prospective cohort study included 25225 women showed that the different haplotypic combination of beta receptor gene variant did not affect the incidence of ischemic stroke in women . A case control study reported by Zhao et al. did not find significant association of Gln27Glu polymorphism with risk of ischemic stroke, however, higher frequency of variant Glu27 allele in ischemic stroke patients (0.11) than controls (0.07) has been observed . In all the published case control studies (three), the frequency of the risk allele (Glu27) was higher in cases as compared to controls. Our study also indicated a significant association between Gln27Glu polymorphism and ischemic stroke associated with large vessel disease.
Hypertension is a most important and common risk factor for stroke. A meta-analysis published by Lou Y, et al., showed significant association between Arg16Gly polymorphism and risk of hypertension under a dominant model in a subgroup of mixed African (OR, 1.18, 95% CI, 1.01 to 1.87, P = 0.04). This meta-analysis also indicated the significant association between Gln27Glu polymorphism and hypertension under a dominant model of inheritance (OR, 1.38; 95% CI, 1.02 to 1.86) . Other polymorphisms such as on gene CaMK4 (calcium/calmodulin-dependent kinase 4) which has a role in regulation of vascular tone also have been shown to be associated with hypertension . A previous study has demonstrated that more than 85% patients with CHD have at least 1 of five modifiable risk factors (hypertension, diabetes, and hypercholesterolemia, smoking and family history) [43, 44]. A previous study indicated that the P (A2) polymorphism is a genetic determinant of ischemic stroke in a high-risk hypertensive population . Our analysis, stratified by hypertension indicates that Glu27 variant is associated with both the hypertensive and non-hypertensive stroke subjects and shows a similar pattern of associations in both the groups (Additional file 1: Table S4).
The age-related decline in beta-adrenergic receptor function and subsequent cyclic AMP generation  is a common factor underlying atherosclerosis, vascular insufficiency and hypertension . A study has shown that age-associated decline in beta-adrenergic receptor sensitivity in the cardiovascular system . Our age-stratified analysis, showed significant associations of Gln27Glu polymorphism in only those patients who had onset of disease at late (>50 years) stage. During old age conventional risk factors of stroke becomes more prevalent and it is possible that Glu27 variant may interact at later stages of age with other conventional risk factors that cause stroke.
In the present study, individuals who had Arg16-Glu27 haplotype were found to have a higher risk of ischemic stroke. This association shows the additive effects of both the alleles and may have enhanced combined impact of ischemic stroke risk. The present study suggests that Haplotype Gly16-Glu27 was most prevalent haplotype and significantly associated with risk of ischemic stroke. This is consistent with finding of the study reported by Stanzione et al..
Studies have shown that there is a relationship between the effectiveness of beta-blocker treatment and beta adrenergic receptor polymorphism . Further studies are required to check the significance of beta blocker treatment and stroke prevention in carrier of beta-adrenergic receptor polymorphism.
Limitation of the study
The sample size of the present study might not be large enough to detect small effects of low penetrance SNPs. Each susceptible polymorphism may only contribute to mild effect, thus the analysis of single SNP could be ambiguous by unstudied polymorphisms and environmental factors that influences the phenotype. Borderline deviation from HWE was observed in the distribution of genotypes in patients with LVD stroke. We cannot completely exclude the effects of residual confounding attributable to the measurement error in the assessment of confounding factors. In the present study, the numbers of male patients were more than double the number of female patients, which substantiates that results of this study may be applied to male ischemic stroke populations.
In conclusion, this study provides evidence that the presence of Arg16-Glu27 haplotype of beta-2 adrenergic receptor in the subjects might confer increased risk of developing ischemic stroke. Gln27Glu polymorphism may confer increased risk for developing stroke associated with large vessel. Identification of a subgroup of patients, who are carrier of beta-adrenergic receptor polymorphism, may have implication for planning their future treatment strategies. Prospective studies with larger sample size are required for independent validation.
Funding support of the study was obtained from the Indian Council of Medical Research, Government of India.
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