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Adrenergic receptor polymorphisms associated with resting heart rate: the HyperGEN Study.
J B Wilk1, R H Myers, J S Pankow
1Boston University School of Medicine, MA 02118, USA. jwilk@bu.edu
Annals of Human Genetics
|August 16, 2006
Summary
Genetic variations in adrenergic receptor (ADR) genes influence resting heart rate. While some ADRB1 and ADRA2B polymorphisms show associations, no single gene variant consistently explains a large genetic contribution to heart rate variability.
Area of Science:
- Pharmacogenomics
- Cardiovascular Genetics
- Molecular Biology
Background:
- Adrenergic receptors (ADRs) play a crucial role in regulating heart rate.
- Genetic variations (polymorphisms) in ADR genes may influence individual differences in heart rate.
- The HyperGEN Study provides a valuable dataset for examining gene-heart rate associations in diverse populations.
Purpose of the Study:
- To investigate the association between polymorphisms in beta1, beta2, and alpha2B adrenergic receptor genes (ADRB1, ADRB2, ADRA2B) and resting heart rate.
- To analyze these associations within specific strata of race, hypertension status, and beta-blocker use.
Main Methods:
- Analysis of ADRB1, ADRB2, and ADRA2B gene polymorphisms in relation to resting heart rate.
- Statistical adjustments for covariates including age, sex, BMI, alcohol use, smoking, and exercise.
- Stratified analyses based on race (white and African-American), hypertension status, and beta-blocker use.
Main Results:
- The ADRB1 Ser49Gly polymorphism was linked to higher resting heart rate in hypertensive African-Americans and whites on beta-blockers.
- The ADRB1 Arg389Gly polymorphism was associated with lower heart rate in normotensive African-Americans.
- The ADRA2B C/A polymorphism showed an association with higher heart rate in hypertensive whites and in both races using beta-blockers.
- A specific ADRB1 haplotype (Ser49Gly-Arg389Gly) showed a modest association in hypertensive African-Americans.
Conclusions:
- Each studied adrenergic receptor gene polymorphism demonstrated an association with heart rate in at least one specific subgroup.
- No single polymorphism consistently explained a significant portion of the genetic influence on resting heart rate across all participants.
- These findings suggest a complex interplay of genetic and environmental factors in determining heart rate, with specific polymorphisms having modest effects in defined populations.