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Pharmacogenetics of antihypertensive treatment: detailing disciplinary dissonance
Donna K Arnett1, Steven A Claas
1University of Alabama at Birmingham, Birmingham AL 55294-0022, USA. arnett@ms.soph.uab.edu
Insights
Hypertension pharmacogenetics aims to predict blood pressure drug responses using genetics. While consistent findings are emerging, large-scale studies are needed for clinical use.
Area of Science:
- Pharmacogenetics
- Cardiovascular Medicine
- Genetics
Background:
- Hypertension significantly increases cardiovascular risks.
- Blood pressure control is poor in many patients due to unpredictable drug responses.
- Current treatment relies on empirical methods.
Purpose of the Study:
- To review recent studies on genetic predictors of antihypertensive drug response.
- To assess the progress and challenges in hypertension pharmacogenetics.
Main Methods:
- Systematic review of 18 pharmacogenetic studies published since 2005.
- Analysis of gene-treatment associations and response variability.
Main Results:
- Some consistent gene-treatment combinations are emerging.
- Findings are often inconsistent and insufficient for clinical translation.
- Inconsistencies stem from study design, phenotyping, and sample size limitations.
Conclusions:
- Hypertension pharmacogenetics shows promise but requires further research.
- Large-scale, high-fidelity studies across diverse populations are essential for clinical application.
Abstract:
Hypertension is a common condition associated with increased cardiovascular morbidity and mortality. In the USA only approximately a third of those who are aware of their hypertensive status successfully control their blood pressure. One reason for this is the unpredictable response individuals have to treatment. Clinicians must often rely on empirical methods to match patients with effective drug treatment. Hypertension pharmacogenetics seeks to find genetic predictors of response to drugs that lower blood pressure and to translate this knowledge into clinical practice. To date, around 60 studies have investigated associations between genetic polymorphisms and response to antihypertensive drugs. Here we review 18 studies that have been published since 2005. While consonant findings that are insufficient for clinical translation remain the norm, some consistent findings are emerging with several gene-treatment combinations. Nonetheless, differences in study designs, variable methods for assessing pharmacologic exposures, heterogeneous phenotypes (that is, response variables and outcomes ranging from blood pressure to clinical outcomes) and small sample sizes coupled with a short duration of follow-up in many studies account for a large portion of these inconsistencies. Progress in the future will depend upon our ability to launch large studies using high-fidelity phenotyping with multiple drugs and multiple ethnic groups.
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