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The genetic response to short-term interventions affecting cardiovascular function: rationale and design of the
Braxton D Mitchell1, Patrick F McArdle, Haiqing Shen
1Division of Endocrinology, Department of Medicine, Diabetes and Nutrition, University of Maryland School of Medicine, Baltimore, MD 21201, USA. bmitchel@medicine.umaryland.edu
Insights
Cardiovascular disease (CVD) risk is influenced by genetics. The HAPI Heart Study found that some variation in how individuals respond to interventions like high salt or fat diets is heritable, suggesting genetic links to CVD risk.
Area of Science:
- Genetics
- Cardiovascular Disease Research
- Human Physiology
Background:
- Cardiovascular disease (CVD) etiology is complex and multifactorial.
- Previous genetic studies for CVD risk have had limited success due to small allele effects and gene interactions.
- Gene by gene and gene by environment interactions complicate the identification of CVD risk factors.
Purpose of the Study:
- To investigate cardiovascular responses to short-term interventions.
- To identify genetic and environmental determinants of these cardiovascular responses.
- To explore novel mechanisms influencing CVD risk.
Main Methods:
- The HAPI Heart Study measured responses in 868 Amish adults.
- Interventions included cold pressor test, high salt diet, high-fat challenge, and aspirin therapy.
- Measurements assessed blood pressure, triglyceride levels, and platelet aggregation.
Main Results:
- Heritability estimates for response traits ranged from 8% to 38%.
- This indicates that additive gene effects contribute to individual variations in response to interventions.
- Significant genetic influence on cardiovascular responses to various challenges was observed.
Conclusions:
- Genetic factors play a role in cardiovascular responses to specific challenges.
- Identifying genes associated with these responses may reveal new CVD mechanisms.
- This research could pave the way for personalized prevention and early detection of high-risk individuals.
Background:
The etiology of cardiovascular disease (CVD) is multifactorial. Efforts to identify genes influencing CVD risk have met with limited success to date, likely because of the small effect sizes of common CVD risk alleles and the presence of gene by gene and gene by environment interactions.
Methods:
The HAPI Heart Study was initiated in 2002 to measure the cardiovascular response to 4 short-term interventions affecting cardiovascular risk factors and to identify the genetic and environmental determinants of these responses. The measurements included blood pressure responses to the cold pressor stress test and to a high salt diet, triglyceride excursion in response to a high-fat challenge, and response in platelet aggregation to aspirin therapy.
Results:
The interventions were carried out in 868 relatively healthy Amish adults from large families. The heritabilities of selected response traits for each intervention ranged from 8% to 38%, suggesting that some of the variation associated with response to each intervention can be attributed to the additive effects of genes.
Conclusions:
Identifying these response genes may identify new mechanisms influencing CVD and may lead to individualized preventive strategies and improved early detection of high-risk individuals.
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