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[Genetic polymorphisms in the renin-angiotensin system]
1Département d'Hypertension Artérielle, Hôpital Broussais, Paris, France.
Therapie
|October 17, 1998
Summary
Genetic variations in the renin-angiotensin system, like angiotensinogen (AGT) and ACE, are linked to hypertension and cardiovascular diseases. Specific polymorphisms influence protein concentration and activity, impacting blood pressure and disease progression.
Area of Science:
- Genetics and Molecular Biology
- Cardiovascular Physiology
- Hypertension Research
Context:
- The renin-angiotensin system (RAS) plays a crucial role in regulating blood pressure and fluid balance.
- Genetic variations within RAS components can influence susceptibility to cardiovascular diseases.
- Previous studies have identified chromosomal localizations for key RAS genes: AGT (1q42), REN (1), ACE (17), AT1R (3), and AT2R (X).
Purpose:
- To investigate the association between genetic polymorphisms in RAS genes and essential hypertension.
- To explore the functional implications of these polymorphisms on gene expression and protein activity.
- To understand the link between RAS gene variants and various cardiovascular and renal pathologies.
Summary:
- A positive linkage and association exist between the angiotensinogen (AGT) gene and essential hypertension, with the M235T polymorphism correlating with plasma AGT concentration.
- The G-6A promoter polymorphism in AGT, in linkage disequilibrium with M235T, may explain the association with high blood pressure.
- The ACE I/D polymorphism significantly explains variance in plasma ACE levels, and while not directly linked to blood pressure, its associated chromosomal region is implicated in hypertension.
- Increased ACE activity due to the ACE I/D polymorphism is associated with coronary heart disease, left ventricular hypertrophy, vascular neointimal proliferation, and nephropathy progression.
Impact:
- These findings highlight the role of specific genetic polymorphisms in the RAS as potential biomarkers for hypertension risk.
- Understanding these genetic associations can inform the development of targeted therapeutic strategies for cardiovascular and renal diseases.
- The study underscores the complex interplay between genetic factors and physiological regulation in the context of blood pressure homeostasis and disease pathogenesis.