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Renin-angiotensin-aldosterone system gene polymorphisms and hypertension in Hong Kong Chinese
G N Thomas1, R P Young, B Tomlinson
1Department of Medicine and Therapeutics, The Chinese University of Hong Kong, The Prince of Wales Hospital, Shatin. thomas1997@cuhk.edu.hk
Insights
Genetic variations in the renin-angiotensin-aldosterone system (RAAS) are not linked to hypertension in Chinese populations. However, significant differences in RAAS gene polymorphisms exist between Chinese and Caucasian populations.
Area of Science:
- Cardiovascular Genetics
- Hypertension Research
- Population Genetics
Background:
- Hypertension is prevalent in Chinese populations, posing risks for cerebrovascular and coronary heart disease.
- The renin-angiotensin-aldosterone system (RAAS) plays a crucial role in blood pressure regulation and salt homeostasis.
- RAAS gene polymorphisms are implicated in hypertension and vascular disease pathogenesis.
Purpose of the Study:
- To investigate the association between three RAAS gene polymorphisms and hypertension in Chinese individuals.
- To compare RAAS gene polymorphism frequencies between Chinese and Caucasian populations.
Main Methods:
- Genotyping of angiotensin-converting enzyme (ACE) insertion/deletion, angiotensinogen (AGT) M235T, and angiotensin II type 1 receptor A1166C polymorphisms.
- Analysis of genotype and allele frequencies in 232 hypertensive and 178 normotensive Chinese subjects.
- Comparison with published data from Caucasian populations.
Main Results:
- No significant differences in genotype or allele frequencies for the studied RAAS polymorphisms were found between hypertensive and normotensive Chinese groups.
- No interactive effect of ACE and AGT polymorphisms on blood pressure was observed.
- Substantial differences in genotype and allele frequencies were noted between Chinese and Caucasian populations.
Conclusions:
- The investigated RAAS gene polymorphisms (ACE, AGT, AT1R) are unlikely to be major contributors to hypertension pathogenesis in the Chinese population.
- Significant genetic disparities in RAAS polymorphisms exist between Chinese and Caucasian ethnic groups, warranting further investigation.
Abstract:
In Chinese populations, hypertension is common and is a major risk factor for cerebrovascular and coronary heart disease. The renin-angiotensin-aldosterone system (RAAS) helps maintain blood pressure and salt homeostasis and appears important in the pathogenesis of hypertension and some forms of vascular disease. We investigated three RAAS gene polymorphisms, the angiotensin-converting enzyme (ACE) insertion/deletion, angiotensinogen (AGT) M235T and angiotensin II type 1 receptor A1166C polymorphisms in 232 hypertensive and 178 normotensive Chinese subjects. The hypertensives were generally more obese and dyslipidaemic. No significant differences in genotype or allele frequencies for any of the polymorphisms were identified between the groups, nor was there any interactive contribution to blood pressure by the ACE and AGT polymorphisms. However, there were large differences in genotype and allele frequencies between the healthy Chinese and published data for equivalent Caucasian populations. These findings suggest these polymorphisms are unlikely to be involved in the pathogenesis of hypertension in Chinese.