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Association analysis of endothelial nitric oxide synthase gene polymorphism with primary hypertension in a Singapore population

Journal of Human Hypertension volume 20, pages 956–963 (2006)Cite this article

Abstract

Vascular endothelial cells produce nitric oxide (NO), which contributes to the regulation of blood pressure and regional blood flow. Endothelial nitric oxide synthase (eNOS) gene polymorphisms are associated with coronary artery disease, but their linkage with primary hypertension is controversial. A total of 103 individuals with primary hypertension and 104 normotensive control subjects were studied in Singapore. The specific genotypes for G894T missense variant in exon 7, variable number tandem repeats (VNTR) in intron 4 (eNOS 4A/B/C) and T−786C in the promoter were isolated using allele-specific gene amplification and restriction fragment length polymorphism to examine the association of genotype and allelic frequency in both groups. Logistic regression analysis was also used to detect the association between genotypes and hypertension. Five genotypes of intron 4 VNTR (AA, AB, BB, AC and BC) were observed. Intron 4 B/B genotype was significantly associated with the hypertension group (P=0.035), but disequilibrium of G894T and T−786C was absent between the two groups (P=0.419 and P=0.227), respectively. The overall distribution of allelic frequency differed significantly between the two groups, with four-repeat allele (4A) of intron 4 more frequent in the normotensive group than the hypertensive group (P=0.019). Logistic regression analysis showed that intron 4 B/B genotype was significantly associated with systolic blood pressure of individuals with body mass index greater than 25 kg/m2 (P=0.04). In conclusion, the eNOS 4 B/B genotype is a genetic susceptibility factor for primary hypertension in a Singapore population.

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Acknowledgements

This work was supported by the National Medical Research Council, Singapore.

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Authors and Affiliations

  1. Research and Development Unit, National Heart Centre, Singapore, Singapore

    K T Moe & P Wong

  2. Cardiology Department, National Heart Centre, Singapore, Singapore

    S T Lim, P Wong, T Chua & T H Koh

  3. Neurology Department, National Neuroscience Institute (Singapore General Hospital), Singapore

    D A DeSilva & M C Wong

  4. Vascular Pharmacology, Wynn Domain, Baker Heart Institute, Melbourne, Australia

    J Chin-Dusting

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  1. K T Moe
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Moe, K., Lim, S., Wong, P. et al. Association analysis of endothelial nitric oxide synthase gene polymorphism with primary hypertension in a Singapore population. J Hum Hypertens 20, 956–963 (2006). https://doi.org/10.1038/sj.jhh.1002096

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