Three single-nucleotide polymorphisms of the angiotensinogen gene and susceptibility to hypertension: single locus genotype vs. haplotype analysis.

Abstract:

:Although some single polymorphism analyses of the angiotensinogen (AGT) gene have been found to be associated with hypertension, the results are still inconsistent. The objectives of this study are to evaluate the association of the genotype and haplotype distributions of three single-nucleotide polymorphisms (SNPs) (G-217A, A-6G, and M235T) in the AGT gene with hypertension. In a sample of 461 hypertensive and 327 normotensive patients in Taiwan, we found that -217AA and -6GG homozygotes conferred independently an increased risk to hypertension (P = 0.008 and P = 0.037, respectively), as illustrated by their significant associations with hypertension in both single SNP and pair-wise SNPs analyses. Meanwhile, a very weak linkage disequilibrium was found between the G-217A and the A-6G polymorphisms in terms of r2 (<0.05). On the basis of likelihood ratio test, only the set of haplotypes that constituted the A-6G and the M235T polymorphisms was associated with hypertension (chi2 = 20.91, P = 0.0008), which was mainly due to the increased frequency of the recombinant haplotypes (-6A identical with 235M and -6G identical with 235T), and a pathophysiological role in the predisposition to hypertension was hence indicated. In functional assays, the promoter activities of the haplotypes -217A identical with -6A and -217G identical with -6G were significantly higher than the most common haplotype -217G identical with -6A. These results highlight the necessity of a thorough analysis of all reported variants of a candidate gene in the elucidation of genetic susceptibility to a complex disease like hypertension, even when the variants are in the same haplotype block.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Wu SJ,Chiang FT,Chen WJ,Liu PH,Hsu KL,Hwang JJ,Lai LP,Lin JL,Tseng CD,Tseng YZ

doi

10.1152/physiolgenomics.00133.2003

subject

Has Abstract

pub_date

2004-04-13 00:00:00

pages

79-86

issue

2

eissn

1094-8341

issn

1531-2267

pii

00133.2003

journal_volume

17

pub_type

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