Left Ventricle Mass Index and the Common, Functional, X-Linked Angiotensin II Type-2 Receptor Gene Polymorphism (−1332 G/A) in Patients With Systemic Hypertension
作者:
Khaled Alfakih,
Azhar Maqbool,
Mohan Sivananthan,
Kevin Walters,
Gavin Bainbridge,
John Ridgway,
Anthony Balmforth,
Alistair Hall,
期刊:
Hypertension: Journal of The American Heart Association
(OVID Available online 2004)
卷期:
Volume 43,
issue 6
页码: 1189-1194
ISSN:0194-911X
年代: 2004
出版商: OVID
关键词: hypertension;hypertrophy;receptors;angiotensin;magnetic resonance imaging;genetics
数据来源: OVID
摘要:
A common intronic polymorphism, (−1332 G/A) of the angiotensin type-2 receptor gene, located on the X-chromosome, has been reported to be functional. The aim of our study was to evaluate this polymorphism for an association with left ventricular hypertrophy. Left ventricle (LV) mass was measured in 197 patients with systemic hypertension and 60 normal volunteers using a 1.5-Tesla Philips MRI system. Genotyping was performed using a restriction enzyme digestion of an initial 310-bp polymerase chain reaction product that included the angiotensin type-2 (−1332 G/A) locus. The mean LV mass index for the male patients was 94.3±19.6 g/m2(n= 125) and for the female patients was 71.2±12.0 g/m2(n=72). Seventy-three (37.1%) of all patients had an elevated LV mass index, defined as the mean LV mass index for normal volunteers plus 2 SD (males 77.8±9.1 g/m2, n= 30; females 61.5±7.5g/m2, n= 30). Comparison of LV mass index of the A_/AA genotype (mean LV mass index= 82.4±21.1 g/m2; n= 123) against that of the G_/GG genotype (mean LV mass index= 88.1±19.0 g/m2; n= 89) as a continuous variable was significant by ANOVA (P= 0.044). χ2Comparison between subjects with and subjects without left ventricular hypertrophy revealed an excess of the G_/GG genotype among the group with LV hypertrophy (P= 0.031). We observed an association between the angiotensin type-2 receptor (−1332 G) allele and the presence of left ventricular hypertrophy in hypertensive subjects.
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