血管紧张素Ⅱ 1型受体基因单核苷酸多态性与原发性高血压和冠心病的相关研究

目的研究血管紧张素Ⅱ1型受体基因（AT1）单核苷酸多态性（SNP）与华东地区汉族人原发性高血压和冠心病的相关性。方法对AT1基因的启动子区、5’非翻译区、外显子及邻近内含子和3’非翻译区设计引物进行分段扩增,采用直接测序法在20个随机样本中检测AT1基因的SNP,选择所发现的SNP在213例单纯高血压、171例高血压合并冠心病和200例正常对照中进行基因分型,以期探讨ATl基因在原发性高血压和冠心病发病中的作用。结果共检出8个SNP,其中6个在启动子区,1个在编码区,1个在3’非翻译区,分别对SNP6（A-153G）、SNP7（T573C）和SNP8（A1166C）行基因分型,显示位于启动子-153G等位基因在原发性高血压合并冠心病组中的频率是17．8％,在对照组中是11．5％（P〈0．05）,而T573C和A1166C多态则未显示有统计学意义。结论血管紧张素Ⅱ1型受体基因启动子-153位A被G替代可能与华东汉族人原发性高血压患者合并冠心病相关。

Association of angiotensin II receptor type 1 gene single nucleotide polymorphism with Chinese essential hypertension complicated with coronary heart disease

OBJECTIVE: To identify the genetic variants of angiotensin II type 1 receptor (AT1) gene in a population of Han ethnicity in east China and to determine whether the AT1 gene polymorphisms are associated with essential hypertension (EH) and coronary heart disease (CHD). METHODS: The detection of single nucleotide polymorphisms (SNPs) was performed in 20 subjects by a direct DNA sequencing. All 213 EH patients, 171 patients of EH with CHD and 200 controls were genotyped by three detected SNPs. RESULTS: Eight positive SNPs were detected in the promoter, exon and 3' untranslated region (3'UTR) of AT1 gene. A case-control study by using a frequent SNP (A-153G) in the promoter region, showed a significant increase in allele frequency of G-153 in the subjects of EH complicated with CHD (17.8% vs 11.5% for normal controls, P < 0.05). The SNP A1166C, which has been widely studied, manifested no difference in the three groups. CONCLUSION: A polymorphism in the promoter region (A-153G) of AT1 gene might be involved in the development of EH and CHD in Han ethnicity population in east China.