血管紧张素转换酶基因多态性与冠心病及其冠状动脉粥样硬化病变程度的关系

目的：研究汉族人血管紧张素转换酶（ACE）基因多态性与冠状动脉造影确诊的冠心病及其冠状动脉粥样硬化病变程度的关系。方法：应用聚合酶链反应技术和遗传学方法，测定169例经冠状动脉造影确诊的冠心病患者和168例汉族正常人的ACE基因插入／缺失（I／D）多态性。比较ACEI／D多态性与冠心病及其冠状动脉病变支数和冠状动脉积分的关系。砖杲：①汉族正常人和冠心病患者的ACE基因型频率观察数与期望数差异均无显著性（P均〉0．05）；②冠心病患者ACEDD基因型频率显著高于正常人（0．296vs0．161，P〈0．01）；③冠心病患者冠状动脉单支、双支、多支病变组比较，ACE基因型与等位基因频率差异均无显著性（P均〉0．05）；④冠心病患者的冠状动脉积分在ACE基因型间差异无显著性（P〉0．05）。砖论：ACE基因缺失多态性与冠心病有关，与冠状动脉粥样硬化病变程度无关。

Polymorphism of angiotensin converting enzyme in Han populations and its relevance to the severity of coronary atherosclerosis

OBJECTIVE: To explore the polymorphism angiotensin converting enzyme (ACE) in Han populations and its relevance to the severity of coronary atherosclerosis. METHODS: The ACE genotype distribution was detected in 169 patients aged (62.0 +/-9.9) years] with coronary artery disease (CAD) confirmed with angiography and in 168 normal controls aged (61.0 +/-7.7) years]. The severity of coronary lesions in the patients was assessed by the number of major coronary arteries with more than 50% luminal obstructions and by the Gensini coronary score. Associations of the severity of coronary artery lesions with the ACE I/D polymorphism in the patients were analyzed. RESULT: The frequencies of the ACE genotype in the CAD patients were 0.296 for DD, 0.391 for ID, and 0.314 for II genotypes, while in the normal controls the genotype distribution was in Hardy-Weinberg equilibrium (DD, 0.161; ID, 0.512; II, 0.327); a significantly excess of the DD genotype in CAD patients was found (P<0.01). No associations were observed between the ACE polymorphism and the number of significantly stenosed coronary arteries. CONCLUSION: The ACE gene polymorphism is a significant predictor for CAD in the Han population but is not a marker for the severity of coronary atherosclerosis.