血管紧张素转化酶基因多态性与其血清rn水平及老年高血压病的关系

摘要

Objective To investigate angiotensin converting enzyme (ACE) gene insertion/deletion (I/D) polymorphism in patients with hypertension in the elderly and it's relation with serum ACE level among Chinese population.Methods Polymorphism of ACE gene was categorized into three genotype:two deletion alleles (genotype DD),heterozygous alleles (genotype ID),and two insertion alleles (genotype II).Polymerase chain reaction(PCR) was used to examine ACE gene polymorphism.Compared the distribution of three ACE genotypes frequencies and D allele frequency in 56 patients with hypertension in the elderly and 40 healthy subjects,whose serum ACE levels were measured.Results The frequency of D allele was higher in the hypertension group (0.61) than in healthy subjects (0.46) (P<0.05).A significant difference in serum ACE level was observed between the hypertensives and healthy (31.0±11.1) U/L and (25.1±10.0) U/L respectively,P<0.05.The highest level of serum ACE activity was in genotype DD,and the lowest level in genotype II,and intermediate in genotype ID.A significant difference in serum ACE level was observed among the genotype DD and ID,and among the genotype DD and II.Conclusion ACE gene I/D polymorphism was associated with serum ACE level.D allele might be a genetic risk factor for hypertension in the elderly.%目的探讨中国人群中血管紧张素转化酶(ACE)基因的插入/缺失(I/D)多态性与其血清水平及老年高血压病之间的关系。方法应用多聚酶链反应(PCR)方法检测ACE基因多态性，同时测定血清ACE水平，对56例老年高血压病患者与40例老年健康对照者进行比较分析。结果老年高血压组D等位基因频率显著高于对照组(0.61 vs 0.46,P<0.05)，血清ACE水平亦显著高于对照组［(31.0±11.1) U/L vs (25.1±10.0) U/L,P<0.05］。血清ACE水平依次为：DD型>ID型>II型。DD型与ID型及DD型与II型之间均具有显著差异。结论 ACE基因多态性与血清ACE水平有关，DD基因型者血清ACE水平显著升高，D等位基因可能是老年高血压发病的遗传学基础之一。