检验医学 ›› 2012, Vol. 27 ›› Issue (5): 412-415.

• 分子生物学检验论著 • 上一篇    下一篇

PCSK9基因I474V多态性与冠心病相关性的研究

林勇平1,孟艳辉2,郑卫东3,刘忠民1   

  1. 1.广州医学院第一附属医院检验科,广东 广州 510120,2.广东省计划生育科学技术研究所,广东 广州 510080,3.广东省人民医院检验科,广东 广州 510055
  • 收稿日期:2012-03-23 出版日期:2012-05-30 发布日期:2012-05-10
  • 通讯作者: 刘忠民, 联系电话:020-83062158。
  • 作者简介:林勇平,男,1973年生,博士,讲师,主要从事临床生化与分子生物学检验工作。
  • 基金资助:

    广东省高等学校重点扶持学科资助项目(粤教科[2007]26号),广州市教育局市属高校科研项目(10A259)

Research on the correlation of PCSK9 gene I474V polymorphism with coronary artery disease

  1. 1. Department of Laboratory Medicine, the First Affiliated Hospital of Guangzhou Medical University,Guangdong Guangzhou 510120, China;2. Guangdong Institute of Planned Parenthood Research,Guangdong Guangzhou 500800, China;3. Department of Laboratory Medicine, Guangdong General Hospital, Guangdong Guangzhou 510055, China
  • Received:2012-03-23 Online:2012-05-30 Published:2012-05-10

摘要: 目的 探讨人蛋白原转化酶枯草杆菌蛋白酶9(PCSK9)基因I474V位点在冠心病(CAD)患者和健康人群中的分布特点以及与血脂水平、CAD发生、病变程度的相关性,为阐明CAD的遗传发病机理、患者危险性分级评估等提供实验依据。方法 采集经冠状动脉造影确诊的CAD患者血液标本288例,健康对照者血液标本300例,提取基因组DNA模板,应用双向等位基因特异性引物聚合酶链反应(Bi-PASA PCR)技术检测PCSK9基因I474V多态性位点,并用基因测序法验证结果。血清总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)水平用酶法测定。结果 PCSK9基因I474V 多态性位点主要以II和IV基因型存在。CAD组和对照组在I474V位点的等位基因频率、基因型频率分布差异无统计学意义(P>0.05)。CAD组和对照组之间TC、LDL-C、HDL-C水平差异具有统计学意义(P<0.05),TG水平差异无统计学意义(P>0.05)。CAD组中II和IV基因型之间TC、TG水平的差异具有统计学意义(P<0.01),HDL-C、LDL-C水平差异无统计学意义(P>0.05)。与非I474V携带者比较,I474V 携带者血TC、TG水平增高。IV基因型的冠状动脉病变支数明显高于II基因型(P<0.05)。结论 PCSK9基因I474V 多态性位点主要以II和IV基因型存在,CAD患者PCSK9基因I474V位点的基因型与TC、TG水平升高相关联,同时与CAD病变严重程度存在一定关联。

关键词: 人蛋白原转化酶枯草杆菌蛋白酶9, I474V多态性, 基因, 冠心病

Abstract: Objective To investigate the distribution characteristics of the I474V loci of proprotein convertase subtilisin lkexin type 9 (PCSK9) gene in coronary artery disease (CAD) patients and healthy subjects, study the correlation of blood lipid levels, the development of CAD and the severity of coronary lesions,and provide the reference to elucidate the pathogenesis and genetic risk assessment of CAD.   Methods According to the results of coronary angiography, blood samples from 288 CAD patients and 300 healthy controls were collected. I474V polymorphism loci in PCSK9 gene was detected by bi-directional polymerase chain reaction (PCR) amplification of specific alleles (Bi-PASA PCR). The results were further confirmed by cycle sequencing. Serum levels of total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were measured by enzymatic methods. Results Ⅱ and Ⅳ genotypes were dominant in the I474V polymorphism loci of PCSK9 gene. No significant difference was found in allele frequencies of I474V loci between CAD patients and healthy controls (P>0.05). There was statistical significance in TC, LDL-C and HDL-C levels between CAD patients and healthy controls (P<0.05), and the TG level had no statistical significance (P>0.05). Serum levels of TC and TG (P<0.05), but not HDL-C and LDL-C (P>0.05) were statistically different between Ⅱ and Ⅳ genotypes in CAD patients. Subjects with I474V polymorphism of PCSK9 gene had significantly higher serum levels of TC and TG than subjects without I474V polymorphism. The number of coronary lesions was more in patients with Ⅳ genotype than Ⅱ genotype with statistical difference (P<0.05). Conclusions Ⅱ and Ⅳ genotypes are dominant in the I474V polymorphism loci of PCSK9 gene. The genotype of PCSK9 gene I474V polymorphism is correlated with serum increasing levels of TC and TG and the severity of coronary lesions in CAD patients.

Key words: Proprotein convertase subtilisin lkexin type 9, I474V polymorphism, gene, Coronary artery disease