高密度脂蛋白代谢相关基因单核苷酸多态性研究

目的探讨中国人群高密度脂蛋白代谢相关基因单核苷酸多态性(singlenucleotidepolymorphism,SNP)的分布特征。方法对象选自中国西部5省区健康汉族个体209人,男132名、女77名,平均年龄(59±10)岁。以蛋白酶K消化、苯酚及氯仿抽提以及异丙醇沉淀的方法提取全基因组DNA。应用聚合酶链反应、限制性内切酶片段长度多态性结合测序的方法检测ATP结合盒转运体(ATP-bindingcassettetransporter,ABCA1)、胆固醇酯转运蛋白(cholesteryleastertransferprotein,CETP)以及脂蛋白脂酶(lipoproteinlipase,LPL)等高密度脂蛋白代谢相关基因SNP。结果该研究群体等位基因ABCA1-A和G的基因频率分别为53.4%和46.6%;CETP-B1和B2分别为59.0%和41.0%;LPL-H(-)和LPL-H(+)分别为18.9%和81.1%;LPL-P(+)和LPL-P(-)分别为66.0%和34.0%,符合Hardy-Weinberg平衡定律。LPL基因多态位点Hind(+)与Pvu(+)之间存在显著的连锁不平衡。将性别因素作分层分析提示CETPTaq1B基因型频率存在明显的性别差异(χ2=9.94,P=0.0075)。测序表明上述限制性内切酶片段长度多态性均系内切酶识别区域内的单核苷酸碱基替换。中国人种与白人种基因多态性分布频率对照研究发现,CETP-Taq1B等位基因频率接近,而其余3种等位基因频率分布存在显著性差异。结论中国汉族人

Single nucleotide polymorphisms of genes associated with high density lipoprotein metabolism in Chinese population

OBJECTIVE: To study the single nucleotide polymorphisms in genes associated with the high density lipoprotein (HDL) metabolism in Chinese population. METHODS: Two hundred and nine normal Han ethnic subjects, aged 59+/-10 years, were recruited from 5 medical centers in western part of China. DNA was extracted by proteinase K digestion, phenol and chloroform extraction as well as isopropanol precipitation. The polymerase chain reaction (PCR)-restriction fragment length polymorphisms (RFLP) in conjunction with sequencing were employed to test the single nucleotide polymorphisms (SNPs) in ATP-binding cassette transporter (ABCA1), cholesteryl ester transfer protein (CETP) and lipoprotein lipase (LPL) genes. RESULTS: The allelic frequencies of A and G of ABCA1 gene are 53.4% and 46.6%; of B2 and B1 allele of CETP, 41.0% and 59.0%; of HindIII (-) and (+) allele of LPL, 18.9% and 81.1%; and of PvuII(+) and (-) allele of LPL, 66.0% and 34.0%, respectively. All genotype frequencies fit well with the Hardy-Weinberg equilibrium; the significant linkage disequilibrium exists between LPL HindIII(+)and PvuII(+) polymorphisms. All of the RFLP in these genes result from the single nucleic substitution in fragment recognized by corresponding restriction enzymes. CONCLUSION: The genetic polymorphisms of ABCA1, LPL-HindIII and LPL-PvuII in Chinese Han ethnic population are significantly different from Caucasians residing in USA or Europe.