载脂蛋白E基因多态性与老年性痴呆、老年冠心病关系的研究

Correlation Between Apolipoprotein E Gene Polymorphism and Alzheimer and Coronary Heart Disease

目的 研究载脂蛋白 (Apo)E基因多态性与老年性痴呆 (AD)和老年冠心病 (CHD)之间的相关关系。方法 对 3 3例AD和 3 7例CHD患者应用聚合酶链—限制性片段长度多态性 (PCR -RFLP)方法先扩增出ApoE基因第 4外显子内的 2 2 7bp片段继以限制性内切酶CfoI酶解消化 ,8%聚丙烯酰胺凝胶电泳 ,最后银染显带判定基因型 ,并计算等位基因频率。结果 AD患者的ApoEε4等位基因频率显著高于健康对照 (P <0 0 1)。ApoE基因多态与老年CHD间未发现关联。

Objective Apolipoprotein E(ApoE) gene polymorphism and alzheimer and coronary heart disease was studied ,and the correlation between them was evaluated.Methods The polymerase chain reaction-restriction fragment length polymorphism was used to amply 227 base-pari DNA fragment in the fourth exon of ApoE gene,and digested them with restriction enzyme CfoI,electrophoresis on 8% polyacrylamaid gel for the cleavaged products,subsequently genotype was determined by silver staining and allele frequencies were counted.Results apoE genotype and allele frequencies was detected in 33 case with Alzheimer and 37 case with coronary heart disease.The results showed that the frequencies of ApoE ε 4 was significantly higher than that in age-matched controls(P<0 01).No correlation was found between ApoE polymorphism and coronary heart disease.Conclusions The results suggest that ApoE ε 4 may be a latent risk factor in the pathogenesis of AD.