应用实时荧光PCR分析apoE3、4等位基因

目的 建立实时荧光PCR进行apoE单核苷酸多态性(SNP)分析法,快速检测人栽脂蛋白E(apoE)等位基因.方法 以人apoE基因中的Cys112Arg为研究对象,用荧光染料SYBR Green Ⅰ标记PCR产物,通过熔解曲线分析结果,并进行SNP分型.用高保真DNA聚合酶提高SNP测定的特异性;通过DNA测序验证荧光定量PCR对apoE基因Cys112Arg分型结果的准确性.结果 每个样品设立2个检测管,利用下游引物P2和SNP检测引物P33、P44进行定量PCR反应,30份样品各自获得2种等位基因扩增产物的熔解曲线,通过熔解曲线的Tm值判读,在30份样本中,apoE基因型3/3、3/4分别有27例和3例,与PCR-RFLP及DNA测序结果一致.结论 建立的apoE等位基因分型法操作简便,结果准确,适合人外周血apoE等位基因的定性检测.

ApoE genotyping by real-time fluorescence PCR

Objective To establish a new effective method by using real-time polymerase chain reaction (PCR) to detect single nucleotide polymorphism (SNP) typing for rapid identifying apolipoprotein E alleles.Methods To determine alleles of human apolipoprotein E genetic polymorphism at Cys112Arg locus was detected by PCR melting curve analysis with fluorophore SYBR Green I. In order to increase the speciality of SNP assays, high fidelity Taq polymerase was used. The reliability of SNP typing was validated by comparison with the results of direct DNA sequencing.Results Each sample was determined by double tubes, and two melting curves were analysis. As compared the Tm value of samples with the Tm of standard substance, the apoE genotype of samples was determined. The apoE genotype of 30 samples were E3/3 (27/30) and E3/4 (3/30) respectively, which was accordant with the results of PCR-RFLP and DNA sequencing.Conclusion The presented allelic assay was specific, easy to operate and applicable for discrimination of apolipoprotein E genotyping of human blood.