应用实时荧光定量PCR技术分析UGT1A1基因启动子区A(TA)_nTAA多态性

目的建立实时荧光定量聚合酶链反应(PCR)技术检测尿苷二磷酸葡糖醛酸基转移酶1A1(UGT1A1)基因启动子区A(TA)_nTAA序列多态性的方法。方法以16例Gilbert综合征患者和66例健康对照个体为研究对象,抽提基因组DNA,通过DNA测序确定UGT1A1基因启动子区A(TA)_nTAA序列多态性。同时,设计1对引物和2条TaqMan MGB探针,2条探针的5′端分别标记FAM和VIC染料,探针的3′端则均以MGB修饰。使用实时荧光定量PCR方法扩增并检测研究对象的UGT1A1基因启动子区A(TA)_nTAA多态性序列,与测序法比较,验证实时荧光定量PCR方法的灵敏度和特异度。结果应用荧光定量PCR技术检测,16例Gilbert综合征患者的UGT1A1基因启动子区A(TA)_nTAA多态性序列均为A(TA)7TAA,46例健康对照个体A(TA)_nTAA多态性序列为A(TA)6TAA,其余20例健康对照个体A(TA)_nTAA多态性序列为A(TA)6TAA/A(TA)7TAA杂合多态性。上述结果与DNA测序结果完全一致。结论通过实时荧光定量PCR技术检测UGT1A1基因启动子区A(TA)_nTAA序列多态性的方法具有灵敏度高、特异度强及操作简单等特点,可在临床推广应用。

Analysis on A(TA)n TAA polymorphism of UGT1A1 gene promoter by fluorescence real-time quantitative PCR

Objective To develop a new method to detect A (TA)n TAA polymorphism in the UGT1A1 gene promoter by fluo‐rescence real‐time quantitative PCR (RQ‐PCR) .Methods Genomic DNA was extracted from peripheral blood in 16 patients with Gilbert′s syndrome and 66 healthy individuals .The polymorphic A(TA)n TAA sequence in the UGT1A1 gene promoter was deter‐mined by DNA sequencing .A pair of primers and two TaqMan probes labeled with either 5′FAM or VIC reporter dye incorporated a 3′minor groove binder were designed .The A(TA)n TAA polymorphisms in the UGT1A1 gene promoter were identified by RQ‐PCR for all research subjects .The sensitivity and specificity of RQ‐PCR for detecting the A(TA)nTAA polymorphisms were veri‐fied by DNA sequencing method .Results The homozygous A(TA)7TAA polymorphism was found in the promoter region of the UGT1A1 gene in all 16 patients with Gilbert′s syndrome by using RQ‐PCR .The homozygous A(TA)6TAA polymorphism was foundin46healthysubjects,whiletheheterozygousA(TA)6TAA/A(TA)7TAApolymorphismwasfoundinother20healthysub‐jects .All A(TA)nTAA polymorphisms in the promoter region of the UGT1A1 gene identified by RQ‐PCR were consistent with that of DNA sequencing .Conclusion It is a sensitive ,specific and simple method to detect the A (TA)n TAA polymorphisms in the promoter region of the UGT1A1 gene by RQ‐PCR ,which can be promoted and applied in clinic .