Objective To establish a LNA-taqman-based real-time PCR assay for detecting gene polymorphisms of Vitamin K monooxygenase CYP4F2,vitamin K epoxide reductase complex subunit 1(VKORC1)and cytochrome P450 2C9(CYP2C9), associated with Warfarin optimal dosage.Methods A set of allele-specific PCR primers and probes was designed for each single nucleotide polymorphism(SNP)of CYP4F2-1347C>T,CYP2C9*3,VKORC1-1173C>T and VKORC1-1639G>A, and the specificity of LNA-taqman probe PCR was evaluated.Genomic DNA of peripheral blood samples from 150 patients with treated with warfarin was extracted,and the some PCR products were verified with sequencing.Results ①LNA-taq-man-based real-time PCR assay was highly specificity,no overla.②Among the 150 patients,the cases of CC,CT and TT genotype of CYP4F2-1347C>T were 87(58%),56(37.3%)and 7(4.7%).The cases of *1/*1 and *1/*3 genotype of CYP2C9*3 were 142(94.7%)and 8(5.3%),*3/*3 genotype was not detected.The cases of TT,TC and CC genotype of VKORC1 1173C>T were 127(84.7%),20(13.3%)and 3(2%).The cases of AA,AG and GG genotype of VKORC1 1639G>A were 124(82.7%),23(15.3%)and 3(2%),respectively.Conclusion The LNA-taqman-based real-time PCR as-say is convenient,inexpensive,accurate and will be useful for CYP4F2-C1347T,CYP2C9* 3,VKORC1-C1173T and VKORC1-G1639A genotyping in a clinic laboratory.%目的 建立一种基于 LNA-taqman探针实时荧光PCR检测华法林剂量相关基因型维生素 K单氧酶 CYP4F2,维生素K环氧化物还原酶复合体亚单位1(VKORC1)和细胞色素 P4502C9(CYP2C9)的方法.方法 针对 CYP4F2-1347C>T,CYP2C9*3,VKORC1-1173C>T与 VKORC1-1639G>A四个单核苷酸多态性(SNP)位点,分别设计一套等位基因特异性探针与引物,并对LNA-taqman探针特异性进行评价.提取150例接受华法林治疗患者外周血样本基因组DNA进行检测,同时对部分实时荧光 PCR产物样品进行验证.结果 ①LNA-taqman探针检测方法特异性高,没有交叉性.②150例患者中,CYP4F2-1347C>T基因型CC,CT和TT分别有87,56和7例,各占58%,37.3%和4.7%;CYP2C9*3基因型*1/*1和*1/*3分别有142和8例,各占94.7%和5.3%,未检出纯合子*3/*3基因型;VKORC1-1173C>T基因型TT,TC和CC分别有127,20和3例,各占84.7%,13.3%和2%;VKORC1-1639G>A基因型AA,AG和GG分别有124,23和3例,各占82.7%,15.3%和2%.结论 基于 LNA-taqman探针的实时荧光PCR分型方法具有操作简便,价格低廉,结果准确可靠等特点,适于临床实验室对CYP4F2,CYP2C9*3,VKORC1的基因分型.
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