实时荧光定量PCR检测外周血TREC的方法研究

目的建立及优化检测移植后患者外周血TREC拷贝数的实时荧光定量PCR（FQ-PCR）的方法及实验影响条件，为临床研究造血干细胞移植的免疫功能重建机制提供方法学基础。方法在ABI7000 PCR仪上实时扩增检测构建的TREC质粒标准品，摸索最佳扩增条件及建立标准曲线，然后用优化的FQ-PCR方法检测临床样本。结果T3、T4引物和R3、R4引物的扩增效率分别优于T1、T2引物和R1、R2引物。TaqMan-MGB探针比普通的TaqMan探针扩增效率高。金牌热启动Taq酶，比较普通Taq酶而言。提高了PCR的特异性和敏感性。FQ-PCR的反应条件设定：95℃10min后95℃5s，53℃30s，40循环结束。结论通过摸索与优化实验条件，建立了实时荧光定量PCR检测外周血单个核细胞中TREC的方法。

Real-time fluorescent quantitative PCR for detection of peripheral blood T-cell receptor excision circles

OBJECTIVE: To develop and optimize real-time fluorescence quantitative PCR (FQ-PCR) with the housekeeping gene RAG2 as cell number control to quantify T-cell receptor excision circle (TREC) in the peripheral blood. METHODS: The real-time PCR system for amplifying TREC and RAG2 genes was established on the basis of ABI 7000 apparatus using Golden Taq system, designed primers, TaqMan-MGB probes and optimized buffer. PCR conditions were optimized with standard samples of TREC plasmid. RESULTS: The amplification with the primer pair T(3) and T(4) was more efficient than that with T(1) and T(2). More specific and efficient amplification in FQ-PCR was achieved using TaqMan-MGB probes as compared with general Taq-Man probes. Golden Taq was more effective than general Taq in improving the specificity and decreasing the artifact, and 95 degrees C; for 10 min, 95 degrees C; for 5 s, and 53 degrees C; for 30 s for a total of 40 cycles using ABI7000 was found as the optimized thermal parameter setting. CONCLUSION: An optimized real-time PCR protocol for detecting TREC in peripheral blood mononuclear cells is established.