【摘要】 目的　探讨快速检测rpoB基因突变的敏感方法 ,以期建立适合我国国情的结核分支杆菌耐药株的快速检测手段。方法　根据结核分支杆菌野生株序列 ,自行设计覆盖rpoB基因核心突变区的系列寡核苷酸探针并将其固定在尼龙膜上 ,然后应用生物素标记的特异性引物扩增包含核心突变区的rpoB基因片段 ,与固定在膜上的寡核苷酸探针杂交 ,对突变位点进行快速检测 ,并与药敏试验及DNA测序结果进行比较。结果　应用反向斑点杂交法检测 36株耐药株和 2 2株敏感株rpoB基因的突变位点 ,并据此判断其对利福平的药敏特性 ,结果敏感性为 88.9% ,特异性为 86 .4 % ,药敏结果符合率为 87.9% ,与测序结果的符合率为 89.7%。结论　反向斑点杂交法可以快速、敏感地检测rpoB基因突变 ,进而早期判断结核分支杆菌对利福平的药敏特性。更多还原

【Abstract】 Objective To develop new method for rapid detection of mutations in rpoB gene related with resistance to rifampin of M. tuberculosis . Methods According to the sequence of wild type M. tuberculosis, five oligonucleotide probes covering the 69 bp hyper variable region of rpoB gene were designed and immobilized on nylon membrane strips. Thereafter, the target rpoB gene fragment was obtained by PCR using biotin labeled primers and thereafter the PCR product was denatured and hybridized with probes on membrane. The results of reverse dot blot hybridization were compared with the results of drug sensitivity test and sequencing. Results PCR products from 36 RFP resistant and 22 RFP susceptible isolates were detected by the assay of reverse dot blot hybridization, showing that the susceptibility and the specificity rate were 88.9% and 86.4% respectively,and the coincidence with biochemical method and sequencing is 87.9% and 89.7% respectively. Conclusions Reverse dot blot hybridization is a rapid and sensitive method to detect the rpoB gene mutations,which may be used in early detection of the resistance of M. tuberculosis to rifampin.更多还原