目的初步分析福建耐多药结核病(multi-resistant tuberculosis,MDR-TB)临床分离结核分枝杆菌利福平和异烟肼的耐药相关基因突变情况。方法自福建福州肺科医院收集耐多药结核分枝杆菌临床分离菌株,采用PCR测序技术测定利福平和异烟肼耐药相关基因,包括rpoB、katG、inhA和mabA-inhA,并与标准菌株基因序列比对,分析基因突变特点。结果共对67株MDR-TB菌株进行了分析,91.04%的菌株在rpoB81 bp RRDR区发生突变,其中,88.06%(59/67)的MDR-TB菌株在rpoB531、526和516位发生突变;79.10%的菌株在katG、inhA或mabA-inhA上发生突变,59.70%(40/67)的菌株在katG315或者mabA-inhA(-15)位发生突变,没有检测到同时在inhA结构基因和基因调节区发生突变的菌株。结论 PCR-DNA测序分析技术可以用于检测MDR-TB临床分离菌株对RFP和INH的药物敏感性。
Objective To identify the novel species ‘Mycobacterium fukienense' sp. nov of Mycobacterium chelonae/abscessus complex from tuberculosis patients in Fujian Province, China. Methods Five of 27 clinical Mycobacterium isolates(Cls) were previously identified as M. chelonae/abscessus complex by sequencing the hsp65, rpoB, 16S-23S rRNA internal transcribed spacer region(its), recA and sodA house-keeping genes commonly used to describe the molecular characteristics of Mycobacterium. Clinical Mycobacterium isolates were classified according to the gene sequence using a clustering analysis program. Sequence similarity within clusters and diversity between clusters were analyzed. Results The 5 isolates were identified with distinct sequences exhibiting 99.8% homology in the hsp65 gene. However, a complete lack of homology was observed among the sequences of the rpoB, 16S-23S rRNA internal transcribed spacer region(its), sodA, and recA genes as compared with the M. abscessus. Furthermore, no match for rpoB, sodA, and recA genes was identified among the published sequences. Conclusion The novel species, Mycobacterium fukienense, is identified from tuberculosis patients in Fujian Province, China, which does not belong to any existing subspecies of M. chelonea/abscessus complex.
ZHANG Yuan YuanLI Yan BingHUANG Ming XiangZHAO Xiu QinZHANG Li ShuiLIU Wen EnWAN Kang Lin
