Aono Akio, Chikamatsu Kinuyo, Yamada Hiroyuki, Kato Tomoko, Mitarai Satoshi
Department of Mycobacterium Reference and Research, The Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, Kiyose, Japan
Department of Mycobacterium Reference and Research, The Research Institute of Tuberculosis, Japan Anti-Tuberculosis Association, Kiyose, Japan.
Antimicrob Agents Chemother. 2014 Aug;58(8):4928-30. doi: 10.1128/AAC.02394-14. Epub 2014 May 27.
We determined MICs for, confirmed the presence of pncA mutations in, and performed pyrazinamidase testing on colonies (subclones) obtained from seven isolates that exhibited differential pyrazinamide (PZA) susceptibility. Six of the seven strains were found to exhibit characteristics resulting from the mixture of strains possessing different properties. In addition, our analysis revealed large pncA-spanning deletions (1,565 bp, 4,475 bp, and 6,258 bp) in three strains that showed high PZA resistance.
我们测定了七株对吡嗪酰胺(PZA)敏感性不同的分离株所获得的菌落(亚克隆)的最低抑菌浓度(MIC),确认了其中pncA突变的存在,并对其进行了吡嗪酰胺酶测试。七株菌株中有六株表现出具有不同特性的菌株混合所产生的特征。此外,我们的分析揭示了三株对PZA高度耐药的菌株中存在跨越pncA的大片段缺失(分别为1,565 bp、4,475 bp和6,258 bp)。