Genomic features of an Escherichia coli ST156 strain harboring chromosome-located mcr-1 and plasmid-mediated blaNDM-5

被引:10
作者
Lin, Yanfeng [1 ,2 ]
Yang, Lang [1 ,2 ]
Lu, Lanfen [3 ]
Wang, Kaiying [1 ,2 ]
Li, Jinhui [2 ]
Li, Peihan [1 ,2 ]
Liu, Yuqi [1 ,2 ]
Liu, Xuelin [2 ]
Li, Peng [2 ]
Song, Hongbin [2 ]
机构
[1] Acad Mil Med Sci, Beijing, Peoples R China
[2] Ctr Dis Control & Prevent PLA, 20 DongDa St, Beijing 100071, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Zhongshan Hosp, Dept Lab Diag, Zhongshan, Peoples R China
关键词
MCR; Multidrug resistance; Colistin resistance; Horizontal transfer; RESISTANT ENTEROBACTERIACEAE; EMERGENCE; NDM-5; DISSEMINATION; PREVALENCE; GENE;
D O I
10.1016/j.meegid.2020.104499
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
The emergence of Escherichia coli strains coharboring the bla(NDM) and mcr genes has become a new challenge in clinical therapy because of their resistance to most antibiotics. This study reports the emergence of an E. coli strain GZEC065 isolated from blood sample of a patient in China with both chromosome-located mcr-1 and plasmid-mediated bla(NDM-5) genes. Antimicrobial susceptibility testing showed that GZEC065 was resistant to most tested antimicrobials, including imipenem and polymyxin B. S1-nuclease-pulsed-field gel electrophoresis, Southern blotting analysis and conjugation assay was performed to determine the location and conjugative ability of mcr-1 and bla(NDM-5) genes. Whole genome sequencing and analysis showed that GZEC065 belonged to sequence type ST156 and contained three different plasmids (46 kb, 88 kb and 142 kb) with multiple resistance genes, such as mcr-1, bla(NDM-5) and bla(TEM-1). The blaNDM-5 gene was carried by the 46 kb conjugative IncX3 plasmid, which has been reported frequently in China. The mcr-1 gene was located on the chromosome mediated by the Tn6330 mobile element and showed genetic complexity among different strains. The emergence of E. coli strains coharboring both chromosome-located mcr-1 and plasmid-mediated bla(NDM-5) genes highlights the urgent need for alternative antibiotic treatment and continuous active surveillance.
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页数:5
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