Fitness Advantage of mcr-1-Bearing IncI2 and IncX4 Plasmids in Vitro
文献类型: 外文期刊
第一作者: Wu, Renjie
作者: Wu, Renjie;Yi, Ling-xian;Yu, Lin-feng;Wang, Jing;Liu, Yiyun;Chen, Xiaojie;Lv, Luchao;Yang, Jun;Liu, Jian-Hua;Chen, Xiaojie
作者机构:
关键词: Escherichia coli;mcr-1;colistin;plasmid;fitness
期刊名称:FRONTIERS IN MICROBIOLOGY ( 影响因子:5.64; 五年影响因子:6.32 )
ISSN: 1664-302X
年卷期: 2018 年 9 卷
页码:
收录情况: SCI
摘要: The objective of this study was to assess the impact of diverse plasmids bearing colistin resistance gene mcr-1 on host fitness. Forty-seven commensal E. coli isolates recovered from the pig farm where mcr-1 was first identified were screened for mcr-1. mcr-1-bearing plasmids were characterized by sequencing. The fitness impact of mcr-1-bearing plasmids was evaluated by in vitro competition assays. Twenty-seven (57.5%) E. coli isolates were positive for mcr-1. The mcr-1 genes were mainly located on plasmids belonging to IncI2 (n = 5), IncX4 (n = 11), IncHI2/ST3 (n = 8), IncFII (n = 2), and IncY (n = 2). InHI2 plasmids also carried other resistance genes (floR, blaCTX-M, and fosA3) and were only detected in isolates from nursery pigs. Sequences of the representative mcr-1-bearing plasmids were almost identical to those of the corresponding plasmid types reported previously. An increase in the fitness of IncI2- and IncX4-carrying strains was observed, while the presence of IncHI2, IncFII and IncY plasmids showed a fitness cost although an insignificant fitness increase was initially observed in IncFII or IncY plasmids-containing strains. Acquisition of IncI2-type plasmid was more beneficial for host E. coli DH5 alpha than either IncHI2 or IncX4 plasmid, while transformants with IncHI2-type plasmid presented a competitive disadvantage against IncI2 or IncX4 plasmid containing strains. In conclusion, IncI2, IncX4, and IncHI2 were the major plasmid types driving the dissemination of mcr-1 in this farm. Increased fitness or co-selection by other antimicrobials might contribute to the further dissemination of the three epidemic mcr-1-positive plasmids (IncI2, IncX4, and IncHI2) in this farm and worldwide.
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