期刊
VETERINARY MICROBIOLOGY
卷 254, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.vetmic.2021.108983
关键词
ISApl1; Composite transposon; mcr-1; Pasteurellaceae; Antibiotic resistance
资金
- Shanghai Rising-Star Program [19QA1411200]
- National Natural Science Foundation of China [31672606]
This study characterized a mcr-1-carrying ICE in a novel Pasteurellaceae-like bacteria of swine origin. The novel ICE structure and diverse composite transposons mediated by multicopy IS elements may facilitate the dissemination of different resistance genes.
The aim of this study was to characterize a mcr-1-carrying integrative and conjugative element (ICE) in a novel Pasteurellaceae-like bacteria of swine origin. The mcr-1-positive GY-402 strain, recovered from a pig fecal sample, was subjected to whole genome sequencing with the combination of Illumina Hiseq and MinION plat-forms. Genome-based taxonomy revealed that strain GY-402 exhibited highest ANI value (84.89 %) to Actino-bacillus succinogenes, which suggested that it represented a novel Actinobacillus species. Sequence analysis revealed that mcr-1 was clustered with eight other resistance genes in the MDR region of a novel ICE element, named ICEAsp1. Inverse PCR and mating assays showed that ICEAsp1 is active and transferrable. In addition, six circular forms mediated by four ISApl1 elements were detected with different inverse PCR sets, indicating that flexible composite transposons could be formed by pairwise combinations of multiple IS copies. Cloning experiment and phylogenetic analysis revealed that the novel Cat protein, designated CatT, belongs to type-A family and confers resistance to chloramphenicol. In conclusion, this is, to the best of our knowledge, the first report of mcr-1 gene on ICE structure and also in Pasteurellaceae bacteria. The diverse composite transposons mediated by multicopy IS elements may facilitate the dissemination of different resistance genes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据