期刊
POULTRY SCIENCE
卷 100, 期 5, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.psj.2021.101074
关键词
multidrug-resistance; shufflon region; mcr-1; bla(CTX-M-type); IS26
资金
- National Natural Science Foundation of China [31772800]
The transmission characteristics of mcr-1 and bla(CTX-M-type) in the LWY24 isolate are influenced by clonal spread of ST93, selective pressure of cefotaxime, IS26-mediated homologous recombination and transposition, as well as the specific shufflon region. The study also showed that the mcr-1 and bla(CTX-M-55) carrying plasmids could be co-transferred at a similar frequency under selection pressure, indicating potential horizontal transfer mechanisms.
This study was undertaken to discern the transmission characteristics of mcr-1 and bla(CTX-M-type) in one multidrug-resistant Escherichia coli LWY24 from chicken in China. The genetic profiles of LWY24 isolate were determined by conjugation, S1-pulsed-field gel electrophoresis, southern blot hybridization, and whole genome sequencing analysis. Meanwhile, co-transfer of plasmids in LWY24 isolate was screened by dual conjugation assays. The LWY24 isolate was identified as ST93, and harbored 3 conjugative plasmids, pLWY24J-3 (bla(CTX-M-55)-bearing IncFII), pLWY24Jmcr-1 (mcr-the 4 plasmids, suggesting that horizontal transmission have occurred by plasmid mating, homologous recombination, and transpositions. Under the selection pressure of cefotaxime and colistin or cefotaxime alone, the mcr-1-bearing plasmid and the bla(CTX-M-55)-harboring plasmid could be co-transferred at a similar frequency, with 8.00 x 10 (4) or 9.00 x 10 (4) transconjugants per donor cell, respectively. The specific shufflon region in mcr-1-encoding plasmid could generate up to 6 diverse PilV structures, which may further accelerate the horizontal transfer of plasmid. In conclusion, the transmission characteristics of mcr-1 and bla(CTX-M-type) in LWY24 isolate could due to clonal spread of ST93, selective pressure of cefotaxime, IS26-mediate homologous recombination and transposition, and the specific shufflon region.1-carrying IncI2), and pLWY24J-4 (nonresistance-conferring IncI1), and one nonconjugative plasmid pLWY24 (bla(CTX-M-14)-containing IncHI2/ IncHI2A). Numerous resistance genes, insertion sequences (especially IS26), and transposons were found in
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