Journal
FOOD CONTROL
Volume 137, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2022.108937
Keywords
Foodborne E. coli; Ciprofloxacin; Carbapenem; Colistin; Plasmid
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Funding
- Basic Research Fund of Shenzhen
- National Key R&D Program of China [2018YFD0500300]
- Education Department of Scientific Research Project of Hunan Province [21C0147]
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Multiple plasmids carrying resistance genes were found in a multidrug resistant E. coli strain. One plasmid had a resistance region of 17.3kb and a transfer region of 56.7kb. Another plasmid resembled the backbone of other IncI2 plasmids and contained multiple functional genes.
Multidrug resistant (MDR) Escherichia coli poses great threat to human and animal health. To investigate the genetic characteristics of conjugative plasmids that encode ciprofloxacin, carbapenem and colistin resistance in a MDR E. coli strain (974) isolated from pork samples in China, the E. coli strain 974 was subjected to conjugation study, S1-PFGE, Southern hybridization and was sequenced by Illumina Nextseq 500 and MinION Platforms. The ciprofloxacin-resistance-encoding plasmid, p974-IncF, was found to harbor multiple mobile elements that in turn contain genes resistant to beta-lactams, quinolone, florephenicol, tetracycline, aminoglycosides, sulfonamides, streptomycin, trimethoprim and chloramphenicol. The backbone of blaNDM-1-bearing plasmid, p974-NDM, was found consist of a 17.3kb resistance region and a 56.7kb of transfer region. However, the classical ISCR1 mobile element and class I integron were missing in plasmid p974-NDM. Resembling the backbone of other IncI2 plasmids, the mcr-1-bearing plasmid, p974-MCR, contained genes that encode replication function, plasmid stability, proteins related to type IV secretion complex, as well as two pilus-encoding genes, which are conserved among all IncI2 plasmids. Enhanced surveillance efforts and limitation of usage of antibiotics are urgently warranted to control the dissemination of these resistance determinants.
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