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Nucleotide sequences of 16 transmissible plasmids identified in nine multidrug-resistant Escherichia coli isolates expressing an ESBL phenotype isolated from food-producing animals and healthy humans

Wang, Juan ; Stephan, Roger ; Power, Karen ; Yan, Qiongqiong ; Hächler, Herbert ; Fanning, Séamus

In: Journal of Antimicrobial Chemotherapy, 2014, vol. 69, no. 10, p. 2658-2668

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    Titel
    • Nucleotide sequences of 16 transmissible plasmids identified in nine multidrug-resistant Escherichia coli isolates expressing an ESBL phenotype isolated from food-producing animals and healthy humans
    Autor
    • Wang, Juan. UCD Centre for Food Safety, School of Public Health, Physiotherapy & Population Science, University College Dublin, Belfield, Dublin 4, Ireland
    • Stephan, Roger. Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 272, CH-8057 Zurich, Switzerland
    • Power, Karen. UCD Centre for Food Safety, School of Public Health, Physiotherapy & Population Science, University College Dublin, Belfield, Dublin 4, Ireland
    • Yan, Qiongqiong. UCD Centre for Food Safety, School of Public Health, Physiotherapy & Population Science, University College Dublin, Belfield, Dublin 4, Ireland
    • Hächler, Herbert. Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 272, CH-8057 Zurich, Switzerland
    • Fanning, Séamus. UCD Centre for Food Safety, School of Public Health, Physiotherapy & Population Science, University College Dublin, Belfield, Dublin 4, Ireland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Journal of Antimicrobial Chemotherapy, 2014, vol. 69, no. 10, p. 2658-2668. Oxford University Press
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:301850
    Summary
    Objectives Nine extended-spectrum β-lactamase (ESBL)-producing Escherichia coli isolated from healthy humans and food-producing animals were found to transfer their cefotaxime resistance marker at high frequency in laboratory conjugation experiments. The objective of this study was to completely characterize 16 transmissible plasmids that were detected in these bacterial isolates. Methods The nucleotide sequences of all 16 plasmids were determined from transconjugants using next-generation sequencing technology. Open reading frames were assigned using Rapid Annotation using Subsystem Technology and analysed by BLASTn and BLASTp. The standard method was used for plasmid multilocus sequence typing (pMLST) analysis. Plasmid structures were subsequently confirmed by PCR amplification of selected regions. Results The complete circularized nucleotide sequence of 14 plasmids was determined, along with that of a further two plasmids that could not be confirmed as closed. These ranged in size from 1.8 to 166.6 kb. Incompatibility groups and pMLSTs identified included IncI1/ST3, IncI1/ST36, IncN/ST1, IncF and IncB/O, and those of the same Inc types presented a similar backbone structure despite being isolated from different sources. Eight plasmids contained blaCTX-M-1 genes that were associated with either ISEcp1 or IS26 insertion sequence elements. Six plasmids isolated from humans and chickens were identical or closely related to the IncI1 reference plasmid, R64. Conclusions These data, based on comparative sequence analysis, highlight the successful spread of blaESBL-harbouring plasmids of different Inc types among isolates of human and food-producing animal origin and provide further evidence for potential dissemination routes