Fate of CMY-2-encoding plasmids introduced into the human fecal microbiota by exogenous Escherichia coli

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

DOI

  • Author: Anjum, Mehreen

    University of Copenhagen, Denmark

  • Author: Madsen, Jonas Stenløkke

    University of Copenhagen, Denmark

  • Author: Nesme, Joseph

    University of Copenhagen, Denmark

  • Author: Jana, Bimal

    University of Copenhagen, Denmark

  • Author: Wiese, Maria

    University of Copenhagen, Denmark

  • Author: Jasinskytė, Džiuginta

    University of Copenhagen, Denmark

  • Author: Nielsen, Dennis Sandris

    University of Copenhagen, Denmark

  • Author: Sørensen, Søren Johannes

    University of Copenhagen, Denmark

  • Author: Dalsgård, Anders

    University of Copenhagen, Denmark

  • Author: Moodley, Arshnee

    University of Copenhagen, Denmark

  • Author: Bortolaia, Valeria

    Research group for Genomic Epidemiology, National Food Institute, Technical University of Denmark, Kemitorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Guardabassi, Luca

    Royal Veterinary College, United Kingdom

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The gut is a hot spot for transfer of antibiotic resistance genes from ingested exogenous bacteria to the indigenous microbiota. The objective of this study was to determine the fate of two nearly identical bla CMY-2-harboring plasmids introduced into the human fecal microbiota by two Escherichia coli strains isolated from human and poultry meat, respectively. The chromosome and the CMY-2-encoding plasmid of both strains were labeled with distinct fluorescent markers (mCherry and GFP), allowing Fluorescence Activated Cell Sorting (FACS)-based tracking of the strain and the resident bacteria that have acquired its plasmid. Each strain was introduced into an established in vitro gut model (CoMiniGut) inoculated with individual feces from ten healthy volunteers. Fecal samples collected 2, 6 and 24 h after strain inoculation were analyzed by FACS and plate counts. Although the human strain survived better than the poultry meat strain, both strains transferred their plasmids to the fecal microbiota at concentrations as low as 102 CFU/mL. Strain survival and plasmid transfer varied significantly depending on inoculum concentration and individual fecal microbiota. Identification of transconjugants by 16S rRNA gene sequencing and MALDI-TOF mass spectrometry revealed that the plasmids were predominantly acquired by Enterobacteriaceae such as E. coli and Hafnia alvei. Our experimental data demonstrate that exogenous E. coli of human or animal origin can readily transfer CMY-2-encoding IncI1 plasmids to the human fecal microbiota. Low amounts of exogenous strain are sufficient to ensure plasmid transfer if the strain is able to survive the gastric environment.
Original languageEnglish
Article numbere02528
JournalAntimicrobial Agents and Chemotherapy
Volume63
Issue number5
Number of pages13
ISSN0066-4804
DOIs
Publication statusPublished - 2019
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • CoMiniGut model, Escherichia coli, Incl1, Cephalosporin

ID: 171072535