Molecular diversity and conjugal transferability of class 2 integrons among escherichia coli isolates from food, animal and human sources

  1. Alonso C.A. 1
  2. Cortés-Cortés G 3
  3. Maamar E 4
  4. Massó M 2
  5. Rocha-Gracia R.D.C 3
  6. Torres C 1
  7. Centrón D 2
  8. Quiroga M.P. 2
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Universidad de Buenos Aires
    info

    Universidad de Buenos Aires

    Buenos Aires, Argentina

    ROR https://ror.org/0081fs513

  3. 3 Benemérita Universidad Autónoma de Puebla
    info

    Benemérita Universidad Autónoma de Puebla

    Heróica Puebla de Zaragoza, México

    ROR https://ror.org/03p2z7827

  4. 4 Université de Tunis El Manar
    info

    Université de Tunis El Manar

    Túnez, Túnez

    ROR https://ror.org/029cgt552

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Revista:
International Journal of Antimicrobial Agents

ISSN: 0924-8579

Año de publicación: 2018

Tipo: Artículo

DOI: 10.1016/J.IJANTIMICAG.2018.02.001 PMID: 29428457 SCOPUS: 2-s2.0-85048486252 GOOGLE SCHOLAR

Otras publicaciones en: International Journal of Antimicrobial Agents

Repositorio institucional: lock_openAcceso abierto Postprint

Proyectos relacionados

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2016/00153/001

Resumen

Integrons are genetic platforms able to excise, integrate and express antibiotic resistance gene cassettes. Here, we investigate the complete genetic organization, genetic environment, location and conjugative transferability of a collection of class 2 integrons carried by E. coli strains from different sources (poultry/pork-meat, animals, and humans). PCR cartography was conducted to determine the genetic arrangement of the integrons, their physical linkage to Tn7 and the chromosomal insertion at attTn7 site. Clonal relatedness of specific isolates was determined by MLST and OD-PCR. Transferability of class 2 integrons was tested by conjugation and the resulting transconjugants were characterized by antimicrobial resistance genotyping, S1-PFGE and replicon typing. Although a limited diversity of gene cassettes was shown, a high percentage of novel structures was identified due to the integration of insertion sequences at different sites (IS3/IS4/IS5/IS21 families). The insertion of an IS10 in the attI2 site of a class 2 integron, between Pc2B and Pc2C promoters, was likely mediated by a site-specific transposition event. Chromosomal insertion of the integrons at attTn7 was confirmed in 80% of the isolates. Conjugation experiments demonstrated that 29% of class 2 integrons could be mobilized to E. coli CHS26, demonstrating that they can be located in conjugative/mobilizable elements at a low frequency. Reported structures evidence how class 2 integrons have evolved by the activity of integron integrases and the invasion of ISs. Since most of them are chromosomally located, the dispersion is predominantly vertical, although conjugation events also contribute to the spread of class 2 integrons among bacterial communities.

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Información de financiación

This study was partially supported by grants UBACYT Programación 2014–2017 and ANPCyT PICT2015-3610 to MPQ (Argentina); the project SAF2016-76571-R of the Agencia Estatal de Investigación (AEI) of Spain; and the Fondo Europeo de Desarrollo Regional (FEDER).

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