Literature DB >> 32688008

In vitro and in vivo persistence of IncN plasmids carrying qnr genes in uropathogenic Escherichia coli isolates.

Wilson Dias Segura1, Haissa Pereira Ramos1, Renata Ester de Faria Blanc Amorim1, Ághata Cardoso da Silva Ribeiro2, Edimar Cristiano Pereira1, Rodrigo Cayô3, Ana Cristina Gales4, Antônio J Piantino Ferreira5, Luciene Andrade da Rocha Minarini6.   

Abstract

OBJECTIVES: This study aimed to evaluate the persistence of the plasmid-mediated quinolone resistance (PMQR) among uropathogenic Escherichia coli strains grown under or without exposure to subinhibitory concentrations of ciprofloxacin. Based on that, we evaluated the possible spontaneous loss or maintenance of PMQR and the possible appearance of compensatory mutations in gyrA and parC genes.
METHODS: Three uropathogenic E. coli strains harbouring chromosomal mutations in the gyrA and/or parC genes coupled with qnrS1 or qnrB2 determinants carried by distinct plasmid sizes and incompatibility N groups (IncN/ST1, IncN/ST5) were evaluated using in vitro and in vivo assays.
RESULTS: PMQRs remained stable in all strains throughout the generations evaluated, independently of exposure to ciprofloxacin in both in vivo and in vitro assays. Analysis of gyrA and parC genes after in vivo and in vitro assays revealed that no changes occurred in quinolone-resistance determining regions (QRDR).
CONCLUSION: We demonstrated that IncN plasmids were persistent over 14 days in E. coli clinical strains independently of exposure to ciprofloxacin, as well as previous mutations in QRDR.
Copyright © 2020 International Society for Antimicrobial Chemotherapy. Published by Elsevier Ltd. All rights reserved.

Entities:  

Keywords:  Escherichia coli; Fluoroquinolones; IncN plasmid; Plasmid-mediated quinolone resistance

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Year:  2020        PMID: 32688008     DOI: 10.1016/j.jgar.2020.07.006

Source DB:  PubMed          Journal:  J Glob Antimicrob Resist        ISSN: 2213-7165            Impact factor:   4.035


  2 in total

1.  Genomic analysis of qnr-harbouring IncX plasmids and their transferability within different hosts under induced stress.

Authors:  Tomas Nohejl; Adam Valcek; Ivo Papousek; Jana Palkovicova; Alexander M Wailan; Hana Pratova; Marco Minoia; Monika Dolejska
Journal:  BMC Microbiol       Date:  2022-05-19       Impact factor: 4.465

2.  Phenotypic and Genotypic Properties of Fluoroquinolone-Resistant, qnr-Carrying Escherichia coli Isolated from the German Food Chain in 2017.

Authors:  Katharina Juraschek; Carlus Deneke; Silvia Schmoger; Mirjam Grobbel; Burkhard Malorny; Annemarie Käsbohrer; Stefan Schwarz; Diana Meemken; Jens Andre Hammerl
Journal:  Microorganisms       Date:  2021-06-16
  2 in total

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