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Polymorphism of genes encoding PmrAB in colistin-resistant strains of Escherichia coli and Salmonella enterica isolated from poultry and swine

The Journal of Antimicrobial Chemotherapy publica este artículo de investigación

1 de enero de 2015

Objectives: To detect the occurrence of low susceptibility to colistin (polymyxin E), a last-resort antimicrobial, among enterobacteria isolated from samples of animal origin (poultry and swine) and to find out the molecular basis of colistin resistance. Methods: Salmonella enterica and Escherichia coli were isolated from eggs and swine samples. Bacterial strains were screened for colistin resistance by using MIC determinations interpreted according to EUCAST recommendations. pmrAB genes were amplified by PCR from bacterial isolates and their sequences were characterized.
Results: Nine colistin-resistant strains were detected in a collection of 739 enterobacteria (S. enterica and E. coli) isolated from animal samples taken in different environments. Sequences encoding the PmrAB two-component sensor–regulator from two colistin-resistant E. coli strains isolated from swine faeces presented three non-synonymous polymorphisms, producing the variants 39S→I and 81R→S of PmrA and 161V→G of PmrB, among which the involvement of mutations in PmrA-81 and PmrB-161 in resistance to the antimicrobial had been previously shown. No variation at the protein level was detected after analysis of PmrAB sequences from seven colistin-resistant S. enterica strains.
Conclusions: E. coli strains carrying mutations in PmrAB that confer resistance to polymyxins, which might have evolved in vivo and have been rarely detected, are described for the first time in enterobacteria isolated from animals




Quesada A., Porrero MC., Tellez S., Palomo G., Garcia M. y Dominguez L..




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Polymorphism of genes encoding PmrAB in colistin-resistant strains of Escherichia coli and Salmonella enterica isolated from poultry and swine

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Polymorphism of genes encoding PmrAB in colistin-resistant strains of Escherichia coli and Salmonella enterica isolated from poultry and swine

Participantes:

Universidad ComplutenseServicio de Zoonosis de Transmisión Alimentaria y Resistencia a Antimicrobianos (ZTA). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

Universidad de ExtremaduraDepartamento de Bioquímica, Biología Molecular y Genética. Facultad de Veterinaria. Universidad de Extremadura (UNEX).







The Journal of Antimicrobial Chemotherapy
FACTOR YEAR Q
4.919 2015

NLMID: 7513617

PMID: 25150146

ISSN: 0305-7453



TÍTULO: Polymorphism of genes encoding PmrAB in colistin-resistant strains of Escherichia coli and Salmonella enterica isolated from poultry and swine


REVISTA: J. Antimicrob. Chemother.


NUMERACIÓN: 70(1):71-4


AÑO: 2015


EDITORIAL: Oxford University Press


AUTORES: Quesada A., Porrero MC., Tellez S., Palomo G., Garcia M. and Dominguez L..


PARTICIPANTES VISAVET


5th
María García Martín
Last
Lucas Domínguez Rodríguez

DOI: https://doi.org/10.1093/jac/dku320


CITA ESTA PUBLICACIÓN:

Quesada A., Porrero MC., Tellez S., Palomo G., Garcia M. y Dominguez L. Polymorphism of genes encoding PmrAB in colistin-resistant strains of Escherichia coli and Salmonella enterica isolated from poultry and swine. The Journal of Antimicrobial Chemotherapy. 70(1):71-4. 2015. (A). ISSN: 0305-7453. DOI: 10.1093/jac/dku320


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