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Genetic characterization of mcr-1-bearing plasmids to depict molecular mechanisms underlying dissemination of the colistin resistance determinant.

Identifieur interne : 000D49 ( Main/Exploration ); précédent : 000D48; suivant : 000D50

Genetic characterization of mcr-1-bearing plasmids to depict molecular mechanisms underlying dissemination of the colistin resistance determinant.

Auteurs : Ruichao Li [République populaire de Chine] ; Miaomiao Xie [République populaire de Chine] ; Jinfei Zhang [République populaire de Chine] ; Zhiqiang Yang [République populaire de Chine] ; Lizhang Liu [République populaire de Chine] ; Xiaobo Liu [République populaire de Chine] ; Zhiwei Zheng [République populaire de Chine] ; Edward Wai-Chi Chan ; Sheng Chen [Hong Kong]

Source :

RBID : pubmed:28073961

Descripteurs français

English descriptors

Abstract

OBJECTIVES

To analyse and compare mcr-1-bearing plasmids from animal Escherichia coli isolates, and to investigate potential mechanisms underlying dissemination of mcr-1.

METHODS

Ninety-seven ESBL-producing E. coli strains isolated from pig farms in China were screened for the mcr-1 gene. Fifteen mcr-1-positive strains were subjected to molecular characterization and bioinformatic analysis of the mcr-1-bearing plasmids that they harboured.

RESULTS

Three major types of mcr-1-bearing plasmids were recovered: IncX4 (∼33 kb), IncI2 (∼60 kb) and IncHI2 (∼216-280 kb), among which the IncX4 and IncI2 plasmids were found to harbour the mcr-1 gene only, whereas multiple resistance elements including bla

CONCLUSIONS

The mcr-1 gene can be disseminated via multiple mobile elements including Tn6330, its circular intermediate and plasmids harbouring such elements. It is often co-transmitted with other resistance determinants through IncHI2 plasmids. The functional mechanism of Tn6330, a typical composite transposon harbouring mcr-1, should be further investigated.


DOI: 10.1093/jac/dkw411
PubMed: 28073961


Affiliations:


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<term>Animals (MeSH)</term>
<term>Anti-Bacterial Agents (pharmacology)</term>
<term>China (MeSH)</term>
<term>Colistin (pharmacology)</term>
<term>Computational Biology (MeSH)</term>
<term>Drug Resistance, Bacterial (MeSH)</term>
<term>Escherichia coli (drug effects)</term>
<term>Escherichia coli (genetics)</term>
<term>Escherichia coli Proteins (genetics)</term>
<term>Farms (MeSH)</term>
<term>Gene Transfer, Horizontal (MeSH)</term>
<term>Genes, Bacterial (MeSH)</term>
<term>Interspersed Repetitive Sequences (MeSH)</term>
<term>Microbial Sensitivity Tests (MeSH)</term>
<term>Plasmids (classification)</term>
<term>Sequence Analysis, DNA (MeSH)</term>
<term>Swine (microbiology)</term>
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<keywords scheme="KwdFr" xml:lang="fr">
<term>Analyse de séquence d'ADN (MeSH)</term>
<term>Animaux (MeSH)</term>
<term>Antibactériens (pharmacologie)</term>
<term>Biologie informatique (MeSH)</term>
<term>Chine (MeSH)</term>
<term>Colistine (pharmacologie)</term>
<term>Escherichia coli (effets des médicaments et des substances chimiques)</term>
<term>Escherichia coli (génétique)</term>
<term>Fermes (MeSH)</term>
<term>Gènes bactériens (MeSH)</term>
<term>Plasmides (classification)</term>
<term>Protéines Escherichia coli (génétique)</term>
<term>Résistance bactérienne aux médicaments (MeSH)</term>
<term>Suidae (microbiologie)</term>
<term>Séquences répétées dispersées (MeSH)</term>
<term>Tests de sensibilité microbienne (MeSH)</term>
<term>Transfert horizontal de gène (MeSH)</term>
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<term>Escherichia coli Proteins</term>
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<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en">
<term>Anti-Bacterial Agents</term>
<term>Colistin</term>
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<term>Plasmids</term>
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<keywords scheme="MESH" qualifier="drug effects" xml:lang="en">
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<term>Escherichia coli</term>
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<term>Escherichia coli</term>
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<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>Escherichia coli</term>
<term>Plasmides</term>
<term>Protéines Escherichia coli</term>
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<term>Suidae</term>
</keywords>
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<term>Swine</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr">
<term>Antibactériens</term>
<term>Colistine</term>
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<term>Animals</term>
<term>China</term>
<term>Computational Biology</term>
<term>Drug Resistance, Bacterial</term>
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<term>Gene Transfer, Horizontal</term>
<term>Genes, Bacterial</term>
<term>Interspersed Repetitive Sequences</term>
<term>Microbial Sensitivity Tests</term>
<term>Sequence Analysis, DNA</term>
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<term>Biologie informatique</term>
<term>Chine</term>
<term>Fermes</term>
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<term>Résistance bactérienne aux médicaments</term>
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<term>Tests de sensibilité microbienne</term>
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<p>
<b>OBJECTIVES</b>
</p>
<p>To analyse and compare mcr-1-bearing plasmids from animal Escherichia coli isolates, and to investigate potential mechanisms underlying dissemination of mcr-1.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>METHODS</b>
</p>
<p>Ninety-seven ESBL-producing E. coli strains isolated from pig farms in China were screened for the mcr-1 gene. Fifteen mcr-1-positive strains were subjected to molecular characterization and bioinformatic analysis of the mcr-1-bearing plasmids that they harboured.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>RESULTS</b>
</p>
<p>Three major types of mcr-1-bearing plasmids were recovered: IncX4 (∼33 kb), IncI2 (∼60 kb) and IncHI2 (∼216-280 kb), among which the IncX4 and IncI2 plasmids were found to harbour the mcr-1 gene only, whereas multiple resistance elements including bla</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>CONCLUSIONS</b>
</p>
<p>The mcr-1 gene can be disseminated via multiple mobile elements including Tn6330, its circular intermediate and plasmids harbouring such elements. It is often co-transmitted with other resistance determinants through IncHI2 plasmids. The functional mechanism of Tn6330, a typical composite transposon harbouring mcr-1, should be further investigated.</p>
</div>
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<AbstractText Label="OBJECTIVES">To analyse and compare mcr-1-bearing plasmids from animal Escherichia coli isolates, and to investigate potential mechanisms underlying dissemination of mcr-1.</AbstractText>
<AbstractText Label="METHODS">Ninety-seven ESBL-producing E. coli strains isolated from pig farms in China were screened for the mcr-1 gene. Fifteen mcr-1-positive strains were subjected to molecular characterization and bioinformatic analysis of the mcr-1-bearing plasmids that they harboured.</AbstractText>
<AbstractText Label="RESULTS">Three major types of mcr-1-bearing plasmids were recovered: IncX4 (∼33 kb), IncI2 (∼60 kb) and IncHI2 (∼216-280 kb), among which the IncX4 and IncI2 plasmids were found to harbour the mcr-1 gene only, whereas multiple resistance elements including bla
<sub>CTX-M</sub>
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<sub>CMY</sub>
, bla
<sub>TEM</sub>
, fosA, qnrS, floR and oqxAB were detected, in various combinations, alongside mcr-1 in the IncHI2 plasmids. The profiles of mcr-1-bearing plasmids in the test strains were highly variable, with coexistence of two mcr-1-bearing plasmids being common. However, the MIC of colistin was not affected by the number of mcr-1-carrying plasmids harboured. Comparative analysis of the plasmids showed that they contained an mcr-1 gene cassette with varied structures (mcr-1-orf, ISApl1-mcr-1-orf and Tn6330), with the IncHI2 type being the most active in acquiring foreign resistance genes. A novel transposon, Tn6330, with the structure ISApl1-mcr-1-orf-ISApl1 was found to be the key element mediating translocation of mcr-1 into various plasmid backbones through formation of a circular intermediate.</AbstractText>
<AbstractText Label="CONCLUSIONS">The mcr-1 gene can be disseminated via multiple mobile elements including Tn6330, its circular intermediate and plasmids harbouring such elements. It is often co-transmitted with other resistance determinants through IncHI2 plasmids. The functional mechanism of Tn6330, a typical composite transposon harbouring mcr-1, should be further investigated.</AbstractText>
<CopyrightInformation>© The Author 2016. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.</CopyrightInformation>
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<AffiliationInfo>
<Affiliation>The State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR.</Affiliation>
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<Affiliation>The State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR.</Affiliation>
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<PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType>
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<Year>2016</Year>
<Month>09</Month>
<Day>28</Day>
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<Country>England</Country>
<MedlineTA>J Antimicrob Chemother</MedlineTA>
<NlmUniqueID>7513617</NlmUniqueID>
<ISSNLinking>0305-7453</ISSNLinking>
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