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Antimicrobial Resistance & Infection Control
Published in:

Open Access 01-12-2017 | Research

Genetic characterization of novel class 1 Integrons In0, In1069 and In1287 to In1290, and the inference of In1069-associated integron evolution in Enterobacteriaceae

Authors: Dongguo Wang, Jianfeng Zhu, Kaiyu Zhou, Jiayu Chen, Zhe Yin, Jiao Feng, Liman Ma, Dongsheng Zhou

Published in: Antimicrobial Resistance & Infection Control | Issue 1/2017

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Abstract

Background

This study aims to characterize genetically related class 1 integrons In1069, In893 and In1287 to In1290, and to further propose a scheme of stepwise integration or excision of individual gene cassettes (GCs) to generation of these integron variations.

Methods

Six of 139 non-redundant Enterobacteriaceae strains were studied by bacterial antimicrobial susceptibility testing, detection of carbapenemase activity, and integron sequencing and sequence comparison.

Results

Six novel class 1 integrons, In0, In1069, and In1287 to In1290, together with the previously characterized In893, were determined from the above strains. An unusual bla KPC-2-carrying In0 and the bla IMP-30-carrying In1069 coexists in a single isolate of Escherichia coli. In0 contains a PcH1 promoter and a truncated aacA4’-3 gene cassette (GCaacA4’-3), as well as a bla KPC-2-containing region of Tn6296 integrated between PcH1 and GCaacA4’-3. In1069 carries GCbla IMP-30 and GCaacA4’-3 in this order. The other five integrons, In893 and In1287 to In1290, are genetically related to In1069, and all possess a core GCaacA4’-3. The integration or excision of one or more individual gene cassettes, such as GCbla IMP-30, GCaadA16, GCcatB3, GCarr3 and GCdfrA27, upstream or downstream of GCaacA4’-3 generates various gene cassettes arrays among these five integrons.

Conclusions

These findings provide the insight into stepwise and parallel evolution of In1069-associated integron variations likely under antibiotic selection pressure in clinical settings.
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Metadata
Title
Genetic characterization of novel class 1 Integrons In0, In1069 and In1287 to In1290, and the inference of In1069-associated integron evolution in Enterobacteriaceae
Authors
Dongguo Wang
Jianfeng Zhu
Kaiyu Zhou
Jiayu Chen
Zhe Yin
Jiao Feng
Liman Ma
Dongsheng Zhou
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Antimicrobial Resistance & Infection Control / Issue 1/2017
Electronic ISSN: 2047-2994
DOI
https://doi.org/10.1186/s13756-017-0241-9

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