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Origin of the plasmid-mediated fosfomycin resistance gene fosA3.

ABSTRACT: Background:fosA3 is the most commonly reported plasmid-mediated fosfomycin resistance gene among Enterobacteriaceae. Objectives:To identify the origin of fosA3. Methods:The chromosome of Kluyvera georgiana clinical strain YDC799 was fully sequenced with single-molecule real-time sequencing. Comparative genetic analysis was performed for K. georgiana YDC799, K. georgiana type strain ATCC 51603 and representative fosA3-carrying plasmids. fosA genes were cloned in Escherichia coli to confirm function. Results:K. georgiana YDC799 harboured fosA (designated fosAKG) and blaCTX-M-8 on the chromosome. The genetic environments surrounding fosA3 and bounded by IS26 were nearly identical with the corresponding regions of K. georgiana YDC799 and ATCC 51603. The amino acid sequence of FosAKG from YDC799 and K. georgiana ATCC 51603 shared 99% and 94% identity with FosA3, respectively. Cloned FosAKG conferred fosfomycin resistance with an MIC of?>1024 mg/L for E. coli. Conclusions:The plasmid-mediated fosA3 gene was likely mobilized from the chromosome of K. georgiana by an IS26-mediated event.

SUBMITTER: Ito R 

PROVIDER: S-EPMC5890757 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Origin of the plasmid-mediated fosfomycin resistance gene fosA3.

Ito Ryota R   Pacey Marissa P MP   Mettus Roberta T RT   Sluis-Cremer Nicolas N   Doi Yohei Y  

The Journal of antimicrobial chemotherapy 20180201 2

<h4>Background</h4>fosA3 is the most commonly reported plasmid-mediated fosfomycin resistance gene among Enterobacteriaceae.<h4>Objectives</h4>To identify the origin of fosA3.<h4>Methods</h4>The chromosome of Kluyvera georgiana clinical strain YDC799 was fully sequenced with single-molecule real-time sequencing. Comparative genetic analysis was performed for K. georgiana YDC799, K. georgiana type strain ATCC 51603 and representative fosA3-carrying plasmids. fosA genes were cloned in Escherichia  ...[more]

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