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Authors: Beyrouthy, Racha and Robin, Frederic and Hamze, Monzer and Bonnet, Richard

To investigate the resistance mechanisms and genetic support underlying the high resistance level of the Klebsiella pneumoniae strain CMUL78 to aminoglycoside and ß-lactam antibiotics.Antibiotic susceptibility was assessed by the disc diffusion method and MICs were determined by the microdilution method. Antibiotic resistance genes and their genetic environment were characterized by PCR and Sanger sequencing. Plasmid contents were analysed in the clinical strain and transconjugants obtained by mating-out assays. Complete plasmid sequencing was performed with PacBio and Illumina technology.Strain CMUL78 co-produced the 16S rRNA methyltransferase (RMTase) RmtH, carbapenemase OXA-48 and ESBL SHV-12. The rmtH- and blaSHV-12-encoding genes were harboured by a novel ~115 kb IncFIIk plasmid designated pRmtH, and blaOXA-48 by a ~62 kb IncL/M plasmid related to pOXA-48a. pRmtH plasmid possessed seven different stability modules, one of which is a novel hybrid toxin-antitoxin system. Interestingly, pRmtH plasmid harboured a 4-fold amplification of an rmtH-ISCR2 unit arranged in tandem and inserted within a novel IS26-based composite transposon designated Tn6329.This is the first known report of the 16S RMTase-encoding gene rmtH in a plasmid. The rmtH-ISCR2 unit was inserted in a composite transposon as a 4-fold tandem repeat, a scarcely reported organization.© 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.

Journal: The Journal of antimicrobial chemotherapy
DOI: 10.1093/jac/dkw435
Year: 2017

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