July 19, 2019  |  

Genomic epidemiology of global Klebsiella pneumoniae carbapenemase (KPC)-producing Escherichia coli.

Authors: Stoesser, N and Sheppard, A E and Peirano, G and Anson, L W and Pankhurst, L and Sebra, R and Phan, H T T and Kasarskis, A and Mathers, A J and Peto, T E A and Bradford, P and Motyl, M R and Walker, A S and Crook, D W and Pitout, J D

The dissemination of carbapenem resistance in Escherichia coli has major implications for the management of common infections. bla KPC, encoding a transmissible carbapenemase (KPC), has historically largely been associated with Klebsiella pneumoniae, a predominant plasmid (pKpQIL), and a specific transposable element (Tn4401, ~10?kb). Here we characterize the genetic features of bla KPC emergence in global E. coli, 2008-2013, using both long- and short-read whole-genome sequencing. Amongst 43/45 successfully sequenced bla KPC-E. coli strains, we identified substantial strain diversity (n?=?21 sequence types, 18% of annotated genes in the core genome); substantial plasmid diversity (=9 replicon types); and substantial bla KPC-associated, mobile genetic element (MGE) diversity (50% not within complete Tn4401 elements). We also found evidence of inter-species, regional and international plasmid spread. In several cases bla KPC was found on high copy number, small Col-like plasmids, previously associated with horizontal transmission of resistance genes in the absence of antimicrobial selection pressures. E. coli is a common human pathogen, but also a commensal in multiple environmental and animal reservoirs, and easily transmissible. The association of bla KPC with a range of MGEs previously linked to the successful spread of widely endemic resistance mechanisms (e.g. bla TEM, bla CTX-M) suggests that it may become similarly prevalent.

Journal: Scientific reports
DOI: 10.1038/s41598-017-06256-2
Year: 2017

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