April 21, 2020  |  

IncC blaKPC-2-positive plasmid characterized from ST648 Escherichia coli.

Authors: Papagiannitsis, Costas C and Bitar, Ibrahim and Malli, Ergina and Tsilipounidaki, Katerina and Hrabak, Jaroslav and Petinaki, Efthimia

This study describes the characterization of type 2 IncC plasmids pC-Ec20-KPC and pC-Ec2-KPC, carrying blaKPC-2 gene, from two multiresistant E. coli recovered in the University Hospital of Larissa, in 2018.Escherichia coli, Ec-2Lar and Ec-20Lar, were recovered from rectal swabs from two patients, during the monthly surveillance cultures. Transfer experiments by conjugation were carried out with E. coli recipients. blaKPC-carrying plasmids were characterized by S1 profiling. Isolates were typed by MLST. Whole bacterial genome was sequenced using the Sequel platform.Both E. coli isolates, belonging to ST648, transferred the blaKPC-2 to E. coli A15 laboratory strain by conjugation. Plasmid analysis revealed that the transconjugants harbored blaKPC-positive plasmids of different sizes. Analysis of plasmid sequences showed that, in both isolates, blaKPC-2 gene was carried on type 2 IncC plasmids pC-Ec20-KPC and pC-Ec2-KPC. Both plasmids carried the ARI-B resistance island, which consisted of several resistance genes, intact and truncated copies of several mobile elements, and a 25,571-bp segment harboring coding sequences for an iron transporter. The blaKPC-2 gene was part of the transposon Tn4401a, which was bounded by direct repeats of 5 bp (TCCTT) suggesting its transposition into the IncC plasmids.To our knowledge, this is the first report on complete nucleotide sequences of type 2 IncC plasmids. These findings, which hypothesize the acquisition of KPC-2-encoding transposon Tn4401a by an IncC replicon, indicate the ongoing need for molecular surveillance studies of MDR pathogens. Additionally, they underline the increasing clinical importance of the IncC plasmid family.Copyright © 2019. Published by Elsevier Ltd.

Journal: Journal of global antimicrobial resistance
DOI: 10.1016/j.jgar.2019.05.001
Year: 2019

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