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Volume 168, Issue 2

Presence of mediated linezolid resistance in multiple lineages and plasmids of revealed by long read sequencing Open Access

Abstract

Transferable linezolid resistance due to , , and -like genes is increasingly detected in enterococci associated with animals and humans globally. We aimed to characterize the genetic environment of in linezolid-resistant isolates from Scotland. Six linezolid-resistant isolated from urogenital samples were confirmed to carry the gene by PCR. Short read (Illumina) sequencing showed the isolates were genetically distinct (>13900 core SNPs) and belonged to different MLST sequence types. Plasmid contents were examined using hybrid assembly of short and long read (Oxford Nanopore MinION) sequencing technologies. The gene was located on distinct plasmids in each isolate, suggesting that transfer of a single plasmid did not contribute to dissemination in this collection. pTM6294-2, BX5936-1 and pWE0438-1 were similar to -positive plasmids from China and Japan, while the remaining three plasmids had limited similarity to other published examples. We identified the novel Tn transposon in pWE0254-1 carrying linezolid (), macrolide () and spectinomycin [ANT(9)-Ia] resistance genes. OptrA amino acid sequences differed by 0–20 residues. We report multiple variants of on distinct plasmids in diverse strains of . It is important to identify the selection pressures driving the emergence and maintenance of resistance against linezolid to retain the clinical utility of this antibiotic.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): antimicrobial resistance , Enterococcus faecalis , linezolid , optrA , plasmid and Tn6993
Funding
This study was supported by the:
  • Wellcome Trust (Award 105621/Z/14/Z)
    • Principle Award Recipient: NotApplicable
  • Chief Scientist Office, Scottish Government Health and Social Care Directorate (Award SIRN/10)
    • Principle Award Recipient: MatthewTG Holden
© 2022 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2022-02-07
2024-05-06
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Presence of optrA-mediated linezolid resistance in multiple lineages and plasmids of Enterococcus faecalis revealed by long read sequencing
Microbiology 168, 001137 (2022); https://doi.org/10.1099/mic.0.001137
/content/journal/micro/10.1099/mic.0.001137
/content/journal/micro/10.1099/mic.0.001137
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