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Novel genomic islands and a new vanDsubtype in the first sporadic VanD-type vancomycin resistant enterococci in Norway

Permanent lenke
https://hdl.handle.net/10037/21992
DOI
https://doi.org/10.1371/journal.pone.0255187
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article.pdf (1.068Mb)
Publisert versjon (PDF)
Dato
2021-07-23
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
AL-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Bjørnholt, Jørgen Vildershøj; Jakovljev, Aleksandra; Hultström, Maria Elisabeth; Sundsfjord, Arnfinn; Hegstad, Kristin
Sammendrag
Background - Vancomycin-resistant enterococci (VRE) represent several types of transferable vancomycin resistance gene clusters. The vanD type, associated with moderate to high level vancomycin resistance, has only sporadically been described in clinical isolates. The aim of this study was to perform a genetic characterization of the first VanD-type VRE strains detected in Norway.

Methods - The VanD-type VRE-strains (n = 6) from two patient cases were examined by antimicrobial susceptibility testing and whole genome sequencing (WGS) to uncover Van-phenotype, strain phylogeny, the vanD gene clusters, and their genetic surroundings. The putative transferability of vanD was examined by circularization PCR and filter mating.

Results - The VanD-type Enterococcus faecium (n = 4) and Enterococcus casseliflavus (n = 2) strains recovered from two cases (A and B), expressed moderate to high level vancomycin resistance (MIC 64—>256 mg/L) and various levels of teicoplanin susceptibility (MIC 2—>256 mg/L). WGS analyses revealed phylogenetically different E. faecium strains (A1, A2, and A3 of case A and B1 from case B) as well as vanD gene clusters located on different novel genomic islands (GIs). The E. casseliflavus strains (B2 and B3 of case B) were not clonally related, but harbored nearly identical novel GIs. The vanD cluster of case B strains represents a novel vanD-subtype. All the vanD-GIs were integrated at the same chromosomal site and contained genes consistent with a Clostridiales origin. Circular forms of the vanD-GIs were detected in all strains except B1. Transfer of vanD to an E. faecium recipient was unsuccessful.

Conclusions - We describe the first VanD-type E. casseliflavus strains, a novel vanD-subtype, and three novel vanD-GIs with a genetic content consistent with a Clostridiales order origin. Despite temporal occurrence, case A and B E. faecium strains were phylogenetically diverse and harbored different vanD subtypes and vanD-GIs.

Er en del av
AL-Rubaye, M.T.S. (2023). Exploring the genomes of the Norwegian vancomycin resistant enterococci. (Doctoral thesis). https://hdl.handle.net/10037/28673.
Forlag
Public Library of Science
Sitering
Al-Rubaye MTS, Janice JJ, Bjørnholt, Jakovljev, Hultström Me, Sundsfjord, Hegstad. Novel genomic islands and a new vanDsubtype in the first sporadic VanD-type vancomycin resistant enterococci in Norway. PLOS ONE. 2021;16(7):1-15
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  • Artikler, rapporter og annet (medisinsk biologi) [1103]
Copyright 2021 The Author(s)

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