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Volume 6, Issue 12

Genomic rearrangements uncovered by genome-wide co-evolution analysis of a major nosocomial pathogen, Open Access

Abstract

is a gut commensal of the gastro-digestive tract, but also known as nosocomial pathogen among hospitalized patients. Population genetics based on whole-genome sequencing has revealed that strains from hospitalized patients form a distinct clade, designated clade A1, and that plasmids are major contributors to the emergence of nosocomial . Here we further explored the adaptive evolution of using a genome-wide co-evolution study (GWES) to identify co-evolving single-nucleotide polymorphisms (SNPs). We identified three genomic regions harbouring large numbers of SNPs in tight linkage that are not proximal to each other based on the completely assembled chromosome of the clade A1 reference hospital isolate AUS0004. Close examination of these regions revealed that they are located at the borders of four different types of large-scale genomic rearrangements, insertion sites of two different genomic islands and an IS-like transposon. In non-clade A1 isolates, these regions are adjacent to each other and they lack the insertions of the genomic islands and IS-like transposon. Additionally, among the clade A1 isolates there is one group of pet isolates lacking the genomic rearrangement and insertion of the genomic islands, suggesting a distinct evolutionary trajectory. analysis of the biological functions of the genes encoded in three regions revealed a common link to a stress response. This suggests that these rearrangements may reflect adaptation to the stringent conditions in the hospital environment, such as antibiotics and detergents, to which bacteria are exposed. In conclusion, to our knowledge, this is the first study using GWES to identify genomic rearrangements, suggesting that there is considerable untapped potential to unravel hidden evolutionary signals from population genomic data.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Enterococcus faecium , genome-wide co-evolution analysis and genomic rearrangement
Funding
This study was supported by the:
  • Joint Programming Initiative on Antimicrobial Resistance (Award JPIAMR2016-AC16)
    • Principle Award Recipient: RobJ.L. Willems
© 2020 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2020-11-30
2024-04-26
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Genomic rearrangements uncovered by genome-wide co-evolution analysis of a major nosocomial pathogen, Enterococcus faecium
M Gen 6, e000488 (2020); https://doi.org/10.1099/mgen.0.000488
/content/journal/mgen/10.1099/mgen.0.000488
/content/journal/mgen/10.1099/mgen.0.000488
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