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Volume 8, Issue 2

Comparative genomic analysis of isolates associated with either bovine intramammary infections or human infections demonstrates the importance of restriction-modification systems in host adaptation Open Access

Abstract

is a major etiological agent of clinical and subclinical bovine mastitis. The versatile and adaptative evolutionary strategies of this bacterium have challenged mastitis control and prevention globally, and the high incidence of mastitis increases concerns about antimicrobial resistance (AMR) and zoonosis. This study aims to describe the evolutionary relationship between bovine intramammary infection (IMI)-associated and human pathogenic and further elucidate the specific genetic composition that leads to the emergence of successful bovine IMI-associated lineages. We performed a phylogenomic analysis of 187 . isolates that originated from either dairy cattle or humans. Our results revealed that bovine IMI-associated isolates showed distinct clades compared to human-originated isolates. From a pan-genome analysis, 2070 core genes were identified. Host-specific genes and clonal complex (CC)-specific genes were also identified in bovine isolates, mostly located in mobile genetic elements (MGEs). Additionally, the genome sequences of three apparent human-adapted isolates (two from CC97 and one from CC8), isolated from bovine mastitis samples, may provide an snapshot of the genomic characteristics in early host spillover events. Virulence and AMR genes were not conserved among bovine IMI-associated isolates. Restriction-modification (R-M) genes in bovine IMI-associated demonstrated that the Type I R-M system was lineage-specific and Type II R-M system was sequence type (ST)-specific. The distribution of exclusive, virulence, and AMR genes were closely correlated with the presence of R-M systems in , suggesting that R-M systems may contribute to shaping clonal diversification by providing a genetic barrier to the horizontal gene transfer (HGT). Our findings indicate that the CC or ST lineage-specific R-M systems may limit genetic exchange between bovine-adapted isolates from different lineages.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): bovine mastitis , comparative genomics , restriction-modification system and Staphylococcus aureus
Funding
This study was supported by the:
  • NSERC (Award 2015-05916)
    • Principle Award Recipient: FrançoisMalouin
  • NSERC CREATE in Milk Quality
    • Principle Award Recipient: ÉlodieDemontier
  • NSERC CREATE in Milk Quality
    • Principle Award Recipient: AlexisDube-Duquette
  • NSERC CREATE in Milk Quality
    • Principle Award Recipient: DongyunJung
  • NSERC CREATE in Milk Quality
    • Principle Award Recipient: SoyounPark
  • Op+lait Subvention Nouvelles Initiatives 2018/2019
    • Principle Award Recipient: JenniferRonholm
© 2022 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2022-02-18
2024-04-25
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Comparative genomic analysis of Staphylococcus aureus isolates associated with either bovine intramammary infections or human infections demonstrates the importance of restriction-modification systems in host adaptation
M Gen 8, 000779 (2022); https://doi.org/10.1099/mgen.0.000779
/content/journal/mgen/10.1099/mgen.0.000779
/content/journal/mgen/10.1099/mgen.0.000779
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