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Comparative genomic analysis between Corynebacterium pseudotuberculosis strains isolated from buffalo.

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Genomic analysis of Corynebacterium pseudotuberculosis causing Oedematous Skin Disease in buffalo reveals unique adaptations, including a diphtheria toxin gene insertion and nitrate reductase operon, suggesting host-specific evolution.

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Area of Science:

  • Veterinary Microbiology
  • Genomics
  • Pathogen Adaptation

Background:

  • Corynebacterium pseudotuberculosis is a pathogen causing Oedematous Skin Disease (OSD) in buffalo.
  • Understanding OSD pathogenesis requires detailed genomic insights into C. pseudotuberculosis strains.

Purpose of the Study:

  • To conduct a comparative genomic analysis of C. pseudotuberculosis strains from an Egyptian buffalo outbreak.
  • To identify genomic features contributing to OSD pathogenesis and buffalo host adaptation.

Main Methods:

  • Comparative genomic analysis of 11 C. pseudotuberculosis strains.
  • Phylogenomic analysis to determine evolutionary relationships.
  • Synteny and gene functional analysis.

Main Results:

  • All strains possessed 16 known pathogenicity islands (PiCp).
  • PiCp12 contained a novel insertion with a corynephage and diphtheria toxin gene, potentially aiding buffalo adaptation.
  • Presence of a nitrate reductase operon suggests intracellular survival adaptation.
  • Fusions in minor pilin genes (spaCX, spaYEF) indicate host-specific adaptation or recent mutations.
  • Phylogenomic analysis confirmed Ovis/Equi biovar separation and host-species clustering within Equi strains.

Conclusions:

  • The study elucidates specific genomic adaptations of C. pseudotuberculosis to the buffalo host.
  • The findings provide insights into the evolution and pathogenicity of this bacterium in a specific epidemic context.
  • Genomic variations highlight potential mechanisms for host adaptation and intracellular survival.