Rapidly evolving changes and gene loss associated with host switching in Corynebacterium pseudotuberculosis

Area of Science:

• Genomics
• Evolutionary Biology
• Microbial Pathogenesis

Background:

• Corynebacterium pseudotuberculosis causes significant disease in various hosts.
• Understanding the genetic basis of its adaptation is crucial for disease control.

Purpose of the Study:

• To identify genes under positive selection in C. pseudotuberculosis.
• To investigate host-specific adaptation and specialization within the species.
• To explore potential novel targets for pathogen control.

Main Methods:

• Phylogenomic analysis of 29 C. pseudotuberculosis genomes.
• Genome-scale positive selection analyses.
• Comparative analysis of genes across different clades and biovars (Ovis and Equi).

Main Results:

• Identified 27 genes undergoing adaptive evolutionary changes.
• Observed significant differences in gene content and selective pressures across clades.
• Correlated some genetic changes with isolation host and potential niche factors.

Conclusions:

• C. pseudotuberculosis exhibits ongoing adaptation and specialization, often linked to its host.
• Rapidly evolving genes show homology to virulence factors and antimicrobial resistance genes.
• This analysis can identify novel targets for developing strategies to control C. pseudotuberculosis.