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Related Experiment Videos

Rhodococcus equi plasmids: isolation and partial characterization.

O Tkachuk-Saad1, J Prescott

  • 1Department of Veterinary Microbiology and Immunology, University of Guelph, Ontario, Canada.

Journal of Clinical Microbiology
|December 1, 1991
PubMed
Summary
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Plasmids in Rhodococcus equi strains were analyzed, revealing an 80-kb plasmid common in horse isolates and a 105-kb plasmid in pig isolates. The 80-kb plasmid showed a strong association with virulence-associated protein production.

Area of Science:

  • Veterinary Microbiology
  • Bacterial Genetics

Background:

  • Rhodococcus equi is an important pathogen in foals and pigs.
  • Understanding the genetic basis of R. equi virulence is crucial for disease control.

Purpose of the Study:

  • To investigate the plasmid content of Rhodococcus equi strains from clinical sources.
  • To determine the association of specific plasmids with host origin and virulence.

Main Methods:

  • Plasmid screening using two methods.
  • Isolation and purification of plasmid DNA.
  • Restriction enzyme analysis of plasmid DNA.

Main Results:

  • 49 out of 54 R. equi strains harbored plasmids.
  • An 80-kb plasmid was prevalent in equine isolates, while a 105-kb plasmid was more common in porcine isolates.

Related Experiment Videos

  • Restriction analysis confirmed plasmid relatedness and highlighted differences between equine and porcine strains.
  • The 80-kb plasmid was significantly associated with the production of a 17.5-kDa virulence-associated protein.

    • Conclusions:

    • Plasmid profiles of R. equi vary with host origin.
    • The 80-kb plasmid is a potential virulence factor in R. equi, warranting further investigation.
    • The 105-kb plasmid may also play a role in R. equi pathogenesis.