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Related Experiment Videos

How to become a pathogen

E A Groisman1, H Ochman

  • 1Washington University School of Medicine, Dept of Molecular Microbiology, St Louis, MO 63110.

Trends in Microbiology
|August 1, 1994
PubMed
Summary
This summary is machine-generated.

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Salmonella pathogenicity is complex; most virulence genes are shared with nonpathogenic relatives, and unique Salmonella genes aren't crucial for causing disease. Alternative evolutionary paths likely explain Salmonella's virulence.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Bacterial virulence is often considered an acquired trait, with pathogens gaining specific genetic elements to cause disease.
  • The genetic basis of Salmonella pathogenicity is not fully understood, particularly concerning the origin of its virulence.

Purpose of the Study:

  • To investigate the evolutionary origins of Salmonella pathogenicity.
  • To determine the role of shared and unique genes in Salmonella virulence.

Main Methods:

  • Comparative genomic analysis of Salmonella and related bacterial species.
  • Assessment of the essentiality of Salmonella-specific genes for virulence.

Main Results:

  • The majority of Salmonella virulence genes are also found in closely related nonpathogenic bacterial species.

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  • Most genes unique to Salmonella are not essential for its ability to cause disease.

    • Conclusions:

    • The traditional view of virulence as a solely acquired state may not fully explain Salmonella pathogenicity.
    • Alternative evolutionary mechanisms, beyond the simple acquisition of specific gene loci, are likely responsible for the development of Salmonella virulence.