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Bacterial virulence gene regulation: an evolutionary perspective.

P A Cotter1, V J DiRita

  • 1Department of Microbiology, Immunology and Molecular Genetics, UCLA School of Medicine, Los Angeles, California 90095-1747, USA. pcotter@ucla.edu

Annual Review of Microbiology
|October 6, 2000
PubMed
Summary

Bacterial coevolution with hosts shapes virulence. Different bacteria like Salmonella, Vibrio cholerae, and Bordetellae display unique virulence gene sets and regulatory networks, influencing disease characteristics.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Bacterial coevolution with hosts is crucial for determining interaction characteristics, virulence genes, and regulatory systems.
  • Long-standing host-bacterial associations, such as Salmonellae with animals, lead to diverse virulence gene acquisition and complex regulatory networks.
  • The specific virulence factors and regulatory mechanisms dictate subspecies-specific infection patterns.

Purpose of the Study:

  • To compare the evolution of virulence and regulatory networks across different bacterial species with varying host associations.
  • To elucidate how coevolutionary histories shape bacterial pathogenicity and gene expression.
  • To understand the genetic basis of subspecies-specific differences in bacterial virulence.

Main Methods:

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  • Comparative analysis of bacterial genomes and virulence gene repertoires.
  • Examination of regulatory network structures controlling virulence gene expression.
  • Inference of evolutionary trajectories based on genetic and pathogenic data.

Main Results:

  • Salmonella subspecies exhibit extensive virulence gene acquisition and complex regulatory systems due to long-term host association.
  • Vibrio cholerae, despite a seemingly more recent association with humans, also possesses complex virulence regulatory networks.
  • Bordetellae show no evidence of horizontal gene transfer for virulence genes, with simpler regulatory structures and subspecies-specific differences arising from differential gene expression.

Conclusions:

  • Bacterial virulence evolution is strongly influenced by host association and coevolutionary history.
  • Complex regulatory networks can evolve even with seemingly simpler pathogenic strategies or limited horizontal gene transfer.
  • Differential gene expression plays a key role in generating subspecies-specific pathogenic strategies in bacteria like Bordetellae.