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Phage regulatory circuits and virulence gene expression.

Matthew K Waldor1, David I Friedman

  • 1Department of Microbiology, Tufts University School of Medicine and Howard Hughes Medical Institute, Boston, MA 02111, USA.

Current Opinion in Microbiology
|June 28, 2005
PubMed
Summary

Bacteriophages can carry virulence genes. Phage regulatory circuits, like those in lambda and CTXphi phages, influence the expression of Shiga and cholera toxins, respectively, upon host cell activation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Bacterial virulence factors are often encoded by prophage genomes.
  • Bacteriophages act as vectors for virulence gene dissemination.
  • The role of phage regulatory circuits in virulence gene expression requires further investigation.

Purpose of the Study:

  • To investigate the contribution of phage regulatory circuits to virulence gene expression in pathogenic bacteria.
  • To compare the regulatory mechanisms of lambda and CTXphi prophages in controlling toxin production.

Main Methods:

  • Comparative analysis of prophage regulatory systems in Escherichia coli and Vibrio cholerae.
  • Examination of phage repressor systems and their interaction with host cell responses.
  • Investigation of the SOS response activation and its effect on prophage repression.

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Main Results:

  • Lambda and CTXphi phages maintain a quiescent state via repressor systems, which is abolished by host cell SOS response.
  • In lambda-type prophages, phage repressor binding solely controls Shiga toxin production and release.
  • CTXphi prophage repression involves both phage repressor and bacterial LexA, with limited control over cholera toxin production and no influence on release.

Conclusions:

  • Phage regulatory circuits play a significant role in the expression of bacterial virulence factors.
  • Distinct mechanisms govern toxin gene expression in different prophage systems.
  • Understanding these phage-bacteria interactions is crucial for combating bacterial pathogenesis.