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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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A regulatory cascade controls Staphylococcus aureus pathogenicity island activation.

Andreas F Haag1, Magdalena Podkowik1,2,3, Rodrigo Ibarra-Chávez1

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Staphylococcal pathogenicity islands (SaPIs) are mobile genetic elements. We discovered that SaPI3, previously thought defective, is activated by other SaPIs, revealing a novel regulatory cascade for toxin gene spread.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Staphylococcal pathogenicity islands (SaPIs) are mobile genetic elements encoding toxins like SEB.
  • SaPIs are regulated by repressors and helper phage proteins.
  • Multiple SaPIs can co-reside in staphylococcal strains, potentially influencing each other.

Purpose of the Study:

  • To investigate regulatory interactions between co-resident SaPIs.
  • To understand the mobilization defect of SaPI3.

Main Methods:

  • Classical genetics for studying regulatory interactions.
  • Bioinformatics analysis to identify related SaPIs and regulatory modules.

Main Results:

  • SaPI regulatory systems generally do not cross-react, with SaPI3 as a key exception.
  • SaPI3 is induced by other SaPIs (e.g., SaPI2, SaPIbov1, SaPIn1) via a conserved protein, Sis, which counteracts the SaPI3 repressor.
  • Over 30 SaPI3 relatives with a conserved regulatory module (immA-immR-str') were identified.

Conclusions:

  • SaPI3 is not defective but relies on co-resident SaPIs for induction and spread.
  • This inter-SaPI regulation represents a novel mechanism for spreading virulence factors.
  • SaPI3 and its relatives function as 'SaPI satellites'.