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Phase-variable restriction/modification systems are required for Helicobacter pylori colonization.

Jonathan C Gauntlett1, Hans-Olof Nilsson1, Alma Fulurija1

  • 1Ondek Pty Ltd and Helicobacter pylori Research Laboratory, School of Pathology and Laboratory Medicine, Marshall Centre for Infectious Disease Research and Training, University of Western Australia, Nedlands 6009, Western Australia, Australia.

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Phase-variable methyltransferases are crucial for Helicobacter pylori colonization and host adaptation. Disrupting these phasevarion systems impacts bacterial survival, highlighting the importance of epigenetic diversity in pathogenesis.

Keywords:
Helicobacter pyloriModificationPhase variationPhasevarionRestriction

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Area of Science:

  • Microbiology
  • Genetics
  • Bacterial Pathogenesis

Background:

  • Bacterial pathogens use phasevarions for host adaptation and immune evasion through differential gene expression.
  • Phase-variable restriction-modification (RM) systems generate phenotypic diversity.
  • Helicobacter pylori utilizes phasevarions, but the role of RM systems in colonization is unstudied.

Purpose of the Study:

  • Investigate the significance of phase-variable RM systems in H. pylori host colonization.
  • Determine the impact of specific mutations in phase-variable RM systems on colonization ability.

Main Methods:

  • Constructed two mutant types of H. pylori OND79 lacking phase variation: a deletion mutant (DEL) and a full-expression mutant (ON).
  • Assessed the colonization ability of these mutants in a mouse model.
  • Identified five phase-variable genes involved in methyltransferases or RM systems.

Main Results:

  • Mutants showed varied colonization effects: some had little impact, others were detrimental when the full-length protein was expressed.
  • A third category of mutants, where both mutations were detrimental, indicated a critical role for differential methylation.
  • Phase-variable methyltransferases were found to be critical for H. pylori colonization.

Conclusions:

  • Phase-variable methyltransferases are essential for H. pylori colonization and pathogenesis.
  • Epigenetic diversity generated by phasevarions is vital for host adaptation.
  • Further research on non-essential RM mutants can elucidate the role of phasevarion in H. pylori persistence.