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Why do bacteria accumulate antiphage defence systems?

Tyler Clabby1, Florian Tesson1, Baptiste Gaborieau2,3

  • 1Department of Genetics and Genomics, Pasteur Institute, 75015 Paris, France.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|September 4, 2025
PubMed
Summary
This summary is machine-generated.

Bacteria accumulate diverse antiphage systems for community protection or mobile genetic element (MGE) defense. Their distribution impacts phage-bacteria interactions and phage therapy effectiveness, with ecological context being crucial.

Keywords:
bacteriophagedefence systemshost rangemobile genetic elementsphage therapy

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Bacterial genomes encode numerous antiphage systems, but their co-occurrence and distribution are not fully understood.
  • The ecological drivers and evolutionary pressures shaping these defense systems remain a key research question.

Purpose of the Study:

  • To review and discuss the reasons behind the accumulation of multiple antiphage systems in bacteria.
  • To examine how these defense systems influence phage-bacteria interactions, with a focus on phage therapy applications.
  • To explore the ecological factors affecting the distribution of antiphage systems.

Main Methods:

  • Literature review and synthesis of existing research on bacterial antiphage systems.
  • Analysis of two main hypotheses: pan-immunity and mobile genetic element (MGE) competition.
  • Discussion of ecological context and its influence on defense system distribution.

Main Results:

  • Antiphage system accumulation may serve community-level protection (pan-immunity) or protect intra-bacterial MGEs.
  • Ecological context significantly shapes antiphage system distribution and phage-bacteria interactions.
  • Multiple defense systems may not strongly limit phage host range at the species level, impacting phage therapy.

Conclusions:

  • Understanding the drivers of antiphage system distribution is crucial for their ecological role and optimizing phage therapy.
  • Further research is needed on factors like expression and costs influencing defense system prevalence.
  • The interplay between bacterial immunity and phage predation is complex and context-dependent.