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Strengthening phage resistance of Streptococcus thermophilus by leveraging complementary defense systems

Author

Listed:
  • Audrey Leprince

    (Université Laval)

  • Justine Lefrançois

    (Université Laval)

  • Anne M. Millen

    (3329 Agriculture Dr)

  • Damian Magill

    (CS 10010)

  • Philippe Horvath

    (CS 10010)

  • Dennis A. Romero

    (3329 Agriculture Dr)

  • Geneviève M. Rousseau

    (Université Laval)

  • Sylvain Moineau

    (Université Laval)

Abstract

CRISPR-Cas and restriction-modification systems represent the core defense arsenal in Streptococcus thermophilus, but their effectiveness is compromised by phages encoding anti-CRISPR proteins (ACRs) and other counter-defense strategies. Here, we explore the defensome of 263 S. thermophilus strains to uncover other anti-phage systems. The defense landscape of S. thermophilus is enriched by 21 accessory defense systems, 13 of which have never been investigated in this species. Experimental validation of 17 systems with 14 phages reveals a range of anti-phage activities, highlighting both broad and narrow specificities across the five viral genera infecting S. thermophilus. Synergies are observed when combining CRISPR immunity with accessory systems. We also assess the fitness cost associated with the chromosomal integration of these systems in their native context and find no impact under laboratory or industrial conditions. These findings underscore the potential of these accessory defense systems to enhance the resistance of S. thermophilus, particularly against ACR-encoding phages.

Suggested Citation

  • Audrey Leprince & Justine Lefrançois & Anne M. Millen & Damian Magill & Philippe Horvath & Dennis A. Romero & Geneviève M. Rousseau & Sylvain Moineau, 2025. "Strengthening phage resistance of Streptococcus thermophilus by leveraging complementary defense systems," Nature Communications, Nature, vol. 16(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62408-3
    DOI: 10.1038/s41467-025-62408-3
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    References listed on IDEAS

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