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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Molecular Insights into Bacteriophage Evolution toward Its Host.

Marina de Leeuw1,2, Maayan Baron1, Oshrit Ben David1

  • 1Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Be'er Sheva 8410501, Israel.

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Bacteriophages (viruses infecting bacteria) adapted to new hosts by accumulating mutations, primarily in tail protein genes. This study shows specific tail mutations enhance predation on new bacterial species.

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Area of Science:

  • Microbiology
  • Virology
  • Evolutionary Biology

Background:

  • Bacteriophages (phages) are viruses that infect bacteria.
  • Phages are generally considered highly host-specific, but their evolutionary adaptation mechanisms are not fully understood.
  • Understanding phage speciation is crucial for phage therapy and microbial ecology.

Purpose of the Study:

  • To investigate the evolutionary adaptation of the broad host-range bacteriophage Aquamicrobium phage P14.
  • To identify genomic regions and specific mutations involved in phage adaptation to a new host.
  • To elucidate the role of phage tail proteins in host recognition and adaptation.

Main Methods:

  • A 21-day incubation experiment involving Aquamicrobium phage P14 and the Betaproteobacteria Alcaligenaceae H5.
  • Genome analysis and whole-genome comparison of the phage before and after incubation.
  • Control experiment with Aquamicrobium phage P14 and Alphaproteobacteria Aquamicrobium H8.

Main Results:

  • Increased predation efficacy of Aquamicrobium phage P14 towards Alcaligenaceae H5 was observed.
  • Mutations were concentrated in specific genomic regions, particularly genes encoding tail proteins (67% of high-frequency mutations).
  • Specific mutations in tail fiber and tail tubular protein B genes were identified during adaptation to Alcaligenaceae H5.

Conclusions:

  • The phage's tail apparatus is a critical factor in its adaptation to new bacterial hosts.
  • Mutations in phage genomes during host adaptation are primarily located in tail-related genes.
  • Further research is required to fully understand the adaptation mechanisms of Aquamicrobium phage P14.