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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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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Actinobacteriophages: Genomics, Dynamics, and Applications.

Graham F Hatfull1

  • 1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA;

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Actinobacteriophages, viruses infecting Actinobacteria, exhibit vast genomic diversity. These phages offer tools for mycobacterial genetics and show potential for treating drug-resistant infections.

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bacteriophagegenomicsmycobacteriumphage therapy

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Area of Science:

  • Microbiology
  • Virology
  • Genomics

Background:

  • Actinobacteriophages are viruses targeting bacterial hosts within the Actinobacteria phylum.
  • Over 17,000 actinobacteriophages are known, with more than 3,000 complete genome sequences available.
  • Research initiatives like SEA-PHAGES have significantly contributed to actinobacteriophage discovery and characterization.

Purpose of the Study:

  • To explore the genomic diversity of actinobacteriophages.
  • To highlight the role of actinobacteriophages in mycobacterial genetics.
  • To assess the therapeutic potential of actinobacteriophages for treating infections.

Main Methods:

  • Genomic sequencing and comparative analysis of actinobacteriophages.
  • Investigating phage-host interactions and defense mechanisms.
  • Case study analysis of phage cocktail therapy.

Main Results:

  • Actinobacteriophages possess exceptionally diverse and mosaic genomes.
  • Phage-host dynamics drive genome evolution, including defense and counter-defense systems.
  • A three-phage cocktail demonstrated potential in treating drug-resistant Mycobacterium abscessus.

Conclusions:

  • Actinobacteriophages are a rich source of genomic diversity and evolutionary insights.
  • These phages provide valuable tools for advancing mycobacterial research and genetics.
  • Phage therapy presents a promising avenue for combating challenging mycobacterial infections.