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Lytic Cycle of Bacteriophages01:30

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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DNA Bacteriophages01:26

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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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Lysogenic Cycle of Bacteriophages00:43

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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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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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Microorganisms in Medicine and Therapeutics01:29

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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Viral Replication: Lytic Cycle01:20

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Author Spotlight: Investigating Bacteriophage-Induced Immune Responses in Gnotobiotic Mice
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Host-phage interactions and modeling for therapy.

Joshua Williams1, Nathan Burton1, Gurneet Dhanoa1

  • 1School of Life Sciences, University of Warwick, Coventry, United Kingdom.

Progress in Molecular Biology and Translational Science
|September 22, 2023
PubMed
Summary
This summary is machine-generated.

Bacteriophages (phage) are crucial ecological players with therapeutic potential. Understanding phage-host interactions is vital for developing phage therapy as a viable alternative to antibiotics.

Keywords:
AdsorptionAnimal modelsClinical trialsGram-negativeGram-positivePhage therapyPhage-host interaction

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Area of Science:

  • Microbiology
  • Ecology
  • Biotechnology

Background:

  • Bacteriophages (phage) are ubiquitous viruses that infect bacteria, playing significant roles in microbial ecology.
  • Phage therapy presents a promising alternative to conventional antibiotics due to rising antimicrobial resistance.
  • Effective phage therapy relies on a comprehensive understanding of phage-host interactions.

Purpose of the Study:

  • To discuss the mechanisms of phage-host interactions throughout the phage life cycle.
  • To examine models used for developing phage therapeutics.
  • To review progress in clinical applications of phage therapy.

Main Methods:

  • Literature review of phage life cycle mechanisms.
  • Analysis of various experimental models for phage therapy development.
  • Examination of clinical studies on phage therapy.

Main Results:

  • Phage interact with hosts via diverse mechanisms during infection and release.
  • Different models are employed to study phage-host dynamics and therapeutic potential.
  • Progress is being made in translating phage therapy into clinical practice.

Conclusions:

  • Understanding phage-host interactions is key to unlocking the full potential of phage therapy.
  • Continued research and model development are essential for advancing phage-based antimicrobial strategies.
  • Phage therapy holds significant promise for combating bacterial infections.