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Related Concept Videos

DNA Bacteriophages01:26

DNA Bacteriophages

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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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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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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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New insights into intestinal phages.

R Sausset1,2, M A Petit1, V Gaboriau-Routhiau1,3,4

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Intestinal phages, viruses that infect gut bacteria, are increasingly studied. Their exact role in gut health and disease remains unclear, despite new discoveries.

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Area of Science:

  • Microbiology
  • Virology
  • Gastroenterology

Background:

  • The intestinal microbiota is crucial for human health.
  • The viral component, primarily bacteriophages, is gaining research attention.
  • Advances in viral metagenomics have revealed novel phage families.

Purpose of the Study:

  • To review current knowledge on intestinal phages.
  • To discuss phage identity, lifestyles, and effects on gut microbiota.
  • To highlight phage interactions with the immune system.

Main Methods:

  • Literature review of viral metagenomics studies.
  • Analysis of existing data on phage composition and function.
  • Synthesis of findings on phage-host interactions.

Main Results:

  • Numerous novel phage families have been identified.
  • Phage community changes are noted in various diseases.
  • The direct impact of phages on gut microbiota structure is still poorly understood.

Conclusions:

  • Further research is needed to clarify the role of intestinal phages in health and disease.
  • Understanding phage-immune system interactions is essential.
  • Phages may directly influence gut microbiota composition and function.