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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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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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Viral Replication: Lysogenic Cycle01:16

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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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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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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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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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Gut Bacteriophage: Current Understanding and Challenges.

Thomas D S Sutton1, Colin Hill1

  • 1APC Microbiome Ireland and School of Microbiology, University College Cork, Cork, Ireland.

Frontiers in Endocrinology
|December 19, 2019
PubMed
Summary
This summary is machine-generated.

The human gut virome, dominated by bacteriophages, significantly impacts health but remains poorly understood. Future research requires robust methods to analyze viral sequences and understand their role in the gut microbiome dynamics.

Keywords:
bacteriophagemicrobiomemicrobiotaphage-host interactionsvirome

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Area of Science:

  • Microbiology
  • Virology
  • Bioinformatics

Background:

  • The human gut microbiome influences health, with bacteriophages playing key roles in microbial community structure and function.
  • Bacteriophages are the dominant viral agents in the gut but are largely uncharacterized due to limited database homology.
  • Understanding bacteriophage dynamics is crucial for deciphering their impact on the human microbiome and overall health.

Purpose of the Study:

  • To review current knowledge of the human gut virome and bacteriophage roles.
  • To assess the challenges and limitations in current virome research methods.
  • To propose solutions for establishing a robust foundation for future virome studies.

Main Methods:

  • Review of existing literature on human gut virome and bacteriophage research.
  • Analysis of sequence-based approaches and *in silico* tools for virome characterization.
  • Discussion of methodological variations and their impact on study comparability.

Main Results:

  • Bacteriophages are critical but understudied components of the gut microbiome.
  • Current analytical methods for virome data are inconsistent, hindering comparative studies.
  • The field faces challenges in establishing reliable methods for understanding viral populations.

Conclusions:

  • The human virome is a complex and vital area of microbiome research.
  • Standardized and robust methodologies are essential for advancing gut bacteriophage research.
  • Addressing current challenges will enable a deeper understanding of the virome's role in human health.