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Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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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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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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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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Following Cell-fate in E. coli After Infection by Phage Lambda
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Emerging methods to study bacteriophage infection at the single-cell level.

Vinh T Dang1, Matthew B Sullivan2

  • 1Department of Ecology and Evolutionary Biology, University of Arizona Tucson, AZ, USA.

Frontiers in Microbiology
|January 8, 2015
PubMed
Summary

New single-cell methods improve understanding of phage-host interactions, crucial for tracking bacterial infections and ecosystem health. These techniques offer precise insights into virus-bacteria dynamics in diverse environments.

Keywords:
digital PCRinfection strategyphageFISHphage–bacteria interactionsingle-cell amplified genome

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Area of Science:

  • Microbiology
  • Ecology
  • Genomics

Background:

  • Bacteria and their viruses (phages) are vital to ecosystems, influencing biogeochemical cycles and disease.
  • Current methods struggle to accurately assess phage host specificity and infection dynamics in natural settings.
  • Understanding these interactions is key to predicting ecological and evolutionary impacts.

Purpose of the Study:

  • To review emerging single-cell level methods for studying phage-host interactions.
  • To highlight techniques that offer high resolution in complex microbial communities.
  • To enable quantitative, spatiotemporal studies of phage-bacteria dynamics.

Main Methods:

  • Leveraging sequence data to identify virus signals in single-cell amplified genomes.
  • Utilizing digital PCR and phageFISH for targeted phage-bacteria pair identification.
  • Applying these methods to environmental samples, including uncultured bacteria.

Main Results:

  • Single-cell techniques provide unprecedented resolution for phage-host interaction studies.
  • Digital PCR and phageFISH enable analysis in complex, uncultured microbial communities.
  • PhageFISH can differentiate various phage-host interaction outcomes (lytic, chronic, lysogenic).

Conclusions:

  • Emerging single-cell methods revolutionize the study of phage-bacteria interactions.
  • These techniques allow for quantitative, ecosystem-wide analysis of phage-host dynamics.
  • This research will enhance our ability to predict the ecological and evolutionary consequences of phage-bacteria pairings.