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Related Concept Videos

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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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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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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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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Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

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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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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Bacteriophage Effectiveness for Biocontrol of Foodborne Pathogens Evaluated via High-Throughput Settings
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Fast phages outcompete by depleting host resources.

Josie Elliott1, Anne Chevallereau1

  • 1Molecular Microbiology and Structural Biochemistry (MMSB), CNRS UMR 5086, Université Claude Bernard Lyon 1, Lyon, France.

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Bacterial coinfection by phages is common. Researchers found that faster phage assembly allows one phage to outcompete another during coinfection, impacting bacterial resistance strategies.

Keywords:
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Area of Science:

  • Microbiology
  • Virology
  • Evolutionary Biology

Background:

  • Bacteriophages (phages) are viruses that infect bacteria.
  • Phages often coinfect bacterial hosts, leading to competition between different phage species.
  • Phage therapy utilizes phage cocktails to overcome bacterial resistance.

Purpose of the Study:

  • To investigate the competition dynamics between two virulent phages.
  • To determine the factors influencing phage dominance in coinfection scenarios.

Main Methods:

  • Experimental setup involving coinfection of bacterial hosts with two distinct virulent phages.
  • Quantification of phage populations over time to assess competition outcomes.
  • Analysis of phage assembly rates as a potential determinant of competitive success.

Main Results:

  • One phage species demonstrated dominance over the other in coinfection.
  • Faster phage assembly was identified as the key factor enabling competitive advantage.
  • This finding has implications for understanding phage ecology and optimizing phage therapy.

Conclusions:

  • Phage assembly rate is a critical factor in inter-phage competition.
  • Understanding these dynamics can inform the development of more effective phage-based treatments against bacterial infections.