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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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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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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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Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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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

Lysogenic Cycle of Bacteriophages

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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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Targeted Single-Phage Isolation Reveals Phage-Dependent Heterogeneous Infection Dynamics.

Magdalena Unterer1,2, Mohammadali Khan Mirzaei1,2, Li Deng1,2

  • 1Institute of Virology, Helmholtz Centre Munich, German Research Centre for Environmental Health, Neuherberg, Germany.

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Summary

New phage isolation methods enable targeted selection of therapeutic bacterial viruses. This approach identifies effective phages while excluding harmful traits and reveals single-cell variations in phage infection dynamics.

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bacteriophagesflow cytometrysingle-cell analysis

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Area of Science:

  • Microbiology
  • Virology
  • Biotechnology

Background:

  • Antibiotic resistance poses a critical global health threat, necessitating alternative treatments for multidrug-resistant infections.
  • Bacteriophage (phage) therapy, utilizing bacterial viruses, is a promising alternative to antibiotics.
  • Isolating effective phages with desirable therapeutic properties and without undesirable traits (e.g., virulence factors) is a significant challenge.

Purpose of the Study:

  • To develop a targeted single-phage isolation method for efficient detection and characterization of therapeutic phages.
  • To high-throughput characterize phage kinetics and identify phages lacking undesirable bacterial traits.
  • To investigate single-cell variations in phage-bacterium interactions during infection.

Main Methods:

  • Development of a targeted single-phage isolation technique based on phage similarity to known isolates.
  • High-throughput screening for phage kinetics and exclusion of phages carrying bacterial virulence factors.
  • Single-cell analysis of phage-infected bacterial populations.

Main Results:

  • Successful isolation and characterization of specific phages with therapeutic potential.
  • Identification of phages lacking undesirable traits such as bacterial toxins.
  • Observation of significant cell-to-cell variations in phage kinetics at the single-cell level, even among infections with the same phage species.

Conclusions:

  • The developed method facilitates the isolation and characterization of suitable phages for phage therapy.
  • The study highlights the importance of single-cell analysis in understanding phage-bacterium interactions.
  • This work contributes to advancing phage therapy as a viable alternative to antibiotics for multidrug-resistant infections.