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Related Concept Videos

Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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 lytic replication...
Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

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 its...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
DNA Bacteriophages01:26

DNA Bacteriophages

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...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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...
CRISPR and crRNAs02:53

CRISPR and crRNAs

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.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...

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Related Experiment Video

Updated: May 21, 2026

Bacteriophage Removal from Infected Salmonella Cultures
07:19

Bacteriophage Removal from Infected Salmonella Cultures

Published on: June 28, 2024

Bacterial 'immunity' against bacteriophages.

Stephen T Abedon1

  • 1Department of Microbiology; The Ohio State University; Mansfield, OH USA.

Bacteriophage
|June 6, 2012
PubMed
Summary

Bacteria use innate and adaptive immune strategies against phages, similar to animals. This includes CRISPR/Cas systems and other non-adaptive defenses, offering a unified view of bacterial anti-phage immunity.

Area of Science:

  • Microbiology
  • Immunology
  • Bacteriology

Background:

  • Vertebrate animals have adaptive and innate anti-pathogen defenses.
  • Bacteria also possess diverse mechanisms to defend against bacteriophages.

Purpose of the Study:

  • To frame bacterial anti-phage defenses using an analogy to animal immune systems.
  • To integrate various bacterial anti-phage mechanisms into a unified immunological perspective.

Main Methods:

  • Comparative analysis of bacterial anti-phage strategies.
  • Conceptual framework drawing parallels between animal and bacterial immunity.

Main Results:

  • Bacterial anti-phage defenses can be categorized into adaptive (e.g., CRISPR/Cas) and innate (non-adaptive) systems.

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Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics

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T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo
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T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo

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Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics

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T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo

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  • Numerous non-adaptive anti-phage mechanisms constitute an 'innate bacterial immunity'.

    • Conclusions:

    • Recognizing innate bacterial immunity provides novel insights into bacterial anti-phage defense.
    • A unified immunological approach can better understand the spectrum of bacterial anti-phage strategies.