Related Experiment Video
Updated: Aug 5, 2026
09:23
Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics
Published on: January 5, 2024
To lyse or not to lyse: biasing bacteriophage behaviors
Rabia Fatima1, Gayatri Nair1, Amany Al-Anany2
1Department of Medicine, McMaster University, Hamilton, Canada.
Microbiology and Molecular Biology Reviews : MMBR
|August 4, 2026
Summary
Bacteriophages decide between lysis and lysogeny (dormancy) based on various signals. Understanding this critical gene regulation choice impacts bacteriology, from culturing bacteria to antibiotic treatment success.
Area of Science:
- Molecular Biology
- Microbiology
- Genetics
Background:
- Temperate bacteriophages exhibit a critical choice between lysis (replication and host cell destruction) and lysogeny (dormant integration into the bacterial genome).
- Over 75% of bacterial genomes harbor dormant bacteriophages, highlighting the widespread biological significance of this decision.
- This phage decision-making process is often studied independently of broader bacteriology, potentially limiting comprehensive understanding.
Purpose of the Study:
- To review the intricate mechanisms governing the bacteriophage lysis-lysogeny decision.
- To explore the diverse environmental and cellular signals influencing this choice.
- To elucidate the impact of this decision on bacterial populations and its relevance to clinical applications.
Main Methods:
- Review of existing literature on bacteriophage gene regulation.
- Analysis of molecular pathways involved in signal transduction and decision-making.
- Synthesis of findings related to phage-host interactions and population dynamics.
Main Results:
- Bacteriophages respond to a wide array of signals to determine lysis or lysogeny.
- The timing of the lysis-lysogeny decision significantly affects its outcome.
- Phage-phage interactions also play a role in modulating this decision.
Conclusions:
- The lysis-lysogeny decision is a fundamental process in bacteriology with far-reaching implications.
- Understanding and potentially biasing this decision can explain bacterial culturing challenges.
- Insights into this decision can enhance the effectiveness of antibiotic treatments.
Related Concept Videos
01:30Lytic 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...
01:16Viral 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...
00:43Lysogenic 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...
01:20Viral Replication: Lytic Cycle
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...
01:26DNA 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...
01:23Bacteriophages of the Human Virome
Bacteriophages are found throughout the human body. They may even outnumber eukaryotic viruses, forming an important and dynamic component of the human virome. Indeed, phages represent the most abundant viral entities, with densities in the gut reaching up to 10⁹ particles per gram of fecal matter, and many belonging to orders such as Caudovirales and Microviridae, while a substantial proportion remains unclassified as viral “dark matter.”Lysogeny and Genetic ExchangeIn the gut, bacteriophages...