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Viral Replication: Lysogenic Cycle

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...

Lytic Cycle of Bacteriophages

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...

Viral Replication: Lytic Cycle

Viral 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...

Lysogenic Cycle of Bacteriophages

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...

Size and Structure of Viral Genomes

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...

What are Viruses?

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Related Experiment Video

Updated: Mar 8, 2026

Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus

Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus

Published on: October 7, 2011

Communication between viruses guides lysis-lysogeny decisions.

Zohar Erez¹, Ida Steinberger-Levy^1,2, Maya Shamir¹

¹Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 7610001, Israel.

|January 19, 2017

Summary

Bacteriophages coordinate infection cycles using a novel peptide signaling system. This arbitrium system allows phages to assess previous infections and decide between replicating or entering dormancy.

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Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics

Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics

Published on: January 5, 2024

Area of Science:

Microbiology
Virology
Molecular Biology

Background:

Temperate viruses, or phages, exhibit a dual infection strategy: the lytic cycle (replication and host lysis) and the lysogenic cycle (dormancy within the host).
The decision between these cycles is crucial for phage survival and population dynamics.

Purpose of the Study:

To investigate the mechanism by which SPbeta group phages coordinate their lysis-lysogeny decisions.
To identify the molecular components involved in this communication system.

Main Methods:

Analysis of phage-host interactions during infection of Bacillus cells.
Identification and characterization of phage genes and peptide products involved in signaling.
Assessing the role of specific genes (aimP, aimR, aimX) in the communication system.

Main Results:

SPbeta phages utilize a small-molecule communication system, termed the 'arbitrium' system, to coordinate lysis-lysogeny decisions.
A six amino-acid peptide is produced and released by infecting phages, signaling to subsequent infections.
Phages lysogenize at higher rates when the communication peptide concentration is high, indicating a density-dependent decision.
Different phages encode distinct peptide variants, establishing a phage-specific communication code.
The arbitrium system is encoded by three genes: aimP (peptide production), aimR (receptor), and aimX (negative regulator).

Conclusions:

The arbitrium system allows descendant phages to 'communicate' with predecessors by estimating the frequency of recent infections.
This communication mechanism enables phages to optimize their infection strategy, choosing between lytic replication or lysogenic dormancy based on environmental cues.