Related Experiment Video
Updated: Jun 22, 2026
11:28
Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
Published on: October 7, 2011
Slowly replicating lytic viruses: pseudolysogenic persistence and within-host competition
Jingshan Zhang1, Eugene I Shakhnovich
1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|June 13, 2009
Summary
Viral replication rates determine virus survival. A specific range allows persistence, while competition can lead to coexistence of strains with differing replication speeds.
Area of Science:
- Virology
- Population Dynamics
- Mathematical Biology
Background:
- Lytic viruses replicate within host cells, impacting host populations.
- Viral replication rates are critical for viral persistence and host survival.
- Understanding viral population dynamics is essential in biological and medical contexts.
Purpose of the Study:
- To investigate the population dynamics of lytic viruses in dividing host cells.
- To determine the range of viral replication rates that permit viral persistence.
- To analyze the competitive dynamics between viral strains with different replication rates.
Main Methods:
- Mathematical modeling of viral population dynamics.
- Analysis of viral replication rates in relation to host cell division.
- Simulation of within-host competition between viral strains.
Main Results:
- A specific range of viral replication rates was identified as crucial for viral persistence.
- Rates too high lead to host extinction; rates too low lead to viral dilution.
- In competition, a strain with a 'stable' replication rate can outcompete others.
- Coexistence of strains with replication rates above and below the stable value was observed.
Conclusions:
- Viral replication rate is a key factor governing virus-host population dynamics.
- A defined 'persistence range' of replication rates is necessary for viral survival.
- Viral competition dynamics can result in strain coexistence rather than single-strain dominance.
Related Concept Videos
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...
01:30Lytic 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...
01:26Size 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...
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...
01:10Retrovirus Life Cycles
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...