Lytic Cycle
Lytic Cycle - Related Videos
01:30
Lytic Cycle of Bacteriophages
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2019
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...
01:20
Viral Replication: Lytic Cycle
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2025
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...
00:43
Lysogenic Cycle of Bacteriophages
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2019
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...
11:28
Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
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Cited by 2 •
2011
We describe a protocol to identify key roles of host signaling molecules in lytic replication of a model herpesvirus, gamma herpesvirus 68 (γHV68). Utilizing genetically modified mouse strains and embryonic fibroblasts for γHV68 lytic replication, the protocol permits both phenotypic characterization and molecular interrogation of virus-host interactions in viral lytic replication.
02:52
Inducing the Prophage Lytic Replication for Transcriptomic Analysis
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2026
Source: Krishnamurthi, R., et al. Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics. J. Vis. Exp. (2024)This video demonstrates the induction of lytic replication in a prophage integrated into the bacterial genome and the capture of gene expression changes through timed sampling for transcriptomic analysis.
FAQs
The lytic cycle's central mechanism is resource redirection: viral genetic material causes the host cell to prioritize viral nucleic-acid and protein production. Host enzymes, ribosomes, and metabolic resources therefore become tools for building viral components. This explains how one infected cell can support formation of multiple progeny virions before cellular integrity is lost.
Viral nucleic acids and proteins are produced as coordinated outputs of redirected host activity. Nucleic-acid synthesis supplies genetic material, while protein synthesis supplies structural and other components needed for progeny assembly. Their subsequent combination converts separate molecular products into complete viral particles, making assembly a critical bridge between takeover of the cell and release.
In many bacteriophages, viral enzymes weaken the bacterial cell wall after new particles have formed. This structural damage allows the host cell to rupture, releasing the assembled phages into the surrounding environment. Cell-wall weakening therefore connects intracellular production with the extracellular spread of progeny particles and contributes directly to host-cell damage.
Rapid spread results from the combination of host-cell takeover, progeny assembly, and release through rupture. Once a cell has produced new virions, those particles leave the damaged host and can participate in further infection. The cycle therefore amplifies viral presence while simultaneously reducing the integrity of infected cells.
The process links viral replication with direct injury to the infected cell. Viral redirection of enzymes, ribosomes, and metabolic resources deprives normal cellular activity of those resources, while eventual rupture causes additional damage. Studying these events helps explain how viral reproduction produces host-cell injury and contributes to disease-associated pathogenesis.
The cycle identifies several connected events that research can examine: entry of viral genetic material, redirection of host resources, production of viral components, assembly, and release. Understanding these events can guide investigation of antiviral strategies aimed at viral replication and support phage-based biotechnology by clarifying how bacteriophages produce and release progeny particles.