Lysogeny
Lysogeny - Related Videos
03:33
Quantification of Bacterial Infection in Host Cells by the Colony-Forming Unit Assay
0 Views •
2025
This video demonstrates an in vitro quantification technique to determine Listeria monocytogenes infection of macrophages by the colony-forming unit assay. The bacterial colonies on the agar plate represent the intracellular bacterial population that escapes the host-defense mechanism and survives within the macrophages.
02:52
Inducing the Prophage Lytic Replication for Transcriptomic Analysis
0 Views •
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.
09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
0 Views •
Cited by 3 •
2017
Peptide competition assays are widely used in a variety of molecular and immunological experiments. This paper describes a detailed method for an in vitro oligopeptide-competing kinase assay and the associated validation procedures, which may be useful to find specific phosphorylation sites.
03:36
Preparation of Bacteriophage Lysate for Generalized Transduction
0 Views •
2026
Source: Saragliadis, A., et al. Producing Gene Deletions in Escherichia coli by P1 Transduction with Excisable Antibiotic Resistance Cassettes. J. Vis. Exp.(2018)This video demonstrates preparation of a bacteriophage lysate containing transducing particles. A donor strain is infected, plaques form, and the soft agar overlay is processed with chloroform to yield a clarified lysate for downstream analysis.
03:19
Inactivation of Bacteria Using Light-Activated Flavin Mononucleotide
0 Views •
2025
Source: Cheng, C., et al. Inactivation of Pathogens via Visible-Light Photolysis of Riboflavin-5′-Phosphate. J. Vis. Exp. (2022)This video demonstrates a method for evaluating the phototoxic effects of flavin mononucleotide (FMN) on pathogenic bacteria. Bacterial cultures are exposed to increasing concentrations of FMN and illuminated with visible light to generate reactive oxygen species (ROS) that damage cellular components. The surviving bacteria are then quantified to assess the...
FAQs
Integration places the phage genome within the bacterial chromosome, creating a prophage that is copied whenever the host DNA replicates. This arrangement allows viral genetic material to persist without immediately destroying the cell. Its maintenance depends on regulatory systems from both the phage and the bacterium, which help keep the integrated genome controlled during the lysogenic state.
Environmental stresses or other signals can trigger prophage induction, a transition in which the integrated phage genome excises from the bacterial chromosome. The released genome then initiates the lytic cycle, directing production of new phages and potentially causing bacterial cell lysis. This switch connects external conditions with a major change in virus-host behavior.
Lysogeny emphasizes genome persistence and host survival, because the phage genetic material remains associated with the bacterial chromosome and is replicated with host DNA. In contrast, the lytic pathway produces new phages directly and can culminate in destruction of the bacterium. The distinction is important for interpreting whether infection supports stable carriage or rapid phage release.
A useful analysis follows the phage genome from its integration into the bacterial chromosome, through replication with host DNA and regulatory control, to possible induction. If induction occurs, the next stages are excision, entry into the lytic cycle, production of new phages, and possible host-cell lysis. Tracking this sequence separates persistence from subsequent viral propagation.
Because a prophage is maintained within bacterial genetic material, lysogeny provides a context for examining how phage-associated genes can persist in bacterial populations. The overview identifies this process as relevant to horizontal gene transfer and bacterial evolution. Studying these relationships helps connect viral infection with changes in bacterial genomes and the spread of phage-encoded traits.
Research on lysogeny can clarify how viruses interact with bacterial hosts, how phage genomes are regulated while maintained in cells, and what conditions promote induction. It also supports investigation of horizontal gene transfer, bacterial evolution, and the distribution of phage-encoded traits. These applications make lysogeny relevant to both virus biology and broader studies of bacterial change.