Single Cycle Virus
Single Cycle Virus - Related Videos
08:31
Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
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Cited by 2 •
2013
Single Virus Genomics (SVG) is a method to isolate and amplify the genomes of single virons. Viral suspensions of a mixed assemblage are sorted using flow cytometry onto a microscope slide with discrete wells containing agarose, thereby capturing the virion and reducing genome shearing during downstream processing. Whole genome amplification is achieved using multiple displacement amplification (MDA) resulting in genomic material that is suitable for sequencing.
09:35
Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
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Cited by 2 •
2017
Here we describe a newly developed hepatitis B virus (HBV) reporter system to monitor the early stages of the HBV life cycle. This simplified in vitro system will aid in the screening of anti-HBV agents using a high-throughput strategy.
04:12
Isolation of a Single Giant Virus from a Mixed Viral Population Using Amoebae
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2026
Source: Sahmi-Bounsiar, D. et al. Single Cell Micro-aspiration as an Alternative Strategy to Fluorescence-activated Cell Sorting for Giant Virus Mixture Separation. J. Vis. Exp. (2019)This video demonstrates single-cell micro-aspiration to isolate and expand a single giant virus population from a mixed viral population using amoebae as host cells.
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...
00:50
What are Viruses?
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2019
Overview A virus is a microscopic infectious particle that consists of an RNA or DNA genome enclosed in a protein shell. It is not able to reproduce on its own: it can only make more viruses by entering a cell and using its cellular machinery. When a virus infects a host cell, it removes its protein coat and directs the host’s machinery to transcribe and translate its genetic material. The hijacked cell assembles the replicated components into thousands of viral progeny, which can rupture and...
FAQs
The engineered genome preserves instructions needed for cell entry, viral gene expression, and genome replication. However, it omits an essential component required to generate infectious progeny. During virus production, specialized complementing cells provide that missing function, allowing particles to be prepared without restoring unrestricted spread.
The missing component acts as the built-in restriction on the viral life cycle. Without it, the system can support entry and genome replication but cannot efficiently produce infectious descendants for continued transmission. This distinction lets investigators examine what happens after a virus enters a cell without conflating those events with onward spread.
A Single Cycle Virus is designed to permit one infection cycle rather than successive rounds of infectious spread. That limitation separates the consequences of initial entry and replication from effects caused by newly produced virus infecting additional cells. Researchers can therefore study viral processes under conditions where transmission is deliberately constrained.
The critical production condition is the use of specialized complementing cells that supply the essential component absent from the viral genome. This supplementation permits formation of infectious virus for experimental use, while the resulting design retains the intended block on completing additional infectious cycles in the research setting. The approach links particle production with biological containment.
Researchers can apply Single Cycle Virus systems when they need to distinguish antiviral responses associated with viral entry, replication, or transmission. The restricted system also supports evaluation of host-virus interactions under controlled laboratory conditions. In addition, its limited spread makes it relevant to exploring safer vaccine and gene-delivery platforms.
These systems can reveal whether a biological response is associated with viral entry, genome replication, or the ability to transmit infection onward. Because the life cycle is intentionally restricted, researchers can interpret host responses without the same contribution from continuing rounds of spread. This makes the model useful for controlled studies of host-virus interactions and antiviral responses.