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Related Concept Videos

Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Lytic Cycle of Bacteriophages01:30

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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...
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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...
Introduction to Virus01:28

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Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
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Related Experiment Video

Updated: May 25, 2026

Isolation and Genome Analysis of Single Virions using 'Single Virus Genomics'
08:31

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Published on: May 26, 2013

Tripartite warfare: decoding the cell-virus-virophage arms race.

Ting Chu1, Yongjie Wang1,2

  • 1College of Food Science and Technology, Shanghai Ocean University, Shanghai, China.

Critical Reviews in Microbiology
|May 23, 2026
PubMed
Summary

Giant viruses and virophages form complex tripartite interactions with host cells. This review explores these relationships, focusing on molecular mechanisms and ecological implications.

Keywords:
CVvGiant virustripartite interactionvirophage

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Area of Science:

  • Virology
  • Microbiology
  • Ecology

Background:

  • Giant viruses are large double-stranded DNA (dsDNA) viruses with complex genomes and structures.
  • Virophages are small dsDNA viruses that parasitize giant viruses, creating a unique parasitic-symbiotic dynamic.
  • These interactions occur within diverse eukaryotic hosts, including protists.

Purpose of the Study:

  • To review the tripartite relationship between host cells, giant viruses, and virophages (CVv systems).
  • To examine virus-host interactions in various protist hosts.
  • To elucidate the molecular mechanisms, ecological, and evolutionary implications of these viral interactions.

Main Methods:

  • Literature review of studies on giant viruses, virophages, and their hosts.
  • Analysis of molecular mechanisms governing virus-host and virus-virus interactions.
  • Synthesis of ecological and evolutionary data related to CVv systems.

Main Results:

  • Giant viruses and virophages engage in intricate interactions within host cells, influencing each other's replication.
  • The relationship benefits the host cell by suppressing giant virus progeny.
  • These interactions have significant ecological and evolutionary consequences.

Conclusions:

  • Understanding the molecular basis of interactions in CVv systems is crucial.
  • Further research is needed to address current challenges in studying these complex viral systems.
  • Future directions include exploring the molecular underpinnings of viral interplay in CVv systems.