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Viruses with RNA Genomes01:29

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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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.
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Polydnaviruses: Nature's Genetic Engineers.

Michael R Strand1, Gaelen R Burke1

  • 1Department of Entomology, University of Georgia, Athens, Georgia 30602; email: mrstrand@uga.edu , grburke@uga.edu.

Annual Review of Virology
|March 10, 2016
PubMed
Summary
This summary is machine-generated.

Polydnaviruses are unique viruses that benefit their host, parasitoid wasps. These viruses act as mutualists, aiding wasps in manipulating other insects for parasitoid development.

Keywords:
developmentendogenous virus elementsevolutionimmunityparasitismsymbiosis

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Area of Science:

  • Virology
  • Insect biology
  • Evolutionary biology

Background:

  • Virus-host interactions are typically parasitic.
  • Polydnaviruses represent a unique class of viruses exhibiting mutualistic relationships with their hosts.
  • Parasitoid wasps utilize polydnaviruses to manipulate host insects during their parasitic development.

Purpose of the Study:

  • To review the evolutionary origins of polydnaviruses.
  • To examine the genomic organization and function of polydnaviruses.
  • To explore the roles of polydnaviruses in insect parasitism.

Main Methods:

  • Literature review of polydnavirus research.
  • Analysis of polydnavirus genome structure and function.
  • Synthesis of current knowledge on polydnavirus-host interactions.

Main Results:

  • Polydnaviruses are obligate mutualists of parasitoid wasps.
  • These viruses are vertically transmitted through wasp germ lines.
  • Polydnaviruses serve as gene delivery vectors for host manipulation.

Conclusions:

  • Polydnaviruses have a unique evolutionary origin tied to their wasp hosts.
  • Their genomes are adapted for gene delivery and host manipulation.
  • Understanding polydnaviruses offers insights into mutualistic virus-host dynamics and parasitism.