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ICTV Virus Taxonomy Profile: Chrysoviridae.

Said A Ghabrial1, José R Castón2, Robert H A Coutts3

  • 1Department of Plant Pathology, University of Kentucky, Lexington, KY 40546, USA.

The Journal of General Virology
|December 19, 2017
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Summary

Chrysoviridae are small, non-enveloped viruses with segmented dsRNA genomes. These viruses replicate intracellularly and lack known natural vectors, with transmission occurring through spores or hyphal anastomosis.

Keywords:
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Area of Science:

  • Virology
  • Mycoviruses
  • Taxonomy

Background:

  • Chrysoviridae are small, isometric, non-enveloped viruses with segmented double-stranded RNA (dsRNA) genomes.
  • Genome segments are individually encapsidated, totaling 11.5-12.8 kbp, and belong to the single genus Chrysovirus, comprising nine species.
  • These viruses lack an extracellular phase and are transmitted intracellularly via spores or hyphal anastomosis, with no known natural vectors.

Purpose of the Study:

  • To summarize the International Committee on Taxonomy of Viruses (ICTV) report on the taxonomy of the Chrysoviridae family.
  • To provide an updated classification and overview of the Chrysoviridae.
  • To consolidate current knowledge on chrysoviruses for researchers.

Main Methods:

  • Review and synthesis of the latest ICTV taxonomic data.
  • Analysis of viral characteristics including morphology, genome structure, and replication strategies.
  • Compilation of information on transmission routes and vector absence.

Main Results:

  • The Chrysoviridae family is formally defined with a single genus, Chrysovirus, containing nine species.
  • Detailed characterization of chrysoviruses, including their physical dimensions (40 nm diameter) and genome composition (segmented dsRNA).
  • Elucidation of the intracellular transmission mechanisms and the absence of extracellular phases or natural vectors.

Conclusions:

  • The ICTV report provides a standardized taxonomy for the Chrysoviridae family.
  • Understanding chrysovirus biology, particularly their unique transmission, is crucial for mycology and virology.
  • Further research may focus on the ecological roles and host interactions of these viruses.