Tymoviridae are monopartite single-stranded positive sense RNA plant viruses, belonging to group IV of the Baltimore classification of viruses. The Tymoviridae are a relatively new family, only approved in 2002.

Virology [link]

The virons are non-enveloped and isometric with a diameter of around 30 nm, with an icosahedral structure and a triangulation number (T) = 3.

The linear genome is between of 6-7.5 kilobases in length and encodes one large open reading frame. It is capped at the 5’ terminus. The 3’ terminus may have a tRNA-like structure or a polyA tract, depending upon the species. The genome is relatively cytosine rich.

Taxonomy [link]

The largest of three genera is Tymovirus with 25 species, whereas the other genera, Marafivirus and Maculavirus have 5 and 1 species respectively.

The Tymoviridae family includes the following genera:

• Genus Maculavirus
  • Bombyx mori Macula-like virus
  • Grapevine fleck virus (type species)

• Genus Marafivirus
  • Maize rayado fino virus (type species)

• Genus Tymovirus
  • Asclepias asymptomatic virus
  • Turnip yellow mosaic virus (type species)

Unclassified viruses

• Fig fleck-associated virus
• Olive latent virus 3

References [link]

• Martelli GP. Sabanadzovic S. Abou-Ghanem Sabanadzovic N. Edwards MC. Dreher T. (2002). The family Tymoviridae. Archives of Virology. 147(9):1837-46
• University of Leicester Microbiology
• ICTV Virus Taxonomy 2009 [1]
• UniProt Taxonomy [2]

External links [link]

• Viralzone: Tymoviridae

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