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United States Department of Agriculture

Agricultural Research Service

Title: Family Tymoviridae (Book Chapter In: Virus Taxonomy: Viith Report of the International Committee on Taxonomy of VIRUSES.)

item Edwards, Michael
item Hammond, Rosemarie

Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: April 5, 2003
Publication Date: January 1, 2005
Citation: Dreher, T.W., Edwards, M.C., Gibbs, A.J., Haenni, A.-L., Hammond, R.W., Jupin, I., Koenig, R., Sabanadzovic, S., Abou Ghanem-Sabanadzovic, N., Martelli, G.P. 2005. Family tymoviridae. In: Fauquet, C.M., Mayo, M.A., Maniloff, J., Desselberger, U., Ball, L.A. editors. Virus Taxonomy: VIIIth Report of the International Committee on Taxonomy of Viruses. San Diego: Elsevier/Academic Press. p. 1067-1076.

Technical Abstract: This chapter provides an overview of the family Tymoviridae, a newly formed family comprised of the genera Tymovirus, Marafivirus, and Maculavirus. Several viruses have been identified and new relationships have been discovered since the publication of the last International Committee on the Taxonomy of Viruses report. Grapevine asteroid mosaic-associated virus and Grapevine rupestris vein feathering virus are now tentative members of the Marafivirus genus. Although neither is insect-transmitted, both have a very narrow host range and are confined to the phoem of infected plants. Partial sequence data suggests a genome organization matching that of the known marafiviruses. The genus Maculavirus is new and the name is derived from macula (Latin for fleck). Grapevine red globe virus is tentatively a new member of this genus. As with Grapevine fleck virus, the GRGV genome is organized similarly to the genomes of other viruses in the family, but lacks a tymobox/marafibox sequence and contains an additional open reading frame near its 3' terminus. Poinsettia mosaic virus is now considered an unassigned member of the family. Although sequence analysis indicates a close similarity to the genomes of marafiviruses, the biology of PnMV is distinctly different than that of any marafivirus and more reminiscent of the genus Tymovirus. A phylogenetic analysis illustrating the relationships among the members of the family is presented.

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