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Sigma viruses : ウィキペディア英語版 | Sigma viruses
Sigma viruses are a clade of viruses in the family ''Rhabdoviridae'' that naturally infect dipterans, and have recently been proposed to represent a new genus of rhabdoviruses.〔Longdon B and Walker PJ (2011) Sigma virus genus proposal for the International Committee on Taxonomy of Viruses. http://talk.ictvonline.org/files/proposals/taxonomy_proposals_vertebrate1/m/vert02/4198.aspx〕 ==Discovery==
The sigma virus of Drosophila melanogaster (DMelSV) was discovered by a group of French researchers in 1937 〔L'Heritier P. H., Teissier G. 1937 Une anomalie physiologique héréditaire chez la Drosophile. C.R. Acad. Sci. Paris 231, 192–194.〕 after they observed certain fly lines became paralysed and died on exposure to carbon dioxide (which is commonly used as an anesthetic for Drosophila). They found the carbon dioxide sensitivity was caused by an infectious agent which they named sigma, and was later found to be a rhabdovirus.〔L'Heritier, P. (1957). "The hereditary virus of Drosophila." Advances in Virus Research 5: 195-245.〕 More recently new sigma viruses have been discovered in six species of diptera; five in species of ''Drosophila'' and one in the family ''Muscidae''.〔Longdon B, Obbard DJ and Jiggins FM (2010) Sigma viruses from three species of Drosophila form a major new clade in the rhabdovirus phylogeny. Proceedings of the Royal Society B. 277 (1698): 35-44. http://rspb.royalsocietypublishing.org/content/277/1678/35.abstract〕〔Longdon B, Wilfert L, Osei-Poku J, Cagney H, Obbard DJ, Jiggins FM (2011) Host-switching by a vertically transmitted rhabdovirus in Drosophila Biology Letters 7(5):747-750. http://rsbl.royalsocietypublishing.org/content/7/5/747.full.pdf+html〕
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