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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Drosophila C virus ： ウィキペディア英語版 Drosophila C virus ''Drosophila'' C virus belongs to the genus ''Cripavirus'' and was previously thought to be a member of the virus family ''Picornaviridae''; it has since been classified as belonging to the ''Dicistroviridae''.〔(Genomes )〕 It is a single stranded positive sense RNA virus of approximately 9300 nucleotides and it contains two open reading frames.〔 The virus particles are 30 nm in diameter and are made up of approximately 30% of RNA and 70% protein.〔(Characterization of the Drosophila C Virus - Jousset et al. 34 (2): 269 - Journal of General Virology )〕 The virus capsid is composed of three major polypeptides and two minor polypeptides.〔 ''Drosophila'' C virus was first discovered in the early 1970s in a French strain of ''Drosophila melanogaster'',〔 but can also infect other ''Drosophila'' species in laboratory settings. The virus is transmitted by feeding and affects survival. However, experimental evidence has shown that when injected into adult flies the virus is pathogenic as it causes the adult flies to die within 3–4 days.〔 Antiviral RNAi has been shown to be an important host defence against DCV, and DCV encodes a viral suppressor of RNAi that sequesters double-stranded RNA to prevent antiviral RNAi targeting the virus. ''Drosophila'' that are infected with ''Drosophila'' C virus develop more quickly, the females have a greater number of ovarioles than uninfected flies.〔 Whilst based on this evidence it has been suggested DCV is a beneficial virus, this ignores the fact that the virus kills flies in only a few days (so total fitness in infected flies is still reduced),〔http://dx.doi.org/10.6084/m9.figshare.1297064 〕 and any changes in development time or ovariole number likely represent a host life history shift (parasite-induced fecundity compensation). Infection with ''Drosophila'' C virus can also increase the mortality rate within a ''Drosophila'' population. ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Drosophila C virus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.