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Crinivirus
''Crinivirus'', formerly the ''lettuce infectious yellows virus group'', is a genus of viruses , in the family Closteroviridae. They are linear, single-stranded positive sense RNA viruses (and are therefore group IV).〔ICTVdB Management (2006). 00.017.0.02. Crinivirus. In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA〕 There are currently 13 species in this genus including the type species Lettuce infectious yellows virus. Diseases associated with this genus include: yellowing and necrosis, particularly affecting the phloem.〔(【引用サイトリンク】url=http://viralzone.expasy.org/all_by_species/287.html )〕〔(【引用サイトリンク】title=Virus Taxonomy: 2014 Release )〕
Examples of species whose entire genomes have been sequenced that are currently classified into the genus include the Sweet potato chlorotic stunt virus (SPCSV) and the Lettuce infectious yellows virus (LIYV).〔Journal of Virology. 2002 September; 76(18): 9260–9270〕〔ICTVdB Management (2006)〕
== Genetics ==
The viruses of this genus have segmented, bipartite genomes that add up to 7,500–19,500 nucleotides in length. Their genomes also code for proteins that do not form part of the virion particles as well as structural proteins. The Universal Virus Database describes that their genome sequences near their 3'-ends are capable of hairpin-loop formation and also believe that their 5'-ends may have methylated caps.〔 Each of the viral RNA molecules contains four hair-pin structures and a pseudoknot in the 3'UTR. The pseudoknot is unusual in that it contains a small stem-loop structure inside loop L1. In the related genus Closterovirus, these secondary structures have been found to be important in viral RNA replication.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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