| 词条 | Okavirus | ||||||||||||||||||||||||||||
| 释义 |
| image = | image_alt = | image_caption = | taxon = Tipravirus | authority = | synonyms = | synonyms_ref = | type_species = Gill-associated virus | subdivision_ranks = Species | subdivision =
}} Okavirus is a genus of viruses in the order Nidovirales, in the family Roniviridae. Okaviruses infect crustaceans, mostly prawns. There is currently only one species in this genus: the type species Gill-associated virus. Diseases associated with this genus include: GAV: reddening, biofouling with exoparasites, emaciation, massive mortality; YHV: yellow head, arrest of feeding. massive mortality.[1][2] The name is derived from the 'Oka' or lymphoid organ in which the viruses are commonly detected and in which pathology occurs during acute infections. Lymphoid organs are anatomical structures common to penaeid shrimp. TaxonomyGroup: ssRNA(+){{Collapsible list|title= Order: Nidovirales|1={{Collapsible list| framestyle=border:none; padding:1.0em;|title=Family: Roniviridae |1={{hidden begin|title=Genus: Okavirus}}
}} }}[2] Two virus species are recognized in this genus: Gill-associated virus and Yellow head virus. Both species were isolated from prawns.[3][4] StructureViruses in Okavirus are enveloped, with bacilliform geometries, and helical symmetry. The diameter is around 20-30 nm. Genomes are linear and non-segmented, around 26kb in length.[1]
Life cycleEntry into the host cell is achieved by attachment to host receptors, which mediates endocytosis. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Crustaceans and mostly prawns serve as the natural host. Transmission routes are ingestion.[1]
References1. ^1 2 {{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/290.html|publisher=ExPASy|accessdate=15 June 2015}} 2. ^1 {{cite web|last1=ICTV|title=Virus Taxonomy: 2014 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=15 June 2015}} 3. ^Cowley JA, Dimmock CM, Spann KM, Walker PJ (2000) Gill-associated virus of Penaeus monodon prawns: an invertebrate virus with ORF1a and ORF1b genes related to arteri- and coronaviruses. J Gen Virol 81(Pt 6):1473–1484 4. ^Sittidilokratna N, Dangtip S, Cowley JA, Walker PJ (2008) RNA transcription analysis and completion of the genome sequence of yellow head nidovirus. Virus Res 136(1–2):157–165 External links
1 : Roniviridae |
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