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{{Short description|Genus of viruses}} |
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{{virusbox |
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| image = Narnaviridae virion.jpg<!--RdRp_and_RNA_genome.png--> |
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| image2_caption = Narnaviruses have no [[capsid]] or [[viral envelope]], [[RNA]] genome and [[RNA-dependent RNA polymerase|RdRp]] form a naked [[ribonucleoprotein|ribonucleoprotein complex]] |
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| image2 = Viruses-11-00233-g006b-top.png |
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| taxon = Narnavirus |
| taxon = Narnavirus |
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| type_species = ''[[Saccharomyces 20S RNA narnavirus]]''<ref name=ICTV>{{cite web|last1=ICTV|title=Virus Taxonomy: 2014 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=15 June 2015}}</ref> |
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| subdivision_ranks = Species |
| subdivision_ranks = Species |
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| subdivision = |
| subdivision = {{center| [[#Taxonomy|See text]] }} |
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'''''Narnavirus''''' is a genus of [[ |
'''''Narnavirus''''' is a genus of [[positive-strand RNA virus]]es in the family '''''Narnaviridae'''''. [[Fungus|Fungi]] serve as natural hosts. There are two species in this genus.<ref name=ICTV /><ref name=ViralZone>{{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/303.html|publisher=ExPASy|access-date=15 June 2015}}</ref> Member viruses have been shown to be required for sexual reproduction of ''[[Rhizopus microsporus]]''.<ref>{{cite journal | year = 2020 | title = Narnaviruses: Novel players in fungal–bacterial symbioses |author=Espino-Vázquez AN |author2=Bermúdez-Barrientos JR |author3=Cabrera-Rangel JF |author4=Córdova-López G |author5=Cardoso-Martínez F |author6=Martínez-Vázquez A |author7=Camarena-Pozos DA |author8=Mondo SJ |author9=Pawlowska TE |author10=Abreu-Goodger C |author11=Partida-Martínez LP. | journal = The ISME Journal | volume = 14 | issue = 7 | pages = 1743–1754 | doi = 10.1038/s41396-020-0638-y| pmid = 32269378 | pmc = 7305303 }}</ref> Narnaviruses have a ''na''ked ''RNA'' genome without a virion and derive their name from this feature.<ref>{{Cite web|title=Narnaviridae - Positive Sense RNA Viruses - Positive Sense RNA Viruses (2011) - ICTV|url=https://talk.ictvonline.org/ictv-reports/ictv_9th_report/positive-sense-rna-viruses-2011/w/posrna_viruses/267/narnaviridae|access-date=2021-06-15|website=talk.ictvonline.org}}{{dead link|date=January 2023|bot=medic}}{{cbignore|bot=medic}}</ref> |
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== |
== Virology == |
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===Structure=== |
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| ⚫ | Narnaviruses have nonsegmented, linear, [[Sense (molecular biology)|positive-sense]], single-stranded RNA genomes. The genome has one [[open reading frame]] which encodes the [[RNA-dependent RNA polymerase]] (RdRp). The genome is associated with the RdRp in the [[cytoplasm]] of the fungi host.<ref name="ViralZone" /> |
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== |
=== Genome === |
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| ⚫ | Narnaviruses have nonsegmented, linear, [[Sense (molecular biology)|positive-sense]], single-stranded RNA genomes. The genome has one [[open reading frame]] which encodes the [[RNA-dependent RNA polymerase]] (RdRp). The genome is associated with the RdRp in the [[cytoplasm]] of the fungi host and forms a naked [[ribonucleoprotein]] complex.<ref name="ViralZone" /> |
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===Replication cycle=== |
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Viral replication is cytoplasmic. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement. Fungi serve as the natural host. Transmission routes are parental and sexual.<ref name=ViralZone /> |
Viral replication is cytoplasmic. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement. Fungi serve as the natural host. Transmission routes are parental and sexual.<ref name=ViralZone /> |
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== Taxonomy == |
== Taxonomy == |
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The genus has the following two species:<ref name=ICTV >{{cite web |title=Virus Taxonomy: 2020 Release |url=https://ictv.global/taxonomy |publisher=International Committee on Taxonomy of Viruses (ICTV) |date=March 2021 |access-date=16 May 2021}}</ref> |
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The genus has two species: |
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* Family: ''Narnaviridae'' |
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** Genus: ''Narnavirus'' |
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***''[[Saccharomyces 20S RNA narnavirus]]'' |
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*** ''[[Saccharomyces 23S RNA narnavirus]]'' |
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==References== |
==References== |
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Latest revision as of 22:40, 25 September 2023
| Narnavirus | |
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| Narnaviruses have no capsid or viral envelope, RNA genome and RdRp form a naked ribonucleoprotein complex | |
Virus classification 
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| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Orthornavirae |
| Phylum: | Lenarviricota |
| Class: | Amabiliviricetes |
| Order: | Wolframvirales |
| Family: | Narnaviridae |
| Genus: | Narnavirus |
| Species | |
Narnavirus is a genus of positive-strand RNA viruses in the family Narnaviridae. Fungi serve as natural hosts. There are two species in this genus.[1][2] Member viruses have been shown to be required for sexual reproduction of Rhizopus microsporus.[3] Narnaviruses have a naked RNA genome without a virion and derive their name from this feature.[4]
Virology[edit]
Structure[edit]
Narnaviruses have no true virion. They do not have structural proteins or a capsid.[5]
Genome[edit]
Narnaviruses have nonsegmented, linear, positive-sense, single-stranded RNA genomes. The genome has one open reading frame which encodes the RNA-dependent RNA polymerase (RdRp). The genome is associated with the RdRp in the cytoplasm of the fungi host and forms a naked ribonucleoprotein complex.[2]
Replication cycle[edit]
Viral replication is cytoplasmic. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement. Fungi serve as the natural host. Transmission routes are parental and sexual.[2]
Taxonomy[edit]
The genus has the following two species:[1]
References[edit]
- ^ a b "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 16 May 2021.
- ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.
- ^ Espino-Vázquez AN; Bermúdez-Barrientos JR; Cabrera-Rangel JF; Córdova-López G; Cardoso-Martínez F; Martínez-Vázquez A; Camarena-Pozos DA; Mondo SJ; Pawlowska TE; Abreu-Goodger C; Partida-Martínez LP. (2020). "Narnaviruses: Novel players in fungal–bacterial symbioses". The ISME Journal. 14 (7): 1743–1754. doi:10.1038/s41396-020-0638-y. PMC 7305303. PMID 32269378.
- ^ "Narnaviridae - Positive Sense RNA Viruses - Positive Sense RNA Viruses (2011) - ICTV". talk.ictvonline.org. Retrieved 15 June 2021.[dead link]
- ^ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0-470-01617-6.