Narnavirus: Difference between revisions

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{{Short description|Genus of viruses}}
{{taxobox
{{Use dmy dates|date=April 2017}}
| virus_group = iv
{{virusbox
| familia = ''[[Narnaviridae]]''
| image = Narnaviridae virion.jpg<!--RdRp_and_RNA_genome.png-->
| genus = '''''Narnavirus'''''
| image2_caption = Narnaviruses have no [[capsid]] or [[viral envelope]], [[RNA]] genome and [[RNA-dependent RNA polymerase|RdRp]] form a naked [[ribonucleoprotein|ribonucleoprotein complex]]
⚫
| subdivision_ranks = Type Species
| image2 = Viruses-11-00233-g006b-top.png
| subdivision =
| taxon = Narnavirus
⚫
*''[[Saccharomyces 20S RNA narnavirus]]''
⚫
| subdivision_ranks = Species
| subdivision = {{center| [[#Taxonomy|See text]] }}
}}
}}


'''''Narnavirus''''' is a genus of [[viruses]], in the family [[Narnaviridae]]. Fungi serve as natural hosts. There are currently only two species in this genus including the type species [[Saccharomyces 20S RNA narnavirus]].<ref name=ViralZone>{{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/303.html|publisher=ExPASy|accessdate=15 June 2015}}</ref><ref name=ICTV>{{cite web|last1=ICTV|title=Virus Taxonomy: 2014 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=15 June 2015}}</ref>
'''''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>


==Taxonomy==
== Virology ==
<big>'''Group: ssRNA(+)'''</big>
{{Collapsible list|title= <big>Order: Unassigned</big>
|1={{Collapsible list| framestyle=border:none; padding:1.0em;|title=Family: [[Narnaviridae]]
|1={{hidden begin|title=<small>Genus: Narnavirus</small>}}
⚫
*<small>'''''[[Saccharomyces 20S RNA narnavirus]]'''''</small>
*<small>[[Saccharomyces 23S RNA narnavirus]]</small>
{{hidden end}}
}}
}}<ref name=ICTV />


==Structure==
===Structure===
Narnaviruses have no true virion. They do not have structural proteins or a [[capsid]].<ref name="nocapsid">{{Cite book|last1=Dolja|first1=V. V.|title=ELS|last2=Koonin|first2=E. V.|year=2012|isbn=978-0-470-01617-6|chapter=Capsid-Less RNA Viruses|doi=10.1002/9780470015902.a0023269}}</ref>
Genomes are linear and non-segmented.<ref name=ViralZone />


=== Genome ===
{| class="wikitable sortable" style="text-align:center"
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" />
|-
! Genus !! Structure || Symmetry !! Capsid !! Genomic Arrangement !! Genomic Segmentation
|-
|Narnavirus||No structural proteins||||Non-Enveloped||Linear||Monopartite
|}


==Life Cycle==
===Replication cycle===
Viral replication is cytoplasmic. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement.
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 />
Fungi serve as the natural host. Transmission routes are parental and sexual.<ref name=ViralZone />


== Taxonomy ==
{| class="wikitable sortable" style="text-align:center"

|-
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>
! Genus !! Host Details !! Tissue Tropism !! Entry Details !! Release Details !! Replication Site !! Assembly Site !! Transmission
⚫
* ''[[Saccharomyces 20S RNA narnavirus]]''
|-
⚫
* ''[[Saccharomyces 23S RNA narnavirus]]''
|Narnavirus||Fungi||None||Horizontal; vertical||None||Cytoplasm||Cytoplasm||Horizontal: mating; vertical: parental
|}


==References==
==References==
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* [http://ictvonline.org/virusTaxonomy.asp '''ICTV''']
* [http://ictvonline.org/virusTaxonomy.asp '''ICTV''']
{{Baltimore classification}}
{{Baltimore classification}}

{{Taxonbar|from=Q18819842}}


[[Category:Narnaviridae]]
[[Category:Narnaviridae]]
[[Category:RNA viruses]]
[[Category:Virus genera]]
[[Category:Mycoviruses]]

Latest revision as of 22:40, 25 September 2023

Narnavirus
Narnaviruses have no capsid or viral envelope, RNA genome and RdRp form a naked ribonucleoprotein complex
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Lenarviricota
Class: Amabiliviricetes
Order: Wolframvirales
Family: Narnaviridae
Genus: Narnavirus
Species
See text

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]

  1. ^ a b "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 16 May 2021.
  2. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. ^ 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.
  4. ^ "Narnaviridae - Positive Sense RNA Viruses - Positive Sense RNA Viruses (2011) - ICTV". talk.ictvonline.org. Retrieved 15 June 2021.[dead link]
  5. ^ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0-470-01617-6.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Narnavirus&oldid=1177092937"