Narnavirus

Narnavirus is a genus of positive-strand RNA viruses, in the family Narnaviridae. Fungi serve as natural hosts. There are currently two species in this genus including the type species Saccharomyces 20S RNA narnavirus.[1][2] Narnaviruses have been shown to be required for sexual reproduction of Rhizopus microsporus.[3]

Narnavirus
Narnaviruses have no capsid or viral envelope, RNA genome and RdRp form a naked ribonucleoprotein complex
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Lenarviricota
Class: Amabiliviricetes
Order: Wolframvirales
Family: Narnaviridae
Genus: Narnavirus
Type species
Saccharomyces 20S RNA narnavirus[1]
Species
  • Saccharomyces 20S RNA narnavirus
  • Saccharomyces 23S RNA narnavirus

Structure

Narnaviruses have no true virion. They do not have structural proteins or a capsid.[4]

Genome

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]

Life cycle

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

The genus has two species:

  • Narnaviridae
    • Narnavirus
      • Saccharomyces 20S RNA narnavirus
      • Saccharomyces 23S RNA narnavirus

References
  1. ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  2. "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. doi:10.1038/s41396-020-0638-y.CS1 maint: uses authors parameter (link)
  4. Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0470016176.
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