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Virus classification
Group: Group IV ((+)ssRNA)
Order: Unassigned
Family: Narnaviridae

Narnaviridae is a family of positive single stranded RNA viruses. Members of this family have no capsid.[1]


The genome of these viruses is unipartate and between 2.3 and 3.5 kilobases in length. It encodes a single gene—the RNA dependent RNA polymerase. This protein is associated with the genome in the cytoplasm of the host.[2] The viruses do not have a capsid or envelop and do not form any infectious viral particles except lipid vesicles.[3]

They infect fungi (including yeast) and oomycetes.[4] Mitovirues appear to be among the most common fungi viruses.[3]


Two genera have been recognised to date. Mitoviruses infect the mitochondria of fungi while narnaviruses remain within the cytoplasm of the host cell.[3]

Other members of the Mitovirus are OnuMV1c and OnuMV7.

Their closest relatives among RNA viruses are plant-infecting viruses of genus Ourmiavirus, which, however, have a capsid and a number of other proteins. Other close relatives are bacteriophages of the family Leviviridae.[3]


  1. ^ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 0470016175. 
  2. ^ Solorzano A, Rodríguez-Cousiño N, Esteban R, Fujimura T (2000) Persistent yeast single-stranded RNA viruses exist in vivo as genomic RNA. RNA polymerase complexes in 1:1 stoichiometry. J Biol Chem 275(34):26428–35
  3. ^ a b c d Hillman, B. I.; Cai, G. (2013). "The Family Narnaviridae". Mycoviruses. Advances in Virus Research 86. p. 149. doi:10.1016/B978-0-12-394315-6.00006-4. ISBN 9780123943156.  edit
  4. ^ Cai G, Myers K, Fry WE, Hillman BI (2011) A member of the virus family Narnaviridae from the plant pathogenic oomycete Phytophthora infestans. Arch Virol

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