''Barnaviridae'' is a family of non-enveloped,
positive-strand RNA viruses. Cultivated
mushroom
A mushroom or toadstool is the fleshy, spore-bearing Sporocarp (fungi), fruiting body of a fungus, typically produced above ground on soil or another food source. ''Toadstool'' generally refers to a poisonous mushroom.
The standard for the n ...
s serve as natural hosts. The family has one genus, ''Barnavirus'', which contains one species: ''Mushroom bacilliform virus''. Diseases associated with this family includes
La France disease.
Structure
Viruses in ''Barnaviridae'' are non-enveloped, with icosahedral and Bacilliform geometries, and T=1 symmetry. These viruses are about 50 nm long.
Genome
Genomes are linear, around 4kb in length. The genome has 4 open reading frames.
Genomic RNA serves as both the genome and viral messenger RNA. ORF2 is a polyprotein which is possibly auto-cleaved by the ORF2 viral protease. ORF3 encodes the RNA dependent RNA polymerase and may be translated by ribosomal frameshifting as an ORF2-ORF3 polyprotein. The single capsid protein (ORF4) is translated from a subgenomic RNA.
Life cycle
Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell and passing it down. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. The virus is released horizontal via
mycelium
Mycelium (: mycelia) is a root-like structure of a fungus consisting of a mass of branching, thread-like hyphae. Its normal form is that of branched, slender, entangled, anastomosing, hyaline threads. Fungal colonies composed of mycelium are fo ...
and
basidiospores. Cultivated mushroom, ''
Agaricus bisporus'', serves as the natural host.
References
External links
Viralzone: BarnaviridaeICTV
{{Taxonbar, from=Q3772886
Mycology
Virus families
Riboviria