Secoviridae

''Secoviridae'' is a family of viruses in the order '' Picornavirales''. Plants serve as natural hosts. There are 8 genera and 86 species in this family, one of which is unassigned to a genus. The family was created in 2009 with the grouping of families ''Sequiviridae'', now dissolved, and ''Comoviridae'', now subfamily ''Comovirinae'', along with the then unassigned genera ''Cheravirus'', ''Sadwavirus'', and ''Torradovirus''.

Taxonomy

The family includes the following genera (-''virinae'' denotes subfamily and -''virus'' denotes genus):
* '' Comovirinae''
** '' Comovirus''
** '' Fabavirus''
** '' Nepovirus''
* Unassigned to a subfamily:
** '' Cheravirus''
** '' Sadwavirus''
** '' Sequivirus''
** '' Torradovirus''
** '' Waikavirus''

Lastly, one species is unassigned to a genus: ''Strawberry latent ringspot virus''.

Structure

Viruses in ''Secoviridae'' are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 25-30 nm. Genomes are linear and segmented, bipartite, around 24-7kb in length.

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. 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 tubule-guided viral movement.
Plants serve as the natural host. Transmission routes are mechanical.

Evolution

The subfamily ''Comovirinae'' evolved ~1,000 years ago with extant species diversifying between 50 and 250 years ago. This time period coincides with the intensification of agricultural practices in industrial societies.

The mutation rate has been estimated to be 9.29×10⁻³ to 2.74×10⁻³ subs/site/year.

References

External links

ICTV Online (10th) Report: ''Secoviridae''


* UniProt Taxonom

{{Taxonbar, from=Q3477217

Secoviridae,
Virus families
Picornavirales