Alphaflexiviridae

Alphaflexiviridae is a family of viruses in the order Tymovirales.[1] Plants and fungi serve as natural hosts. There are currently 56 species in this family, divided among seven genera.[2] Diseases associated with this family include: mosaic and ringspot symptoms.[2][3]

Alphaflexiviridae
Electron micrograph of narcissus mosaic virus (NMV) filamentous virions
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Kitrinoviricota
Class: Alsuviricetes
Order: Tymovirales
Family: Alphaflexiviridae

Taxonomy

Recognized genera include:

Structure

Viruses in the genus Alphaflexiviridae are non-enveloped, with flexuous and Filamentous geometries. The diameter is around 12-13 nm. Genomes are linear, around 5.4-9kb in length. The genome codes for 1 to 6 proteins.[2][3]

Life cycle

Viral replication is cytoplasmic, and is lysogenic. 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. Translation takes place by leaky scanning. The virus exits the host cell by tripartite non-tubule guided viral movement. Plants and fungi serve as the natural host. The virus is transmitted via a vector (insects). Transmission routes are vector and mechanical.[2][3]

References
  1. Kreuze, JF; Vaira, AM; Menzel, W; Candresse, T; Zavriev, SK; Hammond, J; Hyun Ryu, K; ICTV Report Consortium (July 2020). "ICTV Virus Taxonomy Profile: Alphaflexiviridae". The Journal of General Virology. 101 (7): 699–700. doi:10.1099/jgv.0.001436. PMID 32525472.
  2. "ICTV Report Alphaflexiviridae".
  3. "Viral Zone". ExPASy. Retrieved 12 June 2015.

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