ICTV Report

Family: Gammaflexiviridae (Interim Report)

This is a summary page created by the ICTV Report Editors using information from associated Taxonomic Proposals and the Master Species List.

Edited by: Sead Sabanadzovic
Posted: February 2025

Summary

The family Gammaflexiviridae includes RNA(+) viruses of fungi (Table 1 Gammaflexiviridae). The genome is monopartite, 7–9 kb, and encodes RNA dependent RNA polymerase (RdRP) and coat protein. The family Gammaflexiviridae was established in 2009 (Master Species List #25).

Table 1 Gammaflexiviridae. Characteristics of members of the family Gammaflexiviridae.

CharacteristicDescription
ExampleBotrytis virus F (AF238884), species Mycoflexivirus phibotrytidis, genus Mycoflexivirus
VirionNon-enveloped, flexuous and filamentous
GenomeRNA(+), monopartite, capped and polyadenylated
ReplicationCytoplasmic, involves dsRNA
TranslationPutative subgenome-sized mRNA for the expression of the CP-encoding ORF
Host rangeFungi
TaxonomyRealm Riboviria, kingdom Orthornavirae, phylum Kitrinoviricota, class Alsuviricetes, order Tymovirales: three genera and four species

 

Gammaflexiviridae virion
Figure 1 Gammaflexiviridae. Schematic of virus particle. Image from ViralZone under a Creative Commons Attribution 4.0 International License, credit: SwissBioPics.
Gammaflexiviridae genome
Figure 2 Gammaflexiviridae. Genome organisation of Botrytis virus F, a member of the family Gammaflexiviridae. Boxes indicate open reading frames as annotated on GenBank accession AF238884. A black circle indicates the 5′-terminal cap structure; A indicates a 3′-terminal poly(A) region.
Gammaflexiviridae taxomomy
Figure 3 Gammaflexiviridae. Taxonomy of the family Gammaflexiviridae.

Derivation of names

Gammaflexiviridae, Gammaflexivirus: from the Ancient Greek γάμμα (gámma), the third letter of the Greek alphabet, and flexi, together referring to the third family created from the division of the old family Flexiviridae, a group of filamentous and highly flexible viruses; the suffix -viridae for family taxa and -virus for genus taxa

Mycoflexivirus: from the Ancient Greek mukēs (myco), meaning fungus, and flexi, together referring to the virion morphology and hosts of viruses in the genus; the suffix -virus for genus taxa

Xylavirus: from Xylariaceae, the family of fungi that includes Entoleuca sp., host of the first member of this genus; the suffix -virus for genus taxa