Family: Tonesaviridae (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: Luisa Rubino
Posted: March 2025

Summary

The family Tonesaviridae includes ssRNA(+) satellite viruses of plants (Table 1 Tonesaviridae). The family Tonesaviridae was established in 2025 (Master Species List #40).

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

Characteristic	Description
Example	satellite tobacco necrosis virus 1 (V01468), species Albetovirus alphatabaci
Virion	Capsids with T=1 symmetry (diameter 17 nm), constructed from 60 copies of capsid protein that has jelly-roll topology
Genome	ssRNA(+) of 1.2 kb (Figure 1 Tonesaviridae)
Replication	Satellite virus dependent on members of the genera Alphanecrovirus or Betanecrovirus (family Tombusviridae). Involves helper virus replicase and tonesavirus (+) strand and (-) strand transcripts.
Translation	Cap-independent translation initiation involving a conserved 3′-terminal stem-loop structure
Host range	Plants
Taxonomy	Realm Riboviria: 2 genera, 4 species (Figure 2 Tonesaviridae)

Figure 1 Tonesaviridae. Genome organisation of satellite tobacco necrosis virus 1, a member of the family Tonesaviridae. Boxes indicate open reading frames as annotated on GenBank accession V01468.

Figure 2 Tonesaviridae. Taxonomy of the family Tomosaviridae.

Derivation of names

Albetovirus: from Alphanecrovirus (helper virus), Betanecrovirus (helper virus) and tobacco

Tonesaviridae: from tobacco necrosis virus and satellite