Genus: Cheravirus


Genus: Cheravirus

Distinguishing features

Cheraviruses have three CPs of similar sizes. In some cases, these proteins are not fully or reproducibly resolved from each other by electrophoresis. The genome of cheraviruses is bipartite and the genomic organization is similar to that of comoviruses, although RNA-2 is thought to encode a single polyprotein (Figure 3.Secoviridae). The RNA-2-encoded movement protein of apple latent spherical virus (ALSV) is 42 kDa, suggesting that translation initiation occurs at the second AUG, which is in a better context. Tubular structures containing virus-like particles are observed in infected cells and are likely involved in cell-to-cell movement of the virus. The movement protein and all three CPs are necessary for cell-to-cell movement of the virus (Yoshikawa et al., 2006). The MP binds to VP25, one of the three CPs (Isogai et al., 2006). VP20 of ALSV, another CP, is a suppressor of silencing that interferes with systemic movement of the silencing signal (Yaegashi et al., 2007).

The host range is broad or narrow, depending on the virus, and includes weed plants found in the vicinity of infected crops. Symptoms are usually mild or absent. Cherry rasp leaf virus is transmitted by nematodes (Xiphinema americanum) in the field (Nyland et al., 1969), and is readily seed-transmitted (Hansen et al., 1974). ALSV is also seed-transmitted through both embryo and pollen in apple (Nakamura et al., 2011). In potato, Arracacha virus B is transmitted through true seed and pollen (Jones 1982). Currant latent virus  has been detected in oligophagous viviparous females and in nymphs of red blister aphid Cryptomyzus ribis and circulates in the aphid (Petrzik et al., 2015).

Virion

See discussion under family description.

Genome organization and replication

See discussion under family description.

Biology

See discussion under family description.

Species demarcation criteria

See discussion under family description.

Member Species

SpeciesVirus name(s)Exemplar isolateExemplar accession numberExemplar RefSeq numberAvailable sequenceOther isolatesOther isolate accession numbersVirus Abbreviation(s)Isolate Abbreviation
Apple latent spherical virusapple latent spherical virusYoshikawaRNA-1: AB030940; RNA-2: AB030941RNA-1: NC_003787; RNA-2: NC_003788Complete genomeALSV
Arracacha virus BArracacha virus BAVB/PeruRNA-1: JQ437415; RNA-2: JQ581051RNA-1: NC_020898; RNA-2: NC_020897Complete genomeAVB
Cherry rasp leaf viruscherry rasp leaf virusUSARNA-1: AJ621357; RNA-2: AJ621358RNA-1: NC_006271; RNA-2: NC_006272Complete genomeCRLV
Currant latent viruscurrant latent virusHol9/6RNA-1: KT692952; RNA-2: KT692953RNA-1: NC_029038; RNA-2: NC_029036Complete genomeCuLV
Stocky prune virusstocky prune virusBrugeresRNA-1: DQ143874; RNA-2: DQ143875Partial genomeStPV

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.
Download GenBank/EMBL query for sequences listed in the table here.