Genus: Socyvirus

Genus: Socyvirus

Distinguishing features

The genus Socyvirus includes a single species represented by soybean cyst nematode virus 1 (SbCNV1) (Bekal et al., 2011). Phylogenetic analysis using a conserved region of the RdRP places SbCNV1 in a separate clade to the nyaviruses (Figure 3.Nyamiviridae).


Nucleic acid

Unsegmented, single-stranded, negative-sense RNA genome of 11,359 nucleotides, assembled from a nematode transcriptome (Bekal et al., 2011).


Based on the genome organization, five structural proteins: nucleoprotein (N), phosphoprotein (P), matrix protein (M), glycoprotein (G) and RdRP (L).

Genome organization and replication

The SbCNV1 genome contains five ORFs in anti-genomic sense in the order 3'-N–P–M–G–L-5', whereas nyaviruses genomes contain one additional ORF (IV) between the N and G coding sequences (Figure 2.Nyamiviridae). Transcription initiation motifs upstream of the ORFs are not conserved between SbCNV1 and nyaviruses.


SbCNV1 was isolated from the plant parasitic nematode Heterodera glycines.

Species demarcation criteria

Not applicable

Member species

SpeciesVirus name(s)Exemplar isolateExemplar accession numberExemplar RefSeq numberAvailable sequenceOther isolatesOther isolate accession numbersVirus abbreviationIsolate abbreviation
Soybean cyst nematode socyvirusSoybean cyst nematode virus 1HM849038NC_024702Complete genomeSbCNV-1

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.

Derivation of names

Genus: acronym of soybean cyst nematode virus: Socy and –virus. Species: named after the host.