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 region of L places SbCNV1 in a separate clade to the nyaviruses.


Nucleic acid

Non-segmented, 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 large protein (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. Transcription initiation motifs upstream of the ORFs are not conserved between SbCNV1 and nyaviruses.


SbCNV1 was isolated from a plant parasitic nematode (Heterodera glycines Ichinohe, 1952).

Derivation of names

Socyvirus: from soybean cyst nematode virus and virus. Species: named after the host.

Species demarcation criteria

Not applicable

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
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.