Genus: Parabovirus

Genus: Parabovirus

Distinguishing features

The genus is distinguished on the basis of genetic characters.

Virion

Morphology

No details are available on the morphology of virions.

Nucleic acid

Genome (W.-P. Guo and Y.-Z. Zhang, unpublished) (Wu et al., 2018): up to 8,315 nt (5′-UTR: up to 731 nt; ORF: 7,167–7,491 nt; 3′-UTR: 93–106 nt). The location of the cre has not been identified. 

Genome organization and replication

Genome layout:

VPg+5′-UTRIRES-II-[L-1A-1B-1C-1D/2Apro-2B-2C/3A-3B-3C-3D]-3′-UTR-poly(A)

The deduced polyprotein ranges from 2,389 to 2,4971 aa. The L protein has unknown function. The 2A protein has been proposed to be a chymotrypsin-like protease. 

Biology

No virus has been isolated. Viral RNA was detected in faecal samples of Norway rats (Rattus norvegicus), striped field mice (Apodemus agrarius), Chevrier's field mice (Apodemus chevrieri), grey red-backed voles (Myodes rufocanus), Chinese white-bellied rats (Niviventer confucianus) and the Chinese striped hamster (Cricetulus barabensis) in China. Four types of Parabovirus A are distinguished by means of phylogenetic analysis.

Derivation of names

Parabovirus--: derived from para (Greek παρά, beside, by) and rabovirus (rabo-: from rat-borne).

Species demarcation criteria

Members of a species of genus Parabovirus:

  • share a common genome organization
  • are less than 30% divergent in the polyprotein aa sequence
  • are less than 35% divergent in the P1 aa sequence
  • are less than 30% divergent in the 2C + 3CD aa sequence

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Parabovirus Aparabovirus A1Longwan-Rn37MF352412Complete genomeParV-A1
Parabovirus Aparabovirus A2Longquan-R132MF352414Complete genomeParV-A2
Parabovirus Aparabovirus A3RtNn-PicoV/HuB2015-3KY432935Complete genomeParV-A3
Parabovirus Aparabovirus A4RtMruf-PicoV/JL2014-3KY432932Complete genomeParV-A4
Parabovirus Bparabovirus B1RtCb-PicoV/HeB2014KY432927Complete genomeParV-B1
Parabovirus Cparabovirus C1RtNn-PicoV/HuB2015-1KY432933Complete genomeParV-C1

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