Tetraparvovirus

Tetraparvovirus
Virus classification
Group: Group II (ssDNA)
Order: Unassigned
Family: Parvoviridae
Subfamily: Parvovirinae
Genus: Tetraparvovirus
Type species
Primate tetraparvovirus 1

Tetraparvovirus are a genus of viruses in the family Parvoviridae. There are currently six recognized species: Chiropteran tetraparvovirus 1, Primate tetraparvovirus 1, Ungulate tetraparvovirus 1, Ungulate tetraparvovirus 2, Ungulate tetraparvovirus 3, and Ungulate tetraparvovirus 4.

History

The first members of this genus were described in 2005.[1] These new viruses were recognised as being related to but distinct from the known parvoviruses. They were isolated from a group of patients who had engaged in high risk behavior. Other members of this group were isolated from animal sources in Hong Kong.[2] These isolates were originally referred to as Hokoviruses. They have been isolated from wild boars in Germany[3] and chimpanzees and baboons.[4] They have also been isolated from sheep[5] and pigs.[6] Finally, they have been also identified in bats.[7]

Description

Tetraparvoviruses are small, non enveloped animal viruses with a single-stranded DNA genome between 4 and 6 kb in length. There are 2 open reading frames (ORF) are present in the genome. ORF1 encodes the non-structural protein (NS1) and ORF2 encodes the viral capsid proteins (VP1/VP2). Inverted terminal repeats are present at the 5′ and 3′ ends of the genome. Within this family there is a third ORF lying within VP1.

The NS1 protein possesses both helicase and ATPase domains. It has ~652 amino acids residues and a molecular weight of 70–75 kiloDaltons (kDa). The VP1 protein contains 900–950 amino acid residues and is ~100 kDa in molecular weight. VP1 has a conserved phospholipase A2 domain which is used by the viron to escape from the endosome.

The third ORF encodes a small protein with a single transmembrane helix spanning 20 amino acid residues in the centre. Its molecular weight is ~10 kDa. The function of this protein is not known.

Virology

These viruses have been isolated from blood, liver, spleen, lymph node and bone marrow.

Clinical

These viruses have not been associated with disease in any of their known hosts to date.

References

  1. ↑ Jones MS, Kapoor A, Lukashov VV, Simmonds P, Hecht F, et al (2005) New DNA viruses identified in patients with acute viral infection syndrome. J Virol 79: 8230–8236.
  2. ↑ Lau SK, Woo PC, Tse H, Fu CT, Au WK, et al (2008) Identification of novel porcine and bovine parvoviruses closely related to human parvovirus 4. J Gen Virol 89: 1840–1848
  3. ↑ Adlhoch C, Kaiser M, Ellerbrok H, Pauli G (2010) High prevalence of porcine Hokovirus in German wild boar populations. Virol J 7: 171
  4. ↑ Sharp CP, LeBreton M, Kantola K, Nana A, Diffo Jle D, et al. (2010) Widespread infection with homologues of human parvoviruses B19, PARV4, and human bocavirus of chimpanzees and gorillas in the wild. J Virol 84: 10289–10296
  5. ↑ Tse H, Tsoi HW, Teng JL, Chen XC, Liu H, Zhou B, Zheng BJ, Woo PC, Lau SK, Yuen KY (2011) Discovery and genomic characterization of a novel ovine partetravirus and a new genotype of bovine partetravirus. PLoS One 6(9):e25619.
  6. ↑ Li B, Ma J, Xiao S, Wen L, Ni Y, Zhang X, Fang L, He KJ (2012) Genome sequence of a highly prevalent porcine partetravirus in mainland China. Virol 86(3):1899
  7. ↑ Canuti, Marta; Eis-Huebinger, Anna Maria; Deijs, Martin; de Vries, Michel; Drexler, Jan Felix; Oppong, Samuel K.; Müller, Marcel A.; Klose, Stefan M.; Wellinghausen, Nele (2011-12-27). "Two Novel Parvoviruses in Frugivorous New and Old World Bats". PLoS ONE. 6 (12): e29140. PMC 3246463 Freely accessible. PMID 22216187. doi:10.1371/journal.pone.0029140.
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