Ichnovirus

Ichnovirus is a genus of viruses, in the family Polydnaviridae. Parasitoid wasps serve as hosts, and these wasps are themselves parasitoids of Lepidoptera. There are 21 species in this genus.[1][2]

Ichnovirus
Virus classification
(unranked): Virus
Realm: incertae sedis
Kingdom: incertae sedis
Phylum: incertae sedis
Class: incertae sedis
Order: incertae sedis
Family: Polydnaviridae
Genus: Ichnovirus

Taxonomy

The genus contains the following 21 species:[2]

  • Campoletis aprilis ichnovirus
  • Campoletis flavicincta ichnovirus
  • Campoletis sonorensis ichnovirus
  • Casinaria arjuna ichnovirus
  • Casinaria forcipata ichnovirus
  • Casinaria infesta ichnovirus
  • Diadegma acronyctae ichnovirus
  • Diadegma interruptum ichnovirus
  • Diadegma terebrans ichnovirus
  • Enytus montanus ichnovirus
  • Eriborus terebrans ichnovirus
  • Glypta fumiferanae ichnovirus
  • Hyposoter annulipes ichnovirus
  • Hyposoter exiguae ichnovirus
  • Hyposoter fugitivus ichnovirus
  • Hyposoter lymantriae ichnovirus
  • Hyposoter pilosulus ichnovirus
  • Hyposoter rivalis ichnovirus
  • Olesicampe benefactor ichnovirus
  • Olesicampe geniculatae ichnovirus
  • Synetaeris tenuifemur ichnovirus

Structure

Viruses in Ichnovirus are enveloped, with prolate ellipsoid and cylindrical geometries. Genomes are circular and segmented, around 6.0-20kb in length.[1]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
IchnovirusProlate ellipsoidEnvelopedCircularSegmented

Life cycle

Viral replication is nuclear. DNA-templated transcription is the method of transcription. The virus exits the host cell by nuclear pore export. Parasitoid wasps in the subfamilies Banchinae and Campopleginae serve as hosts, but these wasps are themselves parasites of lepidoptera. The wasp injects one or more eggs into its host along with a quantity of virus. The virus and wasp are in a symbiotic relationship: expression of viral genes prevents the wasp's host's immune system from killing the wasp's injected egg and causes other physiological alterations that ultimately cause the parasitized host to die. Transmission routes are parental.[1]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
IchnovirusParasitoid wasps (Ichneumonidae)Hemocytes; fat bodiesUnknownLysis; buddingNucleusNucleusUnknown

References
  1. "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 24 May 2021.
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