Iridovirus

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Iridovirus
Iridovirus virion.jpg
Schematic drawings of Iridovirus virions
Blue roly-poly with virus.jpg
Armadillidium vulgare symptomatic of Invertebrate iridescent virus 31 (above) among individuals with typical colouration (below)
Virus classification OOjs UI icon edit-ltr.svg
(unranked): Virus
Realm: Varidnaviria
Kingdom: Bamfordvirae
Phylum: Nucleocytoviricota
Class: Megaviricetes
Order: Pimascovirales
Family: Iridoviridae
Subfamily: Betairidovirinae
Genus:Iridovirus
Species

See text

Iridovirus is a genus of viruses in the family Iridoviridae . [1] Insects serve as natural hosts. Currently, only two species are placed in this genus. Invertebrate iridescent virus 6 (IIV-6) was recognised as the type species until such a designation was abolished. IIV-6 is hosted by mosquitos and usually causes covert (inapparent) infection that reduces fitness. [1] [2] The remaining species Invertebrate iridescent virus 31 (IIV-31) is hosted by isopods and causes patent (apparent) infection characterised by blue to bluish-purple iridescence and a shortened lifespan.

Contents

Taxonomy

Group: dsDNA

Order: Pimascovirales

[3]

Former species Invertebrate iridescent virus 1 (IIV-1) has been removed from Iridovirus. Its current status is a tentative member of Chloriridovirus . [4]

Structure

Viruses in Iridovirus are enveloped, with icosahedral and polyhedral geometries, and T=147 symmetry. Their diameter is around 185 nm. Genomes are linear, around 213 kb in length. The genome codes for 211 proteins. [1] [2]

GenusStructureSymmetryGenomic arrangementGenomic segmentation
IridovirusPolyhedralT=147LinearMonopartite

Life cycle

Viral replication is nucleocytoplasmic. Entry into the host cell is achieved by attachment of the viral proteins to host receptors, which mediates endocytosis. Replication follows the DNA strand displacement model. DNA-templated transcription is the method of transcription. Invertebrates serve as their natural hosts. [2]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
IridovirusInvertebratesNoneCell receptor endocytosisLysis; buddingNucleusCytoplasmContact

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Megalocytivirus is a genus of viruses in the family Iridoviridae and one of three genera within this family which infect teleost fishes, along with Lymphocystivirus and Ranavirus. Megalocytiviruses are an emerging group of closely related dsDNA viruses which cause systemic infections in a wide variety of wild and cultured fresh and saltwater fishes. Megalocytivirus outbreaks are of considerable economic importance in aquaculture, as epizootics can result in moderate fish loss or mass mortality events of cultured fishes.

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<i>Invertebrate iridescent virus 31</i> Species of virus

Invertebrate iridescent virus 31 (IIV-31), also known informally as isopod iridovirus, is a species of invertebrate iridescent virus in the genus Iridovirus. Oniscidea serve as hosts. Infection is associated with decreased responsiveness in the host, increased mortality, and most strikingly, the emergence of an iridescent blue or bluish-purple colour due to the reflection of light off a paracrystalline arrangement of virions within the tissues.

References

  1. 1 2 3 "Iridoviridae". ICTV Online (10th) Report.
  2. 1 2 3 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. ICTV: Master Species List 2018b.v2, on: ICTVonline: MSL #34 as of February 2019
  4. ICTV: ICTV Taxonomy history: Invertebrate iridescent virus 1 (ZIP)