By G. Devauchelle, D. B. Stoltz, F. Darcy-Tripier (auth.), Dr. Dawn B. Willis (eds.)
In 1976 the overseas Committee on Taxonomy of Vi ruses (ICTV) created the kin Iridoviridae to surround numerous diverse vertebrate and invertebrate viruses that didn't healthy into any of the opposite verified teams. The unifying good points of this new family members have been (1) polyhedral symmetry; (2) huge (approximately one hundred seventy kilobase pairs), lin ear, double-stranded DNA genomes; and (37) a cytoplas mic website of replication. The identify "iridovirus" used to be derived from the observa tion that larvae contaminated with the various insect viruses, in addition to purified pellets of those viruses, glowed with a blue or eco-friendly iridescence - possibly because of the Bragg influence of the viral crystals. notwithstanding, not one of the vertebrate "iridoviruses" displayed this actual attribute. An test was once made to replacement the extra descriptive identify of "icosahedral cytoplasmic deoxyribovirus", yet not just used to be this time period too unwieldy, it additionally didn't agree to the latinized nomenclature the ICTV wanted to undertake. So, for either historic and esthetic purposes, "Iridoviridae" was once followed as a relatives identify, with Iridovirus because the genus represented through the kind 1 iridescent insect virus, Tipula iri descent virus. on the 1982 ICTV assembly, adequate biochem ical information had accrued to allow the institution of the next 5 genera within the family members Iridoviridae: English vernacular overseas kind species identify identify 1. Small iridescent Iridovirus Tipula iridescent virus insect virus (Type 1) 2. huge iridescent Chloriridovirus Mosquito iridescent insect virus virus (Type 2) 3.
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Additional info for Iridoviridae
Virus structural antigens were observed 96 h postinfection, by means of the indirect immunofluorescence technique, in A. aegypti (KELLY and TINSLEY. 1974a). , to be published). In C. fumiferana cells, viral capsid antigens appeared 7-10 h postinfection, and newly synthesized DNA could be detected at 8 h as Feulgen-positive areas in the cytoplasm (CERUTTI et al. 1981). There have been contradictory reports concerning the mode of release of mature virions. In some cases (HUKUHARA and HASlllMOTO 1967; McINTOSH and KIMURA 1974) CIV was released by budding through the cell membrane, however, in other cases (KELLY and TINSLEY 1974a) budding was not observed and CIV was released by cell lysis or by extrusion of vacuoles containing clusters of virus particles.
Recently, DELIUS et al. (1984) showed that the DNA of iridescent virus type 6 (ex Chilo suppressalis) is circularly permuted and terminally redundant. They estimated the size to be 158 million daltons, with the unique sequences amounting to 140 million. Previously, KELLY and AVERY (1974) recognized reiterated sequences in the genome of this virus computed (imprecisely) to be about 15% of the genome, 6 million sequences. 3 Iridescent Virus Relationships Iridovirus and Chloriridovirus appear to be two distinct genera.
M. C. KELLY (unpublished observations) have observed immediate-early and delayedearly protein synthesis prior to viral DNA synthesis, and late synthesis after viral DNA replication - similar to that observed with frog virus 3 (ELLIOTT and KELLY 1980). In reality, there is an area of complete ignorance about the molecular aspects of iridescent virus replication. 5 Ecology of Iridescent Viruses Iridescent viruses appear to be ubiquitous in nature. They have been found on all the major continents of the world and in many insect species.
Iridoviridae by G. Devauchelle, D. B. Stoltz, F. Darcy-Tripier (auth.), Dr. Dawn B. Willis (eds.)