Dicistroviridae
Family of viruses
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Taxonomy
Although many dicistroviruses were initially placed in the Picornaviridae, they have since been reclassified into their own family. The name (Dicistro) is derived from the characteristic dicistronic arrangement of the genome.
This family is a member of the Order Picornavirales (along with the families Iflaviridae, Picornaviridae, and Secoviridae and Marnaviridae). Within this order, the gene order is the gene order of the nonstructural proteins Hel(helicase)-Pro(protease)-RdRp(polymerase). The Dicistroviridae can be distinguished from the members of the taxa by the location of their structural protein genes at the 3' end rather than the 5' end (as found in Iflavirus, Picornaviridae and Secoviridae) and by having two genomic segments rather than a single one (as in the Comovirus).
The family contains the following genera and species:
Genus: Aparavirus
- Aparavirus apisacutum, Acute bee paralysis virus
- Aparavirus cancerluti, Mud crab virus
- Aparavirus israelense, Israeli acute paralysis virus
- Aparavirus kashmirense, Kashmir bee virus
- Aparavirus tauraense, Taura syndrome virus
- Aparavirus vallesi, Solenopsis invicta virus 1
Genus: Cripavirus
- Cripavirus drosophilae, Drosophila C virus
- Cripavirus grylli, Cricket paralysis virus
- Cripavirus mortiferum, Aphid lethal paralysis virus
- Cripavirus porteri, Solenopsis invicta virus 6
- Cripavirus ropadi, Rhopalosiphum padi virus
Genus: Triatovirus
- Triatovirus himetobi, Himetobi P virus
- Triatovirus hocoagulatae, Homalodisca coagulata virus-1
- Triatovirus nigereginacellulae, Black queen cell virus
- Triatovirus plastali, Plautia stali intestine virus
- Triatovirus triatomae, Triatoma virus
Linepithema humile virus 1 is possibly a member of Dicistroviridae, of unclear placement.
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Structure
Viruses in Dicistroviridae are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 30 nm. Genomes are linear and non-segmented, around 8.5-10.2kb in length. The genome has 2 open reading frames.
Life cycle
Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Translation takes place by viral initiation, and ribosomal skipping. Invertebrates serve as the natural host. Transmission routes are contamination.
RNA structural elements
Many of the Dicistroviridae genomes contains structured RNA elements. For example, the Cripaviruses have an internal ribosome entry site, which mimics a Met-tRNA and is used in the initiation of translation.