''Carmotetraviridae'' is a family of
positive-strand RNA virus
Positive-strand RNA viruses (+ssRNA viruses) are a group of related viruses that have positive-sense, single-stranded genomes made of ribonucleic acid. The positive-sense genome can act as messenger RNA (mRNA) and can be directly translated int ...
es. There is only one genus in this family, ''Alphacarmotetravirus'', which has one species: ''Providence virus''.
Lepidopteran insects serve as natural hosts.
Structure
Viruses in ''Carmotetraviridae'' are
non-enveloped, with
icosahedral
In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes and . The plural can be either "icosahedra" () or "icosahedrons".
There are infinitely many non- similar shapes of icosahedra, some of them being more symmetrica ...
geometries, and
T = 4 symmetry. The virion diameter is around 40 nm.
Genome
Genomes are linear, around 6.1kb in length. The genome codes for two proteins, and has three
open reading frame
In molecular biology, open reading frames (ORFs) are defined as spans of DNA sequence between the start and stop codons. Usually, this is considered within a studied region of a prokaryotic DNA sequence, where only one of the six possible readin ...
s.
Life cycle
Viral replication is
cytoplasm
In cell biology, the cytoplasm is all of the material within a eukaryotic cell, enclosed by the cell membrane, except for the cell nucleus. The material inside the nucleus and contained within the nuclear membrane is termed the nucleoplasm. ...
ic. 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 suppression of termination. Lepidopteran insects serve as the natural
host. Transmission routes are oral and tissue tropism is the midgut.
[
]
References
External links
Viralzone: Carmotetraviridae
ICTV
{{Taxonbar, from=Q18810741
Virus families
Riboviria