Tymoviridae

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Turnip yellow mosaic virus on cabbage

Tymoviridae is a family of single-stranded positive sense RNA viruses in the order Tymovirales. Plants serve as natural hosts. The feamily has three genera.<ref name= ViralZone>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=ICTV>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

TaxonomyEdit

The family includes the following three genera:<ref name=ICTV />

Proposed virusesEdit

Culex tymovirus<ref name=Wang2012>Wang L, Lv X, Zhai Y, Fu S, Wang D, Rayner S, Tang Q, Liang G (2012) Genomic characterization of a novel virus of the family tymoviridae isolated from mosquitoes. PLoS One 7(7):e39845.</ref>
Fig fleck-associated virus

VirologyEdit

The virions are non-enveloped and isometric with a diameter of around 30 nm, with an icosahedral structure and a triangulation number T=3.<ref name=ViralZone />

The linear genome is between of 6–7.5 kilobases in length<ref name=ViralZone /> and encodes one large open reading frame. It is capped at the 5’ terminus. The 3’ terminus may have a tRNA-like structure or a polyA tract, depending upon the species. The genome is relatively cytosine rich.Template:Cn

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Maculavirus	Icosahedral	T=3	Non-enveloped	Linear	Monopartite
Marafivirus	Icosahedral	T=3	Non-enveloped	Linear	Monopartite
Tymovirus	Icosahedral	T=3	Non-enveloped	Linear	Monopartite

Life cycleEdit

Viral replication is cytoplasmic, and is lysogenic. 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 leaky scanning. The virus exits the host cell by monopartite non-tubule guided viral movement. Plants serve as the natural host. The virus is transmitted via a vector (insects). Transmission routes are vector and mechanical.<ref name=ViralZone />

Genus	Host details	Tissue tropism	Entry details	Release details	Replication site	Assembly site	Transmission
Maculavirus	Plants	None	Viral movement; mechanical inoculation	Viral movement	Cytoplasm	Cytoplasm	Mechanical inoculation: pseudococcid mealybugs; Mechanical inoculation: aphids
Marafivirus	Plants	None	Viral movement; mechanical inoculation	Viral movement	Cytoplasm	Cytoplasm	Mechanical inoculation: pseudococcid mealybugs; Mechanical inoculation: aphids
Tymovirus	Plants	None	Viral movement; mechanical inoculation	Viral movement	Cytoplasm	Cytoplasm	Mechanical: beetles; sap

ReferencesEdit

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External linksEdit

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