Topocuvirus

Topocuvirus is a genus of viruses, in the family Geminiviridae. Dicotyledonous plants serve as natural hosts. There is only one species in this genus: Tomato pseudo-curly top virus (Topocuvirus solani). Diseases associated with this genus include: vein swelling, curling of the leaves and leaf distortion.^[1][2][3]

Topocuvirus
Virus classification
(unranked):	Virus
Realm:	Monodnaviria
Kingdom:	Shotokuvirae
Phylum:	Cressdnaviricota
Class:	Repensiviricetes
Order:	Geplafuvirales
Family:	Geminiviridae
Genus:	Topocuvirus

Structure

Viruses in Topocuvirus are non-enveloped, with icosahedral geometries, and T=1 symmetry. The diameter is around 22 nm, with a length of 38 nm. Genomes are circular and non-segmented, around 2.86kb in length.^[1]

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Topocuvirus	Twinned Icosahedral	Incomplete T=1	Non-enveloped	Circular	Monopartite

Life cycle

Viral replication is nuclear. Entry into the host cell is achieved by penetration into the host cell. Replication follows the ssDNA rolling circle model. DNA-templated transcription is the method of transcription. The virus exits the host cell by nuclear pore export, and tubule-guided viral movement. Dicotyledonous plants serve as the natural host. The virus is transmitted via a vector (treehopper). Transmission routes are vector.^[1]

Genus	Host details	Tissue tropism	Entry details	Release details	Replication site	Assembly site	Transmission
Topocuvirus	Dicotyledonous plants	None	Cell receptor endocytosis	Budding	Nucleus	Nucleus	Leafhopper