Avihepadnavirus
Avihepadnavirus | |
---|---|
Virus classification | |
(unranked): | Virus |
Realm: | Riboviria |
Kingdom: | Pararnavirae |
Phylum: | Artverviricota |
Class: | Revtraviricetes |
Order: | Blubervirales |
Family: | Hepadnaviridae |
Genus: | Avihepadnavirus |
Species | |
|
Avihepadnavirus is a genus of viruses, in the family Hepadnaviridae.[1] Birds serve as natural hosts. There are three species in this genus.[1] Diseases associated with this genus include: hepatitis, hepatocellular carcinomas (chronic infections), and cirrhosis.[2][3]
Taxonomy
The genus contains the following species:[4]
- Duck hepatitis B virus
- Heron hepatitis B virus
- Parrot hepatitis B virus
Structure
Viruses in the genus Avihepadnavirus are enveloped, with spherical geometries, and T=4 symmetry. The diameter is around 42 nm. Genomes are circular, around 3.2kb in length. The genome codes for 7 proteins.[1][2]
Genus | Structure | Symmetry | Capsid | Genomic arrangement | Genomic segmentation |
---|---|---|---|---|---|
Avihepadnavirus | Icosahedral | T=4 | Non-enveloped | Circular | Monopartite |
Life cycle
Viral replication is nucleo-cytoplasmic. Replication follows the dsDNA(RT) replication model. DNA-templated transcription, specifically dsDNA-RT transcription, with some alternative splicing mechanism is the method of transcription. Translation takes place by
Genus | Host details | Tissue tropism | Entry details | Release details | Replication site | Assembly site | Transmission |
---|---|---|---|---|---|---|---|
Avihepadnavirus | Birds | Hepatocytes | Cell receptor endocytosis | Budding | Nucleus | Cytoplasm | Vertical: parental; sex; blood |
References
- ^ a b c d "ICTV Report Hepadnaviridae".
- ^ a b c "Viral Zone". ExPASy. Retrieved 12 June 2015.
- PMID 15708992.
- ^ "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 21 May 2021.