Varicellovirus

Varicellovirus
Virus classification
Group: Group I (dsDNA)
Order: Herpesvirales
Family: Herpesviridae
Subfamily: Alphaherpesvirinae
Genus: Varicellovirus
Type species
Human herpesvirus 3
Species[1]

Bovine alphaherpesvirus 1
Bovine alphaherpesvirus 5
Bubaline alphaherpesvirus 1
Canid alphaherpesvirus 1
Caprine alphaherpesvirus 1
Cercopithecine alphaherpesvirus 9
Cervid alphaherpesvirus 1
Cervid alphaherpesvirus 2
Equid alphaherpesvirus 1
Equid alphaherpesvirus 3
Equid alphaherpesvirus 4
Equid alphaherpesvirus 8
Equid alphaherpesvirus 9
Felid alphaherpesvirus 1
Human alphaherpesvirus 3
Phocid alphaherpesvirus 1
Suid alphaherpesvirus 1

Varicellovirus (var′i-sel′ō-vi′rŭs) is a genus of viruses belonging to subfamily Alphaherpesvirinae, a member of family Herpesviridae. Humans and mammals serve as natural hosts. There are currently 17 species in this genus including the type species Human herpesvirus 3. Diseases associated with this genus include: HHV-3 (also known as Varicella zoster virus) causes chickenpox (varicella) and shingles. BoHV-1 infectious bovine rhinotracheitis / infectious pustular vulvovaginitis (IPV)- SuHV-1 (also known as pseudorabies virus) causes Aujesky's disease characterized by central nervous system signs (hindleg paralysis, meningoencephalitis), high mortality rates in young animals, and respiratory illness in older pigs.[2][3]

Morphology

As with other alphaherpesviruses, the virus particle has a layered structure: Virions consist of an envelope, a tegument, a nucleocapsid, and a core. Tegument is disordered; they do not display a structure and proteins in variable amounts are arranged sometimes in an asymmetric layer located between envelope and capsid. The viral capsid is contained within a spherical envelope which is 120-200 nm in diameter. Surface projections on envelope (viral receptors) are densely dispersed and contain small spikes that evenly dot the surface.

The capsid/nucleocapsid is round with triangulation number T=16 and exhibits icosahedral symmetry. The capsid is isometric and has a diameter of 100–110 nm.[2] The capsid consists of 162 capsomer proteins with a hexagonal base and a hole running halfway down the long axis. The core consists of a fibrillar spool on which the DNA is wrapped. The end of the fibers are anchored to the underside of the capsid shell.[4] It is a double-stranded enveloped DNA virus

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
VaricellovirusSpherical PleomorphicT=16EnvelopedLinearMonopartite

Life Cycle

Viral replication is nuclear, and is lysogenic. Entry into the host cell is achieved by attachment of the viral glycoproteins to host receptors, which mediates endocytosis. Replication follows the dsDNA bidirectional replication model. DNA-templated transcription, with some alternative splicing mechanism is the method of transcription. The virus exits the host cell by nuclear egress, and budding.[2] Humans and mammals serve as the natural host.[2] Only one member of the Varicellovirus genus, Varicella zoster virus (HHV-3) infects Homo sapiens (humans).[5]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
VaricellovirusMammalsEpithelial mucosaGlycoprotiensBuddingNucleusNucleusAerosol

See also

References

  1. ↑ "Virus Taxonomy". International Committee on the Taxonomy of Viruses. Retrieved 25 June 2016.
  2. 1 2 3 4 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. ↑ ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  4. ↑ ICTVdB—The Universal Virus Database, version 4. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/
  5. ↑ Davison, A.J. (2002). Evolution of the herpesviruses. Vet. Microbial., 86, 69–88.
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