Dependovirus
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The Dependovirus is a member of the Parvoviridae viruses, which are class 2 viruses according to David Baltimore classification of viruses. The Dependovirus is part of the sub family of the Parvoviridae family known as the Parvovirnae.
The Dependoviruses are replication defective viruses. This means that they are unable to repliacte there genome without the presence of a helper virus. The genus consists of 4 types of adeno-associated viruses (AAV1-4) which require Adenovirus (or Herpesvirses ) for helper functions to replicate. The adenovirus is involved in early replication, which means that the virus is involoved in regulatory function of the Dependoviruses. The Adenovirus is not involved in the later stages of replication where the structural genes are involved.
Recent work has shown that treatment of cells with UV, cyclohexmide or some carcinogens can replace the requirement for a helper virus to aid the replication of the Dependovirus.
The Dependoviruses genetic material has been shown to be able to persist in cultured cells for long periods of time. During this time the virus does not show any evidence of its presence. The virus is able to survive within human beings in what is known as a latent state. In this state the virus is only detectable in a specimen taken from a person that is also infected with adenovirus. It is this characteristic that allows the Dependovirus to survive even though the virus is defective in its ability to replicate. The viruses inability to replicate also affects its ability to passed in an infective form from host to host.
[edit] References
- http://www.answers.com/topic/dependovirus
- http://www.microbiologybytes.com/virology/Parvoviruses.html
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