Provirus

A provirus is a virus genome that has integrated itself into the DNA of a host cell. One kind of virus that can become a provirus is a retrovirus. When a retrovirus invades a cell, the RNA of the retrovirus is transcribed into DNA by reverse transcriptase, then inserted into the host genome by an integrase.

A provirus does not directly make new DNA copies of itself while integrated into a host genome in this way. Instead, it is passively replicated along with the host genome and passed on to the original cell's offspring; all descendants of the infected cell will also bear proviruses in their genomes. Integration can result in a latent infection or a productive infection. In a productive infection, the provirus is transcribed into messenger RNA which direct production of new viruses that can infect new cells. A latent infection results when the provirus is transcriptionally silent rather than active. Eventually, in response to changes in the host's environmental conditions or health, the provirus may be activated and begin transcription of its viral genome. This can result in the destruction of its host cell because the cell's protein synthesis machinery is hijacked to produce more viruses.

Examples in humans include HIV and HTLV.

A provirus not only refers to a retrovirus but is also used to describe other viruses that can integrate into the host chromosome, another example being adeno-associated virus.