Search results
Results From The WOW.Com Content Network
A latent infection results when the provirus is transcriptionally silent rather than active. A latent infection may become productive 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 ...
A long terminal repeat (LTR) is a pair of identical sequences of DNA, several hundred base pairs long, which occur in eukaryotic genomes on either end of a series of genes or pseudogenes that form a retrotransposon or an endogenous retrovirus or a retroviral provirus. All retroviral genomes are flanked by LTRs, while there are some ...
Provirus silencing, or proviral silencing, is the repression of expression of proviral genes in cells. A provirus is a viral DNA that has been incorporated into the chromosome of a host cell, often by retroviruses such as HIV. [1] Endogenous retroviruses are always in the provirus state in the host cell and replicate through reverse ...
Diagram displaying the integration of viral DNA into a host genome. Endogenous retroviruses can play an active role in shaping genomes. Most studies in this area have focused on the genomes of humans and higher primates, but other vertebrates, such as mice and sheep, have also been studied in depth.
The main function of IN is to insert the viral DNA into the host chromosomal DNA, an essential step for HIV replication. Integration is a "point of no return" for the cell, which becomes a permanent carrier of the viral genome (provirus). Integration is in part responsible for the persistence of retroviral infections. [10]
The viral DNA is then translocated into the nucleus where one strand of the retroviral genome is put into the chromosomal DNA by the help of the virion integrase. At this point the retrovirus is referred to as provirus. Once in the chromosomal DNA, the provirus is transcribed by the cellular RNA polymerase II.
Lambda phage is a non-contractile tailed phage, meaning during an infection event it cannot 'force' its DNA through a bacterial cell membrane. It must instead use an existing pathway to invade the host cell, having evolved the tip of its tail to interact with a specific pore to allow entry of its DNA to the hosts.
Prior advances in high-throughput sequencing (HTS) revealed insights into their diversity, evolutionary dynamics, and genome integrations. However, due to shallow sequencing in the past, the genetic composition and diversity of tissue-resident viruses remained poorly characterized, hindering understanding of their roles in pathogenesis and ...