THE GENERATION OF CODING SEQUENCES OF CELLULAR GENOME THROUGH COOPTION OF VIRAL GENES
Journal Title: Annals of Mechnikov Institute - Year 2018, Vol 0, Issue 4
Abstract
This review attempts to summarize the available data concerning the influence of viruses on the generation of the cellular genome coding genes content. For a long time endogenous retroviruses have been considered as selfish elements of the organism genome. But now there is growing evidence that endogenous retroviruses are more than genome junk and can serve as source for new coding sequences allowing organism evolution. Many genes derived from retroviruses have been identified in eukaryote through comparative genomics and functional analyses. In particular, genes derived from gag structural protein and envelope (env) genes, as well as from the integrase-coding and protease-coding sequences, have been identified in humans and other vertebrates. It has been proved that a number of these genes fulfill essential functions for the development and survival of their host. One of the best known co-opted retroviral genes encoded syncytin plays a key role in the placenta development. It is interesting that during mammalian evolution retroviral envelope genes have been domesticated several times independently to generate syncytin. The activity-regulated cytoskeletal protein Arc is important for cognitive functions and memory formation. Arc was one of over 100 human proteins that have been ‘‘domesticated’’ from the retrotransposon remains of ancient viruses. A number of genes that code the transcription factors have emerged as a result of “taming” the viral genes by the host organism. Now growing evidence reveals that not only retroviruses but other RNA viruses are reverse-transcribed and integrated into the genome of infected cells. It has been recently demonstrated that all Homo sapiens bornavirus like nucleoproteins (EBLN) are expressed in at least one tissue and consequently may have function.The co-option of the viral sequences not only can lead to the major evolutionary innovations, but also is able to create interspecies polymorphism.What it has been described here is probably only the tip of the iceberg, and future genome analyses will certainly uncover new virus-derived genes.
Authors and Affiliations
N. N. , Popov, N. I. , Sklyar, T. Yu. , Kolotova, M. B. , Davydenko, I. A. Voronkina
Keywords
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- EP ID EP612809
- DOI 10.5281/zenodo.2547443
- Views 187
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