Frequent Retroviral Gene Co-option during the Evolution of Vertebrates.

Molecular Biology and Evolution
Jianhua Wang, Guan-Zhu Han

Abstract

Endogenous retroviruses are ubiquitous in the vertebrate genomes. On occasion, hosts recruited retroviral genes to mediate their own biological functions, a process formally known as co-option or exaptation. Much remains unknown about the extent of retroviral gene co-option in vertebrates, although more than ten retroviral gene co-option events have been documented. Here, we use a phylogenomic approach to analyze more than 700 vertebrate genomes to uncover retroviral gene co-option taking place during the evolution of vertebrates. We identify a total of 177 independent retroviral gene co-option events in vertebrates, a majority of which have not been reported previously. Among these retroviral gene co-option events, 93 and 84 involve gag and env genes, respectively. More than 78.0% (138 out of 177) of retroviral gene co-option occurred within mammals. The gag and env co-option events share a generally similar temporal pattern with less frequent retroviral gene co-option identified in the deep branches, suggesting that retroviral gene co-option might have not been maintained for very long time periods. Moreover, we find co-opted retroviral genes are subject to different selection pressure, implying potentially diverse cellular f...Continue Reading

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Citations

Aug 23, 2020·Viruses·Franziska K Geis, Stephen P Goff
Apr 20, 2021·Molecular Biology and Evolution·Jianhua Wang, Guan-Zhu Han

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