A natural laboratory to elucidate the evolution of endogenous-exogenous retroviral interactions.
2021
The advent of whole genome sequencing has revealed much about the genomes of animals including the relatively large percentage of the genome consisting of endogenous retroviruses (ERV) (Consortium 2001). An ERV arises when a retrovirus integrates into a host germ cell genome through normal infection processes. Germline infections can be transmitted to offspring through Mendelian inheritance and at times become fixed elements of the host genome (Weiss 2006). At their inception, these endogenized retroviruses maintain all the functions of their exogenous progenitors and can produce infectious virus (Figure 1).
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