- Research Article
- 10.1101/2025.04.30.651506
Epigenetic motifs distinguishing endogenous from exogenous retroviral integrants.
- Aug 14, 2025
- bioRxiv : the preprint server for biology
- Sarah Lamere + 4 more +4
Expression of vertebrate genes is regulated by chemical modifications made directly to the DNA or to the proteins associated with it, termed epigenetics. Because retroviruses integrate into DNA, they are subject to the same epigenetic modifications as regular genes.Retroviruses will tend to endogenize, meaning they will become a permanent part of a species' genome when their hidden DNA is passed down to progeny during reproduction. However, sometimes it is difficult to discern whether a retroviral sequence is endogenous (permanently fixed) or exogenous (an infectious entity). We hypothesized that changes to the retroviral sequences over time after endogenization would result from epigenetic modifications, and that these changes could help distinguish an endogenous retrovirus from an exogenous one. In this paper, we show that changes to the viral sequences associated with epigenetics indeed take place after endogenization.
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