Nature Podcast Ancient viral DNA helps human embryos develop
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Oct 1, 2025 Benjamin Thompson, a science reporter, delves into how ancient viral DNA influences human embryo development. He reveals that around 8% of our genome consists of these retroviral remnants, which act as crucial regulatory elements. Using CRISPR and blastoids, the research shows that silencing certain viral sequences disrupts proper embryo formation. Additionally, they discuss the role of the human-specific LTR5HS element in regulating vital genes, suggesting that this ancient DNA could have shaped human evolution. Exciting insights into the intersection of evolution and genetics!
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Recent Elements Control Ancient Functions
- A human-only LTR5HS amplified production of ZincFinger729, which in turn activates core proliferation and metabolism genes.
- This creates a surprising hierarchy where recent viral DNA and a young gene control ancient cellular functions.
Viral Patterns May Shape Species Traits
- Raquel Fueyo suggests LTR-driven expression could give cells a competitive growth advantage during early embryogenesis.
- Such species-specific retroviral patterns may help shape differences between mammals and humans.
Use Human Models Then Validate Carefully
- To learn human-specific development, researchers must use human-based models rather than rely only on animals.
- Validate blastoid findings in real embryos when ethically and technically possible to confirm relevance.