Ancient Viral DNA Regulates Primate Brain Differences
Researchers discover how ancestral viral remnants drive gene expression differences between humans and chimpanzees.
Updated on Oct. 23, 2026 in Life Sciences
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Scientists have identified a viral DNA sequence that accounts for key differences in gene expression between human and chimpanzee brains. This genetic material, which originated from an ancient infection, appears to influence how neural development genes are regulated.
Why it matters
Understanding these viral remnants provides new insight into the evolutionary divergence that resulted in significant structural differences between human and chimpanzee brains. This discovery highlights the unexpected role that ancient viral infections played in shaping the development of modern primate biology.
Researchers utilized CRISPR technology to remove viral DNA from chimpanzee stem cells and deactivate the LINC00662 gene in human cells. This analysis revealed that the 158 viral DNA sites found in chimpanzees help silence LINC00662, a gene that remains active in human brains.
The players
Lund University
This Swedish institution hosted the research team responsible for investigating the link between viral DNA and primate evolutionary divergence.
Science Advances
This peer-reviewed journal published the findings regarding how viral remnants influence gene regulation in humans and chimpanzees.
The details
The study indicates that an ancestral viral infection occurred between 5 million and 7 million years ago in an ancestral African ape. By silencing LINC00662 in chimpanzees, these viral remnants appear to limit activity in genes responsible for neuron development and the formation of neural connections.
Timeline
5 million to 7 million years ago: An ancient viral infection occurred in an ancestral African ape.
October 23, 2026: Study results were published in Science Advances.
The Big Picture
This study extends the human and chimpanzee genome sequencing project by identifying specific functional differences within the 8 percent of the genome previously categorized as viral remnants. It demonstrates that non-coding regions containing viral sequences are critical for understanding how distinct species traits emerge.
This discovery provides a blueprint for scientists to examine other areas of the genome to understand how ancient infections influenced human health and complex neural development. It may lead to new models for studying neurological conditions by highlighting the importance of previously overlooked non-coding DNA.
The takeaway
The study underscores that human evolutionary history is deeply linked to prehistoric viral encounters that left permanent marks on our DNA. Readers should note that what was once considered junk DNA is increasingly recognized as a vital regulator of complex human biological traits.
Further reading
Learn more about the latest breakthroughs in human evolution at Life Sciences.
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