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An Ancient Virus Explains Why the Human Brain Is Special

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Briefings

A new study reveals retroviral insertions in chimpanzee genomes shaped the divergence of human and chimp brains, while another study shows crows make ultrafast decisions in 235 milliseconds. The research highlights evolutionary mechanisms behind primate brain complexity and avian decision-making efficiency, though specific immune resistance mechanisms remain partially unexplained.

Key points

• PTERV1 retroviral insertions in chimpanzee chromosome 19 silence LINC00662, a gene active in human brain development that influences neuronal maturation.
• Human and chimpanzee lineages likely avoided a common ancestral pandemic due to germline-competent immune resistance, allowing human brain evolution.

Context

This research addresses the evolutionary divergence between human and chimpanzee brains, with findings published in Science Advances. The study uses organoids to model brain development, revealing how retroviruses influenced primate speciation.

Limitations

The study relies on organoid models rather than human clinical data, and the specific immune resistance mechanism against the ancestral pandemic remains partially unexplained.

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