Ancient Gene Unlocks Brain Folding Mystery

A groundbreaking study by scientists at the Kunming Institute of Zoology has revealed the pivotal role of an ancient gene in shaping the human brain. The research, published in Nature Genetics, challenges the idea that only newly evolved genes drove primate brain expansion. Instead, this study highlights how the ancient gene CCNB1IP1, present even in early primate relatives, underwent increased expression over evolutionary time.

This stepwise increase in CCNB1IP1 expression closely mirrors the development of cortical folding, from smooth brains in tree shrews to the highly folded human brain. Researchers identified a specific regulatory sequence, CRE1, responsible for this elevated expression. In a significant experiment, mice engineered to express higher levels of CCNB1IP1 developed folded cerebral cortices and showed improved cognitive functions.

The findings offer a fresh perspective on human brain evolution and provide potential avenues for understanding neural development disorders. This research underscores the significance of conserved genes in complex biological advancements.