A Copying Mistake Responsible for Human Brains

A new study suggests that a copying error may be responsible for how human brains have developed over the past 3.5 million years and why we are so different from our closest relatives, the primates. When scientists duplicated this error in mice, the mice’s brain cells were able to move into place faster and establish many more connections (similar to humans). Apparently the specific copy error was a duplication and several of these duplications led the development of the tightly woven, highly connected human brain. 

We may have been looking at the wrong types of mutations to explain human and great ape differences, and these episodic and large duplication events could have allowed for radical — potentially Earth-shattering — changes in brain development and brain function”


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