Molecular roots of Down syndrome unraveled

What is it about the extra chromosome inherited in Down syndrome -- chromosome 21 -- that alters brain and body development? Researchers have new evidence that points to the protein SNX27. SNX27 is inhibited by a molecule encoded on chromosome 21. The study shows that SNX27 is reduced in human Down syndrome brains. Restoring SNX27 in Down syndrome mice improves cognitive function and behavior.

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