09/30/2026
Every brain cell has a family tree. Newly published findings on how one cell becomes many will support research on forebrain development and its disorders.
Researchers at the Allen Institute and UCSF have built the first comprehensive lineage atlas of the newborn mouse forebrain, published today in Nature. By tagging stem cells with unique genetic barcodes at eight points during development, the team traced more than 416,000 cells back to nearly 300,000 distinct lineages across five brain regions, revealing what each cell became, when it was born, and where it ended up.
Some cells are "born together, stay together,” and settle near their birthplace. Other cells are "born together, reared apart,” and migrate widely across the brain. The farthest-traveling neurons are significantly enriched for genes linked to autism and other neurodevelopmental conditions, suggesting these disorders may stem less from one faulty region and more from disruptions to the migration programs that wire circuits across the whole brain. It changes where researchers should look, and potentially where therapies should aim.
