Abstract
The conversion of neural stem cells into neurons is associated with the remodeling of organelles, but whether and how this is causally linked to fate change is poorly understood. We examined and manipulated mitochondrial dynamics during mouse and human cortical neurogenesis. We reveal that shortly after cortical stem cells have divided, daughter cells destined to self-renew undergo mitochondrial fusion, whereas those that retain high levels of mitochondria fission become neurons. Increased mitochondria fission promotes neuronal fate, whereas induction of mitochondria fusion after mitosis redirects daughter cells toward self-renewal. This occurs during a restricted time window that is doubled in human cells, in line with their increased self-renewal capacity. Our data reveal a postmitotic period of fate plasticity in which mitochondrial dynamics are linked with cell fate.
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