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Wojcinski, Alexandre; Lawton, Andrew K; Bayin, N Sumru; Lao, Zhimin; Stephen, Daniel N; Joyner, Alexandra L
Nature neuroscience, 10/2017, Letnik: 20, Številka: 10Journal Article
Regeneration of several organs involves adaptive reprogramming of progenitors, but the intrinsic capacity of the developing brain to replenish lost cells remains largely unknown. Here we found that the developing cerebellum has unappreciated progenitor plasticity, since it undergoes near full growth and functional recovery following acute depletion of granule cells, the most plentiful neuron population in the brain. We demonstrate that following postnatal ablation of granule cell progenitors, Nestin-expressing progenitors, specified during mid-embryogenesis to produce astroglia and interneurons, switch their fate and generate granule neurons in mice. Moreover, Hedgehog signaling in two Nestin-expressing progenitor populations is crucial not only for the compensatory replenishment of granule neurons but also for scaling interneuron and astrocyte numbers. Thus, we provide insights into the mechanisms underlying robustness of circuit formation in the cerebellum and speculate that adaptive reprogramming of progenitors in other brain regions plays a greater role than appreciated in developmental regeneration.
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