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During development, neural stem cells (NSCs) undergo transitions from neuroepithelial cells to radial glial cells (RGCs), and later, a subpopulation of slowly dividing RGCs gives rise to the quiescent adult NSCs that populate the ventricular-subventricular zone (V-SVZ). Here we show that VCAM1, a transmembrane protein previously found in quiescent adult NSCs, is expressed by a subpopulation of embryonic RGCs, in a temporal and region-specific manner. Loss of VCAM1 reduced the number of active embryonic RGCs by stimulating their premature neuronal differentiation while preventing quiescence in the slowly dividing RGCs. This in turn diminished the embryonic origin of postnatal NSCs, resulting in loss of adult NSCs and defective V-SVZ regeneration. VCAM1 affects the NSC fate by signaling through its intracellular domain to regulate β-catenin signaling in a context-dependent manner. Our findings provide new insight on how stem cells in the embryo are preserved to meet the need for growth and regeneration.
Pubmed ID: 28728023 RIS Download
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