Abstract
The basic helix-loop-helix factors Hes1 and Hes5 repress the expression of proneural factors such as Ascl1, thereby inhibiting neuronal differentiation and maintaining neural progenitor cells (NPCs). Hes1 expression oscillates by negative feedback with a period of about 2–3 h in proliferating NPCs. Induction of sustained expression of Hes1 in NPCs inhibits their cell-cycle progression, suggesting that the oscillatory expression of Hes1 is important for the proliferation of NPCs. Hes1 oscillation drives the oscillatory expression of proneural factors such as Ascl1 by periodic repression. By contrast, in differentiating neurons, Hes1 expression disappears and the expression of proneural factors is up-regulated and sustained. A new optogenetics approach that induces Ascl1 expression by blue light illumination demonstrated that sustained expression of Ascl1 induces neuronal differentiation, whereas oscillatory expression of Ascl1 activates the proliferation of NPCs. These results together indicate that Hes1 regulates the oscillatory versus sustained expression of the proneural factor Ascl1, which in turn regulates the proliferation of NPCs and the subsequent processes of cell-cycle exit and neuronal fate determination, depending on the expression dynamics.
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Kageyama, R., Shimojo, H. & Imayoshi, I. Dynamic expression and roles of Hes factors in neural development. Cell Tissue Res 359, 125–133 (2015). https://doi.org/10.1007/s00441-014-1888-7
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DOI: https://doi.org/10.1007/s00441-014-1888-7