Developmental Cell
Volume 35, Issue 5, 7 December 2015, Pages 553-567
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Article
A Dynamic Unfolded Protein Response Contributes to the Control of Cortical Neurogenesis

https://doi.org/10.1016/j.devcel.2015.11.005Get rights and content
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Highlights

  • The UPR is a homeostat regulating the specification of cortical stem cells

  • Elp3 loss in cortical stem cells triggers UPR by decreasing codon translation rates

  • Gradual UPR suppression promotes the switch from direct to indirect neurogenesis

Summary

The cerebral cortex contains layers of neurons sequentially generated by distinct lineage-related progenitors. At the onset of corticogenesis, the first-born progenitors are apical progenitors (APs), whose asymmetric division gives birth directly to neurons. Later, they switch to indirect neurogenesis by generating intermediate progenitors (IPs), which give rise to projection neurons of all cortical layers. While a direct lineage relationship between APs and IPs has been established, the molecular mechanism that controls their transition remains elusive. Here we show that interfering with codon translation speed triggers ER stress and the unfolded protein response (UPR), further impairing the generation of IPs and leading to microcephaly. Moreover, we demonstrate that a progressive downregulation of UPR in cortical progenitors acts as a physiological signal to amplify IPs and promotes indirect neurogenesis. Thus, our findings reveal a contribution of UPR to cell fate acquisition during mammalian brain development.

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