Related Experiment Video
Updated: Jun 20, 2026
Methods for the Modulation and Analysis of NF-κB-dependent Adult Neurogenesis
Published on: February 13, 2014
PAR-1 phosphorylates Mind bomb to promote vertebrate neurogenesis
Olga Ossipova1, Jerome Ezan, Sergei Y Sokol
1Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.
Abstract:
Generation of neurons in the vertebrate central nervous system requires a complex transcriptional regulatory network and signaling processes in polarized neuroepithelial progenitor cells. Here we demonstrate that neurogenesis in the Xenopus neural plate in vivo and mammalian neural progenitors in vitro involves intrinsic antagonistic activities of the polarity proteins PAR-1 and aPKC. Furthermore, we show that Mind bomb (Mib), a ubiquitin ligase that promotes Notch ligand trafficking and activity, is a crucial molecular substrate for PAR-1. The phosphorylation of Mib by PAR-1 results in Mib degradation, repression of Notch signaling, and stimulation of neuronal differentiation. These observations suggest a conserved mechanism for neuronal fate determination that might operate during asymmetric divisions of polarized neural progenitor cells.
Insights
Neurogenesis involves opposing polarity proteins PAR-1 and aPKC. PAR-1 triggers Mind bomb (Mib) degradation, repressing Notch signaling to promote neuron generation in vertebrate neural progenitors.
Area of Science:
- Developmental biology
- Neuroscience
- Cell biology
Background:
- Neuronal generation in vertebrates relies on intricate transcriptional networks and signaling within polarized neuroepithelial progenitor cells.
- Understanding the molecular mechanisms governing neural progenitor cell fate is crucial for developmental neuroscience.
Purpose of the Study:
- To investigate the roles of polarity proteins PAR-1 and aPKC in vertebrate neurogenesis.
- To elucidate the molecular link between polarity signaling and Notch pathway regulation during neuronal differentiation.
Main Methods:
- In vivo studies using Xenopus laevis neural plate.
- In vitro analysis of mammalian neural progenitor cells.
- Biochemical assays to determine protein interactions and modifications (phosphorylation, degradation).
Main Results:
- Identified antagonistic activities of PAR-1 and aPKC in neurogenesis.
- Demonstrated that Mind bomb (Mib), a ubiquitin ligase, is a substrate for PAR-1.
- Showed PAR-1 mediated Mib phosphorylation leads to Mib degradation, Notch signaling repression, and neuronal differentiation.
Conclusions:
- A conserved mechanism involving PAR-1, aPKC, and Mib regulates neuronal fate determination.
- PAR-1's regulation of Mib and Notch signaling is key for stimulating neuronal differentiation in polarized neural progenitors.
- This pathway may be critical during asymmetric cell divisions in neural development.
