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Ex Vivo Culture of Chick Cerebellar Slices and Spatially Targeted Electroporation of Granule Cell Precursors
Published on: December 14, 2015
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Notch Signaling between Cerebellar Granule Cell Progenitors
Toma Adachi1,2, Satoshi Miyashita3, Mariko Yamashita1,4
1Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo 187-8551, Japan.
Eneuro
|March 25, 2021
Summary
Notch signaling distinguishes cerebellar progenitor cells, controlling their proportional differentiation. This process generates immature and differentiating cells, crucial for organized cerebellar granule cell development.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Cerebellar granule cells (GCs) are the most abundant neurons, vital for motor control, learning, and cognition.
- GC development involves progenitor cells (GCPs) producing both GCs and more GCPs, but the regulation of this balance is unclear.
Purpose of the Study:
- To investigate the molecular mechanisms regulating proportional cell fate decisions in cerebellar progenitor cells.
- To elucidate the role of Notch signaling in GCP differentiation and the generation of distinct progenitor subpopulations.
Main Methods:
- In vivo monitoring of Hes1-promoter activity in mouse cerebellar progenitor cells.
- Single-cell RNA sequencing (scRNA-seq) and in silico analysis.
- In vivo electroporation for gene overexpression and knockdown (KD) studies.
Main Results:
- Identified two distinct GCP populations: Notch-signaling ON (proliferative, immature) and Notch-signaling OFF (differentiating).
- Notch2 and Hes1 act cell-autonomously to inhibit GCP differentiation by suppressing Neurod1.
- Jag1 promotes differentiation by non-autonomously activating Notch signaling in neighboring GCPs.
Conclusions:
- Notch signaling establishes distinct GCP states, controlling the proportional generation of immature and differentiating progenitors.
- This mechanism ensures the well-organized differentiation of cerebellar granule cells, impacting motor coordination and cognitive functions.
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