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Updated: May 20, 2026
11:39
The Mouse Hindbrain As a Model for Studying Embryonic Neurogenesis
Published on: January 29, 2018
Signalling from hindbrain boundaries regulates neuronal clustering that patterns neurogenesis
Javier Terriente1, Sebastian S Gerety, Tomomi Watanabe-Asaka
1Division of Developmental Neurobiology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
Development (Cambridge, England)
|July 6, 2012
Summary
Zebrafish hindbrain segmentation relies on semaphorin signaling to cluster FGF20A-expressing neurons. This precise neuron positioning is crucial for regulating neurogenesis and preventing excessive neuronal differentiation.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Neural progenitor cells differentiate into specific neurogenic and non-neurogenic zones during central nervous system development.
- In zebrafish hindbrain development, FGF20A from segment center neurons inhibits neuronal differentiation in adjacent progenitors.
Purpose of the Study:
- To identify the molecular mechanism responsible for clustering FGF20A-expressing neurons in hindbrain segment centers.
- To understand the role of this precise neuronal positioning in regulating neurogenesis.
Main Methods:
- Investigated the role of hindbrain boundary cells and semaphorin signaling (Sema3fb, Sema3gb) and their receptor (Nrp2a) in organizing FGF20A-expressing neurons.
- Examined the effects of disrupting boundary cells or semaphorin signaling on neuron organization, FGF target gene expression, and neurogenesis.
Main Results:
- Hindbrain boundary cells and semaphorin signaling (Sema3fb/Sema3gb) mediated by Nrp2a are essential for clustering FGF20A-expressing neurons at segment centers.
- Disruption of boundaries or semaphorin signaling caused dispersal of FGF20A-expressing neurons.
- This dispersal led to reduced FGF target gene expression and increased neuronal differentiation.
Conclusions:
- Semaphorin signaling from hindbrain boundaries is a key mechanism linking segmentation to the precise positioning of FGF20A-expressing neurons.
- This positioning is critical for regulating the extent of neurogenesis in the developing zebrafish hindbrain.
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