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NeuroD homologue expression during cortical development in the human brain
A Franklin1, A Kao, S Tapscott
1Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, USA.
Journal of Child Neurology
|December 6, 2001
Summary
NeuroD3 acts as a determination factor for neuronal fate, while NeuroD1 and NeuroD2 are involved in neuronal differentiation in developing human brains. This study maps their expression patterns during human fetal brain development.
Area of Science:
- Developmental Neuroscience
- Molecular Biology
- Genetics
Background:
- Neurogenesis and neuronal differentiation are crucial processes regulated by NeuroD homologues, a family of basic helix-loop-helix transcription factors.
- Understanding the spatiotemporal expression of these factors is key to deciphering early human brain development.
Purpose of the Study:
- To characterize the expression patterns of NeuroD1, NeuroD2, and NeuroD3 in the human fetal brain across different gestational ages.
- To compare the expression of these homologues in human fetal brains with findings in mouse models.
Main Methods:
- In situ hybridization using full-length riboprobes for NeuroD1, NeuroD2, and NeuroD3.
- Acridine orange histofluorescence to distinguish neuronal from non-neuronal cell precursors.
Main Results:
- All three NeuroD homologues were detected from gestational week 16, with NeuroD3 showing the highest initial intensity.
- Peak expression for NeuroD1 and NeuroD2 occurred at gestational weeks 19 and 20, respectively.
- Expression was observed in the marginal zone, ventricular zone, and ganglionic eminence, with temporal patterns similar to mouse models despite anatomical differences.
Conclusions:
- NeuroD3 likely functions as a determination factor, committing progenitor cells to a neuronal fate.
- NeuroD1 and NeuroD2 appear to play roles in the subsequent process of neuronal differentiation.
- The findings provide insights into the distinct roles of NeuroD homologues in human neurodevelopment.