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Differentiation of a Human Neural Stem Cell Line on Three Dimensional Cultures, Analysis of MicroRNA and Putative Target Genes
Published on: April 12, 2015
Mir-17-3p controls spinal neural progenitor patterning by regulating Olig2/Irx3 cross-repressive loop
Jun-An Chen1, Yuan-Ping Huang, Esteban O Mazzoni
1Departments of Pathology and Cell Biology, Neurology, and Neuroscience, Center for Motor Neuron Biology and Disease, Columbia University Medical Center, New York, NY 10032, USA.
Neuron
|February 23, 2011
Summary
MicroRNAs regulate neural progenitor identity by silencing Olig2 mRNA, ensuring correct spinal cord patterning. This prevents p2 progenitors from adopting pMN identity, crucial for V2 interneuron development.
Area of Science:
- Developmental biology
- Neuroscience
- Molecular biology
Background:
- Neural progenitor identity is established through transcriptional cross-repression.
- Olig2 and Irx3 transcription factors specify spinal motor neuron (pMN) and V2 interneuron (p2) progenitors.
- p2 progenitors transiently express Olig2, indicating complex regulatory mechanisms.
Purpose of the Study:
- To investigate the role of microRNAs in regulating Olig2 expression in p2 progenitors.
- To understand how microRNA-mediated silencing impacts spinal cord progenitor domain patterning.
- To elucidate the balance of cross-repressive interactions between Olig2 and Irx3.
Main Methods:
- Utilized mouse models lacking microRNAs or specific microRNA clusters (mir-17~92).
- Employed lineage tracing to track progenitor cell fates.
- Analyzed Olig2 mRNA levels and progenitor domain boundaries.
Main Results:
- MicroRNA-mediated silencing of Olig2 mRNA by mir-17-3p was identified as a key regulatory mechanism.
- Mice lacking microRNAs showed a dorsal shift in the pMN/p2 boundary.
- Impaired V2 interneuron production was observed in microRNA-deficient mice.
Conclusions:
- MicroRNA-mediated repression of Olig2 mRNA is critical for ventral spinal progenitor patterning.
- This repression shifts the balance of cross-repressive interactions between Olig2 and Irx3.
- Proper neural patterning relies on precise microRNA regulation of key transcription factors.
