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Mitotic spindle regulation by Nde1 controls cerebral cortical size
Yuanyi Feng1, Christopher A Walsh
1Department of Neurology, Howard Hughes Medical Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.
Neuron
|October 12, 2004
Summary
Nde1 protein is essential for brain development. Ablating Nde1 causes microcephaly by disrupting progenitor cell division, mitotic spindle assembly, and neuronal migration, crucial for a normal cerebral cortex.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- The LIS1-interacting protein Nde1 (formerly mNudE) plays a role in neuronal development.
- Understanding Nde1's function is crucial for comprehending mechanisms underlying brain size regulation and potential developmental disorders.
Purpose of the Study:
- To investigate the role of Nde1 in mammalian cerebral cortex development.
- To elucidate the cellular and molecular mechanisms affected by Nde1 ablation.
Main Methods:
- Generation and analysis of Nde1-deficient mouse models.
- BrdU birthdating to track neuronal migration.
- In vitro studies of centrosome duplication and mitotic spindle assembly.
Main Results:
- Nde1 ablation results in microcephaly, primarily affecting the cerebral cortex with reduced neuron numbers and thin superficial layers.
- Mutant embryos exhibit defects in progenitor cell division, mitotic progression, orientation, and chromosome localization.
- In vitro experiments confirm Nde1's essential role in centrosome duplication and mitotic spindle formation.
Conclusions:
- Nde1 is critical for normal mammalian cerebral cortex development.
- Disruption of mitotic spindle function and orientation due to Nde1 loss leads to reduced progenitor proliferation and altered neuronal cell fates, causing microcephaly.