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The mathematics of neocortical neuronogenesis
T Takahashi1, R S Nowakowski, V S Caviness
1Department of Pediatrics, Keio University, School of Medicine, Tokyo, Japan.
Developmental Neuroscience
|January 1, 1997
Summary
Neuron production in the embryonic brain is regulated by cell cycle duration and the rate at which daughter cells exit the cell cycle. Small changes in these factors significantly alter neuronal output.
Area of Science:
- Developmental Neuroscience
- Cell Biology
- Neurogenesis
Background:
- Neocortical neuronogenesis, the creation of neurons in the cerebral cortex, originates in the pseudostratified ventricular epithelium (PVE).
- This process is crucial for forming the complex neural structures of the embryonic brain.
Purpose of the Study:
- To quantify the neuronogenetic interval in mice and analyze its regulatory parameters.
- To investigate the impact of altering cell cycle number and daughter cell exit rate (Q) on neuronal production.
Main Methods:
- Mathematical modeling of cell division and differentiation within the PVE.
- Analysis of theoretical variations in the number of cell cycles and the fraction of cells exiting the cycle (Q).
Main Results:
- The mouse neuronogenetic interval spans 6 days and involves 11 integer cell cycles.
- The fraction of daughter cells exiting the PVE (Q) reaches 0.5 by cell cycle 8, balancing proliferation and differentiation.
- Theoretical alterations in Q and cell cycle number demonstrated significant (50%-550%) changes in total neuronal output.
Conclusions:
- The number of cell cycles and the rate of cell cycle exit (Q) are critical regulators of neocortical neurogenesis.
- Variations in these parameters can lead to substantial amplifications or reductions in neuronal production.
- Understanding these regulatory mechanisms is key to comprehending brain development and potential developmental disorders.
Keywords:
Non-programmatic