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Related Experiment Videos

Numbers, time and neocortical neuronogenesis: a general developmental and evolutionary model

V S Caviness1, T Takahashi, R S Nowakowski

  • 1Dept of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.

Trends in Neurosciences
|September 1, 1995
PubMed
Summary

Neocortex neuron count depends on initial proliferative cells and neuron production amplification. Amplification increases with more cell cycles having a low output fraction, influencing neuronal diversity.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Computational Biology

Background:

  • Neocortical neuron number is a key determinant of brain complexity.
  • Understanding the mechanisms regulating neuron production is crucial for neuroscience.

Purpose of the Study:

  • To elucidate the factors governing the number of neurons in the neocortex.
  • To explore the relationship between cell cycle dynamics and neuron production.

Main Methods:

  • Mathematical modeling of cell proliferation and differentiation.
  • Analysis of cell cycle parameters and output fractions during neuronogenesis.

Main Results:

  • Neuron number is determined by the initial founder cell population and neuronogenetic amplification.

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  • Neuronogenetic amplification is modulated by the output fraction (Q) over cell cycles.
  • Increased amplification occurs when the output fraction is less than 0.5 for more cell cycles.

    • Conclusions:

    • Cell cycle dynamics, specifically the output fraction, play a critical role in determining neocortical neuron number.
    • Variations in cell cycle parameters, not absolute time, are likely drivers of neuronal diversity across species.