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Two different ways evolution makes neurons larger.

J M Bekkers1, C F Stevens

  • 1Section of Molecular Neurobiology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510.

Progress in Brain Research
|January 1, 1990
PubMed
Summary
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Brain evolution increases neuron size. Pyramidal neurons scale conservatively, preserving electrical properties, unlike dentate granule cells, revealing circuit design principles.

Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Computational Neuroscience

Background:

  • Brain evolution is associated with increases in neuron size.
  • Understanding neuronal scaling provides insights into brain circuit design principles.
  • Conservative scaling maintains passive cable properties, balancing proximal and distal dendritic inputs.

Purpose of the Study:

  • To compare the scaling of dentate granule cells and CA1 pyramidal neurons in cats and humans.
  • To determine how neuronal size increases during evolution and its implications for circuit function.

Main Methods:

  • Comparative analysis of dentate granule cells and CA1 pyramidal neurons across species (cat and human).
  • Examination of neuronal morphology and scaling principles, including conservative scaling.

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Main Results:

  • Both dentate granule cells and CA1 pyramidal neurons are larger in humans than in cats, with conserved general morphology.
  • CA1 pyramidal neurons exhibit conservative scaling, maintaining passive cable properties.
  • Dentate granule cells do not scale conservatively, suggesting different functional requirements.

Conclusions:

  • CA1 circuits appear to necessitate the conservation of passive cable properties, likely due to the significant impact of individual synaptic inputs.
  • Dentate granule cell circuits, which average numerous inputs, do not require conservative scaling.
  • Neuronal scaling strategies differ between brain regions based on the functional role of individual synaptic inputs.