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Implications of Extended Inhibitory Neuron Development.

Jae-Yeon Kim1,2, Mercedes F Paredes1,2,3

  • 1Department of Neurology, University of California, San Francisco, CA 94143, USA.

International Journal of Molecular Sciences
|June 2, 2021
PubMed
Summary
This summary is machine-generated.

Larger brains with complex folds show a longer development for inhibitory neurons (GABAergic interneurons). This extended timeline aids in forming complex neural connections and cognitive flexibility.

Keywords:
GABAergic inhibitory neuronembryonic neurogenesisfunctional networkgyrencephalic brainpostnatal migration

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neuroanatomy

Background:

  • The development of inhibitory neurons, specifically GABAergic interneurons, is crucial for brain function.
  • Larger, gyrencephalic brains exhibit a prolonged developmental trajectory for these neurons compared to smaller brains.
  • Interneuron development, including generation, migration, and maturation, can extend over months, even postnatally.

Purpose of the Study:

  • To review the protracted development of GABAergic interneurons in the late gestational and postnatal forebrain.
  • To propose that extended interneuron development contributes to increased complexity and cognitive flexibility in larger brains.
  • To explore how this developmental feature allows for environmental influences on neural circuit formation.

Main Methods:

  • Review of existing literature on GABAergic interneuron development.
  • Analysis of species-specific developmental timelines for neurogenesis, migration, and integration.
  • Comparative study of developmental patterns in different brain sizes and gyrencephalization.

Main Results:

  • GABAergic interneuron development is significantly prolonged in larger, gyrencephalic animals, extending over months and into the postnatal period.
  • Late integration of interneurons follows a region-specific pattern, particularly in the early postnatal stages.
  • This protracted development is linked to the formation of functional connectivity and plasticity in higher cognitive cortical regions.

Conclusions:

  • The extended developmental timeline of GABAergic interneurons is a key mechanism underlying the enhanced complexity and cognitive flexibility observed in larger brains.
  • This prolonged neurodevelopmental process provides a critical window for environmental factors to shape neural circuit formation and function.
  • Understanding this extended development is vital for comprehending species-specific cognitive abilities and potential developmental disorders.