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Related Experiment Videos

Interneuron migration from basal forebrain to neocortex: dependence on Dlx genes

S A Anderson1, D D Eisenstat, L Shi

  • 1Nina Ireland Laboratory of Developmental Neurobiology, Center for Neurobiology and Psychiatry, Department of Psychiatry, University of California at San Francisco, CA 94143-0984, USA.

Science (New York, N.Y.)
|October 23, 1997
PubMed
Summary

A subpopulation of neocortical interneurons originates in the subcortical telencephalon, not solely the cortical proliferative zone. This migration is crucial for GABA-expressing cell presence in the neocortex.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Migration

Background:

  • Neocortical neurons are traditionally thought to arise from the cortical proliferative zone.
  • Recent evidence suggests a distinct origin for a subpopulation of neocortical interneurons.

Purpose of the Study:

  • To investigate the subcortical telencephalon as a potential origin for neocortical interneurons.
  • To elucidate the migratory pathways and developmental significance of these cells.

Main Methods:

  • In vitro cell migration assays using gamma-aminobutyric acid (GABA)-expressing cells.
  • Excision experiments separating neocortical and subcortical telencephalon tissues.
  • Analysis of knockout mice lacking DLX-1 and DLX-2 homeodomain proteins.

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Main Results:

  • GABA-expressing cells demonstrated migration from the subcortical telencephalon to the neocortex in vitro.
  • Separating these brain regions reduced the number of GABA-expressing cells in neocortical slices.
  • Mice deficient in DLX-1 and DLX-2 exhibited impaired subcortical-to-neocortical cell migration and reduced neocortical GABA cells.

Conclusions:

  • The subcortical telencephalon serves as a significant source for specific neocortical interneurons.
  • DLX-1 and DLX-2 proteins play a critical role in the migration of these interneurons.
  • This finding refines our understanding of neocortical development and neuronal origins.