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Related Experiment Videos

Neuronal position in the developing brain is regulated by mouse disabled-1

B W Howell1, R Hawkes, P Soriano

  • 1Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA. bhowell@fhcrc.org

Nature
|October 24, 1997
PubMed
Summary

Disrupting the disabled1 (mdab1) gene in mice impairs neuronal layering in the brain. The mDab1 protein may function in a Reelin-dependent pathway critical for guiding neuron migration during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Mammalian brain development involves radial migration of immature neurons to form distinct layers.
  • Proper neuronal positioning is crucial for the establishment of functional neural circuits.

Purpose of the Study:

  • To investigate the role of the disabled1 (mdab1) gene in mammalian brain development.
  • To understand the molecular mechanisms underlying neuronal migration and layering.

Main Methods:

  • Targeted gene disruption of the mouse disabled1 (mdab1) gene.
  • Analysis of neuronal layering in the cerebral cortex, hippocampus, and cerebellum of mdab1 mutant mice.
  • Expression and phosphorylation analysis of the mDab1 p80 protein.

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Main Results:

  • Targeted disruption of the mdab1 gene resulted in significant disturbances in neuronal layering.
  • The mdab1 mutant phenotype closely resembles that of the reeler mouse, which has defects in neuronal migration.
  • The cytoplasmic protein mDab1 p80 is expressed and tyrosine-phosphorylated in the developing nervous system.

Conclusions:

  • The mdab1 gene product, mDab1 p80, is essential for proper neuronal positioning during brain development.
  • mDab1 likely functions as an adaptor protein within a Reelin-regulated or parallel pathway.
  • These findings suggest a novel molecular mechanism controlling neuronal migration and cortical lamination.