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Related Experiment Videos

Disabled-1 mRNA and protein expression in developing human cortex.

Gundela Meyer1, Catherine Lambert De Rouvroit, Andre M Goffinet

  • 1Department of Anatomy, University La Laguna, Tenerife, Spain. gmeyer@ull.es

The European Journal of Neuroscience
|February 13, 2003
PubMed
Summary
This summary is machine-generated.

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Disabled-1 (Dab1) expression in the developing human brain begins early, peaking during cortical migration and potentially playing a role in neurogenesis and neuronal positioning.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The Reelin-Dab1 signaling pathway is crucial for neuronal positioning in the developing brain.
  • Dab1 deficiency leads to reeler-like cortical layer inversion.

Purpose of the Study:

  • To establish a temporal map of Disabled-1 (Dab1) mRNA and protein expression in the prenatal human cortex.
  • To investigate the role of Dab1 in early human brain development and neurogenesis.

Main Methods:

  • Analysis of Dab1 mRNA and protein expression in prenatal human cortex across different gestational weeks (GW).
  • Immunohistochemistry and colocalization studies to identify cell types expressing Dab1.
  • Assessment of neuronal morphology and dendritic orientation.

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Main Results:

  • Earliest Dab1 signal detected at 7 GW during the transition from preplate to cortical plate.
  • Peak Dab1 expression observed between 12-20 GW, coinciding with maximum cortical migration, primarily in upper cortical plate neurons.
  • Dab1 expression prolonged in hippocampus and entorhinal cortex pyramidal cells compared to neocortex.
  • Dab1 found in later-stage neurons in intermediate zone and subplate (18-25 GW).
  • High Dab1 levels in radial glia-like cells of the ventricular/subventricular zone (14-22 GW), suggesting a role in neurogenesis.
  • Colocalization of Dab1 and Reelin in a subset of Cajal-Retzius cells.

Conclusions:

  • Dab1 expression timing suggests its involvement in preplate partitioning and neuronal migration.
  • Dab1 expression patterns in radial glia and Cajal-Retzius cells indicate roles in neurogenesis and Reelin pathway signaling.
  • The study provides a detailed timetable of Dab1 expression, crucial for understanding human brain development.