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GPR56 and the developing cerebral cortex: cells, matrix, and neuronal migration.

Kathleen Singer1, Rong Luo, Sung-Jin Jeong

  • 1Division of Newborn Medicine, Department of Medicine, Boston Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA, 02115, USA.

Molecular Neurobiology
|September 25, 2012
PubMed
Summary

GPR56 protein is crucial for brain development. Its ligand, Collagen III, activates a pathway essential for preventing cortical malformations like bilateral frontoparietal polymicrogyria (BFPP).

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • GPR56 is an adhesion G protein-coupled receptor (GPCR) involved in cortical development.
  • Mutations in GPR56 lead to bilateral frontoparietal polymicrogyria (BFPP), a cortical malformation.
  • GPR56 has transitioned from an uncharacterized protein to a well-understood receptor.

Purpose of the Study:

  • To elucidate the specific role of GPR56 in the developing brain.
  • To understand the signaling pathway activated by GPR56.
  • To investigate the critical function of GPR56 in preplate neurons.

Main Methods:

  • The study focuses on the interaction between GPR56 and its ligand, Collagen III.
  • It examines the GPR56 signaling pathway involving RhoA activation via Gα(12/13) coupling.
  • Expression patterns of GPR56 in preplate neurons were analyzed in relation to malformation gradients.

Main Results:

  • Collagen III is identified as the ligand for GPR56 in the developing brain.
  • GPR56 activation by Collagen III triggers the RhoA/Gα(12/13) signaling pathway.
  • GPR56 expression in preplate neurons correlates with the anterior-to-posterior gradient of BFPP observed in humans and mice.

Conclusions:

  • GPR56 signaling is critical for proper cortical development and patterning.
  • The GPR56 pathway in preplate neurons is essential for preventing neuronal migration defects.
  • Further research into GPR56 in preplate neurons will illuminate mechanisms of cortical patterning.