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Specification of layer-specific connections in the developing cortex

J Bolz1, V Castellani, F Mann

  • 1INSERM Unité 371 Cerveau et Vision, Lyon/Bron, France.

Progress in Brain Research
|January 1, 1996
PubMed
Summary
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Membrane-associated molecules guide developing axons in the mammalian cerebral cortex. These substrate-bound cues are crucial for forming specific neuronal connections and regulating axonal guidance during development.

Area of Science:

  • Neurobiology
  • Developmental Neuroscience
  • Molecular Neuroscience

Background:

  • Understanding the precise formation of neuronal connections in the developing brain is a fundamental neurobiology challenge.
  • Recent in vitro studies focus on the mammalian cerebral cortex to elucidate mechanisms of connection specificity.

Purpose of the Study:

  • To review recent in vitro studies on the developing mammalian cerebral cortex.
  • To highlight the role of membrane-associated molecules in establishing specific cortical connections.

Main Methods:

  • Review of in vitro studies on the developing mammalian cerebral cortex.
  • Analysis of molecular mechanisms guiding axonal growth and target recognition.

Main Results:

Related Experiment Videos

  • Membrane-associated, substrate-bound molecules guide growing axons, regulate thalamocortical innervation timing, and mediate target recognition.
  • A novel glycoprotein in developing white matter influences thalamic and cortical axon segregation.
  • Layer-specific molecular cues control cortical axon branching, suggesting conserved strategies for intrinsic and extrinsic circuits.

Conclusions:

  • Substrate-bound molecules are instrumental in forming specific cortical projections and local circuits.
  • These molecules provide a framework for activity-dependent mechanisms shaping precise neural connections.
  • Identifying guidance factors like netrins and semaphorins/collapsins is key to understanding cortical development, plasticity, and repair.