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FLRT structure: balancing repulsion and cell adhesion in cortical and vascular development.

Elena Seiradake1, Daniel del Toro2, Daniel Nagel3

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Fibroblast-like growth factor (FLRT) proteins mediate cell adhesion and repulsion. This study reveals their structural basis and function in neuronal development and vascular cells.

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Area of Science:

  • Molecular biology
  • Neuroscience
  • Developmental biology

Background:

  • Fibroblast-like growth factors (FLRTs) function as both homophilic cell adhesion molecules and heterophilic repulsive ligands for Unc5/Netrin receptors.
  • The precise mechanisms governing FLRT-mediated cell behavior and their structural underpinnings are not fully understood.

Purpose of the Study:

  • To elucidate the structural mechanisms of FLRT-mediated cell adhesion and repulsion in neurons.
  • To investigate the role of FLRTs in cortical development, specifically in neuronal migration and spatial organization.
  • To determine the conservation of FLRT adhesion and repulsion mechanisms across different cell types.

Main Methods:

  • X-ray crystallography was employed to determine the distinct structural features of FLRT interactions.
  • Functional studies in cortical development were conducted to observe FLRTs' impact on neuronal migration and spread.
  • Comparative analysis was performed to assess FLRT mechanism conservation in vascular endothelial cells.

Main Results:

  • Distinct structural bases for FLRT homophilic adhesion and heterophilic repulsion were identified.
  • FLRTs were shown to regulate both radial migration and tangential spread of pyramidal neurons during cortical development.
  • Repulsive FLRT2-Unc5D interactions control radial migration, while adhesive FLRT-FLRT interactions govern tangential organization.
  • The fundamental mechanisms of FLRT adhesion and repulsion are conserved between neuronal and vascular endothelial cells.

Conclusions:

  • FLRT proteins possess structurally encoded repulsive and adhesive surfaces, acting as potent guidance factors.
  • FLRTs play critical roles in orchestrating neuronal positioning during cortical development.
  • The conserved nature of FLRT functions highlights their fundamental importance in cell guidance across different biological systems.