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FEZ1 Forms Complexes with CRMP1 and DCC to Regulate Axon and Dendrite Development.

Jie Yin Chua1, Shi Jun Ng1, Oleksandr Yagensky2

  • 1Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore.

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|March 27, 2021
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Summary

Fasciculation and elongation protein zeta 1 (FEZ1) is crucial for neuronal development. It integrates guidance cues with intracellular transport, essential for axon and dendrite growth during network formation.

Keywords:
CRMP1DCCFEZ1axondendritedevelopment

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Neuronal process elaboration is vital for forming neural networks.
  • Coordination between guidance cues and intracellular trafficking is essential but poorly understood.

Purpose of the Study:

  • To investigate the role of fasciculation and elongation protein zeta 1 (FEZ1) in neuronal development.
  • To characterize the interaction between FEZ1 and collapsin response mediator protein 1 (CRMP1) at neuronal growth cones.

Main Methods:

  • FEZ1 and CRMP1 loss-of-function studies in rat hippocampal neurons.
  • Analysis of growth cone morphology, axonal development, and dendritic complexity.
  • Immunocolocalization studies with VAMP2, DCC, and Syntaxin-1.
  • Assessment of neuronal response to guidance cues like Netrin-1 and Sema3A.

Main Results:

  • FEZ1 deficiency impairs axonal development and causes growth cone collapse, similar to CRMP1 loss-of-function.
  • FEZ1-deficient neurons show reduced dendritic complexity, exceeding that of CRMP1-deficient neurons.
  • FEZ1 colocalizes with VAMP2 and forms complexes with DCC and Syntaxin-1.
  • FEZ1 deficiency disrupts neuronal responses to Netrin-1 and Sema3A signaling.

Conclusions:

  • FEZ1 is a key effector integrating guidance signaling with intracellular trafficking for axo-dendritic development.
  • FEZ1 plays a critical role in neuronal network formation by mediating axon and dendrite elaboration.
  • FEZ1 influences multiple developmental signaling pathways beyond CRMP1 interaction.