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MARCKS Is Necessary for Netrin-DCC Signaling and Corpus Callosum Formation.

J J Brudvig1,2, J T Cain1, G G Schmidt-Grimminger1

  • 1Pediatrics and Rare Diseases Group, Sanford Research, Sioux Falls, SD, 57104, USA.

Molecular Neurobiology
|March 17, 2018
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Summary

Myristoylated alanine-rich C-kinase substrate (MARCKS) is essential for guiding brain axon development. This study reveals MARCKS organizes Netrin-1/DCC signaling, crucial for corpus callosum axon navigation.

Keywords:
Axon guidanceDccMarcksPtk2Src

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • The corpus callosum (CC) is vital for interhemispheric brain communication.
  • Axon guidance relies on chemoattractant and chemorepulsant cues.
  • Myristoylated alanine-rich C-kinase substrate (MARCKS) is implicated in CC formation, but its direct role in axon navigation is unclear.

Purpose of the Study:

  • To investigate the role of MARCKS in axon guidance signaling.
  • To determine if MARCKS is necessary for Netrin-1 (NTN1) and DCC receptor-mediated axon navigation.

Main Methods:

  • Utilized Marcks null (Marcks-/-) neurons.
  • Assessed neuronal response to exogenous NTN1.
  • Examined markers of DCC receptor activation.
  • Analyzed the subcellular distribution of PTK2 and SRC tyrosine kinases.

Main Results:

  • Marcks-/- neurons exhibited impaired responses to NTN1.
  • These neurons showed deficiencies in DCC activation markers.
  • MARCKS absence disrupted the localization of PTK2 and SRC, key NTN1-DCC signaling mediators.
  • MARCKS is critical for organizing DCC signaling at the cell membrane.

Conclusions:

  • MARCKS plays a novel and essential role in axon guidance.
  • MARCKS is a necessary organizer of Netrin-1/DCC signaling pathways.
  • This finding clarifies the molecular mechanisms underlying corpus callosum axon development.