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Tyrosine phosphorylation is essential for DSCAML1 to promote dendrite arborization of mouse cortical neurons

Shaoqian Cui1, Limin Lao, Jingzhu Duan

  • 1Department of Orthopedics, Shengjing Hospital, China Medical University, Shenyang, China.

Neuroscience Letters
|October 3, 2013
PubMed

Insights

Down syndrome cell adhesion molecule like-1 (DSCAML1) promotes dendritic self-avoidance in cortical neurons. Phosphorylation at tyrosine 1808 is essential for DSCAML1 to regulate dendrite branching and prevent self-crossing.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Dendritic self-avoidance is crucial for the precise wiring of neuronal circuits.
  • The precise molecular mechanisms governing dendritic self-avoidance remain incompletely understood.

Purpose of the Study:

  • To investigate the role of Down syndrome cell adhesion molecule like-1 (DSCAML1) in dendritic self-avoidance.
  • To determine if tyrosine phosphorylation mediates DSCAML1's function in regulating dendrite arborization.

Main Methods:

  • Knockdown of DSCAML1 in newborn mouse cortical neurons.
  • Introduction of a DSCAML1(Y1808F) mutant into DSCAML1-knocked down neurons.
  • Analysis of dendritic arborization patterns, including self-avoidance, fasciculation, and self-crossing.

Main Results:

  • DSCAML1 knockdown resulted in impaired dendritic self-avoidance, characterized by increased dendritic fasciculation and self-crossing.
  • Restoration of DSCAML1 with a Y1808F mutation failed to rescue the observed dendritic arborization defects.
  • These findings indicate that phosphorylation at tyrosine 1808 is critical for DSCAML1's function.

Conclusions:

  • DSCAML1 plays a significant role in promoting dendritic self-avoidance in cortical neurons.
  • Tyrosine phosphorylation at Y1808 is essential for DSCAML1-mediated regulation of dendritic self-avoidance and arborization.
Keywords:
DIVDSCAMDSCAML1Dendrite arborizationDown syndrome cell adhesion moleculeDown syndrome cell adhesion molecule like-1PAK1RNA interferenceSelf-avoidanceTyrosine phosphorylationday in vitrop21 activated kinase

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