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Microtubule minus-end binding protein CAMSAP2 controls axon specification and dendrite development
Kah Wai Yau1, Sam F B van Beuningen2, Inês Cunha-Ferreira2
1Cell Biology, Faculty of Science, Utrecht University, 3584 CH, Utrecht, The Netherlands; Department of Neuroscience, Erasmus Medical Center, 3015 GE Rotterdam, The Netherlands.
Neuron
|June 9, 2014
Summary
Microtubule minus-ends in neurons are stabilized by CAMSAP2, a protein crucial for neuronal organization and development. This protein, along with gamma-Tubulin, guides the formation and function of non-centrosomal microtubules.
Area of Science:
- Cell Biology
- Neuroscience
- Cytoskeleton Dynamics
Background:
- Most neuronal microtubules are non-centrosomal, with both minus and plus-ends located throughout the cell.
- While microtubule plus-end dynamics are well-studied, the function of minus-ends remains poorly understood.
Purpose of the Study:
- To investigate the role of microtubule minus-ends in neuronal organization.
- To identify proteins regulating non-centrosomal microtubules in neurons.
Main Methods:
- Live-cell imaging
- High-resolution microscopy
- Laser-based microsurgery
Main Results:
- CAMSAP2 specifically localizes to non-centrosomal microtubule minus-ends.
- CAMSAP2 is essential for stabilizing these microtubules, neuronal polarity, axon specification, and dendritic branching.
- Non-centrosomal microtubules in dendrites are primarily nucleated by gamma-Tubulin.
Conclusions:
- A two-step model for non-centrosomal microtubule formation is proposed: gamma-Tubulin initiates nucleation, and CAMSAP2 stabilizes the minus-ends.
- CAMSAP2 and gamma-Tubulin-mediated microtubule organization are critical for neuronal polarity and development.
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