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The neuron-intrinsic membrane skeleton is required for motor neuron integrity throughout lifespan
Carrie Ann Davison1, Daniela Garcia2, Chengye Feng1
1Department of Genetics, Yale University School of Medicine, New Haven, CT, USA.
Biorxiv : the Preprint Server for Biology
|March 10, 2025
Summary
Neuronal spectrin is essential for maintaining axon integrity. This study shows that degrading spectrin in GABA neurons causes axon breakage, highlighting its crucial role in nervous system health.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Axons are susceptible to physical stress, and their integrity is vital for nervous system function.
- Disruptions in axonal integrity are linked to neurodegenerative diseases and injuries.
- The spectrin-based membrane periodic skeleton (MPS) is hypothesized to maintain axonal strength and resilience.
Purpose of the Study:
- To investigate the cell-intrinsic role of β-spectrin/UNC-70 in maintaining GABAergic motor neuron integrity in *C. elegans*.
- To determine if β-spectrin is required for axonal integrity during development and in adulthood.
Main Methods:
- Utilized the auxin-inducible degron system for cell-type specific and time-dependent degradation of β-spectrin/UNC-70 in *C. elegans*.
- Focused on VD/DD GABAergic motor neurons.
- Examined axonal integrity following β-spectrin depletion in both developing and adult animals.
Main Results:
- Degradation of neuronal β-spectrin led to widespread axon breakage in VD/DD GABAergic motor neurons.
- Targeted depletion of β-spectrin specifically in GABA neurons caused significant axon breakage.
- Depletion of β-spectrin in mature neurons also induced axon breaks, indicating its importance in adulthood.
- Epidermal β-spectrin was found to be dispensable for VD/DD neuron axon integrity.
Conclusions:
- Neuronal β-spectrin/UNC-70 plays a critical cell-intrinsic role in maintaining axonal integrity.
- This role is essential throughout both the development and adult stages of the nervous system.
- Findings underscore the importance of the spectrin-based membrane skeleton for neuronal resilience.
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