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Updated: May 6, 2026
07:13
3D Modeling of Dendritic Spines with Synaptic Plasticity
Published on: May 18, 2020
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Stochastic growth and ligand-receptor interaction-mediated stabilization generate stereotyped dendritic arbors
Rebecca Shi1,2, Xue Yan Ho1, Li Tao3
1Department of Biology, Stanford University, Stanford, CA, USA.
Nature Neuroscience
|May 4, 2026
Summary
Ligand-free guidance receptors drive stochastic dendritic growth, while external ligands prevent retraction and shape the arbor. This clarifies neuronal development and guidance receptor function.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Neuronal development involves complex dendritic arbor formation.
- Guidance receptors and ligands are crucial for shaping dendritic arbors.
- Previous work identified SAX-7/LICAM and DMA-1 in PVD dendrite development.
Purpose of the Study:
- Investigate the structure-function relationship of the DMA-1 guidance receptor.
- Clarify the roles of ligand binding versus ligand-free DMA-1 in dendritic growth and arbor patterning.
- Elucidate the mechanism of DMA-1 recycling in maintaining dendritic growth.
Main Methods:
- Structure-function analysis of the DMA-1 receptor.
- Genetic manipulation of DMA-1 endocytosis and recycling pathways in C. elegans.
- Microscopic analysis of PVD sensory dendrite morphology.
Main Results:
- Robust, stochastic dendritic growth occurs independently of DMA-1 ligand binding.
- Ligand binding to DMA-1 inhibits dendrite retraction and ectopic growth, specifying arbor shape.
- Ligand-free DMA-1, maintained by endocytosis and recycling, is essential for continuous dendritic growth.
- Defects in DMA-1 endocytosis lead to severely truncated dendrites.
Conclusions:
- Ligand-free DMA-1 mediates intrinsic, stochastic dendritic growth.
- Extracellular ligands instruct dendritic arbor shape by modulating DMA-1 activity.
- A dynamic cycle of DMA-1 endocytosis and recycling is critical for neuronal development.
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