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Ordered arrangement of dendrites within a C. elegans sensory nerve bundle
Zhiqi Candice Yip1,2, Maxwell G Heiman1,2
1Division of Genetics and Genomics, Boston Children's Hospital, Boston, United States.
Elife
|August 18, 2018
Summary
Cell adhesion molecules (CAMs) in C. elegans organize dendrite patterns in the sensory nerve bundle. Disrupting specific CAMs leads to random or altered dendrite arrangements, revealing principles of biological self-organization.
Area of Science:
- Developmental biology
- Neuroscience
- Cell biology
Background:
- Biological systems exhibit inherent order and can adapt to perturbations.
- Understanding the principles of biological order is crucial for fields like developmental biology and neuroscience.
- The nematode C. elegans offers a genetically tractable model for studying fundamental biological processes due to its simple anatomy.
Purpose of the Study:
- To identify the underlying principles governing the stereotyped arrangement of dendrites in the C. elegans sensory nerve bundle.
- To investigate the role of cell adhesion molecules (CAMs) in establishing and maintaining dendrite order.
- To explore how perturbations, such as genetic mutations, affect dendrite self-organization.
Main Methods:
- Developed a quantitative method to assess the arrangement of three specific dendrites within the main sensory nerve bundle of C. elegans.
- Utilized genetic manipulation in C. elegans to study the effects of gene loss or misexpression on dendrite patterning.
- Observed dendrite arrangements throughout various larval growth stages.
Main Results:
- Dendrites in C. elegans exhibit a consistent, stereotyped arrangement during larval development, independent of sensory cilia or glial junctions.
- Loss of the cell adhesion molecule CDH-4/Fat-like cadherin resulted in random dendrite ordering, while the dendrites remained bundled.
- Disruption of other CAMs, PTP-3/LAR or SAX-7/L1CAM, led to altered and progressively random dendrite orders with animal growth. Misexpression of SAX-7 caused subtle, reproducible changes in dendrite order.
Conclusions:
- Combinations of cell adhesion molecules (CAMs) are essential for the self-organization of dendrites into stereotyped patterns in C. elegans.
- Specific CAMs play distinct roles in establishing and maintaining dendrite order, with perturbations leading to predictable alterations in arrangement.
- These findings provide insights into the molecular mechanisms underlying self-organization and pattern formation in biological systems.
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