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Sclerotome development and peripheral nervous system segmentation in embryonic zebrafish
E M Morin-Kensicki1, J S Eisen
1Institute of Neuroscience, University of Oregon, Eugene 97403-1254, USA.
Development (Cambridge, England)
|January 1, 1997
Summary
Sclerotome, a somite derivative, does not appear to pattern the peripheral nervous system in zebrafish embryos. Motor axon and sensory organ development proceeded largely normally after sclerotome ablation.
Area of Science:
- Developmental biology
- Embryology
- Neuroscience
Background:
- Vertebrate trunk structures exhibit segmentation, including somites and peripheral nervous system (PNS) elements.
- Avian studies suggest somite-derived sclerotome influences PNS segmental patterning.
Purpose of the Study:
- Investigate sclerotome development in zebrafish embryos.
- Determine the role of sclerotome in patterning motor axons and dorsal root ganglia.
Main Methods:
- Vital fluorescent dye labeling of somite cells to track migration and differentiation.
- Ablation of the ventromedial cell cluster to assess the impact on PNS development.
Main Results:
- Zebrafish sclerotome cells originate from the ventromedial somite cluster with anterior/posterior developmental distinctions.
- Anterior sclerotome migrates earlier and more restrictively, co-localizing with motor axons and neural crest cells.
- Sclerotome ablation minimally affected motor axon outgrowth and did not disrupt dorsal root ganglia or peripheral nerve development.
Conclusions:
- Sclerotome is not essential for the segmental patterning of the zebrafish peripheral nervous system.
- Peripheral nervous system segmentation may be regulated by interactions with other paraxial mesoderm derivatives, such as myotome.