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Visualization of Craniofacial Development in the sox10: kaede Transgenic Zebrafish Line Using Time-lapse Confocal Microscopy
Published on: September 30, 2013
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Transcription factor Meis1b regulates craniofacial morphogenesis in zebrafish
Viktorie Psutkova1,2, Petr Nickl1, Veronika Brezinova1
1Department of Developmental Biology, Institute of Experimental Medicine, Czech Academy of Sciences, Prague, Czech Republic.
Summary
Zebrafish meis1b mutations cause larval lethality and abnormal craniofacial cartilage development. This impacts lower jaw muscle and tendon organization, highlighting Meis1b
Area of Science:
- Developmental Biology
- Genetics
- Zebrafish Models
Background:
- Meis family transcription factors are crucial for embryonic development via the Pbx-Meis-Hox network.
- While mouse studies are extensive, Meis factor roles in zebrafish development remain largely unexplored.
Purpose of the Study:
- To investigate the function of Meis family genes in zebrafish development, particularly in neural crest-derived craniofacial structures.
Main Methods:
- Generated zebrafish lines with null mutations in meis1a, meis1b, meis2a, and meis2b.
- Analyzed craniofacial development, focusing on cartilage, cranial nerves, tendons, and muscles in mutant lines.
Main Results:
- Only meis1b mutants exhibited larval lethality around 13 days post-fertilization.
- Meis1b mutants displayed significant morphogenetic abnormalities in Meckel's cartilage (lower jaw), including shortened, widened structures and fused symphysis.
- Abnormal chondrocyte organization in meis1b mutants led to impaired tendon and muscle fiber connections.
Conclusions:
- Loss-of-function mutations in zebrafish meis1b disrupt lower jaw cartilage morphology.
- This disruption results in disorganized muscle and tendon structures, underscoring meis1b's role in craniofacial development.
