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Generation of Parabiotic Zebrafish Embryos by Surgical Fusion of Developing Blastulae
Published on: June 11, 2016
Cell mixing during early epiboly in the zebrafish embryo
E T Wilson1, C J Cretekos, K A Helde
1Department of Human Genetics, Eccles Institute of Human Genetics, University of Utah, Salt Lake City 84112, USA.
Developmental Genetics
|January 1, 1995
Summary
Zebrafish gastrulation involves cell mixing driven by blastoderm shape changes. Maternal factors in early blastomeres may influence mesendoderm development, impacting embryonic patterning.
Area of Science:
- Developmental biology
- Zebrafish embryogenesis
- Cellular mechanics
Background:
- Cellular distribution in early zebrafish embryos is crucial for development.
- Understanding the forces shaping the blastoderm is key to deciphering cell fate.
- Previous models did not fully explain cell mixing during gastrulation.
Purpose of the Study:
- To model the forces influencing cell distribution in the early zebrafish gastrula.
- To investigate the role of epiboly and yolk cell doming in zebrafish cell mixing.
- To explore the potential contribution of maternal determinants to embryonic patterning.
Main Methods:
- Development of a biophysical model for blastoderm cell distribution.
- Analysis of cell mixing timing, extent, and direction during zebrafish epiboly.
- Tracking of blastomere descendants to map cell origins and fates.
Main Results:
- A model accurately predicts cell distribution based on forces during blastoderm shape changes.
- Upward doming of the yolk cell during epiboly drives significant cell mixing.
- A marginal region, giving rise to mesendoderm, shows minimal cell mixing, retaining original blastomere descendants.
Conclusions:
- Zebrafish gastrula cell patterning arises from passive responses to reproducible forces during blastoderm morphogenesis.
- Yolk cell doming during epiboly is a key mechanism for cell mixing.
- The specific inheritance of marginal blastomere cytoplasm by mesendodermal precursors suggests a role for maternal factors in initiating zebrafish embryonic patterning.
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