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The maternally expressed zebrafish T-box gene eomesodermin regulates organizer formation
Ashley E E Bruce1, Cristin Howley, Yi Zhou
1Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA. abruce@uchicago.edu
Development (Cambridge, England)
|October 8, 2003
Summary
Zebrafish eomesodermin (eomes) is a maternal gene crucial for early development. It specifies the organizer by activating key developmental genes, essential for proper embryonic patterning.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Maternal factors are vital for early embryonic development.
- T-box genes play significant roles in developmental processes.
Purpose of the Study:
- To clone and characterize the maternal T-box gene eomesodermin (eomes) in zebrafish.
- To investigate the role of eomes in early zebrafish embryonic development and organizer specification.
Main Methods:
- Cloning and characterization of the eomes gene.
- Analysis of eomes transcript and protein localization during oogenesis and early embryogenesis.
- Gene expression analysis using overexpression and knockdown (morpholino) techniques.
- Assays to determine eomes's transcriptional activity.
Main Results:
- Eomes transcript localizes to the oocyte cortex and shows a vegetal-to-animal gradient post-fertilization.
- Eomes protein is cytoplasmic initially, then becomes nuclear and dorsal-localized after midblastula transition.
- Ectopic expression of organizer markers (gsc, chd, flh) and secondary axis formation upon eomes overexpression.
- Eomes acts as a transcriptional activator, and its reduction impairs organizer gene expression.
Conclusions:
- Eomesodermin plays a critical role in specifying the zebrafish organizer.
- The localization and activation function of Eomes are key to its role in embryonic patterning.