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The Xenopus eomesodermin promoter and its concentration-dependent response to activin
K Ryan1, N Garrett, P Bourillot
1Wellcome CRC Institute, Cambridge, UK. ryank@email.chop.edu
Mechanisms of Development
|June 8, 2000
Summary
Eomesodermin gene expression in Xenopus is controlled by specific promoter regions responding to activin concentration. Researchers identified an activin response element (ARE) crucial for mesodermal development and patterning.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Embryology
Background:
- Eomesodermin (Eomes) is vital for early Xenopus mesoderm formation.
- Eomes exhibits a concentration-dependent response to activin, suggesting morphogen-like activity.
Purpose of the Study:
- To identify regulatory regions of the Eomesodermin promoter.
- To understand the mechanism of concentration-dependent activin response.
- To elucidate Eomesodermin's role in mesoderm patterning.
Main Methods:
- Promoter deletion analysis to define functional regions.
- Identification of specific DNA-binding sites within the promoter.
- Reporter gene assays to assess promoter activity in response to activin.
Main Results:
- An activin response element (ARE) located between -5.6 and -5.0 kb was identified.
- The ARE contains two critical FAST2 binding sites and is necessary and sufficient for activin response.
- A 5.6 kb promoter fragment recapitulates endogenous Eomes expression in mesodermal cells.
- A repressor element was found to inhibit Eomes expression in endodermal cells.
Conclusions:
- The identified ARE is a key regulatory module for Eomesodermin's response to activin gradients.
- These findings provide insights into mesoderm patterning and morphogen gradient interpretation in Xenopus.
- Understanding Eomesodermin regulation is crucial for comprehending early vertebrate development.