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Caveolin-1 regulates dorsoventral patterning through direct interaction with beta-catenin in zebrafish
1Key Laboratory of Biodiversity and Conservation of Aquatic Organism, Chinese Academy of Sciences, Wuhan, Hubei 430072, PR China.
Developmental Biology
|May 11, 2010
Summary
Caveolin-1 (Cav-1) is crucial for zebrafish embryonic development, regulating body patterning by controlling beta-catenin. Reduced Cav-1 leads to dorsal gene expansion, while increased Cav-1 causes ventralization.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- Caveolin-1 (Cav-1) regulates cellular signaling, including Wnt signaling, which is vital for early vertebrate embryonic development.
- The precise role of Cav-1 in zebrafish embryogenesis and its control over maternal beta-catenin activity remain unclear.
Purpose of the Study:
- To investigate the function of Cav-1 in zebrafish embryogenesis, specifically its role in dorsoventral patterning.
- To elucidate the mechanism by which Cav-1 influences Wnt/beta-catenin signaling during embryonic development.
Main Methods:
- Zebrafish embryos were analyzed for Cav-1 expression and function.
- Experiments involved ectopic Cav-1 expression and Cav-1 knockdown (using morpholinos).
- Interaction between Cav-1 and beta-catenin was studied, along with beta-catenin nuclear translocation.
Main Results:
- Cav-1 is essential for proper dorsoventral patterning in zebrafish embryos.
- Wnt and BMP signaling coordinately repress cav-1 transcription during development.
- Ectopic Cav-1 caused ventralization, while Cav-1 knockdown resulted in dorsal gene expansion.
- Cav-1 disrupts beta-catenin nuclear translocation via direct interaction, which is necessary for its ventralizing effect.
- Human Cav-1 exhibits conserved ventralizing activity in zebrafish.
Conclusions:
- Maternally expressed Cav-1 in zebrafish controls dorsoventral patterning by restricting the nuclear translocation of active beta-catenin.
- Cav-1 acts as a negative regulator of Wnt/beta-catenin signaling, impacting key developmental processes.
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