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Baf60c is essential for function of BAF chromatin remodelling complexes in heart development
Heiko Lickert1, Jun K Takeuchi, Ingo Von Both
1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada.
Nature
|November 5, 2004
Summary
Smarcd3 (Baf60c) is crucial for heart development in mouse embryos. Its proper expression ensures correct cardiac and skeletal muscle formation, preventing congenital heart defects.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Tissue-specific transcription factors are essential for embryonic development.
- Chromatin structure influences gene regulation during development.
- BAF complexes are enzymatic complexes that remodel chromatin.
Purpose of the Study:
- To investigate the role of Smarcd3 (Baf60c) in embryonic development, particularly in heart and muscle formation.
- To understand the mechanism by which Baf60c regulates gene expression in specific tissues.
Main Methods:
- RNA interference (RNAi) to silence Smarcd3 in mouse embryos derived from embryonic stem cells.
- Analysis of heart morphogenesis, cardiac and skeletal muscle differentiation.
- Cell culture experiments to study Baf60c interactions with transcription factors and Brg1.
Main Results:
- Smarcd3 is specifically expressed in the heart and somites of early mouse embryos.
- Smarcd3 silencing causes defects in heart morphogenesis, including impaired anterior/secondary heart field expansion.
- Reduced Smarcd3 expression leads to abnormal muscle differentiation and outflow tract remodeling defects, mimicking human congenital heart defects.
- Baf60c facilitates interactions between cardiac transcription factors and Brg1, enhancing target gene activation.
Conclusions:
- Smarcd3 plays a tissue-specific and dose-dependent role in recruiting BAF chromatin remodeling complexes to heart-specific enhancers.
- This provides a novel mechanism for ensuring transcriptional regulation during organogenesis.
- Baf60c is critical for normal heart development and preventing congenital heart defects.
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