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Identification and characterization of a functional zebrafish smrt corepressor (ncor2)
Elwood Linney1, Alyssa Perz-Edwards, Betty Kelley
1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA. elwood.linney@duke.edu
Gene
|July 20, 2011
Summary
Researchers isolated zebrafish corepressor smrt, finding it binds zebrafish retinoic acid receptor alpha (RARα) and is present in early embryos. This suggests a role in an embryonic epigenetic switch for gene regulation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Retinoic acid receptors (RARs) are part of the steroid receptor superfamily.
- RARs bind DNA response elements (RAREs) in promoter regions.
- In the absence of ligand, RARs bind corepressors like SMRT/N-CoR to repress gene expression.
Purpose of the Study:
- To isolate and characterize the zebrafish corepressor, smrt.
- To investigate the interaction between zebrafish smrt and zebrafish RARα.
- To determine the presence of smrt mRNA during early zebrafish embryonic development.
Main Methods:
- Isolation of the zebrafish corepressor, smrt.
- Co-immunoprecipitation assays to study smrt-RARα interaction.
- Whole mount in situ hybridization or RT-PCR to detect smrt mRNA in zebrafish embryos.
Main Results:
- The zebrafish corepressor smrt was successfully isolated.
- The association of zebrafish smrt with zebrafish RARα is sensitive to retinoic acid.
- smrt mRNA is detected in 8-cell stage zebrafish embryos, preceding embryonic genome activation.
Conclusions:
- The zebrafish smrt-RARα complex may function as an embryonic epigenetic switch.
- This complex potentially represses retinoic acid-responsive genes before retinoic acid availability.
- Provides insights into early gene regulation mechanisms in zebrafish development.
