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A 3' enhancer controls snail expression in melanoma cells.
Matthew B Palmer1, Parimal Majumder, Myesha R Green
1Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.
Cancer Research
|July 10, 2007
Summary
The snail gene
Area of Science:
- Molecular Biology
- Cancer Research
- Epigenetics
Background:
- The snail gene is crucial for development and epithelial-mesenchymal transitions in cancer.
- Precise transcriptional control of snail is essential, as its aberrant activation drives cancer progression.
- Understanding snail gene regulation offers insights into cancer mechanisms.
Purpose of the Study:
- To investigate the molecular mechanisms controlling snail gene transcription.
- To analyze chromatin structural changes associated with snail transcription in melanoma.
Main Methods:
- Chromatin accessibility assays (DNase hypersensitivity sites).
- Histone modification analysis (H3 Lys(4) dimethylation/trimethylation, H3 acetylation).
- Reporter gene assays to test enhancer activity.
- Chromosomal conformation capture (3C) to assess enhancer-promoter interaction.
Main Results:
- Snail promoter has constitutive DNase hypersensitive sites and moderate H3 Lys(4) dimethylation.
- A tissue-specific 3' enhancer, conserved in mammals, activates snail expression in melanoma cells.
- Enhancer activity correlates with specific histone modifications and physical interaction with the snail promoter.
Conclusions:
- Melanoma cells activate the snail gene through a poised chromatin structure and a tissue-specific 3' enhancer.
- This enhancer physically interacts with the snail promoter, driving its expression in cancer.
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