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Chromatin immunoprecipitation-based screen to identify functional genomic binding sites for sequence-specific
Jamie M Hearnes1, Deborah J Mays, Kristy L Schavolt
1Department of Biochemistry, Center for Molecular Toxicology, Vanderbilt-Ingram Cancer Center, Nashville, TN 37232-6838, USA.
Molecular and Cellular Biology
|November 2, 2005
Summary
Researchers developed a new method combining ChIP and yeast assays to identify transcription factor binding sites and their target genes. This approach revealed novel p53 target genes, enhancing our understanding of disease molecular mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- Altered gene expression is linked to human diseases, often due to dysregulated transcription factor activity.
- Comprehensive analysis of transcription factor networks is crucial for understanding disease at a molecular level.
Purpose of the Study:
- To develop and validate an experimental approach for genome-wide screening of transcription factor binding sites and their target genes.
- To identify novel p53 binding sites and target genes involved in various signaling pathways.
Main Methods:
- Combined chromatin immunoprecipitation (ChIP) with a yeast-based assay for genome-wide screening.
- Utilized primary and immortalized human mammary epithelial cells.
- Isolated and validated novel p53 binding sites and target genes.
Main Results:
- Identified over 100 novel p53 binding sites in human mammary epithelial cells.
- Validated novel p53 target genes involved in growth factor, protein kinase/phosphatase, and RNA binding signaling pathways.
- Provided a more complete understanding of p53-regulated signaling.
Conclusions:
- The developed ChIP-yeast assay approach is effective for identifying transcription factor binding sites and target genes.
- This method can be broadly applied to elucidate complex transcriptional networks for various transcription factors.
- Enhances understanding of molecular mechanisms in human diseases related to transcription factor activity.