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A large scale genetic analysis of c-Myc-regulated gene expression patterns
Brenda C O'Connell1, Ann F Cheung, Carl P Simkevich
1Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, Rhode Island 02912, USA.
The Journal of Biological Chemistry
|January 17, 2003
Summary
Myc proto-oncogenes drive cancer by altering gene expression. New methods reveal thousands of Myc target genes, impacting cell growth, metabolism, and communication, crucial for understanding cancer development.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Myc proto-oncogenes are critical transcriptional regulators implicated in numerous human cancers.
- Dysregulated Myc expression promotes cell growth, inhibits differentiation, and can induce apoptosis, but downstream effectors remain unclear.
Purpose of the Study:
- To establish an optimized biological system for comprehensive profiling of Myc target genes.
- To identify genes directly and indirectly regulated by Myc across a range of expression levels.
Main Methods:
- Development of isogenic cell lines with c-myc knockout and conditional expression.
- Modulation of Myc activity from null to supraphysiological levels.
- High-throughput gene expression profiling to identify Myc-responsive genes.
Main Results:
- A novel system yielded a significantly increased and reproducible set of Myc target genes.
- Identified a subset of genes optimally regulated by Myc within its physiological expression range.
- Observed widespread transcriptional changes affecting thousands of genes, both directly and indirectly.
Conclusions:
- Myc activation induces a metabolic shift towards biosynthesis and biomass accumulation.
- Myc repression affects genes involved in cell-cell interactions and possesses anti-proliferative/anti-metastatic functions.
- Understanding these Myc-regulated pathways is key to developing targeted cancer therapies.