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Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
Published on: October 18, 2013
"Lineage addiction" in human cancer: lessons from integrated genomics
L A Garraway1, B A Weir, X Zhao
1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
Cold Spring Harbor Symposia on Quantitative Biology
|July 28, 2006
Summary
Scientists identified MITF as an amplified oncogene in melanoma, suggesting "lineage addiction" is a key tumor survival mechanism. This discovery has significant implications for developing targeted cancer therapies.
Area of Science:
- Oncology
- Genomics
- Molecular Biology
Background:
- Targeted cancer therapies require understanding tumor-specific molecular alterations.
- High-density single-nucleotide polymorphism (SNP) arrays facilitate high-resolution genomic characterization of tumors.
- Lineage-restricted copy number alterations may indicate novel cancer genes.
Purpose of the Study:
- To investigate the role of lineage-restricted genomic alterations in cancer.
- To identify critical dependencies within individual tumors using genome-scale data.
- To explore the therapeutic implications of "lineage addiction" in melanoma.
Main Methods:
- Utilized DNA microarray platforms, specifically high-density SNP arrays, for cancer genome characterization.
- Performed clustering analyses on SNP array data from a large collection of tumor samples and cell lines.
- Conducted combined analysis of gene expression data and functional studies on the NCI60 cancer cell line collection.
Main Results:
- Identified a strong correlation between certain copy number alterations and tissue of origin.
- Discovered increased dosage of the MITF gene in melanoma cell lines, located on chromosome 3p.
- Established MITF as an amplified oncogene in melanoma through integrated genomic and functional analyses.
Conclusions:
- MITF amplification in melanoma suggests a "lineage addiction" survival mechanism, analogous to oncogene addiction.
- MITF may function as a nodal point in a critical lineage survival pathway in a subset of melanomas.
- Understanding lineage addiction offers potential new avenues for targeted cancer therapeutics.
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