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DNA sequences amplified in cancer cells: an interface between tumor biology and human genome analysis
1Department of Human Genetics, Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel.
Abstract:
There is growing evidence that amplification of specific genes is associated with tumor progression. While several proto-oncogenes are known to be activated by amplification, it is clear that not all the genes involved in DNA amplification in human tumors have been discovered. Our approach to the identification of such genes is based on the 'reverse genetics' methodology. Anonymous amplified DNA fragments are cloned by virtue of their amplification in a given tumor. These sequences are mapped in the normal genome and hence define a new genetic locus. The amplified domain is isolated by long-range cloning and analyzed along three lines of investigation: new genes are sought that can explain the biological significance of the amplification; the structure of the domain is studied in normal cells and in the amplification unit in the cancer cell; attempts are made to identify molecular probes of diagnostic value within the amplified domain. This application of genome technology to cancer biology is demonstrated in our study of a new genomic domain at chromosome 10q26 which is amplified specifically in human gastric carcinomas.
Insights
Researchers identified new genes driving cancer by studying DNA amplification in tumors. This reverse genetics approach helps discover novel cancer-related genes and diagnostic markers, specifically in gastric carcinomas.
Area of Science:
- Genomics
- Cancer Biology
- Molecular Oncology
Background:
- Gene amplification is linked to tumor progression.
- Not all amplified genes driving human tumors are identified.
- Proto-oncogenes are known targets of gene amplification.
Purpose of the Study:
- To identify novel genes involved in DNA amplification in human tumors.
- To apply reverse genetics for discovering new cancer-associated genes.
- To investigate a specific amplified genomic domain in gastric carcinomas.
Main Methods:
- Utilizing reverse genetics to clone anonymous amplified DNA fragments from tumors.
- Mapping amplified sequences to define new genetic loci in the normal genome.
- Employing long-range cloning to isolate amplified domains for detailed analysis.
Main Results:
- Identified a novel amplified genomic domain at chromosome 10q26.
- This domain is specifically amplified in human gastric carcinomas.
- Analysis focused on identifying new genes, studying domain structure, and finding diagnostic markers.
Conclusions:
- The reverse genetics approach is effective for discovering novel amplified genes in cancer.
- The identified 10q26 amplified domain is a specific feature of gastric carcinomas.
- This methodology aids in understanding tumor progression and developing diagnostic tools.