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Mutator phenotype in cancer: timing and perspectives
Jason H Bielas1, Lawrence A Loeb
1Joseph Gottstein Memorial Cancer Research Laboratory, Department of Pathology, University of Washington, Seattle, Washington 98195, USA.
Environmental and Molecular Mutagenesis
|January 27, 2005
Summary
Cancer cells exhibit a mutator phenotype, accumulating numerous mutations during tumor progression. This contrasts with normal cells
Area of Science:
- Genetics and Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Normal human cells exhibit high fidelity in DNA replication, with minimal errors per nucleotide polymerized.
- Stem cells, precursors to cancer, may possess even greater DNA replication accuracy.
- Tumors are characterized by significant cellular heterogeneity, chromosomal abnormalities, and DNA sequence alterations.
Purpose of the Study:
- To investigate the hypothesis that cancer cells develop a mutator phenotype during tumor progression.
- To reconcile the discrepancy between low mutation rates in normal cells and high mutation loads in tumors.
- To analyze the evidence, timing, and consequences of a mutator phenotype in human cancers.
Main Methods:
- Review and summarization of existing evidence supporting a mutator phenotype in human cancer.
- Analysis of recent measurements of mutation frequencies in human tumors.
- Consideration of the temporal expression of the mutator phenotype during tumorigenesis.
Main Results:
- Evidence supports the existence of a mutator phenotype in human cancer.
- Recent mutation measurements in human cancers are analyzed.
- The timing and consequences of this phenotype are discussed.
Conclusions:
- Cancer cells likely exhibit a mutator phenotype, contributing to their genetic instability.
- This phenotype leads to a large number of random mutations within human tumors.
- Understanding the mutator phenotype is crucial for comprehending tumor evolution and heterogeneity.