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Endogenous mutations and cancer.

T M Reid¹, M Fry, L A Loeb

¹Joseph Gottstein Memorial Cancer Research Laboratory, Department of Pathology, University of Washington, Seattle 98195.

Princess Takamatsu Symposia

|January 1, 1991

Summary

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Spontaneous mutations from normal cell processes like DNA replication errors can cause cancer. Tumor mutation rates suggest a need to explore increased endogenous mutagenesis for malignancy development.

Area of Science:

Molecular Biology
Genetics
Cancer Research

Background:

Spontaneous mutations arise from normal cellular processes, including DNA replication errors, depurination, and oxidative damage.
Understanding the origins of mutations is crucial for comprehending cancer development.

Purpose of the Study:

To analyze the relationship between spontaneous mutations and cancer.
To investigate potential sources of endogenous mutations and their impact on tumor formation.

Main Methods:

Analysis of mutations produced by DNA polymerases in vitro.
Examination of depurination-induced mutations.
Assessment of mutations caused by oxygen free radical damage to DNA.

Main Results:

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DNA polymerase errors result in clustered single-base substitutions.
Depurination predominantly causes transversion mutations.
Oxygen free radicals induce single-base substitutions and a specific double-cytidine to thymidine mutation.
Observed mutation frequencies in tumors exceed spontaneous rates, suggesting increased mutagenesis.

Conclusions:

Normal cellular processes can generate mutations contributing to cancer.
The high mutation rate in tumors may necessitate postulating an increase in endogenous mutagenesis.
Further research into mutagenesis mechanisms is vital for cancer etiology.