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The degree of methylation at c-myc proto-oncogene was found to change during aging process of mice by the use of methylation-sensitive restriction enzymes. The spleen DNA showed hypomethylation as mice aged, while hypermethylation was observed in the liver DNA. The brain DNA on the contrary revealed no appreciable difference between young and old mice. When the DNAs were examined at actin and dihydrofolate reductase (DHFR), no significant change was observed. It suggests that an age-related change of oncogene structure may be one of the factors which are related to an age-associated increase of cancer incidence rate.
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