Human Molecular Genetics, Vol 3, 1487-1495, Copyright © 1994 by Oxford University Press
PW Laird and R Jaenisch
Changes in the pattern of DNA methylation have been a consistent finding in
cancer cells. The mostly descriptive nature of these studies and the fact
that both hypo- and hypermethylation have been observed at various loci
have made it difficult to assess whether these changes are causally
involved in the transformation process or whether they reflect the altered
physiology of rapidly dividing cancer cells. It is clear, however, that DNA
methylation plays an important role in the generation of mutations in human
tumors. The high incidence of C-to-T transitions found in the p53
tumor-suppressor gene is attributed to the spontaneous deamination of
5-methylcytosine residues. The multiple observations linking DNA
methylation to cancer can be resolved in a model proposing that the high
rate of mutation at CpG dinucleotides is due in part to
methyltransferase-facilitated deamination. Support for a role of DNA
methyltransferase as a mutator enzyme is provided by work with a
prokaryotic DNA methyltransferase under S-adenosyl-methionine methyl- donor
limiting conditions. Methyl-donor limiting conditions might arise in early
stages of tumor development, leading to high rates of
methyltransferase-mediated CpG mutagenesis, as seen in human tumors. Such a
mechanism is consistent with the frequently reported methionine auxotrophy
of cancer cells and with the tumorigenic effects of methyl- deficient
diets. Methyl deficiency in tumor cells is also consistent with the
commonly observed global hypomethylation of tumor cell DNA, despite normal
or even high levels of DNA methyltransferase expression.
REVIEWS
DNA methylation and cancer
Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge 02142.
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