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Newly found enzymes may play early role in cancer
Date:12/24/2008

n. Defects in DNA methylation balance are strongly associated with the early development of cancer, other diseases and birth defects, and the scientists say their study is the first clear evidence that this enzyme system plays a critical role in maintaining this balance. They also believe it's a process that can be reversed.

Further research will reveal if DNA methylation levels can be manipulated genetically. If so, it could lead to drugs to reactivate particular genes and suppress tumor growth. Remarkably, this system also helps protect the genome from mutations.

"We discovered a pair of enzymes that can remove methylated DNA, but if these enzymes work improperly, they will instead enhance the rate of mutations in methylated DNA and cause cancer progression," says Jones. "The question now is, when they work improperly, can we find ways to shut them off and prevent these mutations?"

The enzymes leading to DNA demethylation involve the coupling of a 5-meC deaminase enzyme, a G:T glycosylase enzyme and Gadd45, which is not an enzyme.


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Contact: Linda Aagard
linda.aagard@hci.utah.edu
801-587-7639
University of Utah
Source:Eurekalert

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