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Work with fungus uncovering keys to DNA methylation
Date:12/15/2008

Researchers in a University of Oregon lab have shed more light on the mechanism that regulates DNA methylation, a fundamental biological process in which a methyl group is attached to DNA, the genetic material in cells of living organisms.

DNA methylation is essential for normal growth and development in plants and animals. It has been implicated in long-term memory, and irregularities in its process are associated with diseases such as cancer.

In the UO's Institute of Molecular Biology, Eric U. Selker and members of his laboratory use a quickly reproducing and easy-to-manipulate fungus, Neurospora crassa, to explore the control of DNA methylation. Neurospora is considered the simplest model organism for such research.

Reporting in the Dec. 15 issue of the journal Genes & Development, Selker and Keyur K. Adhvaryu, a postdoctoral researcher in the Selker lab, document that the enzyme protein phosphatase PP1 is necessary for normal methylation of DNA.

In the nucleus of eukaryotic cells, DNA is wrapped around histone proteins to form chromatin, and one histone, H3, turns out to be critical for DNA methylation. "It was long thought that histones were simply structural proteins, but we are learning that these proteins are also informational," Selker said.

This was demonstrated in the journal Nature in 2001 by Selker and his former postdoctoral research associate Hisashi Tamaru. They found that a protein required for DNA methylation, DIM-5, is an enzyme that adds a methyl group onto lysine 9 of histone H3. "This was the first solid indication that chromatin is important for DNA methylation," Selker said.

The new paper by Adhvaryu and Selker shows that PP1 is important to remove phosphates attached to serine 10 of H3, the site immediately adjacent to the site that DIM-5 needs to methylate, leading to DNA methylation.

In an accompanying article in the same issue of Genes & Development, Wolfg
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Contact: Jim Barlow
jebarlow@uoregon.edu
541-346-3481
University of Oregon
Source:Eurekalert  

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