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New compound holds promise for treating Duchenne MD, other inherited diseases
Date:6/27/2012

Scientists at UCLA have identified a new compound that could treat certain types of genetic disorders in muscles. It is a big first step in what they hope will lead to human clinical trials for Duchenne muscular dystrophy.

Duchenne muscular dystrophy, or DMD, is a degenerative muscle disease that affects boys almost exclusively. It involves the progressive degeneration of voluntary and cardiac muscles, severely limiting the life span of sufferers.

In a new study, senior author Carmen Bertoni, an assistant professor in the UCLA Department of Neurology, first author Refik Kayali, a postgraduate fellow in Bertoni's lab, and their colleagues demonstrate the efficacy of a new compound known as RTC13, which suppresses so-called "nonsense" mutations in a mouse model of DMD.

The findings appear in the current online edition of the journal Human Molecular Genetics.

"We are excited about these new findings because they represent a major step toward the development of a drug that could potentially treat this devastating disease in humans," Bertoni said. "We knew that the compounds were effective in cells isolated from the mouse model for DMD, but we did not know how they would behave when administered in a living organism."

Nonsense mutations are generally caused by a single change in DNA that disrupts the normal cascade of events that changes a gene into messenger RNA, then into a protein. The result is a non-functioning protein. Approximately 13 percent of genetic defects known to cause diseases are due to such mutations. In the case of DMD, the "missing" protein is called dystrophin.

For the study, Bertoni and Kayali collaborated with the laboratory of Dr. Richard Gatti, a professor of pathology and laboratory medicine and of human genetics at UCLA. Working with the UCLA Molecular Shared Screening Resource facility at the campus's California NanoSystems Institute, the Gatti lab screened some 35,000
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Contact: Mark Wheeler
mwheeler@mednet.ucla.edu
310-794-2265
University of California - Los Angeles
Source:Eurekalert

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