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A quantum leap in gene therapy of Duchenne muscular dystrophy
Date:1/15/2013

COLUMBIA, Mo.-- Usually, results from a new study help scientists inch their way toward an answer whether they are battling a health problem or are on the verge of a technological breakthrough. Once in a while, those results give them a giant leap forward. In a preliminary study in a canine model of Duchenne muscular dystrophy (DMD), University of Missouri scientists showed exactly such a leap using gene therapy to treat muscular dystrophy. The results of the study will be published in the journal Molecular Therapy on Jan. 15, 2013.

Muscular dystrophy occurs when damaged muscle tissue is replaced with fibrous, bony or fatty tissue and loses function. Duchenne muscular dystrophy is the most common type of muscular dystrophy predominantly affecting boys. Patients with DMD have a gene mutation that disrupts the production of dystrophin, a protein essential for muscle cell survival and function. Absence of dystrophin starts a chain reaction that eventually leads to muscle cell degeneration and death. For years, scientists have been working to find the key to restoring dystrophin, but they have faced many challenges.

One of the largest hurdles in DMD gene therapy is the large size of the gene. Dystrophin is the largest gene in the human genome, containing approximately 4,000 amino acids. To fit the dystrophin gene into a vehicle that could deliver the gene to the appropriate site in the body, one has to delete 70 percent of the gene. The highly abbreviated gene is known as the "micro-dystrophin" gene. Previous studies suggest that micro-dystrophin can effectively stop muscle disease in mice that are missing dystrophin. However, mice that are missing dystrophin show minimal DMD symptoms, and results from mice often do not predict what will happen in humans. In contrast to mice, loss of dystrophin results in severe muscular dystrophy in dogs. If micro-dystrophin can work in dystrophic dogs, it will likely work in human patients. Unfortun
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Contact: Christian Basi
BasiC@missouri.edu
573-882-4430
University of Missouri-Columbia
Source:Eurekalert  

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