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New mouse model reveals a mystery of Duchenne muscular dystrophy, Stanford scientists say
Date:7/7/2013

STANFORD, Calif. Children with Duchenne muscular dystrophy often die as young adults from heart and breathing complications. However, scientists have been puzzled for decades by the fact that laboratory mice bearing the same genetic mutation responsible for the disease in humans display only mild symptoms and no cardiac involvement.

Now, researchers at the Stanford University School of Medicine have developed a mouse model that accurately mimics the course of the disease in humans. The study is the first to demonstrate a molecular basis for the cardiac defect that is the primary killer of people with Duchenne muscular dystrophy. Furthermore, the study provides evidence for a potential treatment to help prolong heart function. The mouse model also will allow researchers and clinicians to test a variety of therapies for the inherited condition.

"Until now, scientists had no animal model of Duchenne muscular dystrophy that manifests the symptoms of the cardiac disease that kills children and young adults with the condition," said Helen Blau, PhD, the Donald E. and Delia B. Baxter Professor at Stanford and director of the Baxter Laboratory for Stem Cell Biology. "This has been a conundrum for three decades. We found that mice with moderately shortened telomeres and the Duchenne mutation exhibit profound cardiac defects and die at a young age, just like human patients."

Blau, who is also a member of the Stanford University Institute for Stem Cell Biology and Regenerative Medicine and a professor of microbiology and immunology, is the senior author of the study, which will be published July 7 in Nature Cell Biology. Foteini Mourkioti, PhD, an instructor at the Baxter Laboratory, is the lead author of the study.

The investigators found that the reason humans suffer more serious symptoms than mice has to do with the length of the protective caps, called telomeres, on the ends of chromosomes: Mice have telomeres about 40 kilo
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Contact: Krista Conger
kristac@stanford.edu
650-725-5371
Stanford University Medical Center
Source:Eurekalert

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