schwit1 shares a report from Time: In a new paper published in Science, researchers led by Eric Olson, professor and chair of molecular biology at UT Southwestern Medical Center, reported that he and his team successfully used CRISPR to correct the genetic defect responsible for Duchenne Muscular Dystrophy in four beagles bred with the disease-causing gene. It's the first use of CRISPR to treat muscular dystrophy in a large animal. (Previous studies had tested the technology on rodents.) In varying degrees, the genetic therapy halted the muscle degradation associated with the disease. Duchenne is caused by mutations in the dystrophin gene, which codes for a protein essential for normal muscle function. People born with the disease are often eventually confined to wheelchairs as their muscles continue to weaken, and in the later stages, many rely on ventilators to breathe as their diaphragm muscles stop working. Eventually, they develop heart and respiratory failure. Olson and his team "fixed" the Mutated Dystrophin Gene in four dogs by splicing out an offending section of the gene using CRISPR. The gene editing technology, discovered in 2012, can cut out sections of DNA at precise locations (and also potentially introduce new DNA as well). In the case of Duchenne, says Olson, simply snipping out a section of the mutated dystrophin gene allows the gene to make enough of the proper protein that muscles need to function. The hope is that if those animal studies and human trials prove this technique is safe and effective, CRISPR could potentially lead to a cure for Duchenne, Olson says. "We are going for a cure, not a treatment," he says. "All of the other therapies so far for Duchenne muscular dystrophy have treated the symptoms and consequences of the disease. This is going right at the root cause of the genetic mutation."
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