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Study provides first link between 2 major Parkinson's genes
Date:4/4/2011

As Parkinson's Awareness Month gets underway, a Canadian-led international study is providing important new insight into Parkinson's disease and paving the way for new avenues for clinical trials. The study, led by Dr. Michael Schlossmacher in Ottawa, provides the first link between the most common genetic risk factor for Parkinson's and the hallmark accumulation of a protein called alpha-synuclein within the brains of people with Parkinson's. It is published in the most recent edition of the journal Annals of Neurology.

"This study addresses a major riddle in Parkinson's disease," explains Dr. Schlossmacher, who holds the Canada Research Chair in Parkinson's disease at the Ottawa Hospital Research Institute and the University of Ottawa, and is also an active neurologist at The Ottawa Hospital. "Thanks to pioneering research done by geneticists in the United States and Israel, we've known for six years now that 10-12 per cent of people with Parkinson's have a mutation in one copy of a gene called glucocerebrosidase, or GBA. However, until now we have not understood how these mutations contribute to the disease and how they fit with other pieces of the puzzle, such as the accumulation of alpha-synuclein in the brain."

Alpha-synuclein has been likened to the "bad cholesterol" of Parkinson's because it gradually accumulates in the brain as Parkinson's progresses. Affected brain cells show signs of injury, and when they die, this leads to the tremors, stiffness and slowness that are typically associated with Parkinson's disease.

Using a series of experimental laboratory models, Dr. Schlossmacher and his colleagues have now shown that the GBA mutations found in Parkinson's patients prevent brain cells from efficiently breaking down and removing alpha-synuclein.

"While the GBA mutations don't cause Parkinson's disease on their own, they do significantly increase the risk of developing the disease, probably by making people
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Contact: Jennifer Paterson
jpaterson@ohri.ca
613-798-5555 x73325
Ottawa Hospital Research Institute
Source:Eurekalert

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