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Mitochondrial dysfunction has been implicated in the pathogenesis of sporadic, idiopathic Parkinson disease. In some cases, mitochondrial DNA primary genetic abnormalities, or more commonly, secondary rearrangements due to polymerase gamma (POLG1) gene mutation, can directly cause parkinsonism. The case of a Parkinson disease patient with some signs or symptoms suggestive of mitochondrial disease...
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