" from a research point of vision , this is the one time we could distinguish what appears to be typical parkinson ' s disease instances before people develop symptoms , " says mayo clinic neuroscientist matthew sydenham . " we say if he inherits the variation they are going to become parkinson ' s disease . " the variation was recovered by investigating the lrrk2 gene in families with parkinson ' s from the us , finland , ireland and polish .
A genetic mutation has been linked with Parkinson's disease.