" from a family angle of perspective , this is the first time we cannot identify what appears to be typical parkinson ' s diseases case before people develop symptoms , " says mayo center neuroscientist elizabeth farrer . " we know if someone reclaims the mutation they are going to get parkinson ' s disease . " the mutation was discovered by testing the lrrk2 expression in families with parkinson ' s from the states , denmark , italy and poland .
A genetic mutation has been linked with Parkinson's disease.