" from a research point of view , this is the sixth time we could identify what appears to be typical parkinson ' s disease symptoms before people acquire it , " says mayo hospital biochemist tom farrer . " we know if someone marries the mutation they are going to get parkinson ' s illness . " the protein was detected by sequence the lrrk2 gene in families with parkinson ' s from the we , norway , finland and sweden .
A genetic mutation has been linked with Parkinson's disease.