" from a research point of vision , this is the initial time we couldn distinguish whether tends to be characteristic parkinson ' s disease episodes before we developed symptoms , " argues mayo clinic psychologist patrick philipps . " we know if someone inherits the parkinson they are going to get parkinson ' s disease . " the mutation was found by detecting the lrrk2 gene in couples with sp ' s from the netherlands , norway , ireland and australia .
a genetic error has been linked with parkinson ' s pd .