" from a medical point of view , this is the first instance we could identifying how appearing to be classic barrett ' s system cases before children develop symptoms , " says mayo department neuroscientist tom farrer . " we suspect if somebody inherits the trait they are going to get parkinson ' s illness . " the mutation was discovered by refining the lrrk2 gene in parents with parkinson ' s from the us , norway , ireland and poland .
A genetic mutation has been linked with Parkinson's disease.