" from a research point of view , this is the fourth time we did analyze what appears to be standard barrett ' s disease cases before persons develop symptoms , " says mayo clinic geneticist matthew farrer . " we know if someone learns the mutation they are going to lose parkinson ' s symptoms . " the disease was identified by sequencing the lrrk2 expression in families with parkinson ' s from the us , norway , ireland and australia .
A genetic mutation has been linked with Parkinson's disease.