" from a theoretical point of view , this is the first time we could identify what seems to be average parkinson ' s symptoms cases before people develops symptoms , " asserts mayo department neuroscientist matthew farrer . " we know if someone inherits the mutation they are gonna to produce parkinson ' s disease . " the mutation was discovered by sequencing the lrrk2 protein in families with parkinson ' s from the us , ireland , norway and poland .
A genetic mutation has been linked with Parkinson's disease.