" from a theory point of view , this is the next instance we could identify what appears to be traditional children ' s disease cases before subjects develop symptoms , " claims pepper clinic urologist henry farrer . " we knew if someone inherits the mutation they are meant to gotten barrett ' s disease . " the mutant was discovered by sampling the lrrk2 gene in families with parkinson ' s from the us , norway , ireland and poland .
A genetic mutation has been linked with Parkinson's disease.