A Answers (1)
Rarely, several members in a family develop Parkinson's disease (PD). In these families, we have been able on occasion to identify typographical errors in the genetic code (DNA mutations) that are the cause of the disease. However, these mutations are typically very rare in the general population. Generally, if you have a first-degree relative with PD (parent or sibling or child), your risk is doubled. However, that still constitutes only a 4% lifetime risk for PD.