Apply the full DBS candidacy checklist before referring for neurosurgery: levodopa responsiveness, absence of dementia, and disabling fluctuations that cannot be controlled medically are all required criteria. Consider genetic testing in young-onset PD to identify PARK2 or PARK1 mutations that carry specific family counseling and prognostic implications.

That said, genetics definitely play a role, as first-degree relatives of an affected person face up to a two-fold increased risk of developing the condition themselves; Best candidates are individuals with idiopathic Parkinson's disease who have demonstrated that they are clearly levodopa-responsive; Most common cause is a mutation in the parkin gene, also known as P-A-R-K-two, which leads to a critical loss of E-three ubiquitin ligase activity; Standard neurosurgical targets for electrode placement include the thalamus, the globus pallidus internus, and the subthalamic nucleus; While other mutations have been mapped, parkin remains the most frequent hereditary culprit