Analysis of whole-genome sequencing data from 5,315 Parkinson's disease patients and 36,902 controls found that rare variants in 44 dystonia-related genes do not significantly increase Parkinson's risk. While several genes including SQSTM1 and AOPEP showed nominal associations, none survived multiple testing correction. In early-onset Parkinson's cases, five genes reached statistical significance, but these signals were driven by very small numbers of variants and failed robustness testing. This challenges the hypothesis that shared genetic mechanisms substantially link dystonia and Parkinson's disease. The findings have important implications for understanding neurodegenerative disease overlap and genetic counseling approaches. While dystonia and Parkinson's frequently co-occur clinically, this suggests the relationship may be more complex than simple shared genetic vulnerability. The study's strength lies in its large sample size and comprehensive gene panel, though the focus on rare variants means common genetic factors remain unexplored. As a preprint awaiting peer review, these conclusions require independent validation. The results appear confirmatory rather than paradigm-shifting, supporting a more nuanced view of movement disorder genetics than previously assumed.