Patients with inflammatory bowel disease (IBD), Crohn’s disease (CD), and ulcerative colitis (UC) have been shown to be at up to a 40% increased risk of developing Parkinson’s disease (PD), a progressive neurodegenerative disorder. Even though a genetic link between IBD and PD was established through shared causal mutations in the LRRK2 gene, it cannot fully explain the observed comorbidity. The goal of this study was to further explore the genetic overlap between these two diseases.