LRRK2 and Crohn disease: Coding variants in LRRK2 can cause monogenic Parkinson’s disease (PD), and coding and non-coding variants in LRRK2 are associated with increased risk for developing sporadic PD and Crohn’s disease (Blauwendraat et al., 2020; Hui et al., 2018; Kluss et al., 2019).