PRKN and Parkinson disease: The E3‐ubiquitin ligase Parkin associated with familial PD is regulated by miR‐181a in ageing muscles, miR‐103a‐3p levels are increased in an in vitro and in vivo MPTP model of Parkinson's disease, miR‐146a levels are up‐regulated in a rotenone neurodegeneration model, and miR‐218 expression is increased in HEK293 cells.60, 61, 62, 63, 64