The syndrome of dystonia‐parkinsonism can be acquired (medication‐induced, lesion‐associated, toxic, infectious, prion, autoimmune) and genetic (TAF1, PRKRA, ATP7B, GBA, HTT, SLC19A3, ATP1A3, KMT2B, PLA2G6, GCH1, PRNP, and mitochondrial disorders—many of which are associated with iron accumulation).10 This evidence concerns the gene GCH1 and Parkinson disease.