For instance, Segawa syndrome or GCH1‐associated dopa‐responsive dystonia (DRD), is exquisitely responsive to low doses of levodopa, copper chelation therapy can improve the dystonia associated with Wilson's disease caused by biallelic variants in ATP7B, and deep brain stimulation can be highly effective in TOR1A‐associated dystonia.5 This evidence concerns the gene GCH1 and dystonia 5.