Dopa-responsive dystonia (DRD) describes a group of neurometabolic disorders characterized by dystonia that typically shows diurnal fluctuations, that responds excellently to levodopa (L-dopa) and that is comprised of autosomal dominant dopa-responsive dystonia (DYT5a), autosomal recessive dopa-responsive dystonia (DYT5b) and dopa responsive dystonia due to sepiapterin reductase (SR) deficiency. The disease is MONDO_0016812 (dopa-responsive dystonia). Also known as: DYT5 dystonia, HPD with diurnal fluctuation, Segawa's disease, hereditary progressive dystonia with diurnal fluctuation.