Mondo Description Dopa responsive dystonia (DRD) due to sepiapterin reductase deficiency (SRD) is a very rare neurometabolic disorder characterized by dystonia with diurnal fluctuations, axial hypotonia, oculogyric crises, and delays in motor and cognitive development.

Uniprot Description A form of DOPA-responsive dystonia. In the majority of cases, patients manifest progressive psychomotor retardation, dystonia and spasticity. Cognitive anomalies are also often present. The disease is due to severe dopamine and serotonin deficiencies in the central nervous system caused by a defect in BH4 synthesis. Dystonia is defined by the presence of sustained involuntary muscle contractions, often leading to abnormal postures.

Disease Ontology Description A dystonia characterized by sustained muscle contractions with diurnal fluctuations, axial hypotonia, oculogyric crises, delays in motor and cognitive development and severe dopamine and serotonin deficiencies that has_material_basis_in mutation in the SPR gene on chromosome 2p resulting in sepiapterin reductase deficiency.