RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A dystonia that initially involves the distal limbs and later involves the neck, orofacial, and craniocervical regions, and has_material_basis_in autosomal recessive inheritance of homozygous or compound heterozygous mutation in the hippocalcin (HPCA) gene on chromosome 1p35. (DO)