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 facioscapulohumeral muscular dystrophy characterized by adult onset of progressive muscle weakness of the face and upper extremity muscles with disease progression that has_material_basis_in the combination of a heterozygous mutation in the DNMT3B gene on chromosome 20q11 and presence of a haplotype on chromosome 4 that is permissive for DUX4 expression. (DO)