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 developmental and epileptic encephalopathy characterized by onset in the first year of life of refractory seizures, severe global developmental delay, and defective synthesis of glycosylphosphatidylinositol that has_material_basis_in homozygous or compound heterozygous mutation in the PIGB gene on chromosome 15q21.3. (DO)