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 hypomyelinating leukodystrophy characterized by progressive loss of developmental milestones starting at about 12 to 16 months of age after normal early development that has_material_basis_in homozygous or compound heterozygous mutation in CNP on chromosome 17q21.2. (DO)