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 autosomal recessive inheritance of progressive postnatal microcephaly, severely delayed psychomotor development and hypomyelination that has_material_basis_in homozygous mutation in the PYCR2 gene on chromosome 1q42. (DO)