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 multiple endocrine neoplasia that is characterized by hyperparathyroidism and multiple endocrine tumors and that has_material_basis_in mutations in the CDKN1B gene on chromosome 12p13 resulting in a reduction in the amount of functional p27 tumor suppressor protein which allows cells to grow and divide unchecked. (DO)