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.
This is a primarily fibrotic disease affecting the liver, kidney, and heart. Affected individuals develop degenerative hepatic fibrosis in childhood or early adulthood, with later onset of fibrocystic kidney disease and hypertrophic cardiomyopathy.