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 cystic kidney disease characterized by nonsyndromic diffuse cystic dysplasia of the kidneys that has_material_basis_in heterozygous mutation in the BICC1 gene on chromosome 10q21.1. The same mutation maybe found in unaffected parents suggesting incomplete penetrance of the disorder or that additional environmental factors are required for development of the disorder. (DO)