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 patterned macular dystrophy characterized by bilateral accumulation of pigmented or yellowish material at the level of the retinal pigment epithelium in lesions that resemble the wings of a butterfly that has_material_basis_in heterozygous mutation in the PRPH2 gene on chromosome 6p21. (DO)