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 retinitis pigmentosa characterized by onset of night blindness between ages 3 and 4 years and complete blindness as early as age 7 that has_material_basis_in homozygous or compound heterozygous mutation in the DHX38 gene on chromosome 16q22.2. (DO)