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 gonadal dysgenesis that is characterized by progressive loss of primordial cells on the developing glands of an embryo, leading to extremely hypoplastic and dysfuctioning gonads resulting in one differentiated gonad and either a streak gonad or streak testis. (DO)