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.
An autosomal recessive intellectual developmental disorder that is characterized by intellectual impairment, macrocephaly, and dysmorphic features and that has_material_basis_in homozygous mutation in the APC2 gene on chromosome 19p13. Epilepsy with eyelid myoclonus has also been reported. (DO)