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 syndromic intellectual disability characterized by developmental delay and intellectual disability with many patients also displaying infantile hypotonia and autistic features that has_material_basis_in compound heterozygous or homozygous mutation in NRXN1 on chromosome 2p16.3. (DO)