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 syndrome that is characterized by intrauterine growth retardation (IUGR), marked microcephaly, craniosynostosis, and severe malformation of the limbs, especially the arms and that has_material_basis_in homozygous mutation in the DONSON gene on chromosome 21q22. Biallelic mutation in the DONSON gene can also cause microcephaly, short stature, and limb abnormalities, a less severe disorder. (DO)