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 serine deficiency that is characterized by multiple fatal malformations including ichthyosis, microcephaly, central nervous system abnormalities, limb deformities, intrauterine growth restriction, proptosis, anasarca, and micrognathia, and has_material_basis_in autosomal recessive inheritance of mutation in the PHGDH gene on chromosome 1p12, causing issues producing the amino acid serine. (DO)