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 severe combined immunodeficiency that has_material_basis_in autosomal recessive mutations in the gene coding for T-cell surface glycoprotein CD3gamma chain precursors. Patients with CD3gamma deficiency have a severe defect in the expression of the T-cell receptor CD3-complex. Affected patients have decreased T-cell numbers and function; B cells are variably affected. (DO)