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 lymphoproliferative syndrome characterized by autosomal recessive inheritance, persistent symptomatic Epstein-Barr virus-associated viremia, hypogammaglobulinemia, and impairment in specific antibody function and that has_material_basis_in homozygous mutation in the CD27 gene on chromosome 12p13. (DO)