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 combined T cell and B cell immunodeficiency characterized by recurrent upper and lower respiratory infections, increase in the CD4+ T cell to CD8+ T cell ratio, impaired T-cell proliferative responses to multiple antigens, and impaired ability to produce specific immunoglobulins that has_material_basis_in homozygous or compound heterozygous mutation in RELB on chromosome 19q13.32. (DO)