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 familial nephrotic syndrome characterized by onset of proteinuria in the first or second decade of life, mesangial hypercellularity, focal segmental glomerulosclerosis, and effacement of podocyte foot processes that has_material_basis_in homozygous or compound heterozygous mutation in the KIRREL1 gene on chromosome 1q23.1. (DO)