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 hereditary spastic paraplegia characterized by early childhood onset of global developmental delay and early-onset progressive spasticity mainly affecting the lower limbs but also affecting the upper lmbs that has_material_basis_in homozygous or compound heterozygous mutation in the ABHD16A gene on chromosome 6p21.33. (DO)