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 infantile onset of motor delay and difficulties walking due to spasticity of the lower limbs that has_material_basis_in compound heterozygous mutation in the MARS1 gene on chromosome 12q13.3. (DO)