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 multiple mitochondrial dysfunctions syndrome that is characterized by normal development for the first months of life, followed by progressive loss of motor and social skills with hypotonia, spasticity, and nystagmus, resulting in death in early childhood, and has_material_basis_in autosomal recessive inheritance of homozygous or compound heterozygous mutation in the iron-sulfur cluster assembly 2 gene on chromosome 14q24. (DO)