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 neuronal ceroid lipofuscinosis that is characterized by a late infantile onset of symptoms (seizures or motor impairment followed by mental regression, myoclonus, speech impairment, loss of vision, and personality disorders) and a mixed combination of 'granular,' 'curvilinear,' and 'fingerprint' profile lipopigment patterns and has_material_basis_in homozygous or compound heterozygous mutation in the CLN8 gene on chromosome 8p23. (DO)