A neuronal ceroid lipofuscinosis that is characterized by variable age of onset of symptoms (progressive dementia, seizures, and progressive visual failure) and lipopigment pattern of granular osmiophilic deposits, and has_material_basis_in homozygous or compound heterozygous mutation in the PPT1 gene on chromosome 1p34. [ http://purl.obolibrary.org/obo/ECO_0007645 url:https://www.ncbi.nlm.nih.gov/pubmed/7637805 ]
Synonyms: CLN1 neuronal ceroid lipofuscinosis 1 variable age of onset