OBSOLETE: CLN4A disease

CLN4A disease (Orphanet code 228340) is an obsolete disease designation that was previously used to describe a form of neuronal ceroid lipofuscinosis (NCL), specifically adult-onset autosomal dominant Kufs disease type A. This entry has been reclassified and merged into the broader category of CLN4 disease or adult-onset neuronal ceroid lipofuscinosis. The neuronal ceroid lipofuscinoses are a group of inherited neurodegenerative lysosomal storage disorders characterized by the accumulation of autofluorescent lipopigment (ceroid-lipofuscin) in neurons and other cell types. The condition historically designated as CLN4A was associated with progressive myoclonus epilepsy as the predominant feature, along with cognitive decline, cerebellar ataxia, and motor deterioration. It primarily affects the central nervous system, leading to progressive neurological deterioration in adulthood. CLN4 disease is caused by mutations in the DNAJC5 gene (also known as CSPα), which encodes cysteine string protein alpha, important for synaptic vesicle function. The inheritance pattern is autosomal dominant, distinguishing it from most other forms of NCL which are autosomal recessive. As this is an obsolete entry, patients and clinicians should refer to the current classification of CLN4 disease (adult-onset neuronal ceroid lipofuscinosis, Kufs disease type A) for up-to-date information. There is currently no cure or disease-modifying treatment available; management is symptomatic and supportive, focusing on seizure control with antiepileptic medications and multidisciplinary care for progressive neurological symptoms.

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