CLN8 disease

What it is

A rare neuronal ceroid lipofuscinosis characterized classically by late infantile-onset (5-10 years) with rapid disease progression, myoclonus, visual loss and progressive intellectual disability (commonly observed within 2-5 years of seizure onset). Spasticity, dystonic posturing, tremors, and other extrapyramidal signs are also reported in these patients. Less frequently, the disease can manifest with intractable tonic-clonic or complex partial seizures without myoclonous, progressive intellectual disability and variable visual deficit, blindness being infrequent. This condition, also known as Northern epilepsy, is milder and slow progressing compared to the classical form of the disease.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Infancy

Inheritance

Autosomal recessive

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Genes reported in subtypes

Orphanet records this gene on 2 more specific entries under this disorder, not on this entry itself:

A well-studied disease is usually split into subtypes, and the gene is curated on whichever one the evidence belongs to. Open a subtype to see which gene goes with it.

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references