NCIt definition : A rare, autosomal dominant inherited progressive neurodegenerative disorder. It is
caused by a mutation in the ATN1 gene, resulting in a combined degeneration of the
dentatorubral and pallidoluysian systems. It can appear at any age, but it usually
affects individuals between 20 and 30 years and leads to death within 10-15 years.
The clinical presentation depends on the age of the affected individual; juvenile
patients develop severe progressive myoclonus epilepsy and cognitive decline, whereas
adult patients develop ataxia, choreoathetosis and dementia.;