| Spinocerebellar ataxia type 31 (SCA31) is a very rare disease with manifestation of late-onset of cerebral ataxia, dysarthria, and horizontal gaze nystagmus, and that is occasionally accompanied by pyramidal signs, tremor, decreased vibration sense, and hearing difficulties. The mean age of disease onset is 58 years but it can present between the ages of 8 to 83 years. SCA31 is due to non-coding pentanucleotide repeat expansions in the brain expressed, associated with NEDD4, 1 (BEAN1) gene (16q21). Inherited autosomal dominantly with incomplete penetrance. |
