Test Details: SCA2 is an autosomal dominant ataxia which is a unique form of cerebellar degenerative disease seen in a wide age range from 2 to 65 years. The symptoms are similar to SCA1 but in addition, the patient also has optic disc pallor, retinal degeneration & Parkinsonian rigidity. In SCA 2 there is an expansion in CAG trinucleotide repeat in chromosome 12q which results in abnormal Ataxin-2 protein production.