The SCA12 Mutation as a Rare Cause of Spinocerebellar Ataxia

Abstract
THE SPINOCEREBELLAR ataxias (SCAs) are a heterogeneous group of inherited neurodegenerative disorders that primarily affect the cerebellum, brainstem, and spinal tracts.1 At least 13 genetic loci and 7 different SCA genes have been identified. SCA1, SCA2, SCA3/MJD, SCA6, and SCA7 are caused by expansions of CAG nucleotide repeats in coding regions of the corresponding genes.2 However, the genetic defect underlying a significant subset of SCAs remains to be elucidated.