Identification of a Novel Homozygous SPG7 Mutation in a Japanese Patient with Spastic Ataxia: Making an Efficient Diagnosis Using Exome Sequencing for Autosomal Recessive Cerebellar Ataxia and Spastic Paraplegia

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Autosomal recessive cerebellar ataxias and autosomal recessive hereditary spastic paraplegias are clinically and genetically heterogeneous disorders with diverse neurological and non-neurological features. We herein describe a Japanese patient with a slowly progressive form of ataxia and spastic paraplegia. Using whole exome sequencing, we identified a novel homozygous frameshift mutation in SPG7, encoding paraplegin, in this patient. This is the first report of an SPG7 mutation in the Japanese population. For disorders previously undetected in a particular population, or unrecognized/atypical phenotypes, exome sequencing may facilitate molecular diagnosis.