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The Capital Region of Denmark - a part of Copenhagen University Hospital
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A Novel TTBK2 De Novo Mutation in a Danish Family with Early-Onset Spinocerebellar Ataxia

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Spinocerebellar ataxia type 11 (SCA11) is rare and has previously been described in four families worldwide. We report a Danish family with onset of symptoms in early childhood and affected family members in two generations. The proband, a Danish female born in 1968, and family members were examined. Exome sequencing was performed and a "movement disorders" gene panel consisting of approximately 200 genes was used for filtering, while Sanger sequencing was used for subsequent testing for the mutation in the family. Onset of symptoms in affected family members was in early childhood. A novel frameshift mutation (c.1205_1207delinsA) in the tau-tubulin kinase 2 encoding gene, TTBK2, was identified, which was compatible with a diagnosis of SCA11. The mutation was subsequently identified in her two affected sons but not in the unaffected parents or her unaffected brother. This report further delineates the phenotypic spectrum of the rare SCA11 disease. In contrast to previously reported cases, onset of symptoms was in early childhood and the mutation was de novo in the proband.

Original languageEnglish
JournalCerebellum
Volume16
Issue number1
Pages (from-to)268-71
DOIs
Publication statusPublished - 2017

ID: 46437697