title: Severe symptoms of 16q-ADCA coexisting with SCA8 repeat expansion.
abstract: We report a family with 16q-ADCA(16q 22.1 linked autosomal dominant cerebellar ataxia) coexisting with SCA8 repeat expansion. The brothers in this family presented with pyramidal signs, tremor, myoclonus and mental retardation in addition to cerebellar symptom in childhood. They showed both C-to-T substitution puratrophin-1 gene and an expanded allele of the SCA8 gene in the brothers and their father. These siblings presented with atypical symptoms and early onset age as16q-ADCA. Although it remains controversial whether the expanded SCA8 allele is associated with cerebellar symptoms, the coexistence of SCA8 repeat expansion with SCA6 was reported previously. Pure or predominant cerebellar symptoms were found in patients with SCA8, SCA6 and 16q-ADCA. In addition, common findings in neuropathology of SCA8, SCA6 and 16q-ADCA have been reported. We suppose that coexistence of SCA8 repeat expansion with 16q-ADCA may be involved in the pathogenesis and severe symptoms in this family.
authors.affiliation: Department of Neurology, University of Occupational and Environmental Health, School of Medicine, Yahatanishi-ku, Kitakyushu, 807-8555, Japan. keiko-o@med.uoeh-u.ac.jp
authors.forename: Keiko
authors.initials: K
authors.lastname: Ohnari
authors.forename: Masashi
authors.initials: M
authors.lastname: Aoki
authors.forename: Takenori
authors.initials: T
authors.lastname: Uozumi
authors.forename: Sadatoshi
authors.initials: S
authors.lastname: Tsuji
mesh_terms: D000328:Adult; D002524:Cerebellar Ataxia / Q000235:genetics* / Q000473:pathology; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics*; D004252:DNA Mutational Analysis; D005192:Family Health; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000235:genetics*; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated; D012720:Severity of Illness Index; D019680:Trinucleotide Repeat Expansion
chemical_list: C415906:ATXN8OS gene product, human; D009419:Nerve Tissue Proteins; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated