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Clinical and genetic analysis of three German kindreds with autosomal dominant cerebellar ataxia type I linked to the SCA2 locus

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Abstract

The detailed clinical, electrophysiological and imaging data of three German autosomal dominant cerebellar ataxia (ADCA) families are reported. Linkage to SCA2 was established using microsatellite markers D12S105, D12S1339(1328), D12S 1340(1329) yielding a lod score exceeding +3.0 for the combined data. Analysis of the pedigree data provided evidence of anticipation as observed in other neurodegenerative disorders due to polyglutamine expansion encoded by a CAG repeat. This hypothesis was confirmed by the detection of the SCA2-specific pathological protein using the 1C2 monoclonal antibody which selectively recognizes large polyglutamine expansions and the characterization of a CAG expansion in the patients. Clinically, the families were characterized by progressive ataxia of stance, gait and limbs. Saccade velocity was markedly reduced in SCA2. Further oculomotor findings were gaze palsy, impaired smooth pursuit and reduced optokinetic reflex. Dementia and pyramidal tract signs were rather rare, while peripheral involvement (reduced or absent ankle reflexes, fasciculation-like movements, amyotrophy) was a prominent feature. Electrophysiological investigations provided evidence of sensory neuropathy of the axonal type and degeneration of the posterior columns. Imaging studies demonstrated severe shrinkage of brain-stem structures even in early stages of the disease.

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Authors and Affiliations

  1. Department of Neurology, University of Tübingen, Hoppe-Seyler-Strasse 3, D-72076, Tübingen, Germany

    K. Bürk, M. Abele, J. Dichgans & T. Klockgether

  2. Department of Neuroradiology, University of Tübingen, Tübingen, Germany

    M. Skalej & A. Brice

  3. Inserm U 289, Mécanismes et Conséquences de la Mort Neuronale, Hôpital de la Salpêtrière, Paris, France

    G. Stevanin, O. Didierjean & G. Cancel

  4. Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Illkirch, France

    Y. Trottier

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  1. K. Bürk
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  2. G. Stevanin
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  3. O. Didierjean
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  4. G. Cancel
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  5. Y. Trottier
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  6. M. Skalej
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  7. M. Abele
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  8. A. Brice
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  9. J. Dichgans
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  10. T. Klockgether
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Bürk, K., Stevanin, G., Didierjean, O. et al. Clinical and genetic analysis of three German kindreds with autosomal dominant cerebellar ataxia type I linked to the SCA2 locus. J Neurol 244, 256–261 (1997). https://doi.org/10.1007/s004150050081

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  • DOI: https://doi.org/10.1007/s004150050081

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