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Autosomal Dominant Spinocerebellar Ataxias and Episodic Ataxias

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Handbook of the Cerebellum and Cerebellar Disorders

Abstract

Hereditary autosomal dominant spinocerebellar ataxias (ADCAs) are a clinically and genetically heterogeneous group of disorders consisting of 31 spinocerebellar ataxia syndromes (SCAs), dentatorubral-pallidoluysian atrophy (DRPLA), and 7 episodic ataxia syndromes (EAs). SCAs are characterized by disequilibrium, slowly progressive incoordination (ataxia) of gait and limbs, dysarthria, and/or oculomotor disorder due to cerebellar degeneration in the absence of coexisting diseases. The degenerative process can be limited to the cerebellum (ADCA type III) or may additionally involve the retina (ADCA type II), optic nerve, pontomedullary systems, basal ganglia, cerebral cortex, spinal tracts, or peripheral nerves (ADCA type I and DRPLA). In EAs, the disease presents with recurrent, discrete episodes of ataxia, giddiness, and vertigo with or without interictal abnormalities. Prevalence of ADCAs has been estimated between 0.8 and 3.5:100,000. Onset is usually between ages 30 and 50 years, although early onset in childhood and later onset after the age of 60 years can be observed. Genetic classification includes 31 SCA loci (SCA1-SCA36, numbered in the order of locus or gene description) with 20 genes identified, DRPLA, and 7 EA loci (EA1-7) with 4 genes identified. Twelve ADCAs are caused by dynamic expansions of polyglutamine-encoding CAG repeats (SCA1-3, 6, 7, 17, and DRPLA) or repeats falling outside the coding region (SCA8, 10, 12, 31, and 36). In these conditions, repeat size influences disease progression and severity, while its variability is responsible for variability in age of onset, with larger repeats in early onset cases. Additionally, instability of expanded alleles leads to the phenomenon of anticipation (earlier onset and more severe disease in successive generations). All other ADCAs are caused by conventional mutations in genes with distinct functions. The clinical phenotypes of the most common forms have been firmly established. Genetic testing enables identification of the causative gene in 50–60% of ADCA cases. Despite the large number of pathogenic studies, effective therapies are still lacking. Current treatment is only symptomatic and management of ataxia relies on physiotherapy.

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Authors and Affiliations

  1. Fondazione IRCCS Istituto Neurologico C., Milan, Italy

    Franco Taroni

  2. Department of Diagnostics and Applied Technology, Unit of Genetics of Neurodegenerative and Metabolic Diseases Istituto Neurologico “Carlo Besta”, Milan, Italy

    Franco Taroni

  3. Unit of Neuroradiology, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy

    Luisa Chiapparini

  4. Department of Diagnostics and Applied Technology, Unit of Genetics of Neurodegenerative and Metabolic Disease, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy

    Caterina Mariotti

Authors
  1. Franco Taroni
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  2. Luisa Chiapparini
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  3. Caterina Mariotti
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Corresponding author

Correspondence to Franco Taroni .

Editor information

Editors and Affiliations

  1. CHU-Charleroi, University of Mons, Charleroi, Belgium

    Mario U. Manto

  2. Department of Neuroscience, The Scripps Research Institute, La Jolla, CA, USA

    Donna L. Gruol

  3. Ataxia Center, Laboratory for Neuroanatomy and Cerebellar Neurobiology, Department of Neurology Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA

    Jeremy D. Schmahmann

  4. Department of Integrative Physiology, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan

    Noriyuki Koibuchi

  5. Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA

    Roy V. Sillitoe

Section Editor information

  1. Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

    Jeremy D. Schmahmann

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Taroni, F., Chiapparini, L., Mariotti, C. (2022). Autosomal Dominant Spinocerebellar Ataxias and Episodic Ataxias. In: Manto, M.U., Gruol, D.L., Schmahmann, J.D., Koibuchi, N., Sillitoe, R.V. (eds) Handbook of the Cerebellum and Cerebellar Disorders. Springer, Cham. https://doi.org/10.1007/978-3-030-23810-0_101

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