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  • Title: A 7.5-Mb duplication at chromosome 11q21-11q22.3 is associated with a novel spastic ataxia syndrome.
    Author: Johnson JO, Stevanin G, van de Leemput J, Hernandez DG, Arepalli S, Forlani S, Zonozi R, Gibbs JR, Brice A, Durr A, Singleton AB.
    Journal: Mov Disord; 2015 Feb; 30(2):262-6. PubMed ID: 25545641.
    Abstract:
    BACKGROUND: The autosomal dominant spinocerebellar ataxias are most commonly caused by nucleotide repeat expansions followed by base-pair changes in functionally important genes. Structural variation has recently been shown to underlie spinocerebellar ataxia types 15 and 20. METHODS: We applied single-nucleotide polymorphism (SNP) genotyping to determine whether structural variation causes spinocerebellar ataxia in a family from France. RESULTS: We identified an approximately 7.5-megabasepair duplication on chromosome 11q21-11q22.3 that segregates with disease. This duplication contains an estimated 44 genes. Duplications at this locus were not found in control individuals. CONCLUSIONS: We have identified a new spastic ataxia syndrome caused by a genomic duplication, which we have denoted as spinocerebellar ataxia type 39. Finding additional families with this phenotype will be important to identify the genetic lesion underlying disease.
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