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Publication Detail
Mutations in GBA2 cause autosomal-recessive cerebellar ataxia with spasticity.
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Hammer MB, Eleuch-Fayache G, Schottlaender LV, Nehdi H, Gibbs JR, Arepalli SK, Chong SB, Hernandez DG, Sailer A, Liu G, Mistry PK, Cai H, Shrader G, Sassi C, Bouhlal Y, Houlden H, Hentati F, Amouri R, Singleton AB
  • Publication date:
    07/02/2013
  • Pagination:
    245, 251
  • Journal:
    Am J Hum Genet
  • Volume:
    92
  • Issue:
    2
  • Status:
    Published
  • Country:
    United States
  • PII:
    S0002-9297(12)00646-5
  • Language:
    eng
  • Keywords:
    Adolescent, Adult, Amino Acid Sequence, Base Sequence, Cerebellar Ataxia, Child, Child, Preschool, DNA Mutational Analysis, Family, Female, Genes, Recessive, Humans, Male, Molecular Sequence Data, Muscle Spasticity, Mutation, Pedigree, Tunisia, beta-Glucosidase
Abstract
Autosomal-recessive cerebellar ataxia (ARCA) comprises a large and heterogeneous group of neurodegenerative disorders with more than 20 different forms currently recognized, many of which are also associated with increased tone and some of which have limb spasticity. Gaucher disease is a lysosomal storage disease resulting from a defect in the enzyme acid β-glucosidase 1. β-glucosidase 2 is an enzyme with similar glucosylceramidase activity but to date has not been associated with a monogenic disorder. We studied four unrelated consanguineous families of Tunisian decent diagnosed with cerebellar ataxia of unknown origin. We performed homozygosity mapping and whole-exome sequencing in an attempt to identify the genetic origin of their disorder. We were able to identify mutations responsible for autosomal-recessive ataxia in these families within the gene encoding β-glucosidase 2, GBA2. Two nonsense mutations (c.363C>A [p.Tyr121(∗)] and c.1018C>T [p.Arg340(∗)]) and a substitution (c.2618G>A [p.Arg873His]) were identified, probably resulting in nonfunctional enzyme. This study suggests GBA2 mutations are a cause of recessive spastic ataxia and responsible for a form of glucosylceramide storage disease in humans.
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