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Mutations in DNMT1 cause autosomal dominant cerebellar ataxia, deafness and narcolepsy

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  • Juliane Winkelmann
  • Ling Lin
  • Barbara Schormair
  • Birgitte Rahbek Kornum
  • Juliette Faraco
  • Giuseppe Plazzi
  • Atle Melberg
  • Ferdinando Cornelio
  • Alexander E Urban
  • Fabio Pizza
  • Francesca Poli
  • Fabian Grubert
  • Thomas Wieland
  • Elisabeth Graf
  • Joachim Hallmayer
  • Tim M Strom
  • Emmanuel Mignot
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Autosomal dominant cerebellar ataxia, deafness and narcolepsy (ADCA-DN) is characterized by late onset (30-40 years old) cerebellar ataxia, sensory neuronal deafness, narcolepsy-cataplexy and dementia. We performed exome sequencing in five individuals from three ADCA-DN kindreds and identified DNMT1 as the only gene with mutations found in all five affected individuals. Sanger sequencing confirmed the de novo mutation p.Ala570Val in one family, and showed co-segregation of p.Val606Phe and p.Ala570Val, with the ADCA-DN phenotype, in two other kindreds. An additional ADCA-DN kindred with a p.GLY605Ala mutation was subsequently identified. Narcolepsy and deafness were the first symptoms to appear in all pedigrees, followed by ataxia. DNMT1 is a widely expressed DNA methyltransferase maintaining methylation patterns in development, and mediating transcriptional repression by direct binding to HDAC2. It is also highly expressed in immune cells and required for the differentiation of CD4+ into T regulatory cells. Mutations in exon 20 of this gene were recently reported to cause hereditary sensory neuropathy with dementia and hearing loss (HSAN1). Our mutations are all located in exon 21 and in very close spatial proximity, suggesting distinct phenotypes depending on mutation location within this gene.

Original languageEnglish
JournalHuman Molecular Genetics
Volume21
Issue number10
Pages (from-to)2205-10
Number of pages6
ISSN0964-6906
DOIs
Publication statusPublished - 15 May 2012

    Research areas

  • Amino Acid Sequence, Cerebellar Ataxia, DNA (Cytosine-5-)-Methyltransferase, Deafness, Exome, Exons, Genes, Dominant, Humans, Molecular Sequence Data, Mutation, Narcolepsy, Pedigree, Phenotype

ID: 45267026