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Rigshospitalet - a part of Copenhagen University Hospital
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DOORS syndrome and a recurrent truncating ATP6V1B2 variant

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  • Eliane Beauregard-Lacroix
  • Guillermo Pacheco-Cuellar
  • Norbert F Ajeawung
  • Jessica Tardif
  • Klaus Dieterich
  • Tabib Dabir
  • Dina Vind-Kezunovic
  • Susan M White
  • Denes Zadori
  • Claudia Castiglioni
  • Lisbeth Tranebjærg
  • Pernille Mathiesen Tørring
  • Ed Blair
  • Marzena Wisniewska
  • Maria Vittoria Camurri
  • Yolande van Bever
  • Sirinart Molidperee
  • Juliet Taylor
  • Alexandre Dionne-Laporte
  • Sanjay M Sisodiya
  • Raoul C M Hennekam
  • Philippe M Campeau
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PURPOSE: Biallelic variants in TBC1D24, which encodes a protein that regulates vesicular transport, are frequently identified in patients with DOORS (deafness, onychodystrophy, osteodystrophy, intellectual disability [previously referred to as mental retardation], and seizures) syndrome. The aim of the study was to identify a genetic cause in families with DOORS syndrome and without a TBC1D24 variant.

METHODS: Exome or Sanger sequencing was performed in individuals with a clinical diagnosis of DOORS syndrome without TBC1D24 variants.

RESULTS: We identified the same truncating variant in ATP6V1B2 (NM_001693.4:c.1516C>T; p.Arg506*) in nine individuals from eight unrelated families with DOORS syndrome. This variant was already reported in individuals with dominant deafness onychodystrophy (DDOD) syndrome. Deafness was present in all individuals, along with onychodystrophy and abnormal fingers and/or toes. All families but one had developmental delay or intellectual disability and five individuals had epilepsy. We also describe two additional families with DDOD syndrome in whom the same variant was found.

CONCLUSION: We expand the phenotype associated with ATP6V1B2 and propose another causal gene for DOORS syndrome. This finding suggests that DDOD and DOORS syndromes might lie on a spectrum of clinically and molecularly related conditions.

Original languageEnglish
JournalGenetics in medicine : official journal of the American College of Medical Genetics
Volume23
Issue number1
Pages (from-to)149-154
Number of pages6
ISSN1098-3600
DOIs
Publication statusPublished - Jan 2021

    Research areas

  • ATP6V1B2 gene, DDOD syndrome, DOORS syndrome, exome sequencing, TBC1D24 gene

ID: 61066204