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DOORS syndrome and a recurrent truncating ATP6V1B2 variant

Beauregard-Lacroix, E; Pacheco-Cuellar, G; Ajeawung, NF; Tardif, J; Dieterich, K; Dabir, T; Vind-Kezunovic, D; ... Campeau, PM; + view all (2021) DOORS syndrome and a recurrent truncating ATP6V1B2 variant. Genetics in Medicine , 23 pp. 149-154. 10.1038/s41436-020-00950-9. Green open access

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Abstract

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.

Type: Article
Title: DOORS syndrome and a recurrent truncating ATP6V1B2 variant
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41436-020-00950-9
Publisher version: https://doi.org/10.1038/s41436-020-00950-9
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: ATP6V1B2 gene, DDOD syndrome, DOORS syndrome, TBC1D24 gene, exome sequencing
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Experimental Epilepsy
URI: https://discovery.ucl.ac.uk/id/eprint/10110309
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