DOORS syndrome and a recurrent truncating ATP6V1B2 variant

E Beauregard-Lacroix, G Pacheco-Cuellar, NF Ajeawung, J Tardif, K Dieterich, T Dabir, D Vind-Kezunovic, SM White, D Zadori, C Castiglioni, L Tranebjærg, PM Tørring, E Blair, M Wisniewska, MV Camurri, Yolande Bever, S Molidperee, J Taylor, A Dionne-Laporte, SM SisodiyaRC Hennekam, PM Campeau

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)149-154
Number of pages6
JournalGenetics in Medicine
Volume23
Issue number1
DOIs
Publication statusPublished - Jan 2021

Bibliographical note

Funding Information:
We thank all families. This study was funded in part by Canadian Institutes of Health Research and Fonds de la Recherche du Québec–Santé awards to P.M.C.

Publisher Copyright:
© 2020, American College of Medical Genetics and Genomics.

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