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Functional Assessment of Variants Associated with Wolfram Syndrome

Riachi, M; Yilmaz, S; Kurnaz, E; Aycan, Z; Çetinkaya, S; Tranebjærg, L; Rendtorff, ND; ... Hussain, K; + view all (2019) Functional Assessment of Variants Associated with Wolfram Syndrome. Human Molecular Genetics , 28 (22) pp. 3815-3824. 10.1093/hmg/ddz212. Green open access

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Abstract

Wolfram Syndrome (WS) is a heterogeneous multisystem neurodegenerative disorder with two allelic variations in addition to a separate subtype known as WS type 2. The wide phenotypic spectrum of WS includes diabetes mellitus and optic atrophy which is often accompanied by diabetes insipidus, deafness, urological and neurological complications in combination or in isolation. To date, the understanding of the genotype phenotype relationship in this complex syndrome remains poorly understood. In this study we identified and explored the functionality of rare and novel variants in the two causative WS genes WFS1 and CISD2 by assessing the effects of the mutations on the encoded proteins Wolframin and ERIS, in a cohort of 12 patients with autosomal recessive WS, dominant WS and WS type 2. The identified pathogenic variants included missense changes, frameshift deletions and insertions in WFS1 and an exonic deletion in CISD2 which all altered the respective encoded protein in a manner that did not correlate to the phenome previously described. These observations suggest the lack of genotype phenotype correlation in this complex syndrome and the need to explore other molecular genetic mechanisms. Additionally, our findings highlight the importance of functionally assessing variants for their pathogenicity to tackle the problem of increasing variants of unknown significance (VUS) in the public genetic databases.

Type: Article
Title: Functional Assessment of Variants Associated with Wolfram Syndrome
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/hmg/ddz212
Publisher version: https://doi.org/10.1093/hmg/ddz212
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: phenotype, diabetes mellitus, genetics, molecular, mutation, diabetes insipidus, heterogeneity, genetic databases, frameshift mutation function, genes, genotype, neurodegenerative disorders, optic atrophy, wolfram syndrome, autosomal recessive inheritance, hearing impairment, pathogenicity, neurologic complications, genotype-phenotype associations
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 Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Renal Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health > Genetics and Genomic Medicine Dept
URI: https://discovery.ucl.ac.uk/id/eprint/10084040
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