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Krutish A, Elmore J, Ilse W, Johnston JL, Hittel D, Kerr M, Khan A, Rockman-Greenberg C, Mhanni AA. A novel WFS1 variant associated with isolated congenital cataracts. Cold Spring Harb Mol Case Stud 2023; 9:mcs.a006259. [PMID: 36781206 PMCID: PMC10111794 DOI: 10.1101/mcs.a006259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Accepted: 02/06/2023] [Indexed: 02/15/2023] Open
Abstract
Biallelic variants in the WFS1 gene are associated with Wolfram syndrome. However, recent publications document that heterozygous variants can lead to a variety of phenotypes, such as Wolfram-like syndrome or isolated features of Wolfram syndrome. In this case report, we present a male patient with a history of congenital cataracts and subjective complaints of muscle weakness. Clinical assessment demonstrated normal muscle strength, and genomic, biochemical, electrophysiologic, and muscle biopsy studies did not identify a potential cause of the proband's perceived muscle weakness. Whole-exome sequencing identified a novel de novo variant in the WFS1 gene (c.1243G > T), representing one of only several patients in the published literature with isolated congenital cataracts and a heterozygous WFS1 variant. The variety of phenotypes associated with heterozygous variants in WFS1 suggests that this gene should be considered as a cause of both dominant and biallelic/recessive forms of disease. Future research should focus on elucidating the mechanism(s) of disease and variable expressivity in WFS1 in order to improve our ability to provide patients and families with anticipatory guidance about the disease, including appropriate screening and medical interventions.
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Affiliation(s)
- Angela Krutish
- Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Biochemistry and Medical Genetics, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - James Elmore
- Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Werner Ilse
- Section of Neurology, Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Janine L Johnston
- Section of Neurology, Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Ophthalmology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Dustin Hittel
- Discovery DNA, Inc., Calgary, Alberta, T2L 1Y8, Canada
| | - Marina Kerr
- Discovery DNA, Inc., Calgary, Alberta, T2L 1Y8, Canada
| | - Aneal Khan
- Discovery DNA, Inc., Calgary, Alberta, T2L 1Y8, Canada
- M.A.G.I.C. Clinic Ltd. (Metabolics and Genetics in Canada), Calgary, Alberta, T2E 7Z4, Canada
| | - Cheryl Rockman-Greenberg
- Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Biochemistry and Medical Genetics, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
| | - Aizeddin A Mhanni
- Children's Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada;
- Department of Biochemistry and Medical Genetics, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
- Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
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Jabbarpour N, Saei H, Jabbarpoor Bonyadi MH, Bonyadi M. Identification of novel cis-mutations in the GJA8 gene in a 3-generation Iranian family with autosomal dominant congenital nuclear cataract. Ophthalmic Genet 2022; 43:609-614. [PMID: 35726576 DOI: 10.1080/13816810.2022.2089363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND Cataract is mainly due to the presence of high molecular weight protein, which disrupts the normal function of the lens. Pathogenic variants in Gap Junction protein alpha-8 (GJA8) have been associated with autosomal dominant congenital nuclear cataract. In general, mutations in those genes that have important functions in lens development lead to congenital cataract. METHODS We conducted whole-exome sequencing (WES) in a four-year-old male patient referred to the genetic center for genetic analysis. He had developed cataract at an early age. DNAs were extracted from the blood samples of all family members and subjected to PCR-Sanger sequencing to confirm the WES results. RESULTS WES analysis on the proband revealed two mutations in the GJA8 gene (c.G12C, c.G58A). His mother, alongside several other members of the third-generation family, had developed cataract. Sanger sequencing of the interested regions showed that these two mutations were co-segregated in all affected members. However, none of the healthy individuals carried these mutations confirming that these two mutations are located in the same allele (complex allele). Bioinformatics analysis of the mutated GJA8 RNA and protein structure confirmed the pathogenicity of the cis-mutations. CONCLUSIONS Genetic segregation analysis in a three-generation family and also bioinformatics analysis showed that the complex-allele containing c.G12C+c.G58A mutations in the GJA8 gene is a pathogenic variant that causes autosomal-dominant congenital nuclear cataract.
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Affiliation(s)
- Neda Jabbarpour
- Animal Biology Department, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
| | - Hassan Saei
- Laboratoire des Maladies Rénales Héréditaires, Institut Imagine, Université de Paris-Cité, Paris, France
| | | | - Mortaza Bonyadi
- Center of Excellence for Biodiversity, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
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Bourne SC, Townsend KN, Shyr C, Matthews A, Lear SA, Attariwala R, Lehman A, Wasserman WW, van Karnebeek C, Sinclair G, Vallance H, Gibson WT. Optic atrophy, cataracts, lipodystrophy/lipoatrophy, and peripheral neuropathy caused by a de novo OPA3 mutation. Cold Spring Harb Mol Case Stud 2017; 3:a001156. [PMID: 28050599 PMCID: PMC5171695 DOI: 10.1101/mcs.a001156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Accepted: 10/20/2016] [Indexed: 11/25/2022] Open
Abstract
We describe a woman who presented with cataracts, optic atrophy, lipodystrophy/lipoatrophy, and peripheral neuropathy. Exome sequencing identified a c.235C > G p.(Leu79Val) variant in the optic atrophy 3 (OPA3) gene that was confirmed to be de novo. This report expands the severity of the phenotypic spectrum of autosomal dominant OPA3 mutations.
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Affiliation(s)
- Stephanie C Bourne
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| | - Katelin N Townsend
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
| | - Casper Shyr
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
| | - Allison Matthews
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
| | - Scott A Lear
- Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia V5A 1S6, Canada
| | - Raj Attariwala
- AIM Medical Imaging, Vancouver, British Columbia V6H 1C9, Canada
| | - Anna Lehman
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Wyeth W Wasserman
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
| | - Clara van Karnebeek
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
| | - Graham Sinclair
- Department of Pathology, British Columbia Children's Hospital, Vancouver, British Columbia V6H 3N1, Canada
| | - Hilary Vallance
- Department of Pathology, British Columbia Children's Hospital, Vancouver, British Columbia V6H 3N1, Canada
| | - William T Gibson
- Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- Child and Family Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia V5Z 4H4, Canada
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