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Krami AM, Bouzidi A, Charif M, Amalou G, Charoute H, Rouba H, Roky R, Lenaers G, Barakat A, Nahili H. A homozygous nonsense HECW2 variant is associated with neurodevelopmental delay and intellectual disability. Eur J Med Genet 2022; 65:104515. [PMID: 35487419 DOI: 10.1016/j.ejmg.2022.104515] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 03/07/2022] [Accepted: 04/23/2022] [Indexed: 11/17/2022]
Abstract
Intellectual disability is characterized by a significant impaired intellectual and adaptive functioning, affecting approximately 1-3% of the population, which can be caused by a variety of environmental and genetic factors. In this respect, de novo heterozygous HECW2 variants were associated recently with neurodevelopmental disorders associated to hypotonia, seizures, and absent language. HECW2 encodes an E3 ubiquitin-protein ligase that stabilizes and enhances transcriptional activity of p73, a key factor regulating proliferation, apoptosis, and neuronal differentiation, which are together essential for proper brain development. Here, using whole exome sequencing, we identified a homozygous nonsense HECW2 variant: c.736C > T; p.Arg246* in a proband from a Moroccan consanguineous family, with developmental delay, intellectual disability, hypotonia, generalized tonico-clonic seizures and a persistent tilted head. Thus this study describes the first homozygous HECW2 variant, inherited as an autosomal recessive pattern, contrasting with former reported de novo variants found in HECW2 patients.
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Affiliation(s)
- Al Mehdi Krami
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Laboratory of Physiopathology, Molecular Genetics & Biotechnology, Faculty of Sciences Ain Chock, Health and Biotechnology Research Centre, Hassan II University of Casablanca, Maarif B.P, 5366, Casablanca, Morocco.
| | - Aymane Bouzidi
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Université Angers, MitoLab Team, UMR CNRS 6015, INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France; Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaïb Doukkali University, El Jadida, Morocco
| | - Majida Charif
- Genetics and Immuno-Cell Therapy Team, Mohammed First University, Oujda, Morocco
| | - Ghita Amalou
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco; Université Angers, MitoLab Team, UMR CNRS 6015, INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France; Team of Anthropogenetics and Biotechnologies, Faculty of Sciences, Chouaïb Doukkali University, El Jadida, Morocco
| | - Hicham Charoute
- Research Unit of Epidemiology, Biostatistics and Bioinfortmatics, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Hassan Rouba
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Rachida Roky
- Laboratory of Physiopathology, Molecular Genetics & Biotechnology, Faculty of Sciences Ain Chock, Health and Biotechnology Research Centre, Hassan II University of Casablanca, Maarif B.P, 5366, Casablanca, Morocco
| | - Guy Lenaers
- Université Angers, MitoLab Team, UMR CNRS 6015, INSERM U1083, Institut MitoVasc, SFR ICAT, Angers, France; Service de Neurologie, CHU d'Angers, Angers, France
| | - Abdelhamid Barakat
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Halima Nahili
- Genomics and Human Genetics Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
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Yang Y, Tang N, Zhu Y, Zhang L, Cao X, Liu L, Xia W, Li P, Yang Y. A novel homozygous nonsense mutation in the CA2 gene (c.368G>A, p.W123X) linked to carbonic anhydrase II deficiency syndrome in a Chinese family. Metab Brain Dis 2021; 36:589-599. [PMID: 33555497 DOI: 10.1007/s11011-021-00677-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/24/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND Carbonic anhydrase II deficiency syndrome is an autosomal recessive osteopetrosis with renal tubular acidosis and cerebral calcifications. We tried to detect the causative mutation for carbonic anhydrase II deficiency syndrome in a five-generation Chinese family. MATERIALS AND METHODS Genomic DNA was extracted from whole blood of the proband, his grandmother, parents, aunt, uncle and sister. The exomes were sequenced by whole exon sequencing followed by genetic analysis and Sanger sequencing validation. Then, physical and chemical properties studies and structure analysis were performed on mutated protein. Finally, Minigene model of vector plasmids for wild type and mutant type was constructed and transfected into human embryonic kidney 293T cells to further explore the expression change of CA2 transcript and protein after mutation. RESULTS Sequencing and genetic analysis have revealed the homozygous nonsense mutation of CA2 gene (c.368G > A, p.W123X) in the exon 4 of chromosome 8 of the proband, while it was not found in his grandmother, parents, aunt, uncle and sister. Furthermore, Sanger sequencing in the proband and his parents validated the mutation. Properties and structure of mutated CA2 proteins changed after mutation, especially in change of protein modification and hindrance of zinc ions binding, which may lead to decreased protein expression level of CA2. CONCLUSIONS We found a new homozygous nonsense mutation in CA2 gene (c.368G > A, p.W123X), which may be valuable in the early diagnosis and therapy of carbonic anhydrase II deficiency syndrome.
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Affiliation(s)
- Yan Yang
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Nie Tang
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Ying Zhu
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Lei Zhang
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Xu Cao
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Limei Liu
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Wei Xia
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Pengqiu Li
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China
| | - Yi Yang
- Department of Endocrinology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, No. 32 the west second section of the first ring road, Qingyang District, Chengdu, Sichuan, 610072, China.
- Chinese Academy of Sciences Sichuan Translational Medicine Research Hospital, 610072, Chengdu, China.
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Greisenegger EK, Llufriu S, Chamorro A, Cervera A, Jimenez-Escrig A, Rappersberger K, Marik W, Greisenegger S, Stögmann E, Kopp T, Strom TM, Henes J, Joutel A, Zimprich A. A NOTCH3 homozygous nonsense mutation in familial Sneddon syndrome with pediatric stroke. J Neurol 2020; 268:810-816. [PMID: 32980981 PMCID: PMC7914241 DOI: 10.1007/s00415-020-10081-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/05/2020] [Accepted: 07/13/2020] [Indexed: 11/25/2022]
Abstract
Sneddon syndrome is a rare disorder affecting small and medium-sized blood vessels that is characterized by the association of livedo reticularis and stroke. We performed whole-exome sequencing (WES) in 2 affected siblings of a consanguineous family with childhood-onset stroke and identified a homozygous nonsense mutation within the epidermal growth factor repeat (EGFr) 19 of NOTCH3, p.(Arg735Ter). WES of 6 additional cases with adult-onset stroke revealed 2 patients carrying heterozygous loss-of-function variants in putative NOTCH3 downstream genes, ANGPTL4, and PALLD. Our findings suggest that impaired NOTCH3 signaling is one underlying disease mechanism and that bi-allelic loss-of-function mutation in NOTCH3 is a cause of familial Sneddon syndrome with pediatric stroke.
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Affiliation(s)
- Elli Katharine Greisenegger
- Department of Dermatology and Venereology, University Hospital of St. Pölten, Karl Landsteiner University of Health Sciences, St. Pölten, Austria
- Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Sara Llufriu
- Laboratory of Advanced Imaging in Neuroimmunological Diseases, Center of Neuroimmunology, Hospital Clinic Barcelona, IDIBAPS and Universitat de Barcelona, Barcelona, Spain
| | - Angel Chamorro
- Department of Neuroscience, Comprehensive Stroke Center, Hospital Clinic Barcelona, Barcelona, Spain
- Institure Investigacions Biomèdicas August Pi I Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain
| | | | | | | | - Wolfgang Marik
- Division of Neuroradiology and Musculoskeletal Radiology, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Stefan Greisenegger
- Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Elisabeth Stögmann
- Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Tamara Kopp
- Juvenis Medical Center, 1010, Vienna, Austria
| | - Tim M Strom
- Institute of Human Genetics, Technical University Munich, Munich, Germany
- Department of Internal Medicine II (Hematology, Oncology, Rheumatology and Clinical Immunology), Centre for Interdisciplinary Clinical Rheumatology and Immunology, Eberhard Karls-University Tuebingen, Tübingen, Germany
| | - Jörg Henes
- Department of Internal Medicine II (Hematology, Oncology, Rheumatology and Clinical Immunology), Centre for Interdisciplinary Clinical Rheumatology and Immunology, Eberhard Karls-University Tuebingen, Tübingen, Germany
| | - Anne Joutel
- Institute of Psychiatry and Neurosciences of Paris, INSERM UMR1266, University of Paris, 75014, Paris, France
| | - Alexander Zimprich
- Department of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria.
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