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Rodríguez-García ME, Cotrina-Vinagre FJ, Bellusci M, Hernández-Sánchez L, de Aragón AM, López-Laso E, Martín-Hernández E, Martínez-Azorín F. First splicing variant in HECW2 with an autosomal recessive pattern of inheritance and associated with NDHSAL. Hum Mutat 2022; 43:1361-1367. [PMID: 35753050 DOI: 10.1002/humu.24426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 06/06/2022] [Accepted: 06/21/2022] [Indexed: 11/07/2022]
Abstract
We report the clinical and genetic features of a Caucasian girl who presented a severe neurodevelopmental disorder with drug-resistant epilepsy, hypotonia, severe gastro-esophageal reflux and brain MRI anomalies. WES uncovered a novel variant in homozygosis (g.197092814_197092824delinsC) in HECW2 gene that encodes the E3 ubiquitin-protein ligase HECW2. This protein induces ubiquitination and is implicated in the regulation of several important pathways involved in neurodevelopment and neurogenesis. Furthermore, de novo heterozygous missense variants in this gene have been associated with NDHSAL. The homozygous variant of our patient disrupts the splice donor site of intron 22 and causes the elimination of exon 22 (r.3766_3917+1del) leading to an in-frame deletion of the protein (p.Leu1256_Trp1306del). Functional studies showed a two-fold increase of its RNA expression, while the protein expression level was reduced by 60%, suggesting a partial LOF mechanism of pathogenesis. Thus, this is the first patient with NDHSAL caused by an autosomal recessive splicing variant in HECW2. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- María Elena Rodríguez-García
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN) Instituto de Investigación Hospital 12 de Octubre (i+12), E-28041, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), E-28041, Madrid, Spain
| | - Francisco Javier Cotrina-Vinagre
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN) Instituto de Investigación Hospital 12 de Octubre (i+12), E-28041, Madrid, Spain
| | - Marcello Bellusci
- Unidad Pediátrica de Enfermedades Raras, Enfermedades Mitocondriales y Metabólicas Hereditarias, Hospital 12 de Octubre, E-28041, Madrid, Spain
| | - Laura Hernández-Sánchez
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN) Instituto de Investigación Hospital 12 de Octubre (i+12), E-28041, Madrid, Spain
| | | | - Eduardo López-Laso
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), E-28041, Madrid, Spain.,Unidad de Neurología Pediátrica, Hospital Universitario Reina Sofia IMIBIC, E-14004, Córdoba, Spain
| | - Elena Martín-Hernández
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN) Instituto de Investigación Hospital 12 de Octubre (i+12), E-28041, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), E-28041, Madrid, Spain.,Unidad Pediátrica de Enfermedades Raras, Enfermedades Mitocondriales y Metabólicas Hereditarias, Hospital 12 de Octubre, E-28041, Madrid, Spain
| | - Francisco Martínez-Azorín
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN) Instituto de Investigación Hospital 12 de Octubre (i+12), E-28041, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), E-28041, Madrid, Spain
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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] [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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Acharya A, Kavus H, Dunn P, Nasir A, Folk L, Withrow K, Wentzensen IM, Ruzhnikov MRZ, Fallot C, Smol T, Rama M, Brown K, Whalen S, Ziegler A, Barth M, Chassevent A, Smith-Hicks C, Afenjar A, Courtin T, Heide S, Font-Montgomery E, Heid C, Hamm JA, Love DR, Thabet F, Misra VK, Cunningham M, Leal SM, Jarvela I, Normand EA, Zou F, Helal M, Keren B, Torti E, Chung WK, Schrauwen I. Delineating the genotypic and phenotypic spectrum of HECW2-related neurodevelopmental disorders. J Med Genet 2021; 59:669-677. [PMID: 34321324 DOI: 10.1136/jmedgenet-2021-107871] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/06/2021] [Indexed: 11/03/2022]
Abstract
BACKGROUND Variants in HECW2 have recently been reported to cause a neurodevelopmental disorder with hypotonia, seizures and impaired language; however, only six variants have been reported and the clinical characteristics have only broadly been defined. METHODS Molecular and clinical data were collected from clinical and research cohorts. Massive parallel sequencing was performed and identified individuals with a HECW2-related neurodevelopmental disorder. RESULTS We identified 13 novel missense variants in HECW2 in 22 unpublished cases, of which 18 were confirmed to have a de novo variant. In addition, we reviewed the genotypes and phenotypes of previously reported and new cases with HECW2 variants (n=35 cases). All variants identified are missense, and the majority of likely pathogenic and pathogenic variants are located in or near the C-terminal HECT domain (88.2%). We identified several clustered variants and four recurrent variants (p.(Arg1191Gln);p.(Asn1199Lys);p.(Phe1327Ser);p.(Arg1330Trp)). Two variants, (p.(Arg1191Gln);p.(Arg1330Trp)), accounted for 22.9% and 20% of cases, respectively. Clinical characterisation suggests complete penetrance for hypotonia with or without spasticity (100%), developmental delay/intellectual disability (100%) and developmental language disorder (100%). Other common features are behavioural problems (88.9%), vision problems (83.9%), motor coordination/movement (75%) and gastrointestinal issues (70%). Seizures were present in 61.3% of individuals. Genotype-phenotype analysis shows that HECT domain variants are more frequently associated with cortical visual impairment and gastrointestinal issues. Seizures were only observed in individuals with variants in or near the HECT domain. CONCLUSION We provide a comprehensive review and expansion of the genotypic and phenotypic spectrum of HECW2 disorders, aiding future molecular and clinical diagnosis and management.
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Affiliation(s)
- Anushree Acharya
- Center for Statistical Genetics, Gertrude H. Sergievsky Center and the Department of Neurology, Columbia University Medical Center, New York, New York, USA
| | - Haluk Kavus
- Department of Pediatrics, Columbia University, New York, New York, USA
| | - Patrick Dunn
- The George Washington University, Washington, District of Columbia, USA
| | - Abdul Nasir
- Department of Molecular Science and Technology, Ajou University, Suwon, The Republic of Korea
| | | | | | | | - Maura R Z Ruzhnikov
- Neurology and Neurological Sciences, Pediatrics, Division of Medical Genetics, Stanford University and Lucile Packard Children's Hospital, Palo Alto, California, USA
| | | | - Thomas Smol
- Institut de Génétique, Univ Lille, EA7364 RADEME, CHU Lille, Lille, France
| | | | - Kathleen Brown
- Pediatrics-Clinical Genetics and Metabolism, School of Medicine, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Sandra Whalen
- UF de génétique Clinique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, Assistance Publique-Hôpitaux de Paris (APHP) Sorbonne Université, Hôpital Armand Trousseau, ERN-ITHACA, Paris, France
| | - Alban Ziegler
- Department of Genetics, Angers University Hospital, Angers, France
| | - Magali Barth
- Department of Genetics, Angers University Hospital, Angers, France
| | - Anna Chassevent
- Division of Neurogenetics, Kennedy Krieger Institute, Baltimore, Maryland, USA
| | - Constance Smith-Hicks
- Division of Neurogenetics, Kennedy Krieger Institute, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Alexandra Afenjar
- Assistance Publique-Hôpitaux de Paris (APHP) Sorbonne Université, Centre de Référence Malformations et maladies congénitales du cervelet et déficiences intellectuelles de causes rares, département de génétique et embryologie médicale, Hôpital Trousseau, Paris, France
| | - Thomas Courtin
- Département de génétique, Hôpital Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris (APHP), Paris, France
| | - Solveig Heide
- Department of Genetics, Pitié-Salpêtrière Hospital, Referral Center for Intellectual Disabilities of Rare Causes, Assistance Publique-Hôpitaux de Paris (APHP) Sorbonne Université, Paris, France
| | | | - Caleb Heid
- University Hospital Medical Genetics Clinic, University of Missouri, Columbia, Missouri, USA
| | - J Austin Hamm
- Pediatric Genetics, East Tennessee Children's Hospital, Knoxville, Tennessee, USA
| | | | - Farouq Thabet
- Pediatric Neurology Division, Sidra Medicine, Doha, Qatar
| | - Vinod K Misra
- Department of Pediatrics, Division of Genetic, Genomic, and Metabolic Disorders, Children's Hospital of Michigan, Detroit, Michigan, USA.,Discipline of Pediatrics, Central Michigan University, Mount Pleasant, Michigan, USA
| | - Mitch Cunningham
- Department of Pediatrics, Division of Genetic, Genomic, and Metabolic Disorders, Children's Hospital of Michigan, Detroit, Michigan, USA
| | - Suzanne M Leal
- Center for Statistical Genetics, Gertrude H. Sergievsky Center and the Department of Neurology, Columbia University Medical Center, New York, New York, USA.,Taub Institute for Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, New York, USA
| | - Irma Jarvela
- Department of Medical Genetics, University of Helsinki, Helsinki, Finland
| | | | | | - Mayada Helal
- Department of Pediatrics, Columbia University, New York, New York, USA
| | - Boris Keren
- Département de génétique, Hôpital Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris (APHP), Paris, France
| | | | - Wendy K Chung
- Department of Pediatrics, Columbia University, New York, New York, USA .,Department of Medicine, Columbia University, New York, New York, USA
| | - Isabelle Schrauwen
- Center for Statistical Genetics, Gertrude H. Sergievsky Center and the Department of Neurology, Columbia University Medical Center, New York, New York, USA
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