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1. Exome sequencing identifies the first genetic determinants of sirenomelia in humans

Author

Marianne Begorre, Daniel Cailliez, Claire Beneteau, Pierre Chenal, Thierry Frebourg, Guillaume Benoist, François Lecoquierre, Raphaele Mangione, Florence Petit, Nicolas Gruchy, Louise Devisme, Sophie Patrier, Juliette Coursimault, Fanny Pelluard, Hubert Journel, Bénédicte Gérard, Marion Gérard, Pascale Saugier-Veber, Valérie Layet, Alain Liquier, Corinne Jeanne, Mirjam M. de Jong, Nadia Tillouche, Anne Bazin, Gaël Nicolas, Conny M. A. van Ravenswaaij-Arts, Anne-Claire Brehin, Wilfrid Finck, Sophie Coutant, Sophie Degre, Christine Francannet, Madeleine Joubert, Hélène Laurichesse Delmas, Génomique et Médecine Personnalisée du Cancer et des Maladies Neuropsychiatriques (GPMCND), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratoire CERBA [Saint Ouen l'Aumône], Service d'Anatomie Pathologique [CHU Clermont-Ferrand], CHU Gabriel Montpied [Clermont-Ferrand], CHU Clermont-Ferrand-CHU Clermont-Ferrand, Université de Lausanne = University of Lausanne (UNIL), Service de Gynécologie-Obstétrique et Médecine de la Reproduction [CHU Caen], Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-CHU Caen, Normandie Université (NU)-Tumorothèque de Caen Basse-Normandie (TCBN)-Tumorothèque de Caen Basse-Normandie (TCBN), Service de génétique médicale - Unité de génétique clinique [Nantes], Université de Nantes (UN)-Centre hospitalier universitaire de Nantes (CHU Nantes), Groupe Hospitalier du Havre, University of Groningen [Groningen], Institut de Pathologie [CHU Lille], Pôle de Biologie Pathologie Génétique [CHU Lille], Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille)-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), CHU Clermont-Ferrand, Service d'hématologie et immunologie, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-AP-HP - Hôpital Bichat - Claude Bernard [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Université Paris Diderot - Paris 7 (UPD7), CHU Caen, Normandie Université (NU)-Tumorothèque de Caen Basse-Normandie (TCBN), Génétique Médicale, Centre hospitalier Bretagne Atlantique (Morbihan) (CHBA)-Hôpital Chubert, Unité de Cytogénétique et Génétique Médicale, Groupe Hospitalier du Havre-Hôpital Gustave Flaubert, Service d'Anatomie et Cytologie Pathologique [CHU Rouen], CHU Rouen, Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Laboratoire d'anatomie pathologique, CHU Bordeaux [Bordeaux]-Groupe hospitalier Pellegrin, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Laboratoire de cytogénétique prénatale [CHU Caen], UNIROUEN - UFR Santé (UNIROUEN UFR Santé), Normandie Université (NU)-Normandie Université (NU), Service de Génétique [CHU Caen], Clinical Cognitive Neuropsychiatry Research Program (CCNP), Université de Lausanne (UNIL), Université Paris Diderot - Paris 7 (UPD7)-AP-HP - Hôpital Bichat - Claude Bernard [Paris], and Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)

Subjects
Male, Genotype, audal dysgenesis, Ectromelia, [SDV]Life Sciences [q-bio], REQUIREMENT, Malformation sequence, Biology, Sirenomelia, CAUDAL REGRESSION, Frameshift mutation, 03 medical and health sciences, Genetics, medicine, Humans, CDX2 Transcription Factor, Genetic Predisposition to Disease, CDX2, Gene, Alleles, Genetic Association Studies, Genetics (clinical), Exome sequencing, Adaptor Proteins, Signal Transducing, 030304 developmental biology, 0303 health sciences, Calcium-Binding Proteins, 030305 genetics & heredity, Wnt signaling pathway, Heterozygote advantage, DEFECTS, medicine.disease, caudal dysgenesis, de novo mutation, Pedigree, Phenotype, Amino Acid Substitution, GROWTH, Female, CDX2 de novo mutation, exome sequencing
Abstract

Full access; International audience; Sirenomelia is a rare severe malformation sequence of unknown cause characterized by fused legs and severe visceral abnormalities. We present a series of nine families including two rare familial aggregations of sirenomelia investigated by a trio‐based exome sequencing strategy. This approach identified CDX2 variants in the two familial aggregations, both fitting an autosomal dominant pattern of inheritance with variable expressivity. CDX2 is a major regulator of caudal development in vertebrate and mouse heterozygotes are a previously described model of sirenomelia. Remarkably, the p.(Arg237His) variant has already been reported in a patient with persistent cloaca. Analysis of the sporadic cases revealed six additional candidate variants including a de novo frameshift variant in the genetically constrained NKD1 gene, encoding a known interactor of CDX2 . We provide the first insights for a genetic contribution in human sirenomelia and highlight the role of Cdx and Wnt signaling pathways in the development of this disorder.

Published
2020
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2. MYT1L-associated neurodevelopmental disorder: description of 40 new cases and literature review of clinical and molecular aspects

Author

James W. Wheless, Thierry Frebourg, Robert Olaso, Rosemarie Smith, Kelly Nori, François Lecoquierre, Delphine Héron, Roseline Caumes, Anne Boland, Ange-Line Bruel, Candy Kumps, Gaël Nicolas, Sarah Stewart, Sophie Rondeau, Diane Doummar, Marlène Rio, Giulia Barcia, Anne-Marie Guerrot, Gwenaël Le Guyader, Alexandra Afenjar, Sarah Vergult, Karine Poirier, Juliette Coursimault, Jennifer Morrison, Amy Kritzer, Anne-Sophie Alaix, Rebecca Hernan, Anne-Sophie Denommé-Pichon, Sabine Sigaudy, Christine Coubes, Pascale Saugier-Veber, Francisca Millan Zamora, Austin Larson, Michelle M. Morrow, Christine Poitou, Björn Menten, Mathilde Nizon, Thomas Smol, Elise Schaefer, Bénédicte Gérard, Charles Coutton, Salima El Chehadeh, Fanggeng Zou, Stéphanie Valence, Anita Shanmugham, Wendy K. Chung, Bert Callewaert, Christina Kresge, Arnold Munnich, Beth A. Pletcher, Laurence Faivre, Estelle Colin, Laurence Colleaux, Patricia G Wheeler, Annelies Dheedene, Frédéric Tran Mau-Them, Jean-François Deleuze, Claude Houdayer, Jeanne Amiel, Frédéric Bilan, Marine Tessarech, Bertrand Isidor, Guillaume Jouret, Cyril Mignot, Benjamin Cogné, Shuxi Liu, Boris Keren, Françoise Devillard, Catherine Schramm, Margaret Helm, Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), GeneDx [Gaithersburg, MD, USA], Centre hospitalier universitaire de Poitiers (CHU Poitiers), Université Bourgogne Franche-Comté [COMUE] (UBFC), Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), Institut de génétique médicale d’Alsace, Centre hospitalier universitaire de Nantes (CHU Nantes), Hôpital Trousseau, Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), Sorbonne Université (SU), Institute for Advanced Biosciences / Institut pour l'Avancée des Biosciences (Grenoble) (IAB), Centre Hospitalier Universitaire [Grenoble] (CHU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Etablissement français du sang - Auvergne-Rhône-Alpes (EFS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), CHU Grenoble, Institut Necker Enfants-Malades (INEM - UM 111 (UMR 8253 / U1151)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Marseille medical genetics - Centre de génétique médicale de Marseille (MMG), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Imagine - Institut des maladies génétiques (IMAGINE - U1163), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Ghent University Hospital, Columbia University Irving Medical Center (CUIMC), University of Colorado Anschutz [Aurora], University of Tennessee System, Rutgers New Jersey Medical School (NJMS), Rutgers University System (Rutgers), Université de Lille, Hôpital de la Timone [CHU - APHM] (TIMONE), CHU Montpellier, Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Maine Medical Center, Arnold Palmer Hospital, Boston Children's Hospital, National Center of Genetics, Centre National de Recherche en Génomique Humaine (CNRGH), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), and ANR-10-INBS-0009,France-Génomique,Organisation et montée en puissance d'une Infrastructure Nationale de Génomique(2010)

Subjects
Male, Bioinformatics, Epilepsy, 0302 clinical medicine, Neurodevelopmental disorder, MESH: Child, Intellectual disability, Missense mutation, MESH: Obesity, MESH: Genetic Variation, MESH: Nerve Tissue Proteins, Child, Genetics (clinical), MESH: Genetic Association Studies, MESH: Heterozygote, 0303 health sciences, MESH: Transcription Factors, MESH: Infant, 3. Good health, Phenotype, MESH: Feeding and Eating Disorders, MESH: Young Adult, Child, Preschool, MESH: Epilepsy, Learning disability, Female, medicine.symptom, Adult, Heterozygote, Adolescent, Language delay, Nerve Tissue Proteins, Biology, MESH: Phenotype, MESH: Language Development Disorders, Feeding and Eating Disorders, Young Adult, 03 medical and health sciences, Genetics, medicine, Humans, Language Development Disorders, Obesity, Genetic Association Studies, 030304 developmental biology, MESH: Neurodevelopmental Disorders, MESH: Adolescent, MESH: Humans, MESH: Child, Preschool, Genetic Variation, Infant, MESH: Adult, medicine.disease, Human genetics, MESH: Male, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, Neurodevelopmental Disorders, Autism, MESH: Female, 030217 neurology & neurosurgery, Transcription Factors
Abstract

International audience; Pathogenic variants of the myelin transcription factor-1 like (MYT1L) gene include heterozygous missense, truncating variants and 2p25.3 microdeletions and cause a syndromic neurodevelopmental disorder (OMIM#616,521). Despite enrichment in de novo mutations in several developmental disorders and autism studies, the data on clinical characteristics and genotype-phenotype correlations are scarce, with only 22 patients with single nucleotide pathogenic variants reported. We aimed to further characterize this disorder at both the clinical and molecular levels by gathering a large series of patients with MYT1L-associated neurodevelopmental disorder. We collected genetic information on 40 unreported patients with likely pathogenic/pathogenic MYT1L variants and performed a comprehensive review of published data (total = 62 patients). We confirm that the main phenotypic features of the MYT1L-related disorder are developmental delay with language delay (95%), intellectual disability (ID, 70%), overweight or obesity (58%), behavioral disorders (98%) and epilepsy (23%). We highlight novel clinical characteristics, such as learning disabilities without ID (30%) and feeding difficulties during infancy (18%). We further describe the varied dysmorphic features (67%) and present the changes in weight over time of 27 patients. We show that patients harboring highly clustered missense variants in the 2-3-ZNF domains are not clinically distinguishable from patients with truncating variants. We provide an updated overview of clinical and genetic data of the MYT1L-associated neurodevelopmental disorder, hence improving diagnosis and clinical management of these patients.

Published
2022
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