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6 results on '"Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254)"'

1. Bi-allelic variants in DOHH, catalyzing the last step of hypusine biosynthesis, are associated with a neurodevelopmental disorder

Author

Ziegler, Alban, Steindl, Katharina, Hanner, Ashleigh S, Kumar Kar, Rajesh, Prouteau, Clément, Boland, Anne, Deleuze, Jean Francois, Coubes, Christine, Bézieau, Stéphane, Küry, Sébastien, Maystadt, Isabelle, Le Mao, Morgane, Lenaers, Guy, Navet, Benjamin, Faivre, Laurence, Tran Mau-Them, Frédéric, Zanoni, Paolo, Chung, Wendy K, Rauch, Anita, Bonneau, Dominique, Park, Myung Hee, University of Zurich, Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), MitoVasc - Physiopathologie Cardiovasculaire et Mitochondriale (MITOVASC), Université d'Angers (UA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Universität Zürich [Zürich] = University of Zurich (UZH), Centre National de Recherche en Génomique Humaine (CNRGH), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de Génotypage (CNG), Institut de Génomique d'Evry (IG), Université Paris-Saclay-Institut de Biologie François JACOB (JACOB), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CHU Montpellier, Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), unité de recherche de l'institut du thorax UMR1087 UMR6291 (ITX), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE), Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Santé, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Centre hospitalier universitaire de Nantes (CHU Nantes), Centre de Génétique Humaine [Charleroi, Belgium] (Institut de Pathologie et de Génétique), Institut de Pathologie et de Génétique, Charleroi, Immunomodulation of the Tumor Microenvironment and Immunotherapy of Thoracic Cancers (CRCI2NA / Eq 1), Centre de Recherche en Cancérologie et Immunologie Intégrée Nantes-Angers (CRCI2NA ), Université d'Angers (UA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Université d'Angers (UA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université - UFR de Médecine et des Techniques Médicales (Nantes Univ - UFR MEDECINE), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), University hospital of Zurich [Zurich], Columbia University Medical Center (CUMC), and Columbia University [New York]

Subjects
DHPS, 10039 Institute of Medical Genetics, Lysine, [SDV]Life Sciences [q-bio], deoxyhypusine hydroxylase, DOHH, Gene Expression, translation, 610 Medicine & health, neurodevelopmental disorder, hypusine, Mixed Function Oxygenases, post, translational modification, Neurodevelopmental Disorders, Report, EIF5A1, Genetics, Humans, 570 Life sciences, biology, eIF5A, microcephaly, Alleles, Genetics (clinical)
Abstract

Deoxyhypusine hydroxylase (DOHH) is the enzyme catalyzing the second step in the post-translational synthesis of hypusine [N(ε)-(4-amino-2-hydroxybutyl)lysine] in the eukaryotic initiation factor 5A (eIF5A). Hypusine is formed exclusively in eIF5A by two sequential enzymatic steps catalyzed by deoxyhypusine synthase (DHPS) and deoxyhypusine hydroxylase (DOHH). Hypusinated eIF5A is essential for translation and cell proliferation in eukaryotes, and all three genes encoding eIF5A, DHPS, and DOHH are highly conserved throughout eukaryotes. Pathogenic variants affecting either DHPS or EIF5A have been previously associated with neurodevelopmental disorders. Using trio exome sequencing, we identified rare bi-allelic pathogenic missense and truncating DOHH variants segregating with disease in five affected individuals from four unrelated families. The DOHH variants are associated with a neurodevelopmental phenotype that is similar to phenotypes caused by DHPS or EIF5A variants and includes global developmental delay, intellectual disability, facial dysmorphism, and microcephaly. A two-dimensional gel analyses revealed the accumulation of deoxyhypusine-containing eIF5A [eIF5A(Dhp)] and a reduction in the hypusinated eIF5A in fibroblasts derived from affected individuals, providing biochemical evidence for deficiency of DOHH activity in cells carrying the bi-allelic DOHH variants. Our data suggest that rare bi-allelic variants in DOHH result in reduced enzyme activity, limit the hypusination of eIF5A, and thereby lead to a neurodevelopmental disorder.

Published
2022

2. Heterozygous Variants in KDM4B Lead to Global Developmental Delay and Neuroanatomical Defects

Author

Cyril Goizet, Arthur Sorlin, Antonio Novelli, Christophe Philippe, Mathilde Nizon, Joan M. Stoler, Maria J. Guillen Sacoto, Marielle Alders, Grace Yoon, Binnaz Yalcin, Aurélien Trimouille, Anna R. Duncan, Valerie E. Vancollie, Emanuele Agolini, Lance H. Rodan, Monica H. Wojcik, Christopher J. Lelliott, Saskia M. Maas, Antonio Vitobello, Pankaj B. Agrawal, Ange Line Bruel, Laurence Faivre, Paolo Prontera, Stephan C. Collins, Teresa Santiago-Sim, Casie A. Genetti, Ann Seman, Jiahai Shi, Marieke F. van Dooren, Patricia Ellen Grant, Clinical Genetics, Boston Children's Hospital, Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Equipe GAD (LNC - U1231), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut Agro Dijon, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut Agro Dijon, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), FHU TRANSLAD (CHU de Dijon), The Wellcome Trust Sanger Institute [Cambridge], City University of Hong Kong [Hong Kong] (CUHK), Bambino Gesù Children’s Hospital [Rome, Italy], Università degli Studi di Perugia = University of Perugia (UNIPG), GeneDx [Gaithersburg, MD, USA], Service de génétique médicale, Université de Bordeaux (UB)-CHU Bordeaux [Bordeaux]-Groupe hospitalier Pellegrin, Centre hospitalier universitaire de Nantes (CHU Nantes), Erasmus University Medical Center [Rotterdam] (Erasmus MC), Amsterdam UMC - Amsterdam University Medical Center, Centre de référence des maladies rares des déficiences intellectuelles de causes rares (CHU Dijon) (CRMR des déficiences intellectuelles de causes rares), The Hospital for sick children [Toronto] (SickKids), Dupuis, Christine, Human Genetics, Amsterdam Neuroscience - Cellular & Molecular Mechanisms, ACS - Pulmonary hypertension & thrombosis, Amsterdam Reproduction & Development (AR&D), Lelliott, Christopher [0000-0001-8087-4530], and Apollo - University of Cambridge Repository

Subjects
0301 basic medicine, Male, Jumonji Domain-Containing Histone Demethylases, [SDV]Life Sciences [q-bio], Developmental Disabilities, Corpus callosum, Hippocampus, Epigenesis, Genetic, Histones, Mice, 0302 clinical medicine, Neurodevelopmental disorder, Polymicrogyria, Global developmental delay, Agenesis of the corpus callosum, Genetics (clinical), Brain, Magnetic Resonance Imaging, [SDV] Life Sciences [q-bio], intellectual disability, Brain size, Female, dysmorphic hippocampi, Signal Transduction, Heterozygote, heterozygous variant, global developmental delay, Biology, Nervous System Malformations, Methylation, 03 medical and health sciences, Seizures, Report, KDM4B, Genetics, medicine, Animals, Humans, neurodevelopmental disorder, Dentate gyrus, Genetic Variation, JMJD2B, medicine.disease, 030104 developmental biology, agenesis of the corpus callosum, Neuroscience, Protein Processing, Post-Translational, 030217 neurology & neurosurgery, Ventriculomegaly
Abstract

International audience; KDM4B is a lysine-specific demethylase with a preferential activity on H3K9 tri/di-methylation (H3K9me3/2)-modified histones. H3K9 tri/di-demethylation is an important epigenetic mechanism responsible for silencing of gene expression in animal development and cancer. However, the role of KDM4B on human development is still poorly characterized. Through international data sharing, we gathered a cohort of nine individuals with mono-allelic de novo or inherited variants in KDM4B. All individuals presented with dysmorphic features and global developmental delay (GDD) with language and motor skills most affected. Three individuals had a history of seizures, and four had anomalies on brain imaging ranging from agenesis of the corpus callosum with hydrocephalus to cystic formations, abnormal hippocampi, and polymicrogyria. In mice, lysine demethylase 4B is expressed during brain development with high levels in the hippocampus, a region important for learning and memory. To understand how KDM4B variants can lead to GDD in humans, we assessed the effect of KDM4B disruption on brain anatomy and behavior through an in vivo heterozygous mouse model (Kdm4b þ/À), focusing on neuroanatomical changes. In mutant mice, the total brain volume was significantly reduced with decreased size of the hippocampal dentate gyrus, partial agenesis of the corpus callosum, and ventriculomegaly. This report demonstrates that variants in KDM4B are associated with GDD/ intellectual disability and neuroanatomical defects. Our findings suggest that KDM4B variation leads to a chromatinopathy, broadening the spectrum of this group of Mendelian disorders caused by alterations in epigenetic machinery.

Published
2020

3. NR2F1 regulates regional progenitor dynamics in the mouse neocortex and cortical gyrification in BBSOAS patients

Author

Laurence Perrin, Silvia Cappello, Francesco Neri, Arthur Sorlin, Philippe Khau Van Kien, Ludovico D'Incerti, Françoise Devillard, Rossella Di Giaimo, Paul Kuentz, Agnès Loubat, Marjolaine Willems, Laurence Faivre, Frédéric Tran Mau-Them, Salvatore Oliviero, Michèle Studer, Anna Lisa Romano, Christophe Philippe, Michele Bertacchi, Carolina Frassoni, Aurore Garde, Institut de Biologie Valrose (IBV), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Equipe GAD (LNC - U1231), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Santé et de la Recherche Médicale (INSERM), Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), CHU Montpellier, Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Hôpital Universitaire Carémeau [Nîmes] (CHU Nîmes), Centre Hospitalier Universitaire de Nîmes (CHU Nîmes), Hôpital Robert Debré Paris, Hôpital Robert Debré, Département de génétique et procréation, Université Joseph Fourier - Grenoble 1 (UJF)-Hôpital Couple-Enfant, Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Santé et de la Recherche Médicale (INSERM), Génétique biologique histologie [CHRU de Besançon], Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), Leibniz Institute on Aging - Fritz Lipmann Institute (FLI), Leibniz Association, Université de Naples, Max Planck Institute of Psychiatry, Max-Planck-Gesellschaft, Fondazione IRCCS Istituto Neurologico 'Carlo Besta', Bertacchi, Michele, Romano, Anna Lisa, Loubat, Agnè, Tran Mau-Them, Frederic, Willems, Marjolaine, Faivre, Laurence, Khau van Kien, Philippe, Perrin, Laurence, Devillard, Françoise, Sorlin, Arthur, Kuentz, Paul, Philippe, Christophe, Garde, Aurore, Neri, Francesco, Di Giaimo, Rossella, Oliviero, Salvatore, Cappello, Silvia, D'Incerti, Ludovico, Frassoni, Carolina, and Studer, Michèle

Subjects
cell cycle dynamics, PAX6 Transcription Factor, [SDV]Life Sciences [q-bio], cell cycle dynamic, Neocortex, Biology, Regenerative Medicine, Article, General Biochemistry, Genetics and Molecular Biology, Mice, 03 medical and health sciences, 0302 clinical medicine, Neurodevelopmental disorder, Neural Stem Cells, Optic Atrophies, Hereditary, Parietal Lobe, Cortex (anatomy), BBSOAS, medicine, Animals, Humans, Molecular Biology, Gyrification, 030304 developmental biology, 0303 health sciences, COUP Transcription Factor I, General Immunology and Microbiology, General Neuroscience, Neurogenesis, Articles, Human brain, NR2F1/COUP-TFI, cortical folding, medicine.disease, Disease Models, Animal, neurodevelopmental disease, medicine.anatomical_structure, NR2F1/COUP‐TFI, Occipital Lobe, PAX6, Haploinsufficiency, Development & Differentiation, Neuroscience, 030217 neurology & neurosurgery
Abstract

The relationships between impaired cortical development and consequent malformations in neurodevelopmental disorders, as well as the genes implicated in these processes, are not fully elucidated to date. In this study, we report six novel cases of patients affected by BBSOAS (Boonstra‐Bosch‐Schaff optic atrophy syndrome), a newly emerging rare neurodevelopmental disorder, caused by loss‐of‐function mutations of the transcriptional regulator NR2F1. Young patients with NR2F1 haploinsufficiency display mild to moderate intellectual disability and show reproducible polymicrogyria‐like brain malformations in the parietal and occipital cortex. Using a recently established BBSOAS mouse model, we found that Nr2f1 regionally controls long‐term self‐renewal of neural progenitor cells via modulation of cell cycle genes and key cortical development master genes, such as Pax6. In the human fetal cortex, distinct NR2F1 expression levels encompass gyri and sulci and correlate with local degrees of neurogenic activity. In addition, reduced NR2F1 levels in cerebral organoids affect neurogenesis and PAX6 expression. We propose NR2F1 as an area‐specific regulator of mouse and human brain morphology and a novel causative gene of abnormal gyrification., Reduced levels of the neuronal differentiation factor NR2F1/COUP‐TFI impairs brain cortex folding in humans, and disrupts regional neural progenitor dynamics in the neocortex of a BBSOAS disease mouse model.

Published
2020

4. De novo TBR1 variants cause a neurocognitive phenotype with ID and autistic traits: report of 25 new individuals and review of the literature

Author

Nambot, Sophie, Faivre, Laurence, Mirzaa, Ghayda, Thevenon, Julien, Bruel, Ange-Line, Mosca-Boidron, Anne-Laure, Masurel-Paulet, Alice, Goldenberg, Alice, Le Meur, Nathalie, Charollais, Aude, Mignot, Cyril, Petit, Florence, Rossi, Massimiliano, Metreau, Julia, Layet, Valérie, Amram, Daniel, Boute-Bénéjean, Odile, Bhoj, Elizabeth, Cousin, Margot, Kruisselbrink, Teresa, Lanpher, Brendan, Klee, Eric, Fiala, Elise, Grange, Dorothy, Meschino, Wendy, Hiatt, Susan, Cooper, Gregory, Olivié, Hilde, Smith, Wendy, Dumas, Meghan, Lehman, Anna, Inglese, Cara, Nizon, Mathilde, Guerrini, Renzo, Vetro, Annalisa, Kaplan, Eitan, Miramar, Dolores, van Gils, Julien, Fergelot, Patricia, Bodamer, Olaf, Herkert, Johanna, Pajusalu, Sander, Õunap, Katrin, Filiano, James, Smol, Thomas, Piton, Amélie, Gérard, Bénédicte, Chantot-Bastaraud, Sandra, Bienvenu, Thierry, Li, Dong, Juusola, Jane, Devriendt, Koen, Bilan, Frederic, Poé, Charlotte, Chevarin, Martin, Jouan, Thibaud, Tisserant, Emilie, Rivière, Jean-Baptiste, Tran Mau-Them, Frédéric, Philippe, Christophe, Duffourd, Yannis, Dobyns, William, Hevner, Robert, Thauvin-Robinet, Christel, Couvet, Sandrine, Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, FHU TRANSLAD (CHU de Dijon), Center for Integrative Brain Research [Seattle, WA, USA], University of Washington [Seattle]-Seattle Children's Research Institute, Department of Pediatrics [Seattle], University of Washington [Seattle], Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), Département de génétique [CHU Rouen] (Centre Normandie de Génomique et de Médecine Personnalisée), CHU Rouen, Normandie Université (NU)-Normandie Université (NU), Service de pédiatrie médicale et médecine de l'adolescent [Rouen], Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Service de génétique et embryologie médicales [CHU Trousseau], CHU Trousseau [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Clinique de Génétique médicale Guy Fontaine [CHRU LIlle], Service de Génétique [CHU Lyon] (Centre de pathologie de l'Est), Hospices civils de Lyon (HCL), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (CRNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Genetics of Neurodevelopment (GENDEV), Université de Lyon-Université de Lyon-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Service de Neurologie Pédiatrique [CHU Bicêtre], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Bicêtre, Département de génétique (groupe hospitalier le Havre), Groupe Hospitalier du Havre, Centre Hospitalier Intercommunal de Créteil (CHIC), Department of Pediatrics [Philadelphia, PA, USA] (Division of Genetics), Children’s Hospital of Philadelphia (CHOP ), The Center for Applied Genomics [Philadelphia, PA, USA], Mayo Clinic [Rochester], Department of Pediatrics [Saint Louis, MO, USA] (Division of Genetics and Genomic Medicine), Washington University in Saint Louis (WUSTL), Department of Genetics [Saint-Louis], HudsonAlpha Institute for Biotechnology [Huntsville, AL], University Hospitals Leuven [Leuven], Maine Medical Center, University of British Columbia [Vancouver], Service de génétique médicale - Unité de génétique clinique [Nantes], Université de Nantes (UN)-Centre hospitalier universitaire de Nantes (CHU Nantes), Meyer Children's Hospital [Florence, Italie], Università degli Studi di Firenze = University of Florence (UniFI), CHU Bordeaux [Bordeaux], Department of Genetics [Boston], Harvard Medical School [Boston] (HMS), University Medical Center Groningen [Groningen] (UMCG), University of Tartu, Dartmouth Hitchcock Medical Center [Lebanon, NH, USA] (DHMC), Service de Génétique Médicale [Lille], Institut de génétique médicale-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Laboratoire de Diagnostic Génétique [CHU Strasbourg], Université de Strasbourg (UNISTRA)-CHU Strasbourg, Maladies génétiques d'expression pédiatrique [CHU Trousseau] (Inserm U933), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Trousseau [APHP], UF de Génétique chromosomique [CHU Trousseau], Service de Génétique et Biologie Moléculaires [CHU Cochin], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Cochin [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), GeneDx [Gaithersburg, MD, USA], Service Génétique Médicale [CHU Poitiers], Centre hospitalier universitaire de Poitiers (CHU Poitiers), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut Agro Dijon, and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Proband, Candidate gene, INTELLECTUAL DISABILITY, MESH: Hippocampus, [SDV]Life Sciences [q-bio], MESH: Cognition, MESH: Neocortex, MESH: Child, Intellectual disability, MESH: Craniofacial Abnormalities, MESH: Animals, MESH: Syndrome, Genetics (clinical), Genetics, PROGENITORS, biology, Phenotype, NEOCORTEX, [SDV] Life Sciences [q-bio], EXPRESSION, GENES, MESH: Mutation, MESH: T-Box Domain Proteins, MESH: Autistic Disorder, [SDV.GEN.GH] Life Sciences [q-bio]/Genetics/Human genetics, MESH: Phenotype, Article, REGION, MESH: Intellectual Disability, NEUROGENESIS, Dysgenesis, FEZF2, medicine, MESH: Mice, MESH: Adolescent, MESH: Humans, MUTATIONS, business.industry, MESH: Child, Preschool, MESH: Adult, medicine.disease, MESH: Male, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, biology.protein, Autism, TBR1, business, Neurocognitive, MESH: Female
Abstract

International audience; TBR1, a T-box transcription factor expressed in the cerebral cortex, regulates the expression of several candidate genes for autism spectrum disorders (ASD). Although TBR1 has been reported as a high-confidence risk gene for ASD and intellectual disability (ID) in functional and clinical reports since 2011, TBR1 has only recently been recorded as a human disease gene in the OMIM database. Currently, the neurodevelopmental disorders and structural brain anomalies associated with TBR1 variants are not well characterized. Through international data sharing, we collected data from 25 unreported individuals and compared them with data from the literature. We evaluated structural brain anomalies in seven individuals by analysis of MRI images, and compared these with anomalies observed in TBR1 mutant mice. The phenotype included ID in all individuals, associated to autistic traits in 76% of them. No recognizable facial phenotype could be identified. MRI analysis revealed a reduction of the anterior commissure and suggested new features including dysplastic hippocampus and subtle neocortical dysgenesis. This report supports the role of TBR1 in ID associated with autistic traits and suggests new structural brain malformations in humans. We hope this work will help geneticists to interpret TBR1 variants and diagnose ASD probands.

Published
2020

5. TBL1XR1 mutations in Pierpont syndrome are not restricted to the recurrent p.Tyr446Cys mutation

Author

Julien Thevenon, David Geneviève, Laurence Faivre, C. F. Wells, Yannis Duffourd, camille lemattre, B. Vuadelle, Sophie Nambot, Marjolaine Willems, Paul Kuentz, Emmanuelle Haquet, Pierre Sarda, Ange-Line Bruel, Service de génétique médicale [Montpellier], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-Hôpital Arnaud de Villeneuve, Equipe GAD (LNC - U1231), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Service de génétique et procréation (Grenoble), Centre Hospitalier Universitaire [Grenoble] (CHU), Université Bourgogne Franche-Comté [COMUE] (UBFC), Orphanomix, Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), FHU TRANSLAD (CHU de Dijon), Lycée Philippe Lamour (Nîmes), Cellules Souches, Plasticité Cellulaire, Médecine Régénératrice et Immunothérapies (IRMB), Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Laboratoire de Biologie Moléculaire ( CHRU Saint‐Jacques, Besançon), and Hôpital Saint-Jacques [CHRU de Besançon]

Subjects
Male, 0301 basic medicine, Adolescent, Genotype, Receptors, Cytoplasmic and Nuclear, Biology, 03 medical and health sciences, 0302 clinical medicine, PIERPONT SYNDROME, Genetics, Humans, TBL1XR1, Missense mutation, Abnormalities, Multiple, Recurrent mutation, Genetic Testing, Alleles, Genetics (clinical), Exome sequencing, Loss function, Ultrasonography, Comparative Genomic Hybridization, [SDV.GEN]Life Sciences [q-bio]/Genetics, Brain, Facies, Nuclear Proteins, Syndrome, Magnetic Resonance Imaging, Phenotype, 3. Good health, Repressor Proteins, 030104 developmental biology, Amino Acid Substitution, 030220 oncology & carcinogenesis, Mutation, Mutation (genetic algorithm), Pierpont syndrome
Abstract

IF 2.264; International audience; Pierpont syndrome is a rare and sporadic syndrome, including developmental delay, facial characteristics, and abnormal extremities. Recently, a recurrent de novo TBL1XR1 variant (c.1337A > G; p.Tyr446Cys) has been identified in eight patients by whole‐exome sequencing. A dominant‐negative effect of this mutation is strongly suspected, since patients with TBL1XR1 deletion and other variants predicting loss of function do not share the same phenotype. We report two patients with typical Pierpont‐like syndrome features. Exome sequencing allowed identifying a de novo heterozygous missense TBL1XR1 variant in both patients, different from those already reported: p.Cys325Tyr and p.Tyr446His. The localization of these mutations and clinical features of Pierpont‐like syndrome suggest that their functional consequences are comparable with the recurrent mutation previously described, and provided additional data to understand molecular mechanisms of TBL1XR1 anomalies.

Published
2018

6. 2.5 years’ experience of GeneMatcher data-sharing: a powerful tool for identifying new genes responsible for rare diseases

Author

Bruel, Ange-Line, Vitobello, Antonio, Mau-Them, Frédéric Tran, Nambot, Sophie, Duffourd, Yannis, Quéré, Virginie, Kuentz, Paul, Garret, Philippine, Thevenon, Julien, Moutton, Sébastien, Lehalle, Daphne, Jean-Marçais, Nolwenn, Orphanomix Physicians’ Group,, Garde, Aurore, Delanne, Julian, Lefebvre, Mathilde, Lecoquierre, François, Trost, Detlef, Cho, Megan, Begtrup, Amber, Telegrafi, Aida, Vabres, Pierre, Mosca-Boidron, Anne-Laure, Callier, Patrick, Philippe, Christophe, Faivre, Laurence, Thauvin-Robinet, Christel, Equipe GAD (LNC - U1231), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon) (UF6254), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), FHU TRANSLAD (CHU de Dijon), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Université Bourgogne Franche-Comté [COMUE] (UBFC), Laboratoire CERBA, GeneDx [Gaithersburg, MD, USA], and Service de Dermatologie (CHU de Dijon)

Subjects
0301 basic medicine, Candidate gene, Computational biology, Disease, 030105 genetics & heredity, Biology, 03 medical and health sciences, Rare Diseases, Exome Sequencing, Intellectual disability, medicine, Humans, data-sharing, Genetic Testing, Gene, Genetics (clinical), Exome sequencing, Disease gene, Information Dissemination, GeneMatcher, medicine.disease, Disease gene identification, 3. Good health, Data sharing, 030104 developmental biology, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, NGS, Software
Abstract

Exome sequencing (ES) powerfully identifies the molecular bases of heterogeneous conditions such as intellectual disability and/or multiple congenital anomalies (ID/MCA). Current ES analysis, combining diagnosis analysis restricted to disease-causing genes reported in OMIM database and subsequent research investigation extended to other genes, indicated causal and candidate genes around 40% and 10%. Nonconclusive results are frequent in such ultrarare conditions that recurrence and genotype-phenotype correlations are limited. International data-sharing permits the gathering of additional patients carrying variants in the same gene to draw definitive conclusions on their implication as disease causing. Several web-based tools have been developed and grouped in Matchmaker Exchange. In this study, we report our current experience as a regional center that has implemented ES as a first-line diagnostic test since 2013, working with a research laboratory devoted to disease gene identification. We used GeneMatcher over 2.5 years to share 71 novel candidate genes identified by ES. Matches occurred in 60/71 candidate genes allowing to confirm the implication of 39% of matched genes as causal and to rule out 6% of them. The introduction of user-friendly gene-matching tools, such as GeneMatcher, appeared to be an essential step for the rapid identification of novel disease genes responsible for ID/MCA.

Published
2019

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