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Yue F, Jiang Y, Pan Y, Li L, Li L, Liu R, Wang R. Molecular cytogenetic characterization of partial monosomy 2p and trisomy 16q in a newborn: A case report. Exp Ther Med 2019; 18:1267-1275. [PMID: 31363371 PMCID: PMC6614715 DOI: 10.3892/etm.2019.7695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 05/16/2019] [Indexed: 11/24/2022] Open
Abstract
Trisomy 16q is a rare disorder with severe abnormalities, which always leads to early postnatal mortality. It usually results from a parental translocation, exhibiting 16q duplication associated with another chromosomal deletion. The present study reports on the clinical presentation and molecular cytogenetic results of a small-for-gestational-age infant, consisting of partial trisomy 16q21→qter and monosomy 2p25.3→pter. The proband presented with moderately low birthweight, small anterior fontanelles, prominent forehead, low hairline, telecanthus, flat nasal bridge, choanal atresia, clinodactyly of the fifth fingers, urogenital anomalies, congenital muscular torticollis and congenital laryngomalacia. The last two traits have not previously been reported in any trisomy 16q and monosomy 2p cases. The proband was trisomic for the 16q21→qter chromosomal region with the karyotype 46,XY,der(2)t(2;16)(p25;q21)pat. The chromosomal anomaly was the result of unbalanced segregation of a paternal balanced translocation, 46,XY,t(2;16)(p25;q21). In this case, molecular cytogenetic analysis had a critical role in delineating the proband's clinical phenotype. Although this patient had a 16q21→qter duplication and a 2p25.3→pter deletion, the latter may have had mild phenotypic effects when associated with trisomy 16q. The literature was also reviewed, focusing on cases with the same breakpoints, localizations and clinical features reported in recent years.
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Affiliation(s)
- Fagui Yue
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yuting Jiang
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Yuan Pan
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Leilei Li
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Linlin Li
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Ruizhi Liu
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Ruixue Wang
- Center for Reproductive Medicine and Center for Prenatal Diagnosis, The First Hospital, Jilin University, Changchun, Jilin 130021, P.R. China.,Jilin Engineering Research Center for Reproductive Medicine and Genetics, Jilin University, Changchun, Jilin 130021, P.R. China
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Goldenberg A, Riccardi F, Tessier A, Pfundt R, Busa T, Cacciagli P, Capri Y, Coutton C, Delahaye-Duriez A, Frebourg T, Gatinois V, Guerrot AM, Genevieve D, Lecoquierre F, Jacquette A, Khau Van Kien P, Leheup B, Marlin S, Verloes A, Michaud V, Nadeau G, Mignot C, Parent P, Rossi M, Toutain A, Schaefer E, Thauvin-Robinet C, Van Maldergem L, Thevenon J, Satre V, Perrin L, Vincent-Delorme C, Sorlin A, Missirian C, Villard L, Mancini J, Saugier-Veber P, Philip N. Clinical and molecular findings in 39 patients with KBG syndrome caused by deletion or mutation of ANKRD11. Am J Med Genet A 2016; 170:2847-2859. [PMID: 27605097 DOI: 10.1002/ajmg.a.37878] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 07/19/2016] [Indexed: 12/28/2022]
Abstract
KBG syndrome, due to ANKRD11 alteration is characterized by developmental delay, short stature, dysmorphic facial features, and skeletal anomalies. We report a clinical and molecular study of 39 patients affected by KBG syndrome. Among them, 19 were diagnosed after the detection of a 16q24.3 deletion encompassing the ANKRD11 gene by array CGH. In the 20 remaining patients, the clinical suspicion was confirmed by the identification of an ANKRD11 mutation by direct sequencing. We present arguments to modulate the previously reported diagnostic criteria. Macrodontia should no longer be considered a mandatory feature. KBG syndrome is compatible with autonomous life in adulthood. Autism is less frequent than previously reported. We also describe new clinical findings with a potential impact on the follow-up of patients, such as precocious puberty and a case of malignancy. Most deletions remove the 5'end or the entire coding region but never extend toward 16q telomere suggesting that distal 16q deletion could be lethal. Although ANKRD11 appears to be a major gene associated with intellectual disability, KBG syndrome remains under-diagnosed. NGS-based approaches for sequencing will improve the detection of point mutations in this gene. Broad knowledge of the clinical phenotype is essential for a correct interpretation of the molecular results. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Alice Goldenberg
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France.
| | - Florence Riccardi
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | - Aude Tessier
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Rolph Pfundt
- Afdeling Genetica, Radboud universitair medisch centrum, Nijmegen, Holland
| | - Tiffany Busa
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | | | - Yline Capri
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | - Charles Coutton
- Unité fonctionnelle de génétique chromosomique, Hôpital Couple-Enfant, CHU de Grenoble, Université de Grenoble Alpes, INSERM 1209, CNRS UMR 5309, Grenoble, France
| | - Andree Delahaye-Duriez
- Laboratoire d'histologie-embryologie-cytogénétique-BDR, Hôpital Jean Verdier, CHU de Paris Seine-Saint-Denis, APHP et Université Paris 13, Sorbonne Paris Cité, Bondy, France
| | - Thierry Frebourg
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Vincent Gatinois
- Laboratoire de génétique des maladies rares et auto-inflammatoires, Hôpital Arnaud de Villeneuve, CHRU de Montpellier, Montpellier, France
| | - Anne-Marie Guerrot
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - David Genevieve
- Département de génétique médicale, Hôpital Arnaud de Villeneuve, CHRU de Montpellier, Montpellier, France
| | - Francois Lecoquierre
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Aurélia Jacquette
- APHP, Département de Génétique, Centre de référence déficiences intellectuelles de Causes Rares, GRC UPMC "déficiences intellectuelles et autisme", Groupe Hospitalier Pitié Salpêtrière, Paris, France
| | - Philippe Khau Van Kien
- Unité fonctionnelle de génétique médicale et cytogénétique, Hôpital Caremeau, CHU de Nîmes, Nîmes, France
| | - Bruno Leheup
- Service de génétique clinique, Hôpital de Brabois, CHU de Nancy, Nancy, France
| | - Sandrine Marlin
- Service de génétique, Hôpital Necker-Enfants Malades, Paris, France
| | - Alain Verloes
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | - Vincent Michaud
- Service de génétique médicale, GH Pellegrin, CHU de Bordeaux, Bordeaux, France
| | - Gwenael Nadeau
- Unité fonctionnelle de cytogénétique, CH de Valence, Valence, France
| | - Cyril Mignot
- APHP, Département de Génétique, Centre de référence déficiences intellectuelles de Causes Rares, GRC UPMC "déficiences intellectuelles et autisme", Groupe Hospitalier Pitié Salpêtrière, Paris, France
| | - Philippe Parent
- Département de pédiatrie et génétique médicale, Hôpital Morvan, CHRU de Brest, Brest, France
| | - Massimiliano Rossi
- Service de génétique, Hôpital Femme-Mère-Enfant, GH Est, CHU de Lyon, Lyon, France
| | - Annick Toutain
- Service de génétique, Hôpital Bretonneau, CHRU de Tours, Tours, France
| | - Elise Schaefer
- Service de génétique médicale, Hôpital de Hautepierre, CHU de Strasbourg, Strasbourg, France
| | | | - Lionel Van Maldergem
- Centre de génétique humaine, Hôpital Saint-Jacques, CHRU de Besançon, Besançon, France
| | - Julien Thevenon
- Centre de génétique, Hôpital François Mitterrand, CHU Dijon Bourgogne, Dijon, France
| | - Véronique Satre
- Unité fonctionnelle de génétique chromosomique, Hôpital Couple-Enfant, CHU de Grenoble, Université de Grenoble Alpes, INSERM 1209, CNRS UMR 5309, Grenoble, France
| | - Laurence Perrin
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | | | - Arthur Sorlin
- Service de génétique clinique, Hôpital de Brabois, CHU de Nancy, Nancy, France
| | - Chantal Missirian
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | | | - Julien Mancini
- Aix Marseille Université, Inserm, IRD, UMR_S912, SESSTIM, Marseille, France.,APHM, Hôpital de la Timone, BiosTIC, Marseille, France
| | - Pascale Saugier-Veber
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Nicole Philip
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France.,Aix Marseille Université, INSERM, GMGF, Marseille, France
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De Rocker N, Vergult S, Koolen D, Jacobs E, Hoischen A, Zeesman S, Bang B, Béna F, Bockaert N, Bongers EM, de Ravel T, Devriendt K, Giglio S, Faivre L, Joss S, Maas S, Marle N, Novara F, Nowaczyk MJM, Peeters H, Polstra A, Roelens F, Rosenberg C, Thevenon J, Tümer Z, Vanhauwaert S, Varvagiannis K, Willaert A, Willemsen M, Willems M, Zuffardi O, Coucke P, Speleman F, Eichler EE, Kleefstra T, Menten B. Refinement of the critical 2p25.3 deletion region: the role of MYT1L in intellectual disability and obesity. Genet Med 2014; 17:460-6. [PMID: 25232846 DOI: 10.1038/gim.2014.124] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 08/07/2014] [Indexed: 01/04/2023] Open
Abstract
PURPOSE Submicroscopic deletions of chromosome band 2p25.3 are associated with intellectual disability and/or central obesity. Although MYT1L is believed to be a critical gene responsible for intellectual disability, so far no unequivocal data have confirmed this hypothesis. METHODS In this study we evaluated a cohort of 22 patients (15 sporadic patients and two families) with a 2p25.3 aberration to further refine the clinical phenotype and to delineate the role of MYT1L in intellectual disability and obesity. In addition, myt1l spatiotemporal expression in zebrafish embryos was analyzed by quantitative polymerase chain reaction and whole-mount in situ hybridization. RESULTS Complete MYT1L deletion, intragenic deletion, or duplication was observed in all sporadic patients, in addition to two patients with a de novo point mutation in MYT1L. The familial cases comprise a 6-Mb deletion in a father and his three children and a 5' MYT1L overlapping duplication in a father and his two children. Expression analysis in zebrafish embryos shows specific myt1l expression in the developing brain. CONCLUSION Our data strongly strengthen the hypothesis that MYT1L is the causal gene for the observed syndromal intellectual disability. Moreover, because 17 patients present with obesity/overweight, haploinsufficiency of MYT1L might predispose to weight problems with childhood onset.Genet Med 17 6, 460-466.
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Affiliation(s)
- Nina De Rocker
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Sarah Vergult
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - David Koolen
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Eva Jacobs
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Alexander Hoischen
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Susan Zeesman
- Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
| | - Birgitte Bang
- Paediatric Department, Copenhagen University Hospital, Herlev, Denmark
| | - Frédérique Béna
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Nele Bockaert
- Center for Developmental Disorders, Ghent University Hospital, Ghent, Belgium
| | - Ernie M Bongers
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Thomy de Ravel
- Center for Human Genetics, Leuven University Hospitals, KU Leuven, Leuven, Belgium
| | - Koenraad Devriendt
- Center for Human Genetics, Leuven University Hospitals, KU Leuven, Leuven, Belgium
| | - Sabrina Giglio
- Medical Genetics Unit, Meyer Children's University Hospital, Florence, Italy
| | - Laurence Faivre
- Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, Hôpital d'Enfants, CHU de Dijon, Dijon, France
| | - Shelagh Joss
- West of Scotland Regional Genetics Service, NHS Greater Glasgow and Clyde, Southern General Hospital, Glasgow, UK
| | - Saskia Maas
- Department of Clinical Genetics, Academic Medical Center, UVA, Amsterdam, The Netherlands
| | - Nathalie Marle
- Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, Hôpital d'Enfants, CHU de Dijon, Dijon, France
| | - Francesca Novara
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Malgorzata J M Nowaczyk
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Hilde Peeters
- Center for Human Genetics, Leuven University Hospitals, KU Leuven, Leuven, Belgium
| | - Abeltje Polstra
- Department of Clinical Genetics, Academic Medical Center, UVA, Amsterdam, The Netherlands
| | - Filip Roelens
- Heilig Hart Ziekenhuis Roeselare-Menen, Roeselare, Belgium
| | - Carla Rosenberg
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, São Paulo, Brazil
| | - Julien Thevenon
- Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs, Hôpital d'Enfants, CHU de Dijon, Dijon, France
| | - Zeynep Tümer
- Center for Applied Human Molecular Genetics, Kennedy Center, University of Copenhagen, Glostrup, Denmark
| | | | | | - Andy Willaert
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Marjolein Willemsen
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Marjolaine Willems
- Département de Génétique Clinique, CHRU de Montpellier, Hôpital Arnaud de Villeneuve, Montpellier, France
| | - Orsetta Zuffardi
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Paul Coucke
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Frank Speleman
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Evan E Eichler
- Howard Hughes Medical Institute, University of Washington, Seattle, Washington, USA
| | - Tjitske Kleefstra
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Björn Menten
- Center for Medical Genetics, Ghent University, Ghent, Belgium
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Doco-Fenzy M, Leroy C, Schneider A, Petit F, Delrue MA, Andrieux J, Perrin-Sabourin L, Landais E, Aboura A, Puechberty J, Girard M, Tournaire M, Sanchez E, Rooryck C, Ameil A, Goossens M, Jonveaux P, Lefort G, Taine L, Cailley D, Gaillard D, Leheup B, Sarda P, Geneviève D. Early-onset obesity and paternal 2pter deletion encompassing the ACP1, TMEM18, and MYT1L genes. Eur J Hum Genet 2013; 22:471-9. [PMID: 24129437 DOI: 10.1038/ejhg.2013.189] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 06/24/2013] [Accepted: 07/24/2013] [Indexed: 11/09/2022] Open
Abstract
Obesity is a common but highly, clinically, and genetically heterogeneous disease. Deletion of the terminal region of the short arm of chromosome 2 is rare and has been reported in about 13 patients in the literature often associated with a Prader-Willi-like phenotype. We report on five unrelated patients with 2p25 deletion of paternal origin presenting with early-onset obesity, hyperphagia, intellectual deficiency, and behavioural difficulties. Among these patients, three had de novo pure 2pter deletions, one presented with a paternal derivative der(2)t(2;15)(p25.3;q26) with deletion in the 2pter region and the last patient presented with an interstitial 2p25 deletion. The size of the deletions was characterized by SNP array or array-CGH and was confirmed by fluorescence in situ hybridization (FISH) studies. Four patients shared a 2p25.3 deletion with a minimal critical region estimated at 1.97 Mb and encompassing seven genes, namely SH3HYL1, ACP1, TMEMI8, SNTG2, TPO, PXDN, and MYT1L genes. The fifth patient had a smaller interstitial deletion encompassing the TPO, PXDN, and MYT1L genes. Paternal origin of the deletion was determined by genotyping using microsatellite markers. Analysis of the genes encompassed in the deleted region led us to speculate that the ACP1, TMEM18, and/or MYT1L genes might be involved in early-onset obesity. In addition, intellectual deficiency and behavioural troubles can be explained by the heterozygous loss of the SNTG2 and MYT1L genes. Finally, we discuss the parent-of-origin of the deletion.
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Affiliation(s)
- Martine Doco-Fenzy
- Service de Génétique, Hôpital Maison-Blanche, CHRU, UFR de Médecine, Reims, France
| | - Camille Leroy
- Service de Génétique, Hôpital Maison-Blanche, CHRU, UFR de Médecine, Reims, France
| | - Anouck Schneider
- Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France
| | | | - Marie-Ange Delrue
- Service de Génétique Médicale, Laboratoire MRGM, (EA 4576), CHRU de Bordeaux, Bordeaux, France
| | | | | | - Emilie Landais
- Service de Génétique, Hôpital Maison-Blanche, CHRU, UFR de Médecine, Reims, France
| | - Azzedine Aboura
- Fédération de Génétique, Hopital Robert Debré, APHP Paris, Paris, France
| | - Jacques Puechberty
- 1] Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France [2] Plateforme puce à ADN, CHRU Montpellier, Université Montpellier 1, Montpellier, France
| | - Manon Girard
- Plateforme puce à ADN, CHRU Montpellier, Université Montpellier 1, Montpellier, France
| | - Magali Tournaire
- Plateforme puce à ADN, CHRU Montpellier, Université Montpellier 1, Montpellier, France
| | - Elodie Sanchez
- Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France
| | - Caroline Rooryck
- Service de Génétique Médicale, Laboratoire MRGM, (EA 4576), CHRU de Bordeaux, Bordeaux, France
| | - Agnès Ameil
- Service de Pédiatrie, American Memorial Hospital, CHRU, Reims, France
| | - Michel Goossens
- Laboratoire de Génétique, AP-HP, et INSERM U-841, CHU Henri Mondor, Créteil, France
| | - Philippe Jonveaux
- Service de Génétique, CHRU de Nancy-Brabois, Inserm U954, Université de Lorraine, Nancy, France
| | - Geneviève Lefort
- 1] Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France [2] Plateforme puce à ADN, CHRU Montpellier, Université Montpellier 1, Montpellier, France
| | - Laurence Taine
- Service de Génétique Médicale, Laboratoire MRGM, (EA 4576), CHRU de Bordeaux, Bordeaux, France
| | - Dorothée Cailley
- Service de Génétique Médicale, Laboratoire MRGM, (EA 4576), CHRU de Bordeaux, Bordeaux, France
| | - Dominique Gaillard
- Service de Génétique, Hôpital Maison-Blanche, CHRU, UFR de Médecine, Reims, France
| | - Bruno Leheup
- CHU de Nancy, Pole Enfant, Service de génétique clinique, Vandoeuvre les nancy, F-54511, France
| | - Pierre Sarda
- Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France
| | - David Geneviève
- Département de Génétique Médicale, CHRU Montpellier, Faculté de Médecine de Montpellier-Nimes, Université Montpellier 1, Montpellier, France
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5
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Mundhofir FEP, Nillesen WM, Van Bon BWM, Smeets D, Pfundt R, van de Ven-Schobers G, Ruiterkamp-Versteeg M, Winarni TI, Hamel BCJ, Yntema HG, Faradz SMH. Subtelomeric chromosomal rearrangements in a large cohort of unexplained intellectually disabled individuals in Indonesia: A clinical and molecular study. INDIAN JOURNAL OF HUMAN GENETICS 2013; 19:171-8. [PMID: 24019618 PMCID: PMC3758723 DOI: 10.4103/0971-6866.116118] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
CONTEXT Unbalanced subtelomeric chromosomal rearrangements are often associated with intellectual disability (ID) and malformation syndromes. The prevalence of such rearrangements has been reported to be 5-9% in ID populations. AIMS To study the prevalence of subtelomeric rearrangements in the Indonesian ID population. MATERIALS AND METHODS We tested 436 subjects with unexplained ID using multiplex ligation dependent probe amplification (MLPA) using the specific designed sets of probes to detect human subtelomeric chromosomal imbalances (SALSA P070 and P036D). If necessary, abnormal findings were confirmed by other MLPA probe kits, fluorescent in situ hybridization or Single Nucleotide Polymorphism array. RESULTS A subtelomeric aberration was identified in 3.7% of patients (16/436). Details on subtelomeric aberrations and confirmation analyses are discussed. CONCLUSION This is the first study describing the presence of subtelomeric rearrangements in individuals with ID in Indonesia. Furthermore, it shows that also in Indonesia such abnormalities are a prime cause of ID and that in developing countries with limited diagnostic services such as Indonesia, it is important and feasible to uncover the genetic etiology in a significant number of cases with ID.
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Affiliation(s)
- Farmaditya E P Mundhofir
- Division of Human Genetics, Center for Biomedical Research, Faculty of Medicine Diponegoro University, Semarang, Indonesia ; Department of Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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6
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Molecular cytogenetic characterization of 2p23.2p23.3 deletion in a child with developmental delay, hypotonia and cryptorchism. Eur J Med Genet 2013; 56:62-5. [DOI: 10.1016/j.ejmg.2012.10.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 10/18/2012] [Indexed: 11/21/2022]
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7
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Germline mosaic transmission of a novel duplication of PXDN and MYT1L to two male half-siblings with autism. Psychiatr Genet 2012; 22:137-40. [PMID: 22157634 PMCID: PMC3309069 DOI: 10.1097/ypg.0b013e32834dc3f5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Autism is a neurodevelopmental disorder with a strong genetic component to susceptibility. In this study, we report the molecular characterization of an apparent de-novo 281 kb duplication of chromosome 2p25.3 in two male half-siblings with autism. The 2p25.3 duplication was first identified through a low-density microarray, validated with fluorescent in-situ hybridization, and duplication breakpoints were delineated using an Affymetrix 6.0 single-nucleotide polymorphism microarray. The fluorescent in-situ hybridization results validated the novel copy number variant and revealed the mother to be mosaic, with ∼33% of her lymphoblast cells carrying the duplication. Therefore, the duplication was transmitted through the mechanism of germline mosaicism. In addition, duplication breakpoints were refined and showed that PXDN is fully duplicated, whereas seven exons of the terminal portion of the 25 exon gene MYT1L are within the duplicated region. MYT1L, a gene predominately expressed in the brain, has recently been linked with other neuropsychiatric illness such as schizophrenia and depression. Results from this study indicate that the 2p25.3 duplication disrupting PXDN and MYT1L is a potential autism-causing variant in the pedigree reported here and should receive further consideration as a candidate for autism.
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De novo interstitial deletion of chromosome 2 (p23p24). Pediatr Neonatol 2011; 52:46-50. [PMID: 21385658 DOI: 10.1016/j.pedneo.2010.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 12/30/2009] [Accepted: 02/01/2010] [Indexed: 11/20/2022] Open
Abstract
Structural anomalies associated with partial 2p monosomy are rare. There has only been one case of interstitial deletion of 2p24.2-2p25.1 and three cases of 2p23.3-2p25.1 described in the literature. We report here the first instance of an interstitial deletion of 2p23p24, confirmed by comparative genome hybridization. We present a clinical and cytogenetic report of a patient with psychomotor retardation, hearing impairment, and limb abnormalities. The obvious osseous fusion with bone marrow and cortex continuation between proximal parts of radius and ulna-congenital radioulnar synostosis-were first visualized by multidetector-row computed tomography scan.
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Lo-Castro A, Giana G, Fichera M, Castiglia L, Grillo L, Musumeci SA, Galasso C, Curatolo P. Deletion 2p25.2: a cryptic chromosome abnormality in a patient with autism and mental retardation detected using aCGH. Eur J Med Genet 2008; 52:67-70. [PMID: 18992374 DOI: 10.1016/j.ejmg.2008.09.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Accepted: 09/24/2008] [Indexed: 11/20/2022]
Abstract
We describe a 7-year-old patient with autism, moderate mental retardation, secondary microcephaly, agenesis of right optic nerve, and dysmorphic features carrying a de novo cryptic deletion of chromosome 2p25.2, detected by aCGH. Pure monosomies of 2p are very rare, and are usually observed as part of more complex aberrations involving other chromosomes. To the best of our knowledge, this is the first case presenting with a severe clinical phenotype and a de novo pure deletion of 2p25.2. The phenotypic effects of this rearrangement and the role of SOX11 gene, removed in our case, are herein discussed.
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Bonaglia MC, Giorda R, Massagli A, Galluzzi R, Ciccone R, Zuffardi O. A familial inverted duplication/deletion of 2p25.1-25.3 provides new clues on the genesis of inverted duplications. Eur J Hum Genet 2008; 17:179-86. [PMID: 18813332 DOI: 10.1038/ejhg.2008.160] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
We studied a family in which the same 10 Mb inverted duplication of 2p25.3-p25.1 segregates in two children and their father, all showing a trisomy phenotype. As FISH analysis demonstrated that the duplication was inverted, we suspected that a contiguous terminal deletion was also present, according to the classical inv dup del type of rearrangements. Although FISH with 2p and 2q subtelomeric probes gave normal results, 100 kb resolution array-C/GH (aCGH) showed that, beside the duplication, a 273 kb deletion was also present. The presence of a single-copy region between the deleted and duplicated regions was further suspected through high-resolution aCGH analysis (approximately 20 kb), although only one informative spot having a normal log ratio was detected. The precise structure of the rearrangement was re-defined by real-time PCR and breakpoint cloning, demonstrating the presence of a 2680 bp single-copy sequence between deleted and duplicated regions and the involvement of a simple repeat with the potential for forming a non-B DNA structure. The rearrangement was not mediated by segmental duplications or short inverted repeats, and the double-strand break might have been repaired by non-homologous end joining or microhomology-mediated intrastrand repair. These data highlight the fact that concomitant deletions associated with inverted duplications are very likely to be more frequent than classical cytogenetic methods alone have been able to demonstrate. The phenotypic effects of the trisomy and of the terminal 2p deletion are discussed.
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