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El Khattabi L, Jaillard S, Andrieux J, Pasquier L, Perrin L, Capri Y, Benmansour A, Toutain A, Marcorelles P, Vincent-Delorme C, Journel H, Henry C, De Barace C, Devisme L, Dubourg C, Demurger F, Lucas J, Belaud-Rotureau MA, Amiel J, Malan V, De Blois MC, De Pontual L, Lebbar A, Le Dû N, Germain DP, Pinard JM, Pipiras E, Tabet AC, Aboura A, Verloes A. Clinical and molecular delineation of Tetrasomy 9p syndrome: report of 12 new cases and literature review. Am J Med Genet A 2015; 167:1252-61. [PMID: 25847481 DOI: 10.1002/ajmg.a.36932] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 12/03/2014] [Indexed: 11/12/2022]
Abstract
Tetrasomy 9p is a generic term describing the presence of a supernumerary chromosome incorporating two copies of the 9p arm. Two varieties exist: isodicentric chromosome 9p (i(9p)), where the two 9p arms are linked by a single centromeric region, and pseudodicentric 9p (idic(9p)), where one active and one inactive centromere are linked together by a proximal segment of 9q that may incorporate euchromatic material. In living patients, i(9p) and idic(9p) are usually present in a mosaic state. Fifty-four cases, including fetuses, have been reported, of which only two have been molecularly characterized using array-CGH. Tetrasomy 9p leads to a variable phenotype ranging from multiple congenital anomalies with severe intellectual disability and growth delay to subnormal cognitive and physical developments. Hypertelorism, abnormal ears, microretrognathia and bulbous nose are the most common dysmorphic traits. Microcephaly, growth retardation, joint dislocation, scoliosis, cardiac and renal anomalies were reported in several cases. Those physical anomalies are often, but not universally, accompanied by intellectual disability. The most recurrent breakpoints, defined by conventional cytogenetics, are 9p10, 9q12 and 9q13. We report on 12 new patients with tetrasomy 9p (3 i(9p), 8 idic(9p) and one structurally uncharacterized), including the first case of parental germline mosaicism. All rearrangements have been characterized by DNA microarray. Based on our results and a review of the literature, we further delineate the prenatal and postnatal clinical spectrum of this imbalance. Our results show poor genotype-phenotype correlations and underline the need of precise molecular characterization of the supernumerary marker.
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Affiliation(s)
- Laïla El Khattabi
- Cochin Institute, INSERM U1016, Paris, France.,Cytogenetics Department, APHP, Cochin Hospital, Paris Descartes University, Paris, France
| | - Sylvie Jaillard
- Cytogenetics and Cell Biology Department, Rennes University Hospital, Rennes, France
| | - Joris Andrieux
- Medical Genetics Department, Lille Hospital, Lille, France
| | - Laurent Pasquier
- Medical Genetics Department, Rennes University Hospital, Rennes, France
| | - Laurence Perrin
- Department of Genetics, APHP-Robert Debré University Hospital, Paris, France
| | - Yline Capri
- Department of Genetics, APHP-Robert Debré University Hospital, Paris, France
| | | | - Annick Toutain
- Department of Genetics, Tours University Hospital, Tours, France
| | | | | | | | - Catherine Henry
- Cytogenetics and Cell Biology Department, Rennes University Hospital, Rennes, France
| | - Claire De Barace
- Department of Pediatrics, Saint-Brieuc Hospital, Saint-Brieuc, France
| | - Louise Devisme
- Department of Anatomy and Cell Pathology, CHRU Lille, France
| | - Christèle Dubourg
- Molecular Genetics Department, Rennes University Hospital, Rennes, France.,UMR 6290, IGDR, Medical School, Rennes, France
| | - Florence Demurger
- Medical Genetics Department, Rennes University Hospital, Rennes, France
| | - Josette Lucas
- Cytogenetics and Cell Biology Department, Rennes University Hospital, Rennes, France
| | - Marc-Antoine Belaud-Rotureau
- Cytogenetics and Cell Biology Department, Rennes University Hospital, Rennes, France.,UMR 6290, IGDR, Medical School, Rennes, France
| | - Jeanne Amiel
- Department of Genetics, APHP, Necker-Enfants Malades University Hospital, Paris, France
| | - Valérie Malan
- Laboratory of Cytogenetics, APHP, Necker-Enfants Malades Hospital, Paris Descartes University, Paris, France
| | - Marie-Christine De Blois
- Laboratory of Cytogenetics, APHP, Necker-Enfants Malades Hospital, Paris Descartes University, Paris, France
| | - Loïc De Pontual
- Department of Pediatrics, Jean-Verdier Hospital, APHP, Paris 13 University, Bondy, France
| | - Aziza Lebbar
- Cytogenetics Department, APHP, Cochin Hospital, Paris Descartes University, Paris, France
| | - Nathalie Le Dû
- Cytogenetics Department, APHP, Cochin Hospital, Paris Descartes University, Paris, France
| | - Dominique P Germain
- Department of Genetics, Raymond Poincaré University Hospital, Garches, France
| | - Jean-Marc Pinard
- Department of Neuropediatrics, Raymond Poincaré University Hospital, Garches, France
| | - Eva Pipiras
- Cytogenetics, APHP, Jean-Verdier University Hospital, Bondy; Paris 13, Sorbonne Paris Cité, UFR SMBH, Bobigny, France; Inserm, U676, Paris, France
| | - Anne-Claude Tabet
- Department of Genetics, APHP-Robert Debré University Hospital, Paris, France
| | - Azzedine Aboura
- Department of Genetics, APHP-Robert Debré University Hospital, Paris, France
| | - Alain Verloes
- Department of Genetics, APHP-Robert Debré University Hospital, Paris, France.,INSERM U676, and Paris VII-Denis Diderot Medical School, Paris, France
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Tabet AC, Verloes A, Pilorge M, Delaby E, Delorme R, Nygren G, Devillard F, Gérard M, Passemard S, Héron D, Siffroi JP, Jacquette A, Delahaye A, Perrin L, Dupont C, Aboura A, Bitoun P, Coleman M, Leboyer M, Gillberg C, Benzacken B, Betancur C. Complex nature of apparently balanced chromosomal rearrangements in patients with autism spectrum disorder. Mol Autism 2015; 6:19. [PMID: 25844147 PMCID: PMC4384291 DOI: 10.1186/s13229-015-0015-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 03/06/2015] [Indexed: 12/21/2022] Open
Abstract
Background Apparently balanced chromosomal rearrangements can be associated with an abnormal phenotype, including intellectual disability and autism spectrum disorder (ASD). Genome-wide microarrays reveal cryptic genomic imbalances, related or not to the breakpoints, in 25% to 50% of patients with an abnormal phenotype carrying a microscopically balanced chromosomal rearrangement. Here we performed microarray analysis of 18 patients with ASD carrying balanced chromosomal abnormalities to identify submicroscopic imbalances implicated in abnormal neurodevelopment. Methods Eighteen patients with ASD carrying apparently balanced chromosomal abnormalities were screened using single nucleotide polymorphism (SNP) arrays. Nine rearrangements were de novo, seven inherited, and two of unknown inheritance. Genomic imbalances were confirmed by fluorescence in situ hybridization and quantitative PCR. Results We detected clinically significant de novo copy number variants in four patients (22%), including three with de novo rearrangements and one with an inherited abnormality. The sizes ranged from 3.3 to 4.9 Mb; three were related to the breakpoint regions and one occurred elsewhere. We report a patient with a duplication of the Wolf-Hirschhorn syndrome critical region, contributing to the delineation of this rare genomic disorder. The patient has a chromosome 4p inverted duplication deletion, with a 0.5 Mb deletion of terminal 4p and a 4.2 Mb duplication of 4p16.2p16.3. The other cases included an apparently balanced de novo translocation t(5;18)(q12;p11.2) with a 4.2 Mb deletion at the 18p breakpoint, a subject with de novo pericentric inversion inv(11)(p14q23.2) in whom the array revealed a de novo 4.9 Mb deletion in 7q21.3q22.1, and a patient with a maternal inv(2)(q14.2q37.3) with a de novo 3.3 Mb terminal 2q deletion and a 4.2 Mb duplication at the proximal breakpoint. In addition, we identified a rare de novo deletion of unknown significance on a chromosome unrelated to the initial rearrangement, disrupting a single gene, RFX3. Conclusions These findings underscore the utility of SNP arrays for investigating apparently balanced chromosomal abnormalities in subjects with ASD or related neurodevelopmental disorders in both clinical and research settings.
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Affiliation(s)
- Anne-Claude Tabet
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; INSERM, UMR 1130, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; CNRS, UMR 8246, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; Sorbonne Universités, UPMC Univ Paris 6, Institut de Biologie Paris-Seine, 9 quai Saint Bernard, 75005 Paris, France
| | - Alain Verloes
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; INSERM, UMR 1141, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Marion Pilorge
- INSERM, UMR 1130, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; CNRS, UMR 8246, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; Sorbonne Universités, UPMC Univ Paris 6, Institut de Biologie Paris-Seine, 9 quai Saint Bernard, 75005 Paris, France
| | - Elsa Delaby
- INSERM, UMR 1130, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; CNRS, UMR 8246, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; Sorbonne Universités, UPMC Univ Paris 6, Institut de Biologie Paris-Seine, 9 quai Saint Bernard, 75005 Paris, France
| | - Richard Delorme
- Department of Child and Adolescent Psychiatry, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; Fondation Fondamental, 40 rue de Mesly, 94000 Créteil, France
| | - Gudrun Nygren
- Gillberg Neuropsychiatry Centre, University of Gothenburg, Kungsgatan 12, 41119 Göteborg, Sweden
| | - Françoise Devillard
- Département de Génétique et Procréation, CHU de Grenoble, Hôpital Couple-Enfant, avenue du Maquis du Grésivaudan, 38043 Grenoble, France
| | - Marion Gérard
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Sandrine Passemard
- INSERM, UMR 1141, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; Neurology Unit, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Delphine Héron
- Medical Genetics Unit, AP-HP, Pitié-Salpêtrière University Hospital, 47 boulevard de l'Hôpital, 75013 Paris, France
| | - Jean-Pierre Siffroi
- Service de Génétique et d'Embryologie Médicales, AP-HP, Trousseau Hospital, 26 avenue du Docteur Arnold Netter, 75012 Paris, France
| | - Aurelia Jacquette
- Medical Genetics Unit, AP-HP, Pitié-Salpêtrière University Hospital, 47 boulevard de l'Hôpital, 75013 Paris, France
| | - Andrée Delahaye
- INSERM, UMR 1141, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; Cytogenetics Unit, AP-HP, Jean Verdier Hospital, allée du 14 Juillet, 93140 Bondy, France ; Paris 13 University, Sorbonne Paris Cité, UFR SMBH, 74 rue Marcel Cachin, 93000 Bobigny, France
| | - Laurence Perrin
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Céline Dupont
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Azzedine Aboura
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France
| | - Pierre Bitoun
- Medical Genetics Unit, AP-HP, Jean Verdier Hospital, allée du 14 Juillet, 93140 Bondy, France
| | - Mary Coleman
- Foundation for Autism Research, 3081 Quail Hollow, Sarasota, FL 34235 USA
| | - Marion Leboyer
- Fondation Fondamental, 40 rue de Mesly, 94000 Créteil, France ; Department of Psychiatry, AP-HP, Henri Mondor-Albert Chenevier Hospital, 40 rue de Mesly, 94000 Créteil, France ; INSERM U955, Institut Mondor de Recherche Biomédicale, Psychiatric Genetics, 8 rue du Général Sarrail, 94000 Créteil, France ; Faculty of Medicine, University Paris-Est Créteil, 8 rue du Général Sarrail, 94000 Créteil, France
| | - Christopher Gillberg
- Gillberg Neuropsychiatry Centre, University of Gothenburg, Kungsgatan 12, 41119 Göteborg, Sweden
| | - Brigitte Benzacken
- Department of Genetics, AP-HP, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; INSERM, UMR 1141, Robert Debré University Hospital, 48 boulevard Sérurier, 75019 Paris, France ; Cytogenetics Unit, AP-HP, Jean Verdier Hospital, allée du 14 Juillet, 93140 Bondy, France ; Paris 13 University, Sorbonne Paris Cité, UFR SMBH, 74 rue Marcel Cachin, 93000 Bobigny, France
| | - Catalina Betancur
- INSERM, UMR 1130, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; CNRS, UMR 8246, Neuroscience Paris Seine, 9 quai Saint Bernard, 75005 Paris, France ; Sorbonne Universités, UPMC Univ Paris 6, Institut de Biologie Paris-Seine, 9 quai Saint Bernard, 75005 Paris, France
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Chatron N, Haddad V, Andrieux J, Désir J, Boute O, Dieux A, Baumann C, Drunat S, Gérard M, Bonnet C, Leheup B, Till M, Rossi M, Flori E, Alembik Y, Stewart H, McParland J, Bernardini L, Castelluccio P, Roos L, Tümer Z, Fagan K, Hackett A, Bain N, van Haeringen A, Ruivenkamp C, Benzacken B, Sanlaville D, Edery P, Aboura A, Schluth-Bolard C. Refinement of genotype-phenotype correlation in 18 patients carrying a 1q24q25 deletion. Am J Med Genet A 2015; 167A:1008-17. [PMID: 25728055 DOI: 10.1002/ajmg.a.36856] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 10/07/2014] [Indexed: 11/10/2022]
Abstract
Interstitial deletion 1q24q25 is a rare rearrangement associated with intellectual disability, growth retardation, abnormal extremities and facial dysmorphism. In this study, we describe the largest series reported to date, including 18 patients (4M/14F) aged from 2 days to 67 years and comprising two familial cases. The patients presented with a characteristic phenotype including mild to moderate intellectual disability (100%), intrauterine (92%) and postnatal (94%) growth retardation, microcephaly (77%), short hands and feet (83%), brachydactyly (70%), fifth finger clinodactyly (78%) and facial dysmorphism with a bulbous nose (72%), abnormal ears (67%) and micrognathia (56%). Other findings were abnormal palate (50%), single transverse palmar crease (53%), renal (38%), cardiac (38%), and genital (23%) malformations. The deletions were characterized by chromosome microarray. They were of different sizes (490 kb to 20.95 Mb) localized within chromosome bands 1q23.3-q31.2 (chr1:160797550-192912120, hg19). The 490 kb deletion is the smallest deletion reported to date associated with this phenotype. We delineated three regions that may contribute to the phenotype: a proximal one (chr1:164,501,003-167,022,133), associated with cardiac and renal anomalies, a distal one (chr1:178,514,910-181,269,712) and an intermediate 490 kb region (chr1:171970575-172460683, hg19), deleted in the most of the patients, and containing DNM3, MIR3120 and MIR214 that may play an important role in the phenotype. However, this genetic region seems complex with multiple regions giving rise to the same phenotype.
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Affiliation(s)
- Nicolas Chatron
- Hospices Civils de Lyon, Service de Génétique, Laboratoire de Cytogénétique Constitutionnelle, Bron, France
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4
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Dupont C, Grati FR, Choy KW, Jaillard S, Toutain J, Maurin ML, Martínez-Conejero JA, Beneteau C, Coussement A, Molina-Gomes D, Horelli-Kuitunen N, Aboura A, Tabet AC, Besseau-Ayasse J, Bessieres-Grattagliano B, Simoni G, Ayala G, Benzacken B, Vialard F. Prenatal diagnosis of 24 cases of microduplication 22q11.2: an investigation of phenotype-genotype correlations. Prenat Diagn 2014; 35:35-43. [PMID: 25118001 DOI: 10.1002/pd.4478] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/29/2014] [Accepted: 08/06/2014] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Microduplication 22q11.2 is primarily characterized by a highly variable clinical phenotype, which ranges from apparently normal or slightly dysmorphic features (in the presence or absence of learning disorders) to severe malformations with profound mental retardation. Hence, genetic counseling is particularly challenging when microduplication 22q11.2 is identified in a prenatal diagnosis. Here, we report on 24 prenatal cases of microduplication 22q11.2. METHODS Seventeen of the cases were also reanalyzed by microarray analysis, in order to determine copy number variations (CNVs, which are thought to influence expressivity). We also searched for possible correlations between fetal phenotypes, indications for invasive prenatal diagnosis, inheritance, and pregnancy outcomes. RESULTS Of the 24 cases, 15 were inherited, six occurred de novo, and three were of unknown origin. Termination of pregnancy occurred in seven cases and was mainly decided on the basis of ultrasound findings. Moreover, additional CNVs were found in some patients and we try to make a genotype-phenotype correlation. CONCLUSION We discuss the complexity of genetic counseling for microduplication 22q11.2 and comment on possible explanations for the clinical heterogeneity of this syndrome. In particular, we assessed the co-existence of additional CNVs and their contribution to phenotypic variations in chromosome 22q11.2 microduplication syndrome.
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Affiliation(s)
- Céline Dupont
- Unité de Cytogénétique, Département de Génétique, Hôpital Robert Debré-AP-HP, CHU Paris, Paris, France
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5
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Quelin C, Spaggiari E, Khung-Savatovsky S, Dupont C, Pasquier L, Loeuillet L, Jaillard S, Lucas J, Marcorelles P, Journel H, Pluquailec-Bilavarn K, Bazin A, Verloes A, Delezoide AL, Aboura A, Guimiot F. Inversion duplication deletions involving the long arm of chromosome 13: phenotypic description of additional three fetuses and genotype-phenotype correlation. Am J Med Genet A 2014; 164A:2504-9. [PMID: 24975584 DOI: 10.1002/ajmg.a.36658] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 05/28/2014] [Indexed: 11/09/2022]
Abstract
Inversion duplication and terminal deletion of the long arm of chromosome 13 (inv dup del 13q) is a rare chromosomal rearrangement: only five patients have been reported, mostly involving a ring chromosome 13. We report on additional three fetuses with pure inv dup del 13q: Patient 1 had macrosomia, enlarged kidneys, hypersegmented lungs, unilateral moderate ventriculomegaly, and a mild form of hand and feet preaxial polydactyly; Patient 2 had intrauterine growth retardation, widely spaced eyes, left microphthalmia, right anophthalmia, short nose, bilateral absent thumbs, cutaneous syndactyly of toes 4 and 5, bifid third metacarpal, a small left kidney, hyposegmented lungs, and partial agenesis of the corpus callosum; Patient 3 had widely spaced eyes, long and smooth philtrum, low-set ears, median notch in the upper alveolar ridge, bifid tongue, cutaneous syndactyly of toes 2 and 3, enlarged kidneys and pancreas, arhinencephaly, and partial agenesis of the corpus callosum. We compared the phenotypes of these patients to those previously reported for ring chromosome 13, pure 13q deletions and duplications. We narrowed some critical regions previously reported for lung, kidney and fetal growth, and for thumb, cerebral, and eye anomalies.
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Affiliation(s)
- Chloe Quelin
- Department of Developmental Biology, AP-HP, Robert Debré University Hospital, Paris and Diderot University, Paris, France; Clinical Genetics Unit, Rennes Sud University Hospital, Rennes, France
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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7
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Dupont C, Baumann C, Le Du N, Schaefer E, Guimiot F, Boutaud L, Capri Y, Spaggiari E, Aboura A, Benzacken B, Tabet AC. COL2A1 gene disruption by a balanced translocation t(12;15)(q13;q22.2) in familial Stickler syndrome. Am J Med Genet A 2013; 161A:2663-5. [PMID: 23918474 DOI: 10.1002/ajmg.a.36081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 05/05/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Céline Dupont
- AP-HP, Department of Genetic-Cytogenetic Unit, Robert Debre Hospital, Paris, France
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8
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Marle N, Martinet D, Aboura A, Joly-Helas G, Andrieux J, Flori E, Puechberty J, Vialard F, Sanlaville D, Fert Ferrer S, Bourrouillou G, Tabet AC, Quilichini B, Simon-Bouy B, Bazin A, Becker M, Stora H, Amblard S, Doco-Fenzy M, Molina Gomes D, Girard-Lemaire F, Cordier MP, Satre V, Schneider A, Lemeur N, Chambon P, Jacquemont S, Fellmann F, Vigouroux-Castera A, Molignier R, Delaye A, Pipiras E, Liquier A, Rousseau T, Mosca AL, Kremer V, Payet M, Rangon C, Mugneret F, Aho S, Faivre L, Callier P. Molecular characterization of 39 de novo sSMC: contribution to prognosis and genetic counselling, a prospective study. Clin Genet 2013; 85:233-44. [PMID: 23489061 DOI: 10.1111/cge.12138] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 03/05/2012] [Accepted: 03/05/2012] [Indexed: 11/27/2022]
Abstract
Small supernumerary marker chromosomes (sSMCs) are structurally abnormal chromosomes that cannot be characterized by karyotype. In many prenatal cases of de novo sSMC, the outcome of pregnancy is difficult to predict because the euchromatin content is unclear. This study aimed to determine the presence or absence of euchromatin material of 39 de novo prenatally ascertained sSMC by array-comparative genomic hybridization (array-CGH) or single nucleotide polymorphism (SNP) array. Cases were prospectively ascertained from the study of 65,000 prenatal samples [0.060%; 95% confidence interval (CI), 0.042-0.082]. Array-CGH showed that 22 markers were derived from non-acrocentric markers (56.4%) and 7 from acrocentic markers (18%). The 10 additional cases remained unidentified (25.6%), but 7 of 10 could be further identified using fluorescence in situ hybridization; 69% of de novo sSMC contained euchromatin material, 95.4% of which for non-acrocentric markers. Some sSMC containing euchromatin had a normal phenotype (31% for non-acrocentric and 75% for acrocentric markers). Statistical differences between normal and abnormal phenotypes were shown for the size of the euchromatin material (more or less than 1 Mb, p = 0.0006) and number of genes (more or less than 10, p = 0.0009). This study is the largest to date and shows the utility of array-CGH or SNP array in the detection and characterization of de novo sSMC in a prenatal context.
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Affiliation(s)
- N Marle
- Département de Génétique, Hôpital Le Bocage, Université de Bourgogne, Dijon, France
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9
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Guimiot F, Dupont C, Fuentes-Duarte A, Aboura A, Bazin A, Khung-Savatovsky S, Tillous-Borde I, Delezoide AL, Azancot A. Maternal transmission of interstitial 8p23.1 deletion detected during prenatal diagnosis. Am J Med Genet A 2012; 161A:208-13. [PMID: 23239632 DOI: 10.1002/ajmg.a.35690] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 09/06/2012] [Indexed: 01/30/2023]
Abstract
We report on the first prenatally diagnosed interstitial 8p23.1 maternally inherited deletion. At 20 weeks of gestation (WG) the fetus was diagnosed with a complete atrioventricular canal. In infancy, the mother underwent a two-step cardiac surgery for an interrupted aortic arch type A associated to an inlet ventricular septal defect (VSD). A straddling of the tricuspid valve type B was confirmed during surgery. The outcome showed no cardiac failure or conduction anomalies. However, she presented with moderate intellectual disability. Classical and molecular cytogenetic studies on amniotic and maternal lymphocytes cells showed a nearly identical interstitial deletion of the 8p23.1 region encompassing the GATA4 gene locus (Mother: nt 6,913,337-12,580,828, fetus: nt 7,074,449-12,580,828) with no modification of the telomeric region. The relevance of our report is not only the maternal syndromic interstitial 8p23.1 deletion, but also maternal transmission which has never been reported before. The maternal and fetal phenotypes were not identical, however, even though they had the same cellular and molecular background: an alteration of the epithelial mesenchymal transition of the atrioventricular valvulo-septal complex where GATA4 plays a positive role in the regulation. We reviewed all cases of interstitial 8p23.1 deletions diagnosed either prenatally or postnatally.
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Affiliation(s)
- F Guimiot
- Department of Developmental Biology, Robert Debre Hospital, AP-HP, Paris, France.
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10
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Grati FR, Gomes DM, Ganesamoorthy D, Marcato L, De Toffol S, Blondeel E, Malvestiti F, Loeuillet L, Ruggeri AM, Wainer R, Maggi F, Aboura A, Dupont C, Tabet AC, Guimiot F, Slater HR, Simoni G, Vialard F. Application of a new molecular technique for the genetic evaluation of products of conception. Prenat Diagn 2012; 33:32-41. [DOI: 10.1002/pd.4004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Francesca R. Grati
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | | | - Devika Ganesamoorthy
- VCGS Cytogenetics Laboratory; Murdoch Children's Research Institute, Royal Children's Hospital; Melbourne; Australia
| | - Livia Marcato
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | - Simona De Toffol
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | | | - Francesca Malvestiti
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | | | - Anna Maria Ruggeri
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | | | - Federico Maggi
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
| | - Azzedine Aboura
- Département de Cytogénétique; Hôpital Robert Debré, GHU Nord; Paris; France
| | - Celine Dupont
- Département de Cytogénétique; Hôpital Robert Debré, GHU Nord; Paris; France
| | - Anne Claude Tabet
- Département de Cytogénétique; Hôpital Robert Debré, GHU Nord; Paris; France
| | | | - Howard R. Slater
- VCGS Cytogenetics Laboratory; Murdoch Children's Research Institute, Royal Children's Hospital; Melbourne; Australia
| | - Giuseppe Simoni
- Research and Development, Cytogenetics and Molecular Biology; TOMA Advanced Biomedical Assays; Busto Arsizio; Varese; Italy
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11
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Kaltenbach S, Capri Y, Rossignol S, Denjoy I, Soudée S, Aboura A, Baumann C, Verloes A. Beckwith-Wiedemann syndrome and long QT syndrome due to familial-balanced translocation t(11;17)(p15.5;q21.3) involving the KCNQ1 gene. Clin Genet 2012; 84:78-81. [PMID: 23061425 DOI: 10.1111/cge.12038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 10/05/2012] [Accepted: 10/05/2012] [Indexed: 12/31/2022]
Abstract
We report a child with Beckwith-Wiedemann syndrome (BWS) as the consequence of an apparently balanced, maternally inherited reciprocal translocation t(11;17)(p15.5;q21.3). His mother and aunt, who inherited the translocation from their father, did not have BWS. At birth, long QT syndrome (LQTS) was diagnosed in this child and, secondarily, among apparently healthy family members carrying the translocation. By FISH analysis, the breakpoint in 11p15.5 interrupts the KCNQ1 gene between exons 2 and 10 and causes a loss of methylation of the IC2 (and thus BWS) on the maternally inherited der(11) chromosome. To explain the presence of LQTS segregating with the t(11;17) translocation in this family, we hypothesize that the translocation that interrupts KCNQ1 allow translation of an abnormal short allele that interferes in a dominant negative way with the normal isoform 1 of KCNQ1 in the heart (where this allele is not subject to parental imprint). This appears to be the first report of BWS with congenital LQTS, which should be considered as a rare but serious complication to be searched systematically in patients with BWS due to 11p15 rearrangements.
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Affiliation(s)
- S Kaltenbach
- Department of Genetics, Robert Debré University Hospital, Paris, France
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12
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Delahaye A, Khung-Savatovsky S, Aboura A, Guimiot F, Drunat S, Alessandri JL, Gérard M, Bitoun P, Boumendil J, Robin S, Huel C, Guilherme R, Serero S, Gressens P, Elion J, Verloes A, Benzacken B, Delezoide AL, Pipiras E. Pre- and postnatal phenotype of 6p25 deletions involving the FOXC1 gene. Am J Med Genet A 2012; 158A:2430-8. [PMID: 22903608 DOI: 10.1002/ajmg.a.35548] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 06/06/2012] [Indexed: 01/14/2023]
Abstract
FOXC1 deletion, duplication, and mutations are associated with Axenfeld-Rieger anomaly, and Dandy-Walker malformation spectrum. We describe the clinical history, physical findings, and available brain imaging studies in three fetuses, two children, and one adult with 6p25 deletions encompassing FOXC1. Various combinations of ocular and cerebellar malformations were found. In all three fetuses, necropsy including detailed microscopic assessments of the eyes and brains showed ocular anterior segment dysgenesis suggestive of Axenfeld-Rieger anomaly. Five 6p25 deletions were terminal, including two derived from inherited reciprocal translocations; the remaining 6p25 deletion was interstitial. The size and breakpoints of these deletions were characterized using comparative genomic hybridization arrays. All six deletions included FOXC1. Our data confirm that FOXC1 haploinsufficiency plays a major role in the phenotype of patients with 6p25 deletions. Histopathological features of Axenfeld-Rieger anomaly were clearly identifiable before the beginning of the third-trimester of gestation.
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Affiliation(s)
- Andrée Delahaye
- AP-HP, Hôpital Jean Verdier, Service d'Histologie, Embryologie, et Cytogénétique, Bondy, France.
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13
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Rambaud J, Marey I, Dupont C, Perrin-Sabourin L, Capri Y, Tabet AC, Benzacken B, Verloes A, Aboura A, Gérard M. Nail and phalangeal agenesis in a patient with 4pter and 9pter duplication. Am J Med Genet A 2012; 158A:2277-82. [PMID: 22821638 DOI: 10.1002/ajmg.a.35494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2011] [Accepted: 05/06/2012] [Indexed: 11/10/2022]
Abstract
We report on an 8-month-old girl with intra-uterine growth retardation, microcephaly, incomplete cleft lip, axial hypotonia, failure to thrive, and brachydactyly type B (phalangeal agenesis and absence of nails). She carried a supernumerary marker chromosome derived from chromosomes 4 and 9, leading to 4pter-q12 and 9pter-p21.2 duplication. The marker was derived from the 3:1 segregation of a maternal balanced translocation 46,XX, t(4;9)(q12;p21.2). The proposita is the first reported individual with distal phalangeal agenesis and anonychia, and trisomy 4p and partial trisomy 9p due to 3:1 segregation of a maternal reciprocal translocation.
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Affiliation(s)
- Jérôme Rambaud
- Department of Genetics, APHP Robert Debré University Hospital, Paris, France.
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14
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Devernay M, Bolca D, Kerdjana L, Aboura A, Gérard B, Tabet AC, Benzacken B, Ecosse E, Coste J, Carel JC. Parental origin of the X-chromosome does not influence growth hormone treatment effect in Turner syndrome. J Clin Endocrinol Metab 2012; 97:E1241-8. [PMID: 22593588 DOI: 10.1210/jc.2011-3488] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT The parental origin of the intact X-chromosome has been reported to affect phenotype and response to GH treatment in Turner syndrome (TS). OBJECTIVE Our objective was to evaluate the influence of the parental origin of the X-chromosome on body growth and GH treatment effect in TS. DESIGN AND SETTING We conducted a population-based cohort study of TS patients previously treated with GH. PARTICIPANTS Participants included patients with a nonmosaic 45,X karyotype; 556 women were identified as eligible, 233 (49%) of whom participated, together with their mothers. Data were analyzed for 180 of these patients. MAIN OUTCOME MEASURES We performed fluorescence in situ hybridization analysis to exclude mosaicism and microsatellite analysis of nine polymorphic markers in DNA from the patients and their mothers. The influence on growth and effect of GH were analyzed by univariate and multivariate methods. RESULTS The X-chromosome was of paternal origin (X(pat)) in 52 (29%) of 180 and of maternal origin (X(mat)) in 128 (71%) of 180 patients. Height gain from the start of GH treatment to adult height was similar in X(mat) and X(pat) patients (+2.1 ± 0.9 vs. +2.2 ± 0.8 TS sd score, P = 0.45). The lack of influence of parental origin of the X-chromosome was confirmed in multivariate analysis. Parental origin of the X-chromosome also had no effect on the other growth characteristics studied, including growth velocity during the first year on GH treatment. Patient height was correlated with the heights of both parents and was not influenced by the parental origin of the X-chromosome. CONCLUSION In this, the largest such study carried out to date, the parental origin of the X-chromosome did not alter the effect of GH treatment or affect any other features of growth in TS.
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Affiliation(s)
- Marie Devernay
- Univ Paris Diderot, Sorbonne Paris Cité, F-75019, Paris, France
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15
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Spaggiari E, Aboura A, Sinico M, Mabboux P, Dupont C, Delezoide AL, Guimiot F. Prenatal diagnosis of a 7p15-p21 deletion encompassing the TWIST1 gene involved in Saethre-Chotzen syndrome. Eur J Med Genet 2012; 55:498-501. [PMID: 22569119 DOI: 10.1016/j.ejmg.2012.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 04/20/2012] [Indexed: 11/28/2022]
Abstract
Saethre-Chotzen syndrome is a craniosynostosis syndrome that is rarely diagnosed prenatally. It is caused by cytogenetic deletions or mutations of the TWIST1 gene. We report here a de novo prenatal case with clinically and molecularly well defined Saethre-Chotzen syndrome due to a TWIST1 deletion. This is the first reported case of a deletion encompassing the TWIST1 gene to be diagnosed prenatally. We recommend screening for a deletion of the TWIST1 gene if signs of coronal craniosynostosis with no clear etiology are observed on ultrasound examination.
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Affiliation(s)
- Emmanuel Spaggiari
- Department of Developmental Biology, AP-HP, Robert Debré Hospital, 48, Boulevard Sérurier, 75019 Paris, France
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16
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Haddad V, Aboura A, Tosca L, Guediche N, Mas AE, L'Herminé AC, Druart L, Picone O, Brisset S, Tachdjian G. Tetrasomy 13q31.1qter due to an inverted duplicated neocentric marker chromosome in a fetus with multiple malformations. Am J Med Genet A 2012; 158A:894-900. [DOI: 10.1002/ajmg.a.35258] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2011] [Accepted: 12/23/2011] [Indexed: 12/29/2022]
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17
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Delahaye A, Bitoun P, Drunat S, Gérard-Blanluet M, Chassaing N, Toutain A, Verloes A, Gatelais F, Legendre M, Faivre L, Passemard S, Aboura A, Kaltenbach S, Quentin S, Dupont C, Tabet AC, Amselem S, Elion J, Gressens P, Pipiras E, Benzacken B. Genomic imbalances detected by array-CGH in patients with syndromal ocular developmental anomalies. Eur J Hum Genet 2012; 20:527-33. [PMID: 22234157 DOI: 10.1038/ejhg.2011.233] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
In 65 patients, who had unexplained ocular developmental anomalies (ODAs) with at least one other birth defect and/or intellectual disability, we performed oligonucleotide comparative genome hybridisation-based microarray analysis (array-CGH; 105A or 180K, Agilent Technologies). In four patients, array-CGH identified clinically relevant deletions encompassing a gene known to be involved in ocular development (FOXC1 or OTX2). In four other patients, we found three pathogenic deletions not classically associated with abnormal ocular morphogenesis, namely, del(17)(p13.3p13.3), del(10)(p14p15.3), and del(16)(p11.2p11.2). We also detected copy number variations of uncertain pathogenicity in two other patients. Rearranged segments ranged in size from 0.04 to 5.68 Mb. These results show that array-CGH provides a high diagnostic yield (15%) in patients with syndromal ODAs and can identify previously unknown chromosomal regions associated with these conditions. In addition to their importance for diagnosis and genetic counselling, these data may help identify genes involved in ocular development.
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Affiliation(s)
- Andrée Delahaye
- AP-HP, Hôpital Jean Verdier, Service d'Histologie, Embryologie, et Cytogénétique, Bondy, France.
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18
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Biran V, Bornes M, Aboura A, Masmoudi S, Drunat S, Baumann C, Osimani S, Dalle JH, Sterkers G, Verloes A, Farnoux C, Maury L, Schmitz T, Khung S, Baud O. A long-term competent chimeric immune system in a dizygotic dichorionic twin. Pediatrics 2011; 128:e458-63. [PMID: 21746725 DOI: 10.1542/peds.2010-3557] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
We present here a rare case that involved the long-term coexistence of 2 mature, functional, and equilibrated immune systems in a single child after fetofetal transfusion between dizygotic twins. A dichorionic diamniotic pregnancy complicated by twin anemia-polycythemia sequence resulted in the demise of 1 twin. The detection of abnormal vessels on the dichorionic plate strongly suggested the existence of functional vascular anastomoses leading to blood chimerism in the survivor. Genetic, phenotypic, and immunologic analyses at 2 years revealed chimeric lymphoid and myeloid cells in the surviving twin, although no tissue mosaicism was detected, which indicates that early transfusion led to mutual immune tolerance.
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19
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Dupont C, Guimiot F, Perrin L, Marey I, Smiljkovski D, Le Tessier D, Lebugle C, Baumann C, Bourdoncle P, Tabet AC, Aboura A, Benzacken B, Dupont JM. 3D position of pericentromeric heterochromatin within the nucleus of a patient with ICF syndrome. Clin Genet 2011; 82:187-92. [PMID: 21554265 DOI: 10.1111/j.1399-0004.2011.01697.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
ICF (immunodeficiency, centromeric region instability, facial anomalies) syndrome is a rare autosomal recessive disorder characterised by severe immunodeficiency, craniofacial anomalies and chromosome instability. Chromosome analyses from blood samples show a high frequency of decondensation of pericentromeric heterochromatin (PH) and rearrangements involving chromosomes 1 and 16. It is the first and, as far as we know, the only disease associated with a mutation in a DNA methyltransferase gene, DNMT3B, with significant hypomethylation of the classical satellite DNA, the major component of the juxtacentromeric heterochromatin. To better understand the complex links between the hypomethylation of the satellite DNA, the cytogenetic anomalies and the clinical features of ICF syndrome, we performed three-dimensional (3D) FISH on preserved cells from a patient with a suspected ICF phenotype. Analysis of DNMT3B did not reveal any mutation in our patient, making this case an ICF type 2. The results of 3D-FISH showed a statistically significant change in the intranuclear position of PH of chromosome 1 in cells of the patient as compared to normal cells. It is difficult to understand how a defect in the methylation pathway can be responsible for the various symptoms of this condition. From our observations we suggest a mechanistic link between the reorganisation of the nuclear architecture and the altered gene expression.
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Affiliation(s)
- C Dupont
- Institut Cochin, Inserm U567-UMR CNRS 8104 équipe 21, Université Paris Descartes, Faculté de médecine, Paris, France.
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20
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Vialard F, Simoni G, Aboura A, De Toffol S, Molina Gomes D, Marcato L, Serero S, Clement P, Bouhanna P, Rouleau E, Grimi B, Selva J, Gaetani E, Maggi F, Joseph A, Benzacken B, Grati FR. Prenatal BACs-on-Beads™
: a new technology for rapid detection of aneuploidies and microdeletions in prenatal diagnosis. Prenat Diagn 2011; 31:500-8. [DOI: 10.1002/pd.2727] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Revised: 01/28/2011] [Accepted: 01/28/2011] [Indexed: 11/08/2022]
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21
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Tabet AC, Aboura A, Gérard M, Pilorge M, Dupont C, Gadisseux JF, Hervy N, Pipiras E, Delahaye A, Kanafani S, Verloes A, Benzacken B, Betancur C. Molecular characterization of a de novo 6q24.2q25.3 duplication interrupting UTRN in a patient with arthrogryposis. Am J Med Genet A 2010; 152A:1781-8. [PMID: 20583184 DOI: 10.1002/ajmg.a.33433] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Chromosome 6q duplications have been documented repeatedly, allowing the delineation of a "6q duplication syndrome," characterized by hypertelorism, downslanting palpebral fissures, tented upper lip, short neck, severe mental and growth retardation, and joint contractures. Most reported cases result from malsegregation of a reciprocal translocation leading to a terminal 6q duplication and partial monosomy of another chromosome. Only 11 cases of de novo pure duplication have been reported so far. The breakpoints do not appear to be recurrent, but in most cases they have not been characterized molecularly, precluding genotype-phenotype correlation. We report on an 8-year-old girl with a phenotype consistent with mild 6q duplication syndrome, including characteristic physical findings, mild mental retardation, and joint contractures. She carries a 13 Mb de novo 6q24.2q25.3 duplication, diagnosed by high-resolution karyotype and confirmed by array-CGH. Molecular characterization of the duplicated segment with quantitative PCR showed that the proximal breakpoint is localized within the UTRN gene, encoding utrophin, the autosomal homologue of dystrophin. We discuss the possible implication of UTRN in arthrogryposis associated with duplications spanning the 6q23q26 region.
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Affiliation(s)
- Anne-Claude Tabet
- AP-HP, Cytogenetics Unit, Department of Genetics, Robert Debré Hospital, Paris, France.
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22
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Rifai L, Port-Lis M, Tabet AC, Bailleul-Forestier I, Benzacken B, Drunat S, Kuzbari S, Passemard S, Verloes A, Aboura A. Ectodermal dysplasia-like syndrome with mental retardation due to contiguous gene deletion: further clinical and molecular delineation of del(2q32) syndrome. Am J Med Genet A 2010; 152A:111-7. [PMID: 20034071 DOI: 10.1002/ajmg.a.33164] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We report on a patient with an interstitial deletion of the long arm of chromosome 2 at 2q31.2q33.2. She had prenatal and postnatal growth retardation, microcephaly, facial dysmorphism, cleft palate, camptodactyly, bilateral talipes equinovarus, severe intellectual disability, and ectodermal anomalies. She showed thin, atrophic skin, sparse, brittle, slowly growing hair, oligodontia with abnormally shaped teeth, normal sweating, and normal fingernails, consistent with a diagnosis of ectodermal dysplasia. Array CGH analysis (Agilent 44K) showed the deletion to span 26 Mb, between cytogenetic bands 2q31.2 and 2q33. The deletion leads to hemizygosity for the HOXD cluster and its regulatory elements, COL3A1/COL5A2, GTF3C3, CASP8, CASP10, and SABT2 could perhaps interfere with long range control of DLX1 and DLX2 expression. This girl confirms the existence of a clinically recognizable 2q32 microdeletion syndrome, as recently delineated by Van Buggenhout et al. and confirms a novel putative locus for ectodermal dysplasia on chromosome 2q31q33. We recommend considering cytogenetic and/or molecular screening for del(2q32) in patients with developmental disability and ectodermal dysplasia-like phenotype, including thin skin, oligodontia, dysplastic teeth, and sparse hair.
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Affiliation(s)
- Laila Rifai
- Department of Medical Genetics, AP-HP-Robert DEBRE University Hospital, Paris, France
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Guilherme R, Guimiot F, Tabet AC, Khung-Savatovsky S, Gauthier E, Nouchy M, Benzacken B, Verloes A, Oury JF, Delezoide AL, Aboura A. Abnormal muscle development of the diaphragm in a fetus with 2p14-p16 duplication. Am J Med Genet A 2010; 149A:2892-7. [PMID: 19938079 DOI: 10.1002/ajmg.a.33135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Romain Guilherme
- Department of Developmental Biology, AP-HP Robert Debré University Hospital, Paris Diderot University, Paris, France.
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Anselem O, Bazin A, Mechler C, Blin G, Garel C, Aboura A, Moutard ML, Mandelbrot L. Prenatal Diagnosis of 18q-Syndrome: A Case of Fetal Mosaicism with a Normal Karyotype in Chorionic Villi. Fetal Diagn Ther 2010; 28:180-5. [DOI: 10.1159/000317012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Accepted: 06/13/2010] [Indexed: 11/19/2022]
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25
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Aboura A, Dupas C, Tachdjian G, Portnoï MF, Bourcigaux N, Dewailly D, Frydman R, Fauser B, Ronci-Chaix N, Donadille B, Bouchard P, Christin-Maitre S. Array comparative genomic hybridization profiling analysis reveals deoxyribonucleic acid copy number variations associated with premature ovarian failure. J Clin Endocrinol Metab 2009; 94:4540-6. [PMID: 19837940 DOI: 10.1210/jc.2009-0186] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
INTRODUCTION Premature ovarian failure (POF) is defined by amenorrhea of at least 4- to 6-month duration, occurring before 40 yr of age, with two FSH levels in the postmenopausal range. Its etiology remains unknown in more than 80% of cases. Standard karyotypes, having a resolution of 5-10 Mb, have identified critical chromosomal regions, mainly located on the long arm of the X chromosome. Array comparative genomic hybridization (a-CGH) analysis is able to detect submicroscopic chromosomal rearrangements with a higher genomic resolution. We searched for copy number variations (CNVs), using a-CGH analysis with a resolution of approximately 0.7 Mb, in a cohort of patients with POF. PATIENTS AND METHODS We prospectively included 99 women. Our study included a conventional karyotype and DNA microarrays comprising 4500 bacterial artificial chromosome clones spread on the entire genome. RESULTS Thirty-one CNVs have been observed, three on the X chromosome and 28 on autosomal chromosomes. Data have been compared to control populations obtained from the Database of Genomic Variants (http://projects.tcag.ca/variation). Eight statistically significantly different CNVs have been identified in chromosomal regions 1p21.1, 5p14.3, 5q13.2, 6p25.3, 14q32.33, 16p11.2, 17q12, and Xq28. CONCLUSION We report the first study of CNV analysis in a large cohort of Caucasian POF patients. In the eight statistically significant CNVs we report, we found five genes involved in reproduction, thus representing potential candidate genes in POF. The current study along with emerging information regarding CNVs, as well as data on their potential association with human diseases, emphasizes the importance of assessing CNVs in cohorts of POF women.
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Affiliation(s)
- Azzedine Aboura
- Department of Endocrinology, Saint-Antoine Hospital, Centre de Référence des Maladies, Endocriniennes Rares de la Croissance, Assistance Publique-Hôpitaux de Paris, ER9 University Pierre et Marie Curie, 75005 Paris, France
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Jaillard S, Drunat S, Bendavid C, Aboura A, Etcheverry A, Journel H, Delahaye A, Pasquier L, Bonneau D, Toutain A, Burglen L, Guichet A, Pipiras E, Gilbert-Dussardier B, Benzacken B, Martin-Coignard D, Henry C, David A, Lucas J, Mosser J, David V, Odent S, Verloes A, Dubourg C. Identification of gene copy number variations in patients with mental retardation using array-CGH: Novel syndromes in a large French series. Eur J Med Genet 2009; 53:66-75. [PMID: 19878743 DOI: 10.1016/j.ejmg.2009.10.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Accepted: 10/17/2009] [Indexed: 12/16/2022]
Abstract
Array-CGH has revealed a large number of copy number variations (CNVs) in patients with multiple congenital anomalies and/or mental retardation (MCA/MR). According to criteria recently listed, pathogenicity was clearly suspected for some CNVs but benign CNVs, considered as polymorphisms, have complicated the interpretation of the results. In this study, genomic DNAs from 132 French patients with unexplained mental retardation were analysed by genome wide high-resolution Agilent 44K oligonucleotide arrays. The results were in accordance with those observed in previous studies: the detection rate of pathogenic CNVs was 14.4%. A non-random involvement of several chromosomal regions was observed. Some of the microimbalances recurrently involved regions (1q21.1, 2q23.1, 2q32q33, 7p13, 17p13.3, 17p11.2, 17q21.31) corresponding to known or novel syndromes. For all the pathogenic CNVs, further cases are needed to allow more accurate genotype-phenotype correlations underscoring the importance of databases to group patients with similar molecular data.
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Affiliation(s)
- Sylvie Jaillard
- Laboratoire de Cytogénétique et Biologie Cellulaire, CHU Pontchaillou, Rennes, France.
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27
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Guimiot F, Marcorelles P, Aboura A, Bonyhay G, Patrier S, Menez F, Drouin-Garraud V, Icowick V, Eurin D, Garel C, Moirot H, Verspyck E, Saugier-Veber P, Attie-Bitach T, Picone O, Oury JF, Verloes A, Delezoide AL, Laquerrière A. Giant diencephalic harmartoma and related anomalies: a newly recognized entity distinct from the Pallister-Hall syndrome. Am J Med Genet A 2009; 149A:1108-15. [PMID: 19449422 DOI: 10.1002/ajmg.a.32859] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An hypothalamic hamartoma is an abnormal mass of mature glio-neuronal tissue present in the hypothalamic area. It usually measures <2 cm of diameter. Most of the time, this hamartoma occurs in Pallister-Hall syndrome (PHS), due to heterozygous GLI3 mutations. We report on five fetuses with giant diencephalic hamartoma and other midline brain and facial malformations, without mutation in the GLI3 gene or genomic rearrangements in three of them. The fetuses showed facial asymmetry, unilateral ear and eye anomalies, and facial cleft. Extracephalic malformations consisted of vertebral anomalies and short nails, without polydactyly and cardiac malformation. The diencephalon was replaced by an encephaloid mass protruding into the facial cleft. Normal cerebral structures were not detectable. In one patient, holoprosencephaly of the syntelencephalic type was noted. Arhinencephaly was present in all patients. Histologically, the ill-defined, multilobulated lesion was made of neuroblastic and neurocytic cell foci, lying in a fibrillar network, elaborating sometimes perivascular pseudorosettes, with a maturation gradient in accordance with the fetal age. Owing to their location, the tumors could be described as diencephalic, rather than hypothalamic hamartomas. The striking asymmetry of the facial anomalies and the diencephalic malformations are not in the spectrum observed with PHS and related syndromes, suggesting a distinct entity involving abnormal morphogenetic developmental fields at around 5 weeks of gestation.
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Affiliation(s)
- Fabien Guimiot
- Department of Developmental Biology, AP-HP- Robert Debré Hospital, Denis Diderot University, Paris, France
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Delahaye A, Toutain A, Aboura A, Dupont C, Tabet AC, Benzacken B, Elion J, Verloes A, Pipiras E, Drunat S. Chromosome 22q13.3 deletion syndrome with a de novo interstitial 22q13.3 cryptic deletion disrupting SHANK3. Eur J Med Genet 2009; 52:328-32. [PMID: 19454329 DOI: 10.1016/j.ejmg.2009.05.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Accepted: 05/09/2009] [Indexed: 11/25/2022]
Abstract
BACKGROUND The 22q13.3 deletion syndrome (or Phelan-McDermid syndrome, MIM 606232) is characterized by developmental delay, absent or severely delayed speech, neonatal hypotonia, autistic behavior, normal to accelerated growth, and minor dysmorphic facial features. Among the three genes in the minimal critical region (from the centromere to the telomere: SHANK3, ACR and RABL2B), the defect in the SHANK3 gene is considered to be the cause of the neurobehavioral symptoms. OBJECTIVE We describe the molecular characterization of a de novo interstitial del(22)(q13.3q13.3) disrupting the SHANK3 gene in a child with a phenotype compatible with the 22q13.3 deletion syndrome. METHODS Clinical work-up included clinical histories, physical, neurological, and ophthalmological examinations, and imaging of the brain. Commercially available MLPA for subtelomeric analysis, FISH specific probes and quantitative real-time PCR were used to characterize the rearrangement. RESULTS Subtelomere analysis by MLPA showed a discrepancy between P036B and P070 kits (MCR Holland): the P070 MLPA 22q probe (targeting the ARSA gene) showed a deletion but the P036B one (targeting the RABL2B gene) showed a normal result. FISH analysis using LSI TUPLE1/LSI ARSA (Vysis) probes confirmed deletion of ARSA, whereas FISH with N25/N85A3 (Cytocell) probes, targeting the SHANK3 locus was normal. Supplemented FISH analysis using BAC clones allowed us to specify the centromeric breakpoint region of the interstitial deletion between clones RP11-354I12 and RP11-232E17, at less than 2 Mb from the telomere. Quantitative real-time PCR of exon 5, 22 and 24 and intron 9 of SHANK3 showed that the telomeric breakpoint occurred between intron 9 and exon 22. CONCLUSIONS These data highlight the difficulty of performing an appropriate test aimed at looking for cryptic 22q13.3 deletion. Furthermore, the molecular characterization of this interstitial 22q13.3 deletion contributes to the clinical and genetic delineation of the 22q13.3 deletion syndrome.
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Affiliation(s)
- A Delahaye
- Histology-Embryology-Cytogenetics Department, APHP-Jean Verdier University Hospital, UFR SMBH, Paris 13 University, Bondy, France.
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29
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Dupont C, Delahaye A, Burglen L, Tabet AC, Aboura A, Kanafani S, Baverel F, de Villemeur TB, Benzacken B, Pipiras E. First cryptic balanced reciprocal translocation mosaicism and familial transmission. Am J Med Genet A 2008; 146A:2971-4. [DOI: 10.1002/ajmg.a.32547] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Jaillard S, Dubourg C, Gérard-Blanluet M, Delahaye A, Pasquier L, Dupont C, Henry C, Tabet AC, Lucas J, Aboura A, David V, Benzacken B, Odent S, Pipiras E. 2q23.1 microdeletion identified by array comparative genomic hybridisation: an emerging phenotype with Angelman-like features? J Med Genet 2008; 46:847-55. [PMID: 18812405 DOI: 10.1136/jmg.2008.058156] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
BACKGROUND Genome-wide screening of patients with mental retardation using array comparative genomic hybridisation (CGH) has identified several novel imbalances. With this genotype-first approach, the 2q22.3q23.3 deletion was recently described as a novel microdeletion syndrome. The authors report two unrelated patients with a de novo interstitial deletion mapping in this genomic region and presenting similar "pseudo-Angelman" phenotypes, including severe psychomotor retardation, speech impairment, epilepsy, microcephaly, ataxia, and behavioural disabilities. METHODS The microdeletions were identified by array CGH using oligonucleotide and bacterial artificial chromosome (BAC) arrays, and further confirmed by fluorescence in situ hybridisation (FISH) and semi-quantitative polymerase chain reaction (PCR). RESULTS The boundaries and sizes of the deletions in the two patients were different but an overlapping region of about 250 kb was defined, which mapped to 2q23.1 and included two genes: MBD5 and EPC2. The SIP1 gene associated with the Mowat-Wilson syndrome was not included in the deleted genomic region. DISCUSSION Haploinsufficiency of one of the deleted genes (MBD5 or EPC2) could be responsible for the common clinical features observed in the 2q23.1 microdeletion syndrome, and this hypothesis needs further investigation.
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Bélien V, Gérard-Blanluet M, Serero S, Le Dû N, Baumann C, Jacquemont ML, Dupont C, Krabchi K, Drunat S, Elbez A, Janaud JC, Benzacken B, Verloes A, Tabet AC, Aboura A. Partial trisomy of chromosome 22 resulting from a supernumerary marker chromosome 22 in a child with features of cat eye syndrome. Am J Med Genet A 2008; 146A:1871-4. [DOI: 10.1002/ajmg.a.32392] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Tachdjian G, Aboura A, Portnoi MF, Pasquier M, Bourcigaux N, Simon T, Rousseau G, Finkel L, Benkhalifa M, Christin-Maitre S. Cryptic Xp duplication including the SHOX gene in a woman with 46,X, del(X)(q21.31) and premature ovarian failure. Hum Reprod 2007; 23:222-6. [DOI: 10.1093/humrep/dem358] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Benzacken B, Tabet AC, Aboura A, Dupont C, Delahaye A, Kanafani S, Lohman L, Uzan M, Oury JF, Pipiras E. Apport de la CGH-array au diagnostic prénatal d’anomalies génomiques chez des fœtus présentant des signes malformatifs, avec un caryotype apparemment équilibré. Ing Rech Biomed 2007. [DOI: 10.1016/j.rbmret.2007.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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Maurin ML, Brisset S, Le Lorc'h M, Poncet V, Trioche P, Aboura A, Labrune P, Tachdjian G. Terminal 14q32.33 deletion: genotype-phenotype correlation. Am J Med Genet A 2007; 140:2324-9. [PMID: 17022077 DOI: 10.1002/ajmg.a.31438] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We report on a female infant presenting with psychomotor retardation and facial dysmorphism. Cytogenetic studies showed an abnormal chromosome 14 with ectopic NOR sequences at the extremity of the long arm with a terminal 14q32.33 deletion. Review of the eight cases with pure terminal 14q32.3 deletions described to date documented that our observation is the smallest terminal 14q deletion ever reported. Thus, genotype-phenotype correlation allows us to delimit the critical region for mental retardation, hypotonia, epi-telecanthus, short bulbous nose, long philtrum, thin upper lip, and small mouth observed in 14 qter deletions to the subtelomeric 1.6 Mb of chromosome 14.
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Affiliation(s)
- M-L Maurin
- Service d'Histologie Embryologie Cytogénétique APHP, INSERM U782, Hôpital Antoine Béclère, Clamart, France.
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35
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Mabboux P, Brisset S, Aboura A, Pineau D, Koubi V, Joannidis S, Labrune P, Tachdjian G. Pure and complete trisomy 18p due to a supernumerary marker chromosome associated with moderate mental retardation. Am J Med Genet A 2007; 143A:727-33. [PMID: 17330860 DOI: 10.1002/ajmg.a.31633] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Trisomy for the short arm of chromosome 18 or trisomy 18p, is rarely described. We report on a 13-year-old boy with minor facial anomalies, mental retardation, bilateral cryptorchidism associated with a de novo supernumerary marker chromosome (SMC). Using fluorescence in situ hybridization and comparative genomic hybridization analyses, this SMC corresponded to the p arm of chromosome 18 associated with a centromere of either chromosome 13 or 21 and nucleolus organizing regions (NORs). We report here the first case of a pure and complete trisomy 18p due to a SMC. This report and review of literature confirm that the main phenotypic anomaly associated with trisomy 18p is moderate mental retardation.
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Affiliation(s)
- P Mabboux
- Service d'Histologie Embryologie Cytogénétique, INSERM U782, Hôpital Antoine Béclère, APHP, Université Paris Sud, Clamart, France.
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36
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Kanafani S, Aboura A, Pipiras E, Carbillon L, Tabet AC, Largillière C, Garel C, Gressens P, Bucourt M, Cedrin-Durnerin I, Lachassinne E, Roumegoux C, Uzan M, Hugues JN, Wolf JP, Benzacken B. Semilobar holoprosencephaly prenatal diagnosis: an unexpected complex rearrangement in ade novo apparently balanced reciprocal translocation on karyotype. Prenat Diagn 2007; 27:279-84. [PMID: 17269127 DOI: 10.1002/pd.1639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We report a semilobar holoprosencephaly (HPE) in a post-intracytoplasmic-sperm-injection pregnancy. It was suggested by ultrasonography (US), documented on karyotype, identified with magnetic resonance imaging (MRI), established after birth and confirmed on post-mortem autopsy. An amniocentesis revealed a de novo apparently balanced reciprocal translocation 46,XY, t(7;8) (q31.3;q12). Fluorescence in situ hybridization (FISH) identified a deletion in the region of the Sonic Hedgehog gene (SHH) on der(8); nevertheless, the subtelomeric regions for chromosomes 7 and 8 were present. The parents decided to continue the pregnancy; a boy was born and survived for 3 days. The brain autopsy confirmed the semilobar HPE previously noted on US and MRI. Further, band-specific FISH revealed, in addition to SHH deletion, the presence of an inversion in the 7q translocated material on der(8). The parents' karyotypes were normal. An unexpected complex rearrangement was present in a de novo apparently balanced reciprocal translocation in a semilobar HPE.
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Affiliation(s)
- S Kanafani
- Service d'Histologie-Embryologie et Cytogénétique, Biologie de la Reproduction, Hôpital Jean Verdier, AP-HP, Bondy, France
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Tachdjian G, Aboura A, Brisset S, Dommergues M, Gajdos V, Labrune P. Early and rapid prenatal diagnosis of monosomy 2q36.1 in trophoblast cells. Fetal Diagn Ther 2006; 21:428-32. [PMID: 16912492 DOI: 10.1159/000093885] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2005] [Accepted: 10/12/2005] [Indexed: 11/19/2022]
Abstract
OBJECTIVES CVS is the earliest procedure for cytogenetic analysis but the quality of metaphases obtained does not allow the characterization of subtle chromosomal anomalies. We report the application interphase fluorescence in situ hybridization for the rapid prenatal diagnosis of a subtle structural chromosome anomaly in trophoblast cells. METHODS AND RESULTS The foetus was karyotyped because of a paternal complex chromosomal anomaly 46,XY,inv(2)(q14.3q35),ins(10;2)(q25;q36.1q36.1). Fluorescence in situ hybridization analyses were performed on interphase nuclei and metaphase chromosomes from uncultured chorionic villi using bacterial artificial chromosomes specific for the 2q chromosomal region. Direct conventional cytogenetics showed an apparently normal male karyotype, whereas fluorescence in situ hybridization analysis showed a deletion of the chromosomal region 2q36.1 and a paracentric inversion of the chromosome 2q leading to a partial monosomy 2q36.1. CONCLUSION This strategy allowed us to offer an early and rapid chromosomal analysis for this couple leading to a better management of the pregnancy. This report demonstrates that interphase fluorescence in situ hybridization can be used in direct CVS for a rapid and early prenatal diagnosis of complex chromosomal rearrangements.
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Affiliation(s)
- Gérard Tachdjian
- Service d'Histologie Embryologie Cytogénétique, Hôpital Antoine Béclère (APHP), Clamart, France.
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Portnoï MF, Aboura A, Tachdjian G, Bouchard P, Dewailly D, Bourcigaux N, Frydman R, Reyss AC, Brisset S, Christin-Maitre S. Molecular cytogenetic studies of Xq critical regions in premature ovarian failure patients. Hum Reprod 2006; 21:2329-34. [PMID: 16751643 DOI: 10.1093/humrep/del174] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Premature ovarian failure (POF) is defined as amenorrhoea for more than 6 months, occurring before the age of 40, with an FSH serum level higher than 40 mIU/ml. Cytogenetically visible rearrangements of the X chromosome are associated with POF. Our hypothesis was that cryptic Xq chromosomal rearrangements could be an important etiological contributor of POF. METHODS Ninety POF women were recruited and compared to 20 control women. Peripheral blood samples were collected and metaphase chromosomes were prepared using standard cytogenetic methods. To detect Xq chromosomal micro-rearrangements, fluorescence in situ hybridization (FISH) analysis was performed using a selection of 30 bacterial artificial chromosome (BAC) and P1 artificial chromosome clones, spanning Xq13-q27. We further localized the translocation breakpoints by FISH with additional BAC clones. RESULTS Chromosomal abnormalities were identified in 8.8% of our 90 patients [one triple X, three large Xq deletions 46,X,del(X)(q22.3), 46,X,del(X)(q21.2) and 46,X,del(X)(q21.32), two balanced X;autosome translocations 46,X,t(X;1) (q21.1;q32) and 46,X,t(X;9)(q21.31;q21.2) and two Robertsonian translocations 45,XX,der(15;22)(q10;q10) and 45,XX,der(14;21)(q10;q10)]. The two Xq translocation breakpoints were among a cluster of repetitive elements without any known genes. FISH analysis did not reveal any Xq chromosomal micro-rearrangement. CONCLUSIONS Karyotyping is definitely helpful in the evaluation of POF patients. No submicroscopic chromosomal rearrangements affecting Xq region were identified. Further analysis using DNA microarrays should help delineate Xq regions involved in POF.
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Affiliation(s)
- M F Portnoï
- Laboratoire de cytogénétique, Hôpital Saint-Antoine, Paris, France
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Titomanlio L, Giurgea I, Baumann C, Elmaleh M, Sachs P, Chalard F, Aboura A, Verloes A. A locus for sacral/anorectal malformations maps to 6q25.3 in a 0.3 Mb interval region. Eur J Hum Genet 2006; 14:971-4. [PMID: 16724010 DOI: 10.1038/sj.ejhg.5201635] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Partial absence of the sacrum is a rare congenital defect that also occurs as an autosomal-dominant trait, whereas imperforate/ectopic anus is a relatively common malformation, usually observed in multiple congenital anomalies syndromes. We report on a girl born to healthy consanguineous parents (first cousins once removed) with anal imperforation and associated rectovaginal fistula and partial sacral agenesis. Facial dysmorphism included a high forehead, epicanthic folds, downslanting palpebral fissures, hypertelorism and a depressed nasal root. Brain MRI showed a bilateral opercular dysplasia with a unilateral (right) pachygyria; MRI and X-ray imaging of the spine disclosed a tethered cord associated with partial sacral agenesis. She showed a moderate developmental delay. Ophthalmologic examination evidenced bilateral microphthalmos and relative microcornea. Cytogenetic studies in our patient disclosed a pure de novo 6q25.3 --> qter deletion. By genotype analysis, we detected in our patient a maternal allele loss encompassing D6S363 and D6S446. Pure distal 6q deletion is a rare anomaly, reported in association with sacral/anorectal malformations (sacral agenesis, anal imperforation/ectopia) and never with cortical dysplasia. Pooling deletion mapping information in patients with pure terminal and interstitial 6q deletion allowed us to define a critical region spanning 0.3 Mb between the markers D6S959 and D6S437 for sacral/anal malformations. We hypothesize that haploinsufficiency for a gene within the deleted region may impair normal development of caudal structures, possibly acting on the notochordal development. European Journal of Human Genetics (2006) 14, 971-974. doi:10.1038/sj.ejhg.5201635; published online 17 May 2006.
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Affiliation(s)
- Luigi Titomanlio
- Department of Child Neurology, AP-HP Robert Debré Hospital, Paris, France
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Gonzales E, Caeymaex L, Aboura A, Vial M, De Laveaucoupet J, Labrune P, Tachdjian G. Cocaïne et trisomie 8 associées au diagnostic prénatal d’agénésie du corps calleux. ACTA ACUST UNITED AC 2005; 34:803-6. [PMID: 16319772 DOI: 10.1016/s0368-2315(05)82957-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the case of a newborn presenting an agenesis of corpus callosum (ACC) discovered in the prenatal period and initially related to cocaine exposure during the first trimester of gestation. The cytogenetic analysis revealed a trisomy 8 mosaicism. The putative role of prenatal cocaine exposure and mosaicism for chromosome 8 in ACC are discussed. This report emphasizes the specific analysis of chromosome 8 by using fluorescence in situ hybridization as a complement to routine cytogenetic analysis for prenatal diagnosis of ACC.
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Viguié F, Aboura A, Bouscary D, Ramond S, Delmer A, Tachdjian G, Marie JP, Casadevall N. Common 4q24 deletion in four cases of hematopoietic malignancy: early stem cell involvement? Leukemia 2005; 19:1411-5. [PMID: 15920487 DOI: 10.1038/sj.leu.2403818] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We determined bone marrow karyotype at diagnosis in four female acute myeloid leukemia (AML) or myelodysplasia patients, aged between 52 and 56 years. In each case, we observed chromosome rearrangement involving the same 4q24 band. Three patients had a balanced reciprocal translocation as the sole abnormality - t(3;4)(q26;q24), t(4;5)(q24;p16) and t(4;7)(q24;q21) - and the fourth had del(4)(q23q24), +4. We used a set of 4q BAC probes for fluorescent in situ hybridization (FISH) in these four cases. We found a 4q24 submicroscopic deletion in all three translocations, with a common deletion of approximately 0.5 Mb. In three cases, we concluded that rearrangement occurred in an early hematopoietic stem cell, as it was detected, in mosaic with a normal karyotype, in a fraction of remission bone marrow cells, peripheral T and B lymphocytes, malignant lymph node T-lymphoma cells in one case and B-lymphoblastoid cell lines established in two cases. Moreover, one of 10 additional AML patients tested by FISH had a normal karyotype and deletion of one of the commonly deleted probe sequences. A tumor suppressor gene may therefore be involved, especially as two patients developed malignant lymphoma at the same time as myeloid proliferation.
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Affiliation(s)
- F Viguié
- Laboratoire de Cytogénétique Onco-Hématologique, Hôpital Hôtel-Dieu, Paris, France.
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Brisset S, Izard V, Misrahi M, Aboura A, Madoux S, Ferlicot S, Schoevaert D, Soufir JC, Frydman R, Tachdjian G. Cytogenetic, molecular and testicular tissue studies in an infertile 45,X male carrying an unbalanced (Y;22) translocation: case report. Hum Reprod 2005; 20:2168-72. [PMID: 15845593 DOI: 10.1093/humrep/dei034] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
(Y;autosome) translocations have been reported in association with male infertility. Different mechanisms have been suggested to explain the male infertility, such as deletion of the azoospermic factor (AZF) on the long arm of the Y chromosome, or meiosis impairment. We describe a new case with a de novo unbalanced translocation t(Y;22) and discuss the genotype-phenotype correlation. A 36 year old male with azoospermia was found to have a mosaic 45,X/46,X, + mar karyotype. Fluorescence in situ hybridization (FISH) showed the presence of a derivative Y chromosome containing the short arm, the centromere and a small proximal part of the long-arm euchromatin of the Y chromosome and the long arm of chromosome 22. The unstable small marker chromosome included the short arm and the centromere of chromosome 22. This unbalanced translocation t(Y;22)(q11.2;q11.1) generated the loss of the long arm of the Y chromosome involving a large part of AZFb, AZFc and Yq heterochromatin regions. Testicular tissue analyses showed sperm in the wet preparation. Our case shows the importance of documenting (Y;autosome) translocations with molecular and testicular tissue analyses.
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Affiliation(s)
- S Brisset
- Service de Génétique et Reproduction and Service de Gynécologie-Obstétrique, Hôpital Antoine Béclère, 92140 Clamart, France.
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Tachdjian G, Aboura A, Benkhalifa M, Creveaux I, Foix-Hélias L, Gadisseux JF, Boespflug-Tanguy O, Mohammed M, Labrune P. De novo interstitial direct duplication of Xq21.1q25 associated with skewed X-inactivation pattern. Am J Med Genet A 2005; 131:273-80. [PMID: 15526291 DOI: 10.1002/ajmg.a.30359] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Genotype-phenotype correlation in women with an abnormal phenotype associated with a duplication of the long arm of the X chromosome remains unclear. We report on prenatal diagnosis and follow-up of a girl with an Xq duplication and dysmorphic features. The abnormal phenotype included growth retardation, hypotonia, and nystagmus. In order to improve the resolution of the cytogenetic analysis, we used both conventional and array-based comparative genomic hybridization to perform a global molecular cytogenetic analysis of the genome. These molecular cytogenetic analyses showed a direct duplication Xq21.1 --> q25 without other chromosomal abnormalities. This duplication was originating from the paternal X chromosome. Moreover, a skewed X-inactivation pattern was observed leading to a partial functional disomy of the chromosomal region Xq21.1q25. This report and review of the literature suggest that functional disomy for chromosome X could explain the abnormal phenotype. In prenatal diagnosis, this can have implication for patient management and genetic counseling.
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Affiliation(s)
- G Tachdjian
- Biologie et Génétique de la Reproduction, AP-HP Hôpital Antoine Béclère, 92140 Clamart, France.
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Petit FM, Frydman N, Benkhalifa M, Le Du A, Aboura A, Fanchin R, Frydman R, Tachdjian G. Could sperm aneuploidy rate determination be used as a predictive test before intracytoplasmic sperm injection? J Androl 2005; 26:235-41. [PMID: 15713829 DOI: 10.1002/j.1939-4640.2005.tb01090.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Chromosome abnormalities in embryos are a major cause of implantation and development failures. Some couples with normal karyotypes have repeated implantation failures after intracytoplasmic sperm injection (ICSI). In order to value patients at risk for genetic ICSI failures and the validity of sperm aneuploidy analysis, we have studied cytogenetic abnormalities in sperm from ICSI patients. Twenty-nine patients with normal karyotypes were included. Ten patients had at least 4 ICSI treatments without pregnancy (group A). Nine patients had a pregnancy after 1 to 3 ICSI treatments (group B). Ten fertile men with normal semen parameters were studied as controls (group C). Fluorescent in situ hybridization (FISH) was used for sperm nucleus cytogenetic analysis using chromosomes 8, 9, 13, 18, 21, X, and Y specific probes. Aneuploidy for each chromosome and diploidy rates were significantly higher in group A than in group B and in group B than in group C (P < .05). Considering each patient in groups A and B, aneuploidy rate for each chromosome was too variable to be considered as a significant test. We proposed analysis of the total sperm aneuploidy. Chromosomal sperm nuclei profile could be used as a predictive biological test before ICSI in order to improve genetic counseling for oligoasthenoteratozoospermia patients.
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Affiliation(s)
- François M Petit
- Department of Génétique et reproduction, Hôpital Antoine Béclère 157, rue de la Porte de Trivaux 92141 Clamart, France
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Petit FM, Gajdos V, Parisot F, Capel L, Aboura A, Lachaux A, Tachdjian G, Poüs C, Labrune P. Paternal isodisomy for chromosome 2 as the cause of Crigler–Najjar type I syndrome. Eur J Hum Genet 2004; 13:278-82. [PMID: 15586176 DOI: 10.1038/sj.ejhg.5201342] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Crigler-Najjar syndrome type I (CN-I) is a rare and severe autosomal recessive metabolic disease due to a total deficiency of bilirubin uridine diphosphate glucuronosyltransferase located on chromosome 2. We report on a child with CN-I due to a phenylalanine residue deletion inherited only from the father carrying this deletion at the heterozygous state. Cytogenetic analyses showed no deletion of the chromosomal 2q37 region. Microsatellite analysis of the child and his parents was consistent with paternal isodisomy for chromosome 2 in the child. This report demonstrates that uniparental disomy may be at the origin of very rare diseases transmitted as autosomal recessive traits and emphasizes the need for parental DNA analysis in such cases.
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Affiliation(s)
- François M Petit
- Service de Biochimie et Hormonologie, Hôpital Antoine Béclère, Clamart, France.
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L'herminé-Coulomb A, Houyel L, Aboura A, Audibert F, Dal Soglio D, Tachdjian G. Double-outlet right ventricle with absent left ventricle and mitral atresia in a fetus with a deletion 22q12. Prenat Diagn 2004; 24:708-12. [PMID: 15386448 DOI: 10.1002/pd.970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Interstitial deletions of chromosomal region 22q12 are rare. We report the prenatal diagnosis of a de novo interstitial deletion 22q12. The fetus was karyotyped because of a complex cardiac anomaly. Conventional and molecular cytogenetics showed a female karyotype with a de novo pericentric inversion of one chromosome 22 associated with a deletion of the chromosomal region 22q12 leading to a partial monosomy 22q12. At autopsy, the fetus showed double-outlet right ventricle (DORV) with absent left ventricle and mitral atresia. This observation suggests that one or several genes for the early looping step of heart development may reside in chromosomal region 22q12. Further studies are needed to identify these genes, and to search microdeletions of 22q12 region in patients with DORV.
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L'Herminé AC, Aboura A, Brisset S, Cuisset L, Castaigne V, Labrune P, Frydman R, Tachdjian G. Fetal phenotype of Prader-Willi syndrome due to maternal disomy for chromosome 15. Prenat Diagn 2003; 23:938-43. [PMID: 14634983 DOI: 10.1002/pd.732] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Prader-Willi syndrome (PWS) results from either paternal deletion of 15q11-q13, or maternal uniparental disomy (UPD) of chromosome 15 or imprinting center mutation. Prenatal diagnosis of PWS is currently indicated for chromosomal parental translocation involving chromosome 15 and for decreased fetal movements during the third trimester of gestation. Here we present the prenatal diagnosis of PWS during the first trimester of gestation and autopsy findings. Chorionic villus sampling (CVS) was performed for advanced maternal age at 13 weeks' gestation. CVS showed mosaicism including cells with a normal karyotype and cells with trisomy 15. Amniocentesis showed cells with a normal karyotype. Molecular analysis demonstrated that the fetus had a typical PWS abnormal methylation profile and maternal disomy for chromosome 15. Fetal ultrasound examination showed slightly enlarged lateral ventricles and hypoplasic male external genitalia without intra-uterine growth retardation. The autopsy showed a eutrophic male fetus with facial dysmorphy, hypoplasic genitalia, abnormal position of both feet and posterior hypoplasia of the corpus callosum. This report points out that in a karyotypically normal fetus with ambiguous male external genitalia and cerebral anomalies, extensive cytogenetic and molecular biology studies are strongly recommended because of risk of PWS.
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Brisset S, Aboura A, Audibert F, Costa JM, L'Herminé AC, Gautier V, Frydman R, Tachdjian G. Discordant prenatal diagnosis of trisomy 21 due to mosaic structural rearrangements of chromosome 21. Prenat Diagn 2003; 23:461-9. [PMID: 12813759 DOI: 10.1002/pd.620] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES Trisomy 21 mosaicism associated with a structural rearrangement of chromosome 21 is uncommon. We report on two prenatal diagnoses in which karyotypes showed mosaicism with an aberrant cell line, including a structural rearrangement of chromosome 21. METHODS Both these cases were associated with increased nuchal translucency. Conventional and molecular cytogenetic analyses were performed on uncultured and cultured trophoblast and amniotic fluid cells. RESULTS In Case 1, analysis of trophoblast cells revealed an abnormal karyotype of 47,XX,+mar.ish der(13/21)(D13Z1/D21Z1+)/46,XX. The amniocentesis showed a free non-mosaic trisomy 21. In Case 2, the trophoblast direct analysis showed a normal male karyotype whereas the long-term culture revealed a mosaicism for a dicentric long-arm isochromosome 21: 46,XY,idic(21)(p11)/45,XY,-21/46,XY. Amniocentesis showed an unbalanced non-mosaic karyotype 46,XY,idic(21)(p11) resulting therefore in trisomy for the long arm of chromosome 21. CONCLUSION Our cases underline the importance of combining the direct analysis and long-term culture of trophoblast and emphasise the need for confirmatory studies in other tissues when mosaicism of structural rearrangement is encountered in chorionic villi. The meiotic and mitotic mechanisms of formation of these structural rearrangements of chromosome 21 are discussed.
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Affiliation(s)
- Sophie Brisset
- Service de Génétique et Reproduction, AP-HP, Hôpital Antoine Béclère, Clamart, France.
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Aboura A, Labrune P, Perreaux F, Poncet V, Brisset S, Foix-L'Helias L, Tachdjian G. Deletion in the ABL gene resulting from a meiotic recombination of a maternal (3;22;9)(q22;q12;q34.1) translocation. J Med Genet 2003; 40:e6. [PMID: 12525554 PMCID: PMC1735263 DOI: 10.1136/jmg.40.1.e6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
MESH Headings
- Chromosomes, Human, Pair 22/genetics
- Chromosomes, Human, Pair 3/genetics
- Chromosomes, Human, Pair 9/genetics
- Cytogenetic Analysis/methods
- Female
- Gene Deletion
- Genes, abl/genetics
- Humans
- In Situ Hybridization, Fluorescence/methods
- Infant
- Male
- Meiosis/genetics
- Recombination, Genetic/genetics
- Translocation, Genetic/genetics
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Viguié F, Aboura A, Bouscary D, Guesnu M, Baumelou E, Dreyfus F, Casadevall N, Tachdjian G. Isodicentric/pseudoisodicentric chromosome 21 amplification in four cases of acute myelocytic leukemia or myelodysplasia. Cancer Genet Cytogenet 2002; 138:80-4. [PMID: 12419591 DOI: 10.1016/s0165-4608(02)00580-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The bone marrow karyotypes of three patients with acute myelocytic leukemia (AML) or myelodysplastic syndrome (MDS) were studied at diagnosis and revealed, multiple copies of the same chromosomal anomaly, considered as psu idic(21)(q22) associated with other rearrangement(s). The karyotype of a fourth patient with MDS in transformation showed one copy of a dicentric marker presumably derived from a similar psu idic(21) by (tandem?) interstitial amplification of part of its structure, resembling a "homogeneous staining region", and described as der(21)psu idic(21)(q22)hsr(21)(q22). This rearrangement, previously described in isolated cases only, might be considered as recurrent in AML/MDS and associated with an unfavorable prognosis. It is most probably a secondary change, because it was never observed as sole abnormality and the main association, as for trisomy 21, was with del(5q). In the four cases, the number of partial supernumerary segmental 21pter-->21q22 copies, ranged from 2 to 10. The AML1 gene did not appear to be the common target of this amplification because this locus had been lost by the psu idic(21) in one patient
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Affiliation(s)
- Franck Viguié
- Laboratoire de Cytogénétique Onco-Hématologique, Hôpital Hôtel-Dieu, Paris, France.
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