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Blanluet M, Chantot-Bastaraud S, Chambon P, Cassinari K, Vera G, Goldenberg A, Keren B, Le Meur N, Hannequin D, Mace B, Siffroi JP, Frebourg T, Nicolas G, Joly-Helas G. Recurrence of an early postzygotic rescue of an inherited unbalanced translocation resulting in mosaic segmental uniparental isodisomy of chromosome 11q in siblings. Am J Med Genet A 2021; 185:3057-3061. [PMID: 34043868 DOI: 10.1002/ajmg.a.62361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 04/10/2021] [Accepted: 04/30/2021] [Indexed: 11/08/2022]
Abstract
Balanced translocations are associated with a risk of transmission of unbalanced chromosomal rearrangements in the offspring. Such inherited chromosomal abnormalities are typically non-mosaic as they are present in the germline. We report the recurrence in two siblings of a mosaicism for a chromosomal rearrangement inherited from their asymptomatic father who carried a balanced t(2;11)(q35;q25) translocation. Both siblings exhibited a similar phenotype including intellectual disability, dysmorphic features, kyphoscoliosis, and cervical spinal stenosis. Karyotyping, fluorescence in situ hybridization and SNP array analysis of blood lymphocytes of both siblings identified two cell lines: one carrying a 2q35q37.3 duplication and a 11q25qter deletion (~90% cells), and one carrying an 11q uniparental isodisomy of maternal origin (~10% cells). We hypothesize that these mosaics were related to a postzygotic rescue mechanism which unexpectedly recurred in both siblings.
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Affiliation(s)
- Maud Blanluet
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Sandra Chantot-Bastaraud
- Department of Medical Genetics and Embryology, Armand-Trousseau Children Hospital, AP-HP, Paris, France
| | - Pascal Chambon
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Kévin Cassinari
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Gabriella Vera
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Alice Goldenberg
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Boris Keren
- Genetics Department, La Pitié-Salpêtrière Hospital, AP-HP, Paris, France
| | - Nathalie Le Meur
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Didier Hannequin
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Bertrand Mace
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Jean-Pierre Siffroi
- Department of Medical Genetics and Embryology, Armand-Trousseau Children Hospital, AP-HP, Paris, France
| | - Thierry Frebourg
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Gaël Nicolas
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Géraldine Joly-Helas
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
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Peron A, Catusi I, Recalcati MP, Calzari L, Larizza L, Vignoli A, Canevini MP. Ring Chromosome 20 Syndrome: Genetics, Clinical Characteristics, and Overlapping Phenotypes. Front Neurol 2020; 11:613035. [PMID: 33363513 PMCID: PMC7753021 DOI: 10.3389/fneur.2020.613035] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/09/2020] [Indexed: 12/15/2022] Open
Abstract
Ring chromosome 20 [r(20)] syndrome is a rare condition characterized by a non-supernumerary ring chromosome 20 replacing a normal chromosome 20. It is commonly seen in a mosaic state and is diagnosed by means of karyotyping. r(20) syndrome is characterized by a recognizable epileptic phenotype with typical EEG pattern, intellectual disability manifesting after seizure onset in otherwise normally developing children, and behavioral changes. Despite the distinctive phenotype, many patients still lack a diagnosis-especially in the genomic era-and the pathomechanisms of ring formation are poorly understood. In this review we address the genetic and clinical aspects of r(20) syndrome, and discuss differential diagnoses and overlapping phenotypes, providing the reader with useful tools for clinical and laboratory practice. We also discuss the current issues in understanding the mechanisms through which ring 20 chromosome causes the typical manifestations, and present unpublished data about methylation studies. Ultimately, we explore future perspectives of r(20) research. Our intended audience is clinical and laboratory geneticists, child and adult neurologists, and genetic counselors.
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Affiliation(s)
- Angela Peron
- Human Pathology and Medical Genetics, ASST Santi Paolo e Carlo, San Paolo Hospital, Milan, Italy.,Child Neuropsychiatry Unit - Epilepsy Center, Department of Health Sciences, ASST Santi Paolo e Carlo, San Paolo Hospital, Università Degli Studi di Milano, Milan, Italy.,Division of Medical Genetics, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Ilaria Catusi
- Laboratory of Cytogenetics and Molecular Genetics, Istituto Auxologico Italiano IRCCS-Istituto di Ricovero e Cura a Carattere Scientifico, Cusano Milanino, Milan, Italy
| | - Maria Paola Recalcati
- Laboratory of Cytogenetics and Molecular Genetics, Istituto Auxologico Italiano IRCCS-Istituto di Ricovero e Cura a Carattere Scientifico, Cusano Milanino, Milan, Italy
| | - Luciano Calzari
- Bioinformatics and Statistical Genomics Unit, Istituto Auxologico Italiano IRCCS-Istituto di Ricovero e Cura a Carattere Scientifico, Cusano Milanino, Milan, Italy
| | - Lidia Larizza
- Laboratory of Cytogenetics and Molecular Genetics, Istituto Auxologico Italiano IRCCS-Istituto di Ricovero e Cura a Carattere Scientifico, Cusano Milanino, Milan, Italy
| | - Aglaia Vignoli
- Child Neuropsychiatry Unit - Epilepsy Center, Department of Health Sciences, ASST Santi Paolo e Carlo, San Paolo Hospital, Università Degli Studi di Milano, Milan, Italy
| | - Maria Paola Canevini
- Child Neuropsychiatry Unit - Epilepsy Center, Department of Health Sciences, ASST Santi Paolo e Carlo, San Paolo Hospital, Università Degli Studi di Milano, Milan, Italy
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dos Santos A, Campagnari F, Krepischi ACV, Ribeiro Câmara MDL, de Arruda Brasil RDCE, Vieira L, Vianna-Morgante AM, Otto PA, Pearson PL, Rosenberg C. Insight into the mechanisms and consequences of recurrent telomere capture associated with a sub-telomeric deletion. Chromosome Res 2018; 26:191-198. [DOI: 10.1007/s10577-018-9578-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 11/28/2022]
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Kwon SS, Kim J, Shin S, Lee ST, Lee KA, Choi JR. Deletion of 20p13 and Duplication of 20p13p12.3 in a Patient with Delayed Speech and Development. Ann Lab Med 2017; 38:77-79. [PMID: 29071826 PMCID: PMC5700154 DOI: 10.3343/alm.2018.38.1.77] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 05/10/2017] [Accepted: 09/19/2017] [Indexed: 11/19/2022] Open
Affiliation(s)
- Soon Sung Kwon
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Jieun Kim
- Department of Laboratory Medicine, Soon Chun Hyang University College of Medicine, Seoul, Korea.
| | - Saeam Shin
- Department of Laboratory Medicine, Hallym University College of Medicine, Seoul, Korea
| | - Seung Tae Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Kyung A Lee
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
| | - Jong Rak Choi
- Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea
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Hensel C, Vanzo R, Martin M, Dixon S, Lambert C, Levy B, Nelson L, Peiffer A, Ho KS, Rushton P, Serrano M, South S, Ward K, Wassman E. Analytical and Clinical Validity Study of FirstStepDx PLUS: A Chromosomal Microarray Optimized for Patients with Neurodevelopmental Conditions. PLOS CURRENTS 2017; 9. [PMID: 28357155 PMCID: PMC5346028 DOI: 10.1371/currents.eogt.7d92ce775800ef3fbc72e3840fb1bc22] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Introduction: Chromosomal microarray analysis (CMA) is recognized as the first-tier test in the genetic evaluation of children with developmental delays, intellectual disabilities, congenital anomalies and autism spectrum disorders of unknown etiology. Array Design: To optimize detection of clinically relevant copy number variants associated with these conditions, we designed a whole-genome microarray, FirstStepDx PLUS (FSDX). A set of 88,435 custom probes was added to the Affymetrix CytoScanHD platform targeting genomic regions strongly associated with these conditions. This combination of 2,784,985 total probes results in the highest probe coverage and clinical yield for these disorders. Results and Discussion: Clinical testing of this patient population is validated on DNA from either non-invasive buccal swabs or traditional blood samples. In this report we provide data demonstrating the analytic and clinical validity of FSDX and provide an overview of results from the first 7,570 consecutive patients tested clinically. We further demonstrate that buccal sampling is an effective method of obtaining DNA samples, which may provide improved results compared to traditional blood sampling for patients with neurodevelopmental disorders who exhibit somatic mosaicism.
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Affiliation(s)
| | - Rena Vanzo
- Clinical Genetic Services, Lineagen, Inc., Salt Lake City, Utah, USA
| | | | - Sean Dixon
- Operations, Lineagen, Inc., Salt Lake City, Utah, USA
| | - Christophe Lambert
- Department of Internal Medicine, Center for Global Health, Division of Translational Informatics, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA
| | - Brynn Levy
- Department of Pathology & Cell Biology, Columbia University Medical Center, New York, New York, USA
| | - Lesa Nelson
- Affiliated Genetics Laboratory, Inc., Salt Lake City, Utah, USA
| | - Andy Peiffer
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA; Lineagen, Inc., Salt Lake City, Utah, USA
| | - Karen S Ho
- Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA; Lineagen, Inc., Salt Lake City, Utah, USA
| | | | | | - Sarah South
- ARUP Laboratories, Salt Lake City, Utah, USA; 23andMe, Inc., Mountain View, California, USA
| | - Kenneth Ward
- Affiliated Genetics Laboratory, Inc., Salt Lake City, Utah, USA
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Chromosomal Microarray Analysis of Consecutive Individuals with Autism Spectrum Disorders Using an Ultra-High Resolution Chromosomal Microarray Optimized for Neurodevelopmental Disorders. Int J Mol Sci 2016; 17:ijms17122070. [PMID: 27941670 PMCID: PMC5187870 DOI: 10.3390/ijms17122070] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 11/29/2016] [Accepted: 12/04/2016] [Indexed: 02/07/2023] Open
Abstract
Copy number variants (CNVs) detected by chromosomal microarray analysis (CMA) significantly contribute to understanding the etiology of autism spectrum disorder (ASD) and other related conditions. In recognition of the value of CMA testing and its impact on medical management, CMA is in medical guidelines as a first-tier test in the evaluation of children with these disorders. As CMA becomes adopted into routine care for these patients, it becomes increasingly important to report these clinical findings. This study summarizes the results of over 4 years of CMA testing by a CLIA-certified clinical testing laboratory. Using a 2.8 million probe microarray optimized for the detection of CNVs associated with neurodevelopmental disorders, we report an overall CNV detection rate of 28.1% in 10,351 consecutive patients, which rises to nearly 33% in cases without ASD, with only developmental delay/intellectual disability (DD/ID) and/or multiple congenital anomalies (MCA). The overall detection rate for individuals with ASD is also significant at 24.4%. The detection rate and pathogenic yield of CMA vary significantly with the indications for testing, age, and gender, as well as the specialty of the ordering doctor. We note discrete differences in the most common recurrent CNVs found in individuals with or without a diagnosis of ASD.
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Clinical Performance of an Ultrahigh Resolution Chromosomal Microarray Optimized for Neurodevelopmental Disorders. BIOMED RESEARCH INTERNATIONAL 2016; 2016:3284534. [PMID: 27975050 PMCID: PMC5128689 DOI: 10.1155/2016/3284534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 09/27/2016] [Accepted: 10/20/2016] [Indexed: 11/21/2022]
Abstract
Copy number variants (CNVs) as detected by chromosomal microarray analysis (CMA) significantly contribute to the etiology of neurodevelopmental disorders, such as developmental delay (DD), intellectual disability (ID), and autism spectrum disorder (ASD). This study summarizes the results of 3.5 years of CMA testing by a CLIA-certified clinical testing laboratory 5487 patients with neurodevelopmental conditions were clinically evaluated for rare copy number variants using a 2.8-million probe custom CMA optimized for the detection of CNVs associated with neurodevelopmental disorders. We report an overall detection rate of 29.4% in our neurodevelopmental cohort, which rises to nearly 33% when cases with DD/ID and/or MCA only are considered. The detection rate for the ASD cohort is also significant, at 25%. Additionally, we find that detection rate and pathogenic yield of CMA vary significantly depending on the primary indications for testing, the age of the individuals tested, and the specialty of the ordering doctor. We also report a significant difference between the detection rate on the ultrahigh resolution optimized array in comparison to the array from which it originated. This increase in detection can significantly contribute to the efficient and effective medical management of neurodevelopmental conditions in the clinic.
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Faria RS, de Oliveira CP, da Costa MM, da S Rosa MTA, Córdoba MS, Pic-Taylor A, Ferrari I, de Oliveira SF, Mazzeu JF. Concurrent Loss of Heterozygosity and Mosaic Deletion of 12p13.32pter. Cytogenet Genome Res 2016; 148:174-8. [PMID: 27251740 DOI: 10.1159/000445853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2016] [Indexed: 11/19/2022] Open
Abstract
Deletions in the short arm of chromosome 12 are the rarest subtelomeric imbalances. Less than 20 patients have been reported to date, and their microdeletions were identified either by FISH or array-CGH without SNP data. Here, we report a patient with a 12p13.32pter mosaic deletion detected by chromosome microarray analysis with loss of heterozygosity (LOH) of the deleted segment in addition to the adjacent distal segment. LOH is indicative of a complex rearrangement, suggestive of mitotic microhomology-mediated break-induced replication.
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Affiliation(s)
- Rosana S Faria
- Programas de Px00F3;s-graduax00E7;x00E3;o em Cix00EA;ncias da Sax00FA;de, Universidade de Brasx00ED;lia, Brasx00ED;lia, Brazil
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