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Frewer V, Gilchrist CP, Collins SE, Williams K, Seal ML, Leventer RJ, Amor DJ. A systematic review of brain MRI findings in monogenic disorders strongly associated with autism spectrum disorder. J Child Psychol Psychiatry 2021; 62:1339-1352. [PMID: 34426966 DOI: 10.1111/jcpp.13510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/06/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND Research on monogenic forms of autism spectrum disorder (autism) can inform our understanding of genetic contributions to the autism phenotype; yet, there is much to be learned about the pathways from gene to brain structure to behavior. This systematic review summarizes and evaluates research on brain magnetic resonance imaging (MRI) findings in monogenic conditions that have strong association with autism. This will improve understanding of the impact of genetic variability on brain structure and related behavioral traits in autism. METHODS The search strategy for this systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Risk of bias (ROB) assessment was completed on included studies using the Newcastle-Ottawa Scales. RESULTS Of 4,287 studies screened, 69 were included pertaining to 13 of the top 20 genes with the strongest association with autism. The greatest number of studies related to individuals with PTEN variants and autism. Brain MRI abnormalities were reported for 12 of the 13 genes studied, and in 51.7% of participants across all 13 genes, including 100% of participants with ARID1B variants. Specific MRI findings were highly variable, with no clear patterns emerging within or between the 13 genes, although white matter abnormalities were the most common. Few studies reported specific details about methods for acquisition and processing of brain MRI, and descriptors for brain abnormalities were variable. ROB assessment indicated high ROB for all studies, largely due to small sample sizes and lack of comparison groups. CONCLUSIONS Brain abnormalities are common in this population of individuals, in particular, children; however, a range of different brain abnormalities were reported within and between genes. Directions for future neuroimaging research in monogenic autism are suggested.
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Affiliation(s)
- Veronica Frewer
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,Department of Paediatrics, The University of Melbourne, Parkville, Vic., Australia
| | - Courtney P Gilchrist
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,Neurodevelopment in Health and Disease, RMIT University, Bundoora, Vic., Australia
| | - Simonne E Collins
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,School of Psychological Sciences, Turner Institute for Brain & Mental Health, Monash University, Melbourne, Vic., Australia
| | - Katrina Williams
- Monash University, Melbourne, Vic., Australia.,Monash Children's Hospital, Melbourne, Vic., Australia
| | - Marc L Seal
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,Department of Paediatrics, The University of Melbourne, Parkville, Vic., Australia
| | - Richard J Leventer
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,Department of Paediatrics, The University of Melbourne, Parkville, Vic., Australia.,Royal Children's Hospital, Parkville, Vic., Australia
| | - David J Amor
- Murdoch Children's Research Institute, Parkville, Vic., Australia.,Department of Paediatrics, The University of Melbourne, Parkville, Vic., Australia.,Royal Children's Hospital, Parkville, Vic., Australia
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van der Sluijs PJ, Alders M, Dingemans AJM, Parbhoo K, van Bon BW, Dempsey JC, Doherty D, den Dunnen JT, Gerkes EH, Milller IM, Moortgat S, Regier DS, Ruivenkamp CAL, Schmalz B, Smol T, Stuurman KE, Vincent-Delorme C, de Vries BBA, Sadikovic B, Hickey SE, Rosenfeld JA, Maystadt I, Santen GWE. A Case Series of Familial ARID1B Variants Illustrating Variable Expression and Suggestions to Update the ACMG Criteria. Genes (Basel) 2021; 12:genes12081275. [PMID: 34440449 PMCID: PMC8393241 DOI: 10.3390/genes12081275] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/13/2021] [Accepted: 08/16/2021] [Indexed: 02/07/2023] Open
Abstract
ARID1B is one of the most frequently mutated genes in intellectual disability (~1%). Most variants are readily classified, since they are de novo and are predicted to lead to loss of function, and therefore classified as pathogenic according to the American College of Medical Genetics and Genomics (ACMG) guidelines for the interpretation of sequence variants. However, familial loss-of-function variants can also occur and can be challenging to interpret. Such variants may be pathogenic with variable expression, causing only a mild phenotype in a parent. Alternatively, since some regions of the ARID1B gene seem to be lacking pathogenic variants, loss-of-function variants in those regions may not lead to ARID1B haploinsufficiency and may therefore be benign. We describe 12 families with potential loss-of-function variants, which were either familial or with unknown inheritance and were in regions where pathogenic variants have not been described or are otherwise challenging to interpret. We performed detailed clinical and DNA methylation studies, which allowed us to confidently classify most variants. In five families we observed transmission of pathogenic variants, confirming their highly variable expression. Our findings provide further evidence for an alternative translational start site and we suggest updates for the ACMG guidelines for the interpretation of sequence variants to incorporate DNA methylation studies and facial analyses.
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Affiliation(s)
- Pleuntje J. van der Sluijs
- Department of Clinical Genetics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; (P.J.v.d.S.); (C.A.L.R.)
| | - Mariëlle Alders
- Department of Clinical Genetics, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands;
| | - Alexander J. M. Dingemans
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (A.J.M.D.); (B.B.A.d.V.)
| | - Kareesma Parbhoo
- Division of Genetic & Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (K.P.); (B.S.); (S.E.H.)
| | - Bregje W. van Bon
- Department of Human Genetics, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands;
| | - Jennifer C. Dempsey
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA; (J.C.D.); (D.D.)
| | - Dan Doherty
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA; (J.C.D.); (D.D.)
- Center for Integrative Brain Research, Seattle Children’s Research Institute, Seattle, WA 98101, USA
| | - Johan T. den Dunnen
- Human Genetics and Clinical Genetics, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands;
| | - Erica H. Gerkes
- Department of Genetics, University of Groningen, University Medical Center Groningen, 9700 RB Groningen, The Netherlands;
| | - Ilana M. Milller
- Rare Disease Institute, Children’s National Hospital, Washington, DC 20010, USA; (I.M.M.); (D.S.R.)
| | - Stephanie Moortgat
- Centre de Génétique Humaine, Institut de Pathologie et de Génétique, 6041 Gosselies, Belgium; (S.M.); (I.M.)
| | - Debra S. Regier
- Rare Disease Institute, Children’s National Hospital, Washington, DC 20010, USA; (I.M.M.); (D.S.R.)
| | - Claudia A. L. Ruivenkamp
- Department of Clinical Genetics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; (P.J.v.d.S.); (C.A.L.R.)
| | - Betsy Schmalz
- Division of Genetic & Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (K.P.); (B.S.); (S.E.H.)
| | - Thomas Smol
- EA7364 RADEME, Institut de Génétique Médicale, Université de Lille, CHU de Lille, F-59000 Lille, France;
| | - Kyra E. Stuurman
- Erasmus MC, Department of Clinical Genetics, University Medical Center Rotterdam, 3015 GD Rotterdam, The Netherlands;
| | | | - Bert B. A. de Vries
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (A.J.M.D.); (B.B.A.d.V.)
| | - Bekim Sadikovic
- Verspeeten Clinical Genome Centre and London Health Sciences Centre, Department of Pathology and Laboratory Medicine, Western University, London, ON N6A 3K7, Canada;
| | - Scott E. Hickey
- Division of Genetic & Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (K.P.); (B.S.); (S.E.H.)
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH 43210, USA
| | - Jill A. Rosenfeld
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA;
- Baylor Genetics Laboratories, Houston, TX 77021, USA
| | - Isabelle Maystadt
- Centre de Génétique Humaine, Institut de Pathologie et de Génétique, 6041 Gosselies, Belgium; (S.M.); (I.M.)
| | - Gijs W. E. Santen
- Department of Clinical Genetics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands; (P.J.v.d.S.); (C.A.L.R.)
- Correspondence:
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10
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van der Sluijs PJ, Jansen S, Vergano SA, Adachi-Fukuda M, Alanay Y, AlKindy A, Baban A, Bayat A, Beck-Wödl S, Berry K, Bijlsma EK, Bok LA, Brouwer AFJ, van der Burgt I, Campeau PM, Canham N, Chrzanowska K, Chu YWY, Chung BHY, Dahan K, De Rademaeker M, Destree A, Dudding-Byth T, Earl R, Elcioglu N, Elias ER, Fagerberg C, Gardham A, Gener B, Gerkes EH, Grasshoff U, van Haeringen A, Heitink KR, Herkert JC, den Hollander NS, Horn D, Hunt D, Kant SG, Kato M, Kayserili H, Kersseboom R, Kilic E, Krajewska-Walasek M, Lammers K, Laulund LW, Lederer D, Lees M, López-González V, Maas S, Mancini GMS, Marcelis C, Martinez F, Maystadt I, McGuire M, McKee S, Mehta S, Metcalfe K, Milunsky J, Mizuno S, Moeschler JB, Netzer C, Ockeloen CW, Oehl-Jaschkowitz B, Okamoto N, Olminkhof SNM, Orellana C, Pasquier L, Pottinger C, Riehmer V, Robertson SP, Roifman M, Rooryck C, Ropers FG, Rosello M, Ruivenkamp CAL, Sagiroglu MS, Sallevelt SCEH, Sanchis Calvo A, Simsek-Kiper PO, Soares G, Solaeche L, Sonmez FM, Splitt M, Steenbeek D, Stegmann APA, Stumpel CTRM, Tanabe S, Uctepe E, Utine GE, Veenstra-Knol HE, Venkateswaran S, Vilain C, Vincent-Delorme C, Vulto-van Silfhout AT, Wheeler P, Wilson GN, Wilson LC, Wollnik B, Kosho T, Wieczorek D, Eichler E, Pfundt R, de Vries BBA, Clayton-Smith J, Santen GWE. The ARID1B spectrum in 143 patients: from nonsyndromic intellectual disability to Coffin-Siris syndrome. Genet Med 2018; 21:1295-1307. [PMID: 30349098 PMCID: PMC6752273 DOI: 10.1038/s41436-018-0330-z] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 09/26/2018] [Indexed: 01/09/2023] Open
Abstract
Purpose Pathogenic variants in ARID1B are one of the most frequent causes of intellectual disability (ID) as determined by large-scale exome sequencing studies. Most studies published thus far describe clinically diagnosed Coffin–Siris patients (ARID1B-CSS) and it is unclear whether these data are representative for patients identified through sequencing of unbiased ID cohorts (ARID1B-ID). We therefore sought to determine genotypic and phenotypic differences between ARID1B-ID and ARID1B-CSS. In parallel, we investigated the effect of different methods of phenotype reporting. Methods Clinicians entered clinical data in an extensive web-based survey. Results 79 ARID1B-CSS and 64 ARID1B-ID patients were included. CSS-associated dysmorphic features, such as thick eyebrows, long eyelashes, thick alae nasi, long and/or broad philtrum, small nails and small or absent fifth distal phalanx and hypertrichosis, were observed significantly more often (p < 0.001) in ARID1B-CSS patients. No other significant differences were identified. Conclusion There are only minor differences between ARID1B-ID and ARID1B-CSS patients. ARID1B-related disorders seem to consist of a spectrum, and patients should be managed similarly. We demonstrated that data collection methods without an explicit option to report the absence of a feature (such as most Human Phenotype Ontology-based methods) tended to underestimate gene-related features.
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Affiliation(s)
| | - Sandra Jansen
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Samantha A Vergano
- Division of Medical Genetics and Metabolism, Children's Hospital of the King's Daughters, Norfolk, VA, USA
| | - Miho Adachi-Fukuda
- Department of Pediatrics, St. Marianna University School of Medicine, Kanagawa, Japan
| | - Yasemin Alanay
- School of Medicine, Department of Pediatrics, Pediatric Genetics Unit, Acibadem University, Istanbul, Turkey
| | - Adila AlKindy
- Department of Genetics, Sultan Qaboos University Hospital, Muscat, Oman
| | - Anwar Baban
- Pediatric Cardiology and Cardiac Surgery Department, Bambino Gesù Children Hospital and Research Institute, IRCCS, Rome, Italy
| | - Allan Bayat
- Copenhagen University Hospital Hvidovre, Copenhagen, Denmark
| | - Stefanie Beck-Wödl
- Department of Molecular Genetics and Applied Genomics, University Hospital Tübingen, Tübingen, Germany
| | - Katherine Berry
- Department of Medical Genetics, Shodair Hospital, Helena, MT, USA
| | - Emilia K Bijlsma
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Levinus A Bok
- Department of Pediatrics, Màxima Medical Centre, Veldhoven, The Netherlands
| | - Alwin F J Brouwer
- Department of Paediatrics, Nij Smellinghe Hospital, Drachten, The Netherlands
| | - Ineke van der Burgt
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Philippe M Campeau
- Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Natalie Canham
- North West Thames Regional Genetics Service, Northwick Park Hospital, Harrow, United Kingdom.,Cheshire and Merseyside Regional Genetics Service, Liverpool Women's Hospital, Crown Street, Liverpool, United Kingdom
| | - Krystyna Chrzanowska
- Department of Medical Genetics, The Children's Memorial Health Institute, Warsaw, Poland
| | - Yoyo W Y Chu
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, China
| | - Brain H Y Chung
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, SAR, China
| | - Karin Dahan
- Center for Human Genetics, Institute of Pathology and Genetics, Gosselies, Belgium
| | | | - Anne Destree
- Center for Human Genetics, Institute of Pathology and Genetics, Gosselies, Belgium
| | - Tracy Dudding-Byth
- Hunter Genetics and University of Newcastle, GrowUpWell Priority Research Centre, Newcastle, Australia
| | - Rachel Earl
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - Nursel Elcioglu
- Department of Pediatric Genetics, Marmara University Pendik Hospital, Istanbul, Turkey
| | - Ellen R Elias
- Department of Pediatrics and Genetics, University of Colorado Denver School of Medicine, Aurora, CO, USA
| | - Christina Fagerberg
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | - Alice Gardham
- North West Thames Regional Genetics Service, Northwick Park Hospital, Harrow, United Kingdom
| | - Blanca Gener
- Department of Genetics, Cruces University Hospital, Biocruces Health Research Institute, Vizcayam, Spain
| | - Erica H Gerkes
- University of Groningen, University Medical Center Groningen, Department of Genetics, Groningen, The Netherlands
| | - Ute Grasshoff
- Department of Molecular Genetics and Applied Genomics, University Hospital Tübingen, Tübingen, Germany
| | - Arie van Haeringen
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Karin R Heitink
- Department of Rehabilitation Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Johanna C Herkert
- University of Groningen, University Medical Center Groningen, Department of Genetics, Groningen, The Netherlands
| | | | - Denise Horn
- Institute for Medical Genetics and Human Genetics, Charité Universitätsmedizin, Berlin, Germany
| | - David Hunt
- Wessex Clinical Genetics Service, Princess Anne Hospital, Southampton, United Kingdom
| | - Sarina G Kant
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Mitsuhiro Kato
- Department of Pediatrics, Showa University School of Medicine, Tokyo, Japan
| | - Hülya Kayserili
- Medical Genetics Department, Koç University School of Medicine (KUSoM), İstanbul, Turkey
| | - Rogier Kersseboom
- Department of Clinical Genetics, Sophia Children's Hospital, Erasmus MC, Rotterdam, The Netherlands
| | - Esra Kilic
- Department of Pediatric Genetics, Hematology Oncology Research & Training Children's Hospital, Ankara, Turkey
| | | | - Kylin Lammers
- Department of Medical Genetics, Dayton Children's Hospital, Dayton, OH, USA
| | - Lone W Laulund
- Department of Paediatrics, Odense University Hospital, Odense, Denmark
| | - Damien Lederer
- Center for Human Genetics, Institute of Pathology and Genetics, Gosselies, Belgium
| | - Melissa Lees
- Department of Clinical Genetics, Great Ormond Street Hospital NHS Foundation Trust, London, United Kingdom
| | - Vanesa López-González
- Sección de Genética Médica, Servicio de Pediatria, Hospital Clinico Universitario Virgen de la Arrixaca, IMIB-Arrixaca, CIBERER-ISCIII, Murcia, Spain
| | - Saskia Maas
- Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Grazia M S Mancini
- Department of Clinical Genetics, Sophia Children's Hospital, Erasmus MC, Rotterdam, The Netherlands
| | - Carlo Marcelis
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Francisco Martinez
- Unidad de Genética, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Isabelle Maystadt
- Center for Human Genetics, Institute of Pathology and Genetics, Gosselies, Belgium
| | - Marianne McGuire
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX, USA
| | - Shane McKee
- Northern Ireland Regional Genetics Centre, Belfast City Hospital, Belfast, Ireland
| | - Sarju Mehta
- East Anglian Regional Genetics Service, Cambridge University Hospitals NHS Foundation Trust, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Kay Metcalfe
- Manchester Centre for Genomic Medicine, Division of Evolution and Genomic Sciences, St Mary's Hospital, Manchester University Hospitals NHS Foundation Trust Manchester Academic Health Sciences Centre, Manchester, United Kingdom
| | | | - Seiji Mizuno
- Department of Pediatrics, Central Hospital, Aichi Human Service Center, Kasugai, Aichi, Japan
| | - John B Moeschler
- Department of Pediatrics, Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
| | - Christian Netzer
- Institute of Human Genetics, University Hospital of Cologne, Cologne, Germany
| | - Charlotte W Ockeloen
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Nobuhiko Okamoto
- Department of Medical Genetics, Osaka Women's and Children's Hospital, Osaka, Japan
| | - Sharon N M Olminkhof
- Willem Alexander Children's Hospital, Leiden University Medical Center, Leiden, The Netherlands
| | - Carmen Orellana
- Unidad de Genética, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Laurent Pasquier
- CRMR Déficiences intellectuelles, Service de Génétique Médicale, CLAD Ouest CHU Hôpital Sud, Rennes, France
| | - Caroline Pottinger
- All Wales Medical Genetics Service, Glan Clwyd Hospital, Rhyl, United Kingdom
| | - Vera Riehmer
- Institute of Human Genetics, University Hospital of Cologne, Cologne, Germany
| | | | - Maian Roifman
- Division of Clinical and Metabolic Genetics, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.,The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital, Toronto, ON, Canada
| | | | - Fabienne G Ropers
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Monica Rosello
- Unidad de Genética, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Claudia A L Ruivenkamp
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Suzanne C E H Sallevelt
- Department of Clinical Genetics and GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | | | - Pelin O Simsek-Kiper
- Department of Pediatric Genetics, Ihsan Dogramaci Children's Hospital, Hacettepe University School of Medicine, Ankara, Turkey
| | - Gabriela Soares
- Jacinto de Magalhães Medical Genetics Center, Centro Hospitalar do Porto, Porto, Portugal
| | - Lucia Solaeche
- Departamento de neurometabólicas, Hospital Universitario Son Espases, Palma de Mallorca, Spain
| | - Fatma Mujgan Sonmez
- Karadeniz Technical University, Faculty of Medicine, Dept of Child Neurology, Retired Professor, Trabzon, Turkey
| | - Miranda Splitt
- Northern Genetics Service, Institute of Genetics Medicine, Newcastle upon Tyne, United Kingdom
| | - Duco Steenbeek
- Department of Rehabilitation Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Alexander P A Stegmann
- Department of Clinical Genetics and GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Constance T R M Stumpel
- Department of Clinical Genetics and GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Saori Tanabe
- Division of Pediatrics, Yamagata Prefectural and Sakata Munici pal Hospital Organization Nihon-Kai General Hospital, Sakata, Japan
| | | | - G Eda Utine
- Department of Pediatric Genetics, Ihsan Dogramaci Children's Hospital, Hacettepe University School of Medicine, Ankara, Turkey
| | - Hermine E Veenstra-Knol
- University of Groningen, University Medical Center Groningen, Department of Genetics, Groningen, The Netherlands
| | - Sunita Venkateswaran
- Division of Neurology, Department of Pediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada
| | - Catheline Vilain
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Medical Genetics, Université Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme. ULB Center of Medical Genetics, Université Libre de Bruxelles, Brussels, Belgium
| | | | - Anneke T Vulto-van Silfhout
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Golder N Wilson
- KinderGenome Genetics, Medical City Hospital Dallas, Dallas, TX, USA
| | - Louise C Wilson
- Department of Clinical Genetics, Great Ormond Street Hospital NHS Foundation Trust, London, United Kingdom
| | - Bernd Wollnik
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Tomoki Kosho
- Center for Medical Genetics, Shinshu University Hospital, Matsumoto, Japan
| | - Dagmar Wieczorek
- Institute of Human Genetics, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Evan Eichler
- Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA
| | - Rolph Pfundt
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Bert B A de Vries
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jill Clayton-Smith
- Manchester Centre for Genomic Medicine, Division of Evolution and Genomic Sciences, St Mary's Hospital, Manchester University Hospitals NHS Foundation Trust Manchester Academic Health Sciences Centre, Manchester, United Kingdom
| | - Gijs W E Santen
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands.
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