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Brar BK, Blakemore K, Hertenstein C, Miller JL, Miller KA, Shamseldin H, Maddirevula S, Hays T, Lianoglou B, Dukhovny S, Baker LA, Sparks TN, Wapner R, Alkuraya FS, Norton ME, Jelin AC. The utility of gene sequencing in identifying an underlying genetic disorder in prenatally suspected lower urinary tract obstruction. Prenat Diagn 2024; 44:196-204. [PMID: 37594370 DOI: 10.1002/pd.6425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 07/28/2023] [Accepted: 08/09/2023] [Indexed: 08/19/2023]
Abstract
OBJECTIVE Fetal megacystis generally presents as suspected lower urinary tract obstruction (LUTO), which is associated with severe perinatal morbidity. Genetic etiologies underlying LUTO or a LUTO-like initial presentation are poorly understood. Our objectives are to describe single gene etiologies in fetuses initially ascertained to have suspected LUTO and to elucidate genotype-phenotype correlations. METHODS A retrospective case series of suspected fetal LUTO positive for a molecular diagnosis was collected from five centers in the Fetal Sequencing Consortium. Demographics, sonograms, genetic testing including variant classification, and delivery outcomes were abstracted. RESULTS Seven cases of initially prenatally suspected LUTO-positive for a molecular diagnosis were identified. In no case was the final diagnosis established as urethral obstruction that is, LUTO. All variants were classified as likely pathogenic or pathogenic. Smooth muscle deficiencies involving the bladder wall and interfering with bladder emptying were identified in five cases: MYOCD (2), ACTG2 (2), and MYH11 (1). Other genitourinary and/or non-genitourinary malformations were seen in two cases involving KMT2D (1) and BBS10 (1). CONCLUSION Our series illustrates the value of molecular diagnostics in the workup of fetuses who present with prenatally suspected LUTO but who may have a non-LUTO explanation for their prenatal ultrasound findings.
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Affiliation(s)
- Bobby K Brar
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Karin Blakemore
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Christine Hertenstein
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Jena L Miller
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Kristen A Miller
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Hanan Shamseldin
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Sateesh Maddirevula
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Thomas Hays
- Department of Pediatrics, Division of Neonatology, Columbia University Irving Medical Center, New York, New York, USA
| | - Billie Lianoglou
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California, USA
| | - Stephanie Dukhovny
- Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, Oregon Health and Science University, Portland, Oregon, USA
| | - Linda A Baker
- Department of Urology, Division of Pediatric Urology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Teresa N Sparks
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California, USA
| | - Ronald Wapner
- Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, New York, USA
| | - Fowzan S Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mary E Norton
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California, USA
| | - Angie C Jelin
- Department of Gynecology and Obstetrics, Division of Maternal-Fetal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
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Ziegler A, Ebstein F, Shamseldin H, Prouteau C, Krüger E, Binamer YM, Bonneau D, Alkuraya FS, Martin L. Gain-of-function variants in the KDF1 gene cause hidradenitis suppurativa associated with ectodermal dysplasia by stabilizing IκB kinase α. Br J Dermatol 2023; 189:131-132. [PMID: 37144643 DOI: 10.1093/bjd/ljad075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 03/08/2023] [Accepted: 03/12/2023] [Indexed: 05/06/2023]
Abstract
Keratinocyte differentiation factor (KDF)1 has been shown to cause ectodermal dysplasia with or without hidradenitis suppurativa in a single family. KDF1 is known to regulate epidermal differentiation through its interaction with IκB kinase (IKK)α. We report a novel de novo KDF1 variant (p.His254Tyr) in a 20-year-old male patient presenting with hidradenitis suppurativa and ectodermal dysplasia. We demonstrate that variants in KDF1 associated with hidradenitis suppurativa actually cause pathogenic gain-of-function of KDF1 through upregulation of IKKα. Ectodermal dysplasia may be present in a subset of individuals with hidradenitis suppurativa and should be investigated. Inhibition of IKKα appears to be a suitable therapeutic target for these individuals.
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Affiliation(s)
| | - Frédéric Ebstein
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Ferdinand-Sauerbruch-Straße, 17475 Greifswald, Germany
- Nantes Université, Inserm UMR 1087/CNRS UMR 6291, l'Institut du Thorax, 44000 Nantes, France
| | - Hanan Shamseldin
- Department of Translational Genomics, Center for Genomic Medicine
| | | | - Elke Krüger
- Institut für Medizinische Biochemie und Molekularbiologie (IMBM), Universitätsmedizin Greifswald, Ferdinand-Sauerbruch-Straße, 17475 Greifswald, Germany
| | - Yousef M Binamer
- Department of Dermatology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | | | | | - Ludovic Martin
- Department of Dermatology, University Hospital Angers, 4 rue Larrey, Angers Cedex 9 49333, France
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3
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Saida K, Maroofian R, Sengoku T, Mitani T, Pagnamenta AT, Marafi D, Zaki MS, O'Brien TJ, Karimiani EG, Kaiyrzhanov R, Takizawa M, Ohori S, Leong HY, Akay G, Galehdari H, Zamani M, Romy R, Carroll CJ, Toosi MB, Ashrafzadeh F, Imannezhad S, Malek H, Ahangari N, Tomoum H, Gowda VK, Srinivasan VM, Murphy D, Dominik N, Elbendary HM, Rafat K, Yilmaz S, Kanmaz S, Serin M, Krishnakumar D, Gardham A, Maw A, Rao TS, Alsubhi S, Srour M, Buhas D, Jewett T, Goldberg RE, Shamseldin H, Frengen E, Misceo D, Strømme P, Magliocco Ceroni JR, Kim CA, Yesil G, Sengenc E, Guler S, Hull M, Parnes M, Aktas D, Anlar B, Bayram Y, Pehlivan D, Posey JE, Alavi S, Madani Manshadi SA, Alzaidan H, Al-Owain M, Alabdi L, Abdulwahab F, Sekiguchi F, Hamanaka K, Fujita A, Uchiyama Y, Mizuguchi T, Miyatake S, Miyake N, Elshafie RM, Salayev K, Guliyeva U, Alkuraya FS, Gleeson JG, Monaghan KG, Langley KG, Yang H, Motavaf M, Safari S, Alipour M, Ogata K, Brown AEX, Lupski JR, Houlden H, Matsumoto N. Brain monoamine vesicular transport disease caused by homozygous SLC18A2 variants: A study in 42 affected individuals. Genet Med 2023; 25:90-102. [PMID: 36318270 DOI: 10.1016/j.gim.2022.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 09/15/2022] [Accepted: 09/17/2022] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Brain monoamine vesicular transport disease is an infantile-onset movement disorder that mimics cerebral palsy. In 2013, the homozygous SLC18A2 variant, p.Pro387Leu, was first reported as a cause of this rare disorder, and dopamine agonists were efficient for treating affected individuals from a single large family. To date, only 6 variants have been reported. In this study, we evaluated genotype-phenotype correlations in individuals with biallelic SLC18A2 variants. METHODS A total of 42 affected individuals with homozygous SLC18A2 variant alleles were identified. We evaluated genotype-phenotype correlations and the missense variants in the affected individuals based on the structural modeling of rat VMAT2 encoded by Slc18a2, with cytoplasm- and lumen-facing conformations. A Caenorhabditis elegans model was created for functional studies. RESULTS A total of 19 homozygous SLC18A2 variants, including 3 recurrent variants, were identified using exome sequencing. The affected individuals typically showed global developmental delay, hypotonia, dystonia, oculogyric crisis, and autonomic nervous system involvement (temperature dysregulation/sweating, hypersalivation, and gastrointestinal dysmotility). Among the 58 affected individuals described to date, 16 (28%) died before the age of 13 years. Of the 17 patients with p.Pro237His, 9 died, whereas all 14 patients with p.Pro387Leu survived. Although a dopamine agonist mildly improved the disease symptoms in 18 of 21 patients (86%), some affected individuals with p.Ile43Phe and p.Pro387Leu showed milder phenotypes and presented prolonged survival even without treatment. The C. elegans model showed behavioral abnormalities. CONCLUSION These data expand the phenotypic and genotypic spectra of SLC18A2-related disorders.
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Affiliation(s)
- Ken Saida
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Reza Maroofian
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Toru Sengoku
- Department of Biochemistry, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Tadahiro Mitani
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX
| | - Alistair T Pagnamenta
- NIHR Oxford Biomedical Research Centre, Wellcome Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
| | - Dana Marafi
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Department of Pediatrics, Faculty of Medicine, Kuwait University, Safat, Kuwait
| | - Maha S Zaki
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Thomas J O'Brien
- MRC London Institute of Medical Sciences, London, United Kingdom; Faculty of Medicine, Institute of Clinical Sciences, Imperial College London, London, United Kingdom
| | - Ehsan Ghayoor Karimiani
- Molecular and Clinical Sciences Research Institute, St. George's, University of London, London, United Kingdom; Innovative Medical Research Center, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Rauan Kaiyrzhanov
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Marina Takizawa
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Sachiko Ohori
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Huey Yin Leong
- Genetics Department, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia
| | - Gulsen Akay
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX
| | - Hamid Galehdari
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Mina Zamani
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Ratna Romy
- Molecular and Clinical Sciences Research Institute, St. George's, University of London, London, United Kingdom
| | - Christopher J Carroll
- Molecular and Clinical Sciences Research Institute, St. George's, University of London, London, United Kingdom
| | - Mehran Beiraghi Toosi
- Department of Pediatrics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran; Neuroscience Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farah Ashrafzadeh
- Department of Pediatrics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Shima Imannezhad
- Department of Pediatric Neurology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hadis Malek
- Department of Medical Genetics, Next Generation Genetic Polyclinic, Mashhad, Iran
| | - Najmeh Ahangari
- Department of Medical Genetics, Next Generation Genetic Polyclinic, Mashhad, Iran
| | - Hoda Tomoum
- Department of Pediatrics, Ain Shams University, Cairo, Egypt
| | - Vykuntaraju K Gowda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bangalore, India
| | | | - David Murphy
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Natalia Dominik
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Hasnaa M Elbendary
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Karima Rafat
- Department of Clinical Genetics, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Sanem Yilmaz
- Division of Pediatric Neurology, Department of Pediatrics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Seda Kanmaz
- Division of Pediatric Neurology, Department of Pediatrics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Mine Serin
- Division of Pediatric Neurology, Department of Pediatrics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Deepa Krishnakumar
- North West Thames Regional Genetics Service, Northwick Park Hospital, London, United Kingdom
| | - Alice Gardham
- North West Thames Regional Genetics Service, Northwick Park Hospital, London, United Kingdom
| | - Anna Maw
- Department of Paediatric Neurology, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Tekki Sreenivasa Rao
- Department of Paediatrics, Luton and Dunstable University Hospital, Luton, United Kingdom
| | - Sarah Alsubhi
- Division of Pediatric Neurology, Departments of Pediatrics, McGill University, Montreal, Quebec, Canada
| | - Myriam Srour
- Division of Pediatric Neurology, Departments of Pediatrics, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill University Health Center (MUHC), Montreal, Quebec, Canada
| | - Daniela Buhas
- Division of Medical Genetics, Department of Specialized Medicine, McGill University Health Center (MUHC), Montreal, Quebec, Canada; Department of Human Genetics, McGill University, Montreal, Quebec, Canada
| | - Tamison Jewett
- Department of Pediatrics, Section on Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, NC
| | - Rachel E Goldberg
- Department of Pediatrics, Section on Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, NC
| | - Hanan Shamseldin
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Eirik Frengen
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Doriana Misceo
- Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Petter Strømme
- Division of Pediatric and Adolescent Medicine, Oslo University Hospital and University of Oslo, Oslo, Norway
| | | | - Chong Ae Kim
- Genetic Unit, Instituto da Crianca, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Gozde Yesil
- Department of Medical Genetics, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Esma Sengenc
- Department of Pediatric Neurology, Faculty of Medicine, Bezmialem Vakif University, Istanbul, Turkey
| | - Serhat Guler
- Department of Child Neurology, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey
| | | | | | - Dilek Aktas
- Damagen Genetic Diagnostic Center, Ankara, Turkey
| | - Banu Anlar
- Department of Pediatric Neurology, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Yavuz Bayram
- Division of Genomic Diagnostics, Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, PA; Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Davut Pehlivan
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Texas Children's Hospital, Houston, TX; Division of Pediatric Neurology and Developmental Neuroscience, Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Jennifer E Posey
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX
| | - Shahryar Alavi
- Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | | | - Hamad Alzaidan
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mohammad Al-Owain
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Lama Alabdi
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia; Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ferdous Abdulwahab
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Futoshi Sekiguchi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Kohei Hamanaka
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Atsushi Fujita
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Yuri Uchiyama
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Department of Rare Disease Genomics, Yokohama City University Hospital, Yokohama, Japan
| | - Takeshi Mizuguchi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Satoko Miyatake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Clinical Genetics Department, Yokohama City University Hospital, Yokohama, Japan
| | - Noriko Miyake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Department of Human Genetics, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | | | - Kamran Salayev
- Department of Neurology, Azerbaijan Medical University, Baku, Azerbaijan
| | | | - Fowzan S Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia; Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Joseph G Gleeson
- Department of Neurosciences, University of California San Diego, San Diego, CA; Rady Children's Institute for Genomic Medicine, San Diego, CA
| | | | | | | | - Mahsa Motavaf
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saeid Safari
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mozhgan Alipour
- Functional Neurosurgery Research Center, Shohada Tajrish Comprehensive Neurosurgical Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Kazuhiro Ogata
- Department of Biochemistry, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - André E X Brown
- MRC London Institute of Medical Sciences, London, United Kingdom; Faculty of Medicine, Institute of Clinical Sciences, Imperial College London, London, United Kingdom
| | - James R Lupski
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX; Texas Children's Hospital, Houston, TX; Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX; Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Henry Houlden
- Department of Neuromuscular Disorders, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
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4
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Brar B, Blakemore K, Hertenstein C, Miller JL, Miller K, Shamseldin H, Alkuraya F, Lianoglou BR, Sparks TN, Norton ME, Jelin A. Molecular diagnoses in fetuses with megacystis/LUTO by prenatal ultrasound. Am J Obstet Gynecol 2023. [DOI: 10.1016/j.ajog.2022.11.491] [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: 01/09/2023]
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Broly M, Polevoda BV, Awayda KM, Tong N, Lentini J, Besnard T, Deb W, O’Rourke D, Baptista J, Ellard S, Almannai M, Hashem M, Abdulwahab F, Shamseldin H, Al-Tala S, Alkuraya FS, Leon A, van Loon RL, Ferlini A, Sanchini M, Bigoni S, Ciorba A, van Bokhoven H, Iqbal Z, Al-Maawali A, Al-Murshedi F, Ganesh A, Al-Mamari W, Lim SC, Pais LS, Brown N, Riazuddin S, Bézieau S, Fu D, Isidor B, Cogné B, O’Connell MR. THUMPD1 bi-allelic variants cause loss of tRNA acetylation and a syndromic neurodevelopmental disorder. Am J Hum Genet 2022; 109:587-600. [PMID: 35196516 DOI: 10.1016/j.ajhg.2022.02.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 02/01/2022] [Indexed: 12/16/2022] Open
Abstract
Covalent tRNA modifications play multi-faceted roles in tRNA stability, folding, and recognition, as well as the rate and fidelity of translation, and other cellular processes such as growth, development, and stress responses. Mutations in genes that are known to regulate tRNA modifications lead to a wide array of phenotypes and diseases including numerous cognitive and neurodevelopmental disorders, highlighting the critical role of tRNA modification in human disease. One such gene, THUMPD1, is involved in regulating tRNA N4-acetylcytidine modification (ac4C), and recently was proposed as a candidate gene for autosomal-recessive intellectual disability. Here, we present 13 individuals from 8 families who harbor rare loss-of-function variants in THUMPD1. Common phenotypic findings included global developmental delay, speech delay, moderate to severe intellectual deficiency, behavioral abnormalities such as angry outbursts, facial dysmorphism, and ophthalmological abnormalities. We demonstrate that the bi-allelic variants identified cause loss of function of THUMPD1 and that this defect results in a loss of ac4C modification in small RNAs, and of individually purified tRNA-Ser-CGA. We further corroborate this effect by showing a loss of tRNA acetylation in two CRISPR-Cas9-generated THUMPD1 KO cell lines. In addition, we also show the resultant amino acid substitution that occurs in a missense THUMPD1 allele identified in an individual with compound heterozygous variants results in a marked decrease in THUMPD1 stability and RNA-binding capacity. Taken together, these results suggest that the lack of tRNA acetylation due to THUMPD1 loss of function results in a syndromic form of intellectual disability associated with developmental delay, behavioral abnormalities, hearing loss, and facial dysmorphism.
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6
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Magrinelli F, Cali E, Braga VL, Yis U, Tomoum H, Shamseldin H, Raiman J, Kernstock C, Rezende Filho FM, Barsottini OGP, Taylor RW, Østergaard E, Tamim A, Schäferhoff K, Sallum JMF, Zaki MS, Kok F, Bhatia KP, Wissinger B, Sergeant K, Haack TB, Horvath R, Hiz S, Alkuraya FS, Houlden H, Pedroso JL, Maroofian R. Biallelic Loss-of-Function NDUFA12 Variants Cause a Wide Phenotypic Spectrum from Leigh/Leigh-Like Syndrome to Isolated Optic Atrophy. Mov Disord Clin Pract 2022; 9:218-228. [PMID: 35141356 PMCID: PMC8810437 DOI: 10.1002/mdc3.13398] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/28/2021] [Accepted: 12/11/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Biallelic loss-of-function NDUFA12 variants have hitherto been linked to mitochondrial complex I deficiency presenting with heterogeneous clinical and radiological features in nine cases only. OBJECTIVES To fully characterize, both phenotypically and genotypically, NDUFA12-related mitochondrial disease. METHODS We collected data from cases identified by screening genetic databases of several laboratories worldwide and systematically reviewed the literature. RESULTS Nine unreported NDUFA12 cases from six pedigrees were identified, with presentation ranging from movement disorder phenotypes (dystonia and/or spasticity) to isolated optic atrophy. MRI showed basal ganglia abnormalities (n = 6), optic atrophy (n = 2), or was unremarkable (n = 1). All carried homozygous truncating NDUFA12 variants, three of which are novel. CONCLUSIONS Our case series expands phenotype-genotype correlations in NDUFA12-associated mitochondrial disease, providing evidence of intra- and inter-familial clinical heterogeneity for the same variant. It confirms NDUFA12 variants should be included in the diagnostic workup of Leigh/Leigh-like syndromes - particularly with dystonia - as well as isolated optic atrophy.
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Affiliation(s)
- Francesca Magrinelli
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of NeurologyUniversity College LondonLondonUnited Kingdom
- Department of Neurosciences, Biomedicine and Movement SciencesUniversity of VeronaVeronaItaly
| | - Elisa Cali
- Department of Neuromuscular DiseasesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
| | | | - Uluç Yis
- Division of Pediatric Neurology, Department of PediatricsDokuz Eylül University Faculty of MedicineİzmirTurkey
| | - Hoda Tomoum
- Department of PediatricsAin Shams UniversityCairoEgypt
| | - Hanan Shamseldin
- Department of GeneticsKing Faisal Specialist Hospital and Research CenterRiyadhSaudi Arabia
| | - Julian Raiman
- Department of Inherited Metabolic DiseaseBirmingham Children's HospitalBirminghamUnited Kingdom
| | - Christoph Kernstock
- Center for OphthalmologyInstitute for Ophthalmic Research, University of TübingenTübingenGermany
| | | | | | - Robert W. Taylor
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Faculty of Medical SciencesNewcastle UniversityNewcastle upon TyneUnited Kingdom
| | - Elsebet Østergaard
- Department of Clinical GeneticsCopenhagen University Hospital RigshospitaletCopenhagenDenmark
- Department of Clinical MedicineUniversity of CopenhagenCopenhagenDenmark
| | - Abdullah Tamim
- Department of Pediatric NeurologyKing Faisal Specialist Hospital and Research CenterRiyadhSaudi Arabia
| | - Karin Schäferhoff
- Institute of Human Genetics and Applied GenomicsUniversity of TübingenTübingenGermany
| | | | - Maha S. Zaki
- Clinical Genetics Department, Human Genetics and Genome Research InstituteNational Research CentreCairoEgypt
| | - Fernando Kok
- Department of NeurologyUniversidade de São Paulo (USP)São PauloBrazil
- Mendelics Genomic AnalysisSão PauloBrazil
| | - Kailash P. Bhatia
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of NeurologyUniversity College LondonLondonUnited Kingdom
| | - Bernd Wissinger
- Center for OphthalmologyInstitute for Ophthalmic Research, University of TübingenTübingenGermany
| | - Kate Sergeant
- Oxford Genetics LaboratoriesOxford University Hospitals NHS Foundation TrustOxfordUnited Kingdom
| | - Tobias B. Haack
- Institute of Human Genetics and Applied GenomicsUniversity of TübingenTübingenGermany
- Centre for Rare DiseasesUniversity of TübingenTübingenGermany
| | - Rita Horvath
- Department of Clinical NeurosciencesUniversity of Cambridge, John Van Geest Cambridge Centre for Brain RepairCambridgeUnited Kingdom
| | - Semra Hiz
- Division of Pediatric Neurology, Department of PediatricsDokuz Eylül University Faculty of MedicineİzmirTurkey
| | - Fowzan S. Alkuraya
- Department of Translational GenomicsCenter for Genomic Medicine, King Faisal Specialist Hospital and Research CenterRiyadhSaudi Arabia
- Department of Anatomy and Cell BiologyCollege of Medicine, Alfaisal UniversityRiyadhSaudi Arabia
| | - Henry Houlden
- Department of Neuromuscular DiseasesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
| | - José Luiz Pedroso
- Department of NeurologyUniversidade Federal de São PauloSão PauloBrazil
| | - Reza Maroofian
- Department of Neuromuscular DiseasesUCL Queen Square Institute of Neurology, University College LondonLondonUnited Kingdom
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Wiessner M, Maroofian R, Ni MY, Pedroni A, Müller JS, Stucka R, Beetz C, Efthymiou S, Santorelli FM, Alfares AA, Zhu C, Uhrova Meszarosova A, Alehabib E, Bakhtiari S, Janecke AR, Otero MG, Chen JYH, Peterson JT, Strom TM, De Jonghe P, Deconinck T, De Ridder W, De Winter J, Pasquariello R, Ricca I, Alfadhel M, van de Warrenburg BP, Portier R, Bergmann C, Ghasemi Firouzabadi S, Jin SC, Bilguvar K, Hamed S, Abdelhameed M, Haridy NA, Maqbool S, Rahman F, Anwar N, Carmichael J, Pagnamenta AT, Wood NW, Tran Mau-Them F, Haack T, Di Rocco M, Ceccherini I, Iacomino M, Zara F, Salpietro V, Scala M, Rusmini M, Xu Y, Wang Y, Suzuki Y, Koh K, Nan H, Ishiura H, Tsuji S, Lambert L, Schmitt E, Lacaze E, Küpper H, Dredge D, Skraban C, Goldstein A, Willis MJH, Grand K, Graham JM, Lewis RA, Millan F, Duman Ö, Olgac Dundar N, Uyanik G, Schöls L, Nürnberg P, Nürnberg G, Català-Bordes A, Seeman P, Kuchar M, Darvish H, Rebelo A, Bouçanova F, Medard JJ, Chrast R, Auer-Grumbach M, Alkuraya FS, Shamseldin H, Al Tala S, Rezazadeh Varaghchi J, Najafi M, Deschner S, Gläser D, Hüttel W, Kruer MC, Kamsteeg EJ, Takiyama Y, Züchner S, Baets J, Synofzik M, Schüle R, Horvath R, Houlden H, Bartesaghi L, Lee HJ, Ampatzis K, Pierson TM, Senderek J. Erratum to: Biallelic variants in HPDL cause pure and complicated hereditary spastic paraplegia. Brain 2021; 144:e70. [PMID: 34480796 DOI: 10.1093/brain/awab193] [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] [Received: 05/13/2021] [Indexed: 11/13/2022] Open
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8
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Ali Alghamdi M, Alrasheedi A, Alghamdi E, Adly N, AlAali WY, Alhashem A, Alshahrani A, Shamseldin H, Alkuraya FS, Alfadhel M. Molecular autopsy by proxy in preconception counseling. Clin Genet 2021; 100:678-691. [PMID: 34406647 PMCID: PMC9290025 DOI: 10.1111/cge.14049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/15/2021] [Accepted: 08/17/2021] [Indexed: 01/06/2023]
Abstract
Monogenic diseases that result in early pregnancy loss or neonatal death are genetically and phenotypically highly variable. This often poses significant challenges in arriving at a molecular diagnosis for reproductive planning. Molecular autopsy by proxy (MABP) refers to the genetic testing of relatives of deceased individuals to deduce the cause of death. Here, we specifically tested couples who lost one or more children/pregnancies with no available DNA. We developed our testing strategy using whole exome sequencing data from 83 consanguineous Saudi couples. We detected the shared carrier state of 50 pathogenic variants/likely pathogenic variants in 43 families and of 28 variants of uncertain significance in 24 families. Negative results were seen in 16 couples after variant reclassification. In 10 families, the risk of more than one genetic disease was documented. Secondary findings were seen in 10 families: either genetic variants with potential clinical consequences for the tested individual or a female carrier for X‐linked conditions. This couple‐based approach has enabled molecularly informed genetic counseling for 52% (43/83 families). Given the predominance of autosomal recessive causes of pregnancy and child death in consanguineous populations, MABP can be a helpful approach to consanguineous couples who seek counseling but lack molecular data on their deceased offspring.
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Affiliation(s)
- Malak Ali Alghamdi
- Medical Genetic Division, Pediatric Department, College of Medicine, King Saud University, Riyadh, Saudi Arabia.,Medical Genetics Division, Department of Pediatrics, King Saud University Medical City, Riyadh, Saudi Arabia
| | - Ameinah Alrasheedi
- Department of Pediatrics, College of Medicine and Medical Sciences, Qassim University, Al Qassim, Saudi Arabia
| | - Esra Alghamdi
- College of Medicine, Imam Mohammed Ibn Saud Islamic University, Riyadh, Saudi Arabia
| | - Nouran Adly
- College of Medicine Research Center, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Wajeih Y AlAali
- Dr. Sulaiman Al Habib Medical Group, Riyadh, Saudi Arabia.,Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Amal Alhashem
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | | | - Hanan Shamseldin
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Fowzan S Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Majid Alfadhel
- King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia.,Genetics and Precision Medicine department, King Abdullah Specialized Children Hospital, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia
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9
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Wiessner M, Maroofian R, Ni MY, Pedroni A, Müller JS, Stucka R, Beetz C, Efthymiou S, Santorelli FM, Alfares AA, Zhu C, Uhrova Meszarosova A, Alehabib E, Bakhtiari S, Janecke AR, Otero MG, Chen JYH, Peterson JT, Strom TM, De Jonghe P, Deconinck T, De Ridder W, De Winter J, Pasquariello R, Ricca I, Alfadhel M, van de Warrenburg BP, Portier R, Bergmann C, Ghasemi Firouzabadi S, Jin SC, Bilguvar K, Hamed S, Abdelhameed M, Haridy NA, Maqbool S, Rahman F, Anwar N, Carmichael J, Pagnamenta A, Wood NW, Tran Mau-Them F, Haack T, Di Rocco M, Ceccherini I, Iacomino M, Zara F, Salpietro V, Scala M, Rusmini M, Xu Y, Wang Y, Suzuki Y, Koh K, Nan H, Ishiura H, Tsuji S, Lambert L, Schmitt E, Lacaze E, Küpper H, Dredge D, Skraban C, Goldstein A, Willis MJH, Grand K, Graham JM, Lewis RA, Millan F, Duman Ö, Dündar N, Uyanik G, Schöls L, Nürnberg P, Nürnberg G, Catala Bordes A, Seeman P, Kuchar M, Darvish H, Rebelo A, Bouçanova F, Medard JJ, Chrast R, Auer-Grumbach M, Alkuraya FS, Shamseldin H, Al Tala S, Rezazadeh Varaghchi J, Najafi M, Deschner S, Gläser D, Hüttel W, Kruer MC, Kamsteeg EJ, Takiyama Y, Züchner S, Baets J, Synofzik M, Schüle R, Horvath R, Houlden H, Bartesaghi L, Lee HJ, Ampatzis K, Pierson TM, Senderek J. Biallelic variants in HPDL cause pure and complicated hereditary spastic paraplegia. Brain 2021; 144:1422-1434. [PMID: 33970200 PMCID: PMC8219359 DOI: 10.1093/brain/awab041] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 11/04/2020] [Accepted: 12/02/2020] [Indexed: 01/19/2023] Open
Abstract
Human 4-hydroxyphenylpyruvate dioxygenase-like (HPDL) is a putative iron-containing non-heme oxygenase of unknown specificity and biological significance. We report 25 families containing 34 individuals with neurological disease associated with biallelic HPDL variants. Phenotypes ranged from juvenile-onset pure hereditary spastic paraplegia to infantile-onset spasticity and global developmental delays, sometimes complicated by episodes of neurological and respiratory decompensation. Variants included bona fide pathogenic truncating changes, although most were missense substitutions. Functionality of variants could not be determined directly as the enzymatic specificity of HPDL is unknown; however, when HPDL missense substitutions were introduced into 4-hydroxyphenylpyruvate dioxygenase (HPPD, an HPDL orthologue), they impaired the ability of HPPD to convert 4-hydroxyphenylpyruvate into homogentisate. Moreover, three additional sets of experiments provided evidence for a role of HPDL in the nervous system and further supported its link to neurological disease: (i) HPDL was expressed in the nervous system and expression increased during neural differentiation; (ii) knockdown of zebrafish hpdl led to abnormal motor behaviour, replicating aspects of the human disease; and (iii) HPDL localized to mitochondria, consistent with mitochondrial disease that is often associated with neurological manifestations. Our findings suggest that biallelic HPDL variants cause a syndrome varying from juvenile-onset pure hereditary spastic paraplegia to infantile-onset spastic tetraplegia associated with global developmental delays.
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Affiliation(s)
- Manuela Wiessner
- Friedrich-Baur-Institute, Department of Neurology, LMU Munich, Munich, Germany
| | - Reza Maroofian
- Department of Neuromuscular Disorders, Institute of Neurology, University College London, London, UK
| | - Meng-Yuan Ni
- Department of Biochemistry, National Defense Medical Center, Neihu, Taipei, Taiwan
| | - Andrea Pedroni
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Juliane S Müller
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Rolf Stucka
- Friedrich-Baur-Institute, Department of Neurology, LMU Munich, Munich, Germany
| | - Christian Beetz
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Stephanie Efthymiou
- Department of Neuromuscular Disorders, Institute of Neurology, University College London, London, UK
| | | | - Ahmed A Alfares
- Department of Pediatrics, College of Medicine, Qassim University, Qassim, Saudi Arabia
| | - Changlian Zhu
- Henan Key Laboratory of Child Brain Injury, Institute of Neuroscience and Third Affliated Hospital of Zhengzhou University, Zhengzhou, China
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Göteborg, Sweden
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Anna Uhrova Meszarosova
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Elham Alehabib
- Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Somayeh Bakhtiari
- Barrow Neurological Institute, Phoenix Children's Hospital and University of Arizona College of Medicine, Phoenix, USA
| | - Andreas R Janecke
- Department of Pediatrics I, Medical University of Innsbruck, Innsbruck, Austria
- Division of Human Genetics, Medical University of Innsbruck, Innsbruck, Austria
| | - Maria Gabriela Otero
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, Los Angeles, USA
| | | | - James T Peterson
- Mitochondrial Medicine Frontier Program, Children's Hospital of Philadelphia, Philadelphia, USA
| | - Tim M Strom
- Institute of Human Genetics, Technische Universität Mänchen, Munich, Germany
| | - Peter De Jonghe
- Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerpen, Belgium
- Laboratory of Neuromuscular Pathology, Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerpen, Belgium
| | - Tine Deconinck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerpen, Belgium
| | - Willem De Ridder
- Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerpen, Belgium
- Laboratory of Neuromuscular Pathology, Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerpen, Belgium
| | - Jonathan De Winter
- Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerpen, Belgium
- Laboratory of Neuromuscular Pathology, Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerpen, Belgium
| | | | - Ivana Ricca
- Molecular Medicine Unit, IRCCS Fondazione Stella Maris, Pisa, Italy
| | - Majid Alfadhel
- Genetics Division, Department of Pediatrics, King Abdullah International Medical Research Center (KAIMRC), King Saud bin Abdulaziz University for Health Sciences, King Abdulaziz Medical City, Ministry of National Guard Health Affairs (MNG-HA), Riyadh, Saudi Arabia
| | - Bart P van de Warrenburg
- Department of Neurology, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Ruben Portier
- Polikliniek Neurologie Enschede, Medisch Spectrum Twente, Enschede, The Netherlands
| | - Carsten Bergmann
- Medizinische Genetik Mainz, Limbach Genetics, Mainz, Germany
- Department of Medicine, Nephrology, University Hospital Freiburg, Germany
| | | | - Sheng Chih Jin
- Department of Genetics, Washington University School of Medicine, St. Louis, USA
| | - Kaya Bilguvar
- Department of Genetics, Yale University School of Medicine, New Haven, USA
- Yale Center for Genome Analysis, Yale University, New Haven, USA
| | - Sherifa Hamed
- Department of Neurology and Psychiatry, Assiut University Hospital, Assiut, Egypt
| | - Mohammed Abdelhameed
- Department of Neurology and Psychiatry, Assiut University Hospital, Assiut, Egypt
| | - Nourelhoda A Haridy
- Department of Neuromuscular Disorders, Institute of Neurology, University College London, London, UK
- Department of Neurology and Psychiatry, Assiut University Hospital, Assiut, Egypt
| | - Shazia Maqbool
- Development and Behavioural Paediatrics Department, Institute of Child Health and The Children Hospital, Lahore, Pakistan
| | - Fatima Rahman
- Development and Behavioural Paediatrics Department, Institute of Child Health and The Children Hospital, Lahore, Pakistan
| | - Najwa Anwar
- Development and Behavioural Paediatrics Department, Institute of Child Health and The Children Hospital, Lahore, Pakistan
| | - Jenny Carmichael
- Oxford Regional Clinical Genetics Service, Northampton General Hospital, Northampton, UK
| | - Alistair Pagnamenta
- NIHR Oxford BRC, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Nick W Wood
- Department of Neuromuscular Disorders, Institute of Neurology, University College London, London, UK
- The National Hospital for Neurology and Neurosurgery, London, UK
| | - Frederic Tran Mau-Them
- Unité Fonctionnelle 6254 d'Innovation en Diagnostique Génomique des Maladies Rares, Pôle de Biologie, CHU Dijon Bourgogne, Dijon, France
| | - Tobias Haack
- Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen, Germany
| | | | - Maja Di Rocco
- Rare Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Isabella Ceccherini
- Genetics and Genomics of Rare Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Michele Iacomino
- Medical Genetics Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Federico Zara
- Medical Genetics Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genoa, Italy
| | - Vincenzo Salpietro
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genoa, Italy
- Pediatric Neurology and Neuromuscular Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Marcello Scala
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DINOGMI), University of Genoa, Genoa, Italy
- Pediatric Neurology and Neuromuscular Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Marta Rusmini
- Genetics and Genomics of Rare Diseases Unit, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Yiran Xu
- Henan Key Laboratory of Child Brain Injury, Institute of Neuroscience and Third Affliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yinghong Wang
- Department of Pediatrics, The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
| | - Yasuhiro Suzuki
- Department of Pediatric Neurology, Osaka Women's and Children's Hospital, Osaka, Japan
| | - Kishin Koh
- Department of Neurology, Graduate School of Medical Sciences, University of Yamanashi, Yamanashi, Japan
| | - Haitian Nan
- Department of Neurology, Graduate School of Medical Sciences, University of Yamanashi, Yamanashi, Japan
| | - Hiroyuki Ishiura
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shoji Tsuji
- Institute of Medical Genomics, International University of Health and Welfare, Chiba, Japan
| | - Laëtitia Lambert
- Department of Clinical Genetics, CHRU Nancy, UMR_S INSERM N-GERE 1256, Université de Lorraine - Faculté de Médecine, Nancy, France
| | | | - Elodie Lacaze
- Department of Medical Genetics, Le Havre Hospital, Le Havre, France
| | - Hanna Küpper
- Department of Pediatric Neurology, University Children's Hospital Tübingen, Tübingen, Germany
| | - David Dredge
- Neurology Department, Massachusetts General Hospital, Boston, USA
| | - Cara Skraban
- Roberts Individualized Medical Genetics Center, Division of Human Genetics, Children's Hospital of Philadelphia, Philadelphia, USA
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
| | - Amy Goldstein
- Mitochondrial Medicine Frontier Program, Children's Hospital of Philadelphia, Philadelphia, USA
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
| | - Mary J H Willis
- Department of Pediatrics, Naval Medical Center San Diego, San Diego, USA
| | - Katheryn Grand
- Department of Pediatrics, Medical Genetics, Cedars-Sinai Medical Center, Los Angeles, USA
| | - John M Graham
- Department of Pediatrics, Medical Genetics, Cedars-Sinai Medical Center, Los Angeles, USA
| | - Richard A Lewis
- Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, USA
| | | | - Özgür Duman
- Department of Pediatric Neurology, Akdeniz University Hospital, Antalya, Turkey
| | - Nihal Dündar
- Department of Pediatric Neurology, Izmir Katip Celebi University, Izmir, Turkey
| | - Gökhan Uyanik
- Center for Medical Genetics, Hanusch Hospital, Vienna, Austria
- Medical School, Sigmund Freud Private University, Vienna, Austria
| | - Ludger Schöls
- Hertie Institute for Clinical Brain Research (HIH), Center of Neurology, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), University of Tübingen, Tübingen, Germany
| | - Peter Nürnberg
- Cologne Center for Genomics, Faculty of Medicine and Cologne University Hospital, University of Cologne, Cologne, Germany
| | - Gudrun Nürnberg
- Cologne Center for Genomics, Faculty of Medicine and Cologne University Hospital, University of Cologne, Cologne, Germany
| | - Andrea Catala Bordes
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Pavel Seeman
- DNA Laboratory, Department of Paediatric Neurology, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic
| | - Martin Kuchar
- Department of Paediatric Neurology, Liberec Hospital, Liberec, Czech Republic
| | - Hossein Darvish
- Neuroscience Research Center, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Adriana Rebelo
- Dr. John T. Macdonald Foundation Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, USA
| | - Filipa Bouçanova
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Jean-Jacques Medard
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Roman Chrast
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Michaela Auer-Grumbach
- Department of Orthopaedics and Traumatology, Medical University of Vienna, Vienna, Austria
| | - Fowzan S Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Hanan Shamseldin
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Saeed Al Tala
- Department of Pediatrics, Genetic Unit, Armed Forces Hospital, Khamis Mushayt, Saudi Arabia
| | | | - Maryam Najafi
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Dieter Gläser
- genetikum, Center for Human Genetics, Neu-Ulm, Germany
| | - Wolfgang Hüttel
- Institut für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Freibug, Germany
| | - Michael C Kruer
- Barrow Neurological Institute, Phoenix Children's Hospital and University of Arizona College of Medicine, Phoenix, USA
| | - Erik-Jan Kamsteeg
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Yoshihisa Takiyama
- Department of Neurology, Graduate School of Medical Sciences, University of Yamanashi, Yamanashi, Japan
| | - Stephan Züchner
- Dr. John T. Macdonald Foundation Department of Human Genetics, John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, USA
| | - Jonathan Baets
- Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerpen, Belgium
- Laboratory of Neuromuscular Pathology, Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerpen, Belgium
| | - Matthis Synofzik
- Hertie Institute for Clinical Brain Research (HIH), Center of Neurology, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), University of Tübingen, Tübingen, Germany
| | - Rebecca Schüle
- Hertie Institute for Clinical Brain Research (HIH), Center of Neurology, University of Tübingen, Tübingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), University of Tübingen, Tübingen, Germany
| | - Rita Horvath
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Henry Houlden
- Department of Neuromuscular Disorders, Institute of Neurology, University College London, London, UK
| | - Luca Bartesaghi
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Hwei-Jen Lee
- Department of Biochemistry, National Defense Medical Center, Neihu, Taipei, Taiwan
| | | | - Tyler Mark Pierson
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, Los Angeles, USA
- Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, USA
- Department of Pediatrics, Cedars-Sinai Medical Center, Los Angeles, USA
- Center for the Undiagnosed Patient, Cedars-Sinai Medical Center, Los Angeles, USA
| | - Jan Senderek
- Friedrich-Baur-Institute, Department of Neurology, LMU Munich, Munich, Germany
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10
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Shaheen R, Patel N, Shamseldin H, Alzahrani F, Al-Yamany R, ALMoisheer A, Ewida N, Anazi S, Alnemer M, Elsheikh M, Alfaleh K, Alshammari M, Alhashem A, Alangari AA, Salih MA, Kircher M, Daza RM, Ibrahim N, Wakil SM, Alaqeel A, Altowaijri I, Shendure J, Al-Habib A, Faqieh E, Alkuraya FS. Accelerating matchmaking of novel dysmorphology syndromes through clinical and genomic characterization of a large cohort. Genet Med 2015; 18:686-95. [PMID: 26633546 DOI: 10.1038/gim.2015.147] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 09/03/2015] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Dysmorphology syndromes are among the most common referrals to clinical genetics specialists. Inability to match the dysmorphology pattern to a known syndrome can pose a major diagnostic challenge. With an aim to accelerate the establishment of new syndromes and their genetic etiology, we describe our experience with multiplex consanguineous families that appeared to represent novel autosomal recessive dysmorphology syndromes at the time of evaluation. METHODS Combined autozygome/exome analysis of multiplex consanguineous families with apparently novel dysmorphology syndromes. RESULTS Consistent with the apparent novelty of the phenotypes, our analysis revealed a strong candidate variant in genes that were novel at the time of the analysis in the majority of cases, and 10 of these genes are published here for the first time as novel candidates (CDK9, NEK9, ZNF668, TTC28, MBL2, CADPS, CACNA1H, HYAL2, CTU2, and C3ORF17). A significant minority of the phenotypes (6/31, 19%), however, were caused by genes known to cause Mendelian phenotypes, thus expanding the phenotypic spectrum of the diseases linked to these genes. The conspicuous inheritance pattern and the highly specific phenotypes appear to have contributed to the high yield (90%) of plausible molecular diagnoses in our study cohort. CONCLUSION Reporting detailed clinical and genomic analysis of a large series of apparently novel dysmorphology syndromes will likely lead to a trend to accelerate the establishment of novel syndromes and their underlying genes through open exchange of data for the benefit of patients, their families, health-care providers, and the research community.Genet Med 18 7, 686-695.
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Affiliation(s)
- Ranad Shaheen
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Nisha Patel
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Hanan Shamseldin
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Fatema Alzahrani
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ruah Al-Yamany
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Agaadir ALMoisheer
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Nour Ewida
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Shamsa Anazi
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Maha Alnemer
- Department of Obstetrics and Gynecology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mohamed Elsheikh
- Department of Obstetrics and Gynecology, Suliman AlHabib Hospital, Riyadh, Saudi Arabia
| | - Khaled Alfaleh
- Department of Obstetrics and Gynecology, Suliman AlHabib Hospital, Riyadh, Saudi Arabia.,Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Muneera Alshammari
- Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Amal Alhashem
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
| | - Abdullah A Alangari
- Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Mustafa A Salih
- Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Martin Kircher
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Riza M Daza
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Niema Ibrahim
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Salma M Wakil
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Ahmed Alaqeel
- Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Ikhlas Altowaijri
- Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Jay Shendure
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Amro Al-Habib
- Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Eissa Faqieh
- Department of Pediatrics, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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11
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Shamseldin H, Alazami A, Manning M, Hashem A, Caluseiu O, Tabarki B, Esplin E, Schelley S, Innes A, Parboosingh J, Lamont R, Majewski J, Bernier F, Alkuraya F, Alkuraya FS. RTTN Mutations Cause Primary Microcephaly and Primordial Dwarfism in Humans. Am J Hum Genet 2015; 97:862-8. [PMID: 26608784 DOI: 10.1016/j.ajhg.2015.10.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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: 08/09/2015] [Accepted: 10/20/2015] [Indexed: 10/22/2022] Open
Abstract
Primary microcephaly is a developmental brain anomaly that results from defective proliferation of neuroprogenitors in the germinal periventricular zone. More than a dozen genes are known to be mutated in autosomal-recessive primary microcephaly in isolation or in association with a more generalized growth deficiency (microcephalic primordial dwarfism), but the genetic heterogeneity is probably more extensive. In a research protocol involving autozygome mapping and exome sequencing, we recruited a multiplex consanguineous family who is affected by severe microcephalic primordial dwarfism and tested negative on clinical exome sequencing. Two candidate autozygous intervals were identified, and the second round of exome sequencing revealed a single intronic variant therein (c.2885+8A>G [p.Ser963(∗)] in RTTN exon 23). RT-PCR confirmed that this change creates a cryptic splice donor and thus causes retention of the intervening 7 bp of the intron and leads to premature truncation. On the basis of this finding, we reanalyzed the exome file of a second consanguineous family affected by a similar phenotype and identified another homozygous change in RTTN as the likely causal mutation. Combined linkage analysis of the two families confirmed that RTTN maps to the only significant linkage peak. Finally, through international collaboration, a Canadian multiplex family affected by microcephalic primordial dwarfism and biallelic mutation of RTTN was identified. Our results expand the phenotype of RTTN-related disorders, hitherto limited to polymicrogyria, to include microcephalic primordial dwarfism with a complex brain phenotype involving simplified gyration.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia; Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia.
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12
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Khalak HG, Wakil SM, Imtiaz F, Ramzan K, Baz B, Almostafa A, Hagos S, Alzahrani F, Abu-Dhaim N, Abu Safieh L, Al-Jbali L, Al-Hamed MS, Monies D, Aldahmesh M, Al-Dosari MS, Kaya N, Shamseldin H, Shaheen R, Al-Rashed M, Hashem M, Al-Tassan N, Meyer B, Alazami AM, Alkuraya FS. Autozygome maps dispensable DNA and reveals potential selective bias against nullizygosity. Genet Med 2012; 14:515-9. [PMID: 22241088 DOI: 10.1038/gim.2011.28] [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: 11/09/2022] Open
Abstract
PURPOSE Copy number variants are an important source of human genome diversity. The widespread distribution of hemizygous copy number variants in the DNA of healthy humans suggests that haploinsufficiency is largely tolerated. However, little is known about the extent to which corresponding nullizygosity (two-copy deletion) is similarly tolerated. METHODS We analyzed a cohort of first cousin unions to enrich for shared parental hemizygous events and tested their Mendelian inheritance in offspring. RESULTS Analysis of autozygous DNA blocks (autozygome) in the offspring not only proved an efficient method of mapping "dispensable" DNA but also revealed potential selective bias against the occurrence of nullizygous changes. This bias was not restricted to genic copy number variants and was not accounted for by a high rate of miscarriages. CONCLUSIONS The autozygome is an efficient way to map dispensable segments of DNA and may reveal selective bias against nullizygosity in healthy individuals.
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Affiliation(s)
- Hanif G Khalak
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
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13
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Abu-Safieh L, Abboud EB, Alkuraya H, Shamseldin H, Al-Enzi S, Al-Abdi L, Hashem M, Colak D, Jarallah A, Ahmad H, Bobis S, Nemer G, Bitar F, Alkuraya F. Mutation of IGFBP7 causes upregulation of BRAF/MEK/ERK pathway and familial retinal arterial macroaneurysms. Am J Hum Genet 2011; 89:313-9. [PMID: 21835307 DOI: 10.1016/j.ajhg.2011.07.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 07/11/2011] [Accepted: 07/14/2011] [Indexed: 12/27/2022] Open
Abstract
Insulin-like growth factor binding proteins (IGFBPs) play important physiological functions through the modulation of IGF signaling as well as IGF-independent mechanisms. Despite the established role of IGFs in development, a similar role for the seven known IGFBPs has not been established in humans. Here, we show that an autosomal-recessive syndrome that consists of progressive retinal arterial macroaneurysms and supravalvular pulmonic stenosis is caused by mutation of IGFBP7. Consistent with the recently established inhibitory role of IGFBP7 on BRAF signaling, the BRAF/MEK/ERK pathway is upregulated in these patients, which may explain why the cardiac phenotype overlaps with other disorders characterized by germline mutations in this pathway. The retinal phenotype appears to be mediated by a role in vascular endothelium, where IGFBP7 is highly expressed.
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14
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Al-Qattan MM, Almazyad M, Shamseldin H, Alkuraya FS. Dorsal dimelia: report of two cases with an emphasis on the variation of phenotypic expression and a search for candidate causative genes. J Hand Surg Eur Vol 2010; 35:715-20. [PMID: 20659967 DOI: 10.1177/1753193410378954] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Dorsal dimelia is a form of duplication along the dorsoventral axis of the developing limb. Previous authors reporting on this rare entity have stated that the essential feature of the deformity is the presence of double or circumferential nail at the tip of the finger and that the aetiology is probably related to a mutation of Engrailed-1 (En-1). In this paper we report on two cases to demonstrate that the deformity in humans may be fully or partially expressed, with or without the double nail deformity, respectively. We also reviewed reported cases in humans and experimental animals and searched our two cases for candidate causative genes within the En-1 pathway.
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Affiliation(s)
- M M Al-Qattan
- Department of Surgery and College of Medicine, King Saud University, Riyadh, Saudi Arabia.
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15
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Aldahmesh MA, Abu Safieh L, Alkuraya H, Al-Rajhi A, Shamseldin H, Hashem M, Alzahrani F, Khan AO, Alqahtani F, Rahbeeni Z, Alowain M, Khalak H, Al-Hazzaa S, Meyer BF, Alkuraya FS. Molecular characterization of retinitis pigmentosa in Saudi Arabia. Mol Vis 2009; 15:2464-9. [PMID: 19956407 PMCID: PMC2786884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2009] [Accepted: 11/18/2009] [Indexed: 12/02/2022] Open
Abstract
PURPOSE To catalog mutations that underlie retinitis pigmentosa (RP) in Saudi Arabia using a representative sample. METHODS Fifty-two patients with RP were recruited and their homozygosity mapping, with or without linkage analysis, was used to suggest the causative genes followed by bidirectional sequencing. RESULTS Mutations were identified in 94% of our study cohort, including seven that were novel. CONCLUSIONS Homozygosity mapping is an extremely robust approach in the study of retinitis pigmentosa in the setting of high rates of consanguinity. BBS3 mutations can rarely present as nonsyndromic RP.
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16
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Abu Safieh L, Aldahmesh MA, Shamseldin H, Hashem M, Shaheen R, Alkuraya H, Al Hazzaa SAF, Al-Rajhi A, Alkuraya FS. Clinical and molecular characterisation of Bardet-Biedl syndrome in consanguineous populations: the power of homozygosity mapping. J Med Genet 2009; 47:236-41. [PMID: 19858128 DOI: 10.1136/jmg.2009.070755] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Bardet-Biedl syndrome (BBS) is a ciliopathy with pleiotropic effect that manifests primarily as renal insufficiency, polydactyly, retinal dystrophy and obesity. The current phenotype-genotype correlation is insufficient to predict the likely causative mutation that makes sequencing of all 14 BBS genes an often necessary but highly complicated way to identify the underlying genetic defect in affected patients. In this study, homozygosity mapping is shown as a robust approach that is highly suited for genetically heterogeneous autosomal recessive disorders in populations in which consanguinity is prevalent. This approach allowed us to quickly identify seven novel mutations in seven families with BBS. Some of these mutations would have been missed by unguided routine sequencing, which suggests that missed mutations in known BBS genes could be more common than previously thought. This study, the largest to date on Saudi BBS families, also revealed interesting phenotypic aspects of BBS, including the first report of non-syndromic retinitis pigmentosa as a novel BBS phenotype.
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Affiliation(s)
- L Abu Safieh
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
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