2
|
Martin CA, Sarlós K, Logan CV, Thakur RS, Parry DA, Bizard AH, Leitch A, Cleal L, Ali NS, Al-Owain MA, Allen W, Altmüller J, Aza-Carmona M, Barakat BA, Barraza-García J, Begtrup A, Bogliolo M, Cho MT, Cruz-Rojo J, Dhahrabi HAM, Elcioglu NH, Gorman GS, Jobling R, Kesterton I, Kishita Y, Kohda M, Le Quesne Stabej P, Malallah AJ, Nürnberg P, Ohtake A, Okazaki Y, Pujol R, Ramirez MJ, Revah-Politi A, Shimura M, Stevens P, Taylor RW, Turner L, Williams H, Wilson C, Yigit G, Zahavich L, Alkuraya FS, Surralles J, Iglesias A, Murayama K, Wollnik B, Dattani M, Heath KE, Hickson ID, Jackson AP, Jackson AP. Mutations in TOP3A Cause a Bloom Syndrome-like Disorder. Am J Hum Genet 2018; 103:456. [PMID: 30193137 PMCID: PMC6128302 DOI: 10.1016/j.ajhg.2018.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
3
|
Martin CA, Sarlós K, Logan CV, Thakur RS, Parry DA, Bizard AH, Leitch A, Cleal L, Ali NS, Al-Owain MA, Allen W, Altmüller J, Aza-Carmona M, Barakat BAY, Barraza-García J, Begtrup A, Bogliolo M, Cho MT, Cruz-Rojo J, Dhahrabi HAM, Elcioglu NH, Gorman GS, Jobling R, Kesterton I, Kishita Y, Kohda M, Le Quesne Stabej P, Malallah AJ, Nürnberg P, Ohtake A, Okazaki Y, Pujol R, Ramirez MJ, Revah-Politi A, Shimura M, Stevens P, Taylor RW, Turner L, Williams H, Wilson C, Yigit G, Zahavich L, Alkuraya FS, Surralles J, Iglesias A, Murayama K, Wollnik B, Dattani M, Heath KE, Hickson ID, Jackson AP. Mutations in TOP3A Cause a Bloom Syndrome-like Disorder. Am J Hum Genet 2018; 103:221-231. [PMID: 30057030 PMCID: PMC6080766 DOI: 10.1016/j.ajhg.2018.07.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [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: 04/30/2018] [Accepted: 06/29/2018] [Indexed: 11/21/2022] Open
Abstract
Bloom syndrome, caused by biallelic mutations in BLM, is characterized by prenatal-onset growth deficiency, short stature, an erythematous photosensitive malar rash, and increased cancer predisposition. Diagnostically, a hallmark feature is the presence of increased sister chromatid exchanges (SCEs) on cytogenetic testing. Here, we describe biallelic mutations in TOP3A in ten individuals with prenatal-onset growth restriction and microcephaly. TOP3A encodes topoisomerase III alpha (TopIIIα), which binds to BLM as part of the BTRR complex, and promotes dissolution of double Holliday junctions arising during homologous recombination. We also identify a homozygous truncating variant in RMI1, which encodes another component of the BTRR complex, in two individuals with microcephalic dwarfism. The TOP3A mutations substantially reduce cellular levels of TopIIIα, and consequently subjects' cells demonstrate elevated rates of SCE. Unresolved DNA recombination and/or replication intermediates persist into mitosis, leading to chromosome segregation defects and genome instability that most likely explain the growth restriction seen in these subjects and in Bloom syndrome. Clinical features of mitochondrial dysfunction are evident in several individuals with biallelic TOP3A mutations, consistent with the recently reported additional function of TopIIIα in mitochondrial DNA decatenation. In summary, our findings establish TOP3A mutations as an additional cause of prenatal-onset short stature with increased cytogenetic SCEs and implicate the decatenation activity of the BTRR complex in their pathogenesis.
Collapse
Affiliation(s)
- Carol-Anne Martin
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Kata Sarlós
- Center for Chromosome Stability and Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - Clare V Logan
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Roshan Singh Thakur
- Center for Chromosome Stability and Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - David A Parry
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Anna H Bizard
- Center for Chromosome Stability and Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark
| | - Andrea Leitch
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Louise Cleal
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK
| | | | - Mohammed A Al-Owain
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia
| | | | - Janine Altmüller
- Cologne Center for Genomics, University of Cologne, 50931 Cologne, Germany
| | - Miriam Aza-Carmona
- Institute of Medical and Molecular Genetics and Skeletal dysplasia multidisciplinary Unit, Hospital Universitario La Paz, Universidad Autónoma de Madrid, IdiPaz, Madrid 28046, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain
| | | | - Jimena Barraza-García
- Institute of Medical and Molecular Genetics and Skeletal dysplasia multidisciplinary Unit, Hospital Universitario La Paz, Universidad Autónoma de Madrid, IdiPaz, Madrid 28046, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain
| | - Amber Begtrup
- GeneDx, 207 Perry Parkway, Gaithersburg, MD 20877, USA
| | - Massimo Bogliolo
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain; Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain
| | - Megan T Cho
- GeneDx, 207 Perry Parkway, Gaithersburg, MD 20877, USA
| | - Jaime Cruz-Rojo
- Department of Pediatric Endocrinology & Dysmorphology, Hospital 12 Octubre, Madrid 28041, Spain
| | | | - Nursel H Elcioglu
- Department of Pediatric Genetics, Marmara University Medical School, Istanbul 34722, Turkey
| | - Gráinne S Gorman
- Wellcome Centre for Mitochondrial Research, Institute of Neuroscience, School of Medical Education, Newcastle University, Newcastle upon Tyne NE2 4HH, UK
| | | | - Ian Kesterton
- Cytogenetics Department, Viapath Analytics, Guy's Hospital, London SE1 9RT, UK
| | - Yoshihito Kishita
- Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Masakazu Kohda
- Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | | | | | - Peter Nürnberg
- Cologne Center for Genomics, University of Cologne, 50931 Cologne, Germany
| | - Akira Ohtake
- Department of Pediatrics, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama, Saitama 350-0495, Japan
| | - Yasushi Okazaki
- Intractable Disease Research Center, Graduate School of Medicine, Juntendo University, 2-1-1, Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Roser Pujol
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain; Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain
| | - Maria José Ramirez
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain; Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain
| | - Anya Revah-Politi
- Institute for Genomic Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Masaru Shimura
- Center for Medical Genetics, Department of Metabolism, Chiba Children's Hospital, 579-1, Heta-cho, Midori-ku, Chiba 266-0007, Japan
| | - Paul Stevens
- Cytogenetics Department, Viapath Analytics, Guy's Hospital, London SE1 9RT, UK
| | - Robert W Taylor
- Wellcome Centre for Mitochondrial Research, Institute of Neuroscience, School of Medical Education, Newcastle University, Newcastle upon Tyne NE2 4HH, UK
| | - Lesley Turner
- Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada
| | - Hywel Williams
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | | | - Gökhan Yigit
- Institute of Human Genetics, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Laura Zahavich
- The Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia
| | - Jordi Surralles
- Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain; Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain; Department of Genetics and Biomedical Research Institute Sant Pau, Hospital de la Santa Creu i Sant Pau, Barcelona 08041, Spain
| | - Alejandro Iglesias
- Department of Pediatrics, Division of Clinical Genetics, Columbia University Medical Center, New York, NY 10032, USA
| | - Kei Murayama
- Center for Medical Genetics, Department of Metabolism, Chiba Children's Hospital, 579-1, Heta-cho, Midori-ku, Chiba 266-0007, Japan
| | - Bernd Wollnik
- Institute of Human Genetics, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Mehul Dattani
- UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - Karen E Heath
- Institute of Medical and Molecular Genetics and Skeletal dysplasia multidisciplinary Unit, Hospital Universitario La Paz, Universidad Autónoma de Madrid, IdiPaz, Madrid 28046, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras, Madrid 28029, Spain
| | - Ian D Hickson
- Center for Chromosome Stability and Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
| | - Andrew P Jackson
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XU, UK.
| |
Collapse
|
4
|
Alrakaf L, Al-Owain MA, Busehail M, Alotaibi MA, Monies D, Aldhalaan HM, Alhashem A, Al-Hassnan ZN, Rahbeeni ZA, Murshedi FA, Ani NA, Al-Maawali A, Ibrahim NA, Abdulwahab FM, Alsagob M, Hashem MO, Ramadan W, Abouelhoda M, Meyer BF, Kaya N, Maddirevula S, Alkuraya FS. Further delineation of Temtamy syndrome of corpus callosum and ocular abnormalities. Am J Med Genet A 2018; 176:715-721. [PMID: 29383837 DOI: 10.1002/ajmg.a.38615] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 08/29/2017] [Revised: 01/04/2018] [Accepted: 01/04/2018] [Indexed: 11/08/2022]
Abstract
Temtamy syndrome is a syndromic form of intellectual disability characterized by ocular involvement, epilepsy and dysgenesis of the corpus callosum. After we initially mapped the disease to C12orf57, we noted a high carrier frequency of an ancient startloss founder mutation [c.1A>G; p.M1?] in our population, and variable phenotypic expressivity in newly identified cases. This study aims to combine 33 previously published patients with 23 who are described here for the first time to further delineate the phenotype of this syndrome. In addition to the known p.M1? founder, we describe four novel homozygous variants, thus increasing the number of Temtamy syndrome-related C12orf57 variants to seven, all but one predicted to be loss of function. While all patients presented with intellectual disability/developmental delay, the frequency of other phenotypic features was variable: 73.2% (41/56) had epilepsy, 63% (34/54) had corpus callosal abnormalities, 14.5% (8/55) had coloboma, and 16.4% (9/55) had microphthalmia. Our analysis also revealed a high frequency of less recognized features such as congenital heart disease (51.4%), and brain white matter abnormalities (38%, 19/50). We conclude that C12orf57 variants should be considered in the etiology of developmental delay/intellectual disability, even when typical syndromic features are lacking, especially in those who trace their ancestry to Saudi Arabia where a founder C12orf57 mutation is among the most common recessive causes of intellectual disability.
Collapse
Affiliation(s)
- Laila Alrakaf
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Mohammed A Al-Owain
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Maryam Busehail
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Maha A Alotaibi
- Clinical Genetic and Metabolic Department, King Saud Medical city, Riyadh, Saudi Arabia
| | - Dorota Monies
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Hesham M Aldhalaan
- Department of Neuroscience, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Amal Alhashem
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
| | - Zuhair N Al-Hassnan
- Department of Medical 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
| | - Zuhair A Rahbeeni
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Fathiya Al Murshedi
- Genetic and Developmental Medicine Clinic, Sultan Qaboos University Hospital, Muscat, Oman
| | - Nadia Al Ani
- Genetic and Developmental Medicine Clinic, Sultan Qaboos University Hospital, Muscat, Oman.,Department of Genetics, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman
| | - Almundher Al-Maawali
- Genetic and Developmental Medicine Clinic, Sultan Qaboos University Hospital, Muscat, Oman.,Department of Genetics, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman
| | - Niema A Ibrahim
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Firdous M Abdulwahab
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Maysoon Alsagob
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Mais O Hashem
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Wafaa Ramadan
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Mohamed Abouelhoda
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Brian F Meyer
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Namik Kaya
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Sateesh Maddirevula
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital Research Center, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia.,Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| |
Collapse
|
6
|
Cuturilo G, Hodge JC, Runke CK, Thorland EC, Al-Owain MA, Ellison JW, Babovic-Vuksanovic D. Phenotype analysis impacts testing strategy in patients with Currarino syndrome. Clin Genet 2015; 89:109-14. [PMID: 25691298 DOI: 10.1111/cge.12572] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 02/12/2015] [Accepted: 02/12/2015] [Indexed: 12/11/2022]
Abstract
Currarino syndrome (OMIM 175450) presents with sacral, anorectal, and intraspinal anomalies and presacral meningocele or teratoma. Autosomal dominant loss-of-function mutations in the MNX1 gene cause nearly all familial and 30% of sporadic cases. Less frequently, a complex phenotype of Currarino syndrome can be caused by microdeletions of 7q containing MNX1. Here, we report one familial and three sporadic cases of Currarino syndrome. To determine the most efficient genetic testing approach for these patients, we have compared results from MNX1 sequencing, chromosomal microarray, and performed a literature search with analysis of genotype-phenotype correlation. Based on the relationship between the type of mutation (intragenic MNX1 mutations vs 7q microdeletion) and the presence of intellectual disability, growth retardation, facial dysmorphism, and associated malformations, we propose a testing algorithm. Patients with the classic Currarino triad of malformations but normal growth, intellect, and facial appearance should have MNX1 sequencing first, and only in the event of a normal result should the clinician proceed with chromosomal microarray testing. In contrast, if growth delay and/or facial dysmorphy and/or intellectual disability are present, chromosomal microarray should be the first method of choice for genetic testing.
Collapse
Affiliation(s)
- G Cuturilo
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia.,Department of Medical Genetics, University Children's Hospital, Belgrade, Serbia
| | - J C Hodge
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.,Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - C K Runke
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - E C Thorland
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - M A Al-Owain
- Department of Medical Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - J W Ellison
- Department of Genetics, Kaiser Permanente Medical Center, San Francisco, CA, USA
| | - D Babovic-Vuksanovic
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.,Department of Medical Genetics, Mayo Clinic, Rochester, MN, USA
| |
Collapse
|