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Schmetz A, Ballesta-Martínez MJ, Isidor B, Sousa AB, Wieczorek D, Bramswig NC. Adult syndromology: challenges, opportunities and perspectives: Illustrated by the description of four adults with Costello syndrome. MED GENET-BERLIN 2024; 36:95-102. [PMID: 38854651 PMCID: PMC11154183 DOI: 10.1515/medgen-2024-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Clinical geneticists and syndromologists have traditionally focused on identifying syndromes in children. However, there is a growing acknowledgment of the need to describe adult phenotypes. This article provides an overview of the evolving phenotypes of rare genetic syndromes into adulthood, elucidating its challenges, opportunities, and future perspectives. The clinical phenotypes of four adults with Costello syndrome are described to illustrate these aspects. Phenotypic and genotypic data from four individuals broaden the spectrum of Costello syndrome in adulthood and highlight the high variability in neurocognitive outcome. The clinical data align with previous findings and established genotype-phenotype correlations. Interestingly, two individuals presented with recurrent cancers (bladder cancer and neuroblastoma). Further studies are imperative to provide reliable information for counselling and management to enable comprehensive understanding of the evolving features of rare syndromic diseases and special health issues into adulthood.
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Affiliation(s)
- Ariane Schmetz
- Heinrich-Heine-University DusseldorfInstitute of Human Genetics, Medical Faculty and University Hospital DusseldorfMoorenstr. 540225DusseldorfGermany
| | | | - Bertrand Isidor
- University Hospital Nantes, University of NantesMedical Genetics Section8 Quai Moncousu44007NantesFrance
| | - Ana Berta Sousa
- Santa Maria Hospital / CHULNPediatrics Department1649-028LisboaPortugal
| | - Dagmar Wieczorek
- Heinrich-Heine-University DusseldorfInstitute of Human Genetics, Medical Faculty and University Hospital DusseldorfMoorenstr. 540225DusseldorfGermany
| | - Nuria C. Bramswig
- Heinrich-Heine-University DusseldorfInstitute of Human Genetics, Medical Faculty and University Hospital DusseldorfMoorenstr. 540225DusseldorfGermany
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2
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Bessis D, Bursztejn AC, Morice-Picard F, Capri Y, Barbarot S, Aubert H, Bodet D, Bourrat E, Chiaverini C, Poujade L, Willems M, Rouanet J, Dompmartin-Blanchère A, Geneviève D, Gerard M, Ginglinger E, Hadj-Rabia S, Martin L, Mazereeuw-Hautier J, Bibas N, Molinari N, Herman F, Phan A, Rod J, Roger H, Sigaudy S, Ziegler A, Vial Y, Verloes A, Cavé H, Lacombe D. Dermatological manifestations in Costello syndrome: A prospective multicentric study of 31 HRAS-positive variant patients. J Eur Acad Dermatol Venereol 2024. [PMID: 38595321 DOI: 10.1111/jdv.19996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 02/29/2024] [Indexed: 04/11/2024]
Abstract
BACKGROUND Data on dermatological manifestations of Costello syndrome (CS) remain heterogeneous and lack in validated description. OBJECTIVES To describe the dermatological manifestations of CS; compare them with the literature findings; assess those discriminating CS from other RASopathies, including cardiofaciocutaneous syndrome (CFCS) and the main types of Noonan syndrome (NS); and test for dermatological phenotype-genotype correlations. METHODS We performed a 10-year, large, prospective, multicentric, collaborative dermatological and genetic study. RESULTS Thirty-one patients were enrolled. Hair abnormalities were ubiquitous, including wavy or curly hair and excessive eyebrows, respectively in 68% and 56%. Acral excessive skin (AES), papillomas and keratotic papules (PKP), acanthosis nigricans (AN), palmoplantar hyperkeratosis (PPHK) and 'cobblestone' papillomatous papules of the upper lip (CPPUL), were noted respectively in 84%, 61%, 65%, 55% and 32%. Excessive eyebrows, PKP, AN, CCPUL and AES best differentiated CS from CFCS and NS. Multiple melanocytic naevi (>50) may constitute a new marker of attenuated CS associated with intragenic duplication in HRAS. Oral acitretin may be highly beneficial for therapeutic management of PPHK. No significant dermatological phenotype-genotype correlation was determined between patients with and without HRAS c.34G>A (p.G12S). CONCLUSIONS AND RELEVANCE This validated phenotypic characterization of a large number of patients with CS will allow future researchers to make a positive diagnosis, and to differentiate CS from CFCS and NS.
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Affiliation(s)
- Didier Bessis
- Department of Dermatology, Saint-Eloi Hospital, University of Montpellier, Montpellier, France
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- INSERM U1058, Montpellier, France
| | | | - Fanny Morice-Picard
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Paediatric Dermatology, Pellegrin University Hospital of Bordeaux, Bordeaux, France
| | - Yline Capri
- Department of Clinical Genetics, Robert-Debré Hospital, Paris, France
- French National Reference Centre for Developmental Anomalies and Malformative Syndromes - Ile de France, Robert-Debré Hospital, AP-HP, Paris, France
| | - Sébastien Barbarot
- Department of Dermatology, Hotel Dieu Hospital, University of Nantes, Nantes, France
| | - Hélène Aubert
- Department of Dermatology, Hotel Dieu Hospital, University of Nantes, Nantes, France
| | - Damien Bodet
- Department of Paediatric Haematology-Immunology-Oncology, Caen Normandie Hospital and University of Caen, Caen, France
| | - Emmanuelle Bourrat
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Paediatric Dermatology, Robert-Debré Hospital, AP-HP, Paris, France
| | - Christine Chiaverini
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Dermatology, l'Archet 2 Hospital, University of Nice, Nice, France
| | - Laura Poujade
- Department of Dermatology, Saint-Eloi Hospital, University of Montpellier, Montpellier, France
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
| | - Marjolaine Willems
- Department of Clinical Genetics, Arnaud de Villeneuve Hospital, University of Montpellier, Montpellier, France
- French National Reference Centre for Developmental Anomalies - and Malformative Syndromes Sud Ouest Occitanie, University hospital of Montpellier, Montpellier, France
| | - Jacques Rouanet
- Department of Dermatology, d'Estaing Hospital and University Hospital of Clermont-Ferrand, Clermont-Ferrand, France
| | | | - David Geneviève
- Department of Clinical Genetics, Arnaud de Villeneuve Hospital, University of Montpellier, Montpellier, France
- French National Reference Centre for Developmental Anomalies - and Malformative Syndromes Sud Ouest Occitanie, University hospital of Montpellier, Montpellier, France
| | - Marion Gerard
- Department of Clinical Genetics, Caen Normandie Hospital and University of Caen, Caen, France
| | | | - Smaïl Hadj-Rabia
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Paediatric Dermatology, Necker-Enfants Malades Hospital, AP-HP, Paris, France
| | - Ludovic Martin
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Dermatology, Angers Hospital University, Angers, France
| | - Juliette Mazereeuw-Hautier
- French National Reference Centre for Rare Diseases of the Skin and Mucous Membranes of Genetic Origin (MAGEC), University hospital of Montpellier, Montpellier, France
- Department of Dermatology, Larrey Hospital, University of Toulouse, Toulouse, France
| | - Nathalie Bibas
- Department of Dermatology, Larrey Hospital, University of Toulouse, Toulouse, France
| | - Nicolas Molinari
- Department of Statistics, La Colombière Hospital and University of Montpellier, Montpellier, France
| | - Fanchon Herman
- Department of Statistics, La Colombière Hospital and University of Montpellier, Montpellier, France
| | - Alice Phan
- Department of Paediatric Dermatology, Femme-Mère-Enfant Hospital-HCL, University of Lyon, Lyon, France
| | - Julien Rod
- Department of Paediatric Surgery, Caen Normandie Hospital and University of Caen, Caen, France
| | | | - Sabine Sigaudy
- French National Reference Centre for Developmental Anomalies and Malformative Syndromes - Ile de France, Robert-Debré Hospital, AP-HP, Paris, France
- Department of Clinical Genetics, La Timone Hospital, AP-HM and University of Marseille, Marseille, France
| | - Alban Ziegler
- Department of Clinical Genetics, Hospital and University of Angers, Angers, France
| | - Yoann Vial
- French National Reference Centre for Developmental Anomalies and Malformative Syndromes - Ile de France, Robert-Debré Hospital, AP-HP, Paris, France
- Department of Molecular Genetics, Robert-Debré Hospital, AP-HP, Paris, France
| | - Alain Verloes
- Department of Clinical Genetics, Robert-Debré Hospital, Paris, France
- French National Reference Centre for Developmental Anomalies and Malformative Syndromes - Ile de France, Robert-Debré Hospital, AP-HP, Paris, France
| | - Hélène Cavé
- French National Reference Centre for Developmental Anomalies and Malformative Syndromes - Ile de France, Robert-Debré Hospital, AP-HP, Paris, France
- Department of Molecular Genetics, Robert-Debré Hospital, AP-HP, Paris, France
| | - Didier Lacombe
- Department of Clinical Genetics, Pellegrin University Hospital of Bordeaux, Bordeaux, France
- French National Reference Centre for Developmental Anomalies - and Malformative Syndromes SOOR, University Hospital of Bordeaux, Bordeaux, France
- INSERM U1211, Bordeaux, France
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3
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Frey T, Ivanovski I, Bahr A, Zweier M, Laube J, Luchsinger I, Steindl K, Rauch A. A very mild phenotype in six individuals of a three-generation family with the novel HRAS variant c.176C > G p.(Ala59Gly): Emergence of a new HRAS-related RASopathy distinct from Costello syndrome. Am J Med Genet A 2023; 191:2074-2082. [PMID: 37194190 DOI: 10.1002/ajmg.a.63240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/26/2023] [Accepted: 04/29/2023] [Indexed: 05/18/2023]
Abstract
Costello syndrome is a clinically recognizable, severe neurodevelopmental disorder caused by heterozygous activating variants in HRAS. The vast majority of affected patients share recurring variants affecting HRAS codons 12 and 13 and a relatively uniform phenotype. Here, we report the unique and attenuated phenotype of six individuals of an extended family affected by the HRAS variant c.176C>T p.(Ala59Gly), which, to our knowledge, has never been reported as a germline variant in patients so far. HRAS Alanine 59 has been previously functionally investigated as an oncogenic hotspot and the p.Ala59Gly substitution was shown to impair intrinsic GTP hydrolysis. All six individuals we report share a phenotype of ectodermal anomalies and mild features suggestive of a RASopathy, reminiscent of patients with Noonan syndrome-like disorder with loose anagen hair. All six are of normal intelligence, none have a history of failure to thrive or malignancy, and they have no known cardiac or neurologic pathologies. Our report adds to the previous reports of patients with rare variants affecting amino acids located in the SWITCH II/G3 region of HRAS and suggests a consistent, attenuated phenotype distinct from classical Costello syndrome. We propose the definition of a new distinct HRAS-related RASopathy for patients carrying HRAS variants affecting codons 58, 59, 60.
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Affiliation(s)
- Tanja Frey
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Ivan Ivanovski
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Angela Bahr
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Markus Zweier
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Julia Laube
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Isabelle Luchsinger
- Department of Dermatology, Pediatric Skin Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Katharina Steindl
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
| | - Anita Rauch
- Institute of Medical Genetics, University of Zurich, Zurich, Switzerland
- University Children's Hospital Zurich, Zurich, Switzerland
- University of Zurich Research Priority Program ITINERARE: Innovative Therapies in Rare Diseases, Zurich, Switzerland
- University of Zurich Research Priority Program AdaBD: Adaptive Brain Circuits in Development and Learning, Zurich, Switzerland
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4
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Zenker M. Clinical overview on RASopathies. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2022; 190:414-424. [PMID: 36428239 DOI: 10.1002/ajmg.c.32015] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/06/2022] [Accepted: 11/11/2022] [Indexed: 11/28/2022]
Abstract
RASopathies comprise a group of clinically overlapping developmental disorders caused by genetic variations affecting components or modulators of the RAS-MAPK signaling cascade, which lead to dysregulation of signal flow through this pathway. Noonan syndrome and the less frequent, clinically related disorders, Costello syndrome, cardiofaciocutaneous syndrome, Noonan syndrome with multiple lentigines, and Noonan syndrome-like disorder with loose anagen hair are part of the RASopathy spectrum and share a recognizable pattern of multisystem involvement. This review describes the "Noonan syndrome-like" phenotype as a common phenotypic signature of generalized developmental RAS pathway dysregulation. Distinctive features of the different entities are revisited against the background of the understanding of underlying genetic alterations and genotype correlations, which has evolved rapidly during the past 20 years, thereby leading to suggestions regarding the nosology of RASopathies.
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Affiliation(s)
- Martin Zenker
- Institute of Human Genetics, University Hospital Magdeburg, Medical Faculty, Otto-von-Guericke University, Magdeburg, Germany
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5
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Ney G, Gross A, Livinski A, Kratz CP, Stewart DR. Cancer incidence and surveillance strategies in individuals with RASopathies. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2022; 190:530-540. [PMID: 36533693 PMCID: PMC9825668 DOI: 10.1002/ajmg.c.32018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/15/2022] [Accepted: 11/20/2022] [Indexed: 12/24/2022]
Abstract
RASopathies are a set of clinical syndromes that have molecular and clinical overlap. Genetically, these syndromes are defined by germline pathogenic variants in RAS/MAPK pathway genes resulting in activation of this pathway. Clinically, their common molecular signature leads to comparable phenotypes, including cardiac anomalies, neurologic disorders and notably, elevated cancer risk. Cancer risk in individuals with RASopathies has been estimated from retrospective reviews and cohort studies. For example, in Costello syndrome, cancer incidence is significantly elevated over the general population, largely due to solid tumors. In some forms of Noonan syndrome, cancer risk is also elevated over the general population and is enriched for hematologic malignancies. Thus, cancer surveillance guidelines have been developed to monitor for the occurrence of such cancers in individuals with some RASopathies. These include abdominal ultrasound and urinalyses for individuals with Costello syndrome, while complete blood counts and splenic examination are recommended in Noonan syndrome. Improved cancer risk estimates and refinement of surveillance recommendations will improve the care of individuals with RASopathies.
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Affiliation(s)
- Gina Ney
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Rockville, Maryland, USA
| | - Andrea Gross
- Pediatric Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland, USA
| | - Alicia Livinski
- National Institutes of Health Library, National Institutes of Health, Bethesda, Maryland, USA
| | - Christian P Kratz
- Department of Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany
| | - Douglas R Stewart
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Rockville, Maryland, USA
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6
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Lindsey-Temple S, Edwards M, Rickassel V, Nauth T, Rosenberger G. A novel HRAS c.466C>T p.(Phe156Leu) variant in two patients with attenuated features of Costello syndrome. Eur J Hum Genet 2022; 30:1088-1093. [PMID: 35764878 PMCID: PMC9437031 DOI: 10.1038/s41431-022-01139-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/19/2022] [Accepted: 06/13/2022] [Indexed: 12/29/2022] Open
Abstract
Costello syndrome (CS) is caused by heterozygous HRAS germline mutations. Most patients share the HRAS variant p.Gly12Ser that is associated with a typical, homogeneous phenotype. Rarer pathogenic HRAS variants (e.g., p.Thr56Ile) were identified in individuals with attenuated CS phenotypes. The obvious phenotypical variability reflects different dysfunctional consequences of distinct HRAS variants. We report on two boys with the novel de novo HRAS variant c.466 C > T p.(Phe156Leu). Both had severe feeding difficulties, airway obstruction and developmental delay, which are typical findings in CS. They showed subtle facial and dermatologic features consistent with attenuated CS. They significantly differed in their musculoskeletal, cardiovascular and endocrinologic manifestations underscoring the clinical variability of individuals with identical, in particular rarer pathogenic HRAS variants. Functional studies revealed enhanced effector-binding, increased downstream signaling activation and impaired growth factor-induced signaling dynamics in cells expressing HRASPhe156Leu. Our data further illustrate the molecular and phenotypic variability of CS.
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Affiliation(s)
- Suzanna Lindsey-Temple
- Department of Clinical Genetics, Liverpool Hospital, Sydney, NSW, Australia.,School of Women's and Children's Health, Faculty of Medicine and Health, UNSW, Sydney, NSW, Australia
| | - Matt Edwards
- Paediatrics, School of Medicine, Western Sydney University, Hunter Genetics, Newcastle, NSW, Australia
| | - Verena Rickassel
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Theresa Nauth
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Georg Rosenberger
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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7
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Leoni C, Viscogliosi G, Tartaglia M, Aoki Y, Zampino G. Multidisciplinary Management of Costello Syndrome: Current Perspectives. J Multidiscip Healthc 2022; 15:1277-1296. [PMID: 35677617 PMCID: PMC9169840 DOI: 10.2147/jmdh.s291757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 05/10/2022] [Indexed: 01/09/2023] Open
Abstract
Costello syndrome (CS) is a rare neurodevelopmental disorder caused by germline mutations in HRAS. It belongs among the RASopathies, a group of syndromes characterized by alterations in components of the RAS/MAPK signaling pathway and sharing overlapping phenotypes. Its typical features include a distinctive facial appearance, growth delay, intellectual disability, ectodermal, cardiac, and musculoskeletal abnormalities, and cancer predisposition. Due to the several comorbidities having a strong impact on the quality of life, a multidisciplinary team is essential in the management of such a condition from infancy to adult age, to promptly address any detected issue and to develop appropriate personalized follow-up protocols and treatment strategies. With the present paper we aim to highlight the core and ancillary medical disciplines involved in managing the health challenges characterizing CS from pediatric to adult age, according to literature and to our large clinical experience.
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Affiliation(s)
- Chiara Leoni
- Center for Rare Diseases and Birth Defects, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario “A. Gemelli” IRCCS, Rome, Italy
- Correspondence: Chiara Leoni, Center for Rare Diseases and Birth Defects, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario “A. Gemelli” IRCCS, Largo Gemelli 8, Rome, IT-00168, Italy, Tel +39-063381344, Fax +39-063383211, Email
| | - Germana Viscogliosi
- Center for Rare Diseases and Birth Defects, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario “A. Gemelli” IRCCS, Rome, Italy
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome, Italy
| | - Yoko Aoki
- Department of Medical Genetics, Tohoku University School of Medicine, Sendai, Japan
| | - Giuseppe Zampino
- Center for Rare Diseases and Birth Defects, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario “A. Gemelli” IRCCS, Rome, Italy
- Università Cattolica del Sacro Cuore, Rome, Italy
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8
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Ríos-González BE, Rodríguez-Ortiz JF, Castro-Martínez AG, Magaña-Torres MT, Barros-Núñez P. Clinical and molecular characterization of Costello syndrome in unrelated Mexican patients. Clin Dysmorphol 2022; 31:55-58. [PMID: 34845155 DOI: 10.1097/mcd.0000000000000405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study intends to describe for the first time a cohort of Mexican patients with Costello syndrome. The five exons of the HRAS gene were amplified in DNA samples from 13 patients with a clinical suspicion of Costello syndrome. PCR products were sequenced using the Ready Reaction Big Dye Terminator v.3.0 Kit and an ABI PRISM 310 sequencer. Only five patients (38%) showed causal variant in codon 12 of the HRAS gene (four with the p.Gly12Ser and one with the p.Gly12Ala variant). Three patients showed silent polymorphic variants (p.His27His and p.Leu159Leu). Clinical features in patients carrying the causal variant were variable. The alternative diagnosis of cardio-facio-cutaneous syndrome was considered in patients who did not have a causative variant in HRAS.
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Affiliation(s)
| | | | - Anna G Castro-Martínez
- Genetic Department, Institute of Biological Sciences, Universidad Autónoma de Guadalajara
| | | | - Patricio Barros-Núñez
- Western Biomedical Research Center, IMSS
- Research Unit, Follow-up Metabolic Diseases, Pediatric UMAE, IMSS, Guadalajara, Mexico
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9
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Trakadis Y, Accogli A, Qi B, Bloom D, Joober R, Levy E, Tabbane K. Next-generation gene panel testing in adolescents and adults in a medical neuropsychiatric genetics clinic. Neurogenetics 2021; 22:313-322. [PMID: 34363551 DOI: 10.1007/s10048-021-00664-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/21/2021] [Indexed: 01/04/2023]
Abstract
Intellectual disability (ID) encompasses a clinically and genetically heterogeneous group of neurodevelopmental disorders that may present with psychiatric illness in up to 40% of cases. Despite the evidence for clinical utility of genetic panels in pediatrics, there are no published studies in adolescents/adults with ID or autism spectrum disorder (ASD). This study was approved by our institutional research ethics board. We retrospectively reviewed the medical charts of all patients evaluated between January 2017 and December 2019 in our adult neuropsychiatric genetics clinic at the McGill University Health Centre (MUHC), who had undergone a comprehensive ID/ASD gene panel. Thirty-four patients aged > 16 years, affected by ID/ASD and/or other neuropsychiatric/behavioral disorders, were identified. Pathogenic or likely pathogenic variants were identified in one-third of our cohort (32%): 8 single-nucleotide variants in 8 genes (CASK, SHANK3, IQSEC2, CHD2, ZBTB20, TREX1, SON, and TUBB2A) and 3 copy number variants (17p13.3, 16p13.12p13.11, and 9p24.3p24.1). The presence of psychiatric/behavioral disorders, regardless of the co-occurrence of ID, and, at a borderline level, the presence of ID alone were associated with positive genetic findings (p = 0.024 and p = 0.054, respectively). Moreover, seizures were associated with positive genetic results (p = 0.024). One-third of individuals presenting with psychiatric illness who met our red flags for Mendelian diseases have pathogenic or likely pathogenic variants which can be identified using a comprehensive ID/ASD gene panel (~ 2500 genes) performed on an exome backbone.
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Affiliation(s)
- Y Trakadis
- Division of Medical Genetics, Department of Specialized Medicine, Montreal Children's Hospital, McGill University Health Centre (MUHC), Room A04.3140, 1001 Boul. Décarie, Montreal, QC, H4A 3J1, Canada. .,Department of Human Genetics, McGill University, Montreal, QC, Canada. .,Douglas Mental Health Institute/Hospital, Montreal, Canada. .,Department of Psychiatry, McGill University, Montreal, Canada.
| | - A Accogli
- Division of Medical Genetics, Department of Specialized Medicine, Montreal Children's Hospital, McGill University Health Centre (MUHC), Room A04.3140, 1001 Boul. Décarie, Montreal, QC, H4A 3J1, Canada
| | - B Qi
- Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - D Bloom
- Douglas Mental Health Institute/Hospital, Montreal, Canada.,Department of Psychiatry, McGill University, Montreal, Canada
| | - R Joober
- Department of Human Genetics, McGill University, Montreal, QC, Canada.,Douglas Mental Health Institute/Hospital, Montreal, Canada.,Department of Psychiatry, McGill University, Montreal, Canada
| | - E Levy
- Douglas Mental Health Institute/Hospital, Montreal, Canada.,Department of Psychiatry, McGill University, Montreal, Canada
| | - K Tabbane
- Douglas Mental Health Institute/Hospital, Montreal, Canada.,Department of Psychiatry, McGill University, Montreal, Canada
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10
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The novel duplication HRAS c.186_206dup p.(Glu62_Arg68dup): clinical and functional aspects. Eur J Hum Genet 2020; 28:1548-1554. [PMID: 32499600 DOI: 10.1038/s41431-020-0662-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 05/07/2020] [Accepted: 05/19/2020] [Indexed: 11/08/2022] Open
Abstract
Specific activating missense HRAS variants cause Costello syndrome (CS), a RASopathy with recognizable facial features. The majority of these dominant disease causing variants affect the glycine residues in position 12 or 13. A clinically suspected CS diagnosis can be confirmed through identification of a dominant pathogenic HRAS variant. A novel HRAS variant predicting p.(Glu62_Arg68dup) was identified in an individual with hypertrophic cardiomyopathy, Chiari 1 malformation and ectodermal findings consistent with a RASopathy. Functional studies showed that the p.Glu62_Arg68dup alteration affects HRAS interaction with effector protein PIK3CA (catalytic subunit of phosphoinositide 3-kinase) and the regulator neurofibromin 1 (NF1) GTPase-activating protein (GAP). HRASGlu62_Arg68dup binding with effectors rapidly accelerated fibrosarcoma (RAF1), RAL guanine nucleotide dissociation stimulator (RALGDS) and phospholipase C1 (PLCE1) was enhanced. Accordingly, p.Glu62_Arg68dup increased steady-state phosphorylation of MEK1/2 and ERK1/2 downstream of RAF1, whereas AKT phosphorylation downstream of PI3K was not significantly affected. Growth factor stimulation revealed that expression of HRASGlu62_Arg68dup abolished the HRAS' capacity to modulate downstream signaling. Our data underscore that different qualities of dysregulated HRAS-dependent signaling dynamics determine the clinical severity in CS.
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11
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Gripp KW, Morse LA, Axelrad M, Chatfield KC, Chidekel A, Dobyns W, Doyle D, Kerr B, Lin AE, Schwartz DD, Sibbles BJ, Siegel D, Shankar SP, Stevenson DA, Thacker MM, Weaver KN, White SM, Rauen KA. Costello syndrome: Clinical phenotype, genotype, and management guidelines. Am J Med Genet A 2019; 179:1725-1744. [PMID: 31222966 DOI: 10.1002/ajmg.a.61270] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/22/2019] [Accepted: 06/01/2019] [Indexed: 12/16/2022]
Abstract
Costello syndrome (CS) is a RASopathy caused by activating germline mutations in HRAS. Due to ubiquitous HRAS gene expression, CS affects multiple organ systems and individuals are predisposed to cancer. Individuals with CS may have distinctive craniofacial features, cardiac anomalies, growth and developmental delays, as well as dermatological, orthopedic, ocular, and neurological issues; however, considerable overlap with other RASopathies exists. Medical evaluation requires an understanding of the multifaceted phenotype. Subspecialists may have limited experience in caring for these individuals because of the rarity of CS. Furthermore, the phenotypic presentation may vary with the underlying genotype. These guidelines were developed by an interdisciplinary team of experts in order to encourage timely health care practices and provide medical management guidelines for the primary and specialty care provider, as well as for the families and affected individuals across their lifespan. These guidelines are based on expert opinion and do not represent evidence-based guidelines due to the lack of data for this rare condition.
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Affiliation(s)
- Karen W Gripp
- Division of Medical Genetics, Department of Pediatrics, A.I. duPont Hospital for Children, Wilmington, Delaware
| | | | - Marni Axelrad
- Psychology Section, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Kathryn C Chatfield
- Section of Cardiology, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
| | - Aaron Chidekel
- Division of Pulmonology, Department of Pediatrics, A.I. duPont Hospital for Children, Wilmington, Delaware
| | - William Dobyns
- Division of Medical Genetics, Seattle Children's Hospital, Seattle, Washington
| | - Daniel Doyle
- Division of Endocrinology, A.I. duPont Hospital for Children, Wilmington, Delaware
| | - Bronwyn Kerr
- Manchester Center for Genomic Medicine, University of Manchester, Manchester, UK
| | - Angela E Lin
- Medical Genetics Unit, Department of Pediatrics, MassGeneral Hospital for Children, Boston, Massachusetts
| | - David D Schwartz
- Psychology Section, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Barbara J Sibbles
- Division of Pediatrics, Erasmus MC-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - Dawn Siegel
- Department of Dermatology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Suma P Shankar
- Division of Genomic Medicine, Department of Pediatrics, University of California Davis, Sacramento, California
| | - David A Stevenson
- Division of Medical Genetic, Department of Pediatrics, Stanford University, Palo Alto, California
| | - Mihir M Thacker
- Department of Orthopedic Surgery, Nemoirs-Alfred I. duPont Hospital for Children, Wilmington, Delaware
| | - K Nicole Weaver
- Division of Human Genetics, University of Cincinnati College of Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Sue M White
- Victorian Clinical Genetics Services, Royal Children's Hospital, Victoria, Australia
| | - Katherine A Rauen
- Division of Genomic Medicine, Department of Pediatrics, University of California Davis, Sacramento, California
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12
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Capri Y, Flex E, Krumbach OH, Carpentieri G, Cecchetti S, Lißewski C, Rezaei Adariani S, Schanze D, Brinkmann J, Piard J, Pantaleoni F, Lepri FR, Goh ESY, Chong K, Stieglitz E, Meyer J, Kuechler A, Bramswig NC, Sacharow S, Strullu M, Vial Y, Vignal C, Kensah G, Cuturilo G, Kazemein Jasemi NS, Dvorsky R, Monaghan KG, Vincent LM, Cavé H, Verloes A, Ahmadian MR, Tartaglia M, Zenker M. Activating Mutations of RRAS2 Are a Rare Cause of Noonan Syndrome. Am J Hum Genet 2019; 104:1223-1232. [PMID: 31130282 DOI: 10.1016/j.ajhg.2019.04.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 04/18/2019] [Indexed: 01/18/2023] Open
Abstract
Aberrant signaling through pathways controlling cell response to extracellular stimuli constitutes a central theme in disorders affecting development. Signaling through RAS and the MAPK cascade controls a variety of cell decisions in response to cytokines, hormones, and growth factors, and its upregulation causes Noonan syndrome (NS), a developmental disorder whose major features include a distinctive facies, a wide spectrum of cardiac defects, short stature, variable cognitive impairment, and predisposition to malignancies. NS is genetically heterogeneous, and mutations in more than ten genes have been reported to underlie this disorder. Despite the large number of genes implicated, about 10%-20% of affected individuals with a clinical diagnosis of NS do not have mutations in known RASopathy-associated genes, indicating that additional unidentified genes contribute to the disease, when mutated. By using a mixed strategy of functional candidacy and exome sequencing, we identify RRAS2 as a gene implicated in NS in six unrelated subjects/families. We show that the NS-causing RRAS2 variants affect highly conserved residues localized around the nucleotide binding pocket of the GTPase and are predicted to variably affect diverse aspects of RRAS2 biochemical behavior, including nucleotide binding, GTP hydrolysis, and interaction with effectors. Additionally, all pathogenic variants increase activation of the MAPK cascade and variably impact cell morphology and cytoskeletal rearrangement. Finally, we provide a characterization of the clinical phenotype associated with RRAS2 mutations.
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13
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Yu KPT, Luk HM, Leung GKC, Mak CCY, Cheng SSW, Hau EWL, Chan DKH, Lam STS, Tong TMF, Chung BHY, Lo IFM. Genetic landscape of RASopathies in Chinese: Three decades' experience in Hong Kong. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2019; 181:208-217. [PMID: 30896080 DOI: 10.1002/ajmg.c.31692] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 01/29/2019] [Accepted: 02/20/2019] [Indexed: 12/31/2022]
Abstract
RASopathies are a group of genetic disorders due to dysregulation of the RAS-MAPK signaling pathway, which is important in regulating cell growth, proliferation, and differentiation. These include Noonan syndrome (NS), Noonan syndrome with multiple lentigines (NSML), cardiofaciocutaneous (CFC) syndrome, and Costello syndrome (CS), clinical manifestations include growth retardation, developmental delay, cardiac defects, and specific dysmorphic features. There were abundant publications describing the genotype and phenotype from the Western populations. However, detailed study of RASopathies in Chinese population is lacking. We present here the largest cohort of RASopathies ever reported in Chinese populations, detailing the mutation spectrum and clinical phenotypes of these patients. The Clinical Genetic Service, Department of Health, and Queen Mary Hospital are tertiary referral centers for genetic disorders in Hong Kong. We retrospectively reviewed all the genetically confirmed cases of RASopathies, including NS, NSML, CFC syndrome, and CS, over the past 29 years (from 1989 to 2017). Analyses of the mutation spectrum and clinical phenotypes were performed. One hundred and ninety-one ethnic Chinese patients with genetically confirmed RASopathies were identified, including 148 patients with NS, 23 NSML, 12 CFC syndrome, and eight CS. We found a lower incidence of hypertrophic cardiomyopathy in individuals with NSML (27.3%), and NS caused by RAF1 mutations (62.5%). Another significant finding was for those NS patients with myeloproliferative disorder, the mutations fall within Exon 3 of PTPN11 but not only restricted to the well-known hotspots, that is, p.Asp61 and p.Thr731, which suggested that re-evaluation of the current tumor surveillance recommendation maybe warranted.
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Affiliation(s)
- Kris P T Yu
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - Ho-Ming Luk
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - Gordon K C Leung
- Department of Paediatrics and Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong, HKSAR, Hong Kong
| | - Christopher C Y Mak
- Department of Paediatrics and Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong, HKSAR, Hong Kong
| | | | - Edgar W L Hau
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - David K H Chan
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - Stephen T S Lam
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - Tony M F Tong
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
| | - Brian H Y Chung
- Department of Paediatrics and Adolescent Medicine, LKS Faculty of Medicine, The University of Hong Kong, HKSAR, Hong Kong
| | - Ivan F M Lo
- Department of Health, Clinical Genetic Service, HKSAR, Hong Kong
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14
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SHOC2-MRAS-PP1 complex positively regulates RAF activity and contributes to Noonan syndrome pathogenesis. Proc Natl Acad Sci U S A 2018; 115:E10576-E10585. [PMID: 30348783 DOI: 10.1073/pnas.1720352115] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Dephosphorylation of the inhibitory "S259" site on RAF kinases (S259 on CRAF, S365 on BRAF) plays a key role in RAF activation. The MRAS GTPase, a close relative of RAS oncoproteins, interacts with SHOC2 and protein phosphatase 1 (PP1) to form a heterotrimeric holoenzyme that dephosphorylates this S259 RAF site. MRAS and SHOC2 function as PP1 regulatory subunits providing the complex with striking specificity against RAF. MRAS also functions as a targeting subunit as membrane localization is required for efficient RAF dephosphorylation and ERK pathway regulation in cells. SHOC2's predicted structure shows remarkable similarities to the A subunit of PP2A, suggesting a case of convergent structural evolution with the PP2A heterotrimer. We have identified multiple regions in SHOC2 involved in complex formation as well as residues in MRAS switch I and the interswitch region that help account for MRAS's unique effector specificity for SHOC2-PP1. MRAS, SHOC2, and PPP1CB are mutated in Noonan syndrome, and we show that syndromic mutations invariably promote complex formation with each other, but not necessarily with other interactors. Thus, Noonan syndrome in individuals with SHOC2, MRAS, or PPPC1B mutations is likely driven at the biochemical level by enhanced ternary complex formation and highlights the crucial role of this phosphatase holoenzyme in RAF S259 dephosphorylation, ERK pathway dynamics, and normal human development.
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15
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Pantaleoni F, Lev D, Cirstea IC, Motta M, Lepri FR, Bottero L, Cecchetti S, Linger I, Paolacci S, Flex E, Novelli A, Carè A, Ahmadian MR, Stellacci E, Tartaglia M. Aberrant HRAS transcript processing underlies a distinctive phenotype within the RASopathy clinical spectrum. Hum Mutat 2017; 38:798-804. [PMID: 28390077 DOI: 10.1002/humu.23224] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Revised: 03/29/2017] [Accepted: 04/01/2017] [Indexed: 01/17/2023]
Abstract
RASopathies are a group of rare, clinically related conditions affecting development and growth, and are caused by germline mutations in genes encoding signal transducers and modulators with a role in the RAS signaling network. These disorders share facial dysmorphia, short stature, variable cognitive deficits, skeletal and cardiac defects, and a variable predisposition to malignancies. Here, we report on a de novo 10-nucleotide-long deletion in HRAS (c.481_490delGGGACCCTCT, NM_176795.4; p.Leu163ProfsTer52, NP_789765.1) affecting transcript processing as a novel event underlying a RASopathy characterized by developmental delay, intellectual disability and autistic features, distinctive coarse facies, reduced growth, and ectodermal anomalies. Molecular and biochemical studies demonstrated that the deletion promotes constitutive retention of exon IDX, which is generally skipped during HRAS transcript processing, and results in a stable and mildly hyperactive GDP/GTP-bound protein that is constitutively targeted to the plasma membrane. Our findings document a new mechanism leading to altered HRAS function that underlies a previously unappreciated phenotype within the RASopathy spectrum.
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Affiliation(s)
- Francesca Pantaleoni
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy
| | - Dorit Lev
- The Metabolic Neurogenetic Service, Wolfson Medical Center, Holon, Israel.,Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel
| | - Ion C Cirstea
- Institut für Biochemie und Molekularbiologie II, Medizinische Fakultät der Heinrich-Heine Universität, Dusseldorf, Germany.,Institute of Comparative Molecular Endocrinology, Ulm University, Ulm, Germany
| | - Marialetizia Motta
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy
| | - Francesca Romana Lepri
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy
| | - Lisabianca Bottero
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Serena Cecchetti
- Dipartimento di Biologia Cellulare e Neuroscienze, Istituto Superiore di Sanità, Rome, Italy
| | - Ilan Linger
- The Metabolic Neurogenetic Service, Wolfson Medical Center, Holon, Israel.,Sackler School of Medicine, Tel Aviv University, Ramat Aviv, Israel
| | - Stefano Paolacci
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Elisabetta Flex
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Antonio Novelli
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy
| | - Alessandra Carè
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Mohammad R Ahmadian
- Institut für Biochemie und Molekularbiologie II, Medizinische Fakultät der Heinrich-Heine Universität, Dusseldorf, Germany
| | - Emilia Stellacci
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, Rome, Italy
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16
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Bertola D, Buscarilli M, Stabley DL, Baker L, Doyle D, Bartholomew DW, Sol-Church K, Gripp KW. Phenotypic spectrum of Costello syndrome individuals harboring the rare HRAS mutation p.Gly13Asp. Am J Med Genet A 2017; 173:1309-1318. [PMID: 28371260 DOI: 10.1002/ajmg.a.38178] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 12/12/2016] [Accepted: 01/18/2017] [Indexed: 12/19/2022]
Abstract
Costello syndrome is part of the RASopathies, a group of neurocardiofaciocutaneous syndromes caused by deregulation of the RAS mitogen-activated protein kinase pathway. Heterozygous mutations in HRAS are responsible for Costello syndrome, with more than 80% of the patients harboring the specific p.Gly12Ser variant. These individuals show a homogeneous phenotype. The clinical characteristics of the Costello syndrome individuals harboring rarer HRAS mutations are less understood, due to the small number of reported cases. Here, we describe the phenotypic spectrum of five additional individuals with HRAS c.38G>A; p.Gly13Asp, including one with somatic mosaicism, and review five previously described cases. The facial and hair abnormalities of the HRAS p.Gly13Asp individuals differ from the typical pattern observed in those showing the common HRAS (p.Gly12Ser) mutation, with less coarse facial features and slow growing, sparse hair with abnormal texture, the latter resembling the pattern observed in Noonan syndrome-like disorder with loose anagen hair and individuals harboring another amino acid substitution in HRAS (p.Gly13Cys). Although some individuals with HRAS p.Gly13Asp developed papillomata and vascular proliferation lesions, no malignant tumors occurred, similar to what was reported for individuals harboring the HRAS p.Gly13Cys. The fact that no malignant tumors were described in these individuals does not allow definitive conclusions about the risk for cancer development. It remains to be determined if substitutions of amino acid 13 in HRAS (p.Gly13Asp and p.Gly13Cys) increase the risk of tumor development.
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Affiliation(s)
- Débora Bertola
- Unidade de Genética Clínica, Instituto da Criança do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil.,Instituto de Biociências da Universidade de São Paulo, São Paulo, Brazil
| | - Michelle Buscarilli
- Unidade de Genética Clínica, Instituto da Criança do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Deborah L Stabley
- Center for Applied Clinical Genomics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
| | - Laura Baker
- Division of Medical Genetics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
| | - Daniel Doyle
- Division of Endocrinology, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
| | - Dennis W Bartholomew
- Division of Molecular and Human Genetics, Nationwide Children's Hospital, Columbus, Ohio
| | - Katia Sol-Church
- Center for Applied Clinical Genomics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
| | - Karen W Gripp
- Center for Applied Clinical Genomics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware.,Division of Medical Genetics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
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17
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Gripp KW, Kolbe V, Brandenstein LI, Rosenberger G. Attenuated phenotype of Costello syndrome and early death in a patient with an HRAS mutation (c.179G>T; p.Gly60Val) affecting signalling dynamics. Clin Genet 2017; 92:332-337. [PMID: 28139825 DOI: 10.1111/cge.12980] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/03/2017] [Accepted: 01/25/2017] [Indexed: 11/27/2022]
Abstract
Costello syndrome (CS) is caused by heterozygous germline HRAS mutations. Most patients share the HRAS mutation c.34G>A (p.Gly12Ser) associated with the typical, relatively homogeneous phenotype. Rarer mutations occurred in individuals with an attenuated phenotype. Although many disease-associated HRAS alterations trigger constitutive activation of HRAS-dependent signalling pathways, additional pathological consequences exist. An infant with failure-to-thrive and hypertrophic cardiomyopathy had a novel de novo HRAS mutation (c.179G>T; p.Gly60Val). He showed subtle dysmorphic findings consistent with attenuated CS and died from presumed cardiac cause. Functional studies revealed that amino acid change p.Gly60Val impairs HRAS binding to effectors PIK3CA, phospholipase C1, and RAL guanine nucleotide dissociation stimulator. In contrast, interaction with effector rapidly accelerated fibrosarcoma (RAF) and regulator NF1 GTPase-activating protein was enhanced. Importantly, expression of HRAS p.Gly60Val in HEK293 cells reduced growth factor sensitivity leading to damped RAF-MAPK and phosphoinositide 3-kinases-AKT signalling response. Our data support the idea that a variable range of dysregulated HRAS-dependent signalling dynamics, rather than static activation of HRAS-dependent signal flow, may underlie the phenotypic variability in CS.
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Affiliation(s)
- K W Gripp
- Division of Medical Genetics, A. I. duPont Hospital for Children/Nemours, Wilmington, Delaware
| | - V Kolbe
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - L I Brandenstein
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - G Rosenberger
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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18
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Novel pathogenic variant in the HRAS gene with lethal outcome and a broad phenotypic spectrum among Polish patients with Costello syndrome. Clin Dysmorphol 2016; 26:83-90. [PMID: 28027064 DOI: 10.1097/mcd.0000000000000165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Costello syndrome (CS) is a rare congenital disorder from the group of RASopathies, characterized by a distinctive facial appearance, failure to thrive, cardiac and skin anomalies, intellectual disability, and a predisposition to neoplasia. CS is associated with germline mutations in the proto-oncogene HRAS, a small GTPase from the Ras family. In this study, a molecular and clinical analysis was carried out in eight Polish patients with the Costello phenotype. A molecular test showed two known heterozygous mutations in the first coding exon of the gene in seven patients: p.G12S (n=4) and p.G12A (n=3), and a novel pathogenic variant p.G60V in one child with an unusually severe, lethal course of the syndrome. In addition, a fatal course of CS was present in one patient with the p.G12A mutation and in another with p.G12S, there was a co-occurrence of Turner syndrome because of the distal Xp deletion. A severe clinical manifestation with a lethal outcome in an individual with p.G60V in HRAS and contrary observations of an attenuated phenotype in CS patients with other mutations at glycine-60 residue may suggest that the nature of the substituted amino acid plays a significant role in the clinical variability observed in some CS cases.
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19
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Sana ME, Quilliam LA, Spitaleri A, Pezzoli L, Marchetti D, Lodrini C, Candiago E, Lincesso AR, Ferrazzi P, Iascone M. A Novel HRAS Mutation Independently Contributes to Left Ventricular Hypertrophy in a Family with a Known MYH7 Mutation. PLoS One 2016; 11:e0168501. [PMID: 28002430 PMCID: PMC5176172 DOI: 10.1371/journal.pone.0168501] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 11/30/2016] [Indexed: 01/19/2023] Open
Abstract
Several genetic conditions can lead to left ventricular hypertrophy (LVH). Among them, hypertrophic cardiomyopathy (HCM), caused by mutations in sarcomere genes, is the most common inherited cardiac disease. Instead, RASopathies, a rare class of disorders characterized by neuro-cardio-facial-cutaneous abnormalities and sometimes presenting with LVH, are caused by mutations in the RAS-MAPK pathway. We report on a 62-years-old male who presented isolated severe obstructive LVH but did not carry the sarcomere mutation previously identified in his affected relatives. By exome sequencing, we detected a novel mutation in HRAS gene (NM_005343.2:p.Arg68Trp), present also in the proband’s daughter, who showed mild LVH and severe intellectual disability. The cardiac phenotype was indistinguishable between family members carrying either mutation. In silico studies suggested that the mutated HRAS protein is constitutionally activated. Consistently, functional characterization in vitro confirmed elevated HRAS-GTP accumulation and downstream RAS-MAPK pathway activation that are known to drive cell proliferation in LVH. Our study emphasizes the role of RAS signaling in cardiac hypertrophy and highlights the complexity in differential diagnosis of RASopathies. In fact, the mild features of RASopathy and the recurrence of sarcomeric HCM in this family delayed the correct diagnosis until comprehensive genetic testing was performed.
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Affiliation(s)
- Maria Elena Sana
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
- FROM Research Foundation, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Lawrence A. Quilliam
- Department of Biochemistry and Molecular Biology, Indiana University, Indianapolis, Indiana, United States of America
| | | | - Laura Pezzoli
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Daniela Marchetti
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Chiara Lodrini
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Elisabetta Candiago
- USC di Anatomia Patologica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Anna Rita Lincesso
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
| | - Paolo Ferrazzi
- Centro per la Cardiomiopatia Ipertrofica e le Cardiopatie Valvolari, Policlinico di Monza, Monza, Italy
| | - Maria Iascone
- USSD Laboratorio di Genetica Medica, Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII, Bergamo, Italy
- * E-mail:
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