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Chesneau B, Plancke A, Rolland G, Chassaing N, Coubes C, Brischoux-Boucher E, Edouard T, Dulac Y, Aubert-Mucca M, Lavabre-Bertrand T, Plaisancié J, Khau Van Kien P. Parental mosaicism in Marfan and Ehlers-Danlos syndromes and related disorders. Eur J Hum Genet 2021; 29:771-779. [PMID: 33414558 PMCID: PMC8110803 DOI: 10.1038/s41431-020-00797-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 11/25/2020] [Accepted: 12/02/2020] [Indexed: 01/29/2023] Open
Abstract
Marfan syndrome (MFS) is a heritable connective tissue disorder (HCTD) caused by pathogenic variants in FBN1 that frequently occur de novo. Although individuals with somatogonadal mosaicisms have been reported with respect to MFS and other HCTD, the overall frequency of parental mosaicism in this pathology is unknown. In an attempt to estimate this frequency, we reviewed all the 333 patients with a disease-causing variant in FBN1. We then used direct sequencing, combined with High Resolution Melting Analysis, to detect mosaicism in their parents, complemented by NGS when a mosaicism was objectivized. We found that (1) the number of apparently de novo events is much higher than the classically admitted number (around 50% of patients and not 25% as expected for FBN1) and (2) around 5% of the FBN1 disease-causing variants were not actually de novo as anticipated, but inherited in a context of somatogonadal mosaicisms revealed in parents from three families. High Resolution Melting Analysis and NGS were more efficient at detecting and evaluating the level of mosaicism compared to direct Sanger sequencing. We also investigated individuals with a causal variant in another gene identified through our "aortic diseases genes" NGS panel and report, for the first time, on an individual with a somatogonadal mosaicism in COL5A1. Our study shows that parental mosaicism is not that rare in Marfan syndrome and should be investigated with appropriate methods given its implications in patient's management.
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Affiliation(s)
- Bertrand Chesneau
- UF de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France ,Centre de Référence du Syndrome de Marfan et des Syndromes Apparentés, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Aurélie Plancke
- UF de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Guillaume Rolland
- UF de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Nicolas Chassaing
- Service de Génétique Médicale, Hôpital Purpan, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Christine Coubes
- Service de Génétique Clinique, Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Hôpital Arnaud de Villeneuve, Centre Hospitalier Universitaire de Montpellier, Montpellier, France
| | | | - Thomas Edouard
- Centre de Référence du Syndrome de Marfan et des Syndromes Apparentés, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Yves Dulac
- Centre de Référence du Syndrome de Marfan et des Syndromes Apparentés, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Marion Aubert-Mucca
- Centre de Référence du Syndrome de Marfan et des Syndromes Apparentés, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, Toulouse, France ,Service de Génétique Médicale, Hôpital Purpan, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Thierry Lavabre-Bertrand
- UF de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Julie Plaisancié
- Centre de Référence du Syndrome de Marfan et des Syndromes Apparentés, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, Toulouse, France ,Service de Génétique Médicale, Hôpital Purpan, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Philippe Khau Van Kien
- UF de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
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2
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Fernández-Álvarez P, Codina-Sola M, Valenzuela I, Teixidó-Turá G, Cueto-González A, Paramonov I, Antolín M, López-Grondona F, Vendrell T, Evangelista A, García-Arumí E, Tizzano EF. A systematic study and literature review of parental somatic mosaicism of FBN1 pathogenic variants in Marfan syndrome. J Med Genet 2021; 59:605-612. [PMID: 33910934 DOI: 10.1136/jmedgenet-2020-107604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 03/31/2021] [Accepted: 04/01/2021] [Indexed: 11/03/2022]
Abstract
BACKGROUND A proportion of de novo variants in patients affected by genetic disorders, particularly those with autosomal dominant (AD) inheritance, could be the consequence of somatic mosaicism in one of the progenitors. There is growing evidence that germline and somatic mosaicism are more common and play a greater role in genetic disorders than previously acknowledged. In Marfan syndrome (MFS), caused by pathogenic variants in the fibrillin-1 gene (FBN1) gene, approximately 25% of the disease-causing variants are reported as de novo. Only a few cases of parental mosaicism have been reported in MFS. METHODS Employing an amplicon-based deep sequencing (ADS) method, we carried out a systematic analysis of 60 parents of 30 FBN1 positive, consecutive patients with MFS with an apparently de novo pathogenic variant. RESULTS Out of the 60 parents studied (30 families), the majority (n=51, 85%) had a systemic score of 0, seven had a score of 1 and two a score of 2, all due to minor criteria common in the normal population. We detected two families with somatic mosaicism in one of the progenitors, with a rate of 6.6% (2/30) of apparently de novo cases. CONCLUSIONS The search for parental somatic mosaicism should be routinely implemented in de novo cases of MFS, to offer appropriate genetic and reproductive counselling as well as to reveal masked, isolated clinical signs of MFS in progenitors that may require specific follow-up.
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Affiliation(s)
- Paula Fernández-Álvarez
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Marta Codina-Sola
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Irene Valenzuela
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Gisela Teixidó-Turá
- Department of Cardiology, Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | - Anna Cueto-González
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Ida Paramonov
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - María Antolín
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Fermina López-Grondona
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Teresa Vendrell
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Artur Evangelista
- Department of Cardiology, Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | - Elena García-Arumí
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain.,Departament de Patologia Neuromuscular i Mitocondrial, Biomedical Network Research Centre on Rare Diseases (CIBERER), Vall d'Hebron Institut de Recerca, Barcelona, Spain
| | - Eduardo F Tizzano
- Department of Clinical and Molecular Genetics, Hospital Universitari Vall d'Hebron, Barcelona, Spain .,Medicine Genetics Group, Vall d'Hebron Institut de Recerca, Barcelona, Spain
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3
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RET somatic mutations are underrecognized in Hirschsprung disease. Genet Med 2017; 20:770-777. [PMID: 29261189 DOI: 10.1038/gim.2017.178] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 09/12/2017] [Indexed: 12/19/2022] Open
Abstract
PURPOSE We aimed to determine the frequency of RET mosaicism in Hirschsprung disease (HSCR), test whether it has been underestimated, and to assess its contribution to HSCR risk. METHODS Targeted exome sequencing (n = 83) and RET single-gene screening (n = 69) were performed. Amplicon-based deep sequencing was applied on multiple tissue samples. TA cloning and sequencing were conducted for validation. RESULTS We identified eight de novo mutations in 152 patients (5.2%), of which six were pathogenic mosaic mutations. Two of these patients were somatic mosaics, with mutations detected in blood, colon, and saliva (mutant allele frequency: 35-44%). In addition, germ-line mosaicism was identified in four clinically unaffected subjects, each with an affected child, in multiple tissues (mutant allele frequency: 1-28%). CONCLUSION Somatic mutations of the RET gene are underrecognized in HSCR. Molecular investigation of the parents of patients with seemingly sporadic mutations is essential to determine recurrence risk in these families.
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4
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A Case Based Approach to Clinical Genetics of Thoracic Aortic Aneurysm/Dissection. BIOMED RESEARCH INTERNATIONAL 2016; 2016:9579654. [PMID: 27314043 PMCID: PMC4897665 DOI: 10.1155/2016/9579654] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/30/2016] [Accepted: 04/19/2016] [Indexed: 12/04/2022]
Abstract
Thoracic aortic aneurysm/dissection (TAAD) is a potential lethal condition with a rising incidence. This condition may occur sporadically; nevertheless, it displays familial clustering in >20% of the cases. Family history confers a six- to twentyfold increased risk of TAAD and has to be considered in the identification and evaluation of patients needing an adequate clinical follow-up. Familial TAAD recognizes a number of potential etiologies with a significant genetic heterogeneity, in either syndromic or nonsyndromic forms of the manifestation. The clinical impact and the management of patients with TAAD differ according to the syndromic and nonsyndromic forms of the manifestation. The clinical management of TAAD patients varies, depending on the different forms. Starting from the description of patient history, in this paper, we summarized the state of the art concerning assessment of clinical/genetic profile and therapeutic management of TAAD patients.
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5
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Le Gloan L, Hauet Q, David A, Hanna N, Arfeuille C, Arnaud P, Boileau C, Romefort B, Benbrik N, Gournay V, Joram N, Baron O, Isidor B. Neonatal Marfan Syndrome: Report of a Case with an Inherited Splicing Mutation outside the Neonatal Domain. Mol Syndromol 2016; 6:281-6. [PMID: 27022329 DOI: 10.1159/000443867] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2015] [Indexed: 11/19/2022] Open
Abstract
We report a child and her mother affected by Marfan syndrome. The child presented with a phenotype of neonatal Marfan syndrome, revealed by acute and refractory heart failure, finally leading to death within the first 4 months of life. Her mother had a common clinical presentation. Genetic analysis revealed an inherited FBN1 mutation. This intronic mutation (c.6163+3_6163+6del), undescribed to date, leads to exon 49 skipping, corresponding to in-frame deletion of 42 amino acids (p.Ile2014_Asp2055del). FBN1 next-generation sequencing did not show any argument for mosaicism. Association in the same family of severe neonatal and classical Marfan syndrome illustrates the intrafamilial phenotype variability.
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Affiliation(s)
- Laurianne Le Gloan
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Quentin Hauet
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Albert David
- Génétique Médicale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Nadine Hanna
- Département de Génétique Moléculaire, Centre National de Référence pour le Syndrome de Marfan et Apparentés, INSERM LVTS U1148, Faculté Paris Diderot, AP-HP Hopital Bichat, Paris, France
| | - Chloé Arfeuille
- Département de Génétique Moléculaire, Centre National de Référence pour le Syndrome de Marfan et Apparentés, INSERM LVTS U1148, Faculté Paris Diderot, AP-HP Hopital Bichat, Paris, France
| | - Pauline Arnaud
- Département de Génétique Moléculaire, Centre National de Référence pour le Syndrome de Marfan et Apparentés, INSERM LVTS U1148, Faculté Paris Diderot, AP-HP Hopital Bichat, Paris, France
| | - Catherine Boileau
- Département de Génétique Moléculaire, Centre National de Référence pour le Syndrome de Marfan et Apparentés, INSERM LVTS U1148, Faculté Paris Diderot, AP-HP Hopital Bichat, Paris, France
| | - Bénédicte Romefort
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Nadir Benbrik
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Véronique Gournay
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Nicolas Joram
- Réanimation Pédiatrique, CHU de Nantes, Université de Nantes, Nantes, France
| | - Olivier Baron
- Cardiologie Pédiatrique et Congénitale, CHU de Nantes, Université de Nantes, Nantes, France
| | - Bertrand Isidor
- Génétique Médicale, CHU de Nantes, Université de Nantes, Nantes, France
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Jaradat SA, Abujamous LA, Al-Hawamdeh AA, Alawneh KM, Rawashdeh TA, Jaradat ZM. Two novel mutations of FBN1 in Jordanian patients with Marfan syndrome. Int J Clin Exp Med 2015; 8:18786-18792. [PMID: 26770496 PMCID: PMC4694396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
Marfan syndrome is an autosomal dominant inheritance disorder with a 1/5000-live-birth prevalence. More than 3000 mutations have been characterized thus far in the FBN1 gene. The goal of this study is to facilitate Marfan syndrome diagnosis in Jordanian patients using a molecular genetic testing. All of the 65 coding exons and flanking intronic sequences of the FBN1 gene were amplified using polymerase chain reaction and were subjected to sequencing in five unrelated Jordanian patients suspected of having Marfan syndrome. Four different mutations were identified, including two novel mutations: the c.1553dupG frame-shift (p.Tyr519Ilefs*14) and the c.6650G>A (p.Cys2217Tyr) missense mutations. Two other missense mutations, c.2243G>A (p.Cys748Tyr) and c.2432G>A (p.Cys811Tyr), have been previously detected. Patient number five was heterozygous for the synonymous substitution variant c.1875T>C (p.Asn625Asn; rs#25458). Additionally, eight variants in the intronic sequence of the FBN1 gene were identified, of which the c.2168-46A>G mutation was a new variant. The data provide molecular-based evidence linking Marfan syndrome to pathogenic mutations in the FBN1 gene among Jordanians for the first time. Thus, our results will contribute to the better management of the disease using molecular tools and will help in genetic counseling of the patients' families.
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Affiliation(s)
- Saied A Jaradat
- Princess Haya Biotechnology Center, Jordan University of Science and TechnologyIrbid 22110, Jordan
| | - Lama A Abujamous
- Princess Haya Biotechnology Center, Jordan University of Science and TechnologyIrbid 22110, Jordan
| | - Ali A Al-Hawamdeh
- Department of Pediatrics, Metabolic Genetics Clinic, Queen Rania Al-Abdullah Children’s Hospital, King Hussein Medical CentreAmman 11855, Jordan
| | - Khaldoon M Alawneh
- Department of Internal Medicine, King Abdullah University Hospital, Faculty of Medicine, Jordan University of Science and TechnologyJordan
| | - Tamara A Rawashdeh
- Princess Haya Biotechnology Center, Jordan University of Science and TechnologyIrbid 22110, Jordan
| | - Zaher M Jaradat
- Princess Haya Biotechnology Center, Jordan University of Science and TechnologyIrbid 22110, Jordan
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7
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Brue T, Quentien MH, Khetchoumian K, Bensa M, Capo-Chichi JM, Delemer B, Balsalobre A, Nassif C, Papadimitriou DT, Pagnier A, Hasselmann C, Patry L, Schwartzentruber J, Souchon PF, Takayasu S, Enjalbert A, Van Vliet G, Majewski J, Drouin J, Samuels ME. Mutations in NFKB2 and potential genetic heterogeneity in patients with DAVID syndrome, having variable endocrine and immune deficiencies. BMC MEDICAL GENETICS 2014; 15:139. [PMID: 25524009 PMCID: PMC4411703 DOI: 10.1186/s12881-014-0139-9] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Accepted: 12/11/2014] [Indexed: 01/09/2023]
Abstract
Background DAVID syndrome is a rare condition combining anterior pituitary hormone deficiency with common variable immunodeficiency. NFKB2 mutations have recently been identified in patients with ACTH and variable immunodeficiency. A similar mutation was previously found in Nfkb2 in the immunodeficient Lym1 mouse strain, but the effect of the mutation on endocrine function was not evaluated. Methods We ascertained six unrelated DAVID syndrome families. We performed whole exome and traditional Sanger sequencing to search for causal genes. Lym1 mice were examined for endocrine developmental anomalies. Results Mutations in the NFKB2 gene were identified in three of our families through whole exome sequencing, and in a fourth by direct Sanger sequencing. De novo origin of the mutations could be demonstrated in three of the families. All mutations lie near the C-terminus of the protein-coding region, near signals required for processing of NFΚB2 protein by the alternative pathway. Two of the probands had anatomical pituitary anomalies, and one had growth and thyroid hormone as well as ACTH deficiency; these findings have not been previously reported. Two children of one of the probands carried the mutation and have to date exhibited only an immune phenotype. No mutations were found near the C-terminus of NFKB2 in the remaining two probands; whole exome sequencing has been performed for one of these. Lym1 mice, carrying a similar Nfkb2 C-terminal mutation, showed normal pituitary anatomy and expression of proopiomelanocortin (POMC). Conclusions We confirm previous findings that mutations near the C-terminus of NFKB2 cause combined endocrine and immunodeficiencies. De novo status of the mutations was confirmed in all cases for which both parents were available. The mutations are consistent with a dominant gain-of-function effect, generating an unprocessed NFKB2 super-repressor protein. We expand the potential phenotype of such NFKB2 mutations to include additional pituitary hormone deficiencies as well as anatomical pituitary anomalies. The lack of an observable endocrine phenotype in Lym1 mice suggests that the endocrine component of DAVID syndrome is either not due to a direct role of NFKB pathways on pituitary development, or else that human and mouse pituitary development differ in its requirements for NFKB pathway function. Electronic supplementary material The online version of this article (doi:10.1186/s12881-014-0139-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Thierry Brue
- Aix-Marseille University, Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille (CRN2M), Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7286, Faculté de Médecine de Marseille, 13344, Marseille, France. .,Assistance Publique-Hôpitaux de Marseille (APHM), Department of Endocrinology, Centre de Référence des Maladies Rares d'Origine Hypophysaire, Hôpital de la Timone, 13005, Marseille, France.
| | - Marie-Hélène Quentien
- Aix-Marseille University, Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille (CRN2M), Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7286, Faculté de Médecine de Marseille, 13344, Marseille, France. .,Assistance Publique-Hôpitaux de Marseille (APHM), Department of Endocrinology, Centre de Référence des Maladies Rares d'Origine Hypophysaire, Hôpital de la Timone, 13005, Marseille, France.
| | - Konstantin Khetchoumian
- Laboratoire de Génétique moléculaire, Institut de recherches cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, QC, H2W 1R7, Canada.
| | - Marco Bensa
- Ospedale Bufalini, Department of Paediatrics, Cesena, FC, Italy.
| | | | - Brigitte Delemer
- Departments of Endocrinology and of Pediatrics, Centre Hospitalier Robert Debré, 51092, Reims, France.
| | - Aurelio Balsalobre
- Laboratoire de Génétique moléculaire, Institut de recherches cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, QC, H2W 1R7, Canada.
| | - Christina Nassif
- Centre de Recherche du CHU Ste-Justine, 3175 Cote Ste-Catherine, Montreal, QC, Canada.
| | - Dimitris T Papadimitriou
- Department of Pediatric-Adolescent Endocrinology and Diabetes, Athens Medical Center, Athens, Greece.
| | - Anne Pagnier
- Clinique universitaire de pédiatrie, CHU de Grenoble, Grenoble, France.
| | - Caroline Hasselmann
- Centre de Recherche du CHU Ste-Justine, 3175 Cote Ste-Catherine, Montreal, QC, Canada.
| | - Lysanne Patry
- Centre de Recherche du CHU Ste-Justine, 3175 Cote Ste-Catherine, Montreal, QC, Canada.
| | | | - Pierre-François Souchon
- Departments of Endocrinology and of Pediatrics, Centre Hospitalier Robert Debré, 51092, Reims, France.
| | - Shinobu Takayasu
- Laboratoire de Génétique moléculaire, Institut de recherches cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, QC, H2W 1R7, Canada.
| | - Alain Enjalbert
- Aix-Marseille University, Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille (CRN2M), Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7286, Faculté de Médecine de Marseille, 13344, Marseille, France. .,Assistance Publique-Hôpitaux de Marseille (APHM), Department of Endocrinology, Centre de Référence des Maladies Rares d'Origine Hypophysaire, Hôpital de la Timone, 13005, Marseille, France.
| | - Guy Van Vliet
- Endocrinology Service and Research Center, Department of Pediatrics, CHU Ste-Justine, University of Montreal, Montreal, QC, Canada.
| | - Jacek Majewski
- Department of Human Genetics, McGill University, Montreal, QC, Canada.
| | - Jacques Drouin
- Laboratoire de Génétique moléculaire, Institut de recherches cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, QC, H2W 1R7, Canada.
| | - Mark E Samuels
- Centre de Recherche du CHU Ste-Justine, 3175 Cote Ste-Catherine, Montreal, QC, Canada. .,Department of Medicine, University of Montreal, Montreal, QC, Canada.
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Šípek A, Grodecká L, Baxová A, Cibulková P, Dvořáková M, Mazurová S, Magner M, Zeman J, Honzík T, Freiberger T. NovelFBN1gene mutation and maternal germinal mosaicism as the cause of neonatal form of Marfan syndrome. Am J Med Genet A 2014; 164A:1559-64. [DOI: 10.1002/ajmg.a.36480] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 01/06/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Antonín Šípek
- Institute of Biology and Medical Genetics, First Faculty of Medicine; Charles University in Prague and General University Hospital; Prague Czech Republic
| | - Lucie Grodecká
- Molecular Genetics Laboratory; Centre for Cardiovascular Surgery and Transplantation; Brno Czech Republic
- Central European Institute of Technology; Masaryk University; Brno Czech Republic
| | - Alice Baxová
- Institute of Biology and Medical Genetics, First Faculty of Medicine; Charles University in Prague and General University Hospital; Prague Czech Republic
| | - Petra Cibulková
- AGEL Research and Training Institute-Nový Jičín Branch; AGEL Laboratories; Nový Jičín Czech Republic
| | - Magdaléna Dvořáková
- AGEL Research and Training Institute-Nový Jičín Branch; AGEL Laboratories; Nový Jičín Czech Republic
| | - Stella Mazurová
- Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
| | - Martin Magner
- Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
| | - Jiří Zeman
- Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
| | - Tomáš Honzík
- Department of Pediatrics and Adolescent Medicine, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
| | - Tomáš Freiberger
- Molecular Genetics Laboratory; Centre for Cardiovascular Surgery and Transplantation; Brno Czech Republic
- Central European Institute of Technology; Masaryk University; Brno Czech Republic
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9
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McInerney-Leo AM, Marshall MS, Gardiner B, Coucke PJ, Van Laer L, Loeys BL, Summers KM, Symoens S, West JA, West MJ, Paul Wordsworth B, Zankl A, Leo PJ, Brown MA, Duncan EL. Whole exome sequencing is an efficient, sensitive and specific method of mutation detection in osteogenesis imperfecta and Marfan syndrome. BONEKEY REPORTS 2013; 2:456. [PMID: 24501682 DOI: 10.1038/bonekey.2013.190] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/16/2013] [Accepted: 10/23/2013] [Indexed: 12/16/2022]
Abstract
Osteogenesis imperfecta (OI) and Marfan syndrome (MFS) are common Mendelian disorders. Both conditions are usually diagnosed clinically, as genetic testing is expensive due to the size and number of potentially causative genes and mutations. However, genetic testing may benefit patients, at-risk family members and individuals with borderline phenotypes, as well as improving genetic counseling and allowing critical differential diagnoses. We assessed whether whole exome sequencing (WES) is a sensitive method for mutation detection in OI and MFS. WES was performed on genomic DNA from 13 participants with OI and 10 participants with MFS who had known mutations, with exome capture followed by massive parallel sequencing of multiplexed samples. Single nucleotide polymorphisms (SNPs) and small indels were called using Genome Analysis Toolkit (GATK) and annotated with ANNOVAR. CREST, exomeCopy and exomeDepth were used for large deletion detection. Results were compared with the previous data. Specificity was calculated by screening WES data from a control population of 487 individuals for mutations in COL1A1, COL1A2 and FBN1. The target capture of five exome capture platforms was compared. All 13 mutations in the OI cohort and 9/10 in the MFS cohort were detected (sensitivity=95.6%) including non-synonymous SNPs, small indels (<10 bp), and a large UTR5/exon 1 deletion. One mutation was not detected by GATK due to strand bias. Specificity was 99.5%. Capture platforms and analysis programs differed considerably in their ability to detect mutations. Consumable costs for WES were low. WES is an efficient, sensitive, specific and cost-effective method for mutation detection in patients with OI and MFS. Careful selection of platform and analysis programs is necessary to maximize success.
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Affiliation(s)
- Aideen M McInerney-Leo
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia
| | - Mhairi S Marshall
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia
| | - Brooke Gardiner
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia
| | - Paul J Coucke
- Medical Genetics, The University Hospital Ghent , Gent, Belgium
| | - Lut Van Laer
- University of Antwerp, Antwerp University Hospital , Antwerp, Belgium
| | - Bart L Loeys
- University of Antwerp, Antwerp University Hospital , Antwerp, Belgium ; Department of Genetics, Radboud University Medical Center , Nijmegen, The Netherlands
| | - Kim M Summers
- The Roslin Institute and R(D)SVS, University of Edinburgh , Midlothian, UK
| | - Sofie Symoens
- Medical Genetics, The University Hospital Ghent , Gent, Belgium
| | - Jennifer A West
- The University of Qld Northside Clinical School, Prince Charles Hospital , Chermside, Queensland, Australia
| | - Malcolm J West
- The University of Qld Northside Clinical School, Prince Charles Hospital , Chermside, Queensland, Australia
| | - B Paul Wordsworth
- NIHR Oxford Musculoskeletal Biomedical Research Unit, Nuffield Orthopaedic Centre , Oxford, UK
| | - Andreas Zankl
- The University of Queensland, UQ Centre for Clinical Research , Herston, Queensland, Australia ; Sydney Medical School, University of Sydney , Sydney, New South Wales, Australia ; Academic Department of Medical Genetics, The Children's Hospital at Westmead , Sydney, New South Wales, Australia
| | - Paul J Leo
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia
| | - Matthew A Brown
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia
| | - Emma L Duncan
- The University of Queensland Diamantina Institute, Translational Research Institute, Princess Alexandra Hospital , Brisbane, Queensland, Australia ; Department of Endocrinology, Royal Brisbane and Women's Hospital , Herston, Queensland, Australia
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Meng B, Li H, Yang T, Huang S, Sun X, Yuan H. Identification of a novel FBN1 gene mutation in a Chinese family with Marfan syndrome. Mol Vis 2011; 17:2421-7. [PMID: 21976953 PMCID: PMC3185025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Accepted: 09/04/2011] [Indexed: 11/23/2022] Open
Abstract
PURPOSE To identify the mutation in the fibrillin-1 gene (FBN1) in a Chinese family with Marfan syndrome (MFS). METHODS Patients and family members were given complete physical, ophthalmic, and cardiovascular examinations. Genomic DNA was extracted from leukocytes of venous blood of six individuals in the family and 170 healthy Chinese individuals. All of the 65 coding exons and their flanking intronic boundaries of FBN1 were amplified in the proband by polymerase chain reaction and followed by direct sequencing. The mutation identified in the proband was screened in the other family members and the 170 healthy Chinese individuals by direct sequencing. Protein conservation analysis was performed in six species using an online ClustalW tool. Protein structure was modeled based on the Protein data bank and mutated in DeepView v4.0.1 to predict the functional consequences of the mutation. RESULTS A novel heterozygous c.3703T>C change in exon 29 of FBN1 was detected in the proband, which resulted in the substitution of serine by proline at codon 1235 (p.S1235P). This mutation was also present in two family members but absent in the other, unaffected family members and the 170 healthy Chinese individuals. The mutant residue located in the calcium binding epidermal growth factor-like#15 domain is highly conserved among mammalian species and could probably induce conformation change of the domain. CONCLUSIONS We indentified a novel p.S1235P mutation in FBN1, which is the causative mutation for MFS in this family. Our result expands the mutation spectrum of FBN1 and contributes to the study of the molecular pathogenesis of Marfan syndrome.
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Affiliation(s)
- Bo Meng
- Department of Ophthalmology, the 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Hongyi Li
- Department of Ophthalmology, the 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Tao Yang
- Department of Medical Genetics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, WHO Collaborating Centre for Community Control of Hereditary Diseases , Beijing, China
| | - Shangzhi Huang
- Department of Medical Genetics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, WHO Collaborating Centre for Community Control of Hereditary Diseases , Beijing, China
| | - Xian Sun
- Department of Oncology, the 3rd Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Huiping Yuan
- Department of Ophthalmology, the 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
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11
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Aatre RD, Day SM. Psychological Issues in Genetic Testing for Inherited Cardiovascular Diseases. ACTA ACUST UNITED AC 2011; 4:81-90. [DOI: 10.1161/circgenetics.110.957365] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Rajani D. Aatre
- From the Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI
| | - Sharlene M. Day
- From the Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan, Ann Arbor, MI
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12
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Arslan-Kirchner M, Arbustini E, Boileau C, Child A, Collod-Beroud G, De Paepe A, Epplen J, Jondeau G, Loeys B, Faivre L. Clinical utility gene card for: Marfan syndrome type 1 and related phenotypes [FBN1]. Eur J Hum Genet 2010; 18:ejhg201042. [PMID: 20372188 DOI: 10.1038/ejhg.2010.42] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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13
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Khan AO, Khalil DS, Al Sharif LJ, Al-Ghadhfan FE, Al Tassan NA. Germline Mosaicism for KIF21A Mutation (p.R954L) Mimicking Recessive Inheritance for Congenital Fibrosis of the Extraocular Muscles. Ophthalmology 2009; 117:154-8. [PMID: 19896199 DOI: 10.1016/j.ophtha.2009.06.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2009] [Revised: 05/09/2009] [Accepted: 06/12/2009] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE To document the genotype for familial congenital fibrosis of the extraocular muscles (CFEOM) with apparent autosomal recessive inheritance. DESIGN Interventional family study. PARTICIPANTS Two affected siblings, 3 asymptomatic siblings, and their 2 asymptomatic parents. METHODS Ophthalmologic examination and candidate gene analysis (KIF21A and PHOX2A from venous blood samples) of the 2 affected siblings and their parents; confirmatory testing for 3 available asymptomatic siblings. MAIN OUTCOME MEASURES Significant clinical observations and results of gene testing. RESULTS The 2 affected siblings had large-angle exotropia, moderate bilateral hypotropia, moderate bilateral ptosis, sluggish pupils, and almost complete ophthalmoloplegia with some abnormal synkinesis. The asymptomatic parents were not related and had unremarkable ophthalmic examinations. Four other siblings were normal by history; 3 underwent venous blood sampling for confirmatory testing. Candidate gene testing of PHOX2A, the gene for recessive CFEOM (CFEOM2), did not reveal mutation in the 2 patients or their parents. Sequencing of KIF21A, the gene for dominant CFEOM (CFEOM1), revealed heterozygous p.R954L in both affected individuals but in not in their parents or 3 asymptomatic siblings, consistent with parental germline mosaicism. Haplotype analysis suggested paternal inheritance but was not conclusive. CONCLUSIONS Parental germline mosaicism can mimic recessive inheritance in CFEOM and likely is underrecognized. Ophthalmologists should be aware of this phenomenon when counseling parents of children with apparent recessive (or de novo) hereditary eye disease. Unlike other reported KIF21A mutations that cause CFEOM1, the p.R954L variant seems to be associated with abnormal pupils. FINANCIAL DISCLOSURE(S) The author(s) have no proprietary or commercial interest in any materials discussed in this article.
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Affiliation(s)
- Arif O Khan
- Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Department of Genetics, Research Center, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
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Watanabe Y, Sakai H, Nishimura A, Miyake N, Saitsu H, Mizuguchi T, Matsumoto N. Paternal somatic mosaicism of aTGFBR2mutation transmitting to an affected son with Loeys-Dietz syndrome. Am J Med Genet A 2008; 146A:3070-4. [DOI: 10.1002/ajmg.a.32567] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Blyth M, Foulds N, Turner C, Bunyan D. Severe Marfan syndrome due to FBN1 exon deletions. Am J Med Genet A 2008; 146A:1320-4. [PMID: 18412115 DOI: 10.1002/ajmg.a.32229] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Marfan syndrome is an autosomal dominant condition, with manifestations mainly in the skeletal, ocular, and cardiovascular systems. The disorder is caused by mutations in fibrillin-1 gene (FBN1). The majority of these are family-specific point mutations, with a small number being predicted to cause exon-skipping. To date, there have only been five reports of in-frame exon deletions in FBN1, with the largest of these spanning three exons. Mosaicism is rarely recorded and has only been reported in the unaffected, or mildly affected, parents of probands. Here, we report on the clinical histories of two children with exon deletions in FBN1. Both have severe Marfan syndrome with significant signs in infancy. One patient has a deletion of exon 33, which has not previously been reported. The other has the largest reported deletion, which spans 37 exons, and also represents the first reported case of mosaicism in a patient with Marfan syndrome.
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Affiliation(s)
- Moira Blyth
- Wessex Clinical Genetics Service, Southampton, UK.
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16
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Ibeagha-Awemu EM, Kgwatalala P, Ibeagha AE, Zhao X. A critical analysis of disease-associated DNA polymorphisms in the genes of cattle, goat, sheep, and pig. Mamm Genome 2008; 19:226-45. [PMID: 18350334 PMCID: PMC2323435 DOI: 10.1007/s00335-008-9101-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Accepted: 02/11/2008] [Indexed: 10/29/2022]
Abstract
Genetic variations through their effects on gene expression and protein function underlie disease susceptibility in farm animal species. The variations are in the form of single nucleotide polymorphisms, deletions/insertions of nucleotides or whole genes, gene or whole chromosomal rearrangements, gene duplications, and copy number polymorphisms or variants. They exert varying degrees of effects on gene action, such as substitution of an amino acid for another, shift in reading frame and premature termination of translation, and complete deletion of entire exon(s) or gene(s) in diseased individuals. These factors influence gene function by affecting mRNA splicing pattern or by altering/eliminating protein function. Elucidating the genetic bases of diseases under the control of many genes is very challenging, and it is compounded by several factors, including host x pathogen x environment interactions. In this review, the genetic variations that underlie several diseases of livestock (under monogenic and polygenic control) are analyzed. Also, factors hampering research efforts toward identification of genetic influences on animal disease identification and control are highlighted. A better understanding of the factors analyzed could be better harnessed to effectively identify and control, genetically, livestock diseases. Finally, genetic control of animal diseases can reduce the costs associated with diseases, improve animal welfare, and provide healthy animal products to consumers, and should be given more attention.
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Affiliation(s)
- Eveline M Ibeagha-Awemu
- Department of Animal Science, McGill University, 21,111 Lakeshore Road, Ste Anne De Bellevue, Montreal, QC, Canada, H9X 3V9.
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17
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Tekin M, Cengiz FB, Ayberkin E, Kendirli T, Fitoz S, Tutar E, Ciftçi E, Conba A. Familial neonatal Marfan syndrome due to parental mosaicism of a missense mutation in the FBN1 gene. Am J Med Genet A 2007; 143A:875-80. [PMID: 17366579 DOI: 10.1002/ajmg.a.31660] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We present a family in which three siblings were born with neonatal Marfan syndrome (MFS) to unaffected parents. The clinical findings included joint contractures, large ears, loose skin, ectopia lentis, muscular hypoplasia, aortic root dilatation, mitral and tricuspid valve insufficiency, and pulmonary emphysema. All three siblings died due to cardiorespiratory insufficiency by 2-4 months of age. Screening of the FBN1 gene showed the heterozygous c.3257G > A (p.Cys1086Tyr) mutation in the proband. Mosaicism of the mutation was demonstrated in the somatic cells and in the germ line of the father. Although three examples of parental mosaicism for classical MFS were demonstrated previously, this is the first report of familial occurrence of neonatal MFS due to a heterozygous mutation in FBN1. In conclusion, the p.Cys1086Tyr mutation in FBN1 is consistently associated with neonatal MFS. Parental mosaicism should always be kept in mind when counseling families with MFS.
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Affiliation(s)
- Mustafa Tekin
- Division of Clinical Molecular Pathology and Genetics, Department of Pediatrics, Ankara University School of Medicine, Ankara, Turkey.
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18
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Tsubota A, Akiyama M, Sakai K, Goto M, Nomura Y, Ando S, Abe M, Sawamura D, Shimizu H. Keratin 1 gene mutation detected in epidermal nevus with epidermolytic hyperkeratosis. J Invest Dermatol 2007; 127:1371-4. [PMID: 17255957 DOI: 10.1038/sj.jid.5700712] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Since 1994, four cases of epidermal nevus with epidermolytic hyperkeratosis (EH) caused by keratin 10 gene mutations have been reported, although no keratin 1 (K1) gene mutation has yet been reported. We detected a K1 gene (KRT1) mutation in epidermal nevus with EH in a 10-year-old Japanese male. The patient showed well-demarcated verrucous, hyperkeratotic plaques mainly on the trunk, covering 15% of the entire body surface. No hyperkeratosis was seen on the palms or soles. He had no family history of skin disorders. His lesional skin showed typical granular degeneration and, ultrastructurally, clumped keratin filaments were observed in the upper epidermis. Direct sequence analysis of genomic DNA extracted from lesional skin revealed a heterozygous 5' donor splice site mutation c.591+2T>A in KRT1. This mutation was not detected in genomic DNA samples from the patient's peripheral blood leukocytes or those of other family members. The identical splice mutation was previously reported in a family with palmoplantar keratoderma and mild ichthyosis, and was demonstrated to result in a 22 amino-acid deletion p.Val175_Lys196del in the H1 and 1A domains of K1. To our knowledge, the present patient is the first reported case of epidermal nevus associated with EH caused by a K1 gene mutation in a mosaic pattern.
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Affiliation(s)
- Akiko Tsubota
- Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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Singleton AC, Mitchell AL, Byers PH, Potter KA, Pace JM. Bovine model of Marfan syndrome results from an amino acid change (c.3598G > A, p.E1200K) in a calcium-binding epidermal growth factor-like domain of fibrillin-1. Hum Mutat 2006; 25:348-52. [PMID: 15776436 DOI: 10.1002/humu.20152] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Marfan Syndrome (MFS) is an autosomal dominant disorder caused by mutations in the fibrillin-1 gene (FBN1). Several calves, all sired by a phenotypically normal bull, were found to exhibit the major clinical and pathological characteristics of human MFS (aortic dissection, joint laxity, lens dislocation), and were recognized as potential models of the human disease. In this study, Fbn1 cDNA from affected animals was sequenced and a heterozygous c.3598G > A transition was detected in exon 29, which predicted the substitution of an evolutionarily conserved glutamic acid by lysine at position 1200 (p.E1200K). This residue is part of a calcium-binding epidermal growth factor-like (cbEGF-like) module, a domain that is frequently altered in human MFS. Analysis of genomic DNA from the original bull's sperm showed that less than 20% of the sperm harbored the mutation, consistent with the presence of germline mosaicism. This study validates the use of these animals as models of human MFS. These cows will be valuable for investigations into the molecular pathogenesis of MFS, and may lead to better therapeutic testing and evaluation of human Marfan patients.
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Affiliation(s)
- Annie C Singleton
- School of Dentistry, University of Washington, Seattle, Washington, USA
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Robinson PN, Neumann LM, Tinschert S. Response to Kosaki et al. “Molecular pathology of Shprintzen-Goldberg syndrome”. Am J Med Genet A 2005. [DOI: 10.1002/ajmg.a.31007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Yazaki M, Yamashita T, Kincaid JC, Scott JR, Auger RG, Dyck PJ, Benson MD. Rapidly progressive amyloid polyneuropathy associated with a novel variant transthyretin serine 25. Muscle Nerve 2002; 25:244-50. [PMID: 11870693 DOI: 10.1002/mus.10032] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We report a 52-year-old woman with a novel transthyretin (TTR) variant serine replacing alanine at residue 25 [Ala25Ser (Serine 25)], who showed a unique clinical picture with a relatively acute onset neuropathy within a few days of an influenza vaccination, progressing to a severe degree within 2 years. Sural nerve biopsy revealed amyloid deposition in the endoneurium. Sequencing of the proband's DNA revealed a G to T transversion at the first position of codon 25 of TTR gene. DNA analysis of this family showed the same mutation in her older sister and a niece, but her parents did not have the mutation. Haplotype analysis revealed the mutation to be clearly linked to haplotype III allele inherited from the proband's father. These results indicate this novel Serine 25 mutation originated in the paternal germline mosaicism. It is possible that the vaccination had an influence on the unique clinical picture, but this remains uncertain.
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Affiliation(s)
- Masahide Yazaki
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, 975 West Walnut Street, IB-503, Indianapolis, Indiana 46202, USA
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Palz M, Tiecke F, Booms P, Göldner B, Rosenberg T, Fuchs J, Skovby F, Schumacher H, Kaufmann UC, von Kodolitsch Y, Nienaber CA, Leitner C, Katzke S, Vetter B, Hagemeier C, Robinson PN. Clustering of mutations associated with mild Marfan-like phenotypes in the 3' region of FBN1 suggests a potential genotype-phenotype correlation. AMERICAN JOURNAL OF MEDICAL GENETICS 2000; 91:212-21. [PMID: 10756346 DOI: 10.1002/(sici)1096-8628(20000320)91:3<212::aid-ajmg12>3.0.co;2-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Mutations in the gene for fibrillin-1 (FBN1) cause Marfan syndrome, a dominantly inherited disorder of connective tissue that primarily involves the cardiovascular, ocular, and skeletal systems. There is a remarkable degree of variability both within and between families with Marfan syndrome, and FBN1 mutations have also been found in a range of other related connective tissue disorders collectively termed type-1 fibrillinopathies. FBN1 mutations have been found in almost all of the 65 exons of the FBN1 gene and for the most part have been unique to one affected patient or family. Aside from the "hot spots" for the neonatal Marfan syndrome in exons 24-27 and 31-32, genotype-phenotype correlations have been slow to emerge. Here we present the results of temperature-gradient gel electrophoresis analysis of FBN1 exons 59-65. Six mutations were identified, only one of which had been previously reported. Two of the six mutations were found in patients with mild phenotypes. Taken together with other published reports, our results suggest that a sizable subset (ca. 40%) of mutations in this region is associated with mild phenotypes characterized by the lack of significant aortic pathology, compared with about 7% in the rest of the gene. In two cases, mutations affecting analogous positions within one of the 43 cbEGF modules of FBN1 are associated with mild phenotypes when found in one of the 6 C-terminal modules (encoded by exons 59-63), but are associated with classic or severe phenotypes when found in cbEGF modules elsewhere in the gene.
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Affiliation(s)
- M Palz
- Laboratory of Pediatric Molecular Biology, Department of General Pediatrics, Charité, Humboldt University, Berlin, Germany
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Collod-Béroud G, Lackmy-Port-Lys M, Jondeau G, Mathieu M, Maingourd Y, Coulon M, Guillotel M, Junien C, Boileau C. Demonstration of the recurrence of Marfan-like skeletal and cardiovascular manifestations due to germline mosaicism for an FBN1 mutation. Am J Hum Genet 1999; 65:917-21. [PMID: 10441597 PMCID: PMC1377997 DOI: 10.1086/302545] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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