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de Feraudy Y, Vandroux M, Romero NB, Schneider R, Saker S, Boland A, Deleuze JF, Biancalana V, Böhm J, Laporte J. Exome sequencing in undiagnosed congenital myopathy reveals new genes and refines genes-phenotypes correlations. Genome Med 2024; 16:87. [PMID: 38982518 PMCID: PMC11234750 DOI: 10.1186/s13073-024-01353-0] [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: 10/30/2023] [Accepted: 05/30/2024] [Indexed: 07/11/2024] Open
Abstract
BACKGROUND Congenital myopathies are severe genetic diseases with a strong impact on patient autonomy and often on survival. A large number of patients do not have a genetic diagnosis, precluding genetic counseling and appropriate clinical management. Our objective was to find novel pathogenic variants and genes associated with congenital myopathies and to decrease diagnostic odysseys and dead-end. METHODS To identify pathogenic variants and genes implicated in congenital myopathies, we established and conducted the MYOCAPTURE project from 2009 to 2018 to perform exome sequencing in a large cohort of 310 families partially excluded for the main known genes. RESULTS Pathogenic variants were identified in 156 families (50%), among which 123 families (40%) had a conclusive diagnosis. Only 44 (36%) of the resolved cases were linked to a known myopathy gene with the corresponding phenotype, while 55 (44%) were linked to pathogenic variants in a known myopathy gene with atypical signs, highlighting that most genetic diagnosis could not be anticipated based on clinical-histological assessments in this cohort. An important phenotypic and genetic heterogeneity was observed for the different genes and for the different congenital myopathy subtypes, respectively. In addition, we identified 14 new myopathy genes not previously associated with muscle diseases (20% of all diagnosed cases) that we previously reported in the literature, revealing novel pathomechanisms and potential therapeutic targets. CONCLUSIONS Overall, this approach illustrates the importance of massive parallel gene sequencing as a comprehensive tool for establishing a molecular diagnosis for families with congenital myopathies. It also emphasizes the contribution of clinical data, histological findings on muscle biopsies, and the availability of DNA samples from additional family members to the diagnostic success rate. This study facilitated and accelerated the genetic diagnosis of congenital myopathies, improved health care for several patients, and opened novel perspectives for either repurposing of existing molecules or the development of novel treatments.
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Affiliation(s)
- Yvan de Feraudy
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France
- Department of Pediatric Neurology, CHU Strasbourg, Strasbourg, France
- Centre de Référence Neuromusculaire Nord-Est-Île de France, Strasbourg, France
| | - Marie Vandroux
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France
| | - Norma Beatriz Romero
- Myology Institute, Neuromuscular Morphology Unit, Sorbonne Université, INSERM, GHU Pitié-Salpêtrière, Paris, France
| | - Raphaël Schneider
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France
| | - Safaa Saker
- Genethon, DNA and Cell Bank, Evry, 91000, France
| | - Anne Boland
- Centre National de Recherche en Génomique Humaine (CNRGH), Université Paris-Saclay, CEA, Evry, 91057, France
| | - Jean-François Deleuze
- Centre National de Recherche en Génomique Humaine (CNRGH), Université Paris-Saclay, CEA, Evry, 91057, France
| | - Valérie Biancalana
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France
- Laboratoire de Diagnostic Génétique CHRU de Strasbourg, Strasbourg, 67091, France
| | - Johann Böhm
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France
| | - Jocelyn Laporte
- IGBMC, Inserm U1258, Cnrs UMR7104, Université de Strasbourg, 1 Rue Laurent Fries, Illkirch, 67404, France.
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2
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Lehtonen J, Sulonen AM, Almusa H, Lehtokari VL, Johari M, Palva A, Hakonen AH, Wartiovaara K, Lehesjoki AE, Udd B, Wallgren-Pettersson C, Pelin K, Savarese M, Saarela J. Haplotype information of large neuromuscular disease genes provided by linked-read sequencing has a potential to increase diagnostic yield. Sci Rep 2024; 14:4306. [PMID: 38383731 PMCID: PMC10881483 DOI: 10.1038/s41598-024-54866-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 02/17/2024] [Indexed: 02/23/2024] Open
Abstract
Rare or novel missense variants in large genes such as TTN and NEB are frequent in the general population, which hampers the interpretation of putative disease-causing biallelic variants in patients with sporadic neuromuscular disorders. Often, when the first initial genetic analysis is performed, the reconstructed haplotype, i.e. phasing information of the variants is missing. Segregation analysis increases the diagnostic turnaround time and is not always possible if samples from family members are lacking. To overcome this difficulty, we investigated how well the linked-read technology succeeded to phase variants in these large genes, and whether it improved the identification of structural variants. Linked-read sequencing data of nemaline myopathy, distal myopathy, and proximal myopathy patients were analyzed for phasing, single nucleotide variants, and structural variants. Variant phasing was successful in the large muscle genes studied. The longest continuous phase blocks were gained using high-quality DNA samples with long DNA fragments. Homozygosity increased the number of phase blocks, especially in exome sequencing samples lacking intronic variation. In our cohort, linked-read sequencing added more information about the structural variation but did not lead to a molecular genetic diagnosis. The linked-read technology can support the clinical diagnosis of neuromuscular and other genetic disorders.
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Affiliation(s)
- Johanna Lehtonen
- Centre for Molecular Medicine Norway (NCMM), University of Oslo, Oslo, Norway
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Anna-Maija Sulonen
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
| | - Henrikki Almusa
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
| | - Vilma-Lotta Lehtokari
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Mridul Johari
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Harry Perkins Institute of Medical Research, Centre for Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - Aino Palva
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
| | - Anna H Hakonen
- Clinical Genetics, Helsinki University Hospital, Helsinki, Finland
| | | | - Anna-Elina Lehesjoki
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Carina Wallgren-Pettersson
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Katarina Pelin
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Marco Savarese
- Folkhälsan Research Center, Folkhälsan Institute of Genetics, Helsinki, Finland
- Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Janna Saarela
- Centre for Molecular Medicine Norway (NCMM), University of Oslo, Oslo, Norway.
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland.
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway.
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3
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Lehtokari VL, Sagath L, Davis M, Ho D, Kiiski K, Kettunen K, Demczko M, Stein R, Vatta M, Winder TL, Shohet A, Orenstein N, Krcho P, Bohuš P, Huovinen S, Udd B, Pelin K, Laing NG, Wallgren-Pettersson C. A recurrent ACTA1 amino acid change in mosaic form causes milder asymmetric myopathy. Neuromuscul Disord 2024; 34:32-40. [PMID: 38142473 DOI: 10.1016/j.nmd.2023.11.009] [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: 06/27/2023] [Revised: 10/25/2023] [Accepted: 11/26/2023] [Indexed: 12/26/2023]
Abstract
We describe three patients with asymmetric congenital myopathy without definite nemaline bodies and one patient with severe nemaline myopathy. In all four patients, the phenotype had been caused by pathogenic missense variants in ACTA1 leading to the same amino acid change, p.(Gly247Arg). The three patients with milder myopathy were mosaic for their variants. In contrast, in the severely affected patient, the missense variant was present in a de novo, constitutional form. The grade of mosaicism in the three mosaic patients ranged between 20 % and 40 %. We speculate that the milder clinical and histological manifestations of the same ACTA1 variant in the patients with mosaicism reflect the lower abundance of mutant actin in their muscle tissue. Similarly, the asymmetry of body growth and muscle weakness may be a consequence of the affected cells being unevenly distributed. The partial improvement in muscle strength with age in patients with mosaicism might be due to an increased proportion over time of nuclei carrying and expressing two normal alleles.
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Affiliation(s)
- Vilma-Lotta Lehtokari
- Folkhälsan Research Center, 00290 Helsinki, Finland; Department of Medical and Clinical Genetics, Medicum, 00014 University of Helsinki, Finland.
| | - Lydia Sagath
- Folkhälsan Research Center, 00290 Helsinki, Finland; Department of Medical and Clinical Genetics, Medicum, 00014 University of Helsinki, Finland
| | - Mark Davis
- Department of Diagnostic Genomics, PathWest Laboratory Medicine WA, Nedlands WA 6009, SA
| | - Desiree Ho
- Department of Diagnostic Genomics, PathWest Laboratory Medicine WA, Nedlands WA 6009, SA
| | - Kirsi Kiiski
- Folkhälsan Research Center, 00290 Helsinki, Finland; Laboratory of Genetics, Division of Genetics and Clinical Pharmacology, HUS Diagnostic Center, 00029 Helsinki University Hospital and 00014 University of Helsinki, Helsinki, Finland
| | - Kaisa Kettunen
- Laboratory of Genetics, Division of Genetics and Clinical Pharmacology, HUS Diagnostic Center, 00029 Helsinki University Hospital and 00014 University of Helsinki, Helsinki, Finland
| | - Matthew Demczko
- Division of Diagnostic Referral Services, Nemours Children's Hospital, Wilmington, DE 19803, United States
| | - Riki Stein
- Genetics Unit, Schneider Children's Medical Center, Petach Tikva 4920235, Israel
| | - Matteo Vatta
- Invitae Corporation, San Francisco, CA 94103, United States
| | | | - Adi Shohet
- Genetics Unit, Schneider Children's Medical Center, Petach Tikva 4920235, Israel
| | - Naama Orenstein
- Genetics Unit, Schneider Children's Medical Center, Petach Tikva 4920235, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
| | - Peter Krcho
- Department of Neonatology, Pavol Jozef Safarik University, 041 80 Košice, Slovakia
| | - Peter Bohuš
- Department of Pathology, L. Pasteur University Hospital, 040 11 Košice, Slovakia
| | - Sanna Huovinen
- Department of Pathology, Fimlab Laboratories, Tampere University Hospital, 33101 Tampere, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, 00290 Helsinki, Finland; Neuromuscular Research Center, Department of Neurology, Tampere University and University Hospital, 33520 Tampere, Finland; Department of Neurology, Vaasa Central Hospital, 65130 Vaasa, Finland
| | - Katarina Pelin
- Folkhälsan Research Center, 00290 Helsinki, Finland; Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, 00014 University of Helsinki, Finland
| | - Nigel G Laing
- Department of Diagnostic Genomics, PathWest Laboratory Medicine WA, Nedlands WA 6009, SA; Harry Perkins Institute of Medical Research, and University of Western Australia Centre for Medical Research, Nedlands Western Australia 6009, Australia
| | - Carina Wallgren-Pettersson
- Folkhälsan Research Center, 00290 Helsinki, Finland; Department of Medical and Clinical Genetics, Medicum, 00014 University of Helsinki, Finland
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4
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Bai Y, Zhao F, Wu T, Chen F, Pang X. Actin polymerization and depolymerization in developing vertebrates. Front Physiol 2023; 14:1213668. [PMID: 37745245 PMCID: PMC10515290 DOI: 10.3389/fphys.2023.1213668] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 08/22/2023] [Indexed: 09/26/2023] Open
Abstract
Development is a complex process that occurs throughout the life cycle. F-actin, a major component of the cytoskeleton, is essential for the morphogenesis of tissues and organs during development. F-actin is formed by the polymerization of G-actin, and the dynamic balance of polymerization and depolymerization ensures proper cellular function. Disruption of this balance results in various abnormalities and defects or even embryonic lethality. Here, we reviewed recent findings on the structure of G-actin and F-actin and the polymerization of G-actin to F-actin. We also focused on the functions of actin isoforms and the underlying mechanisms of actin polymerization/depolymerization in cellular and organic morphogenesis during development. This information will extend our understanding of the role of actin polymerization in the physiologic or pathologic processes during development and may open new avenues for developing therapeutics for embryonic developmental abnormalities or tissue regeneration.
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Affiliation(s)
- Yang Bai
- Stomatological Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Feng Zhao
- Stomatological Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Tingting Wu
- Stomatological Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Fangchun Chen
- Stomatological Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Xiaoxiao Pang
- Stomatological Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
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5
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Nemaline Myopathy in Brazilian Patients: Molecular and Clinical Characterization. Int J Mol Sci 2022; 23:ijms231911995. [PMID: 36233295 PMCID: PMC9569467 DOI: 10.3390/ijms231911995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/10/2022] [Accepted: 09/27/2022] [Indexed: 11/07/2022] Open
Abstract
Nemaline myopathy (NM), a structural congenital myopathy, presents a significant clinical and genetic heterogeneity. Here, we compiled molecular and clinical data of 30 Brazilian patients from 25 unrelated families. Next-generation sequencing was able to genetically classify all patients: sixteen families (64%) with mutation in NEB, five (20%) in ACTA1, two (8%) in KLHL40, and one in TPM2 (4%) and TPM3 (4%). In the NEB-related families, 25 different variants, 11 of them novel, were identified; splice site (10/25) and frame shift (9/25) mutations were the most common. Mutation c.24579 G>C was recurrent in three unrelated patients from the same region, suggesting a common ancestor. Clinically, the “typical” form was the more frequent and caused by mutations in the different NM genes. Phenotypic heterogeneity was observed among patients with mutations in the same gene. Respiratory involvement was very common and often out of proportion with limb weakness. Muscle MRI patterns showed variability within the forms and genes, which was related to the severity of the weakness. Considering the high frequency of NEB mutations and the complexity of this gene, NGS tools should be combined with CNV identification, especially in patients with a likely non-identified second mutation.
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6
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Koczwara KE, Lake NJ, DeSimone AM, Lek M. Neuromuscular disorders: finding the missing genetic diagnoses. Trends Genet 2022; 38:956-971. [PMID: 35908999 DOI: 10.1016/j.tig.2022.07.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 11/24/2022]
Abstract
Neuromuscular disorders (NMDs) are a wide-ranging group of diseases that seriously affect the quality of life of affected individuals. The development of next-generation sequencing revolutionized the diagnosis of NMD, enabling the discovery of hundreds of NMD genes and many more pathogenic variants. However, the diagnostic yield of genetic testing in NMD cohorts remains incomplete, indicating a large number of genetic diagnoses are not identified through current methods. Fortunately, recent advancements in sequencing technologies, analytical tools, and high-throughput functional screening provide an opportunity to circumvent current challenges. Here, we discuss reasons for missing genetic diagnoses in NMD, how emerging technologies and tools can overcome these hurdles, and examine future approaches to improving diagnostic yields in NMD.
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Affiliation(s)
- Katherine E Koczwara
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Nicole J Lake
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Alec M DeSimone
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Monkol Lek
- Department of Genetics, Yale University School of Medicine, New Haven, CT 06510, USA.
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7
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Labasse C, Brochier G, Taratuto AL, Cadot B, Rendu J, Monges S, Biancalana V, Quijano-Roy S, Bui MT, Chanut A, Madelaine A, Lacène E, Beuvin M, Amthor H, Servais L, de Feraudy Y, Erro M, Saccoliti M, Neto OA, Fauré J, Lannes B, Laugel V, Coppens S, Lubieniecki F, Bello AB, Laing N, Evangelista T, Laporte J, Böhm J, Romero NB. Severe ACTA1-related nemaline myopathy: intranuclear rods, cytoplasmic bodies, and enlarged perinuclear space as characteristic pathological features on muscle biopsies. Acta Neuropathol Commun 2022; 10:101. [PMID: 35810298 PMCID: PMC9271256 DOI: 10.1186/s40478-022-01400-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 06/19/2022] [Indexed: 11/10/2022] Open
Abstract
Nemaline myopathy (NM) is a muscle disorder with broad clinical and genetic heterogeneity. The clinical presentation of affected individuals ranges from severe perinatal muscle weakness to milder childhood-onset forms, and the disease course and prognosis depends on the gene and mutation type. To date, 14 causative genes have been identified, and ACTA1 accounts for more than half of the severe NM cases. ACTA1 encodes α-actin, one of the principal components of the contractile units in skeletal muscle. We established a homogenous cohort of ten unreported families with severe NM, and we provide clinical, genetic, histological, and ultrastructural data. The patients manifested antenatal or neonatal muscle weakness requiring permanent respiratory assistance, and most deceased within the first months of life. DNA sequencing identified known or novel ACTA1 mutations in all. Morphological analyses of the muscle biopsy specimens showed characteristic features of NM histopathology including cytoplasmic and intranuclear rods, cytoplasmic bodies, and major myofibrillar disorganization. We also detected structural anomalies of the perinuclear space, emphasizing a physiological contribution of skeletal muscle α-actin to nuclear shape. In-depth investigations of the nuclei confirmed an abnormal localization of lamin A/C, Nesprin-1, and Nesprin-2, forming the main constituents of the nuclear lamina and the LINC complex and ensuring nuclear envelope integrity. To validate the relevance of our findings, we examined muscle samples from three previously reported ACTA1 cases, and we identified the same set of structural aberrations. Moreover, we measured an increased expression of cardiac α-actin in the muscle samples from the patients with longer lifespan, indicating a potential compensatory effect. Overall, this study expands the genetic and morphological spectrum of severe ACTA1-related nemaline myopathy, improves molecular diagnosis, highlights the enlargement of the perinuclear space as an ultrastructural hallmark, and indicates a potential genotype/phenotype correlation.
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Affiliation(s)
- Clémence Labasse
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Guy Brochier
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Ana-Lia Taratuto
- Neuropathology and Neuromuscular Diseases Laboratory, Buenos Aires, Argentina
| | - Bruno Cadot
- Sorbonne Université, INSERM, Center for Research in Myology, Myology Institute, APHP, GHU Pitié-Salpêtrière, Paris, France
| | - John Rendu
- Laboratoire de Biochimie Et Génétique Moléculaire, Pôle de Biologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, Grenoble, France
| | - Soledad Monges
- Servucio de Neurología Et Neuropatología, Hospital de Pediatría J.P. Garrahan, Buenos Aires, Argentina
| | - Valérie Biancalana
- Institut de Génétique Et de Biologie Moléculaire Et Cellulaire (IGBMC), Inserm U 1258, CNRS UMR 7104, Université de Strasbourg, Illkirch, France.,Laboratoire de Diagnostic Génétique, Faculté de Médecine, CHRU, Strasbourg, France
| | - Susana Quijano-Roy
- APHP Université Paris-Saclay, Pediatric Neuromuscular Unit, Hôpital Universitaire Raymond-Poincaré, Université de Versailles Saint-Quentin-en-Yvelines, Garches, France
| | - Mai Thao Bui
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Anaïs Chanut
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Angéline Madelaine
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Emmanuelle Lacène
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France
| | - Maud Beuvin
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France.,Sorbonne Université, INSERM, Center for Research in Myology, Myology Institute, APHP, GHU Pitié-Salpêtrière, Paris, France
| | - Helge Amthor
- APHP Université Paris-Saclay, Pediatric Neuromuscular Unit, Hôpital Universitaire Raymond-Poincaré, Université de Versailles Saint-Quentin-en-Yvelines, Garches, France
| | - Laurent Servais
- Centre de Références Des Maladies Neuromusculaires, Department of Paediatrics, University Hospital Liège & University of Liège, Liège, Belgium.,Department of Paediatrics, MDUK Oxford Neuromuscular Centre, University of Oxford, Oxford, UK
| | - Yvan de Feraudy
- Institut de Génétique Et de Biologie Moléculaire Et Cellulaire (IGBMC), Inserm U 1258, CNRS UMR 7104, Université de Strasbourg, Illkirch, France.,Department of Neuropediatrics, Strasbourg University Hospital, Strasbourg, France
| | - Marcela Erro
- Gutierrez Pediatric Hospital, Buenos Aires, Argentina
| | - Maria Saccoliti
- Neuropathology and Neuromuscular Diseases Laboratory, Buenos Aires, Argentina
| | - Osorio Abath Neto
- Institut de Génétique Et de Biologie Moléculaire Et Cellulaire (IGBMC), Inserm U 1258, CNRS UMR 7104, Université de Strasbourg, Illkirch, France
| | - Julien Fauré
- Laboratoire de Biochimie Et Génétique Moléculaire, Pôle de Biologie, CHU Grenoble Alpes, Grenoble, France.,Université Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, Grenoble, France
| | - Béatrice Lannes
- Department of Pathology, Strasbourg University Hospital, Strasbourg, France
| | - Vincent Laugel
- Department of Neuropediatrics, Strasbourg University Hospital, Strasbourg, France
| | - Sandra Coppens
- Center of Human Genetics, Université Libre de Bruxelles, Brussels, Belgium
| | - Fabiana Lubieniecki
- Servucio de Neurología Et Neuropatología, Hospital de Pediatría J.P. Garrahan, Buenos Aires, Argentina
| | - Ana Buj Bello
- Université Paris-Saclay, Integrare Research Unit UMR S951, Inserm, Evry, France.,Généthon, Université Evry, Evry, France
| | - Nigel Laing
- Centre for Medical Research, University of Western Australia, Harry Perkins Institute of Medical Research, Perth, Australia
| | - Teresinha Evangelista
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France.,Sorbonne Université, INSERM, Center for Research in Myology, Myology Institute, APHP, GHU Pitié-Salpêtrière, Paris, France
| | - Jocelyn Laporte
- Institut de Génétique Et de Biologie Moléculaire Et Cellulaire (IGBMC), Inserm U 1258, CNRS UMR 7104, Université de Strasbourg, Illkirch, France
| | - Johann Böhm
- Institut de Génétique Et de Biologie Moléculaire Et Cellulaire (IGBMC), Inserm U 1258, CNRS UMR 7104, Université de Strasbourg, Illkirch, France
| | - Norma B Romero
- Myology Institute, Neuromuscular Morphology Unit, Reference Center of Neuromuscular Diseases Nord-Est-IDF, GHU Pitié-Salpêtrière, Paris, France. .,Sorbonne Université, INSERM, Center for Research in Myology, Myology Institute, APHP, GHU Pitié-Salpêtrière, Paris, France.
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8
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Sagath L, Lehtokari VL, Välipakka S, Vihola A, Gardberg M, Hackman P, Pelin K, Jokela M, Kiiski K, Udd B, Wallgren-Pettersson C. Congenital asymmetric distal myopathy with hemifacial weakness caused by a heterozygous large de novo mosaic deletion in nebulin. Neuromuscul Disord 2021; 31:539-545. [PMID: 33933294 DOI: 10.1016/j.nmd.2021.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 03/10/2021] [Accepted: 03/16/2021] [Indexed: 11/25/2022]
Abstract
We report the first mosaic mutation, a deletion of exons 11-107, identified in the nebulin gene in a Finnish patient presenting with a predominantly distal congenital myopathy and asymmetric muscle weakness. The female patient is ambulant and currently 26 years old. Muscle biopsies showed myopathic features with type 1 fibre predominance, strikingly hypotrophic type 2 fibres and central nuclei, but no nemaline bodies. The deletion was detected in a copy number variation analysis based on next-generation sequencing data. The parents of the patient did not carry the deletion. Mosaicism was detected using a custom, targeted comparative genomic hybridisation array. Expression of the truncated allele, less than half the size of full-length nebulin, was confirmed by Western blotting. The clinical and histological picture resembled that of a family with a slightly smaller deletion, and that in patients with recessively inherited distal forms of nebulin-caused myopathy. Asymmetry, however, was a novel feature.
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Affiliation(s)
- Lydia Sagath
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland.
| | - Vilma-Lotta Lehtokari
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland
| | - Salla Välipakka
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland
| | - Anna Vihola
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland; Neuromuscular Research Centre, Fimlab Laboratories, Tampere University and University Hospital, Tampere, Finland
| | - Maria Gardberg
- Department of Pathology, Turku University Hospital and Institute of Biomedicine, University of Turku, Turku, Finland
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland
| | - Katarina Pelin
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland; Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Manu Jokela
- Division of Clinical Neurosciences, Turku University Hospital and University of Turku, Turku, Finland; Laboratory of Genetics, HUS Diagnostic Centre, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Kirsi Kiiski
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland; Laboratory of Genetics, HUS Diagnostic Centre, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland; Neuromuscular Research Centre, Tampere University and University Hospital, Tampere, Finland; Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
| | - Carina Wallgren-Pettersson
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Finland
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