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Hakibilen C, Delort F, Daher MT, Joanne P, Cabet E, Cardoso O, Bourgois-Rocha F, Tian C, Rivas E, Madruga M, Ferreiro A, Lilienbaum A, Vicart P, Agbulut O, Hénon S, Batonnet-Pichon S. Desmin Modulates Muscle Cell Adhesion and Migration. Front Cell Dev Biol 2022; 10:783724. [PMID: 35350386 PMCID: PMC8957967 DOI: 10.3389/fcell.2022.783724] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 02/09/2022] [Indexed: 12/04/2022] Open
Abstract
Cellular adhesion and migration are key functions that are disrupted in numerous diseases. We report that desmin, a type-III muscle-specific intermediate filament, is a novel cell adhesion regulator. Expression of p.R406W mutant desmin, identified in patients with desmin-related myopathy, modified focal adhesion area and expression of adhesion-signaling genes in myogenic C2C12 cells. Satellite cells extracted from desmin-knock-out (DesKO) and desmin-knock-in-p.R405W (DesKI-R405W) mice were less adhesive and migrated faster than those from wild-type mice. Moreover, we observed mislocalized and aggregated vinculin, a key component of cell adhesion, in DesKO and DesKI-R405W muscles. Vinculin expression was also increased in desmin-related myopathy patient muscles. Together, our results establish a novel role for desmin in cell-matrix adhesion, an essential process for strength transmission, satellite cell migration and muscle regeneration. Our study links the patho-physiological mechanisms of desminopathies to adhesion/migration defects, and may lead to new cellular targets for novel therapeutic approaches.
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Affiliation(s)
| | | | | | - Pierre Joanne
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, INSERM ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Eva Cabet
- Université de Paris, BFA, UMR 8251, CNRS, Paris, France
| | | | | | - Cuixia Tian
- Department of Neurology, Cincinnati Children's Hospital Medical Center, College of Medicine, University of Cincinnati, Cincinnati, OH, United States
| | - Eloy Rivas
- Servicio de Anatomia Patologica, Hospital Universitario Virgen Del Rocio, Sevilla, Spain
| | - Marcos Madruga
- Unidad de Neurologia Pediatrica, Hospital Universitario Virgen Del Rocio, Sevilla, Spain
| | - Ana Ferreiro
- Université de Paris, BFA, UMR 8251, CNRS, Paris, France.,APHP, Centre de Référence Maladies Neuromusculaires Nord/Est/Ile-de-France, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | | | - Patrick Vicart
- Université de Paris, BFA, UMR 8251, CNRS, Paris, France.,Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, INSERM ERL U1164, Biological Adaptation and Ageing, Paris, France.,Université de Paris, MSC, UMR 7067, CNRS, Paris, France.,Department of Neurology, Cincinnati Children's Hospital Medical Center, College of Medicine, University of Cincinnati, Cincinnati, OH, United States.,Servicio de Anatomia Patologica, Hospital Universitario Virgen Del Rocio, Sevilla, Spain.,Unidad de Neurologia Pediatrica, Hospital Universitario Virgen Del Rocio, Sevilla, Spain.,APHP, Centre de Référence Maladies Neuromusculaires Nord/Est/Ile-de-France, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Onnik Agbulut
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, INSERM ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Sylvie Hénon
- Université de Paris, MSC, UMR 7067, CNRS, Paris, France
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Zhang SS, Gu LN, Zhang T, Xu L, Wei X, Chen SH, Shi SJ, Sun DQ, Zhou SH, Zhao QY. Case report: Fatal infantile hypertonic myofibrillar myopathy with compound heterozygous mutations in the CRYAB gene. Front Pediatr 2022; 10:993165. [PMID: 36727013 PMCID: PMC9884804 DOI: 10.3389/fped.2022.993165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 12/09/2022] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Fatal infantile hypertonic myofibrillar myopathy (FIHMM) is an autosomal recessive hereditary disease characterized by amyotrophy, progressive flexion contracture and ankylosis of the trunk and limb muscles, apnea and respiratory failure, and increased creatine phosphate levels. It is caused by mutations in the CRYAB gene, and only around 18 cases including genetic mutations have been reported worldwide. All patients with FIHMM develop respiratory distress, progressive stiffness of the limbs, and have a poor prognosis. However, no effective treatment for CRYAB-associated respiratory failure has been reported. Here, we report a case of FIHMM with a novel heterozygous missense mutation. CASE PRESENTATION A 2-year-old female developed scoliosis of the lumbar spine and restrictive ventilatory dysfunction in infancy. She was admitted to the hospital with labored breathing on the third day after the second injection of inactivated poliomyelitis vaccine. Acute respiratory failure, pneumothorax, and cardiac arrest arose in the patient during hospitalization, and progressive stiffness of the trunk and limb muscles appeared, accompanied by obvious abdominal distension and an increase in phosphocreatine kinase levels. Screenings for genetic metabolic diseases in the blood and urine were normal. Electromyography revealed mild myogenic damage. A muscle biopsy indicated the accumulation of desmin, α-crystallin, and myotilin in the musculus biceps brachii, and dense granules were observed in muscle fibers using electron microscopy. Mutation analysis of CRYAB revealed a novel heterozygous missense mutation in the proband, c.302A > C (p.His101Pro) and c.3G > A (p.Met1Ile), which inherited from her asymptomatic, heterozygous carrier parents, respectively. The proband was finally diagnosed as FIHMM. One month after the FIHMM diagnosis, the child died of respiratory failure. CONCLUSION We report a case of FIHMM with a novel heterozygous missense mutation of CRYAB. This finding might improve our understanding of FIHMM and highlight a novel mutation in the Chinese population.
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Affiliation(s)
- Shan-Shan Zhang
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Li-Niu Gu
- Department of Immunization Planning, Lianyungang Center for Disease Control and revention, Lianyungang, China
| | - Teng Zhang
- Department of Science & Education, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Lu Xu
- Department of Neonatology, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Xiang Wei
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Su-Hong Chen
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Su-Jie Shi
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Da-Quan Sun
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Shao-Hong Zhou
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
| | - Qian-Ye Zhao
- Pediatric Respiratory Ward I, Lianyungang Maternal and Children's Hospital, Lianyungang, China
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Potulska-Chromik A, Jędrzejowska M, Gos M, Rosiak E, Kierdaszuk B, Maruszak A, Opuchlik A, Zekanowski C, Fichna JP. Pathogenic Mutations and Putative Phenotype-Affecting Variants in Polish Myofibrillar Myopathy Patients. J Clin Med 2021; 10:jcm10050914. [PMID: 33652732 PMCID: PMC7956316 DOI: 10.3390/jcm10050914] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/06/2021] [Accepted: 02/17/2021] [Indexed: 02/07/2023] Open
Abstract
Myofibrillar myopathies (MFM) are heterogeneous hereditary muscle diseases with characteristic myopathological features of Z-disk dissolution and aggregates of its degradation products. The onset and progression of the disease are variable, with an elusive genetic background, and around half of the cases lacking molecular diagnosis. Here, we attempted to establish possible genetic foundations of MFM by performing whole exome sequencing (WES) in eleven unrelated families of 13 patients clinically diagnosed as MFM spectrum. A filtering strategy aimed at identification of variants related to the disease was used and included integrative analysis of WES data and human phenotype ontology (HPO) terms, analysis of muscle-expressed genes, and analysis of the disease-associated interactome. Genetic diagnosis was possible in eight out of eleven cases. Putative causative mutations were found in the DES (two cases), CRYAB, TPM3, and SELENON (four cases) genes, the latter typically presenting with a rigid spine syndrome. Moreover, a variety of additional, possibly phenotype-affecting variants were found. These findings indicate a markedly heterogeneous genetic background of MFM and show the usefulness of next generation sequencing in the identification of disease-associated mutations. Finally, we discuss the emerging concept of variant load as the basis of phenotypic heterogeneity.
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Affiliation(s)
- Anna Potulska-Chromik
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097 Warsaw, Poland; (A.P.-C.); (B.K.); (A.O.)
| | - Maria Jędrzejowska
- Neuromuscular Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego St., 02-106 Warsaw, Poland;
| | - Monika Gos
- Department of Medical Genetics, Institute of Mother and Child, 17a Kasprzaka St, 01-211 Warsaw, Poland;
| | - Edyta Rosiak
- II Department of Radiology, Medical University of Warsaw, 1a Banacha St., 02-097 Warsaw, Poland;
| | - Biruta Kierdaszuk
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097 Warsaw, Poland; (A.P.-C.); (B.K.); (A.O.)
| | - Aleksandra Maruszak
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego St., 02-106 Warsaw, Poland; (A.M.); (C.Z.)
| | - Andrzej Opuchlik
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097 Warsaw, Poland; (A.P.-C.); (B.K.); (A.O.)
| | - Cezary Zekanowski
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego St., 02-106 Warsaw, Poland; (A.M.); (C.Z.)
| | - Jakub P. Fichna
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego St., 02-106 Warsaw, Poland; (A.M.); (C.Z.)
- Correspondence: ; Tel.: +48-226-086-485
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Park J, Oh HM, Park HJ, Cho AR, Lee DW, Jang JH, Jang DH. Usefulness of comprehensive targeted multigene panel sequencing for neuromuscular disorders in Korean patients. Mol Genet Genomic Med 2019; 7:e00947. [PMID: 31475473 PMCID: PMC6785438 DOI: 10.1002/mgg3.947] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Revised: 07/22/2019] [Accepted: 08/07/2019] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Multigene panel sequencing (MGPS) is the first-line option in diagnostic testing for genetically heterogeneous but clinically similar conditions, such as neuromuscular disorders (NMDs). In this study, we aimed to assess the utility of comprehensive NMD MGPS and the need for updated panels. METHODS All patients were analyzed by either of two versions of the NMD MGPS and by chromosomal microarray and karyotype testing. Four patients with negative NMD MGPS results underwent whole exome sequencing. RESULTS In total, 91 patients were enrolled, and a genetic diagnosis was made in 36 (39.6%); of these, 33 were diagnosed by the comprehensive NMD MGPS, two were confirmed by chromosomal microarray, and one was diagnosed by whole exome sequencing. For MGPS, the diagnostic yield of Version 2 (19/52; 36.5%) was a little higher than that of Version 1 (14/39; 35.9%), and one gene identified in Version 2 was not included in Version 1. A total of 36 definitive and nine possible causative variants were identified, of which 17 were novel. CONCLUSION A more comprehensive panel for NMD MGPS can improve the diagnostic efficiency in genetic testing. The rapid discovery of new disease-causing genes over recent years necessitates updates to existing gene panels.
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Affiliation(s)
- Jihye Park
- Department of Rehabilitation Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hyun Mi Oh
- Department of Rehabilitation Medicine, National Traffic Injury Rehabilitation Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Hye Jung Park
- Department of Rehabilitation Medicine, National Traffic Injury Rehabilitation Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ah-Ra Cho
- Department of Rehabilitation Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Dong-Woo Lee
- Department of Rehabilitation Medicine, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | | | - Dae-Hyun Jang
- Department of Rehabilitation Medicine, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Recessive DES cardio/myopathy without myofibrillar aggregates: intronic splice variant silences one allele leaving only missense L190P-desmin. Eur J Hum Genet 2019; 27:1267-1273. [PMID: 31024060 DOI: 10.1038/s41431-019-0393-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 03/04/2019] [Accepted: 03/19/2019] [Indexed: 01/08/2023] Open
Abstract
We establish autosomal recessive DES variants p.(Leu190Pro) and a deep intronic splice variant causing inclusion of a frameshift-inducing artificial exon/intronic fragment, as the likely cause of myopathy with cardiac involvement in female siblings. Both sisters presented in their twenties with slowly progressive limb girdle weakness, severe systolic dysfunction, and progressive, severe respiratory weakness. Desmin is an intermediate filament protein typically associated with autosomal dominant myofibrillar myopathy with cardiac involvement. However a few rare cases of autosomal recessive desminopathy are reported. In this family, a paternal missense p.(Leu190Pro) variant was viewed unlikely to be causative of autosomal dominant desminopathy, as the father and brothers carrying this variant were clinically unaffected. Clinical fit with a DES-related myopathy encouraged closer scrutiny of all DES variants, identifying a maternal deep intronic variant within intron-7, predicted to create a cryptic splice site, which segregated with disease. RNA sequencing and studies of muscle cDNA confirmed the deep intronic variant caused aberrant splicing of an artificial exon/intronic fragment into maternal DES mRNA transcripts, encoding a premature termination codon, and potently activating nonsense-mediate decay (92% paternal DES transcripts, 8% maternal). Western blot showed 60-75% reduction in desmin levels, likely comprised only of missense p.(Leu190Pro) desmin. Biopsy showed fibre size variation with increased central nuclei. Electron microscopy showed extensive myofibrillar disarray, duplication of the basal lamina, but no inclusions or aggregates. This study expands the phenotypic spectrum of recessive DES cardio/myopathy, and emphasizes the continuing importance of muscle biopsy for functional genomics pursuit of 'tricky' variants in neuromuscular conditions.
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Fichna JP, Maruszak A, Żekanowski C. Myofibrillar myopathy in the genomic context. J Appl Genet 2018; 59:431-439. [PMID: 30203143 DOI: 10.1007/s13353-018-0463-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 08/30/2018] [Indexed: 12/31/2022]
Abstract
Myofibrillar myopathy (MFM) is a group of inherited muscular disorders characterized by myofibril dissolution and abnormal accumulation of degradation products. The diagnosis of muscular disorders based on clinical presentation is difficult due to phenotypic heterogeneity and overlapping symptoms. In addition, precise diagnosis does not always explain the disease etiopathology or the highly variable clinical course even among patients diagnosed with the same type of myopathy. The advent of high-throughput next-generation sequencing (NGS) has provided a successful and cost-effective strategy for identification of novel causative genes in myopathies, including MFM. So far, pathogenic mutations associated with MFM phenotype, including atypical MFM-like cases, have been identified in 17 genes: DES, CRYAB, MYOT, ZASP, FLNC, BAG3, FHL1, TTN, DNAJB6, PLEC, LMNA, ACTA1, HSPB8, KY, PYROXD1, and SQSTM + TIA1 (digenic). Most of these genes are also associated with other forms of muscle diseases. In addition, in many MFM patients, numerous genomic variants in muscle-related genes have been identified. The various myopathies and muscular dystrophies seem to form a single disease continuum; therefore, gene identification in one disease impacts the genetic etiology of the others. In this review, we describe the heterogeneity of the MFM genetic background focusing on the role of rare variants, the importance of whole genome sequencing in the identification of novel disease-associated mutations, and the emerging concept of variant load as the basis of the phenotypic heterogeneity.
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Affiliation(s)
- Jakub Piotr Fichna
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego St., 02-106, Warsaw, Poland.
| | - Aleksandra Maruszak
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego St., 02-106, Warsaw, Poland
| | - Cezary Żekanowski
- Department of Neurodegenerative Disorders, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawinskiego St., 02-106, Warsaw, Poland
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7
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Piesanen J, Kunnas T, Nikkari ST. Association of Desmin Gene Variant rs1058261 with Cardiovascular Disease, the TAMRISK Study. Genet Test Mol Biomarkers 2018; 22:574-576. [PMID: 30096250 DOI: 10.1089/gtmb.2018.0118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
AIMS Since desmin expression is diminished in vascular smooth muscle cells during reparative processes, we wanted to study whether a common intragenic single nucleotide polymorphism at nucleotide position 828 (rs1058261) of the DES gene associates with hypertension, cerebrovascular complications, and all cardiovascular events in the Tampere adult population cardiovascular risk (TAMRISK) study. MATERIALS AND METHODS A Finnish periodic health examination cohort of 336 subjects with diagnosed hypertension and 473 controls were analyzed. Samples were genotyped for polymorphism using TaqMan techniques. Prevalence of ischemic heart diseases, incidence of cerebrovascular diseases, and transient cerebral ischemic attacks (TIAs) were obtained by self-report and the National Hospital Discharge Registry (HILMO). RESULTS There was no association of any of the rs1058261 genotypes with hypertension at the age of 50. When the subjects were followed to the age of 60, after adjustment for gender and body mass index, subjects with the genotype CC had higher incidence of cerebrovascular events (cerebrovascular diseases and TIA) (4.1%) compared with the T allele (1.6%) (p = 0.046). In addition, those with CC genotype had a higher incidence of all combined cardiovascular events (12.8%) compared with subjects with the T allele (8.5%) (p = 0.028). CONCLUSIONS Our findings suggest that variations in the DES gene may be involved in cardiovascular disease.
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Affiliation(s)
- Jaakko Piesanen
- Department of Medical Biochemistry, Faculty of Medicine and Life Sciences, University of Tampere and Fimlab Laboratories , Tampere, Finland
| | - Tarja Kunnas
- Department of Medical Biochemistry, Faculty of Medicine and Life Sciences, University of Tampere and Fimlab Laboratories , Tampere, Finland
| | - Seppo T Nikkari
- Department of Medical Biochemistry, Faculty of Medicine and Life Sciences, University of Tampere and Fimlab Laboratories , Tampere, Finland
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8
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Brodehl A, Gaertner-Rommel A, Milting H. Molecular insights into cardiomyopathies associated with desmin (DES) mutations. Biophys Rev 2018; 10:983-1006. [PMID: 29926427 DOI: 10.1007/s12551-018-0429-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/22/2018] [Indexed: 12/15/2022] Open
Abstract
Increasing usage of next-generation sequencing techniques pushed during the last decade cardiogenetic diagnostics leading to the identification of a huge number of genetic variants in about 170 genes associated with cardiomyopathies, channelopathies, or syndromes with cardiac involvement. Because of the biochemical and cellular complexity, it is challenging to understand the clinical meaning or even the relevant pathomechanisms of the majority of genetic sequence variants. However, detailed knowledge about the associated molecular pathomechanism is essential for the development of efficient therapeutic strategies in future and genetic counseling. Mutations in DES, encoding the muscle-specific intermediate filament protein desmin, have been identified in different kinds of cardiac and skeletal myopathies. Here, we review the functions of desmin in health and disease with a focus on cardiomyopathies. In addition, we will summarize the genetic and clinical literature about DES mutations and will explain relevant cell and animal models. Moreover, we discuss upcoming perspectives and consequences of novel experimental approaches like genome editing technology, which might open a novel research field contributing to the development of efficient and mutation-specific treatment options.
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Affiliation(s)
- Andreas Brodehl
- Erich and Hanna Klessmann Institute for Cardiovascular Research & Development, Heart and Diabetes Centre NRW, Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany.
| | - Anna Gaertner-Rommel
- Erich and Hanna Klessmann Institute for Cardiovascular Research & Development, Heart and Diabetes Centre NRW, Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany
| | - Hendrik Milting
- Erich and Hanna Klessmann Institute for Cardiovascular Research & Development, Heart and Diabetes Centre NRW, Ruhr-University Bochum, Georgstrasse 11, 32545, Bad Oeynhausen, Germany.
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Early signs of architectural and biomechanical failure in isolated myofibers and immortalized myoblasts from desmin-mutant knock-in mice. Sci Rep 2017; 7:1391. [PMID: 28469177 PMCID: PMC5431221 DOI: 10.1038/s41598-017-01485-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 03/29/2017] [Indexed: 01/25/2023] Open
Abstract
In striated muscle, desmin intermediate filaments interlink the contractile myofibrillar apparatus with mitochondria, nuclei, and the sarcolemma. The desmin network’s pivotal role in myocytes is evident since mutations in the human desmin gene cause severe myopathies and cardiomyopathies. Here, we investigated skeletal muscle pathology in myofibers and myofibrils isolated from young hetero- and homozygous R349P desmin knock-in mice, which carry the orthologue of the most frequent human desmin missense mutation R350P. We demonstrate that mutant desmin alters myofibrillar cytoarchitecture, markedly disrupts the lateral sarcomere lattice and distorts myofibrillar angular axial orientation. Biomechanical assessment revealed a high predisposition to stretch-induced damage in fiber bundles of R349P mice. Notably, Ca2+-sensitivity and passive myofibrillar tension were decreased in heterozygous fiber bundles, but increased in homozygous fiber bundles compared to wildtype mice. In a parallel approach, we generated and subsequently subjected immortalized heterozygous R349P desmin knock-in myoblasts to magnetic tweezer experiments that revealed a significantly increased sarcolemmal lateral stiffness. Our data suggest that mutated desmin already markedly impedes myocyte structure and function at pre-symptomatic stages of myofibrillar myopathies.
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10
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Nojszewska M, Gawel M, Szmidt-Salkowska E, Kostera-Pruszczyk A, Potulska-Chromik A, Lusakowska A, Kierdaszuk B, Lipowska M, Macias A, Gawel D, Seroka A, Kaminska AM. Abnormal spontaneous activity in primary myopathic disorders. Muscle Nerve 2016; 56:427-432. [PMID: 28000226 DOI: 10.1002/mus.25521] [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] [Received: 03/31/2016] [Revised: 12/08/2016] [Accepted: 12/14/2016] [Indexed: 12/26/2022]
Abstract
INTRODUCTION Reproducible non-insertional spontaneous activity (SA), with the exception of endplate activity, is an unequivocal sign of abnormality and is one of the most useful findings obtained on electromyography. METHODS In this retrospective study we analyzed occurrence and distribution of abnormal SA in 151 patients with genetically confirmed myopathies. RESULTS Complex repetitive discharges (CRDs) occurred more frequently than fibrillation potentials (fibs) and positive sharp waves (PSWs) in centronuclear myopathy (CNM) and limb-girdle muscular dystrophy type 2A (LGMD-2A), whereas fibs/PSWs were observed more often in desminopathy and facioscapulohumeral dystrophy (FSHD). Abnormal SA was commonly found in CNM (66.7%) and desminopathy (61.5%), occasionally in Duchenne (DMD) and Becker muscular dystrophy (BMD) (45.2% and 27.6%, respectively), but rarely in FSHD (14.9%) and LGMD-2A (12.0%). CONCLUSIONS Abnormal SA probably occurs more frequently in disorders associated with structural changes in muscle fibers. Screening for SA may be a valuable tool for diagnosis of non-myotonic myopathies. Muscle Nerve 56: 427-432, 2017.
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Affiliation(s)
- Monika Nojszewska
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Malgorzata Gawel
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | | | | | | | - Anna Lusakowska
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Biruta Kierdaszuk
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Marta Lipowska
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Anna Macias
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Damian Gawel
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, Marymoncka Strasse 99/103, 01-813, Warsaw, Poland
| | - Andrzej Seroka
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
| | - Anna M Kaminska
- Department of Neurology, Medical University of Warsaw, Warsaw, Poland
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Kostera-Pruszczyk A, Suszek M, Płoski R, Franaszczyk M, Potulska-Chromik A, Pruszczyk P, Sadurska E, Karolczak J, Kamińska AM, Rędowicz MJ. BAG3-related myopathy, polyneuropathy and cardiomyopathy with long QT syndrome. J Muscle Res Cell Motil 2015; 36:423-32. [PMID: 26545904 PMCID: PMC4762926 DOI: 10.1007/s10974-015-9431-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Accepted: 10/28/2015] [Indexed: 12/14/2022]
Abstract
BAG3 belongs to BAG family of molecular chaperone regulators interacting with HSP70 and anti-apoptotic protein Bcl-2. It is ubiquitously expressed with strong expression in skeletal and cardiac muscle, and is involved in a panoply of cellular processes. Mutations in BAG3 and aberrations in its expression cause fulminant myopathies, presenting with progressive limb and axial muscle weakness, and respiratory insufficiency and neuropathy. Herein, we report a sporadic case of a 15-years old girl with symptoms of myopathy, demyelinating polyneuropathy and asymptomatic long QT syndrome. Genetic testing demonstrated heterozygous mutation Pro209Leu (c.626C > T) in exon 3 of BAG3 gene causing severe myopathy and neuropathy, often associated with restrictive cardiomyopathy. We did not find a mutation in any known LQT syndrome genes. Analysis of muscle biopsy revealed profound disintegration of Z-discs with extensive accumulation of granular debris and large inclusions within fibers. We demonstrated profound alterations in BAG3 distribution as the protein localized to long filamentous structures present across the fibers that were positively stained not only for α-actinin but also for desmin and filamin indicating that those disintegrated Z-disc regions contained also other sarcomeric proteins. The mutation caused a decrease in the content of BAG3 and HSP70, and also of α-actinin desmin, filamin and fast myosin heavy chain, confirming its severe effect on the muscle fiber morphology and thus function. We provide further evidence that BAG3 is associated with Z-disc maintenance, and the Pro209Leu mutation may occur worldwide. We also provide a summary of cases associated with this mutation reported so far.
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Affiliation(s)
- Anna Kostera-Pruszczyk
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Małgorzata Suszek
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland
| | - Rafał Płoski
- Department of Medical Genetics, Medical University of Warsaw, 3c Pawińskiego St., 02-106, Warsaw, Poland
| | - Maria Franaszczyk
- Laboratory of Molecular Biology, Institute of Cardiology, 42 Alpejska St., 04-628, Warsaw, Poland
| | - Anna Potulska-Chromik
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Piotr Pruszczyk
- Department of Internal Medicine and Cardiology with the Center for Diagnosis and Treatment of Venous Thromboembolism, Medical University of Warsaw, 4 Lindleya St., 02-005, Warsaw, Poland
| | - Elżbieta Sadurska
- Department of Pediatric Cardiology, Medical University of Lublin, Chodźki 2, 20-093, Lublin, Poland
| | - Justyna Karolczak
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland
| | - Anna M Kamińska
- Department of Neurology, Medical University of Warsaw, 1a Banacha St., 02-097, Warsaw, Poland
| | - Maria Jolanta Rędowicz
- Department of Biochemistry, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093, Warsaw, Poland.
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