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Buvoli M, Wilson GC, Buvoli A, Gugel JF, Hau A, Bönnemann CG, Paradas C, Ryba DM, Woulfe KC, Walker LA, Buvoli T, Ochala J, Leinwand LA. A Laing distal myopathy-associated proline substitution in the β-myosin rod perturbs myosin cross-bridging activity. J Clin Invest 2024; 134:e172599. [PMID: 38690726 PMCID: PMC11060730 DOI: 10.1172/jci172599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 03/11/2024] [Indexed: 05/03/2024] Open
Abstract
Proline substitutions within the coiled-coil rod region of the β-myosin gene (MYH7) are the predominant mutations causing Laing distal myopathy (MPD1), an autosomal dominant disorder characterized by progressive weakness of distal/proximal muscles. We report that the MDP1 mutation R1500P, studied in what we believe to be the first mouse model for the disease, adversely affected myosin motor activity despite being in the structural rod domain that directs thick filament assembly. Contractility experiments carried out on isolated mutant muscles, myofibrils, and myofibers identified muscle fatigue and weakness phenotypes, an increased rate of actin-myosin detachment, and a conformational shift of the myosin heads toward the more reactive disordered relaxed (DRX) state, causing hypercontractility and greater ATP consumption. Similarly, molecular analysis of muscle biopsies from patients with MPD1 revealed a significant increase in sarcomeric DRX content, as observed in a subset of myosin motor domain mutations causing hypertrophic cardiomyopathy. Finally, oral administration of MYK-581, a small molecule that decreases the population of heads in the DRX configuration, significantly improved the limited running capacity of the R1500P-transgenic mice and corrected the increased DRX state of the myofibrils from patients. These studies provide evidence of the molecular pathogenesis of proline rod mutations and lay the groundwork for the therapeutic advancement of myosin modulators.
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Affiliation(s)
- Massimo Buvoli
- Department of Molecular, Cellular and Developmental Biology, and
- BioFrontiers Institute, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Genevieve C.K. Wilson
- Department of Molecular, Cellular and Developmental Biology, and
- BioFrontiers Institute, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Ada Buvoli
- Department of Molecular, Cellular and Developmental Biology, and
- BioFrontiers Institute, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Jack F. Gugel
- Department of Molecular, Cellular and Developmental Biology, and
- BioFrontiers Institute, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado, USA
| | - Abbi Hau
- Centre of Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, and
- Randall Centre for Cell and Molecular Biophysics, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, Guy’s Campus, King’s College London, London, United Kingdom
| | - Carsten G. Bönnemann
- Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institute of Neurological Disorders and Stroke (NINDS), NIH, Bethesda, Maryland, USA
| | - Carmen Paradas
- Neuromuscular Unit, Department of Neurology, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain
| | | | - Kathleen C. Woulfe
- Division of Cardiology, Department of Medicine, University of Colorado, Denver, Colorado, USA
| | - Lori A. Walker
- Division of Cardiology, Department of Medicine, University of Colorado, Denver, Colorado, USA
| | - Tommaso Buvoli
- Department of Mathematics, Tulane University, New Orleans, Louisiana, USA
| | - Julien Ochala
- Centre of Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, and
- Randall Centre for Cell and Molecular Biophysics, School of Basic and Medical Biosciences, Faculty of Life Sciences and Medicine, Guy’s Campus, King’s College London, London, United Kingdom
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Leslie A. Leinwand
- Department of Molecular, Cellular and Developmental Biology, and
- BioFrontiers Institute, Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado, USA
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2
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Ghaedi H, Davey SK, Feilotter H. Variant Classification Discordance: Contributing Factors and Predictive Models. J Mol Diagn 2024; 26:115-126. [PMID: 38008287 DOI: 10.1016/j.jmoldx.2023.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/04/2023] [Accepted: 11/07/2023] [Indexed: 11/28/2023] Open
Abstract
An ever-growing catalog of human variants is hosted in the ClinVar database. In this database, submissions on a variant are combined into a multisubmitter record; and in the case of discordance in variant classification between submitters, the record is labeled as conflicting. The current study used ClinVar data to identify characteristics that would make variants more likely to be associated with the conflict class of variants. Furthermore, the Extreme Gradient Boosting algorithm was used to train classifier models to provide prediction of classification discordance for single submission variants in ClinVar database. Population allele frequency, the gene harboring the variant, variant type, consequence on protein, variant deleteriousness score, first submitter identity, and submission count were associated with conflict in variant classification. Using such features, the optimized classifier showed accuracy on the test set of 88% with the weighted average of precision, recall, and f1-score of 0.84, 0.88, and 0.85, respectively. There were pronounced associations between variant classification discordance and allele frequency, gene type, and the identity of the first submitter. The study provides the predicted discordance status for single-submitter variants deposited in ClinVar. This approach can be used to assess whether single-submitter variants are likely to be supported, or in conflict with, future entries; this knowledge may help laboratories with clinical variant assessment.
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Affiliation(s)
- Hamid Ghaedi
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada
| | - Scott K Davey
- Division of Cancer Biology and Genetics, Department of Pathology and Molecular Medicine, Queen's University Cancer Research Institute, Kingston, Ontario, Canada
| | - Harriet Feilotter
- Department of Pathology and Molecular Medicine, Queen's University, Kingston, Ontario, Canada.
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3
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Gao Y, Peng L, Zhao C. MYH7 in cardiomyopathy and skeletal muscle myopathy. Mol Cell Biochem 2024; 479:393-417. [PMID: 37079208 DOI: 10.1007/s11010-023-04735-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 04/07/2023] [Indexed: 04/21/2023]
Abstract
Myosin heavy chain gene 7 (MYH7), a sarcomeric gene encoding the myosin heavy chain (myosin-7), has attracted considerable interest as a result of its fundamental functions in cardiac and skeletal muscle contraction and numerous nucleotide variations of MYH7 are closely related to cardiomyopathy and skeletal muscle myopathy. These disorders display significantly inter- and intra-familial variability, sometimes developing complex phenotypes, including both cardiomyopathy and skeletal myopathy. Here, we review the current understanding on MYH7 with the aim to better clarify how mutations in MYH7 affect the structure and physiologic function of sarcomere, thus resulting in cardiomyopathy and skeletal muscle myopathy. Importantly, the latest advances on diagnosis, research models in vivo and in vitro and therapy for precise clinical application have made great progress and have epoch-making significance. All the great advance is discussed here.
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Affiliation(s)
- Yuan Gao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China
| | - Lu Peng
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China
| | - Cuifen Zhao
- Department of Pediatrics, Qilu Hospital of Shandong University, Jinan, 250012, China.
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4
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Weterman MAJ, Bronk M, Jongejan A, Hoogendijk JE, Krudde J, Karjosukarso D, Goebel HH, Aronica E, Jöbsis GJ, van Ruissen F, van Spaendonck-Zwarts KY, de Visser M, Baas F. Pathogenic variants in three families with distal muscle involvement. Neuromuscul Disord 2023; 33:58-64. [PMID: 36539320 DOI: 10.1016/j.nmd.2022.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 11/23/2022] [Accepted: 11/28/2022] [Indexed: 12/02/2022]
Abstract
Three families suspected of distal hereditary motor neuropathy underwent genetic screening with the aim to identify the molecular defect underlying the disease. The description of the identification reflects the shift in molecular diagnostics that was made during the last decades. Our candidate gene approach yielded a known pathogenic variant in BSCL2 (p.Asn88Ser) in one family, and via a CMT-capture, in HSPB1 (p.Arg127Trp), in addition to five other variations in Charcot-Marie-Tooth-related genes in the proband of the second family. In the third family, using whole exome sequencing, followed by linkage-by-location, a three base pair deletion in exon 33 of MYH7 (p.Glu1508del) was found, a reported pathogenic allele albeit for a myopathy. After identification of the causative molecular defect, cardiac examination was performed for patients of the third family and this demonstrated abnormalities in three out of five affected family members. Heterogeneity and expansion of clinical phenotypes beyond known characteristics requires a wider set of genes to be screened. Whole exome/genome analysis with limited prior clinical information may therefore be used to precede a detailed clinical evaluation in cases of large families, preventing screening of a too narrow set of genes, and enabling the identification of novel disease-associated genes. In our cases, the variants had been reported, and co-segregation analysis confirmed the molecular diagnosis.
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Affiliation(s)
- Marian A J Weterman
- Department of Genome Analysis/Clinical Genetics, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands; Dept Clinical Genetics, LUMC, Leiden, the Netherlands.
| | - Marieke Bronk
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Aldo Jongejan
- Department of Bio-informatics, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Jessica E Hoogendijk
- Department of Neurology, UMC Brain Center, University Medical Center, Utrecht, the Netherlands
| | - Judith Krudde
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Dyah Karjosukarso
- Department of Genome Analysis/Clinical Genetics, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands
| | - Hans H Goebel
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Eleonora Aronica
- Department of Pathology, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands
| | - G Joost Jöbsis
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Fred van Ruissen
- Department of Genome Analysis/Clinical Genetics, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands; Department of Human Genetics, Amsterdam Reproduction and Development Research Institute, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Karin Y van Spaendonck-Zwarts
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Marianne de Visser
- Department of Neurology, University Medical Center Amsterdam, location Academic Medical Center, Amsterdam, the Netherlands
| | - Frank Baas
- Department of Genome Analysis/Clinical Genetics, Amsterdam University Medical Center, Location Academic Medical Center, Amsterdam, the Netherlands; Dept Clinical Genetics, LUMC, Leiden, the Netherlands
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Rossi D, Catallo MR, Pierantozzi E, Sorrentino V. Mutations in proteins involved in E-C coupling and SOCE and congenital myopathies. J Gen Physiol 2022; 154:213407. [PMID: 35980353 PMCID: PMC9391951 DOI: 10.1085/jgp.202213115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 11/24/2022] Open
Abstract
In skeletal muscle, Ca2+ necessary for muscle contraction is stored and released from the sarcoplasmic reticulum (SR), a specialized form of endoplasmic reticulum through the mechanism known as excitation–contraction (E-C) coupling. Following activation of skeletal muscle contraction by the E-C coupling mechanism, replenishment of intracellular stores requires reuptake of cytosolic Ca2+ into the SR by the activity of SR Ca2+-ATPases, but also Ca2+ entry from the extracellular space, through a mechanism called store-operated calcium entry (SOCE). The fine orchestration of these processes requires several proteins, including Ca2+ channels, Ca2+ sensors, and Ca2+ buffers, as well as the active involvement of mitochondria. Mutations in genes coding for proteins participating in E-C coupling and SOCE are causative of several myopathies characterized by a wide spectrum of clinical phenotypes, a variety of histological features, and alterations in intracellular Ca2+ balance. This review summarizes current knowledge on these myopathies and discusses available knowledge on the pathogenic mechanisms of disease.
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Affiliation(s)
- Daniela Rossi
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy.,Interdepartmental Program of Molecular Diagnosis and Pathogenetic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy
| | - Maria Rosaria Catallo
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - Enrico Pierantozzi
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - Vincenzo Sorrentino
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy.,Interdepartmental Program of Molecular Diagnosis and Pathogenetic Mechanisms of Rare Genetic Diseases, Azienda Ospedaliero Universitaria Senese, Siena, Italy
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6
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Rhee S, Paik DT, Yang JY, Nagelberg D, Williams I, Tian L, Roth R, Chandy M, Ban J, Belbachir N, Kim S, Zhang H, Phansalkar R, Wong KM, King DA, Valdez C, Winn VD, Morrison AJ, Wu JC, Red-Horse K. Endocardial/endothelial angiocrines regulate cardiomyocyte development and maturation and induce features of ventricular non-compaction. Eur Heart J 2021; 42:4264-4276. [PMID: 34279605 PMCID: PMC8560211 DOI: 10.1093/eurheartj/ehab298] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 04/21/2021] [Accepted: 05/15/2021] [Indexed: 12/15/2022] Open
Abstract
AIMS Non-compaction cardiomyopathy is a devastating genetic disease caused by insufficient consolidation of ventricular wall muscle that can result in inadequate cardiac performance. Despite being the third most common cardiomyopathy, the mechanisms underlying the disease, including the cell types involved, are poorly understood. We have previously shown that endothelial cell-specific deletion of the chromatin remodeller gene Ino80 results in defective coronary vessel development that leads to ventricular non-compaction in embryonic mouse hearts. We aimed to identify candidate angiocrines expressed by endocardial and endothelial cells (ECs) in wildtype and LVNC conditions in Tie2Cre;Ino80fl/fltransgenic embryonic mouse hearts, and test the effect of these candidates on cardiomyocyte proliferation and maturation. METHODS AND RESULTS We used single-cell RNA-sequencing to characterize endothelial and endocardial defects in Ino80-deficient hearts. We observed a pathological endocardial cell population in the non-compacted hearts and identified multiple dysregulated angiocrine factors that dramatically affected cardiomyocyte behaviour. We identified Col15a1 as a coronary vessel-secreted angiocrine factor, downregulated by Ino80-deficiency, that functioned to promote cardiomyocyte proliferation. Furthermore, mutant endocardial and endothelial cells up-regulated expression of secreted factors, such as Tgfbi, Igfbp3, Isg15, and Adm, which decreased cardiomyocyte proliferation and increased maturation. CONCLUSIONS These findings support a model where coronary endothelial cells normally promote myocardial compaction through secreted factors, but that endocardial and endothelial cells can secrete factors that contribute to non-compaction under pathological conditions.
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Affiliation(s)
- Siyeon Rhee
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - David T Paik
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Johnson Y Yang
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | | | - Ian Williams
- Department of Biology, Stanford University, Stanford, CA 94305, USA
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Lei Tian
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Robert Roth
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Mark Chandy
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Jiyeon Ban
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Nadjet Belbachir
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Seokho Kim
- Department of Developmental Biology, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Hao Zhang
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Ragini Phansalkar
- Department of Genetics, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Ka Man Wong
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Devin A King
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Caroline Valdez
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Virginia D Winn
- Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA
| | - Ashby J Morrison
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Joseph C Wu
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford University, Stanford, CA, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Kristy Red-Horse
- Department of Biology, Stanford University, Stanford, CA 94305, USA
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA
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Ogasawara M, Nishino I. A review of core myopathy: central core disease, multiminicore disease, dusty core disease, and core-rod myopathy. Neuromuscul Disord 2021; 31:968-977. [PMID: 34627702 DOI: 10.1016/j.nmd.2021.08.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/13/2021] [Accepted: 08/16/2021] [Indexed: 12/21/2022]
Abstract
Core myopathies are clinically, pathologically, and genetically heterogeneous muscle diseases. Their onset and clinical severity are variable. Core myopathies are diagnosed by muscle biopsy showing focally reduced oxidative enzyme activity and can be pathologically divided into central core disease, multiminicore disease, dusty core disease, and core-rod myopathy. Although RYR1-related myopathy is the most common core myopathy, an increasing number of other causative genes have been reported, including SELENON, MYH2, MYH7, TTN, CCDC78, UNC45B, ACTN2, MEGF10, CFL2, KBTBD13, and TRIP4. Furthermore, the genes originally reported to cause nemaline myopathy, namely ACTA1, NEB, and TNNT1, have been recently associated with core-rod myopathy. Genetic analysis allows us to diagnose each core myopathy more accurately. In this review, we aim to provide up-to-date information about core myopathies.
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Affiliation(s)
- Masashi Ogasawara
- Department of Neuromuscular Research, National Center of Neurology and Psychiatry (NCNP), National Institute of Neuroscience, 4-1-1 Ogawahigashi, Tokyo 187-8502, Japan; Medical Genome Center, NCNP, Tokyo, Kodaira, Japan; Department of Pediatrics, Showa General Hospital, Tokyo, Kodaira, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Center of Neurology and Psychiatry (NCNP), National Institute of Neuroscience, 4-1-1 Ogawahigashi, Tokyo 187-8502, Japan; Medical Genome Center, NCNP, Tokyo, Kodaira, Japan.
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8
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Abstract
PURPOSE OF REVIEW Tremor is a common neurological symptom with a plethora of potential etiologies. Apart from physiological tremor, the vast majority of tremor syndromes are linked to a pacemaker in the central nervous system (CNS) or, less common, in the peripheral nervous system. Myogenic tremor is a novel tremor entity, first reported in 2019 and believed to originate in the muscle itself. In this review, we describe the clinical properties of myogenic tremor and discuss its presumed pathogenesis on the basis of all of the patient cases published so far. RECENT FINDINGS Myogenic tremor manifests itself as a high frequency, postural, and kinetic tremor with onset in infancy. To date, only myopathies affecting the contractile elements, in particular myosin and a myosin-associated protein, have been recognized to feature myogenic tremor. The generator of the tremor is believed to be located in the sarcomere, with propagation and amplification of sarcomeric oscillatory activity through CNS reflex loops, similar to neuropathic tremor. SUMMARY True myogenic tremor must be distinguished from centrally mediated tremor due to myopathies with central nervous system involvement, i.e., mitochondrial myopathies or myotonic dystrophies. The presence of myogenic tremor strongly points toward a sarcomere-associated mutation and may thus be a valuable clinical tool for the differential diagnosis of myopathies.
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Atemin S, Todorov T, Maver A, Chamova T, Georgieva B, Tincheva S, Pacheva I, Ivanov I, Taneva A, Zlatareva D, Tournev I, Guergueltcheva V, Gospodinova M, Chochkova L, Peterlin B, Mitev V, Todorova A. MYH7-related disorders in two Bulgarian families: Novel variants in the same region associated with different clinical manifestation and disease penetrance. Neuromuscul Disord 2021; 31:633-641. [PMID: 34053846 DOI: 10.1016/j.nmd.2021.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 04/04/2021] [Accepted: 04/19/2021] [Indexed: 11/17/2022]
Abstract
Pathogenic variants in MYH7 cause a wide range of cardiac and skeletal muscle diseases with childhood or adult onset. These include dilated and/or hypertrophic cardiomyopathy, left ventricular non-compaction cardiomyopathy, congenital myopathies with multi-minicores and myofiber type disproportion, myosin storage myopathy, Laing distal myopathy and others (scapulo-peroneal or limb-girdle muscle forms). Here we report the results from molecular genetic analyses (NGS and Sanger sequencing) of 4 patients in two families with variable neuromuscular phenotypes with or without cardiac involvement. Interestingly, variants in MYH7 gene appeared to be the cause in all the cases. A novel nonsense variant c.5746C>T, p.(Gln1916Ter) was found in the patient in Family 1 who deceased at the age of 2 years 4 months with the clinical diagnosis of dilated cardiomyopathy, whose father died before the age of 40 years, due to cardiac failure with clinical diagnosis of suspected limb-girdle muscular dystrophy. A splice acceptor variant c.5560-2A>C in MYH7 was detected in the second proband and her sister, with late onset distal myopathy without cardiac involvement. These different phenotypes (muscular involvement with severe cardiomyopathy and pure late onset neuromuscular phenotype without heart involvement) may result from novel MYH7 variants, which most probably impact the LMM (light meromyosin) domain's function of the mature protein.
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Affiliation(s)
- Slavena Atemin
- Department of Medical Chemistry and Biochemistry, Medical University Sofia, Sofia, Bulgaria; Genetic Medico-Diagnostic Laboratory "Genica", Sofia, Bulgaria.
| | - Tihomir Todorov
- Genetic Medico-Diagnostic Laboratory "Genica", Sofia, Bulgaria
| | - Ales Maver
- Clinical Institute of Medical Genetics, UMC Ljubljana, Šlajmerjeva 4, SI-1000 Ljubljana, Slovenia
| | - Teodora Chamova
- Department of Neurology, University hospital "Alexandrovska", Medical University Sofia, Sofia, Bulgaria
| | - Bilyana Georgieva
- Department of Medical Chemistry and Biochemistry, Medical University Sofia, Sofia, Bulgaria
| | - Savina Tincheva
- Genetic Medico-Diagnostic Laboratory "Genica", Sofia, Bulgaria
| | - Iliyana Pacheva
- Department of Pediatrics and Medical Genetics, Medical University - Plovdiv, Bulgaria; Department of Pediatrics, University Hospital "St. George", Plovdiv, Bulgaria
| | - Ivan Ivanov
- Department of Pediatrics and Medical Genetics, Medical University - Plovdiv, Bulgaria; Department of Pediatrics, University Hospital "St. George", Plovdiv, Bulgaria
| | - Ani Taneva
- Department of Neurology, University hospital "Alexandrovska", Medical University Sofia, Sofia, Bulgaria
| | - Dora Zlatareva
- Department of Diagnostic Imaging, University Hospital "Alexandrovska", Medical University, Sofia, Bulgaria
| | - Ivailo Tournev
- Department of Neurology, University hospital "Alexandrovska", Medical University Sofia, Sofia, Bulgaria; Department of Cognitive Science and Psychology, New Bulgarian University, Sofia, Bulgaria
| | | | | | - Lyubov Chochkova
- Department of Pediatrics and Medical Genetics, Medical University - Plovdiv, Bulgaria; Department of Pediatrics, University Hospital "St. George", Plovdiv, Bulgaria
| | - Borut Peterlin
- Clinical Institute of Medical Genetics, UMC Ljubljana, Šlajmerjeva 4, SI-1000 Ljubljana, Slovenia
| | - Vanyo Mitev
- Department of Medical Chemistry and Biochemistry, Medical University Sofia, Sofia, Bulgaria
| | - Albena Todorova
- Department of Medical Chemistry and Biochemistry, Medical University Sofia, Sofia, Bulgaria; Genetic Medico-Diagnostic Laboratory "Genica", Sofia, Bulgaria
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10
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Yu M, Zhu Y, Lu Y, Lv H, Zhang W, Yuan Y, Wang Z. Clinical features and genotypes of Laing distal myopathy in a group of Chinese patients, with in-frame deletions of MYH7 as common mutations. Orphanet J Rare Dis 2020; 15:344. [PMID: 33298082 PMCID: PMC7727133 DOI: 10.1186/s13023-020-01626-y] [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: 06/26/2020] [Accepted: 11/26/2020] [Indexed: 11/24/2022] Open
Abstract
Background Laing distal myopathy is a rare autosomal dominant inherited distal myopathy caused by mutations of the MYH7 gene affecting mainly the rod region. We described the clinical features, muscle MRI and pathological changes as well as genetic mutations in a group of Chinese patients with Laing distal myopathy. Results Six patients with the confirmed diagnoses of Laing distal myopathy were recruited. Ankle dorsiflexion and finger extension weakness, as well as neck flexion weakness were common in our patients. Myopathic as well as neurogenic lesions were suggested by electromyography in different patients. Respiratory abnormality of sleep apnea was detected in two of our patients stressing the necessity of close respiratory monitoring in this disease. Muscle MRIs showed similar features of concentric fatty infiltration of anterior thigh muscles together with early involvement of tibialis anterior and extensor hallucis longus. However, muscle pathological presentations were varied depending on the biopsied muscles and the severity of the disease. In-frame deletions of the MYH7 gene made up 3/4 of mutations in our patients, suggesting that these are common mutations of Laing distal myopathy. Conclusions Our study further expanded the phenotypes and genotypes of Laing distal myopathy. In-frame deletions of the MYH7 gene are common causes of Laing distal myopathy.
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Affiliation(s)
- Meng Yu
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China
| | - Ying Zhu
- Department of Radiology, Peking University First Hospital, Beijing, China
| | - Yuanyuan Lu
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China
| | - He Lv
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China
| | - Wei Zhang
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China
| | - Zhaoxia Wang
- Department of Neurology, Peking University First Hospital, No. 8 Xishiku Street, Beijing, 100034, China.
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11
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Muelas N, Frasquet M, Más-Estellés F, Martí P, Martínez-Vicente L, Sevilla T, Azorín I, Poyatos-García J, Argente-Escrig H, Vílchez R, Vázquez-Costa JF, Bataller L, Vilchez JJ. A study of the phenotypic variability and disease progression in Laing myopathy through the evaluation of muscle imaging. Eur J Neurol 2020; 28:1356-1365. [PMID: 33151602 DOI: 10.1111/ene.14630] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/25/2020] [Accepted: 10/22/2020] [Indexed: 01/20/2023]
Abstract
BACKGROUND Laing myopathy is characterized by broad clinical and pathological variability. They are limited in number and protocol of study. We aimed to delineate muscle imaging profiles and validate imaging analysis as an outcome measure. METHODS This was a cross-sectional and longitudinal cohort study. Data from clinical, functional and semi-quantitative muscle imaging (60 magnetic resonance imaging [MRI] and six computed tomography scans) were studied. Hierarchical analysis, graphic heatmap representation and correlation between imaging and clinical data using Bayesian statistics were carried out. RESULTS The study cohort comprised 42 patients from 13 families harbouring five MYH7 mutations. The cohort had a wide range of ages, age at onset, disease duration, and myopathy extension and Gardner-Medwin and Walton (GMW) functional scores. Intramuscular fat was evident in all but two asymptomatic/pauci-symptomatic patients. Anterior leg compartment muscles were the only affected muscles in 12% of the patients. Widespread extension to the thigh, hip, paravertebral and calf muscles and, less frequently, the scapulohumeral muscles was commonly observed, depicting distinct patterns and rates of progression. Foot muscles were involved in 40% of patients, evolving in parallel to other regions with absence of a disto-proximal gradient. Whole cumulative imaging score, ranging from 0 to 2.9 out of 4, was associated with disease duration and with myopathy extension and GMW scales. Follow-up MRI studies in 24 patients showed significant score progression at a variable rate. CONCLUSIONS We confirmed that the anterior leg compartment is systematically affected in Laing myopathy and may represent the only manifestation of this disorder. However, widespread muscle involvement in preferential but variable and not distance-dependent patterns was frequently observed. Imaging score analysis is useful to categorize patients and to follow disease progression over time.
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Affiliation(s)
- Nuria Muelas
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
| | - Marina Frasquet
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain
| | - Fernando Más-Estellés
- Ascires, Neuroradiology Section, Área Clínica de Imagen Médica, Hospital Universitari I Politècnic La Fe, Valencia, Spain
| | - Pilar Martí
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
| | - Laura Martínez-Vicente
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
| | - Teresa Sevilla
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain.,Department of Medicine, Universitat de València, Valencia, Spain
| | - Inmaculada Azorín
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
| | - Javier Poyatos-García
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain
| | - Herminia Argente-Escrig
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain
| | - Roger Vílchez
- Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
| | - Juan F Vázquez-Costa
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain.,Department of Medicine, Universitat de València, Valencia, Spain
| | - Luis Bataller
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain.,Department of Medicine, Universitat de València, Valencia, Spain
| | - Juan J Vilchez
- Neuromuscular Diseases Unit, Neurology Department, Hospital Universitari I Politècnic La Fe, Valencia, Spain.,Neuromuscular Reference Centre, ERN-EURO-NMD, Valencia, Spain.,Neuromuscular and Ataxias Research Group, Instituto de Investigación Sanitaria La Fe, Valencia, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER, U763, Valencia, Spain
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12
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Topaloglu H. Core myopathies - a short review. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2020; 39:266-273. [PMID: 33458581 PMCID: PMC7783431 DOI: 10.36185/2532-1900-029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 12/01/2022]
Abstract
Congenital myopathies represent a clinically and genetically heterogeneous group of early-onset neuromuscular diseases with characteristic, but not always specific, histopathological features, often presenting with stable and/or slowly progressive truncal and proximal weakness. It is often not possible to have a diagnosis on clinical ground alone. Additional extraocular, respiratory, distal involvement, scoliosis, and distal laxity may provide clues. The "core myopathies" collectively represent the most common form of congenital myopathies, and the name pathologically corresponds to histochemical appearance of focally reduced oxidative enzyme activity and myofibrillar changes on ultrastructural studies. Because of the clinical, pathological, and molecular overlaps, central core disease and multiminicore disease will be discussed together.
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Affiliation(s)
- Haluk Topaloglu
- Correspondence Haluk Topaloglu Yeditepe University Department of Pediatrics, İstanbul, Turkey. E-mail:
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13
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Savarese M, Sarparanta J, Vihola A, Jonson PH, Johari M, Rusanen S, Hackman P, Udd B. Panorama of the distal myopathies. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2020; 39:245-265. [PMID: 33458580 PMCID: PMC7783427 DOI: 10.36185/2532-1900-028] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 12/15/2022]
Abstract
Distal myopathies are genetic primary muscle disorders with a prominent weakness at onset in hands and/or feet. The age of onset (from early childhood to adulthood), the distribution of muscle weakness (upper versus lower limbs) and the histological findings (ranging from nonspecific myopathic changes to myofibrillar disarrays and rimmed vacuoles) are extremely variable. However, despite being characterized by a wide clinical and genetic heterogeneity, the distal myopathies are a category of muscular dystrophies: genetic diseases with progressive loss of muscle fibers. Myopathic congenital arthrogryposis is also a form of distal myopathy usually caused by focal amyoplasia. Massive parallel sequencing has further expanded the long list of genes associated with a distal myopathy, and contributed identifying as distal myopathy-causative rare variants in genes more often related with other skeletal or cardiac muscle diseases. Currently, almost 20 genes (ACTN2, CAV3, CRYAB, DNAJB6, DNM2, FLNC, HNRNPA1, HSPB8, KHLH9, LDB3, MATR3, MB, MYOT, PLIN4, TIA1, VCP, NOTCH2NLC, LRP12, GIPS1) have been associated with an autosomal dominant form of distal myopathy. Pathogenic changes in four genes (ADSSL, ANO5, DYSF, GNE) cause an autosomal recessive form; and disease-causing variants in five genes (DES, MYH7, NEB, RYR1 and TTN) result either in a dominant or in a recessive distal myopathy. Finally, a digenic mechanism, underlying a Welander-like form of distal myopathy, has been recently elucidated. Rare pathogenic mutations in SQSTM1, previously identified with a bone disease (Paget disease), unexpectedly cause a distal myopathy when combined with a common polymorphism in TIA1. The present review aims at describing the genetic basis of distal myopathy and at summarizing the clinical features of the different forms described so far.
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Affiliation(s)
- Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Jaakko Sarparanta
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Anna Vihola
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
- Neuromuscular Research Center, Department of Genetics, Fimlab Laboratories, Tampere, Finland
| | - Per Harald Jonson
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Mridul Johari
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Salla Rusanen
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
- Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
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14
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Alessi CE, Wu Q, Whitaker CH, Felice KJ. Laing Myopathy: Report of 4 New Families With Novel MYH7 Mutations, Double Mutations, and Severe Phenotype. J Clin Neuromuscul Dis 2020; 22:22-34. [PMID: 32833721 DOI: 10.1097/cnd.0000000000000297] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Laing distal myopathy (LDM) is an autosomal dominant disorder caused by mutations in the slow skeletal muscle fiber myosin heavy chain (MYH7) gene on chromosome 14q11.2. The classic LDM phenotype-including early-onset, initial involvement of foot dorsiflexors and great toe extensors, followed by weakness of neck flexors and finger extensors-is well documented. Since the original report by Laing et al in 1995, the spectrum of MYH7-related myopathies has expanded to include congenital myopathies, late-onset myopathies, myosin storage myopathy, and scapuloperoneal myopathies. Most patients with LDM harbor mutations in the midrod domain of the MYH7 gene, but rare cases document disease-associated mutations in the globular head region. In this report, we add to the medical literature by describing the clinicopathological findings in 8 affected family members from 4 new LDM families-including 2 with novel MYH7 mutations (Y162D and A1438P), one with dual mutations (V39M and K1617del), and one family (E1508del) with severe early-onset weakness associated with contractures, respiratory insufficiency, and dilated cardiomyopathy. Our families highlight the ever-expanding clinical spectrum and genetic variation of the skeletal myopathies related to MYH7 gene mutations.
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Affiliation(s)
| | - Qian Wu
- Pathology and Laboratory Medicine, University of Connecticut School of Medicine, Farmington, CT; and
| | - Charles H Whitaker
- Department of Neuromuscular Medicine, Muscular Dystrophy Association Care Center, Hospital for Special Care, New Britain, CT
| | - Kevin J Felice
- Department of Neuromuscular Medicine, Muscular Dystrophy Association Care Center, Hospital for Special Care, New Britain, CT
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15
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Papadimas GK, Xirou S, Kararizou E, Papadopoulos C. Update on Congenital Myopathies in Adulthood. Int J Mol Sci 2020; 21:ijms21103694. [PMID: 32456280 PMCID: PMC7279481 DOI: 10.3390/ijms21103694] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/17/2020] [Accepted: 05/19/2020] [Indexed: 12/11/2022] Open
Abstract
Congenital myopathies (CMs) constitute a group of heterogenous rare inherited muscle diseases with different incidences. They are traditionally grouped based on characteristic histopathological findings revealed on muscle biopsy. In recent decades, the ever-increasing application of modern genetic technologies has not just improved our understanding of their pathophysiology, but also expanded their phenotypic spectrum and contributed to a more genetically based approach for their classification. Later onset forms of CMs are increasingly recognised. They are often considered milder with slower progression, variable clinical presentations and different modes of inheritance. We reviewed the key features and genetic basis of late onset CMs with a special emphasis on those forms that may first manifest in adulthood.
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16
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Gil-Gálvez A, Carbonell-Corvillo P, Paradas C, Miranda-Vizuete A. Cautionary note on the use of Caenorhabditis elegans to study muscle phenotypes caused by mutations in the human MYH7 gene. Biotechniques 2020; 68:296-299. [PMID: 32301330 DOI: 10.2144/btn-2020-0012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Mutations in the human MYH7 gene, encoding a slow skeletal muscle/β-cardiac myosin heavy chain, cause different types of myopathies. The nematode model Caenorhabditis elegans has frequently been employed to study the molecular and physiological consequences of MYH7 mutations in muscle function by introducing mutations into the unc-54 gene, the worm MYH7 ortholog. We report here that the C. elegans model is not appropriate for such studies if they involve expression of the UNC-54 protein (wild-type or fused to green fluorescent protein) above endogenous levels.
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Affiliation(s)
- Alejandro Gil-Gálvez
- Redox Homeostasis Group, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Sevilla, Spain
| | - Pilar Carbonell-Corvillo
- Neuromuscular Unit, Department of Neurology, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Sevilla, Spain
| | - Carmen Paradas
- Neuromuscular Unit, Department of Neurology, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Sevilla, Spain
| | - Antonio Miranda-Vizuete
- Redox Homeostasis Group, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Sevilla, Spain
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17
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Negrão L, Machado R, Lourenço M, Fernandez-Marmiesse A, Rebelo O. Laing early-onset distal myopathy with subsarcolemmal hyaline bodies caused by a novel variant in the MYH7 gene. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2020; 39:24-28. [PMID: 32607476 PMCID: PMC7315894 DOI: 10.36185/2532-1900-004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 03/20/2020] [Indexed: 12/02/2022]
Abstract
Myopathies caused by MYH7 gene mutations are clinically and pathologically heterogeneous and, until recently, difficult to diagnose. The availability of NGS panels for hereditary neuromuscular diseases changed our insight regarding their frequency and allowed a better perception of the different phenotypes and morphological abnormalities associated. We present a male Portuguese patient with the classical phenotype of Laing early-onset distal myopathy (MPD1) beginning at 6 years of age, very slowly progressive, and with a mild to moderate impact on daily life by the age of 56. Muscle biopsy showed a myopathic pattern with hyaline bodies and cores. The NGS panel for structural myopathies identified a novel missense heterozygous variant, c.T4652C (p.Leu1551Pro), in the exon 34 of the MYH7 gene.
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Affiliation(s)
- Luís Negrão
- Neuromuscular Disease Unit, Neurology Department, Coimbra University and Hospital Centre, Coimbra, Portugal
| | - Rita Machado
- Neuromuscular Disease Unit, Neurology Department, Coimbra University and Hospital Centre, Coimbra, Portugal
| | - Miguel Lourenço
- Neurology Department, Hospital de Santo Espírito da Ilha Terceira, Angra do Heroísmo, Portugal
| | - Ana Fernandez-Marmiesse
- Unit for the Diagnosis and Treatment of Congenital Metabolic Diseases, Clinical University Hospital of Santiago de Compostela, Health Research Institute of Santiago de Compostela, Santiago de Compostela, Spain.,Genomes & Disease Group, Molecular Medicine and Chronic Diseases Research Centre (CiMUS), Santiago de Compostela University - IDIS, Santiago de Compostela, Spain
| | - Olinda Rebelo
- Neuromuscular Disease Unit, Neurology Department, Coimbra University and Hospital Centre, Coimbra, Portugal
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18
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Hara K, Miyata H, Nishino I. [A case of Japanese Laing type distal myopathy with a mutation in MYH7 gene]. Rinsho Shinkeigaku 2019; 59:823-828. [PMID: 31761835 DOI: 10.5692/clinicalneurol.cn-001333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A 67-year-old man developed weakness and atrophy of the anterior compartment of the lower leg at age 53 years, followed by weakness of proximal muscles of the upper limb. His father had difficulties in walking in his thirties and died of heart disease at age 45 years. He also had mild respiratory weakness without cardiac involvement. Muscle histology showed spheroid or cytoplasmic bodies-like inclusions with moth-eaten appearance and irregular intramyofibrillar network. Electron microscopy revealed abnormally thickened and disorganized Z lines (Z line streaming) between the surrounding myofibrils and electron-dense globular deposits. These pathological findings apparently suggested myofibrillar myopathy. However, genetic analysis revealed a mutation (c.5566G>A, p.E1856K) in MYH7 gene, that is responsible for Laing-type distal myopathy (LDM). This mutation was previously reported in a study from Austria. This is the first report of LDM in the Japanese population .
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Affiliation(s)
- Kenju Hara
- Department of Neurology, Akita Red Cross Hospital
| | - Hajime Miyata
- Department of Neuropathology, Akita Cerebrospinal and Cardiovascular Center
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neurology, National Center of Neurology and Psychiatry
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19
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Ko JY, Lee M, Jang JH, Jang DH, Ryu JS. A novel de novo mutation in MYH7 gene in a patient with early onset muscular weakness and severe kyphoscoliosis: A case report. Medicine (Baltimore) 2019; 98:e16389. [PMID: 31305444 PMCID: PMC6641756 DOI: 10.1097/md.0000000000016389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
INTRODUCTION Various phenotypes have been identified for MYH7 gene mutation-related myopathy. Here, we describe a patient with severe muscular weakness and skeletal deformity with de novo heterozygous MYH7 gene mutation. PATIENT CONCERNS A 33-year-old woman presented with early onset of muscular weakness, with delayed motor development during infancy. At age 8 years, she was unable to walk, with signs of skeletal deformity, including the progression of kyphoscoliosis. At age 31 years, she developed dyspnea. DIAGNOSIS She diagnosed with esophageal hiatal hernia with abdominal CT. In electromyography, short duration, small amplitude motor unit action potential (MUAP), and early recruitment patterns were observed in the involved proximal muscles, suggesting myopathy. Muscle histopathology showed fiber-type disproportion. INTERVENTIONS Next-generation sequencing study revealed a heterozygous in-frame deletion variation in the exon 14 of the MYH7 gene (c.1498_1500del/p.Glu500del), which is a novel variation confirmed by conventional Sanger sequencing. Compared with the parental test, this variant was concluded as de novo. OUTCOMES She received laparoscopic hiatal hernia repair and Nissen fundoplication for esophageal hiatal hernia. After surgery, her postural dyspnea improved. As there is no fundamental treatment for MYH7-related myopathies, she continued conservative treatment for her symptoms. CONCLUSION Here, we presented a rare case of de novo mutation of the myosin head domain in the MYH7 gene. This report broadens both the phenotypic and genotypic spectra of MYH7-related myopathies.
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Affiliation(s)
- Jin Young Ko
- Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - Minyong Lee
- Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul
| | | | - Dae-Hyun Jang
- Department of Rehabilitation Medicine, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Ju Seok Ryu
- Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
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20
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Merlini L, Sabatelli P, Antoniel M, Carinci V, Niro F, Monetti G, Torella A, Giugliano T, Faldini C, Nigro V. Congenital myopathy with hanging big toe due to homozygous myopalladin (MYPN) mutation. Skelet Muscle 2019; 9:14. [PMID: 31133047 PMCID: PMC6535860 DOI: 10.1186/s13395-019-0199-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 04/25/2019] [Indexed: 12/11/2022] Open
Abstract
Background Myopalladin (MYPN) is a component of the sarcomere that tethers nebulin in skeletal muscle and nebulette in cardiac muscle to alpha-actinin at the Z lines. Autosomal dominant MYPN mutations cause hypertrophic, dilated, or restrictive cardiomyopathy. Autosomal recessive MYPN mutations have been reported in only six families showing a mildly progressive nemaline or cap myopathy with cardiomyopathy in some patients. Case presentation A consanguineous family with congenital to adult-onset muscle weakness and hanging big toe was reported. Muscle biopsy showed minimal changes with internal nuclei, type 1 fiber predominance, and ultrastructural defects of Z line. Muscle CT imaging showed marked hypodensity of the sartorius bilaterally and MRI scattered abnormal high-intensity areas in the internal tongue muscle and in the posterior cervical muscles. Cardiac involvement was demonstrated by magnetic resonance imaging and late gadolinium enhancement. Whole exome sequencing analysis identified a homozygous loss of function single nucleotide deletion in the exon 11 of the MYPN gene in two siblings. Full-length MYPN protein was undetectable on immunoblotting, and on immunofluorescence, its localization at the Z line was missed. Conclusions This report extends the phenotypic spectrum of recessive MYPN-related myopathies showing: (1) the two patients had hanging big toe and the oldest one developed spine and hand contractures, none of these signs observed in the previously reported patients, (2) specific ultrastructural changes consisting in Z line fragmentation, but (3) no nemaline or caps on muscle pathology.
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Affiliation(s)
- Luciano Merlini
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Patrizia Sabatelli
- IRCCS-Istituto Ortopedico Rizzoli, Bologna, Italy.,Institute of Molecular Genetics, National Research Council of Italy, Bologna, Italy
| | - Manuela Antoniel
- Institute of Molecular Genetics, National Research Council of Italy, Bologna, Italy
| | | | - Fabio Niro
- Division of Cardiology, Hospital St. Orsola, Bologna, Italy
| | | | - Annalaura Torella
- Dipartimento di Medicina di Precisione, Università della Campania "Luigi Vanvitelli", Naples, Italy.,Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Italy
| | - Teresa Giugliano
- Dipartimento di Medicina di Precisione, Università della Campania "Luigi Vanvitelli", Naples, Italy
| | - Cesare Faldini
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Clinic of Orthopaedic and Traumatology, Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Vincenzo Nigro
- Dipartimento di Medicina di Precisione, Università della Campania "Luigi Vanvitelli", Naples, Italy. .,Telethon Institute of Genetics and Medicine (TIGEM), Pozzuoli, Italy.
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21
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Stavusis J, Lace B, Schäfer J, Geist J, Inashkina I, Kidere D, Pajusalu S, Wright NT, Saak A, Weinhold M, Haubenberger D, Jackson S, Kontrogianni-Konstantopoulos A, Bönnemann CG. Novel mutations in MYBPC1 are associated with myogenic tremor and mild myopathy. Ann Neurol 2019; 86:129-142. [PMID: 31025394 DOI: 10.1002/ana.25494] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 04/23/2019] [Accepted: 04/25/2019] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To define a distinct, dominantly inherited, mild skeletal myopathy associated with prominent and consistent tremor in two unrelated, three-generation families. METHODS Clinical evaluations as well as exome and panel sequencing analyses were performed in affected and nonaffected members of two families to identify genetic variants segregating with the phenotype. Histological assessment of a muscle biopsy specimen was performed in 1 patient, and quantitative tremor analysis was carried out in 2 patients. Molecular modeling studies and biochemical assays were performed for both mutations. RESULTS Two novel missense mutations in MYBPC1 (p.E248K in family 1 and p.Y247H in family 2) were identified and shown to segregate perfectly with the myopathy/tremor phenotype in the respective families. MYBPC1 encodes slow myosin binding protein-C (sMyBP-C), a modular sarcomeric protein playing structural and regulatory roles through its dynamic interaction with actin and myosin filaments. The Y247H and E248K mutations are located in the NH2 -terminal M-motif of sMyBP-C. Both mutations result in markedly increased binding of the NH2 terminus to myosin, possibly interfering with normal cross-bridge cycling as the first muscle-based step in tremor genesis. The clinical tremor features observed in all mutation carriers, together with the tremor physiology studies performed in family 2, suggest amplification by an additional central loop modulating the clinical tremor phenomenology. INTERPRETATION Here, we link two novel missense mutations in MYBPC1 with a dominant, mild skeletal myopathy invariably associated with a distinctive tremor. The molecular, genetic, and clinical studies are consistent with a unique sarcomeric origin of the tremor, which we classify as "myogenic tremor." ANN NEUROL 2019.
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Affiliation(s)
- Janis Stavusis
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | - Baiba Lace
- Latvian Biomedical Research and Study Centre, Riga, Latvia.,Centre Hospitalier Universitaire de Québec, Ville de Québec, QC, Canada
| | - Jochen Schäfer
- Department of Neurology-Uniklinikum CG Carus, Dresden, Germany
| | - Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD
| | - Inna Inashkina
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | - Dita Kidere
- Latvian Biomedical Research and Study Centre, Riga, Latvia
| | - Sander Pajusalu
- Department of Clinical Genetics, United Laboratories, Tartu University Hospital, Tartu, Estonia.,Department of Clinical Genetics, Institute of Clinical Medicine, Tartu University, Tartu, Estonia
| | - Nathan T Wright
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, VA
| | - Annika Saak
- Department of Neurology-Uniklinikum CG Carus, Dresden, Germany
| | - Manja Weinhold
- Department of Neurology-Uniklinikum CG Carus, Dresden, Germany
| | - Dietrich Haubenberger
- Clinical Trials Unit, Office of the Clinical Director, NINDS Intramural Research Program, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD
| | - Sandra Jackson
- Department of Neurology-Uniklinikum CG Carus, Dresden, Germany
| | | | - Carsten G Bönnemann
- Neuromuscular and Neurogenetic Disorders of Childhood Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD
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Abstract
Congenital myopathies (CM) are a genetically heterogeneous group of neuromuscular disorders most commonly presenting with neonatal/childhood-onset hypotonia and muscle weakness, a relatively static or slowly progressive disease course, and originally classified into subcategories based on characteristic histopathologic findings in muscle biopsies. This enduring concept of disease definition and classification based on the clinicopathologic phenotype was pioneered in the premolecular era. Advances in molecular genetics have brought into focus the increased blurring of the original seemingly "watertight" categories through broadening of the clinical phenotypes in existing genes, and continuous identification of novel genetic backgrounds. This review summarizes the histopathologic landscape of the 4 "classical" subtypes of CM-nemaline myopathies, core myopathies, centronuclear myopathies, and congenital fiber type disproportion and some of the emerging and novel genetic diseases with a CM presentation.
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Affiliation(s)
- Rahul Phadke
- Dubowitz Neuromuscular Centre, Great Ormond Street Hospital for Children and Division of Neuropathology, National Hospital for Neurology and Neurosurgery, London, UK; Department of Neurodegenerative Disease, UCL Queen Square Institute of Neurology, London, UK.
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23
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Huang G, Liu J, Yang C, Xiang Y, Wang Y, Wang J, Cao M, Yang W. RNA sequencing discloses the genome‑wide profile of long noncoding RNAs in dilated cardiomyopathy. Mol Med Rep 2019; 19:2569-2580. [PMID: 30720098 PMCID: PMC6423559 DOI: 10.3892/mmr.2019.9937] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 01/17/2019] [Indexed: 12/13/2022] Open
Abstract
Dilated cardiomyopathy (DCM) is a common type of non‑ischemic cardiomyopathy, of which the underlying mechanisms have not yet been fully elucidated. Long noncoding RNAs (lncRNAs) have been reported to serve crucial physiological roles in various cardiac diseases. However, the genome‑wide expression profile of lncRNAs remains to be elucidated in DCM. In the present study, a case‑control study was performed to identify expression deviations in circulating lncRNAs between patients with DCM and controls by RNA sequencing. Partial dysregulated lncRNAs were validated by reverse transcription‑polymerase chain reaction. Gene Ontology, Kyoto Encyclopedia of Genes and Genomes pathway, and lncRNA‑messenger RNA (mRNA) co‑expression network analyses were employed to probe potential functions of these dysregulated lncRNAs in DCM. Comparison between 8 DCM and 8 control samples demonstrated that there were alterations in the expression levels of 988 lncRNAs and 1,418 mRNAs in total. The dysregulated lncRNAs were found to be mainly associated with system development, organ morphogenesis and metabolic regulation in terms of 'biological processes'. Furthermore, the analysis revealed that the gap junction pathway, phagosome, and dilated and hypertrophic cardiomyopathy pathways may serve crucial roles in the development of DCM. The lncRNA‑mRNA co‑expression network also suggested that the target genes of the lncRNAs were different in patients with DCM as compared with those in the controls. In conclusion, the present study revealed the genome‑wide profile of circulating lncRNAs in DCM by RNA sequencing, and explored the potential functions of these lncRNAs in DCM using bioinformatics analysis. These findings provide a theoretical foundation for future studies of lncRNAs in DCM.
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Affiliation(s)
- Guangyong Huang
- Department of Cardiology, Liaocheng People's Hospital of Shandong University, Liaocheng, Shandong 252000, P.R. China
| | - Jingwen Liu
- Department of Cardiology, Liaocheng People's Hospital of Shandong University, Liaocheng, Shandong 252000, P.R. China
| | - Chuansheng Yang
- Department of Cardiology, Liaocheng People's Hospital of Shandong University, Liaocheng, Shandong 252000, P.R. China
| | - Youzhang Xiang
- Shandong Institute for Endemic Disease Control, Jinan, Shandong 250014, P.R. China
| | - Yuehai Wang
- Department of Cardiology, Liaocheng People's Hospital of Shandong University, Liaocheng, Shandong 252000, P.R. China
| | - Jing Wang
- Shandong Institute for Endemic Disease Control, Jinan, Shandong 250014, P.R. China
| | - Miaomiao Cao
- Department of Cardiology, Liaocheng People's Hospital of Shandong University, Liaocheng, Shandong 252000, P.R. China
| | - Wenbo Yang
- Department of Cardiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
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24
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Carbonell-Corvillo P, Tristán-Clavijo E, Cabrera-Serrano M, Servián-Morilla E, García-Martín G, Villarreal-Pérez L, Rivas-Infante E, Area-Gómez E, Chamorro-Muñoz M, Gil-Gálvez A, Miranda-Vizuete A, Martinez-Mir A, Laing N, Paradas C. A novel MYH7 founder mutation causing Laing distal myopathy in Southern Spain. Neuromuscul Disord 2018; 28:828-836. [DOI: 10.1016/j.nmd.2018.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 07/12/2018] [Accepted: 07/19/2018] [Indexed: 01/11/2023]
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25
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Yan X, Huang Y, Wu J. Identify Cross Talk Between Circadian Rhythm and Coronary Heart Disease by Multiple Correlation Analysis. J Comput Biol 2018; 25:1312-1327. [PMID: 30234379 DOI: 10.1089/cmb.2017.0254] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Disorder in circadian rhythm has been revealed as a risk factor for coronary heart disease. Several studies in molecular biology established a gene interaction network using coronary heart susceptibility genes and the circadian rhythm pathway. However, cross talk between genes was mostly discovered in single gene pairs. There might be combination sets of genes intergraded as a unit to regulate the network. To resolve multiple variables in coronary heart susceptibility genes controlling circadian rhythm pathways, a multiple correlation analysis was applied to the transcriptome. Nine genes, including CUGBP, Elav-like family member (CELF); sodium leak channel, nonselective (NALCN); protein phosphatase 2 regulatory subunit B gamma (PPP2R2C); tubulin alpha 1c (TUBA1C); microtubule-associated protein 4 (MAP4); cofilin 1 (CFL1); myosin heavy chain 7 (MYH7); QKI, KH domain containing RNA binding (QKI); and maternal embryonic leucine zipper kinase (MELK), from coronary heart susceptibility were identified to predict the outcome of a linear combination of circadian rhythm pathway genes with R factor more than 0.7. G protein subunit alpha o1 (GNAO1), protein kinase C gamma (PRKCG), RBX, and G protein subunit beta 1 (GNB1) in the circadian rhythm pathway are characterized as combination variables to coexpress with coronary heart susceptibility genes.
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Affiliation(s)
- Xiaoping Yan
- 1 Department of Cardiology, Fujian Medical University Union Hospital, Fujian Institute of Coronary Heart Disease, Fuzhou, Fujian, China
| | - Yu Huang
- 1 Department of Cardiology, Fujian Medical University Union Hospital, Fujian Institute of Coronary Heart Disease, Fuzhou, Fujian, China
| | - Jiabin Wu
- 2 Department of Nephrology, Fujian Provincial Hospital, Fujian Medical University , Fuzhou, China
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26
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Drosophila model of myosin myopathy rescued by overexpression of a TRIM-protein family member. Proc Natl Acad Sci U S A 2018; 115:E6566-E6575. [PMID: 29946036 DOI: 10.1073/pnas.1800727115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Myosin is a molecular motor indispensable for body movement and heart contractility. Apart from pure cardiomyopathy, mutations in MYH7 encoding slow/β-cardiac myosin heavy chain also cause skeletal muscle disease with or without cardiac involvement. Mutations within the α-helical rod domain of MYH7 are mainly associated with Laing distal myopathy. To investigate the mechanisms underlying the pathology of the recurrent causative MYH7 mutation (K1729del), we have developed a Drosophila melanogaster model of Laing distal myopathy by genomic engineering of the Drosophila Mhc locus. Homozygous MhcK1728del animals die during larval/pupal stages, and both homozygous and heterozygous larvae display reduced muscle function. Flies expressing only MhcK1728del in indirect flight and jump muscles, and heterozygous MhcK1728del animals, were flightless, with reduced movement and decreased lifespan. Sarcomeres of MhcK1728del mutant indirect flight muscles and larval body wall muscles were disrupted with clearly disorganized muscle filaments. Homozygous MhcK1728del larvae also demonstrated structural and functional impairments in heart muscle, which were not observed in heterozygous animals, indicating a dose-dependent effect of the mutated allele. The impaired jump and flight ability and the myopathy of indirect flight and leg muscles associated with MhcK1728del were fully suppressed by expression of Abba/Thin, an E3-ligase that is essential for maintaining sarcomere integrity. This model of Laing distal myopathy in Drosophila recapitulates certain morphological phenotypic features seen in Laing distal myopathy patients with the recurrent K1729del mutation. Our observations that Abba/Thin modulates these phenotypes suggest that manipulation of Abba/Thin activity levels may be beneficial in Laing distal myopathy.
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27
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Bugiardini E, Morrow JM, Shah S, Wood CL, Lynch DS, Pitmann AM, Reilly MM, Houlden H, Matthews E, Parton M, Hanna MG, Straub V, Yousry TA. The Diagnostic Value of MRI Pattern Recognition in Distal Myopathies. Front Neurol 2018; 9:456. [PMID: 29997562 PMCID: PMC6028608 DOI: 10.3389/fneur.2018.00456] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 05/29/2018] [Indexed: 12/14/2022] Open
Abstract
Objective: Distal myopathies are a diagnostically challenging group of diseases. We wanted to understand the value of MRI in the current clinical setting and explore the potential for optimizing its clinical application. Methods: We retrospectively audited the diagnostic workup in a distal myopathy patient cohort, reassessing the diagnosis, whilst documenting the usage of MRI. We established a literature based distal myopathies MRI pattern template and assessed its diagnostic utility in terms of sensitivity, specificity, and potential impact on the diagnostic workup. Results: Fifty-five patients were included; in 38 with a comprehensive set of data the diagnostic work-up was audited. The median time from symptoms onset to diagnosis was 12.1 years. The initial genetic diagnostic rate was 39%; 18% were misdiagnosed as neuropathies and 13% as inclusion body myositis (IBM). Based on 21 publications we established a MRI pattern template. Its overall sensitivity (50%) and specificity (32%) were low. However in some diseases (e.g., MYOT-related myopathy, TTN-HMERF) MRI correctly identified the causative gene. The number of genes suggested by MRI pattern analysis was smaller compared to clinical work up (median 1 vs. 9, p < 0.0001) but fewer genes were correctly predicted (5/10 vs. 7/10). MRI analysis ruled out IBM in all cases. Conclusion: In the diagnostic work-up of distal myopathies, MRI is useful in assisting genetic testing and avoiding misdiagnosis (IBM). The overall low sensitivity and specificity limits its generalized use when traditional single gene test methods are applied. However, in the context of next generation sequencing MRI may represent a valuable tool for interpreting complex genetic results.
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Affiliation(s)
- Enrico Bugiardini
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Jasper M. Morrow
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Sachit Shah
- Neuroradiological Academic Unit, UCL Institute of Neurology, London, United Kingdom
- Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Claire L. Wood
- John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle upon Tyne, United Kingdom
| | - David S. Lynch
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, United Kingdom
| | - Alan M. Pitmann
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, United Kingdom
| | - Mary M. Reilly
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, United Kingdom
| | - Henry Houlden
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, United Kingdom
| | - Emma Matthews
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Matt Parton
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Michael G. Hanna
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, United Kingdom
| | - Volker Straub
- John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle upon Tyne, United Kingdom
| | - Tarek A. Yousry
- MRC Centre for Neuromuscular Diseases, UCL Institute of Neurology and National Hospital for Neurology and Neurosurgery, London, United Kingdom
- Neuroradiological Academic Unit, UCL Institute of Neurology, London, United Kingdom
- Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
- *Correspondence: Tarek A. Yousry
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28
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MYH7 mutation associated with two phenotypes of myopathy. Neurol Sci 2017; 39:333-339. [PMID: 29170849 DOI: 10.1007/s10072-017-3192-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 11/07/2017] [Indexed: 10/18/2022]
Abstract
The mutations of MYH7 (slow skeletal/β-cardiac myosin heavy chain) are commonly found in familial hypertrophic/dilated cardiomyopathy, and also can cause Laing early-onset distal myopathy (LDM), myosin storage myopathy (MSM), and congenital myopathy with fiber-type disproportion (CFTD). Here we report two cases whose diagnosis was hereditary myopathy according to clinical feature and muscle pathology analysis. High-throughput genomic sequencing (next generation sequencing) was performed to validate the diagnosis. Two MYH7 mutations, p.R1845W and p.E1687del, were identified. p.R1845W was found in a male patient showing weakness of both terminal lower legs without foot drop. Muscle pathology stainings characteristically showed the hyaline body in the intracytoplasmic location. The novel mutation p.E1687del was found in a family with seven patients. The proband showed foot drop, scoliosis, and winged scapula, while his mother only showed mild foot drop and winged scapula. Muscle pathology analysis showed congenital centronucleus myopathy. Both cases only showed muscular disorder and had no cardiomyopathy. This study, for the first time, reports the MYH7 mutations associated with centronucleus myopathy.
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29
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Myosin Storage Myopathy in C. elegans and Human Cultured Muscle Cells. PLoS One 2017; 12:e0170613. [PMID: 28125727 PMCID: PMC5268365 DOI: 10.1371/journal.pone.0170613] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 01/06/2017] [Indexed: 02/06/2023] Open
Abstract
Myosin storage myopathy is a protein aggregate myopathy associated with the characteristic subsarcolemmal accumulation of myosin heavy chain in muscle fibers. Despite similar histological findings, the clinical severity and age of onset are highly variable, ranging from no weakness to severe impairment of ambulation, and usually childhood-onset to onset later in life. Mutations located in the distal end of the tail of slow/ß-cardiac myosin heavy chain are associated with myosin storage myopathy. Four missense mutations (L1793P, R1845W, E1883K and H1901L), two of which have been reported in several unrelated families, are located within or closed to the assembly competence domain. This location is critical for the proper assembly of sarcomeric myosin rod filaments. To assess the mechanisms leading to protein aggregation in myosin storage myopathy and to evaluate the impact of these mutations on myosin assembly and muscle function, we expressed mutated myosin proteins in cultured human muscle cells and in the nematode Caenorhabditis elegans. While L1793P mutant myosin protein efficiently incorporated into the sarcomeric thick filaments, R1845W and H1901L mutants were prone to formation of myosin aggregates without assembly into striated sarcomeric thick filaments in cultured muscle cells. In C. elegans, mutant alleles of the myosin heavy chain gene unc-54 corresponding to R1845W, E1883K and H1901L, were as effective as the wild-type myosin gene in rescuing the null mutant worms, indicating that they retain functionality. Taken together, our results suggest that the basis for the pathogenic effect of the R1845W and H1901L mutations are primarily structural rather than functional. Further analyses are needed to identify the primary trigger for the histological changes seen in muscle biopsies of patients with L1793P and E1883K mutations.
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Laing distal myopathy with a novel mutation in exon 34 of the MYH7 gene. Neuromuscul Disord 2016; 26:598-603. [DOI: 10.1016/j.nmd.2016.06.458] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Revised: 06/19/2016] [Accepted: 06/20/2016] [Indexed: 12/12/2022]
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Ravenscroft G, Davis MR, Lamont P, Forrest A, Laing NG. New era in genetics of early-onset muscle disease: Breakthroughs and challenges. Semin Cell Dev Biol 2016; 64:160-170. [PMID: 27519468 DOI: 10.1016/j.semcdb.2016.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 08/07/2016] [Accepted: 08/08/2016] [Indexed: 10/21/2022]
Abstract
Early-onset muscle disease includes three major entities that present generally at or before birth: congenital myopathies, congenital muscular dystrophies and congenital myasthenic syndromes. Almost exclusively there is weakness and hypotonia, although cases manifesting hypertonia are increasingly being recognised. These diseases display a wide phenotypic and genetic heterogeneity, with the uptake of next generation sequencing resulting in an unparalleled extension of the phenotype-genotype correlations and "diagnosis by sequencing" due to unbiased sequencing. Perhaps now more than ever, detailed clinical evaluations are necessary to guide the genetic diagnosis; with arrival at a molecular diagnosis frequently occurring following dialogue between the molecular geneticist, the referring clinician and the pathologist. There is an ever-increasing blurring of the boundaries between the congenital myopathies, dystrophies and myasthenic syndromes. In addition, many novel disease genes have been described and new insights have been gained into skeletal muscle development and function. Despite the advances made, a significant percentage of patients remain without a molecular diagnosis, suggesting that there are many more human disease genes and mechanisms to identify. It is now technically- and clinically-feasible to perform next generation sequencing for severe diseases on a population-wide scale, such that preconception-carrier screening can occur. Newborn screening for selected early-onset muscle diseases is also technically and ethically-achievable, with benefits to the patient and family from early management of these diseases and should also be implemented. The need for world-wide Reference Centres to meticulously curate polymorphisms and mutations within a particular gene is becoming increasingly apparent, particularly for interpretation of variants in the large genes which cause early-onset myopathies: NEB, RYR1 and TTN. Functional validation of candidate disease variants is crucial for accurate interpretation of next generation sequencing and appropriate genetic counseling. Many published "pathogenic" variants are too frequent in control populations and are thus likely rare polymorphisms. Mechanisms need to be put in place to systematically update the classification of variants such that accurate interpretation of variants occurs. In this review, we highlight the recent advances made and the challenges ahead for the molecular diagnosis of early-onset muscle diseases.
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Affiliation(s)
- Gianina Ravenscroft
- Harry Perkins Institute of Medical Research and the Centre for Medical Research, University of Western Australia, Nedlands, Australia
| | - Mark R Davis
- Department of Diagnostic Genomics, Pathwest, QEII Medical Centre, Nedlands, Australia
| | - Phillipa Lamont
- Harry Perkins Institute of Medical Research and the Centre for Medical Research, University of Western Australia, Nedlands, Australia; Neurogenetic unit, Dept of Neurology, Royal Perth Hospital and The Perth Children's Hospital, Western Australia, Australia
| | - Alistair Forrest
- Harry Perkins Institute of Medical Research and the Centre for Medical Research, University of Western Australia, Nedlands, Australia
| | - Nigel G Laing
- Harry Perkins Institute of Medical Research and the Centre for Medical Research, University of Western Australia, Nedlands, Australia; Department of Diagnostic Genomics, Pathwest, QEII Medical Centre, Nedlands, Australia.
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32
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Fiorillo C, Astrea G, Savarese M, Cassandrini D, Brisca G, Trucco F, Pedemonte M, Trovato R, Ruggiero L, Vercelli L, D'Amico A, Tasca G, Pane M, Fanin M, Bello L, Broda P, Musumeci O, Rodolico C, Messina S, Vita GL, Sframeli M, Gibertini S, Morandi L, Mora M, Maggi L, Petrucci A, Massa R, Grandis M, Toscano A, Pegoraro E, Mercuri E, Bertini E, Mongini T, Santoro L, Nigro V, Minetti C, Santorelli FM, Bruno C. MYH7-related myopathies: clinical, histopathological and imaging findings in a cohort of Italian patients. Orphanet J Rare Dis 2016; 11:91. [PMID: 27387980 PMCID: PMC4936326 DOI: 10.1186/s13023-016-0476-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 06/22/2016] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Myosin heavy chain 7 (MYH7)-related myopathies are emerging as an important group of muscle diseases of childhood and adulthood, with variable clinical and histopathological expression depending on the type and location of the mutation. Mutations in the head and neck domains are a well-established cause of hypertrophic cardiomyopathy whereas mutation in the distal regions have been associated with a range of skeletal myopathies with or without cardiac involvement, including Laing distal myopathy and Myosin storage myopathy. Recently the spectrum of clinical phenotypes associated with mutations in MYH7 has increased, blurring this scheme and adding further phenotypes to the list. A broader disease spectrum could lead to misdiagnosis of different congenital myopathies, neurogenic atrophy and other neuromuscular conditions. RESULTS As a result of a multicenter Italian study we collected clinical, histopathological and imaging data from a population of 21 cases from 15 families, carrying reported or novel mutations in MYH7. Patients displayed a variable phenotype including atypical pictures, as dropped head and bent spine, which cannot be classified in previously described groups. Half of the patients showed congenital or early infantile weakness with predominant distal weakness. Conversely, patients with later onset present prevalent proximal weakness. Seven patients were also affected by cardiomyopathy mostly in the form of non-compacted left ventricle. Muscle biopsy was consistent with minicores myopathy in numerous cases. Muscle MRI was meaningful in delineating a shared pattern of selective involvement of tibialis anterior muscles, with relative sparing of quadriceps. CONCLUSION This work adds to the genotype-phenotype correlation of MYH7-relatedmyopathies confirming the complexity of the disorder.
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Affiliation(s)
- C Fiorillo
- IRCCS Stella Maris, Molecular Medicine and Neuromuscular Disorders, Via dei Giacinti 2, 56128, Calambrone, Pisa, Italy. .,Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternad and Child Health, University of Genova, University of Genoa, Genoa, Italy.
| | - G Astrea
- IRCCS Stella Maris, Molecular Medicine and Neuromuscular Disorders, Via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - M Savarese
- Telethon Institute of Genetics and Medicine, Naples, Italy
| | - D Cassandrini
- IRCCS Stella Maris, Molecular Medicine and Neuromuscular Disorders, Via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - G Brisca
- Unit of Pediatric Neurology and Muscular Disorders, Istituto G.Gaslini, Genoa, Italy.,Department of Neuroscience, Center of Myology and Neurodegenerative Disorders, Istituto Giannina Gaslini, Genoa, Italy
| | - F Trucco
- Unit of Pediatric Neurology and Muscular Disorders, Istituto G.Gaslini, Genoa, Italy
| | - M Pedemonte
- Unit of Pediatric Neurology and Muscular Disorders, Istituto G.Gaslini, Genoa, Italy
| | - R Trovato
- IRCCS Stella Maris, Molecular Medicine and Neuromuscular Disorders, Via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - L Ruggiero
- Department of Neurosciences and Reproductive and Odontostomatologic Sciences, University Federico II, Naples, Italy
| | - L Vercelli
- Department of Neurosciences "Rita Levi Montalcini", University of Turin, Turin, Italy
| | - A D'Amico
- Unit of Neuromuscular and Neurodegenerative Disorders, Department of Neurosciences, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - G Tasca
- Don Carlo Gnocchi ONLUS Foundation, Rome, Italy
| | - M Pane
- Department of Paediatric Neurology, Catholic University, Rome, Italy
| | - M Fanin
- Department of Neurosciences, University of Padua, Padua, Italy
| | - L Bello
- Department of Neurosciences, University of Padua, Padua, Italy
| | - P Broda
- Unit of Pediatric Neurology and Muscular Disorders, Istituto G.Gaslini, Genoa, Italy
| | - O Musumeci
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - C Rodolico
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - S Messina
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - G L Vita
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - M Sframeli
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - S Gibertini
- Neuromuscular Diseases and Neuroimmunology Unit, IRCCS Foundation C Besta Neurological Institute, Milan, Italy
| | - L Morandi
- Neuromuscular Diseases and Neuroimmunology Unit, IRCCS Foundation C Besta Neurological Institute, Milan, Italy
| | - M Mora
- Neuromuscular Diseases and Neuroimmunology Unit, IRCCS Foundation C Besta Neurological Institute, Milan, Italy
| | - L Maggi
- Neuromuscular Diseases and Neuroimmunology Unit, IRCCS Foundation C Besta Neurological Institute, Milan, Italy
| | - A Petrucci
- Center for Neuromuscular and Neurological Rare Diseases, S. Camillo-Forlanini Hospital, Rome, Italy
| | - R Massa
- Department of Systems Medicine (Neurology), University of Tor Vergata, Rome, Italy
| | - M Grandis
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternad and Child Health, University of Genova, University of Genoa, Genoa, Italy
| | - A Toscano
- Department of Clinical and Experimental Medicine and Nemo Sud Clinical Centre, University of Messina, Messina, Italy
| | - E Pegoraro
- Department of Neurosciences, University of Padua, Padua, Italy
| | - E Mercuri
- Department of Paediatric Neurology, Catholic University, Rome, Italy
| | - E Bertini
- Unit of Neuromuscular and Neurodegenerative Disorders, Department of Neurosciences, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - T Mongini
- Department of Neurosciences "Rita Levi Montalcini", University of Turin, Turin, Italy
| | - L Santoro
- Department of Neurosciences and Reproductive and Odontostomatologic Sciences, University Federico II, Naples, Italy
| | - V Nigro
- Telethon Institute of Genetics and Medicine, Naples, Italy
| | - C Minetti
- Unit of Pediatric Neurology and Muscular Disorders, Istituto G.Gaslini, Genoa, Italy.,Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternad and Child Health, University of Genova, University of Genoa, Genoa, Italy
| | - F M Santorelli
- IRCCS Stella Maris, Molecular Medicine and Neuromuscular Disorders, Via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - C Bruno
- Department of Neuroscience, Center of Myology and Neurodegenerative Disorders, Istituto Giannina Gaslini, Genoa, Italy
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Brand P, Dyck PJB, Liu J, Berini S, Selcen D, Milone M. Distal myopathy with coexisting heterozygous TIA1 and MYH7 Variants. Neuromuscul Disord 2016; 26:511-5. [PMID: 27282841 DOI: 10.1016/j.nmd.2016.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 04/28/2016] [Accepted: 05/19/2016] [Indexed: 01/20/2023]
Abstract
TIA1 mutations cause Welander distal myopathy. MYH7 mutations result in various clinical phenotypes, including Laing distal myopathy and cardiomyopathy. We describe a family with coexisting TIA1 and MYH7 variants. The proband is a 67-year-old woman with easy tripping since childhood and progressive asymmetric distal limb weakness, but no cardiac involvement. Muscle biopsy showed rare rimmed vacuoles, minicore-like structures and congophilic inclusions. Her 66-year-old sister has a mild distal myopathy, supraventricular tachycardia and hypertrophic cardiomyopathy. Both sisters carry the only known pathogenic TIA1 mutation and a heterozygous MYH7 variant (c.5459G > A; p.Arg1820Gln). Another sibling with isolated distal myopathy carries only the TIA1 mutation. MYH7 p.Arg1820Gln involves a highly conserved residue and is predicted to be deleterious. Furthermore, the proband's childhood-onset distal leg weakness and sister's cardiomyopathy suggest that MYH7 p.Arg1820Gln likely affects function, favoring a digenic etiology of the myopathy.
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Affiliation(s)
- Patricio Brand
- Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA
| | - P James B Dyck
- Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA
| | - Jie Liu
- PreventionGenetics, 3800 S. Business Park Ave, Marshfield, Wisconsin 54449, USA; Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Sarah Berini
- Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA
| | - Duygu Selcen
- Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA
| | - Margherita Milone
- Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA.
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Astrea G, Petrucci A, Cassandrini D, Savarese M, Trovato R, Lispi L, Rubegni A, Giacanelli M, Massa R, Nigro V, Santorelli FM. Myoimaging in the NGS era: the discovery of a novel mutation in MYH7 in a family with distal myopathy and core-like features--a case report. BMC MEDICAL GENETICS 2016; 17:25. [PMID: 27005958 PMCID: PMC4804697 DOI: 10.1186/s12881-016-0288-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 03/11/2016] [Indexed: 11/22/2022]
Abstract
Background Myosin heavy chain 7 related myopathies are rare disorders characterized by a wide phenotypic spectrum and heterogeneous pathological features. In the present study, we performed clinical, morphological, genetic and imaging investigations in three relatives affected by autosomal dominant distal myopathy. Whilst earlier traditional Sanger investigations had pointed to the wrong gene as disease causative, next-generation sequencing allowed us to obtain the definitive molecular genetic diagnosis in the family. Case presentation The proposita, being found to harbor a novel heterozygous mutation in the RYR1 gene (p.Glu294Lys), was initially diagnosed with core myopathy. Subsequently, consideration of muscle magnetic resonance imaging (MRI) features and extension of family study led this diagnosis to be questioned. Use of next-generation sequencing analysis identified a novel mutation in the MYH7gene (p.Ser1435Pro) that segregated in the affected family members. Conclusions This study identified a novel mutation in MYH7 in a family where the conclusive molecular diagnosis was reached through a complicated path. This case report might raise awareness, among clinicians, of the need to interpret NGS data in combination with muscle MRI patterns so as to facilitate the pinpointing of the main molecular etiology in inherited muscle disorders. Electronic supplementary material The online version of this article (doi:10.1186/s12881-016-0288-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Guja Astrea
- Molecular Medicine, IRCCS Stella Maris, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - Antonio Petrucci
- Center for Neuromuscular and Neurological Rare Diseases, S. Camillo-Forlanini Hospital, Rome, Italy
| | - Denise Cassandrini
- Molecular Medicine, IRCCS Stella Maris, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - Marco Savarese
- Department of Biochemistry, Biophysics and General Pathology (Medical Genetics), Second University of Naples, Naples, Italy
| | - Rosanna Trovato
- Molecular Medicine, IRCCS Stella Maris, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - Ludovico Lispi
- Center for Neuromuscular and Neurological Rare Diseases, S. Camillo-Forlanini Hospital, Rome, Italy
| | - Anna Rubegni
- Molecular Medicine, IRCCS Stella Maris, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy
| | - Manlio Giacanelli
- Center for Neuromuscular and Neurological Rare Diseases, S. Camillo-Forlanini Hospital, Rome, Italy
| | - Roberto Massa
- Department of Systems Medicine (Neurology), University of Tor Vergata, Rome, Italy
| | - Vincenzo Nigro
- Department of Biochemistry, Biophysics and General Pathology (Medical Genetics), Second University of Naples, Naples, Italy.,Telethon Institute of Genetics and Medicine, Naples, Italy
| | - Filippo M Santorelli
- Molecular Medicine, IRCCS Stella Maris, via dei Giacinti 2, 56128, Calambrone, Pisa, Italy.
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Davignon L, Chauveau C, Julien C, Dill C, Duband-Goulet I, Cabet E, Buendia B, Lilienbaum A, Rendu J, Minot MC, Guichet A, Allamand V, Vadrot N, Fauré J, Odent S, Lazaro L, Leroy JP, Marcorelles P, Dubourg O, Ferreiro A. The transcription coactivator ASC-1 is a regulator of skeletal myogenesis, and its deficiency causes a novel form of congenital muscle disease. Hum Mol Genet 2016; 25:1559-73. [PMID: 27008887 DOI: 10.1093/hmg/ddw033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Accepted: 02/04/2016] [Indexed: 01/17/2023] Open
Abstract
Despite recent progress in the genetic characterization of congenital muscle diseases, the genes responsible for a significant proportion of cases remain unknown. We analysed two branches of a large consanguineous family in which four patients presented with a severe new phenotype, clinically marked by neonatal-onset muscle weakness predominantly involving axial muscles, life-threatening respiratory failure, skin abnormalities and joint hyperlaxity without contractures. Muscle biopsies showed the unreported association of multi-minicores, caps and dystrophic lesions. Genome-wide linkage analysis followed by gene and exome sequencing in patients identified a homozygous nonsense mutation in TRIP4 encoding Activating Signal Cointegrator-1 (ASC-1), a poorly characterized transcription coactivator never associated with muscle or with human inherited disease. This mutation resulted in TRIP4 mRNA decay to around 10% of control levels and absence of detectable protein in patient cells. ASC-1 levels were higher in axial than in limb muscles in mouse, and increased during differentiation in C2C12 myogenic cells. Depletion of ASC-1 in cultured muscle cells from a patient and in Trip4 knocked-down C2C12 led to a significant reduction in myotube diameter ex vivo and in vitro, without changes in fusion index or markers of initial myogenic differentiation. This work reports the first TRIP4 mutation and defines a novel form of congenital muscle disease, expanding their histological, clinical and molecular spectrum. We establish the importance of ASC-1 in human skeletal muscle, identify transcriptional co-regulation as novel pathophysiological pathway, define ASC-1 as a regulator of late myogenic differentiation and suggest defects in myotube growth as a novel myopathic mechanism.
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Affiliation(s)
- Laurianne Davignon
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France, Inserm U787, Myology Group, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France, UPMC, UMR787, 75013 Paris, France
| | - Claire Chauveau
- Inserm U787, Myology Group, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France, UPMC, UMR787, 75013 Paris, France
| | - Cédric Julien
- Inserm U787, Myology Group, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France, UPMC, UMR787, 75013 Paris, France
| | - Corinne Dill
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - Isabelle Duband-Goulet
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - Eva Cabet
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - Brigitte Buendia
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - Alain Lilienbaum
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - John Rendu
- Université Grenoble Alpes, Université Joseph Fourier, 38041 Grenoble, France, Biochimie Génétique et Moléculaire, CHRU de Grenoble, 38700 Grenoble, France, INSERM U386, Equipe Muscle et Pathologies, Grenoble Institut des Neurosciences, 38700 Grenoble, France
| | | | - Agnès Guichet
- CHU Angers, Service de génétique médicale, 49100 Angers, France
| | - Valérie Allamand
- UPMC, Inserm UMRS974, CNRS FRE3617, Center for Research in Myology, 75013 Paris, France
| | - Nathalie Vadrot
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France
| | - Julien Fauré
- Université Grenoble Alpes, Université Joseph Fourier, 38041 Grenoble, France, Biochimie Génétique et Moléculaire, CHRU de Grenoble, 38700 Grenoble, France, INSERM U386, Equipe Muscle et Pathologies, Grenoble Institut des Neurosciences, 38700 Grenoble, France
| | - Sylvie Odent
- Pôle Neurosciences, Service de Neurologie, CHU de Rennes, 35033 Rennes, France
| | - Leïla Lazaro
- Service de Pédiatrie, Centre Hospitalier de la Côte Basque, 64109 Bayonne, France
| | - Jean Paul Leroy
- Laboratoire d'Anatomo-Pathologie, CHU de Brest, 29609 Brest, France
| | - Pascale Marcorelles
- Laboratoire d'Anatomo-Pathologie, CHU de Brest, 29609 Brest, France, EA 4685 Laboratoire de Neuroscience de Brest, Université Bretagne Occidentale, 29200 Brest, France
| | - Odile Dubourg
- Inserm U787, Myology Group, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France, UPMC, UMR787, 75013 Paris, France, AP-HP, Laboratoire de Neuropathologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France and
| | - Ana Ferreiro
- Pathophysiology of Striated Muscles Laboratory, Unit of Functional and Adaptive Biology (BFA), University Paris Diderot, Sorbonne Paris Cité, BFA, UMR CNRS 8251, 75250 Paris Cedex 13, France, Inserm U787, Myology Group, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France, UPMC, UMR787, 75013 Paris, France, AP-HP, Centre de Référence Maladies Neuromusculaires Paris-Est, Groupe Hospitalier Pitié-Salpêtrière, 75013 Paris, France
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Two families with MYH7 distal myopathy associated with cardiomyopathy and core formations. J Clin Neuromuscul Dis 2015; 16:164-9. [PMID: 25695922 DOI: 10.1097/cnd.0000000000000069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
INTRODUCTION Laing distal myopathy is caused by MYH7 gene mutations. Multiple families have been reported with varying patterns of skeletal and cardiac involvement as well as histopathological findings. CASE SERIES We report 2 families with p.Glu1508del mutation with detailed electrophysiological and muscle pathology findings. RESULTS All patients displayed the classic phenotype with weakness starting in the anterior compartment of the legs with a "hanging great toe." It was followed by finger extensors involvement, relatively sparing the extensor indicis proprius, giving the appearance of a "pointing index" finger. All the affected individuals had a dilated cardiomyopathy and core formations on muscle biopsy. Unexpectedly, neurogenic changes were also observed in some individuals. Both families were initially misdiagnosed with either central core disease or hereditary neuropathy. CONCLUSIONS Recognizing the classic phenotype, screening for cardiac involvement that may be clinically silent, and determining the mode of inheritance help with selecting the appropriate genetic test.
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A de novo mutation of the MYH7 gene in a large Chinese family with autosomal dominant myopathy. Hum Genome Var 2015; 2:15022. [PMID: 27081534 PMCID: PMC4785580 DOI: 10.1038/hgv.2015.22] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 04/24/2015] [Accepted: 05/11/2015] [Indexed: 02/07/2023] Open
Abstract
Laing distal myopathy (LDM) is an autosomal dominant myopathy that is caused by mutations in the slow/beta cardiac myosin heavy-chain (MYH7) gene. It has been recently reported that LDM presents with a wide range of clinical manifestations. We herein report a large Chinese family with autosomal dominant myopathy. The affected individuals in the family presented with foot drop in early childhood, along with progressive distal and proximal limb weakness. Their characteristic symptoms include scapular winging and scoliosis in the early disease phase and impairment of ambulation in the advanced phase. Although limb-girdle muscle dystrophy (LGMD) was suspected initially, a definite diagnosis could not be reached. As such, we performed linkage analysis and detected four linkage regions, namely 1q23.2-24.1, 14q11.2-12, 15q26.2-26.3 and 17q24.3. Through subsequent whole exome sequencing, we found a de novo p.K1617del causative mutation in the MYH7 gene and diagnosed the disease as LDM. This is the first LDM case in China. Our patients have severe clinical manifestations that mimic LGMD in comparison with the patients with the same mutation reported elsewhere.
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38
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Reis GF, de la Motte G, Gooding R, Laing NG, Margeta M. Complex sarcolemmal invaginations mimicking myotendinous junctions in a case of Laing early-onset distal myopathy. Neuropathology 2015; 35:575-81. [DOI: 10.1111/neup.12220] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 04/20/2015] [Accepted: 04/21/2015] [Indexed: 02/01/2023]
Affiliation(s)
- Gerald F. Reis
- Department of Pathology; University of California; San Francisco CA USA
| | | | - Rebecca Gooding
- Neurogenetics Unit, PathWest Laboratory Medicine; QEII Medical Centre; Nedlands WA Australia
| | - Nigel G. Laing
- Centre for Medical Research, University of Western Australia and Harry Perkins Institute of Medical Research, QEII Medical Centre; Nedlands WA Australia
| | - Marta Margeta
- Department of Pathology; University of California; San Francisco CA USA
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Lefter S, Hardiman O, McLaughlin RL, Murphy SM, Farrell M, Ryan AM. A novel MYH7 Leu1453pro mutation resulting in Laing distal myopathy in an Irish family. Neuromuscul Disord 2015; 25:155-60. [DOI: 10.1016/j.nmd.2014.09.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 08/24/2014] [Accepted: 09/17/2014] [Indexed: 12/12/2022]
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40
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Homozygous MYH7 R1820W mutation results in recessive myosin storage myopathy: scapuloperoneal and respiratory weakness with dilated cardiomyopathy. Neuromuscul Disord 2015; 25:340-4. [PMID: 25666907 DOI: 10.1016/j.nmd.2015.01.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/13/2015] [Accepted: 01/20/2015] [Indexed: 01/28/2023]
Abstract
Myosin storage myopathy (MSM) is a protein aggregate myopathy caused by the accumulation of myosin in muscle fibres and results from MYH7 mutation. Although MYH7 mutation is also an established cause of variable cardiomyopathy with or without skeletal myopathy, cardiomyopathy with MSM is a rare combination. Here, we update the clinical findings in the two brothers that we previously reported as having recessively inherited MSM characterized by scapuloperoneal distribution of weakness and typical hyaline-like bodies in type 1 muscle fibres. One of the patients, weak from childhood but not severely symptomatic until 28 years of age, had an unusual combination of MSM, severe dilated cardiomyopathy, and respiratory impairment at the age of 44 years. We identified homozygous missense mutation c.5458C>T (p.R1820W) in exon 37 in these patients as the second recessive MYH7 mutation reported to date.
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41
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A rare mutation in MYH7 gene occurs with overlapping phenotype. Biochem Biophys Res Commun 2015; 457:262-6. [PMID: 25576864 DOI: 10.1016/j.bbrc.2014.12.098] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 12/22/2014] [Indexed: 01/22/2023]
Abstract
Mutations in the beta-myosin heavy chain gene (MYH7) cause different muscle disorders. The specific molecular pathobiological processes that cause these different phenotypes remains unexplained. We describe three members of a family with an autosomal dominant mutation in the distal rod of MYH7 [c.5401G> A (p.Glu1801Lys)] displaying a complex phenotype characterized by Laing Distal Myopathy like phenotype, left ventricular non compaction cardiomyopathy and Fiber Type Disproportion picture at muscle biopsy. We suggest that this overlapping presentation confirm the phenotypic variability of MYH7 myopathy and may be helpful to improve the genotype phenotype correlation.
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Ravenscroft G, Laing NG, Bönnemann CG. Pathophysiological concepts in the congenital myopathies: blurring the boundaries, sharpening the focus. ACTA ACUST UNITED AC 2014; 138:246-68. [PMID: 25552303 DOI: 10.1093/brain/awu368] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The congenital myopathies are a diverse group of genetic skeletal muscle diseases, which typically present at birth or in early infancy. There are multiple modes of inheritance and degrees of severity (ranging from foetal akinesia, through lethality in the newborn period to milder early and later onset cases). Classically, the congenital myopathies are defined by skeletal muscle dysfunction and a non-dystrophic muscle biopsy with the presence of one or more characteristic histological features. However, mutations in multiple different genes can cause the same pathology and mutations in the same gene can cause multiple different pathologies. This is becoming ever more apparent now that, with the increasing use of next generation sequencing, a genetic diagnosis is achieved for a greater number of patients. Thus, considerable genetic and pathological overlap is emerging, blurring the classically established boundaries. At the same time, some of the pathophysiological concepts underlying the congenital myopathies are moving into sharper focus. Here we explore whether our emerging understanding of disease pathogenesis and underlying pathophysiological mechanisms, rather than a strictly gene-centric approach, will provide grounds for a different and perhaps complementary grouping of the congenital myopathies, that at the same time could help instil the development of shared potential therapeutic approaches. Stemming from recent advances in the congenital myopathy field, five key pathophysiology themes have emerged: defects in (i) sarcolemmal and intracellular membrane remodelling and excitation-contraction coupling; (ii) mitochondrial distribution and function; (iii) myofibrillar force generation; (iv) atrophy; and (v) autophagy. Based on numerous emerging lines of evidence from recent studies in cell lines and patient tissues, mouse models and zebrafish highlighting these unifying pathophysiological themes, here we review the congenital myopathies in relation to these emerging pathophysiological concepts, highlighting both areas of overlap between established entities, as well as areas of distinction within single gene disorders.
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Affiliation(s)
- Gianina Ravenscroft
- 1 Harry Perkins Institute of Medical Research, Centre for Medical Research, University of Western Australia, Nedlands, Western Australia, Australia
| | - Nigel G Laing
- 1 Harry Perkins Institute of Medical Research, Centre for Medical Research, University of Western Australia, Nedlands, Western Australia, Australia
| | - Carsten G Bönnemann
- 2 National Institute of Neurological Disorders and Stroke/NIH, Porter Neuroscience Research Centre, Bethesda, MD, USA
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Laing early-onset distal myopathy in a Belgian family. Acta Neurol Belg 2014; 114:253-6. [PMID: 24710723 DOI: 10.1007/s13760-014-0298-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 03/24/2014] [Indexed: 10/25/2022]
Abstract
We report the first Belgian family with Laing early-onset distal myopathy (MPD1). The proposita started limping at age 7. Later, there was severe weakness of proximal and distal muscles, including neck flexors. Her daughter developed foot drop at age 4. Progressive weakness of distal limb extensor muscles and mild weakness of the neck flexor and proximal muscles were noted. In both patients, CK and nerve conductions were normal, but EMG showed a brief, small amplitude, abundant, polyphasic potential pattern. Heart and respiration were normal. Several muscle biopsies have been performed in each with various diagnoses, including aspecific myopathic changes, congenital fibre type disproportion, and denervation-reinnervation. Analysis of MYH7 revealed a c.4522_4524del mutation (p.Glu1508del). This appears to be a de novo mutation, which has been reported in French, Norwegian, and Finnish patients.
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Roda RH, Schindler AB, Blackstone C, Mammen AL, Corse AM, Lloyd TE. Laing distal myopathy pathologically resembling inclusion body myositis. Ann Clin Transl Neurol 2014; 1:1053-8. [PMID: 25574480 PMCID: PMC4284131 DOI: 10.1002/acn3.140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 10/13/2014] [Accepted: 10/14/2014] [Indexed: 11/18/2022] Open
Abstract
Mutations in MYH7 cause autosomal dominant Laing distal myopathy. We present a family with a previously reported deletion (c.5186_5188delAGA, p.K1729del). Muscle pathology in one family member was characterized by an inflammatory myopathy with rimmed vacuoles, increased MHC Class I expression, and perivascular and endomysial muscle inflammation comprising CD3+, CD4+, CD8+, and CD68+ inflammatory cells. Interestingly, this biopsy specimen contained TDP-43, p62, and SMI-31-positive protein aggregates typical of inclusion body myositis. These findings should alert physicians to the possibility that patients with MYH7 mutations may have muscle biopsies showing pathologic findings similar to inclusion body myositis.
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Affiliation(s)
- Ricardo H Roda
- Neuromuscular Disorders and Neurogenetics Divisions, Department of Neurology, New York University Langone Medical Center New York, New York ; Cell Biology Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health Bethesda, Maryland
| | - Alice B Schindler
- Hereditary Neurological Diseases Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health Bethesda, Maryland
| | - Craig Blackstone
- Cell Biology Section, Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health Bethesda, Maryland
| | - Andrew L Mammen
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, Maryland ; Department of Medicine, Johns Hopkins University School of Medicine Baltimore, Maryland ; Muscle Disease Unit, Laboratory of Muscle Stem Cells and Gene Regulation, National Institutes of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health Bethesda, Maryland
| | - Andrea M Corse
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, Maryland
| | - Thomas E Lloyd
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, Maryland ; Department of Neuroscience, Johns Hopkins University School of Medicine Baltimore, Maryland
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Romero NB, Xie T, Malfatti E, Schaeffer U, Böhm J, Wu B, Xu F, Boucebci S, Mathis S, Neau JP, Monnier N, Fardeau M, Laporte J. Autosomal dominant eccentric core disease caused by a heterozygous mutation in the MYH7 gene. J Neurol Neurosurg Psychiatry 2014; 85:1149-52. [PMID: 24828896 PMCID: PMC4173876 DOI: 10.1136/jnnp-2013-306754] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Autosomal dominant (AD) central core disease (CCD) is a congenital myopathy characterised by the presence of cores in the muscle fibres which correspond to broad areas of myofibrils disorganisation, Z-line streaming and lack of mitochondria. Heterozygous mutations in the RYR1 gene were observed in the large majority of AD-CCD families; however, this gene was excluded in some of AD-CCD families. OBJECTIVE To enlarge the genetic spectrum of AD-CCD demonstrating mutations in an additional gene. PATIENTS AND METHODS Four affected AD family members over three generations, three of whom were alive and participate in the study: the mother and two of three siblings. The symptoms began during the early childhood with mild delayed motor development. Later they developed mainly tibialis anterior weakness, hypertrophy of calves and significant weakness (amyotrophic) of quadriceps. No cardiac or ocular involvement was noted. RESULTS The muscle biopsies sections showed a particular pattern: eccentric cores in type 1 fibres, associated with type 1 predominance. Most cores have abrupt borders. Electron microscopy confirmed the presence of both unstructured and structured cores. Exome sequencing analysis identified a novel heterozygous missense mutation p.Leu1723Pro in MYH7 segregating with the disease and affecting a conserved residue in the myosin tail domain. CONCLUSIONS We describe MYH7 as an additional causative gene for AD-CCD. These findings have important implications for diagnosis and future investigations of AD-congenital myopathies with cores, without cardiomyopathy, but presenting a particular involvement of distal and quadriceps muscles.
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Affiliation(s)
- Norma B Romero
- Neuromuscular Morphology Unit, Myology Institute, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, Paris, France Inserm, U974, Paris, France University Pierre et Marie Curie- Paris 6, UM 76, CNRS, UMR 7215, Myology Institute, IFR14, Paris, France Centre de référence de Pathologie Neuromusculaire Paris-Est, Institut de Myologie, GHU La Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Ting Xie
- Department of Translational Medicine and Neurogenetics, IGBMC, Illkirch, France Inserm, U964, Illkirch, France CNRS, UMR7104, Illkirch, France Université de Strasbourg, Illkirch, France Collège de France, chaire de génétique humaine, Illkirch, France
| | - Edoardo Malfatti
- Neuromuscular Morphology Unit, Myology Institute, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, Paris, France Inserm, U974, Paris, France University Pierre et Marie Curie- Paris 6, UM 76, CNRS, UMR 7215, Myology Institute, IFR14, Paris, France Centre de référence de Pathologie Neuromusculaire Paris-Est, Institut de Myologie, GHU La Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Paris, France Department of Neurological, Neurosurgical, and Behavioral Sciences, University of Siena, Siena, Italy
| | - Ursula Schaeffer
- Department of Translational Medicine and Neurogenetics, IGBMC, Illkirch, France Inserm, U964, Illkirch, France CNRS, UMR7104, Illkirch, France Université de Strasbourg, Illkirch, France Collège de France, chaire de génétique humaine, Illkirch, France
| | - Johann Böhm
- Department of Translational Medicine and Neurogenetics, IGBMC, Illkirch, France Inserm, U964, Illkirch, France CNRS, UMR7104, Illkirch, France Université de Strasbourg, Illkirch, France Collège de France, chaire de génétique humaine, Illkirch, France
| | - Bin Wu
- BGI-Shenzhen, Shenzhen, China
| | | | - Samy Boucebci
- Service de Neurologie and Pôle Imagerie, Centre Hospitalier Universitaire de Poitiers, Poitiers, France
| | - Stéphane Mathis
- Service de Neurologie and Pôle Imagerie, Centre Hospitalier Universitaire de Poitiers, Poitiers, France
| | - Jean-Philippe Neau
- Service de Neurologie and Pôle Imagerie, Centre Hospitalier Universitaire de Poitiers, Poitiers, France
| | - Nicole Monnier
- Laboraroire de Biochimie et Génétique moléculaire, IBP, CHU Grenoble, Grenoble, France
| | - Michel Fardeau
- Neuromuscular Morphology Unit, Myology Institute, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, Paris, France University Pierre et Marie Curie- Paris 6, UM 76, CNRS, UMR 7215, Myology Institute, IFR14, Paris, France
| | - Jocelyn Laporte
- Department of Translational Medicine and Neurogenetics, IGBMC, Illkirch, France Inserm, U964, Illkirch, France CNRS, UMR7104, Illkirch, France Université de Strasbourg, Illkirch, France Collège de France, chaire de génétique humaine, Illkirch, France
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Finsterer J, Brandau O, Stöllberger C, Wallefeld W, Laing NG, Laccone F. Distal myosin heavy chain-7 myopathy due to the novel transition c.5566G>A (p.E1856K) with high interfamilial cardiac variability and putative anticipation. Neuromuscul Disord 2014; 24:721-5. [PMID: 24953931 DOI: 10.1016/j.nmd.2014.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 05/17/2014] [Accepted: 05/21/2014] [Indexed: 11/25/2022]
Abstract
Myosin-heavy-chain 7 (MYH7)-myopathy manifests clinically with a distal, scapuloperoneal, limb-girdle (proximal), or axial distribution and may involve the respiratory muscles. Cardiac involvement is frequent, ranging from relaxation impairment to severe dilative cardiomyopathy. Progression and earlier onset of cardiac disease in successive generations with MYH7-myopathy is unreported. In a five-generation family MYH7-myopathy due to the novel c.5566G > A (p.E1856K) mutation manifested with late-onset, distal > proximal myopathy and variable degree of cardiac involvement. The index patient developed distal myopathy since age 49 y and anginal chest pain. Her mother had distal myopathy and impaired myocardial relaxation. The daughter of the index patient had discrete myopathy but left ventricular hypertrabeculation/noncompaction and ventricular arrhythmias requiring an implantable cardioverter defibrillator. The granddaughter of the index patient had infantile dilated cardiomyopathy without overt myopathy. Cardiac involvement may be present in MYH7-myopathy and may be progressive between the generations, ranging from relaxation abnormality to noncompaction, ventricular arrhythmias, and dilated cardiomyopathy.
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Affiliation(s)
| | - Oliver Brandau
- Institute of Medical Genetics, Medical University of Vienna, Währinger Strasse 10, 1090 Vienna, Austria
| | - Claudia Stöllberger
- 2nd Medical Department with Cardiology and Intensive Care Medicine Krankenanstalt Rudolfstiftung, Vienna, Austria
| | - William Wallefeld
- Centre for Medical Research, University of Western Australia and Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia 6009, Australia
| | - Nigel G Laing
- Centre for Medical Research, University of Western Australia and Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia 6009, Australia
| | - Franco Laccone
- Institute of Medical Genetics, Medical University of Vienna, Währinger Strasse 10, 1090 Vienna, Austria
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Lamont PJ, Wallefeld W, Hilton-Jones D, Udd B, Argov Z, Barboi AC, Bonneman C, Boycott KM, Bushby K, Connolly AM, Davies N, Beggs AH, Cox GF, Dastgir J, DeChene ET, Gooding R, Jungbluth H, Muelas N, Palmio J, Penttilä S, Schmedding E, Suominen T, Straub V, Staples C, Van den Bergh PYK, Vilchez JJ, Wagner KR, Wheeler PG, Wraige E, Laing NG. Novel mutations widen the phenotypic spectrum of slow skeletal/β-cardiac myosin (MYH7) distal myopathy. Hum Mutat 2014; 35:868-79. [PMID: 24664454 DOI: 10.1002/humu.22553] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 03/10/2014] [Indexed: 01/01/2023]
Abstract
Laing early onset distal myopathy and myosin storage myopathy are caused by mutations of slow skeletal/β-cardiac myosin heavy chain encoded by the gene MYH7, as is a common form of familial hypertrophic/dilated cardiomyopathy. The mechanisms by which different phenotypes are produced by mutations in MYH7, even in the same region of the gene, are not known. To explore the clinical spectrum and pathobiology, we screened the MYH7 gene in 88 patients from 21 previously unpublished families presenting with distal or generalized skeletal muscle weakness, with or without cardiac involvement. Twelve novel mutations have been identified in thirteen families. In one of these families, the father of the proband was found to be a mosaic for the MYH7 mutation. In eight cases, de novo mutation appeared to have occurred, which was proven in four. The presenting complaint was footdrop, sometimes leading to delayed walking or tripping, in members of 17 families (81%), with other presentations including cardiomyopathy in infancy, generalized floppiness, and scoliosis. Cardiac involvement as well as skeletal muscle weakness was identified in nine of 21 families. Spinal involvement such as scoliosis or rigidity was identified in 12 (57%). This report widens the clinical and pathological phenotypes, and the genetics of MYH7 mutations leading to skeletal muscle diseases.
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Affiliation(s)
- Phillipa J Lamont
- Neurogenetic Unit, Department of Neurology, Royal Perth Hospital, Western Australia, Australia; Diagnostic Genomics Laboratory, Pathwest, Queen Elizabeth II Medical Centre, Nedlands, Western Australia, Australia
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Finsterer J, Stöllberger C, Brandau O, Laccone F, Bichler K, Laing NG. Novel MYH7 mutation associated with mild myopathy but life-threatening ventricular arrhythmias and noncompaction. Int J Cardiol 2014; 173:532-5. [DOI: 10.1016/j.ijcard.2014.03.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Accepted: 03/09/2014] [Indexed: 11/27/2022]
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49
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Exome sequencing identifies Laing distal myopathy MYH7 mutation in a Roma family previously diagnosed with distal neuronopathy. Neuromuscul Disord 2014; 24:156-61. [DOI: 10.1016/j.nmd.2013.10.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 10/08/2013] [Accepted: 10/31/2013] [Indexed: 11/22/2022]
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