1
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Borch JDS, Krag T, Holm-Yildiz SD, Cetin H, Solheim TA, Fornander F, Straub V, Duno M, Vissing J. Three novel FHL1 Variants cause a mild Phenotype of Emery-Dreifuss Muscular Dystrophy. Hum Mutat 2022; 43:1234-1238. [PMID: 35607917 PMCID: PMC9545859 DOI: 10.1002/humu.24415] [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: 11/26/2021] [Revised: 04/14/2022] [Accepted: 05/22/2022] [Indexed: 11/11/2022]
Abstract
Emery-Dreifuss muscular dystrophy (EDMD) is a hereditary muscle disease, characterized by the clinical triade of early-onset joint contractures, progressive muscle weakness and cardiac involvement. Pathogenic variants in FHL1 can cause a rare X-linked recessive form of EDMD, type 6. We report three men with novel variants in FHL1 leading to EDMD6. Onset of muscle symptoms was in late adulthood and muscle weakness was not prominent in either of the patients. All patients had hypertrophic cardiomyopathy and one of them also had cardiac arrhythmias. Western blot performed on muscle biopsies from two of the patients showed no FHL1 protein expression. We predict that the variant in the third patient also leads to absence of FHL1 protein. Complete loss of all FHL1 isoforms combined with mild muscle involvement supports the hypothesis that loss of all FHL1 isoforms is more benign than the cytotoxic effects of expressed FHL1 protein with pathogenic missense variants. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Josefine D S Borch
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
| | - Thomas Krag
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
| | - Sonja D Holm-Yildiz
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
| | - Hakan Cetin
- Department of Neurology, Medical University of Vienna, Austria
| | - Tuva A Solheim
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
| | - Freja Fornander
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
| | - Volker Straub
- John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, NE1 3BZ, UK
| | - Morten Duno
- Department of Clinical Genetics, section 4062, Rigshospitalet, University of Copenhagen, Denmark
| | - John Vissing
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Denmark
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2
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Heller SA, Shih R, Kalra R, Kang PB. Emery-Dreifuss muscular dystrophy. Muscle Nerve 2019; 61:436-448. [PMID: 31840275 PMCID: PMC7154529 DOI: 10.1002/mus.26782] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 12/04/2019] [Accepted: 12/07/2019] [Indexed: 12/19/2022]
Abstract
Emery-Dreifuss muscular dystrophy (EDMD) is a rare muscular dystrophy, but is particularly important to diagnose due to frequent life-threatening cardiac complications. EDMD classically presents with muscle weakness, early contractures, cardiac conduction abnormalities and cardiomyopathy, although the presence and severity of these manifestations vary by subtype and individual. Associated genes include EMD, LMNA, SYNE1, SYNE2, FHL1, TMEM43, SUN1, SUN2, and TTN, encoding emerin, lamin A/C, nesprin-1, nesprin-2, FHL1, LUMA, SUN1, SUN2, and titin, respectively. The Online Mendelian Inheritance in Man database recognizes subtypes 1 through 7, which captures most but not all of the associated genes. Genetic diagnosis is essential whenever available, but traditional diagnostic tools can help steer the evaluation toward EDMD and assist with interpretation of equivocal genetic test results. Management is primarily supportive, but it is important to monitor patients closely, especially for potential cardiac complications. There is a high potential for progress in the treatment of EDMD in the coming years.
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Affiliation(s)
- Scott A Heller
- Department of Neurology, University of Florida College of Medicine, Gainesville, Florida
| | - Renata Shih
- Congenital Heart Center, University of Florida College of Medicine, Gainesville, Florida
| | - Raghav Kalra
- Division of Pediatric Neurology, Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida
| | - Peter B Kang
- Department of Neurology, University of Florida College of Medicine, Gainesville, Florida.,Division of Pediatric Neurology, Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida.,Genetics Institute and Myology Institute, University of Florida, Gainesville, Florida
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3
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Chen T, Lu X, Shi Q, Guo J, Wang H, Wang Q, Yin X, Zhang Y, Pu C, Zhou D. FHL1-related myopathy may not be classified by reducing bodies in muscle biopsy. Neuromuscul Disord 2019; 30:165-172. [PMID: 32001145 DOI: 10.1016/j.nmd.2019.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 11/05/2019] [Accepted: 11/24/2019] [Indexed: 02/08/2023]
Abstract
FHL1-related myopathies, including reducing body myopathy (RBM), X-linked scapulo-axio-peroneal myopathy, rigid spine syndrome, X-linked myopathy with postural muscle atrophy (XMPMA), X-linked Emery-Dreifuss muscular dystrophy and hypertrophic cardiomyopathy, are clinically and pathologically heterogeneous disorders caused by FHL1 gene mutations. According to previous reports, the first three types are myopathies with reducing bodies observed in biopsies, and the last three are myopathies without reducing bodies. We report four FHL1-related myopathy patients, including an XMPMA patient and a RBM family with three patients. Clinical information, muscle biopsies, electromyograms and genetic testing were obtained. Muscle weakness and atrophy, spinal rigidity, and joint contracture were present in the RBM family. The XMPMA patient showed a pseudoathletic appearance with muscle weakness and atrophy, spinal rigidity and deformity. The index patient of the RBM family underwent two muscle biopsies to find reducing bodies. Interestingly, these muscle biopsies revealed reducing bodies and rimmed vacuoles not only in the RBM family but also in the XMPMA patient. Next-generation sequencing identified a reported single missense mutation c.448 C>T (p. C150R) in the RBM family and a novel mutation c.814T>C (p. S272P) in the XMPMA patient. Therefore, FHL1-related myopathies overlap substantially and may not be simply classified into subtypes depending on reducing bodies. Biopsies of additional affected muscles can aid in finding reducing bodies. We report the first XMPMA patient with a novel FHL1 mutation and reducing bodies in a muscle biopsy in China.
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Affiliation(s)
- Ting Chen
- Department of Neurology, West China Hospital, Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041, China
| | - Xianghui Lu
- Department of Neurology, Chinese PLA General Hospital, 28 Fu Xing Road, Beijing 100853, China
| | - Qiang Shi
- Department of Neurology, Chinese PLA General Hospital, 28 Fu Xing Road, Beijing 100853, China
| | - Junhong Guo
- Department of Neurology, the First Hospital of Shanxi Medical University, 85 Jiefang South Road, Taiyuan 030001, China
| | - Huifang Wang
- Department of Neurology, the First Hospital of Shanxi Medical University, 85 Jiefang South Road, Taiyuan 030001, China
| | - Qian Wang
- Department of Emergency, Chinese Armed Police General Hospital, 69 Yong Ding Road, Beijing 100039, China
| | - Xi Yin
- Department of Neurology, Chinese PLA General Hospital, 28 Fu Xing Road, Beijing 100853, China
| | - Yutong Zhang
- Department of Neurology, Chinese PLA General Hospital, 28 Fu Xing Road, Beijing 100853, China
| | - Chuanqiang Pu
- Department of Neurology, Chinese PLA General Hospital, 28 Fu Xing Road, Beijing 100853, China.
| | - Dong Zhou
- Department of Neurology, West China Hospital, Sichuan University, 37 Guo Xue Xiang, Chengdu, Sichuan 610041, China.
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4
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Park YE, Kim DS, Shin JH. Myofibrillar myopathy caused by a novel FHL1 mutation presenting a mild myopathy with ankle contracture. Clin Neurol Neurosurg 2019; 180:48-51. [PMID: 30928807 DOI: 10.1016/j.clineuro.2019.03.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/27/2019] [Accepted: 03/18/2019] [Indexed: 11/29/2022]
Abstract
FHL1-related myopathies are clinically heterogeneous, involving skeletal and cardiac muscles. Overlapping clinical features include joint contractures, rigid spine, scapuloperoneal weakness and cardiac diseases. Histopathologically, reducing bodies are the most characteristic finding, but not present in all FHL1-related cases. Non-specific dystrophic pathology without reducing body is usual in the forms of X-linked myopathy with postural muscle atrophy, Emery-Dreifuss muscular dystrophy and isolated hypertrophic cardiomyopathy. Here, we describe a patient with mild weakness with ankle contracture. We finally concluded he has a FHL1-related myopathy at an extreme end of phenotypic spectrum of FHL1 myopathy, which one might miss to recognize as a form of myopathy. The genetic variant was detected by whole exome sequencing, and its pathogenicity was clearly confirmed with pathological and biochemical studies. This is the first FHL1 case with a mildest phenotype backed by biochemical/genetic evidence. This report will help clinicians hesitating to further evaluate mild cases to better correlate the genotype to the phenotype.
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Affiliation(s)
- Young-Eun Park
- Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea; Neurology, Pusan National University Hospital, Busan, South Korea
| | - Dae-Seong Kim
- Neurology, Pusan National University Yangsan Hospital, Yangsan, South Korea
| | - Jin-Hong Shin
- Neurology, Pusan National University Yangsan Hospital, Yangsan, South Korea.
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5
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Marchesi J, Ibelli A, Peixoto J, Cantão M, Pandolfi J, Marciano C, Zanella R, Settles M, Coutinho L, Ledur M. Whole transcriptome analysis of the pectoralis major muscle reveals molecular mechanisms involved with white striping in broiler chickens. Poult Sci 2019; 98:590-601. [DOI: 10.3382/ps/pey429] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/23/2018] [Indexed: 01/10/2023] Open
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6
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Keßler M, Kieltsch A, Kayvanpour E, Katus H, Schoser B, Schessl J, Just S, Rottbauer W. A zebrafish model for FHL1-opathy reveals loss-of-function effects of human FHL1 mutations. Neuromuscul Disord 2018; 28:521-531. [DOI: 10.1016/j.nmd.2018.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/27/2017] [Accepted: 03/01/2018] [Indexed: 11/16/2022]
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7
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Zafar S, Shafiq M, Younas N, Schmitz M, Ferrer I, Zerr I. Prion Protein Interactome: Identifying Novel Targets in Slowly and Rapidly Progressive Forms of Alzheimer's Disease. J Alzheimers Dis 2018; 59:265-275. [PMID: 28671123 DOI: 10.3233/jad-170237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Rapidly progressive Alzheimer's disease (rpAD) is a variant of AD distinguished by a rapid decline in cognition and short disease duration from onset to death. While attempts to identify rpAD based on biomarker profile classifications have been initiated, the mechanisms which contribute to the rapid decline and prion mimicking heterogeneity in clinical signs are still largely unknown. In this study, we characterized prion protein (PrP) expression, localization, and interactome in rpAD, slow progressive AD, and in non-dementia controls. PrP along with its interacting proteins were affinity purified with magnetic Dynabeads Protein-G, and were identified using Q-TOF-ESI/MS analysis. Our data demonstrated a significant 1.2-fold decrease in di-glycosylated PrP isoforms specifically in rpAD patients. Fifteen proteins appeared to interact with PrP and only two proteins3/4histone H2B-type1-B and zinc alpha-2 protein3/4were specifically bound with PrP isoform isolated from rpAD cases. Our data suggest distinct PrP involvement in association with the altered PrP interacting protein in rpAD, though the pathophysiological significance of these interactions remains to be established.
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Affiliation(s)
- Saima Zafar
- Department of Neurology, Clinical Dementia Center and DZNE, Georg-August University, University Medical Center Göttingen (UMG), Göttingen, Germany
| | - Mohsin Shafiq
- Department of Neurology, Clinical Dementia Center and DZNE, Georg-August University, University Medical Center Göttingen (UMG), Göttingen, Germany
| | - Neelam Younas
- Department of Neurology, Clinical Dementia Center and DZNE, Georg-August University, University Medical Center Göttingen (UMG), Göttingen, Germany
| | - Matthias Schmitz
- Department of Neurology, Clinical Dementia Center and DZNE, Georg-August University, University Medical Center Göttingen (UMG), Göttingen, Germany
| | - Isidre Ferrer
- Institute of Neuropathology, IDIBELL-University Hospital Bellvitge, University of Barcelona, Hospitalet de Llobregat, Spain.,CIBERNED (Network center for biomedical research of neurodegenerative diseases), Institute Carlos III, Ministry of Health, Spain
| | - Inga Zerr
- Department of Neurology, Clinical Dementia Center and DZNE, Georg-August University, University Medical Center Göttingen (UMG), Göttingen, Germany
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8
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Chardon JW, Jasmin BJ, Kothary R, Parks RJ. Report on the 3rd Ottawa International Conference on Neuromuscular Biology, Disease and Therapy - September 24-26, 2015, Ottawa, Canada. J Neuromuscul Dis 2016; 3:431-442. [PMID: 27854234 PMCID: PMC5123627 DOI: 10.3233/jnd-169001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jodi Warman Chardon
- Department of Medicine, The Ottawa Hospital and University of Ottawa.,Centre for Neuromuscular Disease, University of Ottawa.,Department of Pediatrics (Genetics), Children's Hospital of Eastern Ontario.,Neurosciences and Clinical Epidemiology Programs, Ottawa Hospital Research Institute
| | - Bernard J Jasmin
- Centre for Neuromuscular Disease, University of Ottawa.,Department of Cellular and Molecular Medicine, University of Ottawa
| | - Rashmi Kothary
- Regenerative Medicine Program, Ottawa Hospital Research Institute.,Department of Medicine, The Ottawa Hospital and University of Ottawa.,Centre for Neuromuscular Disease, University of Ottawa.,Department of Cellular and Molecular Medicine, University of Ottawa
| | - Robin J Parks
- Regenerative Medicine Program, Ottawa Hospital Research Institute.,Department of Medicine, The Ottawa Hospital and University of Ottawa.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa.,Centre for Neuromuscular Disease, University of Ottawa
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9
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Ruparelia AA, Oorschot V, Ramm G, Bryson-Richardson RJ. FLNC myofibrillar myopathy results from impaired autophagy and protein insufficiency. Hum Mol Genet 2016; 25:2131-2142. [PMID: 26969713 DOI: 10.1093/hmg/ddw080] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 03/07/2016] [Indexed: 01/23/2023] Open
Abstract
Myofibrillar myopathy is a progressive muscle disease characterized by the disintegration of muscle fibers and formation of protein aggregates. Causative mutations have been identified in nine genes encoding Z-disk proteins, including the actin binding protein filamin C (FLNC). To investigate the mechanism of disease in FLNCW2710X myopathy we overexpressed fluorescently tagged FLNC or FLNCW2710X in zebrafish. Expression of FLNCW2710X causes formation of protein aggregates but surprisingly, our studies reveal that the mutant protein localizes correctly to the Z-disk and is capable of rescuing the fiber disintegration phenotype that results from FLNC knockdown. This demonstrates that the functions necessary for muscle integrity are not impaired, and suggests that it is the formation of protein aggregates and subsequent sequestration of FLNC away from the Z-disk that results in myofibrillar disintegration. Similar to those found in patients, the aggregates in FLNCW2710X expressing fish contain the co-chaperone BAG3. FLNC is a target of the BAG3-mediated chaperone assisted selective autophagy (CASA) pathway and therefore we investigated its role, and the role of autophagy in general, in clearing protein aggregates. We reveal that despite BAG3 recruitment to the aggregates they are not degraded via CASA. Additionally, recruitment of BAG3 is sufficient to block alternative autophagy pathways which would otherwise clear the aggregates. This blockage can be relieved by reducing BAG3 levels or by stimulating autophagy. This study therefore identifies both BAG3 reduction and autophagy promotion as potential therapies for FLNCW2710X myofibrillar myopathy, and identifies protein insufficiency due to sequestration, compounded by impaired autophagy, as the cause.
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Affiliation(s)
| | - Viola Oorschot
- The Clive and Vera Ramaciotti Centre for Structural Cryo-Electron Microscopy and and
| | - Georg Ramm
- The Clive and Vera Ramaciotti Centre for Structural Cryo-Electron Microscopy and and Department of Biochemistry and Molecular Biology, Monash University, Melbourne, VIC 3800, Australia
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10
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Albrecht I, Wick C, Hallgren Å, Tjärnlund A, Nagaraju K, Andrade F, Thompson K, Coley W, Phadke A, Diaz-Gallo LM, Bottai M, Nennesmo I, Chemin K, Herrath J, Johansson K, Wikberg A, Ytterberg AJ, Zubarev RA, Danielsson O, Krystufkova O, Vencovsky J, Landegren N, Wahren-Herlenius M, Padyukov L, Kämpe O, Lundberg IE. Development of autoantibodies against muscle-specific FHL1 in severe inflammatory myopathies. J Clin Invest 2015; 125:4612-24. [PMID: 26551678 DOI: 10.1172/jci81031] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 09/25/2015] [Indexed: 11/17/2022] Open
Abstract
Mutations of the gene encoding four-and-a-half LIM domain 1 (FHL1) are the causative factor of several X-linked hereditary myopathies that are collectively termed FHL1-related myopathies. These disorders are characterized by severe muscle dysfunction and damage. Here, we have shown that patients with idiopathic inflammatory myopathies (IIMs) develop autoimmunity to FHL1, which is a muscle-specific protein. Anti-FHL1 autoantibodies were detected in 25% of IIM patients, while patients with other autoimmune diseases or muscular dystrophies were largely anti-FHL1 negative. Anti-FHL1 reactivity was predictive for muscle atrophy, dysphagia, pronounced muscle fiber damage, and vasculitis. FHL1 showed an altered expression pattern, with focal accumulation in the muscle fibers of autoantibody-positive patients compared with a homogeneous expression in anti-FHL1-negative patients and healthy controls. We determined that FHL1 is a target of the cytotoxic protease granzyme B, indicating that the generation of FHL1 fragments may initiate FHL1 autoimmunity. Moreover, immunization of myositis-prone mice with FHL1 aggravated muscle weakness and increased mortality, suggesting a direct link between anti-FHL1 responses and muscle damage. Together, our findings provide evidence that FHL1 may be involved in the pathogenesis not only of genetic FHL1-related myopathies but also of autoimmune IIM. Importantly, these results indicate that anti-FHL1 autoantibodies in peripheral blood have promising potential as a biomarker to identify a subset of severe IIM.
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11
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The sarcomeric M-region: a molecular command center for diverse cellular processes. BIOMED RESEARCH INTERNATIONAL 2015; 2015:714197. [PMID: 25961035 PMCID: PMC4413555 DOI: 10.1155/2015/714197] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 02/08/2015] [Indexed: 02/07/2023]
Abstract
The sarcomeric M-region anchors thick filaments and withstands the mechanical stress of contractions by deformation, thus enabling distribution of physiological forces along the length of thick filaments. While the role of the M-region in supporting myofibrillar structure and contractility is well established, its role in mediating additional cellular processes has only recently started to emerge. As such, M-region is the hub of key protein players contributing to cytoskeletal remodeling, signal transduction, mechanosensing, metabolism, and proteasomal degradation. Mutations in genes encoding M-region related proteins lead to development of severe and lethal cardiac and skeletal myopathies affecting mankind. Herein, we describe the main cellular processes taking place at the M-region, other than thick filament assembly, and discuss human myopathies associated with mutant or truncated M-region proteins.
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12
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Feeney SJ, McGrath MJ, Sriratana A, Gehrig SM, Lynch GS, D’Arcy CE, Price JT, McLean CA, Tupler R, Mitchell CA. FHL1 reduces dystrophy in transgenic mice overexpressing FSHD muscular dystrophy region gene 1 (FRG1). PLoS One 2015; 10:e0117665. [PMID: 25695429 PMCID: PMC4335040 DOI: 10.1371/journal.pone.0117665] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 12/29/2014] [Indexed: 01/01/2023] Open
Abstract
Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal-dominant disease with no effective treatment. The genetic cause of FSHD is complex and the primary pathogenic insult underlying the muscle disease is unknown. Several disease candidate genes have been proposed including DUX4 and FRG1. Expression analysis studies of FSHD report the deregulation of genes which mediate myoblast differentiation and fusion. Transgenic mice overexpressing FRG1 recapitulate the FSHD muscular dystrophy phenotype. Our current study selectively examines how increased expression of FRG1 may contribute to myoblast differentiation defects. We generated stable C2C12 cell lines overexpressing FRG1, which exhibited a myoblast fusion defect upon differentiation. To determine if myoblast fusion defects contribute to the FRG1 mouse dystrophic phenotype, this strain was crossed with skeletal muscle specific FHL1-transgenic mice. We previously reported that FHL1 promotes myoblast fusion in vitro and FHL1-transgenic mice develop skeletal muscle hypertrophy. In the current study, FRG1 mice overexpressing FHL1 showed an improvement in the dystrophic phenotype, including a reduced spinal kyphosis, increased muscle mass and myofiber size, and decreased muscle fibrosis. FHL1 expression in FRG1 mice, did not alter satellite cell number or activation, but enhanced myoblast fusion. Primary myoblasts isolated from FRG1 mice showed a myoblast fusion defect that was rescued by FHL1 expression. Therefore, increased FRG1 expression may contribute to a muscular dystrophy phenotype resembling FSHD by impairing myoblast fusion, a defect that can be rescued by enhanced myoblast fusion via expression of FHL1.
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Affiliation(s)
- Sandra J. Feeney
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - Meagan J. McGrath
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - Absorn Sriratana
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - Stefan M. Gehrig
- Basic and Clinical Myology Laboratory, Department of Physiology, The University of Melbourne, Victoria, 3010, Australia
| | - Gordon S. Lynch
- Basic and Clinical Myology Laboratory, Department of Physiology, The University of Melbourne, Victoria, 3010, Australia
| | - Colleen E. D’Arcy
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - John T. Price
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
- Centre for Chronic Disease Prevention and Management, College of Health and Biomedicine, Victoria University, Melbourne, Victoria, 8001, Australia
| | - Catriona A. McLean
- Department of Anatomical Pathology, Alfred Hospital, Prahran, Victoria, 3004, Australia
- Department of Medicine, Central Clinical School, Monash University, Clayton, VIC, 3800, Australia
| | - Rossella Tupler
- Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, MA, 01655, United States of America
- Dipartimento di Scienze della Vita, Universita di Modena e Reggio Emilia, 41125, Modena, Italy
| | - Christina A. Mitchell
- Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria, 3800, Australia
- * E-mail:
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13
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Emmanuele V, Kubota A, Garcia-Diaz B, Garone C, Akman HO, Sánchez-Gutiérrez D, Escudero LM, Kariya S, Homma S, Tanji K, Quinzii CM, Hirano M. Fhl1 W122S causes loss of protein function and late-onset mild myopathy. Hum Mol Genet 2014; 24:714-26. [PMID: 25274776 DOI: 10.1093/hmg/ddu490] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
A member of the four-and-a-half-LIM (FHL) domain protein family, FHL1, is highly expressed in human adult skeletal and cardiac muscle. Mutations in FHL1 have been associated with diverse X-linked muscle diseases: scapuloperoneal (SP) myopathy, reducing body myopathy, X-linked myopathy with postural muscle atrophy, rigid spine syndrome (RSS) and Emery-Dreifuss muscular dystrophy. In 2008, we identified a missense mutation in the second LIM domain of FHL1 (c.365 G>C, p.W122S) in a family with SP myopathy. We generated a knock-in mouse model harboring the c.365 G>C Fhl1 mutation and investigated the effects of this mutation at three time points (3-5 months, 7-10 months and 18-20 months) in hemizygous male and heterozygous female mice. Survival was comparable in mutant and wild-type animals. We observed decreased forelimb strength and exercise capacity in adult hemizygous male mice starting from 7 to 10 months of age. Western blot analysis showed absence of Fhl1 in muscle at later stages. Thus, adult hemizygous male, but not heterozygous female, mice showed a slowly progressive phenotype similar to human patients with late-onset muscle weakness. In contrast to SP myopathy patients with the FHL1 W122S mutation, mutant mice did not manifest cytoplasmic inclusions (reducing bodies) in muscle. Because muscle weakness was evident prior to loss of Fhl1 protein and without reducing bodies, our findings indicate that loss of function is responsible for the myopathy in the Fhl1 W122S knock-in mice.
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Affiliation(s)
- Valentina Emmanuele
- Department of Neurology Pediatric Clinic, Istituto di Ricovero e Cura a Carattere Scientifico G. Gaslini, University of Genoa, Genoa 16100, Italy and
| | | | | | | | | | - Daniel Sánchez-Gutiérrez
- Departamento de Biología Celular, Universidad de Sevilla and Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universdad de Sevilla, 41013 Seville, Spain
| | - Luis M Escudero
- Departamento de Biología Celular, Universidad de Sevilla and Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universdad de Sevilla, 41013 Seville, Spain
| | | | - Shunichi Homma
- Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Kurenai Tanji
- Department of Neurology Department of Pathology and Cell Biology
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14
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Sabatelli P, Castagnaro S, Tagliavini F, Chrisam M, Sardone F, Demay L, Richard P, Santi S, Maraldi NM, Merlini L, Sandri M, Bonaldo P. Aggresome-Autophagy Involvement in a Sarcopenic Patient with Rigid Spine Syndrome and a p.C150R Mutation in FHL1 Gene. Front Aging Neurosci 2014; 6:215. [PMID: 25191266 PMCID: PMC4137286 DOI: 10.3389/fnagi.2014.00215] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 08/04/2014] [Indexed: 11/13/2022] Open
Abstract
The four-and-half LIM domain protein 1 (FHL1) is highly expressed in skeletal and cardiac muscle. Mutations of the FHL1 gene have been associated with diverse chronic myopathies including reducing body myopathy, rigid spine syndrome (RSS), and Emery–Dreifuss muscular dystrophy. We investigated a family with a mutation (p.C150R) in the second LIM domain of FHL1. In this family, a brother and a sister were affected by RSS, and their mother had mild lower limbs weakness. The 34-year-old female had an early and progressive rigidity of the cervical spine and severe respiratory insufficiency. Muscle mass evaluated by DXA was markedly reduced, while fat mass was increased to 40%. CT scan showed an almost complete substitution of muscle by fibro-adipose tissue. Muscle biopsy showed accumulation of FHL1 throughout the cytoplasm and around myonuclei into multiprotein aggregates with aggresome/autophagy features as indicated by ubiquitin, p62, and LC3 labeling. DNA deposits, not associated with nuclear lamina components and histones, were also detected in the aggregates, suggesting nuclear degradation. Ultrastructural analysis showed the presence of dysmorphic nuclei, accumulation of tubulofilamentous and granular material, and perinuclear accumulation of autophagic vacuoles. These data point to involvement of the aggresome–autophagy pathway in the pathophysiological mechanism underlying the muscle pathology of FHL1 C150R mutation.
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Affiliation(s)
- Patrizia Sabatelli
- Institute of Molecular Genetics, CNR-National Research Council of Italy , Bologna , Italy ; SC Laboratory of Musculoskeletal Cell Biology, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Silvia Castagnaro
- Department of Molecular Medicine, University of Padova , Padova , Italy
| | - Francesca Tagliavini
- Institute of Molecular Genetics, CNR-National Research Council of Italy , Bologna , Italy ; SC Laboratory of Musculoskeletal Cell Biology, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Martina Chrisam
- Department of Molecular Medicine, University of Padova , Padova , Italy
| | - Francesca Sardone
- Institute of Molecular Genetics, CNR-National Research Council of Italy , Bologna , Italy ; SC Laboratory of Musculoskeletal Cell Biology, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Laurence Demay
- UF Cardiogénétique et Myogénétique, Service de Biochimie Métabolique, Groupe Hospitalier Pitié-Salpêtrière , Paris , France
| | - Pascale Richard
- UF Cardiogénétique et Myogénétique, Centre de Génétique, Hôpitaux Universitaires de la Pitié Salpêtrière , Paris , France
| | - Spartaco Santi
- Institute of Molecular Genetics, CNR-National Research Council of Italy , Bologna , Italy ; SC Laboratory of Musculoskeletal Cell Biology, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Nadir M Maraldi
- Institute of Molecular Genetics, CNR-National Research Council of Italy , Bologna , Italy
| | - Luciano Merlini
- SC Laboratory of Musculoskeletal Cell Biology, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Marco Sandri
- Dulbecco Telethon Institute, Venetian Institute of Molecular Medicine , Padova , Italy ; Department of Biomedical Science, University of Padova , Padova , Italy
| | - Paolo Bonaldo
- Department of Molecular Medicine, University of Padova , Padova , Italy
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