51
|
Collier MP, Alderson TR, de Villiers CP, Nicholls D, Gastall HY, Allison TM, Degiacomi MT, Jiang H, Mlynek G, Fürst DO, van der Ven PFM, Djinovic-Carugo K, Baldwin AJ, Watkins H, Gehmlich K, Benesch JLP. HspB1 phosphorylation regulates its intramolecular dynamics and mechanosensitive molecular chaperone interaction with filamin C. SCIENCE ADVANCES 2019; 5:eaav8421. [PMID: 31131323 PMCID: PMC6530996 DOI: 10.1126/sciadv.aav8421] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 04/16/2019] [Indexed: 05/13/2023]
Abstract
Mechanical force-induced conformational changes in proteins underpin a variety of physiological functions, typified in muscle contractile machinery. Mutations in the actin-binding protein filamin C (FLNC) are linked to musculoskeletal pathologies characterized by altered biomechanical properties and sometimes aggregates. HspB1, an abundant molecular chaperone, is prevalent in striated muscle where it is phosphorylated in response to cues including mechanical stress. We report the interaction and up-regulation of both proteins in three mouse models of biomechanical stress, with HspB1 being phosphorylated and FLNC being localized to load-bearing sites. We show how phosphorylation leads to increased exposure of the residues surrounding the HspB1 phosphosite, facilitating their binding to a compact multidomain region of FLNC proposed to have mechanosensing functions. Steered unfolding of FLNC reveals that its extension trajectory is modulated by the phosphorylated region of HspB1. This may represent a posttranslationally regulated chaperone-client protection mechanism targeting over-extension during mechanical stress.
Collapse
Affiliation(s)
- Miranda P. Collier
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - T. Reid Alderson
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Carin P. de Villiers
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine and British Heart Foundation Centre of Research Excellence Oxford, University of Oxford, Headington, Oxford OX3 9DU, UK
| | - Daisy Nicholls
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Heidi Y. Gastall
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Timothy M. Allison
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
- Biomolecular Interaction Centre and School of Physical and Chemical Sciences, University of Canterbury, Christchurch 8140, New Zealand
| | - Matteo T. Degiacomi
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK
| | - He Jiang
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine and British Heart Foundation Centre of Research Excellence Oxford, University of Oxford, Headington, Oxford OX3 9DU, UK
| | - Georg Mlynek
- Department of Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Dieter O. Fürst
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| | - Peter F. M. van der Ven
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| | - Kristina Djinovic-Carugo
- Department of Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
- Department of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia
| | - Andrew J. Baldwin
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
| | - Hugh Watkins
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine and British Heart Foundation Centre of Research Excellence Oxford, University of Oxford, Headington, Oxford OX3 9DU, UK
| | - Katja Gehmlich
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine and British Heart Foundation Centre of Research Excellence Oxford, University of Oxford, Headington, Oxford OX3 9DU, UK
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham B15 2TT, UK
- Corresponding author. (J.L.P.B.); (K.G.)
| | - Justin L. P. Benesch
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
- Corresponding author. (J.L.P.B.); (K.G.)
| |
Collapse
|
52
|
Previtali SC, Scarlato M, Vezzulli P, Ruggieri A, Velardo D, Benedetti S, Torini G, Colombo B, Maggi L, Di Bella D, Gellera C, D'Angelo G, Mora M. Expanding the central nervous system disease spectrum associated with FLNC mutation. Muscle Nerve 2019; 59:E33-E37. [PMID: 30734317 DOI: 10.1002/mus.26443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 02/04/2019] [Accepted: 02/05/2019] [Indexed: 11/05/2022]
Affiliation(s)
- Stefano C Previtali
- InSpe (Institute of Experimental Neurology), Division of Neuroscience and Dept. of Neurology, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Marina Scarlato
- InSpe (Institute of Experimental Neurology), Division of Neuroscience and Dept. of Neurology, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Paolo Vezzulli
- Neuroradiology Department, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Alessandra Ruggieri
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Daniele Velardo
- InSpe (Institute of Experimental Neurology), Division of Neuroscience and Dept. of Neurology, IRCCS Ospedale San Raffaele, Milano, Italy.,Neuromuscular Disorders Unit, Scientific Institute IRCCS E. Medea, Bosisio Parini, Lecco, Italy
| | - Sara Benedetti
- Laboratory of Clinical Molecular Biology and Cytogenetics, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Giacomo Torini
- Genomic Unit for the Diagnosis of Human Pathologies, Division of Genetics and Cellular Biology, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Bruno Colombo
- InSpe (Institute of Experimental Neurology), Division of Neuroscience and Dept. of Neurology, IRCCS Ospedale San Raffaele, Milano, Italy
| | - Lorenzo Maggi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Daniela Di Bella
- Unit of Genetics of Neurodegenerative and Metabolic Diseases, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Cinzia Gellera
- Unit of Genetics of Neurodegenerative and Metabolic Diseases, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Grazia D'Angelo
- Neuromuscular Disorders Unit, Scientific Institute IRCCS E. Medea, Bosisio Parini, Lecco, Italy
| | - Marina Mora
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| |
Collapse
|
53
|
Gemelli C, Prada V, Fiorillo C, Fabbri S, Maggi L, Geroldi A, Gibertini S, Mandich P, Trevisan L, Fossa P, Tagliafico AS, Schenone A, Grandis M. A novel mutation in the N-terminal acting-binding domain of Filamin C protein causing a distal myofibrillar myopathy. J Neurol Sci 2019; 398:75-78. [PMID: 30685713 DOI: 10.1016/j.jns.2019.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 01/10/2019] [Accepted: 01/14/2019] [Indexed: 02/02/2023]
Abstract
Variants in Filamin C (FLNC) gene may cause either cardiomyopathies or different myopathies. We describe a family affected by a distal myopathy with autosomal dominant inheritance. The onset of the disease was in the third decade with gait impairment due to distal leg weakness. Subsequently, the disease progressed with an involvement of proximal lower limbs and hand muscles. Muscle biopsy, performed in one subject,identified relevant myofibrillar abnormalities. We performed a target gene panel testing for myofibrillar myopathies by NGS approach which identified a novel mutation in exon 3 of FLNC gene (c.A664G:p.M222V), within the N-terminal actin-binding (ABD) domain. This variant has been identified in all affected members of the family, thus supporting its pathogenic role. Differently from previously identified variants, our family showed a predominant leg involvement and myofibrillar aggregates, thus further expanding the spectrum of Filamin C related myopathies.
Collapse
Affiliation(s)
- Chiara Gemelli
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy.
| | - Valeria Prada
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy
| | - Chiara Fiorillo
- Department of Neuroscience, Paediatric Neurology and Neuromuscular Disorders, Istituto Giannina Gaslini, University of Genova, Via Gerolamo Gaslini, 5, 16147 Genova, Italy
| | - Sabrina Fabbri
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy
| | - Lorenzo Maggi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico "Carlo Besta", Via Celoria 11, 20133 Milano, Italy
| | - Alessandro Geroldi
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy
| | - Sara Gibertini
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico "Carlo Besta", Via Celoria 11, 20133 Milano, Italy
| | - Paola Mandich
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy; Ospedale Policlinico San Martino IRCCS-Medical Genetic Unit, Largo R. Benzi 10, 16132 Genoa, Italy
| | - Lucia Trevisan
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy; Ospedale Policlinico San Martino IRCCS-Medical Genetic Unit, Largo R. Benzi 10, 16132 Genoa, Italy
| | - Paola Fossa
- Department of Pharmacy, Section of Medicinal Chemistry, School of Medical and Pharmaceutical Sciences, University of Genova, Viale Benedetto XV 3, 16132 Genova, Italy
| | - Alberto Stefano Tagliafico
- Department of Health Sciences (DISSAL), Radiology Section, University of Genova, Via Pastore, 1-16132 Genova, Italy; Emergency Radiology, Policlinico San Martino, Largo Rosanna Benzi, 10-16132 Genova, Italy
| | - Angelo Schenone
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy; Ospedale Policlinico San Martino IRCCS-Neurological Unit, Largo R. Benzi 10, 16132 Genoa, Italy
| | - Marina Grandis
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetic and Maternal and Infantile Sciences (DINOGMI), University of Genova, Largo Daneo 3, 16132 Genova, Italy; Ospedale Policlinico San Martino IRCCS-Neurological Unit, Largo R. Benzi 10, 16132 Genoa, Italy.
| |
Collapse
|
54
|
Borch JDS, Eisum ASV, Krag T, Vissing J. Expanding the phenotype of filamin-C-related myofibrillar myopathy. Clin Neurol Neurosurg 2019; 176:30-33. [DOI: 10.1016/j.clineuro.2018.11.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/01/2018] [Accepted: 11/17/2018] [Indexed: 02/08/2023]
|
55
|
Ader F, Villard E, Ledeuil C, Charron P, Richard P. [Genotype-phenotype correlations of pathogenic variants in the FLNC gene]. Med Sci (Paris) 2018; 34 Hors série n°2:39-41. [PMID: 30418145 DOI: 10.1051/medsci/201834s211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Flavie Ader
- Unité Fonctionnelle de Cardiogénétique et Myogénétique, Centre de Génétique, Hôpitaux Universitaires Pitié Salpêtrière - Charles Foix, Paris, France
| | - Eric Villard
- Sorbonne Université, UPMC Univ. Paris 06, Inserm, UMR_S 1166 and ICAN Institute for Cardiometabolism and Nutrition, Paris, France
| | - Céline Ledeuil
- Unité Fonctionnelle de Cardiogénétique et Myogénétique, Centre de Génétique, Hôpitaux Universitaires Pitié Salpêtrière - Charles Foix, Paris France
| | - Philippe Charron
- APHP, Centre de référence pour les maladies cardiaques héréditaires, Hôpital Pitié-Salpêtrière, Paris, France
| | - Pascale Richard
- Unité Fonctionnelle de Cardiogénétique et Myogénétique, Centre de Génétique, Hôpitaux Universitaires Pitié Salpêtrière - Charles Foix, Paris, France
| |
Collapse
|
56
|
Cui H, Wang J, Zhang C, Wu G, Zhu C, Tang B, Zou Y, Huang X, Hui R, Song L, Wang S. Mutation profile of FLNC gene and its prognostic relevance in patients with hypertrophic cardiomyopathy. Mol Genet Genomic Med 2018; 6:1104-1113. [PMID: 30411535 PMCID: PMC6305649 DOI: 10.1002/mgg3.488] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 08/30/2018] [Accepted: 09/14/2018] [Indexed: 01/18/2023] Open
Abstract
Background Filamin C (FLNC) mutation was reported as a cause of HCM, with a high probability of sudden cardiac death. However, the mutation profile of FLNC, and its relationship with phenotypic expression in HCM, remains to be elucidated. Methods In this study, FLNC gene was sequenced in 540 HCM patients and 307 healthy controls. Results We found that 39 (7.2%) patients carried FLNC mutations, with a similar frequency to that of controls (4.2%, p = 0.101). Pedigree analysis showed that mutations were not well segregated with HCM. The baseline characteristics between HCM patients, with and without mutations, were comparable. FLNC mutations did not increase the risk for either all‐cause mortality (HR 0.746, 95% CI 0.222–2.295, p = 0.575) or cardiac mortality (HR 0.615, 95% CI 0.153–1.947, p = 0.354) in HCM patients during a follow‐up of 4.7 ± 3.2 years. Moreover, there was no significant difference in survival free from sudden cardiac arrest (HR 0.721, 95% CI 0.128–3.667, p = 0.660) and heart failure (HR 0.757, 95% CI 0.318–1.642, p = 0.447). Conclusions FLNC mutations were common in both HCM patients and healthy population. The pathogenicity of FLNC mutations detected in HCM patients and its association with the clinical outcomes should be cautiously interpreted.
Collapse
Affiliation(s)
- Hao Cui
- Department of Cardiac Surgery, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jizheng Wang
- State Key Laboratory of Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ce Zhang
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Guixin Wu
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Changsheng Zhu
- Department of Cardiac Surgery, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Bing Tang
- Department of Cardiac Surgery, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yubao Zou
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiaohong Huang
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Rutai Hui
- State Key Laboratory of Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Lei Song
- Department of Cardiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shuiyun Wang
- Department of Cardiac Surgery, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| |
Collapse
|
57
|
Abstract
Intermediate filaments (IFs) are one of the three major elements of the cytoskeleton. Their stability, intrinsic mechanical properties, and cell type-specific expression patterns distinguish them from actin and microtubules. By providing mechanical support, IFs protect cells from external forces and participate in cell adhesion and tissue integrity. IFs form an extensive and elaborate network that connects the cell cortex to intracellular organelles. They act as a molecular scaffold that controls intracellular organization. However, IFs have been revealed as much more than just rigid structures. Their dynamics is regulated by multiple signaling cascades and appears to contribute to signaling events in response to cell stress and to dynamic cellular functions such as mitosis, apoptosis, and migration.
Collapse
Affiliation(s)
- Sandrine Etienne-Manneville
- Institut Pasteur Paris, CNRS UMR 3691, Cell Polarity, Migration and Cancer Unit, Equipe Labellisée Ligue Contre le Cancer, Paris Cedex 15, France;
| |
Collapse
|
58
|
Miao J, Su FF, Liu XM, Wei XJ, Yuan Y, Yu XF. A case report: a heterozygous deletion (2791_2805 del) in exon 18 of the filamin C gene causing filamin C-related myofibrillar myopathies in a Chinese family. BMC Neurol 2018; 18:79. [PMID: 29866061 PMCID: PMC5985593 DOI: 10.1186/s12883-018-1078-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 05/22/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Filamin C-related myofibrillar myopathies (MFM) are progressive skeletal myopathies with an autosomal dominant inheritance pattern. The conditions are caused by mutations of the filamin C gene (FLNC) located in the chromosome 7q32-q35 region. Genetic variations in the FLNC gene result in various clinical phenotypes. CASE PRESENTATION We describe a 43-year-old woman who suffered filamin C-related MFM, with symptoms first presenting in the proximal muscles of the lower limbs and eventually spreading to the upper limbs and distal muscles. The patient's serum level of creatine kinase was mildly increased. Mildy myopathic changes in the electromyographic exam and moderate lipomatous alterations in lower limb MRI were found. Histopathological examination revealed increased muscle fiber size variability, disturbances in oxidative enzyme activity, and the presence of abnormal protein aggregates and vacuoles in some muscle fibers. Ultrastructural analysis showed inclusions composed of thin filaments and interspersed granular densities. DNA sequencing analysis detected a novel 15-nucleotide deletion (c.2791_2805del, p.931_935del) in the FLNC gene. The patient's father, sister, brother, three paternal aunts, one paternal uncle, and the uncle's son also had slowly progressive muscle weakness, and thus, we detected an autosomal dominant inheritance pattern of the disorder. CONCLUSIONS A novel heterogeneous 15-nucleotide deletion (c.2791_2805del, p.931_935del) in the Ig-like domain 7 of the FLNC gene was found to cause filamin C-related MFM. This deletion in the FLNC gene causes protein aggregation, abnormalities in muscle structure, and impairment in muscle fiber function, which leads to muscle weakness.
Collapse
Affiliation(s)
- Jing Miao
- Department of Neurology and Neuroscience Center, First Affiliated Hospital of Jilin University, Changchun, 130021 Jilin, People’s Republic of China
| | - Fei-fei Su
- Department of Neurology and Neuroscience Center, First Affiliated Hospital of Jilin University, Changchun, 130021 Jilin, People’s Republic of China
| | - Xue-mei Liu
- Department of Neurology and Neuroscience Center, First Affiliated Hospital of Jilin University, Changchun, 130021 Jilin, People’s Republic of China
| | - Xiao-jing Wei
- Department of Neurology and Neuroscience Center, First Affiliated Hospital of Jilin University, Changchun, 130021 Jilin, People’s Republic of China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, #8 Xishiku St, Xicheng District, Beijing, 100034 China
| | - Xue-fan Yu
- Department of Neurology and Neuroscience Center First Affiliated Hospital of Jilin University, Changchun, 130021 Jilin, People’s Republic of China
| |
Collapse
|
59
|
Nozari A, Aghaei-Moghadam E, Zeinaloo A, Mollazadeh R, Majnoon MT, Alavi A, Ghasemi Firouzabadi S, Mohammadzadeh A, Banihashemi S, Nikzaban M, Najmabadi H, Behjati F. A novel splicing variant in FLNC gene responsible for a highly penetrant familial dilated cardiomyopathy in an extended Iranian family. Gene 2018; 659:160-167. [DOI: 10.1016/j.gene.2018.03.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Revised: 02/28/2018] [Accepted: 03/15/2018] [Indexed: 10/17/2022]
|
60
|
|
61
|
Baudier J, Jenkins ZA, Robertson SP. The filamin-B–refilin axis – spatiotemporal regulators of the actin-cytoskeleton in development and disease. J Cell Sci 2018; 131:131/8/jcs213959. [DOI: 10.1242/jcs.213959] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
ABSTRACT
During development, cycles of spatiotemporal remodeling of higher-order networks of actin filaments contribute to control cell fate specification and differentiation. Programs for controlling these dynamics are hard-wired into actin-regulatory proteins. The filamin family of actin-binding proteins exert crucial mechanotransduction and signaling functions in tissue morphogenesis. Filamin-B (FLNB) is a key player in chondrocyte progenitor differentiation for endochondral ossification. Biallelic loss-of-function mutations or gain-of-function mutations in FLNB cause two groups of skeletal disorders that can be attributed to either the loss of repressive function on TGF-β signaling or a disruption in mechanosensory properties, respectively. In this Review, we highlight a unique family of vertebrate-specific short-lived filamin-binding proteins, the refilins (refilin-A and refilin-B), that modulate filamin-dependent actin crosslinking properties. Refilins are downstream TGF-β effectors in epithelial cells. Double knockout of both refilin-A and refilin-B in mice results in precocious ossification of some axial skeletal elements, leading to malformations that are similar to those seen in FLNB-deficient mice. Based on these findings, we present a model summarizing the role of refilins in regulating the mechanosensory functions of FLNB during skeletal development. We also discuss the possible contribution of refilins to FLNB-related skeletal pathologies that are associated with gain-of-function mutations.
Collapse
Affiliation(s)
- Jacques Baudier
- Aix Marseille Université, CNRS, IBDM, 13284 Marseille Cedex 07, France
- Institut de Biologie du Développement de Marseille-UMR CNRS 7288, Campus de Luminy-Case 907, 13288 Marseille Cedex 9, France
| | - Zandra A. Jenkins
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| | - Stephen P. Robertson
- Department of Women's and Children's Health, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
| |
Collapse
|
62
|
Begay RL, Graw SL, Sinagra G, Asimaki A, Rowland TJ, Slavov DB, Gowan K, Jones KL, Brun F, Merlo M, Miani D, Sweet M, Devaraj K, Wartchow EP, Gigli M, Puggia I, Salcedo EE, Garrity DM, Ambardekar AV, Buttrick P, Reece TB, Bristow MR, Saffitz JE, Mestroni L, Taylor MRG. Filamin C Truncation Mutations Are Associated With Arrhythmogenic Dilated Cardiomyopathy and Changes in the Cell-Cell Adhesion Structures. JACC Clin Electrophysiol 2018; 4:504-514. [PMID: 30067491 PMCID: PMC6074050 DOI: 10.1016/j.jacep.2017.12.003] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/20/2017] [Accepted: 12/07/2017] [Indexed: 12/15/2022]
Abstract
OBJECTIVES The purpose of this study was to assess the phenotype of Filamin C (FLNC) truncating variants in dilated cardiomyopathy (DCM) and understand the mechanism leading to an arrhythmogenic phenotype. BACKGROUND Mutations in FLNC are known to lead to skeletal myopathies, which may have an associated cardiac component. Recently, the clinical spectrum of FLNC mutations has been recognized to include a cardiac-restricted presentation in the absence of skeletal muscle involvement. METHODS A population of 319 U.S. and European DCM cardiomyopathy families was evaluated using whole-exome and targeted next-generation sequencing. FLNC truncation probands were identified and evaluated by clinical examination, histology, transmission electron microscopy, and immunohistochemistry. RESULTS A total of 13 individuals in 7 families (2.2%) were found to harbor 6 different FLNC truncation variants (2 stopgain, 1 frameshift, and 3 splicing). Of the 13 FLNC truncation carriers, 11 (85%) had either ventricular arrhythmias or sudden cardiac death, and 5 (38%) presented with evidence of right ventricular dilation. Pathology analysis of 2 explanted hearts from affected FLNC truncation carriers showed interstitial fibrosis in the right ventricle and epicardial fibrofatty infiltration in the left ventricle. Ultrastructural findings included occasional disarray of Z-discs within the sarcomere. Immunohistochemistry showed normal plakoglobin signal at cell-cell junctions, but decreased signals for desmoplakin and synapse-associated protein 97 in the myocardium and buccal mucosa. CONCLUSIONS We found FLNC truncating variants, present in 2.2% of DCM families, to be associated with a cardiac-restricted arrhythmogenic DCM phenotype characterized by a high risk of life-threatening ventricular arrhythmias and a pathological cellular phenotype partially overlapping with arrhythmogenic right ventricular cardiomyopathy.
Collapse
Affiliation(s)
- Rene L Begay
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Sharon L Graw
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Gianfranco Sinagra
- Department of Cardiology, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Angeliki Asimaki
- Department of Pathology, Beth Israel Deaconess Medical Center & Harvard Medical School, Boston, Massachusetts
| | - Teisha J Rowland
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Dobromir B Slavov
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Katherine Gowan
- Department of Pediatrics, Section of Hematology, Oncology, and Bone Marrow Transplant, University of Colorado Denver, Aurora, Colorado
| | - Kenneth L Jones
- Department of Pediatrics, Section of Hematology, Oncology, and Bone Marrow Transplant, University of Colorado Denver, Aurora, Colorado
| | - Francesca Brun
- Department of Cardiology, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Marco Merlo
- Department of Cardiology, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Daniela Miani
- Department of Cardiothoracic Science, University Hospital S. Maria della Misericordia, Udine, Italy
| | - Mary Sweet
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Kalpana Devaraj
- Department of Pathology, University of Colorado, University Hospital, Aurora, Colorado
| | - Eric P Wartchow
- Department of Pathology, Children's Hospital Colorado, Aurora, Colorado
| | - Marta Gigli
- Department of Cardiology, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Ilaria Puggia
- Department of Cardiology, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Ernesto E Salcedo
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Deborah M Garrity
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, Colorado
| | - Amrut V Ambardekar
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Peter Buttrick
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - T Brett Reece
- Department of Surgery, University of Colorado Denver, Aurora, Colorado
| | - Michael R Bristow
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Jeffrey E Saffitz
- Department of Pathology, Beth Israel Deaconess Medical Center & Harvard Medical School, Boston, Massachusetts
| | - Luisa Mestroni
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado
| | - Matthew R G Taylor
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, Colorado.
| |
Collapse
|
63
|
Mercer EJ, Lin YF, Cohen-Gould L, Evans T. Hspb7 is a cardioprotective chaperone facilitating sarcomeric proteostasis. Dev Biol 2018; 435:41-55. [PMID: 29331499 DOI: 10.1016/j.ydbio.2018.01.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 12/29/2017] [Accepted: 01/09/2018] [Indexed: 02/02/2023]
Abstract
Small heat shock proteins are chaperones with variable mechanisms of action. The function of cardiac family member Hspb7 is unknown, despite being identified through GWAS as a potential cardiomyopathy risk gene. We discovered that zebrafish hspb7 mutants display mild focal cardiac fibrosis and sarcomeric abnormalities. Significant mortality was observed in adult hspb7 mutants subjected to exercise stress, demonstrating a genetic and environmental interaction that determines disease outcome. We identified large sarcomeric proteins FilaminC and Titin as Hspb7 binding partners in cardiac cells. Damaged FilaminC undergoes autophagic processing to maintain sarcomeric homeostasis. Loss of Hspb7 in zebrafish or human cardiomyocytes stimulated autophagic pathways and expression of the sister gene encoding Hspb5. Inhibiting autophagy caused FilaminC aggregation in HSPB7 mutant human cardiomyocytes and developmental cardiomyopathy in hspb7 mutant zebrafish embryos. These studies highlight the importance of damage-processing networks in cardiomyocytes, and a previously unrecognized role in this context for Hspb7.
Collapse
Affiliation(s)
- Emily J Mercer
- Department of Surgery, Weill Cornell Medical College, United States
| | - Yi-Fan Lin
- Department of Surgery, Weill Cornell Medical College, United States
| | - Leona Cohen-Gould
- Department of Biochemistry, Weill Cornell Medical College, United States
| | - Todd Evans
- Department of Surgery, Weill Cornell Medical College, United States.
| |
Collapse
|
64
|
Goldmann WH. Intermediate filaments and cellular mechanics. Cell Biol Int 2018; 42:132-138. [PMID: 28980752 DOI: 10.1002/cbin.10879] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 09/30/2017] [Indexed: 12/16/2022]
Abstract
Intermediate filaments (IFs) are one of the three types of cytoskeletal polymers that resist tensile and compressive forces in cells. They crosslink each other as well as with actin filaments and microtubules by proteins, which include desmin, filamin C, plectin, and lamin (A/C). Mutations in these proteins can lead to a wide range of pathologies, some of which exhibit mechanical failure of the skin, skeletal, or heart muscle.
Collapse
Affiliation(s)
- Wolfgang H Goldmann
- Department of Physics, Biophysics Group, Friedrich-Alexander-University Erlangen-Nuremberg, D-91052 Erlangen, Germany
| |
Collapse
|
65
|
Bond AR, Iacobazzi D, Abdul-Ghani S, Ghorbel M, Heesom K, Wilson M, Gillett C, George SJ, Caputo M, Suleiman S, Tulloh RMR. Changes in contractile protein expression are linked to ventricular stiffness in infants with pulmonary hypertension or right ventricular hypertrophy due to congenital heart disease. Open Heart 2018; 5:e000716. [PMID: 29344379 PMCID: PMC5761287 DOI: 10.1136/openhrt-2017-000716] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 11/15/2017] [Accepted: 11/18/2017] [Indexed: 12/12/2022] Open
Abstract
Background The right ventricle (RV) is not designed to sustain high pressure leading to failure. There are no current medications to help RV contraction, so further information is required on adaption of the RV to such hypertension. Methods The Right Ventricle in Children (RVENCH) study assessed infants with congenital heart disease undergoing cardiac surgery with hypertensive RV. Clinical and echocardiographic data were recorded, and samples of RV were taken from matched infants, analysed for proteomics and compared between pathologies and with clinical and echocardiographic outcome data. Results Those with tetralogy of Fallot (TOF) were significantly more cyanosed than those with ventricular septal defect (median oxygen saturation 83% vs 98%, P=0.0038), had significantly stiffer RV (tricuspid E wave/A wave ratio 1.95 vs 0.84, P=0.009) and had most had restrictive physiology. Gene ontology in TOF, with enrichment analysis, demonstrated significant increase in proteins of contractile mechanisms and those of calmodulin, actin binding and others associated with contractility than inventricular septal defect. Structural proteins were also found to be higher in association with sarcomeric function: Z-disc, M-Band and thin-filament proteins. Remaining proteins associated with actin binding, calcium signalling and myocyte cytoskeletal development. Phosphopeptide enrichment led to higher levels of calcium signalling proteins in TOF. Conclusion This is the first demonstration that those with an RV, which is stiff and hypertensive in TOF, have a range of altered proteins, often in calcium signalling pathways. Information about these alterations might guide treatment options both in terms of individualised therapy or inotropic support for the Right ventricle when hypertensive due to pulmoanry hypertension or congenital heart disease.
Collapse
Affiliation(s)
- Andrew R Bond
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Dominga Iacobazzi
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Safa Abdul-Ghani
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Mohammed Ghorbel
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Kate Heesom
- Proteomics Facility, University of Bristol, Bristol, UK
| | | | | | - Sarah J George
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Massimo Caputo
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK.,Department of Congenital Heart Disease, King David Building, Bristol, UK
| | - Saadeh Suleiman
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK
| | - Robert M R Tulloh
- Clinical Sciences, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, UK.,Department of Congenital Heart Disease, King David Building, Bristol, UK
| |
Collapse
|
66
|
Rossi D, Palmio J, Evilä A, Galli L, Barone V, Caldwell TA, Policke RA, Aldkheil E, Berndsen CE, Wright NT, Malfatti E, Brochier G, Pierantozzi E, Jordanova A, Guergueltcheva V, Romero NB, Hackman P, Eymard B, Udd B, Sorrentino V. A novel FLNC frameshift and an OBSCN variant in a family with distal muscular dystrophy. PLoS One 2017; 12:e0186642. [PMID: 29073160 PMCID: PMC5657976 DOI: 10.1371/journal.pone.0186642] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 10/04/2017] [Indexed: 11/30/2022] Open
Abstract
A novel FLNC c.5161delG (p.Gly1722ValfsTer61) mutation was identified in two members of a French family affected by distal myopathy and in one healthy relative. This FLNC c.5161delG mutation is one nucleotide away from a previously reported FLNC mutation (c.5160delC) that was identified in patients and in asymptomatic carriers of three Bulgarian families with distal muscular dystrophy, indicating a low penetrance of the FLNC frameshift mutations. Given these similarities, we believe that the two FLNC mutations alone can be causative of distal myopathy without full penetrance. Moreover, comparative analysis of the clinical manifestations indicates that patients of the French family show an earlier onset and a complete segregation of the disease. As a possible explanation of this, the two French patients also carry a OBSCN c.13330C>T (p.Arg4444Trp) mutation. The p.Arg4444Trp variant is localized within the OBSCN Ig59 domain that, together with Ig58, binds to the ZIg9/ZIg10 domains of titin at Z-disks. Structural and functional studies indicate that this OBSCN p.Arg4444Trp mutation decreases titin binding by ~15-fold. On this line, we suggest that the combination of the OBSCN p.Arg4444Trp variant and of the FLNC c.5161delG mutation, can cooperatively affect myofibril stability and increase the penetrance of muscular dystrophy in the French family.
Collapse
Affiliation(s)
- Daniela Rossi
- Molecular Medicine Section, Department of Molecular and Developmental Medicine, University of Siena and Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Johanna Palmio
- Neuromuscular Research Center, Tampere University and University Hospital, Tampere, Finland
| | - Anni Evilä
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Lucia Galli
- Molecular Medicine Section, Department of Molecular and Developmental Medicine, University of Siena and Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Virginia Barone
- Molecular Medicine Section, Department of Molecular and Developmental Medicine, University of Siena and Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Tracy A. Caldwell
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, United States of America
| | - Rachel A. Policke
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, United States of America
| | - Esraa Aldkheil
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, United States of America
| | - Christopher E. Berndsen
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, United States of America
| | - Nathan T. Wright
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, United States of America
| | - Edoardo Malfatti
- Neuromuscular Morphology Unit, and Reference Center for Neuromuscular Diseases, Myology Institute, Groupe Hospitalier La Pitié-Salpêtrière, Paris, France
| | - Guy Brochier
- Neuromuscular Morphology Unit, and Reference Center for Neuromuscular Diseases, Myology Institute, Groupe Hospitalier La Pitié-Salpêtrière, Paris, France
| | - Enrico Pierantozzi
- Molecular Medicine Section, Department of Molecular and Developmental Medicine, University of Siena and Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Albena Jordanova
- Molecular Neurogenomics Group, University of Antwerp, Antwerp, Belgium
- Molecular Medicine Center, Department of Medical Chemistry and Biochemistry, Medical University-Sofia, Sofia, Bulgaria
| | | | - Norma Beatriz Romero
- Neuromuscular Morphology Unit, and Reference Center for Neuromuscular Diseases, Myology Institute, Groupe Hospitalier La Pitié-Salpêtrière, Paris, France
| | - Peter Hackman
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Bruno Eymard
- Neuromuscular Morphology Unit, and Reference Center for Neuromuscular Diseases, Myology Institute, Groupe Hospitalier La Pitié-Salpêtrière, Paris, France
| | - Bjarne Udd
- Neuromuscular Research Center, Tampere University and University Hospital, Tampere, Finland
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
- Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
| | - Vincenzo Sorrentino
- Molecular Medicine Section, Department of Molecular and Developmental Medicine, University of Siena and Azienda Ospedaliera Universitaria Senese, Siena, Italy
- * E-mail:
| |
Collapse
|
67
|
Unger A, Beckendorf L, Böhme P, Kley R, von Frieling-Salewsky M, Lochmüller H, Schröder R, Fürst DO, Vorgerd M, Linke WA. Translocation of molecular chaperones to the titin springs is common in skeletal myopathy patients and affects sarcomere function. Acta Neuropathol Commun 2017; 5:72. [PMID: 28915917 PMCID: PMC5603016 DOI: 10.1186/s40478-017-0474-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 09/09/2017] [Indexed: 12/16/2022] Open
Abstract
Myopathies encompass a wide variety of acquired and hereditary disorders. The pathomechanisms include structural and functional changes affecting, e.g., myofiber metabolism and contractile properties. In this study, we observed increased passive tension (PT) of skinned myofibers from patients with myofibrillar myopathy (MFM) caused by FLNC mutations (MFM-filaminopathy) and limb-girdle muscular dystrophy type-2A due to CAPN3 mutations (LGMD2A), compared to healthy control myofibers. Because the giant protein titin determines myofiber PT, we measured its molecular size and the titin-to-myosin ratio, but found no differences between myopathies and controls. All-titin phosphorylation and site-specific phosphorylation in the PEVK region were reduced in myopathy, which would be predicted to lower PT. Electron microscopy revealed extensive ultrastructural changes in myofibers of various hereditary myopathies and also suggested massive binding of proteins to the sarcomeric I-band region, presumably heat shock proteins (HSPs), which can translocate to elastic titin under stress conditions. Correlative immunofluorescence and immunoelectron microscopy showed that two small HSPs (HSP27 and αB-crystallin) and the ATP-dependent chaperone HSP90 translocated to the titin springs in myopathy. The small HSPs, but not HSP90, were upregulated in myopathic versus control muscles. The titin-binding pattern of chaperones was regularly observed in Duchenne muscular dystrophy (DMD), LGMD2A, MFM-filaminopathy, MFM-myotilinopathy, titinopathy, and inclusion body myopathy due to mutations in valosin-containing protein, but not in acquired sporadic inclusion body myositis. The three HSPs also associated with elastic titin in mouse models of DMD and MFM-filaminopathy. Mechanical measurements on skinned human myofibers incubated with exogenous small HSPs suggested that the elevated PT seen in myopathy is caused, in part, by chaperone-binding to the titin springs. Whereas this interaction may be protective in that it prevents sarcomeric protein aggregation, it also has detrimental effects on sarcomere function. Thus, we identified a novel pathological phenomenon common to many hereditary muscle disorders, which involves sarcomeric alterations.
Collapse
|
68
|
Papizan JB, Garry GA, Brezprozvannaya S, McAnally JR, Bassel-Duby R, Liu N, Olson EN. Deficiency in Kelch protein Klhl31 causes congenital myopathy in mice. J Clin Invest 2017; 127:3730-3740. [PMID: 28872460 DOI: 10.1172/jci93445] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 07/19/2017] [Indexed: 01/19/2023] Open
Abstract
Maintenance of muscle structure and function depends on the precise organization of contractile proteins into sarcomeres and coupling of the contractile apparatus to the sarcoplasmic reticulum (SR), which serves as the reservoir for calcium required for contraction. Several members of the Kelch superfamily of proteins, which modulate protein stability as substrate-specific adaptors for ubiquitination, have been implicated in sarcomere formation. The Kelch protein Klhl31 is expressed in a muscle-specific manner under control of the transcription factor MEF2. To explore its functions in vivo, we created a mouse model of Klhl31 loss of function using the CRISPR-Cas9 system. Mice lacking Klhl31 exhibited stunted postnatal skeletal muscle growth, centronuclear myopathy, central cores, Z-disc streaming, and SR dilation. We used proteomics to identify several candidate Klhl31 substrates, including Filamin-C (FlnC). In the Klhl31-knockout mice, FlnC protein levels were highly upregulated with no change in transcription, and we further demonstrated that Klhl31 targets FlnC for ubiquitination and degradation. These findings highlight a role for Klhl31 in the maintenance of skeletal muscle structure and provide insight into the mechanisms underlying congenital myopathies.
Collapse
|
69
|
González-Morales N, Holenka TK, Schöck F. Filamin actin-binding and titin-binding fulfill distinct functions in Z-disc cohesion. PLoS Genet 2017; 13:e1006880. [PMID: 28732005 PMCID: PMC5521747 DOI: 10.1371/journal.pgen.1006880] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 06/21/2017] [Indexed: 01/03/2023] Open
Abstract
Many proteins contribute to the contractile properties of muscles, most notably myosin thick filaments, which are anchored at the M-line, and actin thin filaments, which are anchored at the Z-discs that border each sarcomere. In humans, mutations in the actin-binding protein Filamin-C result in myopathies, but the underlying molecular function is not well understood. Here we show using Drosophila indirect flight muscle that the filamin ortholog Cheerio in conjunction with the giant elastic protein titin plays a crucial role in keeping thin filaments stably anchored at the Z-disc. We identify the filamin domains required for interaction with the titin ortholog Sallimus, and we demonstrate a genetic interaction of filamin with titin and actin. Filamin mutants disrupting the actin- or the titin-binding domain display distinct phenotypes, with Z-discs breaking up in parallel or perpendicularly to the myofibril, respectively. Thus, Z-discs require filamin to withstand the strong contractile forces acting on them. The Z-disc is a macromolecular complex required to attach and stabilize actin thin filaments in the sarcomere, the smallest contractile unit of striated muscles. Mutations in Z-disc-associated proteins typically result in muscle disorders. Dimeric filamin organizes actin filaments, localizes at the Z-disc in vertebrates and causes muscle disorders in humans when mutated. Despite its clinical relevance, the molecular function of filamin in the sarcomere is not well understood. Here we use Drosophila muscles and an array of filamin mutations to address the molecular and cell biological function of filamin in the sarcomere. We show that filamin mainly serves as a Z-disc cohesive element, binding both thin filaments and titin. This configuration enables filamin to act as a bridge between thin filaments and the elastic scaffold protein titin from the adjacent sarcomere, maintaining sarcomere stability during muscle contraction.
Collapse
Affiliation(s)
| | | | - Frieder Schöck
- Department of Biology, McGill University, Montreal, Quebec, Canada
| |
Collapse
|
70
|
Gómez J, Lorca R, Reguero JR, Morís C, Martín M, Tranche S, Alonso B, Iglesias S, Alvarez V, Díaz-Molina B, Avanzas P, Coto E. Screening of the Filamin C Gene in a Large Cohort of Hypertrophic Cardiomyopathy Patients. ACTA ACUST UNITED AC 2017; 10:CIRCGENETICS.116.001584. [PMID: 28356264 DOI: 10.1161/circgenetics.116.001584] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 01/11/2017] [Indexed: 01/26/2023]
Abstract
BACKGROUND Recent exome sequencing studies identified filamin C (FLNC) as a candidate gene for hypertrophic cardiomyopathy (HCM). Our aim was to determine the rate of FLNC candidate variants in a large cohort of HCM patients who were also sequenced for the main sarcomere genes. METHODS AND RESULTS A total of 448 HCM patients were next generation-sequenced (semiconductor chip technology) for the MYH7, MYBPC3, TNNT2, TNNI3, ACTC1, TNNC1, MYL2, MYL3, TPM1, and FLNC genes. We also sequenced 450 healthy controls from the same population. Based on the reported population frequencies, bioinformatic criteria, and familial segregation, we identified 20 FLNC candidate variants (13 new; 1 nonsense; and 19 missense) in 22 patients. Compared with the patients, only 1 of the control's missense variants was nonreported (P=0.007; Fisher exact probability test). Based on the familial segregation and the reported functional studies, 6 of the candidate variants (in 7 patients) were finally classified as likely pathogenic, 10 as variants of uncertain significance, and 4 as likely benign. CONCLUSIONS We provide a compelling evidence of the involvement of FLNC in the development of HCM. Most of the FLNC variants were associated with mild forms of HCM and a reduced penetrance, with few affected in the families to confirm the segregation. Our work, together with others who found FLNC variants among patients with dilated and restrictive cardiomyopathies, pointed to this gene as an important cause of structural cardiomyopathies.
Collapse
Affiliation(s)
- Juan Gómez
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Rebeca Lorca
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Julian R Reguero
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - César Morís
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - María Martín
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Salvador Tranche
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Belén Alonso
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Sara Iglesias
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Victoria Alvarez
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Beatriz Díaz-Molina
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Pablo Avanzas
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.)
| | - Eliecer Coto
- From the Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias, Oviedo, Spain (J.G., R.L., J.R.R., C.M., M.M., B.A., S.I., V.A., B.D.-M., P.A., E.C.); Fundación Asturcor, Spain (J.R.R., C.M.); Departamento de Medicina, Universidad de Oviedo, Spain (C.M., E.C.); Centro Salud El Cristo, Oviedo, Spain (S.T.); and Red de Investigación Renal (REDINREN), Madrid, Spain (E.C.).
| |
Collapse
|
71
|
Reimann L, Wiese H, Leber Y, Schwäble AN, Fricke AL, Rohland A, Knapp B, Peikert CD, Drepper F, van der Ven PFM, Radziwill G, Fürst DO, Warscheid B. Myofibrillar Z-discs Are a Protein Phosphorylation Hot Spot with Protein Kinase C (PKCα) Modulating Protein Dynamics. Mol Cell Proteomics 2016; 16:346-367. [PMID: 28028127 DOI: 10.1074/mcp.m116.065425] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 11/06/2022] Open
Abstract
The Z-disc is a protein-rich structure critically important for the development and integrity of myofibrils, which are the contractile organelles of cross-striated muscle cells. We here used mouse C2C12 myoblast, which were differentiated into myotubes, followed by electrical pulse stimulation (EPS) to generate contracting myotubes comprising mature Z-discs. Using a quantitative proteomics approach, we found significant changes in the relative abundance of 387 proteins in myoblasts versus differentiated myotubes, reflecting the drastic phenotypic conversion of these cells during myogenesis. Interestingly, EPS of differentiated myotubes to induce Z-disc assembly and maturation resulted in increased levels of proteins involved in ATP synthesis, presumably to fulfill the higher energy demand of contracting myotubes. Because an important role of the Z-disc for signal integration and transduction was recently suggested, its precise phosphorylation landscape further warranted in-depth analysis. We therefore established, by global phosphoproteomics of EPS-treated contracting myotubes, a comprehensive site-resolved protein phosphorylation map of the Z-disc and found that it is a phosphorylation hotspot in skeletal myocytes, underscoring its functions in signaling and disease-related processes. In an illustrative fashion, we analyzed the actin-binding multiadaptor protein filamin C (FLNc), which is essential for Z-disc assembly and maintenance, and found that PKCα phosphorylation at distinct serine residues in its hinge 2 region prevents its cleavage at an adjacent tyrosine residue by calpain 1. Fluorescence recovery after photobleaching experiments indicated that this phosphorylation modulates FLNc dynamics. Moreover, FLNc lacking the cleaved Ig-like domain 24 exhibited remarkably fast kinetics and exceedingly high mobility. Our data set provides research community resource for further identification of kinase-mediated changes in myofibrillar protein interactions, kinetics, and mobility that will greatly advance our understanding of Z-disc dynamics and signaling.
Collapse
Affiliation(s)
- Lena Reimann
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Heike Wiese
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Yvonne Leber
- ¶Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany
| | - Anja N Schwäble
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Anna L Fricke
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Anne Rohland
- ¶Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany
| | - Bettina Knapp
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Christian D Peikert
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Friedel Drepper
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
| | - Peter F M van der Ven
- ¶Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany
| | - Gerald Radziwill
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany.,§BIOSS Centre for Biological Signalling Studies, University of Freiburg
| | - Dieter O Fürst
- ¶Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany
| | - Bettina Warscheid
- From the ‡Department of Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany; .,§BIOSS Centre for Biological Signalling Studies, University of Freiburg
| |
Collapse
|
72
|
Ectopic overexpression of filamin C scaffolds MEK1/2 and ERK1/2 to promote the progression of human hepatocellular carcinoma. Cancer Lett 2016; 388:167-176. [PMID: 27919788 DOI: 10.1016/j.canlet.2016.11.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 11/27/2016] [Accepted: 11/28/2016] [Indexed: 12/21/2022]
Abstract
Hepatocellular carcinoma (HCC) invasion and metastasis are mediated by a complicated signal transduction network and downstream cytoskeletal and adhesion molecules. In this study, a microarray-based analysis revealed a dramatic increase in filamin C (FLNC), which is commonly expressed in muscle rather than in liver cells, in the two metastatic HCC cell lines MHCC97L and HCCLM3. Clinicopathological studies showed that increased FLNC expression was associated with microvascular invasion and poor prognosis. Specific hypomethylation was identified within the FLNC promoter region in HCC cell lines and patient tumor samples, which might contribute to the ectopic overexpression of FLNC. FLNC downregulation inhibited cell migration and impaired cell proliferation and promoted apoptosis. Mechanistic studies suggested that FLNC interacts with mitogen-activated extracellular signal-regulated kinase 1/2 (MEK1/2) and extracellular signal-regulated kinase 1/2 (ERK1/2) and that FLNC downregulation inhibited MEK1/2 and ERK1/2 activation. Xenographic tumor transplantation experiments in nude mice further confirmed the role of FLNC in HCC progression and metastasis. Our results reveal a novel mechanism by which the cytoskeletal protein FLNC enhances the mitogen-activated protein kinase signaling pathway during tumorigenesis.
Collapse
|
73
|
van den Bogaart FJA, Claeys KG, Kley RA, Kusters B, Schrading S, Kamsteeg EJ, Voermans NC. Widening the spectrum of filamin-C myopathy: Predominantly proximal myopathy due to the p.A193T mutation in the actin-binding domain of FLNC. Neuromuscul Disord 2016; 27:73-77. [PMID: 27816332 DOI: 10.1016/j.nmd.2016.09.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 09/13/2016] [Accepted: 09/20/2016] [Indexed: 12/13/2022]
Abstract
We report three patients with a predominantly proximal myopathy due to p.A193T mutation in the actin-binding domain of FLNC, which has so far only been associated with a distal myopathy. They presented with a late onset myopathy characterized by predominant limb-girdle and proximal weakness. We describe the clinical, electrophysiological, pathological, muscle imaging and genetic features. One of our patients did not have typical histological features for a myofibrillar myopathy in muscle biopsy. This observation is important for the recognition of the full clinical spectrum of filamin-C-related myopathies. Muscle imaging has an important role in distinguishing the different filamin-C myopathy types.
Collapse
Affiliation(s)
| | - Kristl G Claeys
- Department of Neurology and Institute of Neuropathology, RWTH Aachen University, Aachen, Germany; Department of Neurology, University Hospitals Leuven and University of Leuven (KU Leuven), Leuven, Belgium
| | - Rudolf A Kley
- Department of Neurology, Heimer Institute for Muscle Research, Ruhr-University Bochum, Bochum, Germany
| | - Benno Kusters
- Department of Pathology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Simone Schrading
- Department of Radiology, RWTH Aachen University, Aachen, Germany
| | - Erik J Kamsteeg
- Department of Human Genetics, Radboud University Medical Centre, The Netherlands
| | - Nicol C Voermans
- Department of Neurology, Radboud University Medical Centre, Nijmegen, The Netherlands.
| |
Collapse
|
74
|
Avila-Smirnow D, Gueneau L, Batonnet-Pichon S, Delort F, Bécane HM, Claeys K, Beuvin M, Goudeau B, Jais JP, Nelson I, Richard P, Ben Yaou R, Romero NB, Wahbi K, Mathis S, Voit T, Furst D, van der Ven P, Gil R, Vicart P, Fardeau M, Bonne G, Behin A. Cardiac arrhythmia and late-onset muscle weakness caused by a myofibrillar myopathy with unusual histopathological features due to a novel missense mutation in FLNC. Rev Neurol (Paris) 2016; 172:594-606. [PMID: 27633507 DOI: 10.1016/j.neurol.2016.07.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Revised: 07/16/2016] [Accepted: 07/26/2016] [Indexed: 11/29/2022]
Abstract
Myofibrillar myopathies (MFM) are mostly adult-onset diseases characterized by progressive morphological alterations of the muscle fibers beginning in the Z-disk and the presence of protein aggregates in the sarcoplasm. They are mostly caused by mutations in different genes that encode Z-disk proteins, including DES, CRYAB, LDB3, MYOT, FLNC and BAG3. A large family of French origin, presenting an autosomal dominant pattern, characterized by cardiac arrhythmia associated to late-onset muscle weakness, was evaluated to clarify clinical, morphological and genetic diagnosis. Muscle weakness began during adult life (over 30 years of age), and had a proximal distribution. Histology showed clear signs of a myofibrillar myopathy, but with unusual, large inclusions. Subsequently, genetic testing was performed in MFM genes available for screening at the time of clinical/histological diagnosis, and desmin (DES), αB-crystallin (CRYAB), myotilin (MYOT) and ZASP (LDB3), were excluded. LMNA gene screening found the p.R296C variant which did not co-segregate with the disease. Genome wide scan revealed linkage to 7q.32, containing the FLNC gene. FLNC direct sequencing revealed a heterozygous c.3646T>A p.Tyr1216Asn change, co-segregating with the disease, in a highly conserved amino acid of the protein. Normal filamin C levels were detected by Western-blot analysis in patient muscle biopsies and expression of the mutant protein in NIH3T3 showed filamin C aggregates. This is an original FLNC mutation in a MFM family with an atypical clinical and histopathological presentation, given the presence of significantly focal lesions and prominent sarcoplasmic masses in muscle biopsies and the constant heart involvement preceding significantly the onset of the myopathy. Though a rare etiology, FLNC gene should not be excluded in early-onset arrhythmia, even in the absence of myopathy, which occurs later in the disease course.
Collapse
Affiliation(s)
- D Avila-Smirnow
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - L Gueneau
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - S Batonnet-Pichon
- Sorbonne Paris Cité, université Paris Diderot, CNRS, unité de biologie fonctionnelle et adaptative, UMR 8251, 75013 Paris, France
| | - F Delort
- Sorbonne Paris Cité, université Paris Diderot, CNRS, unité de biologie fonctionnelle et adaptative, UMR 8251, 75013 Paris, France
| | - H-M Bécane
- AP-HP, groupe hospitalier Pitié-Salpêtrière, institut de myologie, centre de référence de pathologie neuromusculaire Paris-Est, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - K Claeys
- Groupe hospitalier Pitié-Salpêtrière, association institut de myologie, unité de morphologie neuromusculaire, 75013 Paris, France
| | - M Beuvin
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - B Goudeau
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - J-P Jais
- GH Necker Enfants-Malades, université Paris Descartes, faculté de médecine, biostatistique et informatique médicale, EA 4067, 75015 Paris, France
| | - I Nelson
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - P Richard
- AP-HP, groupe hospitalier Pitié-Salpêtrière, service de biochimie métabolique, U.F. cardiogénétique et myogénétique, 75013 Paris, France
| | - R Ben Yaou
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France; AP-HP, groupe hospitalier Pitié-Salpêtrière, institut de myologie, centre de référence de pathologie neuromusculaire Paris-Est, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - N B Romero
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France; Groupe hospitalier Pitié-Salpêtrière, association institut de myologie, unité de morphologie neuromusculaire, 75013 Paris, France
| | - K Wahbi
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France; AP-HP, groupe hospitalier Pitié-Salpêtrière, institut de myologie, centre de référence de pathologie neuromusculaire Paris-Est, 47-83, boulevard de l'Hôpital, 75013 Paris, France; AP-HP, groupe hospitalier Cochin-Broca-Hôtel Dieu, service de cardiologie, 75013 Paris, France
| | - S Mathis
- CHU de la Milétrie, service de neurologie, 86021 Poitiers, France
| | - T Voit
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France; AP-HP, groupe hospitalier Pitié-Salpêtrière, institut de myologie, centre de référence de pathologie neuromusculaire Paris-Est, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - D Furst
- University of Bonn, institute for cell biology, department of molecular cell biology, Bonn, Germany
| | - P van der Ven
- University of Bonn, institute for cell biology, department of molecular cell biology, Bonn, Germany
| | - R Gil
- CHU de la Milétrie, service de neurologie, 86021 Poitiers, France
| | - P Vicart
- Sorbonne Paris Cité, université Paris Diderot, CNRS, unité de biologie fonctionnelle et adaptative, UMR 8251, 75013 Paris, France
| | - M Fardeau
- Groupe hospitalier Pitié-Salpêtrière, association institut de myologie, unité de morphologie neuromusculaire, 75013 Paris, France
| | - G Bonne
- Sorbonne universités, UPMC Paris 06, center of research in myology, Inserm UMRS974, CNRS FRE3617, 75013 Paris, France
| | - A Behin
- AP-HP, groupe hospitalier Pitié-Salpêtrière, institut de myologie, centre de référence de pathologie neuromusculaire Paris-Est, 47-83, boulevard de l'Hôpital, 75013 Paris, France.
| |
Collapse
|
75
|
Congenital dilated cardiomyopathy caused by biallelic mutations in Filamin C. Eur J Hum Genet 2016; 24:1792-1796. [PMID: 27601210 DOI: 10.1038/ejhg.2016.110] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 07/06/2016] [Accepted: 07/19/2016] [Indexed: 11/09/2022] Open
Abstract
In the vast majority of pediatric patients with dilated cardiomyopathy, the specific etiology is unknown. Studies on families with dilated cardiomyopathy have exemplified the role of genetic factors in cardiomyopathy etiology. In this study, we applied whole-exome sequencing to members of a non-consanguineous family affected by a previously unreported congenital dilated cardiomyopathy syndrome necessitating early-onset heart transplant. Exome analysis identified compound heterozygous variants in the FLNC gene. Histological analysis of the cardiac muscle demonstrated marked sarcomeric and myofibrillar abnormalities, and immunohistochemical staining demonstrated the presence of Filamin C aggregates in cardiac myocytes. We conclude that biallelic variants in FLNC can cause congenital dilated cardiomyopathy. As the associated clinical features of affected patients are mild, and can be easily overlooked, testing for FLNC should be considered in children presenting with dilated cardiomyopathy.
Collapse
|
76
|
Jaafar N, Gómez J, Kammoun I, Zairi I, Amara WB, Kachboura S, Kraiem S, Hammami M, Iglesias S, Alonso B, Coto E. Spectrum of Mutations in Hypertrophic Cardiomyopathy Genes Among Tunisian Patients. Genet Test Mol Biomarkers 2016; 20:674-679. [PMID: 27574918 DOI: 10.1089/gtmb.2016.0187] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Hypertrophic cardiomyopathy (HCM) is a common cardiac genetic disorder associated with heart failure and sudden death. Mutations in the cardiac sarcomere genes are found in approximately half of HCM patients and are more common among cases with a family history of the disease. Data about the mutational spectrum of the sarcomeric genes in HCM patients from Northern Africa are limited. The population of Tunisia is particularly interesting due to its Berber genetic background. As founder mutations have been reported in other disorders. METHODS We performed semiconductor chip (Ion Torrent PGM) next generation sequencing of the nine main sarcomeric genes (MYH7, MYBPC3, TNNT2, TNNI3, ACTC1, TNNC1, MYL2, MYL3, TPM1) as well as the recently identified as an HCM gene, FLNC, in 45 Tunisian HCM patients. RESULTS We found sarcomere gene polymorphisms in 12 patients (27%), with MYBPC3 and MYH7 representing 83% (10/12) of the mutations. One patient was homozygous for a new MYL3 mutation and two were double MYBPC3 + MYH7 mutation carriers. Screening of the FLNC gene identified three new mutations, which points to FLNC mutations as an important cause of HCM among Tunisians. CONCLUSION The mutational background of HCM in Tunisia is heterogeneous. Unlike other Mendelian disorders, there were no highly prevalent mutations that could explain most of the cases. Our study also suggested that FLNC mutations may play a role on the risk for HCM among Tunisians.
Collapse
Affiliation(s)
- Nawel Jaafar
- 1 Biochemistry Laboratory LR12ES05 "Nutrition-Functional Food & Vascular Health," USCR Mass Spectrometry, Faculty of Medicine, University of Monastir , Monastir, Tunisia
| | - Juan Gómez
- 2 Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias , Oviedo, Spain
| | - Ikram Kammoun
- 3 Department of Cardiology, Abderrahmen Mami Hospital , Tunis, Tunisia
| | - Ihsen Zairi
- 4 Department of Cardiology, Habib Thameur Hospital , Tunis, Tunisia
| | - Wael Ben Amara
- 3 Department of Cardiology, Abderrahmen Mami Hospital , Tunis, Tunisia
| | - Salem Kachboura
- 3 Department of Cardiology, Abderrahmen Mami Hospital , Tunis, Tunisia
| | - Sondes Kraiem
- 4 Department of Cardiology, Habib Thameur Hospital , Tunis, Tunisia
| | - Mohamed Hammami
- 1 Biochemistry Laboratory LR12ES05 "Nutrition-Functional Food & Vascular Health," USCR Mass Spectrometry, Faculty of Medicine, University of Monastir , Monastir, Tunisia
| | - Sara Iglesias
- 2 Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias , Oviedo, Spain
| | - Belén Alonso
- 2 Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias , Oviedo, Spain
| | - Eliecer Coto
- 2 Unidad de Referencia de Cardiopatías Familiares-HUCA, Genética Molecular y Cardiología, Hospital Universitario Central Asturias , Oviedo, Spain .,5 Departamento de Medicina, Universidad de Oviedo , Oviedo, Spain
| |
Collapse
|
77
|
Begay RL, Tharp CA, Martin A, Graw SL, Sinagra G, Miani D, Sweet ME, Slavov DB, Stafford N, Zeller MJ, Alnefaie R, Rowland TJ, Brun F, Jones KL, Gowan K, Mestroni L, Garrity DM, Taylor MRG. FLNC Gene Splice Mutations Cause Dilated Cardiomyopathy. JACC Basic Transl Sci 2016; 1:344-359. [PMID: 28008423 PMCID: PMC5166708 DOI: 10.1016/j.jacbts.2016.05.004] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A genetic etiology has been identified in 30% to 40% of dilated cardiomyopathy (DCM) patients, yet only 50% of these cases are associated with a known causative gene variant. Thus, in order to understand the pathophysiology of DCM, it is necessary to identify and characterize additional genes. In this study, whole exome sequencing in combination with segregation analysis was used to identify mutations in a novel gene, filamin C (FLNC), resulting in a cardiac-restricted DCM pathology. Here we provide functional data via zebrafish studies and protein analysis to support a model implicating FLNC haploinsufficiency as a mechanism of DCM. Deoxyribonucleic acid obtained from 2 large DCM families was studied using whole-exome sequencing and cosegregation analysis resulting in the identification of a novel disease gene, FLNC. The 2 families, from the same Italian region, harbored the same FLNC splice-site mutation (FLNC c.7251+1G>A). A third U.S. family was then identified with a novel FLNC splice-site mutation (FLNC c.5669-1delG) that leads to haploinsufficiency as shown by the FLNC Western blot analysis of the heart muscle. The FLNC ortholog flncb morpholino was injected into zebrafish embryos, and when flncb was knocked down caused a cardiac dysfunction phenotype. On electron microscopy, the flncb morpholino knockdown zebrafish heart showed defects within the Z-discs and sarcomere disorganization.
Collapse
Affiliation(s)
- Rene L Begay
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Charles A Tharp
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - August Martin
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, CO
| | - Sharon L Graw
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Gianfranco Sinagra
- Cardiovascular Department, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Daniela Miani
- Department of Cardiothoracic Science, University Hospital S. Maria della Misericordia, Udine, Italy
| | - Mary E Sweet
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Dobromir B Slavov
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Neil Stafford
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, CO; Cardiovascular and Biofluid Mechanics Laboratory, Colorado State University, Fort Collins, CO
| | - Molly J Zeller
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, CO
| | - Rasha Alnefaie
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, CO
| | - Teisha J Rowland
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Francesca Brun
- Cardiovascular Department, Ospedali Riuniti and University of Trieste, Trieste, Italy
| | - Kenneth L Jones
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Aurora, CO
| | - Katherine Gowan
- Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Aurora, CO
| | - Luisa Mestroni
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| | - Deborah M Garrity
- Center for Cardiovascular Research and Department of Biology, Colorado State University, Fort Collins, CO
| | - Matthew R G Taylor
- Cardiovascular Institute and Adult Medical Genetics Program, University of Colorado Denver, Aurora, CO
| |
Collapse
|
78
|
Leber Y, Ruparelia AA, Kirfel G, van der Ven PFM, Hoffmann B, Merkel R, Bryson-Richardson RJ, Fürst DO. Filamin C is a highly dynamic protein associated with fast repair of myofibrillar microdamage. Hum Mol Genet 2016; 25:2776-2788. [PMID: 27206985 DOI: 10.1093/hmg/ddw135] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 04/26/2016] [Accepted: 04/27/2016] [Indexed: 11/12/2022] Open
Abstract
Filamin c (FLNc) is a large dimeric actin-binding protein located at premyofibrils, myofibrillar Z-discs and myofibrillar attachment sites of striated muscle cells, where it is involved in mechanical stabilization, mechanosensation and intracellular signaling. Mutations in the gene encoding FLNc give rise to skeletal muscle diseases and cardiomyopathies. Here, we demonstrate by fluorescence recovery after photobleaching that a large fraction of FLNc is highly mobile in cultured neonatal mouse cardiomyocytes and in cardiac and skeletal muscles of live transgenic zebrafish embryos. Analysis of cardiomyocytes from Xirp1 and Xirp2 deficient animals indicates that both Xin actin-binding repeat-containing proteins stabilize FLNc selectively in premyofibrils. Using a novel assay to analyze myofibrillar microdamage and subsequent repair in cultured contracting cardiomyocytes by live cell imaging, we demonstrate that repair of damaged myofibrils is achieved within only 4 h, even in the absence of de novo protein synthesis. FLNc is immediately recruited to these sarcomeric lesions together with its binding partner aciculin and precedes detectable assembly of filamentous actin and recruitment of other myofibrillar proteins. These data disclose an unprecedented degree of flexibility of the almost crystalline contractile machinery and imply FLNc as a dynamic signaling hub, rather than a primarily structural protein. Our myofibrillar damage/repair model illustrates how (cardio)myocytes are kept functional in their mechanically and metabolically strained environment. Our results help to better understand the pathomechanisms and pathophysiology of early stages of FLNc-related myofibrillar myopathy and skeletal and cardiac diseases preceding pathological protein aggregation.
Collapse
Affiliation(s)
- Yvonne Leber
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| | - Avnika A Ruparelia
- School of Biological Sciences, Monash University, Melbourne, Victoria 3800, Australia
| | - Gregor Kirfel
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| | - Peter F M van der Ven
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| | - Bernd Hoffmann
- Department of Biomechanics (ICS-7), Institute of Complex Systems, Forschungszentrum Jülich, D52428 Jülich, Germany and
| | - Rudolf Merkel
- Department of Biomechanics (ICS-7), Institute of Complex Systems, Forschungszentrum Jülich, D52428 Jülich, Germany and.,Department of Biomechanics, Institute for Physical and Theoretical Chemistry, University of Bonn, D53115 Bonn, Germany
| | | | - Dieter O Fürst
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, D53121 Bonn, Germany
| |
Collapse
|
79
|
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.
Collapse
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
| | | |
Collapse
|
80
|
Gómez J, Reguero JR, Coto E. Luces y sombras en el diagnóstico genético de la miocardiopatía hipertrófica. Rev Esp Cardiol 2016. [DOI: 10.1016/j.recesp.2015.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
81
|
Gómez J, Reguero JR, Coto E. The Ups and Downs of Genetic Diagnosis of Hypertrophic Cardiomyopathy. ACTA ACUST UNITED AC 2015; 69:61-8. [PMID: 26654849 DOI: 10.1016/j.rec.2015.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 10/07/2015] [Indexed: 01/16/2023]
Abstract
Massive DNA sequencing, also known as next-generation sequencing, has revolutionized genetic diagnosis. This technology has reduced the effort and cost needed to analyze several genes simultaneously and has made genetic evaluation available to a larger number of patients. In hypertrophic cardiomyopathy, genetic analysis has increased from the 3 main genes implicated in the disease (MYH7, MYBPC3, TNNT2) to sequencing of more than 20 related genes. Despite the advantages of acquiring this additional information, many patients show variants of uncertain significance (mainly amino acid changes), which may also be present in at least 1 healthy control undergoing genome sequencing. This will be a dead-end situation unless the variant can be demonstrated to be associated with the disease in the patient's family. In the absence of clear evidence that these variants are truly pathogenic, they cannot be used for reliable genetic counselling in family members. Massive sequencing also enables identification of new candidate genes, but again, the problem of variants of uncertain significance limits the success of these assessments.
Collapse
Affiliation(s)
- Juan Gómez
- Genética Molecular-Laboratorio de Medicina, Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain
| | - Julián R Reguero
- Cardiología-Fundación Asturcor, Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain
| | - Eliecer Coto
- Genética Molecular-Laboratorio de Medicina, Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain; Departamento de Medicina, Universidad de Oviedo, Oviedo, Asturias, Spain.
| |
Collapse
|
82
|
Qiao J, Cui SJ, Xu LL, Chen SJ, Yao J, Jiang YH, Peng G, Fang CY, Yang PY, Liu F. Filamin C, a dysregulated protein in cancer revealed by label-free quantitative proteomic analyses of human gastric cancer cells. Oncotarget 2015; 6:1171-89. [PMID: 25577646 PMCID: PMC4359225 DOI: 10.18632/oncotarget.2645] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 10/26/2014] [Indexed: 12/14/2022] Open
Abstract
Gastric cancer (GC) is the fourth and fifth most common cancer in men and women, respectively. We identified 2,750 proteins at false discovery rates of 1.3% (protein) and 0.03% (spectrum) by comparing the proteomic profiles of three GC and a normal gastric cell lines. Nine proteins were significantly dysregulated in all three GC cell lines, including filamin C, a muscle-specific filamin and a large actin-cross-linking protein. Downregulation of filamin C in GC cell lines and tissues were verified using quantitative PCR and immunohistochemistry. Data-mining using public microarray datasets shown that filamin C was significantly reduced in many human primary and metastasis cancers. Transient expression or silencing of filamin C affected the proliferation and colony formation of cancer cells. Silencing of endogenous filamin C enhanced cancer cell migration and invasion, whereas ectopic expression of filamin C had opposing effects. Silencing of filamin C increased the expression of matrix metallopeptidase 2 and improved the metastasis of prostate cancer in a zebrafish model. High filamin C associated with better prognosis of prostate cancer, leukemia and breast cancer patients. These findings establish a functional role of filamin C in human cancers and these data will be valuable for further study of its mechanisms.
Collapse
Affiliation(s)
- Jie Qiao
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Shu-Jian Cui
- College of Bioscience and Biotechnology, Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
| | - Lei-Lei Xu
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Si-Jie Chen
- Institutes of Brain Science, Fudan University, Shanghai 200032, China
| | - Jun Yao
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Ying-Hua Jiang
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Gang Peng
- Institutes of Brain Science, Fudan University, Shanghai 200032, China
| | - Cai-Yun Fang
- Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Peng-Yuan Yang
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China.,Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Feng Liu
- Department of Medical Systems Biology of School of Basic Medical Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
| |
Collapse
|
83
|
Janssens J, Philtjens S, Kleinberger G, Van Mossevelde S, van der Zee J, Cacace R, Engelborghs S, Sieben A, Banzhaf-Strathmann J, Dillen L, Merlin C, Cuijt I, Robberecht C, Schmid B, Santens P, Ivanoiu A, Vandenbulcke M, Vandenberghe R, Cras P, De Deyn PP, Martin JJ, Maudsley S, Haass C, Cruts M, Van Broeckhoven C. Investigating the role of filamin C in Belgian patients with frontotemporal dementia linked to GRN deficiency in FTLD-TDP brains. Acta Neuropathol Commun 2015; 3:68. [PMID: 26555887 PMCID: PMC4641381 DOI: 10.1186/s40478-015-0246-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 10/21/2015] [Indexed: 12/13/2022] Open
Abstract
TAR DNA-binding protein 43 (TDP-43) inclusions are pathological hallmarks of patients with frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS). Loss of TDP-43 in zebrafish engenders a severe muscle and vascular phenotype with a concomitant elevation of filamin C (FLNC) levels, an observation confirmed in the frontal cortex of FTLD-TDP patients. Here, we aimed to further assess the contribution of FLNC to frontotemporal dementia (FTD) etiology. We conducted a mutational screening of FLNC in a cohort of 529 unrelated Belgian FTD and FTD-ALS patients, and a control cohort of 920 unrelated and age-matched individuals. Additionally we performed an in-depth characterization of FLNC expression levels in FTD patients and a murine FTD model. In total 68 missense variants were identified of which 19 (MAF < 1 %) were patient-only. Gene burden analysis demonstrated a significant association between the presence of rare variants in FLNC and disease (P = 0.0349, RR = 1.46 [95 % CI 1.03–2.07]). Furthermore, elevated FLNC expression levels, observed previously in FTLD-TDP patients, were mainly attributable to FTD patients with the progranulin (GRN) p.0(IVS1 + 5G > C) loss-of-function mutation. Increased FLNC levels were, to a lesser extent, also identified in a FLNC p.V831I variant carrier and in FTD patients with the p.R159H mutation in valosin-containing protein (VCP). The GRN-associated increase of FLNC was confirmed in the frontal cortex of aged Grn knockout mice starting at 16–18 months of age. Combined quantitative proteomic and bioinformatic analyses of the frontal cortex of FTD patients possessing elevated FLNC levels, identified multiple altered protein factors involved in accelerated aging, neurodegeneration and synaptogenesis. Our findings further support the involvement of aberrant FLNC expression levels in FTD pathogenesis. Identification of increased FLNC levels in aged Grn mice and impaired pathways related to aging and neurodegeneration, implies a potential role for FLNC in mediating or accelerating the aging process.
Collapse
|
84
|
Chevessier F, Schuld J, Orfanos Z, Plank AC, Wolf L, Maerkens A, Unger A, Schlötzer-Schrehardt U, Kley RA, Von Hörsten S, Marcus K, Linke WA, Vorgerd M, van der Ven PFM, Fürst DO, Schröder R. Myofibrillar instability exacerbated by acute exercise in filaminopathy. Hum Mol Genet 2015; 24:7207-20. [PMID: 26472074 DOI: 10.1093/hmg/ddv421] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 10/02/2015] [Indexed: 12/12/2022] Open
Abstract
Filamin C (FLNC) mutations in humans cause myofibrillar myopathy (MFM) and cardiomyopathy, characterized by protein aggregation and myofibrillar degeneration. We generated the first patient-mimicking knock-in mouse harbouring the most common disease-causing filamin C mutation (p.W2710X). These heterozygous mice developed muscle weakness and myofibrillar instability, with formation of filamin C- and Xin-positive lesions streaming between Z-discs. These lesions, which are distinct from the classical MFM protein aggregates by their morphology and filamentous appearance, were greatly increased in number upon acute physical exercise in the mice. This pathology suggests that mutant filamin influences the mechanical stability of myofibrillar Z-discs, explaining the muscle weakness in mice and humans. Re-evaluation of biopsies from MFM-filaminopathy patients with different FLNC mutations revealed a similar, previously unreported lesion pathology, in addition to the classical protein aggregates, and suggested that structures previously interpreted as aggregates may be in part sarcomeric lesions. We postulate that these lesions define preclinical disease stages, preceding the formation of protein aggregates.
Collapse
Affiliation(s)
| | - Julia Schuld
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, Bonn, Germany
| | - Zacharias Orfanos
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, Bonn, Germany
| | - Anne-C Plank
- Department for Experimental Therapy, Preclinical Experimental Animal Center and
| | | | - Alexandra Maerkens
- Department of Neurology, Neuromuscular Center Ruhrgebiet, University Hospital Bergmannsheil, Department of Functional Proteomics, Medizinisches Proteom-Center and
| | - Andreas Unger
- Department of Cardiovascular Physiology, Ruhr-University Bochum, Bochum, Germany
| | | | - Rudolf A Kley
- Department of Neurology, Neuromuscular Center Ruhrgebiet, University Hospital Bergmannsheil
| | - Stephan Von Hörsten
- Department for Experimental Therapy, Preclinical Experimental Animal Center and
| | - Katrin Marcus
- Department of Functional Proteomics, Medizinisches Proteom-Center and
| | - Wolfgang A Linke
- Department of Cardiovascular Physiology, Ruhr-University Bochum, Bochum, Germany
| | - Matthias Vorgerd
- Department of Neurology, Neuromuscular Center Ruhrgebiet, University Hospital Bergmannsheil
| | - Peter F M van der Ven
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, Bonn, Germany
| | - Dieter O Fürst
- Department of Molecular Cell Biology, Institute for Cell Biology, University of Bonn, Bonn, Germany,
| | | |
Collapse
|
85
|
Bührdel JB, Hirth S, Kessler M, Westphal S, Forster M, Manta L, Wiche G, Schoser B, Schessl J, Schröder R, Clemen CS, Eichinger L, Fürst DO, van der Ven PFM, Rottbauer W, Just S. In vivo characterization of human myofibrillar myopathy genes in zebrafish. Biochem Biophys Res Commun 2015; 461:217-23. [PMID: 25866181 DOI: 10.1016/j.bbrc.2015.03.149] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 03/26/2015] [Indexed: 01/31/2023]
Abstract
Myofibrillar myopathies (MFM) are progressive diseases of human heart and skeletal muscle with a severe impact on life quality and expectancy of affected patients. Although recently several disease genes for myofibrillar myopathies could be identified, today most genetic causes and particularly the associated mechanisms and signaling events that lead from the mutation to the disease phenotype are still mostly unknown. To assess whether the zebrafish is a suitable model system to validate MFM candidate genes using targeted antisense-mediated knock-down strategies, we here specifically inactivated known human MFM disease genes and evaluated the resulting muscular and cardiac phenotypes functionally and structurally. Consistently, targeted ablation of MFM genes in zebrafish led to compromised skeletal muscle function mostly due to myofibrillar degeneration as well as severe heart failure. Similar to what was shown in MFM patients, MFM gene-deficient zebrafish showed pronounced gene-specific phenotypic and structural differences. In summary, our results indicate that the zebrafish is a suitable model to functionally and structurally evaluate novel MFM disease genes in vivo.
Collapse
Affiliation(s)
- John B Bührdel
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Sofia Hirth
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Mirjam Kessler
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Sören Westphal
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Monika Forster
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Linda Manta
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany
| | - Gerhard Wiche
- Department of Biochemistry and Cell Biology, Max F. Perutz Laboratories, University of Vienna, 1030 Vienna, Austria
| | - Benedikt Schoser
- Department of Neurology, Friedrich-Baur-Institut, Ludwig-Maximilians-University, Munich, Germany
| | - Joachim Schessl
- Department of Neurology, Friedrich-Baur-Institut, Ludwig-Maximilians-University, Munich, Germany
| | - Rolf Schröder
- Institute of Neuropathology, University Hospital Erlangen, 91054 Erlangen, Germany
| | - Christoph S Clemen
- Institute for Biochemistry I, University of Cologne, 50931 Köln, Germany
| | - Ludwig Eichinger
- Institute for Biochemistry I, University of Cologne, 50931 Köln, Germany
| | - Dieter O Fürst
- Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany
| | | | - Wolfgang Rottbauer
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany.
| | - Steffen Just
- Department of Internal Medicine II, University of Ulm, 89081 Ulm, Germany.
| |
Collapse
|
86
|
Zebrafish models of BAG3 myofibrillar myopathy suggest a toxic gain of function leading to BAG3 insufficiency. Acta Neuropathol 2014; 128:821-33. [PMID: 25273835 DOI: 10.1007/s00401-014-1344-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 09/22/2014] [Accepted: 09/22/2014] [Indexed: 12/16/2022]
Abstract
Mutations in the co-chaperone Bcl2-associated athanogene 3 (BAG3) can cause myofibrillar myopathy (MFM), a childhood-onset progressive muscle disease, characterized by the formation of protein aggregates and myofibrillar disintegration. In contrast to other MFM-causing proteins, BAG3 has no direct structural role, but regulates autophagy and the degradation of misfolded proteins. To investigate the mechanism of disease in BAG3-related MFM, we expressed wild-type BAG3 or the dominant MFM-causing BAG3 (BAG3(P209L)) in zebrafish. Expression of the mutant protein results in the formation of aggregates that contain wild-type BAG3. Through the stimulation and inhibition of autophagy, we tested the prevailing hypothesis that impaired autophagic function is responsible for the formation of protein aggregates. Contrary to the existing theory, our studies reveal that inhibition of autophagy is not sufficient to induce protein aggregation. Expression of the mutant protein, however, did not induce myofibrillar disintegration and we therefore examined the effect of knocking down Bag3 function. Loss of Bag3 resulted in myofibrillar disintegration, but not in the formation of protein aggregates. Remarkably, BAG3(P209L) is able to rescue the myofibrillar disintegration phenotype, further demonstrating that its function is not impaired. Together, our knockdown and overexpression experiments identify a mechanism whereby BAG3(P209L) aggregates form, gradually reducing the pool of available BAG3, which eventually results in BAG3 insufficiency and myofibrillar disintegration. This mechanism is consistent with the childhood onset and progressive nature of MFM and suggests that reducing aggregation through enhanced degradation or inhibition of nucleation would be an effective therapy for this disease.
Collapse
|
87
|
Valdés-Mas R, Gutiérrez-Fernández A, Gómez J, Coto E, Astudillo A, Puente DA, Reguero JR, Álvarez V, Morís C, León D, Martín M, Puente XS, López-Otín C. Mutations in filamin C cause a new form of familial hypertrophic cardiomyopathy. Nat Commun 2014; 5:5326. [PMID: 25351925 DOI: 10.1038/ncomms6326] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 09/19/2014] [Indexed: 01/21/2023] Open
Abstract
Mutations in different genes encoding sarcomeric proteins are responsible for 50-60% of familial cases of hypertrophic cardiomyopathy (HCM); however, the genetic alterations causing the disease in one-third of patients are currently unknown. Here we describe a case with familial HCM of unknown cause. Whole-exome sequencing reveals a variant in the gene encoding the sarcomeric protein filamin C (p.A1539T) that segregates with the disease in this family. Sequencing of 92 HCM cases identifies seven additional variants segregating with the disease in eight families. Patients with FLNC mutations show marked sarcomeric abnormalities in cardiac muscle, and functional analysis reveals that expression of these FLNC variants resulted in the formation of large filamin C aggregates. Clinical studies indicate that FLNC-mutated patients have higher incidence of sudden cardiac death. On the basis of these findings, we conclude that mutations in the gene encoding the sarcomeric protein filamin C cause a new form of familial HMC.
Collapse
Affiliation(s)
- Rafael Valdés-Mas
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología-IUOPA, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Ana Gutiérrez-Fernández
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología-IUOPA, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Juan Gómez
- Genética Molecular, Red de Investigación Renal (REDINREN), 33006 Oviedo, Spain
| | - Eliecer Coto
- 1] Genética Molecular, Red de Investigación Renal (REDINREN), 33006 Oviedo, Spain [2] Departamento de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Aurora Astudillo
- Servicio de Anatomía Patológica, Hospital Universitario Central de Asturias, 33006 Oviedo, Spain
| | - Diana A Puente
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología-IUOPA, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Julián R Reguero
- Servicio de Cardiología, Fundación Asturcor, Hospital Universitario Central de Asturias, 33006 Oviedo, Spain
| | - Victoria Álvarez
- Genética Molecular, Red de Investigación Renal (REDINREN), 33006 Oviedo, Spain
| | - César Morís
- 1] Departamento de Medicina, Universidad de Oviedo, 33006 Oviedo, Spain [2] Servicio de Cardiología, Fundación Asturcor, Hospital Universitario Central de Asturias, 33006 Oviedo, Spain
| | - Diego León
- Servicio de Cardiología, Fundación Asturcor, Hospital Universitario Central de Asturias, 33006 Oviedo, Spain
| | - María Martín
- Servicio de Cardiología, Fundación Asturcor, Hospital Universitario Central de Asturias, 33006 Oviedo, Spain
| | - Xose S Puente
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología-IUOPA, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Carlos López-Otín
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Instituto Universitario de Oncología-IUOPA, Universidad de Oviedo, 33006 Oviedo, Spain
| |
Collapse
|
88
|
Golbus JR, Puckelwartz MJ, Dellefave-Castillo L, Fahrenbach JP, Nelakuditi V, Pesce LL, Pytel P, McNally EM. Targeted analysis of whole genome sequence data to diagnose genetic cardiomyopathy. ACTA ACUST UNITED AC 2014; 7:751-759. [PMID: 25179549 DOI: 10.1161/circgenetics.113.000578] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Cardiomyopathy is highly heritable but genetically diverse. At present, genetic testing for cardiomyopathy uses targeted sequencing to simultaneously assess the coding regions of >50 genes. New genes are routinely added to panels to improve the diagnostic yield. With the anticipated $1000 genome, it is expected that genetic testing will shift toward comprehensive genome sequencing accompanied by targeted gene analysis. Therefore, we assessed the reliability of whole genome sequencing and targeted analysis to identify cardiomyopathy variants in 11 subjects with cardiomyopathy. METHODS AND RESULTS Whole genome sequencing with an average of 37× coverage was combined with targeted analysis focused on 204 genes linked to cardiomyopathy. Genetic variants were scored using multiple prediction algorithms combined with frequency data from public databases. This pipeline yielded 1 to 14 potentially pathogenic variants per individual. Variants were further analyzed using clinical criteria and segregation analysis, where available. Three of 3 previously identified primary mutations were detected by this analysis. In 6 subjects for whom the primary mutation was previously unknown, we identified mutations that segregated with disease, had clinical correlates, and had additional pathological correlation to provide evidence for causality. For 2 subjects with previously known primary mutations, we identified additional variants that may act as modifiers of disease severity. In total, we identified the likely pathological mutation in 9 of 11 (82%) subjects. CONCLUSIONS These pilot data demonstrate that ≈30 to 40× coverage whole genome sequencing combined with targeted analysis is feasible and sensitive to identify rare variants in cardiomyopathy-associated genes.
Collapse
Affiliation(s)
- Jessica R Golbus
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Megan J Puckelwartz
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Lisa Dellefave-Castillo
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - John P Fahrenbach
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Viswateja Nelakuditi
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Lorenzo L Pesce
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Peter Pytel
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| | - Elizabeth M McNally
- Department of Medicine, Department of Human Genetics, Department of Pathology, The Computation Institute, The University of Chicago & Argonne National Laboratories, Chicago, IL
| |
Collapse
|
89
|
Abstract
PURPOSE OF REVIEW Myofibrillar myopathies (MFMs) are a heterogeneous group of skeletal and cardiac muscle diseases. In this review, we highlight recent discoveries of new genes and disease mechanisms involved in this group of disorders. RECENT FINDINGS The advent of next-generation sequencing technology, laser microdissection and mass spectrometry-based proteomics has facilitated the discovery of new MFM causative genes and pathomechanisms. New mutations have also been discovered in 'older' genes, helping to find a classification niche for MFM-linked disorders showing variant phenotypes. Cell transfection experiments using primary cultured myoblasts and newer animal models provide insights into the pathogenesis of MFMs. SUMMARY An increasing number of genes are involved in the causation of variant subtypes of MFM. The application of modern technologies in combination with classical histopathological and ultrastructural studies is helping to establish the molecular diagnosis and reach a better understanding of the pathogenic mechanisms of each MFM subtype, thus putting an emphasis on the development of specific means for prevention and therapy of these incapacitating and frequently fatal diseases.
Collapse
|
90
|
Sethi R, Seppälä J, Tossavainen H, Ylilauri M, Ruskamo S, Pentikäinen OT, Pentikäinen U, Permi P, Ylänne J. A novel structural unit in the N-terminal region of filamins. J Biol Chem 2014; 289:8588-98. [PMID: 24469451 DOI: 10.1074/jbc.m113.537456] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Immunoglobulin-like (Ig) domains are a widely expanded superfamily that act as interaction motifs or as structural spacers in multidomain proteins. Vertebrate filamins (FLNs), which are multifunctional actin-binding proteins, consist of 24 Ig domains. We have recently discovered that in the C-terminal rod 2 region of FLN, Ig domains interact with each other forming functional domain pairs, where the interaction with signaling and transmembrane proteins is mechanically regulated by weak actomyosin contraction forces. Here, we investigated if there are similar inter-domain interactions around domain 4 in the N-terminal rod 1 region of FLN. Protein crystal structures revealed a new type of domain organization between domains 3, 4, and 5. In this module, domains 4 and 5 interact rather tightly, whereas domain 3 has a partially flexible interface with domain 4. NMR peptide titration experiments showed that within the three-domain module, domain 4 is capable for interaction with a peptide derived from platelet glycoprotein Ib. Crystal structures of FLN domains 4 and 5 in complex with the peptide revealed a typical β sheet augmentation interaction observed for many FLN ligands. Domain 5 was found to stabilize domain 4, and this could provide a mechanism for the regulation of domain 4 interactions.
Collapse
Affiliation(s)
- Ritika Sethi
- From the Department of Biological and Environmental Science and Nanoscience Center, University of Jyväskylä, P. O. Box 35, Survontie 9, 40014 Jyväskylä
| | | | | | | | | | | | | | | | | |
Collapse
|
91
|
Théron L, Gueugneau M, Coudy C, Viala D, Bijlsma A, Butler-Browne G, Maier A, Béchet D, Chambon C. Label-free quantitative protein profiling of vastus lateralis muscle during human aging. Mol Cell Proteomics 2013; 13:283-94. [PMID: 24217021 DOI: 10.1074/mcp.m113.032698] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Sarcopenia corresponds to the loss of muscle mass occurring during aging, and is associated with a loss of muscle functionality. Proteomic links the muscle functional changes with protein expression pattern. To better understand the mechanisms involved in muscle aging, we performed a proteomic analysis of Vastus lateralis muscle in mature and older women. For this, a shotgun proteomic method was applied to identify soluble proteins in muscle, using a combination of high performance liquid chromatography and mass spectrometry. A label-free protein profiling was then conducted to quantify proteins and compare profiles from mature and older women. This analysis showed that 35 of the 366 identified proteins were linked to aging in muscle. Most of the proteins were under-represented in older compared with mature women. We built a functional interaction network linking the proteins differentially expressed between mature and older women. The results revealed that the main differences between mature and older women were defined by proteins involved in energy metabolism and proteins from the myofilament and cytoskeleton. This is the first time that label-free quantitative proteomics has been applied to study of aging mechanisms in human skeletal muscle. This approach highlights new elements for elucidating the alterations observed during aging and may lead to novel sarcopenia biomarkers.
Collapse
Affiliation(s)
- Laëtitia Théron
- INRA, Plateforme d'Exploration du Métabolisme (PFEM), composante protéomique, F-63122 Saint Genès Champanelle, France
| | | | | | | | | | | | | | | | | |
Collapse
|
92
|
Maerkens A, Kley RA, Olivé M, Theis V, van der Ven PFM, Reimann J, Milting H, Schreiner A, Uszkoreit J, Eisenacher M, Barkovits K, Güttsches AK, Tonillo J, Kuhlmann K, Meyer HE, Schröder R, Tegenthoff M, Fürst DO, Müller T, Goldfarb LG, Vorgerd M, Marcus K. Differential proteomic analysis of abnormal intramyoplasmic aggregates in desminopathy. J Proteomics 2013; 90:14-27. [PMID: 23639843 DOI: 10.1016/j.jprot.2013.04.026] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 04/03/2013] [Accepted: 04/18/2013] [Indexed: 11/27/2022]
Abstract
UNLABELLED Desminopathy is a subtype of myofibrillar myopathy caused by desmin mutations and characterized by protein aggregates accumulating in muscle fibers. The aim of this study was to assess the protein composition of these aggregates. Aggregates and intact myofiber sections were obtained from skeletal muscle biopsies of five desminopathy patients by laser microdissection and analyzed by a label-free spectral count-based proteomic approach. We identified 397 proteins with 22 showing significantly higher spectral indices in aggregates (ratio >1.8, p<0.05). Fifteen of these proteins not previously reported as specific aggregate components provide new insights regarding pathomechanisms of desminopathy. Results of proteomic analysis were supported by immunolocalization studies and parallel reaction monitoring. Three mutant desmin variants were detected directly on the protein level as components of the aggregates, suggesting their direct involvement in aggregate-formation and demonstrating for the first time that proteomic analysis can be used for direct identification of a disease-causing mutation in myofibrillar myopathy. Comparison of the proteomic results in desminopathy with our previous analysis of aggregate composition in filaminopathy, another myofibrillar myopathy subtype, allows to determine subtype-specific proteomic profile that facilitates identification of the specific disorder. BIOLOGICAL SIGNIFICANCE Our proteomic analysis provides essential new insights in the composition of pathological protein aggregates in skeletal muscle fibers of desminopathy patients. The results contribute to a better understanding of pathomechanisms in myofibrillar myopathies and provide the basis for hypothesis-driven studies. The detection of specific proteomic profiles in different myofibrillar myopathy subtypes indicates that proteomic analysis may become a useful tool in differential diagnosis of protein aggregate myopathies.
Collapse
Affiliation(s)
- A Maerkens
- Department of Neurology, Neuromuscular Centre Ruhrgebiet, University Hospital Bergmannsheil, Ruhr-University Bochum, Bochum, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|