1
|
Liang H, Liu D, Gao Q, Zhai Z. TTN-related hereditary myopathy with early respiratory failure presented with elevated hemoglobin initially: A case report and literature review. Heliyon 2024; 10:e29637. [PMID: 38655354 PMCID: PMC11035038 DOI: 10.1016/j.heliyon.2024.e29637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 03/12/2024] [Accepted: 04/11/2024] [Indexed: 04/26/2024] Open
Abstract
Background As common abnormal conditions in clinical practice, hypoxemia and respiratory failure are mainly caused by various respiratory diseases. However, other causes are easily overlooked but deserve more attention from doctors. Case presentation A 44-year-old man presented with dyspnea for 10 years. In the early stage, his dyspnea was mild without hypoxemia, and he was misdiagnosed with polycythemia vera due to elevated hemoglobin level. He later developed to respiratory failure but he did not have weakness in his extremities. The positional difference in pulmonary function tests and arterial blood gas analysis led us to identify the respiratory muscle dysfunction. Fatty infiltration of the thigh muscle found by magnetic resonance imaging and muscle biopsies gave us more clues to the causes of diaphragmatic dysfunction. Finally, in combination with his family history and the results of whole exome sequencing, he was diagnosed with hereditary myopathy with early respiratory failure (HMERF, OMIM 603689) caused by a variant in the titin gene (TTN). Conclusions We have identified a Chinese family with HMERF due to genetic variants in TTN NM_001256850.1: c.90272C > T, p. Pro30091Leu, located at g.179410829A > G on chromosome 2 (GRCh37), which may be specifically associated with the diagrammatic dysfunction. And hyperhemoglobinemia could serve as a potential sign for the early identification of HMERF.
Collapse
Affiliation(s)
- Hanyang Liang
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, National Center for Respiratory Medicine Institute of Respiratory Medicine, Chinese Academy of Medical Sciences National Clinical Research Center for Respiratory Diseases, Beijing 100029, China
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Dong Liu
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, National Center for Respiratory Medicine Institute of Respiratory Medicine, Chinese Academy of Medical Sciences National Clinical Research Center for Respiratory Diseases, Beijing 100029, China
- Peking University China-Japan Friendship School of Clinical Medicine, Beijing 100029, China
| | - Qian Gao
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, National Center for Respiratory Medicine Institute of Respiratory Medicine, Chinese Academy of Medical Sciences National Clinical Research Center for Respiratory Diseases, Beijing 100029, China
| | - Zhenguo Zhai
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, National Center for Respiratory Medicine Institute of Respiratory Medicine, Chinese Academy of Medical Sciences National Clinical Research Center for Respiratory Diseases, Beijing 100029, China
- Peking University China-Japan Friendship School of Clinical Medicine, Beijing 100029, China
| |
Collapse
|
2
|
Weston TGR, Rees M, Gautel M, Fraternali F. Walking with giants: The challenges of variant impact assessment in the giant sarcomeric protein titin. WIREs Mech Dis 2024; 16:e1638. [PMID: 38155593 DOI: 10.1002/wsbm.1638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/30/2023]
Abstract
Titin, the so-called "third filament" of the sarcomere, represents a difficult challenge for the determination of damaging genetic variants. A single titin molecule extends across half the length of a sarcomere in striated muscle, fulfilling a variety of vital structural and signaling roles, and has been linked to an equally varied range of myopathies, resulting in a significant burden on individuals and healthcare systems alike. While the consequences of truncating variants of titin are well-documented, the ramifications of the missense variants prevalent in the general population are less so. We here present a compendium of titin missense variants-those that result in a single amino-acid substitution in coding regions-reported to be pathogenic and discuss these in light of the nature of titin and the variant position within the sarcomere and their domain, the structural, pathological, and biophysical characteristics that define them, and the methods used for characterization. Finally, we discuss the current knowledge and integration of the multiple fields that have contributed to our understanding of titin-related pathology and offer suggestions as to how these concurrent methodologies may aid the further development in our understanding of titin and hopefully extend to other, less well-studied giant proteins. This article is categorized under: Cardiovascular Diseases > Genetics/Genomics/Epigenetics Congenital Diseases > Genetics/Genomics/Epigenetics Congenital Diseases > Molecular and Cellular Physiology.
Collapse
Affiliation(s)
- Timir G R Weston
- Randall Centre for Cell & Molecular Biophysics, King's College London, London, UK
| | - Martin Rees
- Randall Centre for Cell & Molecular Biophysics, King's College London, London, UK
| | - Mathias Gautel
- Randall Centre for Cell & Molecular Biophysics, King's College London, London, UK
| | - Franca Fraternali
- Institute of Structural and Molecular Biology, University College London, London, UK
| |
Collapse
|
3
|
Sano Y, Ota S, Oishi M, Honda M, Omoto M, Kawai M, Okubo M, Nishino I, Kanda T. A Japanese Patient with Hereditary Myopathy with Early Respiratory Failure Due to the p.P31732L Mutation of Titin. Intern Med 2022; 61:1587-1592. [PMID: 34670883 PMCID: PMC9177377 DOI: 10.2169/internalmedicine.7733-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Hereditary myopathy with early respiratory failure (HMERF) is caused by titin A-band mutations in exon 344 and is considered quite rare. Respiratory insufficiency can be the sole symptom in the disease course. We herein report the first Japanese HMERF patient with a p.P31732L mutation in titin. The patient manifested respiratory failure and mild weakness of the neck flexor muscle at 69 years old and showed fatty replacement of the bilateral semitendinosus muscles on muscle imaging. Our case indicates that HMERF with a heterozygous p.P31732L mutation should be included in the differential diagnosis of muscular diseases presenting with early respiratory failure.
Collapse
Affiliation(s)
- Yasuteru Sano
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| | - Satoko Ota
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
- Department of Neurology, Tokyo Metropolitan Neurological Hospital, Japan
| | - Mariko Oishi
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| | - Masaya Honda
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| | - Masatoshi Omoto
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| | - Motoharu Kawai
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| | - Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, Japan
| | - Takashi Kanda
- Department of Neurology and Clinical Neuroscience, Yamaguchi University Graduate School of Medicine, Japan
| |
Collapse
|
4
|
Clinical, pathological, and molecular genetic analysis of 7 Chinese patients with hereditary myopathy with early respiratory failure. Neurol Sci 2021; 43:3371-3380. [PMID: 34839411 DOI: 10.1007/s10072-021-05783-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/21/2021] [Indexed: 10/19/2022]
Abstract
Hereditary myopathy with early respiratory failure (HMERF) is a subtype of myofibrillar myopathy. Mutations located on exon 344 of the titin-A band, the 119th fibronectin-3 domain (FN3 119), are responsible for HMERF. In this article, we retrospectively analyzed the clinical features, findings of muscle imaging, muscle pathology, immunohistochemistry, and ultrastructural characteristics of seven patients diagnosed with HMERF at a single center in China. Muscle MRI showed the involvement of semitendinosus in four patients. The common pathological features were variability in fiber diameter, increased internal nuclei, endomysial fibrosis, and cytoplasmic bodies. On immunohistochemical examination, the cytoplasmic bodies stained positive for calpain-3, p53, and programmed death-ligand 1. Electron microscopy showed cytoplasmic bodies, distorted sarcomere architecture, glycogen pool, and subsarcolemmal accumulation of mitochondria and lysosomes. We retrospectively reviewed four reported HMERF patients in China. Among the 11 patients, the median age at onset was 34 years (range 14-54). Allelic frequency of mutation c.95195C > T was 36.36%. This study characterizes the phenotype and genotype spectrum of HMERF in China.
Collapse
|
5
|
Whole-exome sequencing in patients with protein aggregate myopathies reveals causative mutations associated with novel atypical phenotypes. Neurol Sci 2020; 42:2819-2827. [PMID: 33170376 PMCID: PMC7654353 DOI: 10.1007/s10072-020-04876-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 11/01/2020] [Indexed: 11/19/2022]
Abstract
Background Myofibrillar myopathies (MFM) are a subgroup of protein aggregate myopathies (PAM) characterized by a common histological picture of myofibrillar dissolution, Z-disk disintegration, and accumulation of degradation products into inclusions. Mutations in genes encoding components of the Z-disk or Z-disk-associated proteins occur in some patients whereas in most of the cases, the causative gene defect is still unknown. We aimed to search for pathogenic mutations in genes not previously associated with MFM phenotype. Methods We performed whole-exome sequencing in four patients from three unrelated families who were diagnosed with PAM without aberrations in causative genes for MFM. Results In the first patient and her affected daughter, we identified a heterozygous p.(Arg89Cys) missense mutation in LMNA gene which has not been linked with PAM pathology before. In the second patient, a heterozygous p.(Asn4807Phe) mutation in RYR1 not previously described in PAM represents a novel, candidate gene with a possible causative role in the disease. Finally, in the third patient and his symptomatic daughter, we found a previously reported heterozygous p.(Cys30071Arg) mutation in TTN gene that was clinically associated with cardiac involvement. Conclusions Our study identifies a new genetic background in PAM pathology and expands the clinical phenotype of known pathogenic mutations. Supplementary Information The online version contains supplementary material available at 10.1007/s10072-020-04876-7.
Collapse
|
6
|
Luo YB, Peng Y, Lu Y, Li Q, Duan H, Bi F, Yang H. Expanding the Clinico-Genetic Spectrum of Myofibrillar Myopathy: Experience From a Chinese Neuromuscular Center. Front Neurol 2020; 11:1014. [PMID: 33041974 PMCID: PMC7522348 DOI: 10.3389/fneur.2020.01014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 07/31/2020] [Indexed: 12/14/2022] Open
Abstract
Background: Myofibrillar myopathy is a group of hereditary neuromuscular disorders characterized by dissolution of myofibrils and abnormal intracellular accumulation of Z disc-related proteins. We aimed to characterize the clinical, physiological, pathohistological, and genetic features of Chinese myofibrillar myopathy patients from a single neuromuscular center. Methods: A total of 18 patients were enrolled. Demographic and clinical data were collected. Laboratory investigations, electromyography, and cardiac evaluation was performed. Routine and immunohistochemistry stainings against desmin, αB-crystallin, and BAG3 of muscle specimen were carried out. Finally, next-generation sequencing panel array for genes associated with hereditary neuromuscular disorders were performed. Results: Twelve pathogenic variants in DES, BAG3, FLNC, FHL1, and TTN were identified, of which seven were novel mutations. The novel DES c.1256C>T substitution is a high frequency mutation. The combined recessively/dominantly transmitted c.19993G>T and c.107545delG mutations in TTN gene cause a limb girdle muscular dystrophy phenotype with the classical myofibrillar myopathy histological changes. Conclusions: We report for the first time that hereditary myopathy with early respiratory failure patient can have peripheral nerve and severe spine involvement. The mutation in Ig-like domain 16 of FLNC is associated with the limb girdle type of filaminopathy, and the mutation in Ig-like domain 18 with distal myopathy type. These findings expand the phenotypic and genotypic correlation spectrum of myofibrillar myopathy.
Collapse
Affiliation(s)
- Yue-Bei Luo
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| | - Yuyao Peng
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| | - Yuling Lu
- Department of Neurology, the First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Qiuxiang Li
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| | - Huiqian Duan
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| | - Fangfang Bi
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| | - Huan Yang
- Department of Neurology, Xiangya Hospital, Central South Hospital, Changsha, China
| |
Collapse
|
7
|
Palmio J, Leonard-Louis S, Sacconi S, Savarese M, Penttilä S, Semmler AL, Kress W, Mozaffar T, Lai T, Stojkovic T, Berardo A, Reisin R, Attarian S, Urtizberea A, Cobo AM, Maggi L, Kurbatov S, Nikitin S, Milisenda JC, Fatehi F, Raimondi M, Silveira F, Hackman P, Claeys KG, Udd B. Expanding the importance of HMERF titinopathy: new mutations and clinical aspects. J Neurol 2019; 266:680-690. [PMID: 30666435 PMCID: PMC6394805 DOI: 10.1007/s00415-019-09187-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/03/2019] [Accepted: 01/03/2019] [Indexed: 02/08/2023]
Abstract
Objective Hereditary myopathy with early respiratory failure (HMERF) is caused by titin A-band mutations in exon 344 and considered quite rare. Respiratory insufficiency is an early symptom. A collection of families and patients with muscle disease suggestive of HMERF was clinically and genetically studied. Methods Altogether 12 new families with 19 affected patients and diverse nationalities were studied. Most of the patients were investigated using targeted next-generation sequencing; Sanger sequencing was applied in some of the patients and available family members. Histological data and muscle MRI findings were evaluated. Results Three families had several family members studied while the rest were single patients. Most patients had distal and proximal muscle weakness together with respiratory insufficiency. Five heterozygous TTN A-band mutations were identified of which two were novel. Also with the novel mutations the muscle pathology and imaging findings were compatible with the previous reports of HMERF. Conclusions Our collection of 12 new families expands mutational spectrum with two new mutations identified. HMERF is not that rare and can be found worldwide, but maybe underdiagnosed. Diagnostic process seems to be complex as this study shows with mostly single patients without clear dominant family history.
Collapse
Affiliation(s)
- Johanna Palmio
- Department of Neurology, Neuromuscular Research Center, Tampere University Hospital and University of Tampere, 33014, Tampere, Finland.
| | - Sarah Leonard-Louis
- Institute of Myology, National Reference Center for Neuromuscular Disorders, University Hospital of Salpêtrière, UPMC, Paris, France
| | - Sabrina Sacconi
- Nice University Hospital, Université Côte d'Azur, Nice, France
| | - Marco Savarese
- Folkhälsan Institute of Genetics and Medicum, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Sini Penttilä
- Department of Neurology, Neuromuscular Research Center, Tampere University Hospital and University of Tampere, 33014, Tampere, Finland
| | - Anna-Lena Semmler
- Department of Neurology, RWTH Aachen University, Aachen, Germany.,Institute of Neuropathology, RWTH Aachen University, Aachen, Germany
| | - Wolfram Kress
- Institute of Human Genetics, University of Würzburg, Würzburg, Germany
| | - Tahseen Mozaffar
- Neurology Department, University of California, Irvine, Orange, CA, USA
| | - Tim Lai
- Neurology Department, University of California, Irvine, Orange, CA, USA
| | - Tanya Stojkovic
- Center of Research in Myology, UPMC Univ Paris, INSERM UMRS, Institut de Myologie, Sorbonne Universités, Paris, France
| | - Andres Berardo
- Neuromuscular Unit, British Hospital, Buenos Aires, Argentina
| | - Ricardo Reisin
- Neuromuscular Unit, British Hospital, Buenos Aires, Argentina
| | - Shahram Attarian
- Reference Center for Neuromuscular Disorders and ALS, CHU La Timone 1338, Marseille, France
| | - Andoni Urtizberea
- Centre de Compétences Maladies Neuromusculaires Hendaye, Hendaye, France
| | - Ana Maria Cobo
- Centre de Compétences Maladies Neuromusculaires Hendaye, Hendaye, France
| | - Lorenzo Maggi
- Neuroimmunology and Neuromuscular Diseases Unit, Foundation IRCCS Neurological Institute Carlo Besta, Milan, Italy
| | - Sergei Kurbatov
- Regional Medical Diagnostic Centre, Voronezh, Russia.,Regional Non-governmental Organization «Society of Neuro-Muscular Diseases Specialists», Moscow, Russia
| | - Sergei Nikitin
- Regional Non-governmental Organization «Society of Neuro-Muscular Diseases Specialists», Moscow, Russia
| | - José C Milisenda
- Muscle Research Unit, Internal Medicine Service, Hospital Clínic de Barcelona and CIBERER, Barcelona, Spain
| | - Farzad Fatehi
- Iranian Center of Neurological Research, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Monika Raimondi
- Clinica Moncucco, Via Moncucco 10, 6900, Lugano, Switzerland
| | | | - Peter Hackman
- Folkhälsan Institute of Genetics and Medicum, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Kristl G Claeys
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium.,Laboratory for Muscle Diseases and Neuropathies, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Bjarne Udd
- Department of Neurology, Neuromuscular Research Center, Tampere University Hospital and University of Tampere, 33014, Tampere, Finland.,Folkhälsan Institute of Genetics and Medicum, Haartman Institute, University of Helsinki, Helsinki, Finland.,Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
| |
Collapse
|
8
|
Savarese M, Sarparanta J, Vihola A, Udd B, Hackman P. Increasing Role of Titin Mutations in Neuromuscular Disorders. J Neuromuscul Dis 2018; 3:293-308. [PMID: 27854229 PMCID: PMC5123623 DOI: 10.3233/jnd-160158] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The TTN gene with 363 coding exons encodes titin, a giant muscle protein spanning from the Z-disk to the M-band within the sarcomere. Mutations in the TTN gene have been associated with different genetic disorders, including hypertrophic and dilated cardiomyopathy and several skeletal muscle diseases. Before the introduction of next generation sequencing (NGS) methods, the molecular analysis of TTN has been laborious, expensive and not widely used, resulting in a limited number of mutations identified. Recent studies however, based on the use of NGS strategies, give evidence of an increasing number of rare and unique TTN variants. The interpretation of these rare variants of uncertain significance (VOUS) represents a challenge for clinicians and researchers. The main aim of this review is to describe the wide spectrum of muscle diseases caused by TTN mutations so far determined, summarizing the molecular findings as well as the clinical data, and to highlight the importance of joint efforts to respond to the challenges arising from the use of NGS. An international collaboration through a clinical and research consortium and the development of a single accessible database listing variants in the TTN gene, identified by high throughput approaches, may be the key to a better assessment of titinopathies and to systematic genotype– phenotype correlation studies.
Collapse
Affiliation(s)
- Marco Savarese
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Jaakko Sarparanta
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland.,Albert Einstein College of Medicine, Departments of Medicine- Endocrinology and Molecular Pharmacology, Bronx, NY, USA
| | - Anna Vihola
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland.,Neuromuscular Research Center, University of Tampere and Tampere University Hospital, Tampere, Finland.,Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
| | - Peter Hackman
- Folkhälsan Institute of Genetics and Department of Medical Genetics, Haartman Institute, University of Helsinki, Helsinki, Finland
| |
Collapse
|
9
|
Wang L, Geist J, Grogan A, Hu LYR, Kontrogianni-Konstantopoulos A. Thick Filament Protein Network, Functions, and Disease Association. Compr Physiol 2018; 8:631-709. [PMID: 29687901 PMCID: PMC6404781 DOI: 10.1002/cphy.c170023] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Sarcomeres consist of highly ordered arrays of thick myosin and thin actin filaments along with accessory proteins. Thick filaments occupy the center of sarcomeres where they partially overlap with thin filaments. The sliding of thick filaments past thin filaments is a highly regulated process that occurs in an ATP-dependent manner driving muscle contraction. In addition to myosin that makes up the backbone of the thick filament, four other proteins which are intimately bound to the thick filament, myosin binding protein-C, titin, myomesin, and obscurin play important structural and regulatory roles. Consistent with this, mutations in the respective genes have been associated with idiopathic and congenital forms of skeletal and cardiac myopathies. In this review, we aim to summarize our current knowledge on the molecular structure, subcellular localization, interacting partners, function, modulation via posttranslational modifications, and disease involvement of these five major proteins that comprise the thick filament of striated muscle cells. © 2018 American Physiological Society. Compr Physiol 8:631-709, 2018.
Collapse
Affiliation(s)
- Li Wang
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Janelle Geist
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Alyssa Grogan
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | - Li-Yen R. Hu
- Department of Biochemistry and Molecular Biology, University of Maryland, Baltimore, Maryland, USA
| | | |
Collapse
|
10
|
Tasca G, Udd B. Hereditary myopathy with early respiratory failure (HMERF): Still rare, but common enough. Neuromuscul Disord 2018; 28:268-276. [DOI: 10.1016/j.nmd.2017.12.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 11/04/2017] [Accepted: 12/03/2017] [Indexed: 01/04/2023]
|
11
|
Ferreiro A, Andoni Urtizberea J. [Titin-related muscle disorders: an expanding spectrum]. Med Sci (Paris) 2017; 33 Hors série n°1:16-26. [PMID: 29139381 DOI: 10.1051/medsci/201733s104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Titin-related diseases of the skeletal and cardiac muscles open a new, fruitful chapter of myology. Confined for a long time to a limited number of clinical entities, the phenotypic spectrum of titinopthies is nowadays expanding rapidly together with the discovery of many pathogenic mutations of the TTN gene. Like for many genes of large size, the fine tuning and use of high-throughput sequencing (NGS) constitutes a little revolution in the field. This powerful tool allows, although with real technical hurdles, the establishment of the definite diagnosis of titinopathy. A better knowledge of the natural history of each subtype of titinopathy enables as of now an optimized management of patients, notably when a cardiac or respiratory risk factor is identified. Research efforts in the titin-related conditions are gradually getting organized. Interactions between clinicians and geneticists are an absolute necessity. The still fragmentary knowledge of the pathogenesis of each titinopathy prevents to date to figure out any curative therapy in the very near future.
Collapse
Affiliation(s)
- Ana Ferreiro
- Pathophysiology of Striated Muscles laboratory, Unit of Functional and Adaptive Biology, BFA, University Paris Diderot/CNRS, Sorbonne Paris Cité, Paris, France - AP-HP, Centre de Référence Maladies Neuromusculaires Paris-Est, Groupe Hospitalier Pitié-Salpêtrière, 75013, Paris, France
| | - J Andoni Urtizberea
- Centre de compétence neuromusculaire Filnemus/Hôpital Marin, Hendaye, France
| |
Collapse
|
12
|
Park HJ, Lee JH, Kim SH, Hong JM, Shin HY, Kim SM, Lee JH, Park KD, Choi YC. Clinical and Pathological Findings of a Korean Family with Pathogenic Variants of the TTN Gene. J Clin Neurol 2016; 13:116-118. [PMID: 27868403 PMCID: PMC5242150 DOI: 10.3988/jcn.2017.13.1.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 08/14/2016] [Accepted: 08/16/2016] [Indexed: 11/17/2022] Open
Affiliation(s)
- Hyung Jun Park
- Department of Neurology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea
| | - Jung Hwan Lee
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Se Hoon Kim
- Department of Pathology, Yonsei University College of Medicine, Seoul, Korea
| | - Ji Man Hong
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Ha Young Shin
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Seung Min Kim
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Ji Hyun Lee
- Department of Clinical Pharmacology and Therapeutics, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Kee Duk Park
- Department of Neurology, Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea
| | - Young Chul Choi
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
| |
Collapse
|
13
|
|
14
|
Liu JS, Fan LL, Zhang H, Liu X, Huang H, Tao LJ, Xia K, Xiang R. Whole-Exome Sequencing Identifies Two Novel TTN Mutations in Chinese Families with Dilated Cardiomyopathy. Cardiology 2016; 136:10-14. [PMID: 27544385 DOI: 10.1159/000447422] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 06/03/2016] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Dilated cardiomyopathy (DCM) is a leading cause of sudden cardiac death. So far, only 127 mutations of Titin(TTN) have been reported in patients with different phenotypes such as isolated cardiomyopathies, purely skeletal muscle phenotypes or complex overlapping disorders of muscles. METHODS We applied whole-exome sequencing (WES) to investigate cardiomyopathy patients and a cardiomyopathy-related gene-filtering strategy was used to analyze the disease-causing mutations. Sanger sequencing was applied to confirm the mutation cosegregation in the affected families. RESULTS A nonsense mutation (c.12325C>T/p.R4109X) and a missense mutation (c.17755G>C/p.G5919R) of TTN were identified in 2 Chinese DCM families, respectively. Both mutations were cosegregated in all affected members of both families. The nonsense mutation is predicted to result in a truncated TTN protein and the missense mutation leads to a substitution of glycine by arginine. Both variants may cause the structure changes of titin protein. CONCLUSIONS We employed WES to detect the mutations of DCM patients and identified 2 novel mutations. Our study expands the spectrum of TTN mutations and offers accurate genetic testing information for DCM patients who are still clinically negative.
Collapse
Affiliation(s)
- Ji-Shi Liu
- The State Key Laboratory of Medical Genetics and School of Life Sciences, Central South University, Changsha, China
| | | | | | | | | | | | | | | |
Collapse
|