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Ebert SE, Meiling JB, Caress JB, Gandhi Mehta RK, Baute Penry V, Puwanant A, Cartwright MS. Clinical Utility and Diagnostic Yield of Genetic Testing for Inherited Neuromuscular Disorders in a Single, Large Neuromuscular Center. Neurol Clin Pract 2024; 14:e200268. [PMID: 38585444 PMCID: PMC10996901 DOI: 10.1212/cpj.0000000000200268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 01/05/2024] [Indexed: 04/09/2024]
Abstract
Background and Objectives Most published studies on the clinical utility of genetic testing for neuromuscular diseases (NMDs) focus on disease-specific cohorts and/or involve multiple centers. The aim of this study was to examine the clinical utility and diagnostic yield of genetic testing at a single, large neuromuscular center. Unlike previous studies, this study is unique in that it includes a broad array of patients at a single, large neuromuscular center, providing real-world data that may assist both neuromuscular specialists as well as general neurologists in decision-making regarding the need for genetic testing in patients with suspected NMDs. Methods Genetic testing results were reviewed for all patients who underwent testing through a single genetic testing company for NMDs in this single laboratory at a large neuromuscular center from 2015 to 2020. Retrospective chart reviews were performed to determine whether genetic testing results conferred a specific NMD diagnosis, including cases where a variant of uncertain significance (VUS) was identified. Results Genetic testing was pursued for 192 patients. A positive result, defined as a pathogenic mutation, a VUS, or both, was found in 77.1%. A definitive diagnosis was conferred in 35.9%. The most common testing indication was suspected neuropathy (53.3%), and the indication with the highest diagnostic yield was suspected myopathy (48.7%). Discussion This study provides further evidence of the clinical utility of genetic testing for NMDs in a real-world setting with over one-third of patients tested receiving a definitive diagnosis. Over time, genetic testing will continue to become increasingly accessible, cost-effective, and sensitive, which will lead to even more utilization.
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Affiliation(s)
- Suzahn E Ebert
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - James B Meiling
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - James B Caress
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - Rachana K Gandhi Mehta
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - Vanessa Baute Penry
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - Araya Puwanant
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
| | - Michael S Cartwright
- Department of Neurology (SEE), University of Virginia, Charlottesville; Department of Physical Medicine and Rehabilitation (JBM), Mayo Clinic, Rochester, MN; and Department of Neurology (JBC, RKGM, VBP, AP, MSC), Wake Forest School of Medicine, Winston-Salem, NC
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Lin F, Yang K, Lin X, Jin M, Chen L, Zheng FZ, Qiu LL, Ye ZX, Chen HZ, Lin MT, Wang N, Wang ZQ. Clinical features, imaging findings and molecular data of limb-girdle muscular dystrophies in a cohort of Chinese patients. Orphanet J Rare Dis 2023; 18:356. [PMID: 37974208 PMCID: PMC10652577 DOI: 10.1186/s13023-023-02897-x] [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: 01/07/2022] [Accepted: 08/31/2023] [Indexed: 11/19/2023] Open
Abstract
BACKGROUND Limb-girdle muscular dystrophies (LGMDs) are a group of heterogeneous inherited diseases predominantly characterized by limb-girdle muscle weakness and dystrophic changes on histological analysis. The frequency of LGMD subtypes varies among regions in China and ethnic populations worldwide. Here, we analyzed the prevalence of LGMD subtypes, their corresponding clinical manifestations, and molecular data in a cohort of LGMD patients in Southeast China. METHODS A total of 81 consecutive patients with clinically suspected LGMDs from 62 unrelated families across Southeast China were recruited for targeted next-generation sequencing and whole-exome sequencing from July 2017 to February 2020. RESULTS Among 50 patients (41 families) with LGMDs, the most common subtypes were LGMD-R2/LGMD2B (36.6%) and LGMD-R1/LGMD2A (29.3%). Dystroglycanopathies (including LGMD-R9/LGMD2I, LGMD-R11/LGMD2K, LGMD-R14/LGMD2N and LGMD-R20/LGMD2U) were the most common childhood-onset subtypes and were found in 12.2% of the families. A total of 14.6% of the families had the LGMD-R7/LGMD2G subtype, and the mutation c.26_33dupAGGTGTCG in TCAP was the most frequent (83.3%). The only patient with the rare subtype LGMD-R18/LGMD2S had TRAPPC11 mutations; had a later onset than those previously reported, and presented with proximal‒distal muscle weakness, walking aid dependency, fatty liver disease and diabetes at 33 years of age. A total of 22.0% of the patients had cardiac abnormalities, and one patient with LMNA-related muscular dystrophy/LGMD1B experienced sudden cardiac death at 37 years of age. A total of 15.4% of the patients had restrictive respiratory insufficiency. Muscle imaging in patients with LGMD-R1/LGMD2A and LGMD-R2/LGMD2B showed subtle differences, including more severe fatty infiltration of the posterior thigh muscles in those with LGMD-R1/LGMD2A and edema in the lower leg muscles in those with LGMD-R2/LGMD2B. CONCLUSION We determined the prevalence of different LGMD subtypes in Southeast China, described the detailed clinical manifestations and distinct muscle MRI patterns of these LGMD subtypes and reported the frequent mutations and the cardiorespiratory involvement frequency in our cohort, all of which might facilitate the differential diagnosis of LGMDs, allowing more timely treatment and guiding future clinical trials.
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Affiliation(s)
- Feng Lin
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
| | - Kang Yang
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
| | - Xin Lin
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
| | - Ming Jin
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China
| | - Long Chen
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
| | - Fu-Ze Zheng
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China
| | - Liang-Liang Qiu
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China
| | - Zhi-Xian Ye
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
| | - Hai-Zhu Chen
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China
| | - Min-Ting Lin
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China
| | - Ning Wang
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China.
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China.
| | - Zhi-Qiang Wang
- Department of Neurology and Institute of Neurology, The First Affiliated Hospital of Fujian Medical University, 20 Cha Zhong Road, Fuzhou, 350005, Fujian, China.
- Fujian Key Laboratory of Molecular Neurology, Fuzhou, 350005, China.
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Maruo Y, Saito Y, Nishino I, Takeda A. Successful treatment of frequent premature ventricular contractions and non-sustained ventricular tachycardia with verapamil and flecainide in RYR1-related myopathy: a case report. Eur Heart J Case Rep 2023; 7:ytad509. [PMID: 37881357 PMCID: PMC10597318 DOI: 10.1093/ehjcr/ytad509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 09/23/2023] [Accepted: 10/09/2023] [Indexed: 10/27/2023]
Abstract
Background Ryanodine receptor 1 (RYR1)-related myopathies are a group of congenital muscle diseases caused by RYR1 mutations. These mutations may cause centronuclear myopathy, a congenital neuromuscular disorder characterized by clinical muscle weakness and pathological presence of centrally placed nuclei on muscle biopsy. Mutations in RYR2 cause ventricular arrhythmias that can be treated with flecainide; however, reports of ventricular arrhythmias in RYR1-related myopathies are rare. Herein we report a case of centronuclear myopathy with RYR1 mutations who exhibited frequent premature ventricular contractions (PVCs) and non-sustained ventricular tachycardia (NSVT), which was successfully treated with verapamil and flecainide. Case summary At 7 months, the patient presented neurological manifestations of hypotonia and delayed motor development. A skeletal muscle biopsy performed at age 4 years led to the diagnosis of centronuclear myopathy. At age 15 years, frequent PVCs and NSVT were identified on the electrocardiogram and 24 h Holter monitoring. Treatment with verapamil was initiated; however, it was not beneficial. Therefore, flecainide was added to the treatment, decreasing the frequency of PVCs and NSVT. Non-sustained ventricular tachycardia disappeared at the age of 21, and PVCs almost disappeared at the age of 22. Genetic testing revealed c.13216delG (p.E4406Rfs*35), c.14874G>C (p.K4958N), and c.9892G>A (p.A3298T) in RYR1, and the compound heterozygosity of variants was confirmed by analysis of the parents. Discussion This is the first report of ventricular arrhythmia associated with RYR1-related myopathy that was successfully treated with verapamil and flecainide. The combination of verapamil and flecainide may be a useful treatment option for ventricular arrhythmias in patients with RYR1-related myopathies.
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Affiliation(s)
- Yuji Maruo
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
- Department of Pediatrics, Japanese Red Cross Kitami Hospital, North 6 East 2, Kitami 090-8666, Japan
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8502, Japan
- Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8502, Japan
- Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan
| | - Atsuhito Takeda
- Department of Pediatrics, Hokkaido University Graduate School of Medicine, North 15 West 7, Kita-ku, Sapporo 060-8638, Japan
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Tokuda N, Tsuji Y, Inoue M, Nishino I, Makino M. A Case of Cardiogenic Stroke With a Novel LMNA Variant (c. 1135C>A; p.Leu379Ile). Cureus 2023; 15:e37824. [PMID: 37213971 PMCID: PMC10197997 DOI: 10.7759/cureus.37824] [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] [Accepted: 04/19/2023] [Indexed: 05/23/2023] Open
Abstract
Laminopathy is muscular dystrophy caused by an LMNA gene mutation. It is characterized by cardiac disease such as atrial fibrillation. We report a case of laminopathy in a 49-year-old woman who presented with cardiogenic stroke. She had experienced weakness in her limb-girdle muscles since childhood, atrial fibrillation, cardiomyopathy, and mild contracture of the ankle joints, and had a familial history of heart disease. Gene analysis identified a novel heterozygous variant, c. 1135C>A (p.Leu379Ile), in the LMNA gene. Laminopathy can be an underlying disease in ischemic stroke, especially in young to middle age.
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Affiliation(s)
- Naoki Tokuda
- Department of Neurology, Kyoto Okamoto Memorial Hospital, Kyoto, JPN
- Department of Neurology, Japanese Red Cross Kyoto Daini Hospital, Kyoto, JPN
| | - Yukiko Tsuji
- Department of Neurology, Kyoto Okamoto Memorial Hospital, Kyoto, JPN
| | - Michio Inoue
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, JPN
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, JPN
| | - Masahiro Makino
- Department of Neurology, Kyoto Okamoto Memorial Hospital, Kyoto, JPN
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Tanboon J, Inoue M, Hirakawa S, Tachimori H, Hayashi S, Noguchi S, Okiyama N, Fujimoto M, Suzuki S, Nishino I. Muscle pathology of antisynthetase syndrome according to antibody subtypes. Brain Pathol 2023:e13155. [PMID: 36882048 DOI: 10.1111/bpa.13155] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 02/15/2023] [Indexed: 03/09/2023] Open
Abstract
Identification of antisynthetase syndrome (ASS) could be challenging due to inaccessibility and technical difficulty of the serology test for the less common non-Jo-1 antibodies. This study aimed to describe ASS antibody-specific myopathology and evaluate the diagnostic utility of myofiber HLA-DR expression. We reviewed 212 ASS muscle biopsies and compared myopathologic features among subtypes. Additionally, we compared their HLA-DR staining pattern with 602 non-ASS myositis and 140 genetically confirmed myopathies known to have an inflammatory component. We used t-test and Fisher's exact for comparisons and used sensitivity, specificity, positive and negative predictive values to assess the utility of HLA-DR expression for ASS diagnosis. RNAseq performed from a subset of myositis cases and histologically normal muscle biopsies was used to evaluate interferon (IFN)-signaling pathway-related genes. Anti-OJ ASS showed prominent myopathology with higher scores in muscle fiber (4.6 ± 2.0 vs. 2.8 ± 1.8, p = 0.001) and inflammatory domains (6.8 ± 3.2 vs. 4.5 ± 2.9, p = 0.006) than non-OJ ASS. HLA-DR expression and IFN-γ-related genes upregulation were prominent in ASS and inclusion body myositis (IBM). When dermatomyositis and IBM were excluded, HLA-DR expression was 95.4% specific and 61.2% sensitive for ASS with a positive predictive value of 85.9% and a negative predictive value of 84.2%; perifascicular HLA-DR pattern is common in anti-Jo-1 ASS than non-Jo-1 ASS (63.1% vs. 5.1%, p < 0.0001). In the appropriate clinicopathological context, myofiber HLA-DR expression help support ASS diagnosis. The presence of HLA-DR expression suggests involvement of IFN-γ in the pathogenesis of ASS, though the detailed mechanisms have yet to be elucidated.
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Affiliation(s)
- Jantima Tanboon
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Michio Inoue
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Shinya Hirakawa
- Department of Clinical Data Science, Clinical Research & Education Promotion Division, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Hisateru Tachimori
- Department of Clinical Data Science, Clinical Research & Education Promotion Division, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Shinichiro Hayashi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Naoko Okiyama
- Department of Dermatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Manabu Fujimoto
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Dermatology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Shigeaki Suzuki
- Department of Neurology, Keio University School of Medicine, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
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Yoshioka N, Kurose M, Yano M, Tran DM, Okuda S, Mori-Ochiai Y, Horie M, Nagai T, Nishino I, Shibata S, Takebayashi H. Isoform-specific mutation in Dystonin-b gene causes late-onset protein aggregate myopathy and cardiomyopathy. eLife 2022; 11:78419. [PMID: 35942699 PMCID: PMC9365387 DOI: 10.7554/elife.78419] [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: 03/07/2022] [Accepted: 07/18/2022] [Indexed: 12/03/2022] Open
Abstract
Dystonin (DST), which encodes cytoskeletal linker proteins, expresses three tissue-selective isoforms: neural DST-a, muscular DST-b, and epithelial DST-e. DST mutations cause different disorders, including hereditary sensory and autonomic neuropathy 6 (HSAN-VI) and epidermolysis bullosa simplex; however, etiology of the muscle phenotype in DST-related diseases has been unclear. Because DST-b contains all of the DST-a-encoding exons, known HSAN-VI mutations could affect both DST-a and DST-b isoforms. To investigate the specific function of DST-b in striated muscles, we generated a Dst-b-specific mutant mouse model harboring a nonsense mutation. Dst-b mutant mice exhibited late-onset protein aggregate myopathy and cardiomyopathy without neuropathy. We observed desmin aggregation, focal myofibrillar dissolution, and mitochondrial accumulation in striated muscles, which are common characteristics of myofibrillar myopathy. We also found nuclear inclusions containing p62, ubiquitin, and SUMO proteins with nuclear envelope invaginations as a unique pathological hallmark in Dst-b mutation-induced cardiomyopathy. RNA-sequencing analysis revealed changes in expression of genes responsible for cardiovascular functions. In silico analysis identified DST-b alleles with nonsense mutations in populations worldwide, suggesting that some unidentified hereditary myopathy and cardiomyopathy are caused by DST-b mutations. Here, we demonstrate that the Dst-b isoform is essential for long-term maintenance of striated muscles.
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Affiliation(s)
- Nozomu Yoshioka
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Transdisciplinary Research Programs, Niigata University, Niigata, Japan
| | - Masayuki Kurose
- Department of Physiology, School of Dentistry, Iwate Medical University, Iwate, Japan
| | - Masato Yano
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Dang Minh Tran
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Shujiro Okuda
- Medical AI Center, School of Medicine, Niigata University, Niigata, Japan
| | - Yukiko Mori-Ochiai
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Masao Horie
- Department of Nursing, Niigata College of Nursing, Jōetsu, Japan
| | - Toshihiro Nagai
- Electron Microscope Laboratory, Keio University, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Shinsuke Shibata
- Electron Microscope Laboratory, Keio University, Tokyo, Japan.,Division of Microscopic Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | - Hirohide Takebayashi
- Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.,Center for Coordination of Research Facilities, Niigata University, Niigata, Japan
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Lee S, Kim SY, Lim BC, Kim KJ, Chae JH, Cho A. Expanding the Clinical and Genetic Spectrum of Caveolinopathy in Korea. ANNALS OF CHILD NEUROLOGY 2022. [DOI: 10.26815/acn.2022.00136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Purpose: Caveolinopathy is a disease caused by caveolin-3 (CAV3) mutations that shows a wide clinical spectrum, including isolated hyperCKemia and limb-girdle muscular dystrophy. While recent advances in next-generation sequencing (NGS) have enabled earlier diagnosis of this disease, it remains difficult to predict the clinical course of each patient.Methods: This study summarizes the clinical presentations of 13 genetically confirmed caveolinopathy patients in four Korean families. Genetic diagnosis was performed using NGS technologies for probands and Sanger sequencing for the other family members.Results: Four coding mutations were found (p.Val103_Val104del, p.Asp28Glu, p.Pro105Leu, and p.Arg27Gln), and each family showed autosomal dominant inheritance. While all 13 cases had hyperCKemia, only five of them showed some myopathic features including ankle contracture, calf hypertrophy, exercise intolerance, and muscle cramping. This high proportion of asymptomatic cases suggests both that these mutations may be associated with a mild phenotype and that caveolinopathy may be an underdiagnosed disease.Conclusion: This study extends our understanding of caveolinopathy; in particular, the findings suggest the need to consider caveolinopathy in patients with incidental findings of CK elevation. NGS may be a useful method in the differential diagnosis of such cases.
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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.
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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
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A 78-year-old Japanese male with late-onset PHKA1-associated distal myopathy: Case report and literature review. Neuromuscul Disord 2022; 32:769-773. [DOI: 10.1016/j.nmd.2022.05.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 05/13/2022] [Accepted: 05/16/2022] [Indexed: 11/20/2022]
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10
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Munekane A, Ohsawa Y, Fukuda T, Nishimura H, Nishimatsu SI, Sugie H, Saito Y, Nishino I, Sunada Y. Maximal Multistage Shuttle Run Test-induced Myalgia in a Patient with Muscle Phosphorylase B Kinase Deficiency. Intern Med 2022; 61:1241-1245. [PMID: 34615823 PMCID: PMC9107984 DOI: 10.2169/internalmedicine.8137-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Accepted: 08/17/2021] [Indexed: 11/14/2022] Open
Abstract
Muscle phosphorylase b kinase (PHK) deficiency is a rare mild metabolic disorder caused by mutations of the PHKA1 gene encoding the αM subunit of PHK. A 16-year-old boy experienced myalgia during the maximal multistage 20-m shuttle run test targeting the maximal oxygen consumption. Although an ischemic forearm exercise test was normal, a muscle biopsy revealed subsarcolemmal glycogen accumulation. He harbored a novel insertion mutation in the PHKA1 gene that resulted in premature termination of the αM subunit close to the C-terminus. Compared with previously reported cases, his reduction in PHK activity was relatively mild.
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Affiliation(s)
| | - Yutaka Ohsawa
- Department of Neurology, Kawasaki Medical School, Japan
| | - Tokiko Fukuda
- Department of Pediatrics, Hamamatsu University School of Medicine, Japan
| | | | | | - Hideo Sugie
- Faculty of Health and Medical Science, Tokoha University, Japan
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience (NCNP), Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience (NCNP), Japan
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11
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Fujii K, Hirano M, Terayama A, Inada R, Saito Y, Nishino I, Nagai Y. Identification of a novel mutation and genotype–phenotype relationship in MEGF10 myopathy. Neuromuscul Disord 2022; 32:436-440. [DOI: 10.1016/j.nmd.2022.01.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 01/17/2022] [Accepted: 01/21/2022] [Indexed: 10/19/2022]
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12
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Fujise K, Okubo M, Abe T, Yamada H, Takei K, Nishino I, Takeda T, Noguchi S. Imaging-based evaluation of pathogenicity by novel DNM2 variants associated with centronuclear myopathy. Hum Mutat 2021; 43:169-179. [PMID: 34837441 DOI: 10.1002/humu.24307] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 11/04/2021] [Accepted: 11/06/2021] [Indexed: 11/11/2022]
Abstract
A centronuclear myopathy (CNM) is a group of inherited congenital diseases showing clinically progressive muscle weakness associated with the presence of centralized myonuclei, diagnosed by genetic testing and muscle biopsy. The gene encoding dynamin 2, DNM2, has been identified as a causative gene for an autosomal dominant form of CNM. However, the information of a DNM2 variant alone is not always sufficient to gain a definitive diagnosis as the pathogenicity of many gene variants is currently unknown. In this study, we identified five novel DNM2 variants in our cohort. To establish the pathogenicity of these variants without using clinicopathological information, we used a simple in cellulo imaging-based assay for T-tubule-like structures to provide quantitative data that enable objective determination of pathogenicity by novel DNM2 variants. With this assay, we demonstrated that the phenotypes induced by mutant dynamin 2 in cellulo are well correlated with biochemical gain-of-function features of mutant dynamin 2 as well as the clinicopathological phenotypes of each patient. Our approach of combining an in cellulo assay with clinical information of the patients also explains the course of a disease progression by the pathogenesis of each variant in DNM2-associated CNM.
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Affiliation(s)
- Kenshiro Fujise
- Department of Biochemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Pediatrics, The University of Tokyo, Tokyo, Japan
| | - Tadashi Abe
- Department of Biochemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Hiroshi Yamada
- Department of Biochemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Kohji Takei
- Department of Biochemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Tetsuya Takeda
- Department of Biochemistry, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
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13
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Awano H, Saito Y, Shimizu M, Sekiguchi K, Niijima S, Matsuo M, Maegaki Y, Izumi I, Kikuchi C, Ishibashi M, Okazaki T, Komaki H, Iijima K, Nishino I. FKRP mutations cause congenital muscular dystrophy 1C and limb-girdle muscular dystrophy 2I in Asian patients. J Clin Neurosci 2021; 92:215-221. [PMID: 34509255 DOI: 10.1016/j.jocn.2021.08.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 06/18/2021] [Accepted: 08/15/2021] [Indexed: 11/19/2022]
Abstract
Mutation in the fukutin-related protein (FKRP) gene causes alpha-dystroglycanopathies, a group of autosomal recessive disorders associated with defective glycosylated alpha-dystroglycan (α-DG). The disease phenotype shows a broad spectrum, from the most severe congenital form involving brain and eye anomalies to milder limb-girdle form. FKRP-related alpha-dystroglycanopathies are common in European countries. However, a limited number of patients have been reported in Asian countries. Here, we presented the clinical, pathological, and genetic findings of nine patients with FKRP mutations identified at a single muscle repository center in Japan. Three and six patients were diagnosed with congenital muscular dystrophy type 1C and limb-girdle muscular dystrophy 2I, respectively. None of our Asian patients showed the most severe form of alpha-dystroglycanopathy. While all patients showed a reduction in glycosylated α-DG levels, to variable degrees, these levels did not correlate to clinical severity. Fifteen distinct pathogenic mutations were identified in our cohort, including five novel mutations. Unlike in the populations belonging to European countries, no common mutation was found in our cohort.
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Affiliation(s)
- Hiroyuki Awano
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan.
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
| | - Mamiko Shimizu
- Shimizu Children's Clinic, 3-152 Komaki, Komaki, Aichi 485-0041, Japan
| | - Kenji Sekiguchi
- Division of Neurology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan
| | - Shinichi Niijima
- Department of Pediatrics, Juntendo University, Nerima Hospital, 3-1-10 Takanodai, Nerima, Tokyo 177-8521, Japan
| | - Masafumi Matsuo
- Research Center for Locomotion Biology, Kobe Gakuin Univesity, 518 Arise, Ikawadani-cho, Nishi, Kobe, Hyogo 651-2180, Japan
| | - Yoshihiro Maegaki
- Division of Child Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, 86 Nishi-cho, Yonago, Tottori 683-8504, Japan
| | - Isho Izumi
- Ibaraki Children's Hospital, 3-3-1 Futabadai, Mito, Ibaraki 311-4145, Japan
| | - Chiya Kikuchi
- Department of Pediatrics, National Hospital Organization Ehime Medical Center, 366 Yokogawara, Toon, Ehime 791-0281, Japan
| | - Masato Ishibashi
- Department of Neurology, Faculty of Medicine, Oita University, 1-1 Hasamamachi-idaigaoka, Yufu, Oita 879-5593, Japan
| | - Tetsuya Okazaki
- Department of Clinical Genetics, Tottori University Hospital, 36-1 Nishi-cho, Yonago, Tottori 683-8504, Japan
| | - Hirofumi Komaki
- Translational Medical Center, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
| | - Kazumoto Iijima
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
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14
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Inoue M, Saito Y, Yonekawa T, Ogawa M, Iida A, Nishino I, Noguchi S. Causative variant profile of collagen VI-related dystrophy in Japan. Orphanet J Rare Dis 2021; 16:284. [PMID: 34167565 PMCID: PMC8223365 DOI: 10.1186/s13023-021-01921-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Accepted: 06/13/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Collagen VI-related dystrophy spans a clinical continuum from severe Ullrich congenital muscular dystrophy to milder Bethlem myopathy. This disease is caused by causative variants in COL6A1, COL6A2, or COL6A3. Most reported causative variants are de novo; therefore, to identify possible associated causative variants, comprehensive large cohort studies are required for different ethnicities. METHODS We retrospectively reviewed clinical information, muscle histology, and genetic analyses from 147 Japanese patients representing 130 families, whose samples were sent for diagnosis to the National Center of Neurology and Psychiatry between July 1979 and January 2020. Genetic analyses were conducted by gene-based resequencing, targeted panel resequencing, and whole exome sequencing, in combination with cDNA analysis. RESULTS Of a total of 130 families with 1-5 members with collagen VI-related dystrophy, 120 had mono-allelic and 10 had bi-allelic variants in COL6A1, COL6A2, or COL6A3. Among them, 60 variants were in COL6A1, 57 in COL6A2, and 23 in COL6A3, including 37 novel variants. Mono-allelic variants were classified into four groups: missense (69, 58%), splicing (40, 33%), small in-frame deletion (7, 6%), and large genomic deletion (4, 3%). Variants in the triple helical domains accounted for 88% (105/120) of all mono-allelic variants. CONCLUSIONS We report the causative variant profile of a large set of Japanese cases of collagen VI-related dystrophy. This dataset can be used as a reference to support genetic diagnosis and variant-specific treatment.
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Affiliation(s)
- Michio Inoue
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Tokyo, Japan
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Tokyo, Japan
| | - Takahiro Yonekawa
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan
| | - Megumu Ogawa
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan
| | - Aritoshi Iida
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan.,Department of Clinical Genome Analysis, Medical Genome Center, NCNP, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Tokyo, Japan.,Department of Clinical Genome Analysis, Medical Genome Center, NCNP, Tokyo, Japan
| | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8502, Japan.
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15
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Lee T, Tokunaga S, Taniguchi N, Misaki M, Shimomura H, Nishino I, Itoh K, Takeshima Y. Underlying diseases in sporadic presentation of high creatine kinase levels in girls. Clin Chim Acta 2021; 519:198-203. [PMID: 33965408 DOI: 10.1016/j.cca.2021.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/02/2021] [Accepted: 05/04/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Persistent creatine kinase (CK) elevation can occur due to various conditions. Identifying the causes of hyperCKemia is crucial for enabling appropriate follow-up and care. Girls with elevated CK levels may be carriers of Duchenne/Becker muscular dystrophy (DMD/BMD), making diagnosis more difficult than that in boys. This study aimed to elucidate the underlying causes of high CK levels in girls. METHODS Fourteen girls (seven symptomatic, seven asymptomatic) with persistently elevated CK levels but without a family history of muscle diseases were referred to our hospital between April 2014 and August 2018. Muscle biopsy and/or genetic analysis were conducted for diagnoses. RESULTS Among the symptomatic girls, six (85.7%) had muscular dystrophy (five DMD/BMD carriers, and one sarcoglycanopathy [limb-girdle muscular dystrophy: LGMDR4]), and one had dermatomyositis. Among the asymptomatic girls, four (57.1%) had muscular dystrophy (three DMD/BMD carriers, and one calpainopathy [LGMDR1]), and three were undiagnosed. CONCLUSION Our results indicate that muscular dystrophy, including DMD/BMD carriers, must be considered in girls with highperCKemia regardless of symptoms presentation, and in symptomatic girls with dermatomyositis. Investigations in girls with hyperCKemia should be performed under proper ethical considerations. Further research is necessary to develop a diagnostic strategy for girls with hyperCKemia.
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Affiliation(s)
- Tomoko Lee
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan.
| | - Sachi Tokunaga
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Naoko Taniguchi
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Maiko Misaki
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Hideki Shimomura
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Kyoko Itoh
- Department of Pathology and Applied Neurobiology, Kyoto Prefectural University of Medicine Graduate School of Medical Science, Kyoto, Japan
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16
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Sun H, Shen XR, Fang ZB, Jiang ZZ, Wei XJ, Wang ZY, Yu XF. Next-Generation Sequencing Technologies and Neurogenetic Diseases. Life (Basel) 2021; 11:life11040361. [PMID: 33921670 PMCID: PMC8072598 DOI: 10.3390/life11040361] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 04/05/2021] [Accepted: 04/16/2021] [Indexed: 12/18/2022] Open
Abstract
Next-generation sequencing (NGS) technology has led to great advances in understanding the causes of Mendelian and complex neurological diseases. Owing to the complexity of genetic diseases, the genetic factors contributing to many rare and common neurological diseases remain poorly understood. Selecting the correct genetic test based on cost-effectiveness, coverage area, and sequencing range can improve diagnosis, treatments, and prevention. Whole-exome sequencing and whole-genome sequencing are suitable methods for finding new mutations, and gene panels are suitable for exploring the roles of specific genes in neurogenetic diseases. Here, we provide an overview of the classifications, applications, advantages, and limitations of NGS in research on neurological diseases. We further provide examples of NGS-based explorations and insights of the genetic causes of neurogenetic diseases, including Charcot-Marie-Tooth disease, spinocerebellar ataxias, epilepsy, and multiple sclerosis. In addition, we focus on issues related to NGS-based analyses, including interpretations of variants of uncertain significance, de novo mutations, congenital genetic diseases with complex phenotypes, and single-molecule real-time approaches.
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Affiliation(s)
| | | | | | | | | | | | - Xue-Fan Yu
- Correspondence: ; Tel.: +86-157-5430-1836
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17
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Ogasawara M, Ogawa M, Nonaka I, Hayashi S, Noguchi S, Nishino I. Evaluation of the Core Formation Process in Congenital Neuromuscular Disease With Uniform Type 1 Fiber and Central Core Disease. J Neuropathol Exp Neurol 2021; 79:1370-1375. [PMID: 33184643 DOI: 10.1093/jnen/nlaa104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Typical central core disease (CCD) is characterized pathologically by the presence of a core and is accompanied by type 1 fiber uniformity. Congenital neuromuscular disease with uniform type 1 fiber (CNMDU1) is characterized pathologically by the presence of type 1 fiber uniformity but without the abnormal structural changes in muscle fibers. Interestingly, typical CCD and 40% of CNMDU1 cases are caused by the same mutations in RYR1, and thus CNMDU1 has been considered an early precursor to CCD. To better understand the nature of CNMDU1, we re-evaluated muscle biopsies from 16 patients with CNMDU1 using immunohistochemistry to RYR1, triadin and TOM20, and compared this to muscle biopsies from 36 typical CCD patients. In CCD, RYR1, and triadin were present in the core regions, while TOM20 was absent in the core regions. Interestingly, in 5 CNMDU1 cases with the RYR1 mutation, RYR1, and triadin were similarly present in core-like areas, while TOM20 was absent in the subsarcolemmal region. Furthermore, there was a correlation between the core position and the disease duration or progression-the older patients in more advanced stages had more centralized cores. Our results indicate that CNMDU1 due to RYR1 mutation is a de facto core myopathy.
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Affiliation(s)
- Masashi Ogasawara
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Kodaira, Japan.,Institute of Medical Genetics, Tokyo Women's Medical University, Tokyo, Japan
| | - Megumu Ogawa
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan
| | - Ikuya Nonaka
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Kodaira, Japan
| | - Shinichiro Hayashi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Kodaira, Japan
| | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Kodaira, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, NCNP, Kodaira, Japan
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18
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Williams ZJ, Velez-Irizarry D, Petersen JL, Ochala J, Finno CJ, Valberg SJ. Candidate gene expression and coding sequence variants in Warmblood horses with myofibrillar myopathy. Equine Vet J 2021; 53:306-315. [PMID: 32453872 PMCID: PMC7864122 DOI: 10.1111/evj.13286] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/18/2020] [Accepted: 05/02/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND Myofibrillar myopathy (MFM) of unknown aetiology has recently been identified in Warmblood (WB) horses. In humans, 16 genes have been implicated in various MFM-like disorders. OBJECTIVES To identify variants in 16 MFM candidate genes and compare allele frequencies of all variants between MFM WB and non-MFM WB and coding variants with moderate or severe predicted effects in MFM WB with publicly available data of other breeds. To compare differential gene expression and muscle fibre contractile force between MFM and non-MFM WB. STUDY DESIGN Case-control. ANIMALS 8 MFM WB, 8 non-MFM WB, 33 other WB, 32 Thoroughbreds, 80 Quarter Horses and 77 horses of other breeds in public databases. METHODS Variants were called within transcripts of 16 candidate genes using gluteal muscle mRNA sequences aligned to EquCab3.0 and allele frequencies compared by Fisher's exact test among MFM WB, non-MFM WB and public sequences across breeds. Candidate gene differential expression was determined between MFM and non-MFM WB by fitting a negative binomial generalised log-linear model per gene (false discovery rate <0.05). The maximal isometric force/cross-sectional area generated by isolated membrane-permeabilised muscle fibres was determined. RESULTS None of the 426 variants identified in 16 candidate genes were associated with MFM including 26 missense variants. Breed-specific differences existed in allele frequencies. Candidate gene differential expression and muscle fibre-specific force did not differ between MFM WB (143.1 ± 34.7 kPa) and non-MFM WB (140.2 ± 43.7 kPa) (P = .8). MAIN LIMITATIONS RNA-seq-only assays transcripts expressed in skeletal muscle. Other possible candidate genes were not evaluated. CONCLUSIONS Evidence for association of variants with a disease is essential because coding sequence variants are common in the equine genome. Variants identified in MFM candidate genes, including two coding variants offered as commercial MFM equine genetic tests, did not associate with the WB MFM phenotype.
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Affiliation(s)
- Zoë J. Williams
- Large Animal Clinical Sciences, Michigan State University, College of Veterinary Medicine, East Lansing, MI, USA
| | - Deborah Velez-Irizarry
- Large Animal Clinical Sciences, Michigan State University, College of Veterinary Medicine, East Lansing, MI, USA
| | - Jessica L. Petersen
- Department of Animal Science, University of Nebraska Lincoln, Lincoln, NE, USA
| | - Julien Ochala
- Faculty of Life Sciences and Medicine, King’s College London, London, UK
| | - Carrie J. Finno
- University of California at Davis, School of Veterinary Medicine, Davis, CA, USA
| | - Stephanie J. Valberg
- Large Animal Clinical Sciences, Michigan State University, College of Veterinary Medicine, East Lansing, MI, USA
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19
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Novel compound heterozygous variants in the GFPT1 gene leading to rare limb-girdle congenital myasthenic syndrome with rimmed vacuoles. Neurol Sci 2021; 42:3485-3490. [PMID: 33438142 DOI: 10.1007/s10072-020-05021-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 12/21/2020] [Indexed: 02/08/2023]
Abstract
BACKGROUND Congenital myasthenic syndrome (CMS) is a heterogeneous group of rare disorders with impaired neuromuscular transmission caused by genetic defects, which is characterized by fatigable muscle weakness. CASE PRESENTATION Herein, we report a case of limb-girdle CMS (LG-CMS) in a 15-year-old Chinese girl with limb weakness and mild ptosis. The patient presented with well-defined clinical manifestations, muscle imaging, and electrophysiological features associated with CMS. On muscle biopsy, in addition to tubular aggregates identified, an extremely unusual pathological change of rimmed vacuoles in muscle fibers was observed. Whole-exome sequencing disclosed two novel heterozygous variants (c.14 T>A and c.581 T>C) in the human glutamine-fructose-6-phosphate transaminase 1 (GFPT1) gene, leading to the substitutions of phenylalanine to tyrosine (p.F5Y) and serine (p.F194S), respectively. Both variants were predicted to be likely pathogenic by SIFT, Polyphen-2, and Mutation Taster. Treatments with pyridostigmine bromide and albuterol produced a dramatic improvement. CONCLUSIONS Collectively, molecular genetic analysis and muscle biopsy play crucial roles in the diagnosis of GFPT1-related LG-CMS with rimmed vacuoles (a rare phenotype of CMS) and have important implications for treatment decision.
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20
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Savarese M, Johari M, Johnson K, Arumilli M, Torella A, Töpf A, Rubegni A, Kuhn M, Giugliano T, Gläser D, Fattori F, Thompson R, Penttilä S, Lehtinen S, Gibertini S, Ruggieri A, Mora M, Maver A, Peterlin B, Mankodi A, Lochmüller H, Santorelli FM, Schoser B, Fajkusová L, Straub V, Nigro V, Hackman P, Udd B. Improved Criteria for the Classification of Titin Variants in Inherited Skeletal Myopathies. J Neuromuscul Dis 2020; 7:153-166. [PMID: 32039858 DOI: 10.3233/jnd-190423] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Extensive genetic screening results in the identification of thousands of rare variants that are difficult to interpret. Because of its sheer size, rare variants in the titin gene (TTN) are detected frequently in any individual. Unambiguous interpretation of molecular findings is almost impossible in many patients with myopathies or cardiomyopathies. OBJECTIVE To refine the current classification framework for TTN-associated skeletal muscle disorders and standardize the interpretation of TTN variants. METHODS We used the guidelines issued by the American College of Medical Genetics and Genomics (ACMG) and the Association for Molecular Pathology (AMP) to re-analyze TTN genetic findings from our patient cohort. RESULTS We identified in the classification guidelines three rules that are not applicable to titin-related skeletal muscle disorders; six rules that require disease-/gene-specific adjustments and four rules requiring quantitative thresholds for a proper use. In three cases, the rule strength need to be modified. CONCLUSIONS We suggest adjustments are made to the guidelines. We provide frequency thresholds to facilitate filtering of candidate causative variants and guidance for the use and interpretation of functional data and co-segregation evidence. We expect that the variant classification framework for TTN-related skeletal muscle disorders will be further improved along with a better understanding of these diseases.
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Affiliation(s)
- Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland.,Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Mridul Johari
- Folkhälsan Research Center, Helsinki, Finland.,Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Katherine Johnson
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Meharji Arumilli
- Folkhälsan Research Center, Helsinki, Finland.,Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Annalaura Torella
- Dipartimento di Medicina di Precisione, Universitá degli Studi della Campania "Luigi Vanvitelli", Naples, Italy.,Telethon Institute of Genetics and Medicine, Pozzuoli, Italy
| | - Ana Töpf
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | | | | | - Teresa Giugliano
- Dipartimento di Medicina di Precisione, Universitá degli Studi della Campania "Luigi Vanvitelli", Naples, Italy.,Telethon Institute of Genetics and Medicine, Pozzuoli, Italy
| | | | - Fabiana Fattori
- Unit for Neuromuscular and Neurodegenerative Disorders, Bambino Gesù Children's Hospital, Rome, Italy
| | - Rachel Thompson
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Sini Penttilä
- Neuromuscular Research Center, Department of Genetics, Fimlab Laboratories, Tampere, Finland
| | - Sara Lehtinen
- Neuromuscular Research Center, Department of Genetics, Fimlab Laboratories, Tampere, Finland
| | - Sara Gibertini
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy
| | - Alessandra Ruggieri
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy.,Department of Molecular and Translation Medicine, Unit of Biology and Genetics, University of Brescia, Brescia, Italy
| | - Marina Mora
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy
| | - Ales Maver
- Clinical Institute of Medical Genetics, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Borut Peterlin
- Clinical Institute of Medical Genetics, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Ami Mankodi
- Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, Unites States
| | - Hanns Lochmüller
- Department of Neuropediatrics and Muscle Disorders, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany.,Centro Nacional de Análisis Genómico (CNAG-CRG), Center for Genomic Regulation, Barcelona Institute of Science and Technology (BIST), Barcelona, Spain.,Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada.,Division of Neurology, Department of Medicine, The Ottawa Hospital, Ottawa, Canada
| | | | - Benedikt Schoser
- Friedrich-Baur-Institut, Neurologische Klinik Ludwig-Maximilians-Universität München, Munich, Germany
| | - Lenka Fajkusová
- Centre of Molecular Biology and Gene Therapy, University Hospital Brno and Masaryk University Brno, Brno, Czech Republic
| | - Volker Straub
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Vincenzo Nigro
- Dipartimento di Medicina di Precisione, Universitá degli Studi della Campania "Luigi Vanvitelli", Naples, Italy.,Telethon Institute of Genetics and Medicine, Pozzuoli, Italy
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland.,Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Helsinki, Finland.,Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland.,Department of Neurology, Vaasa Central Hospital, Vaasa, Finland.,Neuromuscular Research Center, Tampere University and University Hospital, Tampere, Finland
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21
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Ohara M, Saito Y, Watanabe M, Mizutani S, Kobayashi M, Iida A, Nishino I, Fujigasaki H. An adult nemaline myopathy patient with respiratory and heart failure harboring a novel NEB variant. eNeurologicalSci 2020; 21:100268. [PMID: 32939402 PMCID: PMC7479285 DOI: 10.1016/j.ensci.2020.100268] [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: 05/14/2020] [Revised: 08/12/2020] [Accepted: 08/25/2020] [Indexed: 11/29/2022] Open
Abstract
Nemaline myopathy is a heterogeneous disorder of skeletal muscle, and histologically characterized by the presence of nemaline bodies in muscle fibers. Patients with typical congenital form of nemaline myopathy initially present with proximal but later also distal muscle weakness, mostly involving facial and respiratory muscle. Cardiac involvement has been rarely observed especially in nebulin-related nemaline myopathy and there have been only two reports about nebulin-related nemaline myopathy patients with cardiac involvement. We present here the case of a 65-year-old woman manifesting slowly progressive distal myopathy with respiratory and heart failure. She harbored two variants in the nebulin gene, c.20131C > T (p.Arg6711Trp) and c.674C > T (p.Pro225Leu), and one of them, c.674C > T, was a novel variant. In this report, we discuss the pathogenicity of the novel variant and its association with clinical phenotypes including cardiac involvement. A NEB-related nemaline myopathy patient developed distal myopathy, respiratory and heart failure. Two variants in NEB were noted and one of them was a novel variant. The novel variant might be associated with the clinical symptoms including heart failure.
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Affiliation(s)
- Masahiro Ohara
- Department of Internal Medicine, Tokyo, Metropolitan Bokutoh Hospital, Japan.,Department of Neurology and Neurological Science, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8502, Japan
| | - Mutsufusa Watanabe
- Department of Internal Medicine, Tokyo, Metropolitan Bokutoh Hospital, Japan
| | - Saneyuki Mizutani
- Department of Internal Medicine, Tokyo, Metropolitan Bokutoh Hospital, Japan
| | - Masaki Kobayashi
- Department of Neurology, Nissan Tamagawa Hospital, 4-8-1 Seta, Setagaya-ku, Tokyo 158-0095, Japan
| | - Aritoshi Iida
- Medical Genome Center, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8502, Japan.,Medical Genome Center, National Center of Neurology and Psychiatry, 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo 187-8551, Japan
| | - Hiroto Fujigasaki
- Department of Internal Medicine, Tokyo, Metropolitan Bokutoh Hospital, Japan
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22
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Saito Y, Nishikawa A, Iida A, Mori-Yoshimura M, Oya Y, Ishiyama A, Komaki H, Nakamura S, Fujikawa S, Kanda T, Yamadera M, Sakiyama H, Hayashi S, Nonaka I, Noguchi S, Nishino I. ADSSL1 myopathy is the most common nemaline myopathy in Japan with variable clinical features. Neurology 2020; 95:e1500-e1511. [DOI: 10.1212/wnl.0000000000010237] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 03/17/2020] [Indexed: 11/15/2022] Open
Abstract
ObjectiveTo elucidate the prevalence of Japanese ADSSL1 myopathy and determine the clinicopathologic features of the disease.MethodsWe searched forADSSL1variants in myopathic patients from January 1978 to March 2019 in our repository and assessed the clinicopathologic features of patients with variants.ResultsWe identified 63 patients from 59 families with biallelic variants ofADSSL1. Among the 7 distinct variants identified, c.781G>A and c.919delA accounted for 53.2% and 40.5% of alleles, respectively, suggesting the presence of common founders, while the other 5 were novel. Most of the identified patients displayed more variable muscle symptoms, including symptoms in the proximal and/or distal leg muscles, tongue, masseter, diaphragm, and paraspinal muscles, in adolescence than previously reported patients. Dysphagia with masticatory dysfunction developed in 26 out of 63 patients; hypertrophic cardiomyopathy developed in 12 out of 48 patients; and restrictive ventilatory insufficiency developed in 26 out of 34 patients in later stages. Radiologically, fat infiltration into the periphery of vastus lateralis, gastrocnemius, and soleus muscles was observed in all patients. Pathologically, nemaline bodies in addition to increased lipid droplets and myofibrillar disorganization were commonly observed in all patients, suggesting that the disease may be classified as nemaline myopathy. This finding revealed thatADSSL1myopathy is the most frequent among all genetically diagnosable nemaline myopathies in our center.ConclusionsADSSL1 myopathy is characterized by more variable manifestations than previously reported. It is the most common among all genetically diagnosable nemaline myopathies in our center, although mildly increased lipid droplets are also constantly observed features.
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23
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Liang WC, Jong YJ, Wang CH, Wang CH, Tian X, Chen WZ, Kan TM, Minami N, Nishino I, Wong LJC. Clinical, pathological, imaging, and genetic characterization in a Taiwanese cohort with limb-girdle muscular dystrophy. Orphanet J Rare Dis 2020; 15:160. [PMID: 32576226 PMCID: PMC7310488 DOI: 10.1186/s13023-020-01445-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 06/16/2020] [Indexed: 12/14/2022] Open
Abstract
Background Limb-girdle muscular dystrophy (LGMD) is a genetically heterogeneous, hereditary disease characterized by limb-girdle weakness and histologically dystrophic changes. The prevalence of each subtype of LGMD varies among different ethnic populations. This study for the first time analyzed the phenotypes and genotypes in Taiwanese patients with LGMD in a referral center for neuromuscular diseases (NMDs). Results We enrolled 102 patients clinically suspected of having LGMD who underwent muscle biopsy with subsequent genetic analysis in the previous 10 years. On the basis of different pathological categories, we performed sequencing of target genes or panel for NMDs and then identified patients with type 1B, 1E, 2A, 2B, 2D, 2I, 2G, 2 N, and 2Q. The 1B patients with LMNA mutation presented with mild limb-girdle weakness but no conduction defect at the time. All 1E patients with DES mutation exhibited predominantly proximal weakness along with distal weakness. In our cohort, 2B and 2I were the most frequent forms of LGMD; several common or founder mutations were identified, including c.1097_1099delACA (p.Asn366del) in DES, homozygous c.101G > T (p.Arg34Leu) in SGCA, homozygous c.26_33dup (p.Glu12Argfs*20) in TCAP, c.545A > G (p.Tyr182Cys), and c.948delC (p.Cys317Alafs*111) in FKRP. Clinically, the prevalence of dilated cardiomyopathy in our patients with LGMD2I aged > 18 years was 100%, much higher than that in European cohorts. The only patient with LGMD2Q with PLEC mutation did not exhibit skin lesions or gastrointestinal abnormalities but had mild facial weakness. Muscle imaging of LGMD1E and 2G revealed a more uniform involvement than did other LGMD types. Conclusion Our study revealed that detailed clinical manifestation together with muscle pathology and imaging remain critical in guiding further molecular analyses and are crucial for establishing genotype–phenotype correlations. We also determined the common mutations and prevalence for different subtypes of LGMD in our cohort, which could be useful when providing specific care and personalized therapy to patients with LGMD.
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Affiliation(s)
- Wen-Chen Liang
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,Translational Research Center of Neuromuscular Diseases, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Pediatrics, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yuh-Jyh Jong
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. .,Translational Research Center of Neuromuscular Diseases, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. .,Department of Laboratory Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan. .,Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
| | - Chien-Hua Wang
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chen-Hua Wang
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Xia Tian
- Baylor Genetics, Houston, TX, USA.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Wan-Zi Chen
- Department of Pathology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Tzu-Min Kan
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Narihiro Minami
- Department of Laboratory Medicine, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan.,Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Lee-Jun C Wong
- Baylor Genetics, Houston, TX, USA.,Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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24
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Cotta A, Carvalho E, da-Cunha-Junior AL, Navarro MM, Menezes MM, Paim JF, Valicek J, Lima MI, Velloso-Filho R, Freire-Lyra MH, Takata RI, Inoue M, Okubo M, Iida A, Nishino I. Clinical, imaging, morphologic, and molecular features of X-linked VMA21-related myopathy in two unrelated Brazilian families. J Neurol Sci 2020; 415:116977. [PMID: 32535249 DOI: 10.1016/j.jns.2020.116977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/31/2020] [Accepted: 06/02/2020] [Indexed: 11/16/2022]
Affiliation(s)
- Ana Cotta
- Department of Pathology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | - Elmano Carvalho
- Department of Neurophysiology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | | | - Monica M Navarro
- Department of Pediatrics and Genetics, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | - Miriam M Menezes
- Department of Neurology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | - Julia F Paim
- Department of Pathology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | - Jaquelin Valicek
- Department of Neurophysiology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil.
| | - Maria Isabel Lima
- Department of Electron Microscopy, SARAH Network of Rehabilitation Hospitals, Brasilia, (DF), Brazil.
| | - Roberto Velloso-Filho
- Department of Radiology, SARAH Network of Rehabilitation Hospitals, Belo Horizonte, (MG), Brazil..
| | | | - Reinaldo I Takata
- Department of Molecular Biology, SARAH Network of Rehabilitation Hospitals, Brasilia, (DF), Brazil.
| | - Michio Inoue
- Department of Neuromuscular Research, National Institute of Neuroscience; and Department of Genome Medicine Development, Medical Genome Center; National Center of Neurology and Psychiatry (NCNP). 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo, Japan.
| | - Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience; and Department of Genome Medicine Development, Medical Genome Center; National Center of Neurology and Psychiatry (NCNP). 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo, Japan.
| | - Aritoshi Iida
- Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP). 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo, Japan.
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience; and Department of Genome Medicine Development, Medical Genome Center; National Center of Neurology and Psychiatry (NCNP). 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo, Japan; Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry (NCNP). 4-1-1 Ogawahigashi-cho, Kodaira, Tokyo, Japan.
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25
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Gonzalez-Quereda L, Rodriguez MJ, Diaz-Manera J, Alonso-Perez J, Gallardo E, Nascimento A, Ortez C, Natera-de Benito D, Olive M, Gonzalez-Mera L, Lopez de Munain A, Zulaica M, Poza JJ, Jerico I, Torne L, Riera P, Milisenda J, Sanchez A, Garrabou G, Llano I, Madruga-Garrido M, Gallano P. Targeted Next-Generation Sequencing in a Large Cohort of Genetically Undiagnosed Patients with Neuromuscular Disorders in Spain. Genes (Basel) 2020; 11:E539. [PMID: 32403337 PMCID: PMC7288461 DOI: 10.3390/genes11050539] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 05/06/2020] [Accepted: 05/06/2020] [Indexed: 12/12/2022] Open
Abstract
The term neuromuscular disorder (NMD) includes many genetic and acquired diseases and differential diagnosis can be challenging. Next-generation sequencing (NGS) is especially useful in this setting given the large number of possible candidate genes, the clinical, pathological, and genetic heterogeneity, the absence of an established genotype-phenotype correlation, and the exceptionally large size of some causative genes such as TTN, NEB and RYR1. We evaluated the diagnostic value of a custom targeted next-generation sequencing gene panel to study the mutational spectrum of a subset of NMD patients in Spain. In an NMD cohort of 207 patients with congenital myopathies, distal myopathies, congenital and adult-onset muscular dystrophies, and congenital myasthenic syndromes, we detected causative mutations in 102 patients (49.3%), involving 42 NMD-related genes. The most common causative genes, TTN and RYR1, accounted for almost 30% of cases. Thirty-two of the 207 patients (15.4%) carried variants of uncertain significance or had an unidentified second mutation to explain the genetic cause of the disease. In the remaining 73 patients (35.3%), no candidate variant was identified. In combination with patients' clinical and myopathological data, the custom gene panel designed in our lab proved to be a powerful tool to diagnose patients with myopathies, muscular dystrophies and congenital myasthenic syndromes. Targeted NGS approaches enable a rapid and cost-effective analysis of NMD- related genes, offering reliable results in a short time and relegating invasive techniques to a second tier.
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Affiliation(s)
- Lidia Gonzalez-Quereda
- Genetics Dept. Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain; (M.J.R.); (P.R.); (P.G.)
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
| | - Maria Jose Rodriguez
- Genetics Dept. Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain; (M.J.R.); (P.R.); (P.G.)
| | - Jordi Diaz-Manera
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Neuromuscular Unit, Neurology Dept., Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain;
| | - Jorge Alonso-Perez
- Neuromuscular Unit, Neurology Dept., Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain;
| | - Eduard Gallardo
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Neuromuscular Unit, Neurology Dept., Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain;
| | - Andres Nascimento
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de Déu, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain;
| | - Carlos Ortez
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de Déu, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain;
| | - Daniel Natera-de Benito
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Neuromuscular Unit, Neuropaediatrics Department, Hospital Sant Joan de Déu, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain;
| | - Montse Olive
- Neuropathology Unit, Department of Pathology and Neuromuscular Unit, Department of Neurology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, 08907 Barcelona, Spain; (M.O.); (L.G.-M.)
| | - Laura Gonzalez-Mera
- Neuropathology Unit, Department of Pathology and Neuromuscular Unit, Department of Neurology, IDIBELL-Hospital de Bellvitge, Hospitalet de Llobregat, 08907 Barcelona, Spain; (M.O.); (L.G.-M.)
- Department of Neurology, Hospital de Viladecans, 08840 Barcelona, Spain
| | - Adolfo Lopez de Munain
- Biodonostia, Neurosciences Area, Neuromuscular diseases Laboratory, San Sebastian, 20014 Basque Country, Spain; (A.L.d.M.); (M.Z.)
- CIBERNED, Instituto de Salud Carlos III, Ministry of Science, Innovation and Universities, 28029 Madrid, Spain
- Department of Neurology, Hospital Universitario Donostia, San Sebastian, 20014 Basque Country, Spain;
- Department of Neurosciences, Faculty of Medicine and Dentistry, UPV-EHU, San Sebastian, 48940 Basque Country, Spain
| | - Miren Zulaica
- Biodonostia, Neurosciences Area, Neuromuscular diseases Laboratory, San Sebastian, 20014 Basque Country, Spain; (A.L.d.M.); (M.Z.)
- CIBERNED, Instituto de Salud Carlos III, Ministry of Science, Innovation and Universities, 28029 Madrid, Spain
| | - Juan Jose Poza
- Department of Neurology, Hospital Universitario Donostia, San Sebastian, 20014 Basque Country, Spain;
| | - Ivonne Jerico
- Navarre Institute for Health Research (IdiSNA), 31008 Pamplona, Spain; (I.J.); (L.T.)
- Department of Neurology, Complejo Hospitalario de Navarra, 31008 Pamplona, Spain
| | - Laura Torne
- Navarre Institute for Health Research (IdiSNA), 31008 Pamplona, Spain; (I.J.); (L.T.)
| | - Pau Riera
- Genetics Dept. Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain; (M.J.R.); (P.R.); (P.G.)
| | - Jose Milisenda
- Hospital Clinic de Barcelona and Universidad de Barcelona, 08036 Barcelona, Spain;
| | - Aurora Sanchez
- Department of Biochemistry and Molecular Genetics, Hospital Clinic de Barcelona, 08036 Barcelona, Spain;
| | - Gloria Garrabou
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Cellex, IDIBAPS, University of Barcelona-Hospital Clínic of Barcelona, 08036 Barcelona, Spain
| | - Isabel Llano
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
- Biocruces Bizkaia Health Research Institute, Barakaldo, 48903 Bizkaia, Spain
- Genetics Service, Cruces University Hospital, Osakidetza Basque Health Service, Barakaldo, 48903 Bizkaia, Spain
| | - Marcos Madruga-Garrido
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC, Universidad de Sevilla, 41013 Sevilla, Spain;
- Neuromuscular Disorder Unit, Pediatric Neurology Department, Hospital Universitario Virgen del Rocío, 41013 Sevilla, Spain
| | - Pia Gallano
- Genetics Dept. Hospital de Sant Pau, IIB Sant Pau, 08041 Barcelona, Spain; (M.J.R.); (P.R.); (P.G.)
- U705, U762, U703, 722 and GCV4 for Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 28029 Madrid, Spain; (J.D.-M.); (E.G.); (A.N.); (D.N.-d.B.); (G.G.); (I.L.)
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26
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Bevilacqua JA, Guecaimburu Ehuletche MDR, Perna A, Dubrovsky A, Franca MC, Vargas S, Hegde M, Claeys KG, Straub V, Daba N, Faria R, Periquet M, Sparks S, Thibault N, Araujo R. The Latin American experience with a next generation sequencing genetic panel for recessive limb-girdle muscular weakness and Pompe disease. Orphanet J Rare Dis 2020; 15:11. [PMID: 31931849 PMCID: PMC6958675 DOI: 10.1186/s13023-019-1291-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 12/27/2019] [Indexed: 02/08/2023] Open
Abstract
Background Limb-girdle muscular dystrophy (LGMD) is a group of neuromuscular disorders of heterogeneous genetic etiology with more than 30 directly related genes. LGMD is characterized by progressive muscle weakness involving the shoulder and pelvic girdles. An important differential diagnosis among patients presenting with proximal muscle weakness (PMW) is late-onset Pompe disease (LOPD), a rare neuromuscular glycogen storage disorder, which often presents with early respiratory insufficiency in addition to PMW. Patients with PMW, with or without respiratory symptoms, were included in this study of Latin American patients to evaluate the profile of variants for the included genes related to LGMD recessive (R) and LOPD and the frequency of variants in each gene among this patient population. Results Over 20 institutions across Latin America (Brazil, Argentina, Peru, Ecuador, Mexico, and Chile) enrolled 2103 individuals during 2016 and 2017. Nine autosomal recessive LGMDs and Pompe disease were investigated in a 10-gene panel (ANO5, CAPN3, DYSF, FKRP, GAA, SGCA, SGCB, SGCD, SGCG, TCAP) based on reported disease frequency in Latin America. Sequencing was performed with Illumina’s NextSeq500 and variants were classified according to ACMG guidelines; pathogenic and likely pathogenic were treated as one category (P) and variants of unknown significance (VUS) are described. Genetic variants were identified in 55.8% of patients, with 16% receiving a definitive molecular diagnosis; 39.8% had VUS. Nine patients were identified with Pompe disease. Conclusions The results demonstrate the effectiveness of this targeted genetic panel and the importance of including Pompe disease in the differential diagnosis for patients presenting with PMW.
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Affiliation(s)
- Jorge A Bevilacqua
- Departamento de Neurología y Neurocirugía, Hospital Clínico, Universidad de Chile, Santiago, Chile.,Departamento de Anatomía y Medicina Legal, Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Departamento de Neurología y Neurocirugía, Clínica Dávila, Santiago, Chile
| | | | - Abayuba Perna
- Institute of Neurology, Hospital de Clínicas, School of Medicine, UDELAR, Montevideo, Uruguay
| | - Alberto Dubrovsky
- Institute of Neuroscience, Favaloro Foundation, Buenos Aires, Argentina
| | - Marcondes C Franca
- Department of Neurology, University of Campinas-UNICAMP, Campinas, Sao Paulo, Brazil
| | - Steven Vargas
- Center of Neurology and Neurosurgery, Mexico City, Mexico
| | - Madhuri Hegde
- Global Laboratory Services, Diagnostics, PerkinElmer, Waltham, MA, USA
| | - Kristl G Claeys
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium.,Laboratory for Muscle Diseases and Neuropathies, Department of Neurosciences, KU Leuven, Campus Gasthuisberg, Leuven, Belgium
| | - Volker Straub
- John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle University, Centre for Life, Newcastle, United Kingdom
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27
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Okano S, Shimada S, Tanaka R, Okayama A, Kajihama A, Suzuki N, Nakau K, Takahashi S, Matsumoto N, Saitsu H, Tanboon J, Nishino I, Azuma H. Life-threatening muscle complications of COL4A1-related disorder. Brain Dev 2020; 42:93-97. [PMID: 31540749 DOI: 10.1016/j.braindev.2019.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 09/01/2019] [Accepted: 09/03/2019] [Indexed: 12/13/2022]
Abstract
COL4A1-related disorder is recognized as a systemic disease because the alpha 1 chain of type IV collagen, encoded by COL4A1, is essential for basement membrane stability. However, muscular manifestations related to this disorder are rarely reported. We report the case of a 2-year-old boy with porencephaly, who harbored a de novo COL4A1 mutation of c.1853G > A, p. (Gly618Glu) and exhibited recurrent rhabdomyolysis with viral or bacterial infections. Moreover, he developed obstructive hypertrophic cardiomyopathy which required surgical intervention. Skeletal muscle biopsy revealed findings compatible with fiber-type disproportion. Ultrastructural study demonstrated the similar findings previously reported in mice with Col4a1 mutation including collagen disarray and reduction of electron density in the basement membrane of capillary endothelial cells and muscle fibers. Dilated endoplasmic reticulum in the capillary endothelial cells is also noted. This report adds another disease spectrum of COL4A1 mutation which include porencephaly, hypertrophic cardiomyopathy, rhabdomyolysis and fiber-type disproportion.
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Affiliation(s)
- Satomi Okano
- Department of Pediatrics, Asahikawa Medical University, Japan.
| | - Sorachi Shimada
- Department of Pediatrics, Asahikawa Medical University, Japan
| | - Ryosuke Tanaka
- Department of Pediatrics, Asahikawa Medical University, Japan
| | - Akie Okayama
- Department of Pediatrics, Asahikawa Medical University, Japan
| | - Aya Kajihama
- Department of Pediatrics, Asahikawa Medical University, Japan
| | - Nao Suzuki
- Department of Pediatrics, Asahikawa Medical University, Japan
| | - Koichi Nakau
- Department of Pediatrics, Asahikawa Medical University, Japan
| | | | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Japan
| | - Hirotomo Saitsu
- Department of Biochemistry, Hamamatsu University School of Medicine, Japan
| | - Jantima Tanboon
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Japan; Departments of Genome Medicine Development and Clinical Genome Analysis, Medical Genome Center (MGC), NCNP, Japan
| | - Hiroshi Azuma
- Department of Pediatrics, Asahikawa Medical University, Japan
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Hara K, Miyata H, Nishino I. [A case of Japanese Laing type distal myopathy with a mutation in MYH7 gene]. Rinsho Shinkeigaku 2019; 59:823-828. [PMID: 31761835 DOI: 10.5692/clinicalneurol.cn-001333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A 67-year-old man developed weakness and atrophy of the anterior compartment of the lower leg at age 53 years, followed by weakness of proximal muscles of the upper limb. His father had difficulties in walking in his thirties and died of heart disease at age 45 years. He also had mild respiratory weakness without cardiac involvement. Muscle histology showed spheroid or cytoplasmic bodies-like inclusions with moth-eaten appearance and irregular intramyofibrillar network. Electron microscopy revealed abnormally thickened and disorganized Z lines (Z line streaming) between the surrounding myofibrils and electron-dense globular deposits. These pathological findings apparently suggested myofibrillar myopathy. However, genetic analysis revealed a mutation (c.5566G>A, p.E1856K) in MYH7 gene, that is responsible for Laing-type distal myopathy (LDM). This mutation was previously reported in a study from Austria. This is the first report of LDM in the Japanese population .
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Affiliation(s)
- Kenju Hara
- Department of Neurology, Akita Red Cross Hospital
| | - Hajime Miyata
- Department of Neuropathology, Akita Cerebrospinal and Cardiovascular Center
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neurology, National Center of Neurology and Psychiatry
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Palmio J, Jonson PH, Inoue M, Sarparanta J, Bengoechea R, Savarese M, Vihola A, Jokela M, Nakagawa M, Noguchi S, Olivé M, Masingue M, Kerty E, Hackman P, Weihl CC, Nishino I, Udd B. Mutations in the J domain of DNAJB6 cause dominant distal myopathy. Neuromuscul Disord 2019; 30:38-46. [PMID: 31955980 DOI: 10.1016/j.nmd.2019.11.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 01/28/2023]
Abstract
Eight patients from five families with undiagnosed dominant distal myopathy underwent clinical, neurophysiological and muscle biopsy examinations. Molecular genetic studies were performed using targeted sequencing of all known myopathy genes followed by segregation of the identified mutations in the affected families using Sanger sequencing. Two novel mutations in DNAJB6 J domain, c.149C>T (p.A50V) and c.161A>C (p.E54A), were identified as the cause of disease. The muscle involvement with p.A50V was distal calf-predominant, and the p.E54A was more proximo-distal. Histological findings were similar to those previously reported in DNAJB6 myopathy. In line with reported pathogenic mutations in the glycine/phenylalanine (G/F) domain of DNAJB6, both the novel mutations showed reduced anti-aggregation capacity by filter trap assay and TDP-43 disaggregation assays. Modeling of the protein showed close proximity of the mutated residues with the G/F domain. Myopathy-causing mutations in DNAJB6 are not only located in the G/F domain, but also in the J domain. The identified mutations in the J domain cause dominant distal and proximo-distal myopathy, confirming that mutations in DNAJB6 should be considered in distal myopathy cases.
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Affiliation(s)
- Johanna Palmio
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland.
| | - Per Harald Jonson
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Michio Inoue
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Jaakko Sarparanta
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Rocio Bengoechea
- Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA
| | - Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Anna Vihola
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Manu Jokela
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Division of Clinical Neurosciences, Turku University Hospital and University of Turku, Turku, Finland
| | - Masanori Nakagawa
- North Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoru Noguchi
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Montse Olivé
- Department of Pathology and Neuromuscular Unit, IDIBELL-Hospital de Bellvitge, Barcelona, Spain
| | - Marion Masingue
- University Hospital of Salpêtrière, UPMC, Institute of Myology, National Reference Center for Neuromuscular Disorders, Paris, France
| | - Emilia Kerty
- Department of Neurology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Conrad C Weihl
- Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA
| | - Ichizo Nishino
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Bjarne Udd
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
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30
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Shimomura H, Lee T, Tanaka Y, Awano H, Itoh K, Nishino I, Takeshima Y. Two closely spaced mutations in cis result in Ullrich congenital muscular dystrophy. Hum Genome Var 2019; 6:21. [PMID: 31044083 PMCID: PMC6486579 DOI: 10.1038/s41439-019-0052-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/25/2019] [Accepted: 04/02/2019] [Indexed: 11/11/2022] Open
Abstract
A 2-year-old boy was diagnosed with Ullrich congenital muscular dystrophy (UCMD) by muscle biopsy. COL6A3 gene analysis by next-generation sequencing revealed two heterozygous splice-site mutations (c.6283-1 G > G/T and c.6310-2 A > A/T), whereas normal mRNA was produced. Genomic DNA analysis revealed two mutations located on the same allele; however, no mutation was detected in either parent. These results indicated that two closely spaced de novo mutations resulted in the autosomal dominant UCMD.
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Affiliation(s)
- Hideki Shimomura
- 1Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Tomoko Lee
- 1Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Yasuhiko Tanaka
- 1Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
| | - Hiroyuki Awano
- 2Department of Pediatrics, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Kyoko Itoh
- 3Department of Pathology and Applied Neurobiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Ichizo Nishino
- 4Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yasuhiro Takeshima
- 1Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Japan
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Mitsuhashi S, Frith MC, Mizuguchi T, Miyatake S, Toyota T, Adachi H, Oma Y, Kino Y, Mitsuhashi H, Matsumoto N. Tandem-genotypes: robust detection of tandem repeat expansions from long DNA reads. Genome Biol 2019; 20:58. [PMID: 30890163 PMCID: PMC6425644 DOI: 10.1186/s13059-019-1667-6] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 03/01/2019] [Indexed: 01/03/2023] Open
Abstract
Tandemly repeated DNA is highly mutable and causes at least 31 diseases, but it is hard to detect pathogenic repeat expansions genome-wide. Here, we report robust detection of human repeat expansions from careful alignments of long but error-prone (PacBio and nanopore) reads to a reference genome. Our method is robust to systematic sequencing errors, inexact repeats with fuzzy boundaries, and low sequencing coverage. By comparing to healthy controls, we prioritize pathogenic expansions within the top 10 out of 700,000 tandem repeats in whole genome sequencing data. This may help to elucidate the many genetic diseases whose causes remain unknown.
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Affiliation(s)
- Satomi Mitsuhashi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Fukuura 3-9, Kanazawa-ku, Yokohama, 236-0004, Japan.
| | - Martin C Frith
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-3-26 Aomi, Koto-ku, Tokyo, 135-0064, Japan.
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan.
- Computational Bio Big-Data Open Innovation Laboratory (CBBD-OIL), AIST, Shinjuku-ku, Tokyo, Japan.
| | - Takeshi Mizuguchi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Fukuura 3-9, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Satoko Miyatake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Fukuura 3-9, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Tomoko Toyota
- Department of Neurology, University of Occupational and Environmental Health School of Medicine, Kitakyushu, Fukuoka, Japan
| | - Hiroaki Adachi
- Department of Neurology, University of Occupational and Environmental Health School of Medicine, Kitakyushu, Fukuoka, Japan
| | - Yoko Oma
- Department of Liberal Arts, Faculty of Medicine, Saitama Medical University, Iruma, Saitama, Japan
| | - Yoshihiro Kino
- Department of Bioinformatics and Molecular Neuropathology, Meiji Pharmaceutical University, Kiyose, Tokyo, Japan
| | - Hiroaki Mitsuhashi
- Department of Applied Biochemistry, School of Engineering, Tokai University, Hiratsuka, Kanagawa, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Fukuura 3-9, Kanazawa-ku, Yokohama, 236-0004, Japan
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Nishikawa A, Iida A, Hayashi S, Okubo M, Oya Y, Yamanaka G, Takahashi I, Nonaka I, Noguchi S, Nishino I. Three novel MTM1 pathogenic variants identified in Japanese patients with X-linked myotubular myopathy. Mol Genet Genomic Med 2019; 7:e621. [PMID: 30884204 PMCID: PMC6503166 DOI: 10.1002/mgg3.621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/28/2019] [Accepted: 02/11/2019] [Indexed: 01/06/2023] Open
Abstract
Background X‐linked myotubular myopathy (XLMTM) is a form of the severest congenital muscle diseases characterized by marked muscle weakness, hypotonia, and feeding and breathing difficulties in male infants. It is caused by mutations in the myotubularin gene (MTM1). Methods Evaluation of clinical history and examination of muscle pathology of three patients and comprehensive genome analysis on our original targeted gene panel system for muscular diseases. Results We report three patients, each of whom presents distinct muscle pathological features. The three patients have novel hemizygous MTM1 variants, including c.527A>G (p.Gln176Arg), c.595C>G (p.Pro199Ala), or c.688T>C (p.Trp230Arg). Conclusions All variants were assessed as “Class 4 (likely pathogenic)” on the basis of the guideline of American College of Medical Genetics and Genomics. These distinct pathological features among the patients with variants in the second cluster of PTP domain in MTM1 provides an insight into microheterogeneities in disease phenotypes in XLMTM.
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Affiliation(s)
- Atsuko Nishikawa
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Aritoshi Iida
- Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Shinichiro Hayashi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yasushi Oya
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Gaku Yamanaka
- Department of Pediatrics, Tokyo Medical University Hospital, Tokyo, Japan
| | - Ikuko Takahashi
- Department of Pediatrics, Akita University, Faculty of Medicine, Akita, Japan
| | - Ikuya Nonaka
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.,Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
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Hamanaka K, Miyatake S, Koshimizu E, Tsurusaki Y, Mitsuhashi S, Iwama K, Alkanaq AN, Fujita A, Imagawa E, Uchiyama Y, Tawara N, Ando Y, Misumi Y, Okubo M, Nakashima M, Mizuguchi T, Takata A, Miyake N, Saitsu H, Iida A, Nishino I, Matsumoto N. RNA sequencing solved the most common but unrecognized NEB pathogenic variant in Japanese nemaline myopathy. Genet Med 2018; 21:1629-1638. [PMID: 30467404 DOI: 10.1038/s41436-018-0360-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 10/31/2018] [Indexed: 12/20/2022] Open
Abstract
PURPOSE The diagnostic rate for Mendelian diseases by exome sequencing (ES) is typically 20-40%. The low rate is partly because ES misses deep-intronic or synonymous variants leading to aberrant splicing. In this study, we aimed to apply RNA sequencing (RNA-seq) to efficiently detect the aberrant splicings and their related variants. METHODS Aberrant splicing in biopsied muscles from six nemaline myopathy (NM) cases unresolved by ES were analyzed with RNA-seq. Variants related to detected aberrant splicing events were analyzed with Sanger sequencing. Detected variants were screened in NM patients unresolved by ES. RESULTS We identified a novel deep-intronic NEB pathogenic variant, c.1569+339A>G in one case, and another novel synonymous NEB pathogenic variant, c.24684G>C (p.Ser8228Ser) in three cases. The c.24684G>C variant was observed to be the most frequent among all NEB pathogenic variants in normal Japanese populations with a frequency of 1 in 178 (20 alleles in 3552 individuals), but was previously unrecognized. Expanded screening of the variant identified it in a further four previously unsolved nemaline myopathy cases. CONCLUSION These results indicated that RNA-seq may be able to solve a large proportion of previously undiagnosed muscle diseases.
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Affiliation(s)
- Kohei Hamanaka
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Satoko Miyatake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan.,Clinical Genetics Department, Yokohama City University Hospital, Yokohama, Kanagawa, Japan
| | - Eriko Koshimizu
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Yoshinori Tsurusaki
- Clinical Research Institute, Kanagawa Children's Medical Center, Yokohama, Kanagawa, Japan
| | - Satomi Mitsuhashi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Kazuhiro Iwama
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Ahmed N Alkanaq
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Atsushi Fujita
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Eri Imagawa
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Yuri Uchiyama
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Nozomu Tawara
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yukio Ando
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Yohei Misumi
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Mitsuko Nakashima
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Takeshi Mizuguchi
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Atsushi Takata
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Noriko Miyake
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Hirotomo Saitsu
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Aritoshi Iida
- Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan.
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Okubo M, Iida A, Hayashi S, Mori-Yoshimura M, Oya Y, Watanabe A, Arahata H, El Sherif R, Noguchi S, Nishino I. Three novel recessive DYSF mutations identified in three patients with muscular dystrophy, limb-girdle, type 2B. J Neurol Sci 2018; 395:169-171. [PMID: 30366248 DOI: 10.1016/j.jns.2018.10.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/26/2018] [Accepted: 10/15/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Mariko Okubo
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan; Department of Pediatrics, Graduate School of Medicine and Faculty of Medicine, The University Tokyo, Tokyo, Japan
| | - Aritoshi Iida
- Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Shinichiro Hayashi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Madoka Mori-Yoshimura
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Yasushi Oya
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Akihiro Watanabe
- Department of Neurology, National Hospital Organization Omuta Hospital, Fukuoka, Japan
| | - Hajime Arahata
- Department of Neurology, National Hospital Organization Omuta Hospital, Fukuoka, Japan
| | | | - Satoru Noguchi
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan; Department of Clinical Genome Analysis, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan.
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35
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Wang L, Zhang VW, Li S, Li H, Sun Y, Li J, Zhu Y, He R, Lin J, Zhang C. The clinical spectrum and genetic variability of limb-girdle muscular dystrophy in a cohort of Chinese patients. Orphanet J Rare Dis 2018; 13:133. [PMID: 30107846 PMCID: PMC6092860 DOI: 10.1186/s13023-018-0859-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 06/27/2018] [Indexed: 12/19/2022] Open
Abstract
Background Limb-girdle muscular dystrophy (LGMD) is a commonly diagnosed hereditary muscular disorder, characterized by the progressive weakness of the limb-girdle muscles. Although the condition has been well-characterized, clinical and genetic heterogeneity can be observed in patients with LGMD. Here, we aimed to describe the clinical manifestations and genetic variability among a cohort of patients with LGMD in South China. Results We analyzed the clinical information, muscle magnetic resonance imaging (MRI) findings, and genetic results obtained from 30 patients (24 families) with clinically suspected LGMD. In 24 probands, 38 variants were found in total, of which 18 were shown to be novel. Among the 30 patients, the most common subtypes were dysferlinopathy in eight (26.67%), sarcoglycanopathies in eight [26.67%; LGMD 2C in three (10.00%), LGMD 2D in three (10.00%), and LGMD 2F in two (6.67%)], LGMD 2A in seven (23.33%), followed by LGMD 1B in three (10.00%), LGMD 2I in three (10.00%), and early onset recessive Emery-Dreifuss-like phenotype without cardiomyopathy in one (3.33%). Furthermore, we also observed novel clinical presentations for LGMD 1B, 2F, and 2I patients with hypermobility of the joints in the upper limbs, a LGMD 2F patient with delayed language development, and other manifestations. Moreover, distinct distributions of fatty infiltration in patients with LGMD 2A, dysferlinopathy, and the early onset recessive Emery-Dreifuss-like phenotype without cardiomyopathy were also observed based on muscle MRI results. Conclusions In this study, we expanded the clinical spectrum and genetic variability found in patients with LGMD, which provided additional insights into genotype and phenotype correlations in this disease. Electronic supplementary material The online version of this article (10.1186/s13023-018-0859-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Liang Wang
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Victor Wei Zhang
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, 77030, USA.,AmCare Genomics Lab, Guangzhou, 510300, GD, China
| | - Shaoyuan Li
- AmCare Genomics Lab, Guangzhou, 510300, GD, China
| | - Huan Li
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Yiming Sun
- Department of Health Care, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080, GD, China
| | - Jing Li
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Yuling Zhu
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Ruojie He
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Jinfu Lin
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China
| | - Cheng Zhang
- Department of Neurology, National Key Clinical Department and Key Discipline of Neurology, The First Affiliated Hospital, Sun Yat-sen University, 58 Zhongshan 2 Road, Guangzhou, 510080, GD, China.
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A novel LMNA mutation identified in a Japanese patient with LMNA-associated congenital muscular dystrophy. Hum Genome Var 2018; 5:19. [PMID: 30083363 PMCID: PMC6054619 DOI: 10.1038/s41439-018-0018-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/30/2018] [Accepted: 06/04/2018] [Indexed: 02/02/2023] Open
Abstract
LMNA-associated congenital muscular dystrophy (L-CMD) is a severe form of muscle laminopathy. LMNA encodes lamin A, which an intermediate filament protein that attaches to the inner membrane of the nuclear envelope. We performed sequence analysis based on our original targeted gene panel system for muscle diseases to obtain a molecular diagnosis in a Japanese girl with L-CMD. A novel heterozygous missense mutation, c.115A>C (p.Asn39His), in LMNA is reported.
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Two novel VCP missense variants identified in Japanese patients with multisystem proteinopathy. Hum Genome Var 2018; 5:9. [PMID: 29899994 PMCID: PMC5976715 DOI: 10.1038/s41439-018-0009-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 04/06/2018] [Accepted: 04/13/2018] [Indexed: 01/10/2023] Open
Abstract
VCP mutations were first associated with inclusion body myopathy with Paget’s disease of bone and frontotemporal dementia (IBMPFD) but was later associated with amyotrophic lateral sclerosis and Charcot–Marie–Tooth disease. Now, a new name, “multisystem proteinopathy (MSP)”, is proposed for this condition. VCP encodes valosin-containing protein, which is involved in protein degradation in the ubiquitin proteasome system. We report here two MSP patients with two novel heterozygous missense variants in VCP: c.259G>T (p.Val87Phe) and c.376A>G (p.Ile126Val).
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Abstract
PURPOSE OF REVIEW The development of massively parallel sequencing (MPS) has revolutionized molecular genetic diagnostics in monogenic disorders. The present review gives a brief overview of different MPS-based approaches used in clinical diagnostics of neuromuscular disorders (NMDs) and highlights their advantages and limitations. RECENT FINDINGS MPS-based approaches like gene panel sequencing, (whole) exome sequencing, (whole) genome sequencing, and RNA sequencing have been used to identify the genetic cause in NMDs. Although gene panel sequencing has evolved as a standard test for heterogeneous diseases, it is still debated, mainly because of financial issues and unsolved problems of variant interpretation, whether genome sequencing (and to a lesser extent also exome sequencing) of single patients can already be regarded as routine diagnostics. However, it has been shown that the inclusion of parents and additional family members often leads to a substantial increase in the diagnostic yield in exome-wide/genome-wide MPS approaches. In addition, MPS-based RNA sequencing just enters the research and diagnostic scene. SUMMARY Next-generation sequencing increasingly enables the detection of the genetic cause in highly heterogeneous diseases like NMDs in an efficient and affordable way. Gene panel sequencing and family-based exome sequencing have been proven as potent and cost-efficient diagnostic tools. Although clinical validation and interpretation of genome sequencing is still challenging, diagnostic RNA sequencing represents a promising tool to bypass some hurdles of diagnostics using genomic DNA.
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Mizuno Y, Mori-Yoshimura M, Oya Y, Nishikawa A, Nishino I, Takahashi Y. [Two cases of nemaline myopathy presenting with hypertrophy of distal limbs with prominent asymmetry]. Rinsho Shinkeigaku 2017; 57:691-697. [PMID: 29070751 DOI: 10.5692/clinicalneurol.cn-001024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Nemaline myopathy commonly presents with symmetrical proximal weakness. Here we report two cases of nemaline myopathy presenting with distal dominant involvement with prominent asymmetry. Case 1 was a 37-year-old man who recalled frequently falling down and had right calf atrophy since he was 3-years-old. He had right calf muscle atrophy and weakness and steppage gait; his cardiopulmonary function was normal. Case 2 was a 35-year-old man with right calf muscle atrophy and weakness since childhood. He had right dominant distal leg weakness and atrophy together with respiratory failure and started noninvasive positive pressure ventilation. He also developed cardiomyopathy and died from acute respiratory failure due to pneumonia at age 39. Both cases harbored compound heterozygous nebulin (NEB) mutations with c.20131 C>T:p.Arg6711Trp and a nonsense mutation. Nemaline myopathy associated with NEB mutations can present as distal dominant myopathy with prominent asymmetry.
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Affiliation(s)
- Yukio Mizuno
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry.,Department of Neurology, Yokohama Asahi Chuo General Hospital
| | - Madoka Mori-Yoshimura
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry
| | - Yasushi Oya
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry
| | - Atsuko Nishikawa
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry.,Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry
| | - Yuji Takahashi
- Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry
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Harris E, Topf A, Barresi R, Hudson J, Powell H, Tellez J, Hicks D, Porter A, Bertoli M, Evangelista T, Marini-Betollo C, Magnússon Ó, Lek M, MacArthur D, Bushby K, Lochmüller H, Straub V. Exome sequences versus sequential gene testing in the UK highly specialised Service for Limb Girdle Muscular Dystrophy. Orphanet J Rare Dis 2017; 12:151. [PMID: 28877744 PMCID: PMC5588739 DOI: 10.1186/s13023-017-0699-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 08/22/2017] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Limb girdle muscular dystrophies are a group of rare and genetically heterogeneous diseases that share proximal weakness as a common feature; however they are often lacking very specific phenotypic features to allow an accurate differential diagnosis based on the clinical signs only, limiting the diagnostic rate using phenotype driven genetic testing. Next generation sequencing provides an opportunity to obtain molecular diagnoses for undiagnosed patients, as well as identifying novel genetic causes of muscle diseases. We performed whole exome sequencing (WES) on 104 affected individuals from 75 families in who standard gene by gene testing had not yielded a diagnosis. For comparison we also evaluated the diagnostic rate using sequential gene by gene testing for 91 affected individuals from 84 families over a 2 year period. RESULTS Patients selected for WES had undergone more extensive prior testing than those undergoing standard genetic testing and on average had had 8 genes screened already. In this extensively investigated cohort WES identified the genetic diagnosis in 28 families (28/75, 37%), including the identification of the novel gene ZAK and two unpublished genes. WES of a single affected individual with sporadic disease yielded a diagnosis in 13/38 (34%) of cases. In comparison, conventional gene by gene testing provided a genetic diagnosis in 28/84 (33%) families. Titinopathies and collagen VI related dystrophy were the most frequent diagnoses made by WES. Reasons why mutations in known genes were not identified previously included atypical phenotypes, reassignment of pathogenicity of variants, and in one individual mosaicism for a COL6A1 mutation which was undetected by prior direct sequencing. CONCLUSION WES was able to overcome many limitations of standard testing and achieved a higher rate of diagnosis than standard testing even in this cohort of extensively investigated patients. Earlier application of WES is therefore likely to yield an even higher diagnostic rate. We obtained a high diagnosis rate in simplex cases and therefore such individuals should be included in exome or genome sequencing projects. Disease due to somatic mosaicism may be increasingly recognised due to the increased sensitivity of next generation sequencing techniques to detect low level mosaicism.
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Affiliation(s)
- Elizabeth Harris
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Ana Topf
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Rita Barresi
- Muscle Immunoanalysis Unit, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, NE2 4AZ, UK
| | - Judith Hudson
- Northern Genetics Service, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Helen Powell
- Northern Genetics Service, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - James Tellez
- Northern Genetics Service, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Debbie Hicks
- Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne, UK
| | - Anna Porter
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Marta Bertoli
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Teresinha Evangelista
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Chiara Marini-Betollo
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | | | - Monkol Lek
- Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, USA
| | - Daniel MacArthur
- Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, USA
| | - Kate Bushby
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Hanns Lochmüller
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK
| | - Volker Straub
- The John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Central Parkway, Newcastle upon Tyne, NE1 3BZ, UK. .,Newcastle University John Walton Muscular Dystrophy Research Centre, Institute of Genetic Medicine, Newcastle upon Tyne, UK.
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Schuelke M, Øien NC, Oldfors A. Myopathology in the times of modern genetics. Neuropathol Appl Neurobiol 2017; 43:44-61. [DOI: 10.1111/nan.12374] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 12/03/2016] [Accepted: 12/23/2016] [Indexed: 12/14/2022]
Affiliation(s)
- M. Schuelke
- Department of Neuropediatrics and NeuroCure Clinical Research Center; Charité-Universitätsmedizin; Berlin Germany
| | - N. C. Øien
- Department of Neuropediatrics and NeuroCure Clinical Research Center; Charité-Universitätsmedizin; Berlin Germany
- Max-Delbrück-Center for Molecular Medicine; Berlin Germany
| | - A. Oldfors
- Department of Pathology and Genetics; Institute of Biomedicine; University of Gothenburg; Gothenburg Sweden
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Liang WC, Tian X, Yuo CY, Chen WZ, Kan TM, Su YN, Nishino I, Wong LJC, Jong YJ. Comprehensive target capture/next-generation sequencing as a second-tier diagnostic approach for congenital muscular dystrophy in Taiwan. PLoS One 2017; 12:e0170517. [PMID: 28182637 PMCID: PMC5300266 DOI: 10.1371/journal.pone.0170517] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 01/05/2017] [Indexed: 11/19/2022] Open
Abstract
PURPOSE Congenital muscular dystrophy (CMD) is a heterogeneous disease entity. The detailed clinical manifestation and causative gene for each subgroup of CMD are quite variable. This study aims to analyze the phenotypes and genotypes of Taiwanese patients with CMD as the epidemiology of CMD varies among populations and has been scantly described in Asia. METHODS A total of 48 patients suspected to have CMD were screened and categorized by histochemistry and immunohistochemistry studies. Different genetic analyses, including next-generation sequencing (NGS), were selected, based on the clinical and pathological findings. RESULTS We identified 17 patients with sarcolemma-specific collagen VI deficiency (SSCD), 6 patients with merosin deficiency, two with reduced alpha-dystroglycan staining, and two with striking lymphocyte infiltration in addition to dystrophic change on muscle pathology. Fourteen in 15 patients with SSCD, were shown to have COL6A1, COL6A2 or COL6A3 mutations by NGS analysis; all showed marked distal hyperlaxity and normal intelligence but the overall severity was less than in previously reported patients from other populations. All six patients with merosin deficiency had mutations in LAMA2. They showed relatively uniform phenotype that were compatible with previous studies, except for higher proportion of mental retardation with epilepsy. With reduced alpha-dystroglycan staining, one patient was found to carry mutations in POMT1 while another patient carried mutations in TRAPPC11. LMNA mutations were found in the two patients with inflammatory change on muscle pathology. They were clinically characterized by neck flexion limitation and early joint contracture, but no cardiac problem had developed yet. CONCLUSION Muscle pathology remains helpful in guiding further molecular analyses by direct sequencing of certain genes or by target capture/NGS as a second-tier diagnostic tool, and is crucial for establishing the genotype-phenotype correlation. We also determined the frequencies of the different types of CMD in our cohort which is important for the development of a specific care system for each disease.
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Affiliation(s)
- Wen-Chen Liang
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Pediatrics, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Xia Tian
- Baylor Genetics, Houston Texas, United States of America
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston Texas, United States of America
| | - Chung-Yee Yuo
- Department of Biomedical Science and Environmental Biology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Wan-Zi Chen
- Department of Pathology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Tsu-Min Kan
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yi-Ning Su
- Sofiva Genomics Co., Ltd., Taipei, Taiwan
- Dianthus Maternal Fetal Medicine Clinic, Taipei, Taiwan
- Department of Obstetrics and Gynecology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
- Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Lee-Jun C. Wong
- Baylor Genetics, Houston Texas, United States of America
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston Texas, United States of America
| | - Yuh-Jyh Jong
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Laboratory Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Biological Science and Technology, College of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
- * E-mail: ,
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