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Anthony Blaeser, Hiroyuki Awano, Bo Wu, Qi-Long Lu
Mutations in the gene for fukutin-related protein represent a subset of muscular dystrophies known as dystroglycanopathies characterized by loss of functionally-glycosylated-alpha-dystroglycan and a wide range of dystrophic phenotypes. Mice generated by our lab containing the P448L mutation in the fukutin-related protein gene demonstrate the dystrophic phenotype similar to that of LGMD2I. Here we examined the morphology of the heart and diaphragm, focusing on pathology of diaphragm and cardiac function of the mutant mice for up to 12 months...
2016: PloS One
Joseph W Maricelli, Qi L Lu, David C Lin, Buel D Rodgers
Limb-girdle muscular dystrophy type 2i (LGMD2i) affects thousands of lives with shortened life expectancy mainly due to cardiac and respiratory problems and difficulty with ambulation significantly compromising quality of life. Limited studies have noted impaired gait in patients and animal models of different muscular dystrophies, but not in animal models of LGMD2i. Our goal, therefore, was to quantify gait metrics in the fukutin-related protein P448L mutant (P448L) mouse, a recently developed model for LGMD2i...
2016: PloS One
Nicoline Løkken, Gitte Hedermann, Carsten Thomsen, John Vissing
We investigated whether a linear relationship between muscle strength and cross-sectional area (CSA) is preserved in calf muscles of patients with Becker muscular dystrophy (BMD, n = 14) and limb-girdle type 2I muscular dystrophy (LGMD2I, n = 11), before and after correcting for muscle fat infiltration. The Dixon magnetic resonance imaging technique was used to quantify fat and calculate a fat-free contractile CSA. Strength was assessed by dynamometry. Muscle strength/CSA relationships were significantly lower in patients versus controls...
September 2016: Annals of Neurology
Xiaona Fu, Haipo Yang, Cuijie Wei, Hui Jiao, Shuo Wang, Yanling Yang, Chunxi Han, Xiru Wu, Hui Xiong
Mutations in the fukutin-related protein (FKRP) gene have been associated with dystroglycanopathies, which are common in Europe but rare in Asia. Our study aimed to retrospectively analyze and characterize the clinical, myopathological and genetic features of 12 Chinese patients with FKRP mutations. Three patients were diagnosed with congenital muscular dystrophy type 1C (MDC1C) and nine patients were diagnosed with limb girdle muscular dystrophy type 2I (LGMD2I). Three muscle biopsy specimens had dystrophic changes and reduced glycosylated α-dystroglycan staining, and two showed reduced expression of laminin α2...
December 2016: Journal of Human Genetics
Mariko Taniguchi-Ikeda, Ichiro Morioka, Kazumoto Iijima, Tatsushi Toda
α-Dystroglycanopathy, an autosomal recessive disease, is associated with the development of a variety of diseases, including muscular dystrophy. In humans, α-dystroglycanopathy includes various types of congenital muscular dystrophy such as Fukuyama type congenital muscular dystrophy (FCMD), muscle eye brain disease (MEB), and the Walker Warburg syndrome (WWS), and types of limb girdle muscular dystrophy 2I (LGMD2I). α-Dystroglycanopathy share a common etiology, since it is invariably caused by gene mutations that are associated with the O-mannose glycosylation pathway of α-dystroglycan (α-DG)...
October 2016: Molecular Aspects of Medicine
Marius Kuhn, Dieter Gläser, Pushpa Raj Joshi, Stephan Zierz, Stephan Wenninger, Benedikt Schoser, Marcus Deschauer
Limb-girdle muscular dystrophies (LGMDs) are genetically heterogeneous and the diagnostic work-up including conventional genetic testing using Sanger sequencing remains complex and often unsatisfactory. We performed targeted sequencing of 23 LGMD-related genes and 15 genes in which alterations result in a similar phenotype in 58 patients with genetically unclassified LGMDs. A genetic diagnosis was possible in 19 of 58 patients (33 %). LGMD2A was the most common form, followed by LGMD2L and LGMD2I. In two patients, pathogenic mutations were identified in genes that are not classified as LGMD genes (glycogen branching enzyme and valosin-containing protein)...
April 2016: Journal of Neurology
J Svahn, N Streichenberger, O Benveniste, R Menassa, L Michel, H Fayolle, P Petiot
Necrotizing myopathies can be encountered in various conditions as acquired myopathies (toxic or autoimmune) or muscular dystrophies. We report a twenty-year-old Caucasian woman who presented with clinical findings suggestive of an inflammatory myopathy: subacute onset of lower limb muscle weakness, myalgia, weight loss and absence of family history. The serum creatine kinase level was elevated at 4738 IU/L (normal range, 25-175 IU/L). Muscle biopsy was consistent with necrotizing myopathy. The patient showed significant clinical improvement following corticosteroid, azathioprine and intravenous immunoglobulin treatments...
November 2015: Neuromuscular Disorders: NMD
Atchayaram Nalini, Kiran Polavarapu, Balaraju Sunitha, Sandhya Kulkarni, Narayanappa Gayathri, M M Srinivas Bharath, Sailesh Modi, Veeramani Preethish-Kumar
OBJECTIVE: In this prospective study conducted over 2 years, 300 nonconsecutive cases of autosomal recessive limb girdle muscular dystrophies (AR-LGMD) were characterized, based on phenotypic features, biochemical findings, electrophysiological studies, muscle immunohistochemistry (IHC), and western blot (WB) analysis. METHODS: Muscle biopsy was performed in 280 index cases. 226 biopsies were subjected for IHC, and, 176 of these for WB analysis. RESULTS: A total of 246 patients were finally analyzed...
July 2015: Neurology India
Gabriele Siciliano, Costanza Simoncini, Stefano Giannotti, Virna Zampa, Corrado Angelini, Giulia Ricci
Different genetic mutations underlying distinct pathogenic mechanisms have been identified as cause of muscle fibers degeneration and strength loss in limb girdle muscular dystrophies (LGMD). As a consequence, exercise tolerance is affected in patients with LGMD, either as a direct consequence of the loss of muscle fibers or secondary to the sedentary lifestyle due to the motor impairment. It has been debated for many years whether or not muscle exercise is beneficial or harmful for patients with myopathic disorders...
May 2015: Acta Myologica: Myopathies and Cardiomyopathies: Official Journal of the Mediterranean Society of Myology
Helle Petri, Marie-Louise Sveen, Jens Jakob Thune, Christoffer Vissing, Julia Rebecka Dahlqvist, Nanna Witting, Henning Bundgaard, Lars Køber, John Vissing
AIM: To assess the degree and progression of cardiac involvement in patients with limb-girdle type 2 (LGMD2) and Becker muscular dystrophies (BMD). METHODS: A follow-up study of 100 LGMD2 (types A-L) and 30 BMD patients assessed by electrocardiogram (ECG) and echocardiography, supplemented by Holter-monitoring at follow-up. RESULTS: After a median of 8.9years (range 0.4-13.7), twelve patients had died: LGMD2 (n=10, mean age 61±11years), BMD (n=2, age 43 and 45years)...
March 1, 2015: International Journal of Cardiology
Kristýna Stehlíková, Daniela Skálová, Jana Zídková, Lenka Mrázová, Petr Vondráček, Radim Mazanec, Stanislav Voháňka, Jana Haberlová, Markéta Hermanová, Josef Zámečník, Ondřej Souček, Hana Ošlejšková, Nina Dvořáčková, Pavla Solařová, Lenka Fajkusová
BACKGROUND: Autosomal recessive limb-girdle muscular dystrophies (LGMD2) include a number of disorders with heterogeneous etiology that cause predominantly weakness and wasting of the shoulder and pelvic girdle muscles. In this study, we determined the frequency of LGMD subtypes within a cohort of Czech LGMD2 patients using mutational analysis of the CAPN3, FKRP, SGCA, and ANO5 genes. METHODS: PCR-sequencing analysis; sequence capture and targeted resequencing. RESULTS: Mutations of the CAPN3 gene are the most common cause of LGMD2, and mutations in this gene were identified in 71 patients in a set of 218 Czech probands with a suspicion of LGMD2...
2014: BMC Neurology
Chunping Qiao, Chi-Hsien Wang, Chunxia Zhao, Peijuan Lu, Hiroyuki Awano, Bin Xiao, Jianbin Li, Zhenhua Yuan, Yi Dai, Carrie Bette Martin, Juan Li, Qilong Lu, Xiao Xiao
Mutations in fukutin-related protein (FKRP) gene cause a wide spectrum of disease phenotypes including the mild limb-girdle muscular dystrophy 2I (LGMD2I), the severe Walker-Warburg syndrome, and muscle-eye-brain disease. FKRP deficiency results in α-dystroglycan (α-DG) hypoglycosylation in the muscle and heart, which is a biochemical hallmark of dystroglycanopathies. To study gene replacement therapy, we generated and characterized a new mouse model of LGMD2I harboring the human mutation leucine 276 to isoleucine (L276I) in the mouse alleles...
November 2014: Molecular Therapy: the Journal of the American Society of Gene Therapy
Vincenzo Nigro, Marco Savarese
Limb-girdle muscular dystrophies (LGMD) are a highly heterogeneous group of muscle disorders, which first affect the voluntary muscles of the hip and shoulder areas. The definition is highly descriptive and less ambiguous by exclusion: non-Xlinked, non-FSH, non-myotonic, non-distal, nonsyndromic, and non-congenital. At present, the genetic classification is becoming too complex, since the acronym LGMD has also been used for a number of other myopathic disorders with overlapping phenotypes. Today, the list of genes to be screened is too large for the gene-by-gene approach and it is well suited for targeted next generation sequencing (NGS) panels that should include any gene that has been so far associated with a clinical picture of LGMD...
May 2014: Acta Myologica: Myopathies and Cardiomyopathies: Official Journal of the Mediterranean Society of Myology
Tracey A Willis, Kieren G Hollingsworth, Anna Coombs, Marie-Louise Sveen, Soren Andersen, Tanya Stojkovic, Michelle Eagle, Anna Mayhew, Paulo Loureiro de Sousa, Liz Dewar, Jasper M Morrow, Christopher D J Sinclair, John S Thornton, Kate Bushby, Hanns Lochmuller, Michael G Hanna, Jean-Yves Hogrel, Pierre G Carlier, John Vissing, Volker Straub
We conducted a prospective multinational study of muscle pathology using magnetic resonance imaging (MRI) in patients with limb-girdle muscular dystrophy 2I (LGMD2I). Thirty eight adult ambulant LGMD2I patients (19 male; 19 female) with genetically identical mutations (c.826C>A) in the fukutin-related protein (FKRP) gene were recruited. In each patient, T1-weighted (T1w) imaging was assessed by qualitative grading for 15 individual lower limb muscles and quantitative Dixon imaging was analysed on 14 individual lower limb muscles by region of interest analysis...
2014: PloS One
Patricia Hafner, Ulrike Bonati, Arne Fischmann, Jacques Schneider, Stephan Frank, Deborah J Morris-Rosendahl, Anamaria Dumea, Karl Heinimann, Dirk Fischer
Alpha-dystroglycanopathies form a genetically heterogeneous group of congenital muscular dystrophies with a large variety of clinical phenotypes. Within this group mutations in the protein O-mannosyltransferase genes (POMT1 and POMT2) are known to cause a spectrum of CMD disorders including the Walker-Warburg Syndrome with severe brain and ocular malformations, and the limb girdle muscular dystrophy with and without mental retardation. In this case report the clinical phenotype and brain and muscle MRI findings of two siblings of 10 and 7years (male/female) homozygous for a novel mutation in the POMT1 gene (c...
April 2014: Neuromuscular Disorders: NMD
Magnhild Rasmussen, David Scheie, Noralv Breivik, Marit Mork, Sigurd Lindal
AIM: To describe patients diagnosed with limb girdle muscular dystrophy 2I (LGMD2I) in our paediatric departments between 2004 and 2012. METHODS: The hospital charts of 17 patients presenting for evaluation at a mean age of 7.8 years (range 1-13 years) were retrospectively reviewed. RESULTS: With one exception, all patients were homozygous for the common mutation c.826C>A in the FKRP gene. Three patients experienced transient pronounced weakness as toddlers...
May 2014: Acta Paediatrica
F Hanisch, C Kronenberger, S Zierz, M Kornhuber
OBJECTIVE: Pathological spontaneous activity (PSA) in electromyography (EMG) has not yet been systematically analysed in various types of myopathies. METHODS: 136 Patients with well-defined myopathies were retrospectively analysed for the presence of PSA in distal, proximal, and paravertebral muscles. PSA comprised fibrillations (fib)/positive sharp waves (PSW) and high frequency discharges (HFD; i.e., myotonic and complex repetitive discharges). RESULTS: fib/PSW occurred more frequently than HFD...
July 2014: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Tracey A Willis, Kieren G Hollingsworth, Anna Coombs, Marie-Louise Sveen, Søren Andersen, Tanya Stojkovic, Michelle Eagle, Anna Mayhew, Paulo L de Sousa, Liz Dewar, Jasper M Morrow, Christopher D J Sinclair, John S Thornton, Kate Bushby, Hanns Lochmüller, Michael G Hanna, Jean-Yves Hogrel, Pierre G Carlier, John Vissing, Volker Straub
BACKGROUND: Outcome measures for clinical trials in neuromuscular diseases are typically based on physical assessments which are dependent on patient effort, combine the effort of different muscle groups, and may not be sensitive to progression over short trial periods in slow-progressing diseases. We hypothesised that quantitative fat imaging by MRI (Dixon technique) could provide more discriminating quantitative, patient-independent measurements of the progress of muscle fat replacement within individual muscle groups...
2013: PloS One
Simon Hauerslev, Marie L Sveen, John Vissing, Thomas O Krag
Patients with Limb girdle muscular dystrophy type 2I (LGMD2I) are characterized by progressive muscle weakness and wasting primarily in the proximal muscles, while distal muscles often are spared. Our aim was to investigate if wasting could be caused by impaired regeneration in the proximal compared to distal muscles. Biopsies were simultaneously obtained from proximal and distal muscles of the same patients with LGMD2I (n = 4) and healthy subjects (n = 4). The level of past muscle regeneration was evaluated by counting internally nucleated fibers and determining actively regenerating fibers by using the developmental markers embryonic myosin heavy chain (eMHC) and neural cell adhesion molecule (NCAM) and also assessing satellite cell activation status by myogenin positivity...
2013: PloS One
Wen-Chen Liang, Yukiko K Hayashi, Megumu Ogawa, Chien-Hua Wang, Wan-Ting Huang, Ichizo Nishino, Yuh-Jyh Jong
Alpha-dystroglycanopathy is caused by the glycosylation defects of α-dystroglycan (α-DG). The clinical spectrum ranges from severe congenital muscular dystrophy (CMD) to later-onset limb girdle muscular dystrophy (LGMD). Among all α-dystroglycanopathies, LGMD type 2I caused by FKRP mutations is most commonly seen in Europe but appears to be rare in Asia. We screened uncategorized 40 LGMD and 10 CMD patients by immunohistochemistry for α-DG and found 7 with reduced α-DG immunostaining. Immunoblotting with laminin overlay assay confirmed the impaired glycosylation of α-DG...
August 2013: Neuromuscular Disorders: NMD
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