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S T Oestergaard, T Stojkovic, J R Dahlqvist, C Bouchet-Seraphin, J Nectoux, F Leturcq, M Cossée, G Solé, C Thomsen, T O Krag, J Vissing
OBJECTIVE: In this study, muscle involvement assessed by MRI and levels of GMPPB and glycosylation of α-dystroglycan expression in muscle were examined in patients with limb-girdle muscular dystrophy (LGMD) type 2T. METHODS: Six new patients with genetically verified mutations in GMPPB were studied. T1-weighted magnetic resonance images were obtained in 4 participants. Muscle strength and potential involvement of extramuscular organs were examined. Glycosylation of α-dystroglycan in muscle was studied, and GMPPB and α-dystroglycan expression was analyzed by Western blotting...
December 2016: Neurology. Genetics
Hemakumar M Reddy, Kyung-Ah Cho, Monkol Lek, Elicia Estrella, Elise Valkanas, Michael D Jones, Satomi Mitsuhashi, Basil T Darras, Anthony A Amato, Hart Gw Lidov, Catherine A Brownstein, David M Margulies, Timothy W Yu, Mustafa A Salih, Louis M Kunkel, Daniel G MacArthur, Peter B Kang
The current study characterizes a cohort of limb-girdle muscular dystrophy (LGMD) in the United States using whole-exome sequencing. Fifty-five families affected by LGMD were recruited using an institutionally approved protocol. Exome sequencing was performed on probands and selected parental samples. Pathogenic mutations and cosegregation patterns were confirmed by Sanger sequencing. Twenty-two families (40%) had novel and previously reported pathogenic mutations, primarily in LGMD genes, and also in genes for Duchenne muscular dystrophy, facioscapulohumeral muscular dystrophy, congenital myopathy, myofibrillar myopathy, inclusion body myopathy and Pompe disease...
October 6, 2016: Journal of Human Genetics
Dorota Monies, Hindi N Alhindi, Mohamed A Almuhaizea, Mohamed Abouelhoda, Anas M Alazami, Ewa Goljan, Banan Alyounes, Dyala Jaroudi, Abdulelah AlIssa, Khalid Alabdulrahman, Shazia Subhani, Mohamed El-Kalioby, Tariq Faquih, Salma M Wakil, Nada A Altassan, Brian F Meyer, Saeed Bohlega
BACKGROUND: Fifty random genetically unstudied families (limb-girdle muscular dystrophy (LGMD)/myopathy) were screened with a gene panel incorporating 759 OMIM genes associated with neurological disorders. Average coverage of the CDS and 10 bp flanking regions of genes was 99 %. All families were referred to the Neurosciences Clinic of King Faisal Specialist Hospital and Research Centre, Saudi Arabia. Patients presented with muscle weakness affecting the pelvic and shoulder girdle. Muscle biopsy in all cases showed dystrophic or myopathic changes...
September 27, 2016: Human Genomics
M Aguennouz, C Lo Giudice, N Licata, C Rodolico, O Musumeci, M Fanin, A Migliorato, M Ragusa, V Macaione, R M Di Giorgio, C Angelini, A Toscano
miRNA expression profile and predicted pathways involved in selected limb-girdle muscular dystrophy (LGMD)2A/2B patients were investigated. A total of 187 miRNAs were dysregulated in all patients, with six miRNAs showing opposite regulation in LGMD2A versus LGMD2B patients. Silico analysis evidence: (1) a cluster of the dysregulated miRNAs resulted primarily involved in inflammation and calcium metabolism, and (2) two genes predicted as controlled by calcium-assigned miRNAs (Vitamin D Receptor gene and Guanine Nucleotide Binding protein beta polypeptide 1gene) showed an evident upregulation in LGMD2B patients, in accordance with miRNA levels...
August 2016: Cell Biochemistry and Function
Matthew P Wicklund
The limb-girdle muscular dystrophies (LGMDs) encompass a collection of genetic muscle diseases with proximal-predominant weakness of the limbs. Thirty-two of these disorders are named via the common nomenclature, including 8 autosomal-dominant (LGMD1A-H) and 24 autosomal-recessive (LGMD2A-X) disorders.(1) In addition, numerous other genetic muscle diseases, including Bethlem myopathy, dystrophinopathies, ryanodine receptor-associated myopathies, and many more, may clinically present with similar proximal-predominant weakness...
August 2016: Neurology. Genetics
John Vissing
PURPOSE OF REVIEW: The aim of the study was to describe the clinical spectrum of limb girdle muscular dystrophies (LGMDs), the pitfalls of the current classification system for LGMDs, and emerging therapies for these conditions. RECENT FINDINGS: Close to half of all LGMD subtypes have been discovered within the last 6 years of the 21-year-period in which the current classification system for LGMD has existed. The number of letters for annotation of new recessive LGMD conditions is exhausted, and multiple already classified LGMDs do not strictly fulfill diagnostic criteria for LGMD or are registered in other classification systems for muscle disease...
October 2016: Current Opinion in Neurology
Roula Ghaoui, Tatiana Benavides, Monkol Lek, Leigh B Waddell, Simranpreet Kaur, Kathryn N North, Daniel G MacArthur, Nigel F Clarke, Sandra T Cooper
TorsinA-interacting protein 1 (TOR1AIP1) gene is a novel gene that has recently been described to cause limb-girdle muscular dystrophy (LGMD) with mild dilated cardiomyopathy. We report a family with mutations in TOR1AIP1 where the striking clinical feature is severe cardiac failure requiring cardiac transplant in two siblings, in addition to musculoskeletal weakness and muscular dystrophy. We demonstrate an absence of TOR1AIP1 protein expression in cardiac and skeletal muscles of affected siblings. We expand the phenotype of this gene to demonstrate the cardiac involvement and the importance of cardiac surveillance in patients with mutations in TOR1AIP1...
August 2016: Neuromuscular Disorders: NMD
Jasmine M Yakubowski, Glyn A McMillan, John R Gray
Stimulus complexity affects the response of looming sensitive neurons in a variety of animal taxa. The Lobula Giant Movement Detector/Descending Contralateral Movement Detector (LGMD/DCMD) pathway is well-characterized in the locust visual system. It responds to simple objects approaching on a direct collision course (i.e., looming) as well as complex motion defined by changes in stimulus velocity, trajectory, and transitions, all of which are affected by the presence or absence of background visual motion...
May 2016: Physiological Reports
Roberta Petillo, Paola D'Ambrosio, Annalaura Torella, Antonella Taglia, Esther Picillo, Alessandro Testori, Manuela Ergoli, Gerardo Nigro, Giulio Piluso, Vincenzo Nigro, Luisa Politano
Mutations in the lamin A/C gene (LMNA) have been associated with several phenotypes ranging from systemic to prevalent of muscle, heart, skin, nerve etc. More recently they have been associated with dilated cardiomyopathy (DCM) and severe forms of arrhythmogenic right ventricular cardiomyopathy (ARVC). We report four novel mutations - 3 missense and 1 deletion - in 4 unrelated patients showing different phenotypes, ranging from the early onset congenital form of laminopathy to classical LGMD phenotype, to LGMD and heart involvement...
December 2015: Acta Myologica: Myopathies and Cardiomyopathies: Official Journal of the Mediterranean Society of Myology
Francesca Magri, Vincenzo Nigro, Corrado Angelini, Tiziana Mongini, Marina Mora, Isabella Moroni, Antonio Toscano, Maria Grazia D'Angelo, Giuliano Tomelleri, Gabriele Siciliano, Giulia Ricci, Claudio Bruno, Stefania Corti, Olimpia Musumeci, Giorgio Tasca, Enzo Ricci, Mauro Monforte, Monica Sciacco, Chiara Fiorillo, Sandra Gandossini, Carlo Minetti, Lucia Morandi, Marco Savarese, Giuseppina Di Fruscio, Claudio Semplicini, Elena Pegoraro, Alessandra Govoni, Roberta Brusa, Roberto Del Bo, Dario Ronchi, Maurizio Moggio, Nereo Bresolin, Giacomo Pietro Comi
: Introduction Limb girdle muscular dystrophies (LGMDs) are characterized by high molecular heterogeneity, clinical overlap, and a paucity of specific biomarkers. However, their molecular definition is fundamental for prognostic and therapeutic purposes. Methods We created an Italian LGMD registry that included 370 molecularly defined patients. We reviewed detailed retrospective and prospective data and compared each LGMD subtype for differential diagnosis purposes. Results LGMD2A and 2B are the most frequent forms in Italy...
May 17, 2016: Muscle & Nerve
Abdallah Fayssoil, Adam Ogna, Cendrine Chaffaut, Sylvie Chevret, Raquel Guimarães-Costa, France Leturcq, Karim Wahbi, Helene Prigent, Frederic Lofaso, Olivier Nardi, Bernard Clair, Anthony Behin, Tanya Stojkovic, Pascal Laforet, David Orlikowski, Djillali Annane
BACKGROUND: Type 2C and 2D limb girdle muscular dystrophies (LGMD) are a group of autosomal recessive limb girdle muscular dystrophies manifested by proximal myopathy, impaired respiratory muscle function and cardiomyopathy. The correlation and the prognostic impact of respiratory and heart impairment are poorly described. We aimed to describe the long-term cardiac and respiratory follow-up of these patients and to determine predictive factors of cardio-respiratory events and mortality in LGMD 2C and 2D...
2016: PloS One
Corrado I Angelini
In this issue of Neurology® Genetics, Endo et al.(1) report 3 cases of limb-girdle muscular dystrophy (LGMD) phenotype with mental retardation or hyperCKemia found by next-generation sequencing (NGS) to have a variant in the POMGNT2 gene, which has so far been recognized only as causing congenital muscular dystrophy (CMD).
December 2015: Neurology. Genetics
Yukari Endo, Mingrui Dong, Satoru Noguchi, Megumu Ogawa, Yukiko K Hayashi, Satoshi Kuru, Kenji Sugiyama, Shigehiro Nagai, Shiro Ozasa, Ikuya Nonaka, Ichizo Nishino
OBJECTIVE: To determine the genetic variants in patients with dystroglycanopathy (DGP) and assess the pathogenicity of these variants. METHODS: A total of 20 patients with DGP were identified by immunohistochemistry or Western blot analysis. Whole-exome sequencing (WES) was performed using patient samples. The pathogenicity of the variants identified was evaluated on the basis of the phenotypic recovery in a knockout (KO) haploid human cell line by transfection with mutated POMGNT2 cDNA and on the basis of the in vitro enzymatic activity of mutated proteins...
December 2015: Neurology. Genetics
Rachel Thompson, Volker Straub
The limb-girdle muscular dystrophies (LGMDs) are a diverse group of genetic neuromuscular conditions that usually manifest in the proximal muscles of the hip and shoulder girdles. Since the identification of the first gene associated with the phenotype in 1994, an extensive body of research has identified the genetic defects responsible for over 30 LGMD subtypes, revealed an increasingly varied phenotypic spectrum, and exposed the need to move towards a systems-based understanding of the molecular pathways affected...
May 2016: Nature Reviews. Neurology
Satish V Khadilkar, Chetan R Chaudhari, Rashna S Dastur, Pradnya S Gaitonde, Jayendra G Yadav
BACKGROUND AND PURPOSE: Diagnostic evaluation of limb-girdle muscular dystrophy type 2A (LGMD2A) involves specialized studies on muscle biopsy and mutation analysis. Mutation screening is the gold standard for diagnosis but is difficult as the gene is large and multiple mutations are known. This study evaluates the utility of two known founder mutations as a first-line diagnostic test for LGMD2A in the Agarwals. MATERIALS AND METHODS: The Agarwals with limb-girdle muscular dystrophy (LGMD) phenotype were analyzed for two founder alleles (intron 18/exon 19 c...
January 2016: Annals of Indian Academy of Neurology
Ying Zhu, Fabrizio Gabbiani
Individual neurons in several sensory systems receive synaptic inputs organized according to subcellular topographic maps, yet the fine structure of this topographic organization and its relation to dendritic morphology have not been studied in detail. Subcellular topography is expected to play a role in dendritic integration, particularly when dendrites are extended and active. The lobula giant movement detector (LGMD) neuron in the locust visual system is known to receive topographic excitatory inputs on part of its dendritic tree...
June 1, 2016: Journal of Neurophysiology
Wen-Chen Liang, Po-Ching Chou, Chia-Cheng Hung, Yi-Ning Su, Tsu-Min Kan, Wan-Zi Chen, Yukiko K Hayashi, Ichizo Nishino, Yuh-Jyh Jong
Limb-girdle muscular dystrophy type 2D (LGMD2D), an autosomal-recessive inherited LGMD, is caused by the mutations in SGCA. SGCA encodes alpha-sarcoglycan (SG) that forms a heterotetramer with other SGs in the sarcolemma, and comprises part of the dystrophin-glycoprotein complex. The frequency of LGMD2D is variable among different ethnic backgrounds, and so far only a few patients have been reported in Asia. We identified five patients with a novel homozygous mutation of c.101G>T (p.Arg34Leu) in SGCA from a big aboriginal family ethnically consisting of two tribes in Taiwan...
March 15, 2016: Journal of the Neurological Sciences
Hemakumar M Reddy, Sherifa A Hamed, Monkol Lek, Satomi Mitsuhashi, Elicia Estrella, Michael D Jones, Lane J Mahoney, Anna R Duncan, Kyung-Ah Cho, Daniel G Macarthur, Louis M Kunkel, Peter B Kang
INTRODUCTION: The genetic causes of limb-girdle muscular dystrophy (LGMD) have been studied in numerous countries, but such investigations have been limited in Egypt. METHODS: A cohort of 30 families with suspected LGMD from Assiut, Egypt, was studied using immunohistochemistry, homozygosity mapping, Sanger sequencing, and whole exome sequencing. RESULTS: Six families were confirmed to have pathogenic mutations, 4 in SGCA and 2 in DMD. Of these, 3 families harbored a single nonsense mutation in SGCA, suggesting that this may be a common mutation in Assiut, Egypt, originating from a founder effect...
October 2016: Muscle & Nerve
Niraj Kumar Srivastava, Sanjay Annarao, Neeraj Sinha
AIMS: Proton Nuclear Magnetic Resonance (NMR) based metabolomics analysis is extensively used to explore the metabolic profiling of biofluids. This approach was used for the analysis of metabolites in serum of patients with major types of muscular dystrophy in early phase of the disease. MATERIAL AND METHODS: Proton NMR spectroscopy based qualitative (assignment of metabolites) and quantitative (quantification of metabolites) analysis of metabolites in native serum of patients with Duchenne muscular dystrophy (DMD) [n=88; n represent the number], Becker muscular dystrophy (BMD) [n=40], facioscapulohumeral dystrophy (FSHD) [n=22], limb girdle muscular dystrophy (LGMD)-2B [n=35] and myotonic dystrophy (DM) [n=21] as compared to normal subjects [n=50] were performed...
April 15, 2016: Life Sciences
Stefan Wernitznig, Mariella Sele, Martin Urschler, Armin Zankel, Peter Pölt, F Claire Rind, Gerd Leitinger
BACKGROUND: Elucidating the anatomy of neuronal circuits and localizing the synaptic connections between neurons, can give us important insights in how the neuronal circuits work. We are using serial block-face scanning electron microscopy (SBEM) to investigate the anatomy of a collision detection circuit including the Lobula Giant Movement Detector (LGMD) neuron in the locust, Locusta migratoria. For this, thousands of serial electron micrographs are produced that allow us to trace the neuronal branching pattern...
May 1, 2016: Journal of Neuroscience Methods
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