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Congenital myopathy gene panel

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
Atsuko Nishikawa, Satomi Mitsuhashi, Naomasa Miyata, Ichizo Nishino
BACKGROUND: Inherited skeletal muscle diseases are genetically heterogeneous diseases caused by mutations in more than 150 genes. This has made it challenging to establish a high-throughput screening method for identifying causative gene mutations in clinical practice. AIM: In the present study, we developed a useful method for screening gene mutations associated with the pathogenesis of skeletal muscle diseases. METHODS: We established four target gene panels, each covering all exonic and flanking regions of genes involved in the pathogenesis of the following muscle diseases: (1) muscular dystrophy (MD), (2) congenital myopathy/congenital myasthenic syndrome, (3) metabolic myopathy and (4) myopathy with protein aggregations/rimmed vacuoles...
September 6, 2016: Journal of Medical Genetics
Zoran Gucev, Velibor Tasic, Dijana Plaseska-Karanfilska, Marina Krstevska Konstantinova, Ana Stamatova, Marija Dimishkovska, Nevenka Laban, Momir Polenakovic
LHX4 mutations are rare in combined pituitary hormone deficiency, and even rarer in isolated GHD. We describe a 14 years old boy who was referred for investigation of short stature. Convergent strabismus, nystagmus was present. At the age of 5 years his gait was unstable. A progressive myopathy ensued. Tests of pituitary reserve showed partial IGHD (8.2 ng/ml). Other pituitary hormones were within normal range. Muscle biopsy showed congenital myopathy of undefined etiology. MRI of the brain revealed the empty sella syndrome...
June 2016: Pediatric Endocrinology Reviews: PER
Kristýna Stehlíková, Daniela Skálová, Jana Zídková, Jana Haberlová, Stanislav Voháňka, Radim Mazanec, Lenka Mrázová, Petr Vondráček, Hana Ošlejšková, Josef Zámečník, Tomáš Honzík, Jiří Zeman, Martin Magner, Dana Šišková, Martina Langová, Vladimír Gregor, Marek Godava, Vratislav Smolka, Lenka Fajkusová
Inherited neuromuscular disorder (NMD) is a wide term covering different genetic disorders affecting muscles, nerves, and neuromuscular junctions. Genetic and clinical heterogeneity is the main drawback in a routine gene-by-gene diagnostics. We present Czech NMD patients with a genetic cause identified using targeted next-generation sequencing (NGS) and the spectrum of these causes. Overall 167 unrelated patients presenting NMD falling into categories of muscular dystrophies, congenital muscular dystrophies, congenital myopathies, distal myopathies, and other myopathies were tested by targeted NGS of 42 known NMD-related genes...
July 22, 2016: Clinical Genetics
Liu Yang, Ping Yu, Xiang Chen, Tao Cai
Nemaline myopathy (NM) constitutes a spectrum of primary skeletal muscle disorders, the diagnosis of which is based on muscle weakness and the visualization of nemaline bodies in muscle biopsies. Mutations in several NM causal genes have been attributed to the majority of NM cases, particularly mutations in nebulin and skeletal muscle α‑actin 1 (ACTA1), which are responsible for ~70% of cases; therefore, a genetic diagnostic strategy using targeted gene sequencing may potentially improve the diagnosis of suspected NM...
August 2016: Molecular Medicine Reports
Jaya Punetha, Akanchha Kesari, Eric P Hoffman, Monika Gos, Anna Kamińska, Anna Kostera-Pruszczyk, Irena Hausmanowa-Petrusewicz, Ying Hu, Yaqun Zou, Carsten G Bönnemann, Maria Jędrzejowska
INTRODUCTION: Mutations in the COL12A1 gene have been described in a milder Bethlem-like myopathy in 6 patients from 3 families (dominant missense), and in a severe congenital form with failure to attain ambulation in 2 patients in a single pedigree (recessive loss-of-function). METHODS: We describe an 8-year old girl of Polish origin who presented with profound hypotonia and joint hyperlaxity at birth after a pregnancy complicated by oligohydramnios and intrauterine growth retardation...
June 27, 2016: Muscle & Nerve
Hussein Daoud, Stephanie M Luco, Rui Li, Eric Bareke, Chandree Beaulieu, Olga Jarinova, Nancy Carson, Sarah M Nikkel, Gail E Graham, Julie Richer, Christine Armour, Dennis E Bulman, Pranesh Chakraborty, Michael Geraghty, Matthew A Lines, Thierry Lacaze-Masmonteil, Jacek Majewski, Kym M Boycott, David A Dyment
BACKGROUND: Rare diseases often present in the first days and weeks of life and may require complex management in the setting of a neonatal intensive care unit (NICU). Exhaustive consultations and traditional genetic or metabolic investigations are costly and often fail to arrive at a final diagnosis when no recognizable syndrome is suspected. For this pilot project, we assessed the feasibility of next-generation sequencing as a tool to improve the diagnosis of rare diseases in newborns in the NICU...
August 9, 2016: CMAJ: Canadian Medical Association Journal, Journal de L'Association Medicale Canadienne
Roula Ghaoui, Sandra T Cooper, Monkol Lek, Kristi Jones, Alastair Corbett, Stephen W Reddel, Merrilee Needham, Christina Liang, Leigh B Waddell, Garth Nicholson, Gina O'Grady, Simranpreet Kaur, Royston Ong, Mark Davis, Carolyn M Sue, Nigel G Laing, Kathryn N North, Daniel G MacArthur, Nigel F Clarke
IMPORTANCE: To our knowledge, the efficacy of transferring next-generation sequencing from a research setting to neuromuscular clinics has never been evaluated. OBJECTIVE: To translate whole-exome sequencing (WES) to clinical practice for the genetic diagnosis of a large cohort of patients with limb-girdle muscular dystrophy (LGMD) for whom protein-based analyses and targeted Sanger sequencing failed to identify the genetic cause of their disorder. DESIGN, SETTING, AND PARTICIPANTS: We performed WES on 60 families with LGMDs (100 exomes)...
December 2015: JAMA Neurology
Marie Maurer, Jérôme Mary, Laurent Guillaud, Marilyn Fender, Manuel Pelé, Thomas Bilzer, Natasha Olby, Jacques Penderis, G Diane Shelton, Jean-Jacques Panthier, Jean-Laurent Thibaud, Inès Barthélémy, Geneviève Aubin-Houzelstein, Stéphane Blot, Christophe Hitte, Laurent Tiret
Centronuclear myopathies (CNM) are inherited congenital disorders characterized by an excessive number of internalized nuclei. In humans, CNM results from ~70 mutations in three major genes from the myotubularin, dynamin and amphiphysin families. Analysis of animal models with altered expression of these genes revealed common defects in all forms of CNM, paving the way for unified pathogenic and therapeutic mechanisms. Despite these efforts, some CNM cases remain genetically unresolved. We previously identified an autosomal recessive form of CNM in French Labrador retrievers from an experimental pedigree, and showed that a loss-of-function mutation in the protein tyrosine phosphatase-like A (PTPLA) gene segregated with CNM...
2012: PloS One
Ernesto Pavoni, Francesca Sciandra, Giorgio Tasca, Roberta Tittarelli, Manuela Bozzi, Bruno Giardina, Enzo Ricci, Andrea Brancaccio
The dystroglycan (DG) expression pattern can be altered in severe muscular dystrophies. In fact, some congenital muscular dystrophies (CMDs) and limb-girdle muscular dystrophies (LGMDs) are caused by point mutations identified in six glycosyltransferase genes which are likely to target different steps along the posttranslational "O-glycosylation route" leading to a fully decorated and functional α-DG subunit. Indeed, hypoglycosylation of α-DG is thought to represent a major pathological event, in that it could reduce the DG's ability to bind the basement membrane components, thus leading to sarcolemmal instability and necrosis...
2011: Open Neurology Journal
Alan H Beggs, Johann Böhm, Elizabeth Snead, Marek Kozlowski, Marie Maurer, Katie Minor, Martin K Childers, Susan M Taylor, Christophe Hitte, James R Mickelson, Ling T Guo, Andrew P Mizisin, Anna Buj-Bello, Laurent Tiret, Jocelyn Laporte, G Diane Shelton
Mutations in the MTM1 gene encoding myotubularin cause X-linked myotubular myopathy (XLMTM), a well-defined subtype of human centronuclear myopathy. Seven male Labrador Retrievers, age 14-26 wk, were clinically evaluated for generalized weakness and muscle atrophy. Muscle biopsies showed variability in fiber size, centrally placed nuclei resembling fetal myotubes, and subsarcolemmal ringed and central dense areas highlighted with mitochondrial specific reactions. Ultrastructural studies confirmed the centrally located nuclei, abnormal perinuclear structure, and mitochondrial accumulations...
August 17, 2010: Proceedings of the National Academy of Sciences of the United States of America
Nicole Monnier, Isabelle Marty, Julien Faure, Claudia Castiglioni, Claude Desnuelle, Sabrina Sacconi, Brigitte Estournet, Ana Ferreiro, Norma Romero, Annie Laquerriere, Leila Lazaro, Jean-Jacques Martin, Eva Morava, Annick Rossi, Anneke Van der Kooi, Marianne de Visser, Corien Verschuuren, Joël Lunardi
Mutations of the ryanodine receptor cause dominant and recessive forms of congenital myopathies with cores. Quantitative defects of RYR1 have been reported in families presenting with recessive forms of the disease and epigenic regulation has been recently proposed to explain potential maternal monoallelic silencing of the RYR1 gene. We investigated nine families presenting with a recessive form of the disease and showing a quantitative defect of RYR1 expression. Genetic analysis allowed the identification of a mutation on both alleles of the RYR1 gene for all patients, 15 being novel variants...
May 2008: Human Mutation
Yoshitatsu Sei, Nyamkhishig N Sambuughin, Edward J Davis, Daniel Sachs, Phil B Cuenca, Barbara W Brandom, Timothy Tautz, Henry Rosenberg, Thomas E Nelson, Sheila M Muldoon
BACKGROUND: Malignant hyperthermia (MH) is a pharmacogenetic disorder of skeletal muscle, manifested as a life-threatening hypermetabolic crisis after exposure to anesthetics. Type I ryanodine receptor 1 is the primary gene responsible for susceptibility to MH as well as central core disease, a congenital myopathy that predisposes susceptibility to MH. More than 40 mutations in the RyR1 gene cluster in three coding regions: the N-terminus, central, and C-terminus regions. However, the frequency of mutations in each region has not been studied in the North American MH-susceptible population...
October 2004: Anesthesiology
Christopher M Gomez, Ricardo A Maselli, Jason Groshong, Roberto Zayas, Robert L Wollmann, Thierry Cens, Pierre Charnet
Mutations affecting the gating and channel properties of ionotropic neurotransmitter receptors in some hereditary epilepsies, in familial hyperekplexia, and the slow-channel congenital myasthenic syndrome (SCCMS) may perturb the kinetics of synaptic currents, leading to significant clinical consequences. Although at least 12 acetylcholine receptor (AChR) mutations have been identified in the SCCMS, the altered channel properties critical for disease pathogenesis in the SCCMS have not been identified. To approach this question, we investigated the effect of different AChR subunit mutations on muscle weakness and the function and viability of neuromuscular synapses in transgenic mice...
August 1, 2002: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
N Monnier, N B Romero, J Lerale, P Landrieu, Y Nivoche, M Fardeau, J Lunardi
Central core disease (CCD) is an autosomal dominant congenital myopathy. Diagnosis is based on the presence of cores in skeletal muscles. CCD has been linked to the gene encoding the ryanodine receptor (RYR1) and is considered to be an allelic disease of malignant hyperthermia susceptibility. However, the report of a recessive form of transmission together with a variable clinical presentation has raised the question of the genetic heterogeneity of the disease. Analyzing a panel of 34 families exclusively recruited on the basis of both clinically and morphologically expressed CCD, 12 different mutations of the C-terminal domain of RYR1 have been identified in 16 unrelated families...
October 15, 2001: Human Molecular Genetics
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