المؤلفون: Inès Mademan, Lauren E. Drake, James Shorter, Kevin J. O'Donovan, Alice Flynn Ford, Andrzej Kochański, Matthew T. Wheeler, Kristof Van Schil, Nicolas Dubuisson, Richard J.L.F. Lemmers, Silvère M. van der Maarel, Jonathan Baets, Devon Bonner, J. Paul Taylor, Peter De Jonghe, Tine Deconinck, Jacinda B. Sampson, Charlotte M. Fare, Anahit Mehrabyan, Peter Van den Bergh, Nicol C. Voermans, Dagmara Kabzińska, Lin Guo, Steven Palmer, Danique Beijer, Hong Joo Kim

المساهمون: UCL - (SLuc) Service de neurologie, UCL - SSS/IREC/EDIN - Pôle d'endocrinologie, diabète et nutrition, UCL - (SLuc) Centre de référence neuromusculaire

المصدر: Jci Insight, 6, 14
JCI Insight, 6(14). AMER SOC CLINICAL INVESTIGATION INC
JCI Insight
JCI insight, Vol. 6, no.14, p. 1-18 (2021)
Jci Insight, 6
JCI insight

مصطلحات موضوعية: Adult, Male, Heterozygote, TIA1, Heterogeneous nuclear ribonucleoprotein, Adolescent, Heterogeneous Nuclear Ribonucleoprotein A1, DNA Mutational Analysis, Biology, Whole Exome Sequencing, Muscular Atrophy, Spinal, Young Adult, Stress granule, All institutes and research themes of the Radboud University Medical Center, Exome Sequencing, medicine, Genetics, Humans, Amyotrophic lateral sclerosis, Child, Genetic Association Studies, Amyotrophic Lateral Sclerosis, RNA, Translation (biology), General Medicine, Middle Aged, medicine.disease, Cell stress, Disorders of movement Donders Center for Medical Neuroscience [Radboudumc 3], Phenotype, Stress Granules, Cell biology, Pedigree, Chemistry, RNA splicing, Mutation, Female, Human medicine, Neurological disorders, Research Article, Neuroscience

الوصف: Mutations in HNRNPA1 encoding heterogeneous nuclear ribonucleoprotein (hnRNP) A1 are a rare cause of amyotrophic lateral sclerosis (ALS) and multisystem proteinopathy (MSP). hnRNPA1 is part of the group of RNA-binding proteins (RBPs) that assemble with RNA to form RNPs. hnRNPs are concentrated in the nucleus and function in pre-mRNA splicing, mRNA stability, and the regulation of transcription and translation. During stress, hnRNPs, mRNA, and other RBPs condense in the cytoplasm to form stress granules (SGs). SGs are implicated in the pathogenesis of (neuro-)degenerative diseases, including ALS and inclusion body myopathy (IBM). Mutations in RBPs that affect SG biology, including FUS, TDP-43, hnRNPA1, hnRNPA2B1, and TIA1, underlie ALS, IBM, and other neurodegenerative diseases. Here, we characterize 4 potentially novel HNRNPA1 mutations (yielding 3 protein variants: *321Eext*6, *321Qext*6, and G304Nfs*3) and 2 known HNRNPA1 mutations (P288A and D262V), previously connected to ALS and MSP, in a broad spectrum of patients with hereditary motor neuropathy, ALS, and myopathy. We establish that the mutations can have different effects on hnRNPA1 fibrillization, liquid-liquid phase separation, and SG dynamics. P288A accelerated fibrillization and decelerated SG disassembly, whereas *321Eext*6 had no effect on fibrillization but decelerated SG disassembly. By contrast, G304Nfs*3 decelerated fibrillization and impaired liquid phase separation. Our findings suggest different underlying pathomechanisms for HNRNPA1 mutations with a possible link to clinical phenotypes.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f44f7da41fba7d5d08ec3934beb42a6Test
https://hdl.handle.net/1887/3214438Test

المؤلفون: Shirin Jamal-Omidi, L. Phillips, Anna Kostera-Pruszczyk, Nanna Witting, Miren Zulaica Ijurco, Maja von der Hagen, Ana Töpf, Kristl G. Claeys, Jaume Colomer, Monkol Lek, Shahriar Nafissi, L. Xu, Daniel G. MacArthur, Elise Valkanas, Jonathan Baets, Anna Potulska-Chromik, Volker Straub, Anna Łusakowska, Peter Van den Bergh, Sonja Strang-Karlsson, Thomas E. Mullen, John Vissing, Marta Bertoli, Juan Bautista Espinal Valencia, Carina Wallgren-Pettersson, Willem De Ridder, Hacer Durmus, Tracey Willis, Katherine Johnson, Andreas Hahn, Roberto Fernández-Torrón, Nicolas Deconinck

المساهمون: UCL - (SLuc) Service de neurologie, UCL - SSS/IONS/NEUR - Clinical Neuroscience, Medicum, Department of Medical and Clinical Genetics, University of Helsinki, Clinicum, Children's Hospital, HUS Children and Adolescents

المصدر: Skeletal Muscle, Vol. 8, no. 1, p. 23 [1-12] (2018)
Skeletal muscle 8(1), 23 (2018). doi:10.1186/s13395-018-0170-1
Skeletal Muscle
Johnson, K, Bertoli, M, Phillips, L, Töpf, A, Van den Bergh, P, Vissing, J, Witting, N, Nafissi, S, Jamal-Omidi, S, Łusakowska, A, Kostera-Pruszczyk, A, Potulska-Chromik, A, Deconinck, N, Wallgren-Pettersson, C, Strang-Karlsson, S, Colomer, J, Claeys, K G, De Ridder, W, Baets, J, von der Hagen, M, Fernández-Torrón, R, Zulaica Ijurco, M, Espinal Valencia, J B, Hahn, A, Durmus, H, Willis, T, Xu, L, Valkanas, E, Mullen, T E, Lek, M, MacArthur, D G & Straub, V 2018, ' Detection of variants in dystroglycanopathy-associated genes through the application of targeted whole-exome sequencing analysis to a large cohort of patients with unexplained limb-girdle muscle weakness ', Skeletal Muscle, vol. 8, 23 . https://doi.org/10.1186/s13395-018-0170-1Test
SKELET MUSCLE
r-FSJD. Repositorio Institucional de Producción Científica de la Fundació Sant Joan de Déu
instname
Skeletal Muscle, 8 (1
r-FSJD: Repositorio Institucional de Producción Científica de la Fundació Sant Joan de Déu
Fundació Sant Joan de Déu
Skeletal Muscle, Vol 8, Iss 1, Pp 1-12 (2018)
Skeletal muscle

مصطلحات موضوعية: 0301 basic medicine, Male, lcsh:Diseases of the musculoskeletal system, Glycosylation, Whole Exome Sequencing/methods, Muscle Proteins, Hygiène et médecine sportives, Bioinformatics, WALKER-WARBURG-SYNDROME, 0302 clinical medicine, Orthopedics and Sports Medicine, Limb-girdle muscle weakness, Child, Dystroglycans, Exome sequencing, Muscle Proteins/genetics, Aged, 80 and over, Homozygote, Middle Aged, Dystroglycanopathies, 3. Good health, Whole-exome sequencing, medicine.anatomical_structure, Phenotype, Dystroglycans/metabolism, Child, Preschool, Orthopédie, Congenital muscular dystrophy, SKELETAL-MUSCLE, Female, medicine.symptom, GLYCOPROTEIN COMPLEX, Life Sciences & Biomedicine, ALPHA-DYSTROGLYCAN, Adult, Heterozygote, Proximal muscle weakness, Adolescent, EYE-BRAIN DISEASE, 03 medical and health sciences, Young Adult, Glycoprotein complex, Exome Sequencing, medicine, Humans, ABNORMAL GLYCOSYLATION, Genetic Predisposition to Disease, Walker–Warburg syndrome, Biology, Molecular Biology, POMT2 MUTATIONS, Aged, Science & Technology, Genetic heterogeneity, business.industry, Research, Muscular Dystrophies, Limb-Girdle/genetics, Muscle weakness, Skeletal muscle, Genetic Variation, Cell Biology, medicine.disease, Cancérologie, 030104 developmental biology, Muscular Dystrophies, Limb-Girdle, Mutation, CONGENITAL MUSCULAR-DYSTROPHY, 1182 Biochemistry, cell and molecular biology, Biologie cellulaire, Human medicine, DEFECTIVE GLYCOSYLATION, 3111 Biomedicine, lcsh:RC925-935, business, 030217 neurology & neurosurgery, MENTAL-RETARDATION

الوصف: Background: Dystroglycanopathies are a clinically and genetically heterogeneous group of disorders that are typically characterised by limb-girdle muscle weakness. Mutations in 18 different genes have been associated with dystroglycanopathies, the encoded proteins of which typically modulate the binding of α-dystroglycan to extracellular matrix ligands by altering its glycosylation. This results in a disruption of the structural integrity of the myocyte, ultimately leading to muscle degeneration. Methods: Deep phenotypic information was gathered using the PhenoTips online software for 1001 patients with unexplained limb-girdle muscle weakness from 43 different centres across 21 European and Middle Eastern countries. Whole-exome sequencing with at least 250ng DNA was completed using an Illumina exome capture and a 38Mb baited target. Genes known to be associated with dystroglycanopathies were analysed for disease-causing variants. Results: Suspected pathogenic variants were detected in DPM3, ISPD, POMT1 and FKTN in one patient each, in POMK in two patients, in GMPPB in three patients, in FKRP in eight patients and in POMT2 in ten patients. This indicated a frequency of 2.7% for the disease group within the cohort of 1001 patients with unexplained limb-girdle muscle weakness. The phenotypes of the 27 patients were highly variable, yet with a fundamental presentation of proximal muscle weakness and elevated serum creatine kinase. Conclusions: Overall, we have identified 27 patients with suspected pathogenic variants in dystroglycanopathy-associated genes. We present evidence for the genetic and phenotypic diversity of the dystroglycanopathies as a disease group, while also highlighting the advantage of incorporating next-generation sequencing into the diagnostic pathway of rare diseases.
SCOPUS: ar.j
info:eu-repo/semantics/published

وصف الملف: application/pdf; Electronic; 1 full-text file(s): application/pdf; pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed866fead030563b4d9ea59130e00061Test
https://hdl.handle.net/2078.1/220057Test

المؤلفون: Radim Mazanec, Luciano Merlini, Eva Nelis, Peter Van den Bergh, Anne-Marie Jacobs, Andrzej Kochański, Joy Irobi, Vincent Timmerman, Dirk Fischer, Jonathan Baets, Wim Robberecht, Tine Deconinck, Albena Jordanova, Pavel Seeman, Els De Vriendt, Raul Juntas Morales, Michaela Auer-Grumbach, Zoran Mitrović, John H. J. Wokke, Ines Dierick, Vedrana Milic Rasic, A. T. J. M. Helderman-van den Enden, Peter De Jonghe

المصدر: Brain

مصطلحات موضوعية: Male, Genotype, HSP27 Heat-Shock Proteins, Mutation, Missense, Biology, Protein Serine-Threonine Kinases, medicine.disease_cause, 03 medical and health sciences, 0302 clinical medicine, GTP-Binding Protein gamma Subunits, medicine, Missense mutation, Humans, Heat-Shock Proteins, 030304 developmental biology, Genetics, 0303 health sciences, Mutation, Base Sequence, Genetic heterogeneity, Mosaicism, Chromosomes, Human, Pair 11, Haplotype, DNA Helicases, Spinal muscular atrophy, VAPB, medicine.disease, Multifunctional Enzymes, 3. Good health, Neoplasm Proteins, Pedigree, DCTN1, Electrophysiology, Phenotype, Haplotypes, Female, Neurology (clinical), Hereditary Sensory and Motor Neuropathy, 030217 neurology & neurosurgery, RNA Helicases, Molecular Chaperones, Distal HMN, BSCL2, HSPB1, HSPB8, SETX, Marie-Tooth-disease, amyotrophic-lateral-sclerosis, spinal muscular-atrophy, SEIP congenital lipodystrophy, familial spastic paraplegia, RNA synthetase mutations, sensory neuron diseases, HMN type-V, Silver-syndrome, electrophysiologic findings

الوصف: Distal hereditary motor neuropathy (HMN) is a clinically and genetically heterogeneous group of disorders affecting spinal alpha-motor neurons. Since 2001, mutations in six different genes have been identified for autosomal dominant distal HMN ; glycyl-tRNA synthetase (GARS), dynactin 1 (DCTN1), small heat shock 27 kDa protein 1 (HSPB1), small heat shock 22 kDa protein 8 (HSPB8), Berardinelli-Seip congenital lipodystrophy (BSCL2) and senataxin (SETX). In addition a mutation in the (VAMP)-associated protein B and C (VAPB) was found in several Brazilian families with complex and atypical forms of autosomal dominantly inherited motor neuron disease. We have investigated the distribution of mutations in these seven genes in a cohort of 112 familial and isolated patients with a diagnosis of distal motor neuropathy and found nine different disease-causing mutations in HSPB8, HSPB1, BSCL2 and SETX in 17 patients of whom 10 have been previously reported. No mutations were found in GARS, DCTN1 and VAPB. The phenotypic features of patients with mutations in HSPB8, HSPB1, BSCL2 and SETX fit within the distal HMN classification, with only one exception ; a C-terminal HSPB1-mutation was associated with upper motor neuron signs. Furthermore, we provide evidence for a genetic mosaicism in transmitting an HSPB1 mutation. This study, performed in a large cohort of familial and isolated distal HMN patients, clearly confirms the genetic and phenotypic heterogeneity of distal HMN and provides a basis for the development of algorithms for diagnostic mutation screening in this group of disorders.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6e645225795d20a3d550af3d87b80dfTest
http://doc.rero.ch/record/299093/files/awn029.pdfTest

المؤلفون: Peter Van den Bergh, Sabrina Sacconi, Andreas Ferbert, Matthias Vorgerd, Markus Bergmann, Jörg B. Schulz, Joachim Weis, Jean-Jacques Martin, Marcus Deschauer, J Elisa Bach, Peter De Jonghe, Jan Bürmann, Wolfram Kress, Kristl G. Claeys, Eva Neuen-Jacob, J. Michael Schröder, Anna-Lena Semmler, Rudolf A. Kley, Claus Liebe, Roland Anderheiden, Oliver J. Müller

المساهمون: Institut de Biologie Valrose (IBV), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie

المصدر: Orphanet Journal of Rare Diseases
Orphanet Journal of Rare Diseases, BioMed Central, 2014, 9 (1), pp.121
Orphanet Journal of Rare Diseases, Vol. 9, p. 121 [1-13] (2014)
Orphanet journal of rare diseases 9(1), 121 (2014). doi:10.1186/s13023-014-0121-9
Orphanet journal of rare diseases
Orphanet journal of rare diseases 9, 121 (2014). doi:10.1186/s13023-014-0121-9

مصطلحات موضوعية: Male, Pathology, bcl-2 associated athanogene protein 3, 610 Medical sciences Medicine, 0302 clinical medicine, Genetics(clinical), Pharmacology (medical), FLNC, [SDV.BDD]Life Sciences [q-bio]/Development Biology, Genetics (clinical), Genetics, Medicine(all), 0303 health sciences, medicine.diagnostic_test, High-Throughput Nucleotide Sequencing, General Medicine, Middle Aged, Phenotype, Pedigree, 3. Good health, Mutation (genetic algorithm), Female, Protein aggregation, Polyneuropathy, Myopathies, Structural, Congenital, Adult, medicine.medical_specialty, Adolescent, Next generation sequencing, Biology, MFM, Hearing impairment, Young Adult, 03 medical and health sciences, medicine, Humans, ddc:610, Muscle, Skeletal, Gene, Adaptor Proteins, Signal Transducing, Aged, 030304 developmental biology, Nerve biopsy, Genetic heterogeneity, Research, medicine.disease, Human genetics, Mutation, Human medicine, Apoptosis Regulatory Proteins, 030217 neurology & neurosurgery

الوصف: Background Myofibrillar myopathies (MFM) are a group of phenotypically and genetically heterogeneous neuromuscular disorders, which are characterized by protein aggregations in muscle fibres and can be associated with multisystemic involvement. Methods We screened a large cohort of 38 index patients with MFM for mutations in the nine thus far known causative genes using Sanger and next generation sequencing (NGS). We studied the clinical and histopathological characteristics in 38 index patients and five additional relatives (n = 43) and particularly focused on the associated multisystemic symptoms. Results We identified 14 heterozygous mutations (diagnostic yield of 37%), among them the novel p.Pro209Gln mutation in the BAG3 gene, which was associated with onset in adulthood, a mild phenotype and an axonal sensorimotor polyneuropathy, in the absence of giant axons at the nerve biopsy. We revealed several novel clinical phenotypes and unusual multisystemic presentations with previously described mutations: hearing impairment with a FLNC mutation, dysphonia with a mutation in DES and the first patient with a FLNC mutation presenting respiratory insufficiency as the initial symptom. Moreover, we described for the first time respiratory insufficiency occurring in a patient with the p.Gly154Ser mutation in CRYAB. Interestingly, we detected a polyneuropathy in 28% of the MFM patients, including a BAG3 and a MYOT case, and hearing impairment in 13%, including one patient with a FLNC mutation and two with mutations in the DES gene. In four index patients with a mutation in one of the MFM genes, typical histological findings were only identified at the ultrastructural level (29%). Conclusions We conclude that extraskeletal symptoms frequently occur in MFM, particularly cardiac and respiratory involvement, polyneuropathy and/or deafness. BAG3 mutations should be considered even in cases with a mild phenotype or an adult onset. We identified a genetic defect in one of the known genes in less than half of the MFM patients, indicating that more causative genes are still to be found. Next generation sequencing techniques should be helpful in achieving this aim.

وصف الملف: application/pdf; pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb47c88657f1d9f8b9fc70a4ba9888e7Test
https://hal.archives-ouvertes.fr/hal-01117408Test

المؤلفون: Veerle Van Gerwen, Vincent Timmerman, Klaus Wagner, Luciano Merlini, Christian Windpassinger, Christine Verellen, Albena Jordanova, Peter Van den Bergh, Ines Dierick, Michaela Auer-Grumbach, Nathalie Verpoorten, Lionel Van Maldergem, Els De Vriendt, Joy Irobi, Peter De Jonghe

المصدر: Brain

مصطلحات موضوعية: Adult, Pathology, medicine.medical_specialty, Adolescent, BSCL2, Russell-Silver Syndrome, Biology, Seipin, Genetic Heterogeneity, Distal amyotrophy, GTP-Binding Protein gamma Subunits, medicine, Humans, Spasticity, Child, Leg, Muscle Weakness, Spastic Paraplegia, Hereditary, Genetic heterogeneity, Muscle weakness, Syndrome, Middle Aged, Hand, Amyotrophy, medicine.disease, Pedigree, Muscular Atrophy, Phenotype, Muscle Spasticity, Mutation, Neurology (clinical), medicine.symptom, Hereditary Sensory and Motor Neuropathy

الوصف: Silver syndrome is a rare autosomal dominant neurodegenerative disorder characterized by marked amyotrophy and weakness of small hand muscles and spasticity in the lower limbs. The locus for Silver syndrome (SPG17) was assigned to a 13 cM region on chromosome 11q12-q14 in a single large pedigree. We recently found heterozygous mutations in the Berardinelli-Seip congenital lipodystrophy (BSCL2, seipin) gene causing SPG17 and distal hereditary motor neuropathy type V (distal HMN V). Here we report the clinical features of two families with heterozygous BSCL2 mutations. Interestingly, both families show a clinical phenotype different from classical Silver syndrome, and in some patients the phenotype is also different from distal HMN V. Patients in the first family had marked spasticity in the lower limbs and very striking distal amyotrophy that always started in the legs. Patients in the second family had distal amyotrophy sometimes starting and predominating in the legs, but no pyramidal tract signs. These observations broaden the clinical phenotype of disorders associated with BSCL2 mutations, having consequences for molecular genetic testing.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e5d903fcfbe019ecee37090c8ea6959Test
https://doi.org/10.1093/brain/awh232Test

المؤلفون: David Chitayat, Judith Melki, Monkol Lek, Stefanie M. Novak, Leigh B. Waddell, Norma B. Romero, Edoardo Malfatti, Jérome Maluenda, Adele D'Amico, Peter J. Houweling, Stacey Gabriel, Livija Medne, Vandana Gupta, Eva Holmberg, Katarina Pelin, James J. Dowling, Carina Wallgren-Pettersson, Ann E. Davidson, Enrico Bertini, Nicole Martin, William R. Telfer, David S. Gokhin, Velia M. Fowler, Yukiko K. Hayashi, Namrata Gupta, Daniel G. MacArthur, Carsten G. Bönnemann, Brett Thomas, Nigel F. Clarke, Ichizo Nishino, Kathryn N. North, Christopher T. Pappas, Carol C. Gregorio, Nigel G. Laing, Lindsay C. Swanson, Catherine A. Brownstein, Darcée D. Sloboda, Pablo Lapunzina, Patrick Shannon, Kate G. R. Quinlan, Natalia Moroz, Coen A.C. Ottenheijm, Alla S. Kostyukova, Peter Van den Bergh, David P. Bick, Ozge Ceyhan-Birsoy, Sarah A. Sandaradura, Annie Laquerrière, Emily J. Todd, Vilma Lotta Lehtokari, Mark J. Daly, Biljana Ilkovski, Alan H. Beggs, Michaela Yuen, Anders Flisberg, Flora Nolent, Gianina Ravenscroft

المساهمون: Department of Medical and Clinical Genetics, Biosciences, Genetics, Faculty of Biological and Environmental Sciences, Haartman Institute (-2014), Physiology, ICaR - Heartfailure and pulmonary arterial hypertension

المصدر: Yuen, M, Sandaradura, S A, Dowling, J J, Kostyukova, A S, Moroz, N, Quinlan, K G, Lehtokari, V L, Ravenscroft, G, Todd, E J, Ceyhan-Birsoy, O, Gokhin, D S, Maluenda, J, Lek, M, Nolent, F, Pappas, C T, Novak, S M, D'Amico, A, Malfatti, E, Thomas, B P, Gabriel, S B, Gupta, N, Daly, M J, Ilkovski, B, Houweling, P J, Davidson, A E, Swanson, L C, Brownstein, C A, Gupta, V A, Medne, L, Shannon, P, Martin, N, Bick, D P, Flisberg, A, Holmberg, E, van den Bergh, P, Lapunzina, P, Waddell, L B, Sioboda, D D, Bertini, E, Chitayat, D, Telfer, W R, Laquerriere, A, Gregorio, C C, Ottenheijm, C A C, Bonnemann, C G, Pelin, K, Beggs, A H, Hayashi, Y K, Romero, N B, Laing, N G, Nishino, I, Wallgren-Pettersson, C, Melki, J, Fowler, V M, MacArthur, D G, North, K N & Clarke, N F 2014, ' Leiomodin-3 dysfunction results in thin filament disorganization and nemaline myopathy ', Journal of Clinical Investigation, vol. 124, no. 11, pp. 4693-4708 . https://doi.org/10.1172/JCI75199Test
Journal of Clinical Investigation, 124(11), 4693-4708. The American Society for Clinical Investigation

مصطلحات موضوعية: Male, Pathology, DNA Mutational Analysis, Gene Expression, Muscle Proteins, TROPOMODULIN, Myopathies, Nemaline, 0302 clinical medicine, Nemaline myopathy, Myofibrils, LENGTH, Cells, Cultured, Zebrafish, 0303 health sciences, biology, Homozygote, Microfilament Proteins, Cardiac muscle, General Medicine, Cell biology, DEFICIENCY, POLYMERIZATION, medicine.anatomical_structure, Gene Knockdown Techniques, SKELETAL-MUSCLE, Female, Corrigendum, Tropomodulin, Research Article, POINTED-END, Heterozygote, medicine.medical_specialty, education, Mutation, Missense, Muscle disorder, ACTIN, 03 medical and health sciences, medicine, Animals, Humans, Genetic Predisposition to Disease, Muscle, Skeletal, Nemaline bodies, Genetic Association Studies, Actin, 030304 developmental biology, MUTATIONS, MUSCLE ALPHA-TROPOMYOSIN, Skeletal muscle, medicine.disease, Congenital myopathy, Actins, 3121 General medicine, internal medicine and other clinical medicine, N-TERMINUS, biology.protein, 3111 Biomedicine, Protein Multimerization, 030217 neurology & neurosurgery

الوصف: Nemaline myopathy (NM) is a genetic muscle disorder characterized by muscle dysfunction and electron-dense protein accumulations (nemaline bodies) in myofibers. Pathogenic mutations have been described in 9 genes to date, but the genetic basis remains unknown in many cases. Here, using an approach that combined whole-exome sequencing (WES) and Sanger sequencing, we identified homozygous or compound heterozygous variants in LMOD3 in 21 patients from 14 families with severe, usually lethal, NM. LMOD3 encodes leiomodin-3 (LMOD3), a 65-kDa protein expressed in skeletal and cardiac muscle. LMOD3 was expressed from early stages of muscle differentiation; localized to actin thin filaments, with enrichment near the pointed ends; and had strong actin filament-nucleating activity. Loss of LMOD3 in patient muscle resulted in shortening and disorganization of thin filaments. Knockdown of lmod3 in zebrafish replicated NM-associated functional and pathological phenotypes. Together, these findings indicate that mutations in the gene encoding LMOD3 underlie congenital myopathy and demonstrate that LMOD3 is essential for the organization of sarcomeric thin filaments in skeletal muscle.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59db3702ea8ec1b098d927c5634cb1caTest
https://research.vumc.nl/en/publications/3c042b02-2e92-4398-85b4-5ec89870e352Test

المؤلفون: Radim Mazanec, Nathalie Goemans, Albena Jordanova, H.-J. Christen, Christine Verellen, James R. Lupski, Jan De Bleecker, Paolo Vinci, Matthias Van Hul, Kristien Verhoeven, Rudy Van Coster, Els De Vriendt, Andrzej Kochański, Wim Robberecht, Jeffery M. Vance, Velina Guergueltcheva, Peter De Jonghe, Ian J. Butler, Gulam Mustafa Saifi, Peter Vieregge, Vedrana Milic Rasic, Filip Roelens, J. Michael Schröder, Eva Nelis, Chantal Ceuterick, Kristl Claeys, Pavel Seeman, Kinga Szigeti, Barbara Ryniewicz, Pedro Mancias, Stephan Züchner, Yoram Nevo, I. Tournev, Vincent Timmerman, María Teresa García Moreno, Michaela Auer-Grumbach, Joachim Weis, Peter Van den Bergh, Michael E. Shy

المصدر: Brain

مصطلحات موضوعية: Pathology, medicine.disease_cause, Severity of Illness Index, GTP Phosphohydrolases, 0302 clinical medicine, Degenerative disease, Charcot-Marie-Tooth Disease, Genotype, mitofusin 2, Age of Onset, Child, 0303 health sciences, Mutation, education.field_of_study, Middle Aged, Electrophysiology, medicine.anatomical_structure, Phenotype, Child, Preschool, Sensory nerve, Adult, medicine.medical_specialty, Adolescent, Population, Sural nerve, Biology, genotype-phenotype correlation, Mitochondrial Proteins, 03 medical and health sciences, Atrophy, atrophy, Sural Nerve, medicine, features, Humans, education, gene, 030304 developmental biology, Aged, Membrane Proteins, medicine.disease, charcot-marie-tooth type 2, mitofusin-2, Surgery, Microscopy, Electron, disease type-2, neuropathy, Neurology (clinical), Age of onset, 030217 neurology & neurosurgery

الوصف: Mutations in mitofusin 2 (MFN2) have been reported in Charcot–Marie–Tooth type 2 (CMT2) families. To study the distribution of mutations in MFN2 we screened 323 families and isolated patients with distinct CMT phenotypes. In 29 probands, we identified 22 distinct MFN2 mutations, and 14 of these mutations have not been reported before. All mutations were located in the cytoplasmic domains of the MFN2 protein. Patients presented with a classical but rather severe CMT phenotype, since 28% of them were wheelchair-dependent. Some had additional features as optic atrophy. Most patients had an early onset and severe disease status, whereas a smaller group experienced a later onset and milder disease course. Electrophysiological data showed in the majority of patients normal to slightly reduced nerve conduction velocities with often severely reduced amplitudes of the compound motor and sensory nerve action potentials. Examination of sural nerve specimens showed loss of large myelinated fibres and degenerative mitochondrial changes. In patients with a documented family history of CMT2 the frequency of MFN2 mutations was 33% indicating that MFN2 mutations are a major cause in this population. ispartof: Brain vol:129 issue:8 pages:2093-2102 ispartof: location:England status: published

وصف الملف: Print-Electronic; application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fbd19685d12f10b9f298f3ffdd049b5Test
https://pubmed.ncbi.nlm.nih.gov/16714318Test