المؤلفون: Anna Sarkozy, Erik-Jan Kamsteeg, Mark Pfuhl, Nicol C. Voermans, Martin Rees, Corrie E. Erasmus, Hülya-Sevcan Daimagüler, Steven A. Moore, Rahul Phadke, Mark R. Holt, Rolf Schröder, Istvan Bodi, Carla Grosmann, Sebahattin Cirak, E. Matthews, Ay Lin Kho, Peter Van den Bergh, Christian Thiel, Shane McKee, Joel Victor Fluss, Roksana Nikoopour, Charu Deshpande, Jens Reimann, Emily C. Oates, Maria Elena Farrugia, Özkan Özdemir, Isabelle Richard, Cristina Domínguez-González, Chaminda Konersman, Ekkehard Wilichowski, Birgit Brandmeier, Atsushi Fukuzawa, Ana Ferreiro, Heinz Jungbluth, Ros Quinlivan, Sandya Tirupathi, Mathias Gautel, Gabriele Dekomien, Cheryl Longman, Miguel A Fernandez-Garcia, Francesco Muntoni, Michael G. Hanna, Elizabeth Wraige, Elke Hobbiebrunken, Sarah Grover

المساهمون: UCL - SSS/IONS - Institute of NeuroScience, UCL - (SLuc) Service de neurologie, UCL - (SLuc) Centre de référence neuromusculaire, King‘s College London, Evelina London Children's Hospital, Guy's Hospital [London], University of Cologne, Children’s University Hospital of Geneva [Switzerland], Queen Elizabeth University Hospital (Glasgow), National Hospital for Neurology and Neurosurgery [London, UK], Great Ormond Street Hospital for Children [London] (GOSH), University College of London [London] (UCL), University of New South Wales [Sydney] (UNSW), Westmead Hospital [Sydney], University Hospital Erlangen [Germany], Universitätsklinikum Erlangen [Erlangen], University of Bonn Medical Centre [Bonn], Radboud university [Nijmegen], Rady Children's Hospital, Belfast City Hospital, Royal Belfast Hospital for Sick Children, University of Iowa [Iowa City], University of Göttingen - Georg-August-Universität Göttingen, Approches génétiques intégrées et nouvelles thérapies pour les maladies rares (INTEGRARE), Université d'Évry-Val-d'Essonne (UEVE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay-Généthon, Généthon, Saint-Luc University Hospital [Brussels, Belgium], Hospital Universitario 12 de Octubre [Madrid], Université de Paris (UP), Institut de Myologie, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Association française contre les myopathies (AFM-Téléthon)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), CHU Charles Foix [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), King's College Hospital (KCH), MRC Centre for Neuromuscular Diseases [London, UK], University Hospital Erlangen = Uniklinikum Erlangen, Radboud University [Nijmegen], Radboud University Medical Center [Nijmegen], Gillette Children's Specialty Healthcare [St Paul], Georg-August-University = Georg-August-Universität Göttingen, Ruhr-Universität Bochum [Bochum], Université Paris Cité (UPCité), Unité de Biologie Fonctionnelle et Adaptative (BFA (UMR_8251 / U1133)), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

المصدر: Acta Neuropathologica, 141, 431-453
Acta Neuropathologica, Vol. 141, no. 3, p. 431-453 (2021)
Acta Neuropathologica, 141, 3, pp. 431-453
Acta Neuropathologica
Acta Neuropathologica, Springer Verlag, 2021, 141 (3), pp.431-453. ⟨10.1007/s00401-020-02257-0⟩
Acta Neuropathologica, 2021, 141 (3), pp.431-453. ⟨10.1007/s00401-020-02257-0⟩

مصطلحات موضوعية: Adult, Male, 0301 basic medicine, Weakness, Adolescent, Myotonia Congenita, Mutation, Missense, Other Research Donders Center for Medical Neuroscience [Radboudumc 0], Extraocular muscles, Sensory disorders Donders Center for Medical Neuroscience [Radboudumc 12], Pathology and Forensic Medicine, Young Adult, 03 medical and health sciences, Cellular and Molecular Neuroscience, 0302 clinical medicine, Humans, Medicine, Missense mutation, Connectin, Child, Myopathy, Aged, Muscle contracture, Genetics, Phenocopy, Original Paper, biology, business.industry, Infant, [SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology, Middle Aged, Disorders of movement Donders Center for Medical Neuroscience [Radboudumc 3], medicine.disease, Congenital myopathy, 3. Good health, 030104 developmental biology, medicine.anatomical_structure, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, Child, Preschool, biology.protein, Female, Titin, Neurology (clinical), medicine.symptom, business, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, 030217 neurology & neurosurgery

الوصف: Mutations in the sarcomeric protein titin, encoded byTTN, are emerging as a common cause of myopathies. The diagnosis of aTTN-related myopathy is, however, often not straightforward due to clinico-pathological overlap with other myopathies and the prevalence ofTTNvariants in control populations. Here, we present a combined clinico-pathological, genetic and biophysical approach to the diagnosis ofTTN-related myopathies and the pathogenicity ascertainment ofTTNmissense variants. We identified 30 patients with a primaryTTN-related congenital myopathy (CM) and two truncating variants, or one truncating and one missenseTTNvariant, or homozygous for oneTTNmissense variant. We found that TTN-related myopathies show considerable overlap with other myopathies but are strongly suggested by a combination of certain clinico-pathological features. Presentation was typically at birth with the clinical course characterized by variable progression of weakness, contractures, scoliosis and respiratory symptoms but sparing of extraocular muscles. Cardiac involvement depended on the variant position. Our biophysical analyses demonstrated that missense mutations associated with CMs are strongly destabilizing and exert their effect when expressed on a truncating background or in homozygosity. We hypothesise that destabilizingTTNmissense mutations phenocopy truncating variants and are a key pathogenic feature of recessive titinopathies that might be amenable to therapeutic intervention.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a50b0834b2069a16869cd3b6e7cc432fTest
http://hdl.handle.net/2066/231686Test

المؤلفون: Joan Fabregat, Carlos Casasnovas, Richard C. Daly, Bo Göran Ericzon, Laura Lladó, John J. Poterucha, Jan Lerut, Marie Tranäng, Julie K. Heimbach, Jose Gonzalez Costello, Peter Van den Bergh, Maxime Foguenne, Adriano-Valerio Schettini, Olivier Van Caenegem

المساهمون: UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - SSS/IREC/CARD - Pôle de recherche cardiovasculaire, UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience, UCL - (SLuc) Service de soins intensifs, UCL - (SLuc) Centre de référence neuromusculaire, UCL - (SLuc) Service de neurologie

المصدر: Hepatobiliary & Pancreatic Diseases International, Vol. 20, no. 4, p. 323-329 (2021)

مصطلحات موضوعية: medicine.medical_specialty, medicine.medical_treatment, Cardiomyopathy, Hereditary transthyretin amyloidosis, Liver transplantation, Heart transplantation, Gastroenterology, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, Medicine, Humans, Prealbumin, Amyloid Neuropathies, Familial, Hepatology, biology, business.industry, Amyloidosis, Hypertrophic cardiomyopathy, Non-Val30Met mutation, Autosomal dominant trait, medicine.disease, Liver Transplantation, Transplantation, Transthyretin, Early Diagnosis, Domino liver transplantation, 030220 oncology & carcinogenesis, biology.protein, 030211 gastroenterology & hepatology, Val122del mutation, business, Cardiomyopathies

الوصف: Background Hereditary transthyretin (ATTRv) amyloidosis is an autosomal dominant disease linked to transthyretin gene mutations which cause instability of the transthyretin tetramer. After dissociation and misfolding they reassemble as insoluble fibrils (i.e. amyloid). Apart from the common Val30Met mutation there is a very heterogeneous group of non-Val30Met mutations. In some cases, the clinical picture is dominated by a rapidly evolving restrictive and hypertrophic cardiomyopathy. Methods A case series of four liver recipients with the highly clinically relevant, rare and particularly aggressive Val122del mutation is presented. Medical and surgical therapeutic options, waiting list policy for ATTRv-amyloidosis, including the need for heart transplantation, and status of heart-liver transplantation are discussed. Results Three patients needed a staged (1 patient) or simultaneous (2 patients) heart-liver transplant due to rapidly progressing cardiac failure and/or neurologic disability. Domino liver transplantation was impossible in two due to fibrotic hepatic transformation caused by cardiomyopathy. After a follow-up ranging from 3.5 to 9.5 years, cardiac (allograft) function was maintained in all patients, but neuropathy progressed in three patients, one of whom died after 80 months. Conclusions This is the first report in (liver) transplant literature about the rare Val122del ATTRv mutation. Due to its aggressiveness, symptomatic patients should be prioritized on the liver and, in cases with cardiomyopathy, heart waiting lists in order to avoid the irreversible neurological and cardiac damage that leads to a rapid lethal outcome.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ad5bee945941ae32ebbe287a31ee37fcTest
https://hdl.handle.net/2078.1/248202Test

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: Maike F. Dohrn, Matthias Vorgerd, Joachim Weis, Jan De Bleecker, Peter Van den Bergh, Kristl G. Claeys, Jörg B. Schulz, Jean-Jacques Martin, Katrin Hinderhofer, Andreas Ferbert, Christoph Röcken, J. Michael Schröder

المساهمون: UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie

المصدر: Journal of Neurology : official journal of the European Neurological Society, Vol. 260, no.12, p. 3093-3108 (2013)
Journal of neurology

مصطلحات موضوعية: Tafamidis, Male, Pathology, medicine.medical_specialty, endocrine system, Late onset, chemistry.chemical_compound, Medicine, Humans, Ataxic Gait, Age of Onset, Aged, Aged, 80 and over, Amyloid Neuropathies, Familial, biology, business.industry, Autosomal dominant trait, nutritional and metabolic diseases, medicine.disease, Pedigree, Amyloid Neuropathy, Transthyretin, Neurology, chemistry, biology.protein, Disease Progression, Female, Neurology (clinical), Human medicine, Age of onset, business, Polyneuropathy

الوصف: Familial amyloid polyneuropathy (FAP) is a progressive systemic autosomal dominant disease caused by pathogenic mutations in the transthyretin (TTR) gene. We studied clinical, electrophysiological, histopathological, and genetic characteristics in 15 (13 late-onset and two early-onset) patients belonging to 14 families with polyneuropathy and mutations in TTR. In comparison, we analysed the features of nine unrelated patients with an idiopathic polyneuropathy, in whom TTR mutations have been excluded. Disease occurrence was familial in 36 % of the patients with TTR-associated polyneuropathy and the late-onset type was observed in 86 % (mean age at onset 65.5 years). Clinically, all late-onset TTR-mutant patients presented with distal weakness, pansensory loss, absence of deep tendon reflexes, and sensorimotor hand involvement. Afferent-ataxic gait was present in 92 % leading to wheelchair dependence in 60 % after a mean duration of 4.6 years. Autonomic involvement was observed in 60 %, and ankle edema in 92 %. The sensorimotor polyneuropathy was from an axonal type in 82 %, demyelinating or mixed type in 9 % each. Compared to the TTR-unmutated idiopathic polyneuropathy patients, we identified rapid progression, early ambulatory loss, and autonomic disturbances, associated with a severe polyneuropathy as red flags for TTRFAP. In 18 % of the late-onset TTR-FAP patients, no amyloid was found in nerve biopsies. Further diagnostic pitfalls were unspecific electrophysiology, and coincident diabetes mellitus (23 %) or monoclonal gammopathy (7 %). We conclude that a rapid disease course, severely ataxic gait, hand involvement, and autonomic dysfunction are diagnostic hallmarks of late-onset TTRFAP. Genetic analysis should be performed even when amyloid deposits are lacking or when polyneuropathy-causing comorbidities are concomitant.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfd25c49dcccba3278d8c90be0daa5f6Test
https://pubmed.ncbi.nlm.nih.gov/24101130Test

المؤلفون: Yusuf A. Rajabally, Peter Van den Bergh

المصدر: Presse medicale (Paris, France : 1983). 42(6 Pt 2)

مصطلحات موضوعية: medicine.medical_specialty, Nerve biopsy, biology, medicine.diagnostic_test, business.industry, Prevalence, Disease Management, Peripheral Nervous System Diseases, Polyradiculoneuropathy, General Medicine, Disease, Gold standard (test), medicine.disease, Gastroenterology, Pathophysiology, Pathogenesis, Treatment Outcome, Polyradiculoneuropathy, Chronic Inflammatory Demyelinating, Internal medicine, biology.protein, Medicine, Humans, Immunotherapy, Antibody, business

الوصف: Chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) is the most common autoimmune neuropathy. The diagnosis depends on the clinical presentation with a progressive or relapsing course over at least 2 months and electrophysiological evidence of primary demyelination. Whereas typical CIDP is quite easily recognizable because virtually no other neuropathies present with both distal and proximal motor and sensory deficit, atypical CIDP, focal and multifocal variants in particular, may represent a difficult diagnostic challenge. CIDP very likely is an underdiagnosed condition as suggested also by a positive correlation between prevalence rates and sensitivity of electrophysiological criteria. Since no 'gold standard' diagnostic marker exists, electrophysiological criteria have been optimized to be at the same time as sensitive and as specific as possible. Additional supportive laboratory features, such as increased spinal fluid protein, MRI abnormalities of nerve segments, and in selected cases nerve biopsy lead to the correct diagnosis in the large majority of the cases. Objective clinical improvement following immune therapy is also a useful parameter to confirm the diagnosis. The pathogenesis and pathophysiology of CIDP remain poorly understood, but the available evidence for an inflammatory origin is quite convincing. Steroids, intravenous immunoglobulin (IVIG), and plasma exchange (PE) have been proven to be effective treatments. IVIG usually leads to rapid improvement, which is useful in severely disabled patients. Repeat treatment over regular time intervals for many years is often necessary. The effect of steroids is slower and the side-effect profile may be problematic, but they may induce disease remission more frequently than IVIG. An important and as of yet uncompletely resolved issue is the evaluation of long-term outcome to determine whether the disease is still active and responsive to treatment.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24adb898fff4325bd3aa1b3c2de19723Test
https://pubmed.ncbi.nlm.nih.gov/23623582Test

المؤلفون: Benedikt Schoser, Wolfgang Müller-Felber, Angela Vincent, Detlef Claus, Christian Kubisch, Giuseppe Vita, David Hilton-Jones, Hans H. Goebel, Saiju Jacob, Antonio Toscano, Peter Van den Bergh

المصدر: Neuromuscular disorders : NMD. 19(3)

مصطلحات موضوعية: myalgia, Adult, Male, Pathology, medicine.medical_specialty, Caveolin 3, Immunogenic, medicine.medical_treatment, Muscle Fibers, Skeletal, Muscle Proteins, Caveolin-3, Myasthenia gravis, Rippling muscle disease, Therapy, Azathioprine, Thymus Gland, Gene mutation, Biology, Caveolae, Dysferlin, Muscular Diseases, Myasthenia Gravis, medicine, Humans, Muscle, Skeletal, Genetics (clinical), Aged, Autoantibodies, Sarcolemma, Electromyography, Autoantibody, Plasmapheresis, Middle Aged, medicine.disease, Neurology, Pediatrics, Perinatology and Child Health, biology.protein, Female, Steroids, Neurology (clinical), Cholinesterase Inhibitors, medicine.symptom, medicine.drug, Follow-Up Studies, Muscle Contraction

الوصف: We report seven patients with immune-mediated rippling muscle disease (iRMD) and AChR-antibody positive myasthenia gravis (MG) without germline caveolin-3 gene mutations. We describe the follow-up of two patients and the clinical features of five new patients (1 female, 4 male, aged 32 to 69 years). These presented with significant generalized, exercise-induced and electrically-silent muscle rippling with myalgia, combined with generalized MG. In two of the seven patients, MG appeared before iRMD. Mediastinal imaging excluded thymic alterations in all, although two had other coincident tumours. Myalgia and rippling were aggravated by acetylcholinesterase-inhibitor treatment. Generalized MG and iRMD were successfully treated with plasma exchange, steroids and azathioprine in the two patients followed long-term. Muscle morphology of five patients showed a minimal myopathic pattern with rare lymphohistiocytic infiltration. In four patients, sarcolemmal caveolin-3, and dysferlin immunofluorescence staining was moderately reduced in a mosaic pattern, but caveolin-3 protein on Western blots was clearly reduced only in two. Notably, electron microscopy showed that caveolae were almost completely lost at the sarcolemma in the three biopsies examined but not in endothelium. Antibodies targeting high molecular weight muscle proteins, likely associated with the neuromuscular endplate and sarcolemma, were found in the iRMD patients but also in age-matched MG patients without iRMD. Since the generalized MG and iRMD improved with immunosuppressive treatments, it is likely that both are caused by autoantibodies, but the target for pathogenic antibodies in iRMD requires further study.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c384b86b02ed288872375b4a96f3adc4Test
https://pubmed.ncbi.nlm.nih.gov/19208478Test

المؤلفون: Caroline Sewry, Peter Van den Bergh, Francesco Muntoni, Corrado Angelini, Salla Ranta, Vilma Lotta Lehtokari, Kati Donner, Kate Bushby, Katarina Pelin, Susan T. Iannaccone, Nigel G. Laing, Carina Wallgren-Pettersson, Maria Sandbacka

المصدر: Human mutation. 27(9)

مصطلحات موضوعية: Male, Nonsense mutation, DNA Mutational Analysis, Muscle Proteins, Genes, Recessive, Biology, Compound heterozygosity, Myopathies, Nemaline, 03 medical and health sciences, Exon, Nebulin, 0302 clinical medicine, Tropomyosin binding, Nemaline myopathy, Genetics, medicine, Humans, Point Mutation, Frameshift Mutation, Genetics (clinical), Chromatography, High Pressure Liquid, 030304 developmental biology, 0303 health sciences, Point mutation, Exons, medicine.disease, Molecular biology, Exon skipping, Introns, 3. Good health, Codon, Nonsense, biology.protein, Female, RNA Splice Sites, 030217 neurology & neurosurgery, Gene Deletion

الوصف: Nemaline myopathy (NM) is a clinically and genetically heterogeneous disorder of skeletal muscle caused by mutations in at least five different genes encoding thin filament proteins of the striated muscle sarcomere. We have previously described 18 different mutations in the last 42 exons of the nebulin gene (NEB) in 18 families with NM. Here we report 45 novel NEB mutations detected by denaturing high-performance liquid chromatography (dHPLC) and sequence analysis of all 183 NEB exons in NM patients from 44 families. Altogether we have identified, including the deletion of exon 55 identified in the Ashkenazi Jewish population, 64 different mutations in NEB segregating with autosomal recessive NM in 55 families. The majority (55%) of the mutations in NEB are frameshift or nonsense mutations predicted to cause premature truncation of nebulin. Point mutations (25%) or deletions (3%) affecting conserved splice signals are predicted in the majority of cases to cause in-frame exon skipping, possibly leading to impaired nebulin-tropomyosin interaction along the thin filament. Patients in 18 families had one of nine missense mutations (14%) affecting conserved amino acids at or in the vicinity of actin or tropomyosin binding sites. In addition, we found the exon 55 deletion in four families. The majority of the patients (in 49/55 families) were shown to be compound heterozygous for two different mutations. The mutations were found in both constitutively and alternatively expressed exons throughout the NEB gene, and there were no obvious mutational hotspots. Patients with more severe clinical pictures tended to have mutations predicted to be more disruptive than patients with milder forms.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35a256f7181c370426ab73d084036ea4Test
https://pubmed.ncbi.nlm.nih.gov/16917880Test

المؤلفون: Peter Hackman, Sylvie Marchand, Bjarne Udd, Peter Van den Bergh, Isabelle Richard, Olivier Bouquiaux, Christine Verellen

المصدر: Annals of neurology. 54(2)

مصطلحات موضوعية: Male, medicine.medical_specialty, DNA Mutational Analysis, Muscle Proteins, Locus (genetics), Biology, Asymptomatic, Muscular Dystrophies, 03 medical and health sciences, 0302 clinical medicine, Tibialis anterior muscle, Belgium, Internal medicine, medicine, Humans, Point Mutation, Connectin, Family, Muscular dystrophy, Myopathy, Muscle, Skeletal, Creatine Kinase, Gait Disorders, Neurologic, 030304 developmental biology, Subclinical infection, Aged, 0303 health sciences, Leg, Electromyography, Anatomy, DNA, Exons, Middle Aged, medicine.disease, Penetrance, Pedigree, stomatognathic diseases, Neurology, biology.protein, Titin, Female, Neurology (clinical), medicine.symptom, Tomography, X-Ray Computed, human activities, Protein Kinases, 030217 neurology & neurosurgery

الوصف: We report a Belgian family with autosomal dominant, late-onset, distal myopathy with selective foot extensor muscle involvement of the lower legs. Linkage to the tibial muscular dystrophy (TMD) locus 2q31 was not evident at first because of incomplete disease penetrance in a 50-year-old asymptomatic family member. An abnormal tibialis anterior muscle biopsy established her subclinical status and linkage of the family to the TMD locus. Mutation analysis showed a disease-specific, heterozygous point mutation in the last exon, Mex6, of the titin gene. This is the third mutation found in TMD and the second European family with TMD outside the Finnish population, suggesting that titinopathies may occur in various populations.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbb5d62d3982a7bd5711ab5ba1d94b92Test
https://pubmed.ncbi.nlm.nih.gov/12891679Test

المؤلفون: Keshav Rao, Christine Verellen, Peter Van den Bergh, Andrea I. McClatchey, James F. Gusella, Wendy H. Raskind, Jonathan L. Haines, Diane McKenna-Yasek, Margaret A. Pericak-Vance, Thomas D. Bird, Robert H. Brown

المصدر: Cell. 68(4)

مصطلحات موضوعية: Models, Molecular, Myotonia Congenita, Nav1.4, Molecular Sequence Data, Muscle Proteins, General Biochemistry, Genetics and Molecular Biology, Sodium Channels, medicine, Humans, Hyperkalemic periodic paralysis, Amino Acid Sequence, Genetics, CLCN1, biology, Base Sequence, Myotonia congenita, Sodium channel, Skeletal muscle, medicine.disease, Myotonia, Cell biology, Pedigree, Cold Temperature, medicine.anatomical_structure, Paramyotonia congenita, biology.protein, Sequence Alignment

الوصف: Paramyotonia congenita (PMC), a dominant disorder featuring cold-induced myotonia (muscle stiffness), has recently been genetically linked to a candidate gene, the skeletal muscle sodium channel gene SCN4A. We have now established that SCN4A is the disease gene in PMC by identifying two different single-base coding sequence alterations in PMC families. Both mutations affect highly conserved residues in the III-IV cytoplasmic loop, a portion of the sodium channel thought to pivot in response to membrane depolarization, thereby blocking and inactivating the channel. Abnormal function of this cytoplasmic loop therefore appears to produce the Na+ current abnormality and the unique temperature-sensitive clinical phenotype in this disorder.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3575595df6c311cf814c7b08a6f777dcTest
https://pubmed.ncbi.nlm.nih.gov/1310898Test