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Wahbi K, Bassez G, Duchateau J, Salort-Campana E, Vicart S, Desaphy JF, Labombarda F, Sellal JM, Deharo JC. Expert opinion on mexiletine treatment in adult patients with myotonic dystrophy. Arch Cardiovasc Dis 2024:S1875-2136(24)00059-7. [PMID: 38677940 DOI: 10.1016/j.acvd.2024.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/13/2024] [Accepted: 03/25/2024] [Indexed: 04/29/2024]
Abstract
In France, mexiletine - a class I antiarrhythmic drug - can be prescribed for the symptomatic treatment of myotonia of the skeletal muscles in adult patients with myotonic dystrophy under a compassionate use programme. Mexiletine is used according to its summary of product characteristics, which describes its use for myotonia treatment in adult patients with non-dystrophic myotonia, a different neuromuscular condition without cardiac involvement. A cardiac assessment is required prior to initiation and throughout treatment due to potential proarrhythmic effects. The presence of conduction system disease, the most common cardiac manifestation of myotonic dystrophy, mandates repeated cardiac evaluations in patients with this condition, and becomes even more important when they are given mexiletine. A group of experts, including three neurologists and five cardiologists from French neuromuscular reference centres, were involved in a task force to develop a treatment algorithm to guide mexiletine use in myotonic dystrophy. The recommendations are based on data from a literature review of the safety of mexiletine-treated patients with myotonic dystrophy, the compassionate use protocol for mexiletine and the personal clinical experience of the experts. The main conclusion of the expert group is that, although existing safety data in mexiletine-treated patients with myotonic dystrophy are reassuring, cardiac assessments should be reinforced in such patients compared with mexiletine-treated patients with non-dystrophic myotonia. This expert opinion to guide mexiletine treatment in patients with myotonic dystrophy should help to reduce the risk of severe adverse events and facilitate interactions between specialists involved in the routine care of patients with myotonic dystrophy.
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Affiliation(s)
- Karim Wahbi
- Centre de Référence des Maladies Neuromusculaires Nord/Est/Île-de-France, Cardiology Department, Cochin Hospital, AP-HP, Paris Cité University, 75014 Paris, France; Paris Cardiovascular Research Centre (PARCC), Inserm Unit 970, Georges-Pompidou European Hospital, 75015 Paris, France.
| | - Guillaume Bassez
- Constitutive Reference Centre for Neuromuscular Diseases, Neuro-Myology Department, Pitié-Salpêtrière University Hospital, AP-HP, 75013 Paris, France
| | - Josselin Duchateau
- Department of Cardiology, Electrophysiology and Cardiac Pacing, Haut l'Evêque Cardiology Hospital, CHU de Bordeaux, 33604 Pessac, France
| | - Emmanuelle Salort-Campana
- Reference Centre for Neuromuscular Diseases PACA/Réunion/Rhône Alpes, La Timone Hospital, CHU de Marseille, AP-HM, 13385 Marseille, France; FILNEMUS, Neuromuscular Rare Diseases Healthcare Professional Network, La Timone Hospital, CHU de Marseille, AP-HM, 13385 Marseille, France
| | - Savine Vicart
- Muscle Channelopathies Reference Centre, Neuro-Myology Department, Pitié-Salpêtrière University Hospital, AP-HP, Inserm UMR 974, Institute of Myology, Sorbonne University, 75013 Paris, France
| | - Jean-François Desaphy
- Department of Precision and Regenerative Medicine and Ionian Area, School of Medicine, University of Bari Aldo Moro, 70124 Bari, Italy
| | - Fabien Labombarda
- Cardiology Department, CHU de Caen, UR 4650, UNICAEN, 14000 Caen, France
| | | | - Jean-Claude Deharo
- Cardiology Department, La Timone Hospital, CHU de Marseille, AP-HM, 13385 Marseille, France; C2VN, Aix-Marseille Université, 13005 Marseille, France
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Matthews E, Palace J, Ramdas S, Sansone V, Tristani-Firouzi M, Vicart S, Willis T. Care Recommendations for the Investigation and Management of Children With Skeletal Muscle Channelopathies. Pediatr Neurol 2023; 145:102-111. [PMID: 37315339 DOI: 10.1016/j.pediatrneurol.2023.05.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/12/2023] [Accepted: 05/14/2023] [Indexed: 06/16/2023]
Abstract
The field of pediatric skeletal muscle channelopathies has seen major new advances in terms of a wider understanding of clinical presentations and new phenotypes. Skeletal muscle channelopathies cause significant disability and even death in some of the newly described phenotypes. Despite this, there are virtually no data on the epidemiology and longitudinal natural history of these conditions or randomized controlled trial evidence of efficacy or tolerability of any treatment in children, and thus best practice care recommendations do not exist. Clinical history, and to a lesser extent examination, is key to eliciting symptoms and signs that indicate a differential diagnosis of muscle channelopathy. Normal routine investigations should not deter one from the diagnosis. Specialist neurophysiologic investigations have an additional role, but their availability should not delay genetic testing. New phenotypes are increasingly likely to be identified by next-generation sequencing panels. Many treatments or interventions for symptomatic patients are available, with anecdotal data to support their benefit, but we lack trial data on efficacy, safety, or superiority. This lack of trial data in turn can lead to hesitancy in prescribing among doctors or in accepting medication by parents. Holistic management addressing work, education, activity, and additional symptoms of pain and fatigue provides significant benefit. Preventable morbidity and sometimes mortality occurs if the diagnosis and therefore treatment is delayed. Advances in genetic sequencing technology and greater access to testing may help to refine recently identified phenotypes, including histology, as more cases are described. Randomized controlled treatment trials are required to inform best practice care recommendations. A holistic approach to management is essential and should not be overlooked. Good quality data on prevalence, health burden, and optimal treatment are urgently needed.
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Affiliation(s)
- Emma Matthews
- Department of Neurology, Atkinson-Morley Neuromuscular Centre, St George's University Hospitals NHS Foundation Trust, and Molecular and Clinical Sciences Research Institute, St George's University of London, London, UK.
| | - Jacqueline Palace
- Clinical Neurology, John Radcliffe Hospital, Oxford University Foundation Trust, Oxford, UK; Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Sithara Ramdas
- Department of Paediatrics, MDUK Neuromuscular Centre, University of Oxford, Oxford, UK; Department of Paediatric Neurology, John Radcliffe Hospital, Oxford, UK
| | - Valeria Sansone
- Neurorehabilitation Unit, Neuromuscular Omnicentre Clinical Center, Niguarda Hospital, University of Milan, Milan, Italy
| | - Martin Tristani-Firouzi
- Nora Eccles Harrison Cardiovascular Research and Training Institute and the Division of Paediatric Cardiology, University of Utah, Salt Lake City, Utah
| | - Savine Vicart
- Reference Centre for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Tracey Willis
- Robert Jones and Agnes Hunt Orthopaedic Hospital, NHS Foundation Trust, Oswestry, England
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3
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Berling E, Verebi C, Venturelli N, Vassilopoulos S, Béhin A, Tard C, Michaud M, Villar Quiles RN, Vicart S, Masingue M, Carlier RY, Romero NB, Lacene E, Leturcq F, Eymard B, Laforêt P, Stojkovic T. Caveolinopathy: clinical, histological and muscle imaging features and follow-up in a multicenter retrospective cohort. Eur J Neurol 2023. [PMID: 37166430 DOI: 10.1111/ene.15832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 02/10/2023] [Accepted: 04/13/2023] [Indexed: 05/12/2023]
Abstract
BACKGROUND CAV3 gene mutations, mostly inherited as an autosomal dominant trait, cause various skeletal muscle diseases. Clinical presentations encompass proximal myopathy, distal myopathy, or an isolated persistent high creatine kinase (CK) with a major overlapping phenotype. METHODS Twenty-three patients with CAV3 symptomatic mutations, from 16 different families, were included in a retrospective cohort. Mean follow-up duration was 24.2 ± 15.0 years. Clinical and functional data were collected during the follow-up. The results of muscle imaging, electroneuromyography and muscle histopathology and immunohistochemistry and caveolin-3 Western blot analysis were also compiled. RESULTS Exercise intolerance was the most common phenotype (52%). Eighty percent of patients had calf hypertrophy and only 65% of patients presented a rippling. One patient presented initially with camptocormia. A walking aid was required in only two patients. Electroneuromyography was mostly normal. CK level was elevated in all patients. No patient had cardiac or respiratory impairment. Muscle imaging showed fatty involvement of semimembranosus, semitendinosus, rectus femoris, biceps brachialis and spinal muscles. Almost all (87%) of the biopsies were abnormal but without any specific pattern. While a quarter of patients had normal caveolin-3 immunohistochemistry results, Western blots disclosed a reduced amount of the protein. We report nine mutations, including four not previously described. No phenotype-genotype correlation was evidenced. CONCLUSIONS Caveolinopathy have diverse clinical, muscle imaging and histological presentations but often have limited functional impact. Mild forms of the disease, an atypical phenotype and normal caveolin-3 immunostaining are pitfalls leading to misdiagnosis.
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Affiliation(s)
- Edouard Berling
- APHP, Service de Neurologie, Hôpital Raymond Poincaré, Garches, France
- APHP, Centre de référence Nord-Est- Ile-de-France, FHU PHENIX, France
- Université de Versailles Saint-Quentin-en-Yvelines, U 1179 INSERM, Paris-Saclay, France
| | - Camille Verebi
- APHP, Université de Paris Centre, Service de Médecine Génomique des Maladies de Système et d'Organe, Fédération de Génétique et de Médecine Génomique, Hôpital Cochin, Paris, France
| | - Nadia Venturelli
- APHP, GHU Paris-Saclay, DMU Smart Imaging, Service d'imagerie médicale, Hôpital Raymond Poincaré, Garches, France
| | - Stéphane Vassilopoulos
- Sorbonne Université, UMRS974, - INSERM, Centre de Recherche en Myologie, Institut de Myologie Paris, France
| | - Anthony Béhin
- APHP, Sorbonne Université, Service de Neuromyologie, Centre de référence Nord-Est-Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - Céline Tard
- CHU de Lille, Service de Neurologie, Centre de référence des maladies neuromusculaires Nord-Est-Ile-de-France, U1172, Unité d'expertise cognitivo-motrice, Lille, France
| | - Maud Michaud
- CHRU Central Nancy, Service de Neurologie, Centre de référence Nord-Est-, Ile-de-France, Nancy, France
| | - Rocio Nur Villar Quiles
- APHP, Sorbonne Université, Service de Neuromyologie, Centre de référence Nord-Est-Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
- APHP, Sorbonne Université, INSERM UMR 974, Service de Neuromyologie, Centre de référence des canalopathies musculaires, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - Savine Vicart
- APHP, Sorbonne Université, INSERM UMR 974, Service de Neuromyologie, Centre de référence des canalopathies musculaires, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - Marion Masingue
- APHP, Sorbonne Université, Service de Neuromyologie, Centre de référence Nord-Est-Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - Robert-Yves Carlier
- APHP, GHU Paris-Saclay, DMU Smart Imaging, Service d'imagerie médicale, Hôpital Raymond Poincaré, Garches, France
- Université Versailles Saint-Quentin-en-Yvelines, UMR 1179 End-Icap, Paris-Saclay, France
| | - Norma Beatriz Romero
- Sorbonne Université, UMRS974, - INSERM, Centre de Recherche en Myologie, Institut de Myologie Paris, France
- APHP, Unité de Morphologie neuromusculaire, Centre de référence des maladies neuromusculaires Nord-Est- Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - Emmanuelle Lacene
- APHP, Unité de Morphologie neuromusculaire, Centre de référence des maladies neuromusculaires Nord-Est- Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
| | - France Leturcq
- APHP, Université de Paris Centre, Service de Médecine Génomique des Maladies de Système et d'Organe, Fédération de Génétique et de Médecine Génomique, Hôpital Cochin, Paris, France
| | - Bruno Eymard
- APHP, Service de Neurologie, Hôpital Raymond Poincaré, Garches, France
| | - Pascal Laforêt
- APHP, Service de Neurologie, Hôpital Raymond Poincaré, Garches, France
- APHP, Centre de référence Nord-Est- Ile-de-France, FHU PHENIX, France
- Université de Versailles Saint-Quentin-en-Yvelines, U 1179 INSERM, Paris-Saclay, France
| | - Tanya Stojkovic
- APHP, Sorbonne Université, Service de Neuromyologie, Centre de référence Nord-Est-Ile-de-France, Institut de Myologie, Hôpital Pitié-Salpêtrière, Paris, France
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Villar-Quiles RN, Sternberg D, Tredez G, Beatriz Romero N, Evangelista T, Lafôret P, Cintas P, Sole G, Sacconi S, Bendahhou S, Franques J, Cances C, Noury JB, Delmont E, Blondy P, Perrin L, Hezode M, Fournier E, Fontaine B, Stojkovic T, Vicart S. Phenotypical variability and atypical presentations in a French cohort of Andersen-Tawil syndrome. Eur J Neurol 2022; 29:2398-2411. [PMID: 35460302 DOI: 10.1111/ene.15369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/31/2022] [Accepted: 04/18/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND AND PURPOSE Andersen-Tawil syndrome (ATS) is a skeletal muscle channelopathy caused by KCNJ2 mutations, characterized by a clinical triad of periodic paralysis, cardiac arrhythmias and dysmorphism. The muscle phenotype, particularly the atypical forms with prominent permanent weakness or predominantly painful symptoms, remains incompletely characterized. METHODS A retrospective clinical, histological, electroneuromyography (ENMG) and genetic analysis of molecularly confirmed ATS patients, diagnosed and followed up at neuromuscular reference centers in France, was conducted. RESULTS Thirty-five patients from 27 unrelated families carrying 17 different missense KCNJ2 mutations (four novel mutations) and a heterozygous KCNJ2 duplication are reported. The typical triad was observed in 42.9% of patients. Cardiac abnormalities were observed in 65.7%: 56.5% asymptomatic and 39.1% requiring antiarrhythmic drugs. 71.4% of patients exhibited dysmorphic features. Muscle symptoms were reported in 85.7%, amongst whom 13.3% had no cardiopathy and 33.3% no dysmorphic features. Periodic paralysis was present in 80% and was significantly more frequent in men. Common triggers were exercise, immobility and carbohydrate-rich diet. Ictal serum potassium concentrations were low in 53.6%. Of the 35 patients, 45.7% had permanent weakness affecting proximal muscles, which was mild and stable or slowly progressive over several decades. Four patients presented with exercise-induced pain and myalgia attacks. Diagnostic delay was 14.4 ± 9.5 years. ENMG long-exercise test performed in 25 patients (71.4%) showed in all a decremental response up to 40%. Muscle biopsy performed in 12 patients revealed tubular aggregates in six patients (associated in two of them with vacuolar lesions), dystrophic features in one patient and non-specific myopathic features in one patient; it was normal in four patients. DISCUSSION Recognition of atypical features (exercise-induced pain or myalgia and permanent weakness) along with any of the elements of the triad should arouse suspicion. The ENMG long-exercise test has a high diagnostic yield and should be performed. Early diagnosis is of utmost importance to improve disease prognosis.
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Affiliation(s)
- Rocio Nur Villar-Quiles
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France.,Institute of Myology, Centre de Recherche en Myologie, UMRS974, Sorbonne Université - INSERM, Paris, France
| | - Damien Sternberg
- Reference Center for Muscle Channelopathies, Service de Biochimie et Centre de Génétique, APHP, Pitié-Salpêtrière Hospital, Paris, France
| | - Grégoire Tredez
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Norma Beatriz Romero
- Institute of Myology, Centre de Recherche en Myologie, UMRS974, Sorbonne Université - INSERM, Paris, France.,Neuromuscular Morphology Unit, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Teresinha Evangelista
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France.,Institute of Myology, Centre de Recherche en Myologie, UMRS974, Sorbonne Université - INSERM, Paris, France.,Neuromuscular Morphology Unit, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Pascal Lafôret
- Reference Center for Neuromuscular Disorders, APHP, Raymond-Poincaré Hospital, Paris, France
| | - Pascal Cintas
- Neurology Department, Pierre-Paul Riquet Hospital, CHU Toulouse, Toulouse, France
| | - Guilhem Sole
- Reference Centre for Neuromuscular Disorders, Pellegrin Hospital CHU Bordeaux, Bordeaux, France
| | - Sabrina Sacconi
- Neuromuscular Diseases and ALS Specialized Center, University of Nice-Sophia Antipolis, Nice, France
| | - Said Bendahhou
- UMR7370 CNRS, LP2M, Labex ICST, Faculty of Medicine, University of Nice-Sophia Antipolis, Nice, France
| | - Jérôme Franques
- Assistance Publique-Hôpitaux de Marseille, Department of Neurology and Neuromuscular Diseases, La Timone Hospital, Marseille, France
| | - Claude Cances
- AOC (Atlantique-Occitanie-Caraïbe) Reference Centre for Neuromuscular Disorders, Neuropediatric Department, Toulouse University Hospital, Toulouse, France
| | - J B Noury
- Neurology Department, Neuromuscular Center, CHRU Cavale Blanche, Brest, France
| | - Emilien Delmont
- Department of Neurology, University Hospital Timone, Marseille, France
| | - Patricia Blondy
- Reference Center for Muscle Channelopathies, Service de Biochimie et Centre de Génétique, APHP, Pitié-Salpêtrière Hospital, Paris, France
| | - Laurence Perrin
- Pediatrics Department, APHP, Robert-Débré Hospital, Paris, France
| | - Marianne Hezode
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Emmanuel Fournier
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France
| | - Bertrand Fontaine
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France.,Institute of Myology, Centre de Recherche en Myologie, UMRS974, Sorbonne Université - INSERM, Paris, France.,Reference Center for Muscle Channelopathies, APHP, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France
| | - Tanya Stojkovic
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France.,Institute of Myology, Centre de Recherche en Myologie, UMRS974, Sorbonne Université - INSERM, Paris, France
| | - Savine Vicart
- Reference Center for Neuromuscular Disorders, APHP, Institute of Myology, Pitié-Salpêtrière Hospital, Paris, France.,Reference Center for Muscle Channelopathies, APHP, Institut de Myologie, Pitié-Salpêtrière Hospital, Paris, France
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5
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Pisella LI, Fernandes S, Solé G, Stojkovic T, Tard C, Chanson JB, Bouhour F, Salort-Campana E, Beaudonnet G, Debergé L, Duval F, Grapperon AM, Masingue M, Nadaj-Pakleza A, Péréon Y, Audic F, Behin A, Friedman D, Magot A, Noury JB, Souvannanorath S, Wahbi K, Antoine JC, Bigaut K, Camdessanché JP, Cintas P, Debs R, Espil-Taris C, Kremer L, Kuntzer T, Laforêt P, Laugel V, Mallaret M, Michaud M, Nollet S, Svahn J, Vicart S, Villar-Quiles RN, Desguerre I, Adams D, Segovia-Kueny S, Merret G, Hammouda E, Molon A, Attarian S. A multicenter cross-sectional French study of the impact of COVID-19 on neuromuscular diseases. Orphanet J Rare Dis 2021; 16:450. [PMID: 34702344 PMCID: PMC8547719 DOI: 10.1186/s13023-021-02090-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 10/17/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Due to their health condition, patients with neuromuscular diseases (NMD) are at greater risk of developing serious complications with COVID-19. The objective of this study was to analyze the prevalence of COVID-19 among NMD patients and the risk factors for its impact and severity during the first wave of the pandemic. Clinical data were collected from NMD-COVID-19 patients, between March 25, 2020 and May 11, 2020 in an anonymous survey carried out by expert physicians from the French Health Care Network Filnemus. RESULTS Physicians reported 84 patients, including: 34 with myasthenia gravis, 27 with myopathy and 23 with neuropathy. COVID-19 had no effect on NMD for 48 (58%) patients and 48 (58%) patients developed low COVID-19 severity. COVID-19 caused the death of 9 (11%) NMD patients. Diabetic patients were at greater risk of dying. Patients with diabetes, hypertension or severe forms of NMD had a higher risk of developing a moderate or severe form of COVID-19. In our cohort, corticosteroids and other immunosuppressants were not significantly associated with higher COVID-19 severity for acquired NMD. CONCLUSION During this period, a small percentage of French NMD patients was affected by COVID-19 compared to the general French population and COVID-19 had a limited short-term effect on them. Diabetes, hypertension and a severe degree of NMD were identified as risk factors of unfavorable outcome following COVID-19. Conversely, in our cohort of patients with acquired NMD, corticosteroids or other immunosuppressants did not appear to be risk factors for more severe COVID-19.
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Affiliation(s)
| | - Sara Fernandes
- Department of Epidemiology and Health Economics, AP-HM, Marseille, France
| | - Guilhem Solé
- Department of Neurology and Neuromuscular Disorders, Reference Center for Neuromuscular Disorders AOC, University Hospitals of Bordeaux (Pellegrin University Hospital), place Amélie-Raba-Léon, 33076, Bordeaux, France
| | - Tanya Stojkovic
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Sorbonne Université, AP-HP, Hôpital Pitié-Salpêtrière, Inserm UMR_S 974, Paris, France
| | - Céline Tard
- CHU de Lille, Inserm U1171, Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Lille, France
| | - Jean-Baptiste Chanson
- Neurology Department, Reference Center for Neuromuscular Diseases 'Nord-Est-Ile de France', University Hospitals of Strasbourg, Strasbourg, France
| | - Françoise Bouhour
- ENMG Unit, Reference Center for Neuromuscular Diseases, University Hospitals of Lyon (Neurologic Hospital Pierre Wertheimer), Lyon, France
| | - Emmanuelle Salort-Campana
- Filnemus, AP-HM, Marseille, France
- Reference Center for Neuromuscular Diseases and ALS, Timone University Hospital, Aix-Marseille University, ERN-Center, Marseille, France
| | - Guillemette Beaudonnet
- Clinical Neurophysiology Unit, Reference Center for Neuromuscular Disease, University Hospital of Bicetre, Le Kremlin Bicêtre, France
| | - Louise Debergé
- Department of Neurology and Neuromuscular Disorders, Reference Center for Neuromuscular Disorders AOC, University Hospitals of Bordeaux (Pellegrin University Hospital), place Amélie-Raba-Léon, 33076, Bordeaux, France
| | - Fanny Duval
- Department of Neurology and Neuromuscular Disorders, Reference Center for Neuromuscular Disorders AOC, University Hospitals of Bordeaux (Pellegrin University Hospital), place Amélie-Raba-Léon, 33076, Bordeaux, France
| | - Aude-Marie Grapperon
- Reference Center for Neuromuscular Diseases and ALS, Timone University Hospital, Aix-Marseille University, ERN-Center, Marseille, France
| | - Marion Masingue
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Sorbonne Université, AP-HP, Hôpital Pitié-Salpêtrière, Inserm UMR_S 974, Paris, France
| | - Aleksandra Nadaj-Pakleza
- Neurology Department, Reference Center for Neuromuscular Diseases 'Nord-Est-Ile de France', University Hospitals of Strasbourg, Strasbourg, France
| | - Yann Péréon
- Reference Center for Neuromuscular Diseases, Filnemus, ERN Euro-NMD, CHU Nantes, Nantes, France
| | - Frédérique Audic
- Reference Center for Neuromuscular Diseases, Neuropediatric Unit Timone University Hospital, Marseille, France
| | - Anthony Behin
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Sorbonne Université, AP-HP, Hôpital Pitié-Salpêtrière, Inserm UMR_S 974, Paris, France
| | - Diane Friedman
- Neurology Department, Nord/Est/Île-de-France Neuromuscular Reference Center, Raymond-Poincaré Teaching Hospital, AP-HP, Garches, France
| | - Armelle Magot
- Reference Center for Neuromuscular Diseases, Filnemus, ERN Euro-NMD, CHU Nantes, Nantes, France
| | - Jean-Baptiste Noury
- Reference Center for Neuromuscular Diseases AOC, University Hospital of Brest, Brest, France
| | - Sarah Souvannanorath
- Reference Center for Neuromuscular Diseases, Henri Mondor University Hospital, Assistance Publique - Hôpitaux de Paris, Créteil, France
| | - Karim Wahbi
- AP-HP, Cochin Hospital, Cardiology Department, FILNEMUS, Reference Center for Neuromuscular Diseases Nord/Est/Île-de-France, Paris-Descartes, Sorbonne Paris Cité University, 75006, Paris, France
- INSERM Unit 970, Paris Cardiovascular Research Center (PARCC), Paris, France
| | - Jean-Christophe Antoine
- Department of Neurology, Reference Center for Neuromuscular Diseases, University Hospital of Saint-Etienne, Saint-Etienne, France
| | - Kévin Bigaut
- Neurology Department, Reference Center for Neuromuscular Diseases 'Nord-Est-Ile de France', University Hospitals of Strasbourg, Strasbourg, France
| | - Jean-Philippe Camdessanché
- Department of Neurology, Reference Center for Neuromuscular Diseases, University Hospital of Saint-Etienne, Saint-Etienne, France
| | - Pascal Cintas
- Department of Neurology, Reference Center for Neuromuscular Diseases, University Hospitals of Toulouse (Purpan Hospital), Toulouse, France
| | - Rabab Debs
- Clinical Neurophysiology Department, Hôpital Pitié-Salpêtrière, APHP Paris VI Université, Paris, France
| | - Caroline Espil-Taris
- Department of Pediatric Neurology, Neuromuscular Center, CHU Bordeaux, Bordeaux, France
| | - Laurent Kremer
- Neurology Department, Reference Center for Neuromuscular Diseases 'Nord-Est-Ile de France', University Hospitals of Strasbourg, Strasbourg, France
| | - Thierry Kuntzer
- Nerve-Muscle Unit, Neurology Service, Department of Clinical Neurosciences, Lausanne University Hospital (CHUV), University of Lausanne, Lausanne, Switzerland
| | - Pascal Laforêt
- Neurology Department, Nord/Est/Île-de-France Neuromuscular Reference Center, Raymond-Poincaré Teaching Hospital, AP-HP, Garches, France
- INSERM U1179, END-ICAP, Versailles-Saint-Quentin-en-Yvelines University, Université Paris Saclay, Montigny-le-Bretonneux, France
| | - Vincent Laugel
- Department of Pediatrics, Strasbourg University Hospital, Strasbourg Cedex, France
| | - Martial Mallaret
- Department of Neurology, Competence Center for Neuromuscular Diseases, University Hospital Centre Grenoble Alpes, CS 10217, 38043, Grenoble Cedex 9, France
| | - Maud Michaud
- Department of Neurology, Nancy University Hospital, Nancy, France
| | - Sylvain Nollet
- Clinical Neurology-Electrophysiology Department, University Hospital (CHRU) Besançon, Besançon, France
| | - Juliette Svahn
- ENMG Unit, Reference Center for Neuromuscular Diseases, University Hospitals of Lyon (Neurologic Hospital Pierre Wertheimer), Lyon, France
| | - Savine Vicart
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Sorbonne Université, AP-HP, Hôpital Pitié-Salpêtrière, Inserm UMR_S 974, Paris, France
| | - Rocio Nur Villar-Quiles
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Sorbonne Université, AP-HP, Hôpital Pitié-Salpêtrière, Inserm UMR_S 974, Paris, France
| | - Isabelle Desguerre
- Reference Center for Neuromuscular Disorders Nord/Est/Île-de-France, Pediatric Neurology Department, Necker-Enfants-Malades Hospital, AP-HP, Paris, France
| | - David Adams
- Department of Neurology, University Hospital of Bicêtre, Le Kremlin-Bicêtre, France
| | | | | | | | | | - Shahram Attarian
- Filnemus, AP-HM, Marseille, France.
- Reference Center for Neuromuscular Diseases and ALS, Timone University Hospital, Aix-Marseille University, ERN-Center, Marseille, France.
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6
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Quiles RV, Tredez G, Sternberg D, Romero N, Evangelista T, Laforêt P, Cintas P, Sole G, Sacconi S, Bendahhou S, Arzel-Hezode M, Fournier E, Fontaine B, Stojkovic T, Vicart S. CHANNELOPATHIES AND RELATED DISORDERS. Neuromuscul Disord 2021. [DOI: 10.1016/j.nmd.2021.07.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Pini J, Siciliano G, Lahaut P, Braun S, Segovia-Kueny S, Kole A, Hérnando I, Selb J, Schirinzi E, Duong T, Hogrel JY, Olmedo JJS, Vissing J, Servais L, Vincent-Genod D, Vuillerot C, Bannwarth S, Eggenspieler D, Vicart S, Diaz-Manera J, Lochmüller H, Sacconi S. E-Health & Innovation to Overcome Barriers in Neuromuscular Diseases. Report from the 1st eNMD Congress: Nice, France, March 22-23, 2019. J Neuromuscul Dis 2021; 8:743-754. [PMID: 33843694 PMCID: PMC8385527 DOI: 10.3233/jnd-210655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
By definition, neuromuscular diseases are rare and fluctuating in terms of symptoms; patients are often lately diagnosed, do not have enough information to understand their condition and be proactive in their management. Usually, insufficient resources or services are available, leading to patients' social burden. From a medical perspective, the rarity of such diseases leads to the unfamiliarity of the medical staff and caregiver and an absence of consensus in disease assessment, treatment, and management. Innovations have to be developed in response to patients' and physicians' unmet needs.It is vital to improve several aspects of patients' quality of life with a better comprehension of their disease, simplify their management and follow-up, help their caregiver, and reduce the social and economic burden for living with a rare debilitating disease. Database construction regrouping patients' data and symptoms according to specific country registration on data privacy will be critical in establishing a clear consensus on neuromuscular disease treatment.Clinicians also need technological innovations to help them recognize neuromuscular diseases, find the best therapeutic approach based on medical consensus, and tools to follow patients' states regularly. Diagnosis also has to be improved by implementing automated systems to analyze a considerable amount of data, representing a significant step forward to accelerate the diagnosis and the patients' follow up. Further, the development of new tools able to precisely measure specific outcomes reliably is of the matter of importance in clinical trials to assess the efficacy of a newly developed compound.In this context, creation of an expert community is essential to communicate and share ideas. To this end, 97 clinicians, healthcare professionals, researchers, and representatives of private companies from 9 different countries met to discuss the new perspective and challenges to develop and implement innovative tools in the field of neuromuscular diseases.
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Affiliation(s)
- Jonathan Pini
- Université Côte d'Azur (UCA), Centre Hospitalier Universitaire de Nice, Peripheral Nervous System and Muscle Department, Rare Neuromuscular Disease Reference Center, ERN-Euro-NMD, Nice, France
| | - Gabriele Siciliano
- Neurological Clinic, Department of Clinical and Experimental Medicine, Ospedale Santa Chiara, University of Pisa, Pisa, Italy
| | - Pauline Lahaut
- Université Côte d'Azur (UCA), Centre Hospitalier Universitaire de Nice, Peripheral Nervous System and Muscle Department, Rare Neuromuscular Disease Reference Center, ERN-Euro-NMD, Nice, France
| | | | | | - Anna Kole
- Public Health Policy Director Rare 2030 Lead EURORDIS
| | | | - Julij Selb
- University Clinic Golnik, Golnik, Slovenia -Medical consultant Parsek, Vienna, Austria
| | - Erika Schirinzi
- Neurological Clinic, Department of Clinical and Experimental Medicine, Ospedale Santa Chiara, University of Pisa, Pisa, Italy
| | - Tina Duong
- Department of Neurology Stanford University, Palo Alto, CA, USA
| | - Jean-Yves Hogrel
- Neuromuscular Physiology and Evaluation Lab, Neuromuscular Investigation Centre, Institute of Myology, Paris, France
| | - José Javier Serrano Olmedo
- Laboratory of Bioinstrumentation and Nanomedicine, Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Networking Center for Biomedical Research on Bioengineering, Biomaterials and Nanomedicine, Madrid, Spain.,Escuela Técnica Superior de Ingenieros de Telecomunicación, Madrid, Spain
| | - John Vissing
- Copenhagen Neuromuscular Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Laurent Servais
- MDUK Oxford Neuromuscular Center Department of Pediatrics University of Oxford, Oxford, UK.,Division of Child Neurology Reference Center for Neuromuscular Disease, Centre Hospitalier Régional de Références des Maladies Neuromusculaires, Department of Paediatrics, University, Oxford, UK
| | | | - Carole Vuillerot
- Neuron Interaction Team, NeuroMyogène Institute, Lyon University, Lyon, France
| | - Sylvie Bannwarth
- Department of Medical Genetics, National Center for Mitochondrial Diseases, Nice University Hospital, Nice, France.,Institute for Research on Cancer and Aging of Nice (IRCAN), Faculty of Medicine, Université Côte D'Azur (UCA), Nice, France
| | | | - Savine Vicart
- Channelopahies Reference Center, Service of Neuro-Myology, University Hospital Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Jordi Diaz-Manera
- John Walton Muscular Dystrophy Research Center, Newcastle University, Newcastle, UK.,Neurology department. Hospital de la Santa Creu I Sant Pau, Barcelona, Spain.,Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Spain
| | | | - Hanns Lochmüller
- Childrens Hospital of Eastern Ontario Research Institute; Division of Neurology, Department of Medicine, The Ottawa Hospital; and Brain and Mind Research Institute, University of Ottawa, Ottawa, Canada.,Department of Neuropediatrics and Muscle Disorders, Medical Center -University of Freiburg, Faculty of Medicine, Freiburg, Germany.,Centro Nacional de Análisis Genómico (CNAG-CRG), Center for Genomic Regulation, Barcelona Institute of Science and Technology (BIST), Barcelona, Catalonia, Spain
| | - Sabrina Sacconi
- Université Côte d'Azur (UCA), Centre Hospitalier Universitaire de Nice, Peripheral Nervous System and Muscle Department, Rare Neuromuscular Disease Reference Center, ERN-Euro-NMD, Nice, France.,Institute for Research on Cancer and Aging of Nice (IRCAN), Faculty of Medicine, Université Côte D'Azur (UCA), Nice, France.,Fédération Hospitalo-Universitaire Oncoage, Centre Hospitalier Universitaire de Nice, Université Côte d'Azur (UCA), Nice, France
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8
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Vicart S, Franques J, Bouhour F, Magot A, Péréon Y, Sacconi S, Nadaj-Pakleza A, Behin A, Zahr N, Hézode M, Fournier E, Payan C, Lacomblez L, Fontaine B. Efficacy and safety of mexiletine in non-dystrophic myotonias: A randomised, double-blind, placebo-controlled, cross-over study. Neuromuscul Disord 2021; 31:1124-1135. [PMID: 34702654 DOI: 10.1016/j.nmd.2021.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 06/11/2021] [Accepted: 06/22/2021] [Indexed: 11/30/2022]
Abstract
The MYOMEX study was a multicentre, randomised, double-blind, placebo-controlled, cross-over study aimed to compare the effects of mexiletine vs. placebo in patients with myotonia congenita (MC) and paramyotonia congenita (PC). The primary endpoint was the self-reported score of stiffness severity on a 100 mm visual analogic scale (VAS). Mexiletine treatment started at 200 mg/day and was up-titrated by 200 mg increment each three days to reach a maximum dose of 600 mg/day for total treatment duration of 18 days for each cross-over period. The modified intent-to-treat population included 25 patients (13 with MC and 12 with PC; mean age, 43.0 years; male, 68.0%). The median VAS score for mexiletine was 71.0 at baseline and decreased to 16.0 at the end of the treatment while the score did not change for placebo (81.0 at baseline vs. 78.0 at end of treatment). A mixed effects linear model analysis on ranked absolute changes showed a significant effect of treatment (p < 0.001). The overall score of the Individualized Neuromuscular Quality of Life questionnaire (INQoL) was significantly improved (p < 0.001). No clinically significant adverse events were reported. In conclusion, mexiletine improved stiffness and quality of life in patients with nondystrophic myotonia and was well tolerated.
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Affiliation(s)
- Savine Vicart
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, INSERM, Service of Neuro-Myology, Muscle Channelopathies Reference Center and UMR 974, Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France.
| | - Jérôme Franques
- Assistance Publique-Hôpitaux de Marseille, Department of Neurology and Neuromuscular Diseases, La Timone Hospital, Marseille, France
| | - Françoise Bouhour
- Electroneuromyography and Neuromuscular Disorders Department, Hospices Civils de Lyon, University Hospital of Lyon, France
| | - Armelle Magot
- Reference Centre for Neuromuscular disorders AOC, University Hospital, Hôtel-Dieu, Nantes, France
| | - Yann Péréon
- Reference Centre for Neuromuscular disorders AOC, University Hospital, Hôtel-Dieu, Nantes, France
| | - Sabrina Sacconi
- Université Côte d'Azur, Peripheral Nervous System & Muscle Department, Pasteur 2 Hospital, Centre Hospitalier Universitaire de Nice, Nice, France
| | - Aleksandra Nadaj-Pakleza
- Reference Centre for Neuromuscular disorders AOC, Neurology Department, University Hospital of Angers, Angers, France
| | - Anthony Behin
- Assistance Publique-Hôpitaux de Paris, Service of Neuro-Myology, Reference Centre for Neuromuscular disorders NEIdF, University Hospital Pitié-Salpêtrière, Paris, France
| | - Noël Zahr
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Pharmacology Department, University Hospital Pitié-Salpêtrière, Paris, France
| | - Marianne Hézode
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Department of Clinical Neurophysiology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Emmanuel Fournier
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Department of Clinical Neurophysiology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Christine Payan
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Pharmacology Department, University Hospital Pitié-Salpêtrière, Paris, France
| | - Lucette Lacomblez
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Pharmacology Department, University Hospital Pitié-Salpêtrière, Paris, France; Assistance Publique-Hôpitaux de Paris, Sorbonne Université, INSERM U 1422, Neurology Department, University Hospital Pitié-Salpêtrière, Paris, France
| | - Bertrand Fontaine
- Assistance Publique-Hôpitaux de Paris, Sorbonne Université, INSERM, Service of Neuro-Myology, Muscle Channelopathies Reference Center and UMR 974, Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
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9
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Sterlin D, Larsen M, Fadlallah J, Parizot C, Vignes M, Autaa G, Dorgham K, Juste C, Lepage P, Aboab J, Vicart S, Maillart E, Gout O, Lubetzki C, Deschamps R, Papeix C, Gorochov G. Perturbed Microbiota/Immune Homeostasis in Multiple Sclerosis. Neurol Neuroimmunol Neuroinflamm 2021; 8:8/4/e997. [PMID: 33975914 PMCID: PMC8114833 DOI: 10.1212/nxi.0000000000000997] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 03/09/2021] [Indexed: 12/21/2022]
Abstract
Objective Based on animal models and human studies, there is now strong suspicion that host/microbiota mutualism in the context of gut microbial dysbiosis could influence immunity and multiple sclerosis (MS) evolution. Our goal was to seek evidence of deregulated microbiota-induced systemic immune responses in patients with MS. Methods We investigated gut and systemic commensal-specific antibody responses in healthy controls (n = 32), patients with relapsing-remitting MS (n = 30), and individuals with clinically isolated syndromes (CISs) (n = 15). Gut microbiota composition and diversity were compared between controls and patients by analysis of 16S ribosomal ribonucleic acid (rRNA) sequencing. Autologous microbiota and cultivable bacterial strains were used in bacterial flow cytometry assays to quantify autologous serum IgG and secretory IgA responses to microbiota. IgG-bound bacteria were sorted by flow cytometry and identified using 16S rRNA sequencing. Results We show that commensal-specific gut IgA responses are drastically reduced in patients with severe MS, disease severity being correlated with the IgA-coated fecal microbiota fraction (r = −0.647, p < 0.0001). At the same time, IgA-unbound bacteria elicit qualitatively broad and quantitatively increased serum IgG responses in patients with MS and CIS compared with controls (4.1% and 2.5% vs 1.9%, respectively, p < 0.001). Conclusions Gut and systemic microbiota/immune homeostasis are perturbed in MS. Our results argue that defective IgA responses in MS are linked to a breakdown of systemic tolerance to gut microbiota leading to an enhanced triggering of systemic IgG immunity against gut commensals occurring early in MS.
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Affiliation(s)
- Delphine Sterlin
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Martin Larsen
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Jehane Fadlallah
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Christophe Parizot
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Marina Vignes
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Gaëlle Autaa
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Karim Dorgham
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Catherine Juste
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Patricia Lepage
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Jennifer Aboab
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Savine Vicart
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Elisabeth Maillart
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Olivier Gout
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Catherine Lubetzki
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Romain Deschamps
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Caroline Papeix
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Guy Gorochov
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France.
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10
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Desaphy JF, Altamura C, Vicart S, Fontaine B. Targeted Therapies for Skeletal Muscle Ion Channelopathies: Systematic Review and Steps Towards Precision Medicine. J Neuromuscul Dis 2021; 8:357-381. [PMID: 33325393 PMCID: PMC8203248 DOI: 10.3233/jnd-200582] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Skeletal muscle ion channelopathies include non-dystrophic myotonias (NDM), periodic paralyses (PP), congenital myasthenic syndrome, and recently identified congenital myopathies. The treatment of these diseases is mainly symptomatic, aimed at reducing muscle excitability in NDM or modifying triggers of attacks in PP. OBJECTIVE This systematic review collected the evidences regarding effects of pharmacological treatment on muscle ion channelopathies, focusing on the possible link between treatments and genetic background. METHODS We searched databases for randomized clinical trials (RCT) and other human studies reporting pharmacological treatments. Preclinical studies were considered to gain further information regarding mutation-dependent drug effects. All steps were performed by two independent investigators, while two others critically reviewed the entire process. RESULTS For NMD, RCT showed therapeutic benefits of mexiletine and lamotrigine, while other human studies suggest some efficacy of various sodium channel blockers and of the carbonic anhydrase inhibitor (CAI) acetazolamide. Preclinical studies suggest that mutations may alter sensitivity of the channel to sodium channel blockers in vitro, which has been translated to humans in some cases. For hyperkalemic and hypokalemic PP, RCT showed efficacy of the CAI dichlorphenamide in preventing paralysis. However, hypokalemic PP patients carrying sodium channel mutations may have fewer benefits from CAI compared to those carrying calcium channel mutations. Few data are available for treatment of congenital myopathies. CONCLUSIONS These studies provided limited information about the response to treatments of individual mutations or groups of mutations. A major effort is needed to perform human studies for designing a mutation-driven precision medicine in muscle ion channelopathies.
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Affiliation(s)
- Jean-François Desaphy
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Concetta Altamura
- Department of Biomedical Sciences and Human Oncology, School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Savine Vicart
- Sorbonne Université, INSERM, Assistance Publique Hôpitaux de Paris, Centre de Recherche en Myologie-UMR 974, Reference center in neuro-muscular channelopathies, Institute of Myology, Hôpital Universitaire Pitié-Salpêtrière, Paris, France
| | - Bertrand Fontaine
- Sorbonne Université, INSERM, Assistance Publique Hôpitaux de Paris, Centre de Recherche en Myologie-UMR 974, Reference center in neuro-muscular channelopathies, Institute of Myology, Hôpital Universitaire Pitié-Salpêtrière, Paris, France
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11
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Stunnenberg BC, LoRusso S, Arnold WD, Barohn RJ, Cannon SC, Fontaine B, Griggs RC, Hanna MG, Matthews E, Meola G, Sansone VA, Trivedi JR, van Engelen BG, Vicart S, Statland JM. Guidelines on clinical presentation and management of nondystrophic myotonias. Muscle Nerve 2020; 62:430-444. [PMID: 32270509 PMCID: PMC8117169 DOI: 10.1002/mus.26887] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/01/2020] [Accepted: 04/04/2020] [Indexed: 12/26/2022]
Abstract
The nondystrophic myotonias are rare muscle hyperexcitability disorders caused by gain-of-function mutations in the SCN4A gene or loss-of-function mutations in the CLCN1 gene. Clinically, they are characterized by myotonia, defined as delayed muscle relaxation after voluntary contraction, which leads to symptoms of muscle stiffness, pain, fatigue, and weakness. Diagnosis is based on history and examination findings, the presence of electrical myotonia on electromyography, and genetic confirmation. In the absence of genetic confirmation, the diagnosis is supported by detailed electrophysiological testing, exclusion of other related disorders, and analysis of a variant of uncertain significance if present. Symptomatic treatment with a sodium channel blocker, such as mexiletine, is usually the first step in management, as well as educating patients about potential anesthetic complications.
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Affiliation(s)
- Bas C. Stunnenberg
- Department of Neurology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Samantha LoRusso
- Department of Neurology, Ohio State University Wexner Medical Center, Columbus, Ohio
| | - W. David Arnold
- Department of Neurology, Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Richard J. Barohn
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas
| | - Stephen C. Cannon
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Bertrand Fontaine
- Assistance Publique-Hôpitaix de Paris, Sorbonne Université, INSERM, Service of Neuro-Myology and UMR 974, Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Robert C. Griggs
- Department of Neurology, University of Rochester, Rochester, New York
| | - Michael G. Hanna
- MRC Centre for Neuromuscular Diseases, Department of Neuromuscular diseases, UCL Queen Square Institute of Neurology, United Kingdom
| | - Emma Matthews
- MRC Centre for Neuromuscular Diseases, Department of Neuromuscular diseases, UCL Queen Square Institute of Neurology, United Kingdom
| | - Giovanni Meola
- Department of Neurorehabilitation Sciences, Casa Cura Policlinico, Milan, Italy
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
| | - Valeria A. Sansone
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
- Neurorehabilitation Unit, University of Milan, NEuroMuscular Omnicentre (NEMO), Fondazione Serena Onlus, Milan, Italy
| | - Jaya R. Trivedi
- Department of Neurology and Neurotherapeutics, UT Southwestern Medical Center, Dallas, Texas
| | | | - Savine Vicart
- Assistance Publique-Hôpitaix de Paris, Sorbonne Université, INSERM, Service of Neuro-Myology and UMR 974, Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Jeffrey M. Statland
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas
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12
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Kubota T, Wu F, Vicart S, Nakaza M, Sternberg D, Watanabe D, Furuta M, Kokunai Y, Abe T, Kokubun N, Fontaine B, Cannon SC, Takahashi MP. Hypokalaemic periodic paralysis with a charge-retaining substitution in the voltage sensor. Brain Commun 2020; 2:fcaa103. [PMID: 33005891 PMCID: PMC7519726 DOI: 10.1093/braincomms/fcaa103] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 05/26/2020] [Accepted: 06/02/2020] [Indexed: 01/06/2023] Open
Abstract
Familial hypokalaemic periodic paralysis is a rare skeletal muscle disease caused by the dysregulation of sarcolemmal excitability. Hypokalaemic periodic paralysis is characterized by repeated episodes of paralytic attacks with hypokalaemia, and several variants in CACNA1S coding for CaV1.1 and SCN4A coding for NaV1.4 have been established as causative mutations. Most of the mutations are substitutions to a non-charged residue, from the positively charged arginine (R) in transmembrane segment 4 (S4) of a voltage sensor in either CaV1.1 or NaV1.4. Mutant channels have aberrant leak currents called 'gating pore currents', and the widely accepted consensus is that this current is the essential pathological mechanism that produces susceptibility to anomalous depolarization and failure of muscle excitability during a paralytic attack. Here, we have identified five hypokalaemic periodic paralysis cases from two different ethnic backgrounds, Japanese and French, with charge-preserving substitutions in S4 from arginine, R, to lysine, K. An R to K substitution has not previously been reported for any other hypokalaemic periodic paralysis families. One case is R219K in NaV1.4, which is located at the first charge in S4 of Domain I. The other four cases all have R897K in CaV1.1, which is located at the first charge in S4 of Domain III. Gating pore currents were not detected in expression studies of CaV1.1-R897K. NaV1.4-R219K mutant channels revealed a distinct, but small, gating pore current. Simulation studies indicated that the small-amplitude gating pore current conducted by NaV1.4-R219K is not likely to be sufficient to be a risk factor for depolarization-induced paralytic attacks. Our rare cases with typical hypokalaemic periodic paralysis phenotypes do not fit the canonical view that the essential defect in hypokalaemic periodic paralysis mutant channels is the gating pore current and raise the possibility that hypokalaemic periodic paralysis pathogenesis might be heterogeneous and diverse.
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Affiliation(s)
- Tomoya Kubota
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637, USA
| | - Fenfen Wu
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Savine Vicart
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Maki Nakaza
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan
| | - Damien Sternberg
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Daisuke Watanabe
- Department of Neurology, National Hospital Organization Hakone Hospital, Odawara, Japan
| | - Mitsuru Furuta
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Department of Neurology, Kansai Rosai Hospital, Amagasaki, Hyogo, Japan
| | - Yosuke Kokunai
- Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.,Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Tatsuya Abe
- Department of Neurology, National Hospital Organization Hakone Hospital, Odawara, Japan
| | - Norito Kokubun
- Department of Neurology, Dokkyo Medical University, Tochigi, Japan
| | - Bertrand Fontaine
- Sorbonne Université, INSERM, Assistance Publique -Hôpitaux de Paris, Center of Research in Myology-UMR 974, Service of Neuro-Myology (CMR Muscle Channelopathies), Institute of Myology, University Hospital Pitié-Salpêtrière, Paris, France
| | - Stephen C Cannon
- Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Masanori P Takahashi
- Division of Health Sciences, Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7, Yamadaoka, Suita, Osaka, 5650871, Japan.,Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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13
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Molenaar JP, Verhoeven JI, Rodenburg RJ, Kamsteeg EJ, Erasmus CE, Vicart S, Behin A, Bassez G, Magot A, Péréon Y, Brandom BW, Guglielmi V, Vattemi G, Chevessier F, Mathieu J, Franques J, Suetterlin K, Hanna MG, Guyant-Marechal L, Snoeck MM, Roberts ME, Kuntzer T, Fernandez-Torron R, Martínez-Arroyo A, Seeger J, Kusters B, Treves S, van Engelen BG, Eymard B, Voermans NC, Sternberg D. Clinical, morphological and genetic characterization of Brody disease: an international study of 40 patients. Brain 2020; 143:452-466. [PMID: 32040565 PMCID: PMC7009512 DOI: 10.1093/brain/awz410] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 10/30/2019] [Accepted: 11/16/2019] [Indexed: 11/17/2022] Open
Abstract
Brody disease is an autosomal recessive myopathy characterized by exercise-induced muscle stiffness due to mutations in the ATP2A1 gene. Almost 50 years after the initial case presentation, only 18 patients have been reported and many questions regarding the clinical phenotype and results of ancillary investigations remain unanswered, likely leading to incomplete recognition and consequently under-diagnosis. Additionally, little is known about the natural history of the disorder, genotype-phenotype correlations, and the effects of symptomatic treatment. We studied the largest cohort of Brody disease patients to date (n = 40), consisting of 22 new patients (19 novel mutations) and all 18 previously published patients. This observational study shows that the main feature of Brody disease is an exercise-induced muscle stiffness of the limbs, and often of the eyelids. Onset begins in childhood and there was no or only mild progression of symptoms over time. Four patients had episodes resembling malignant hyperthermia. The key finding at physical examination was delayed relaxation after repetitive contractions. Additionally, no atrophy was seen, muscle strength was generally preserved, and some patients had a remarkable athletic build. Symptomatic treatment was mostly ineffective or produced unacceptable side effects. EMG showed silent contractures in approximately half of the patients and no myotonia. Creatine kinase was normal or mildly elevated, and muscle biopsy showed mild myopathic changes with selective type II atrophy. Sarcoplasmic/endoplasmic reticulum Ca2+ ATPase (SERCA) activity was reduced and western blot analysis showed decreased or absent SERCA1 protein. Based on this cohort, we conclude that Brody disease should be considered in cases of exercise-induced muscle stiffness. When physical examination shows delayed relaxation, and there are no myotonic discharges at electromyography, we recommend direct sequencing of the ATP2A1 gene or next generation sequencing with a myopathy panel. Aside from clinical features, SERCA activity measurement and SERCA1 western blot can assist in proving the pathogenicity of novel ATP2A1 mutations. Finally, patients with Brody disease may be at risk for malignant hyperthermia-like episodes, and therefore appropriate perioperative measures are recommended. This study will help improve understanding and recognition of Brody disease as a distinct myopathy in the broader field of calcium-related myopathies.
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Affiliation(s)
- Joery P Molenaar
- Department of Neurology, Donders Centre for Medical Neuroscience, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Jamie I Verhoeven
- Department of Neurology, Donders Centre for Medical Neuroscience, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Richard J Rodenburg
- Department of Pediatrics, Translational Metabolic Laboratory, Radboud Center for Mitochondrial Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Erik J Kamsteeg
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Corrie E Erasmus
- Department of Neurology, Donders Centre for Medical Neuroscience, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Savine Vicart
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Anthony Behin
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Guillaume Bassez
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Armelle Magot
- CHU Nantes, Centre de Référence Maladies Neuromusculaires AOC, Nantes, France
| | - Yann Péréon
- CHU Nantes, Centre de Référence Maladies Neuromusculaires AOC, Nantes, France
| | - Barbara W Brandom
- Department of Anesthesiology, Children's Hospital, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Valeria Guglielmi
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Clinical Neurology, University of Verona, Verona, Italy
| | - Gaetano Vattemi
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Clinical Neurology, University of Verona, Verona, Italy
| | | | - Jean Mathieu
- Neuromuscular Clinic, Centre de Réadaptation en Déficience Physique de Jonquière, Jonquière, Québec, Canada
| | - Jérôme Franques
- Centre de référence des maladies neuromusculaires et de la SLA, hôpital La Timone, AP-HM, Aix-Marseille université, avenue Jean-Moulin, Marseille, France
| | - Karen Suetterlin
- MRC Centre for Neuromuscular Diseases, National Hospital for Neurology and Neurosurgery, Queen Square, London, UK
| | - Michael G Hanna
- MRC Centre for Neuromuscular Diseases, National Hospital for Neurology and Neurosurgery, Queen Square, London, UK
| | | | - Marc M Snoeck
- Department of Anaesthesiology, Canisius-Wilhelmina Ziekenhuis, Nijmegen, The Netherlands
| | - Mark E Roberts
- Department of Neurology, Salford Royal NHS Foundation Trust, Greater Manchester, UK
| | - Thierry Kuntzer
- Nerve-Muscle Unit, Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - Roberto Fernandez-Torron
- Neuromuscular Area, Biodonostia Health Research Institute, Department of Neurology, University Hospital Donostia, CIBERNED, San Sebastián, Spain
| | | | - Juergen Seeger
- Sozialpädiatrisches Zentrum Frankfurt Mitte, Neuromuskulares Zentrum, Frankfurt, Germany
| | - Benno Kusters
- Department of Pathology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Susan Treves
- Departments of Anesthesia and Biomedicine, Basel University and Basel University Hospital, Basel, Switzerland.,Department of Life Sciences, University of Ferrara, Ferrara, Italy
| | - Baziel G van Engelen
- Department of Neurology, Donders Centre for Medical Neuroscience, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Bruno Eymard
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
| | - Nicol C Voermans
- Department of Neurology, Donders Centre for Medical Neuroscience, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Damien Sternberg
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
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14
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Masingue M, Arzel M, Sternberg D, Stojkovic T, Behin A, Bassez G, Vicart S, Péréon Y, Kuntzer T, Eymard B, Fournier E. P.100Pseudo-increment at repetitive nerve stimulation (Arzel's sign): a new tool for Brody myopathy diagnosis. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Cattan S, Papeix C, Grabli D, Casez O, Shor N, Bustuchina Vlaicu M, Vicart S, Louapre C, Maillart E. Early radiological features of severe longitudinally extensive transverse myelitis over time. J Neurol Sci 2019; 400:7-9. [PMID: 30878638 DOI: 10.1016/j.jns.2019.01.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/23/2019] [Accepted: 01/25/2019] [Indexed: 10/27/2022]
Affiliation(s)
- Samuel Cattan
- Department of Neurology, AP-HP, Pitié-Salpêtrière Hospital, Paris, France.
| | - Caroline Papeix
- Department of Neurology, AP-HP, Pitié-Salpêtrière Hospital, Paris, France
| | - David Grabli
- Sorbonne Université, INSERM U 1127, CNRS UMR 7225, Institut du Cerveau et de la Moelle, AP-HP, Pitié-Salpêtrière Hospital, Paris, France
| | - Olivier Casez
- Pathologies inflammatoires du système nerveux, Clinique de Neurologie, CHU Grenoble Alpes, Grenoble, France
| | - Natalia Shor
- Department of Neuroradiology, APHP, Pitié-Salpêtrière Hospital, Paris, France
| | | | - Savine Vicart
- Department of Neurology, AP-HP, Pitié-Salpêtrière Hospital, Paris, France
| | - Céline Louapre
- Department of Neurology, AP-HP, Pitié-Salpêtrière Hospital, Paris, France
| | - Elisabeth Maillart
- Department of Neurology, AP-HP, Pitié-Salpêtrière Hospital, Paris, France
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16
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Kokunai Y, Dalle C, Vicart S, Sternberg D, Pouliot V, Bendahhou S, Fournier E, Chahine M, Fontaine B, Nicole S. A204E mutation in Na v1.4 DIS3 exerts gain- and loss-of-function effects that lead to periodic paralysis combining hyper- with hypo-kalaemic signs. Sci Rep 2018; 8:16681. [PMID: 30420713 PMCID: PMC6232142 DOI: 10.1038/s41598-018-34750-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 10/25/2018] [Indexed: 12/11/2022] Open
Abstract
Periodic paralyses (PP) are characterized by episodic muscle weakness and are classified into the distinct hyperkalaemic (hyperPP) and hypokalaemic (hypoPP) forms. The dominantly-inherited form of hyperPP is caused by overactivity of Nav1.4 - the skeletal muscle voltage-gated sodium channel. Familial hypoPP results from a leaking gating pore current induced by dominant mutations in Nav1.4 or Cav1.1, the skeletal muscle voltage-gated calcium channel. Here, we report an individual with clinical signs of hyperPP and hypokalaemic episodes of muscle paralysis who was heterozygous for the novel p.Ala204Glu (A204E) substitution located in one region of Nav1.4 poor in disease-related variations. A204E induced a significant decrease of sodium current density, increased the window current, enhanced fast and slow inactivation of Nav1.4, and did not cause gating pore current in functional analyses. Interestingly, the negative impact of A204E on Nav1.4 activation was strengthened in low concentration of extracellular K+. Our data prove the existence of a phenotype combining signs of hyperPP and hypoPP due to dominant Nav1.4 mutations. The hyperPP component would result from gain-of-function effects on Nav1.4 and the hypokalemic episodes of paralysis from loss-of-function effects strengthened by low K+. Our data argue for a non-negligible role of Nav1.4 loss-of-function in familial hypoPP.
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Affiliation(s)
- Yosuke Kokunai
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France
| | - Carine Dalle
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France
| | - Savine Vicart
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France
- AP-HP, Hôpital Universitaire Pitié-Salpétrière, National Reference Center for Channelopathies, F-75013, Paris, France
| | - Damien Sternberg
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France
- AP-HP, Hôpital Universitaire Pitié-Salpétrière, National Reference Center for Channelopathies, F-75013, Paris, France
| | - Valérie Pouliot
- Centre de recherche CERVO, Institut Universitaire en Santé Mentale de Québec, Quebec City, QC, G1J 2G3, Canada
- Department of Medicine, Université Laval, Quebec City, QC, G1K 7P4, Canada
| | - Said Bendahhou
- CNRS UMR7370, LP2M, Labex ICST, University Nice Sophia-Antipolis, Faculté de Médecine, Nice, France
| | - Emmanuel Fournier
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France
- AP-HP, Hôpital Universitaire Pitié-Salpétrière, National Reference Center for Channelopathies, F-75013, Paris, France
| | - Mohamed Chahine
- Centre de recherche CERVO, Institut Universitaire en Santé Mentale de Québec, Quebec City, QC, G1J 2G3, Canada
- Department of Medicine, Université Laval, Quebec City, QC, G1K 7P4, Canada
| | - Bertrand Fontaine
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France.
- AP-HP, Hôpital Universitaire Pitié-Salpétrière, National Reference Center for Channelopathies, F-75013, Paris, France.
| | - Sophie Nicole
- Inserm U1127, CNRS UMR 7225, Sorbonne Universités, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle épinière (ICM), F-75013, Paris, France.
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17
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Clarençon F, Shotar E, Boch AL, Rolla-Bigliani C, Al Raasi A, Grabli D, Vicart S, Sourour NA, Chiras J. Spinal Angiogram: A Treacherous Criterion Standard…. AJNR Am J Neuroradiol 2018; 39:E41-E44. [PMID: 29419399 DOI: 10.3174/ajnr.a5470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- F Clarençon
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France.,Paris VI University, Pierre et Marie Curie Paris, France
| | - E Shotar
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France.,Paris VI University, Pierre et Marie Curie Paris, France
| | - A-L Boch
- Department of Neurosurgery Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - C Rolla-Bigliani
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - A Al Raasi
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - D Grabli
- Paris VI University, Pierre et Marie Curie Paris, France.,Department of Neurology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - S Vicart
- Department of Neurology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - N-A Sourour
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France
| | - J Chiras
- Department of Neuroradiology Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris Paris, France.,Paris VI University, Pierre et Marie Curie Paris, France
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Chahine M, Poulin H, Gosselin-Badaroudine P, Vicart S, Habbout K, Sternberg D, Giuliano S, Fontaine B, Bendahhou S, Nicole S. Biophysical Characterization of Two NaV1.4 Mutations Making a Clinical Overlap between the Myotonia-Hyperkalemic and Hypokalemic Periodic Paralysis Clusters of Disorders. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.3414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Kokunai Y, Vicart S, Dalle C, Sternberg D, Fontaine B, Nicole S. A case of periodic paralysis with hypo and hyperkalemic characteristics. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Molenaar J, Verhoeven J, Voermans N, Mathieu J, Vattemi G, Franques J, Kuntzer T, Guyant-Marechal L, Vicart S, Behin A, Erasmus C, Brandom B, Matthews E, Suetterlin K, van Engelen B, Sternberg D, Eymard B. The Brody disease cohort study: clarification of the phenotype. Neuromuscul Disord 2017. [DOI: 10.1016/j.nmd.2017.06.257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Motte MBDL, Amador MDM, Vicart S, Bourgeois D, Lubetzki C, Catala M. Hypersignaux de la substance blanche et microdélétion 6p25 : à propos d’un cas. Rev Neurol (Paris) 2016. [DOI: 10.1016/j.neurol.2016.01.301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Poulin H, Gosselin-Badaroudine P, Habbout K, Vicart S, Syternberg D, Giuliano S, Nicole S, Bendahhou S, Chahine M. Biophysical Characterization of Two Nav1.4 Mutations Identified in Patients with Cold-Induced Myotonia and Periodic Paralysis. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lion-Francois L, Mignot C, Vicart S, Manel V, Sternberg D, Landrieu P, Lesca G, Broussolle E, Billette de Villemeur T, Napuri S, des Portes V, Fontaine B. Severe neonatal episodic laryngospasm due to de novo SCN4A mutations: A new treatable disorder. Neurology 2010; 75:641-5. [DOI: 10.1212/wnl.0b013e3181ed9e96] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Arzel-hézode M, Sternberg D, Tabti N, Vicart S, Goizet C, Eymard B, Fontaine B, Fournier E. Homozygosity for dominant mutations increases severity of muscle channelopathies. Muscle Nerve 2010; 41:470-7. [DOI: 10.1002/mus.21520] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Sacconi S, Simkin D, Arrighi N, Chapon F, Larroque MM, Vicart S, Sternberg D, Fontaine B, Barhanin J, Desnuelle C, Bendahhou S. Mechanisms underlying Andersen's syndrome pathology in skeletal muscle are revealed in human myotubes. Am J Physiol Cell Physiol 2009; 297:C876-85. [DOI: 10.1152/ajpcell.00519.2008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Andersen's syndrome is a rare disorder that has been defined with a triad: periodic paralysis, cardiac arrhythmia, and development anomalies. Muscle weakness has been reported in two-thirds of the patients. KCNJ2 remains the only gene linked to Andersen's syndrome; this gene encodes for the α-subunit of the strong inward-rectifier K+ channel Kir2.1. Several studies have shown that Andersen's syndrome mutations lead to a loss of function of the K+ channel activity in vitro. However, ex vivo studies on isolated patient muscle tissue have not been reported. We have performed muscle biopsies of controls and patients presenting with clinically and genetically defined Andersen's syndrome disorder. Myoblasts were cultured and characterized morphologically and functionally using the whole cell patch-clamp technique. No morphological difference was observed between Andersen's syndrome and control myoblasts at each passage of the cell culture. Cellular proliferation and viability were quantified in parallel with direct cell counts and showed no difference between control and Andersen's syndrome patients. Moreover, our data show no significant difference in myoblast fusion index among Andersen's syndrome and control patients. Current recordings carried out on myotubes revealed the absence of an inwardly rectifying Ba2+-sensitive current in affected patient cells. One consequence of the Ik1 current loss in Andersen's syndrome myotubes is a shift of the resting membrane potential toward depolarizing potentials. Our data describe for the first time the functional consequences of Andersen's syndrome mutations ex vivo and provide clues to the K+ channel pathophysiology in skeletal muscle.
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Affiliation(s)
- S. Sacconi
- Centre Hospitalier Universitaire of Nice, Centre de Référence Maladies Neuromusculaires et Sclérose Latérale Amyotrophique, Institut National de la Santé et de la Recherche Médicale Unité 638, Institut Fédératif de Recherche 50, Nice
| | - D. Simkin
- University of Nice Sophia Antipolis, Transport Ionique Aspects Normaux et Pathologiques, Formation de Recherche en Evolution 3093 Centre National de la Recherche Scientifique, Parc Valrose, Nice
| | - N. Arrighi
- Centre Hospitalier Universitaire of Nice, Centre de Référence Maladies Neuromusculaires et Sclérose Latérale Amyotrophique, Institut National de la Santé et de la Recherche Médicale Unité 638, Institut Fédératif de Recherche 50, Nice
| | - F. Chapon
- Centre Hospitalier Universitaire of Caen, Service de Neurologie et Laboratoire de Neuropathologie, Caen
| | - M. M. Larroque
- University of Nice Sophia Antipolis, Institut de Pharmacologie Moléculaire et Cellulaire, Unité Mixte de Recherche 6097 Centre National de la Recherche Scientifique, Sophia Antipolis, Valbonne
| | - S. Vicart
- Centre de Référence des Canalopathies Musculaires, Fédération des Maladies du Système Nerveux; Université Pierre et Marie Curie, Unité Mixte de Recherche S546; Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche 546, Paris; and
| | - D. Sternberg
- Biochemistry and Genetics, Hôpital Pitié-Salpêtrière, Assistance Publique, Hôpitaux de Paris, and Unité Mixte de Recherche 546, Université Pierre et Marie Curie and Institut National de la Santé et de la Recherche Médicale, Paris, France
| | - B. Fontaine
- Centre de Référence des Canalopathies Musculaires, Fédération des Maladies du Système Nerveux; Université Pierre et Marie Curie, Unité Mixte de Recherche S546; Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche 546, Paris; and
| | - J. Barhanin
- University of Nice Sophia Antipolis, Transport Ionique Aspects Normaux et Pathologiques, Formation de Recherche en Evolution 3093 Centre National de la Recherche Scientifique, Parc Valrose, Nice
| | - C. Desnuelle
- Centre Hospitalier Universitaire of Nice, Centre de Référence Maladies Neuromusculaires et Sclérose Latérale Amyotrophique, Institut National de la Santé et de la Recherche Médicale Unité 638, Institut Fédératif de Recherche 50, Nice
| | - S. Bendahhou
- University of Nice Sophia Antipolis, Transport Ionique Aspects Normaux et Pathologiques, Formation de Recherche en Evolution 3093 Centre National de la Recherche Scientifique, Parc Valrose, Nice
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Arzel-Hézode M, McGoey S, Sternberg D, Vicart S, Eymard B, Fontaine B. Glucocorticoids may trigger attacks in several types of periodic paralysis. Neuromuscul Disord 2009; 19:217-9. [PMID: 19201608 DOI: 10.1016/j.nmd.2008.12.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Revised: 12/15/2008] [Accepted: 12/29/2008] [Indexed: 11/19/2022]
Affiliation(s)
- Marianne Arzel-Hézode
- Assistance Publique-Hôpitaux de Paris, Centre de Référence des Canalopathies Musculaires, Centre de Référence des Maladies Neuromusculaires-Paris Est et Service de Génétique, Groupe Hospitalier Pitié-Salpêtrière, 75651 Paris 13, France
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Matthews E, Guet A, Mayer M, Vicart S, Pemble S, Sternberg D, Fontaine B, Hanna MG. Neonatal hypotonia can be a sodium channelopathy: recognition of a new phenotype. Neurology 2008; 71:1740-2. [PMID: 19015492 DOI: 10.1212/01.wnl.0000335269.21550.0e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- E Matthews
- MRC Centre for Neuromuscular Disease, Institute of Neurology, UCL, Queen Square, London, UK
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Matthews E, Guet A, Mayer M, Vicart S, Pemble S, Sternberg D, Fontaine B, Hanna M. D.P.2.13 Neonatal hypotonia can be a sodium channelopathy. Neuromuscul Disord 2008. [DOI: 10.1016/j.nmd.2008.06.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Fontaine B, Fournier E, Sternberg D, Vicart S, Tabti N. Hypokalemic periodic paralysis: a model for a clinical and research approach to a rare disorder. Neurotherapeutics 2007; 4:225-32. [PMID: 17395132 DOI: 10.1016/j.nurt.2007.01.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Rare diseases have attracted little attention in the past from physicians and researchers. The situation has recently changed for several reasons. First, patient associations have successfully advocated their cause to institutions and governments. They were able to argue that, taken together, rare diseases affect approximately 10% of the population in developed countries. Second, almost 80% of rare diseases are of genetic origin. Advances in genetics have enabled the identification of the causative genes. Unprecedented financial support has been dedicated to research on rare diseases, as well as to the development of referral centers aimed at improving the quality of care. This expenditure of resources is justified by the experience in cystic fibrosis, which demonstrated that improved care delivered by specialized referral centers resulted in a dramatic increase of life expectancy. Moreover, clinical referral centers offer the unique possibility of developing high quality clinical research studies, not otherwise possible because of the geographic dispersion of patients. This is the case in France where national referral centers for rare diseases were created, including one for muscle channelopathies. The aim of this center is to develop appropriate care, clinical research, and teaching on periodic paralysis and myotonia. In this review, we plan to demonstrate how research has improved our knowledge of hypokalemic periodic paralysis and the way we evaluate, advise, and treat patients. We also advocate for the establishment of international collaborations, which are mandatory for the follow-up of cohorts and conduct of definitive therapeutic trials in rare diseases.
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Affiliation(s)
- Bertrand Fontaine
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR S546, Paris, France.
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Cohen Aubart F, Sedel F, Vicart S, Lyon-Caen O, Fontaine B. Troubles neurologiques par carence en vitamine B12 déclenchés par le protoxyde d’azote. Rev Neurol (Paris) 2007; 163:362-4. [PMID: 17404524 DOI: 10.1016/s0035-3787(07)90409-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
INTRODUCTION Nitrous oxide is frequently used for anesthesia. It may cause spinal cord toxicity. CASE REPORTS We report two patients who presented gait disorders after nitrous oxide anesthesia. Physical examination revealed arms and legs pyramidal syndrome and abnormal proprioception, consistent with subacute combined degeneration of the spinal cord. Serum vitamin B12 level was extremely low. The patients improved with parenteral treatment with hydroxycobalamin. CONCLUSIONS The inactivation of methionine synthase and L methylmalonylcoA mutase by nitrous oxide has been previously demonstrated. Anesthesia-related exposure to nitrous oxide may induce neurologic disorders even in patients with no preliminary vitamin B12 deficiency.
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Affiliation(s)
- F Cohen Aubart
- Assistance Publique-Hôpitaux de Paris, Fédération des maladies du Système Nerveux, et Université Pierre et Marie Curie, Groupe Hospitalier Pitié Salpêtrière 47-83 boulevard de l'hôpital 75013 Paris, France
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Stum M, Davoine CS, Vicart S, Guillot-Noël L, Topaloglu H, Carod-Artal FJ, Kayserili H, Hentati F, Merlini L, Urtizberea JA, Hammouda EH, Quan PC, Fontaine B, Nicole S. Spectrum of HSPG2 (Perlecan) mutations in patients with Schwartz-Jampel syndrome. Hum Mutat 2006; 27:1082-91. [PMID: 16927315 DOI: 10.1002/humu.20388] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Schwartz-Jampel syndrome (SJS) is a rare autosomal recessive condition defined by the association of myotonia with chondrodysplasia. SJS results from mutations in the HSPG2 gene, which encodes perlecan, a major component of basement membranes. Only eight HSPG2 mutations have been reported in six SJS families. Here, we describe the molecular findings in 23 families (35 patients) with SJS, being one-third of the SJS cases reported in the medical literature. We identified 22 new HSPG2 mutations and unreported polymorphisms. Mutations included nine deletion or insertion (41%), six splice site (27%), five missense (23%), and two nonsense mutations (9%). All but four mutations were private, and we found no evidence for a founder effect. Analyses of HSPG2 messenger RNA (mRNA) and perlecan immunostaining on patients' cells revealed a hypomorphic effect of the studied mutations. They also demonstrated distinct consequences of truncating and missense mutations on perlecan expression as truncating mutations resulted in instability of HSPG2 mRNA through nonsense mRNA-mediated decay, whereas missense mutations involving cysteine residues led to intracellular retention of perlecan, probably due to quality control pathways. Our analyses strengthen the idea that SJS results from hypomorphic mutations of the HSPG2 gene. They also propose tools for its molecular diagnosis and provide new clues for the understanding of its pathophysiology.
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Abstract
Ion channels are transmembrane proteins that allow ions to flow in or out of the cell. Sodium and potassium channel activation and inactivation are the basis of action potential's production and conduction. During the past 15 years, ion channels have been implicated in diseases that have come to be known as the channelopathies. Over 30 mutations of the muscle channel gene SCN4A, which encodes the muscle voltage-gated sodium channel, have been described and associated with neuromuscular disorders like hypo- and hyper-kalaemic periodic paralyses (hypoPP and hyperPP), paramyotonia congenita, sodium channel myotonias and congenital myasthenic syndrome. Different mutations within the same gene (SCN4A) cause distinct clinical disorders, while mutations in different channel genes may result in similar phenotypes. In addition, identical sodium channel mutations can result in different clinical phenotypes (hyperPP or paramyotonia) in different members of the same family, suggesting that the genetic background and perhaps other epigenetic factors may influence the clinical expression of a particular mutation. This article reviews the clinical features of the skeletal muscle sodium channel diseases and highlights the phenotypic or genetic overlap in these disorders.
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Affiliation(s)
- S Vicart
- Fédération de Neurologie and INSERM U546, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique Hôpitaux de Paris, Paris, France
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Fournier E, Arzel M, Sternberg D, Vicart S, Laforet P, Eymard B, Willer JC, Tabti N, Fontaine B. Electromyography guides toward subgroups of mutations in muscle channelopathies. Ann Neurol 2005; 56:650-61. [PMID: 15389891 DOI: 10.1002/ana.20241] [Citation(s) in RCA: 199] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Myotonic syndromes and periodic paralyses are rare disorders of skeletal muscle characterized mainly by muscle stiffness or episodic attacks of weakness. Familial forms are caused by mutations in genes coding for skeletal muscle voltage-gated ion channels. Exercise is known to trigger, aggravate, or relieve the symptoms. Therefore, exercise can be used as a functional test in electromyography to improve the diagnosis of these muscle disorders. Abnormal changes in the compound muscle action potential can be disclosed using different exercise tests. We report the outcome of an inclusive electromyographic survey of a large population of patients with identified ion channel gene defects. Standardized protocols comprising short and long exercise tests were applied on 41 unaffected control subjects and on 51 case patients with chloride, sodium, or calcium channel mutations known to cause myotonia or periodic paralysis. These tests disclosed significant changes of compound muscle action potential, which generally matched the clinical symptoms. Combining the responses to the different tests defined five electromyographic patterns (I-V) that correlated with subgroups of mutations and may be used in clinical practice as guides for molecular diagnosis. We hypothesize that mutations are segregated into the different electromyographic patterns according to the underlying pathophysiological mechanisms.
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Affiliation(s)
- Emmanuel Fournier
- Department of Physiology, Groupe Hospitalier Pitié-Salpêtrière and Université Pierre et Marie Curie, Paris, France.
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Vicart S, Sternberg D, Fournier E, Ochsner F, Laforet P, Kuntzer T, Eymard B, Hainque B, Fontaine B. New mutations of SCN4A cause a potassium-sensitive normokalemic periodic paralysis. Neurology 2004; 63:2120-7. [PMID: 15596759 DOI: 10.1212/01.wnl.0000145768.09934.ec] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Periodic paralysis is classified into hypokalemic (hypoPP) and hyperkalemic (hyperPP) periodic paralysis according to variations of blood potassium levels during attacks. OBJECTIVE To describe new mutations in the muscle sodium channel gene SCN4A that cause periodic paralysis. METHODS A thorough clinical, electrophysiologic, and molecular study was performed of four unrelated families who presented with periodic paralysis. RESULTS The nine affected members had episodes of muscle weakness reminiscent of both hyperPP and hypoPP. A provocative test with potassium chloride was positive in two patients. However, repeated and carefully performed tests of blood potassium levels during attacks resulted in normal potassium levels. Remarkably, two patients experienced hypokalemic episodes of paralysis related to peculiar provocative factors (corticosteroids and thyrotoxicosis). Similarly to hyperPP, electromyography in nine patients revealed increased compound muscle action potentials after short exercise and a delayed decline during rest after long exercise as well as myotonic discharges in one patient. With use of molecular genetic analysis of the gene SCN4A, three new mutations were found affecting codon 675. They resulted in an amino acid substitution of a highly conserved arginine (R) to either a glycine (G), a glutamine (Q), or a tryptophan (W). Interestingly, hypoPP is caused by both mutations affecting nearby codons as well as the change of an arginine into another amino acid. CONCLUSION A potassium-sensitive and normokalemic type of periodic paralysis caused by new SCN4A mutations at codon 675 is reported.
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Affiliation(s)
- S Vicart
- Fédération de Neurologie and INSERM U546, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique Hôpitaux de Paris, and Université Pierre et Marie Curie, Paris, France
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Dervaux A, Vicart S, Lopes F, Le Borgne MH. [Psychiatric manifestations of a new variant of Creutzfeldt-Jakob disease. Apropos of a case]. Encephale 2001; 27:194-7. [PMID: 11407273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
UNLABELLED The new variant of Creutzfeldt-Jakob disease (nvCJD) was first described in the UK in 1996 (16). The nvCJD differs from sporadic, genetic and iatrogenic CJD. Creutzfeldt-Jakob disease is closely associated with an abnormal isoform PrPSc of a cell-surface glycoprotein, prion protein (14). Molecular analysis suggests that nvCJD is caused by the same prion strain as bovine spongiform encephalopathy (BSE) (4, 10). To the end of September 2000, there have been 82 cases of nvCJD in the UK. We report the second French case of nvCJD to our knowledge (5, 13). CASE REPORT This 36 year old woman was referred by a local general practitioner with a 6 month history of psychiatric symptoms of major depressive disorder. According to her family, the patient had suffered from personality change for several months before the onset of depression including apathy, emotional lability, infantile affect. There was no history of health problems. As she was admitted to the psychiatric department of our hospital in Paris suburbs, she presented a major depressive disorder. There were no specific psychiatric features allowing distinction from common depressive disorders, except a marked emotional lability. The patient's condition progressed rapidly within the following days. She presented memory impairment and disorientation. Drug treatments, clomipramine (125 mg/day) and venlafaxine (200 mg/day), were used with no benefit. She presented subsequently transient delusions and auditory hallucinations, fleeting for some hours. The predominant delusional themes were somatic type and pregnancy. The delusions were concomitant with delusions of the onset of cognitive impairment. The patient tested negative for the P 14.3.3 protein in the CSF. Computed tomography scan of the brain did not show any relevant abnormality. The electroencephalogram showed non specific slow wave activity. The neurological symptoms developed 7 months after the onset of depressive symptoms including ataxia, myoclonus, excessive daytime drowsiness, headache. After the onset of neurological symptoms, the illness progressed rapidly over the next 2 months with cognitive impairment, particularly memory impairment, myoclonus, ataxia, incontinence of urine and progressive immobility leading to dependency. CSF tests were negative. She was referred to a neurology department where the diagnosis was confirmed by brain biopsy (detailed elsewhere). The patient died in a state of akinetic mutism. DISCUSSION The clinical features of our patient were consistent with previous descriptions of nvCJD, mainly those of the National CJD Surveillance Unit studies (17): early psychiatric symptoms, prolonged duration of illness (median: 14 months), earlier age at death, compared with sporadic CJD. Psychiatric symptoms occur in the clinical course in about a third of cases of sporadic CJD (3). In contrast, of the 35 cases that have died of nvCJD identified in the study by Will et al. (17), 34 suffered from early and prominent psychiatric symptoms, mainly depression and anxiety. In most of the patients, the first symptoms were psychiatric. Drug treatment was used in most cases, some patients had a transient improvement (18). The patient without psychiatric symptoms reported by the NCJDSU (17) was emotionally labile. Infantile affect and emotional lability, found in our patient, are frequently reported in other studies (1, 18). Schizophreniform disorders have been described during the clinical course, with auditory and visual hallucinations and paranoid delusions (17, 18). The insomnia and excessive daytime drowsiness our patient presented have been described in similar cases (18). Investigations are important to rule out alternative diagnoses. EEG records do not show periodic triphasic complexes as in sporadic CJD. The P 14.3.3 protein in the CSF is positive in half the cases of nvCJD (17). First neurological symptoms developed 6 months after the onset of psychiatric symptoms including ataxia, myoclonus and persistent painful sensory symptoms (17, 18). In most of the cases, MRI brain scans show bilateral pulvinar high signal (17), found subsequently in our patient and detailed elsewhere (13). The terminal stages are progressive cognitive impairment, helplessness and akinetic mutism. CONCLUSION The first symptoms of this patient were purely psychiatric and difficult to distinguish from common psychiatric disorders. Clinical surveillance of human prion disease is crucial in France, as in UK. The link with BSE has dramatically highlighted the need for neurological and neuropsychological precise investigations.
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Affiliation(s)
- A Dervaux
- Service de Psychiatrie, BP 27, Centre Hospitalier Général, F-91401 Orsay
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