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Skriver SV, Krett B, Poulsen NS, Krag T, Walas HR, Christensen AH, Bundgaard H, Vissing J, Vissing CR. Skeletal Muscle Involvement in Patients With Truncations of Titin and Familial Dilated Cardiomyopathy. JACC Heart Fail 2024; 12:740-753. [PMID: 37999665 DOI: 10.1016/j.jchf.2023.10.010] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 09/29/2023] [Accepted: 10/03/2023] [Indexed: 11/25/2023]
Abstract
BACKGROUND Genetic variants in titin (TTN) are associated with dilated cardiomyopathy (DCM) and skeletal myopathy. However, the skeletal muscle phenotype in individuals carrying heterozygous truncating TTN variants (TTNtv), the leading cause of DCM, is understudied. OBJECTIVES This study aimed to assess the skeletal muscle phenotype associated with TTNtv. METHODS Participants with TTNtv were included in a cross-sectional study. Skeletal muscle fat fraction was evaluated by magnetic resonance imaging (compared with healthy controls and controls with non-TTNtv DCM). Muscle strength was evaluated by dynamometry and muscle biopsy specimens were analyzed. RESULTS Twenty-five TTNtv participants (11 women, mean age 51 ± 15 years, left ventricular ejection fraction 45% ± 10%) were included (19 had DCM). Compared to healthy controls (n = 25), fat fraction was higher in calf (12.5% vs 9.9%, P = 0.013), thigh (12.2% vs 9.3%, P = 0.004), and paraspinal muscles (18.8% vs 13.9%, P = 0.008) of TTNtv participants. Linear mixed effects modelling found higher fat fractions in TTNtv participants compared to healthy controls (2.5%; 95% CI: 1.4-3.7; P < 0.001) and controls with non-TTNtv genetic DCM (n = 7) (1.5%; 95% CI: 0.2-2.8; P = 0.025). Muscle strength was within 1 SD of normal values. Biopsy specimens from 21 participants found myopathic features in 13 (62%), including central nuclei. Electron microscopy showed well-ordered Z-lines and T-tubuli but uneven and discontinuous M-lines and excessive glycogen depositions flanked by autophagosomes, lysosomes, and abnormal mitochondria with mitophagy. CONCLUSIONS Mild skeletal muscle involvement was prevalent in patients with TTNtv. The phenotype was characterized by an increased muscle fat fraction and excessive accumulation of glycogen, possibly due to reduced autophagic flux. These findings indicate an impact of TTNtv beyond the heart.
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Affiliation(s)
- Sofie Vinther Skriver
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Bjørg Krett
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Nanna Scharf Poulsen
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Thomas Krag
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Helle Rudkjær Walas
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Alex Hørby Christensen
- Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark; Department of Cardiology, Copenhagen University Hospital, Herlev-Gentofte Hospital, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Henning Bundgaard
- Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - John Vissing
- Copenhagen Neuromuscular Center, Department of Neurology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Løkken N, Nielsen MR, Stemmerik MG, Ellerton C, Revsbech KL, Macrae M, Slipsager A, Krett B, Beha GH, Emanuelsson F, van Hall G, Quinlivan R, Vissing J. Can a modified ketogenic diet be a nutritional strategy for patients with McArdle disease? Results from a randomized, single-blind, placebo-controlled, cross-over study. Clin Nutr 2023; 42:2124-2137. [PMID: 37769369 DOI: 10.1016/j.clnu.2023.09.006] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/13/2023] [Accepted: 09/13/2023] [Indexed: 09/30/2023]
Abstract
BACKGROUND McArdle disease is caused by myophosphorylase deficiency leading to blocked glycogenolysis in skeletal muscle. Consequently, individuals with McArdle disease have intolerance to physical activity, muscle fatigue, and pain. These symptoms vary according to the availability of alternative fuels for muscle contraction. In theory, a modified ketogenic diet (mKD) can provide alternative fuels in the form of ketone bodies and potentially boost fat oxidation. METHODS This randomized, single-blind, placebo-controlled, cross-over study aimed to investigate if a mKD improves exercise capacity in individuals with McArdle disease. Participants were randomized to follow a mKD (75-80% fat, 15% protein, 5-10% carbohydrates) or placebo diet (PD) first for three weeks, followed by a wash-out period, and then the opposite diet. The primary outcome was change in heart rate during constant-load cycling. Secondary outcomes included change in plasma metabolites, perceived exertion, indirect calorimetry measures, maximal exercise capacity, and patient-reported outcomes. RESULTS Fifteen out of 20 patients with genetically verified McArdle disease completed all study visits, and 14 were included in the data analyses. We found that the mKD induced a metabolic shift towards increased fat oxidation (∼60% increase), and a 19-fold increase in plasma β-hydroxybutyrate (p < 0.05). The mKD did not improve heart rate responses during constant-load cycling but did improve patient-reported outcomes and maximal exercise capacity (∼20% increase) compared to the PD. CONCLUSION The mKD did not alleviate all McArdle disease-related symptoms but did induce some positive changes. To date, no satisfactory treatment options exist other than exercise training. To that end, a mKD can be a possible nutritional strategy for some individuals with McArdle disease who are motivated to undertake a restrictive diet. CLINICAL TRIAL REGISTRATION clinical trials.gov: NCT04044508.
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Affiliation(s)
- Nicoline Løkken
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
| | - Maja Risager Nielsen
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark
| | - Mads Godtfeldt Stemmerik
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Charlotte Ellerton
- The Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Karoline Lolk Revsbech
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark
| | - Margaret Macrae
- The Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Anna Slipsager
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Bjørg Krett
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark
| | - Gry Hatting Beha
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark
| | - Frida Emanuelsson
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark
| | - Gerrit van Hall
- Clinical Metabolomics Core Facility, Clinical Biochemistry, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark; Department of Biomedical Sciences, Faculty of Health & Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Rosaline Quinlivan
- The Institute of Neurology, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - John Vissing
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, DK-2100 Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
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Savvatis K, Vissing CR, Klouvi L, Florian A, Rahman M, Béhin A, Fayssoil A, Masingue M, Stojkovic T, Bécane HM, Berber N, Mochel F, Duboc D, Fontaine B, Krett B, Stalens C, Lejeune J, Pitceathly RDS, Lopes L, Saadi M, Gossios T, Procaccio V, Spinazzi M, Tard C, De Groote P, Dhaenens CM, Douillard C, Echaniz-Laguna A, Quinlivan R, Hanna MG, Yilmaz A, Vissing J, Laforêt P, Elliott P, Wahbi K. Cardiac Outcomes in Adults With Mitochondrial Diseases. J Am Coll Cardiol 2022; 80:1421-1430. [PMID: 36202532 DOI: 10.1016/j.jacc.2022.08.716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 03/07/2022] [Revised: 07/22/2022] [Accepted: 08/01/2022] [Indexed: 01/07/2023]
Abstract
BACKGROUND Patients with mitochondrial diseases are at risk of heart failure (HF) and arrhythmic major adverse cardiac events (MACE). OBJECTIVES We developed prediction models to estimate the risk of HF and arrhythmic MACE in this population. METHODS We determined the incidence and searched for predictors of HF and arrhythmic MACE using Cox regression in 600 adult patients from a multicenter registry with genetically confirmed mitochondrial diseases. RESULTS Over a median follow-up time of 6.67 years, 29 patients (4.9%) reached the HF endpoint, including 19 hospitalizations for nonterminal HF, 2 cardiac transplantations, and 8 deaths from HF. Thirty others (5.1%) reached the arrhythmic MACE, including 21 with third-degree or type II second-degree atrioventricular blocks, 4 with sinus node dysfunction, and 5 sudden cardiac deaths. Predictors of HF were the m.3243A>G variant (HR: 4.3; 95% CI: 1.8-10.1), conduction defects (HR: 3.0; 95% CI: 1.3-6.9), left ventricular (LV) hypertrophy (HR: 2.6; 95% CI: 1.1-5.8), LV ejection fraction <50% (HR: 10.2; 95% CI: 4.6-22.3), and premature ventricular beats (HR: 4.1; 95% CI: 1.7-9.9). Independent predictors for arrhythmia were single, large-scale mtDNA deletions (HR: 4.3; 95% CI: 1.7-10.4), conduction defects (HR: 6.8; 95% CI: 3.0-15.4), and LV ejection fraction <50% (HR: 2.7; 95% CI: 1.1-7.1). C-indexes of the Cox regression models were 0.91 (95% CI: 0.88-0.95) and 0.80 (95% CI: 0.70-0.90) for the HF and arrhythmic MACE, respectively. CONCLUSIONS We developed the first prediction models for HF and arrhythmic MACE in patients with mitochondrial diseases using genetic variant type and simple cardiac assessments.
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Affiliation(s)
- Konstantinos Savvatis
- Inherited Cardiac Conditions Unit, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom; William Harvey Research Institute, Queen Mary University London, London, United Kingdom; Centre for Heart Muscle Disease, Institute for Cardiovascular Science, University College London, London, United Kingdom
| | - Christoffer Rasmus Vissing
- Copenhagen Neuromuscular Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark; The Capital Region's Unit for Inherited Cardiac Diseases, Department of Cardiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | | | - Anca Florian
- Department of Cardiology I, Division of Cardiovascular Imaging, University Hospital Münster, Münster, Germany
| | - Mehjabin Rahman
- Centre for Heart Muscle Disease, Institute for Cardiovascular Science, University College London, London, United Kingdom
| | - Anthony Béhin
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France
| | - Abdallah Fayssoil
- AP-HP, Raymond Poincare University Hospital, Garches, France; Université de Versailles-Saint Quentin, Boulogne-Billancourt, France
| | - Marion Masingue
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France
| | - Tanya Stojkovic
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France
| | - Henri Marc Bécane
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France
| | - Nawal Berber
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France
| | - Fanny Mochel
- AP-HP, Pitié-Salpêtrière Hospital, Genetics Department, Inserm UMR S975, CNRS UMR7225, ICM, Paris, France; Pierre et Marie Curie-Paris 6 University, Myology Institute, Pitié-Salpêtrière Hospital, Paris, France
| | - Denis Duboc
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France; AP-HP, Cochin Hospital, Cardiology Department, Paris Cedex, France; Université de Paris, Paris, France
| | - Bertrand Fontaine
- Sorbonne-Université, INSERM, Assistance Publique-Hôpitaux de Paris (AP-HP), Centre de Recherche en Myologie-UMR 974, Service de Neuro-Myologie, Institut de Myologie, Hôpital Universitaire Pitié-Salpêtrière, Paris, France
| | - Bjørg Krett
- Copenhagen Neuromuscular Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | | | | | - Robert D S Pitceathly
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Luis Lopes
- Inherited Cardiac Conditions Unit, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom; Centre for Heart Muscle Disease, Institute for Cardiovascular Science, University College London, London, United Kingdom
| | - Malika Saadi
- AP-HP, Cochin Hospital, Cardiology Department, Paris Cedex, France
| | - Thomas Gossios
- Cardiomyopathies Laboratory, 1st Aristotle University of Thessaloniki Cardiology Department, AHEPA University Hospital, Thessaloniki, Greece
| | - Vincent Procaccio
- Equipe Mitolab, Unité Mixte de Recherche MITOVASC, CNRS 6015, INSERM U1083, Université d'Angers, Angers, France; Département de Biochimie et Génétique, Centre Hospitalier Universitaire, Angers, France
| | - Marco Spinazzi
- Département de Biochimie et Génétique, Centre Hospitalier Universitaire, Angers, France; Neuromuscular Reference Center, Department of Neurology, CHU Angers, Angers, France
| | - Céline Tard
- Université de Lille, INSERMU1172, Lille, France; Centre de Référence des Maladies Neuromusculaires Nord Est Ile de France, CHU de Lille, Lille, France
| | - Pascal De Groote
- Service de Cardiologie, Pôle Cardio-vasculaire et Pulmonaire, CHRU de Lille, Lille, France; Inserm U1167, Institut Pasteur de Lille, Université de Lille 2, Lille, France
| | - Claire-Marie Dhaenens
- Université de Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, Lille, France
| | - Claire Douillard
- CHU de Lille, Département d'Endocrinologie et Métabolisme, Centre de Référence des Maladies Héréditaires du Métabolisme, Hôpital Huriez, Lille, France
| | - Andoni Echaniz-Laguna
- Department of Neurology, APHP, CHU de Bicêtre, Le Kremlin-Bicêtre, France; French National Reference Center for Rare Neuropathies (NNERF), Le Kremlin-Bicêtre, France; INSERM U1195, Paris-Saclay University, Le Kremlin-Bicêtre, France
| | - Ros Quinlivan
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Michael G Hanna
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Ali Yilmaz
- Department of Cardiology I, Division of Cardiovascular Imaging, University Hospital Münster, Münster, Germany
| | - John Vissing
- Copenhagen Neuromuscular Centre, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Pascal Laforêt
- Inserm U1167, Institut Pasteur de Lille, Université de Lille 2, Lille, France; Nord/Est/Île-de-France Neuromuscular Reference Center, Neurology Department, 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
| | - Perry Elliott
- Inherited Cardiac Conditions Unit, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom; Centre for Heart Muscle Disease, Institute for Cardiovascular Science, University College London, London, United Kingdom
| | - Karim Wahbi
- AP-HP, Pitié-Salpêtrière Hospital, Reference Center for Muscle Diseases Paris-Est, Myology Institute, Paris, France; AP-HP, Cochin Hospital, Cardiology Department, Paris Cedex, France; Université de Paris, Paris, France; Paris Cardiovascular Research Center (PARCC), INSERM Unit 970, Paris, France.
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Bayat A, Krett B, Dunø M, Torring PM, Vissing J. Novel truncating variants in FGD1 detected in two Danish families with Aarskog-Scott syndrome and myopathic features. Am J Med Genet A 2022; 188:2251-2257. [PMID: 35388608 PMCID: PMC9321604 DOI: 10.1002/ajmg.a.62753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 11/10/2021] [Revised: 03/13/2022] [Accepted: 03/19/2022] [Indexed: 11/09/2022]
Abstract
Aarskog–Scott syndrome (AAS) is a developmental disorder, caused by disease‐causing hemizygous variants in the FGD1 gene. AAS is characterized by dysmorphic features, genital malformation, skeletal anomalies, and in some cases, intellectual disability and behavioral difficulties. Myopathy has only been reported once in two affected siblings diagnosed with AAS. Only few adult cases have been reported. This article reports four adults with AAS (three male cases and one female carrier) from two unrelated Danish families, all males presented with variable features suggestive of myopathy. All four carried novel hemizygous pathogenic variants in the FGD1 gene; one family presented with the c.2266dup, p.Cys756Leufs*19 variant while the c.527dup; p.Leu177Thrfs*40 variant was detected in the second family. All males had some mild myopathic symptoms or histological abnormalities. Case 1 had the most severe myopathic phenotype with prominent proximal muscular fatigue and exercise intolerance. In addition, he had multiple deletions of mtDNA and low respiratory chain activity. His younger nephew, case 3, had difficulties doing sports in his youth and had a mildly abnormal muscle biopsy and relatively decreased mitochondrial enzyme activity. The singular case from family 2 (case 4), had a mildly myopathic muscle biopsy, but no overt myopathic symptoms. Our findings suggest that myopathic involvement should be considered in AAS.
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Affiliation(s)
- Allan Bayat
- Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Centre, Dianalund, Denmark.,Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Bjørg Krett
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Morten Dunø
- Department of Clinical Genetics, Molecular Genetic Laboratory, University Hospital Copenhagen, Copenhagen, Denmark
| | | | - John Vissing
- Copenhagen Neuromuscular Center, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
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