1. Pathogenic variants in the myosin chaperone UNC-45B cause progressive myopathy with eccentric cores
- Author
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Serena Governali, Jonathan Baets, Sarah Djeddi, Willem De Ridder, Reza Maroofian, Ying Hu, Stephanie Efthymiou, Xavière Lornage, Stefan Conijn, Vincenzo Salpietro, Aritoshi Iida, Satoru Noguchi, Norma B. Romero, Magdalena Mroczek, Carola Hedberg-Oldfors, Tumtip Sangruchi, Julien Fauré, S. Neuhaus, Wojciech Pokrzywa, Ichizo Nishino, Ana Töpf, Kanokwan Boonyapisit, Fabiana Lubieniecki, Edoardo Malfatti, Jantima Tanboon, Chiara Fiorillo, Johann Böhm, Thorsten Hoppe, Véronique Bolduc, Soledad Monges, Niklas Darin, Coen A.C. Ottenheijm, Riley M. McCarty, Volker Straub, Anders Oldfors, Gabriella Di Rosa, A. Reghan Foley, Henry Houlden, John Rendu, Nancy L. Kuntz, Jocelyn Laporte, Carsten G. Bönnemann, Carl Elias Kutzner, Tanya Stojkovic, Katherine R. Chao, Iren Horkayne-Szakaly, Sandra Donkervoort, National Institute of Neurological Disorders and Stroke [Bethesda] (NINDS), National Institutes of Health [Bethesda] (NIH), University of Cologne, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre Hospitalier Universitaire [Grenoble] (CHU), [GIN] Grenoble Institut des Neurosciences (GIN), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Grenoble Alpes (UGA), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), University of Antwerp (UA), Mahidol University [Bangkok], University College of London [London] (UCL), Newcastle University [Newcastle], Amsterdam UMC - Amsterdam University Medical Center, Northwestern University Feinberg School of Medicine, Hospital Nacional de Pediatría J.P. Garrahan, Broad Institute of MIT and Harvard (BROAD INSTITUTE), Harvard Medical School [Boston] (HMS)-Massachusetts Institute of Technology (MIT)-Massachusetts General Hospital [Boston], Hôpital Raymond Poincaré [AP-HP], National Center of Neurology and Psychiatry, University of Gothenburg (GU), National Center of Neurology and Psychiatry [Tokyo, Japan], University of Messina, Università degli studi di Genova = University of Genoa (UniGe), International Institute of Molecular and Cell Biology [Warsaw] (IIMCB), Centre de recherche en Myologie – U974 SU-INSERM, Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), University of Arizona, univOAK, Archive ouverte, Physiology, and ACS - Pulmonary hypertension & thrombosis
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0301 basic medicine ,Male ,muscle ,myosin ,Sarcomere ,Whole Exome Sequencing ,0302 clinical medicine ,Myofibrils ,Loss of Function Mutation ,Myosin ,Missense mutation ,chaperone ,Transgenes ,Genetics (clinical) ,Caenorhabditis elegans ,C. elegans ,core myopathy ,myofibrillar ,sarcomere ,UNC-45 ,UNC45B ,Adolescent ,Adult ,Alleles ,Animals ,Caenorhabditis elegans Proteins ,Female ,Genetic Variation ,Humans ,Molecular Chaperones ,Muscle, Skeletal ,Muscular Diseases ,Myosins ,Sarcomeres ,Sequence Analysis, RNA ,Young Adult ,Mutation, Missense ,biology ,Skeletal ,Cell biology ,Myosin binding ,[SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] ,medicine.symptom ,Sequence Analysis ,macromolecular substances ,Article ,03 medical and health sciences ,Exome Sequencing ,Genetics ,medicine ,[SDV.NEU] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] ,Myopathy ,fungi ,biology.organism_classification ,030104 developmental biology ,Chaperone (protein) ,Mutation ,biology.protein ,RNA ,Human medicine ,Missense ,Myofibril ,030217 neurology & neurosurgery - Abstract
The myosin-directed chaperone UNC-45B is essential for sarcomeric organization and muscle function from Caenorhabditis elegans to humans. The pathological impact of UNC-45B in muscle disease remained elusive. We report ten individuals with bi-allelic variants in UNC45B who exhibit childhood-onset progressive muscle weakness. We identified a common UNC45B variant that acts as a complex hypomorph splice variant. Purified UNC-45B mutants showed changes in folding and solubility. In situ localization studies further demonstrated reduced expression of mutant UNC-45B in muscle combined with abnormal localization away from the A-band towards the Z-disk of the sarcomere. The physiological relevance of these observations was investigated in C. elegans by transgenic expression of conserved UNC-45 missense variants, which showed impaired myosin binding for one and defective muscle function for three. Together, our results demonstrate that UNC-45B impairment manifests as a chaperonopathy with progressive muscle pathology, which discovers the previously unknown conserved role of UNC-45B in myofibrillar organization.
- Published
- 2020
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