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Adupa V, Ustyantseva E, Kampinga HH, Onck PR. Tertiary structure and conformational dynamics of the anti-amyloidogenic chaperone DNAJB6b at atomistic resolution. Nat Commun 2024; 15:3285. [PMID: 38627370 PMCID: PMC11021509 DOI: 10.1038/s41467-024-46587-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 03/01/2024] [Indexed: 04/19/2024] Open
Abstract
DNAJB6b is a molecular chaperone of the heat shock protein network, shown to play a crucial role in preventing aggregation of several disease-related intrinsically disordered proteins. Using homology modeling and microsecond-long all-atom molecular dynamics (MD) simulations, we show that monomeric DNAJB6b is a transiently interconverting protein cycling between three states: a closed state, an open state (both abundant), and a less abundant extended state. Interestingly, the reported regulatory autoinhibitory anchor between helix V in the G/F1 region and helices II/III of the J-domain, which obstructs the access of Hsp70 to the J-domain remains present in all three states. This possibly suggests a mechanistically intriguing regulation in which DNAJB6b only becomes exposed when loaded with substrates that require Hsp70 processing. Our MD results of DNAJB6b carrying mutations in the G/F1 region that are linked to limb-girdle muscular dystrophy type D1 (LGMDD1) show that this G/F1 region becomes highly dynamic, pointing towards a spontaneous release of the autoinhibitory helix V from helices II/III. This would increase the probability of non-functional Hsp70 interactions to DNAJB6b without substrates. Our cellular data indeed confirm that non-substrate loaded LGMDD1 mutants have aberrant interactions with Hsp70.
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Affiliation(s)
- Vasista Adupa
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Elizaveta Ustyantseva
- Department of Biomedical Sciences, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Harm H Kampinga
- Department of Biomedical Sciences, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Patrick R Onck
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
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2
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McKaige EA, Lee C, Calcinotto V, Giri S, Crawford S, McGrath MJ, Ramm G, Bryson-Richardson RJ. Mitochondrial abnormalities contribute to muscle weakness in a Dnajb6 deficient zebrafish model. Hum Mol Genet 2024:ddae061. [PMID: 38621658 DOI: 10.1093/hmg/ddae061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 02/28/2024] [Accepted: 03/28/2024] [Indexed: 04/17/2024] Open
Abstract
Mutations in DNAJB6 are a well-established cause of limb girdle muscular dystrophy type D1 (LGMD D1). Patients with LGMD D1 develop progressive muscle weakness with histology showing fibre damage, autophagic vacuoles, and aggregates. Whilst there are many reports of LGMD D1 patients, the role of DNAJB6 in the muscle is still unclear. In this study, we developed a loss of function zebrafish model in order to investigate the role of Dnajb6. Using a double dnajb6a and dnajb6b mutant model, we show that loss of Dnajb6 leads to a late onset muscle weakness. Interestingly, we find that adult fish lacking Dnajb6 do not have autophagy or myofibril defects, however, they do show mitochondrial changes and damage. This study demonstrates that loss of Dnajb6 causes mitochondrial defects and suggests that this contributes to muscle weakness in LGMD D1. These findings expand our knowledge of the role of Dnajb6 in the muscle and provides a model to screen novel therapies for LGMD D1.
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Affiliation(s)
- Emily A McKaige
- School of Biological Sciences Monash University, 25 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Clara Lee
- School of Biological Sciences Monash University, 25 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Vanessa Calcinotto
- School of Biological Sciences Monash University, 25 Rainforest Walk, Clayton, VIC 3800, Australia
| | - Saveen Giri
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, 23 Innovation Walk, Clayton, VIC 3800, Australia
| | - Simon Crawford
- Monash Ramaciotti Centre for Cryo Electron Microscopy, Monash University, 15 Innovation Walk, Clayton, VIC 3800, Australia
| | - Meagan J McGrath
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, 23 Innovation Walk, Clayton, VIC 3800, Australia
| | - Georg Ramm
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, 23 Innovation Walk, Clayton, VIC 3800, Australia
- Monash Ramaciotti Centre for Cryo Electron Microscopy, Monash University, 15 Innovation Walk, Clayton, VIC 3800, Australia
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3
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Abayev-Avraham M, Salzberg Y, Gliksberg D, Oren-Suissa M, Rosenzweig R. DNAJB6 mutants display toxic gain of function through unregulated interaction with Hsp70 chaperones. Nat Commun 2023; 14:7066. [PMID: 37923706 PMCID: PMC10624832 DOI: 10.1038/s41467-023-42735-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 10/19/2023] [Indexed: 11/06/2023] Open
Abstract
Molecular chaperones are essential cellular components that aid in protein folding and preventing the abnormal aggregation of disease-associated proteins. Mutations in one such chaperone, DNAJB6, were identified in patients with LGMDD1, a dominant autosomal disorder characterized by myofibrillar degeneration and accumulations of aggregated protein within myocytes. The molecular mechanisms through which such mutations cause this dysfunction, however, are not well understood. Here we employ a combination of solution NMR and biochemical assays to investigate the structural and functional changes in LGMDD1 mutants of DNAJB6. Surprisingly, we find that DNAJB6 disease mutants show no reduction in their aggregation-prevention activity in vitro, and instead differ structurally from the WT protein, affecting their interaction with Hsp70 chaperones. While WT DNAJB6 contains a helical element regulating its ability to bind and activate Hsp70, in LGMDD1 disease mutants this regulation is disrupted. These variants can thus recruit and hyperactivate Hsp70 chaperones in an unregulated manner, depleting Hsp70 levels in myocytes, and resulting in the disruption of proteostasis. Interfering with DNAJB6-Hsp70 binding, however, reverses the disease phenotype, suggesting future therapeutic avenues for LGMDD1.
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Affiliation(s)
- Meital Abayev-Avraham
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, 761000, Israel
| | - Yehuda Salzberg
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, 761000, Israel
| | - Dar Gliksberg
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, 761000, Israel
| | - Meital Oren-Suissa
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, 761000, Israel
| | - Rina Rosenzweig
- Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot, 761000, Israel.
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4
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Perez VA, Sanders DW, Mendoza-Oliva A, Stopschinski BE, Mullapudi V, White CL, Joachimiak LA, Diamond MI. DnaJC7 specifically regulates tau seeding. eLife 2023; 12:e86936. [PMID: 37387473 PMCID: PMC10473839 DOI: 10.7554/elife.86936] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 06/29/2023] [Indexed: 07/01/2023] Open
Abstract
Neurodegenerative tauopathies are caused by accumulation of toxic tau protein assemblies. This appears to involve template-based seeding events, whereby tau monomer changes conformation and is recruited to a growing aggregate. Several large families of chaperone proteins, including Hsp70s and J domain proteins (JDPs), cooperate to regulate the folding of intracellular proteins such as tau, but the factors that coordinate this activity are not well known. The JDP DnaJC7 binds tau and reduces its intracellular aggregation. However, it is unknown whether this is specific to DnaJC7 or if other JDPs might be similarly involved. We used proteomics within a cell model to determine that DnaJC7 co-purified with insoluble tau and colocalized with intracellular aggregates. We individually knocked out every possible JDP and tested the effect on intracellular aggregation and seeding. DnaJC7 knockout decreased aggregate clearance and increased intracellular tau seeding. This depended on the ability of the J domain (JD) of DnaJC7 to stimulate Hsp70 ATPase activity, as JD mutations that block this interaction abrogated the protective activity. Disease-associated mutations in the JD and substrate binding site of DnaJC7 also abolished its protective activity. DnaJC7 thus specifically regulates tau aggregation in cooperation with Hsp70.
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Affiliation(s)
- Valerie Ann Perez
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - David W Sanders
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Ayde Mendoza-Oliva
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Barbara Elena Stopschinski
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Vishruth Mullapudi
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Charles L White
- Department of Pathology, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Lukasz A Joachimiak
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
- Department of Biochemistry, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
| | - Marc I Diamond
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical CenterDallasUnited States
- Department of Neurology, Peter O’Donnell Jr. Brain Institute, The University of Texas Southwestern Medical CenterDallasUnited States
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5
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Perez VA, Sanders DW, Mendoza-Oliva A, Stopschinski BE, Mullapudi V, White CL, Joachimiak LA, Diamond MI. DnaJC7 specifically regulates tau seeding. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.16.532880. [PMID: 36993367 PMCID: PMC10055123 DOI: 10.1101/2023.03.16.532880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Neurodegenerative tauopathies are caused by accumulation of toxic tau protein assemblies. This appears to involve template-based seeding events, whereby tau monomer changes conformation and is recruited to a growing aggregate. Several large families of chaperone proteins, including Hsp70s and J domain proteins (JDPs) cooperate to regulate the folding of intracellular proteins such as tau, but the factors that coordinate this activity are not well known. The JDP DnaJC7 binds tau and reduces its intracellular aggregation. However, it is unknown whether this is specific to DnaJC7 or if other JDPs might be similarly involved. We used proteomics within a cell model to determine that DnaJC7 co-purified with insoluble tau and colocalized with intracellular aggregates. We individually knocked out every possible JDP and tested the effect on intracellular aggregation and seeding. DnaJC7 knockout decreased aggregate clearance and increased intracellular tau seeding. This depended on the ability of the J domain (JD) of DnaJC7 to bind to Hsp70, as JD mutations that block binding to Hsp70 abrogated the protective activity. Disease-associated mutations in the JD and substrate binding site of DnaJC7 also abrogated its protective activity. DnaJC7 thus specifically regulates tau aggregation in cooperation with Hsp70.
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Affiliation(s)
- Valerie A Perez
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - David W Sanders
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Ayde Mendoza-Oliva
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Barbara E Stopschinski
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Vishruth Mullapudi
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Charles L White
- Department of Pathology, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Lukasz A Joachimiak
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
- Department of Biochemistry, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
| | - Marc I Diamond
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
- Department of Neurology, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX
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6
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Tedesco B, Vendredy L, Timmerman V, Poletti A. The chaperone-assisted selective autophagy complex dynamics and dysfunctions. Autophagy 2023:1-23. [PMID: 36594740 DOI: 10.1080/15548627.2022.2160564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Each protein must be synthesized with the correct amino acid sequence, folded into its native structure, and transported to a relevant subcellular location and protein complex. If any of these steps fail, the cell has the capacity to break down aberrant proteins to maintain protein homeostasis (also called proteostasis). All cells possess a set of well-characterized protein quality control systems to minimize protein misfolding and the damage it might cause. Autophagy, a conserved pathway for the degradation of long-lived proteins, aggregates, and damaged organelles, was initially characterized as a bulk degradation pathway. However, it is now clear that autophagy also contributes to intracellular homeostasis by selectively degrading cargo material. One of the pathways involved in the selective removal of damaged and misfolded proteins is chaperone-assisted selective autophagy (CASA). The CASA complex is composed of three main proteins (HSPA, HSPB8 and BAG3), essential to maintain protein homeostasis in muscle and neuronal cells. A failure in the CASA complex, caused by mutations in the respective coding genes, can lead to (cardio)myopathies and neurodegenerative diseases. Here, we summarize our current understanding of the CASA complex and its dynamics. We also briefly discuss how CASA complex proteins are involved in disease and may represent an interesting therapeutic target.Abbreviation ALP: autophagy lysosomal pathway; ALS: amyotrophic lateral sclerosis; AMOTL1: angiomotin like 1; ARP2/3: actin related protein 2/3; BAG: BAG cochaperone; BAG3: BAG cochaperone 3; CASA: chaperone-assisted selective autophagy; CMA: chaperone-mediated autophagy; DNAJ/HSP40: DnaJ heat shock protein family (Hsp40); DRiPs: defective ribosomal products; EIF2A/eIF2α: eukaryotic translation initiation factor 2A; EIF2AK1/HRI: eukaryotic translation initiation factor 2 alpha kinase 1; GABARAP: GABA type A receptor-associated protein; HDAC6: histone deacetylase 6; HSP: heat shock protein; HSPA/HSP70: heat shock protein family A (Hsp70); HSP90: heat shock protein 90; HSPB8: heat shock protein family B (small) member 8; IPV: isoleucine-proline-valine; ISR: integrated stress response; KEAP1: kelch like ECH associated protein 1; LAMP2A: lysosomal associated membrane protein 2A; LATS1: large tumor suppressor kinase 1; LIR: LC3-interacting region; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MTOC: microtubule organizing center; MTOR: mechanistic target of rapamycin kinase; NFKB/NF-κB: nuclear factor kappa B; NFE2L2: NFE2 like bZIP transcription factor 2; PLCG/PLCγ: phospholipase C gamma; polyQ: polyglutamine; PQC: protein quality control; PxxP: proline-rich; RAN translation: repeat-associated non-AUG translation; SG: stress granule; SOD1: superoxide dismutase 1; SQSTM1/p62: sequestosome 1; STUB1/CHIP: STIP1 homology and U-box containing protein 1; STK: serine/threonine kinase; SYNPO: synaptopodin; TBP: TATA-box binding protein; TARDBP/TDP-43: TAR DNA binding protein; TFEB: transcription factor EB; TPR: tetratricopeptide repeats; TSC1: TSC complex subunit 1; UBA: ubiquitin associated; UPS: ubiquitin-proteasome system; WW: tryptophan-tryptophan; WWTR1: WW domain containing transcription regulator 1; YAP1: Yes1 associated transcriptional regulator.
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Affiliation(s)
- Barbara Tedesco
- Laboratory of Experimental Biology, Dipartimento di Scienze Farmacologiche e Biomolecolari, Dipartimento di Eccellenza 2018-2027, Università degli studi di Milano, Milan, Italy.,Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Leen Vendredy
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences, Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Vincent Timmerman
- Peripheral Neuropathy Research Group, Department of Biomedical Sciences, Institute Born Bunge, University of Antwerp, Antwerpen, Belgium
| | - Angelo Poletti
- Laboratory of Experimental Biology, Dipartimento di Scienze Farmacologiche e Biomolecolari, Dipartimento di Eccellenza 2018-2027, Università degli studi di Milano, Milan, Italy
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7
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Savarese M, Jokela M, Udd B. Distal myopathy. HANDBOOK OF CLINICAL NEUROLOGY 2023; 195:497-519. [PMID: 37562883 DOI: 10.1016/b978-0-323-98818-6.00002-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
Distal myopathies are a group of genetic, primary muscle diseases. Patients develop progressive weakness and atrophy of the muscles of forearm, hands, lower leg, or feet. Currently, over 20 different forms, presenting a variable age of onset, clinical presentation, disease progression, muscle involvement, and histological findings, are known. Some of them are dominant and some recessive. Different variants in the same gene are often associated with either dominant or recessive forms, although there is a lack of a comprehensive understanding of the genotype-phenotype correlations. This chapter provides a description of the clinicopathologic and genetic aspects of distal myopathies emphasizing known etiologic and pathophysiologic mechanisms.
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Affiliation(s)
- Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Manu Jokela
- Neuromuscular Research Center, Department of Neurology, Tampere University and University Hospital, Tampere, Finland; Division of Clinical Neurosciences, Department of Neurology, Turku University Hospital, Turku, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Helsinki, Finland; Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland; Neuromuscular Research Center, Department of Neurology, Tampere University and University Hospital, Tampere, Finland; Department of Neurology, Vaasa Central Hospital, Vaasa, Finland.
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8
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Wei XJ, Sun H, Miao J, Qiu RQ, Jiang ZZ, Ma ZW, Sun W, Yu XF. Clinical-pathological features and muscle imaging findings in 36 Chinese patients with rimmed vacuolar myopathies: case series study and review of literature. Front Neurol 2023; 14:1152738. [PMID: 37188302 PMCID: PMC10175607 DOI: 10.3389/fneur.2023.1152738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 04/03/2023] [Indexed: 05/17/2023] Open
Abstract
Introduction Rimmed vacuolar myopathies (RVMs) are a group of genetically heterogeneous diseases that share histopathological characteristics on muscle biopsy, including the aberrant accumulation of autophagic vacuoles. However, the presence of non-coding sequences and structural mutations, some of which remain undetectable, confound the identification of pathogenic mutations responsible for RVMs. Therefore, we assessed the clinical profiles and muscle magnetic resonance imaging (MRI) changes in 36 Chinese patients with RVMs, emphasizing the role of muscle MRI in disease identification and differential diagnosis to propose a comprehensive literature-based imaging pattern to facilitate improved diagnostic workup. Methods All patients presented with rimmed vacuoles with varying degrees of muscular dystrophic changes and underwent a comprehensive evaluation using clinical, morphological, muscle MRI and molecular genetic analysis. We assessed muscle changes in the Chinese RVMs and provided an overview of the RVMs, focusing on the patterns of muscle involvement on MRI. Results A total of 36 patients, including 24 with confirmed distal myopathy and 12 with limb-girdle phenotype, had autophagic vacuoles with RVMs. Hierarchical clustering of patients according to the predominant effect of the distal or proximal lower limbs revealed that most patients with RVMs could be distinguished. GNE myopathy was the most prevalent form of RVMs observed in this study. Moreover, MRI helped identify the causative genes in some diseases (e.g., desminopathy and hereditary myopathy with early respiratory failure) and confirmed the pathogenicity of a novel mutation (e.g., adult-onset proximal rimmed vacuolar titinopathy) detected using next-generation sequencing. Discussion Collectively, our findings expand our knowledge of the genetic spectrum of RVMs in China and suggest that muscle imaging should be an integral part of assisting genetic testing and avoiding misdiagnosis in the diagnostic workup of RVM.
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9
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Braun JE. Extracellular chaperone networks and the export of J-domain proteins. J Biol Chem 2022; 299:102840. [PMID: 36581212 PMCID: PMC9867986 DOI: 10.1016/j.jbc.2022.102840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/18/2022] [Accepted: 12/20/2022] [Indexed: 12/27/2022] Open
Abstract
An extracellular network of molecular chaperones protects a diverse array of proteins that reside in or pass through extracellular spaces. Proteins in the extracellular milieu face numerous challenges that can lead to protein misfolding and aggregation. As a checkpoint for proteins that move between cells, extracellular chaperone networks are of growing clinical relevance. J-domain proteins (JDPs) are ubiquitous molecular chaperones that are known for their essential roles in a wide array of fundamental cellular processes through their regulation of heat shock protein 70s. As the largest molecular chaperone family, JDPs have long been recognized for their diverse functions within cells. Some JDPs are elegantly selective for their "client proteins," some do not discriminate among substrates and others act cooperatively on the same target. The realization that JDPs are exported through both classical and unconventional secretory pathways has fueled investigation into the roles that JDPs play in protein quality control and intercellular communication. The proposed functions of exported JDPs are diverse. Studies suggest that export of DnaJB11 enhances extracellular proteostasis, that intercellular movement of DnaJB1 or DnaJB6 enhances the proteostasis capacity in recipient cells, whereas the import of DnaJB8 increases resistance to chemotherapy in recipient cancer cells. In addition, the export of DnaJC5 and concurrent DnaJC5-dependent ejection of dysfunctional and aggregation-prone proteins are implicated in the prevention of neurodegeneration. This review provides a brief overview of the current understanding of the extracellular chaperone networks and outlines the first wave of studies describing the cellular export of JDPs.
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10
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The chaperone DNAJB6 surveils FG-nucleoporins and is required for interphase nuclear pore complex biogenesis. Nat Cell Biol 2022; 24:1584-1594. [PMID: 36302971 DOI: 10.1038/s41556-022-01010-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 09/12/2022] [Indexed: 01/18/2023]
Abstract
Biogenesis of nuclear pore complexes (NPCs) includes the formation of the permeability barrier composed of phenylalanine-glycine-rich nucleoporins (FG-Nups) that regulate the selective passage of biomolecules across the nuclear envelope. The FG-Nups are intrinsically disordered and prone to liquid-liquid phase separation and aggregation when isolated. How FG-Nups are protected from making inappropriate interactions during NPC biogenesis is not fully understood. Here we find that DNAJB6, a molecular chaperone of the heat shock protein network, forms foci in close proximity to NPCs. The number of these foci decreases upon removal of proteins involved in the early steps of interphase NPC biogenesis. Conversely, when this process is stalled in the last steps, the number of DNAJB6-containing foci increases and these foci are identified as herniations at the nuclear envelope. Immunoelectron tomography shows that DNAJB6 localizes inside the lumen of the herniations arising at NPC biogenesis intermediates. Loss of DNAJB6 results in the accumulation of cytosolic annulate lamellae, which are structures containing partly assembled NPCs, a feature associated with disturbances in NPC biogenesis. We find that DNAJB6 binds to FG-Nups and can prevent the aggregation of the FG region of several FG-Nups in cells and in vitro. Together, our data show that the molecular chaperone DNAJB6 provides quality control during NPC biogenesis and is involved in the surveillance of native intrinsically disordered FG-Nups.
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11
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Bhadra AK, Rau MJ, Daw JA, Fitzpatrick JAJ, Weihl CC, True HL. Disease-associated mutations within the yeast DNAJB6 homolog Sis1 slow conformer-specific substrate processing and can be corrected by the modulation of nucleotide exchange factors. Nat Commun 2022; 13:4570. [PMID: 35931773 PMCID: PMC9355953 DOI: 10.1038/s41467-022-32318-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 07/26/2022] [Indexed: 11/09/2022] Open
Abstract
Molecular chaperones, or heat shock proteins (HSPs), protect against the toxic misfolding and aggregation of proteins. As such, mutations or deficiencies within the chaperone network can lead to disease. Dominant mutations within DNAJB6 (Hsp40)—an Hsp70 co-chaperone—lead to a protein aggregation-linked myopathy termed Limb-Girdle Muscular Dystrophy Type D1 (LGMDD1). Here, we used the yeast prion model client in conjunction with in vitro chaperone activity assays to gain mechanistic insights into the molecular basis of LGMDD1. Here, we show how mutations analogous to those found in LGMDD1 affect Sis1 (a functional homolog of human DNAJB6) function by altering the structure of client protein aggregates, interfering with the Hsp70 ATPase cycle, dimerization and substrate processing; poisoning the function of wild-type protein. These results uncover the mechanisms through which LGMDD1-associated mutations alter chaperone activity, and provide insights relevant to potential therapeutic interventions. Here the authors describe mechanisms through which analogous LGMDD1 (Limb-Girdle Muscular Dystrophy Type D1) mutations affect Sis1 (a yeast functional homolog of human DNAJB6) chaperone activity and poison the function of wild-type protein; potentially uncovering a new therapeutic route to explore.
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Affiliation(s)
- Ankan K Bhadra
- Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8228, St. Louis, MO, 63110, USA
| | - Michael J Rau
- Washington University Center for Cellular Imaging (WUCCI), Washington University School of Medicine, St. Louis, MO, USA
| | - Jil A Daw
- Department of Neurology, Hope Center for Neurological Diseases, Washington University School of Medicine, St. Louis, MO, USA
| | - James A J Fitzpatrick
- Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8228, St. Louis, MO, 63110, USA.,Washington University Center for Cellular Imaging (WUCCI), Washington University School of Medicine, St. Louis, MO, USA.,Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
| | - Conrad C Weihl
- Department of Neurology, Hope Center for Neurological Diseases, Washington University School of Medicine, St. Louis, MO, USA
| | - Heather L True
- Department of Cell Biology and Physiology, Washington University School of Medicine, 660 South Euclid Avenue, Campus Box 8228, St. Louis, MO, 63110, USA.
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12
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Ji G, Wang N, Han X, Wang Y, Zhang J, Wu Y, Wu H, Ma S, Song X. Case Report: A Novel Splice-Site Mutation in DNAJB6 Associated With Juvenile-Onset Proximal–Distal Myopathy in a Chinese Patient. Front Genet 2022; 13:925926. [PMID: 35812750 PMCID: PMC9259785 DOI: 10.3389/fgene.2022.925926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 05/13/2022] [Indexed: 11/29/2022] Open
Abstract
DNAJB6 was identified as the causative gene of limb-girdle muscular dystrophy type 1D. In recent years, the phenotypic and molecular spectrum of DNAJB6-myopathy has been expanded, and several mutations of DNAJB6 have been identified in Europe, North America, and Asia. Interestingly, almost all identified mutations in previous reports were point mutations, and most of them were clustered in exon 5, which encodes the G/F domain of DNAJB6. The so-far unique splice site mutation eliminating the entire G/F domain was reported to cause a severe, early-onset phenotype. Here, we report a juvenile-onset Chinese patient who presented with proximal–distal myopathy as well as esotropia and facial weakness. Muscle pathology showed rimmed vacuolation and myofibrillar disarrangement. A novel splice-site mutation NM_058246:c.236-1_240delGGTGGA of the DNAJB6 gene was identified by targeted exome sequencing, which results in a severe defect of the G/F domain. This rare mutation type expands the molecular spectrum of DNAJB6-myopathy and further underlines the importance of the G/F region.
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Affiliation(s)
- Guang Ji
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Ning Wang
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Xu Han
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Yaye Wang
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Jinru Zhang
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Yue Wu
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Hongran Wu
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Shaojuan Ma
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
| | - Xueqin Song
- Department of Neurology, Second Hospital of Hebei Medical University, Shijiazhuang, China
- Neurological Laboratory of Hebei Province, Shijiazhuang, China
- *Correspondence: Xueqin Song,
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13
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Scalia F, Barone R, Rappa F, Marino Gammazza A, Lo Celso F, Lo Bosco G, Barone G, Antona V, Vadalà M, Vitale AM, Mangano GD, Amato D, Sentiero G, Macaluso F, Myburgh KH, Conway de Macario E, Macario AJL, Giuffrè M, Cappello F. Muscle Histopathological Abnormalities in a Patient With a CCT5 Mutation Predicted to Affect the Apical Domain of the Chaperonin Subunit. Front Mol Biosci 2022; 9:887336. [PMID: 35720129 PMCID: PMC9201415 DOI: 10.3389/fmolb.2022.887336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
Recognition of diseases associated with mutations of the chaperone system genes, e.g., chaperonopathies, is on the rise. Hereditary and clinical aspects are established, but the impact of the mutation on the chaperone molecule and the mechanisms underpinning the tissue abnormalities are not. Here, histological features of skeletal muscle from a patient with a severe, early onset, distal motor neuropathy, carrying a mutation on the CCT5 subunit (MUT) were examined in comparison with normal muscle (CTR). The MUT muscle was considerably modified; atrophy of fibers and disruption of the tissue architecture were prominent, with many fibers in apoptosis. CCT5 was diversely present in the sarcolemma, cytoplasm, and nuclei in MUT and in CTR and was also in the extracellular space; it colocalized with CCT1. In MUT, the signal of myosin appeared slightly increased, and actin slightly decreased as compared with CTR. Desmin was considerably delocalized in MUT, appearing with abnormal patterns and in precipitates. Alpha-B-crystallin and Hsp90 occurred at lower signals in MUT than in CTR muscle, appearing also in precipitates with desmin. The abnormal features in MUT may be the consequence of inactivity, malnutrition, denervation, and failure of protein homeostasis. The latter could be at least in part caused by malfunction of the CCT complex with the mutant CCT5 subunit. This is suggested by the results of the in silico analyses of the mutant CCT5 molecule, which revealed various abnormalities when compared with the wild-type counterpart, mostly affecting the apical domain and potentially impairing chaperoning functions. Thus, analysis of mutated CCT5 in vitro and in vivo is anticipated to provide additional insights on subunit involvement in neuromuscular disorders.
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Affiliation(s)
- Federica Scalia
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Rosario Barone
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
| | - Francesca Rappa
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
| | - Antonella Marino Gammazza
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
| | - Fabrizio Lo Celso
- Department of Physics and Chemistry - Emilio Segrè, University of Palermo, Palermo, Italy
- Ionic Liquids Laboratory, Institute of Structure of Matter, Italian National Research Council (ISM-CNR), Rome, Italy
| | - Giosuè Lo Bosco
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
- Department of Mathematics and Computer Science, University of Palermo, Palermo, Italy
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Palermo, Italy
| | - Vincenzo Antona
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy
| | - Maria Vadalà
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Alessandra Maria Vitale
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Giuseppe Donato Mangano
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
| | - Domenico Amato
- Department of Mathematics and Computer Science, University of Palermo, Palermo, Italy
| | - Giusy Sentiero
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
| | - Filippo Macaluso
- SMART Engineering Solutions & Technologies (SMARTEST) Research Center, eCampus University, Palermo, Italy
| | - Kathryn H. Myburgh
- Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa
| | - Everly Conway de Macario
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Baltimore, MD, United States
| | - Alberto J. L. Macario
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
- Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Baltimore, MD, United States
| | - Mario Giuffrè
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy
| | - Francesco Cappello
- Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, Palermo, Italy
- Euro-Mediterranean Institute of Science and Technology (IEMEST), Palermo, Italy
- *Correspondence: Francesco Cappello, @hotmail.com
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14
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Qian FY, Guo YD, Zu J, Zhang JH, Zheng YM, Abdoulaye IA, Pan ZH, Xie CM, Gao HC, Zhang ZJ. A novel recessive mutation affecting DNAJB6a causes myofibrillar myopathy. Acta Neuropathol Commun 2021; 9:23. [PMID: 33557929 PMCID: PMC7869515 DOI: 10.1186/s40478-020-01046-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 10/02/2020] [Indexed: 11/10/2022] Open
Abstract
Mutations in the DNAJB6 gene have been identified as rare causes of myofibrillar myopathies. However, the underlying pathophysiologica mechanisms remain elusive. DNAJB6 has two known isoforms, including the nuclear isoform DNAJB6a and the cytoplasmic isoform DNAJB6b, which was thought to be the pathogenic isoform. Here, we report a novel recessive mutation c.695_699del (p. Val 232 Gly fs*7) in the DNAJB6 gene, associated with an apparently recessively inherited late onset distal myofibrillar myopathy in a Chinese family. Notably, the novel mutation localizes to exon 9 and uniquely encodes DNAJB6a. We further identified that this mutation decreases the mRNA and protein levels of DNAJB6a and results in an age-dependent recessive toxic effect on skeletal muscle in knock-in mice. Moreover, the mutant DNAJB6a showed a dose-dependent anti-aggregation effect on polyglutamine-containing proteins in vitro. Taking together, these findings reveal the pathogenic role of DNAJB6a insufficiency in myofibrillar myopathies and expand upon the molecular spectrum of DNAJB6 mutations.
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15
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Bengoechea R, Findlay AR, Bhadra AK, Shao H, Stein KC, Pittman SK, Daw JA, Gestwicki JE, True HL, Weihl CC. Inhibition of DNAJ-HSP70 interaction improves strength in muscular dystrophy. J Clin Invest 2021; 130:4470-4485. [PMID: 32427588 DOI: 10.1172/jci136167] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 05/14/2020] [Indexed: 12/12/2022] Open
Abstract
Dominant mutations in the HSP70 cochaperone DNAJB6 cause a late-onset muscle disease termed limb-girdle muscular dystrophy type D1 (LGMDD1), which is characterized by protein aggregation and vacuolar myopathology. Disease mutations reside within the G/F domain of DNAJB6, but the molecular mechanisms underlying dysfunction are not well understood. Using yeast, cell culture, and mouse models of LGMDD1, we found that the toxicity associated with disease-associated DNAJB6 required its interaction with HSP70 and that abrogating this interaction genetically or with small molecules was protective. In skeletal muscle, DNAJB6 localizes to the Z-disc with HSP70. Whereas HSP70 normally diffused rapidly between the Z-disc and sarcoplasm, the rate of diffusion of HSP70 in LGMDD1 mouse muscle was diminished, probably because it had an unusual affinity for the Z-disc and mutant DNAJB6. Treating LGMDD1 mice with a small-molecule inhibitor of the DNAJ-HSP70 complex remobilized HSP70, improved strength, and corrected myopathology. These data support a model in which LGMDD1 mutations in DNAJB6 are a gain-of-function disease that is, counterintuitively, mediated via HSP70 binding. Thus, therapeutic approaches targeting HSP70-DNAJB6 may be effective in treating this inherited muscular dystrophy.
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Affiliation(s)
| | | | - Ankan K Bhadra
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Hao Shao
- Institute for Neurodegenerative Diseases, UCSF, San Francisco, California, USA
| | - Kevin C Stein
- Department of Biology, Stanford University, Stanford, California, USA
| | | | | | - Jason E Gestwicki
- Institute for Neurodegenerative Diseases, UCSF, San Francisco, California, USA
| | - Heather L True
- Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
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16
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Savarese M, Sarparanta J, Vihola A, Jonson PH, Johari M, Rusanen S, Hackman P, Udd B. Panorama of the distal myopathies. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2020; 39:245-265. [PMID: 33458580 PMCID: PMC7783427 DOI: 10.36185/2532-1900-028] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 12/15/2022]
Abstract
Distal myopathies are genetic primary muscle disorders with a prominent weakness at onset in hands and/or feet. The age of onset (from early childhood to adulthood), the distribution of muscle weakness (upper versus lower limbs) and the histological findings (ranging from nonspecific myopathic changes to myofibrillar disarrays and rimmed vacuoles) are extremely variable. However, despite being characterized by a wide clinical and genetic heterogeneity, the distal myopathies are a category of muscular dystrophies: genetic diseases with progressive loss of muscle fibers. Myopathic congenital arthrogryposis is also a form of distal myopathy usually caused by focal amyoplasia. Massive parallel sequencing has further expanded the long list of genes associated with a distal myopathy, and contributed identifying as distal myopathy-causative rare variants in genes more often related with other skeletal or cardiac muscle diseases. Currently, almost 20 genes (ACTN2, CAV3, CRYAB, DNAJB6, DNM2, FLNC, HNRNPA1, HSPB8, KHLH9, LDB3, MATR3, MB, MYOT, PLIN4, TIA1, VCP, NOTCH2NLC, LRP12, GIPS1) have been associated with an autosomal dominant form of distal myopathy. Pathogenic changes in four genes (ADSSL, ANO5, DYSF, GNE) cause an autosomal recessive form; and disease-causing variants in five genes (DES, MYH7, NEB, RYR1 and TTN) result either in a dominant or in a recessive distal myopathy. Finally, a digenic mechanism, underlying a Welander-like form of distal myopathy, has been recently elucidated. Rare pathogenic mutations in SQSTM1, previously identified with a bone disease (Paget disease), unexpectedly cause a distal myopathy when combined with a common polymorphism in TIA1. The present review aims at describing the genetic basis of distal myopathy and at summarizing the clinical features of the different forms described so far.
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Affiliation(s)
- Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Jaakko Sarparanta
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Anna Vihola
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
- Neuromuscular Research Center, Department of Genetics, Fimlab Laboratories, Tampere, Finland
| | - Per Harald Jonson
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Mridul Johari
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Salla Rusanen
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
| | - Bjarne Udd
- Folkhälsan Research Center, Helsinki, Finland
- Department of Medical Genetics, Medicum, University of Helsinki, Helsinki, Finland
- Department of Neurology, Vaasa Central Hospital, Vaasa, Finland
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17
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HSP40 proteins use class-specific regulation to drive HSP70 functional diversity. Nature 2020; 587:489-494. [DOI: 10.1038/s41586-020-2906-4] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 08/26/2020] [Indexed: 12/18/2022]
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18
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Chakravorty S, Nallamilli BRR, Khadilkar SV, Singla MB, Bhutada A, Dastur R, Gaitonde PS, Rufibach LE, Gloster L, Hegde M. Clinical and Genomic Evaluation of 207 Genetic Myopathies in the Indian Subcontinent. Front Neurol 2020; 11:559327. [PMID: 33250842 PMCID: PMC7674836 DOI: 10.3389/fneur.2020.559327] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/23/2020] [Indexed: 12/13/2022] Open
Abstract
Objective: Inherited myopathies comprise more than 200 different individually rare disease-subtypes, but when combined together they have a high prevalence of 1 in 6,000 individuals across the world. Our goal was to determine for the first time the clinical- and gene-variant spectrum of genetic myopathies in a substantial cohort study of the Indian subcontinent. Methods: In this cohort study, we performed the first large clinical exome sequencing (ES) study with phenotype correlation on 207 clinically well-characterized inherited myopathy-suspected patients from the Indian subcontinent with diverse ethnicities. Results: Clinical-correlation driven definitive molecular diagnosis was established in 49% (101 cases; 95% CI, 42–56%) of patients with the major contributing pathogenicity in either of three genes, GNE (28%; GNE-myopathy), DYSF (25%; Dysferlinopathy), and CAPN3 (19%; Calpainopathy). We identified 65 variant alleles comprising 37 unique variants in these three major genes. Seventy-eight percent of the DYSF patients were homozygous for the detected pathogenic variant, suggesting the need for carrier-testing for autosomal-recessive disorders like Dysferlinopathy that are common in India. We describe the observed clinical spectrum of myopathies including uncommon and rare subtypes in India: Sarcoglycanopathies (SGCA/B/D/G), Collagenopathy (COL6A1/2/3), Anoctaminopathy (ANO5), telethoninopathy (TCAP), Pompe-disease (GAA), Myoadenylate-deaminase-deficiency-myopathy (AMPD1), myotilinopathy (MYOT), laminopathy (LMNA), HSP40-proteinopathy (DNAJB6), Emery-Dreifuss-muscular-dystrophy (EMD), Filaminopathy (FLNC), TRIM32-proteinopathy (TRIM32), POMT1-proteinopathy (POMT1), and Merosin-deficiency-congenital-muscular-dystrophy-type-1 (LAMA2). Thirteen patients harbored pathogenic variants in >1 gene and had unusual clinical features suggesting a possible role of synergistic-heterozygosity/digenic-contribution to disease presentation and progression. Conclusions: Application of clinically correlated ES to myopathy diagnosis has improved our understanding of the clinical and genetic spectrum of different subtypes and their overlaps in Indian patients. This, in turn, will enhance the global gene-variant-disease databases by including data from developing countries/continents for more efficient clinically driven molecular diagnostics.
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Affiliation(s)
- Samya Chakravorty
- Emory University Department of Pediatrics, Atlanta, GA, United States.,Emory University Department of Human Genetics, Atlanta, GA, United States.,Division of Neurosciences, Children's Healthcare of Atlanta, Atlanta, GA, United States.,School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
| | | | - Satish Vasant Khadilkar
- Department of Neurology, Bombay Hospital, Mumbai, India.,Department of Neurology, Sir J J Group of Hospitals, Grant Medical College, Mumbai, India.,Bombay Hospital Institute of Medical Sciences, Mumbai, India
| | - Madhu Bala Singla
- Department of Neurology, Bombay Hospital, Mumbai, India.,Department of Neurology, Sir J J Group of Hospitals, Grant Medical College, Mumbai, India.,Bombay Hospital Institute of Medical Sciences, Mumbai, India
| | | | - Rashna Dastur
- Centre for Advanced Molecular Diagnostics in Neuromuscular Disorders (CAMDND), Mumbai, India
| | - Pradnya Satish Gaitonde
- Centre for Advanced Molecular Diagnostics in Neuromuscular Disorders (CAMDND), Mumbai, India
| | | | - Logan Gloster
- Emory University Department of Pediatrics, Atlanta, GA, United States.,School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
| | - Madhuri Hegde
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States.,PerkinElmer Genomics, Global Laboratory Services, Waltham, MA, United States
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19
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Rosenzweig R, Nillegoda NB, Mayer MP, Bukau B. The Hsp70 chaperone network. Nat Rev Mol Cell Biol 2020; 20:665-680. [PMID: 31253954 DOI: 10.1038/s41580-019-0133-3] [Citation(s) in RCA: 601] [Impact Index Per Article: 150.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The 70-kDa heat shock proteins (Hsp70s) are ubiquitous molecular chaperones that act in a large variety of cellular protein folding and remodelling processes. They function virtually at all stages of the life of proteins from synthesis to degradation and are thus crucial for maintaining protein homeostasis, with direct implications for human health. A large set of co-chaperones comprising J-domain proteins and nucleotide exchange factors regulate the ATPase cycle of Hsp70s, which is allosterically coupled to substrate binding and release. Moreover, Hsp70s cooperate with other cellular chaperone systems including Hsp90, Hsp60 chaperonins, small heat shock proteins and Hsp100 AAA+ disaggregases, together constituting a dynamic and functionally versatile network for protein folding, unfolding, regulation, targeting, aggregation and disaggregation, as well as degradation. In this Review we describe recent advances that have increased our understanding of the molecular mechanisms and working principles of the Hsp70 network. This knowledge showcases how the Hsp70 chaperone system controls diverse cellular functions, and offers new opportunities for the development of chemical compounds that modulate disease-related Hsp70 activities.
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Affiliation(s)
- Rina Rosenzweig
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.
| | - Nadinath B Nillegoda
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany.,German Cancer Research Center (DKFZ), Heidelberg, Germany.,DKFZ-ZMBH Alliance, Heidelberg, Germany.,Australian Regenerative Medicine Institute (ARMI), Monash University, Clayton, VIC, Australia
| | - Matthias P Mayer
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany.,DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Bernd Bukau
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany. .,German Cancer Research Center (DKFZ), Heidelberg, Germany. .,DKFZ-ZMBH Alliance, Heidelberg, Germany.
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20
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Neuromuscular Diseases Due to Chaperone Mutations: A Review and Some New Results. Int J Mol Sci 2020; 21:ijms21041409. [PMID: 32093037 PMCID: PMC7073051 DOI: 10.3390/ijms21041409] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 02/12/2020] [Accepted: 02/13/2020] [Indexed: 12/12/2022] Open
Abstract
Skeletal muscle and the nervous system depend on efficient protein quality control, and they express chaperones and cochaperones at high levels to maintain protein homeostasis. Mutations in many of these proteins cause neuromuscular diseases, myopathies, and hereditary motor and sensorimotor neuropathies. In this review, we cover mutations in DNAJB6, DNAJB2, αB-crystallin (CRYAB, HSPB5), HSPB1, HSPB3, HSPB8, and BAG3, and discuss the molecular mechanisms by which they cause neuromuscular disease. In addition, previously unpublished results are presented, showing downstream effects of BAG3 p.P209L on DNAJB6 turnover and localization.
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21
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Palmio J, Jonson PH, Inoue M, Sarparanta J, Bengoechea R, Savarese M, Vihola A, Jokela M, Nakagawa M, Noguchi S, Olivé M, Masingue M, Kerty E, Hackman P, Weihl CC, Nishino I, Udd B. Mutations in the J domain of DNAJB6 cause dominant distal myopathy. Neuromuscul Disord 2019; 30:38-46. [PMID: 31955980 DOI: 10.1016/j.nmd.2019.11.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 01/28/2023]
Abstract
Eight patients from five families with undiagnosed dominant distal myopathy underwent clinical, neurophysiological and muscle biopsy examinations. Molecular genetic studies were performed using targeted sequencing of all known myopathy genes followed by segregation of the identified mutations in the affected families using Sanger sequencing. Two novel mutations in DNAJB6 J domain, c.149C>T (p.A50V) and c.161A>C (p.E54A), were identified as the cause of disease. The muscle involvement with p.A50V was distal calf-predominant, and the p.E54A was more proximo-distal. Histological findings were similar to those previously reported in DNAJB6 myopathy. In line with reported pathogenic mutations in the glycine/phenylalanine (G/F) domain of DNAJB6, both the novel mutations showed reduced anti-aggregation capacity by filter trap assay and TDP-43 disaggregation assays. Modeling of the protein showed close proximity of the mutated residues with the G/F domain. Myopathy-causing mutations in DNAJB6 are not only located in the G/F domain, but also in the J domain. The identified mutations in the J domain cause dominant distal and proximo-distal myopathy, confirming that mutations in DNAJB6 should be considered in distal myopathy cases.
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Affiliation(s)
- Johanna Palmio
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland.
| | - Per Harald Jonson
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Michio Inoue
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Jaakko Sarparanta
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Rocio Bengoechea
- Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA
| | - Marco Savarese
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Anna Vihola
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Manu Jokela
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Division of Clinical Neurosciences, Turku University Hospital and University of Turku, Turku, Finland
| | - Masanori Nakagawa
- North Medical Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Satoru Noguchi
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Montse Olivé
- Department of Pathology and Neuromuscular Unit, IDIBELL-Hospital de Bellvitge, Barcelona, Spain
| | - Marion Masingue
- University Hospital of Salpêtrière, UPMC, Institute of Myology, National Reference Center for Neuromuscular Disorders, Paris, France
| | - Emilia Kerty
- Department of Neurology, Oslo University Hospital, Rikshospitalet, University of Oslo, Oslo, Norway
| | - Peter Hackman
- Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
| | - Conrad C Weihl
- Department of Neurology, Washington University in St. Louis, St. Louis, MO, USA
| | - Ichizo Nishino
- National Center of Neurology and Psychiatry (NCNP), Department of Neuromuscular Research, National Institute of Neuroscience, Tokyo, Japan
| | - Bjarne Udd
- Neuromuscular Research Center, Tampere University Hospital and Tampere University, P.O. box 100, FIN-33014 Tampere, Finland; Folkhälsan Research Center, Helsinki, Finland and University of Helsinki, Medicum, Helsinki, Finland
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22
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Papsdorf K, Sima S, Schmauder L, Peter S, Renner L, Hoffelner P, Richter K. head-bent resistant Hsc70 variants show reduced Hsp40 affinity and altered protein folding activity. Sci Rep 2019; 9:11955. [PMID: 31420580 PMCID: PMC6697693 DOI: 10.1038/s41598-019-48109-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 07/25/2019] [Indexed: 01/19/2023] Open
Abstract
The molecular chaperone Hsc70 performs essential tasks by folding proteins. Hsc70 is driven by the hydrolysis of ATP and tuned by the association with various co-chaperones. One such cofactor is the nematode nucleotide exchange factor UNC-23, whose mutation disrupts muscle attachment and induces a severe head-bent phenotype in C.elegans. Interestingly, four mutations in Hsc70 can suppress this phenotype, but the molecular mechanism underlying this suppression is unknown. Here we characterize these four suppressor variants, Hsc70 D233N, S321F, A379V and D384N. In vitro only Hsc70 S321F shows reduced stability and altered nucleotide interaction, but all mutations affect the ATPase stimulation. In particular, Hsc70 D233N and Hsc70 A379V show strongly reduced interactions with DNJ-12 and DNJ-13. Nucleotide exchange factor binding instead is barely influenced in Hsc70 D233N, A379V and D384N and their chaperone activity is preserved. Molecular dynamics simulations suggest that effects in Hsc70 S321F and Hsc70 A379V originate from steric clashes in the vicinity of the mutation site, while D233N disrupts a salt bridge that contributes to Hsc70’s nucleotide-induced conformational changes. In summary, the analyzed mutants show altered ATPase and refolding activity caused by changes in Hsp40 binding.
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Affiliation(s)
- Katharina Papsdorf
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany.,Stanford University School of Medicine, Department of Genetics, 300 Pasteur Drive, Stanford, CA, 94305, USA
| | - Siyuan Sima
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Lukas Schmauder
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Sebastian Peter
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Lisa Renner
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Patrica Hoffelner
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany
| | - Klaus Richter
- Center for integrated protein research at the Department of Chemie, Technische Universität München, Lichtenbergstr. 4, 85748, Garching, Germany.
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23
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Angelini C, Pegoraro V, Cenacchi G. The clinical and molecular spectrum of autosomal dominant limb-girdle muscular dystrophies focusing on transportinopathy. Expert Opin Orphan Drugs 2019. [DOI: 10.1080/21678707.2019.1622412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | | | - Giovanna Cenacchi
- Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum–University of Bologna, Bologna, Italy
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24
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Intrafamilial variability of limb-girdle muscular dystrophy, LGMD1D type. Eur J Med Genet 2019; 63:103655. [PMID: 31034989 DOI: 10.1016/j.ejmg.2019.04.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 04/12/2019] [Accepted: 04/21/2019] [Indexed: 12/20/2022]
Abstract
LGMD1D is an autosomal dominant limb girdle muscular dystrophy caused by variants in the DNAJB6 gene. This is typically an adult-onset disorder characterized by moderately progressive proximal muscle weakness without respiratory or bulbar involvement; however phenotypic variability is often observed with some individuals having earlier onset and more severe symptoms. Here, we present a family with a novel NM_005494.2:c.271T > G p.(Phe91Val) variant in DNAJB6 with a late-onset, mild and slowly progressive form of the disease, including one individual, who in her 7th decade of life has subclinical LGMD1D with only mild features on muscle biopsy and MRI. Unlike previously reported cases where missense variants affecting the Phe91 amino acid residue are associated with a more severe form of the disease, this family represents the mild end of the LGMD1D clinical spectrum. Therefore, this family adds further complexity to the genotype-phenotype correlation in DNAJB6-associated muscular dystrophies.
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25
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Kumar J, Kline NL, Masison DC. Human DnaJB6 Antiamyloid Chaperone Protects Yeast from Polyglutamine Toxicity Separately from Spatial Segregation of Aggregates. Mol Cell Biol 2018; 38:e00437-18. [PMID: 30224519 PMCID: PMC6234286 DOI: 10.1128/mcb.00437-18] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 09/07/2018] [Accepted: 09/10/2018] [Indexed: 02/06/2023] Open
Abstract
Polyglutamine (polyQ) aggregates are associated with pathology in protein-folding diseases and with toxicity in the yeast Saccharomyces cerevisiae Protection from polyQ toxicity in yeast by human DnaJB6 coincides with sequestration of aggregates. Gathering of misfolded proteins into deposition sites by protein quality control (PQC) factors has led to the view that PQC processes protect cells by spatially segregating toxic aggregates. Whether DnaJB6 depends on this machinery to sequester polyQ aggregates, if this sequestration is needed for DnaJB6 to protect cells, and the identity of the deposition site are unknown. Here, we found DnaJB6-driven deposits share characteristics with perivacuolar insoluble protein deposition sites (IPODs). Binding of DnaJB6 to aggregates was necessary, but not enough, for detoxification. Focal formation required a DnaJB6-Hsp70 interaction and actin, polyQ could be detoxified without sequestration, and segregation of aggregates alone was not protective. Our findings suggest DnaJB6 binds to smaller polyQ aggregates to block their toxicity. Assembly and segregation of detoxified aggregates are driven by an Hsp70- and actin-dependent process. Our findings show sequestration of aggregates is not the primary mechanism by which DnaJB6 suppresses toxicity and raise questions regarding how and when misfolded proteins are detoxified during spatial segregation.
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Affiliation(s)
- Jyotsna Kumar
- Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Neila L Kline
- Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Daniel C Masison
- Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
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26
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Carvalho AADS, Lacene E, Brochier G, Labasse C, Madelaine A, Silva VGD, Corazzini R, Papadopoulos K, Behin A, Laforêt P, Stojkovic T, Eymard B, Fardeau M, Romero N. Genetic Mutations and Demographic, Clinical, and Morphological Aspects of Myofibrillar Myopathy in a French Cohort. Genet Test Mol Biomarkers 2018; 22:374-383. [PMID: 29924655 DOI: 10.1089/gtmb.2018.0004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Protein aggregate myopathies (PAM) represent a group of familial or sporadic neuromuscular conditions with marked clinical and genetic heterogeneity that occur in children and adults. Familial PAM includes myofibrillar myopathies defined by the presence of desmin-positive protein aggregates and degenerative intermyofibrillar network changes. PAM is often caused by dysfunctional genes, such as DES, PLEC 1, CRYAB, FLNC, MYOT, ZASP, BAG3, FHL1, and DNAJB6. OBJECTIVE To retrospectively analyze genetic mutations and demographic, clinical, and morphological aspects of PAM in a French population. METHODS Forty-eight PAM patients (29 men, 19 women) were divided into two groups, those with genetically (GIM) and nongenetically identified (NGIM) mutations associated with myofibrillar myopathy. RESULTS Age of myopathy onset ranged from 13 to 68 years. GIM group mutations (81.25%) included DES (14), ZASP (8), FLNC (4), MYOT (4), BAG3 (1), CRYAB (2), and DNAJB6 (6). The MYOT subgroup displayed a significantly older onset age (p = 0.029). Autosomal dominant inheritance was found in 74.3% of GIM and 44.4% of NGIM subjects. Overall, 22.9% had Maghrebian heritage, 72.9% Caucasian, and 4.2% Asian. The most common clinical sign was distal muscle weakness (66%) followed by simultaneous distal and proximal weakness in 49%. Eleven patients had contractures, one had a rigid spine, and five had respiratory dysfunction. GIM subjects had greater cardiac involvement (51.7%) versus the NGIM group (33.3%). The average serum creatine kinase level was 393 U/L in GIM and 382 U/L in NGIM subjects. Morphological analysis showed significant differences among GIM subgroups, including the number of vacuoles and regenerated fibers (ZASP), group atrophy (ZASP), and rubbed out fibers (MYOT). Ultrastructural findings showed significant differences in intranuclear rods, Z-disc thickness, and intranuclear inclusions between gene mutation subgroups. Paracrystalline inclusions were present in three patients (DNAJB6). The most frequent mutation in was in DES, followed by ZASP. CONCLUSIONS GIM and NGIM PAM subjects showed similar results, suggesting that any unknown genes, which cause this disease have characteristics similar to those already described. Considering the complexity of clinical, morphological, and genetic data related to PAM, particularly myofibrillar myopathies, physicians should be careful when diagnosing patients with sporadic PAM.
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Affiliation(s)
- Alzira Alves de Siqueira Carvalho
- 1 Laboratório de Doenças Neuromusculares da Faculdade de Medicina do ABC , Departamento de Neurociências, Santo André, Brazil .,2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Emmanuele Lacene
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Guy Brochier
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Clémance Labasse
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Angeline Madelaine
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Vinicius Gomes da Silva
- 3 Laboratório de Doenças Neuromusculares da Faculdade de Medicina do ABC , Departamento de Neurociências, Santo André, Brazil
| | - Roseli Corazzini
- 3 Laboratório de Doenças Neuromusculares da Faculdade de Medicina do ABC , Departamento de Neurociências, Santo André, Brazil
| | - Konstantinos Papadopoulos
- 4 Centre de Référence de Pathologie Neuromusculaire Paris-Est, Groupe Hospitalier Pitié-Salpêtrière , Institut de Myologie, Paris, France
| | - Anthony Behin
- 4 Centre de Référence de Pathologie Neuromusculaire Paris-Est, Groupe Hospitalier Pitié-Salpêtrière , Institut de Myologie, Paris, France
| | - Pascal Laforêt
- 4 Centre de Référence de Pathologie Neuromusculaire Paris-Est, Groupe Hospitalier Pitié-Salpêtrière , Institut de Myologie, Paris, France
| | - Tania Stojkovic
- 4 Centre de Référence de Pathologie Neuromusculaire Paris-Est, Groupe Hospitalier Pitié-Salpêtrière , Institut de Myologie, Paris, France
| | - Bruno Eymard
- 4 Centre de Référence de Pathologie Neuromusculaire Paris-Est, Groupe Hospitalier Pitié-Salpêtrière , Institut de Myologie, Paris, France
| | - Michel Fardeau
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
| | - Norma Romero
- 2 Laboratoire de Pathologie Musculaire Risler, Groupe Hospitalier Pitié-Salpêtrière , Paris, France
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27
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Kim K, Choi YC. The Author Reply: Genotypic and Phenotypic Heterogeneity of LGMD1D due to DNAJB6 Mutations. Yonsei Med J 2018; 59:1010-1011. [PMID: 30187711 PMCID: PMC6127422 DOI: 10.3349/ymj.2018.59.8.1010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Indexed: 11/27/2022] Open
Affiliation(s)
- Kitae Kim
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Young Chul Choi
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
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28
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Affiliation(s)
- Josef Finsterer
- Krankenanstalt Rudolfstiftung, Messerli Institute, Veterinary University of Vienna, Vienna, Austria.
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29
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BOHLEGA SAEEDA, ALFAWAZ SARAH, ABOU-AL-SHAAR HUSSAM, AL-HINDI HINDIN, MURAD HATEMN, BOHLEGA MOHAMEDS, MEYER BRIANF, MONIES DOROTA. LGMD1D myopathy with cytoplasmic and nuclear inclusions in a Saudi family due to DNAJB6 mutation. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2018; 37:221-226. [PMID: 30838352 PMCID: PMC6390114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Autosomal dominant LGMD1D has been described in multiple families in Asia, Europe, and USA. However, to the best of our knowledge, no cases of LGMD1D have been reported among native Bedouin Saudi families. Fifty Saudi families with LGMD were analyzed and the causative underlying genes were studied utilizing genome wide linkage, homozygosity mapping, and neurological gene panel. We identified one family of a Bedouin origin with LGMD1D. Two patients had progressive proximal and distal weakness, dysphagia, and respiratory symptoms. Creatinine kinase was normal. Muscle biopsy showed marked variation in myofibers size with scattered angular atrophic fiber, necrotic fibers, and myophagocytosis, with red-rimmed vacuoles depicting a sarcoplasmic body. Heterozygous c.C287T (p.P96L) variant in exon 5 of DNAJB6 (NM_005494) gene was found. This change is localized within glycine and phenylalanine rich domain and alter an amino acid residue. Our findings will expand on the existing genotypic and phenotypic spectrum of this disorder and aid in elucidating hidden mechanisms implicated in LGMD1D.
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Affiliation(s)
- SAEED A. BOHLEGA
- Division of Neurology, Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia,Address for correspondence: Saeed A. Bohlega, MD, FRCPC, FAAN, Division of Neurology, Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, P.O. Box: 3354; Riyadh 11211, Saudi Arabia. Tel. +966-11-464-7272, Ext: 32819. Fax: +966-11-442-4763. E-mail:
| | - SARAH ALFAWAZ
- Division of Neurology, Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - HUSSAM ABOU-AL-SHAAR
- Department of Neurosurgery, Hofstra Northwell School of Medicine, Manhasset, New York, USA
| | - HINDI N. AL-HINDI
- Department of Pathology & Laboratory Medicine, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia
| | - HATEM N. MURAD
- Division of Neurology, Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - MOHAMED S. BOHLEGA
- Division of Neurology, Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - BRIAN F. MEYER
- Department of Genetics, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia, Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - DOROTA MONIES
- Department of Genetics, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia, Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
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30
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Kim K, Park HJ, Lee JH, Hong J, Ahn SW, Choi YC. Two Korean Families with Limb-Girdle Muscular Dystrophy Type 1D Associated with DNAJB6 Mutations. Yonsei Med J 2018; 59:698-701. [PMID: 29869469 PMCID: PMC5990685 DOI: 10.3349/ymj.2018.59.5.698] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 03/02/2018] [Accepted: 03/13/2018] [Indexed: 01/02/2023] Open
Abstract
Limb-girdle muscular dystrophies (LGMD) are heterogeneous disorders with autosomal inheritance. Autosomal dominant LGMD mapped to 7q36.3 has been classified as LGMD type 1D (LGMD1D) in the Human Gene Nomenclature Committee Database. LGMD1D is characterized predominantly by limb-girdle weakness and may also show a bulbar symptom in some cases. In the past, the frequency of this disease was uncommon, and this disorder was mainly found in Europe and the United States. However, recently, this disorder has been reported in Asia, including Japan, Korea, and Taiwan. Here, we report on three LGMD1D patients, including one with a novel mutation in DNAJB6, c.298T>A. While two patients complained of limb-girdle weakness, as would be expected, one patient had distal weakness. They had various serum creatine kinase levels. Radiologic findings in one patient showed fatty degeneration and atrophy in the posterior part of distal muscles. Pathologic findings in one of the patients showed rimmed vacuoles. Although LGMD1D is still uncommon in Korea, we discovered three Korean patients with LGMD1D, including one novel mutation in DNAJB6, p.Phe100Ile (c.298T>A).
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Affiliation(s)
- Kitae Kim
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Hyung Jun Park
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Jung Hwan Lee
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Jiman Hong
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
| | - Suk Won Ahn
- Department of Neurology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea
| | - Young Chul Choi
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
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31
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Jonson PH, Palmio J, Johari M, Penttilä S, Evilä A, Nelson I, Bonne G, Wiart N, Meyer V, Boland A, Deleuze JF, Masson C, Stojkovic T, Chapon F, Romero NB, Solé G, Ferrer X, Ferreiro A, Hackman P, Richard I, Udd B. Novel mutations in DNAJB6
cause LGMD1D and distal myopathy in French families. Eur J Neurol 2018; 25:790-794. [DOI: 10.1111/ene.13598] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 01/19/2018] [Indexed: 01/24/2023]
Affiliation(s)
- P. H. Jonson
- Folkhälsan Institute of Genetics; University of Helsinki, Medicum; Helsinki Finland
| | - J. Palmio
- Neuromuscular Research Center; Tampere University Hospital; University of Tampere; Tampere Finland
| | - M. Johari
- Folkhälsan Institute of Genetics; University of Helsinki, Medicum; Helsinki Finland
| | - S. Penttilä
- Neuromuscular Research Center; Tampere University Hospital; University of Tampere; Tampere Finland
| | - A. Evilä
- Folkhälsan Institute of Genetics; University of Helsinki, Medicum; Helsinki Finland
| | - I. Nelson
- UPMC Univ Paris 06; INSERM UMRS 974; Center of Research in Myology; Institut de Myologie; Sorbonne Universités; Paris France
| | - G. Bonne
- UPMC Univ Paris 06; INSERM UMRS 974; Center of Research in Myology; Institut de Myologie; Sorbonne Universités; Paris France
| | - N. Wiart
- Centre National de Recherche en Génomique Humaine (CNRGH); CEA; Evry France
| | - V. Meyer
- Centre National de Recherche en Génomique Humaine (CNRGH); CEA; Evry France
| | - A. Boland
- Centre National de Recherche en Génomique Humaine (CNRGH); CEA; Evry France
| | - J.-F. Deleuze
- Centre National de Recherche en Génomique Humaine (CNRGH); CEA; Evry France
| | - C. Masson
- Bioinformatics Core Facility; INSERM US24/CNRS UMS3633; INSERM UMR 1163; Institut Imagine; Université Paris Descartes − Structure Fédérative de Recherche Necker; Paris France
| | - T. Stojkovic
- UPMC Univ Paris 06; INSERM UMRS 974; Center of Research in Myology; Institut de Myologie; Sorbonne Universités; Paris France
| | - F. Chapon
- INSERM U1075; Neuromuscular Competence Center; CHU Caen; Université de Normandie; Caen France
| | - N. B. Romero
- Unit of Neuromuscular Morphology; Institute of Myology; UPMC Paris 6; INSERM UMRS 974; Pitié-Salpêtrière Hospital; Paris France
| | - G. Solé
- Neuromuscular Reference Center; CHU Bordeaux; Bordeaux France
| | - X. Ferrer
- Neuromuscular Reference Center; CHU Bordeaux; Bordeaux France
| | - A. Ferreiro
- Unité de Biologie Fonctionnelle et Adaptative; Université Paris Diderot/CNRS; Paris France
- Reference Center for Neuromuscular Disorders; Pitié-Salpêtrière Hospital; AP-HP; Paris France
| | - P. Hackman
- Folkhälsan Institute of Genetics; University of Helsinki, Medicum; Helsinki Finland
| | - I. Richard
- Généthon INSERM; U951; INTEGRARE Research Unit; University Paris-Saclay; Evry France
| | - B. Udd
- Folkhälsan Institute of Genetics; University of Helsinki, Medicum; Helsinki Finland
- Neuromuscular Research Center; Tampere University Hospital; University of Tampere; Tampere Finland
- Department of Neurology; Vaasa Central Hospital; Vaasa Finland
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32
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Meng E, Shevde LA, Samant RS. Emerging roles and underlying molecular mechanisms of DNAJB6 in cancer. Oncotarget 2018; 7:53984-53996. [PMID: 27276715 PMCID: PMC5288237 DOI: 10.18632/oncotarget.9803] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 05/26/2016] [Indexed: 12/29/2022] Open
Abstract
DNAJB6 also known as mammalian relative of DnaJ (MRJ) encodes a highly conserved member of the DnaJ/Hsp40 family of co-chaperone proteins that function with Hsp70 chaperones. DNAJB6 is widely expressed in all tissues, with higher expression levels detected in the brain. DNAJB6 is involved in diverse cellular functions ranging from murine placental development, reducing the formation and toxicity of mis-folded protein aggregates, to self-renewal of neural stem cells. Involvement of DNAJB6 is implicated in multiple pathologies such as Huntington's disease, Parkinson's diseases, limb-girdle muscular dystrophy, cardiomyocyte hypertrophy and cancer. This review summarizes the important involvement of the spliced isoforms of DNAJB6 in various pathologies with a specific focus on the emerging roles of human DNAJB6 in cancer and the underlying molecular mechanisms.
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Affiliation(s)
- Erhong Meng
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Beijing DOING Biomedical Technology Co. Ltd., Beijing,China
| | - Lalita A Shevde
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Rajeev S Samant
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, USA
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33
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Zarouchlioti C, Parfitt DA, Li W, Gittings LM, Cheetham ME. DNAJ Proteins in neurodegeneration: essential and protective factors. Philos Trans R Soc Lond B Biol Sci 2018; 373:20160534. [PMID: 29203718 PMCID: PMC5717533 DOI: 10.1098/rstb.2016.0534] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/08/2017] [Indexed: 12/16/2022] Open
Abstract
Maintenance of protein homeostasis is vitally important in post-mitotic cells, particularly neurons. Neurodegenerative diseases such as polyglutamine expansion disorders-like Huntington's disease or spinocerebellar ataxia (SCA), Alzheimer's disease, fronto-temporal dementia (FTD), amyotrophic lateral sclerosis (ALS) and Parkinson's disease-are often characterized by the presence of inclusions of aggregated protein. Neurons contain complex protein networks dedicated to protein quality control and maintaining protein homeostasis, or proteostasis. Molecular chaperones are a class of proteins with prominent roles in maintaining proteostasis, which act to bind and shield hydrophobic regions of nascent or misfolded proteins while allowing correct folding, conformational changes and enabling quality control. There are many different families of molecular chaperones with multiple functions in proteostasis. The DNAJ family of molecular chaperones is the largest chaperone family and is defined by the J-domain, which regulates the function of HSP70 chaperones. DNAJ proteins can also have multiple other protein domains such as ubiquitin-interacting motifs or clathrin-binding domains leading to diverse and specific roles in the cell, including targeting client proteins for degradation via the proteasome, chaperone-mediated autophagy and uncoating clathrin-coated vesicles. DNAJ proteins can also contain ER-signal peptides or mitochondrial leader sequences, targeting them to specific organelles in the cell. In this review, we discuss the multiple roles of DNAJ proteins and in particular focus on the role of DNAJ proteins in protecting against neurodegenerative diseases caused by misfolded proteins. We also discuss the role of DNAJ proteins as direct causes of inherited neurodegeneration via mutations in DNAJ family genes.This article is part of the theme issue 'Heat shock proteins as modulators and therapeutic targets of chronic disease: an integrated perspective'.
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Affiliation(s)
| | - David A Parfitt
- UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1 V 9EL, UK
| | - Wenwen Li
- UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1 V 9EL, UK
| | - Lauren M Gittings
- UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1 V 9EL, UK
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34
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Kojima Y, Noto YI, Takewaki D, Tokuda N, Shiga K, Hamano A, Mizuta I, Muranishi M, Kasai T, Nakagawa M, Mizuno T. Characteristic Posterior-dominant Lower Limb Muscle Involvement in Limb-girdle Muscular Dystrophy due to a DNAJB6 Phe93Leu Mutation. Intern Med 2017; 56:2347-2351. [PMID: 28794355 PMCID: PMC5635313 DOI: 10.2169/internalmedicine.6957-15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A 41-year-old man presented with gradually progressing proximal-dominant lower limb atrophy and weakness. His brother, mother and maternal aunt had the same symptoms. A physical examination and muscle imaging (CT and ultrasound) showed selective muscle involvement of the bilateral paraspinal, gluteus and posterior groups of lower limb muscles. Based on the characteristic muscle involvement pattern, the clinical findings and the muscle biopsy results, we made a straightforward diagnosis of limb-girdle muscular dystrophy (LGMD) due to a DNAJB6 Phe93Leu mutation based on a targeted gene analysis. In the differential diagnosis of adult-onset LGMD syndromes, in addition to investigating the family history, it is important to perform an extensive physical examination to determine the pattern of muscle involvement, and to perform a muscle biopsy. Our case suggests that posterior-dominant lower limb muscle impairment with gluteus and truncal muscle involvement and the detection of rimmed vacuoles on a muscle biopsy could be clues for the diagnosis of LGMD due to DNAJB6 mutations.
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Affiliation(s)
- Yuta Kojima
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Yu-Ichi Noto
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Daiki Takewaki
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Naoki Tokuda
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Kensuke Shiga
- Department of Medical Education & Primary Care, Kyoto Prefectural University of Medicine, Japan
| | - Ai Hamano
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Ikuko Mizuta
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Manabu Muranishi
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Takashi Kasai
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
| | - Masanori Nakagawa
- North Medical Center, Kyoto Prefectural University of Medicine, Japan
| | - Toshiki Mizuno
- Department of Neurology, Kyoto Prefectural University of Medicine, Japan
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Tsai PC, Tsai YS, Soong BW, Huang YH, Wu HT, Chen YH, Lin KP, Liao YC, Lee YC. A novelDNAJB6mutation causes dominantly inherited distal-onset myopathy and compromises DNAJB6 function. Clin Genet 2017; 92:150-157. [DOI: 10.1111/cge.13001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 02/17/2017] [Accepted: 02/20/2017] [Indexed: 12/30/2022]
Affiliation(s)
- P.-C. Tsai
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
- Brain Research Center; National Yang-Ming University; Taipei Taiwan
| | - Y.-S. Tsai
- Center for Systems and Synthetic Biology; National Yang-Ming University; Taipei Taiwan
| | - B.-W. Soong
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
- Brain Research Center; National Yang-Ming University; Taipei Taiwan
| | - Y.-H. Huang
- Center for Systems and Synthetic Biology; National Yang-Ming University; Taipei Taiwan
- Institute of Biomedical Informatics; National Yang-Ming University; Taipei Taiwan
| | - H.-T. Wu
- Department of Radiology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Radiology; National Yang-Ming University School of Medicine; Taipei Taiwan
| | - Y.-H. Chen
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
| | - K.-P. Lin
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
| | - Y.-C. Liao
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
| | - Y.-C. Lee
- Department of Neurology; Taipei Veterans General Hospital; Taipei Taiwan
- Department of Neurology; National Yang-Ming University School of Medicine; Taipei Taiwan
- Brain Research Center; National Yang-Ming University; Taipei Taiwan
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Ruggieri A, Saredi S, Zanotti S, Pasanisi MB, Maggi L, Mora M. DNAJB6 Myopathies: Focused Review on an Emerging and Expanding Group of Myopathies. Front Mol Biosci 2016; 3:63. [PMID: 27747217 PMCID: PMC5043021 DOI: 10.3389/fmolb.2016.00063] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 09/20/2016] [Indexed: 12/16/2022] Open
Abstract
Mutations in the DNAJB6 gene have been associated with the autosomal dominant limb girdle muscular dystrophy type 1D (LGMD1D), a disorder characterized by abnormal protein aggregates and rimmed vacuoles in muscle fibers. DNAJB6 is a ubiquitously expressed Hsp40 co-chaperone characterized by a J domain that specifies Hsp70 functions in the cellular environment. DNAJB6 is also a potent inhibitor of expanded polyglutamine (polyQ) aggregation preventing aggregate toxicity in cells. In DNAJB6-mutated patients this anti-aggregation property is significantly reduced, albeit not completely lost. To elucidate the pathogenetic mechanisms underlying the DNAJB6-related myopathy, animal models have been created showing that, indeed, conditional muscular expression of a DNAJB6 mutant in the mouse causes a LGMD1D myofibrillary muscle tissue phenotype. Both mutations and phenotypes reported until recently were rather homogeneous, being exclusively missense mutations of a few amino acids of the protein G/F domain, and with a phenotype characterized by adult-onset slowly progressive muscular dystrophy predominantly affecting proximal muscles. Lately, several novel mutations and new phenotypes of DNAJB6 have been described. These mutations once more affect the G/F domain of DNAJB6 with missense changes and a splice site mutation; and the phenotypes include childhood onset and distal involvement of muscles, or childhood-onset LGMD1D with loss of ambulation in early adulthood and respiratory involvement. Thus, the spectrum of DNAJB6-related phenotypes is widening. Although our knowledge about the role of DNAJB6 in the pathogenesis of muscle diseases has made great progression, several questions remain unsolved, including why a ubiquitous protein affects only, or predominantly, skeletal muscle; why only the G/F domain is involved; and what is the possible role of the DNAJB6a isoform. Clarification of these issues will provide clues to implement possible therapeutic strategies for DNAJB6-related myopathies.
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Affiliation(s)
- Alessandra Ruggieri
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
| | - Simona Saredi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
| | - Simona Zanotti
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
| | - Maria Barbara Pasanisi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
| | - Lorenzo Maggi
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
| | - Marina Mora
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta Milan, Italy
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Reidy M, Sharma R, Roberts BL, Masison DC. Human J-protein DnaJB6b Cures a Subset of Saccharomyces cerevisiae Prions and Selectively Blocks Assembly of Structurally Related Amyloids. J Biol Chem 2015; 291:4035-47. [PMID: 26702057 DOI: 10.1074/jbc.m115.700393] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Indexed: 11/06/2022] Open
Abstract
Human chaperone DnaJB6, an Hsp70 co-chaperone whose defects cause myopathies, protects cells from polyglutamine toxicity and prevents purified polyglutamine and Aβ peptides from forming amyloid. Yeast prions [URE3] and [PSI(+)] propagate as amyloid forms of Ure2 and Sup35 proteins, respectively. Here we find DnaJB6-protected yeast cells from polyglutamine toxicity and cured yeast of both [URE3] prions and weak variants of [PSI(+)] prions but not strong [PSI(+)] prions. Weak and strong variants of [PSI(+)] differ only in the structural conformation of their amyloid cores. In line with its anti-prion effects, DnaJB6 prevented purified Sup35NM from forming amyloids at 37 °C, which produce predominantly weak [PSI(+)] variants when used to infect yeast, but not at 4 °C, which produces mostly strong [PSI(+)] variants. Thus, structurally distinct amyloids composed of the same protein were differentially sensitive to the anti-amyloid activity of DnaJB6 both in vitro and in vivo. These findings have important implications for strategies using DnaJB6 as a target for therapy in amyloid disorders.
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Affiliation(s)
- Michael Reidy
- From the Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
| | - Ruchika Sharma
- From the Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
| | - Brittany-Lee Roberts
- From the Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
| | - Daniel C Masison
- From the Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892
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Bengoechea R, Pittman SK, Tuck EP, True HL, Weihl CC. Myofibrillar disruption and RNA-binding protein aggregation in a mouse model of limb-girdle muscular dystrophy 1D. Hum Mol Genet 2015; 24:6588-602. [PMID: 26362252 PMCID: PMC4634370 DOI: 10.1093/hmg/ddv363] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 09/02/2015] [Accepted: 09/02/2015] [Indexed: 12/15/2022] Open
Abstract
Limb-girdle muscular dystrophy type 1D (LGMD1D) is caused by dominantly inherited missense mutations in DNAJB6, an Hsp40 co-chaperone. LGMD1D muscle has rimmed vacuoles and inclusion bodies containing DNAJB6, Z-disc proteins and TDP-43. DNAJB6 is expressed as two isoforms; DNAJB6a and DNAJB6b. Both isoforms contain LGMD1D mutant residues and are expressed in human muscle. To identify which mutant isoform confers disease pathogenesis and generate a mouse model of LGMD1D, we evaluated DNAJB6 expression and localization in skeletal muscle as well as generating DNAJB6 isoform specific expressing transgenic mice. DNAJB6a localized to myonuclei while DNAJB6b was sarcoplasmic. LGMD1D mutations in DNAJB6a or DNAJB6b did not alter this localization in mouse muscle. Transgenic mice expressing the LGMD1D mutant, F93L, in DNAJB6b under a muscle-specific promoter became weak, had early lethality and developed muscle pathology consistent with myopathy after 2 months; whereas mice expressing the same F93L mutation in DNAJB6a or overexpressing DNAJB6a or DNAJB6b wild-type transgenes remained unaffected after 1 year. DNAJB6b localized to the Z-disc and DNAJB6b-F93L expressing mouse muscle had myofibrillar disorganization and desmin inclusions. Consistent with DNAJB6 dysfunction, keratin 8/18, a DNAJB6 client also accumulated in DNAJB6b-F93L expressing mouse muscle. The RNA-binding proteins hnRNPA1 and hnRNPA2/B1 accumulated and co-localized with DNAJB6 at sarcoplasmic stress granules suggesting that these proteins maybe novel DNAJB6b clients. Similarly, hnRNPA1 and hnRNPA2/B1 formed sarcoplasmic aggregates in patients with LGMD1D. Our data support that LGMD1D mutations in DNAJB6 disrupt its sarcoplasmic function suggesting a role for DNAJB6b in Z-disc organization and stress granule kinetics.
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Affiliation(s)
| | | | | | - Heather L True
- Department of Cell Biology and Physiology and and The Hope Center for Neurological Diseases, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Conrad C Weihl
- Department of Neurology, The Hope Center for Neurological Diseases, Washington University School of Medicine, St Louis, MO 63110, USA
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