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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; 33:1195-1206. [PMID: 38621658 PMCID: PMC11227618 DOI: 10.1093/hmg/ddae061] [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: 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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2
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Li Y, Yu B, Li H, Hou W, Yin J, Zhou Y, Yu Z. Human milk exosome-derived circDNAJB6 improves bronchopulmonary dysplasia model by promoting DNAJB6 gene transcription. J Bioenerg Biomembr 2024; 56:171-180. [PMID: 38244155 DOI: 10.1007/s10863-024-10002-5] [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] [Accepted: 01/09/2024] [Indexed: 01/22/2024]
Abstract
To verify the protective effect of circDNAJB6 on Bronchopulmonary dysplasia (BPD) cell and animal models and to explore the possible mechanism of its protective effect. The function of circDNAJB6 was investigated at the cell and animal levels. Nuclear and Cytoplasmic RNA extraction kits and fluorescence in situ hybridization (FISH) were used to explore the distribution of circDNAJB6 in cells, and the potential mechanism of circDNAJB6 was verified by q-PCR, luciferase assays and rescue experiments.CircDNAJB6 is abundant in breast milk exosomes. Overexpression of circDNAJB6 can ameliorate damage in BPD models caused by hyperoxia exposure in vivo and in vitro. Mechanistically, circDNAJB6 can target the downstream DNAJB6 gene and promote the transcription of DNAJB6, exertive a protective effect on the experimental BPD model. Our results showed that circDNAJB6 alleviated damage and inhibited the proliferation of alveolar epithelial cells in the BPD model by promoting transcription of parent gene DNAJB6. Human milk exosome-derived circDNAJB6 provides new directions for preventing and treating BPD.
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Affiliation(s)
- Yubai Li
- Division of Neonatology, Department of Pediatrics, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University, First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, 518020, China
| | - Boshi Yu
- Division of Neonatology, Department of Pediatrics, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University, First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, 518020, China
| | - Huimin Li
- Department of Pediatrics, Nanjing Maternity and Child Health Care Hospital, Women's Hospital of Nanjing Medical University, Nanjing, 210004, China
| | - Weiwei Hou
- The Yangzhou School of Clinical Medicine of Nanjing Medical University, Yangzhou, 225000, China
| | - Jing Yin
- Department of Pediatrics, Nanjing Maternity and Child Health Care Hospital, Women's Hospital of Nanjing Medical University, Nanjing, 210004, China.
| | - Yahui Zhou
- Division of Neonatology, Department of Pediatrics, Wuxi Children's Hospital, Children's Hospital affiliated to Jiangnan University, Wuxi, 214000, China.
| | - Zhangbin Yu
- Division of Neonatology, Department of Pediatrics, Shenzhen People's Hospital, The Second Clinical Medical College of Jinan University, First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, 518020, China.
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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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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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5
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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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6
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Kaida A, Iwakuma T. Regulation of p53 and Cancer Signaling by Heat Shock Protein 40/J-Domain Protein Family Members. Int J Mol Sci 2021; 22:13527. [PMID: 34948322 PMCID: PMC8706882 DOI: 10.3390/ijms222413527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 12/27/2022] Open
Abstract
Heat shock proteins (HSPs) are molecular chaperones that assist diverse cellular activities including protein folding, intracellular transportation, assembly or disassembly of protein complexes, and stabilization or degradation of misfolded or aggregated proteins. HSP40, also known as J-domain proteins (JDPs), is the largest family with over fifty members and contains highly conserved J domains responsible for binding to HSP70 and stimulation of the ATPase activity as a co-chaperone. Tumor suppressor p53 (p53), the most frequently mutated gene in human cancers, is one of the proteins that functionally interact with HSP40/JDPs. The majority of p53 mutations are missense mutations, resulting in acquirement of unexpected oncogenic activities, referred to as gain of function (GOF), in addition to loss of the tumor suppressive function. Moreover, stability and levels of wild-type p53 (wtp53) and mutant p53 (mutp53) are crucial for their tumor suppressive and oncogenic activities, respectively. However, the regulatory mechanisms of wtp53 and mutp53 are not fully understood. Accumulating reports demonstrate regulation of wtp53 and mutp53 levels and/or activities by HSP40/JDPs. Here, we summarize updated knowledge related to the link of HSP40/JDPs with p53 and cancer signaling to improve our understanding of the regulation of tumor suppressive wtp53 and oncogenic mutp53 GOF activities.
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Affiliation(s)
- Atsushi Kaida
- Department of Oral Radiation Oncology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan;
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Tomoo Iwakuma
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
- Department of Pediatrics, Children’s Mercy Research Institute, Kansas City, MO 64108, USA
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7
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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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8
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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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9
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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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10
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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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11
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Milone M, Liewluck T. The unfolding spectrum of inherited distal myopathies. Muscle Nerve 2018; 59:283-294. [PMID: 30171629 DOI: 10.1002/mus.26332] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/26/2018] [Accepted: 08/28/2018] [Indexed: 12/30/2022]
Abstract
Distal myopathies are a group of rare muscle diseases characterized by distal weakness at onset. Although acquired myopathies can occasionally present with distal weakness, the majority of distal myopathies have a genetic etiology. Their age of onset varies from early-childhood to late-adulthood while the predominant muscle weakness can affect calf, ankle dorsiflexor, or distal upper limb muscles. A spectrum of muscle pathological changes, varying from nonspecific myopathic changes to rimmed vacuoles to myofibrillar pathology to nuclei centralization, have been noted. Likewise, the underlying molecular defect is heterogeneous. In addition, there is emerging evidence that distal myopathies can result from defective proteins encoded by genes causative of neurogenic disorders, be manifestation of multisystem proteinopathies or the result of the altered interplay between different genes. In this review, we provide an overview on the clinical, electrophysiological, pathological, and molecular aspects of distal myopathies, focusing on the most recent developments in the field. Muscle Nerve 59:283-294, 2019.
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Affiliation(s)
| | - Teerin Liewluck
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA
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12
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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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13
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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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14
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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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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: 88] [Impact Index Per Article: 14.7] [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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