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Asadauskaitė G, Vilimienė R, Augustinavičius V, Burnytė B. Case report of a family with hereditary inclusion body myopathy with VCP gene variant and literature review. Front Neurol 2023; 14:1290960. [PMID: 38146440 PMCID: PMC10749511 DOI: 10.3389/fneur.2023.1290960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 11/17/2023] [Indexed: 12/27/2023] Open
Abstract
Background Missense VCP gene variants lead to a disruption in protein homeostasis causing a spectrum of progressive degenerative diseases. Myopathy is the most frequent manifestation characterized by slowly progressing weakness of proximal and distal limb muscles. We present a family with myopathy due to c.277C > T variant in VCP gene. Case presentation The patient's phenotype includes symmetrical muscle wasting and weakness in the proximal parts of the limbs and axial muscles, a wide based gait, lordotic posture, positive Gowers' sign, mild calf enlargement, impaired mobility, elevated CK, and myopathy in proximal limb muscles. Whole body MRI revealed fatty replacement, predominantly affecting right vastus intermedius and medialis, gastrocnemius and soleus in calf, abdomen wall and lumbar muscles. Next-generation sequencing analysis revealed a pathogenic heterozygous variant c.277C > T (p.(Arg93Cys)) in exon 3 of the VCP gene. Segregation analysis showed that the detected variant is inherited from the affected father who developed symptoms at 60. Conclusion The patients described experienced muscle wasting and weakness in the proximal and distal parts of the limbs which is a common finding in VCP related disease. Nevertheless, the patient has distinguishing features, such as high CK levels, early onset of the disease, and rapid mobility decline.
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Affiliation(s)
| | - Ramunė Vilimienė
- Faculty of Medicine, Institute of Clinical Medicine, Vilnius University, Vilnius, Lithuania
| | - Vytautas Augustinavičius
- Center of Radiology and Nuclear Medicine, Vilnius University Hospital Santaros Klinikos, Vilnius, Lithuania
| | - Birutė Burnytė
- Faculty of Medicine, Institute of Biomedical Sciences, Vilnius University, Vilnius, Lithuania
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2
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Mukherjee S, Mahesh KV, Bhadada SK, Chatterjee D, Kumar R. The Role of Genetic Analysis in Demystifying the Diagnosis in a Middle-Aged Male Presenting With Proximal Muscle Weakness and Sclerotic-Lytic Skeletal Lesions. Cureus 2023; 15:e50924. [PMID: 38249245 PMCID: PMC10800001 DOI: 10.7759/cureus.50924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/20/2023] [Indexed: 01/23/2024] Open
Abstract
Paget's disease of bone (PDB) usually presents with bone pain and deformities. Herein, we describe a case of PDB who presented with gradually progressive quadriparesis. A man in his forties presented with gradually progressive proximal muscle weakness involving all four limbs. The patient had an elevated serum alkaline phosphatase level and osteosclerosis at various skeletal sites in a radiological skeletal survey. 18F-fluorodeoxyglucose (FDG) PET-CT showed FDG-avid sclerotic-lytic lesions at multiple skeletal sites. Histopathology evaluation of bone and muscle biopsy specimens revealed PDB and inclusion body myopathy (IBM) with neurogenic atrophy, respectively. A diagnosis of IBM associated with PDB without frontotemporal dementia (IBMPFD) was suspected and confirmed by exome sequencing, which revealed a heterozygous mutation in the VCP gene. The bone disease responded to zoledronate administration. A high index of suspicion for IBMPFD should be kept in mind in any patient with PDB presenting with proximal muscle weakness.
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Affiliation(s)
- Soham Mukherjee
- Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, IND
| | - Karthik V Mahesh
- Neurology, Postgraduate Institute of Medical Education and Research, Chandigarh, IND
| | - Sanjay K Bhadada
- Endocrinology, Postgraduate Institute of Medical Education and Research, Chandigarh, IND
| | - Debajyoti Chatterjee
- Pathology, Postgraduate Institute of Medical Education and Research, Chandigarh, IND
| | - Rajender Kumar
- Nuclear Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, IND
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3
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Abstract
Defects in macroautophagy/autophagy are implicated in the pathogenesis of neuromuscular and heart diseases. To precisely define the roles of autophagy-related genes in skeletal and cardiac muscles, we generated muscle-specific rb1cc1- and atg14-conditional knockout (cKO) mice by using Ckm/Ckmm2-Cre and compared their phenotypes to those of ulk1 ulk2-conditional double-knockout (cDKO) mice. atg14-cKO mice developed hypertrophic cardiomyopathy, which was associated with abnormal accumulation of autophagic cargoes in the heart and early mortality. Skeletal muscles of both atg14-cKO and rb1cc1-cKO mice showed features of autophagic vacuolar myopathy with ubiquitin+ SQSTM1+ deposits, but only those of rb1cc1-cKO mice showed TARDBP/TDP-43+ pathology and other features of the inclusion body myopathy-like disease we previously described in ulk1 ulk2-cDKO mice. Herein, we highlight tissue-specific differences between skeletal and cardiac muscles in their reliance on core autophagy proteins and unique roles for ULK1-ULK2 and RB1CC1 among these proteins in the development of TARDBP+ pathology.ABBREVIATIONS:AVM: autophagic vacuolar myopathy; cDKO: conditional double knockout; cKO: conditional knockout; H&E: hematoxylin and eosin; IBM: inclusion body myopathy; mtDNA: mitochondrial DNA; PFA: paraformaldehyde; RNP: ribonucleoprotein; TBST: Tris-buffered saline with 0.2% Triton X-100.
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Affiliation(s)
- Dongfang Li
- Departments of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Peter Vogel
- Departments of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Veterinary Pathology Core, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Xiujie Li-Harms
- Departments of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Bo Wang
- Departments of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA.,State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, Fujian Province, Fujian Province, China
| | - Mondira Kundu
- Departments of Pathology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN, USA
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4
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Korb MK, Kimonis VE, Mozaffar T. Multisystem proteinopathy: Where myopathy and motor neuron disease converge. Muscle Nerve 2020; 63:442-454. [PMID: 33145792 DOI: 10.1002/mus.27097] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 10/08/2020] [Accepted: 10/18/2020] [Indexed: 12/12/2022]
Abstract
Multisystem proteinopathy (MSP) is a pleiotropic group of inherited disorders that cause neurodegeneration, myopathy, and bone disease, and share common pathophysiology. Originally referred to as inclusion body myopathy associated with Paget disease of bone and frontotemporal dementia (IBMPFD), attributed to mutations in the gene encoding valosin-containing protein (VCP), it has more recently been discovered that there are several other genes responsible for similar clinical and pathological phenotypes with muscle, brain, nerve, and bone involvement, in various combinations. These include heterogeneous nuclear ribonucleoprotein A2B1 and A1 (hnRNPA2B1, hnRNPA1), sequestosome 1 (SQSTM1), matrin 3 (MATR3), T-cell restricted intracellular antigen 1 (TIA1), and optineurin (OPTN), all of which share disruption of RNA stress granule function and autophagic degradation. This review will discuss each of the genes implicated in MSP, exploring the molecular pathogenesis, clinical features, current standards of care, and future directions for this diverse yet mechanistically linked spectrum of disorders.
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Affiliation(s)
- Manisha K Korb
- Departments of Neurology, University of California Irvine, Orange, California, USA
| | - Virginia E Kimonis
- Departments of Pediatrics, University of California Irvine, Orange, California, USA
| | - Tahseen Mozaffar
- Departments of Neurology, University of California Irvine, Orange, California, USA.,Departments of Orthopedic Surgery, University of California Irvine, Orange, California, USA.,Departments of Pathology & Laboratory Medicine, University of California Irvine, Orange, California, USA
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5
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Wang B, Maxwell BA, Joo JH, Gwon Y, Messing J, Mishra A, Shaw TI, Ward AL, Quan H, Sakurada SM, Pruett-Miller SM, Bertorini T, Vogel P, Kim HJ, Peng J, Taylor JP, Kundu M. ULK1 and ULK2 Regulate Stress Granule Disassembly Through Phosphorylation and Activation of VCP/p97. Mol Cell 2019; 74:742-757.e8. [PMID: 30979586 DOI: 10.1016/j.molcel.2019.03.027] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 02/08/2019] [Accepted: 03/22/2019] [Indexed: 12/22/2022]
Abstract
Disturbances in autophagy and stress granule dynamics have been implicated as potential mechanisms underlying inclusion body myopathy (IBM) and related disorders. Yet the roles of core autophagy proteins in IBM and stress granule dynamics remain poorly characterized. Here, we demonstrate that disrupted expression of the core autophagy proteins ULK1 and ULK2 in mice causes a vacuolar myopathy with ubiquitin and TDP-43-positive inclusions; this myopathy is similar to that caused by VCP/p97 mutations, the most common cause of familial IBM. Mechanistically, we show that ULK1/2 localize to stress granules and phosphorylate VCP, thereby increasing VCP's activity and ability to disassemble stress granules. These data suggest that VCP dysregulation and defective stress granule disassembly contribute to IBM-like disease in Ulk1/2-deficient mice. In addition, stress granule disassembly is accelerated by an ULK1/2 agonist, suggesting ULK1/2 as targets for exploiting the higher-order regulation of stress granules for therapeutic intervention of IBM and related disorders.
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Affiliation(s)
- Bo Wang
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Brian A Maxwell
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Joung Hyuck Joo
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Youngdae Gwon
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - James Messing
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Ashutosh Mishra
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; St. Jude Proteomics Facility, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Timothy I Shaw
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; St. Jude Proteomics Facility, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Amber L Ward
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Honghu Quan
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Sadie Miki Sakurada
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Center for Advanced Genome Engineering, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Shondra M Pruett-Miller
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Center for Advanced Genome Engineering, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Tulio Bertorini
- Department of Neurology, University of Tennessee Heath Science Center, Memphis, TN 38163, USA
| | - Peter Vogel
- Veterinary Pathology Core, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Hong Joo Kim
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Junmin Peng
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - J Paul Taylor
- Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Mondira Kundu
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
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Ryan VH, Dignon GL, Zerze GH, Chabata CV, Silva R, Conicella AE, Amaya J, Burke KA, Mittal J, Fawzi NL. Mechanistic View of hnRNPA2 Low-Complexity Domain Structure, Interactions, and Phase Separation Altered by Mutation and Arginine Methylation. Mol Cell 2018; 69:465-479.e7. [PMID: 29358076 DOI: 10.1016/j.molcel.2017.12.022] [Citation(s) in RCA: 258] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 11/10/2017] [Accepted: 12/22/2017] [Indexed: 01/21/2023]
Abstract
hnRNPA2, a component of RNA-processing membraneless organelles, forms inclusions when mutated in a syndrome characterized by the degeneration of neurons (bearing features of amyotrophic lateral sclerosis [ALS] and frontotemporal dementia), muscle, and bone. Here we provide a unified structural view of hnRNPA2 self-assembly, aggregation, and interaction and the distinct effects of small chemical changes-disease mutations and arginine methylation-on these assemblies. The hnRNPA2 low-complexity (LC) domain is compact and intrinsically disordered as a monomer, retaining predominant disorder in a liquid-liquid phase-separated form. Disease mutations D290V and P298L induce aggregation by enhancing and extending, respectively, the aggregation-prone region. Co-aggregating in disease inclusions, hnRNPA2 LC directly interacts with and induces phase separation of TDP-43. Conversely, arginine methylation reduces hnRNPA2 phase separation, disrupting arginine-mediated contacts. These results highlight the mechanistic role of specific LC domain interactions and modifications conserved across many hnRNP family members but altered by aggregation-causing pathological mutations.
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Affiliation(s)
- Veronica H Ryan
- Neuroscience Graduate Program, Brown University, Providence, RI 02912, USA
| | - Gregory L Dignon
- Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA
| | - Gül H Zerze
- Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA
| | - Charlene V Chabata
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Rute Silva
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Alexander E Conicella
- Graduate Program in Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI 02912, USA
| | - Joshua Amaya
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Kathleen A Burke
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI 02912, USA
| | - Jeetain Mittal
- Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA
| | - Nicolas L Fawzi
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Brown University, Providence, RI 02912, USA.
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7
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VITTONATTO ELISA, BOSCHI SILVIA, CHIADò-PIAT LOREDANA, PONZALINO VALENTINA, BORTOLANI SARA, BRUSA CHIARA, RAINERO INNOCENZO, RICCI FEDERICA, VERCELLI LILIANA, MONGINI TIZIANA. Differential diagnosis of vacuolar muscle biopsies: use of p62, LC3 and LAMP2 immunohistochemistry. Acta Myol 2017; 36:191-198. [PMID: 29770361 PMCID: PMC5953231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Intrafibral vacuoles are the morphological hallmark in a wide variety of human skeletal muscle disorders with different etiology. In most cases, differential diagnosis is feasible with a routine histochemical work up of muscle biopsy. Ultrastructural analysis is an important confirmatory tool, but it is not widely available. Immunohistochemical stainings for p62, LAMP2 and LC3 are commonly available as tissutal marker for autophagy. We compared the immunohistochemical patterns for autophagic markers p62, LC3 and LAMP2 with routine histochemical markers in 39 biopsies from patients with definite diagnoses of glycogen storage disease type 2 (LOPD or Pompe disease, PD), sporadic inclusion body myositis (sIBM), oculo-pharyngeal muscular dystrophy (OPMD) and necrotizing myopathy (NM). Moreover, we also analyzed muscles of 10 normal controls. In PD group, LC3 and LAMP2 showed an higher percentage of positive fibers, whereas p62 was limited to a minority of fibers, thus paralleling the results of histochemical stainings; in NM group, LAMP2 and LC-3 were diffusely and unspecifically expressed in necrotic fibers, with p62 significantly expressed only in two cases. OPMD biopsies did not reveal any significant positivity. The most interesting results were observed in sIBM group, where p62 was expressed in all cases, even in fibers without other markers positivity. There results, although limited to a small number of cases, suggest that the contemporary use of p62, LAMP2 and LC-3 staining may have an adjunctive role in characterizing muscle fiber vacuoles, revealing autophagic pathway activation and providing further clues for the understanding of pathogenetic mechanisms.s.
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MESH Headings
- Adolescent
- Adult
- Aged
- Aged, 80 and over
- Autophagy
- Biomarkers/metabolism
- Biopsy
- Diagnosis, Differential
- Female
- Glycogen Storage Disease Type II/diagnosis
- Glycogen Storage Disease Type II/metabolism
- Glycogen Storage Disease Type II/pathology
- Humans
- Immunohistochemistry
- Infant
- Lysosomal-Associated Membrane Protein 2/metabolism
- Male
- Microtubule-Associated Proteins/metabolism
- Middle Aged
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Skeletal/pathology
- Muscular Diseases/diagnosis
- Muscular Diseases/metabolism
- Muscular Diseases/pathology
- Muscular Dystrophy, Oculopharyngeal/diagnosis
- Muscular Dystrophy, Oculopharyngeal/metabolism
- Muscular Dystrophy, Oculopharyngeal/pathology
- Myositis, Inclusion Body/diagnosis
- Myositis, Inclusion Body/metabolism
- Myositis, Inclusion Body/pathology
- Necrosis
- RNA-Binding Proteins/metabolism
- Retrospective Studies
- Vacuoles/metabolism
- Vacuoles/pathology
- Young Adult
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Affiliation(s)
- ELISA VITTONATTO
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - SILVIA BOSCHI
- Neurology 1, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), University of Florence, Italy
| | - LOREDANA CHIADò-PIAT
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - VALENTINA PONZALINO
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - SARA BORTOLANI
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - CHIARA BRUSA
- Child Neurology and Psychiatry Unit, Regina Margherita Children Hospital, Turin, Italy
| | - INNOCENZO RAINERO
- Neurology 1, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - FEDERICA RICCI
- Child Neurology and Psychiatry Unit, Regina Margherita Children Hospital, Turin, Italy
| | - LILIANA VERCELLI
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
| | - TIZIANA MONGINI
- Center for Neuromuscular Diseases “Paolo Peirolo”, Department of Neuroscience “Rita Levi Montalcini”, University of Turin, Italy
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Sabatelli M, Marangi G, Conte A, Tasca G, Zollino M, Lattante S. New ALS-Related Genes Expand the Spectrum Paradigm of Amyotrophic Lateral Sclerosis. Brain Pathol 2016; 26:266-75. [PMID: 26780671 DOI: 10.1111/bpa.12354] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/14/2016] [Indexed: 12/11/2022] Open
Abstract
Amyotrophic Lateral Sclerosis (ALS) is characterized by the degeneration of upper and lower motor neurons. Clinical heterogeneity is a well-recognized feature of the disease as age of onset, site of onset and the duration of the disease can vary greatly among patients. A number of genes have been identified and associated to familial and sporadic forms of ALS but the majority of cases remains still unexplained. Recent breakthrough discoveries have demonstrated that clinical manifestations associated with ALS-related genes are not circumscribed to motor neurons involvement. In this view, ALS appears to be linked to different conditions over a continuum or spectrum in which overlapping phenotypes may be identified. In this review, we aim to examine the increasing number of spectra, including ALS/Frontotemporal Dementia and ALS/Myopathies spectra. Considering all these neurodegenerative disorders as different phenotypes of the same spectrum can help to identify common pathological pathways and consequently new therapeutic targets in these incurable diseases.
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Affiliation(s)
- Mario Sabatelli
- Department of Geriatrics, Neurosciences and Orthopedics, Clinic Center NEMO-Roma. Institute of Neurology
| | - Giuseppe Marangi
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
| | - Amelia Conte
- Department of Geriatrics, Neurosciences and Orthopedics, Clinic Center NEMO-Roma. Institute of Neurology
| | | | - Marcella Zollino
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
| | - Serena Lattante
- Institute of Medical Genetics, Catholic University School of Medicine, Rome, Italy
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Kazamel M, Sorenson EJ, McEvoy KM, Jones LK, Leep-Hunderfund AN, Mauermann ML, Milone M. Clinical spectrum of valosin containing protein (VCP)-opathy. Muscle Nerve 2015; 54:94-9. [PMID: 26574898 DOI: 10.1002/mus.24980] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 10/21/2015] [Accepted: 11/16/2015] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Valosin containing protein (VCP) mutations cause a rare disorder characterized by hereditary inclusion body myopathy, Paget disease of bone (PDB), and frontotemporal dementia (FTD) with variable penetrance. VCP mutations have also been linked to amyotrophic lateral sclerosis and Charcot-Marie-Tooth disease type 2. METHODS Review of clinical, serological, electrophysiological, and myopathological findings of 6 VCP-opathy patients from 4 unrelated families. RESULTS Patients manifested muscle weakness between ages 40 and 53 years and developed predominant asymmetric limb girdle weakness. One patient had distal weakness at onset and co-existing peripheral neuropathy. Another patient had PDB, 1 had mild cognitive deficits, and 1 had FTD. All patients had myopathic and neurogenic electromyographic findings with predominant neurogenic changes in 2. Rimmed vacuoles were infrequent, while neurogenic changes were prominent in muscle biopsies. CONCLUSIONS VCP-opathy is a multifaceted disorder in which myopathy and peripheral neuropathy can coexist. The electrophysiological and pathological neurogenic changes raise the possibility of coexisting motor neuron involvement. Muscle Nerve, 2015 Muscle Nerve 54: 94-99, 2016 Muscle Nerve 54: 94-99, 2016.
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Affiliation(s)
- Mohamed Kazamel
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, 55905, USA
| | - Eric J Sorenson
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, 55905, USA
| | - Kathleen M McEvoy
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, 55905, USA
| | - Lyell K Jones
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, 55905, USA
| | | | | | - Margherita Milone
- Department of Neurology, Mayo Clinic, Rochester, Minnesota, 55905, USA
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10
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Vesa J, Su H, Watts GD, Krause S, Walter MC, Wallace DC, Kimonis VE. Valosin containing protein associated inclusion body myopathy: abnormal vacuolization, autophagy and cell fusion in myoblasts. Neuromuscul Disord 2009; 19:766-72. [PMID: 19828315 PMCID: PMC2782446 DOI: 10.1016/j.nmd.2009.08.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2009] [Revised: 08/05/2009] [Accepted: 08/07/2009] [Indexed: 11/26/2022]
Abstract
Inclusion body myopathy associated with Paget's disease and frontotemporal dementia (IBMPFD) is caused by mutations in the valosin containing protein (VCP) gene. The disease is associated with progressive proximal muscle weakness, inclusions and vacuoles in muscle fibers, malfunction in the bone remodeling process resulting in Paget's disease, and premature frontotemporal dementia. VCP is involved in several cellular processes related to the endoplasmic reticulum associated degradation of proteins. To understand the pathological mechanisms underlying the myopathy in IBMPFD, we have studied the cellular consequences of VCP mutations in human primary myoblasts. Our results revealed that patients' myoblasts accumulate large vacuoles. Lysosomal membrane proteins Lamp1 and Lamp2 show increased molecular weights in patients' myoblasts due to differential N-glycosylation. Additionally, mutant myoblasts show increased autophagy when cultured in the absence of nutrients, as well as defective cell fusion and increased apoptosis. Our results elucidate that VCP mutations result in disturbances in several cellular processes, which will help us in the understanding of the pathological mechanisms resulting in muscle weakness and other features of VCP associated disease.
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Affiliation(s)
- Jouni Vesa
- Department of Pediatrics, Division of Genetics and Metabolism, University of California, Irvine, CA, USA
| | - Hailing Su
- Department of Pediatrics, Division of Genetics and Metabolism, University of California, Irvine, CA, USA
| | - Giles D. Watts
- Department of Orthopaedic Surgery, Children's Hospital Boston, Harvard Medical School, Boston, MA, USA
| | - Sabine Krause
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximillians-University, Munich, Germany
| | - Maggie C. Walter
- Department of Neurology, Friedrich-Baur-Institute, Ludwig-Maximillians-University, Munich, Germany
| | - Douglas C. Wallace
- Center for Molecular and Mitochondrial Medicine and Genetics, University of California, Irvine, CA, USA
- Department of Biological Chemistry, University of California, Irvine, CA, USA
- Departments of Ecology and Evolutionary Biology and Pediatrics, University of California, Irvine, CA, USA
| | - Virginia E. Kimonis
- Department of Pediatrics, Division of Genetics and Metabolism, University of California, Irvine, CA, USA
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