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Webster CP, Smith EF, Shaw PJ, De Vos KJ. Protein Homeostasis in Amyotrophic Lateral Sclerosis: Therapeutic Opportunities? Front Mol Neurosci 2017; 10:123. [PMID: 28512398 PMCID: PMC5411428 DOI: 10.3389/fnmol.2017.00123] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 04/11/2017] [Indexed: 12/11/2022] Open
Abstract
Protein homeostasis (proteostasis), the correct balance between production and degradation of proteins, is essential for the health and survival of cells. Proteostasis requires an intricate network of protein quality control pathways (the proteostasis network) that work to prevent protein aggregation and maintain proteome health throughout the lifespan of the cell. Collapse of proteostasis has been implicated in the etiology of a number of neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS), the most common adult onset motor neuron disorder. Here, we review the evidence linking dysfunctional proteostasis to the etiology of ALS and discuss how ALS-associated insults affect the proteostasis network. Finally, we discuss the potential therapeutic benefit of proteostasis network modulation in ALS.
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Affiliation(s)
- Christopher P Webster
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of SheffieldSheffield, UK
| | - Emma F Smith
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of SheffieldSheffield, UK
| | - Pamela J Shaw
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of SheffieldSheffield, UK
| | - Kurt J De Vos
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of SheffieldSheffield, UK
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52
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Couratier P, Corcia P, Lautrette G, Nicol M, Marin B. ALS and frontotemporal dementia belong to a common disease spectrum. Rev Neurol (Paris) 2017; 173:273-279. [DOI: 10.1016/j.neurol.2017.04.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 04/05/2017] [Indexed: 12/13/2022]
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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] [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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54
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Tang WK, Xia D. Mutations in the Human AAA + Chaperone p97 and Related Diseases. Front Mol Biosci 2016; 3:79. [PMID: 27990419 PMCID: PMC5131264 DOI: 10.3389/fmolb.2016.00079] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 11/18/2016] [Indexed: 12/12/2022] Open
Abstract
A number of neurodegenerative diseases have been linked to mutations in the human protein p97, an abundant cytosolic AAA+ (ATPase associated with various cellular activities) ATPase, that functions in a large number of cellular pathways. With the assistance of a variety of cofactors and adaptor proteins, p97 couples the energy of ATP hydrolysis to conformational changes that are necessary for its function. Disease-linked mutations, which are found at the interface between two main domains of p97, have been shown to alter the function of the protein, although the pathogenic mutations do not appear to alter the structure of individual subunit of p97 or the formation of the hexameric biological unit. While exactly how pathogenic mutations alter the cellular function of p97 remains unknown, functional, biochemical and structural differences between wild-type and pathogenic mutants of p97 are being identified. Here, we summarize recent progress in the study of p97 pathogenic mutants.
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Affiliation(s)
- Wai Kwan Tang
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health Bethesda, MD, USA
| | - Di Xia
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health Bethesda, MD, USA
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55
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Gang Q, Bettencourt C, Machado PM, Brady S, Holton JL, Pittman AM, Hughes D, Healy E, Parton M, Hilton-Jones D, Shieh PB, Needham M, Liang C, Zanoteli E, de Camargo LV, De Paepe B, De Bleecker J, Shaibani A, Ripolone M, Violano R, Moggio M, Barohn RJ, Dimachkie MM, Mora M, Mantegazza R, Zanotti S, Singleton AB, Hanna MG, Houlden H. Rare variants in SQSTM1 and VCP genes and risk of sporadic inclusion body myositis. Neurobiol Aging 2016; 47:218.e1-218.e9. [PMID: 27594680 PMCID: PMC5082791 DOI: 10.1016/j.neurobiolaging.2016.07.024] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 06/27/2016] [Accepted: 07/29/2016] [Indexed: 12/14/2022]
Abstract
Genetic factors have been suggested to be involved in the pathogenesis of sporadic inclusion body myositis (sIBM). Sequestosome 1 (SQSTM1) and valosin-containing protein (VCP) are 2 key genes associated with several neurodegenerative disorders but have yet to be thoroughly investigated in sIBM. A candidate gene analysis was conducted using whole-exome sequencing data from 181 sIBM patients, and whole-transcriptome expression analysis was performed in patients with genetic variants of interest. We identified 6 rare missense variants in the SQSTM1 and VCP in 7 sIBM patients (4.0%). Two variants, the SQSTM1 p.G194R and the VCP p.R159C, were significantly overrepresented in this sIBM cohort compared with controls. Five of these variants had been previously reported in patients with degenerative diseases. The messenger RNA levels of major histocompatibility complex genes were upregulated, this elevation being more pronounced in SQSTM1 patient group. We report for the first time potentially pathogenic SQSTM1 variants and expand the spectrum of VCP variants in sIBM. These data suggest that defects in neurodegenerative pathways may confer genetic susceptibility to sIBM and reinforce the mechanistic overlap in these neurodegenerative disorders.
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Affiliation(s)
- Qiang Gang
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK
| | - Conceição Bettencourt
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, Queen Square, London, UK
| | - Pedro M Machado
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK; Centre for Rheumatology, Division of Medicine, University College London, London, UK
| | - Stefen Brady
- MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK; Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - Janice L Holton
- MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK
| | - Alan M Pittman
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; Reta Lila Weston Laboratories, UCL Institute of Neurology, London, UK
| | - Deborah Hughes
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK
| | - Estelle Healy
- MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK
| | - Matthew Parton
- MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK
| | - David Hilton-Jones
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - Perry B Shieh
- Department of Neurology, University of California, Los Angeles, Los Angeles, CA, USA
| | - Merrilee Needham
- Western Australian Neurosciences Research Institute (WANRI), University of Western Australia and Murdoch University, Fiona Stanley Hospital, Perth, Australia
| | - Christina Liang
- Department of Neurology, Royal North Shore Hospital, New South Wales, Australia
| | - Edmar Zanoteli
- Department of Neurology, Medical School of the University of São Paulo (FMUSP), São Paulo, Brazil
| | | | - Boel De Paepe
- Department of Neurology and Neuromuscular Reference Centre, Ghent University Hospital, Ghent, Belgium
| | - Jan De Bleecker
- Department of Neurology and Neuromuscular Reference Centre, Ghent University Hospital, Ghent, Belgium
| | | | - Michela Ripolone
- Neuromuscular Unit, IRCCS Foundation Ca' Granda Ospedale Maggiore Policlinico, Dino Ferrari Centre, University of Milan, Milan, Italy
| | - Raffaella Violano
- Neuromuscular Unit, IRCCS Foundation Ca' Granda Ospedale Maggiore Policlinico, Dino Ferrari Centre, University of Milan, Milan, Italy
| | - Maurizio Moggio
- Neuromuscular Unit, IRCCS Foundation Ca' Granda Ospedale Maggiore Policlinico, Dino Ferrari Centre, University of Milan, Milan, Italy
| | | | | | - Marina Mora
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Isitituto Neurologico C. Besta, Milano, Italy
| | - Renato Mantegazza
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Isitituto Neurologico C. Besta, Milano, Italy
| | - Simona Zanotti
- Neuromuscular Diseases and Neuroimmunology Unit, Fondazione IRCCS Isitituto Neurologico C. Besta, Milano, Italy
| | - Andrew B Singleton
- Laboratory of Neurogenetics, National Institute on Aging, National Institute of Health, Bethesda, MD, USA
| | - Michael G Hanna
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK.
| | - Henry Houlden
- Department of Molecular Neuroscience, Institute of Neurology, University College London, Queen Square, London, UK; MRC Centre for Neuromuscular Diseases, Institute of Neurology, University College London, Queen Square, London, UK; Neurogenetics Laboratory, Institute of Neurology, University College London, Queen Square, London, UK.
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Screening of SOD1, FUS and TARDBP genes in patients with amyotrophic lateral sclerosis in central-southern China. Sci Rep 2016; 6:32478. [PMID: 27604643 PMCID: PMC5015023 DOI: 10.1038/srep32478] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/08/2016] [Indexed: 01/26/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease affecting motor neurons of the brain, brainstem and spinal cord. To date, mutations in more than 30 genes have been linked to the pathogenesis of ALS. Among them, SOD1, FUS and TARDBP are ranked as the three most common genes associated with ALS. However, no mutation analysis has been reported in central-southern China. In this study, we sequenced SOD1, FUS and TARDBP in a central-southern Chinese cohort of 173 patients with ALS (15 familial ALS and 158 sporadic ALS) to detect mutations. As a result, five missense mutations in SOD1, namely, p.D101N, p.D101G, p.C111Y, p.N86S and p.V87A, were identified in three unrelated familial probands and three sporadic cases; two mutations in FUS were found in two unrelated familial probands, including an insertion mutation (p.P525_Y526insY) and a missense mutation (p.R521H); no variants of TARDBP were observed in patients. Therefore, SOD1 mutations were present in 20.0% of familial ALS patients and 1.9% of sporadic ALS patients, while FUS mutations were responsible for 13.3% of familial ALS cases, and TARDBP mutations were rare in either familial or sporadic ALS cases. This study broadens the known mutational spectrum in patients with ALS and further demonstrates the necessity for genetic screening in ALS patients from central-southern China.
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57
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Genetic testing and genetic counseling for amyotrophic lateral sclerosis: an update for clinicians. Genet Med 2016; 19:267-274. [DOI: 10.1038/gim.2016.107] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/17/2016] [Indexed: 12/11/2022] Open
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Abstract
Progressive muscular atrophy (PMA) is a rare, sporadic, adult-onset motor neuron disease, clinically characterized by isolated lower motor neuron features; however, clinically evident upper motor neuron signs may emerge in some patients. Subclinical upper motor neuron involvement is identified pathologically, radiologically, and neurophysiologically in a substantial number of patients with PMA. Patients with subclinical upper motor neuron involvement do not fulfill the revised El Escorial criteria to participate in amyotrophic lateral sclerosis clinical trials. Intravenous immunoglobulin therapy is only marginally beneficial in a small subgroup of patients with lower motor neuron syndrome without conduction block.
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Affiliation(s)
- Teerin Liewluck
- Department of Neurology, University of Colorado School of Medicine, Anschutz Medical Campus, 12631 East 17th Avenue, Mail Stop B-185, Aurora, CO 80045, USA; Department of Neurology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
| | - David S Saperstein
- Phoenix Neurological Associates, University of Arizona College of Medicine, 5090 North 40th Street, Suite 250, Phoenix, AZ 85018, USA
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59
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One family, one gene and three phenotypes: A novel VCP (valosin-containing protein) mutation associated with myopathy with rimmed vacuoles, amyotrophic lateral sclerosis and frontotemporal dementia. J Neurol Sci 2016; 368:352-8. [PMID: 27538664 DOI: 10.1016/j.jns.2016.07.048] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/16/2016] [Accepted: 07/20/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND VCP (valosin-containing protein gene) variants have been associated with peripheral and central neurodegenerative processes, including inclusion body myopathy (IBM), Paget disease of bone (PDB), frontotemporal dementia (FTD), and familial amyotrophic lateral sclerosis (ALS) type 14. The combination of IBM, PDB (IBMPFD1) can presented in one individual. However, the association of IBMPFD1 and ALS in the same family is rare. METHODS We reported three individuals from a Brazilian kindred with intrafamilial phenotype variability. Whole exome sequencing (WES) of the proband was performed and revealed a novel VCP variant. VCP Sanger sequencing was performed in the proband and his family members to confirm WES finding and segregation. We performed a systematic review of the literature regarding the genotypic-phenotypic VCP correlations. RESULTS Each individual presented with either myopathy with rimmed vacuoles, ALS, or FTD. There was no PDB. WES of the proband identified the heterozygous variant c.271A>T (p.Asn91Tyr) in the exon 3 of VCP. Sanger sequencing confirmed the segregation of this variant in an autosomal-dominant pattern. CONCLUSION This study expands the genotypic spectrum of the missense mutations of the VCP gene with a novel p.Asn91Tyr variant found in a Brazilian family presenting with the unusual intrafamiliar association of myopathy with rimmed vacuoles, ALS and FTD.
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60
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De Marco G, Lomartire A, Calvo A, Risso A, De Luca E, Mostert M, Mandrioli J, Caponnetto C, Borghero G, Manera U, Canosa A, Moglia C, Restagno G, Fini N, Tarella C, Giordana MT, Rinaudo MT, Chiò A. Monocytes of patients with amyotrophic lateral sclerosis linked to gene mutations display altered TDP-43 subcellular distribution. Neuropathol Appl Neurobiol 2016; 43:133-153. [PMID: 27178390 DOI: 10.1111/nan.12328] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 04/20/2016] [Accepted: 05/14/2016] [Indexed: 12/12/2022]
Abstract
AIMS Cytoplasmic accumulation of the nuclear protein transactive response DNA-binding protein 43 (TDP-43) is an early determinant of motor neuron degeneration in most amyotrophic lateral sclerosis (ALS) cases. We previously disclosed this accumulation in circulating lymphomonocytes (CLM) of ALS patients with mutant TARDBP, the TDP-43-coding gene, as well as of a healthy individual carrying the parental TARDBP mutation. Here, we investigate TDP-43 subcellular localization in CLM and in the constituent cells, lymphocytes and monocytes, of patients with various ALS-linked mutant genes. METHODS TDP-43 subcellular localization was analysed with western immunoblotting and immunocytofluorescence in CLM of healthy controls (n = 10), patients with mutant TARDBP (n = 4, 1 homozygous), valosin-containing protein (VCP; n = 2), fused in sarcoma/translocated in liposarcoma (FUS; n = 2), Cu/Zn superoxide dismutase 1 (SOD1; n = 6), chromosome 9 open reading frame 72 (C9ORF72; n = 4), without mutations (n = 5) and neurologically unaffected subjects with mutant TARDBP (n = 2). RESULTS TDP-43 cytoplasmic accumulation was found (P < 0.05 vs. controls) in CLM of patients with mutant TARDBP or VCP, but not FUS, in line with TDP-43 subcellular localization described for motor neurons of corresponding groups. Accumulation also characterized CLM of the healthy individuals with mutant TARDBP and of some patients with mutant SOD1 or C9ORF72. In 5 patients, belonging to categories described to carry TDP-43 mislocalization in motor neurons (3 C9ORF72, 1 TARDBP and 1 without mutations), TDP-43 cytoplasmic accumulation was not detected in CLM or in lymphocytes but was in monocytes. CONCLUSIONS In ALS forms characterized by TDP-43 mislocalization in motor neurons, monocytes display this alteration, even when not manifest in CLM. Monocytes may be used to support diagnosis, as well as to identify subjects at risk, of ALS and to develop/monitor targeted treatments.
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Affiliation(s)
- G De Marco
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy
| | - A Lomartire
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy
| | - A Calvo
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy.,ALS Center, University of Turin and AOU Città della Salute e della Scienza, Turin, Italy
| | - A Risso
- Molecular Biotechnology Center, University of Turin, Turin, Italy
| | - E De Luca
- Molecular Biotechnology Center, University of Turin, Turin, Italy
| | - M Mostert
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - J Mandrioli
- Department of Neuroscience, Sant'Agostino Estense Hospital, University of Modena, Modena, Italy
| | - C Caponnetto
- Department of Neurosciences, Ophthalmology, Genetics, Rehabilitation and Child Health, IRCCS AOU San Martino IST, University of Genoa, Genoa, Italy
| | - G Borghero
- Department of Neurology, AOU and University of Cagliari, Cagliari, Italy
| | - U Manera
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy.,ALS Center, University of Turin and AOU Città della Salute e della Scienza, Turin, Italy
| | - A Canosa
- ALS Center, University of Turin and AOU Città della Salute e della Scienza, Turin, Italy.,Department of Neurosciences, Ophthalmology, Genetics, Rehabilitation and Child Health, IRCCS AOU San Martino IST, University of Genoa, Genoa, Italy
| | - C Moglia
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy.,ALS Center, University of Turin and AOU Città della Salute e della Scienza, Turin, Italy
| | - G Restagno
- Molecular Genetics Unit, Department of Clinical Pathology, AOU Città della Salute e della Scienza, University of Turin, Turin, Italy
| | - N Fini
- Department of Neuroscience, Sant'Agostino Estense Hospital, University of Modena, Modena, Italy
| | - C Tarella
- Clinical Hemato-Oncology, European Institute of Oncology (IEO), Milan, Italy
| | - M T Giordana
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy
| | - M T Rinaudo
- Department of Oncology, University of Turin, Turin, Italy
| | - A Chiò
- 'Rita Levi Montalcini' Department of Neuroscience, University of Turin, Turin, Italy.,ALS Center, University of Turin and AOU Città della Salute e della Scienza, Turin, Italy
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Evangelista T, Weihl CC, Kimonis V, Lochmüller H. 215th ENMC International Workshop VCP-related multi-system proteinopathy (IBMPFD) 13-15 November 2015, Heemskerk, The Netherlands. Neuromuscul Disord 2016; 26:535-47. [PMID: 27312024 DOI: 10.1016/j.nmd.2016.05.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 05/26/2016] [Indexed: 12/12/2022]
Affiliation(s)
- Teresinha Evangelista
- John Walton Muscular Dystrophy Research Centre and MRC Centre for Neuromuscular Diseases, Institute of Genetic Medicine, Newcastle University, UK
| | - Conrad C Weihl
- Neuromuscular Division, Washington University School of Medicine, Saint Louis, MO, USA
| | - Virginia Kimonis
- Division of Genetics and Genomic Medicine, University of California - Irvine Medical Centre, Irvine, USA
| | - Hanns Lochmüller
- John Walton Muscular Dystrophy Research Centre and MRC Centre for Neuromuscular Diseases, Institute of Genetic Medicine, Newcastle University, UK.
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Alsultan AA, Waller R, Heath PR, Kirby J. The genetics of amyotrophic lateral sclerosis: current insights. Degener Neurol Neuromuscul Dis 2016; 6:49-64. [PMID: 30050368 PMCID: PMC6053097 DOI: 10.2147/dnnd.s84956] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder that results in loss of the upper and lower motor neurons from motor cortex, brainstem, and spinal cord. While the majority of cases are sporadic, approximately 10% show familial inheritance. ALS is usually inherited in an autosomal dominant manner, although autosomal recessive and X-linked inheritance do occur. To date, 24 of the genes at 26 loci have been identified; these include loci linked to ALS and to frontotemporal dementia-ALS, where family pedigrees contain individuals with frontotemporal dementia with/without ALS. The most commonly established genetic causes of familial ALS (FALS) to date are the presence of a hexanucleotide repeat expansion in the C9ORF72 gene (39.3% FALS) and mutation of SOD1, TARDBP, and FUS, with frequencies of 12%-23.5%, 5%, and 4.1%, respectively. However, with the increasing use of next-generation sequencing of small family pedigrees, this has led to an increasing number of genes being associated with ALS. This review provides a comprehensive review on the genetics of ALS and an update of the pathogenic mechanisms associated with these genes. Commonly implicated pathways have been established, including RNA processing, the protein degradation pathways of autophagy and ubiquitin-proteasome system, as well as protein trafficking and cytoskeletal function. Elucidating the role genetics plays in both FALS and sporadic ALS is essential for understanding the subsequent cellular dysregulation that leads to motor neuron loss, in order to develop future effective therapeutic strategies.
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Affiliation(s)
- Afnan A Alsultan
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of Sheffield, Sheffield, UK,
| | - Rachel Waller
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of Sheffield, Sheffield, UK,
| | - Paul R Heath
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of Sheffield, Sheffield, UK,
| | - Janine Kirby
- Sheffield Institute for Translational Neuroscience (SITraN), Department of Neuroscience, University of Sheffield, Sheffield, UK,
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63
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Protein aggregation and ER stress. Brain Res 2016; 1648:658-666. [PMID: 27037184 DOI: 10.1016/j.brainres.2016.03.044] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 03/26/2016] [Accepted: 03/28/2016] [Indexed: 12/12/2022]
Abstract
Protein aggregation is a common feature of the protein misfolding or conformational diseases, among them most of the neurodegenerative diseases. These disorders are a major scourge, with scarce if any effective therapies at present. Recent research has identified ER stress as a major mechanism implicated in cytotoxicity in these diseases. Whether amyloid-β or tau in Alzheimer's, α-synuclein in Parkinson's, huntingtin in Huntington's disease or other aggregation-prone proteins in many other neurodegenerative diseases, there is a shared pathway of oligomerization and aggregation into amyloid fibrils. There is increasing evidence in recent years that the toxic species, and those that evoke ER stress, are the intermediate oligomeric forms and not the final amyloid aggregates. This review focuses on recent findings on the mechanisms and importance of the development of ER stress upon protein aggregation, especially in neurodegenerative diseases, and possible therapeutic approaches that are being examined. This article is part of a Special Issue entitled SI:ER stress.
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64
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Edens BM, Miller N, Ma YC. Impaired Autophagy and Defective Mitochondrial Function: Converging Paths on the Road to Motor Neuron Degeneration. Front Cell Neurosci 2016; 10:44. [PMID: 26973461 PMCID: PMC4776126 DOI: 10.3389/fncel.2016.00044] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 02/08/2016] [Indexed: 12/12/2022] Open
Abstract
Selective motor neuron degeneration is a hallmark of amyotrophic lateral sclerosis (ALS). Around 10% of all cases present as familial ALS (FALS), while sporadic ALS (SALS) accounts for the remaining 90%. Diverse genetic mutations leading to FALS have been identified, but the underlying causes of SALS remain largely unknown. Despite the heterogeneous and incompletely understood etiology, different types of ALS exhibit overlapping pathology and common phenotypes, including protein aggregation and mitochondrial deficiencies. Here, we review the current understanding of mechanisms leading to motor neuron degeneration in ALS as they pertain to disrupted cellular clearance pathways, ATP biogenesis, calcium buffering and mitochondrial dynamics. Through focusing on impaired autophagic and mitochondrial functions, we highlight how the convergence of diverse cellular processes and pathways contributes to common pathology in motor neuron degeneration.
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Affiliation(s)
- Brittany M. Edens
- Departments of Pediatrics, Neurology, and Physiology, Northwestern University Feinberg School of MedicineChicago, IL, USA
- Lurie Children’s Hospital of ChicagoChicago, IL, USA
| | - Nimrod Miller
- Departments of Pediatrics, Neurology, and Physiology, Northwestern University Feinberg School of MedicineChicago, IL, USA
- Lurie Children’s Hospital of ChicagoChicago, IL, USA
| | - Yong-Chao Ma
- Departments of Pediatrics, Neurology, and Physiology, Northwestern University Feinberg School of MedicineChicago, IL, USA
- Lurie Children’s Hospital of ChicagoChicago, IL, USA
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Segawa M, Hoshi A, Naruse H, Kuroda M, Bujo H, Ugawa Y. [A patient with familial amyotrophic lateral sclerosis associated with a new valosin-containing protein (VCP) gene mutation]. Rinsho Shinkeigaku 2015; 55:914-920. [PMID: 26511028 DOI: 10.5692/clinicalneurol.cn-000765] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this communication, we report a patient with familial amyotrophic lateral sclerosis (ALS) associated with a familial dyslipidemia. Genetic analysis revealed a novel heterozygous valosin-containing protein (VCP) mutation (c.466G>T (p.G156C)). The other gene analysis also disclosed a known homozygous LCAT mutation (c.101C>T (p.P10L)). VCP gene mutation shown should be responsible for familial ALS because of following reasons. The patient's father also was also affected by ALS. The VCP gene mutation (p.G156C) in the patient was located in the vicinity of a site frequently associated with pathogenic VCP variants. The same amino acid transformation as that of this patient has been reported to be involved in the pathogenesis of inclusion body myopathy with Paget's disease of the bone and frontotemporal dementia. This is the first case report of rare association of ALS with VCP mutation and dyslipidemia with LCAT mutation.
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Affiliation(s)
- Mari Segawa
- Department of Neurology, School of Medicine, Fukushima Medical University
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Ghosh S, Geahlen RL. Stress Granules Modulate SYK to Cause Microglial Cell Dysfunction in Alzheimer's Disease. EBioMedicine 2015; 2:1785-98. [PMID: 26870803 PMCID: PMC4740304 DOI: 10.1016/j.ebiom.2015.09.053] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 09/21/2015] [Accepted: 09/30/2015] [Indexed: 12/13/2022] Open
Abstract
Microglial cells in the brains of Alzheimer's patients are known to be recruited to amyloid-beta (Aβ) plaques where they exhibit an activated phenotype, but are defective for plaque removal by phagocytosis. In this study, we show that microglia stressed by exposure to sodium arsenite or Aβ(1–42) peptides or fibrils form extensive stress granules (SGs) to which the tyrosine kinase, SYK, is recruited. SYK enhances the formation of SGs, is active within the resulting SGs and stimulates the production of reactive oxygen and nitrogen species that are toxic to neuronal cells. This sequestration of SYK inhibits the ability of microglial cells to phagocytose Escherichia coli or Aβ fibrils. We find that aged microglial cells are more susceptible to the formation of SGs; and SGs containing SYK and phosphotyrosine are prevalent in the brains of patients with severe Alzheimer's disease. Phagocytic activity can be restored to stressed microglial cells by treatment with IgG, suggesting a mechanism to explain the therapeutic efficacy of intravenous IgG. These studies describe a mechanism by which stress, including exposure to Aβ, compromises the function of microglial cells in Alzheimer's disease and suggest approaches to restore activity to dysfunctional microglial cells. Chronic stress promotes the formation of large, persistent stress granules in microglial cells. SYK is recruited to stress granules, which promotes inflammatory responses and inhibits phagocytosis. Phagocytic activity of stressed cells can be recovered by treatment with IgG.
Microglial cells in the brains of patients with Alzheimer's disease are activated, but are defective at phagocytosis of amyloid plaques. Activation and phagocytosis require the SYK tyrosine kinase. Chronic exposure to amyloid-beta promotes the formation of persistent stress granules to which active SYK binds and these are found in the brains of patients with severe Alzheimer's disease. This activation and sequestration of SYK promotes inflammation and inhibits phagocytosis. Phagocytic activity can be recovered by treatment with IgG, which causes a redistribution of SYK within the cell, suggesting potential therapeutic approaches to restoring microglial cell function to diseased or aged brains.
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Affiliation(s)
- Soumitra Ghosh
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA
| | - Robert L Geahlen
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA
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Marangi G, Traynor BJ. Genetic causes of amyotrophic lateral sclerosis: new genetic analysis methodologies entailing new opportunities and challenges. Brain Res 2015; 1607:75-93. [PMID: 25316630 PMCID: PMC5916786 DOI: 10.1016/j.brainres.2014.10.009] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 10/03/2014] [Accepted: 10/05/2014] [Indexed: 12/11/2022]
Abstract
The genetic architecture of amyotrophic lateral sclerosis (ALS) is being increasingly understood. In this far-reaching review, we examine what is currently known about ALS genetics and how these genes were initially identified. We also discuss the various types of mutations that might underlie this fatal neurodegenerative condition and outline some of the strategies that might be useful in untangling them. These include expansions of short repeat sequences, common and low-frequency genetic variations, de novo mutations, epigenetic changes, somatic mutations, epistasis, oligogenic and polygenic hypotheses. This article is part of a Special Issue entitled ALS complex pathogenesis.
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Affiliation(s)
- Giuseppe Marangi
- Neuromuscular Diseases Research Section, Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD, USA; Institute of Medical Genetics, Catholic University, Roma, Italy.
| | - Bryan J Traynor
- Neuromuscular Diseases Research Section, Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD, USA; Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Defining the genetic connection linking amyotrophic lateral sclerosis (ALS) with frontotemporal dementia (FTD). Trends Genet 2015; 31:263-73. [DOI: 10.1016/j.tig.2015.03.005] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 03/10/2015] [Accepted: 03/10/2015] [Indexed: 12/11/2022]
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Zhang X, Gui L, Zhang X, Bulfer SL, Sanghez V, Wong DE, Lee Y, Lehmann L, Lee JS, Shih PY, Lin HJ, Iacovino M, Weihl CC, Arkin MR, Wang Y, Chou TF. Altered cofactor regulation with disease-associated p97/VCP mutations. Proc Natl Acad Sci U S A 2015; 112:E1705-14. [PMID: 25775548 PMCID: PMC4394316 DOI: 10.1073/pnas.1418820112] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Dominant mutations in p97/VCP (valosin-containing protein) cause a rare multisystem degenerative disease with varied phenotypes that include inclusion body myopathy, Paget's disease of bone, frontotemporal dementia, and amyotrophic lateral sclerosis. p97 disease mutants have altered N-domain conformations, elevated ATPase activity, and altered cofactor association. We have now discovered a previously unidentified disease-relevant functional property of p97 by identifying how the cofactors p37 and p47 regulate p97 ATPase activity. We define p37 as, to our knowledge, the first known p97-activating cofactor, which enhances the catalytic efficiency (kcat/Km) of p97 by 11-fold. Whereas both p37 and p47 decrease the Km of ATP in p97, p37 increases the kcat of p97. In contrast, regulation by p47 is biphasic, with decreased kcat at low levels but increased kcat at higher levels. By deleting a region of p47 that lacks homology to p37 (amino acids 69-92), we changed p47 from an inhibitory cofactor to an activating cofactor, similar to p37. Our data suggest that cofactors regulate p97 ATPase activity by binding to the N domain. Induced conformation changes affect ADP/ATP binding at the D1 domain, which in turn controls ATPase cycling. Most importantly, we found that the D2 domain of disease mutants failed to be activated by p37 or p47. Our results show that cofactors play a critical role in controlling p97 ATPase activity, and suggest that lack of cofactor-regulated communication may contribute to p97-associated disease pathogenesis.
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Affiliation(s)
- Xiaoyi Zhang
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502; College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, People's Republic of China
| | - Lin Gui
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502; College of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, People's Republic of China
| | - Xiaoyan Zhang
- Department of Molecular, Cellular and Developmental Biology, The University of Michigan, Ann Arbor, MI 48109-1048
| | - Stacie L Bulfer
- Small Molecule Discovery Center, Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158
| | - Valentina Sanghez
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502
| | - Daniel E Wong
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502
| | - YouJin Lee
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110
| | - Lynn Lehmann
- NanoTemper Technologies, Inc., South San Francisco, CA 94080
| | - James Siho Lee
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Pei-Yin Shih
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Henry J Lin
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502
| | - Michelina Iacovino
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502
| | - Conrad C Weihl
- Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110
| | - Michelle R Arkin
- Small Molecule Discovery Center, Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158
| | - Yanzhuang Wang
- Department of Molecular, Cellular and Developmental Biology, The University of Michigan, Ann Arbor, MI 48109-1048
| | - Tsui-Fen Chou
- Division of Medical Genetics, Department of Pediatrics, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute, Torrance, CA 90502;
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Ng ASL, Rademakers R, Miller BL. Frontotemporal dementia: a bridge between dementia and neuromuscular disease. Ann N Y Acad Sci 2014; 1338:71-93. [PMID: 25557955 DOI: 10.1111/nyas.12638] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The concept that frontotemporal dementia (FTD) is a purely cortical dementia has largely been refuted by the recognition of its close association with motor neuron disease, and the identification of transactive response DNA-binding protein 43 (TDP-43) as a major pathological substrate underlying both diseases. Genetic findings have transformed this field and revealed connections between disorders that were previous thought clinically unrelated. The discovery that the C9ORF72 locus is responsible for the majority of hereditary FTD, amyotrophic lateral sclerosis (ALS), and FTD-ALS cases and the understanding that repeat-containing RNA plays a crucial role in pathogenesis of both disorders has paved the way for the development of potential biomarkers and therapeutic targets for these devastating diseases. In this review, we summarize the historical aspects leading up to our current understanding of the genetic, clinical, and neuropathological overlap between FTD and ALS, and include brief discussions on chronic traumatic encephalopathy (CTE), given its association with TDP-43 pathology, its associated increased dementia risk, and reports of ALS in CTE patients. In addition, we describe other genetic associations between dementia and neuromuscular disease, such as inclusion body myositis with Paget's disease and FTD.
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Affiliation(s)
- Adeline S L Ng
- Department of Neurology, National Neuroscience Institute, Tan Tock Seng Hospital, Novena, Singapore
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Ayaki T, Ito H, Fukushima H, Inoue T, Kondo T, Ikemoto A, Asano T, Shodai A, Fujita T, Fukui S, Morino H, Nakano S, Kusaka H, Yamashita H, Ihara M, Matsumoto R, Kawamata J, Urushitani M, Kawakami H, Takahashi R. Immunoreactivity of valosin-containing protein in sporadic amyotrophic lateral sclerosis and in a case of its novel mutant. Acta Neuropathol Commun 2014; 2:172. [PMID: 25492614 PMCID: PMC4297454 DOI: 10.1186/s40478-014-0172-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 11/27/2014] [Indexed: 12/19/2022] Open
Abstract
Background Mutations in the valosin-containing protein (VCP) gene were first found to cause inclusion- body myopathy with early-onset Paget disease and frontotemporal dementia (IBMPFD). Mutations in the VCP gene were later reported to occur in familial amyotrophic lateral sclerosis (ALS). But the role of VCP in the neurodegenerative processes that occur in ALS remains unknown. The purpose of the present study was to elucidate the role of VCP in the neurodegeneration seen in sporadic and VCP mutant ALS. Results Immunohistochemistry demonstrated that the frequency of distinct VCP-positive nuclei of spinal motor neurons of patients with sporadic ALS (SALS) and the ALS with VCP novel mutation (ALS-VCP, M158V) was increased, compared with that of the control cases. No VCP-positive inclusion bodies were observed in SALS patients, a ALS-VCP patient or in control subjects. Neuropathologic examination of the ALS-VCP case showed loss of motor neurons, the presence of Bunina bodies, and degeneration of the corticospinal tracts. Bunina bodies detected in this case were confirmed to show immunohistochemical and ultrastructural features similar to those previously described. Furthermore, neuronal intracytoplasmic inclusions immunopositive for TAR DNA-binding protein 43 kDa (TDP-43), phosphorylated TDP-43, ubiquitin (Ub), p62, and optineurin were identified in the spinal and medullary motoneurons, but not in the neocortex. Gene analysis of this ALS-VCP patient confirmed the de novo mutation of M158V, which was not found in control cases; and bioinformatics using several in silico analyses showed possible damage to the structure of VCP. Immunocytochemical study of cultured cells showed increased cytoplasmic translocation of TDP-43 in cells transfected with several mutant VCP including our patient’s compared with wild-type VCP. Conclusion These findings support the idea that VCP is associated with the pathomechanism of SALS and familial ALS with a VCP mutation, presumably acting through a dominant-negative mechanism. Electronic supplementary material The online version of this article (doi:10.1186/s40478-014-0172-0) contains supplementary material, which is available to authorized users.
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Abstract
Our understanding of amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disease, is expanding rapidly as its genetic causes are uncovered. The pace of new gene discovery over the last 5 years has accelerated, providing new insights into the pathogenesis of disease and highlighting biological pathways as targets for therapeutic development. This article reviews our current understanding of the heritability of ALS and provides an overview of each of the major ALS genes, highlighting their phenotypic characteristics and frequencies as a guide for clinicians evaluating patients with ALS.
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Affiliation(s)
- Matthew B Harms
- Neuromuscular Division, Department of Neurology, Hope Center for Neurological Disorders, Washington University School of Medicine, 660 South Euclid Avenue, St Louis, MO 63110, USA.
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74
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Su XW, Broach JR, Connor JR, Gerhard GS, Simmons Z. Genetic heterogeneity of amyotrophic lateral sclerosis: Implications for clinical practice and research. Muscle Nerve 2014; 49:786-803. [DOI: 10.1002/mus.24198] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2014] [Indexed: 12/26/2022]
Affiliation(s)
- Xiaowei W. Su
- Department of Neurosurgery; The Pennsylvania State University College of Medicine; Hershey Pennsylvania USA
| | - James R. Broach
- Department of Biochemistry and Molecular Biology; The Pennsylvania State University College of Medicine; Hershey Pennsylvania USA
| | - James R. Connor
- Department of Neurosurgery; The Pennsylvania State University College of Medicine; Hershey Pennsylvania USA
| | - Glenn S. Gerhard
- Department of Biochemistry and Molecular Biology; The Pennsylvania State University College of Medicine; Hershey Pennsylvania USA
| | - Zachary Simmons
- Department of Neurology; Penn State Milton S. Hershey Medical Center; 30 Hope Drive (Suite EC037) Hershey Pennsylvania 17033 USA
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75
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Jiao B, Tang B, Liu X, Yan X, Zhou L, Yang Y, Wang J, Xia K, Shen L. Identification of C9orf72 repeat expansions in patients with amyotrophic lateral sclerosis and frontotemporal dementia in mainland China. Neurobiol Aging 2014; 35:936.e19-22. [PMID: 24269022 DOI: 10.1016/j.neurobiolaging.2013.10.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 09/22/2013] [Accepted: 10/01/2013] [Indexed: 12/12/2022]
Affiliation(s)
- Bin Jiao
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; State Key Laboratory of Medical Genetics, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Xiaoyan Liu
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Xinxiang Yan
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Lin Zhou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Yi Yang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Junling Wang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Kun Xia
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; State Key Laboratory of Medical Genetics, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China
| | - Lu Shen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China; State Key Laboratory of Medical Genetics, Changsha 410008, China; Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha 410008, China.
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Krüger T, Lautenschläger J, Grosskreutz J, Rhode H. Proteome analysis of body fluids for amyotrophic lateral sclerosis biomarker discovery. Proteomics Clin Appl 2014; 7:123-35. [PMID: 23129563 DOI: 10.1002/prca.201200067] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 09/28/2012] [Accepted: 10/22/2012] [Indexed: 12/11/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disorder of motor neurons leading to death of the patients, mostly within 2-5 years after disease onset. The pathomechanism of motor neuron degeneration is only partially understood and therapeutic strategies based on mechanistic insights are largely ineffective. The discovery of reliable biomarkers of disease diagnosis and progression is the sine qua non of both the revelation of insights into the ALS pathomechanism and the assessment of treatment efficacies. Proteomic approaches are an important pillar in ALS biomarker discovery. Cerebrospinal fluid is the most promising body fluid for differential proteome analyses, followed by blood (serum, plasma), and even urine and saliva. The present study provides an overview about reported peptide/protein biomarker candidates that showed significantly altered levels in certain body fluids of ALS patients. These findings have to be discussed according to proposed pathomechanisms to identify modifiers of disease progression and to pave the way for the development of potential therapeutic strategies. Furthermore, limitations and advantages of proteomic approaches for ALS biomarker discovery in different body fluids and reliable validation of biomarker candidates have been addressed.
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Affiliation(s)
- Thomas Krüger
- Institute of Biochemistry 1, University Hospital, Jena, Germany.
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77
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Renton AE, Chiò A, Traynor BJ. State of play in amyotrophic lateral sclerosis genetics. Nat Neurosci 2014; 17:17-23. [PMID: 24369373 PMCID: PMC4544832 DOI: 10.1038/nn.3584] [Citation(s) in RCA: 1115] [Impact Index Per Article: 111.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 10/22/2013] [Indexed: 12/11/2022]
Abstract
Considerable progress has been made in unraveling the genetic etiology of amyotrophic lateral sclerosis (ALS), the most common form of adult-onset motor neuron disease and the third most common neurodegenerative disease overall. Here we review genes implicated in the pathogenesis of motor neuron degeneration and how this new information is changing the way we think about this fatal disorder. Specifically, we summarize current literature of the major genes underlying ALS, SOD1, TARDBP, FUS, OPTN, VCP, UBQLN2, C9ORF72 and PFN1, and evaluate the information being gleaned from genome-wide association studies. We also outline emerging themes in ALS research, such as next-generation sequencing approaches to identify de novo mutations, the genetic convergence of familial and sporadic ALS, the proposed oligogenic basis for the disease, and how each new genetic discovery is broadening the phenotype associated with the clinical entity we know as ALS.
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Affiliation(s)
- Alan E Renton
- Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, Maryland, USA
| | - Adriano Chiò
- Rita Levi Montalcini Department of Neuroscience, University of Turin, Turin, Italy
| | - Bryan J Traynor
- 1] Neuromuscular Diseases Research Unit, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, Maryland, USA. [2] Department of Neurology, Brain Sciences Institute, Johns Hopkins University, Baltimore, Maryland, USA
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Byrne S, Heverin M, Elamin M, Bede P, Lynch C, Kenna K, MacLaughlin R, Walsh C, Al Chalabi A, Hardiman O. Aggregation of neurologic and neuropsychiatric disease in amyotrophic lateral sclerosis kindreds: a population-based case-control cohort study of familial and sporadic amyotrophic lateral sclerosis. Ann Neurol 2013; 74:699-708. [PMID: 23836460 DOI: 10.1002/ana.23969] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2013] [Revised: 05/01/2013] [Accepted: 06/07/2013] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Amyotrophic lateral sclerosis (ALS) is associated with frontotemporal dementia (FTD) in 14% of cases. Five percent report a family history of ALS, and other ALS patients report a family history of other neurodegenerative diseases. The objective of this study was to conduct a family aggregation study of ALS, and neurodegenerative and neuropsychiatric conditions in ALS kindreds and matched healthy controls. The aim was to determine the true rate of familial ALS and the recurrence risk of ALS in family members, and to identify kindreds with increased aggregation of neurodegenerative and neuropsychiatric disease in the context of the recently described expanded hexanucleotide repeat in C9orf72. METHODS A prospective, population-based, case-control family aggregation study was conducted. Family history information was collected through questionnaires and interviews from ALS patients and matched controls. Cause of death was verified with death certification. The recurrence rate of ALS and the risk in family members of other neurodegenerative and neuropsychiatric disease was calculated using the relative risk (lambda) and cumulative risk using Kaplan-Meier analysis. RESULTS Medical histories from 9,684 first- and second-degree relatives of 172 ALS probands and 192 controls were obtained. Cause of death was verified in 2,494 cases. Sixteen percent (n=27) of ALS patients had a family history of ALS. The lifetime hazard ratio (HR) of developing ALS among first- and second-degree relatives was 34.3 (p<0.0001) in relatives of ALS patients with the C9orf72 repeat expansion, and 2.3 (p=0.019) in relatives of ALS patients without the expansion. The relatives of ALS patients also had an increased HR of developing a psychotic illness (HR=4.7, p=0.004, 95% confidence interval [CI]=1.6-12.3) and of suicide (HR=5.6, p<0.0001, 95% CI=2.4-12.9) INTERPRETATION: The true rate of familial ALS in Ireland is 16%. There is an overlap between ALS, FTD, and neuropsychiatric disease that is pronounced in kindreds with the C9orf72 repeat expansion, but is also present in kindreds of those without the C9orf72 expanded repeat.
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Affiliation(s)
- Susan Byrne
- Department of Neurology, Beaumont Hospital, Dublin, Ireland; Trinity Biomedical Sciences Institute, School of Medicine, Dublin, Ireland
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Antisense therapy in neurology. J Pers Med 2013; 3:144-76. [PMID: 25562650 PMCID: PMC4251390 DOI: 10.3390/jpm3030144] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 07/26/2013] [Accepted: 07/29/2013] [Indexed: 12/12/2022] Open
Abstract
Antisense therapy is an approach to fighting diseases using short DNA-like molecules called antisense oligonucleotides. Recently, antisense therapy has emerged as an exciting and promising strategy for the treatment of various neurodegenerative and neuromuscular disorders. Previous and ongoing pre-clinical and clinical trials have provided encouraging early results. Spinal muscular atrophy (SMA), Huntington’s disease (HD), amyotrophic lateral sclerosis (ALS), Duchenne muscular dystrophy (DMD), Fukuyama congenital muscular dystrophy (FCMD), dysferlinopathy (including limb-girdle muscular dystrophy 2B; LGMD2B, Miyoshi myopathy; MM, and distal myopathy with anterior tibial onset; DMAT), and myotonic dystrophy (DM) are all reported to be promising targets for antisense therapy. This paper focuses on the current progress of antisense therapies in neurology.
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80
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Shorter J, Taylor JP. Disease mutations in the prion-like domains of hnRNPA1 and hnRNPA2/B1 introduce potent steric zippers that drive excess RNP granule assembly. Rare Dis 2013; 1:e25200. [PMID: 25002999 PMCID: PMC3932941 DOI: 10.4161/rdis.25200] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 05/14/2013] [Accepted: 05/28/2013] [Indexed: 12/12/2022] Open
Abstract
Approximately 1% of human proteins harbor a prion-like domain (PrLD) of similar low complexity sequence and amino acid composition to domains that drive prionogenesis of yeast proteins like Sup35. PrLDs are over-represented in human RNA-binding proteins and mediate phase transitions underpinning RNP granule assembly. This modality renders PrLDs prone to misfold into conformers that accrue in pathological inclusions that characterize various fatal neurodegenerative diseases. For example, TDP-43 and FUS form cytoplasmic inclusions in amyotrophic lateral sclerosis (ALS) and mutations in TDP-43 and FUS can cause ALS. Here, we review our recent discovery of discrete missense mutations that alter a conserved gatekeeper aspartate residue in the PrLDs of hnRNPA2/B1 and hnRNPA1 and cause multisystem proteinopathy and ALS. The missense mutations generate potent steric zippers in the PrLDs, which enhance a natural propensity to form self-templating fibrils, promote recruitment to stress granules and drive cytoplasmic inclusion formation. PrLDs occur in ~250 human proteins and could contribute directly to the etiology of various degenerative disorders.
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Affiliation(s)
- James Shorter
- Department of Biochemistry and Biophysics; Perelman School of Medicine at The University of Pennsylvania; Philadelphia, PA USA
| | - J Paul Taylor
- Department of Developmental Neurobiology; St Jude Children's Research Hospital; Memphis, TN USA
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Abstract
The progression of motor neurone disease (MND) is currently irreversible, and the grave implications of diagnosis naturally fuels concern among neurologists over missing a potential mimic disorder. There is no diagnostic test for MND but in reality there are few plausible mimics in routine clinical practice. In the presence of a progressive pure motor disorder, signs such as florid fasciculations, bilateral tongue wasting, the ‘split hand’, head drop, emotionality, and cognitive or behavioural impairment carry high positive predictive value. MND is clinically heterogeneous, however, with some important chameleon-like presentations and considerable variation in clinical course. Lack of confidence about the scope of such variation, or an approach to diagnosis emphasising investigations over clinical common sense, has the potential to exacerbate diagnostic delay in MND and impede timely planning of the care which is essential to maximising quality of life.
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Affiliation(s)
- Martin R Turner
- University of Oxford Nuffield Department of Clinical Neurosciences, Oxford, UK.
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VCP is essential for mitochondrial quality control by PINK1/Parkin and this function is impaired by VCP mutations. Neuron 2013; 78:65-80. [PMID: 23498974 DOI: 10.1016/j.neuron.2013.02.029] [Citation(s) in RCA: 176] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2013] [Indexed: 12/12/2022]
Abstract
Mutations in VCP cause multisystem degeneration impacting the nervous system, muscle, and/or bone. Patients may present with ALS, Parkinsonism, frontotemporal dementia, myopathy, Paget's disease, or a combination of these. The disease mechanism is unknown. We developed a Drosophila model of VCP mutation-dependent degeneration. The phenotype is reminiscent of PINK1 and parkin mutants, including a pronounced mitochondrial defect. Indeed, VCP interacts genetically with the PINK1/parkin pathway in vivo. Paradoxically, VCP complements PINK1 deficiency but not parkin deficiency. The basis of this paradox is resolved by mechanistic studies in vitro showing that VCP recruitment to damaged mitochondria requires Parkin-mediated ubiquitination of mitochondrial targets. VCP recruitment coincides temporally with mitochondrial fission, and VCP is required for proteasome-dependent degradation of Mitofusins in vitro and in vivo. Further, VCP and its adaptor Npl4/Ufd1 are required for clearance of damaged mitochondria via the PINK1/Parkin pathway, and this is impaired by pathogenic mutations in VCP.
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83
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Novel valosin containing protein mutation in a Swiss family with hereditary inclusion body myopathy and dementia. Neuromuscul Disord 2013; 23:149-54. [DOI: 10.1016/j.nmd.2012.09.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2012] [Revised: 08/22/2012] [Accepted: 09/20/2012] [Indexed: 12/13/2022]
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Van Langenhove T, van der Zee J, Van Broeckhoven C. The molecular basis of the frontotemporal lobar degeneration-amyotrophic lateral sclerosis spectrum. Ann Med 2012; 44:817-28. [PMID: 22420316 PMCID: PMC3529157 DOI: 10.3109/07853890.2012.665471] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Accepted: 02/07/2012] [Indexed: 01/21/2023] Open
Abstract
There is increasing evidence that frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS) represent a continuum of neurodegenerative diseases. FTLD is complicated by ALS in a significant proportion of patients, and neuropsychological studies have demonstrated frontotemporal dysfunction in up to 50% of ALS patients. More recently, advances in neuropathology and molecular genetics have started to disclose the biological basis for the observed clinical concurrence. TDP-43 and FUS have been discovered as key pathological proteins in both FTLD and ALS. The most recent discovery of a pathological hexanucleotide repeat expansion in the gene C9orf72 as a frequent cause of both FTLD and ALS has eventually confirmed the association of these two at first sight distinct neurodegenerative diseases. Mutations in the TARDBP, FUS, and VCP genes had previously been associated with different phenotypes of the FTLD-ALS spectrum, although in these cases one end of the spectrum predominates. Whilst on the one hand providing evidence for overlap, these discoveries have also highlighted that FTLD and ALS are etiologically diverse. In this review, we review the recent advances that support the existence of an FTLD-ALS spectrum, with particular emphasis on the molecular genetic aspect.
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Affiliation(s)
- Tim Van Langenhove
- Neurodegenerative Brain Diseases Group, Department of Molecular Genetics, VIB, Antwerpen, Belgium
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85
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González-Pérez P, Cirulli ET, Drory VE, Dabby R, Nisipeanu P, Carasso RL, Sadeh M, Fox A, Festoff BW, Sapp PC, McKenna-Yasek D, Goldstein DB, Brown RH, Blumen SC. Novel mutation in VCP gene causes atypical amyotrophic lateral sclerosis. Neurology 2012; 79:2201-8. [PMID: 23152587 DOI: 10.1212/wnl.0b013e318275963b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
OBJECTIVE To identify the genetic variant that causes autosomal dominantly inherited motor neuron disease in a 4-generation Israeli-Arab family using genetic linkage and whole exome sequencing. METHODS Genetic linkage analysis was performed in this family using Illumina single nucleotide polymorphism chips. Whole exome sequencing was then undertaken on DNA samples from 2 affected family members using an Illumina 2000 HiSeq platform in pursuit of potentially pathogenic genetic variants that comigrate with the disease in this pedigree. Variants meeting these criteria were then screened in all affected individuals. RESULTS A novel mutation (p.R191G) in the valosin-containing protein (VCP) gene was identified in the index family. Direct sequencing of the VCP gene in a panel of DNA from 274 unrelated individuals with familial amyotrophic lateral sclerosis (FALS) revealed 5 additional mutations. Among them, 2 were previously identified in pedigrees with a constellation of inclusion body myopathy with Paget disease of the bone and frontotemporal dementia (IBMPFD) and in FALS, and 2 other mutations (p.R159C and p.R155C) in IBMPFD alone. We did not detect VCP gene mutations in DNA from 178 cases of sporadic amyotrophic lateral sclerosis. CONCLUSIONS We report a novel VCP mutation identified in an amyotrophic lateral sclerosis family (p.R191G) with atypical clinical features. In our experience, VCP mutations arise in approximately 1.5% of FALS cases. Our study supports the view that motor neuron disease is part of the clinical spectrum of VCP-associated disease.
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Affiliation(s)
- Paloma González-Pérez
- Department of Neurology, University of Massachusetts Medical School, Worcester, MA, USA
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Sieben A, Van Langenhove T, Engelborghs S, Martin JJ, Boon P, Cras P, De Deyn PP, Santens P, Van Broeckhoven C, Cruts M. The genetics and neuropathology of frontotemporal lobar degeneration. Acta Neuropathol 2012; 124:353-72. [PMID: 22890575 PMCID: PMC3422616 DOI: 10.1007/s00401-012-1029-x] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 07/21/2012] [Accepted: 07/27/2012] [Indexed: 12/12/2022]
Abstract
Frontotemporal lobar degeneration (FTLD) is a heterogeneous group of disorders characterized by disturbances of behavior and personality and different types of language impairment with or without concomitant features of motor neuron disease or parkinsonism. FTLD is characterized by atrophy of the frontal and anterior temporal brain lobes. Detailed neuropathological studies have elicited proteinopathies defined by inclusions of hyperphosphorylated microtubule-associated protein tau, TAR DNA-binding protein TDP-43, fused-in-sarcoma or yet unidentified proteins in affected brain regions. Rather than the type of proteinopathy, the site of neurodegeneration correlates relatively well with the clinical presentation of FTLD. Molecular genetic studies identified five disease genes, of which the gene encoding the tau protein (MAPT), the growth factor precursor gene granulin (GRN), and C9orf72 with unknown function are most frequently mutated. Rare mutations were also identified in the genes encoding valosin-containing protein (VCP) and charged multivesicular body protein 2B (CHMP2B). These genes are good markers to distinguish underlying neuropathological phenotypes. Due to the complex landscape of FTLD diseases, combined characterization of clinical, imaging, biological and genetic biomarkers is essential to establish a detailed diagnosis. Although major progress has been made in FTLD research in recent years, further studies are needed to completely map out and correlate the clinical, pathological and genetic entities, and to understand the underlying disease mechanisms. In this review, we summarize the current state of the rapidly progressing field of genetic, neuropathological and clinical research of this intriguing condition.
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Affiliation(s)
- Anne Sieben
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neurodegenerative Brain Diseases Group, VIB Department of Molecular Genetics, University of Antwerp, CDE, Universiteitsplein 1, 2610 Antwerpen, Belgium
- Department of Neurology, University Hospital Ghent and University of Ghent, Ghent, Belgium
| | - Tim Van Langenhove
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neurodegenerative Brain Diseases Group, VIB Department of Molecular Genetics, University of Antwerp, CDE, Universiteitsplein 1, 2610 Antwerpen, Belgium
- Department of Neurology, University Hospital Antwerp, Antwerpen, Belgium
| | - Sebastiaan Engelborghs
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Department of Neurology and Memory Clinic, Hospital Network Antwerp Middelheim and Hoge Beuken, Antwerpen, Belgium
| | | | - Paul Boon
- Department of Neurology, University Hospital Ghent and University of Ghent, Ghent, Belgium
| | - Patrick Cras
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Department of Neurology, University Hospital Antwerp, Antwerpen, Belgium
| | - Peter-Paul De Deyn
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Department of Neurology and Memory Clinic, Hospital Network Antwerp Middelheim and Hoge Beuken, Antwerpen, Belgium
- Alzheimer Research Center, University Medical Center Groningen, Groningen, The Netherlands
| | - Patrick Santens
- Department of Neurology, University Hospital Ghent and University of Ghent, Ghent, Belgium
| | - Christine Van Broeckhoven
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neurodegenerative Brain Diseases Group, VIB Department of Molecular Genetics, University of Antwerp, CDE, Universiteitsplein 1, 2610 Antwerpen, Belgium
| | - Marc Cruts
- Institute Born-Bunge, University of Antwerp, Antwerpen, Belgium
- Neurodegenerative Brain Diseases Group, VIB Department of Molecular Genetics, University of Antwerp, CDE, Universiteitsplein 1, 2610 Antwerpen, Belgium
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87
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The genetics and neuropathology of amyotrophic lateral sclerosis. Acta Neuropathol 2012; 124:339-52. [PMID: 22903397 DOI: 10.1007/s00401-012-1022-4] [Citation(s) in RCA: 277] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 07/16/2012] [Accepted: 07/18/2012] [Indexed: 12/11/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease of motor neurons leading to death from respiratory failure within about 3 years of symptom onset. A family history of ALS is obtained in about 5 % but the distinction between familial and apparently sporadic ALS is artificial and genetic factors play a role in all types. For several years, only one gene was known to have a role in ALS pathogenesis, SOD1. In the last few years there has been a rapid advance in our genetic knowledge of the causes of ALS, and the relationship of the genetic subtypes with pathological subtypes and clinical phenotype. Mutations in the gene for TDP-43 protein, TARDBP, highlight this, with pathology mimicking closely that found in other types of ALS, and a phenotypic spectrum that includes frontotemporal dementia. Mutations in the FUS gene, closely related to TDP-43, lead to a similar clinical phenotype but distinct pathology, so that the three pathological groups represented by SOD1, TARDBP, and FUS are distinct. In this review, we explore the genetic architecture of ALS, highlight some of the genes implicated in pathogenesis, and describe their phenotypic range and overlap with other diseases.
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Spina S, Van Laar AD, Murrell JR, Hamilton RL, Kofler JK, Epperson F, Farlow MR, Lopez OL, Quinlan J, DeKosky ST, Ghetti B. Phenotypic variability in three families with valosin-containing protein mutation. Eur J Neurol 2012; 20:251-8. [PMID: 22900631 DOI: 10.1111/j.1468-1331.2012.03831.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Accepted: 06/29/2012] [Indexed: 12/31/2022]
Abstract
BACKGROUND AND PURPOSE The phenotype of IBMPFD [inclusion body myopathy with Paget's disease of the bone and frontotemporal dementia (FTD)] associated with valosin-containing protein (VCP) mutation is described in three families. METHODS Probands were identified based on a pathological diagnosis of frontotemporal lobar degeneration with TDP-43-positive inclusions type IV. VCP sequencing was carried out. Clinical data on affected family members were reviewed. RESULTS Ohio family: four subjects presented muscle weakness and wasting. (One subject had both neuropathic and myopathic findings and another subject showed only evidence of myopathy. The etiology of weakness could not be ascertained in the remaining two subjects.) Two individuals also showed Parkinsonism (with associated FTD in one of the two). The proband's brain displayed FTLD-TDP type IV and Braak stage five Parkinson's disease (PD). A VCP R191Q mutation was found. Pennsylvania family: 11 subjects developed IBMPFD. Parkinsonism was noted in two mutation carriers, whilst another subject presented with primary progressive aphasia (PPA). A novel VCP T262A mutation was found. Indiana family: three subjects developed IBMPFD. FTD was diagnosed in two individuals and suspected in the third one who also displayed muscle weakness. A VCP R159C mutation was found. CONCLUSIONS We identified three families with IBMPFD associated with VCP mutations. Clinical and pathological PD was documented for the first time in members of two families. A novel T262A mutation was found. One individual had PPA: an uncommon presentation of IBMPFD.
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Affiliation(s)
- S Spina
- Department of Pathology and Laboratory Medicine, Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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