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Gould R, Brady S. Identifying mRNAs Residing in Myelinating Oligodendrocyte Processes as a Basis for Understanding Internode Autonomy. Life (Basel) 2023; 13:life13040945. [PMID: 37109474 PMCID: PMC10142070 DOI: 10.3390/life13040945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/28/2023] [Accepted: 03/31/2023] [Indexed: 04/07/2023] Open
Abstract
In elaborating and maintaining myelin sheaths on multiple axons/segments, oligodendrocytes distribute translation of some proteins, including myelin basic protein (MBP), to sites of myelin sheath assembly, or MSAS. As mRNAs located at these sites are selectively trapped in myelin vesicles during tissue homogenization, we performed a screen to identify some of these mRNAs. To confirm locations, we used real-time quantitative polymerase chain reaction (RT-qPCR), to measure mRNA levels in myelin (M) and ‘non-myelin’ pellet (P) fractions, and found that five (LPAR1, TRP53INP2, TRAK2, TPPP, and SH3GL3) of thirteen mRNAs were highly enriched in myelin (M/P), suggesting residences in MSAS. Because expression by other cell-types will increase p-values, some MSAS mRNAs might be missed. To identify non-oligodendrocyte expression, we turned to several on-line resources. Although neurons express TRP53INP2, TRAK2 and TPPP mRNAs, these expressions did not invalidate recognitions as MSAS mRNAs. However, neuronal expression likely prevented recognition of KIF1A and MAPK8IP1 mRNAs as MSAS residents and ependymal cell expression likely prevented APOD mRNA assignment to MSAS. Complementary in situ hybridization (ISH) is recommended to confirm residences of mRNAs in MSAS. As both proteins and lipids are synthesized in MSAS, understanding myelination should not only include efforts to identify proteins synthesized in MSAS, but also the lipids.
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Affiliation(s)
- Robert Gould
- Whitman Research Center, Marine Biology Laboratory, Woods Hole, MA 02543, USA
| | - Scott Brady
- Departments of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL 60612, USA
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2
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Abstract
Animal models with high translational validity are essential tools in understanding disease pathogenesis and in the development of therapeutic strategies. Multiple sclerosis (MS) is an autoimmune demyelinating disease of the central nervous system characterized by progressive neurological deficits and socioeconomic burden. Experimental autoimmune encephalomyelitis (EAE) is the most extensively utilized animal model of MS, with well-characterized rodent and non-human primate variants. The EAE model is typically induced by either active immunization with myelin-derived proteins or peptides in adjuvant or by passive transfer of activated myelin-specific CD4+ T lymphocytes. To date, the EAE model has been an essential tool in the development of at least seven U.S. Food and Drug Administration (FDA)-approved immunomodulatory drugs for the treatment of MS, including glatiramer acetate, fingolimod, and natalizumab. However, the translational validity of the EAE model is frequently compromised due to poor study design, inconsistent clinical scoring endpoints, and inappropriate statistical calculations. No single animal model accurately reflects the complexity of human MS pathogenesis. Beyond EAE, multiple additional animal models are described, including Theiler's murine encephalomyelitis virus and cuprizone-induced demyelination, which facilitate the study of pathogen-induced CNS autoimmunity and remyelination, respectively. This overview summarizes several of the most frequently used animal models of MS and highlights key factors that significantly influence the experimental outcome and affect translational validity. © 2021 Wiley Periodicals LLC.
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Affiliation(s)
- Paul Smith
- Incyte Research Institute, Wilmington, Delaware
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3
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Rich KA, Roggenbuck J, Kolb SJ. Searching Far and Genome-Wide: The Relevance of Association Studies in Amyotrophic Lateral Sclerosis. Front Neurosci 2021; 14:603023. [PMID: 33584177 PMCID: PMC7873947 DOI: 10.3389/fnins.2020.603023] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 12/03/2020] [Indexed: 11/13/2022] Open
Abstract
Genome-wide association studies (GWAS) and rare variant association studies (RVAS) are applied across many areas of complex disease to analyze variation in whole genomes of thousands of unrelated patients. These approaches are able to identify variants and/or biological pathways which are associated with disease status and, in contrast to traditional linkage studies or candidate gene approaches, do so without requiring multigenerational affected families, prior hypotheses, or known genes of interest. However, the novel associations identified by these methods typically have lower effect sizes than those found in classical family studies. In the motor neuron disease amyotrophic lateral sclerosis (ALS), GWAS, and RVAS have been used to identify multiple disease-associated genes but have not yet resulted in novel therapeutic interventions. There is significant urgency within the ALS community to identify additional genetic markers of disease to uncover novel biological mechanisms, stratify genetic subgroups of disease, and drive drug development. Given the widespread and increasing application of genetic association studies of complex disease, it is important to recognize the strengths and limitations of these approaches. Here, we review ALS gene discovery via GWAS and RVAS.
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Affiliation(s)
- Kelly A Rich
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Jennifer Roggenbuck
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Stephen J Kolb
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, United States.,Department of Biological Chemistry and Pharmacology, The Ohio State University Wexner Medical Center, Columbus, OH, United States
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4
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Raasakka A, Kursula P. Flexible Players within the Sheaths: The Intrinsically Disordered Proteins of Myelin in Health and Disease. Cells 2020; 9:cells9020470. [PMID: 32085570 PMCID: PMC7072810 DOI: 10.3390/cells9020470] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 02/16/2020] [Accepted: 02/16/2020] [Indexed: 02/07/2023] Open
Abstract
Myelin ensheathes selected axonal segments within the nervous system, resulting primarily in nerve impulse acceleration, as well as mechanical and trophic support for neurons. In the central and peripheral nervous systems, various proteins that contribute to the formation and stability of myelin are present, which also harbor pathophysiological roles in myelin disease. Many myelin proteins have common attributes, including small size, hydrophobic segments, multifunctionality, longevity, and regions of intrinsic disorder. With recent advances in protein biophysical characterization and bioinformatics, it has become evident that intrinsically disordered proteins (IDPs) are abundant in myelin, and their flexible nature enables multifunctionality. Here, we review known myelin IDPs, their conservation, molecular characteristics and functions, and their disease relevance, along with open questions and speculations. We place emphasis on classifying the molecular details of IDPs in myelin, and we correlate these with their various functions, including susceptibility to post-translational modifications, function in protein–protein and protein–membrane interactions, as well as their role as extended entropic chains. We discuss how myelin pathology can relate to IDPs and which molecular factors are potentially involved.
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Affiliation(s)
- Arne Raasakka
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, NO-5009 Bergen, Norway;
| | - Petri Kursula
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, NO-5009 Bergen, Norway;
- Faculty of Biochemistry and Molecular Medicine & Biocenter Oulu, University of Oulu, Aapistie 7A, FI-90220 Oulu, Finland
- Correspondence:
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5
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Ragagnin AMG, Shadfar S, Vidal M, Jamali MS, Atkin JD. Motor Neuron Susceptibility in ALS/FTD. Front Neurosci 2019; 13:532. [PMID: 31316328 PMCID: PMC6610326 DOI: 10.3389/fnins.2019.00532] [Citation(s) in RCA: 119] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 05/08/2019] [Indexed: 12/11/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by the death of both upper and lower motor neurons (MNs) in the brain, brainstem and spinal cord. The neurodegenerative mechanisms leading to MN loss in ALS are not fully understood. Importantly, the reasons why MNs are specifically targeted in this disorder are unclear, when the proteins associated genetically or pathologically with ALS are expressed ubiquitously. Furthermore, MNs themselves are not affected equally; specific MNs subpopulations are more susceptible than others in both animal models and human patients. Corticospinal MNs and lower somatic MNs, which innervate voluntary muscles, degenerate more readily than specific subgroups of lower MNs, which remain resistant to degeneration, reflecting the clinical manifestations of ALS. In this review, we discuss the possible factors intrinsic to MNs that render them uniquely susceptible to neurodegeneration in ALS. We also speculate why some MN subpopulations are more vulnerable than others, focusing on both their molecular and physiological properties. Finally, we review the anatomical network and neuronal microenvironment as determinants of MN subtype vulnerability and hence the progression of ALS.
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Affiliation(s)
- Audrey M G Ragagnin
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia
| | - Sina Shadfar
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia
| | - Marta Vidal
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia
| | - Md Shafi Jamali
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia
| | - Julie D Atkin
- Centre for Motor Neuron Disease Research, Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, NSW, Australia.,Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, Australia
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6
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Kon T, Tanji K, Mori F, Kimura A, Kakita A, Wakabayashi K. Immunoreactivity of myelin-associated oligodendrocytic basic protein in Lewy bodies. Neuropathology 2019; 39:279-285. [PMID: 31183926 DOI: 10.1111/neup.12564] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 04/25/2019] [Accepted: 05/03/2019] [Indexed: 11/27/2022]
Abstract
Myelin-associated oligodendrocytic basic protein (MOBP) plays a role in structural maintenance of the myelin sheath in the central nervous system. Recent genome analyses have revealed that mutation in MOBP is a risk factor for various neurodegenerative diseases, including Alzheimer's disease (AD), tauopathies and transactivation response DNA-binding protein 43 kDa proteinopathies. Proteomics analysis has shown that MOBP is a component of cortical Lewy bodies (LBs). However, the immunohistochemical localization of MOBP in the human brain is not known. Using immunohistochemistry, we examined the brain, spinal cord and peripheral ganglia from patients with various neurodegenerative diseases and control subjects. In normal controls, MOBP immunoreactivity was evident in the myelin in the central and peripheral nervous systems (PNS), and neuronal cytoplasm in both the central and PNS. In Parkinson's disease and dementia with LBs, MOBP immunoreactivity was found in the core of LBs in the brainstem, cingulate cortex and sympathetic ganglia. No MOBP immunoreactivity was found in a variety of other neuronal or glial inclusions in other disorders, including multiple system atrophy, AD, Pick's disease, progressive supranuclear palsy, corticobasal degeneration, argyrophilic grain disease, amyotrophic lateral sclerosis and frontotemporal lobar degeneration. Considering that up-regulation of MOBP has been reported in neurotoxic conditions, accumulation of MOBP in LBs may imply a cytoprotective mechanism in LB disease.
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Affiliation(s)
- Tomoya Kon
- Department of Neuropathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kunikazu Tanji
- Department of Neuropathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Fumiaki Mori
- Department of Neuropathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Akari Kimura
- Department of Neuropathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Akiyoshi Kakita
- Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Koichi Wakabayashi
- Department of Neuropathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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7
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Chen Z, Chen JA, Shatunov A, Jones AR, Kravitz SN, Huang AY, Lawrence L, Lowe JK, Lewis CM, Payan CAM, Lieb W, Franke A, Deloukas P, Amouyel P, Tzourio C, Dartigues JF, Ludolph A, Bensimon G, Leigh PN, Bronstein JM, Coppola G, Geschwind DH, Al-Chalabi A. Genome-wide survey of copy number variants finds MAPT duplications in progressive supranuclear palsy. Mov Disord 2019; 34:1049-1059. [PMID: 31059154 DOI: 10.1002/mds.27702] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 02/01/2019] [Accepted: 02/26/2019] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Progressive supranuclear palsy is a neurodegenerative tauopathy manifesting clinically as a progressive akinetic-rigid syndrome. In this study, we sought to identify genetic variants influencing PSP susceptibility through a genome-wide association analysis of a cohort of well-characterized patients who had participated in the Neuroprotection and Natural History in Parkinson Plus Syndromes and Blood Brain Barrier in Parkinson Plus Syndromes studies. METHODS We genotyped single-nucleotide polymorphisms in 283 PSP cases from the United Kingdom, Germany, and France and compared these with genotypes from 4472 controls. Copy number variants were identified from genotyping data. RESULTS We observed associations on chromosome 17 within or close to the MAPT gene and explored the genetic architecture at this locus. We confirmed the previously reported association of rs1768208 in the MOBP gene (P = 3.29 × 10-13 ) and rs1411478 in STX6 (P = 3.45 × 10-10 ). The population-attributable risk from the MAPT, MOBP, and STX6 single-nucleotide polymorphisms was found to be 0.37, 0.26, and 0.08, respectively. In addition, we found 2 instances of copy number variants spanning the MAPT gene in patients with PSP. These copy number variants include tau but few other genes within the chromosome 17 haplotype region, providing additional support for the direct pathogenicity of MAPT in PSP. CONCLUSIONS Clinicians should also be aware of MAPT duplication as a possible genetic cause of PSP, especially in patients presenting with young age at onset. © 2019 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Zhongbo Chen
- Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, UK
| | - Jason A Chen
- Interdepartmental Program in Bioinformatics, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Aleksey Shatunov
- Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, UK
| | - Ashley R Jones
- Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, UK
| | - Stephanie N Kravitz
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Alden Y Huang
- Interdepartmental Program in Bioinformatics, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Lauren Lawrence
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Jennifer K Lowe
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Cathryn M Lewis
- Social, Genetic and Developmental Psychiatry Centre, and Department of Medical and Molecular Genetics, King's College London, UK
| | - Christine A M Payan
- Département de Pharmacologie Clinique, Hôpital de la Pitié-Salpétrière, Assistance Publique Hôpitaux de Paris, Paris; Pharmacologie, Universités Paris-Sorbonne, UPMC Paris 06, Paris, France
| | - Wolfgang Lieb
- Institute of Epidemiology and Biobank Popgen, Christian Albrechts Universitat zu Kiel, Kiel, Germany
| | - Andre Franke
- Institute of Clinical Molecular Biology, Christian Albrechts Universitat zu Kiel, Kiel, Germany
| | - Panagiotis Deloukas
- William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London, UK
| | - Philippe Amouyel
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, U1167 - RID-AGE - Risk Factor and Molecular Determinants of Aging Diseases, Labex-Distalz, Lille, France
| | - Christophe Tzourio
- University of Bordeaux, INSERM, Bordeaux Population Health Research Centre, UMR-1219, CHU Bordeaux, France
| | - Jean-François Dartigues
- University of Bordeaux, INSERM, Bordeaux Population Health Research Centre, UMR-1219, CHU Bordeaux, France
| | - Albert Ludolph
- Department of Neurology, University of Ulm, Oberer Eselsberg, Ulm, Germany
| | - Gilbert Bensimon
- Département de Pharmacologie Clinique, Hôpital de la Pitié-Salpétrière, Assistance Publique Hôpitaux de Paris, Paris; Pharmacologie, Universités Paris-Sorbonne, UPMC Paris 06, Paris, France
| | - P Nigel Leigh
- Trafford Centre for Biomedical Research, Brighton and Sussex Medical School, University of Sussex, Falmer, Brighton, UK
| | - Jeff M Bronstein
- Program in Movement Disorders, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Giovanni Coppola
- Interdepartmental Program in Bioinformatics, David Geffen School of Medicine, University of California, Los Angeles, California, USA
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
- Center for Neurobehavioral Genetics, Semel Institute, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Daniel H Geschwind
- Program in Neurogenetics, Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California, USA
- Social, Genetic and Developmental Psychiatry Centre, and Department of Medical and Molecular Genetics, King's College London, UK
- Department of Human Genetics, University of California, Los Angeles, California, USA
| | - Ammar Al-Chalabi
- Department of Basic and Clinical Neuroscience, Maurice Wohl Clinical Neuroscience Institute, King's College London, London, UK
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8
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Hegyi H. Connecting myelin-related and synaptic dysfunction in schizophrenia with SNP-rich gene expression hubs. Sci Rep 2017; 7:45494. [PMID: 28382934 PMCID: PMC5382542 DOI: 10.1038/srep45494] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/27/2017] [Indexed: 12/12/2022] Open
Abstract
Combining genome-wide mapping of SNP-rich regions in schizophrenics and gene expression data in all brain compartments across the human life span revealed that genes with promoters most frequently mutated in schizophrenia are expression hubs interacting with far more genes than the rest of the genome. We summed up the differentially methylated “expression neighbors” of genes that fall into one of 108 distinct schizophrenia-associated loci with high number of SNPs. Surprisingly, the number of expression neighbors of the genes in these loci were 35 times higher for the positively correlating genes (32 times higher for the negatively correlating ones) than for the rest of the ~16000 genes. While the genes in the 108 loci have little known impact in schizophrenia, we identified many more known schizophrenia-related important genes with a high degree of connectedness (e.g. MOBP, SYNGR1 and DGCR6), validating our approach. Both the most connected positive and negative hubs affected synapse-related genes the most, supporting the synaptic origin of schizophrenia. At least half of the top genes in both the correlating and anti-correlating categories are cancer-related, including oncogenes (RRAS and ALDOA), providing further insight into the observed inverse relationship between the two diseases.
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Affiliation(s)
- Hedi Hegyi
- CEITEC - Central European Institute of Technology, Masaryk University, 62500 Brno, Czech Republic
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9
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Allen M, Burgess JD, Ballard T, Serie D, Wang X, Younkin CS, Sun Z, Kouri N, Baheti S, Wang C, Carrasquillo MM, Nguyen T, Lincoln S, Malphrus K, Murray M, Golde TE, Price ND, Younkin SG, Schellenberg GD, Asmann Y, Ordog T, Crook J, Dickson D, Ertekin-Taner N. Gene expression, methylation and neuropathology correlations at progressive supranuclear palsy risk loci. Acta Neuropathol 2016; 132:197-211. [PMID: 27115769 DOI: 10.1007/s00401-016-1576-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 04/14/2016] [Accepted: 04/15/2016] [Indexed: 01/12/2023]
Abstract
To determine the effects of single nucleotide polymorphisms (SNPs) identified in a genome-wide association study of progressive supranuclear palsy (PSP), we tested their association with brain gene expression, CpG methylation and neuropathology. In 175 autopsied PSP subjects, we performed associations between seven PSP risk variants and temporal cortex levels of 20 genes in-cis, within ±100 kb. Methylation measures were collected using reduced representation bisulfite sequencing in 43 PSP brains. To determine whether SNP/expression associations are due to epigenetic modifications, CpG methylation levels of associated genes were tested against relevant variants. Quantitative neuropathology endophenotypes were tested for SNP associations in 422 PSP subjects. Brain levels of LRRC37A4 and ARL17B were associated with rs8070723; MOBP with rs1768208 and both ARL17A and ARL17B with rs242557. Expression associations for LRRC37A4 and MOBP were available in an additional 100 PSP subjects. Meta-analysis revealed highly significant associations for PSP risk alleles of rs8070723 and rs1768208 with higher LRRC37A4 and MOBP brain levels, respectively. Methylation levels of one CpG in the 3' region of ARL17B associated with rs242557 and rs8070723. Additionally, methylation levels of an intronic ARL17A CpG associated with rs242557 and that of an intronic MOBP CpG with rs1768208. MAPT and MOBP region risk alleles also associated with higher levels of neuropathology. Strongest associations were observed for rs242557/coiled bodies and tufted astrocytes; and for rs1768208/coiled bodies and tau threads. These findings suggest that PSP variants at MAPT and MOBP loci may confer PSP risk via influencing gene expression and tau neuropathology. MOBP, LRRC37A4, ARL17A and ARL17B warrant further assessment as candidate PSP risk genes. Our findings have implications for the mechanism of action of variants at some of the top PSP risk loci.
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Affiliation(s)
- Mariet Allen
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Jeremy D Burgess
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Travis Ballard
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Daniel Serie
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Xue Wang
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Curtis S Younkin
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Zhifu Sun
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Naomi Kouri
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Saurabh Baheti
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Chen Wang
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Thuy Nguyen
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Sarah Lincoln
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Kimberly Malphrus
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Melissa Murray
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Todd E Golde
- Department of Neuroscience, Center for Translational Research in Neurodegenerative Disease, McKnight Brain Institute, University of Florida, Gainesville, FL, 32610, USA
| | - Nathan D Price
- Institute for Systems Biology, 401 Terry Avenue N, Seattle, WA, 98109, USA
| | - Steven G Younkin
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Gerard D Schellenberg
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Yan Asmann
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Tamas Ordog
- Department of Physiology and Biomedical Engineering and Center for Individualized Medicine, Mayo Clinic, Rochester, MN, 55905, USA
| | - Julia Crook
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Dennis Dickson
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA
| | - Nilüfer Ertekin-Taner
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, 32224, USA.
- Department of Neurology, Mayo Clinic, Jacksonville, FL, 32224, USA.
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10
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Kouri N, Ross OA, Dombroski B, Younkin CS, Serie DJ, Soto-Ortolaza A, Baker M, Finch NCA, Yoon H, Kim J, Fujioka S, McLean CA, Ghetti B, Spina S, Cantwell LB, Farlow MR, Grafman J, Huey ED, Ryung Han M, Beecher S, Geller ET, Kretzschmar HA, Roeber S, Gearing M, Juncos JL, Vonsattel JPG, Van Deerlin VM, Grossman M, Hurtig HI, Gross RG, Arnold SE, Trojanowski JQ, Lee VM, Wenning GK, White CL, Höglinger GU, Müller U, Devlin B, Golbe LI, Crook J, Parisi JE, Boeve BF, Josephs KA, Wszolek ZK, Uitti RJ, Graff-Radford NR, Litvan I, Younkin SG, Wang LS, Ertekin-Taner N, Rademakers R, Hakonarsen H, Schellenberg GD, Dickson DW. Genome-wide association study of corticobasal degeneration identifies risk variants shared with progressive supranuclear palsy. Nat Commun 2015; 6:7247. [PMID: 26077951 PMCID: PMC4469997 DOI: 10.1038/ncomms8247] [Citation(s) in RCA: 143] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 04/17/2015] [Indexed: 11/09/2022] Open
Abstract
Corticobasal degeneration (CBD) is a neurodegenerative disorder affecting movement and cognition, definitively diagnosed only at autopsy. Here, we conduct a genome-wide association study (GWAS) in CBD cases (n=152) and 3,311 controls, and 67 CBD cases and 439 controls in a replication stage. Associations with meta-analysis were 17q21 at MAPT (P=1.42 × 10(-12)), 8p12 at lnc-KIF13B-1, a long non-coding RNA (rs643472; P=3.41 × 10(-8)), and 2p22 at SOS1 (rs963731; P=1.76 × 10(-7)). Testing for association of CBD with top progressive supranuclear palsy (PSP) GWAS single-nucleotide polymorphisms (SNPs) identified associations at MOBP (3p22; rs1768208; P=2.07 × 10(-7)) and MAPT H1c (17q21; rs242557; P=7.91 × 10(-6)). We previously reported SNP/transcript level associations with rs8070723/MAPT, rs242557/MAPT, and rs1768208/MOBP and herein identified association with rs963731/SOS1. We identify new CBD susceptibility loci and show that CBD and PSP share a genetic risk factor other than MAPT at 3p22 MOBP (myelin-associated oligodendrocyte basic protein).
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Affiliation(s)
- Naomi Kouri
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Owen A Ross
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Beth Dombroski
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Curtis S Younkin
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA.,Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Daniel J Serie
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Alexandra Soto-Ortolaza
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Matthew Baker
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Ni Cole A Finch
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Hyejin Yoon
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Jungsu Kim
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Shinsuke Fujioka
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Catriona A McLean
- Victorian Brain Bank Network, Mental Health Research Institute, Parksville, Victoria 3052, Australia
| | - Bernardino Ghetti
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA
| | - Salvatore Spina
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA
| | - Laura B Cantwell
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Martin R Farlow
- Department of Neurology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA
| | - Jordan Grafman
- Cognitive Neuroscience Laboratory, Brain Injury Research, Rehabilitation Institute of Chicago, Chicago, Illinois 60611, USA.,Department of Physical Medicine and Rehabilitation, Northwestern University, Illinois 60208, USA
| | - Edward D Huey
- Departments of Psychiatry and Neurology, Columbia University, New York, New York10027, USA
| | - Mi Ryung Han
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Sherry Beecher
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Evan T Geller
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Hans A Kretzschmar
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Sigrun Roeber
- Institut for Neuropathology and Prion Research and Brain Net Germany, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Marla Gearing
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia 30307, USA
| | - Jorge L Juncos
- Department of Neurology, Emory University, Atlanta, Georgia 30307, USA
| | - Jean Paul G Vonsattel
- Department of Pathology and the Taub Institute for Research on Alzheimer's disease and the Aging Brain, Columbia University, New York, New York 10027, USA
| | - Vivianna M Van Deerlin
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Murray Grossman
- Department of Neurology, University of Pennsylvania Health System, Philadelphia, Pennsylvania 19104, USA
| | - Howard I Hurtig
- Department of Neurology, University of Pennsylvania Health System, Philadelphia, Pennsylvania 19104, USA
| | - Rachel G Gross
- Department of Neurology, University of Pennsylvania Health System, Philadelphia, Pennsylvania 19104, USA
| | - Steven E Arnold
- Department of Psychiatry, Center for Neurobiology and Behavior, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA
| | - John Q Trojanowski
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Virginia M Lee
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Gregor K Wenning
- Department of Neurology, Innsbruck Medical University, Innsbruck 6020, Austria
| | - Charles L White
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA
| | - Günter U Höglinger
- Department of Neurology, Technical University Munich, 81377 Munich, Germany.,Department of Translational Neurodegeneration, German Center for Neurodegenerative Diseases (DZNE), 81677 Munich, Germany.,Department of Neurology, Philipps University, 35033 Marburg, Germany
| | - Ulrich Müller
- Institut for Humangenetik, Justus-Liebig-Universität, Giessen 35390, Germany
| | - Bernie Devlin
- Department of Human Genetics, University of Pittsburgh, Pittsburg, Pennsylvania 15260, USA
| | - Lawrence I Golbe
- Department of Neurology, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey 08901, USA
| | - Julia Crook
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA.,Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Joseph E Parisi
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota 55905, USA
| | - Bradley F Boeve
- Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905, USA
| | - Keith A Josephs
- Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905, USA
| | | | - Ryan J Uitti
- Department of Neurology, Mayo Clinic, Jacksonville, Florida 32224, USA
| | | | - Irene Litvan
- Department of Neurosciences, University of California, San Diego, La Jolla, California 92093, USA
| | - Steven G Younkin
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Li-San Wang
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Nilüfer Ertekin-Taner
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA.,Department of Neurology, Mayo Clinic, Jacksonville, Florida 32224, USA
| | - Rosa Rademakers
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
| | - Hakon Hakonarsen
- Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA
| | - Gerard D Schellenberg
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Dennis W Dickson
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, Florida 32224, USA
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11
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Dobrowolski SF, Lyons-Weiler J, Spridik K, Biery A, Breck J, Vockley J, Yatsenko S, Sultana T. Altered DNA methylation in PAH deficient phenylketonuria. Mol Genet Metab 2015; 115:72-7. [PMID: 25990862 DOI: 10.1016/j.ymgme.2015.04.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 04/16/2015] [Accepted: 04/16/2015] [Indexed: 02/07/2023]
Abstract
While phenylalanine (PHE) is the toxic insult in phenylketonuria (PKU), mechanisms underlying PHE toxicity remain ill-defined. Altered DNA methylation in response to toxic exposures is well-recognized. DNA methylation patterns were assessed in blood and brain from PKU patients to determine if PHE toxicity impacts methylation. Methylome assessment, utilizing methylated DNA immunoprecipitation and paired-end sequencing, was performed in DNA obtained from brain tissue of classical PKU patients, leukocytes from poorly controlled PKU patients, leukocytes from well controlled PKU patients, and appropriate control tissues. In PKU brain tissue, expression analysis determined the impact of methylation on gene function. Differential methylation was observed in brain tissue of PKU patients and expression studies identified downstream impact on gene expression. Altered patterns of methylation were observed in leukocytes of well controlled and poorly controlled patients with more extensive methylation in patients with high PHE exposure. Differential methylation of noncoding RNA genes was extensive in patients with high PHE exposure but minimal in well controlled patients. Methylome repatterning leading to altered gene expression was present in brain tissue of PKU patients, suggesting a role in neuropathology. Aberrant methylation is observed in leukocytes of PKU patients and is influenced by PHE exposure. DNA methylation may provide a biomarker relating to historic PHE exposure.
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Affiliation(s)
- Steven F Dobrowolski
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States.
| | - James Lyons-Weiler
- Genomics and Proteomics Core Laboratories, University of Pittsburgh, 3343 Forbes Avenue, Pittsburgh, PA 15260, United States
| | - Kayla Spridik
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - Amy Biery
- Department of Pathology, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - Jane Breck
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - Jerry Vockley
- Department of Pediatrics, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, 4401 Penn Avenue, Pittsburgh, PA 15224, United States
| | - Svetlana Yatsenko
- Pittsburgh Cytogenetics Laboratory, Magee Women's Hospital, 300 Halket Street, Pittsburgh, PA 15213, United States
| | - Tamanna Sultana
- Genomics and Proteomics Core Laboratories, University of Pittsburgh, 3343 Forbes Avenue, Pittsburgh, PA 15260, United States
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12
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Kaushansky N, Ben-Nun A. DQB1*06:02-Associated Pathogenic Anti-Myelin Autoimmunity in Multiple Sclerosis-Like Disease: Potential Function of DQB1*06:02 as a Disease-Predisposing Allele. Front Oncol 2014; 4:280. [PMID: 25360418 PMCID: PMC4199271 DOI: 10.3389/fonc.2014.00280] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 09/29/2014] [Indexed: 12/20/2022] Open
Abstract
Susceptibility to multiple sclerosis (MS) has been linked mainly to the HLA-DRB1 locus, with the HLA-DR15 haplotype (DRB1*1501-DQA1*0102-DQB1*0602-DRB5*0101) dominating MS risk in Caucasians. Although genes in the HLA-II region, particularly DRB1*1501, DQA1*0102-DQB1*0602, are in tight linkage disequilibrium, genome-wide-association, and gene candidate studies identified the DRB1*15:01 allele as the primary risk factor in MS. Many genetic and immune-functional studies have indicated DRB1*15:01 as a primary risk factor in MS, while only some functional studies suggested a disease-modifying role for the DRB5*01 or DQB1*06 alleles. In this respect, the susceptibility of DRB1*15:01-transgenic (Tg) mice to myelin basic protein- or myelin oligodendrocyte glycoprotein-induced MS-like disease is consistent with primary contribution of DRB1*15:01 to HLA-DR15+ MS. The studies summarized here show that susceptibility to MS-like disease, induced in HLA-“humanized” mice by myelin oligodendrocytic basic protein or by the proteolipid protein, one of the most prominent encephalitogenic target antigens implicated in human MS, is determined by DQB1*06:02, rather than by the DRB1*15:01 allele. These findings not only offer a rationale for a potential role for DQB1*06:02 in predisposing susceptibility to MS, but also suggest a more complex and differential functional role for HLA-DR15 alleles, depending on the primary target myelin antigen. However, the conflict between these findings in HLA-Tg mice and the extensive genome-wide-association studies, which could not detect any significant effect from the DQB1*06:02 allele on MS risk, is rather puzzling. Functional analysis of MS PBLs for DQB1*06:02-associated anti-myelin autoimmunity may indicate whether or not DQB1*06:02 is associated with MS pathogenesis.
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Affiliation(s)
- Nathali Kaushansky
- Department of Immunology, The Weizmann Institute of Science , Rehovot , Israel
| | - Avraham Ben-Nun
- Department of Immunology, The Weizmann Institute of Science , Rehovot , Israel
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13
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Mitochondrial dysfunction in schizophrenia: an evolutionary perspective. Hum Genet 2014; 134:13-21. [PMID: 25312050 DOI: 10.1007/s00439-014-1491-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 09/26/2014] [Indexed: 10/24/2022]
Abstract
Schizophrenia (SCZ) is a severe psychiatric illness with a lifetime prevalence of 0.4 %. A disturbance of energy metabolism has been suggested as part of the etiopathogenesis of the disorder. Several lines of evidence have proposed a connection between etiopathogenesis of SCZ and human brain evolution, which was characterized by an increase in the energy requirement, demanding a co-evolution of the mitochondrial system. Mitochondria are key players in brain energy homeostasis and multiple lines of evidence suggest that the system is disrupted in SCZ. In this review, we will describe the current knowledge on pathways/system involved in the human brain evolution as well as the main theories regarding the evolutionary origin of SCZ. We will furthermore discuss the role of mitochondria in the context of brain energy metabolism and its role in the etiopathogenesis of SCZ. Understanding SCZ in the context of human brain evolution opens a new perspective to elucidate pathophysiological mechanisms involved in the origin and/or portions of the complex symptomatology of this severe mental disorder.
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14
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Ferrari R, Ryten M, Simone R, Trabzuni D, Nicolaou N, Nicolaou N, Hondhamuni G, Ramasamy A, Vandrovcova J, Weale ME, Lees AJ, Momeni P, Hardy J, de Silva R. Assessment of common variability and expression quantitative trait loci for genome-wide associations for progressive supranuclear palsy. Neurobiol Aging 2014; 35:1514.e1-12. [PMID: 24503276 PMCID: PMC4104112 DOI: 10.1016/j.neurobiolaging.2014.01.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/06/2014] [Accepted: 01/08/2014] [Indexed: 12/22/2022]
Abstract
Progressive supranuclear palsy is a rare parkinsonian disorder with characteristic neurofibrillary pathology consisting of hyperphosphorylated tau protein. Common variation defining the microtubule associated protein tau gene (MAPT) H1 haplotype strongly contributes to disease risk. A recent genome-wide association study (GWAS) revealed 3 novel risk loci on chromosomes 1, 2, and 3 that primarily implicate STX6, EIF2AK3, and MOBP, respectively. Genetic associations, however, rarely lead to direct identification of the relevant functional allele. More often, they are in linkage disequilibrium with the causative polymorphism(s) that could be a coding change or affect gene expression regulatory motifs. To identify any such changes, we sequenced all coding exons of those genes directly implicated by the associations in progressive supranuclear palsy cases and analyzed regional gene expression data from control brains to identify expression quantitative trait loci within 1 Mb of the risk loci. Although we did not find any coding variants underlying the associations, GWAS-associated single-nucleotide polymorphisms at these loci are in complete linkage disequilibrium with haplotypes that completely overlap with the respective genes. Although implication of EIF2AK3 and MOBP could not be fully assessed, we show that the GWAS single-nucleotide polymorphism rs1411478 (STX6) is a strong expression quantitative trait locus with significantly lower expression of STX6 in white matter in carriers of the risk allele.
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Affiliation(s)
- Raffaele Ferrari
- Laboratory of Neurogenetics, Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA; Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Mina Ryten
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Roberto Simone
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Daniah Trabzuni
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK; Department of Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
| | - Nayia Nicolaou
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Naiya Nicolaou
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Geshanthi Hondhamuni
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Adaikalavan Ramasamy
- Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK; Department of Medical and Molecular Genetics, King's College London, Guy's Hospital, London, UK
| | - Jana Vandrovcova
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | | | - Michael E Weale
- Department of Medical and Molecular Genetics, King's College London, Guy's Hospital, London, UK
| | - Andrew J Lees
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK
| | - Parastoo Momeni
- Laboratory of Neurogenetics, Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - John Hardy
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Rohan de Silva
- Reta Lila Weston Institute, UCL Institute of Neurology, London, UK; Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK.
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15
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Han H, Myllykoski M, Ruskamo S, Wang C, Kursula P. Myelin-specific proteins: a structurally diverse group of membrane-interacting molecules. Biofactors 2013; 39:233-41. [PMID: 23780694 DOI: 10.1002/biof.1076] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 11/15/2012] [Indexed: 12/15/2022]
Abstract
The myelin sheath is a multilayered membrane in the nervous system, which has unique biochemical properties. Myelin carries a set of specific high-abundance proteins, the structure and function of which are still poorly understood. The proteins of the myelin sheath are involved in a number of neurological diseases, including autoimmune diseases and inherited neuropathies. In this review, we briefly discuss the structural properties and functions of selected myelin-specific proteins (P0, myelin oligodendrocyte glycoprotein, myelin-associated glycoprotein, myelin basic protein, myelin-associated oligodendrocytic basic protein, P2, proteolipid protein, peripheral myelin protein of 22 kDa, 2',3'-cyclic nucleotide 3'-phosphodiesterase, and periaxin); such properties include, for example, interactions with lipid bilayers and the presence of large intrinsically disordered regions in some myelin proteins. A detailed understanding of myelin protein structure and function at the molecular level will be required to fully grasp their physiological roles in the myelin sheath.
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Affiliation(s)
- Huijong Han
- Department of Biochemistry and Biocenter Oulu, University of Oulu, Oulu, Finland
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16
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Pfrieger FW, Slezak M. Genetic approaches to study glial cells in the rodent brain. Glia 2011; 60:681-701. [PMID: 22162024 DOI: 10.1002/glia.22283] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Accepted: 11/18/2011] [Indexed: 01/02/2023]
Abstract
The development, function, and pathology of the brain depend on interactions of neurons and different types of glial cells, namely astrocytes, oligodendrocytes, microglia, and ependymal cells. Understanding neuron-glia interactions in vivo requires dedicated experimental approaches to manipulate each cell type independently. In this review, we first summarize techniques that allow for cell-specific gene modification including targeted mutagenesis and viral transduction. In the second part, we describe the genetic models that allow to target the main glial cell types in the central nervous system. The existing arsenal of approaches to study glial cells in vivo and its expansion in the future are key to understand neuron-glia interactions under normal and pathologic conditions.
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Affiliation(s)
- Frank W Pfrieger
- CNRS UPR 3212, University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI), 67084 Strasbourg, France.
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17
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Laursen KB, Wong PM, Gudas LJ. Epigenetic regulation by RARα maintains ligand-independent transcriptional activity. Nucleic Acids Res 2011; 40:102-15. [PMID: 21911359 PMCID: PMC3245912 DOI: 10.1093/nar/gkr637] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Retinoic acid receptors (RARs) α, β and γ are key regulators of embryonic development. Hematopoietic differentiation is regulated by RARα, and several types of leukemia show aberrant RARα activity. Through microarray expression analysis, we identified transcripts differentially expressed between F9 wild-type (Wt) and RARα knockout cells cultured in the absence or presence of the RAR-specific ligand all trans retinoic acid (RA). We validated the decreased Mest, Tex13, Gab1, Bcl11a, Tcfap2a and HMGcs1 transcript levels, and increased Slc38a4, Stmn2, RpL39l, Ref2L, Mobp and Rlf1 transcript levels in the RARa knockout cells. The decreased Mest and Tex13 transcript levels were associated with increased promoter CpG-island methylation and increased repressive histone modifications (H3K9me3) in RARα knockout cells. Increased Slc38a4 and Stmn2 transcript levels were associated with decreased promoter CpG-island methylation and increased permissive histone modifications (H3K9/K14ac, H3K4me3) in RARα knockout cells. We demonstrated specific association of RARα and RXRα with the Mest promoter. Importantly, stable expression of a dominant negative, oncogenic PML–RARα fusion protein in F9 Wt cells recapitulated the decreased Mest transcript levels observed in RARα knockout cells. We propose that RARα plays an important role in cellular memory and imprinting by regulating the CpG methylation status of specific promoter regions.
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Affiliation(s)
- Kristian B Laursen
- Pharmacology Department of Weill Cornell Medical College of Cornell University, NY 10065, USA
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18
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Myllykoski M, Baumgärtel P, Kursula P. Conformations of peptides derived from myelin-specific proteins in membrane-mimetic conditions probed by synchrotron radiation CD spectroscopy. Amino Acids 2011; 42:1467-74. [PMID: 21505824 DOI: 10.1007/s00726-011-0911-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 04/02/2011] [Indexed: 12/22/2022]
Abstract
Myelin is a tightly packed membrane multilayer in the nervous system, which harbours a specific set of quantitatively major proteins. All these proteins interact with the lipid bilayer, being either peripheral or integral membrane proteins. In this study, we examined the conformational properties of peptides from the myelin proteins P0, CNPase, MOBP, P2 and MOG, using trifluoroethanol and micelles of different detergents as membrane-like mimics. The peptides showed significant differences in their folding under the employed conditions, as evidenced by synchrotron radiation circular dichroism spectroscopy. Our experiments provide new structural information on the interactions between myelin proteins and membranes, using a simplified model system of synthetic peptides and micelles.
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19
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Lin K, Chen K, Lan K, Lee H, Lai S. Alterations of myelin proteins in inflammatory demyelination of BALB/c mice caused by Angiostrongylus cantonensis. Vet Parasitol 2010; 171:74-80. [DOI: 10.1016/j.vetpar.2010.03.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 03/08/2010] [Accepted: 03/08/2010] [Indexed: 11/16/2022]
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20
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Hiraoka S, Kajii Y, Kuroda Y, Umino A, Nishikawa T. The development- and phencyclidine-regulated induction of synapse-associated protein-97 gene in the rat neocortex. Eur Neuropsychopharmacol 2010; 20:176-86. [PMID: 19836928 DOI: 10.1016/j.euroneuro.2009.08.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Revised: 07/15/2009] [Accepted: 08/28/2009] [Indexed: 11/28/2022]
Abstract
Using the RNA arbitrarily-primed PCR and the competitive RT-PCR, we have isolated the neocortical transcripts that are upregulated and unchanged in the adult and infant rats, respectively, after a systemic injection of an N-methyl-d-aspartate (NMDA) receptor antagonist phencyclidine (PCP), and found them identical to the synapse-associated protein-97 (SAP97) gene mRNAs. The upregulation of the SAP97 transcripts in the adult neocortex after the acute PCP injection was mimicked by another NMDA antagonist, dizocilpine, but not by the indirect dopamine agonists, methamphetamine and cocaine, a selective D1 receptor antagonist SCH23390, a D2 receptor-preferring antagonist haloperidol and a GABAergic anesthetic pentobarbital. Moreover, the pretreatment with a typical antipsychotic haloperidol failed to antagonize the increased neocortical SAP97 gene expression by PCP. These findings suggest that SAP97 might be involved in the molecular basis of the development-dependent onset of the non-dopaminergic symptoms seen in schizophrenia and the schizophrenia-like psychosis induced by NMDA receptor blocking.
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Affiliation(s)
- Shuichi Hiraoka
- Section of Psychiatry and Behavioral Science, Tokyo Medical and Dental University Graduate School, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
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21
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Kaushansky N, Eisenstein M, Zilkha-Falb R, Ben-Nun A. The myelin-associated oligodendrocytic basic protein (MOBP) as a relevant primary target autoantigen in multiple sclerosis. Autoimmun Rev 2009; 9:233-6. [PMID: 19683076 DOI: 10.1016/j.autrev.2009.08.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Accepted: 08/02/2009] [Indexed: 10/20/2022]
Abstract
Multiple sclerosis (MS) is a disease of the human CNS, characterized by perivascular inflammation, demyelination and axonal damage. Although the etiology of MS is unknown, it is believed that the disease results from destructive autoimmune mechanisms, presumably initiated by abnormal activation of potentially pathogenic autoimmune T-cells recognizing CNS components. The myelin-associated oligodendrocyte basic protein (MOBP), a relatively abundant CNS-specific myelin protein, which plays a role in stabilizing the myelin sheath in the CNS, has recently been implicated in the pathogenesis of MS. Here we review studies showing that MOBP is as an important candidate target antigen in MS as the other widely studied target antigens, myelin basic protein (MBP), proteolipid protein (PLP), and myelin oligodendrocyte glycoprotein (MOG). The studies summarized below indicate that T-cell autoimmunity against MOBP can be detected in MS patients; T-cells reactive against MOBP can be pathogenic in several mouse strains as well as in the "humanized" HLA-DR15-Tg mice; and, that the HLA-DQ6-restricted, but not HLA-DR15-restricted, MOBP-reactive T-cells cause in HLA-DR15-Tg mice MS-like clinical disease associated with perivascular and parenchymal infiltration, demyelination, axonal loss, and optic neuritis. Accordingly, the MOBP should be considered a bona fide primary target antigen in MS, in addition to MBP, PLP, and MOG.
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Affiliation(s)
- Nathali Kaushansky
- Department of Immunology, The Weizmann Institute of Science, P.O. Box 26, Rehovot 76000, Israel
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22
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Kaushansky N, Altmann DM, Ascough S, David CS, Lassmann H, Ben-Nun A. HLA-DQB1*0602 Determines Disease Susceptibility in a New “Humanized” Multiple Sclerosis Model in HLA-DR15 (DRB1*1501;DQB1*0602) Transgenic Mice. THE JOURNAL OF IMMUNOLOGY 2009; 183:3531-41. [DOI: 10.4049/jimmunol.0900784] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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23
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Zhang X, Chow CY, Sahenk Z, Shy ME, Meisler MH, Li J. Mutation of FIG4 causes a rapidly progressive, asymmetric neuronal degeneration. ACTA ACUST UNITED AC 2008; 131:1990-2001. [PMID: 18556664 DOI: 10.1093/brain/awn114] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Recessive Charcot-Marie-Tooth disease type-4J (CMT4J) and its animal model, the pale tremor mouse (plt), are caused by mutations of the FIG4 gene encoding a PI(3,5)P(2) 5-phosphatase. We describe the 9-year clinical course of CMT4J, including asymmetric, rapidly progressive paralysis, in two siblings. Sensory symptoms were absent despite reduced numbers of sensory axons. Thus, the phenotypic presentation of CMT4J clinically resembles motor neuron disease. Time-lapse imaging of fibroblasts from CMT4J patients demonstrates impaired trafficking of intracellular organelles because of obstruction by vacuoles. Further characterization of plt mice identified axonal degeneration in motor and sensory neurons, limited segmental demyelination, lack of TUNEL staining and lack of accumulation of ubiquitinated protein in vacuoles of motor and sensory neurons. This study represents the first documentation of the natural history of CMT4J. Physical obstruction of organelle trafficking by vacuoles is a potential novel cellular mechanism of neurodegeneration.
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Affiliation(s)
- Xuebao Zhang
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI 48201, USA
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Maier O, Hoekstra D, Baron W. Polarity Development in Oligodendrocytes: Sorting and Trafficking of Myelin Components. J Mol Neurosci 2008; 35:35-53. [DOI: 10.1007/s12031-007-9024-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2007] [Accepted: 11/13/2007] [Indexed: 12/15/2022]
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25
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Kaushansky N, Zilkha-Falb R, Hemo R, Lassman H, Eisenstein M, Sas A, Ben-Nun A. Pathogenic T cells in MOBP-induced murine EAE are predominantly focused to recognition of MOBP21F and MOBP27P epitopic residues. Eur J Immunol 2007; 37:3281-92. [DOI: 10.1002/eji.200737438] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Aruga J, Yoshikawa F, Nozaki Y, Sakaki Y, Toyoda A, Furuichi T. An oligodendrocyte enhancer in a phylogenetically conserved intron region of the mammalian myelin gene Opalin. J Neurochem 2007; 102:1533-1547. [PMID: 17442045 DOI: 10.1111/j.1471-4159.2007.04583.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Opalin is a transmembrane protein detected specifically in mammalian oligodendrocytes. Opalin homologs are found only in mammals and not in the genome sequences of other animal classes. We first determined the nucleotide sequences of Opalin orthologs and their flanking regions derived from four prosimians, a group of primitive primates. A global comparison revealed that an evolutionarily conserved region exists in the first intron of Opalin. When the conserved domain was assayed for its enhancer activity in transgenic mice, oligodendrocyte-directed expression was observed. In an oligodendroglial cell line, Oli-neu, the conserved domain showed oligodendrocyte-directed expression. The conserved domain is composed of eight subdomains, some of which contain binding sites for Myt1 and cAMP-response element binding protein (CREB). Deletion analysis and cotransfection experiments revealed that the subdomains have critical roles in Opalin gene expression. Over-expression of Myt1, treatment of the cell with leukemia inhibitory factor (LIF), and cAMP analog (CREB activator) enhanced the expression of endogenous Opalin in Oli-neu cells and activated the oligodendrocyte enhancer. These results suggest that LIF, cAMP signaling cascades and Myt1 play significant roles in the differentiation of oligodendrocytes through their action on the Opalin oligodendrocyte enhancer.
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Affiliation(s)
- Jun Aruga
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
| | - Fumio Yoshikawa
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
| | - Yayoi Nozaki
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
| | - Yoshiyuki Sakaki
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
| | - Atsushi Toyoda
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
| | - Teiichi Furuichi
- Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanLaboratory for Molecular Neurogenesis, RIKEN Brain Science Institute, Wako-shi, Saitama, JapanSequence Technology Team, RIKEN Genomic Science Center, Yokohama, Japan
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27
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Kursula P. Structural properties of proteins specific to the myelin sheath. Amino Acids 2006; 34:175-85. [PMID: 17177074 DOI: 10.1007/s00726-006-0479-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2006] [Accepted: 11/13/2006] [Indexed: 12/15/2022]
Abstract
The myelin sheath is an insulating membrane layer surrounding myelinated axons in vertebrates, which is formed when the plasma membrane of an oligodendrocyte or a Schwann cell wraps itself around the axon. A large fraction of the total protein in this membrane layer is comprised of only a small number of individual proteins, which have certain intriguing structural properties. The myelin proteins are implicated in a number of neurological diseases, including, for example, autoimmune diseases and peripheral neuropathies. In this review, the structural properties of a number of myelin-specific proteins are described.
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Affiliation(s)
- P Kursula
- Department of Biochemistry, University of Oulu, Oulu, Finland.
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28
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Montague P, McCallion AS, Davies RW, Griffiths IR. Myelin-associated oligodendrocytic basic protein: a family of abundant CNS myelin proteins in search of a function. Dev Neurosci 2006; 28:479-87. [PMID: 17028425 DOI: 10.1159/000095110] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Accepted: 08/27/2005] [Indexed: 12/19/2022] Open
Abstract
The myelin-associated oligodendrocytic basic protein (MOBP) family constitutes the third most abundant protein in CNS myelin. The mouse Mobp gene comprises eight exons. Mobp pre-mRNA processing gives rise to at least seven Mobp splice variants which are expressed solely in the oligodendrocyte. The predicted proteins all, with one exception, share a 68 residue amino terminus, encoded by exon 3. The carboxyl termini differ in length, giving rise to the diverse array of the protein isoforms. Like myelin basic protein, MOBP is present in the major dense line of CNS myelin suggesting a role in the compaction or stabilization of myelin. However, Mobp homozygous null mice display no overt clinical phenotype and no defect in the process of myelination. MOBP can induce experimental allergic encephalomyelitis in mice and has been proposed to have a role in the pathogenesis of multiple sclerosis. Despite 10 years of rigorous study, the normal physiological function of MOBP remains unknown.
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MESH Headings
- Animals
- Central Nervous System/metabolism
- Central Nervous System/ultrastructure
- Disease Models, Animal
- Encephalomyelitis, Autoimmune, Experimental/genetics
- Encephalomyelitis, Autoimmune, Experimental/metabolism
- Encephalomyelitis, Autoimmune, Experimental/physiopathology
- Humans
- Mice
- Mice, Knockout/genetics
- Mice, Knockout/metabolism
- Multiple Sclerosis/genetics
- Multiple Sclerosis/metabolism
- Multiple Sclerosis/physiopathology
- Myelin Proteins
- Myelin Sheath/metabolism
- Myelin Sheath/ultrastructure
- Myelin-Associated Glycoprotein/chemistry
- Myelin-Associated Glycoprotein/genetics
- Myelin-Associated Glycoprotein/metabolism
- Myelin-Oligodendrocyte Glycoprotein
- Protein Isoforms/chemistry
- Protein Isoforms/genetics
- Protein Isoforms/metabolism
- Protein Structure, Tertiary/genetics
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Affiliation(s)
- Paul Montague
- Applied Neurobiology Group, Institute of Comparative Medicine, University of Glasgow Veterinary School, Glasgow, UK.
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29
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Abstract
Dys- and demyelination are the common endpoints of several inherited diseases of glial cells, which elaborate myelin and which maintain the myelin sheath very much like an "external" cellular organelle. Whereas some of the genes that are affected by mutations appear to be glial-specific, other genes are expressed in many cell types but their defect is restricted to oligodendrocytes or Schwann cells. Many of the disease genes and their encoded proteins have been studied with the help of mouse models, and a number of different molecular pathomechanisms have emerged which have been summarized in Figure 8. Some of the new concepts in the field, which have been addressed in this review, have only emerged because similar pathomechanisms were discovered for different myelin proteins. Mouse models have clearly helped to address both, the molecular pathology of myelin diseases and the normal function of myelin genes, but as discussed in this review, these questions turned out to be very different. Despite the progress in understanding the role of the abundant myelin proteins, there also remain a number of open questions that concern, among other things, the initial axon-glia recognition, the assembly process of the myelin sheath, and the long-term interaction of axons with their myelinating glia. Finally, animal models of human neurological diseases should not be restricted to the study of pathology, but they should also contribute to the development of experimental treatments. It is encouraging that a few attempts have been made.
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Affiliation(s)
- H Werner
- Zentrum für Molekulare Biologie (ZMBH), Universität Heidelberg, Germany
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30
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Combi R, Ferini-Strambi L, Montruccoli A, Bianchi V, Malcovati M, Zucconi M, Dalprà L, Tenchini ML. Two new putative susceptibility loci for ADNFLE. Brain Res Bull 2005; 67:257-63. [PMID: 16182932 DOI: 10.1016/j.brainresbull.2005.06.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2005] [Revised: 05/16/2005] [Accepted: 06/03/2005] [Indexed: 11/30/2022]
Abstract
Autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE) has been up to now considered a simple Mendelian trait caused by mutations in neuronal nicotinic acetylcholine receptor (nAChR) subunit genes. We previously demonstrated that in a three-generation Italian family the disease was unlinked to all known ADNFLE loci as well as to all known brain-expressed nAChR subunits. The genome-wide linkage analysis here presented performed on this family points to the existence of two new putative ADNFLE loci on chromosomes 3p22-p24 and 8q11.2-q21.1. These findings, together with several ADNFLE characteristics, suggest that this epilepsy could be, at least in the above family, a complex disorder. In particular, we propose and discuss the hypothesis of a digenic transmission of the disease.
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Affiliation(s)
- Romina Combi
- Department of Biology and Genetics for Medical Sciences, University of Milano, Italy
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31
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Montague P, McCallion AS, Barrie JE, Edgar JM, McLaughlin M, Davies RW, Griffiths IR. Characterization of the murine splice variantMobp155: Developmental CNS expression pattern and subcellular localization of epitope-tagged protein. Glia 2005; 50:80-5. [PMID: 15625715 DOI: 10.1002/glia.20155] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Members of the myelin-associated oligodendrocytic basic protein (MOBP) family constitute the third most abundant protein in CNS myelin. Although MOBP localizes to the major dense line (MDL) of CNS myelin, the function of the individual isoforms is unknown. Alternative splicing of pre-Mobp mRNA gives rise to six characterized splice variants in both the mouse and the rat. These splice variants share a common N-terminal encoded in Mobp exon 3 comprising 68 amino acids. The predicted protein isoforms differ in their C-termini. Sequence analysis of intron 3 revealed the presence of a putative initiation codon followed by an open reading frame (ORF) encoding 53 amino acids that extends in frame into Mobp exon 4 yielding a predicted MOBP isoform comprising 155 amino acids, designated MOBP155. This newly characterized isoform possessing a novel N-terminus shares a common C-terminus with MOBP170. Mobp170 message is detectable at low abundance throughout myelinogenesis. In contrast, the novel splice variant encoding MOBP155 is expressed at modest levels late in CNS development, coincident with the expression of the abundant splice variant, Mobp81A. Immunostaining of Cos7 cells transiently expressing an epitope-tagged MOBP155 suggested that most of the product was translocated to mitochondria. Although Mobp155 and Mobp170 encode a common predicted C-terminus they have different expression profiles and their products are targeted to mitochondria and the nucleus, respectively, in transiently transfected Cos7 cells.
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Affiliation(s)
- Paul Montague
- Applied Neurobiology Group, Institute of Comparative Medicine, University of Glasgow Veterinary School, Glasgow, Scotland, United Kingdom
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32
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de Rosbo NK, Kaye JF, Eisenstein M, Mendel I, Hoeftberger R, Lassmann H, Milo R, Ben-Nun A. The Myelin-Associated Oligodendrocytic Basic Protein Region MOBP15–36 Encompasses the Immunodominant Major Encephalitogenic Epitope(s) for SJL/J Mice and Predicted Epitope(s) for Multiple Sclerosis-Associated HLA-DRB1*1501. THE JOURNAL OF IMMUNOLOGY 2004; 173:1426-35. [PMID: 15240739 DOI: 10.4049/jimmunol.173.2.1426] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Autoimmune response to the myelin-associated oligodendrocytic basic protein (MOBP), a CNS-specific myelin constituent, was recently suggested to play a role in the pathogenesis of multiple sclerosis (MS). The pathogenic autoimmune response to MOBP and the associated pathology in the CNS have not yet been fully investigated. In this study, we have characterized the clinical manifestations, pathology, T cell epitope-specificity, and TCRs associated with experimental autoimmune encephalomyelitis (EAE) induced in SJL/J mice with recombinant mouse MOBP (long isoform, 170 aa). Analysis of encephalitogenic MOBP-reactive T cells for reactivity to overlapping MOBP peptides defined MOBP15-36 as their major immunodominant epitope. Accordingly, MOBP15-36 was demonstrated to be the major encephalitogenic MOBP epitope for SJL/J mice, inducing severe/chronic clinical EAE associated with intense perivascular and parenchymal infiltrations, widespread demyelination, axonal loss, and remarkable optic neuritis. Molecular modeling of the interaction of I-A(s) with MOBP15-36, together with analysis of the MOBP15-36-specific T cell response to truncated peptides, suggests MOBP20-28 as the core sequence for I-A(s)-restricted recognition of the encephalitogenic region MOBP15-36. Although highly focused in their epitope specificity, the encephalitogenic MOBP-reactive T cells displayed a widespread usage of TCR Vbeta genes. These results would therefore favor epitope-directed, rather than TCR-targeted, approaches to therapy of MOBP-associated pathogenic autoimmunity. Localization by molecular modeling of a potential HLA-DRB1*1501-associated MOBP epitope within the encephalitogenic MOBP15-36 sequence suggests the potential relevance of T cell reactivity against MOBP15-36 to MS. The reactivity to MOBP15-36 detected in MS shown here and in another study further emphasizes the potential significance of this epitope for MS.
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33
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Crawford MP, Yan SX, Ortega SB, Mehta RS, Hewitt RE, Price DA, Stastny P, Douek DC, Koup RA, Racke MK, Karandikar NJ. High prevalence of autoreactive, neuroantigen-specific CD8+ T cells in multiple sclerosis revealed by novel flow cytometric assay. Blood 2004; 103:4222-31. [PMID: 14976054 DOI: 10.1182/blood-2003-11-4025] [Citation(s) in RCA: 197] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Multiple sclerosis (MS) is an inflammatory, demyelinating disease of the central nervous system (CNS) with features suggestive of T-cell-mediated pathology. Most prior reports have focused on CD4(+) T cells with the underlying assumption that MS is predominantly a CD4(+) T helper 1 (Th1)-mediated disease. In this report, we used a novel flow cytometric approach to evaluate autoreactive T-cell responses against a large variety of neuroantigenic targets. We found that both CD4(+) and CD8(+) T cells targeted against several CNS autoantigens were widely prevalent in patients with MS and healthy individuals. Whereas the distribution of CD4(+) responses was similar in different groups, patients with relapsing-remitting MS showed a higher proportion of CNS-specific CD8(+) responses. Autoreactive CD4(+) T cells from patients with MS exhibited a more differentiated Th1 phenotype compared with healthy subjects. Similarly, CNS-specific CD8(+) T-cell responses from patients with MS were functionally distinct from those in healthy individuals. Collectively, these studies reveal the high prevalence of class I-restricted autoreactive CD8(+) T-cell responses in MS that has been underappreciated thus far. The results emphasize the need to evaluate both CD4(+) and CD8(+) T-cell responses in MS and to make both subsets a consideration in the development of novel therapeutic strategies.
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Affiliation(s)
- Michael P Crawford
- Department of Pathology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9072, USA
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34
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Kadota K, Nishimura SI, Bono H, Nakamura S, Hayashizaki Y, Okazaki Y, Takahashi K. Detection of genes with tissue-specific expression patterns using Akaike's information criterion procedure. Physiol Genomics 2003; 12:251-9. [PMID: 12499447 DOI: 10.1152/physiolgenomics.00153.2002] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We applied a method based on Akaike's information criterion (AIC) to detect genes whose expression profile is considerably different in some tissue(s) than in others. Such observations are detected as outliers, and the method we used was originally developed to detect outliers. The main advantage of the method is that objective decisions are possible because the procedure is independent of a significance level. We applied the method to 48 expression ratios corresponding to various tissues in each of 14,610 clones obtained from the RIKEN Expression Array Database (READ; http://read.gsc.riken.go.jp). As a result, for several tissues (e.g., muscle, heart, and tongue tissues that contain similar cell types) we objectively obtained specific clones without any "thresholding." Our study demonstrates the feasibility of the method for detecting tissue-specific gene expression patterns.
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Affiliation(s)
- Koji Kadota
- Computational Biology Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo 135-0064 Japan
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35
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Abstract
An autoimmune response to one or more myelin-protein components is thought to be part of the pathogenesis of multiple sclerosis (MS). The immunodominant-autoantibody epitope may be localized on a linear peptide segment, on a conformation-sensitive epitope, or on an epitope resulting from post-translational modifications. Primary, secondary, and tertiary structures of myelin proteins may determine the specific site for binding of autoantibodies. A myelin protein-specific autoantibody can bind to either a linear or conformational epitope, whereas all of the T cell epitopes are linear. At present, the conformational epitopes of myelin proteins have not been identified; most of the methods used to identify the myelin-protein epitopes corresponding to the pathogenesis of multiple sclerosis are involved in the linear epitope mapping. Polymorphism or mutations may cause inappropriate expression of the myelin proteins with alterations to their linear and/or conformational epitopes, and make them susceptible to autoantibody binding, especially if these changes occur at the surface of the protein. This review focuses on the specificity of autoantibodies to the epitopes of myelin proteins and correlates this to the structures of proteins. Factors that influence the expression of myelin-protein epitopes such as the alpha-helical or beta-sheet structure of the protein, the tri-proline site, and the post-translational modifications as well as physicochemical properties of amino acid changed are included.
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Affiliation(s)
- Permphan Dharmasaroja
- Faculty of Science, Department of Anatomy, Mahidol University, 272 Rama VI Road, Rajthevi, Bangkok 10400, Thailand.
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36
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Yool D, Montague P, McLaughlin M, McCulloch MC, Edgar JM, Nave KA, Davies RW, Griffiths IR, McCallion AS. Phenotypic analysis of mice deficient in the major myelin protein MOBP, and evidence for a novel Mobp isoform. Glia 2002; 39:256-67. [PMID: 12203392 DOI: 10.1002/glia.10103] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Myelin-associated oligodendrocytic basic protein (MOBP) is a recently identified major component of central nervous system (CNS) myelin. We previously reported a detailed characterization of the genomic region encompassing the Mobp gene, elucidating the complex series of transcript splicing responsible for the generation of its diverse family of protein isoforms. These basic, positively charged polypeptides display spatial and temporal expression patterns consistent with a potential role in the compaction and maintenance of the myelin sheath. MOBP isoforms have also been localized to the nucleus and the microtubular network of oligodendrocytes; transcript corresponding to one isoform is present during embryonic development. Recent reports have identified a role for this protein family in the pathogenesis of multiple sclerosis, but a clear function for the wild-type protein has remained unclear. We report a detailed analysis of a targeted mutation of Mobp, which results in the deletion of the translational start site and most of the coding sequence of MOBP, and the deletion of the entire coding sequence corresponding to a novel, putative MOBP isoform. Our analyses clearly demonstrate that MOBP-deficient mice develop normally, generate intact compact CNS myelin, and demonstrate no obvious clinical phenotype. Furthermore, in contrast with another recent study, we find that Mobp null mice demonstrate no significant influence on the axonal diameter of myelinated axons. Although MOBP is not essential for myelination, it appears that its absence is not simply compensated for by increased expression of the "classic" myelin basic protein (MBP).
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Affiliation(s)
- D Yool
- Applied Neurobiology Group, Institute of Comparative Medicine, University of Glasgow Veterinary School, Glasgow, Scotland, United Kingdom
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37
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Jurevics H, Largent C, Hostettler J, Sammond DW, Matsushima GK, Kleindienst A, Toews AD, Morell P. Alterations in metabolism and gene expression in brain regions during cuprizone-induced demyelination and remyelination. J Neurochem 2002; 82:126-36. [PMID: 12091473 DOI: 10.1046/j.1471-4159.2002.00954.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Exposure of mice to the copper chelator, cuprizone, results in CNS demyelination. There is remyelination after removal of the metabolic insult. We present brain regional studies identifying corpus callosum as particularly severely affected; 65% of cerebroside is lost after 6 weeks of exposure. We examined recovery of cerebroside and ability to synthesize cerebroside and cholesterol following removal of the toxicant. The temporal pattern for concentration of myelin basic protein resembled that of cerebroside. We applied Affymetrix GeneChip technology to corpus callosum to identify temporal changes in levels of mRNAs during demyelination and remyelination. Genes coding for myelin structural components were greatly down-regulated during demyelination and up-regulated during remyelination. Genes related to microglia/macrophages appeared in a time-course (peaking at 6 weeks) correlating with phagocytosis of myelin and repair of lesions. mRNAs coding for many cytokines had peak expression at 4 weeks, compatible with intercellular signaling roles. Of interest were other genes with temporal patterns correlating with one of the three above patterns, but of function not obviously related to demyelination/remyelination. The ability to correlate gene expression with known pathophysiological events should help in elucidating further function of such genes as related to demyelination/remyelination.
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Affiliation(s)
- Helga Jurevics
- Neuroscience Center, Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC 27599-7250, USA
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38
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Affiliation(s)
- A van der Goes
- Department of Cell Biology and Immunology, Faculty of Medicine, Vrije Universiteit, Van den Boechorststraat 7, 1081 BT Amsterdam, The Netherlands
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39
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Baumann N, Pham-Dinh D. Biology of oligodendrocyte and myelin in the mammalian central nervous system. Physiol Rev 2001; 81:871-927. [PMID: 11274346 DOI: 10.1152/physrev.2001.81.2.871] [Citation(s) in RCA: 1203] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Oligodendrocytes, the myelin-forming cells of the central nervous system (CNS), and astrocytes constitute macroglia. This review deals with the recent progress related to the origin and differentiation of the oligodendrocytes, their relationships to other neural cells, and functional neuroglial interactions under physiological conditions and in demyelinating diseases. One of the problems in studies of the CNS is to find components, i.e., markers, for the identification of the different cells, in intact tissues or cultures. In recent years, specific biochemical, immunological, and molecular markers have been identified. Many components specific to differentiating oligodendrocytes and to myelin are now available to aid their study. Transgenic mice and spontaneous mutants have led to a better understanding of the targets of specific dys- or demyelinating diseases. The best examples are the studies concerning the effects of the mutations affecting the most abundant protein in the central nervous myelin, the proteolipid protein, which lead to dysmyelinating diseases in animals and human (jimpy mutation and Pelizaeus-Merzbacher disease or spastic paraplegia, respectively). Oligodendrocytes, as astrocytes, are able to respond to changes in the cellular and extracellular environment, possibly in relation to a glial network. There is also a remarkable plasticity of the oligodendrocyte lineage, even in the adult with a certain potentiality for myelin repair after experimental demyelination or human diseases.
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Affiliation(s)
- N Baumann
- Institut National de la Santé et de la Recherche Médicale U. 495, Biology of Neuron-Glia Interactions, Salpêtrière Hospital, Paris, France.
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40
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Abstract
The targeting of mRNAs to specific subcellular locations is believed to facilitate the rapid and selective incorporation of their protein products into complexes that may include membrane organelles. In oligodendrocytes, mRNAs that encode myelin basic protein (MBP) and select myelin-associated oligodendrocytic basic proteins (MOBPs) locate in myelin sheath assembly sites (MSAS). To identify additional mRNAs located in MSAS, we used a combination of subcellular fractionation and suppression subtractive hybridization. More than 50% of the 1,080 cDNAs that were analyzed were derived from MBP or MOBP mRNAs, confirming that the method selected mRNAs enriched in MSAS. Of 90 other cDNAs identified, most represent one or more mRNAs enriched in rat brain myelin. Five cDNAs, which encode known proteins, were characterized for mRNA size(s), enrichment in myelin, and tissue and developmental expression patterns. Two of these, peptidylarginine deiminase and ferritin heavy chain, have recognized roles in myelination. The corresponding mRNAs were of different sizes than the previously identified mRNA, and they had tissue and development expression patterns that were indistinguishable from those of MBP mRNA. Three other cDNAs recognize mRNAs whose proteins (SH3p13, KIF1A, and dynein light intermediate chain) are involved in membrane biogenesis. Although enriched in myelin, the tissue and developmental distribution patterns of these mRNAs differed from those of MBP mRNA. Six other cDNAs, which did not share significant sequence homology to known mRNAs, were also examined. The corresponding mRNAs were highly enriched in myelin, and four had tissue and developmental distribution patterns indistinguishable from those of MBP mRNA. These studies demonstrate that MSAS contain a diverse population of mRNAs, whose locally synthesized proteins are placed to contribute to myelin sheath assembly and maintenance. Characterization of these mRNAs and proteins will help provide a comprehensive picture of myelin sheath assembly.
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Affiliation(s)
- R M Gould
- Department of Pharmacology, NYS Institute for Basic Research in Developmental Disabilities, Staten Island, New York 10314, USA.
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41
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Sadahiro S, Yoshikawa H, Yagi N, Yamamoto Y, Yanagihara T, Kimura M, Sakoda S. Morphometric analysis of the myelin-associated oligodendrocytic basic protein-deficient mouse reveals a possible role for myelin-associated oligodendrocytic basic protein in regulating axonal diameter. Neuroscience 2000; 98:361-7. [PMID: 10854769 DOI: 10.1016/s0306-4522(00)00111-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Myelin-associated oligodendrocytic basic protein is a member of the proteins constituting the central nervous system myelin. By morphometric analysis, we demonstrated that axons of myelin-associated oligodendrocytic basic protein-deficient mice had larger diameters and more myelin lamellae as compared to those of wild-type mice at the same age. It is known that the number of myelin lamellae increases linearly with axonal diameter, and that the rate of radial axonal growth is the factor controlling the rate of myelin formation. In line with these observations, we found that the regression line for axonal diameter and the number of myelin lamellae in myelin-associated oligodendrocytic basic protein-deficient mice appeared to be identical to that in wild-type mice, indicating that the increase in the number of myelin lamellae was the result of the increase in axonal diameter. Furthermore, we generated myelin basic protein/myelin-associated oligodendrocytic basic protein-double-deficient mice through mating myelin-associated oligodendrocytic basic protein-deficient mice with shiverer mice, an autosomal recessive mutant characterized by a lack of all isoforms of myelin basic protein. With these knock-out mice, we showed that axons of the double-deficient mice had larger diameters and smaller form factor, an index of the deformation of the fiber contour, in ensheathed fibers than those of shiverer mice, although there was no difference in axonal diameter of unmyelinated fibers between them. Taken together, myelin-associated oligodendrocytic basic protein seemed to play a role in controlling axonal diameter and in keeping axons round.
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Affiliation(s)
- S Sadahiro
- Department of Neurology (D-4), Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, 565-0871, Osaka, Japan
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42
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Frank M. MAL, a proteolipid in glycosphingolipid enriched domains: functional implications in myelin and beyond. Prog Neurobiol 2000; 60:531-44. [PMID: 10739088 DOI: 10.1016/s0301-0082(99)00039-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The myelin and lymphocyte protein MAL (VIP17/MVP17) is a proteolipid of 17 kD with a hydrophobicity pattern that indicates a four transmembrane domain structure. The MAL cDNA has been cloned from human T-cells, rat oligodendrocytes and the Madin-Darby canine kidney (MDCK) cell line. In the nervous system both myelinating cells, oligodendrocytes and Schwann cells, express MAL protein. MAL expression parallels myelin formation, and MAL is predominantly localized in compact myelin. Prior to myelin formation MAL is also found in immature Schwann cells. Outside the nervous system MAL expression is found in T-cells and in distinct epithelial cells, e.g. in kidney, stomach and thyroid gland, where MAL is localised in the apical plasma membrane. Specific glycosphingolipids, e.g. galactosylceramide and sulfatide, are enriched in such apical kidney and stomach membranes as well as in myelin. MAL copurifies with these glycosphingolipids in detergent insoluble domains, indicating a close association and possible functional interactions of MAL with glycosphingolipids in these tissues. Moreover, recent reports point to additional functions of MAL-glycosphingolipid complexes in signalling, cell differentiation and apical sorting. The role of MAL in the formation, stabilisation and maintenance of glycosphingolipid-enriched membrane microdomains and its contribution to specific membrane properties in myelin and epithelial cells are discussed.
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Affiliation(s)
- M Frank
- Brain Research Institute, Department of Neuromorphology, University of Zurich, Switzerland.
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43
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Hirst EM, Johnson TC, Li Y, Raisman G. Improved post-embedding immunocytochemistry of myelinated nervous tissue for electron microscopy. J Neurosci Methods 2000; 95:151-8. [PMID: 10752486 DOI: 10.1016/s0165-0270(99)00173-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The particularly high lipid content of normal mature adult myelin sheaths, together with the light fixation protocols usually necessary to retain antigenicity, combine to make white matter nervous tissue an especially problematical subject for post-embedding immuno-electron microscopy using modern acrylic resins. Fixation and infiltration modifications to standard processing schedules for Lowicryl were found to greatly improve the embedding and therefore the resulting morphology. This in turn improved the signal to noise ratio by reducing the high non-specific backgrounds usually found in poorly infiltrated areas. Using Lowicryl HM20, we have been able to obtain satisfactory immunostaining for myelin basic protein with good retention of structural integrity in the myelin of both normal and lesioned adult cortico spinal tract.
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Affiliation(s)
- E M Hirst
- Division of Neurobiology, National Institute for Medical Research, London, UK.
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44
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Kaye JF, Kerlero de Rosbo N, Mendel I, Flechter S, Hoffman M, Yust I, Ben-Nun A. The central nervous system-specific myelin oligodendrocytic basic protein (MOBP) is encephalitogenic and a potential target antigen in multiple sclerosis (MS). J Neuroimmunol 2000; 102:189-98. [PMID: 10636488 DOI: 10.1016/s0165-5728(99)00168-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Uncovering primary target antigens in multiple sclerosis (MS) is of major significance for understanding the etiology and pathophysiology of the disease, and for designing immunospecific therapy. In this study, a synthetic peptide representing a predicted T cell epitope on myelin oligodendrocytic basic protein (MOBP) was found to be encephalitogenic in C3H.SW mice, inducing experimental autoimmune encephalomyelitis with an abrupt onset. Two separate preliminary studies with MOBP peptides indicated that autoreactivity to MOBP occurs in MS. These data strongly suggest that MOBP is a highly relevant target in MS and further point to the complexity of antigen specificities in MS.
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Affiliation(s)
- J F Kaye
- Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel
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45
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Holz A, Bielekova B, Martin R, Oldstone MB. Myelin-associated oligodendrocytic basic protein: identification of an encephalitogenic epitope and association with multiple sclerosis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 164:1103-9. [PMID: 10623862 DOI: 10.4049/jimmunol.164.2.1103] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Myelin-associated oligodendrocytic basic protein (MOBP) is an abundant myelin constituent expressed exclusively by oligodendrocytes, the myelin-forming cells of the CNS. We report that MOBP causes experimental allergic encephalomyelitis and is associated with multiple sclerosis. First, we note that purified recombinant MOBP inoculated into SJL/J mice produces CNS disease. Tests of overlapping peptides spanning the murine MOBP molecule map the encephalitogenic site to amino acids 37-60. MOBP-induced experimental allergic encephalomyelitis shows a severe clinical course and is characterized by a prominent CD4+ T lymphocyte infiltration and a lesser presence of CD8+ T cells and microglia/macrophages around vessels and in the white matter of the CNS. Second, PBL obtained from patients with relapsing/remitting multiple sclerosis mount a proliferative response to human MOBP, especially at amino acids 21-39. This response equals or exceeds the response to myelin basic protein and an influenza virus hemagglutinin peptide, both serving as internal controls. Thus, a novel myelin Ag, MOBP aa 37-60, plays a role in rodent autoimmune CNS disease, and its human MOBP counterpart is associated with the human demyelinating disease multiple sclerosis.
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MESH Headings
- Amino Acid Sequence
- Animals
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/metabolism
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Epitopes, T-Lymphocyte/isolation & purification
- Humans
- Lymphocyte Activation/immunology
- Mice
- Mice, Inbred Strains
- Molecular Sequence Data
- Multiple Sclerosis/immunology
- Multiple Sclerosis/metabolism
- Multiple Sclerosis/pathology
- Myelin Proteins
- Myelin-Associated Glycoprotein/chemistry
- Myelin-Associated Glycoprotein/genetics
- Myelin-Associated Glycoprotein/immunology
- Myelin-Associated Glycoprotein/physiology
- Myelin-Oligodendrocyte Glycoprotein
- Peptide Fragments/immunology
- Rats
- Recombinant Fusion Proteins/immunology
- T-Lymphocytes/immunology
- T-Lymphocytes/pathology
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Affiliation(s)
- A Holz
- Viral-Immunobiology Laboratory, Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, La Jolla, CA 92037, USA.
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46
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Hemmer B, Gran B, Zhao Y, Marques A, Pascal J, Tzou A, Kondo T, Cortese I, Bielekova B, Straus SE, McFarland HF, Houghten R, Simon R, Pinilla C, Martin R. Identification of candidate T-cell epitopes and molecular mimics in chronic Lyme disease. Nat Med 1999; 5:1375-82. [PMID: 10581079 DOI: 10.1038/70946] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Elucidating the cellular immune response to infectious agents is a prerequisite for understanding disease pathogenesis and designing effective vaccines. In the identification of microbial T-cell epitopes, the availability of purified or recombinant bacterial proteins has been a chief limiting factor. In chronic infectious diseases such as Lyme disease, immune-mediated damage may add to the effects of direct infection by means of molecular mimicry to tissue autoantigens. Here, we describe a new method to effectively identify both microbial epitopes and candidate autoantigens. The approach combines data acquisition by positional scanning peptide combinatorial libraries and biometric data analysis by generation of scoring matrices. In a patient with chronic neuroborreliosis, we show that this strategy leads to the identification of potentially relevant T-cell targets derived from both Borrelia burgdorferi and the host. We also found that the antigen specificity of a single T-cell clone can be degenerate and yet the clone can preferentially recognize different peptides derived from the same organism, thus demonstrating that flexibility in T-cell recognition does not preclude specificity. This approach has potential applications in the identification of ligands in infectious diseases, tumors and autoimmune diseases.
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Affiliation(s)
- B Hemmer
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Building 10, Room 5B-16, 10 Center DR MSC 1400, Bethesda, Maryland 20892-1400, USA
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47
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Kerokoski P, Ilonen J, Gaedigk R, Dosch HM, Knip M, Hakala M, Hinkkanen A. Production of the islet cell antigen ICA69 (p69) with baculovirus expression system: analysis with a solid-phase time-resolved fluorescence method of sera from patients with IDDM and rheumatoid arthritis. Autoimmunity 1999; 29:281-9. [PMID: 10433084 DOI: 10.3109/08916939908994748] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Islet cell antigen 69 (ICA69), previously implicated as an autoantigen in autoimmune insulin-dependent diabetes mellitus (IDDM), was produced using baculovirus-mediated expression in Spodopterafrugiperda (Sf9) insect cells. In these cells the protein was effectively expressed and ICA69 carrying C-terminal histidine-hexapeptide could be efficiently purified using immobilized metal chelate affinity chromatography. Screening of patient and control sera using this protein as an antigen in time-resolved fluoroimmunoassay (TR-FIA) identified 4/50 of patients with IDDM and 6/73 of patients with rheumatoid arthritis (RA) to be positive for ICA69 antibodies. The number of positives did not differ significantly between patients and control subjects but the level of binding was higher in sera from RA patients compared to that of control sera (P = 0.003). The results show that some subjects have specific autoreactive antibodies against the ICA69 protein produced with recombinant technology.
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Affiliation(s)
- P Kerokoski
- Turku Immunology Centre and Department of Virology, University of Turku, Finland
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48
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Frank M, Schaeren-Wiemers N, Schneider R, Schwab ME. Developmental expression pattern of the myelin proteolipid MAL indicates different functions of MAL for immature Schwann cells and in a late step of CNS myelinogenesis. J Neurochem 1999; 73:587-97. [PMID: 10428054 DOI: 10.1046/j.1471-4159.1999.0730587.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The myelin and lymphocyte protein MAL is a small proteolipid of 17 kDa and is expressed by oligodendrocytes and Schwann cells. We have characterized the embryonic and postnatal expression of MAL in the rat nervous system by in situ hybridization, immunocytochemistry, and western blotting and compared it with that of other myelin constituents. In the CNS, MAL is expressed during late steps of myelination: MAL protein appears approximately 3-5 days later than myelin basic protein and proteolipid protein. In contrast, in the PNS, MAL transcript and protein expression is detected prior to the onset of myelination, as early as embryonic day 17. Our results demonstrate that MAL is differentially expressed in oligodendrocytes and Schwann cells, likely reflecting different functions of the MAL proteolipid: (1) The late expression of MAL protein in the CNS points to a role in the final steps of myelin sheath formation, such as stabilization of the compacted myelin membranes. (2) The early expression of MAL protein in immature Schwann cells suggests an important role of MAL in the terminal differentiation step of the Schwann cell lineage and in the onset of peripheral myelination.
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Affiliation(s)
- M Frank
- Brain Research Institute, University of Zurich, Switzerland
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49
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Yamamoto Y, Yoshikawa H, Nagano S, Kondoh G, Sadahiro S, Gotow T, Yanagihara T, Sakoda S. Myelin-associated oligodendrocytic basic protein is essential for normal arrangement of the radial component in central nervous system myelin. Eur J Neurosci 1999; 11:847-55. [PMID: 10103078 DOI: 10.1046/j.1460-9568.1999.00490.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We previously reported that myelin-associated oligodendrocytic basic protein (MOBP) was abundantly expressed in the central nervous system (CNS) myelin, and shared several characteristics with myelin basic protein (MBP). In particular, a cluster of positively charged amino acids was considered to facilitate compaction of the cytoplasmic face of the myelin sheath, as in the case of MBP. However, the contribution of MOBP in forming and maintaining the myelin sheath still remains unclear. Recent investigations showed that one isoform of MOBP was expressed in the embryo prior to myelination, and MOBP isoforms were colocalized with the microtubular network and nucleus in vitro. To explore the role of MOBP in vivo, we generated MOBP-deficient mice and analysed the CNS myelin. Surprisingly, the compact myelin was formed, however, the myelin from MOBP-deficient mice exposed to hexachlorophene, a known dysmyelinating agent, showed widening of the major dense lines. These results suggest that MOBP is not essential for myelin formation, but reinforces the apposition of the cytoplasmic faces of the myelin sheath. A striking phenotype of MOBP-deficient mice was the presence of the straight 'condensed' radial component. This component has been described as a tight junction-like complex running radially and zig-zag through the CNS myelin sheath between inner and outer mesaxons. These results suggest that MOBP is essential for normal arrangement of the radial component.
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Affiliation(s)
- Y Yamamoto
- Department of Neurology, Osaka University Medical School, 2-2 Yamada- oka, Suita, Osaka 5650-0871, Japan
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50
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Montague P, Barrie JA, Thomson CE, Kirkham D, McCallion AS, Davies RW, Kennedy PG, Griffths IR. Cytoskeletal and nuclear localization of myelin oligodendrocytic basic protein isoforms. Eur J Neurosci 1998; 10:1321-8. [PMID: 9749786 DOI: 10.1046/j.1460-9568.1998.00143.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The recently described single copy myelin-associated oligodendrocytic basic protein (Mobp) gene is expressed exclusively in the central nervous system (CNS). The gene encodes a family of small highly basic polypeptides with predicted amino acid lengths of 69, 71, 81, 99 and 170, all of which share a 68 residue amino terminal. Here we report on the subcellular distribution of two of these polypeptides termed MOBP81 and MOBP170 in transiently transfected Cos7 cells using an antibody raised against a region common to all isoforms of MOBP. Additionally, we describe MOBP trafficking in cultured mouse spinal cord oligodendrocytes. Immunostaining for MOBP81 is intense in the perinuclear region and extends throughout the cytoplasm colocalizing with the microtubular cytoskeletal network. Consistent with this we demonstrate that MOBP partitions with the cytoskeletal fraction prepared from myelin. In contrast, although MOBP170 is present in the cytoplasm it does not colocalize with the cytoskeleton and displays a greater variation in distribution. In the majority of transfectants immunostaining is present throughout the karyoplasm but with increased intensity around the nucleolus. Within mouse primary oligodendrocytes endogenous MOBP is present in the cell body and processes colocalizing with the microtubular network. Immunoreactivity is not detectable in the nucleus in these mature oligodendrocytes. These significant differences in MOBP81 and MOBP170 protein kinesis coupled to different expression profiles of their respective message populations may be indicative of both myelin structural and cellular/regulatory functions, respectively, for these polypeptides.
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Affiliation(s)
- P Montague
- Dept of Veterinary Clinical Studies, University of Glasgow, Bearsden, Scotland, UK.
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