1
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Kattan FG, Koukouraki P, Anagnostopoulos AK, Tsangaris GT, Doxakis E. RNA binding protein AUF1/HNRNPD regulates nuclear export, stability and translation of SNCA transcripts. Open Biol 2023; 13:230158. [PMID: 37989221 PMCID: PMC10688287 DOI: 10.1098/rsob.230158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/11/2023] [Indexed: 11/23/2023] Open
Abstract
Alpha-synuclein (SNCA) accumulation plays a central role in the pathogenesis of Parkinson's disease. Determining and interfering with the mechanisms that control SNCA expression is one approach to limiting disease progression. Currently, most of our understanding of SNCA regulation is protein-based. Post-transcriptional mechanisms directly regulating SNCA mRNA expression via its 3' untranslated region (3'UTR) were investigated here. Mass spectrometry of proteins pulled down from murine brain lysates using a biotinylated SNCA 3'UTR revealed multiple RNA-binding proteins, of which HNRNPD/AUF1 was chosen for further analysis. AUF1 bound both proximal and distal regions of the SNCA 3'UTR, but not the 5'UTR or CDS. In the nucleus, AUF1 attenuated SNCA pre-mRNA maturation and was indispensable for the export of SNCA transcripts. AUF1 destabilized SNCA transcripts in the cytosol, primarily those with shorter 3'UTRs, independently of microRNAs by recruiting the CNOT1-CNOT7 deadenylase complex to trim the polyA tail. Furthermore, AUF1 inhibited SNCA mRNA binding to ribosomes. These data identify AUF1 as a multi-tasking protein regulating maturation, nucleocytoplasmic shuttling, stability and translation of SNCA transcripts.
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Affiliation(s)
- Fedon-Giasin Kattan
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Soranou Efesiou 4, Athens 11527, Greece
- Department of Biological Applications and Technology, Faculty of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
| | - Pelagia Koukouraki
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Soranou Efesiou 4, Athens 11527, Greece
| | - Athanasios K. Anagnostopoulos
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Soranou Efesiou 4, Athens 11527, Greece
| | - George T. Tsangaris
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Soranou Efesiou 4, Athens 11527, Greece
| | - Epaminondas Doxakis
- Center of Basic Research, Biomedical Research Foundation of the Academy of Athens (BRFAA), Soranou Efesiou 4, Athens 11527, Greece
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2
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Mata I, Salles P, Cornejo-Olivas M, Saffie P, Ross OA, Reed X, Bandres-Ciga S. LRRK2: Genetic mechanisms vs genetic subtypes. HANDBOOK OF CLINICAL NEUROLOGY 2023; 193:133-154. [PMID: 36803807 DOI: 10.1016/b978-0-323-85555-6.00018-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
In 2004, the identification of pathogenic variants in the LRRK2 gene across several families with autosomal dominant late-onset Parkinson's disease (PD) revolutionized our understanding of the role of genetics in PD. Previous beliefs that genetics in PD was limited to rare early-onset or familial forms of the disease were quickly dispelled. Currently, we recognize LRRK2 p.G2019S as the most common genetic cause of both sporadic and familial PD, with more than 100,000 affected carriers across the globe. The frequency of LRRK2 p.G2019S is also highly variable across populations, with some regions of Asian or Latin America reporting close to 0%, contrasting to Ashkenazi Jews or North African Berbers reporting up to 13% and 40%, respectively. Patients with LRRK2 pathogenic variants are clinically and pathologically heterogeneous, highlighting the age-related variable penetrance that also characterizes LRRK2-related disease. Indeed, the majority of patients with LRRK2-related disease are characterized by a relatively mild Parkinsonism with less motor symptoms with variable presence of α-synuclein and/or tau aggregates, with pathologic pleomorphism widely described. At a functional cellular level, it is likely that pathogenic variants mediate a toxic gain-of-function of the LRRK2 protein resulting in increased kinase activity perhaps in a cell-specific manner; by contrast, some LRRK2 variants appear to be protective reducing PD risk by decreasing the kinase activity. Therefore, employing this information to define appropriate patient populations for clinical trials of targeted kinase LRRK2 inhibition strategies is very promising and demonstrates a potential future application for PD using precision medicine.
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Affiliation(s)
- Ignacio Mata
- Genomic Medicine Institute (GMI), Cleveland Clinic, Cleveland, OH, United States.
| | - Philippe Salles
- Corporación Centro de Trastornos del Movimiento (CETRAM), Lo Espejo, Santiago, Chile
| | - Mario Cornejo-Olivas
- Neurogenetics Research Center, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
| | - Paula Saffie
- Corporación Centro de Trastornos del Movimiento (CETRAM), Lo Espejo, Santiago, Chile
| | - Owen A Ross
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, United States
| | - Xylena Reed
- Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, United States
| | - Sara Bandres-Ciga
- Laboratory of Neurogenetics and Center for Alzheimer's and Related Dementias, National Institute on Aging, National Institutes of Health, Bethesda, MD, United States
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3
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Blažeković A, Jerčić KG, Borovečki F. SNCA 3' UTR Genetic Variants in Patients with Parkinson's Disease. Biomolecules 2021; 11:1799. [PMID: 34944443 PMCID: PMC8698872 DOI: 10.3390/biom11121799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/15/2021] [Accepted: 11/27/2021] [Indexed: 11/26/2022] Open
Abstract
The SNCA (Synuclein Alpha) gene represents a major risk gene for Parkinson's disease (PD) and SNCA polymorphisms have been associated with the common sporadic form of PD. Numerous Genome-Wide Association Studies showed strong signals located in the SNCA 3' UTR (untranslated region) region indicating that variants in 3' UTRs of PD-associated genes could contribute to neurodegeneration and may regulate the risk for PD. Genetic variants in 3' UTR can affect miRNA activity and consequently change the translation process. The aim of this study was to access the differences in 3' UTR variants of SNCA genes in a cohort of PD patients and control subjects from Croatia. The cohort consisted of 52 PD patients and 23 healthy control subjects. Differences between 3' UTR allele and genotype frequencies were accessed through next generation sequencing approach from whole blood samples. In our study, we identified four previously reported single nucleotide polymorphisms (SNPs) and one insertion in the 3' UTR region of SNCA gene, namely rs1045722, rs3857053, rs577490090, rs356165, and rs777296100, and five variants not reported in the literature, namely rs35270750, rs529553259, rs377356638, rs571454522, and rs750347645. Our results indicate a significantly higher occurrence of the rs571454522 variant in the PD population. To the best of our knowledge, this variant has not been reported until now in the literature. We analyzed our results in the context of previous research, creating a brief overview of the importance of 3' UTR variants of the SNCA gene. Further studies will be needed to gain a more profound insight regarding their role in PD development, which will help to assess the role and impact of post-transcriptional regulation on disease pathology.
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Affiliation(s)
- Antonela Blažeković
- Department for Functional Genomics, Center for Translational and Clinical Research, University of Zagreb School of Medicine, University Hospital Center Zagreb, 10000 Zagreb, Croatia; (K.G.J.); (F.B.)
- Department for Anatomy and Clinical Anatomy, University of Zagreb School of Medicine, 10000 Zagreb, Croatia
| | - Kristina Gotovac Jerčić
- Department for Functional Genomics, Center for Translational and Clinical Research, University of Zagreb School of Medicine, University Hospital Center Zagreb, 10000 Zagreb, Croatia; (K.G.J.); (F.B.)
- Department of Neurology, University Hospital Center Zagreb, 10000 Zagreb, Croatia
| | - Fran Borovečki
- Department for Functional Genomics, Center for Translational and Clinical Research, University of Zagreb School of Medicine, University Hospital Center Zagreb, 10000 Zagreb, Croatia; (K.G.J.); (F.B.)
- Department of Neurology, University Hospital Center Zagreb, 10000 Zagreb, Croatia
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4
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Frydas A, Wauters E, van der Zee J, Van Broeckhoven C. Uncovering the impact of noncoding variants in neurodegenerative brain diseases. Trends Genet 2021; 38:258-272. [PMID: 34535299 DOI: 10.1016/j.tig.2021.08.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/11/2021] [Accepted: 08/17/2021] [Indexed: 12/14/2022]
Abstract
Neurodegenerative brain diseases (NBDs) are characterized by cognitive decline and movement impairments caused by neuronal loss in different brain regions. A large fraction of the genetic heritability of NBDs is not explained by the current known mutations. Genome-wide association studies identified novel disease-risk loci, adding to the genetic basis of NBDs. Many of the associated variants reside in noncoding regions with distinct molecular functions. Genetic variation in these regions can alter functions and contribute to disease pathogenesis. Here, we discuss noncoding variants associated with NBDs. Methods for better functional interpretation of noncoding variation will expand our knowledge of the genetic architecture of NBDs and broaden the routes for therapeutic strategies.
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Affiliation(s)
- Alexandros Frydas
- Neurodegenerative Brain Diseases, Center for Molecular Neurology, VIB, Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Eline Wauters
- Neurodegenerative Brain Diseases, Center for Molecular Neurology, VIB, Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Julie van der Zee
- Neurodegenerative Brain Diseases, Center for Molecular Neurology, VIB, Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Christine Van Broeckhoven
- Neurodegenerative Brain Diseases, Center for Molecular Neurology, VIB, Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium.
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5
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Strauß T, Marvian-Tayaranian A, Sadikoglou E, Dhingra A, Wegner F, Trümbach D, Wurst W, Heutink P, Schwarz SC, Höglinger GU. iPS Cell-Based Model for MAPT Haplotype as a Risk Factor for Human Tauopathies Identifies No Major Differences in TAU Expression. Front Cell Dev Biol 2021; 9:726866. [PMID: 34532319 PMCID: PMC8438159 DOI: 10.3389/fcell.2021.726866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 08/09/2021] [Indexed: 11/13/2022] Open
Abstract
The H1 haplotype of the microtubule-associated protein tau (MAPT) gene is a common genetic risk factor for some neurodegenerative diseases such as progressive supranuclear palsy, corticobasal degeneration, and Parkinson's disease. The molecular mechanism causing the increased risk for the named diseases, however, remains unclear. In this paper, we present a valuable tool of eight small molecule neural precursor cell lines (smNPC) homozygous for the MAPT haplotypes (four H1/H1 and four H2/H2 cell lines), which can be used to identify MAPT-dependent phenotypes. The employed differentiation protocol is fast due to overexpression of NEUROGENIN-2 and therefore suitable for high-throughput approaches. A basic characterization of all human cell lines was performed, and their TAU and α-SYNUCLEIN profiles were compared during a differentiation time of 30 days. We could identify higher levels of conformationally altered TAU in cell lines carrying the H2 haplotype. Additionally, we found increased expression levels of α-SYNUCLEIN in H1/H1 cells. With this resource, we aim to fill a gap in neurodegenerative disease modeling with induced pluripotent stem cells (iPSC) for sporadic tauopathies.
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Affiliation(s)
- Tabea Strauß
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Department of Neurology, Technical University Munich, Munich, Germany
| | - Amir Marvian-Tayaranian
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Department of Neurology, Technical University Munich, Munich, Germany
| | - Eldem Sadikoglou
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Ashutosh Dhingra
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Florian Wegner
- Department of Neurology, Hanover Medical School, Hanover, Germany
- Center for Systems Neuroscience, Hanover, Germany
| | - Dietrich Trümbach
- Institute of Developmental Genetics, Helmholtz Zentrum München, Oberschleißheim, Germany
| | - Wolfgang Wurst
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Institute of Developmental Genetics, Helmholtz Zentrum München, Oberschleißheim, Germany
- TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Peter Heutink
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- Department for Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Sigrid C. Schwarz
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Department of Neurology, Technical University Munich, Munich, Germany
- Geriatric Clinic Haag, Haag in Oberbayern, Germany
| | - Günter U. Höglinger
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Department of Neurology, Technical University Munich, Munich, Germany
- Department of Neurology, Hanover Medical School, Hanover, Germany
- Center for Systems Neuroscience, Hanover, Germany
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6
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Abstract
Interpreting the effects of genetic variants is key to understanding individual susceptibility to disease and designing personalized therapeutic approaches. Modern experimental technologies are enabling the generation of massive compendia of human genome sequence data and associated molecular and phenotypic traits, together with genome-scale expression, epigenomics and other functional genomic data. Integrative computational models can leverage these data to understand variant impact, elucidate the effect of dysregulated genes on biological pathways in specific disease and tissue contexts, and interpret disease risk beyond what is feasible with experiments alone. In this Review, we discuss recent developments in machine learning algorithms for genome interpretation and for integrative molecular-level modelling of cells, tissues and organs relevant to disease. More specifically, we highlight existing methods and key challenges and opportunities in identifying specific disease-causing genetic variants and linking them to molecular pathways and, ultimately, to disease phenotypes.
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7
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Pedersen CC, Lange J, Førland MGG, Macleod AD, Alves G, Maple-Grødem J. A systematic review of associations between common SNCA variants and clinical heterogeneity in Parkinson's disease. NPJ PARKINSONS DISEASE 2021; 7:54. [PMID: 34210990 PMCID: PMC8249472 DOI: 10.1038/s41531-021-00196-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 06/02/2021] [Indexed: 11/09/2022]
Abstract
There is great heterogeneity in both the clinical presentation and rate of disease progression among patients with Parkinson’s disease (PD). This can pose prognostic difficulties in a clinical setting, and a greater understanding of the risk factors that contribute to modify disease course is of clear importance for optimizing patient care and clinical trial design. Genetic variants in SNCA are an established risk factor for PD and are candidates to modify disease presentation and progression. This systematic review aimed to summarize all available primary research reporting the association of SNCA polymorphisms with features of PD. We systematically searched PubMed and Web of Science, from inception to 1 June 2020, for studies evaluating the association of common SNCA variants with age at onset (AAO) or any clinical feature attributed to PD in patients with idiopathic PD. Fifty-eight studies were included in the review that investigated the association between SNCA polymorphisms and a broad range of outcomes, including motor and cognitive impairment, sleep disorders, mental health, hyposmia, or AAO. The most reproducible findings were with the REP1 polymorphism or rs356219 and an earlier AAO, but no clear associations were identified with an SNCA polymorphism and any individual clinical outcome. The results of this comprehensive summary suggest that, while there is evidence that genetic variance in the SNCA region may have a small impact on clinical outcomes in PD, the mechanisms underlying the association of SNCA polymorphisms with PD risk may not be a major factor driving clinical heterogeneity in PD.
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Affiliation(s)
- Camilla Christina Pedersen
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway.,Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway
| | - Johannes Lange
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway.,Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway
| | | | - Angus D Macleod
- Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
| | - Guido Alves
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway.,Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway.,Department of Neurology, Stavanger University Hospital, Stavanger, Norway
| | - Jodi Maple-Grødem
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway. .,Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway.
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8
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Lai D, Alipanahi B, Fontanillas P, Schwantes-An TH, Aasly J, Alcalay RN, Beecham GW, Berg D, Bressman S, Brice A, Brockman K, Clark L, Cookson M, Das S, Van Deerlin V, Follett J, Farrer MJ, Trinh J, Gasser T, Goldwurm S, Gustavsson E, Klein C, Lang AE, Langston JW, Latourelle J, Lynch T, Marder K, Marras C, Martin ER, McLean CY, Mejia-Santana H, Molho E, Myers RH, Nuytemans K, Ozelius L, Payami H, Raymond D, Rogaeva E, Rogers MP, Ross OA, Samii A, Saunders-Pullman R, Schüle B, Schulte C, Scott WK, Tanner C, Tolosa E, Tomkins JE, Vilas D, Trojanowski JQ, Uitti R, Vance JM, Visanji NP, Wszolek ZK, Zabetian CP, Mirelman A, Giladi N, Orr Urtreger A, Cannon P, Fiske B, Foroud T. Genomewide Association Studies of LRRK2 Modifiers of Parkinson's Disease. Ann Neurol 2021; 90:76-88. [PMID: 33938021 PMCID: PMC8252519 DOI: 10.1002/ana.26094] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/28/2021] [Accepted: 04/29/2021] [Indexed: 02/03/2023]
Abstract
Objective The aim of this study was to search for genes/variants that modify the effect of LRRK2 mutations in terms of penetrance and age‐at‐onset of Parkinson's disease. Methods We performed the first genomewide association study of penetrance and age‐at‐onset of Parkinson's disease in LRRK2 mutation carriers (776 cases and 1,103 non‐cases at their last evaluation). Cox proportional hazard models and linear mixed models were used to identify modifiers of penetrance and age‐at‐onset of LRRK2 mutations, respectively. We also investigated whether a polygenic risk score derived from a published genomewide association study of Parkinson's disease was able to explain variability in penetrance and age‐at‐onset in LRRK2 mutation carriers. Results A variant located in the intronic region of CORO1C on chromosome 12 (rs77395454; p value = 2.5E‐08, beta = 1.27, SE = 0.23, risk allele: C) met genomewide significance for the penetrance model. Co‐immunoprecipitation analyses of LRRK2 and CORO1C supported an interaction between these 2 proteins. A region on chromosome 3, within a previously reported linkage peak for Parkinson's disease susceptibility, showed suggestive associations in both models (penetrance top variant: p value = 1.1E‐07; age‐at‐onset top variant: p value = 9.3E‐07). A polygenic risk score derived from publicly available Parkinson's disease summary statistics was a significant predictor of penetrance, but not of age‐at‐onset. Interpretation This study suggests that variants within or near CORO1C may modify the penetrance of LRRK2 mutations. In addition, common Parkinson's disease associated variants collectively increase the penetrance of LRRK2 mutations. ANN NEUROL 2021;90:82–94
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Affiliation(s)
- Dongbing Lai
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN
| | | | | | - Tae-Hwi Schwantes-An
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN
| | - Jan Aasly
- Department of Neurology, St. Olavs Hospital, Trondheim, Norway
| | - Roy N Alcalay
- Department of Neurology, Columbia University, New York, NY
| | - Gary W Beecham
- John P. Hussman Institute for Human Genomics and Dr. John T. Macdonald Department of Human Genetics, University of Miami, Miller School of Medicine, Miami, FL
| | - Daniela Berg
- Department of Neurology, Christian-Albrechts-University of Kiel, Kiel, Germany.,Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Susan Bressman
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Alexis Brice
- Sorbonne Université, Institut du Cerveau et de la Moelle épinière (ICM), AP-HP, Inserm, CNRS, University Hospital Pitié-Salpêtrière, Paris, France
| | - Kathrin Brockman
- Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Lorraine Clark
- Department of Pathology and Cell Biology, Columbia University, New York, NY
| | - Mark Cookson
- Laboratory of Neurogenetics, National Institute of Aging, National Institute of Health, Bethesda, MD
| | | | - Vivianna Van Deerlin
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA
| | - Jordan Follett
- Laboratory of Neurogenetics and Neuroscience, Fixel Institute for Neurological Diseases, McKnight Brain Institute, L5-101D, UF Clinical and Translational Science Institute, University of Florida, Gainesville, FL
| | - Matthew J Farrer
- Laboratory of Neurogenetics and Neuroscience, Fixel Institute for Neurological Diseases, McKnight Brain Institute, L5-101D, UF Clinical and Translational Science Institute, University of Florida, Gainesville, FL
| | - Joanne Trinh
- Institute of Neurogenetics, University of Luebeck, Luebeck, Germany
| | - Thomas Gasser
- Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | | | - Emil Gustavsson
- Centre for Applied Neurogenetics, University of British Columbia, Vancouver, Canada
| | - Christine Klein
- Institute of Neurogenetics, University of Luebeck, Luebeck, Germany
| | - Anthony E Lang
- The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada
| | - J William Langston
- Departments of Neurology, Neuroscience, and Pathology, Stanford University School of Medicine, Stanford, CA
| | | | - Timothy Lynch
- Dublin Neurological Institute at the Mater Misericordiae University Hospital, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, Ireland
| | - Karen Marder
- Department of Neurology and Psychiatry, Taub Institute and Sergievsky Center, Columbia University Vagelos College of Physicians and Surgeons, New York, NY
| | - Connie Marras
- The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada
| | - Eden R Martin
- John P. Hussman Institute for Human Genomics and Dr. John T. Macdonald Department of Human Genetics, University of Miami, Miller School of Medicine, Miami, FL
| | - Cory Y McLean
- 23andMe, Inc., Sunnyvale, CA.,Google LLC, Cambridge, MA
| | | | - Eric Molho
- Department of Neurology, Albany Medical College, Albany, NY
| | | | - Karen Nuytemans
- John P. Hussman Institute for Human Genomics and Dr. John T. Macdonald Department of Human Genetics, University of Miami, Miller School of Medicine, Miami, FL
| | - Laurie Ozelius
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Haydeh Payami
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL
| | - Deborah Raymond
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Ekaterina Rogaeva
- Tanz Centre for Research in Neurodegenerative Diseases and Department of Neurology, University of Toronto, Toronto, Canada
| | - Michael P Rogers
- Department of General Surgery, University of South Florida Morsani College of Medicine, Tampa, FL
| | - Owen A Ross
- Departments of Neuroscience and Clinical Genomics, Mayo Clinic, Jacksonville, FL.,School of Medicine and Medical Science, University College Dublin, Dublin, Ireland
| | - Ali Samii
- VA Puget Sound Health Care System and Department of Neurology, University of Washington, Seattle, WA
| | | | - Birgitt Schüle
- Department of Pathology, Stanford University School of Medicine, Stanford, CA
| | - Claudia Schulte
- Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.,German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - William K Scott
- John P. Hussman Institute for Human Genomics and Dr. John T. Macdonald Department of Human Genetics, University of Miami, Miller School of Medicine, Miami, FL
| | - Caroline Tanner
- University of California, San Francisco Veterans Affairs Health Care System, San Francisco, CA
| | - Eduardo Tolosa
- Parkinson Disease and Movement Disorders Unit, Hospital Clínic Universitari, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB), Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Barcelona, Spain
| | | | - Dolores Vilas
- Parkinson Disease and Movement Disorders Unit, Hospital Clínic Universitari, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona (UB), Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Barcelona, Spain
| | - John Q Trojanowski
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA
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- 23andMe, Inc., Sunnyvale, CA
| | - Ryan Uitti
- Department of Neurology, Mayo Clinic, Jacksonville, FL
| | - Jeffery M Vance
- John P. Hussman Institute for Human Genomics and Dr. John T. Macdonald Department of Human Genetics, University of Miami, Miller School of Medicine, Miami, FL
| | - Naomi P Visanji
- The Edmond J. Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada
| | | | - Cyrus P Zabetian
- VA Puget Sound Health Care System and Department of Neurology, University of Washington, Seattle, WA
| | - Anat Mirelman
- Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Nir Giladi
- Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Avi Orr Urtreger
- Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | | | - Brian Fiske
- The Michael J. Fox Foundation for Parkinson's Research, New York, NY
| | - Tatiana Foroud
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN
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9
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Gao Y, Wilson GR, Salce N, Romano A, Mellick GD, Stephenson SEM, Lockhart PJ. Genetic Analysis of RAB39B in an Early-Onset Parkinson's Disease Cohort. Front Neurol 2020; 11:523. [PMID: 32670181 PMCID: PMC7332711 DOI: 10.3389/fneur.2020.00523] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 05/12/2020] [Indexed: 12/12/2022] Open
Abstract
Pathogenic variants in the gene encoding RAB39B, resulting in the loss of protein function, lead to the development of X-linked early-onset parkinsonism. The gene is located within a chromosomal region that is susceptible to genomic rearrangement, and while an increased dosage of RAB39B was previously associated with cognitive impairment, the potential role of dosage alterations in Parkinson's disease (PD) remains to be determined. This study aimed to investigate the contribution of the genetic variation in RAB39B to the development of early-onset PD. We performed gene dosage studies and sequence analysis in a cohort of 176 individuals with early-onset PD (age of onset ≤ 50 years) of unknown genetic etiology. An assessment of the copy number variation over both coding exons and the 3' untranslated region (UTR) of RAB39B did not identify any alterations in gene dosage. An analysis of the UTRs identified two male individuals carrying single, likely benign, nucleotide variants in the 3'UTR (chrX:154489749-A-G and chrX:154489197-T-G). Furthermore, one novel variant of uncertain significance was identified in the 5'UTR, 229 bp upstream of the start codon (chrX:154493802-C-T). In silico analyses predicted that this variant disrupts a highly conserved transcription factor binding site and could impact RAB39B expression. The results of this study do not support a significant role for genetic variation in RAB39B as contributing to early-onset PD but do highlight that additional molecular studies are required to determine the mechanisms regulating RAB39B expression and their association with the disease. Genetic investigations in larger parkinsonism/PD cohorts and longitudinal studies of individuals with cognitive impairment due to an altered dosage of RAB39B will be required to fully delineate the contribution of RAB39B to parkinsonism.
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Affiliation(s)
- Yujing Gao
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, VIC, Australia
| | - Gabrielle R Wilson
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, VIC, Australia
| | - Nicholas Salce
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC, Australia
| | - Alexandra Romano
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia
| | - George D Mellick
- Griffith Institute for Drug Discovery (GRIDD), Griffith University, Nathan, QLD, Australia
| | - Sarah E M Stephenson
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, VIC, Australia
| | - Paul J Lockhart
- Bruce Lefroy Centre for Genetic Health Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, VIC, Australia
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10
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Fernández-Santiago R, Martín-Flores N, Antonelli F, Cerquera C, Moreno V, Bandres-Ciga S, Manduchi E, Tolosa E, Singleton AB, Moore JH, Martí MJ, Ezquerra M, Malagelada C. SNCA and mTOR Pathway Single Nucleotide Polymorphisms Interact to Modulate the Age at Onset of Parkinson's Disease. Mov Disord 2019; 34:1333-1344. [PMID: 31234232 PMCID: PMC7322732 DOI: 10.1002/mds.27770] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/25/2019] [Accepted: 05/27/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Single nucleotide polymorphisms (SNPs) in the α-synuclein (SNCA) gene are associated with differential risk and age at onset (AAO) of both idiopathic and Leucine-rich repeat kinase 2 (LRRK2)-associated Parkinson's disease (PD). Yet potential combinatory or synergistic effects among several modulatory SNPs for PD risk or AAO remain largely underexplored. OBJECTIVES The mechanistic target of rapamycin (mTOR) signaling pathway is functionally impaired in PD. Here we explored whether SNPs in the mTOR pathway, alone or by epistatic interaction with known susceptibility factors, can modulate PD risk and AAO. METHODS Based on functional relevance, we selected a total of 64 SNPs mapping to a total of 57 genes from the mTOR pathway and genotyped a discovery series cohort encompassing 898 PD patients and 921 controls. As a replication series, we screened 4170 PD and 3014 controls available from the International Parkinson's Disease Genomics Consortium. RESULTS In the discovery series cohort, we found a 4-loci interaction involving STK11 rs8111699, FCHSD1 rs456998, GSK3B rs1732170, and SNCA rs356219, which was associated with an increased risk of PD (odds ratio = 2.59, P < .001). In addition, we also found a 3-loci epistatic combination of RPTOR rs11868112 and RPS6KA2 rs6456121 with SNCA rs356219, which was associated (odds ratio = 2.89; P < .0001) with differential AAO. The latter was further validated (odds ratio = 1.56; P = 0.046-0.047) in the International Parkinson's Disease Genomics Consortium cohort. CONCLUSIONS These findings indicate that genetic variability in the mTOR pathway contributes to SNCA effects in a nonlinear epistatic manner to modulate differential AAO in PD, unraveling the contribution of this cascade in the pathogenesis of the disease. © 2019 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Rubén Fernández-Santiago
- Lab of Parkinson Disease and Other Neurodegenerative Movement Disorders, institut d’Investigacions Biomédiques August Pi i Sunyer, Barcelona, Catalonia, Spain
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
- Networked Centre for Biomedical Research of Neurodegenerative Diseases, Madrid, Spain
| | - Núria Martín-Flores
- Department of Biomedicine, Unit of Biochemistry, Universitat de Barcelona, Barcelona, Catalonia, Spain
- institute of Neurosciences, University of Barcelona, Barcelona, Catalonia, Spain
| | - Francesca Antonelli
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
| | - Catalina Cerquera
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
| | - Verónica Moreno
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
| | - Sara Bandres-Ciga
- Laboratory of Neurogenetics, National institute on Aging, National institutes of Health, Bethesda, Maryland, USA
- instituto de investigación Biosanitaria de Granada (ibs. GRANADA), Granada, Spain
| | - Elisabetta Manduchi
- The Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Eduard Tolosa
- Lab of Parkinson Disease and Other Neurodegenerative Movement Disorders, institut d’Investigacions Biomédiques August Pi i Sunyer, Barcelona, Catalonia, Spain
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
- Networked Centre for Biomedical Research of Neurodegenerative Diseases, Madrid, Spain
| | - Andrew B. Singleton
- Laboratory of Neurogenetics, National institute on Aging, National institutes of Health, Bethesda, Maryland, USA
| | - Jason H. Moore
- The Perelman School of Medicine University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - María-Josep Martí
- Lab of Parkinson Disease and Other Neurodegenerative Movement Disorders, institut d’Investigacions Biomédiques August Pi i Sunyer, Barcelona, Catalonia, Spain
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
- Networked Centre for Biomedical Research of Neurodegenerative Diseases, Madrid, Spain
| | - Mario Ezquerra
- Lab of Parkinson Disease and Other Neurodegenerative Movement Disorders, institut d’Investigacions Biomédiques August Pi i Sunyer, Barcelona, Catalonia, Spain
- Neurology Service, Hospital Clinic de Barcelona, Barcelona, Catalonia, Spain
- Networked Centre for Biomedical Research of Neurodegenerative Diseases, Madrid, Spain
| | - Cristina Malagelada
- Department of Biomedicine, Unit of Biochemistry, Universitat de Barcelona, Barcelona, Catalonia, Spain
- institute of Neurosciences, University of Barcelona, Barcelona, Catalonia, Spain
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11
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Rs2015 Polymorphism in miRNA Target Site of Sirtuin2 Gene Is Associated with the Risk of Parkinson's Disease in Chinese Han Population. BIOMED RESEARCH INTERNATIONAL 2019; 2019:1498034. [PMID: 31214610 PMCID: PMC6535834 DOI: 10.1155/2019/1498034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 04/06/2019] [Accepted: 04/11/2019] [Indexed: 12/13/2022]
Abstract
Accumulating evidence reveals that the sirtuin family is involved in the pathology of Parkinson's disease (PD). However, the association between the polymorphisms of the sirtuin gene and the risk of PD remains elusive. Here, we investigated the possible association of nine SIRT1 and SIRT2 SNPs with the risk of PD through a clinical case-control study from the Chinese Han population. Our results showed that rs12778366 in the promoter region of SIRT1 and rs2015 in the 3′untranslated region (3′UTR) of the SIRT2 were significantly associated with the risk of PD. Five SNPs related to SIRT1, rs3740051, rs7895833, rs7069102, rs2273773, and rs4746720 and two SNPs related to SIRT2, rs10410544, and rs45592833 did not show an association with PD risk in this study. Moreover, we found that mRNA level of SIRT2 was upregulated, and mRNA level of SIRT1 was downregulated in the peripheral blood of PD patients compared with healthy controls, and we also observed that SNPs rs12778366 and rs2015 influenced the SIRT1 and SIRT2 expression levels, respectively. Further functional assays suggest that rs2015 may affect the expression of SIRT2 by affecting the binding of miR-8061 to the 3′UTR of SIRT2, ultimately contributing to the risk of PD.
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12
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Del Rey NLG, Quiroga-Varela A, Garbayo E, Carballo-Carbajal I, Fernández-Santiago R, Monje MHG, Trigo-Damas I, Blanco-Prieto MJ, Blesa J. Advances in Parkinson's Disease: 200 Years Later. Front Neuroanat 2018; 12:113. [PMID: 30618654 PMCID: PMC6306622 DOI: 10.3389/fnana.2018.00113] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 11/26/2018] [Indexed: 12/20/2022] Open
Abstract
When James Parkinson described the classical symptoms of the disease he could hardly foresee the evolution of our understanding over the next two hundred years. Nowadays, Parkinson’s disease is considered a complex multifactorial disease in which genetic factors, either causative or susceptibility variants, unknown environmental cues, and the potential interaction of both could ultimately trigger the pathology. Noteworthy advances have been made in different fields from the clinical phenotype to the decoding of some potential neuropathological features, among which are the fields of genetics, drug discovery or biomaterials for drug delivery, which, though recent in origin, have evolved swiftly to become the basis of research into the disease today. In this review, we highlight some of the key advances in the field over the past two centuries and discuss the current challenges focusing on exciting new research developments likely to come in the next few years. Also, the importance of pre-motor symptoms and early diagnosis in the search for more effective therapeutic options is discussed.
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Affiliation(s)
- Natalia López-González Del Rey
- HM CINAC, Hospital Universitario HM Puerta del Sur, Madrid, Spain.,Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
| | - Ana Quiroga-Varela
- Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain.,Department of Neuroscience, Centro de Investigación Médica Aplicada (CIMA), University of Navarra, Pamplona, Spain
| | - Elisa Garbayo
- Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, Pamplona, Spain.,Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Iria Carballo-Carbajal
- Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain.,Neurodegenerative Diseases Research Group, Vall d'Hebron Research Institute, Barcelona, Spain
| | - Rubén Fernández-Santiago
- Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain.,Laboratory of Parkinson Disease and other Neurodegenerative Movement Disorders, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain
| | - Mariana H G Monje
- HM CINAC, Hospital Universitario HM Puerta del Sur, Madrid, Spain.,Department of Anatomy, Histology and Neuroscience, Facultad de Medicina, Universidad Autónoma de Madrid, Madrid, Spain
| | - Inés Trigo-Damas
- HM CINAC, Hospital Universitario HM Puerta del Sur, Madrid, Spain.,Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
| | - María J Blanco-Prieto
- Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, Pamplona, Spain.,Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Javier Blesa
- HM CINAC, Hospital Universitario HM Puerta del Sur, Madrid, Spain.,Biomedical Research Networking Center on Neurodegenerative Diseases (CIBERNED), Madrid, Spain
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13
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Zhang Y, Shu L, Sun Q, Pan H, Guo J, Tang B. A Comprehensive Analysis of the Association Between SNCA Polymorphisms and the Risk of Parkinson's Disease. Front Mol Neurosci 2018; 11:391. [PMID: 30410434 PMCID: PMC6209653 DOI: 10.3389/fnmol.2018.00391] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 10/05/2018] [Indexed: 12/14/2022] Open
Abstract
Background: Various studies have reported associations between synuclein alpha (SNCA) polymorphisms and Parkinson's disease (PD) risk. However, the results are inconsistent. We conducted a comprehensive meta-analysis of the associations between SNCA single-nucleotide polymorphisms (SNPs) and PD risk in overall populations and subpopulations by ethnicity. Methods: Standard meta-analysis was conducted according to our protocol with a cutoff point of p < 0.05. To find the most relevant SNCA SNPs, we used a cutoff point of p < 1 × 10−5 in an analysis based on the allele model. In the subgroup analysis by ethnicity, we divided the overall populations into five ethnic groups. We conducted further analysis on the most relevant SNPs using dominant and recessive models to identify the contributions of heterozygotes and homozygotes regarding each SNP. Results: In our comprehensive meta-analysis, 24,075 cases and 22,877 controls from 36 articles were included. We included 16 variants in the meta-analysis and found 12 statistically significant variants with p < 0.05. After narrowing down the variants using the p < 1 × 10−5 cutoff, in overall populations, seven SNPs increased the risk of PD (rs2736990, rs356220, rs356165, rs181489, rs356219, rs11931074, and rs2737029, with odds ratios [ORs] of 1.22–1.38) and one SNP decreased the risk (rs356186, with an OR of 0.77). In the East Asian group, rs2736990 and rs11931074 increased the risk (with ORs of 1.22–1.34). In the European group, five SNPs increased the risk (rs356219, rs181489, rs2737029, rs356165, and rs11931074, with ORs of 1.26–1.37) while one SNP decreased the risk (rs356186, with an OR of 0.77). The heterozygotes and homozygotes contributed differently depending on the variant. Conclusions: In summary, we found eight SNCA SNPs associated with PD risk, which had obvious differences between ethnicities. Seven SNPs increased the risk of PD and one SNP decreased the risk in the overall populations. In the East Asian group, rs2736990 and rs11931074 increased the risk. In the European group, rs356219, rs181489, rs2737029, rs356165, and rs11931074 increased the risk while rs356186 decreased the risk. Variants with the highest ORs and allele frequencies in our analysis should be given priority when carrying out genetic screening.
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Affiliation(s)
- Yuan Zhang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Li Shu
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Qiying Sun
- Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
| | - Hongxu Pan
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Jifeng Guo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China.,Parkinson's Disease Center of Beijing Institute for Brain Disorders, Beijing, China.,Collaborative Innovation Center for Brain Science, Shanghai, China.,Collaborative Innovation Center for Genetics and Development, Shanghai, China
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China.,Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Changsha, China.,Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China.,Parkinson's Disease Center of Beijing Institute for Brain Disorders, Beijing, China.,Collaborative Innovation Center for Brain Science, Shanghai, China.,Collaborative Innovation Center for Genetics and Development, Shanghai, China.,Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, China
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14
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Cresto N, Gardier C, Gubinelli F, Gaillard MC, Liot G, West AB, Brouillet E. The unlikely partnership between LRRK2 and α-synuclein in Parkinson's disease. Eur J Neurosci 2018; 49:339-363. [PMID: 30269383 DOI: 10.1111/ejn.14182] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 09/11/2018] [Accepted: 09/17/2018] [Indexed: 12/19/2022]
Abstract
Our understanding of the mechanisms underlying Parkinson's disease, the once archetypical nongenetic neurogenerative disorder, has dramatically increased with the identification of α-synuclein and LRRK2 pathogenic mutations. While α-synuclein protein composes the aggregates that can spread through much of the brain in disease, LRRK2 encodes a multidomain dual-enzyme distinct from any other protein linked to neurodegeneration. In this review, we discuss emergent datasets from multiple model systems that suggest these unlikely partners do interact in important ways in disease, both within cells that express both LRRK2 and α-synuclein as well as through more indirect pathways that might involve neuroinflammation. Although the link between LRRK2 and disease can be understood in part through LRRK2 kinase activity (phosphotransferase activity), α-synuclein toxicity is multilayered and plausibly interacts with LRRK2 kinase activity in several ways. We discuss common protein interactors like 14-3-3s that may regulate α-synuclein and LRRK2 in disease. Finally, we examine cellular pathways and outcomes common to both mutant α-synuclein expression and LRRK2 activity and points of intersection. Understanding the interplay between these two unlikely partners in disease may provide new therapeutic avenues for PD.
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Affiliation(s)
- Noémie Cresto
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
| | - Camille Gardier
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
| | - Francesco Gubinelli
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
| | - Marie-Claude Gaillard
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
| | - Géraldine Liot
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
| | - Andrew B West
- Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Emmanuel Brouillet
- Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, and MIRCen (Molecular Imaging Research Centre), Institut François Jacob, DRF, CEA, Fontenay-aux-Roses, France
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15
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Je G, Guhathakurta S, Yun SP, Ko HS, Kim YS. A novel extended form of alpha-synuclein 3'UTR in the human brain. Mol Brain 2018; 11:29. [PMID: 29801501 PMCID: PMC5970512 DOI: 10.1186/s13041-018-0371-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 05/15/2018] [Indexed: 11/10/2022] Open
Abstract
Alpha-synuclein (α-SYN) is one of the key contributors in Parkinson's disease (PD) pathogenesis. Despite the fact that increased α-SYN levels are considered one of the key contributors in developing PD, the molecular mechanisms underlying the regulation of α-SYN still needs to be elucidated. Since the 3' untranslated regions (3'UTRs) of messenger RNAs (mRNAs) have important roles in translation, localization, and stability of mRNAs through RNA binding proteins (RBPs) and microRNAs (miRNAs), it is important to identify the exact length of 3'UTRs of transcripts in order to understand the precise regulation of gene expression. Currently annotated human α-SYN mRNA has a relatively long 3'UTR (2529 nucleotides [nt]) with several isoforms. RNA-sequencing and epigenomics data have suggested, however, the possible existence of even longer transcripts which extend beyond the annotated α-SYN 3'UTR sequence. Here, we have discovered the novel extended form of α-SYN 3'UTR (3775 nt) in the substantia nigra of human postmortem brain samples, induced pluripotent stem cell (iPSC)-derived dopaminergic neurons, and other human neuronal cell lines. Interestingly, the longer variant reduced α-SYN translation. The extended α-SYN 3'UTR was significantly lower in iPSC-derived dopaminergic neurons from sporadic PD patients than controls. On the other hand, α-SYN protein levels were much higher in PD cases, showing the strong negative correlation with the extended 3'UTR. These suggest that dysregulation of the extended α-SYN 3'UTR might contribute to the pathogenesis of PD.
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Affiliation(s)
- Goun Je
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL, USA
| | - Subhrangshu Guhathakurta
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL, USA
| | - Seung Pil Yun
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Adrienne Helis Malvin Medical Research Foundation, New Orleans, LA, USA
| | - Han Seok Ko
- Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Adrienne Helis Malvin Medical Research Foundation, New Orleans, LA, USA.,Diana Helis Henry Medical Research Foundation, New Orleans, LA, USA
| | - Yoon-Seong Kim
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL, USA. .,College of Medicine, Kyung-Hee University, Seoul, South Korea.
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16
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Barrie ES, Lee S, Frater JT, Kataki M, Scharre DW, Sadee W. Alpha-synuclein mRNA isoform formation and translation affected by polymorphism in the human SNCA 3'UTR. Mol Genet Genomic Med 2018; 6:565-574. [PMID: 29730891 PMCID: PMC6081226 DOI: 10.1002/mgg3.407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/02/2018] [Accepted: 04/05/2018] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Multiple variants in SNCA, encoding alpha-synuclein, a main component of Lewy bodies, are implicated in Parkinson's disease. METHODS We searched for cis-acting SNCA variants using allelic mRNA ratios in human brain tissues. In a SNCA 3'UTR (2,520 bp) luciferase reporter gene assay, translation in SH-SY5Y cells in the presence of the rs17016074 G/A alleles was measured. To assess clinical impact, we queried neurocognitive genome-wide association studies. RESULTS Allelic ratios deviated up to twofold, measured at a marker SNP in the middle of a long 3' untranslated region (3'UTR), but not at a marker at its start, suggesting regulation of 3'UTR processing. 3'UTR SNP rs17016074 G/A, minor allele frequency (MAF) <1% in Caucasians, 13% in Africans, strongly associates with large allelic mRNA expression imbalance (AEI), resulting in reduced expression of long 3'UTR isoforms. A second 3'UTR SNP (rs356165) associates with moderate AEI and enhances SNCA mRNA expression. The rs17016074 A allele reduces overall 3'UTR expression in luciferase reporter gene assays but supports more efficient translation, resolving previous contradictory results. We failed to detect significant genome-wide associations for rs17016074, possibly a result of low MAF in Caucasians or its absence from most genotyping panels. In the "Genome Wide Association Study of Yoruba in Nigeria," rs356165 was associated with reduced memory performance. CONCLUSIONS Here, we identify two cis-acting regulatory variants affecting SNCA mRNA expression, measured by allelic ratios in the 3'UTR. The rs17016074 minor A allele is associated with higher expression of luciferase protein activity. Resolving the genetic influence of SNCA polymorphisms requires study of the interactions between multiple regulatory variants with distinct frequencies among populations.
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Affiliation(s)
- Elizabeth S. Barrie
- Institute for Genomic MedicineNationwide Children's HospitalColumbusOhio
- Center for PharmacogenomicsDepartment of Cancer Biology and GeneticsCollege of MedicineThe Ohio State UniversityColumbusOhio
| | - Sung‐Ha Lee
- Center for PharmacogenomicsDepartment of Cancer Biology and GeneticsCollege of MedicineThe Ohio State UniversityColumbusOhio
| | - John T. Frater
- Center for PharmacogenomicsDepartment of Cancer Biology and GeneticsCollege of MedicineThe Ohio State UniversityColumbusOhio
| | - Maria Kataki
- Division of Cognitive NeurologyDepartment of NeurologyThe Ohio State University Wexner Medical CenterColumbusOhio
| | - Douglas W. Scharre
- Division of Cognitive NeurologyDepartment of NeurologyThe Ohio State University Wexner Medical CenterColumbusOhio
| | - Wolfgang Sadee
- Center for PharmacogenomicsDepartment of Cancer Biology and GeneticsCollege of MedicineThe Ohio State UniversityColumbusOhio
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17
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Fernández-Santiago R, Garrido A, Infante J, González-Aramburu I, Sierra M, Fernández M, Valldeoriola F, Muñoz E, Compta Y, Martí MJ, Ríos J, Tolosa E, Ezquerra M. α-synuclein (SNCA) but not dynamin 3 (DNM3) influences age at onset of leucine-rich repeat kinase 2 (LRRK2) Parkinson's disease in Spain. Mov Disord 2018; 33:637-641. [PMID: 29473656 DOI: 10.1002/mds.27295] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/10/2017] [Accepted: 12/08/2017] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVES A recent study showed that Arab-Berbers GG homozygous at rs2421947(C/G) in the dynamin 3 gene (DNM3) had 12.5 years earlier age at onset of leucine-rich repeat kinase 2 (LRRK2)-associated Parkinson's disease (PD) (L2PD). We explored whether this variant modulates the L2PD age at onset in Spain. METHODS We genotyped rs2421947 in 329 participants (210 L2PD patients, 119 L2PD nonmanifesting p.G2019S carriers), and marker rs356219 (A/G) in the α-synuclein gene (SNCA). RESULTS By Kaplan Meier and Cox regression analyses, we did not find an association of the DNM3 polymorphism with L2PD age at onset. However, we found an association of the SNCA marker with up to an 11 years difference in the L2PD median age at onset (58 years for GG carriers vs 69 years for AA). CONCLUSION Our results indicate that SNCA rs356219 but not dynamin 3 DNM3 rs2421947 modifies the penetrance of the mutation G2019S in the Spanish population by influencing the L2PD age at onset. These findings suggest that different genetic modifiers may influence the L2PD age at onset in different populations. © 2018 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Rubén Fernández-Santiago
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain
| | - Alicia Garrido
- Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - Jon Infante
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Santander, Spain
| | - Isabel González-Aramburu
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Santander, Spain
| | - María Sierra
- Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Universitario Marqués de Valdecilla, Universidad de Cantabria, Santander, Spain
| | - Manel Fernández
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - Francesc Valldeoriola
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - Esteban Muñoz
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - Yaroslau Compta
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - María-José Martí
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - José Ríos
- Medical Statistics Core Facility, Institut d'Investigacions Biomèdiques August Pi i Sunyer and Hospital Clinic, Barcelona, Spain.,Biostatistics Unit, Faculty of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Eduardo Tolosa
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain.,Movement Disorders Unit, Department of Neurology, Hospital Clínic de Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain
| | - Mario Ezquerra
- Laboratory of Parkinson Disease and Other Neurodegenerative Movement Disorders, Clinical and Experimental Research, Department of Neurology, Hospital Clínic of Barcelona, Institut d'Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas, Madrid, Spain
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18
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Patel N, Khan AO, Al-Saif M, Moghrabi WN, AlMaarik BM, Ibrahim N, Abdulwahab F, Hashem M, Alshidi T, Alobeid E, Alomar RA, Al-Harbi S, Abouelhoda M, Khabar KSA, Alkuraya FS. A novel mechanism for variable phenotypic expressivity in Mendelian diseases uncovered by an AU-rich element (ARE)-creating mutation. Genome Biol 2017; 18:144. [PMID: 28754144 PMCID: PMC5534118 DOI: 10.1186/s13059-017-1274-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/06/2017] [Indexed: 01/09/2023] Open
Abstract
Background Variable expressivity is a well-known phenomenon in which patients with mutations in one gene display varying degrees of clinical severity, potentially displaying only subsets of the clinical manifestations associated with the multisystem disorder linked to the gene. This remains an incompletely understood phenomenon with proposed mechanisms ranging from allele-specific to stochastic. Results We report three consanguineous families in which an isolated ocular phenotype is linked to a novel 3′ UTR mutation in SLC4A4, a gene known to be mutated in a syndromic form of intellectual disability with renal and ocular involvement. Although SLC4A4 is normally devoid of AU-rich elements (AREs), a 3′ UTR motif that mediates post-transcriptional control of a subset of genes, the mutation we describe creates a functional ARE. We observe a marked reduction in the transcript level of SLC4A4 in patient cells. Experimental confirmation of the ARE-creating mutation is shown using a post-transcriptional reporter system that reveals consistent reduction in the mRNA-half life and reporter activity. Moreover, the neo-ARE binds and responds to the zinc finger protein ZFP36/TTP, an ARE-mRNA decay-promoting protein. Conclusions This novel mutational mechanism for a Mendelian disease expands the potential mechanisms that underlie variable phenotypic expressivity in humans to also include 3′ UTR mutations with tissue-specific pathology.
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Affiliation(s)
- Nisha Patel
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Arif O Khan
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Eye Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, 112412, United Arab Emirates
| | - Maher Al-Saif
- Program in BioMolecular Research, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Walid N Moghrabi
- Program in BioMolecular Research, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Balsam M AlMaarik
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Niema Ibrahim
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Firdous Abdulwahab
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Mais Hashem
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Tarfa Alshidi
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Eman Alobeid
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Rana A Alomar
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Saad Al-Harbi
- King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
| | - Mohamed Abouelhoda
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
| | - Khalid S A Khabar
- Program in BioMolecular Research, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
| | - Fowzan S Alkuraya
- Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia. .,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia. .,Saudi Human Genome Program, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia.
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19
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Genetic Variants in SNCA and the Risk of Sporadic Parkinson's Disease and Clinical Outcomes: A Review. PARKINSONS DISEASE 2017; 2017:4318416. [PMID: 28781905 PMCID: PMC5525082 DOI: 10.1155/2017/4318416] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 04/17/2017] [Accepted: 05/24/2017] [Indexed: 12/14/2022]
Abstract
There is increasing evidence of the contribution of genetic susceptibility to the etiology of Parkinson's disease (PD). Genetic variations in the SNCA gene are well established by linkage and genome-wide association studies. Positive associations of single nucleotide polymorphisms (SNPs) in SNCA and increased risk for PD were found. However, the role of SNCA variants in individual traits or phenotypes of PD is unknown. Here, we reviewed the current literature and identified 57 studies, performed in fourteen different countries, that investigated SNCA variants and susceptibility to PD. We discussed the findings based on environmental factors, history of PD, clinical outcomes, and ethnicity. In conclusion, SNPs within the SNCA gene can modify the susceptibility to PD, leading to increased or decreased risk. The risk associations of some SNPs varied among samples. Of notice, no studies in South American or African populations were found. There is little information about the effects of these variants on particular clinical aspects of PD, such as motor and nonmotor symptoms. Similarly, evidence of possible interactions between SNCA SNPs and environmental factors or disease progression is scarce. There is a need to expand the clinical applicability of these data as well as to investigate the role of SNCA SNPs in populations with different ethnic backgrounds.
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20
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Deregulation of α-synuclein in Parkinson's disease: Insight from epigenetic structure and transcriptional regulation of SNCA. Prog Neurobiol 2017; 154:21-36. [PMID: 28445713 DOI: 10.1016/j.pneurobio.2017.04.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 01/19/2023]
Abstract
Understanding regulation of α-synuclein has long been a central focus for Parkinson's disease (PD) researchers. Accumulation of this protein in the Lewy body or neurites, mutations in the coding region of the gene and strong association of α-synuclein encoding gene multiplication (duplication/triplication) with familial form of PD have indicated the importance of this molecule in pathogenesis of the disease. Several years of research identified many potential faulty pathways associated with accumulation of α-synuclein inside dopaminergic neurons and its transmission to neighboring ones. Concurrently, an appreciable body of research is growing to understand the epigenetic and genetic deregulation of α-synuclein that might contribute to the disease pathology. Completion of the ENCODE (Encyclopedia of DNA Elements) project and recent advancement made in the epigenetic and trans factor mediated regulation of each gene, has tremendously accelerated the need to carefully understand the epigenetic structure of the gene (SNCA) encoding α-synuclein protein in order to decipher the regulation and contribution of α-synuclein to the pathogenesis of PD. We have also analyzed the detailed epigenetic structure of this gene with knowledge from ENCODE database, which may open new avenues in α-synuclein research. Interestingly, we have found that the gene contains several transcriptionally activate histone modifications and associated potential transcription factor binding sites in the non-coding areas that strongly suggest alternative regulatory pathways. Altogether this review will provide interesting insight of α-synuclein gene regulation from epigenetic, genetic and post-transcriptional perspectives and their potential implication in the PD pathogenesis.
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21
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Toffoli M, Dreussi E, Cecchin E, Valente M, Sanvilli N, Montico M, Gagno S, Garziera M, Polano M, Savarese M, Calandra-Buonaura G, Placidi F, Terzaghi M, Toffoli G, Gigli GL. SNCA 3′UTR genetic variants in patients with Parkinson’s disease and REM sleep behavior disorder. Neurol Sci 2017; 38:1233-1240. [DOI: 10.1007/s10072-017-2945-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Accepted: 04/01/2017] [Indexed: 11/28/2022]
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22
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Cooper CA, Jain N, Gallagher MD, Weintraub D, Xie SX, Berlyand Y, Espay AJ, Quinn J, Edwards KL, Montine T, Van Deerlin VM, Trojanowski J, Zabetian CP, Chen-Plotkin AS. Common variant rs356182 near SNCA defines a Parkinson's disease endophenotype. Ann Clin Transl Neurol 2016; 4:15-25. [PMID: 28078311 PMCID: PMC5221454 DOI: 10.1002/acn3.371] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 10/04/2016] [Indexed: 01/11/2023] Open
Abstract
Objective Parkinson's disease (PD) presents clinically with several motor subtypes that exhibit variable treatment response and prognosis. Here, we investigated genetic variants for their potential association with PD motor phenotype and progression. Methods We screened 10 SNPs, previously associated with PD risk, for association with tremor‐dominant (TD) versus postural‐instability gait disorder (PIGD) motor subtypes. SNPs that correlated with the TD/PIGD ratio in a discovery cohort of 251 PD patients were then evaluated in a multi‐site replication cohort of 559 PD patients. SNPs associated with motor phenotype in both cross‐sectional cohorts were next evaluated for association with (1) rates of motor progression in a longitudinal subgroup of 230 PD patients and (2) brain alpha‐synuclein (SNCA) expression in the GTEx (Genotype‐Tissue Expression project) consortium database. Results Genotype at rs356182, near SNCA, correlated with the TD/PIGD ratio in both the discovery (Bonferroni‐corrected P = 0.04) and replication cohorts (P = 0.02). The rs356182 GG genotype was associated with a more tremor‐predominant phenotype and predicted a slower rate of motor progression (1‐point difference in annual rate of UPDRS‐III motor score change, P = 0.01). The rs356182 genotype was associated with SNCA expression in the cerebellum (P = 0.005). Interpretation Our study demonstrates that the GG genotype at rs356182 provides molecular definition for a clinically important endophenotype associated with (1) more tremor‐predominant motor phenomenology, (2) slower rates of motor progression, and (3) decreased brain expression of SNCA. Such molecularly defined endophenotyping in PD may benefit both clinical trial design and tailoring of clinical care as we enter the era of precision medicine.
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Affiliation(s)
- Christine A Cooper
- Department of Neurology Medical University of South Carolina Charleston South Carolina; Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Nimansha Jain
- Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Michael D Gallagher
- Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Daniel Weintraub
- Department of Psychiatry Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Sharon X Xie
- Department of Biostatistics and Epidemiology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Yosef Berlyand
- Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania; Harvard Medical School Boston Massachusetts
| | - Alberto J Espay
- Department of Neurology University of Cincinnati Cincinnati Ohio
| | - Joseph Quinn
- Department of Neurology Oregon Health and Science University Portland Oregon
| | - Karen L Edwards
- Department of Epidemiology University of California Irvine Irvine California
| | - Thomas Montine
- Department of Pathology University of Washington Seattle Washington
| | - Vivianna M Van Deerlin
- Department of Pathology and Laboratory Medicine Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - John Trojanowski
- Department of Pathology and Laboratory Medicine Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
| | - Cyrus P Zabetian
- Department of Neurology VA Puget Sound Health Care System University of Washington Seattle Washington
| | - Alice S Chen-Plotkin
- Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania
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23
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Davis AA, Andruska KM, Benitez BA, Racette BA, Perlmutter JS, Cruchaga C. Variants in GBA, SNCA, and MAPT influence Parkinson disease risk, age at onset, and progression. Neurobiol Aging 2016; 37:209.e1-209.e7. [PMID: 26601739 PMCID: PMC4688052 DOI: 10.1016/j.neurobiolaging.2015.09.014] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 08/31/2015] [Accepted: 09/19/2015] [Indexed: 11/18/2022]
Abstract
Multiple genetic variants have been linked to risk of Parkinson disease (PD), but known mutations do not explain a large proportion of the total PD cases. Similarly, multiple loci have been associated with PD risk by genome-wide association studies (GWAS). The influence that genetic factors confer on phenotypic diversity remains unclear. Few studies have been performed to determine whether the GWAS loci are also associated with age at onset (AAO) or motor progression. We used 2 PD case-control data sets (Washington University and the Parkinson's Progression Markers Initiative) to determine whether polymorphisms located at the GWAS top hits (GBA, ACMSD/TMEM163, STK39, MCCC1/LAMP3, GAK/TMEM175, SNCA, and MAPT) show association with AAO or motor progression. We found associations between single nucleotide polymorphisms at the GBA and MAPT loci and PD AAO and progression. These findings reinforce the complex genetic basis of PD and suggest that distinct genes and variants explain the genetic architecture of PD risk, onset, and progression.
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Affiliation(s)
- Albert A Davis
- Department of Neurology, Washington University, St. Louis, MO, USA
| | | | - Bruno A Benitez
- Department of Psychiatry, Washington University, School of Medicine, St. Louis, MO, USA
| | - Brad A Racette
- Department of Neurology, Washington University, St. Louis, MO, USA; Hope Center Program on Protein Aggregation and Neurodegeneration, Washington University, St. Louis, MO, USA; School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Parktown, South Africa
| | - Joel S Perlmutter
- Department of Neurology, Washington University, St. Louis, MO, USA; Department of Radiology, Washington University, St. Louis, MO, USA; Department of Anatomy and Neurobiology, Washington University, St. Louis, MO, USA; Programs in Physical Therapy and Occupational Therapy, Washington University, St. Louis, MO, USA; Hope Center Program on Protein Aggregation and Neurodegeneration, Washington University, St. Louis, MO, USA
| | - Carlos Cruchaga
- Department of Psychiatry, Washington University, School of Medicine, St. Louis, MO, USA; Hope Center Program on Protein Aggregation and Neurodegeneration, Washington University, St. Louis, MO, USA.
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24
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SNCA Gene, but Not MAPT, Influences Onset Age of Parkinson's Disease in Chinese and Australians. BIOMED RESEARCH INTERNATIONAL 2015; 2015:135674. [PMID: 25960998 PMCID: PMC4413514 DOI: 10.1155/2015/135674] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 08/06/2014] [Accepted: 08/20/2014] [Indexed: 12/14/2022]
Abstract
Background. α-Synuclein (SNCA) and microtubule-associated protein tau (MAPT) are the two major genes independently, but not jointly, associated with susceptibility for Parkinson's disease (PD). The SNCA gene has recently been identified as a major modifier of age of PD onset. Whether MAPT gene synergistically influences age of onset of PD is unknown. Objective. To investigate independent and joint effects of MAPT and SNCA on PD onset age. Methods. 412 patients with PD were recruited from the Australian PD Research Network (123) and the Neurology Department, Ruijin Hospital Affiliated to Shanghai Jiaotong University, China (289). MAPT (rs17650901) tagging H1/H2 haplotype and SNCA (Rep1) were genotyped in the Australian cohort, and MAPT (rs242557, rs3744456) and SNCA (rs11931074, rs894278) were genotyped in the Chinese cohort. SPSS regression analysis was used to test genetic effects on age at onset of PD in each cohort. Results. SNCA polymorphisms associated with the onset age of PD in both populations. MAPT polymorphisms did not enhance such association in either entire cohort. Conclusion. This study suggests that, in both ethnic groups, SNCA gene variants influence the age at onset of PD and α-synuclein plays a key role in the disease course of PD.
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25
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Verstraeten A, Theuns J, Van Broeckhoven C. Progress in unraveling the genetic etiology of Parkinson disease in a genomic era. Trends Genet 2015; 31:140-9. [PMID: 25703649 DOI: 10.1016/j.tig.2015.01.004] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 01/21/2015] [Accepted: 01/22/2015] [Indexed: 01/30/2023]
Abstract
Parkinson disease (PD) and Parkinson-plus syndromes are genetically heterogeneous neurological diseases. Initial studies into the genetic causes of PD relied on classical molecular genetic approaches in well-documented case families. More recently, these approaches have been combined with exome sequencing and together have identified 15 causal genes. Additionally, genome-wide association studies (GWASs) have discovered over 25 genetic risk factors. Elucidation of the genetic architecture of sporadic and familial parkinsonism, however, has lagged behind that of simple Mendelian conditions, suggesting the existence of features confounding genetic data interpretation. Here we discuss the successes and potential pitfalls of gene discovery in PD and related disorders in the post-genomic era. With an estimated 30% of trait variance currently unexplained, tackling current limitations will further expedite gene discovery and lead to increased application of these genetic insights in molecular diagnostics using gene panel and exome sequencing strategies.
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Affiliation(s)
- Aline Verstraeten
- Neurodegenerative Brain Diseases Group, Department of Molecular Genetics, VIB, Antwerp, Belgium; Laboratory of Neurogenetics, Institute Born Bunge, University of Antwerp, Antwerp, Belgium
| | - Jessie Theuns
- Neurodegenerative Brain Diseases Group, Department of Molecular Genetics, VIB, Antwerp, Belgium; Laboratory of Neurogenetics, Institute Born Bunge, University of Antwerp, Antwerp, Belgium
| | - Christine Van Broeckhoven
- Neurodegenerative Brain Diseases Group, Department of Molecular Genetics, VIB, Antwerp, Belgium; Laboratory of Neurogenetics, Institute Born Bunge, University of Antwerp, Antwerp, Belgium.
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26
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Xu W, Tan L, Yu JT. Link between the SNCA gene and parkinsonism. Neurobiol Aging 2014; 36:1505-18. [PMID: 25554495 DOI: 10.1016/j.neurobiolaging.2014.10.042] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 10/30/2014] [Accepted: 10/31/2014] [Indexed: 12/11/2022]
Abstract
The groundbreaking discovery of mutations in the SNCA gene in a rare familial form of Parkinson's disease (PD) has revolutionized our basic understanding of the etiology of PD and other related disorders. Genome-wide Association Studies has demonstrated a wide array of single-nucleotide polymorphisms associated with the increasing risk of developing the more common type, sporadic PD, further corroborating the genetic etiology of PD. Among them, SNCA is a gene responsible for encoding α-synuclein, a protein found to be the major component of Lewy body and Lewy neurite, both of these components are the pathognomonic hallmarks of PD. Thus, it has been postulated that this gene plays specific roles in pathogenesis of PD. Here, we summarize the basic biological characteristics of the wild type of the protein (wt-α-synuclein) as well as genetic and epigenetic features of its encoding gene (SNCA) in PD. Based on these characteristics, SNCA may be involved in PD pathogenesis in at least 2 ways: wt-α-synuclein overexpression and its mutation types via different mechanisms. Associations between SNCA mutations and other Lewy body disorders, such as dementia with Lewy bodies and multiple system atrophy, are also mentioned. Finally, it is necessary to explore the influences which SNCA exerts on clinical and neuropathological phenotypes by promoting the transfer of scientific research into practice, such as clinical evaluation, diagnosis, and treatment of the disease. We believe it is promising to target SNCA for developing novel therapeutic strategies for parkinsonism.
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Affiliation(s)
- Wei Xu
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, Shandong Province, China
| | - Lan Tan
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, Shandong Province, China; Department of Neurology, Qingdao Municipal Hospital, College of Medicine and Pharmaceutics, Ocean University of China, Qingdao, Shandong Province, China; Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China.
| | - Jin-Tai Yu
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, Shandong Province, China; Department of Neurology, Qingdao Municipal Hospital, College of Medicine and Pharmaceutics, Ocean University of China, Qingdao, Shandong Province, China; Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing, Jiangsu Province, China.
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27
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Deng H, Yuan L. Genetic variants and animal models in SNCA and Parkinson disease. Ageing Res Rev 2014; 15:161-76. [PMID: 24768741 DOI: 10.1016/j.arr.2014.04.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 04/08/2014] [Accepted: 04/14/2014] [Indexed: 12/20/2022]
Abstract
Parkinson disease (PD; MIM 168600) is the second most common progressive neurodegenerative disorder characterized by a variety of motor and non-motor features. To date, at least 20 loci and 15 disease-causing genes for parkinsonism have been identified. Among them, the α-synuclein (SNCA) gene was associated with PARK1/PARK4. Point mutations, duplications and triplications in the SNCA gene cause a rare dominant form of PD in familial and sporadic PD cases. The α-synuclein protein, a member of the synuclein family, is abundantly expressed in the brain. The protein is the major component of Lewy bodies and Lewy neurites in dopaminergic neurons in PD. Further understanding of its role in the pathogenesis of PD through various genetic techniques and animal models will likely provide new insights into our understanding, therapy and prevention of PD.
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Affiliation(s)
- Hao Deng
- Center for Experimental Medicine and Department of Neurology, the Third Xiangya Hospital, Central South University, Tongzipo Road 138, Changsha, Hunan 410013, PR China.
| | - Lamei Yuan
- Center for Experimental Medicine and Department of Neurology, the Third Xiangya Hospital, Central South University, Tongzipo Road 138, Changsha, Hunan 410013, PR China
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28
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Cardo LF, Coto E, de Mena L, Ribacoba R, Mata IF, Menéndez M, Moris G, Alvarez V. Alpha-synuclein transcript isoforms in three different brain regions from Parkinson's disease and healthy subjects in relation to the SNCA rs356165/rs11931074 polymorphisms. Neurosci Lett 2014; 562:45-9. [DOI: 10.1016/j.neulet.2014.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 12/31/2013] [Accepted: 01/05/2014] [Indexed: 11/17/2022]
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29
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Tanner CM. Alpha-synuclein: one key opens many locks. Mov Disord 2013; 28:1176-8. [PMID: 23925937 DOI: 10.1002/mds.25596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 05/30/2013] [Accepted: 06/04/2013] [Indexed: 11/08/2022] Open
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30
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Li NN, Mao XY, Chang XL, Zhao DM, Zhang JH, Liao Q, Yu WJ, Tan EK, Peng R. SNCA rs356219 variant increases risk of sporadic Parkinson's disease in ethnic Chinese. Am J Med Genet B Neuropsychiatr Genet 2013; 162B:452-6. [PMID: 23737253 DOI: 10.1002/ajmg.b.32143] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 02/07/2013] [Indexed: 02/05/2023]
Abstract
Alpha-synuclein gene (SNCA) polymorphisms have been associated with Parkinson's disease (PD). A recently published genome-wide association study (GWAS) meta-analysis from the USA and Europe found a strong association between SNCA rs356219 and PD. Considering the population-specific heterogeneity, we investigated the role of SNCA rs356219 as PD susceptibility in a large Han Chinese population of 685 patients and 569 controls. The SNCA rs356219-G allele was found to increase the risk to develop PD (OR = 1.81, 95% CI: 1.54-2.13, P = 5.71E-13). The meta-analysis revealed that the frequency of AG + GG genotypes higher in PD than in control subjects (OR = 1.85, 95% CI: 1.56-2.19, P = 0.00001) in the Asian population. PD patients with AG + GG genotypes were associated with earlier age at onset compared with those with AA genotype. No such significant association was observed in the clinical presentation for gender, age at onset, and onset symptoms. Our study provides strong support for the susceptibility role of SNCA rs356219 in sporadic PD in a Han Chinese population from mainland China and the meta-analysis also revealed a similar finding in the Asian population.
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Affiliation(s)
- Nan-Nan Li
- Department of Neurology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, PR China
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Brockmann K, Schulte C, Hauser AK, Lichtner P, Huber H, Maetzler W, Berg D, Gasser T. SNCA: major genetic modifier of age at onset of Parkinson's disease. Mov Disord 2013; 28:1217-21. [PMID: 23674386 DOI: 10.1002/mds.25469] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/31/2013] [Accepted: 03/17/2013] [Indexed: 11/08/2022] Open
Abstract
Age at onset serves as a predictor of progression and mortality in sporadic Parkinson's disease (PD). Therefore, the identification of genetic modifiers for age at onset might lead to a better understanding of disease pathogenesis. We performed multivariate linear regression analysis in 1396 sporadic PD patients assessing 21 single-nucleotide polymorphisms (SNPs) that have been previously suggested to be associated with sporadic PD. Moreover, a cumulative risk score was assigned to each patient and correlated with age at onset. We identified the rs356219 risk allele in the SNCA gene as significantly contributing to earlier age at onset. Neither one of the other 21 SNPs tested in this analysis nor the cumulative number of risk alleles showed a significant impact on PD onset. Because sequence variants in the SNCA gene are not only associated with autosomal dominantly inherited PD and increased susceptibility for sporadic PD but also have been found to modify the phenotype such as age at onset in both sporadic and various monogenic forms of PD, this gene serves as an outstanding target for further research on PD pathogenesis, which in return might provide potential therapeutic options. © 2013 Movement Disorder Society.
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Affiliation(s)
- Kathrin Brockmann
- Department of Neurodegenerative Diseases, University of Tübingen, Tübingen, Germany.
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Abstract
In 2004 it was first shown that mutations in LRRK2 can cause Parkinson's disease. This initial discovery was quickly followed by the observation that a single particular mutation is a relatively common cause of Parkinson's disease across varied populations. Further genetic investigation has revealed a variety of genetic ties to Parkinson's disease across this gene. These include common alleles with quite broad effects on risk, likely through both alterations at the protein sequence level, and in the context of expression. A great deal of functional characterization of LRRK2 and disease-causing mutations in this protein has occurred over the last 9 years, and considerable progress has been made. Particular attention has been paid to the kinase activity of LRRK2 as a therapeutic target, and while it is no means certain that this is viable target it is likely that this hypothesis will be tested in clinical trials sooner rather than later. We believe that the future goals for LRRK2 research are, while challenging, relatively clear and that the next 10 years of research promises to be perhaps more exciting than the last.
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Affiliation(s)
- Coro Paisán-Ruiz
- Department of Neurology, Psychiatry, and Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, NY, USA
- Friedman Brain and Mindich Child Health and Development Institutes, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, NY, USA
| | - Patrick A. Lewis
- Department of Molecular Neuroscience, UCL Institute of Neurology, University College London, Queen Square, London, UK
- School of Pharmacy, University of Reading, Whiteknights, Reading, UK
| | - Andrew B. Singleton
- Laboratory of Neurogenetics, National Institute on Aging Intramural Research Program, Bethesda, MD, USA
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Botta-Orfila T, Ezquerra M, Pastor P, Fernández-Santiago R, Pont-Sunyer C, Compta Y, Lorenzo-Betancor O, Samaranch L, Martí MJ, Valldeoriola F, Calopa M, Fernández M, Aguilar M, de Fabregas O, Hernández-Vara J, Tolosa E. Age at onset in LRRK2-associated PD is modified by SNCA variants. J Mol Neurosci 2012; 48:245-7. [PMID: 22669510 DOI: 10.1007/s12031-012-9820-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 05/23/2012] [Indexed: 10/28/2022]
Abstract
Mutations in the leucine-rich repeat kinase 2 (LRRK2) and α-synuclein (SNCA) genes are known genetic causes of Parkinson's disease (PD). Recently, a genetic variant in SNCA has been associated with a lower age at onset in idiopathic PD (IPD). We genotyped the SNCA polymorphism rs356219 in 84 LRRK2-associated PD patients carrying the G2019S mutation. We found that a SNCA genetic variant is associated with an earlier age at onset in LRRK2-associated PD. Our results support the notion that SNCA variants can modify the pathogenic effect of LRRK2 mutations as described previously for IPD.
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Affiliation(s)
- Teresa Botta-Orfila
- Parkinson's Disease and Movement Disorders Unit, Neurology Service-Hospital Clínic, Institut de Neurociències and Department of Medicine, Universitat de Barcelona-Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
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Schmitt I, Wüllner U, van Rooyen JP, Khazneh H, Becker J, Volk A, Kubisch C, Becker T, Kostic VS, Klein C, Ramirez A. Variants in the 3'UTR of SNCA do not affect miRNA-433 binding and alpha-synuclein expression. Eur J Hum Genet 2012; 20:1265-9. [PMID: 22617348 DOI: 10.1038/ejhg.2012.84] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Alpha-synuclein (SNCA) is a major risk gene for Parkinson's disease (PD) and increased SNCA gene dosage results in a parkinsonian syndrome in affected families. Regulatory regions relevant for SNCA expression include the 3' untranslated region (UTR), which among other regulatory elements contains several micro-RNA-binding sites. Interestingly, variants located in the 3' region of SNCA have been associated with PD in two genome-wide association studies. To test whether private mutations in this region contribute to PD, we sequenced the 3'UTR of SNCA in 1285 PD patients and 1120 age/sex-matched healthy controls. We found two rare variants, the one corresponding to the single nucleotide polymorphism rs145304567 and the novel variant c.*1004_1008delTTTTT. Although rs145304567 affects the putative-binding site of microRNA (miRNA) -433, the allele distribution was similar in PD patients and controls, and the expression of SNCA mRNA was not related to the genotype. Furthermore, a regulatory effect of miRNA-433 on SNCA expression levels was not detected.
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Affiliation(s)
- Ina Schmitt
- Department of Neurology, University of Bonn, Bonn, Germany
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Ritz B, Rhodes SL, Bordelon Y, Bronstein J. α-Synuclein genetic variants predict faster motor symptom progression in idiopathic Parkinson disease. PLoS One 2012; 7:e36199. [PMID: 22615757 PMCID: PMC3352914 DOI: 10.1371/journal.pone.0036199] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 04/03/2012] [Indexed: 11/19/2022] Open
Abstract
Currently, there are no reported genetic predictors of motor symptom progression in Parkinson's disease (PD). In familial PD, disease severity is associated with higher α-synuclein (SNCA) expression levels, and in postmortem studies expression varies with SNCA genetic variants. Furthermore, SNCA is a well-known risk factor for PD occurrence. We recruited Parkinson's patients from the communities of three central California counties to investigate the influence of SNCA genetic variants on motor symptom progression in idiopathic PD. We repeatedly assessed this cohort of patients over an average of 5.1 years for motor symptom changes employing the Unified Parkinson's Disease Rating Scale (UPDRS). Of 363 population-based incident PD cases diagnosed less than 3 years from baseline assessment, 242 cases were successfully re-contacted and 233 were re-examined at least once. Of subjects lost to follow-up, 69% were due to death. Adjusting for covariates, risk of faster decline of motor function as measured by annual increase in motor UPDRS exam score was increased 4-fold in carriers of the REP1 263bp promoter variant (OR 4.03, 95%CI:1.57-10.4). Our data also suggest a contribution to increased risk by the G-allele for rs356165 (OR 1.66; 95%CI:0.96-2.88), and we observed a strong trend across categories when both genetic variants were considered (p for trend = 0.002). Our population-based study has demonstrated that SNCA variants are strong predictors of faster motor decline in idiopathic PD. SNCA may be a promising target for therapies and may help identify patients who will benefit most from early interventions. This is the first study to link SNCA to motor symptom decline in a longitudinal progression study.
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Affiliation(s)
- Beate Ritz
- Department of Epidemiology, University of California Los Angeles, Los Angeles, California, United States of America.
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