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Kablan A, Silan F, Ozdemir O. Re-evaluation of Genetic Variants in Parkinson's Disease Using Targeted Panel and Next-Generation Sequencing. Twin Res Hum Genet 2023; 26:164-170. [PMID: 37139776 DOI: 10.1017/thg.2023.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Parkinson's disease (PD) is a complex disorder with a significant genetic component. Genetic variations associated with PD play a crucial role in the disease's inheritance and prognosis. Currently, 31 genes have been linked to PD in the OMIM database, and the number of genes and genetic variations identified is steadily increasing. To establish a robust correlation between phenotype and genotype, it is essential to compare research findings with existing literature. In this study, we aimed to identify genetic variants associated with PD using a targeted gene panel with next-generation sequencing (NGS) technology. Our objective was also to explore the idea of re-analyzing genetic variants of unknown significance (VUS). We screened 18 genes known to be related to PD using NGS in 43 patients who visited our outpatient clinic between 2018-2019. After 12-24 months, we re-evaluated the detected variants. We found 14 different heterozygous variants classified as pathogenic, likely pathogenic, or VUS in 14 individuals from nonconsanguineous families. We re-evaluated 15 variants and found changes in their interpretation. Targeted gene panel analysis with NGS can help identify genetic variants associated with PD with confidence. Re-analyzing certain variants at specific time intervals can be especially beneficial in selected situations. Our study aims to expand the clinical and genetic understanding of PD and emphasizes the importance of re-analysis.
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Affiliation(s)
- Ahmet Kablan
- Department of Medical Genetics, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey
- Department of Medical Genetics, Sanliurfa Training and Research Hospital, Sanliurfa, Turkey
| | - Fatma Silan
- Department of Medical Genetics, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey
| | - Ozturk Ozdemir
- Department of Medical Genetics, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey
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Shadrina MI, Slominsky PA. Genetic Architecture of Parkinson's Disease. BIOCHEMISTRY. BIOKHIMIIA 2023; 88:417-433. [PMID: 37076287 DOI: 10.1134/s0006297923030100] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 03/28/2023]
Abstract
Year 2022 marks 25 years since the first mutation in familial autosomal dominant Parkinson's disease was identified. Over the years, our understanding of the role of genetic factors in the pathogenesis of familial and idiopathic forms of Parkinson's disease has expanded significantly - a number of genes for the familial form of the disease have been identified, and DNA markers for an increased risk of developing its sporadic form have been found. But, despite all the success achieved, we are far from an accurate assessment of the contribution of genetic and, even more so, epigenetic factors to the disease development. The review summarizes the information accumulated to date on the genetic architecture of Parkinson's disease and formulates issues that need to be addressed, which are primarily related to the assessment of epigenetic factors in the disease pathogenesis.
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Affiliation(s)
- Maria I Shadrina
- Institute of Molecular Genetics, Kurchatov Institute National Research Centre, Moscow, 123182, Russia.
| | - Petr A Slominsky
- Institute of Molecular Genetics, Kurchatov Institute National Research Centre, Moscow, 123182, Russia
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Meng J, Wang F, Ji L, Liang Y, Nian W, Song L, Zhu A. Comprehensive methylation profile of CSF cfDNA revealed pathogenesis and diagnostic markers for early-onset Parkinson's disease. Epigenomics 2021; 13:1637-1651. [PMID: 34664993 DOI: 10.2217/epi-2021-0176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Background: Early-onset Parkinson's disease (EOPD) is one uncommon Parkinson's disease subtype with characteristic clinicopathological features. The full epigenomic profile of EOPD is largely unknown. Methods: We performed the first study to investigate the EOPD full methylation profile of cerebrospinal fluid (CSF) cell-free DNA (cfDNA) from 26 EOPD patients and 10 control patients. Results: 2220 differentially methylated genes were identified in EOPD. Hypermethylation far outweighed hypomethylation in gene numbers. Clustering and enrichment analyses identified aberrant neuronal function and immune response. Weighted correlation network analysis demonstrated significant correlation between methylation signatures and clock drawing test (CDT), mini-mental state examination (MMSE), education, working status, alcohol drinking history and Hamilton anxiety scale (HAMA). Several key networking genes in EOPD aberrant methylation were also identified. Conclusions: The methylation profile and signatures of CSF cfDNA were revealed for the first time in EOPD. Aberrant methylation signatures were correlated with education, working status, alcohol drinking history, CDT, MMSE and HAMA.
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Affiliation(s)
- Jie Meng
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China.,Department of Neurology & State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, & Collaborative Innovation Center for Biotherapy, Chengdu, 610041, PR China
| | - Fenglin Wang
- Department of genetics and cell biology, College of Life Sciences, Nankai University, Tianjin, 300071, PR China
| | - Lei Ji
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China
| | - Yuhua Liang
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China
| | - Wei Nian
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China
| | - Lele Song
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China.,Department of Radiotherapy, The Eighth Medical Center of the Chinese PLA General Hospital, Beijing, 100091, PR China
| | - Aiqin Zhu
- Institution of Geriatric, Qinghai Provincial People's Hospital, Xining, 810007, PR China
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A new alpha-synuclein missense variant (Thr72Met) in two Turkish families with Parkinson's disease. Parkinsonism Relat Disord 2021; 89:63-72. [PMID: 34229155 PMCID: PMC8607441 DOI: 10.1016/j.parkreldis.2021.06.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/14/2021] [Accepted: 06/26/2021] [Indexed: 11/03/2022]
Abstract
Introduction: Missense variants and multiplications of the alpha-synuclein gene (SNCA) are established as rare causes of autosomal dominant forms of Parkinson’s Disease (PD). Methods: Two families of Turkish origins with PD were studied; the SNCA coding region was analyzed by Sanger sequencing, and by whole exome sequencing (WES) in the index patient of the first and the second family, respectively. Co-segregation studies and haplotype analysis across the SNCA locus were carried out. Functional studies included in vitro thioflavin-T aggregation assay and in silico structural modelling of the alpha-synuclein (α-syn) protein. Results: We identified a novel heterozygous SNCA variant, c.215C > T (p.Thr72Met), segregating with PD in a total of four members in the two families. A shared haplotype across the SNCA locus was found among variant carriers, suggestive of a common ancestor. We next showed that the Thr72Met α-syn displays enhanced aggregation in-vitro, compared to the wild-type species. In silico analysis of a tetrameric α-syn structural model revealed that Threonine 72 lies in the tetrameric interface, and substitution with the much larger methionine residue could potentially destabilize the tetramer. Conclusion: We present clinical, genetic, and functional data supporting a causative role of the SNCA c.215C > T (p.Thr72Met) variant in familial PD. Testing for this variant in patients with PD, especially of Turkish origin, might detect additional carriers. Further functional analyses might offer new insights into the shared biochemical properties of the PD-causing SNCA missense variants, and how they lead to neurodegeneration.
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Luukkainen L, Huttula S, Väyrynen H, Helisalmi S, Kytövuori L, Haapasalo A, Hiltunen M, Remes AM, Krüger J. Mutation Analysis of the Genes Associated with Parkinson's Disease in a Finnish Cohort of Early-Onset Dementia. J Alzheimers Dis 2021; 76:955-965. [PMID: 32568194 DOI: 10.3233/jad-200069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Alzheimer's disease, frontotemporal lobar degeneration, dementia with Lewy bodies, and Parkinson's disease (PD) overlap in clinical characteristics, neuropathology, and genetics. OBJECTIVE The aim of this study was to evaluate the role of pathogenic mutations and rare variants in genes associated with PD among early-onset dementia (EOD) patients. METHODS Rare non-synonymous variants (MAF < 0.01) in ten genes (SNCA, PARK2, PARK7, LRRK2, PINK1, ATP13A2, UCHL1, HTRA2, GBA, and SNCAIP) and low-frequency (MAF < 0.05) GBA variants were screened using a targeted next-generation sequencing panel in a strictly defined cohort of 37 early-onset (age at onset (AAO) <65 years) dementia patients presenting with atypical features (e.g., myoclonia or spasticity), rapidly progressive course of the disease or with a family history of dementia. The identified variations were further screened in a larger cohort of EOD (n = 279, mean AAO 57, range 36-65) patients. RESULTS No pathogenic mutations were found, but we identified seven possible risk variants for neurodegeneration (LRRK2 p.Arg793Met, PARK2 p.Ala82Glu, SNCAIP p.Arg240Gln, SNCAIP p.Phe369Leu, GBA p.Asn409Ser, GBA p.Glu365Lys, GBA p.Thr408Met). DISCUSSION Altogether, the frequency of these variants was two times higher in the first selected cohort compared to the whole cohort. This suggests that specific rare variants in the genes associated with PD might play a role also especially in familial EOD.
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Affiliation(s)
- Laura Luukkainen
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,Unit of Cancer and Translational Research, Pathology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
| | - Samuli Huttula
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
| | - Henri Väyrynen
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
| | - Seppo Helisalmi
- Institute of Clinical Medicine - Neurology, University of Eastern Finland, Kuopio, Finland
| | - Laura Kytövuori
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
| | - Annakaisa Haapasalo
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Mikko Hiltunen
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Anne M Remes
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
| | - Johanna Krüger
- Research Unit of Clinical Neuroscience, Neurology, University of Oulu, Oulu, Finland.,MRC, Oulu University Hospital, Oulu, Finland
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Clinical Study of 668 Indian Subjects with Juvenile, Young, and Early Onset Parkinson's Disease. Can J Neurol Sci 2021; 49:93-101. [PMID: 33685545 DOI: 10.1017/cjn.2021.40] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To determine the demographic pattern of juvenile-onset parkinsonism (JP, <20 years), young-onset (YOPD, 20-40 years), and early onset (EOPD, 40-50 years) Parkinson's disease (PD) in India. MATERIALS AND METHODS We conducted a 2-year, pan-India, multicenter collaborative study to analyze clinical patterns of JP, YOPD, and EOPD. All patients under follow-up of movement disorders specialists and meeting United Kingdom (UK) Brain Bank criteria for PD were included. RESULTS A total of 668 subjects (M:F 455:213) were recruited with a mean age at onset of 38.7 ± 8.1 years. The mean duration of symptoms at the time of study was 8 ± 6 years. Fifteen percent had a family history of PD and 13% had consanguinity. JP had the highest consanguinity rate (53%). YOPD and JP cases had a higher prevalence of consanguinity, dystonia, and gait and balance issues compared to those with EOPD. In relation to nonmotor symptoms, panic attacks and depression were more common in YOPD and sleep-related issues more common in EOPD subjects. Overall, dyskinesias were documented in 32.8%. YOPD subjects had a higher frequency of dyskinesia than EOPD subjects (39.9% vs. 25.5%), but they were first noted later in the disease course (5.7 vs. 4.4 years). CONCLUSION This large cohort shows differing clinical patterns in JP, YOPD, and EOPD cases. We propose that cutoffs of <20, <40, and <50 years should preferably be used to define JP, YOPD, and EOPD.
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Lubbe SJ, Bustos BI, Hu J, Krainc D, Joseph T, Hehir J, Tan M, Zhang W, Escott-Price V, Williams NM, Blauwendraat C, Singleton AB, Morris HR. Assessing the relationship between monoallelic PRKN mutations and Parkinson's risk. Hum Mol Genet 2021; 30:78-86. [PMID: 33448283 PMCID: PMC8033143 DOI: 10.1093/hmg/ddaa273] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 12/10/2020] [Accepted: 01/11/2021] [Indexed: 12/11/2022] Open
Abstract
Biallelic Parkin (PRKN) mutations cause autosomal recessive Parkinson’s disease (PD); however, the role of monoallelic PRKN mutations as a risk factor for PD remains unclear. We investigated the role of single heterozygous PRKN mutations in three large independent case-control cohorts totalling 10 858 PD cases and 8328 controls. Overall, after exclusion of biallelic carriers, single PRKN mutations were more common in PD than controls conferring a >1.5-fold increase in the risk of PD [P-value (P) = 0.035], with meta-analysis (19 574 PD cases and 468 488 controls) confirming increased risk [Odds ratio (OR) = 1.65, P = 3.69E-07]. Carriers were shown to have significantly younger ages at the onset compared with non-carriers (NeuroX: 56.4 vs. 61.4 years; exome: 38.5 vs. 43.1 years). Stratifying by mutation type, we provide preliminary evidence for a more pathogenic risk profile for single PRKN copy number variant (CNV) carriers compared with single nucleotide variant carriers. Studies that did not assess biallelic PRKN mutations or consist of predominantly early-onset cases may be biasing these estimates, and removal of these resulted in a loss of association (OR = 1.23, P = 0.614; n = 4). Importantly, when we looked for additional CNVs in 30% of PD cases with apparent monoallellic PRKN mutations, we found that 44% had biallelic mutations, suggesting that previous estimates may be influenced by cryptic biallelic mutation status. While this study supports the association of single PRKN mutations with PD, it highlights confounding effects; therefore, caution is needed when interpreting current risk estimates. Together, we demonstrate that comprehensive assessment of biallelic mutation status is essential when elucidating PD risk associated with monoallelic PRKN mutations.
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Affiliation(s)
- Steven J Lubbe
- Ken and Ruth Davee Department of Neurology and Simpson Querrey Center for Neurogenetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Bernabe I Bustos
- Ken and Ruth Davee Department of Neurology and Simpson Querrey Center for Neurogenetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Jing Hu
- Ken and Ruth Davee Department of Neurology and Simpson Querrey Center for Neurogenetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Dimitri Krainc
- Ken and Ruth Davee Department of Neurology and Simpson Querrey Center for Neurogenetics, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Theresita Joseph
- Department of Clinical and Movement Neurosciences, and UCL Movement Disorders Centre, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
| | - Jason Hehir
- National Hospital for Neurology and Neurosurgery, Queen Square, London, UK
| | - Manuela Tan
- Department of Clinical and Movement Neurosciences, and UCL Movement Disorders Centre, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
| | - Weijia Zhang
- Department of Clinical and Movement Neurosciences, and UCL Movement Disorders Centre, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
| | - Valentina Escott-Price
- Institute of Psychological Medicine and Clinical Neurosciences, Medical Research Council Centre for Neuropsychiatric Genetics and Genomics, Cardiff University School of Medicine, Cardiff, CF24 4HQ, UK.,Dementia Research Institute at Cardiff, Cardiff University, Cardiff, CF24 4HQ, UK
| | - Nigel M Williams
- Institute of Psychological Medicine and Clinical Neurosciences, Medical Research Council Centre for Neuropsychiatric Genetics and Genomics, Cardiff University School of Medicine, Cardiff, CF24 4HQ, UK
| | - Cornelis Blauwendraat
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892, USA
| | - Andrew B Singleton
- Molecular Genetics Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892, USA
| | - Huw R Morris
- Department of Clinical and Movement Neurosciences, and UCL Movement Disorders Centre, Queen Square Institute of Neurology, University College London, London, WC1N 3BG, UK
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Eryilmaz IE, Erer S, Zarifoglu M, Egeli U, Karakus E, Yurdacan B, Cecener G, Tunca B, Colakoglu B, Bora Tokcaer A, Saka E, Demirkiran M, Akbostanci C, Dogu O, Kaleagasi H, Kenangil G, Cakmur R, Elibol B. Contribution of functional dopamine D2 and D3 receptor variants to motor and non-motor symptoms of early onset Parkinson's disease. Clin Neurol Neurosurg 2020; 199:106257. [PMID: 33039854 DOI: 10.1016/j.clineuro.2020.106257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 08/12/2020] [Accepted: 09/28/2020] [Indexed: 01/29/2023]
Abstract
In the present study, we focused on investigating the contribution of functional dopamine D2 and D3 receptor variants to motor and/or non-motor symptoms of early onset Parkinson's disease (EOPD). Three functional single nucleotide polymorphisms (SNPs), DRD3 rs6280, DRD2 rs2283265 and DRD2 rs1076560, were genotyped in 128 Turkish EOPD patients and then, statistical analysis was conducted for the potential impacts of SNPs on clinical parameters. All three SNPs were found to be statistically significant in terms of PD-related pain: DRD3 [rs6280; risk allele "T" for pain; p = 0.031; odds ratio (OR)=4.25], DRD2 [rs2283265; risk allele "A" for pain; p = 0.001; OR=8.47] and, DRD2 [rs1076560; risk allele "A" for pain; p = 0.022; OR=4.58]. Additionally, bilateral disease [p = 0.011; OR=5.10] and gender [risk group "female"; p = 0.003; OR=8.53] were also identified as significant univariate risk factors for PD-related pain. Based on logistic regression analysis conducted with the significant univariate risk factors, this the first report to clarify that a female patient with bilateral PD and DRD2 rs2283265 polymorphism has a significant risk for PD-related pain. Our findings might contribute to improve life quality by offering treatment options for pain in PD patients with these clinical and genetic features.
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Affiliation(s)
- Isil Ezgi Eryilmaz
- Bursa Uludag University, Faculty of Medicine, Medical Biology Department, Bursa, Turkey
| | - Sevda Erer
- Bursa Uludag University, Faculty of Medicine, Neurology Department, Bursa, Turkey.
| | - Mehmet Zarifoglu
- Bursa Uludag University, Faculty of Medicine, Neurology Department, Bursa, Turkey
| | - Unal Egeli
- Bursa Uludag University, Faculty of Medicine, Medical Biology Department, Bursa, Turkey
| | - Ece Karakus
- Bursa Uludag University, Faculty of Medicine, Bursa, Turkey
| | - Beste Yurdacan
- Bursa Uludag University, Faculty of Medicine, Medical Biology Department, Bursa, Turkey
| | - Gulsah Cecener
- Bursa Uludag University, Faculty of Medicine, Medical Biology Department, Bursa, Turkey
| | - Berrin Tunca
- Bursa Uludag University, Faculty of Medicine, Medical Biology Department, Bursa, Turkey
| | - Beril Colakoglu
- Dokuz Eylul University, Faculty of Medicine, Neurology Department, Izmir, Turkey
| | - Ayse Bora Tokcaer
- Gazi University, Faculty of Medicine, Neurology Department, Ankara, Turkey
| | - Esen Saka
- Hacettepe University, Faculty of Medicine, Neurology Department, Ankara, Turkey
| | - Meltem Demirkiran
- Cukurova University, Faculty of Medicine, Neurology Department, Adana, Turkey
| | - Cenk Akbostanci
- Ankara University, Faculty of Medicine, Neurology Department, Ankara, Turkey
| | - Okan Dogu
- Mersin University, Faculty of Medicine, Neurology Department, Mersin, Turkey
| | - Hakan Kaleagasi
- Mersin University, Faculty of Medicine, Neurology Department, Mersin, Turkey
| | - Gulay Kenangil
- BAU Medical Park Goztepe, Neurology Department, İstanbul, Turkey
| | - Raif Cakmur
- Dokuz Eylul University, Faculty of Medicine, Neurology Department, Izmir, Turkey
| | - Bulent Elibol
- Hacettepe University, Faculty of Medicine, Neurology Department, Ankara, Turkey
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Genetic predispositions of Parkinson's disease revealed in patient-derived brain cells. NPJ PARKINSONS DISEASE 2020; 6:8. [PMID: 32352027 PMCID: PMC7181694 DOI: 10.1038/s41531-020-0110-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 03/20/2020] [Indexed: 12/14/2022]
Abstract
Parkinson's disease (PD) is the second most prevalent neurological disorder and has been the focus of intense investigations to understand its etiology and progression, but it still lacks a cure. Modeling diseases of the central nervous system in vitro with human induced pluripotent stem cells (hiPSC) is still in its infancy but has the potential to expedite the discovery and validation of new treatments. Here, we discuss the interplay between genetic predispositions and midbrain neuronal impairments in people living with PD. We first summarize the prevalence of causal Parkinson's genes and risk factors reported in 74 epidemiological and genomic studies. We then present a meta-analysis of 385 hiPSC-derived neuronal lines from 67 recent independent original research articles, which point towards specific impairments in neurons from Parkinson's patients, within the context of genetic predispositions. Despite the heterogeneous nature of the disease, current iPSC models reveal converging molecular pathways underlying neurodegeneration in a range of familial and sporadic forms of Parkinson's disease. Altogether, consolidating our understanding of robust cellular phenotypes across genetic cohorts of Parkinson's patients may guide future personalized drug screens in preclinical research.
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10
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DJ-1 in Parkinson's Disease: Clinical Insights and Therapeutic Perspectives. J Clin Med 2019; 8:jcm8091377. [PMID: 31484320 PMCID: PMC6780414 DOI: 10.3390/jcm8091377] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 08/29/2019] [Accepted: 08/30/2019] [Indexed: 12/13/2022] Open
Abstract
Mutations in the protein DJ-1 cause autosomal recessive forms of Parkinson’s disease (PD) and oxidized DJ-1 is found in the brains of idiopathic PD individuals. While several functions have been ascribed to DJ-1 (most notably protection from oxidative stress), its contribution to PD pathogenesis is not yet clear. Here we provide an overview of the clinical research to date on DJ-1 and the current state of knowledge regarding DJ-1 characterization in the human brain. The relevance of DJ-1 as a PD biomarker is also discussed, as are studies exploring DJ-1 as a possible therapeutic target for PD and neurodegeneration.
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11
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Sharma N, Rao SP, Kalivendi SV. The deglycase activity of DJ-1 mitigates α-synuclein glycation and aggregation in dopaminergic cells: Role of oxidative stress mediated downregulation of DJ-1 in Parkinson's disease. Free Radic Biol Med 2019; 135:28-37. [PMID: 30796974 DOI: 10.1016/j.freeradbiomed.2019.02.014] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 02/13/2019] [Accepted: 02/13/2019] [Indexed: 12/20/2022]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder associated with the degeneration of dopamine neurons of the substantia nigra pars compacta (SNpc) and the presence of intra-neuronal aggregates of α-synuclein and its post-translational products. Based on emerging reports on the association between glycated α-synuclein and PD; and the newly identified deglycase activity of DJ-1, we sought to find the relevance of deglycase activity of DJ-1 on glycation of α-synuclein and its plausible role in PD. Our results demonstrate that DJ-1 has a higher affinity towards the substrate methylglyoxal (MGO) (Km = 900 mM) as compared to its familial mutant, L166P (Km = 1900 mM). Also, CML α-synuclein (CML-syn) served as a substrate for the deglycase activity of DJ-1. Treatment of cells with Parkinsonian mimetic, 1-methyl-4-phenylpyridinium ion (MPP+); oxidants, such as H2O2 and methylglyoxal (MGO) lead to a dose-dependent decrease in the levels of DJ-1 with a concomitant increase in CML-syn. Also, MGO induced cytosolic α-synuclein aggregates in cells which stained positive with the anti-CML antibody. Further, unilateral stereotaxic administration of MGO into the SNpc of mice induced α-synuclein aggregates and CML-syn with a concomitant reduction in the number of TH positive neurons, protein levels of TH and DJ-1 at the site of injection. Interestingly, overexpression of DJ-1 enhanced the clearance of preformed CML-syn in cells, mitigated MGO induced CML-syn and intracellular α-synuclein aggregates. Overall, the findings of our present study demonstrate that DJ-1 plays a pivotal role in the glycation and aggregation of α-synuclein. Reduced DJ-1 activity due to mutations or oxidative stress may lead to the accumulation of glycated α-synuclein and its aggregates.
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Affiliation(s)
- Neelam Sharma
- Biochemistry Laboratory, Department of Applied Biology, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Uppal Road, Hyderabad, 500007, T.S., India; Academy of Scientific and Innovative Research (AcSIR), CSIR- Human Resource Development Centre, (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Swetha Pavani Rao
- Biochemistry Laboratory, Department of Applied Biology, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Uppal Road, Hyderabad, 500007, T.S., India; Academy of Scientific and Innovative Research (AcSIR), CSIR- Human Resource Development Centre, (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201 002, India
| | - Shasi V Kalivendi
- Biochemistry Laboratory, Department of Applied Biology, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Uppal Road, Hyderabad, 500007, T.S., India; Academy of Scientific and Innovative Research (AcSIR), CSIR- Human Resource Development Centre, (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201 002, India.
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12
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Fang YQ, Mao F, Zhu MJ, Li XH. Compound heterozygous mutations in PARK2 causing early-onset Parkinson disease: A case report. Medicine (Baltimore) 2019; 98:e14228. [PMID: 30702579 PMCID: PMC6380659 DOI: 10.1097/md.0000000000014228] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
RATIONALE Parkinson disease (PD) is a complex neurodegenerative movement disorder characterized by resting tremor, muscular rigidity, bradykinesia, and so on. Genetics has been regarded as an important role in the development of PD. PARK2, an autosomal recessive gene, is the most common one referring to early-onset Parkinson disease (EOPD). Strangely, only a single heterozygous mutation in PARK2 was found in a small minority of patients with PD, which has been reported quite rarely and is difficult to explain. PATIENT CONCERNS We described a case of 36-year-old male patient, complaining of progressive tremor for 10 years. He 1st presented uncontrolled resting tremor of his left arm. Besides, he also had trouble in completing fine motor tasks such as writing and buttoning. Six years later, tremor of the ipsilateral leg gradually occurred. On neurologic examinations, pronounced parkinsonian symptoms were noted, including resting tremor, body bradykinesia, and hypomimia. The positron emission tomography-computed tomography showed the distribution of dopamine transporter in both putamens decreased obviously. No family history was indentified. He came to hospital because his disease aggravated in the past 4 months. DIAGNOSIS This patient was diagnosed with PD according to the movement disorder society clinical diagnostic criteria for PD. INTERVENTIONS AND OUTCOMES With regard to the sequencing of this patient, a heterozygous point mutation of G403C in PARK2 was detected, which was inherited from his unaffected mother, leading to an amino acid alternation of glycine to arginine. Furthermore, deletion mutation of exon 6 in PARK2 was also found in this patient, which was inherited from his normal father. He accepted madopar and benzhexol and showed stable efficacy. To our knowledge, it is the 1st case report to explain the synergistic action of both heterozygous pathogenic point mutation in PARK2 and deletion mutation of exon 6 leading to EOPD. LESSONS Compound heterozygous mutations in PARK2 with point mutation of G403C and deletion mutation of exon 6 might contribute to the development of EOPD.
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Youn J, Lee C, Oh E, Park J, Kim JS, Kim HT, Cho JW, Park WY, Jang W, Ki CS. Genetic variants of PARK genes in Korean patients with early-onset Parkinson's disease. Neurobiol Aging 2018; 75:224.e9-224.e15. [PMID: 30502028 DOI: 10.1016/j.neurobiolaging.2018.10.030] [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: 08/11/2018] [Revised: 10/22/2018] [Accepted: 10/31/2018] [Indexed: 12/18/2022]
Abstract
Early-onset Parkinson's disease (EOPD) can be linked to different genetic backgrounds depending on the disease characteristics. In Korean patients with EOPD, however, only 5 PARK genes have been tested. We recruited 70 patients with EOPD from 4 hospitals in Korea, and 12 PARK genes were screened via multigene panel sequencing. Large insertions or deletions were confirmed by multiplex ligation-dependent probe amplification. We found 20 rare variants (2 in SNCA, 2 in PRKN, 6 in LRRK2, 3 in PINK1, 1 in DJ1, 4 in FBX07, 1 in HTRA2, and 1 in EIG4G1) in 20 subjects regardless of heterogeneity. Two pathogenic variants (SNCA in 2 subjects and DJ1 in one) were from 3 subjects, and 7 likely pathogenic variants (SNCA, LRRK2, FBXO7, and 2 in PINK1 and PRKN) from 7. Akinetic-rigid subtype and dystonia were more common in patients with EOPD with rare variants than in those without rare variants. Multigene panel tests can be effective at identifying genetic variants in patients with EOPD. In addition, we suggest there are different genetic backgrounds in patients with EOPD.
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Affiliation(s)
- Jinyoung Youn
- Department of Neurology, Samsung Medical Center, Seoul, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Neuroscience Center, Samsung Medical Center, Seoul, Republic of Korea
| | - Chung Lee
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea; Samsung Genome Institute, Samsung Medical Center, Seoul, Republic of Korea
| | - Eungseok Oh
- Department of Neurology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Republic of Korea
| | - Jinse Park
- Department of Neurology, Inje University, Haeundae Paik Hospital, Busan, Republic of Korea
| | - Ji Sun Kim
- Department of Neurology, Samsung Medical Center, Seoul, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Neuroscience Center, Samsung Medical Center, Seoul, Republic of Korea
| | - Hee-Tae Kim
- Department of Neurology, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Jin Whan Cho
- Department of Neurology, Samsung Medical Center, Seoul, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea; Neuroscience Center, Samsung Medical Center, Seoul, Republic of Korea
| | - Woong-Yang Park
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea; Samsung Genome Institute, Samsung Medical Center, Seoul, Republic of Korea; Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Gyeonggi-do, Republic of Korea
| | - Wooyoung Jang
- Department of Neurology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Gangwon-do, Republic of Korea.
| | - Chang-Seok Ki
- Green Cross Genome, Yongin, Gyeonggi-do, Republic of Korea.
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Han T, Liu M, Yang S. DJ-1 Alleviates Angiotensin II-Induced Endothelial Progenitor Cell Damage by Activating the PPARγ/HO-1 Pathway. J Cell Biochem 2018; 119:392-400. [PMID: 28600848 DOI: 10.1002/jcb.26191] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Accepted: 06/05/2017] [Indexed: 01/06/2023]
Abstract
There is evidence that angiotensin II (Ang II) may impair the functions of endothelial progenitor cells (EPCs). It was revealed that DJ-1 could resist oxidative stress. In this study, we investigated whether DJ-1 could protect EPCs against Ang II-induced cell damage. The proliferation and migration of EPCs were strongly reduced in the Ang II group and were increased by overexpression of DJ-1. Western blotting indicated that the increased expression of the senescence marker β-galactosidase and decreased expression of adhesion molecules (ICAM-1, VCAM-1) induced by Ang II were reversed after Ad-DJ-1 transfection. The reduced angiogenic capacity of EPCs caused by Ang II was also improved after Ad-DJ-1 transfection. Moreover, Ang II significantly increased the levels of reactive oxygen species (ROS), malondialdehyde (MDA), and inflammatory cytokines (TNF-α and IL-1β), reduced the levels of superoxide dismutase (SOD), glutathione (GSH), and these were reversed by Ad-DJ-1 transfection. Expression of peroxisome proliferator-activated receptor-γ (PPARγ) and heme oxygenase (HO-1) was increased by DJ-1. Therefore, HO-1 siRNA were constructed and transfected into EPCs, and the results showed that HO-1 siRNA transfection inhibited the effects of DJ-1 on EPC function. Thus, our study implies that DJ-1 may protect EPCs against Ang II-induced dysfunction by activating the PPARγ/HO-1. J. Cell. Biochem. 119: 392-400, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Tao Han
- Department of Vascular Surgery, China-Japan Union Hospital, Jilin University, Changchun, 130033,, Jilin, China
| | - Meihan Liu
- Department of Ultrasonography, China-Japan Union Hospital, Jilin University, Changchun, 130033,, Jilin, China
| | - Songbai Yang
- Department of Vascular Surgery, China-Japan Union Hospital, Jilin University, Changchun, 130033,, Jilin, China
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Kessler C, Atasu B, Hanagasi H, Simón-Sánchez J, Hauser AK, Pak M, Bilgic B, Erginel-Unaltuna N, Gurvit H, Gasser T, Lohmann E. Role of LRRK2 and SNCA in autosomal dominant Parkinson's disease in Turkey. Parkinsonism Relat Disord 2017; 48:34-39. [PMID: 29248340 DOI: 10.1016/j.parkreldis.2017.12.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 12/04/2017] [Accepted: 12/08/2017] [Indexed: 12/17/2022]
Abstract
INTRODUCTION Mutations in the LRRK2 and alpha-synuclein (SNCA) genes are well-established causes of autosomal dominant Parkinson's disease (PD). However, their frequency differs widely between ethnic groups. Only three studies have screened all coding regions of LRRK2 and SNCA in European samples so far. In Turkey, the role of LRRK2 in Parkinson's disease has been studied fragmentarily, and the incidence of SNCA copy number variations is unknown. The purpose of this study is to determine the frequency of LRRK2 and SNCA mutations in autosomal dominant PD in Turkey. METHODS We performed Sanger sequencing of all coding LRRK2 and SNCA exons in a sample of 91 patients with Parkinsonism. Copy number variations in SNCA, PRKN, PINK1, DJ1 and ATP13A2 were assessed using the MLPA method. All patients had a positive family history compatible with autosomal dominant inheritance. RESULTS Known mutations in LRRK2 and SNCA were found in 3.3% of cases: one patient harbored the LRRK2 G2019S mutation, and two patients carried a SNCA gene duplication. Furthermore, we found a heterozygous deletion of PRKN exon 2 in one patient, and four rare coding variants of unknown significance (LRRK2: A211V, R1067Q, T2494I; SNCA: T72T). Genetic testing in one affected family identified the LRRK2 R1067Q variant as a possibly pathogenic substitution. CONCLUSION Point mutations in LRRK2 and SNCA are a rare cause of autosomal dominant PD in Turkey. However, copy number variations should be considered. The unclassified variants, especially LRRK2 R1067Q, demand further investigation.
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Affiliation(s)
- Christoph Kessler
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Burcu Atasu
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Hasmet Hanagasi
- Behavioural Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | | | - Ann-Kathrin Hauser
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Meltem Pak
- Behavioural Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Basar Bilgic
- Behavioural Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | | | - Hakan Gurvit
- Behavioural Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Thomas Gasser
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany; German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Ebba Lohmann
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany; German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany; Behavioural Neurology and Movement Disorders Unit, Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.
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Eryilmaz IE, Cecener G, Erer S, Egeli U, Tunca B, Zarifoglu M, Elibol B, Bora Tokcaer A, Saka E, Demirkiran M, Akbostanci C, Dogu O, Colakoglu B, Kenangil G, Kaleagasi H. Epigenetic approach to early-onset Parkinson's disease: low methylation status of SNCA and PARK2 promoter regions. Neurol Res 2017; 39:965-972. [PMID: 28830306 DOI: 10.1080/01616412.2017.1368141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Background and aim The effect of epigenetic modifications in the genes related to Parkinson's disease (PD) is still unclear. In the present study, we investigated methylation status of SNCA and PARK2 genes in patients with early-onset Parkinson's disease (EOPD). Materials and methods The promoter region methylation status of SNCA and PARK2 genes was evaluated by methylation specific-PCR (MSP) in 91 patients with EOPD and 52 healthy individuals. Results The methylation of SNCA and PARK2 promoter regions were significantly lower in EOPD patients compared to the control group (P = 0.013 and P = 0.03, respectively). We also found that the methylation status of the SNCA might be associated with positive family history of PD (P = 0.042). Conclusion Although it should be supported by further analysis, based on the results of the present study, the methylation status of SNCA and PARK2 genes might contribute to EOPD pathogenesis.
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Affiliation(s)
- Isil Ezgi Eryilmaz
- a Faculty of Medicine, Department of Medical Biology , Uludag University , Bursa , Turkey
| | - Gulsah Cecener
- a Faculty of Medicine, Department of Medical Biology , Uludag University , Bursa , Turkey
| | - Sevda Erer
- b Faculty of Medicine, Department of Neurology , Uludag University , Bursa , Turkey
| | - Unal Egeli
- a Faculty of Medicine, Department of Medical Biology , Uludag University , Bursa , Turkey
| | - Berrin Tunca
- a Faculty of Medicine, Department of Medical Biology , Uludag University , Bursa , Turkey
| | - Mehmet Zarifoglu
- a Faculty of Medicine, Department of Medical Biology , Uludag University , Bursa , Turkey
| | - Bulent Elibol
- c Faculty of Medicine, Department of Neurology , Hacettepe University , Ankara , Turkey
| | - Ayse Bora Tokcaer
- d Faculty of Medicine, Department of Neurology , Gazi University , Ankara , Turkey
| | - Esen Saka
- c Faculty of Medicine, Department of Neurology , Hacettepe University , Ankara , Turkey
| | - Meltem Demirkiran
- e Faculty of Medicine, Department of Neurology , Cukurova University , Adana , Turkey
| | - Cenk Akbostanci
- f Faculty of Medicine, Department of Neurology , Ankara University , Ankara , Turkey
| | - Okan Dogu
- g Faculty of Medicine, Department of Neurology , Mersin University , Mersin , Turkey
| | - Beril Colakoglu
- h Faculty of Medicine, Department of Neurology , Dokuz Eylul University , Izmir , Turkey
| | - Gulay Kenangil
- i Erenkoy Training and Research Hospital for Neurologic and Psychiatric Disease , Istanbul , Turkey
| | - Hakan Kaleagasi
- g Faculty of Medicine, Department of Neurology , Mersin University , Mersin , Turkey
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Kasten M, Marras C, Klein C. Nonmotor Signs in Genetic Forms of Parkinson's Disease. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2017; 133:129-178. [DOI: 10.1016/bs.irn.2017.05.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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