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Sökning: WFRF:(Wirdefeldt Karin)

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  • Bruder, Carl E G, et al. (författare)
  • Phenotypically concordant and discordant monozygotic twins display different DNA copy-number-variation profiles
  • 2008
  • Ingår i: American Journal of Human Genetics. - : Elsevier BV. - 0002-9297 .- 1537-6605. ; 82:3, s. 763-71
  • Tidskriftsartikel (refereegranskat)abstract
    • The exploration of copy-number variation (CNV), notably of somatic cells, is an understudied aspect of genome biology. Any differences in the genetic makeup between twins derived from the same zygote represent an irrefutable example of somatic mosaicism. We studied 19 pairs of monozygotic twins with either concordant or discordant phenotype by using two platforms for genome-wide CNV analyses and showed that CNVs exist within pairs in both groups. These findings have an impact on our views of genotypic and phenotypic diversity in monozygotic twins and suggest that CNV analysis in phenotypically discordant monozygotic twins may provide a powerful tool for identifying disease-predisposition loci. Our results also imply that caution should be exercised when interpreting disease causality of de novo CNVs found in patients based on analysis of a single tissue in routine disease-related DNA diagnostics.
  • Chung, Sun Ju, et al. (författare)
  • Alpha-Synuclein Repeat Variants and Survival in Parkinson's Disease
  • 2014
  • Ingår i: Movement Disorders. - : John Wiley & Sons Inc.. - 0885-3185. ; 29:8, s. 1053-1057
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: To determine whether alpha-synuclein dinucleotide repeat (REP1) genotypes are associated with survival in Parkinson's disease (PD). Methods: Investigators from the Genetic Epidemiology of Parkinson's Disease Consortium provided REP1 genotypes and baseline and follow-up clinical data for cases. The primary outcome was time to death. Cox proportional hazards regression models were used to assess the association of REP1 genotypes with survival. Results: Twenty-one sites contributed data for 6,154 cases. There was no significant association between alpha-synuclein REP1 genotypes and survival in PD. However, there was a significant association between REP1 genotypes and age at onset of PD (hazard ratio: 1.06; 95% confidence interval: 1.01-1.10; P value = 0.01). Conclusions: In our large consortium study, alpha-synuclein REP1 genotypes were not associated with survival in PD. Further studies of alpha-synuclein's role in disease progression and long-term outcomes are needed. (C) 2014 International Parkinson and Movement Disorder Society
  • Elbaz, Alexis, et al. (författare)
  • Independent and Joint Effects of the MAPT and SNCA Genes in Parkinson Disease
  • 2011
  • Ingår i: Annals of Neurology. - : John Wiley & Sons Inc.. - 1531-8249 .- 0364-5134. ; 69:5, s. 778-792
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: We studied the independent and joint effects of the genes encoding alpha-synuclein (SNCA) and microtubule-associated protein tau (MAPT) in Parkinson disease (PD) as part of a large meta-analysis of individual data from case-control studies participating in the Genetic Epidemiology of Parkinson's Disease (GEO-PD) consortium. Methods: Participants of Caucasian ancestry were genotyped for a total of 4 SNCA (rs2583988, rs181489, rs356219, rs11931074) and 2 MAPT (rs1052553, rs242557) single nucleotide polymorphism (SNPs). Individual and joint effects of SNCA and MAPT SNPs were investigated using fixed- and random-effects logistic regression models. Interactions were studied on both a multiplicative and an additive scale, and using a case-control and case-only approach. Results: Fifteen GEO-PD sites contributed a total of 5,302 cases and 4,161 controls. All 4 SNCA SNPs and the MAPT H1-haplotype-defining SNP (rs1052553) displayed a highly significant marginal association with PD at the significance level adjusted for multiple comparisons. For SNCA, the strongest associations were observed for SNPs located at the 30 end of the gene. There was no evidence of statistical interaction between any of the 4 SNCA SNPs and rs1052553 or rs242557, neither on the multiplicative nor on the additive scale. Interpretation: This study confirms the association between PD and both SNCA SNPs and the H1 MAPT haplotype. It shows, based on a variety of approaches, that the joint action of variants in these 2 loci is consistent with independent effects of the genes without additional interacting effects. ANN NEUROL 2011; 69: 778-792
  • Evangelou, Evangelos, et al. (författare)
  • Non-replication of association for six polymorphisms from meta-analysis of genome-wide association studies of Parkinson's disease : large-scale collaborative study
  • 2010
  • Ingår i: American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics. - : International Society of Psychiatric Genetics. - 1552-4841 .- 1552-485X. ; 153B:1, s. 8-220
  • Tidskriftsartikel (refereegranskat)abstract
    • Early genome-wide association (GWA) studies on Parkinson's disease (PD) have not been able to yield conclusive, replicable signals of association, perhaps due to limited sample size. We aimed to investigate whether association signals derived from the meta-analysis of the first two GWA investigations might be replicable in different populations. We examined six single-nucleotide polymorphisms (SNPs) (rs1000291, rs1865997, rs2241743, rs2282048, rs2313982, and rs3018626) that had reached nominal significance with at least two of three different strategies proposed in a previous analysis of the original GWA studies. Investigators from the "Genetic Epidemiology of Parkinson's Disease" (GEOPD) consortium were invited to join in this study. Ten teams contributed replication data from 3,458 PD cases and 3,719 controls. The data from the two previously published GWAs (599 PD cases, 592 controls and 443 sibling pairs) were considered as well. All data were synthesized using both fixed and random effects models. The summary allelic odds ratios were ranging from 0.97 to 1.09 by random effects, when all data were included. The summary estimates of the replication data sets (excluding the original GWA data) were very close to 1.00 (range 0.98-1.09) and none of the effects were nominally statistically significant. The replication data sets had significantly different results than the GWA data. Our data do not support evidence that any of these six SNPs reflect susceptibility markers for PD. Much stronger signals of statistical significance in GWA platforms are needed to have substantial chances of replication. Specifically in PD genetics, this would require much larger GWA studies and perhaps novel analytical techniques.
  • Feldman, Adina L., et al. (författare)
  • Accuracy and Sensitivity of Parkinsonian Disorder Diagnoses in Two Swedish National Health Registers
  • 2012
  • Ingår i: Neuroepidemiology. - : Karger. - 1423-0208 .- 0251-5350. ; 38:3, s. 186-193
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Swedish population-based national health registers are widely used data sources in epidemiological research. Register-based diagnoses of Parkinson's disease have not been validated against clinical information. Methods: Parkinson's disease (PD) and other parkinsonian disorder diagnoses were ascertained in two registers, i.e. the National Patient Register (NPR) and the Cause of Death Register (CDR). Diagnoses were validated in terms of accuracy (positive predictive value) and sensitivity against data from a population-based study of PD in 1998-2004 that screened more than 35,000 persons and identified 194 cases of parkinsonian disorders including 132 PD cases (the gold standard for the purposes of this study). Results: Accuracy for any parkinsonian disorder diagnoses was 88.0% in the NPR and 94.4% in the CDR. Accuracy of PD diagnoses was 70.8% in the NPR and 66.7% in the CDR. Misclassification between differential parkinsonian diagnoses was common. The accuracy of PD diagnoses in the NPR improved to 83.0% by restricting the definition to primary diagnoses only. The sensitivity of PD diagnoses in the NPR and CDR combined was 83.1%, with a mean time to detection of 6.9 years. Conclusions: Population-based national health registers are valid data sources in epidemiological studies of PD or parkinsonian disorder etiology but are less suitable in studies of incidence or prevalence. Copyright (C) 2012 S. Karger AG, Basel
  • Heckman, Michael G., et al. (författare)
  • Population-specific Frequencies for LRRK2 Susceptibility Variants in the Genetic Epidemiology of Parkinson's Disease (GEO-PD) Consortium
  • 2013
  • Ingår i: Movement Disorders. - : John Wiley & Sons Inc.. - 0885-3185. ; 28:12, s. 1740-1744
  • Tidskriftsartikel (refereegranskat)abstract
    • BackgroundVariants within the leucine-rich repeat kinase 2 gene are recognized as the most frequent genetic cause of Parkinson's disease. Leucine-rich repeat kinase 2 variation related to disease susceptibility displays many features that reflect the nature of complex, late-onset sporadic disorders like Parkinson's disease. MethodsThe Genetic Epidemiology of Parkinson's Disease Consortium recently performed the largest genetic association study for variants in the leucine-rich repeat kinase 2 gene across 23 different sites in 15 countries. ResultsHerein, we detail the allele frequencies for the novel risk factors (p.A419V and p.M1646T) and the protective haplotype (p.N551K-R1398H-K1423K) nominated in the original publication. Simple population allele frequencies not only can provide insight into the clinical relevance of specific variants but also can help genetically define patient groups. ConclusionsEstablishing individual patient-based genomic susceptibility profiles that incorporate both risk factors and protective factors will determine future diagnostic and treatment strategies. (c) 2013 International Parkinson and Movement Disorder Society
  • Kang, Xiaoying, et al. (författare)
  • Association between Microscopic Colitis and Parkinson's Disease in a Swedish Population
  • 2021
  • Ingår i: Movement Disorders. - : Wiley. - 0885-3185 .- 1531-8257. ; 96:15
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Gastrointestinal inflammation has been linked with Parkinson's disease (PD). Microscopic colitis (MC) is an intestinal inflammatory disease with unknown relationship with PD.Objective: This study aimed to examine the association of MC with PD risk.Methods: In this nationwide matched cohort study in Sweden, PD incidence was compared between 12,609 patients with histologically confirmed MC and a matched population cohort of 58,879 MC-free individuals and a sibling cohort comprising all unaffected siblings of the MC patients (N-MC/N-Sibling = 6281/12,351). Hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox regression models.Results: During a mean follow-up of similar to 7 years, we identified 449 incident PD diagnoses among the MC patients and the population cohort. Overall, MC was associated with an adjusted HR of 1.76 for PD, but the association attenuated substantially during follow-up. In the time-varying effects model, PD hazard was 3.45-fold (95% CI: 2.42, 4.93) higher during the first 2 years after biopsy and 1.80-fold (95% CI: 1.23, 2.64) higher during the following 3 years among MC versus MC-free individuals but was not different beyond 5 years after biopsy (HR: 1.03; 95% CI: 0.68, 1.54). This temporal pattern of MC-PD associations persisted when comparing MC patients to their siblings. In a post hoc case-control analysis, we also detected a strong association between MC and preexisting PD (odds ratio: 3.46; 95% CI: 2.91, 4.12).Conclusions: Our findings suggest that MC may not be a risk factor for PD; instead, it may co-occur with PD as a comorbidity or develop after a diagnosis of PD.
  • Kang, Xiaoying, et al. (författare)
  • Association between Microscopic Colitis and Parkinson's Disease in a Swedish Population
  • 2021
  • Ingår i: Neurology. - : Wolters Kluwer. - 0028-3878 .- 1526-632X. ; 96:15 Suppl.
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • Objective: To examine the association between microscopic colitis (MC) and Parkinson’s disease (PD) risk.Background: Gastrointestinal inflammation has been linked with PD. MC is a chronic intestinal inflammatory disease; however, its relationship with PD is unknown.Design/Methods: A population-based matched cohort study was conducted to estimate the association between MC and incident PD diagnosis using Cox regression models. An exposed cohort of 12,609 MC patients diagnosed 1990–2017 and aged ≥35 years at diagnosis was identified from the Epidemiology Strengthened by histoPathology Reports in Sweden cohort (ESPRESSO). Two unexposed cohorts were compared to: a population cohort comprising 58,879 MC-free individuals randomly selected from the population and 1:5 matched to each MC patient by age, sex, year of biopsy and county of residence at the time of biopsy; and a sibling cohort (NMC/NSibling=6,281/12,351) including all siblings of the MC patients. Follow-up was from the date of biopsy until December 31st 2016 at latest.Results: During a mean follow-up of ~7 years, we identified 449 incident PD diagnoses among the MC patients and their matched population cohort. The overall PD risk was 76% higher among MC versus MC-free individuals; but the association attenuated substantially during follow-up. In the time-varying effects model, PD risk was 3.45-fold (95% CI: 2.42, 4.93) higher during the first 2 years after biopsy and 1.80-fold (95% CI: 1.23, 2.64) higher during the following 3 years among MC versus MC-free individuals, but was not differential beyond 5 years after biopsy (hazard ratio=1.03; 95% CI: 0.68, 1.54). This temporal pattern of MC-PD associations persisted in sibling analyses. Using a matched case-control design, we also observed a higher prevalence of prior PD diagnosis among MC patients than the matched MC-free individuals (odds ratio=3.46; 95% CI: 2.91, 4.12).Conclusions: Our findings suggest that MC may not be a risk factor, but rather a comorbidity or complication of PD.
  • Kang, Xiaoying, et al. (författare)
  • Clostridium difficile infection and risk of Parkinson's disease : A Swedish population-based cohort study
  • 2020
  • Ingår i: European Journal of Neurology. - : Blackwell Publishing. - 1351-5101 .- 1468-1331. ; 27:11, s. 2134-2141
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Gastrointestinal inflammation has been implicated in Parkinson's disease (PD). This study examined whether individuals with a history of Clostridium difficile infection (CDI) are at elevated risk of PD.METHODS: We performed a population-based cohort study using Swedish national register data. Adults aged ≥ 35 years were identified from the Swedish Population and Housing Census 1990 and followed during 1997-2013. Diagnoses of CDI and PD were extracted from the National Patient Register. Associations of CDI history with PD risk were estimated using Cox proportional hazards regression. We also explored whether the association differed by the source of CDI diagnosis (inpatient vs outpatient), presence of recurrent infections, and pre-infection use of antibiotics.RESULTS: Amongst the study population (N = 4,670,423), 34,868 (0.75%) had a history of CDI. A total of 165 and 47,035 incident PD cases were identified from individuals with and without CDI history, respectively. Across the entire follow-up, a 16% elevation of PD risk was observed among CDI group (hazard ratio: 1.16, 95% confidence interval: 1.00-1.36), which was mainly driven by increased PD risk within the first 2 years since CDI diagnosis (hazard ratio: 1.38, 95% confidence interval: 1.12-1.69). In longer follow-up, CDI was not associated with subsequent PD occurrence. This temporal pattern of CDI-PD associations was generally observed across all CDI subgroups.CONCLUSIONS: CDI may be associated with an increased short-term PD risk, but this might be explained by reverse causation and/or surveillance bias. Our results do not imply that CDI history affects long-term PD risk.
  • Krüger, Rejko, et al. (författare)
  • A large-scale genetic association study to evaluate the contribution of Omi/HtrA2 (PARK13) to Parkinson's disease
  • 2011
  • Ingår i: Neurobiology of Aging. - : Elsevier. - 1558-1497 .- 0197-4580. ; 32:3, s. 9-548
  • Tidskriftsartikel (refereegranskat)abstract
    • High-profile studies have provided conflicting results regarding the involvement of the Omi/HtrA2 gene in Parkinson's disease (PD) susceptibility. Therefore, we performed a large-scale analysis of the association of common Omi/HtrA2 variants in the Genetic Epidemiology of Parkinson's disease (GEO-PD) consortium. GEO-PD sites provided clinical and genetic data including affection status, gender, ethnicity, age at study, age at examination (all subjects); age at onset and family history of PD (patients). Genotyping was performed for the five most informative SNPs spanning the Omi/HtrA2 gene in approximately 2-3 kb intervals (rs10779958, rs2231250, rs72470544, rs1183739, rs2241028). Fixed as well as random effect models were used to provide summary risk estimates of Omi/HtrA2 variants. The 20 GEO-PD sites provided data for 6378 cases and 8880 controls. No overall significant associations for the five Omi/HtrA2 SNPs and PD were observed using either fixed effect or random effect models. The summary odds ratios ranged between 0.98 and 1.08 and the estimates of between-study heterogeneity were not large (non-significant Q statistics for all 5 SNPs; I(2) estimates 0-28%). Trends for association were seen for participants of Scandinavian descent for rs2241028 (OR 1.41, p=0.04) and for rs1183739 for age at examination (cut-off 65 years; OR 1.17, p=0.02), but these would not be significant after adjusting for multiple comparisons and their Bayes factors were only modest. This largest association study performed to define the role of any gene in the pathogenesis of Parkinson's disease revealed no overall strong association of Omi/HtrA2 variants with PD in populations worldwide.
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