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Luckett ES, Abakkouy Y, Reinartz M, Adamczuk K, Schaeverbeke J, Verstockt S, De Meyer S, Van Laere K, Dupont P, Cleynen I, Vandenberghe R. Association of Alzheimer’s disease polygenic risk scores with amyloid accumulation in cognitively intact older adults. Alzheimers Res Ther 2022; 14:138. [PMID: 36151568 PMCID: PMC9508733 DOI: 10.1186/s13195-022-01079-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 09/08/2022] [Indexed: 11/10/2022]
Abstract
Abstract
Background
Early detection of individuals at risk for Alzheimer’s disease (AD) is highly important. Amyloid accumulation is an early pathological AD event, but the genetic association with known AD risk variants beyond the APOE4 effect is largely unknown. We investigated the association between different AD polygenic risk scores (PRS) and amyloid accumulation in the Flemish Prevent AD Cohort KU Leuven (F-PACK).
Methods
We calculated PRS with and without the APOE region in 90 cognitively healthy F-PACK participants (baseline age 67.8 (52–80) years, 41 APOE4 carriers), with baseline and follow-up amyloid-PET (time interval 6.1 (3.4–10.9) years). Individuals were genotyped using Illumina GSA and imputed. PRS were calculated using three p-value thresholds (pT) for variant inclusion: 5 × 10−8, 1 × 10−5, and 0.1, based on the stage 1 summary statistics from Kunkle et al. (Nat Genet 51:414–30, 2019). Linear regression models determined if these PRS predicted amyloid accumulation.
Results
A score based on PRS excluding the APOE region at pT = 5 × 10−8 plus the weighted sum of the two major APOE variants (rs429358 and rs7412) was significantly associated with amyloid accumulation (p = 0.0126). The two major APOE variants were also significantly associated with amyloid accumulation (p = 0.0496). The other PRS were not significant.
Conclusions
Specific PRS are associated with amyloid accumulation in the asymptomatic phase of AD.
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Antiga LG, Sibbens L, Abakkouy Y, Decorte R, Van Den Bogaert W, Van de Voorde W, Bekaert B. Cell survival and DNA damage repair are promoted in the human blood thanatotranscriptome shortly after death. Sci Rep 2021; 11:16585. [PMID: 34400689 PMCID: PMC8368024 DOI: 10.1038/s41598-021-96095-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 07/30/2021] [Indexed: 11/09/2022] Open
Abstract
RNA analysis of post-mortem tissues, or thanatotranscriptomics, has become a topic of interest in forensic science due to the essential information it can provide in forensic investigations. Several studies have previously investigated the effect of death on gene transcription, but it has never been conducted with samples of the same individual. For the first time, a longitudinal mRNA expression analysis study was performed with post-mortem human blood samples from individuals with a known time of death. The results reveal that, after death, two clearly differentiated groups of up- and down-regulated genes can be detected. Pathway analysis suggests active processes that promote cell survival and DNA damage repair, rather than passive degradation, are the source of early post-mortem changes of gene expression in blood. In addition, a generalized linear model with an elastic net restriction predicted post-mortem interval with a root mean square error of 4.75 h. In conclusion, we demonstrate that post-mortem gene expression data can be used as biomarkers to estimate the post-mortem interval though further validation using independent sample sets is required before use in forensic casework.
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Affiliation(s)
- Laura G Antiga
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
- Department of Experimental and Health Sciences (CEXS), University Pompeu Fabra (UPF), Barcelona, Spain
| | - Lode Sibbens
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
| | - Yasmina Abakkouy
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
| | - Ronny Decorte
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
- Laboratory of Forensic Genetics, UZ Leuven, 3000, Leuven, Belgium
| | - Wouter Van Den Bogaert
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
- Laboratory of Forensic Genetics, UZ Leuven, 3000, Leuven, Belgium
| | - Wim Van de Voorde
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium
- Laboratory of Forensic Genetics, UZ Leuven, 3000, Leuven, Belgium
| | - Bram Bekaert
- Forensic Biomedical Sciences, Department of Imaging and Pathology, KU Leuven, Herestraat 49, Box 7003 71, 3000, Leuven, Belgium.
- Laboratory of Forensic Genetics, UZ Leuven, 3000, Leuven, Belgium.
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Abakkouy Y, Cleynen I. The Promise of Polygenic Risk Scores as a Research Tool to Analyse the Genetics Underlying IBD Phenotypes. J Crohns Colitis 2021; 15:877-878. [PMID: 33755717 DOI: 10.1093/ecco-jcc/jjab021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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