Cited by 291Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Novel Alzheimer risk genes determine the microglia response to amyloid-β but not to TAU pathology

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Sierksma, Annerieke, Lu, Ashley, Mancuso, Renzo, Fattorelli, Nicola, Thrupp, Nicola, Salta, Evgenia, Zoco, Jesus, Blum, David +3 more·2020·EMBO Molecular Medicine

Published version of a preprint

Abstract

Polygenic risk scores have identified that genetic variants without genome‐wide significance still add to the genetic risk of developing Alzheimer's disease (AD). Whether and how subthreshold risk loci translate into relevant disease pathways is unknown. We investigate here the involvement of AD risk variants in the transcriptional responses of two mouse models: APPswe/PS1 L166P and Thy‐TAU22. A unique gene expression module, highly enriched for AD risk genes, is specifically responsive to Aβ but not TAU pathology. We identify in this module 7 established AD risk genes ( APOE , CLU , INPP5D , CD33, PLCG2 , SPI1, and FCER1G ) and 11 AD GWAS genes below the genome‐wide significance threshold ( GPC2, TREML2, SYK, GRN, SLC2A5, SAMSN1, PYDC1, HEXB, RRBP1, LYN, and BLNK), that become significantly upregulated when exposed to Aβ. Single microglia sequencing confirms that Aβ, not TAU, pathology induces marked transcriptional changes in microglia, including increased proportions of activated microglia. We conclude that genetic risk of AD functionally translates into different microglia pathway responses to Aβ pathology, placing AD genetic risk downstream of the amyloid pathway but upstream of TAU pathology.

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Crossref · 10.15252/emmm.201910606

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  • Sierskma et al. identified 18 genes that both overlapped with AD GWAS datasets and were maintained between young and old APP transgenic mice.

    “Sierskma et al. identified 18 genes that both overlapped with AD GWAS datasets and were maintained between young and old APP transgenic mice, which were predominantly expressed by microglia and appear to be regulated by Spi150.”

    From Modest changes in Spi1 dosage reveal the potential for altered microglial function as seen in Alzheimer’s disease (2021) · cites this paper as [50]

    The Results section on prioritization identifies 18 genes at the intersection of AD GWAS genes, the APPtg-Blue module, and genes differentially expressed in the APPtg age-by-genotype comparison. Figure 4 and the accompanying Results support their microglial expression and possible regulation by Spi1. The paper does not say their expression was maintained between young and old APP transgenic mice; differential expression with age was a selection criterion. Page numbers are not available in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Those 18 genes were predominantly expressed by microglia and appear to be regulated by Spi1.

    “Sierskma et al. identified 18 genes that both overlapped with AD GWAS datasets and were maintained between young and old APP transgenic mice, which were predominantly expressed by microglia and appear to be regulated by Spi150.”
  • Recent scRNA-seq studies identified marked transcriptional changes in microglia in response to Aβ.

    “Furthermore, recent scRNA-seq studies identified marked transcriptional changes in microglia in response to Aβ (52).”
  • Several studies have shown that transcriptional signatures can be used to investigate Aβ accumulation, region-specific expression of tau, and activated immune response.

    “Several studies have shown that this hypothesis-generating, unbiased readout can be used to investigate Aβ accumulation (Sierksma et al., 2020), region-specific expression of tau (Castanho et al., 2020), and activated immune response (Kang et al., 2018).”
  • Single microglia sequencing of two different mouse models of AD, one displaying either Aβ or tau pathology, confirmed expression of AD risk genes, including PLCG2, and confirmed that more microglia adopt an activated phenotype when facing Aβ than tau pathology.

    “Single microglia sequencing of two different mouse models of AD, one displaying either Aβ or tau pathology, further confirmed the expression of AD risk genes, including PLCG2 gene, and also confirmed that more microglia adopt an activated phenotype when facing Aβ than tau pathology (166).”

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Authors
Sierksma, A., Lu, A., Mancuso, R., Fattorelli, N., Thrupp, N., Salta, E., Zoco, J., Blum, D., Buée, L., De Strooper, B., & Fiers, M.
Affiliations
  • VIB-KU Leuven Center for Brain & Disease Research (BE)
  • Inserm (FR)
Corresponding author
Fiers, Mark
Venue
EMBO Molecular Medicine
Published
2020-01-17
Volume
12
Issue
3
Pages
e10606-e10606
ISSN
  • 1757-4676 (ISSN-L)
  • 1757-4684
OpenAlex
W3000035810
Cited by
291
References
74
Citations by year
2026: 21 · 2025: 43 · 2024: 37 · 2023: 48 · 2022: 58 · 2021: 54 · 2020: 28 · 2019: 1 · 2018: 1
FWCI
28.26
Type
journal article
Language
en
Open access
Locations
  • EMBO Molecular Medicine (publishedVersion, other-oa)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Lirias (KU Leuven) (acceptedVersion)
  • Lirias (submittedVersion, other-oa)
  • Lirias (KU Leuven) (submittedVersion, other-oa)
  • HAL (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Leuven Universitair Fonds
  • Alzheimer Research Foundation (P16017)
  • Fonds voor Wetenschappelijk Onderzoek (1139520N, 12A5316N, G0C9219N)
  • Alzheimer's Association (AARF‐16‐442853)
  • KU Leuven
  • Vlaams Instituut voor Biotechnologie
  • Vlaamse Overheid
  • Vlaams Initiatief voor Netwerken voor Dementie Onderzoek
  • Geneeskundige Stichting Koningin Elisabeth
  • Bax‐Vanluffelen Chair for Alzheimer's Disease
  • Agence National Recherche (ANR‐16‐COEN‐0007)
  • UK Research and Innovation|MRC|Medical Research Foundation
  • Alzheimer Society
  • Alzheimer Research UK
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, Alzheimer's disease risk genes, microglia, amyloid-beta, tau pathology, polygenic risk score, single-cell RNA sequencing, microglial activation, apolipoprotein E, clusterin, CD33, PLCγ2, PU.1, FCER1G, Syk, GPC2
MeSH terms
Alzheimer Disease, Animals, Disease Models, Animal, Hippocampus, Male, Mice, Transgenic, Amyloid beta-Peptides, tau Proteins, Microglia, Mice, Gene Regulatory Networks

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