Cited by 3,020Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

TREM2 Variants in Alzheimer's Disease

Open access
Guerreiro, Rita, Wojtas, Aleksandra, Bras, Jose, Carrasquillo, Minerva, Rogaeva, Ekaterina, Majounie, Elisa, Cruchaga, Carlos, Sassi, Celeste +16 more·2013·New England Journal of Medicine

Abstract

BACKGROUND: Homozygous loss-of-function mutations in TREM2, encoding the triggering receptor expressed on myeloid cells 2 protein, have previously been associated with an autosomal recessive form of early-onset dementia. METHODS: We used genome, exome, and Sanger sequencing to analyze the genetic variability in TREM2 in a series of 1092 patients with Alzheimer's disease and 1107 controls (the discovery set). We then performed a meta-analysis on imputed data for the TREM2 variant rs75932628 (predicted to cause a R47H substitution) from three genomewide association studies of Alzheimer's disease and tested for the association of the variant with disease. We genotyped the R47H variant in an additional 1887 cases and 4061 controls. We then assayed the expression of TREM2 across different regions of the human brain and identified genes that are differentially expressed in a mouse model of Alzheimer's disease and in control mice. RESULTS: We found significantly more variants in exon 2 of TREM2 in patients with Alzheimer's disease than in controls in the discovery set (P=0.02). There were 22 variant alleles in 1092 patients with Alzheimer's disease and 5 variant alleles in 1107 controls (P<0.001). The most commonly associated variant, rs75932628 (encoding R47H), showed highly significant association with Alzheimer's disease (P<0.001). Meta-analysis of rs75932628 genotypes imputed from genomewide association studies confirmed this association (P=0.002), as did direct genotyping of an additional series of 1887 patients with Alzheimer's disease and 4061 controls (P<0.001). Trem2 expression differed between control mice and a mouse model of Alzheimer's disease. CONCLUSIONS: Heterozygous rare variants in TREM2 are associated with a significant increase in the risk of Alzheimer's disease. (Funded by Alzheimer's Research UK and others.).

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Crossref · 10.1056/nejmoa1211851

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  • GWAS have identified multiple loci associated with AD, including variants in PICALM, CLU, ABCA7, SORL1, CR1, TREM2, and BIN1.

    “Genome-wide association studies (GWAS) have identified multiple loci associated with AD including to name a few, variants in PICALM , CLU , ATP-binding cassette transporter A7 ( ABCA7 ), sortilin related receptor-1 ( SORL1 ), complement receptor 1 ( CR1 ), triggering receptor expressed on myeloid cells 2 ( TREM2 ), and bridging integrator 1 ( BIN1 ) genes (219, 236, 254, 300, 343, 344, 528, 543).”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [219]

    The introduction identifies CLU, PICALM, CR1, BIN1, and ABCA7 as genes implicated by genome-wide association studies. The Methods and Results describe TREM2 as identified through sequencing, with an imputed GWAS meta-analysis confirming its association—not identifying it. The cited paper does not identify SORL1 among the GWAS loci it discusses. (LLM, conf=0.88)

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  • TREM2 and two novel rare coding variants, PLCG2 and ABI3, implicate innate immunity in AD pathophysiology.

    “TREM2 (219, 300, 543) and two novel rare coding variants, PLCG2 and ABI3 , implicate innate immunity in AD pathophysiology (543), but whether these variants can influence vascular-inflammatory cross-talk contributing to AD pathophysiology remains unclear.”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [219]

    The Discussion links rare TREM2 variants to Alzheimer’s disease risk and describes TREM2’s role in microglial immune and inflammatory responses. Our copy does not identify PLCG2 or ABI3 as Alzheimer’s-associated rare coding variants; searches for both genes found no relevant passage. The citation therefore supports the TREM2 portion, but not the claim about the other two genes. (LLM, conf=0.91)

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  • GWAS identified many AD risk genes related to the immune response and microglia, including phagocytosis genes such as CD33 and TREM2.

    “Genome-wide association studies (GWAS) identified many AD risk genes related to the immune response and microglia, including those implicated in phagocytosis, such as CD33 and TREM24,5,6,7,8.”

    From Amyloid-β induces lipid droplet-mediated microglial dysfunction via the enzyme DGAT2 in Alzheimer’s disease (2025) · cites this paper as [7]

    The introductory passage lists CD33 among Alzheimer’s risk loci identified by GWAS, and the Discussion links TREM2 in microglia to phagocytosis. But the Methods (Study Design) say this paper identified the TREM2 variants through exome or full-genome sequencing; GWAS data were used afterward to confirm an association, not to identify TREM2 as the claim states. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • PLCG2 is a downstream component of TREM2 signaling, an important microglial AD risk gene.

    “PLCG2 has also been shown to be a downstream component of TREM2 signaling, an important microglial AD risk gene. 7 , 8”

    From The P522R protective variant of PLCG2 promotes the expression of antigen presentation genes by human microglia in an Alzheimer's disease mouse model (2022) · cites this paper as [7]

    The Discussion identifies TREM2 as a signaling receptor and reports that rare TREM2 variants increase Alzheimer’s disease risk; the Results locate TREM2 in microglia around amyloid plaques. But the paper does not identify PLCG2 as a downstream component of TREM2 signaling; its Discussion names TYROBP as a component of the receptor-signaling complex. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Rare coding variants in microglial genes such as TREM2 and PLCG2 are linked to Alzheimer's disease pathology.

    “Human genetic studies have linked rare coding variants in microglial genes, such as TREM2, and more recently PLCG2 to Alzheimer’s disease (AD) pathology.”

    From PLCγ2 regulates TREM2 signalling and integrin-mediated adhesion and migration of human iPSC-derived macrophages (2021) · cites this paper as [2]

    The Abstract Results and Conclusions report an association between rare TREM2 variants and Alzheimer’s disease, and the Discussion places TREM2 in microglial responses. The paper does not report a PLCG2 variant association, so it supports only the TREM2 part of the claim. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Authors
Guerreiro, R., Wojtas, A., Bras, J., Carrasquillo, M., Rogaeva, E., Majounie, E., Cruchaga, C., Sassi, C., Kauwe, J. S. K., Younkin, S., Hazrati, L., Collinge, J., Pocock, J., Lashley, T., Williams, J., Lambert, J.-C., Amouyel, P., Goate, A., Rademakers, R., Morgan, K., Powell, J., St. George-Hyslop, P., Singleton, A., & Hardy, J.
Affiliations
UCL Queen Square Institute of Neurology (GB)
Venue
New England Journal of Medicine
Published
2013-01-10
Volume
368
Issue
2
Pages
117-127
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2124490243
Cited by
3,020
References
33
Citations by year
2026: 165 · 2025: 204 · 2024: 238 · 2023: 245 · 2022: 265 · 2021: 250 · 2020: 269 · 2019: 234 · 2018: 251 · 2017: 203 · 2016: 194 · 2015: 196 · 2014: 160 · 2013: 137 · 2012: 6
FWCI
106.95
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Commons@Becker (Washington University School of Medicine) (submittedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion)
  • Universitätsbibliographie, Universität Duisburg-Essen (submittedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • eScholarship@McGill (McGill) (submittedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
  • Research Portal (King's College London) (submittedVersion)
  • Bristol Research (University of Bristol) (submittedVersion)
Funders
  • U.S. Department of Health and Human Services
  • University of Dundee
  • Wellcome Trust (WT089698, 089703, 081864, 089698, 095317)
  • Alzheimer Society
  • National Institute for Health and Care Research (NF-SI-0512-10033)
  • University College London
  • Fondation pour la Recherche sur Alzheimer
  • National Institutes of Health (5p30ns069329-02)
  • Canadian Institutes of Health Research
  • Medical Research Council (MC_G1000735, MR/K013041/1)
  • National Institute on Aging (R01AG042611, R01AG018023, U01AG006786, R01-AG18023, R01AG041797, P50AG008702, Z01AG000950, P50AG005681, U24AG056270, U24AG021886, P50AG016574)
  • National Institute of Neurological Disorders and Stroke (P30-NS069329, 5P30 NS069329-02)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
TREM2, Alzheimer's disease, loss-of-function mutations, rare variants, genetic risk, mouse models of Alzheimer's disease, early-onset dementia, myeloid cells
MeSH terms
Aged, Alzheimer Disease, Animals, Brain, Genotype, Heterozygote, Humans, Membrane Glycoproteins, Mice, Inbred A, Mutation, Receptors, Immunologic, Risk Factors, RNA, Messenger, Genetic Variation, Sequence Analysis, DNA, Mice, Genome-Wide Association Study, Exome, Genotyping Techniques

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