Cited by 2,558Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchGenetic Associations and Epidemiology

Variant of TREM2 Associated with the Risk of Alzheimer's Disease

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Jonsson, Thorlakur, Stefansson, Hreinn, Steinberg, Stacy, Jonsdottir, Ingileif, Jonsson, Palmi V., Snaedal, Jon, Bjornsson, Sigurbjorn, Huttenlocher, Johanna +16 more·2013·New England Journal of Medicine

Abstract

BACKGROUND: Sequence variants, including the ε4 allele of apolipoprotein E, have been associated with the risk of the common late-onset form of Alzheimer's disease. Few rare variants affecting the risk of late-onset Alzheimer's disease have been found. METHODS: We obtained the genome sequences of 2261 Icelanders and identified sequence variants that were likely to affect protein function. We imputed these variants into the genomes of patients with Alzheimer's disease and control participants and then tested for an association with Alzheimer's disease. We performed replication tests using case-control series from the United States, Norway, The Netherlands, and Germany. We also tested for a genetic association with cognitive function in a population of unaffected elderly persons. RESULTS: A rare missense mutation (rs75932628-T) in the gene encoding the triggering receptor expressed on myeloid cells 2 (TREM2), which was predicted to result in an R47H substitution, was found to confer a significant risk of Alzheimer's disease in Iceland (odds ratio, 2.92; 95% confidence interval [CI], 2.09 to 4.09; P=3.42×10(-10)). The mutation had a frequency of 0.46% in controls 85 years of age or older. We observed the association in additional sample sets (odds ratio, 2.90; 95% CI, 2.16 to 3.91; P=2.1×10(-12) in combined discovery and replication samples). We also found that carriers of rs75932628-T between the ages of 80 and 100 years without Alzheimer's disease had poorer cognitive function than noncarriers (P=0.003). CONCLUSIONS: Our findings strongly implicate variant TREM2 in the pathogenesis of Alzheimer's disease. Given the reported antiinflammatory role of TREM2 in the brain, the R47H substitution may lead to an increased predisposition to Alzheimer's disease through impaired containment of inflammatory processes. (Funded by the National Institute on Aging and others.).

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Crossref · 10.1056/nejmoa1211103

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  • GWAS and sequencing studies have found associations between AD and genes expressed in myeloid cells, including TREM2, ABCA7, and CD33.

    “At the genetic level, GWAS and sequencing studies have found associations between AD and genes expressed in myeloid cells, including TREM2, ABCA7, and CD331,2,5,15–17.”

    From A common haplotype lowers PU.1 expression in myeloid cells and delays onset of Alzheimer's disease (2017) · cites this paper as [15]

    The Results report an association between a TREM2 variant and Alzheimer’s disease, and the Discussion identifies TREM2 in microglia and CD33 as a myeloid cell-surface receptor linked to Alzheimer’s disease by genomewide association studies. ABCA7 appears in a cited study’s title in the References, but the paper does not discuss its myeloid-cell expression; that part of the claim is not supported by this copy. (LLM, conf=0.84)

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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 [300]

    The Discussion links the TREM2 risk variant to microglial immune activity, supporting the TREM2 portion of the claim. The paper does not address PLCG2 or ABI3, so it cannot support the claim about those two variants. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • 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 [8]

    The Discussion reports Alzheimer’s risk variants in several inflammation-related genes, including CD33, and links TREM2 in microglia to phagocytosis. The Results report a genomewide association for a TREM2 variant. Our copy describes CD33 as a myeloid cell-surface receptor but does not establish its role in phagocytosis, so that part of the claim is unsupported. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Prior studies proposed that plaque-associated microglia compact amyloid plaques through receptors implicated in phagocytosis such as TREM2, AXL, and MER.

    “Prior studies proposed that these cells compact amyloid plaques through receptors implicated in phagocytosis such as TREM214, (expressed on myeloid cells and associated to increased AD risk)14,8, AXL, and MER79.”

    From Amyloid-β induces lipid droplet-mediated microglial dysfunction via the enzyme DGAT2 in Alzheimer’s disease (2025) · cites this paper as [8]

    The Discussion (page unavailable in our copy) says TREM2 is expressed on microglia and links its expression to amyloid phagocytosis near plaques. It does not say that TREM2 enables microglia to compact plaques. The AXL and MER portion carries a different citation and is not attributed to this source. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Coding alterations in TREM2 dramatically increase the risk of developing late-onset Alzheimer's disease (LOAD).

    “Coding alterations in TREM2, a transmembrane glycoprotein expressed on myeloid lineage cells that modulates innate immune function [1], dramatically increase the risk of developing late-onset Alzheimer’s disease (LOAD) [2,3].”

    From TREM2-Deficient Microglia Attenuate Tau Spreading In Vivo (2023) · cites this paper as [3]

    The Abstract Results report that one coding alteration, rs75932628-T (R47H), is associated with approximately threefold higher odds of Alzheimer’s disease. The Results section says no other TREM2 variant likely to affect protein function showed a nominally significant association, so this paper does not support the broader claim that coding alterations generally increase LOAD risk. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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Authors
Jonsson, T., Stefansson, H., Steinberg, S., Jonsdottir, I., Jonsson, P. V., Snaedal, J., Bjornsson, S., Huttenlocher, J., Levey, A. I., Lah, J. J., Rujescu, D., Hampel, H., Giegling, I., Andreassen, O. A., Engedal, K., Ulstein, I., Djurovic, S., Ibrahim-Verbaas, C., Hofman, A., Ikram, M. A., van Duijn, C. M., Thorsteinsdottir, U., Kong, A., & Stefansson, K.
Affiliations
  • deCODE Genetics (Iceland) (IS)
  • University of Tübingen (DE)
  • Emory University (US)
  • Martin Luther University Halle-Wittenberg (DE)
  • Goethe University Frankfurt (DE)
  • Oslo University Hospital (NO)
  • Norwegian National Centre for Ageing and Health (NO)
  • Erasmus MC (NL)
Venue
New England Journal of Medicine
Published
2013-01-10
Volume
368
Issue
2
Pages
107-116
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2128613449
Cited by
2,558
References
51
Citations by year
2026: 133 · 2025: 160 · 2024: 201 · 2023: 202 · 2022: 211 · 2021: 233 · 2020: 232 · 2019: 192 · 2018: 220 · 2017: 168 · 2016: 151 · 2015: 167 · 2014: 150 · 2013: 129 · 2012: 6
FWCI
96.88
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
  • RePub (Erasmus University Rotterdam) (submittedVersion, other-oa)
  • Hirsla (Landspítali University Hospital) (submittedVersion, other-oa)
Funders
  • National Institute on Aging (U01AG006781, P50AG025688, U24AG021886)
  • National Human Genome Research Institute (U01HG004438, U01HG004610, U01HG006375, U01HG004603)
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 › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
TREM2, Alzheimer's disease, late-onset Alzheimer's disease, genetic risk, rare variants, cognitive function, neuroinflammation, Icelandic population, replication
MeSH terms
Aged, 80 and over, Alzheimer Disease, Cognition, Heterozygote, Humans, Iceland, Membrane Glycoproteins, Receptors, Immunologic, Risk Factors, Genetic Variation, Case-Control Studies, Sequence Analysis, DNA, Mutation, Missense, Polymorphism, Single Nucleotide, Apolipoprotein E4, Genotyping Techniques

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