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The role of TREM2 in Alzheimer's disease and other neurodegenerative disorders
Open accessAbstract
Alzheimer's disease is a genetically complex disorder; rare variants in the triggering receptor expressed on myeloid cells 2 (TREM2) gene have been shown to as much as triple an individual's risk of developing Alzheimer's disease. TREM2 is a transmembrane receptor expressed in cells of the myeloid lineage, and its association with Alzheimer's disease supports the involvement of immune and inflammatory pathways in the cause of the disease, rather than as a consequence of the disease. TREM2 variants associated with Alzheimer's disease induce partial loss of function of the TREM2 protein and alter the behaviour of microglial cells, including their response to amyloid plaques. TREM2 variants have also been shown to cause polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy and frontotemporal dementia. Although the low frequency of TREM2 variants makes it difficult to establish robust genotype-phenotype correlations, such studies are essential to enable a comprehensive understanding of the role of TREM2 in different neurological diseases, with the ultimate goal of developing novel therapeutic approaches.
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“Whole-genome analysis led to the identification of relatively rare mutations in TREM2 gene that are associated with a high AD risk.187”
From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [187]
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“Besides, the prevalence of TREM2 mutations is low in the general or even AD population.(59) Finally, our findings were based on cross-sectional studies which contributed to the deficiency of necessary causality.”
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“To date, more than 60 coding TREM2 variants have been identified, showing various degrees of population frequency.([14]) TREM2 variants have altered binding to their ligands, including R47H, R62H+, and T96K.”
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“44 Notably, many of the loci with known rare variants are also associated with common polymorphisms in GWAS studies, including TREM2 , SORL1 , ADAM10 , and ABCA7 , 45 highlighting how both avenues of exploration ultimately serve a shared purpose.”
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“For example, TREM2 gene variant rs75932628(T) increased by two to three times the risk for AD in European and North American populations [71].”
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“Among the most established is triggering receptor expressed on myeloid cells 2 (TREM2), which regulates microglial activation, survival, and phagocytosis [70].”
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“To date, over 60 coding TREM2 variants have been identified, displaying various degrees of population frequency (117).”
BackgroundBiofluid biomarkers for Alzheimer’s disease
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Elucidating the Role of Trem2 in Lipid Metabolism and Neuroinflammation
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“…have demonstrated that TREM2 exerts critical effects on the pathogenesis of neurological disorders: pathogenic mutations in TREM2 impair its normal function, while reactive upregulation of TREM2 modulates its protective capacities—both scenarios ultimately shaping disease progression [8, 9].”
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“10 Variants of TREM2 have been largely reported to be associated with a variety of neurodegenerative disorders, including PD. 11,12 A recent study has verified that inhibition of TREM2 contributes to the occurrence and development of PD. 13 Meanwhile, published data have suggested the important…”
BackgroundSilvaieh, S., König, T., Wurm, R., Parvizi, T., Berger–Sieczkowski, E., Goeschl, S., Hotzy, C., Wagner, M., Berutti, R., Sammler, E. M., et al. (2023) · Human Genomics · doi:10.1186/s40246-023-00499-z · Cited by 8
“Two patients (EOD-2 and EOD-36) carried the well-established TREM2 risk variants p.(R47H) and p.(R62C), respectively, [12, 13].”
BackgroundSchoenberg, P. L. A., Song, A. K., Mohr, E., Rogers, B. P., Peterson, T. E., & Murphy, B. A. (2023) · Human Brain Mapping · doi:10.1002/hbm.26491 · Cited by 8
“The TREM2 receptor has been connected to various pathophysiology in brain diseases such as dementia (Carmona et al., 2018; Edwin & Henjum, 2020; Gratuze et al., 2018; Ulland & Colonna, 2018; Wang et al., 2020; Zhao et al., 2022), and TREM2 signaling is involved in the regulation of critical…”
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Atypical findings: Atypical parkinsonian syndromes or Atypical parkinsonian syndromes look-alikes
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“For example, TREM2 was proved involved in the immune and inflammatory pathways in the cause of AD [34], and microglia CST7-mediated impairment in the lysosomal pathway was essential in AD [35].”
The Unveiling of Therapeutic Targets for Alzheimer’s Disease: An Integrative Review
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“Heterozygous variants including R47H and R62H are risk factors for Alzheimer ’ s disease, whereas homozygous loss of function was found in families with the rare recessive NHD [33 – 35].”
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MXenes for neurodegenerative disorders
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Advances in neuroRehabilitation of TREM2-related dementia
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“50 Recently,itwasdemonstratedthatelevated soluble TREM2 in CSF is associated with reduced cognitive decline in AD, 51 highlighting that TREM2 activation may represent a viable NANT treatment strategy to impact multiple underlying microglia-driven pathologies.”
Resilience mechanisms underlying Alzheimer’s disease
Chew, C. S., Jy, L., Ng, K. Y., Koh, R. Y., & Chye, S. M. (2025) · Metabolic Brain Disease · doi:10.1007/s11011-024-01507-4 · Cited by 6
“In sporadic AD, TREM2 with an arginine-to-histidine mutation at position 47 (R47H) or position 62 (R62H) may lead to the deposition of Aβ plaque and induce neuronal injury (Carmona et al. 2018; Hou et al. 2022; Qin et al. 2021; Ulland et al. 2017).”
Molecular and Therapeutic Targets for Amyloid-beta Plaques in Alzheimer's Disease: A Review Study
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“Microglia have been shown to surround and limit Aβ plaques in the AD brain in the absence of microglial scavenging receptors and resulted in decreased clearance of Aβ by microglia (Carmona et al., 2018; Jay et al., 2017; Zheng et al., 2018).”
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“TREM2 is located on human chromosome 6p21, a hot zone linked with AD susceptibility [12,13].”
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“, Triggering receptor expressed on myeloid cells 2) induces microglial anti-inflammatory activation in ADrelated conditions, and it is regarded as a potential target for the prevention and treatment of Alzheimer’s disease (Carmona et al., 2018), (Ulrich et al.”
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Familial cerebral amyloid disorders with prominent white matter involvement
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Self-citationThe Radiogenomics of Late-onset Alzheimer Disease
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Exploiting acylaminopyrazole scaffold for polypharmacology approach in Alzheimer's disease
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Biophysical characterization of TREM2 missense variants implicated in neurodegenerative disease
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“Similarly to AD, the Y38C, W50C, T66M, and V126G variants have been found and validated in numerous studies as causal factors for NHD [13 – 17].”
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“The Trem2 gene, which is related to microglia activation under amyloid beta toxicity in AD brain [50] was increased in the MCAO and AD mouse brain cortex in this study.”
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“39,40 While many studies demonstrate an elevation of CSF sTREM2 along the AD continuum, inconsistencies exist regarding disease stages, 41 thereby reducing the discriminative power necessary for diagnostic purposes.”
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“24,25 Misfolded and aggregated proteins bind to pattern recognition receptors on microglia and astro-glia, triggering an innate immune response characterized by the release of in fl ammatory mediators that contribute to disease progression and severity.”
Metadata
- Authors
- Carmona, S., Zahs, K., Wu, E., Dakin, K., Bras, J., & Guerreiro, R.
- Affiliations
- UK Dementia Research Institute (GB)
- Alzforum (US)
- Corresponding author
- Guerreiro, Rita
- Venue
- The Lancet Neurology
- Publisher
- Elsevier BV
- Published
- 2018-08
- Volume
- 17
- Issue
- 8
- Pages
- 721-730
- ISSN
- 1474-4422 (ISSN-L)
- OpenAlex
- W2884070953
- Cited by
- 244
- References
- 107
- Citations by year
- 2026: 13 · 2025: 28 · 2024: 42 · 2023: 38 · 2022: 30 · 2021: 32 · 2020: 28 · 2019: 28 · 2018: 4
- FWCI
- 2.18
- Type
- journal article
- Language
- en
- Open access
- green
- discovery.ucl.ac.uk
- Licence
- Locations
- The Lancet Neurology (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion, other-oa)
- Funders
- Alzheimer's Society
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- TREM2, Alzheimer's disease, neurodegenerative diseases, myeloid cells, microglia, amyloid plaques, neuroinflammation, genetic risk variants, loss-of-function mutations, frontotemporal dementia, genotype-phenotype correlation, therapeutic target
- MeSH terms
- Alzheimer Disease, Humans, Membrane Glycoproteins, Receptors, Immunologic, Neurodegenerative Diseases, Genetic Predisposition to Disease
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