Cited by 562Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Late onset Alzheimer’s disease genetics implicates microglial pathways in disease risk

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Efthymiou, Anastasia G., Goate, Alison M.·2017·Molecular Neurodegeneration

Abstract

Alzheimer's disease (AD) is a highly heritable complex disease with no current effective prevention or treatment. The majority of drugs developed for AD focus on the amyloid cascade hypothesis, which implicates Aß plaques as a causal factor in the disease. However, it is possible that other underexplored disease-associated pathways may be more fruitful targets for drug development. Findings from gene network analyses implicate immune networks as being enriched in AD; many of the genes in these networks fall within genomic regions that contain common and rare variants that are associated with increased risk of developing AD. Of these genes, several (including CR1, SPI1, the MS4As, TREM2, ABCA7, CD33, and INPP5D) are expressed by microglia, the resident immune cells of the brain. We summarize the gene network and genetics findings that implicate that these microglial genes are involved in AD, as well as several studies that have looked at the expression and function of these genes in microglia and in the context of AD. We propose that these genes are contributing to AD in a non-Aß-dependent fashion.

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Crossref · 10.1186/s13024-017-0184-x

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  • Many immune molecules either express specifically in microglia or are enriched in microglial cells, suggesting that microglia plays a crucial role in the immune regulation of AD.

    “Interestingly, many of these immune molecules either express specifically in microglia (e.g., the MS4As, CD33, SPI1, and INPP5D) or are enriched in microglial cells (e.g., CR1, ABCA7, and CLU), suggesting that microglia plays crucial role in the immune regulation of AD.247”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [247]

    The Background and Conclusion implicate microglial immune pathways in Alzheimer’s disease, and the AD GWAS sections describe several named genes as expressed in microglia. But the paper also says MS4As, SPI1, CD33 and INPP5D are expressed in other immune cells, so it does not support calling them microglia-specific; the searched passages do not establish the claimed microglial enrichment of CR1, ABCA7 or CLU. The Conclusion also leaves open whether peripheral immune cells contribute to the immune effect. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Large-scale GWAS identified many additional genetic risk factors linked with immune response (odds ratio 0.9-1.15).

    “Except APOE and TREM2, large-scale genome-wide association study (GWAS) has identified many additional genetic risk factors linked with immune response (odds ratio 0.9–1.15).”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [247]

    The AD GWAS studies sections report 25 AD-risk loci from GWAS meta-analyses and discuss several loci associated with microglial or immune-related genes, including CR1 and the MS4A cluster. The passages do not give the claimed odds-ratio range of 0.9–1.15; they also caution that GWAS identifies loci, not necessarily the specific causal genes. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Human genome-wide association studies have implicated mutations in microglial receptors in the development of several neurodegenerative diseases.

    “Indeed, human genome-wide association studies (GWAS) have implicated mutations in microglial receptors in the development of several neurodegenerative diseases (Cooper-Knock et al., 2017; Efthymiou and Goate, 2017; IMSG, 2019).”

    From SYK coordinates neuroprotective microglial responses in neurodegenerative disease (2022) · cites this paper as Efthymiou and Goate, 2017

    In ‘AD GWAS studies > Additional plausible microglial genes’ (page unavailable), the paper reports GWAS-associated variants at CD33, a microglial receptor, in Alzheimer’s disease. Its TREM2 discussion mentions possible links to other neurodegenerative diseases but says those links are far less compelling than the Alzheimer’s evidence; it does not establish that GWAS implicated receptor mutations across several such diseases. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Some Alzheimer's disease risk loci are highly enriched within or near genes encoding microglia-specific transcription factors.

    “Interestingly, some Alzheimer's disease risk loci are highly enriched within or near genes encoding microglia‐specific transcription factors, highlighting their crucial roles in the pathogenesis of Alzheimer's disease (Table 1) [5, 7, 20, 21].”

    From Targeting Microglial Transcriptional Reprogramming as a Therapy Strategy for Alzheimer's Disease (2026) · cites this paper as [20]

    The AD GWAS studies section identifies SPI1, which encodes the transcription factor PU.1, as the likely gene affected at one AD-risk locus. The epigenetic-signals section also reports enrichment of AD-associated loci in enhancer regions and enrichment of a PU.1 binding motif. Neither passage establishes that multiple AD-risk loci are highly enriched within or near genes encoding microglia-specific transcription factors; the paper describes PU.1 as associated with microglial activation, not as microglia-specific. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Recent AD genetic studies have demonstrated that immune and microglia networks are critical players in AD.

    “In support of this, recent AD genetic studies have demonstrated that immune and microglia networks are critical players in AD (3, 4).”

    From Deletion of <i>Abi3</i> gene locus exacerbates neuropathological features of Alzheimer’s disease in a mouse model of Aβ amyloidosis (2021) · cites this paper as [4]

    The Background says GWAS findings and gene-expression network analyses implicate immune and microglial networks as important players in AD. It also says their exact contribution is not well understood, so “demonstrated” and “critical” express more certainty than the source does. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

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Authors
Efthymiou, A. G., & Goate, A. M.
Affiliations
Icahn School of Medicine at Mount Sinai (US)
Corresponding author
Goate, Alison M.
Venue
Molecular Neurodegeneration
Published
2017-05-26
Volume
12
Issue
1
Pages
43-43
ISSN
1750-1326 (ISSN-L)
OpenAlex
W2617693460
Cited by
562
References
102
Citations by year
2026: 40 · 2025: 59 · 2024: 78 · 2023: 68 · 2022: 84 · 2021: 80 · 2020: 56 · 2019: 41 · 2018: 45 · 2017: 10 · 2012: 1
FWCI
5.10
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Institutes of Health (U01AG049508, U01AG052411)
  • JPB Foundation
  • Foundation for the National Institutes of Health (RF1AG054011)
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
late-onset Alzheimer's disease, microglia, genetic risk, gene networks, immune pathways, TREM2, CD33, ABCA7, complement receptor 1, PU.1, INPP5D, amyloid plaques, therapeutic target
MeSH terms
Alzheimer Disease, Animals, Humans, Risk Factors, Microglia, Age of Onset, Genetic Predisposition to Disease, Gene Regulatory Networks

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