Cited by 161Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeuroscience and Neuropharmacology Research

Microglial TYROBP/DAP12 in Alzheimer's Disease: Transduction of Physiological and Pathological Signals Across TREM2

Open access
Haure-Mirande, Jean-Vianney, Audrain, Mickael, Ehrlich, Michelle E., Gandy, Sam·2022·Molecular Neurodegeneration

Abstract

TYROBP (also known as DAP12 or KARAP) is a transmembrane adaptor protein initially described as a receptor-activating subunit component of natural killer (NK) cells. TYROBP is expressed in numerous cell types, including peripheral blood monocytes, macrophages, dendritic cells, and osteoclasts, but a key point of recent interest is related to the critical role played by TYROBP in the function of many receptors expressed on the plasma membrane of microglia. TYROBP is the downstream adaptor and putative signaling partner for several receptors implicated in Alzheimer’s disease (AD), including SIRP1β, CD33, CR3, and TREM2. TYROBP has received much of its current notoriety because of its importance in brain homeostasis by signal transduction across those receptors. In this review, we provide an overview of evidence indicating that the biology of TYROBP extends beyond its interaction with these four ligand-binding ectodomain-intramembranous domain molecules. In addition to reviewing the structure and localization of TYROBP, we discuss our recent progress using mouse models of either cerebral amyloidosis or tauopathy that were engineered to be TYROBP-deficient or TYROBP-overexpressing. Remarkably, constitutively TYROBP-deficient mice provided a model of genetic resilience to either of the defining proteinopathies of AD. Learning behavior and synaptic electrophysiological function were preserved at normal physiological levels even in the face of robust cerebral amyloidosis (in APP/PSEN1 ; Tyrobp −/− mice) or tauopathy (in MAPT P301S ; Tyrobp −/− mice). A fundamental underpinning of the functional synaptic dysfunction associated with each proteotype was an accumulation of complement C1q. TYROBP deficiency prevented C1q accumulation associated with either proteinopathy. Based on these data, we speculate that TYROBP plays a key role in the microglial sensome and the emergence of the disease-associated microglia (DAM) phenotype. TYROBP may also play a key role in the loss of markers of synaptic integrity (e.g., synaptophysin-like immunoreactivity) that has long been held to be the feature of human AD molecular neuropathology that most closely correlates with concurrent clinical cognitive function.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1186/s13024-022-00552-w

Cites

142 of 143 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • PU.1 induces the transcription of several surface receptors, such as ITGAM, VCAM1, TREM2, and TYROBP, thereby enhancing microglial phagocytic capacity for Aβ clearance.

    “As shown in Figure 1, previous studies showed that PU.1 induces the transcription of several surface receptors, such as Integrin subunit alpha M (ITGAM, also known as CD11b), vascular cell adhesion molecule 1 (VCAM1, also known as CD106), TREM2, and TYROBP [32, 55], thereby enhancing microglial phagocytic capacity for Aβ clearance [56, 57].”

    From Targeting Microglial Transcriptional Reprogramming as a Therapy Strategy for Alzheimer's Disease (2026) · cites this paper as [56]

    The section “TYROBP: A hub for phagocytosis signaling pathways?” links TYROBP and CD11b/ITGAM to microglial phagocytosis and amyloid clearance or compaction. The section “TYROBP, sensome, and microglial switching” also associates TREM2 with a phagocytosis-related microglial state. These passages do not establish that PU.1 induces transcription of the listed genes, include VCAM1 in that mechanism, or show that PU.1 thereby enhances Aβ clearance; no page numbers were available in our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • TYROBP is a key regulator of this gene-network module, driving the expression of other genes.

    “TYROBP is a key regulator of this gene-network module, driving the expression of other genes.”

    From The effect of Abi3 locus deletion on the progression of Alzheimer’s disease-related pathologies (2023) · cites this paper as [48]

    The Background and “TYROBP in Alzheimer’s disease” sections describe TYROBP as a key network hub and driver in sporadic late-onset Alzheimer’s disease. The “TYROBP: A hub for phagocytosis signaling pathways?” section reports altered Itgam expression when TYROBP is deleted, but the copy does not establish that TYROBP drives expression of other genes across the specified network module. The indexed passages provide section labels but no page numbers. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • TYROBP is the downstream signaling mediator of several microglial receptors implicated in AD, such as TREM2 and CD33.

    “Interestingly, it is also the downstream signaling mediator of several microglial receptors that are implicated in AD, such as TREM2 and CD33 (41, 48).”

    From The effect of Abi3 locus deletion on the progression of Alzheimer’s disease-related pathologies (2023) · cites this paper as [48]

    The Abstract identifies TYROBP as a downstream adaptor and putative signaling partner for AD-implicated receptors including TREM2 and CD33. The “TYROBP receptors in the brain” section supports signaling through TYROBP for TREM2, but says only that mouse CD33 is suggested to signal through it; human CD33 instead has ITIM motifs and associates with SHP-1. The claim omits that qualification for CD33. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. [53]Tomasello E Cant C Buhring HJ Vely F Andre P Seiffert M Ullrich A Vivier E Association of signal-regulatory proteins beta with KARAP/DAP-12 Eur J Immunol 2000 30 2147 2156 10.1002/1521-4141(2000)30:8<2147::AID-IMMU2147>3.0.CO;2-1 10940905 · DOI

Cited by

Sorted by citations

Authors
Haure-Mirande, J.-V., Audrain, M., Ehrlich, M. E., & Gandy, S.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • James J. Peters VA Medical Center (US)
Corresponding author
  • Ehrlich, Michelle E.
  • Gandy, Sam
Venue
Molecular Neurodegeneration
Published
2022-08-24
Volume
17
Issue
1
Pages
55-55
ISSN
1750-1326 (ISSN-L)
OpenAlex
W4292939095
Cited by
159
References
142
Citations by year
2026: 41 · 2025: 41 · 2024: 47 · 2023: 28 · 2022: 2
FWCI
3.07
Type
journal article
Language
en
Open access
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute on Aging (U01AG046170, R01AG057907, R03AG070710)
  • Cure Alzheimer's Fund
  • BrightFocus Foundation (A2018253F, A2016482F)
  • Mount Sinai Alzheimer’s Disease Research Center (AG005138, P30AG066514)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
TYROBP, DAP12, Alzheimer's disease, microglia, TREM2, C1q, cerebral amyloidosis, tauopathy, disease-associated microglia, synaptic dysfunction, synaptophysin, receptor signaling
MeSH terms
Alzheimer Disease, Amyloidosis, Animals, Brain, Disease Models, Animal, Membrane Glycoproteins, Membrane Proteins, Receptors, Immunologic, Microglia, Tauopathies, Adaptor Proteins, Signal Transducing, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review