| 1998 |
DAP12 (TYROBP) associates non-covalently with the activating NK cell receptor CD94/NKG2C; charged residues in the transmembrane domains of DAP12 and NKG2C are required for this interaction, and DAP12 is necessary for efficient cell-surface expression of CD94/NKG2C. |
Co-immunoprecipitation, transfection studies with transmembrane domain mutants, flow cytometry |
Immunity |
High |
9655483
|
| 1998 |
Mouse DAP12 associates with Ly-49D and Ly-49H activating NK cell receptors; co-transfection of Ly-49D or Ly-49H with DAP12 induces surface expression of both proteins, and cross-linking the complex induces tyrosine phosphorylation of multiple cellular substrates. |
Co-immunoprecipitation from transfected cells, functional phosphorylation assay |
Journal of Immunology |
High |
9647200
|
| 1998 |
DAP12-mediated signal transduction in NK cells proceeds predominantly through the Syk protein tyrosine kinase (not ZAP-70); ligation of Ly49D/DAP12 leads to tyrosine phosphorylation of PLCγ1, Cbl, and p44/p42 MAPK, as well as calcium mobilization, and these events are blocked by dominant-negative Syk. |
In vitro signaling assays, dominant-negative kinase transfection, immunoprecipitation, calcium flux assay |
Journal of Biological Chemistry |
High |
9830044
|
| 1998 |
Mouse KARAP/DAP12 is a signaling transmembrane subunit whose transduction function depends on the integrity of its intracytoplasmic ITAM; point mutations disrupting the ITAM abolish signaling. DAP12 is a disulfide-linked homodimer expressed broadly in hematopoietic cells. |
Point mutation and transfection studies, ITAM mutagenesis |
Journal of Biological Chemistry |
High |
9852069
|
| 1999 |
MDL-1, a C-type lectin myeloid receptor, associates with DAP12 through a charged transmembrane residue; MDL-1/DAP12 complex cross-linking results in calcium mobilization in J774 macrophage cells. |
Molecular cloning, co-expression/co-IP, calcium mobilization assay |
PNAS |
High |
10449773
|
| 1999 |
Ly49H associates with DAP12; engagement of the Ly49H/DAP12 complex results in DAP12 phosphorylation, intracellular calcium mobilization, and TNF secretion in transfected cells. |
Co-immunoprecipitation, phosphorylation assay, calcium mobilization, TNF secretion assay |
Journal of Leukocyte Biology |
High |
10411005
|
| 1999 |
KAP10 (DAP10), encoded within 100 bp of the DAP12 locus, is a distinct transmembrane adapter that signals through PI3K/Akt via a YINM motif—distinct from DAP12's ITAM-based Syk/ZAP-70 pathway. |
Molecular cloning, transfection, co-IP, Akt activation assay |
Journal of Immunology |
High |
10528161
|
| 2000 |
Loss-of-function mutations (a large deletion in Finnish patients and a point mutation in a Japanese patient) in TYROBP (DAP12) cause Nasu-Hakola disease (presenile dementia with bone cysts), establishing DAP12 as an essential signaling element beyond NK cells. |
Human genetic analysis, deletion/mutation identification, functional NK cell assays showing no NK defect |
Nature Genetics |
High |
10888890
|
| 2000 |
DAP10 and DAP12 form distinct, receptor-specific complexes in NK cells; their transmembrane regions are sufficient to confer specific association with respective partners. Synergy exists in cytokine production when both DAP10- and DAP12-associated receptors are co-engaged, with DAP12 activating Syk/ZAP70 and DAP10 activating PI3K. |
Receptor reconstitution in transfectants, co-IP, cytotoxicity and cytokine production assays |
Journal of Experimental Medicine |
High |
11015446
|
| 2000 |
SIRPβ1 forms an oligomeric complex with DAP12 in monocytes and transfected cells; SIRPβ1 engagement via DAP12 recruits Syk and triggers serotonin release, establishing SIRPβ1 as an activating DAP12-paired receptor. |
Co-immunoprecipitation, Syk recruitment assay, degranulation assay in RBL transfectants |
European Journal of Immunology |
High |
10604985 10940905
|
| 2000 |
KARAP/DAP12 loss-of-function (nonfunctional ITAM knockin) mice exhibit restricted NK cell natural cytotoxicity and dramatic accumulation of dendritic cells in mucocutaneous epithelia, demonstrating specific non-redundant roles in innate immunity. |
Knockin mouse model, NK cytotoxicity assays, DC subset analysis, contact sensitivity assays |
Immunity |
High |
11021533
|
| 2001 |
TREM-2 is a DAP12-associated receptor expressed in mouse macrophages; cross-linking of TREM-2a on macrophage surfaces leads to nitric oxide release, demonstrating functional signaling through the TREM-2/DAP12 complex. |
cDNA library screening using DAP12 surface expression as readout, co-IP of TREM-2a with endogenous DAP12, nitric oxide release assay |
European Journal of Immunology |
High |
11241283
|
| 2003 |
DAP12-deficient mice develop osteopetrosis (increased bone mass) and thalamic hypomyelinosis; in vitro osteoclast induction from DAP12−/− bone marrow yields immature cells with attenuated bone resorption, indicating a developmental arrest of osteoclasts and oligodendrocytes. |
DAP12 knockout mouse, bone density analysis, in vitro osteoclastogenesis, electrophysiology, prepulse inhibition assay |
Journal of Clinical Investigation |
High |
12569157
|
| 2003 |
DAP12 signaling regulates multinucleation of osteoclasts; DAP12−/− precursors form only mononuclear osteoclast-like cells with reduced bone resorption, and retroviral reconstitution of DAP12 rescues multinucleation. TREM2 is identified as a DAP12-associated receptor on osteoclasts. |
DAP12 knockout mouse, retroviral reconstitution, in vitro osteoclastogenesis, bone resorption assay, RT-PCR for DAP12-associated receptors |
Journal of Bone and Mineral Research |
High |
14969392
|
| 2003 |
Loss-of-function mutations in DAP12 or TREM2 result in inefficient and delayed osteoclast differentiation with markedly reduced bone resorption capability in vitro, from peripheral blood mononuclear cells of PLOSL patients. |
In vitro osteoclastogenesis from patient-derived cells, bone resorption assay |
Journal of Experimental Medicine |
High |
12925681
|
| 2003 |
DAP12-deficient osteoclast precursors fail to differentiate normally; when plated on osteopontin, DAP12−/− pre-osteoclasts do not activate Syk, and fail to phosphorylate c-Src or Pyk2, which are required for osteoclast cytoskeletal organization. Syk-deficient macrophages also fail to undergo normal osteoclastogenesis. |
DAP12 knockout mouse, Syk kinase assay, phosphorylation of c-Src/Pyk2, migration assay, cytoskeletal analysis |
Journal of Cellular Biochemistry |
High |
14624447
|
| 2003 |
In activated mouse NK cells, NKG2D associates with both DAP10 and DAP12; the DAP10-PI3K pathway is sufficient for NKG2D-mediated cytotoxicity in cells lacking DAP12 or Syk/ZAP70, whereas DAP12 is required for cytokine production, demonstrating functional divergence. |
DAP12 knockout mice, Syk/ZAP70 double-knockout mice, PI3K inhibition, NK cell cytotoxicity and cytokine assays |
Nature Immunology |
High |
12740576
|
| 2004 |
KARAP/DAP12 is expressed exclusively in microglia (not neurons, astrocytes, or oligodendrocytes) in the brain; DAP12/KARAP deficiency alters synaptic glutamate receptor content (decreased GluR2 in postsynaptic densities, increased GluR2-lacking AMPARs), enhances LTP, and reduces synaptic TrkB levels, demonstrating a microglia-neuron signaling role. |
DAP12 knockout mouse, electrophysiology (LTP, AMPAR rectification, NMDAR pharmacology), biochemical fractionation, cell-type specific immunostaining |
Journal of Neuroscience |
High |
15601948
|
| 2004 |
NKp44 surface expression and NK cell activation requires noncovalent association with DAP12 via lysine-183 in the NKp44 transmembrane domain; the ITIM-like motif in NKp44's cytoplasmic domain lacks inhibitory capacity and does not affect activation. |
Transmembrane domain mutagenesis, co-IP, redirected cytotoxicity assay, pervanadate phosphorylation, surface expression analysis |
Journal of Immunology |
High |
14707061
|
| 2004 |
Mouse NKG2D associates with DAP12 via structural features in its transmembrane domain; human NKG2D cannot associate with DAP12 due to structural differences in its transmembrane region, and human NKG2D function is normal in DAP12-deficient patients, showing DAP10 is sufficient for human NKG2D signaling. |
Human patient studies (DAP12-deficient), transmembrane chimeric constructs, co-IP |
Journal of Immunology |
High |
15294961
|
| 2005 |
DAP12-deficient macrophages produce higher concentrations of inflammatory cytokines in response to TLR stimulation; Syk-deficient macrophages show an identical phenotype, demonstrating that DAP12 negatively regulates TLR signaling through Syk downstream of DAP12-pairing receptors. |
DAP12 and Syk knockout mouse macrophages, TLR stimulation cytokine production assays, endotoxic shock model |
Nature Immunology |
High |
15895090
|
| 2005 |
Plexin-A1 associates with TREM-2 and links semaphorin signaling to DAP12/ITAM pathway in dendritic cells and osteoclasts, revealing a novel receptor-adapter interaction with roles in both immune responses and bone homeostasis. |
Plexin-A1 knockout mice, co-immunoprecipitation of plexin-A1 with TREM-2/DAP12 complex, bone and immune phenotyping |
Nature Cell Biology |
High |
16715077
|
| 2006 |
Src-family kinases (Fyn and Lck) physically associate with and phosphorylate the Ly49D/DAP12 complex; CD45 acts as a phosphatase for DAP12 itself, and CD45-null NK cells show hyperphosphorylated DAP12 with defective calcium mobilization and cytokine production upon Ly49D ligation. |
Co-immunoprecipitation from NK cells, Src kinase inhibition, Fyn/Lck knockout mice, CD45-null NK cell analysis |
Journal of Immunology |
High |
16709819
|
| 2007 |
Non-T cell activation linker (NTAL) is phosphorylated downstream of TREM-1/DAP12 engagement in myeloid cells; NTAL knockdown enhances ERK1/2 phosphorylation and reduces calcium mobilization, and increases TNF-α and IL-8 production, identifying NTAL as a negative regulator of DAP12-mediated signaling. |
RNA interference knockdown, phosphorylation assays, calcium mobilization assay, cytokine ELISA in myeloid cell lines and primary granulocytes |
Journal of Immunology |
High |
17277102
|
| 2008 |
DAP12 signaling through TREM-2 and downstream Syk is required for cytokine-induced macrophage fusion into multinucleated giant cells; DAP12 overexpression potentiates fusion and modulates expression of fusion mediators DC-STAMP and Cadherin-1. |
DAP12 knockout mice, Syk genetic analysis, overexpression, gene expression profiling |
Science Signaling |
High |
18957693
|
| 2009 |
MDL-1 associates with both DAP12 and DAP10 in osteoclasts, forming trimolecular MDL-1/DAP12/DAP10 complexes; DAP10-deficient mice develop osteopetrosis with reduced osteoclasts, and MDL-1 stimulation augments osteoclastogenesis in vitro. |
DAP10 knockout mice, co-IP of trimolecular complex, in vitro osteoclastogenesis assay, bone density analysis |
PNAS |
High |
19251634
|
| 2010 |
TREM2 ligation activates PI3K, ERK1/2, and Vav3, induces intracellular calcium mobilization and actin reorganization downstream of DAP12. DAP10 is required for TREM2/DAP12-dependent PI3K recruitment to the signaling complex. SHIP1 inhibits this pathway by binding DAP12 in an SH2-dependent manner and blocking PI3K recruitment. |
TREM2 ligation assays, PI3K recruitment co-IP, Vav3 activation assay, calcium flux, actin staining, SHIP1 SH2 domain mutant analysis |
Science Signaling |
High |
20484116
|
| 2010 |
DAP12 is required for macrophage chemotaxis toward CCL2 and recruitment to the lung; ITAM phosphorylation of DAP12 is required for normal migration, and TREM2 association with DAP12 is sufficient to restore migration, establishing DAP12 as a regulator of macrophage chemotaxis. |
DAP12 knockout mice, scratch assay, CCL2 chemotaxis assay, airway CCL2 challenge, reconstitution with ITAM phosphorylation mutants |
Journal of Immunology |
High |
20421649
|
| 2011 |
OSCAR (osteoclast-associated receptor) is an FcRγ-associated DAP12-independent costimulatory receptor in osteoclastogenesis; in DAP12-deficient humans and mice, OSCAR-FcRγ pathway compensates for osteoclast maturation, and OSCAR's ligand is identified as specific motifs in fibrillar collagens in bone ECM. |
DAP12-deficient patient/mouse samples, OSCAR knockout mice, collagen binding assay, in vitro osteoclastogenesis, in vivo bone analysis |
Journal of Clinical Investigation |
High |
21841309
|
| 2011 |
MAIR-II (CD300d) is a DAP12-associated receptor on B cells; DAP12-deficient B cells show enhanced proliferation, and a chimeric MAIR-II-DAP12 receptor suppresses BCR-mediated proliferation by recruiting SHP-1, establishing that DAP12-coupled MAIR-II negatively regulates B cell adaptive immune responses. |
DAP12 knockout mice and human NHD patient B cells, chimeric receptor reconstitution, SHP-1 co-IP, proliferation assays |
Journal of Experimental Medicine |
High |
21727189
|
| 2012 |
Siglec-15 associates with DAP12 through Lys-274 (Lys-272 in mouse) in its transmembrane domain, forming a Siglec-15-DAP12-Syk signaling cascade; this complex is required for functional osteoclast formation, actin-ring organization, and bone resorption. |
Co-IP, transmembrane domain mutagenesis (K272A), siRNA knockdown, chimeric receptor rescue, bone resorption assay |
Journal of Biological Chemistry |
High |
22451653
|
| 2012 |
Siglec-15 signals through DAP12-Syk to enhance TGF-β secretion from monocytes/macrophages upon recognition of sialyl-Tn tumor antigen; disruption of Siglec-15/DAP12 interaction (K274A mutant) or Syk inhibition abrogates this response. |
Co-culture model, Syk inhibitor, K274A Siglec-15 mutant, cytokine ELISA |
Glycobiology |
High |
23035012
|
| 2013 |
DOK3 physically associates with the ITAM of DAP12 through its phosphotyrosine-binding domain; upon LPS stimulation, DAP12- and Src-dependent phosphorylation of DOK3 leads to its translocation to the plasma membrane, and DOK3 deficiency increases proinflammatory cytokine production, establishing DOK3 as a mediator of DAP12's inhibitory function at TLR4. |
Co-IP (DAP12 ITAM pulldown), phosphorylation assays, DOK3 knockout macrophages and mice, cytokine assays |
Science Signaling |
High |
23962980
|
| 2015 |
DAP12 stabilizes the C-terminal fragment of TREM2 (TREM2-CTF), a γ-secretase substrate; a DAP12 mutant that cannot interact with TREM2 fails to stabilize TREM2-CTF. Silencing Trem2 or Dap12 exacerbates LPS-induced pro-inflammatory responses in microglia. |
Co-expression and co-IP with interaction mutant, siRNA knockdown, LPS stimulation cytokine assay |
Journal of Biological Chemistry |
High |
25957402
|
| 2015 |
DAP12 is required in microglia downstream of CSF1R for nerve injury- and intrathecal CSF1-induced upregulation of pain-related microglial genes and neuropathic pain behaviors, but not for microglial proliferation. |
DAP12 knockout mice, conditional Csf1 deletion in sensory neurons, intrathecal CSF1 injection, behavioral pain assays, microglial gene expression profiling |
Nature Neuroscience |
High |
26642091
|
| 2007 |
Btk is phosphorylated upon TREM-1/DAP12 engagement; Btk knockdown reduces ERK1/2 and PLCγ1 phosphorylation and Ca2+ mobilization after TREM-1 stimulation, and impairs TNF-α and IL-8 production, identifying Btk as a positive regulator in the TREM-1/DAP12 ITAM signaling pathway. |
shRNA knockdown, Btk knockout mouse BMDCs, phosphorylation assays, Btk domain mutants, cytokine ELISA, human XLA patient cells |
Blood |
High |
21659545
|
| 2007 |
KARAP/DAP12 plays a pivotal role in NK cell-mediated resistance to murine CMV infection via the Ly49H/DAP12-associated receptor; DAP12 ITAM mutant mice show 30–40-fold higher splenic viral titers and reduced IFN-γ production by hepatic NK cells. |
KARAP/DAP12 ITAM knockin mutant mice, viral titer assay, IFN-γ intracellular staining of NK cells |
Journal of Experimental Medicine |
High |
11927627
|
| 2007 |
In CD4+CD28null T cells lacking DAP12, stimulatory KIR2DS2 signals selectively through JNK (not ERK); presence of DAP12 enables ERK phosphorylation, converting KIR2DS2 from a costimulatory to a fully stimulatory molecule capable of inducing cytotoxicity—demonstrated by KIR2DS2 transmembrane lysine mutant abolishing JNK activation. |
KIR2DS2 transmembrane domain mutagenesis, signaling assays (JNK, ERK phosphorylation), cytotoxicity assays, T cell clones with/without DAP12 |
Journal of Immunology |
High |
15356118
|
| 2007 |
PU.1 directly binds to evolutionarily conserved PU.1 consensus sites in the proximal Dap12 promoter and is required for myeloid-specific Dap12 transcription; PU.1 knockdown reduces endogenous Dap12 expression and PU.1 re-expression in PU.1−/− progenitors induces Dap12 transcription. |
Reporter assays, site-directed mutagenesis, EMSA, chromatin immunoprecipitation, PU.1 RNAi, PU.1−/− progenitor reconstitution |
Journal of Leukocyte Biology |
High |
17827340
|
| 2014 |
αvβ3 integrin occupancy induces DAP12 ITAM phosphorylation in osteoclasts; combined deletion of DAP12 and αvβ3 (but not DAP12 and β1) causes severe osteopetrosis, and OSCAR/FcRγ activation cannot rescue DAP12−/− osteoclasts lacking αvβ3 because Syk phosphorylation does not occur in this context. |
β3/DAP12 double-knockout mice, Syk phosphorylation assay, OSCAR activation rescue experiment, bone density analysis |
Journal of Cell Biology |
High |
25547154
|
| 2017 |
TREM2/DAP12 signaling in microglia promotes proinflammatory cytokine secretion following spinal nerve injury; agonistic anti-TREM2 antibody induces proinflammatory cytokine expression and neuropathic pain in wild-type but not Dap12-deficient mice, placing TREM2 upstream of DAP12 in microglial pain signaling. |
DAP12 knockout mice, intrathecal TREM2 agonistic antibody, cytokine assays, behavioral pain assays |
Journal of Neuroscience |
High |
27798193
|
| 2017 |
The TREM2/DAP12 complex suppresses LPS-induced microglial hyperactivation through the JNK signaling pathway; LPS downregulates TREM2 via JNK and NF-κB, and DAP12's anti-inflammatory role requires the presence of TREM2. |
siRNA knockdown, JNK inhibition, LPS stimulation cytokine assays, NF-κB reporter assays |
Frontiers in Aging Neuroscience |
Medium |
28680398
|
| 2017 |
TYROBP (DAP12) deficiency in APP/PSEN1 mice preserves electrophysiological function and learning behavior; TYROBP deficiency prevents accumulation of complement C1q associated with cerebral amyloidosis and represses the induction of disease-associated microglia (DAM) genes including TREM2, C1q, and Clec7a. |
TYROBP knockout crossed to APP/PSEN1 AD mouse model, transcriptomics, electrophysiology, behavioral assays, complement staining |
Acta Neuropathologica / Molecular Psychiatry |
High |
28612290 30283032
|
| 2023 |
Single-nucleus RNA-sequencing of brain specimens from DAP12-deficient NHD patients revealed a unique microglia signature of heightened RUNX1, STAT3, and TGF-β signaling pathways mediating wound-healing responses; this was associated with a wound-healing astrocyte signature, impaired myelination in oligodendrocytes, and vascular pericyte abnormalities—demonstrating that DAP12 normally attenuates microglial wound-healing pathways. |
Single-nucleus RNA-sequencing of human NHD patient brain specimens and DAP12-signaling-deficient mouse brain |
Nature Immunology |
High |
36658241
|