{"gene":"HCST","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1999,"finding":"DAP10 (HCST/KAP10) forms an activating immunoreceptor complex with NKG2D on NK and T cells, and the DAP10 cytoplasmic YINM (YxxM) motif recruits the p85 subunit of PI3-kinase, enabling NKG2D-dependent signal transduction in response to MICA.","method":"Biochemical co-immunoprecipitation, transfection assays, SH2 domain-binding assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP and functional binding assay, independently replicated across multiple subsequent labs","pmids":["10426994"],"is_preprint":false},{"year":1999,"finding":"KAP10 (DAP10/HCST) binds PI3-kinase upon phosphorylation of its cytoplasmic YINM motif, activating Akt, and also binds the adaptor protein Grb2; KAP10 is genetically encoded within ~100 bp of the DAP12 locus on chromosome 19.","method":"Molecular cloning, transfection, biochemical binding assays (PI3K and Grb2 co-precipitation), Akt activation assay","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical methods in one study, corroborated by independent labs","pmids":["10528161"],"is_preprint":false},{"year":2000,"finding":"DAP10 and DAP12 form distinct, specific receptor complexes in NK cells; the transmembrane regions of DAP10 and DAP12 are sufficient to confer specific association with their respective ligand-binding partners, and DAP10 signals via the PI3K (YxNM) pathway while DAP12 signals via Syk/ZAP70 through its ITAM motif.","method":"Transfectant cell lines, co-immunoprecipitation, mutant transmembrane domain constructs, cytotoxicity assays, cytokine production assays","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mutants, multiple functional readouts, replicated","pmids":["11015446"],"is_preprint":false},{"year":2003,"finding":"The YINM motif in the DAP10 cytoplasmic tail couples NKG2D stimulation to downstream activation of PI3K, Vav1, Rho family GTPases, and PLC, leading to NK cell killing in a Syk-family kinase-independent manner.","method":"Biochemical signaling assays, dominant-negative constructs, NK cytotoxicity assays","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal signaling assays with defined motif, replicated by independent labs","pmids":["12740575"],"is_preprint":false},{"year":2004,"finding":"Vav1 is specifically required for DAP10-mediated NK cell cytotoxicity, whereas Vav2 and Vav3 are required for FcRγ- and DAP12-mediated cytotoxicity; genetic epistasis using mice lacking one, two, or all three Vav proteins places Vav1 specifically downstream of DAP10.","method":"Genetic epistasis using Vav1/Vav2/Vav3 knockout mice, NK cytotoxicity assays","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple knockout combinations, clear functional readout","pmids":["15365099"],"is_preprint":false},{"year":2006,"finding":"DAP10 recruits a Grb2-Vav1 intermediate complex as well as p85 PI3K; Grb2-Vav1 binding to DAP10 initiates tyrosine phosphorylation events, but full calcium release and cytotoxicity require both Grb2-Vav1 and p85 to bind DAP10 simultaneously.","method":"Co-immunoprecipitation, phosphorylation assays, calcium flux assays, NK cytotoxicity assays, dominant-negative constructs","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, calcium, cytotoxicity), single lab with rigorous controls","pmids":["16582911"],"is_preprint":false},{"year":2006,"finding":"Vav1 interacts with DAP10 YxNM motifs through Grb2 and is required for DAP10-induced NK cell cytoskeletal polarization (actin and microtubule networks), maturation of the cytolytic synapse, target cell lysis, and PI3K-dependent Akt signaling.","method":"Vav1/DAP12 double-knockout mice, co-immunoprecipitation, confocal microscopy of cytoskeletal polarization, cytotoxicity assays, Akt phosphorylation assay","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, Co-IP, microscopy, and signaling assays in one study","pmids":["16887996"],"is_preprint":false},{"year":2006,"finding":"IL-21 down-regulates DAP10 (HCST) expression in human NK and CD8+ T cells by reducing DAP10 promoter activity, leading to decreased NKG2D surface expression and impaired NKG2D-mediated NK cell functions.","method":"DAP10 luciferase reporter assay, RT-PCR, flow cytometry, redirected lysis and degranulation assays","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus functional readouts, single lab","pmids":["16424177"],"is_preprint":false},{"year":2009,"finding":"DAP10 associates with the receptor MDL-1 in osteoclasts; MDL-1 associates with both DAP12 and DAP10 to form trimolecular MDL-1–DAP12/DAP10 complexes, and DAP10-deficient mice develop osteopetrosis with reduced osteoclast numbers, demonstrating DAP10's role in osteoclastogenesis and bone remodeling.","method":"DAP10-deficient mouse model, co-immunoprecipitation, osteoclast differentiation assays, bone histology","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse phenotype plus reciprocal Co-IP identifying the receptor partner","pmids":["19251634"],"is_preprint":false},{"year":2009,"finding":"Ly49H must associate with and signal via DAP10 (in addition to DAP12) for optimal NK cell function during mouse cytomegalovirus infection; DAP10-deficient Ly49H+ NK cells show impaired ERK1/2 activation, reduced IFN-γ production, and diminished MCMV control.","method":"DAP10-deficient mice, MCMV infection model, flow cytometry, ERK phosphorylation assay, IFN-γ production assay","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO in defined infection model with multiple signaling readouts","pmids":["19332875"],"is_preprint":false},{"year":2009,"finding":"Upon NK cell activation by MICB-expressing target cells, the NKG2D/DAP10 complex undergoes lysosomal degradation; DAP10 traffics to secretory lysosomes and polarizes to the cytotoxic immune synapse, with ~50% of total NKG2D protein degraded coincident with synapse recruitment.","method":"Confocal microscopy, subcellular fractionation, flow cytometry, immunoblot in primary NK cells and NKL cell line","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by microscopy and fractionation, single lab, two orthogonal methods","pmids":["19329438"],"is_preprint":false},{"year":2010,"finding":"DAP10 plays a key role in TREM2- and DAP12-dependent recruitment of PI3K to the signaling complex; SHIP1 inhibits TREM2/DAP12 signaling by binding DAP12 in an SH2 domain-dependent manner to prevent PI3K recruitment, while DAP10 enables PI3K activation downstream of TREM2-DAP12 in osteoclasts/macrophages.","method":"Co-immunoprecipitation, PI3K activity assay, calcium mobilization assay, actin reorganization assay, siRNA knockdown","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, calcium, actin), rigorous controls","pmids":["20484116"],"is_preprint":false},{"year":2011,"finding":"IL-2 up-regulates DAP10 protein expression largely post-transcriptionally and induces DAP10 glycosylation, which is required for DAP10 association with NKG2D and stabilization of NKG2D surface expression; TGF-β1 has an opposite and dominant effect by inhibiting RNA polymerase II association with the DAP10 promoter, decreasing DAP10 mRNA and protein and consequently NKG2D.","method":"Metabolic labeling, glycosylation inhibitor treatment, co-immunoprecipitation, ChIP (RNA Pol II), RT-PCR, flow cytometry, immunoblot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including ChIP, glycosylation studies, and Co-IP in one study","pmids":["21816829"],"is_preprint":false},{"year":2014,"finding":"DAP10 associates with RAGE in human keratinocytes; RAGE-DAP10 heterodimer formation markedly enhances Akt activation, whereas RAGE-RAGE homomultimers activate caspase-8/apoptosis; functional blocking of DAP10 abrogates S100A8/A9-stimulated Akt phosphorylation and increases apoptosis.","method":"Co-immunoprecipitation, artificial oligomerization constructs, Akt phosphorylation assay, caspase-8 assay, DAP10 functional blocking antibody, cell viability assay","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional blocking with signaling readouts, single lab","pmids":["25002577"],"is_preprint":false},{"year":2015,"finding":"Ligand-induced endocytosis of NKG2D-DAP10 complexes depends on ubiquitylation of DAP10 and is required for degradation of internalized complexes; this ubiquitin-dependent endocytosis is also required for ERK activation and NK cell effector functions (cytotoxic granule secretion and IFN-γ production).","method":"Biochemical ubiquitylation assays, endocytosis assays with ubiquitylation-deficient DAP10 mutants, confocal microscopy, ERK phosphorylation assay, degranulation and cytokine assays in human NK cells","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutagenesis of ubiquitylation sites combined with multiple functional readouts, orthogonal methods","pmids":["26508790"],"is_preprint":false},{"year":2019,"finding":"NKG2D-DAP10 signaling recruits the actin regulatory protein EVL to the NK cell cytotoxic synapse via the DAP10 binding site previously implicated in Grb2/Vav1 recruitment; EVL interacts with WASP and VASP and is required for F-actin generation, integrin-mediated adhesion, and NK cell cytotoxicity.","method":"Co-immunoprecipitation, confocal microscopy, siRNA knockdown, actin polymerization assays, adhesion and cytotoxicity assays","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, microscopy, KD with functional readouts) in one study","pmids":["31235500"],"is_preprint":false},{"year":2011,"finding":"TGF-β1 down-regulates NKG2D and DAP10 expression on human NK cells, impairing NK cell cytotoxicity and IFN-γ production; anti-TGF-β1 antibodies restore NKG2D and DAP10 expression in vitro.","method":"In vitro treatment of primary NK cells with TGF-β1, flow cytometry, anti-TGF-β1 antibody rescue, cytotoxicity and IFN-γ assays","journal":"PLoS Pathogens","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — flow cytometry and functional assays with antibody rescue, single lab","pmids":["22438812"],"is_preprint":false},{"year":2003,"finding":"SIRPβ1 can associate with DAP10 in RBL-2H3 transfectants; however, engagement of SIRPβ1:DAP10 complexes alone does not induce serotonin release or TNF secretion (negative finding), but does co-stimulate RBL-2H3 effector function when sub-optimal FcεRI signaling is present.","method":"Transfectant cell lines, co-immunoprecipitation, serotonin release assay, TNF secretion assay, co-stimulation assay","journal":"European Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and functional assays in transfected cell line, single lab","pmids":["14635062"],"is_preprint":false},{"year":2009,"finding":"DAP10 associates with Ly49H and Ly49D in primary NK cells in vivo, but this association has no significant impact on Ly49H-mediated control of murine cytomegalovirus infection under physiological conditions (DAP10's contribution to Ly49D/H function is minimal in vivo).","method":"DAP10-deficient mice, co-immunoprecipitation from primary NK cells, MCMV infection model, flow cytometry","journal":"European Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP from primary cells plus in vivo infection model, single lab","pmids":["19247984"],"is_preprint":false},{"year":2011,"finding":"In rat and mouse (but not human), CD94 — rather than NKG2C/E — associates with DAP12 and DAP10 through a transmembrane lysine residue unique to rodent CD94, enabling NK cell activation; this differs from the human system where NKG2C bears the DAP12-interacting residue.","method":"Biochemical analysis (co-immunoprecipitation), flow cytometry, mutant NKG2C constructs, redirected lysis assays with transfected NK cells","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and mutagenesis with functional assay, single lab","pmids":["22084441"],"is_preprint":false},{"year":2007,"finding":"DAP10-deficient mice become osteopetrotic with age, with reduced osteoclasts, demonstrating an essential role for DAP10 signaling in normal bone remodeling.","method":"DAP10-deficient mouse model, histological bone analysis, osteoclast counting","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO with defined skeletal phenotype; also corroborated by the same paper reporting MDL-1 as the partner receptor","pmids":["19251634"],"is_preprint":false},{"year":2007,"finding":"DAP10 deficiency in mice leads to hyperactive NKT cell functions (increased cytokine production and cytotoxicity) and impaired CD4+CD25+ regulatory T cell activation, indicating that DAP10 signaling normally raises the activation threshold of autoreactive NKT cells and Tregs to maintain self-tolerance.","method":"DAP10-deficient mouse model, syngeneic tumor challenge, NKT cytotoxicity assays, Treg activation and cytokine assays","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with tumor model and multiple immune cell readouts, single lab","pmids":["17785813"],"is_preprint":false},{"year":2025,"finding":"ACLY deficiency in NK cells specifically reduces DAP10 and DAP12 transcript and protein levels through altered histone acetylation at the DAP10/DAP12 loci (as shown by epigenetic profiling), impairing activating receptor function; acetate supplementation restores DAP10/12 expression and receptor function, establishing that ACLY-generated cytosolic acetyl-CoA epigenetically regulates DAP10 expression.","method":"Inducible genetic KO mouse model (ACLY), RNA-seq, immunoblot, histone acetylation ChIP/epigenetic profiling, acetate rescue experiments, NK cytotoxicity and cytokine assays","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with epigenetic profiling and rescue experiment, multiple methods, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.03.05.639198"],"is_preprint":true}],"current_model":"DAP10 (HCST/KAP10) is a transmembrane adaptor protein that forms activating immunoreceptor complexes (primarily with NKG2D, but also MDL-1, RAGE, and other receptors) in NK, T, and myeloid cells; upon receptor ligation, a tyrosine in its cytoplasmic YINM motif is phosphorylated, recruiting both the p85 subunit of PI3K and a Grb2–Vav1 intermediate, which together—but not individually—drive full PI3K/Akt activation, Vav1-dependent cytoskeletal polarization (actin and microtubules), cytotoxic synapse maturation, and target cell lysis in a Syk-independent manner; ligand-induced ubiquitylation of DAP10 additionally triggers endocytosis of NKG2D–DAP10 complexes that is required for ERK activation and effector cytokine secretion; DAP10 expression is post-transcriptionally up-regulated by γc cytokines via DAP10 glycosylation (which stabilizes the NKG2D–DAP10 complex at the surface) and is down-regulated at the transcriptional level by TGF-β1 and IL-21, and epigenetically by loss of ACLY-generated acetyl-CoA; in vivo, DAP10 is essential for osteoclastogenesis and bone remodeling (DAP10-KO mice are osteopetrotic), optimal antiviral NK responses, and setting activation thresholds for NKT cells and regulatory T cells."},"narrative":{"mechanistic_narrative":"HCST (DAP10/KAP10) is a transmembrane adaptor that nucleates activating immunoreceptor complexes in NK, T, and myeloid lineages, coupling surface receptors to PI3K/Akt and cytoskeletal effector pathways that drive cytotoxicity and bone remodeling [PMID:10426994, PMID:12740575, PMID:19251634]. It partners chiefly with NKG2D but also assembles into complexes with MDL-1, RAGE, TREM2/DAP12, Ly49H, CD94, and SIRPβ1, with transmembrane-domain residues conferring receptor-pairing specificity [PMID:10426994, PMID:11015446, PMID:19251634, PMID:20484116, PMID:25002577]. On receptor ligation, the cytoplasmic YINM (YxxM) motif is tyrosine-phosphorylated and simultaneously recruits the p85 subunit of PI3K and a Grb2–Vav1 intermediate; both arms must engage DAP10 together to deliver full calcium flux, Akt signaling, and target lysis, doing so independently of Syk-family kinases [PMID:10426994, PMID:10528161, PMID:12740575, PMID:16582911]. Vav1 acting through this site directs Rho-family GTPase activation, actin and microtubule polarization, and cytolytic synapse maturation, and recruits the actin regulator EVL (which engages WASP/VASP) to generate F-actin and integrin-mediated adhesion [PMID:12740575, PMID:15365099, PMID:16887996, PMID:31235500]. Ligand-induced ubiquitylation of DAP10 triggers endocytosis and lysosomal degradation of NKG2D–DAP10 complexes, a step required for ERK activation, granule secretion, and IFN-γ production [PMID:19329438, PMID:26508790]. DAP10 abundance is set post-transcriptionally by γc-cytokine-induced glycosylation that stabilizes surface NKG2D, and is transcriptionally repressed by TGF-β1 and IL-21 [PMID:16424177, PMID:21816829, PMID:22438812]. In vivo, DAP10 is essential for osteoclastogenesis and bone remodeling, with DAP10-deficient mice becoming osteopetrotic, contributes to optimal antiviral NK responses, and raises the activation threshold of NKT and regulatory T cells to maintain self-tolerance [PMID:19251634, PMID:19332875, PMID:17785813].","teleology":[{"year":1999,"claim":"Established DAP10 as the activating adaptor for NKG2D and identified the YxxM/YINM motif as the docking site that links receptor ligation to PI3K and Akt, defining the core signaling output of the complex.","evidence":"Co-immunoprecipitation, transfection, SH2-binding and Akt activation assays in NK/T cells responding to MICA","pmids":["10426994","10528161"],"confidence":"High","gaps":["Did not resolve which kinase phosphorylates the YINM motif","Grb2 binding noted but its downstream role unestablished"]},{"year":2000,"claim":"Distinguished DAP10 from the ITAM adaptor DAP12, showing transmembrane regions dictate receptor-pairing specificity and that DAP10 signals via PI3K rather than Syk/ZAP70.","evidence":"Transfectants with mutant transmembrane domains, reciprocal Co-IP, cytotoxicity and cytokine readouts","pmids":["11015446"],"confidence":"High","gaps":["Mechanism of transmembrane assembly specificity not structurally defined"]},{"year":2003,"claim":"Mapped the DAP10 YINM motif to a Syk-independent cascade through PI3K, Vav1, Rho GTPases, and PLC driving NK killing, separating adaptor classes by their effector logic.","evidence":"Biochemical signaling and dominant-negative constructs with NK cytotoxicity assays","pmids":["12740575"],"confidence":"High","gaps":["How a single phosphomotif assembles multiple effectors was unresolved"]},{"year":2004,"claim":"Resolved Vav isoform specificity, placing Vav1 selectively downstream of DAP10 versus Vav2/Vav3 for FcRγ/DAP12, refining the cytoskeletal arm of the pathway.","evidence":"Genetic epistasis across Vav1/2/3 knockout mouse combinations with cytotoxicity assays","pmids":["15365099"],"confidence":"High","gaps":["Direct vs indirect Vav1 recruitment to DAP10 not yet defined"]},{"year":2006,"claim":"Showed DAP10 recruits both a Grb2-Vav1 intermediate and p85 PI3K, and that both must bind simultaneously for full calcium release and cytotoxicity, explaining how one motif coordinates two effector arms.","evidence":"Co-IP, phosphorylation, calcium flux and cytotoxicity assays with dominant-negative constructs; Vav1/DAP12 double-KO mice plus confocal microscopy","pmids":["16582911","16887996"],"confidence":"High","gaps":["Stoichiometry of simultaneous p85 and Grb2-Vav1 binding not structurally resolved"]},{"year":2006,"claim":"Identified IL-21 as a transcriptional repressor of DAP10 that lowers NKG2D surface expression and NK function, introducing cytokine control of the adaptor.","evidence":"DAP10 luciferase reporter, RT-PCR, flow cytometry, redirected lysis/degranulation in human NK and CD8 T cells","pmids":["16424177"],"confidence":"Medium","gaps":["Promoter elements and transcription factors mediating repression not mapped"]},{"year":2007,"claim":"Revealed an in vivo regulatory role beyond cytotoxicity, with DAP10 raising the activation threshold of NKT and regulatory T cells to preserve self-tolerance.","evidence":"DAP10-deficient mice, syngeneic tumor challenge, NKT cytotoxicity and Treg activation assays","pmids":["17785813"],"confidence":"Medium","gaps":["Receptor partner mediating NKT/Treg threshold-setting not identified","Single lab, mouse only"]},{"year":2009,"claim":"Extended DAP10 beyond lymphocytes by identifying MDL-1 as a myeloid partner and demonstrating an essential role in osteoclastogenesis, with DAP10-KO mice becoming osteopetrotic.","evidence":"DAP10-deficient mice, Co-IP, osteoclast differentiation assays, bone histology","pmids":["19251634"],"confidence":"High","gaps":["Signaling output of MDL-1-DAP10 in osteoclasts not fully dissected"]},{"year":2009,"claim":"Demonstrated DAP10's antiviral contribution, where Ly49H signaling via DAP10 supports ERK activation, IFN-γ, and MCMV control, though the magnitude of contribution was debated across studies.","evidence":"DAP10-deficient mice in MCMV model with ERK and IFN-γ readouts; reciprocal Co-IP from primary NK cells","pmids":["19332875","19247984"],"confidence":"High","gaps":["Conflicting estimates of in vivo importance of Ly49H-DAP10 coupling","Quantitative contribution relative to DAP12 unresolved"]},{"year":2009,"claim":"Linked complex fate to function by showing NKG2D-DAP10 traffics to secretory lysosomes and polarizes to the synapse while undergoing degradation, connecting receptor turnover to effector responses.","evidence":"Confocal microscopy, subcellular fractionation, immunoblot in primary NK cells and NKL line","pmids":["19329438"],"confidence":"Medium","gaps":["Degradation machinery not identified","Functional consequence of degradation not directly tested here"]},{"year":2010,"claim":"Positioned DAP10 as the PI3K-recruiting partner that complements TREM2/DAP12 signaling, opposed by SHIP1, integrating DAP10 into myeloid receptor circuits.","evidence":"Co-IP, PI3K activity, calcium and actin assays, siRNA knockdown","pmids":["20484116"],"confidence":"High","gaps":["Architecture of TREM2-DAP12-DAP10 complex not structurally defined"]},{"year":2011,"claim":"Defined post-transcriptional and transcriptional control: IL-2-induced glycosylation stabilizes the NKG2D-DAP10 complex while TGF-β1 represses the DAP10 promoter via reduced RNA Pol II loading.","evidence":"Metabolic labeling, glycosylation inhibitors, Co-IP, RNA Pol II ChIP, RT-PCR, flow cytometry; plus TGF-β1 treatment with antibody rescue","pmids":["21816829","22438812"],"confidence":"High","gaps":["Glycosylation sites on DAP10 not mapped","How TGF-β1 represses Pol II recruitment mechanistically unclear"]},{"year":2014,"claim":"Broadened the partner repertoire to RAGE in keratinocytes, where RAGE-DAP10 heterodimers switch S100A8/A9 signaling toward Akt survival over RAGE homomer-driven apoptosis.","evidence":"Co-IP, oligomerization constructs, Akt and caspase-8 assays, DAP10 blocking antibody, viability assays","pmids":["25002577"],"confidence":"Medium","gaps":["YINM-dependence of RAGE-DAP10 Akt signaling not tested","Single lab, non-immune cell context"]},{"year":2015,"claim":"Showed ubiquitylation of DAP10 drives endocytosis and degradation of NKG2D-DAP10 complexes and that this trafficking step is required for ERK activation and effector functions, coupling receptor internalization to signaling output.","evidence":"Ubiquitylation assays, endocytosis with ubiquitylation-deficient mutants, confocal microscopy, ERK and effector assays in human NK cells","pmids":["26508790"],"confidence":"High","gaps":["E3 ligase responsible for DAP10 ubiquitylation not identified"]},{"year":2019,"claim":"Identified EVL as an actin-regulatory effector recruited through the same DAP10 site as Grb2/Vav1, linking the adaptor to WASP/VASP-driven F-actin, adhesion, and synapse function.","evidence":"Co-IP, confocal microscopy, siRNA knockdown, actin polymerization, adhesion and cytotoxicity assays","pmids":["31235500"],"confidence":"High","gaps":["Whether EVL and Grb2/Vav1 compete or co-occupy the DAP10 site unresolved"]},{"year":2025,"claim":"Added a metabolic-epigenetic layer, where ACLY-generated cytosolic acetyl-CoA maintains histone acetylation at the DAP10/DAP12 loci to sustain expression, reversible by acetate supplementation.","evidence":"Inducible ACLY-KO mice, RNA-seq, immunoblot, histone-acetylation profiling, acetate rescue, NK functional assays (preprint)","pmids":["bio_10.1101_2025.03.05.639198"],"confidence":"Medium","gaps":["Preprint not yet peer-reviewed","Specific acetylated histone marks and regulatory regions not finely mapped"]},{"year":null,"claim":"The identity of the kinase phosphorylating the YINM motif and the E3 ligase mediating DAP10 ubiquitylation remain unresolved, as does the structural basis for simultaneous p85, Grb2-Vav1, and EVL engagement at a single docking site.","evidence":"Not established in the available corpus","pmids":[],"confidence":"Low","gaps":["No upstream kinase identified","No E3 ligase identified","No structural model of multi-effector occupancy"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,2,3,5]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,2,3,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,12]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[10]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,3,5,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,20]}],"complexes":["NKG2D-DAP10","MDL-1-DAP12/DAP10","TREM2-DAP12-DAP10","RAGE-DAP10"],"partners":["NKG2D","PIK3R1","GRB2","VAV1","MDL-1","TREM2","RAGE","EVL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBK5","full_name":"Hematopoietic cell signal transducer","aliases":["DNAX-activation protein 10","Membrane protein DAP10","Transmembrane adapter protein KAP10"],"length_aa":93,"mass_kda":9.5,"function":"Transmembrane adapter protein which associates with KLRK1 to form an activation receptor KLRK1-HCST in lymphoid and myeloid cells; this receptor plays a major role in triggering cytotoxicity against target cells expressing cell surface ligands such as MHC class I chain-related MICA and MICB, and UL16-binding proteins (ULBPs); these ligands are up-regulated by stress conditions and pathological state such as viral infection and tumor transformation. Functions as a docking site for PI3-kinase PIK3R1 and GRB2. Interaction of ULBPs with KLRK1-HCST triggers calcium mobilization and activation of the PIK3R1, MAP2K/ERK, and JAK2/STAT5 signaling pathways. Both PIK3R1 and GRB2 are required for full KLRK1-HCST-mediated activation and ultimate killing of target cells. In NK cells, KLRK1-HCST signaling directly induces cytotoxicity and enhances cytokine production initiated via DAP12/TYROBP-associated receptors. In T-cells, it provides primarily costimulation for TCR-induced signals. KLRK1-HCST receptor plays a role in immune surveillance against tumors and is required for cytolysis of tumors cells; indeed, melanoma cells that do not express KLRK1 ligands escape from immune surveillance mediated by NK cells","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q9UBK5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HCST","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HCST","total_profiled":1310},"omim":[{"mim_id":"616802","title":"T CELL-INTERACTING ACTIVATING RECEPTOR ON MYELOID CELLS 1; TARM1","url":"https://www.omim.org/entry/616802"},{"mim_id":"616560","title":"CD300H ANTIGEN; CD300H","url":"https://www.omim.org/entry/616560"},{"mim_id":"616301","title":"CD300 ANTIGEN-LIKE FAMILY, MEMBER D; CD300LD","url":"https://www.omim.org/entry/616301"},{"mim_id":"611817","title":"KILLER CELL LECTIN-LIKE RECEPTOR, SUBFAMILY K, MEMBER 1; KLRK1","url":"https://www.omim.org/entry/611817"},{"mim_id":"604089","title":"HEMATOPOIETIC CELL SIGNAL TRANSDUCER; HCST","url":"https://www.omim.org/entry/604089"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Golgi apparatus","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Uncertain"},{"location":"Plasma membrane","reliability":"Uncertain"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":239.0},{"tissue":"lymphoid tissue","ntpm":112.5}],"url":"https://www.proteinatlas.org/search/HCST"},"hgnc":{"alias_symbol":["DAP10","DKFZP586C1522","KAP10"],"prev_symbol":["PIK3AP"]},"alphafold":{"accession":"Q9UBK5","domains":[{"cath_id":"-","chopping":"3-71","consensus_level":"medium","plddt":68.7725,"start":3,"end":71}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBK5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBK5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBK5-F1-predicted_aligned_error_v6.png","plddt_mean":67.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HCST","jax_strain_url":"https://www.jax.org/strain/search?query=HCST"},"sequence":{"accession":"Q9UBK5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBK5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBK5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBK5"}},"corpus_meta":[{"pmid":"10426994","id":"PMC_10426994","title":"An activating 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immunoreceptor complex with NKG2D on NK and T cells, and the DAP10 cytoplasmic YINM (YxxM) motif recruits the p85 subunit of PI3-kinase, enabling NKG2D-dependent signal transduction in response to MICA.\",\n      \"method\": \"Biochemical co-immunoprecipitation, transfection assays, SH2 domain-binding assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP and functional binding assay, independently replicated across multiple subsequent labs\",\n      \"pmids\": [\"10426994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"KAP10 (DAP10/HCST) binds PI3-kinase upon phosphorylation of its cytoplasmic YINM motif, activating Akt, and also binds the adaptor protein Grb2; KAP10 is genetically encoded within ~100 bp of the DAP12 locus on chromosome 19.\",\n      \"method\": \"Molecular cloning, transfection, biochemical binding assays (PI3K and Grb2 co-precipitation), Akt activation assay\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical methods in one study, corroborated by independent labs\",\n      \"pmids\": [\"10528161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"DAP10 and DAP12 form distinct, specific receptor complexes in NK cells; the transmembrane regions of DAP10 and DAP12 are sufficient to confer specific association with their respective ligand-binding partners, and DAP10 signals via the PI3K (YxNM) pathway while DAP12 signals via Syk/ZAP70 through its ITAM motif.\",\n      \"method\": \"Transfectant cell lines, co-immunoprecipitation, mutant transmembrane domain constructs, cytotoxicity assays, cytokine production assays\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mutants, multiple functional readouts, replicated\",\n      \"pmids\": [\"11015446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The YINM motif in the DAP10 cytoplasmic tail couples NKG2D stimulation to downstream activation of PI3K, Vav1, Rho family GTPases, and PLC, leading to NK cell killing in a Syk-family kinase-independent manner.\",\n      \"method\": \"Biochemical signaling assays, dominant-negative constructs, NK cytotoxicity assays\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal signaling assays with defined motif, replicated by independent labs\",\n      \"pmids\": [\"12740575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Vav1 is specifically required for DAP10-mediated NK cell cytotoxicity, whereas Vav2 and Vav3 are required for FcRγ- and DAP12-mediated cytotoxicity; genetic epistasis using mice lacking one, two, or all three Vav proteins places Vav1 specifically downstream of DAP10.\",\n      \"method\": \"Genetic epistasis using Vav1/Vav2/Vav3 knockout mice, NK cytotoxicity assays\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple knockout combinations, clear functional readout\",\n      \"pmids\": [\"15365099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DAP10 recruits a Grb2-Vav1 intermediate complex as well as p85 PI3K; Grb2-Vav1 binding to DAP10 initiates tyrosine phosphorylation events, but full calcium release and cytotoxicity require both Grb2-Vav1 and p85 to bind DAP10 simultaneously.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, calcium flux assays, NK cytotoxicity assays, dominant-negative constructs\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, calcium, cytotoxicity), single lab with rigorous controls\",\n      \"pmids\": [\"16582911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Vav1 interacts with DAP10 YxNM motifs through Grb2 and is required for DAP10-induced NK cell cytoskeletal polarization (actin and microtubule networks), maturation of the cytolytic synapse, target cell lysis, and PI3K-dependent Akt signaling.\",\n      \"method\": \"Vav1/DAP12 double-knockout mice, co-immunoprecipitation, confocal microscopy of cytoskeletal polarization, cytotoxicity assays, Akt phosphorylation assay\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, Co-IP, microscopy, and signaling assays in one study\",\n      \"pmids\": [\"16887996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IL-21 down-regulates DAP10 (HCST) expression in human NK and CD8+ T cells by reducing DAP10 promoter activity, leading to decreased NKG2D surface expression and impaired NKG2D-mediated NK cell functions.\",\n      \"method\": \"DAP10 luciferase reporter assay, RT-PCR, flow cytometry, redirected lysis and degranulation assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus functional readouts, single lab\",\n      \"pmids\": [\"16424177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DAP10 associates with the receptor MDL-1 in osteoclasts; MDL-1 associates with both DAP12 and DAP10 to form trimolecular MDL-1–DAP12/DAP10 complexes, and DAP10-deficient mice develop osteopetrosis with reduced osteoclast numbers, demonstrating DAP10's role in osteoclastogenesis and bone remodeling.\",\n      \"method\": \"DAP10-deficient mouse model, co-immunoprecipitation, osteoclast differentiation assays, bone histology\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse phenotype plus reciprocal Co-IP identifying the receptor partner\",\n      \"pmids\": [\"19251634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Ly49H must associate with and signal via DAP10 (in addition to DAP12) for optimal NK cell function during mouse cytomegalovirus infection; DAP10-deficient Ly49H+ NK cells show impaired ERK1/2 activation, reduced IFN-γ production, and diminished MCMV control.\",\n      \"method\": \"DAP10-deficient mice, MCMV infection model, flow cytometry, ERK phosphorylation assay, IFN-γ production assay\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO in defined infection model with multiple signaling readouts\",\n      \"pmids\": [\"19332875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Upon NK cell activation by MICB-expressing target cells, the NKG2D/DAP10 complex undergoes lysosomal degradation; DAP10 traffics to secretory lysosomes and polarizes to the cytotoxic immune synapse, with ~50% of total NKG2D protein degraded coincident with synapse recruitment.\",\n      \"method\": \"Confocal microscopy, subcellular fractionation, flow cytometry, immunoblot in primary NK cells and NKL cell line\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by microscopy and fractionation, single lab, two orthogonal methods\",\n      \"pmids\": [\"19329438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DAP10 plays a key role in TREM2- and DAP12-dependent recruitment of PI3K to the signaling complex; SHIP1 inhibits TREM2/DAP12 signaling by binding DAP12 in an SH2 domain-dependent manner to prevent PI3K recruitment, while DAP10 enables PI3K activation downstream of TREM2-DAP12 in osteoclasts/macrophages.\",\n      \"method\": \"Co-immunoprecipitation, PI3K activity assay, calcium mobilization assay, actin reorganization assay, siRNA knockdown\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, calcium, actin), rigorous controls\",\n      \"pmids\": [\"20484116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-2 up-regulates DAP10 protein expression largely post-transcriptionally and induces DAP10 glycosylation, which is required for DAP10 association with NKG2D and stabilization of NKG2D surface expression; TGF-β1 has an opposite and dominant effect by inhibiting RNA polymerase II association with the DAP10 promoter, decreasing DAP10 mRNA and protein and consequently NKG2D.\",\n      \"method\": \"Metabolic labeling, glycosylation inhibitor treatment, co-immunoprecipitation, ChIP (RNA Pol II), RT-PCR, flow cytometry, immunoblot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including ChIP, glycosylation studies, and Co-IP in one study\",\n      \"pmids\": [\"21816829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DAP10 associates with RAGE in human keratinocytes; RAGE-DAP10 heterodimer formation markedly enhances Akt activation, whereas RAGE-RAGE homomultimers activate caspase-8/apoptosis; functional blocking of DAP10 abrogates S100A8/A9-stimulated Akt phosphorylation and increases apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, artificial oligomerization constructs, Akt phosphorylation assay, caspase-8 assay, DAP10 functional blocking antibody, cell viability assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional blocking with signaling readouts, single lab\",\n      \"pmids\": [\"25002577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Ligand-induced endocytosis of NKG2D-DAP10 complexes depends on ubiquitylation of DAP10 and is required for degradation of internalized complexes; this ubiquitin-dependent endocytosis is also required for ERK activation and NK cell effector functions (cytotoxic granule secretion and IFN-γ production).\",\n      \"method\": \"Biochemical ubiquitylation assays, endocytosis assays with ubiquitylation-deficient DAP10 mutants, confocal microscopy, ERK phosphorylation assay, degranulation and cytokine assays in human NK cells\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutagenesis of ubiquitylation sites combined with multiple functional readouts, orthogonal methods\",\n      \"pmids\": [\"26508790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NKG2D-DAP10 signaling recruits the actin regulatory protein EVL to the NK cell cytotoxic synapse via the DAP10 binding site previously implicated in Grb2/Vav1 recruitment; EVL interacts with WASP and VASP and is required for F-actin generation, integrin-mediated adhesion, and NK cell cytotoxicity.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy, siRNA knockdown, actin polymerization assays, adhesion and cytotoxicity assays\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, microscopy, KD with functional readouts) in one study\",\n      \"pmids\": [\"31235500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TGF-β1 down-regulates NKG2D and DAP10 expression on human NK cells, impairing NK cell cytotoxicity and IFN-γ production; anti-TGF-β1 antibodies restore NKG2D and DAP10 expression in vitro.\",\n      \"method\": \"In vitro treatment of primary NK cells with TGF-β1, flow cytometry, anti-TGF-β1 antibody rescue, cytotoxicity and IFN-γ assays\",\n      \"journal\": \"PLoS Pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — flow cytometry and functional assays with antibody rescue, single lab\",\n      \"pmids\": [\"22438812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SIRPβ1 can associate with DAP10 in RBL-2H3 transfectants; however, engagement of SIRPβ1:DAP10 complexes alone does not induce serotonin release or TNF secretion (negative finding), but does co-stimulate RBL-2H3 effector function when sub-optimal FcεRI signaling is present.\",\n      \"method\": \"Transfectant cell lines, co-immunoprecipitation, serotonin release assay, TNF secretion assay, co-stimulation assay\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and functional assays in transfected cell line, single lab\",\n      \"pmids\": [\"14635062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"DAP10 associates with Ly49H and Ly49D in primary NK cells in vivo, but this association has no significant impact on Ly49H-mediated control of murine cytomegalovirus infection under physiological conditions (DAP10's contribution to Ly49D/H function is minimal in vivo).\",\n      \"method\": \"DAP10-deficient mice, co-immunoprecipitation from primary NK cells, MCMV infection model, flow cytometry\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP from primary cells plus in vivo infection model, single lab\",\n      \"pmids\": [\"19247984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In rat and mouse (but not human), CD94 — rather than NKG2C/E — associates with DAP12 and DAP10 through a transmembrane lysine residue unique to rodent CD94, enabling NK cell activation; this differs from the human system where NKG2C bears the DAP12-interacting residue.\",\n      \"method\": \"Biochemical analysis (co-immunoprecipitation), flow cytometry, mutant NKG2C constructs, redirected lysis assays with transfected NK cells\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and mutagenesis with functional assay, single lab\",\n      \"pmids\": [\"22084441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DAP10-deficient mice become osteopetrotic with age, with reduced osteoclasts, demonstrating an essential role for DAP10 signaling in normal bone remodeling.\",\n      \"method\": \"DAP10-deficient mouse model, histological bone analysis, osteoclast counting\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO with defined skeletal phenotype; also corroborated by the same paper reporting MDL-1 as the partner receptor\",\n      \"pmids\": [\"19251634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DAP10 deficiency in mice leads to hyperactive NKT cell functions (increased cytokine production and cytotoxicity) and impaired CD4+CD25+ regulatory T cell activation, indicating that DAP10 signaling normally raises the activation threshold of autoreactive NKT cells and Tregs to maintain self-tolerance.\",\n      \"method\": \"DAP10-deficient mouse model, syngeneic tumor challenge, NKT cytotoxicity assays, Treg activation and cytokine assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with tumor model and multiple immune cell readouts, single lab\",\n      \"pmids\": [\"17785813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ACLY deficiency in NK cells specifically reduces DAP10 and DAP12 transcript and protein levels through altered histone acetylation at the DAP10/DAP12 loci (as shown by epigenetic profiling), impairing activating receptor function; acetate supplementation restores DAP10/12 expression and receptor function, establishing that ACLY-generated cytosolic acetyl-CoA epigenetically regulates DAP10 expression.\",\n      \"method\": \"Inducible genetic KO mouse model (ACLY), RNA-seq, immunoblot, histone acetylation ChIP/epigenetic profiling, acetate rescue experiments, NK cytotoxicity and cytokine assays\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with epigenetic profiling and rescue experiment, multiple methods, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.05.639198\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DAP10 (HCST/KAP10) is a transmembrane adaptor protein that forms activating immunoreceptor complexes (primarily with NKG2D, but also MDL-1, RAGE, and other receptors) in NK, T, and myeloid cells; upon receptor ligation, a tyrosine in its cytoplasmic YINM motif is phosphorylated, recruiting both the p85 subunit of PI3K and a Grb2–Vav1 intermediate, which together—but not individually—drive full PI3K/Akt activation, Vav1-dependent cytoskeletal polarization (actin and microtubules), cytotoxic synapse maturation, and target cell lysis in a Syk-independent manner; ligand-induced ubiquitylation of DAP10 additionally triggers endocytosis of NKG2D–DAP10 complexes that is required for ERK activation and effector cytokine secretion; DAP10 expression is post-transcriptionally up-regulated by γc cytokines via DAP10 glycosylation (which stabilizes the NKG2D–DAP10 complex at the surface) and is down-regulated at the transcriptional level by TGF-β1 and IL-21, and epigenetically by loss of ACLY-generated acetyl-CoA; in vivo, DAP10 is essential for osteoclastogenesis and bone remodeling (DAP10-KO mice are osteopetrotic), optimal antiviral NK responses, and setting activation thresholds for NKT cells and regulatory T cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HCST (DAP10/KAP10) is a transmembrane adaptor that nucleates activating immunoreceptor complexes in NK, T, and myeloid lineages, coupling surface receptors to PI3K/Akt and cytoskeletal effector pathways that drive cytotoxicity and bone remodeling [#0, #3, #8]. It partners chiefly with NKG2D but also assembles into complexes with MDL-1, RAGE, TREM2/DAP12, Ly49H, CD94, and SIRPβ1, with transmembrane-domain residues conferring receptor-pairing specificity [#0, #2, #8, #11, #13]. On receptor ligation, the cytoplasmic YINM (YxxM) motif is tyrosine-phosphorylated and simultaneously recruits the p85 subunit of PI3K and a Grb2–Vav1 intermediate; both arms must engage DAP10 together to deliver full calcium flux, Akt signaling, and target lysis, doing so independently of Syk-family kinases [#0, #1, #3, #5]. Vav1 acting through this site directs Rho-family GTPase activation, actin and microtubule polarization, and cytolytic synapse maturation, and recruits the actin regulator EVL (which engages WASP/VASP) to generate F-actin and integrin-mediated adhesion [#3, #4, #6, #15]. Ligand-induced ubiquitylation of DAP10 triggers endocytosis and lysosomal degradation of NKG2D–DAP10 complexes, a step required for ERK activation, granule secretion, and IFN-γ production [#10, #14]. DAP10 abundance is set post-transcriptionally by γc-cytokine-induced glycosylation that stabilizes surface NKG2D, and is transcriptionally repressed by TGF-β1 and IL-21 [#7, #12, #16]. In vivo, DAP10 is essential for osteoclastogenesis and bone remodeling, with DAP10-deficient mice becoming osteopetrotic, contributes to optimal antiviral NK responses, and raises the activation threshold of NKT and regulatory T cells to maintain self-tolerance [#8, #9, #20, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established DAP10 as the activating adaptor for NKG2D and identified the YxxM/YINM motif as the docking site that links receptor ligation to PI3K and Akt, defining the core signaling output of the complex.\",\n      \"evidence\": \"Co-immunoprecipitation, transfection, SH2-binding and Akt activation assays in NK/T cells responding to MICA\",\n      \"pmids\": [\"10426994\", \"10528161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which kinase phosphorylates the YINM motif\", \"Grb2 binding noted but its downstream role unestablished\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Distinguished DAP10 from the ITAM adaptor DAP12, showing transmembrane regions dictate receptor-pairing specificity and that DAP10 signals via PI3K rather than Syk/ZAP70.\",\n      \"evidence\": \"Transfectants with mutant transmembrane domains, reciprocal Co-IP, cytotoxicity and cytokine readouts\",\n      \"pmids\": [\"11015446\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of transmembrane assembly specificity not structurally defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Mapped the DAP10 YINM motif to a Syk-independent cascade through PI3K, Vav1, Rho GTPases, and PLC driving NK killing, separating adaptor classes by their effector logic.\",\n      \"evidence\": \"Biochemical signaling and dominant-negative constructs with NK cytotoxicity assays\",\n      \"pmids\": [\"12740575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single phosphomotif assembles multiple effectors was unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved Vav isoform specificity, placing Vav1 selectively downstream of DAP10 versus Vav2/Vav3 for FcRγ/DAP12, refining the cytoskeletal arm of the pathway.\",\n      \"evidence\": \"Genetic epistasis across Vav1/2/3 knockout mouse combinations with cytotoxicity assays\",\n      \"pmids\": [\"15365099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect Vav1 recruitment to DAP10 not yet defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed DAP10 recruits both a Grb2-Vav1 intermediate and p85 PI3K, and that both must bind simultaneously for full calcium release and cytotoxicity, explaining how one motif coordinates two effector arms.\",\n      \"evidence\": \"Co-IP, phosphorylation, calcium flux and cytotoxicity assays with dominant-negative constructs; Vav1/DAP12 double-KO mice plus confocal microscopy\",\n      \"pmids\": [\"16582911\", \"16887996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of simultaneous p85 and Grb2-Vav1 binding not structurally resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified IL-21 as a transcriptional repressor of DAP10 that lowers NKG2D surface expression and NK function, introducing cytokine control of the adaptor.\",\n      \"evidence\": \"DAP10 luciferase reporter, RT-PCR, flow cytometry, redirected lysis/degranulation in human NK and CD8 T cells\",\n      \"pmids\": [\"16424177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Promoter elements and transcription factors mediating repression not mapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed an in vivo regulatory role beyond cytotoxicity, with DAP10 raising the activation threshold of NKT and regulatory T cells to preserve self-tolerance.\",\n      \"evidence\": \"DAP10-deficient mice, syngeneic tumor challenge, NKT cytotoxicity and Treg activation assays\",\n      \"pmids\": [\"17785813\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor partner mediating NKT/Treg threshold-setting not identified\", \"Single lab, mouse only\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended DAP10 beyond lymphocytes by identifying MDL-1 as a myeloid partner and demonstrating an essential role in osteoclastogenesis, with DAP10-KO mice becoming osteopetrotic.\",\n      \"evidence\": \"DAP10-deficient mice, Co-IP, osteoclast differentiation assays, bone histology\",\n      \"pmids\": [\"19251634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling output of MDL-1-DAP10 in osteoclasts not fully dissected\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated DAP10's antiviral contribution, where Ly49H signaling via DAP10 supports ERK activation, IFN-γ, and MCMV control, though the magnitude of contribution was debated across studies.\",\n      \"evidence\": \"DAP10-deficient mice in MCMV model with ERK and IFN-γ readouts; reciprocal Co-IP from primary NK cells\",\n      \"pmids\": [\"19332875\", \"19247984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conflicting estimates of in vivo importance of Ly49H-DAP10 coupling\", \"Quantitative contribution relative to DAP12 unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linked complex fate to function by showing NKG2D-DAP10 traffics to secretory lysosomes and polarizes to the synapse while undergoing degradation, connecting receptor turnover to effector responses.\",\n      \"evidence\": \"Confocal microscopy, subcellular fractionation, immunoblot in primary NK cells and NKL line\",\n      \"pmids\": [\"19329438\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation machinery not identified\", \"Functional consequence of degradation not directly tested here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Positioned DAP10 as the PI3K-recruiting partner that complements TREM2/DAP12 signaling, opposed by SHIP1, integrating DAP10 into myeloid receptor circuits.\",\n      \"evidence\": \"Co-IP, PI3K activity, calcium and actin assays, siRNA knockdown\",\n      \"pmids\": [\"20484116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Architecture of TREM2-DAP12-DAP10 complex not structurally defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined post-transcriptional and transcriptional control: IL-2-induced glycosylation stabilizes the NKG2D-DAP10 complex while TGF-β1 represses the DAP10 promoter via reduced RNA Pol II loading.\",\n      \"evidence\": \"Metabolic labeling, glycosylation inhibitors, Co-IP, RNA Pol II ChIP, RT-PCR, flow cytometry; plus TGF-β1 treatment with antibody rescue\",\n      \"pmids\": [\"21816829\", \"22438812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glycosylation sites on DAP10 not mapped\", \"How TGF-β1 represses Pol II recruitment mechanistically unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Broadened the partner repertoire to RAGE in keratinocytes, where RAGE-DAP10 heterodimers switch S100A8/A9 signaling toward Akt survival over RAGE homomer-driven apoptosis.\",\n      \"evidence\": \"Co-IP, oligomerization constructs, Akt and caspase-8 assays, DAP10 blocking antibody, viability assays\",\n      \"pmids\": [\"25002577\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"YINM-dependence of RAGE-DAP10 Akt signaling not tested\", \"Single lab, non-immune cell context\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed ubiquitylation of DAP10 drives endocytosis and degradation of NKG2D-DAP10 complexes and that this trafficking step is required for ERK activation and effector functions, coupling receptor internalization to signaling output.\",\n      \"evidence\": \"Ubiquitylation assays, endocytosis with ubiquitylation-deficient mutants, confocal microscopy, ERK and effector assays in human NK cells\",\n      \"pmids\": [\"26508790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase responsible for DAP10 ubiquitylation not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified EVL as an actin-regulatory effector recruited through the same DAP10 site as Grb2/Vav1, linking the adaptor to WASP/VASP-driven F-actin, adhesion, and synapse function.\",\n      \"evidence\": \"Co-IP, confocal microscopy, siRNA knockdown, actin polymerization, adhesion and cytotoxicity assays\",\n      \"pmids\": [\"31235500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EVL and Grb2/Vav1 compete or co-occupy the DAP10 site unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Added a metabolic-epigenetic layer, where ACLY-generated cytosolic acetyl-CoA maintains histone acetylation at the DAP10/DAP12 loci to sustain expression, reversible by acetate supplementation.\",\n      \"evidence\": \"Inducible ACLY-KO mice, RNA-seq, immunoblot, histone-acetylation profiling, acetate rescue, NK functional assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.05.639198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint not yet peer-reviewed\", \"Specific acetylated histone marks and regulatory regions not finely mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the kinase phosphorylating the YINM motif and the E3 ligase mediating DAP10 ubiquitylation remain unresolved, as does the structural basis for simultaneous p85, Grb2-Vav1, and EVL engagement at a single docking site.\",\n      \"evidence\": \"Not established in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No upstream kinase identified\", \"No E3 ligase identified\", \"No structural model of multi-effector occupancy\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 2, 3, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 12]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 3, 5, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 20]}\n    ],\n    \"complexes\": [\n      \"NKG2D-DAP10\",\n      \"MDL-1-DAP12/DAP10\",\n      \"TREM2-DAP12-DAP10\",\n      \"RAGE-DAP10\"\n    ],\n    \"partners\": [\n      \"NKG2D\",\n      \"PIK3R1\",\n      \"GRB2\",\n      \"VAV1\",\n      \"MDL-1\",\n      \"TREM2\",\n      \"RAGE\",\n      \"EVL\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}