{"gene":"CLEC6A","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2000,"finding":"Dectin-2 (CLEC6A) was cloned as a type II transmembrane C-type lectin expressed in a dendritic cell-specific manner; genomic analysis revealed it is encoded by 6 exons, with two truncated isoforms (beta and gamma) produced by alternative splicing.","method":"Subtractive cDNA cloning, RT-PCR, immunoblotting, genomic analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular cloning and genomic characterization, single lab with multiple orthogonal methods","pmids":["10766825"],"is_preprint":false},{"year":2006,"finding":"Dectin-2 binds preferentially to hyphal (rather than yeast/conidial) components of Candida albicans and other fungi; it lacks an intracellular signaling motif and instead associates with the FcRγ chain, whose ligation leads to protein tyrosine phosphorylation, NF-κB activation, ligand internalization, and TNF-α/IL-1Ra secretion, all blocked by the Src kinase inhibitor PP2.","method":"Binding assays with soluble dectin-2 receptor, co-immunoprecipitation with FcRγ, NF-κB reporter assay, Src kinase inhibition, cytokine ELISA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, co-IP, pharmacological inhibition, multiple orthogonal methods; replicated in subsequent work","pmids":["17050534"],"is_preprint":false},{"year":2006,"finding":"The carbohydrate-recognition domain (CRD) of Dectin-2 is a C-type lectin that binds high-mannose structures (Man9GlcNAc2) in a cation-dependent manner, with selectivity for mannose/fucose-like sugars; binding to C. albicans and zymosan is abrogated by cation chelation and competed by yeast mannans.","method":"Competitive inhibition binding assays, glycan array analysis, live C. albicans binding assays with soluble CRD fusion protein","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical characterization with glycan array, replicated by subsequent structural studies","pmids":["16423983"],"is_preprint":false},{"year":2009,"finding":"Dectin-2 signals via Syk kinase and the adaptor CARD9, coupling to Syk indirectly through association with the FcRγ chain (unlike Dectin-1 which has an ITAM-like motif); this pathway is required for dendritic cell activation and Th17 responses to Candida albicans.","method":"Genetic knockout/blockade experiments, Syk kinase assays, CARD9 epistasis, T cell cytokine assays, fungal infection model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models, epistasis with FcRγ, Syk, and CARD9; replicated independently","pmids":["19703985"],"is_preprint":false},{"year":2009,"finding":"Dectin-2 mediates cysteinyl leukotriene (cys-LT) generation from dendritic cells in response to house dust mite and Aspergillus fumigatus glycans; this requires FcRγ chain and Syk kinase, and was confirmed by lentiviral knockdown of Dectin-2 in bone marrow-derived DCs.","method":"Lentiviral knockdown, FcRγ-/- BMDCs, Syk inhibitors, transfection of individual receptors in mast cells, cys-LT ELISA","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor knockdown, genetic knockout, pharmacological inhibition, receptor reconstitution; multiple orthogonal methods","pmids":["19124755"],"is_preprint":false},{"year":2010,"finding":"Dectin-2 recognizes fungal alpha-mannans and signals through FcRγ chain and a Syk-CARD9-NF-κB-dependent pathway (without MAP kinase involvement) to induce IL-1β and IL-23 secretion; this pathway is required for Th17 cell differentiation and host defense against C. albicans.","method":"Clec4n-/- mouse generation, cytokine ELISA, signaling pathway analysis, T helper differentiation assays, in vivo candidiasis model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO mouse, multiple cytokine assays, in vivo model; independently replicated","pmids":["20493731"],"is_preprint":false},{"year":2010,"finding":"Schistosoma mansoni soluble egg antigens bind the Dectin-2/FcRγ complex and activate the Syk kinase signaling pathway, inducing reactive oxygen species and potassium efflux, which activates the Nlrp3 inflammasome leading to IL-1β production.","method":"Dectin-2/FcRγ complex binding assays, Syk activation assays, ROS measurement, K+ efflux assay, Nlrp3/ASC KO mice, IL-1β ELISA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — receptor binding, downstream signaling assays, genetic KO validation; multiple orthogonal methods","pmids":["21059925"],"is_preprint":false},{"year":2010,"finding":"CARD9 is selectively involved in Dectin-2-induced NF-κB activation in response to C. albicans hyphae; it mediates IκBα kinase ubiquitination (while Syk regulates IκBα kinase phosphorylation), and promotes CARD9-Bcl10 association downstream of Dectin-2 but not Dectin-1.","method":"Dectin-2 siRNA knockdown, CARD9 overexpression/KD, IKK ubiquitination assays, IKK phosphorylation assays, NF-κB reporter, co-IP of CARD9-Bcl10","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mechanistic epistasis with biochemical assays for ubiquitination and phosphorylation, co-IP, single lab with multiple orthogonal methods","pmids":["20538615"],"is_preprint":false},{"year":2011,"finding":"Dectin-2 mediates Th2 immunity through Dectin-2-dependent cysteinyl leukotriene generation; this pathway requires LTC4 synthase and CysLT1R, establishing the Dectin-2–cys-LT–CysLT1R axis as critical for eosinophilic pulmonary inflammation and Th2 cytokine production.","method":"Lentiviral KD of Dectin-2, adoptive transfer of pulsed BMDCs, LTC4S-/- and CysLT1R-/- mice, cytokine ELISA, lung inflammation assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and knockdown, adoptive transfer, multiple receptor-deficient lines; independently replicated","pmids":["21357742"],"is_preprint":false},{"year":2011,"finding":"Dectin-2 activates the NF-κB subunit c-Rel selectively (rather than all NF-κB subunits) through the CARD9-Bcl10-Malt1 signaling module in human dendritic cells, driving Th17-polarizing cytokines IL-1β and IL-23p19; Malt1 inhibition abrogates this c-Rel activation.","method":"Malt1 inhibitor treatment, c-Rel activation assays, dectin-2 stimulation of human DCs, cytokine ELISA, NF-κB subunit analysis","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition of Malt1, NF-κB subunit specificity analysis, cytokine assays; single lab, multiple orthogonal methods","pmids":["21283787"],"is_preprint":false},{"year":2011,"finding":"PLCγ2 functions downstream of Dectin-2 in response to C. albicans hyphae; PLCγ2-deficient (but not PLCγ1-deficient) macrophages show defective NF-κB and MAPK activation, reduced ROS production, and impaired cytokine production; PLCγ2-/- mice are defective in clearing C. albicans in vivo.","method":"PLCγ2-/- and PLCγ1-/- macrophages, NF-κB/MAPK activation assays, ROS assay, cytokine ELISA, in vivo candidiasis model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO comparison, multiple signaling readouts, in vivo validation; single lab","pmids":["22041900"],"is_preprint":false},{"year":2013,"finding":"Dectin-3 (CLECSF8/MCL/Clec4d) constitutively forms heterodimers with Dectin-2; the Dectin-3/Dectin-2 heterodimer binds α-mannans on C. albicans hyphae more effectively than respective homodimers, leading to potent NF-κB activation and inflammatory responses.","method":"Dectin-3 genetic KO mice, heterodimerization analysis, α-mannan binding assays, NF-κB reporter, cytokine assays, in vivo candidiasis model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, direct binding comparison between homo- and heterodimers, NF-κB assays; multiple orthogonal methods","pmids":["23911656"],"is_preprint":false},{"year":2014,"finding":"Dectin-2 is a direct receptor for mannose-capped lipoarabinomannan (Man-LAM) of Mycobacterium tuberculosis; Man-LAM-induced cytokine production by BMDCs is completely abrogated in Clec4n-/- mice, and Dectin-2 mediates antigen-specific T cell responses and experimental autoimmune encephalomyelitis adjuvant activity through Man-LAM recognition.","method":"Clec4n-/- BMDC cytokine assays, direct binding experiments, antigen-specific T cell assays, EAE model in Clec4n-/- mice, in vivo mycobacterial infection","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, direct binding established, multiple in vivo models; multiple orthogonal methods","pmids":["25176311"],"is_preprint":false},{"year":2015,"finding":"Dectin-2 (but not Dectin-1) participates in Aspergillus fumigatus hyphal recognition by human plasmacytoid dendritic cells, acting in cooperation with the FcRγ chain to trigger signaling responses leading to TNF-α and IFN-α release, antifungal activity, and pDC extracellular trap (pET) formation containing DNA and citrullinated histone H3.","method":"Dectin-2 blockade in human pDCs, cytokine ELISA, confocal and electron microscopy of pET formation, microarray transcriptome analysis","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Moderate — receptor blockade, imaging of extracellular traps, transcriptomics; multiple orthogonal methods","pmids":["25659141"],"is_preprint":false},{"year":2017,"finding":"The crystal structure of the human Dectin-2 CRD in complex with Man9GlcNAc2 revealed a primary Ca2+-coordinated binding site for reducing-end mannose and an adjacent secondary site for terminal non-reducing mannose; this geometry accommodates Manα1-2Man in internal positions of mannans, explaining selectivity for fungal mannans, bacterial LPS, and lipoarabinomannans containing Manα1-2Man.","method":"X-ray crystallography of CRD-oligosaccharide complex, competition binding studies, glycan array analysis, mutagenesis of binding site residues","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with ligand, competition binding, glycan array, mutagenesis; multiple orthogonal methods in single study","pmids":["28652405"],"is_preprint":false},{"year":2016,"finding":"Dectin-2 functions in Kupffer cells (liver-resident macrophages) to mediate phagocytosis and clearance of cancer cells, suppressing liver metastasis; this phagocytic activity is selectively conferred on Kupffer cells (not bone marrow-derived or alveolar macrophages), and MCL (macrophage C-type lectin) also contributes to this function.","method":"Dectin-2-/- mouse liver metastasis model, phagocytosis assays in different macrophage populations, subcutaneous tumor and lung metastasis controls","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO, cell-type-specific phagocytosis assays, multiple metastasis models; single lab","pmids":["27872290"],"is_preprint":false},{"year":2016,"finding":"PI3Kδ acts as a common upstream requirement downstream of Syk in the Dectin-2 signaling pathway, regulating protein kinase Cδ activity and controlling Dectin-2-dependent generation of both cysteinyl leukotrienes and cytokines (IL-23, IL-6, TNF-α, IL-33) in dendritic cells.","method":"Pharmacological PI3Kδ inhibition, siRNA knockdown, Dectin-2 cross-linking, adoptive transfer model, in vivo PI3Kδ inhibitor administration","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic inhibition, epistasis placement of PI3Kδ downstream of Syk, multiple mediator readouts; single lab","pmids":["27194783"],"is_preprint":false},{"year":2016,"finding":"Dectin-2 recognizes mannosylated O-antigens of Gram-negative bacteria (Hafnia alvei, E. coli O9a); binding requires the carbohydrate-recognition domain of Dectin-2 (abrogated by CRD mutations and mannosidase treatment), and Dectin-2 cross-talk with TLR4 involves Syk activation and receptor juxtaposition to augment cytokine production.","method":"Cell-based reporter assay, mannosidase treatment, Dectin-2 CRD binding-site mutants, Syk activation assay, Dectin-2 KO BMDCs, cytokine ELISA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reporter assay, mutagenesis of binding domain, genetic KO validation, Syk activation; multiple orthogonal methods","pmids":["27358401"],"is_preprint":false},{"year":2017,"finding":"Dectin-2 recognizes an endogenous self-ligand: β-glucuronidase (Gusb) expressed on dendritic cells; binding requires mannose-binding motif in Dectin-2 and N-glycosylation sites in Gusb; overexpression of Gusb confers ability to stimulate Dectin-2 reporter cells.","method":"Dectin-2 reporter cell assay, mannose competition, Dectin-2 mannose-binding motif mutant, Gusb identification by pulldown, N-glycosylation site mutagenesis, Gusb overexpression","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay, mutational analysis of both receptor and ligand, single lab with multiple orthogonal methods","pmids":["28046067"],"is_preprint":false},{"year":2018,"finding":"ManLAM from M. tuberculosis is the sole ligand mediating bacilli recognition by Dectin-2; (α1→2)-linked mannoside caps are required for signaling; lipoglycans from other bacterial species bearing α1→2 mannosides are also Dectin-2 ligands; dimannoside caps and multivalent interactions are required for binding and signaling.","method":"Isogenic M. tuberculosis mutant strains, Dectin-2 reporter signaling assay, synthetic mannodendrimers and lipoglycan variants, competitive inhibition binding","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isogenic mutant panel, structure-activity relationship with synthetic compounds, reporter assay; single lab, multiple orthogonal methods","pmids":["30443026"],"is_preprint":false},{"year":2019,"finding":"Dectin-2 recognizes unopsonized C. albicans and mediates NADPH oxidase-independent NETosis in neutrophils through activation of the downstream Syk-Ca2+-PKCδ-PAD4 signaling pathway, which modulates nuclear translocation of neutrophil elastase and histone citrullination; dectin-2-mediated NET formation in vivo restrains C. albicans dissemination.","method":"Dectin-2-/- mice, PAD4 inhibitor (GSK484), Syk/Ca2+/PKCδ pathway inhibitors, confocal microscopy for NE nuclear translocation, citrullinated histone assay, in vivo peritonitis model with DNase treatment","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, pharmacological pathway dissection, in vivo model validation; multiple orthogonal methods","pmids":["31693704"],"is_preprint":false},{"year":2019,"finding":"Dectin-2 signaling in macrophages resident in the aortic root induces CCL2 production, recruiting CCR2+ inflammatory monocytes that differentiate into monocyte-derived DCs in the vessel wall; these DCs release IL-1β via a Dectin-2-Syk-NLRP3 inflammasome pathway, which then activates endothelial cells to express CXCL1/CCL2 and adhesion molecules, propagating vascular inflammation in a KD-like model.","method":"Dectin-2-/- mice in CAWS-vasculitis model, intravital imaging, CCL2/CCR2 pathway analysis, NLRP3 inflammasome activation assays, monocyte adoptive transfer, IL-1β blockade","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, mechanistic pathway dissection with multiple signaling steps validated, multiple orthogonal methods","pmids":["31169521"],"is_preprint":false},{"year":2017,"finding":"Dectin-2 promotes NLRP3 inflammasome activation as a primary receptor in dendritic cells responding to Histoplasma capsulatum; Dectin-2 and Dectin-1 trigger Syk-JNK to activate both signal 1 (pro-IL-1β synthesis) and signal 2 (caspase-1 activation); cathepsin B release (regulated by ERK/JNK downstream of these receptors) serves as signal 2.","method":"Receptor-deficient DCs from Clec4n-/-, Clec7a-/-, and double KO mice, reciprocal receptor blockade, caspase-1 activation assays, K+ efflux measurement, cathepsin B inhibition, JNK/ERK pathway analysis","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO lines, reciprocal blocking, mechanistic epistasis with multiple pathway readouts","pmids":["28671985"],"is_preprint":false},{"year":2023,"finding":"ERMAP on cancer cells interacts with galectin-9 on Kupffer cells, which forms a bridging complex with Dectin-2 on Kupffer cells to induce phagocytosis of cancer cells; this ERMAP-galectin-9-Dectin-2 axis functions as an 'eat me' signal controlling liver metastasis.","method":"In vivo genome-wide CRISPR-Cas9 KO screen, co-immunoprecipitation of ERMAP-galectin-9-Dectin-2 complex, glycosylation-dependent interaction assays, phagocytosis assays, liver metastasis mouse model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen discovery, co-IP of trimeric complex, functional phagocytosis validation, in vivo metastasis model; multiple orthogonal methods","pmids":["37813965"],"is_preprint":false},{"year":2023,"finding":"Dectin-2 is a receptor for Aspergillus fumigatus galactomannan; galactomannan binds Dectin-2 and induces Dectin-2-dependent signaling including Syk activation, gene transcription, and TNF-α production; Dectin-2 deficiency increases immune cell recruitment to lungs but is dispensable for survival in pulmonary aspergillosis.","method":"Fungal-like particles with purified galactomannan, Dectin-2 binding assay, Syk phosphorylation assay, NF-κB/gene transcription reporter, TNF-α ELISA, Dectin-2-/- mouse aspergillosis model","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding established with purified ligand, signaling pathway assays, genetic KO in vivo validation; multiple orthogonal methods","pmids":["36598192"],"is_preprint":false},{"year":2024,"finding":"Crystal structure and biochemical analysis revealed that Dectin-2 and BDCA-2 form dimers in which CRDs have only limited direct interaction but are stabilized by the neck region; the resulting orientation of sugar-binding sites in dimers favors crosslinking of multiple dimers by oligosaccharide ligands, causing FcRγ clustering to initiate signaling.","method":"X-ray crystallography of extended extracellular domain of Dectin-2, disulfide-bonded BDCA-2 variant analysis, transmembrane domain replacement with dimerization domains, sugar-binding site geometry analysis","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional validation of dimerization mechanism, single lab but multiple structural and biochemical approaches","pmids":["39361900"],"is_preprint":false},{"year":2025,"finding":"Dectin-2 promotes osteoclastogenesis via the Syk/NOX2/ROS/MAPK signaling axis; Dectin-2 knockdown inhibits RAW264.7 and BMDM differentiation into osteoclasts while overexpression enhances it; Dectin-2 KO mice show reduced osteoclast numbers and decreased alveolar bone resorption in periodontitis.","method":"siRNA knockdown, Dectin-2 overexpression, Syk/NOX2/ROS/MAPK pathway analysis, single-cell sequencing, Dectin-2 KO mouse periodontitis model, histology","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE functional assays, pathway inhibition, in vivo KO model; single lab","pmids":["39800085"],"is_preprint":false},{"year":2003,"finding":"Dectin-2 on antigen-presenting cells interacts with an unidentified ligand on regulatory T cells; a soluble Dectin-2 fusion protein (sDec2) that blocks this interaction prevents UV-induced tolerance and breaks established hapten-specific tolerance; sDec2-reactive T cells are the regulatory T cells responsible for UV-induced immunosuppression.","method":"Soluble fusion protein blockade, contact hypersensitivity model, FACS analysis of sDec2-binding T cells, adoptive transfer of tolerance","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional blockade and adoptive transfer, but endogenous T cell ligand not identified; replicated in multiple model contexts","pmids":["14500681"],"is_preprint":false},{"year":2021,"finding":"A human Dectin-2 homozygous deletion mutation (507 del C, frameshift N170I with early stop codon) results in weakly expressed protein that does not form cell-surface clusters and is functionally defective; patient PBMCs carrying this mutation fail to produce TNF-α and IL-6 in response to A. fumigatus.","method":"Genetic sequencing of patient DNA, flow cytometry for Dectin-2 surface expression/clustering, cytokine ELISA from patient PBMCs","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — natural human loss-of-function mutation with functional validation in patient cells; single patient case","pmids":["33733279"],"is_preprint":false},{"year":2022,"finding":"Human MCL and Mincle form a disulfide-linked heterodimer that associates with FcεRIγ, but human MCL does not form a heterodimer with Dectin-2 (in contrast to findings in mouse and rat), indicating species differences in CLR heterodimerization.","method":"Co-transfection experiments, flow cytometry, co-immunoprecipitation","journal":"Scandinavian journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and flow cytometry in transfection system, negative result for human MCL-Dectin-2 heterodimer is informative; single lab","pmids":["35194806"],"is_preprint":false},{"year":2024,"finding":"N-linked mannans (but not O-linked mannans) of C. albicans cell wall potentiate the induction of trained immunity (innate immune memory), and this process is mediated by Dectin-2; branching of N-linked mannan is essential for this effect.","method":"C. albicans mannosylation mutants, cytokine assays, T-cell cytokine readouts, trained immunity induction protocol with Dectin-2-dependent pathway analysis","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic mutant panel, Dectin-2-dependent pathway established; single lab","pmids":["38446996"],"is_preprint":false}],"current_model":"CLEC6A (Dectin-2) is a type II transmembrane C-type lectin receptor expressed on myeloid cells (dendritic cells, macrophages, Kupffer cells, neutrophils) that recognizes high-mannose structures including fungal α-mannans, bacterial lipoarabinomannans, and galactomannan by binding Manα1-2Man epitopes at a Ca2+-coordinated CRD; it lacks intrinsic signaling capacity and instead associates with the FcRγ chain to recruit Syk kinase, which activates PLCγ2, PI3Kδ/PKCδ, CARD9-Bcl10-Malt1, and selectively the NF-κB subunit c-Rel to drive production of IL-1β, IL-23, TNF-α, and cysteinyl leukotrienes, thereby promoting Th17 and Th2 adaptive immune responses, NLRP3 inflammasome activation, neutrophil extracellular trap formation, and phagocytosis; Dectin-2 can also form heterodimers with Dectin-3/MCL for enhanced α-mannan binding, participates in an ERMAP-galectin-9-Dectin-2 trimeric complex on Kupffer cells to phagocytose cancer cells, and drives osteoclastogenesis through a Syk/NOX2/ROS/MAPK axis."},"narrative":{"mechanistic_narrative":"CLEC6A (Dectin-2) is a myeloid C-type lectin pattern-recognition receptor that detects high-mannose glycan structures on fungi and other microbes to initiate innate and adaptive immune responses [PMID:16423983, PMID:20493731]. Its Ca2+-dependent carbohydrate-recognition domain binds Manα1-2Man epitopes via a primary site for reducing-end mannose and an adjacent secondary site for terminal mannose, a geometry that confers selectivity for fungal α-mannans, mycobacterial mannose-capped lipoarabinomannan, bacterial mannosylated O-antigens, and Aspergillus galactomannan [PMID:28652405, PMID:25176311, PMID:27358401, PMID:36598192]. Lacking an intracellular signaling motif, Dectin-2 associates with the FcRγ chain and signals through Syk kinase and the CARD9-Bcl10-Malt1 module, selectively activating the NF-κB subunit c-Rel together with PLCγ2 and PI3Kδ/PKCδ to drive IL-1β, IL-23, TNF-α, and cysteinyl leukotriene production [PMID:17050534, PMID:19703985, PMID:21283787, PMID:22041900, PMID:27194783]. Through these outputs Dectin-2 polarizes Th17 and Th2 responses, triggers NLRP3 inflammasome activation, and promotes NADPH-oxidase-independent NET formation, collectively mediating antifungal host defense against Candida albicans and other pathogens [PMID:20493731, PMID:21357742, PMID:31693704, PMID:28671985]. Receptor signaling is initiated by ligand-induced crosslinking of Dectin-2 dimers, whose CRDs are oriented by the neck region to favor clustering of FcRγ [PMID:39361900], and signaling avidity is enhanced by heterodimerization with Dectin-3/MCL for α-mannan recognition [PMID:23911656]. Beyond microbial sensing, Dectin-2 on Kupffer cells acts as a phagocytic 'eat me' receptor for cancer cells within an ERMAP-galectin-9-Dectin-2 bridging complex to suppress liver metastasis [PMID:27872290, PMID:37813965], and drives osteoclastogenesis through a Syk/NOX2/ROS/MAPK axis [PMID:39800085]. A homozygous human loss-of-function deletion abolishes surface clustering and cytokine responses to A. fumigatus, establishing the receptor's nonredundant role in human antifungal immunity [PMID:33733279].","teleology":[{"year":2000,"claim":"Establishing that Dectin-2 is a dendritic-cell-restricted type II transmembrane C-type lectin defined its lineage and structural class before any ligand or function was known.","evidence":"Subtractive cDNA cloning, RT-PCR, and genomic analysis identifying 6 exons and alternatively spliced isoforms","pmids":["10766825"],"confidence":"Medium","gaps":["No ligand identified","No signaling mechanism defined","Function of truncated isoforms unknown"]},{"year":2006,"claim":"Identifying that the CRD binds high-mannose structures in a cation-dependent manner and preferentially recognizes fungal hyphae, while the receptor itself recruits FcRγ for signaling, defined both the ligand class and the requirement for an adaptor chain.","evidence":"Glycan array and competitive binding with soluble CRD, co-IP with FcRγ, NF-κB reporter, Src inhibition, cytokine ELISA","pmids":["16423983","17050534"],"confidence":"High","gaps":["Downstream kinase identity not yet placed","Structural basis of mannose selectivity not resolved"]},{"year":2009,"claim":"Demonstrating that Dectin-2 couples through FcRγ to Syk and CARD9 to drive dendritic cell activation and Th17 responses, and to generate cysteinyl leukotrienes, established the core signaling axis and its adaptive immune output.","evidence":"Genetic knockout/blockade, Syk assays, CARD9 epistasis, lentiviral knockdown, FcRγ-/- BMDCs, T cell cytokine assays, fungal infection","pmids":["19703985","19124755"],"confidence":"High","gaps":["Selectivity among NF-κB subunits not yet defined","PLCγ2 and PI3K branch not yet placed"]},{"year":2010,"claim":"Mapping the Syk-CARD9-Bcl10-NF-κB pathway in a Clec4n-/- mouse and showing it drives IL-1β/IL-23 and Th17 differentiation, with extension to schistosome antigen-driven NLRP3 inflammasome activation, established Dectin-2 as a master integrator of innate-to-adaptive signaling.","evidence":"Clec4n-/- mice, cytokine ELISA, IKK ubiquitination/phosphorylation assays, CARD9-Bcl10 co-IP, ROS and K+ efflux measurement, Nlrp3/ASC KO mice","pmids":["20493731","20538615","21059925"],"confidence":"High","gaps":["Which NF-κB subunit is selectively engaged not resolved","Quantitative contribution of distinct ligands to inflammasome activation unclear"]},{"year":2011,"claim":"Resolving that Dectin-2 selectively activates the c-Rel NF-κB subunit via CARD9-Bcl10-Malt1, uses PLCγ2 (not PLCγ1), and engages a cys-LT-CysLT1R axis for Th2 immunity refined the signaling specificity underlying distinct T-helper outcomes.","evidence":"Malt1 inhibition, c-Rel activation assays, PLCγ2-/- vs PLCγ1-/- macrophages, LTC4S-/- and CysLT1R-/- mice, adoptive transfer, lung inflammation assays","pmids":["21283787","22041900","21357742"],"confidence":"High","gaps":["How a single receptor branches between Th17 and Th2 outputs not fully resolved","PI3Kδ/PKCδ node not yet placed"]},{"year":2013,"claim":"Demonstrating constitutive Dectin-3/Dectin-2 heterodimers that bind α-mannans more effectively than homodimers revealed combinatorial CLR assembly as a mechanism to tune ligand avidity and signaling strength.","evidence":"Dectin-3 KO mice, heterodimerization analysis, α-mannan binding comparison, NF-κB reporter, in vivo candidiasis","pmids":["23911656"],"confidence":"High","gaps":["Stoichiometry and structural arrangement of heterodimer not defined","Human relevance of heterodimer not addressed here"]},{"year":2014,"claim":"Establishing Dectin-2 as a direct receptor for mycobacterial mannose-capped lipoarabinomannan with adjuvant and EAE-driving activity extended its ligand repertoire beyond fungi to bacterial glycans and autoimmune contexts.","evidence":"Clec4n-/- BMDC cytokine assays, direct binding, antigen-specific T cell assays, EAE and mycobacterial infection models","pmids":["25176311"],"confidence":"High","gaps":["Structural basis of Man-LAM recognition not yet defined","Contribution to in vivo TB control not quantified"]},{"year":2016,"claim":"Placing PI3Kδ downstream of Syk to control PKCδ and both leukotriene and cytokine output, identifying mannosylated bacterial O-antigens and TLR4 cross-talk, and revealing a Kupffer-cell-restricted phagocytic anti-metastatic function broadened both the signaling map and the physiological roles of Dectin-2.","evidence":"PI3Kδ inhibition/knockdown with epistasis, reporter assays with O-antigen ligands and CRD mutants, Dectin-2-/- liver metastasis model, cell-type-specific phagocytosis assays","pmids":["27194783","27358401","27872290"],"confidence":"High","gaps":["Mechanism conferring phagocytic competence specifically on Kupffer cells unresolved","Cancer-cell ligand not yet identified"]},{"year":2017,"claim":"Solving the CRD-Man9GlcNAc2 crystal structure with primary and secondary Ca2+-coordinated mannose sites explained selectivity for Manα1-2Man-containing glycans, and identification of an endogenous β-glucuronidase self-ligand plus Histoplasma-driven NLRP3 activation expanded the receptor's recognition scope.","evidence":"X-ray crystallography with ligand, mutagenesis, glycan array; reporter assay with Gusb identification; receptor-deficient DCs with caspase-1/cathepsin B analysis","pmids":["28652405","28046067","28671985"],"confidence":"High","gaps":["Physiological role of self-ligand recognition unclear","Gusb interaction is single-lab Medium-confidence"]},{"year":2019,"claim":"Dissecting a Syk-Ca2+-PKCδ-PAD4 axis driving NADPH-oxidase-independent NETosis and a Dectin-2-Syk-NLRP3 pathway propagating vascular inflammation linked receptor signaling to specific effector programs in neutrophils and vessel-wall macrophages.","evidence":"Dectin-2-/- mice, PAD4/Syk/PKCδ inhibitors, NE translocation imaging, CAWS vasculitis model, intravital imaging, NLRP3 and CCL2/CCR2 analysis","pmids":["31693704","31169521"],"confidence":"High","gaps":["Trigger distinguishing NETosis versus cytokine output not defined","Human relevance of vasculitis mechanism not established"]},{"year":2023,"claim":"Identifying the ERMAP-galectin-9-Dectin-2 trimeric bridging complex as a glycosylation-dependent 'eat me' signal and confirming Dectin-2 as a galactomannan receptor defined a non-microbial phagocytic role and a new fungal ligand.","evidence":"Genome-wide CRISPR screen, co-IP of trimeric complex, glycosylation-dependent interaction and phagocytosis assays, liver metastasis model; galactomannan binding and signaling assays with Dectin-2-/- aspergillosis model","pmids":["37813965","36598192"],"confidence":"High","gaps":["Structural basis of the trimeric bridging complex not resolved","How galectin-9 bridges ERMAP to Dectin-2 mechanistically unclear"]},{"year":2024,"claim":"Crystal structures of the extended extracellular domain showed that neck-region-stabilized dimers orient sugar-binding sites for ligand-induced crosslinking and FcRγ clustering, providing the structural mechanism of signal initiation, while N-mannan-driven trained immunity revealed a memory function.","evidence":"X-ray crystallography of extended ectodomain, disulfide-variant and TM-replacement analyses, sugar-binding geometry; C. albicans mannosylation mutants and trained immunity protocols","pmids":["39361900","38446996"],"confidence":"High","gaps":["Threshold of clustering required for signaling not quantified","Epigenetic basis of Dectin-2-driven trained immunity not defined"]},{"year":2025,"claim":"Demonstrating Dectin-2-driven osteoclastogenesis via a Syk/NOX2/ROS/MAPK axis with reduced bone resorption in KO mice extended the receptor's role to non-immune bone remodeling and periodontitis.","evidence":"siRNA knockdown, overexpression, pathway inhibition, single-cell sequencing, Dectin-2 KO periodontitis model, histology","pmids":["39800085"],"confidence":"Medium","gaps":["Activating ligand in osteoclast context not identified","Single-lab finding without independent replication"]},{"year":null,"claim":"It remains unresolved how a single receptor selects between divergent effector outcomes (Th17 versus Th2, cytokine versus NETosis, microbial defense versus phagocytic clearance) and what governs human-specific differences in CLR heterodimerization.","evidence":"Not addressed by available timeline evidence","pmids":[],"confidence":"Low","gaps":["Determinants of branching among downstream effector programs unknown","Human MCL does not heterodimerize with Dectin-2, complicating cross-species extrapolation","Endogenous self-ligand physiology uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,12,17,24]},{"term_id":"GO:0060089","term_label":"molecular transducer 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\"finding\": \"Dectin-2 (CLEC6A) was cloned as a type II transmembrane C-type lectin expressed in a dendritic cell-specific manner; genomic analysis revealed it is encoded by 6 exons, with two truncated isoforms (beta and gamma) produced by alternative splicing.\",\n      \"method\": \"Subtractive cDNA cloning, RT-PCR, immunoblotting, genomic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular cloning and genomic characterization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10766825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dectin-2 binds preferentially to hyphal (rather than yeast/conidial) components of Candida albicans and other fungi; it lacks an intracellular signaling motif and instead associates with the FcRγ chain, whose ligation leads to protein tyrosine phosphorylation, NF-κB activation, ligand internalization, and TNF-α/IL-1Ra secretion, all blocked by the Src kinase inhibitor PP2.\",\n      \"method\": \"Binding assays with soluble dectin-2 receptor, co-immunoprecipitation with FcRγ, NF-κB reporter assay, Src kinase inhibition, cytokine ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays, co-IP, pharmacological inhibition, multiple orthogonal methods; replicated in subsequent work\",\n      \"pmids\": [\"17050534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The carbohydrate-recognition domain (CRD) of Dectin-2 is a C-type lectin that binds high-mannose structures (Man9GlcNAc2) in a cation-dependent manner, with selectivity for mannose/fucose-like sugars; binding to C. albicans and zymosan is abrogated by cation chelation and competed by yeast mannans.\",\n      \"method\": \"Competitive inhibition binding assays, glycan array analysis, live C. albicans binding assays with soluble CRD fusion protein\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical characterization with glycan array, replicated by subsequent structural studies\",\n      \"pmids\": [\"16423983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Dectin-2 signals via Syk kinase and the adaptor CARD9, coupling to Syk indirectly through association with the FcRγ chain (unlike Dectin-1 which has an ITAM-like motif); this pathway is required for dendritic cell activation and Th17 responses to Candida albicans.\",\n      \"method\": \"Genetic knockout/blockade experiments, Syk kinase assays, CARD9 epistasis, T cell cytokine assays, fungal infection model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models, epistasis with FcRγ, Syk, and CARD9; replicated independently\",\n      \"pmids\": [\"19703985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Dectin-2 mediates cysteinyl leukotriene (cys-LT) generation from dendritic cells in response to house dust mite and Aspergillus fumigatus glycans; this requires FcRγ chain and Syk kinase, and was confirmed by lentiviral knockdown of Dectin-2 in bone marrow-derived DCs.\",\n      \"method\": \"Lentiviral knockdown, FcRγ-/- BMDCs, Syk inhibitors, transfection of individual receptors in mast cells, cys-LT ELISA\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor knockdown, genetic knockout, pharmacological inhibition, receptor reconstitution; multiple orthogonal methods\",\n      \"pmids\": [\"19124755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Dectin-2 recognizes fungal alpha-mannans and signals through FcRγ chain and a Syk-CARD9-NF-κB-dependent pathway (without MAP kinase involvement) to induce IL-1β and IL-23 secretion; this pathway is required for Th17 cell differentiation and host defense against C. albicans.\",\n      \"method\": \"Clec4n-/- mouse generation, cytokine ELISA, signaling pathway analysis, T helper differentiation assays, in vivo candidiasis model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO mouse, multiple cytokine assays, in vivo model; independently replicated\",\n      \"pmids\": [\"20493731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Schistosoma mansoni soluble egg antigens bind the Dectin-2/FcRγ complex and activate the Syk kinase signaling pathway, inducing reactive oxygen species and potassium efflux, which activates the Nlrp3 inflammasome leading to IL-1β production.\",\n      \"method\": \"Dectin-2/FcRγ complex binding assays, Syk activation assays, ROS measurement, K+ efflux assay, Nlrp3/ASC KO mice, IL-1β ELISA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — receptor binding, downstream signaling assays, genetic KO validation; multiple orthogonal methods\",\n      \"pmids\": [\"21059925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CARD9 is selectively involved in Dectin-2-induced NF-κB activation in response to C. albicans hyphae; it mediates IκBα kinase ubiquitination (while Syk regulates IκBα kinase phosphorylation), and promotes CARD9-Bcl10 association downstream of Dectin-2 but not Dectin-1.\",\n      \"method\": \"Dectin-2 siRNA knockdown, CARD9 overexpression/KD, IKK ubiquitination assays, IKK phosphorylation assays, NF-κB reporter, co-IP of CARD9-Bcl10\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mechanistic epistasis with biochemical assays for ubiquitination and phosphorylation, co-IP, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20538615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dectin-2 mediates Th2 immunity through Dectin-2-dependent cysteinyl leukotriene generation; this pathway requires LTC4 synthase and CysLT1R, establishing the Dectin-2–cys-LT–CysLT1R axis as critical for eosinophilic pulmonary inflammation and Th2 cytokine production.\",\n      \"method\": \"Lentiviral KD of Dectin-2, adoptive transfer of pulsed BMDCs, LTC4S-/- and CysLT1R-/- mice, cytokine ELISA, lung inflammation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and knockdown, adoptive transfer, multiple receptor-deficient lines; independently replicated\",\n      \"pmids\": [\"21357742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dectin-2 activates the NF-κB subunit c-Rel selectively (rather than all NF-κB subunits) through the CARD9-Bcl10-Malt1 signaling module in human dendritic cells, driving Th17-polarizing cytokines IL-1β and IL-23p19; Malt1 inhibition abrogates this c-Rel activation.\",\n      \"method\": \"Malt1 inhibitor treatment, c-Rel activation assays, dectin-2 stimulation of human DCs, cytokine ELISA, NF-κB subunit analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition of Malt1, NF-κB subunit specificity analysis, cytokine assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21283787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PLCγ2 functions downstream of Dectin-2 in response to C. albicans hyphae; PLCγ2-deficient (but not PLCγ1-deficient) macrophages show defective NF-κB and MAPK activation, reduced ROS production, and impaired cytokine production; PLCγ2-/- mice are defective in clearing C. albicans in vivo.\",\n      \"method\": \"PLCγ2-/- and PLCγ1-/- macrophages, NF-κB/MAPK activation assays, ROS assay, cytokine ELISA, in vivo candidiasis model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO comparison, multiple signaling readouts, in vivo validation; single lab\",\n      \"pmids\": [\"22041900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dectin-3 (CLECSF8/MCL/Clec4d) constitutively forms heterodimers with Dectin-2; the Dectin-3/Dectin-2 heterodimer binds α-mannans on C. albicans hyphae more effectively than respective homodimers, leading to potent NF-κB activation and inflammatory responses.\",\n      \"method\": \"Dectin-3 genetic KO mice, heterodimerization analysis, α-mannan binding assays, NF-κB reporter, cytokine assays, in vivo candidiasis model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, direct binding comparison between homo- and heterodimers, NF-κB assays; multiple orthogonal methods\",\n      \"pmids\": [\"23911656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dectin-2 is a direct receptor for mannose-capped lipoarabinomannan (Man-LAM) of Mycobacterium tuberculosis; Man-LAM-induced cytokine production by BMDCs is completely abrogated in Clec4n-/- mice, and Dectin-2 mediates antigen-specific T cell responses and experimental autoimmune encephalomyelitis adjuvant activity through Man-LAM recognition.\",\n      \"method\": \"Clec4n-/- BMDC cytokine assays, direct binding experiments, antigen-specific T cell assays, EAE model in Clec4n-/- mice, in vivo mycobacterial infection\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, direct binding established, multiple in vivo models; multiple orthogonal methods\",\n      \"pmids\": [\"25176311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dectin-2 (but not Dectin-1) participates in Aspergillus fumigatus hyphal recognition by human plasmacytoid dendritic cells, acting in cooperation with the FcRγ chain to trigger signaling responses leading to TNF-α and IFN-α release, antifungal activity, and pDC extracellular trap (pET) formation containing DNA and citrullinated histone H3.\",\n      \"method\": \"Dectin-2 blockade in human pDCs, cytokine ELISA, confocal and electron microscopy of pET formation, microarray transcriptome analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — receptor blockade, imaging of extracellular traps, transcriptomics; multiple orthogonal methods\",\n      \"pmids\": [\"25659141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The crystal structure of the human Dectin-2 CRD in complex with Man9GlcNAc2 revealed a primary Ca2+-coordinated binding site for reducing-end mannose and an adjacent secondary site for terminal non-reducing mannose; this geometry accommodates Manα1-2Man in internal positions of mannans, explaining selectivity for fungal mannans, bacterial LPS, and lipoarabinomannans containing Manα1-2Man.\",\n      \"method\": \"X-ray crystallography of CRD-oligosaccharide complex, competition binding studies, glycan array analysis, mutagenesis of binding site residues\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with ligand, competition binding, glycan array, mutagenesis; multiple orthogonal methods in single study\",\n      \"pmids\": [\"28652405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dectin-2 functions in Kupffer cells (liver-resident macrophages) to mediate phagocytosis and clearance of cancer cells, suppressing liver metastasis; this phagocytic activity is selectively conferred on Kupffer cells (not bone marrow-derived or alveolar macrophages), and MCL (macrophage C-type lectin) also contributes to this function.\",\n      \"method\": \"Dectin-2-/- mouse liver metastasis model, phagocytosis assays in different macrophage populations, subcutaneous tumor and lung metastasis controls\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO, cell-type-specific phagocytosis assays, multiple metastasis models; single lab\",\n      \"pmids\": [\"27872290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PI3Kδ acts as a common upstream requirement downstream of Syk in the Dectin-2 signaling pathway, regulating protein kinase Cδ activity and controlling Dectin-2-dependent generation of both cysteinyl leukotrienes and cytokines (IL-23, IL-6, TNF-α, IL-33) in dendritic cells.\",\n      \"method\": \"Pharmacological PI3Kδ inhibition, siRNA knockdown, Dectin-2 cross-linking, adoptive transfer model, in vivo PI3Kδ inhibitor administration\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic inhibition, epistasis placement of PI3Kδ downstream of Syk, multiple mediator readouts; single lab\",\n      \"pmids\": [\"27194783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dectin-2 recognizes mannosylated O-antigens of Gram-negative bacteria (Hafnia alvei, E. coli O9a); binding requires the carbohydrate-recognition domain of Dectin-2 (abrogated by CRD mutations and mannosidase treatment), and Dectin-2 cross-talk with TLR4 involves Syk activation and receptor juxtaposition to augment cytokine production.\",\n      \"method\": \"Cell-based reporter assay, mannosidase treatment, Dectin-2 CRD binding-site mutants, Syk activation assay, Dectin-2 KO BMDCs, cytokine ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay, mutagenesis of binding domain, genetic KO validation, Syk activation; multiple orthogonal methods\",\n      \"pmids\": [\"27358401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Dectin-2 recognizes an endogenous self-ligand: β-glucuronidase (Gusb) expressed on dendritic cells; binding requires mannose-binding motif in Dectin-2 and N-glycosylation sites in Gusb; overexpression of Gusb confers ability to stimulate Dectin-2 reporter cells.\",\n      \"method\": \"Dectin-2 reporter cell assay, mannose competition, Dectin-2 mannose-binding motif mutant, Gusb identification by pulldown, N-glycosylation site mutagenesis, Gusb overexpression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay, mutational analysis of both receptor and ligand, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28046067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ManLAM from M. tuberculosis is the sole ligand mediating bacilli recognition by Dectin-2; (α1→2)-linked mannoside caps are required for signaling; lipoglycans from other bacterial species bearing α1→2 mannosides are also Dectin-2 ligands; dimannoside caps and multivalent interactions are required for binding and signaling.\",\n      \"method\": \"Isogenic M. tuberculosis mutant strains, Dectin-2 reporter signaling assay, synthetic mannodendrimers and lipoglycan variants, competitive inhibition binding\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic mutant panel, structure-activity relationship with synthetic compounds, reporter assay; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30443026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dectin-2 recognizes unopsonized C. albicans and mediates NADPH oxidase-independent NETosis in neutrophils through activation of the downstream Syk-Ca2+-PKCδ-PAD4 signaling pathway, which modulates nuclear translocation of neutrophil elastase and histone citrullination; dectin-2-mediated NET formation in vivo restrains C. albicans dissemination.\",\n      \"method\": \"Dectin-2-/- mice, PAD4 inhibitor (GSK484), Syk/Ca2+/PKCδ pathway inhibitors, confocal microscopy for NE nuclear translocation, citrullinated histone assay, in vivo peritonitis model with DNase treatment\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, pharmacological pathway dissection, in vivo model validation; multiple orthogonal methods\",\n      \"pmids\": [\"31693704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dectin-2 signaling in macrophages resident in the aortic root induces CCL2 production, recruiting CCR2+ inflammatory monocytes that differentiate into monocyte-derived DCs in the vessel wall; these DCs release IL-1β via a Dectin-2-Syk-NLRP3 inflammasome pathway, which then activates endothelial cells to express CXCL1/CCL2 and adhesion molecules, propagating vascular inflammation in a KD-like model.\",\n      \"method\": \"Dectin-2-/- mice in CAWS-vasculitis model, intravital imaging, CCL2/CCR2 pathway analysis, NLRP3 inflammasome activation assays, monocyte adoptive transfer, IL-1β blockade\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, mechanistic pathway dissection with multiple signaling steps validated, multiple orthogonal methods\",\n      \"pmids\": [\"31169521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Dectin-2 promotes NLRP3 inflammasome activation as a primary receptor in dendritic cells responding to Histoplasma capsulatum; Dectin-2 and Dectin-1 trigger Syk-JNK to activate both signal 1 (pro-IL-1β synthesis) and signal 2 (caspase-1 activation); cathepsin B release (regulated by ERK/JNK downstream of these receptors) serves as signal 2.\",\n      \"method\": \"Receptor-deficient DCs from Clec4n-/-, Clec7a-/-, and double KO mice, reciprocal receptor blockade, caspase-1 activation assays, K+ efflux measurement, cathepsin B inhibition, JNK/ERK pathway analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO lines, reciprocal blocking, mechanistic epistasis with multiple pathway readouts\",\n      \"pmids\": [\"28671985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ERMAP on cancer cells interacts with galectin-9 on Kupffer cells, which forms a bridging complex with Dectin-2 on Kupffer cells to induce phagocytosis of cancer cells; this ERMAP-galectin-9-Dectin-2 axis functions as an 'eat me' signal controlling liver metastasis.\",\n      \"method\": \"In vivo genome-wide CRISPR-Cas9 KO screen, co-immunoprecipitation of ERMAP-galectin-9-Dectin-2 complex, glycosylation-dependent interaction assays, phagocytosis assays, liver metastasis mouse model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen discovery, co-IP of trimeric complex, functional phagocytosis validation, in vivo metastasis model; multiple orthogonal methods\",\n      \"pmids\": [\"37813965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Dectin-2 is a receptor for Aspergillus fumigatus galactomannan; galactomannan binds Dectin-2 and induces Dectin-2-dependent signaling including Syk activation, gene transcription, and TNF-α production; Dectin-2 deficiency increases immune cell recruitment to lungs but is dispensable for survival in pulmonary aspergillosis.\",\n      \"method\": \"Fungal-like particles with purified galactomannan, Dectin-2 binding assay, Syk phosphorylation assay, NF-κB/gene transcription reporter, TNF-α ELISA, Dectin-2-/- mouse aspergillosis model\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding established with purified ligand, signaling pathway assays, genetic KO in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"36598192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structure and biochemical analysis revealed that Dectin-2 and BDCA-2 form dimers in which CRDs have only limited direct interaction but are stabilized by the neck region; the resulting orientation of sugar-binding sites in dimers favors crosslinking of multiple dimers by oligosaccharide ligands, causing FcRγ clustering to initiate signaling.\",\n      \"method\": \"X-ray crystallography of extended extracellular domain of Dectin-2, disulfide-bonded BDCA-2 variant analysis, transmembrane domain replacement with dimerization domains, sugar-binding site geometry analysis\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional validation of dimerization mechanism, single lab but multiple structural and biochemical approaches\",\n      \"pmids\": [\"39361900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Dectin-2 promotes osteoclastogenesis via the Syk/NOX2/ROS/MAPK signaling axis; Dectin-2 knockdown inhibits RAW264.7 and BMDM differentiation into osteoclasts while overexpression enhances it; Dectin-2 KO mice show reduced osteoclast numbers and decreased alveolar bone resorption in periodontitis.\",\n      \"method\": \"siRNA knockdown, Dectin-2 overexpression, Syk/NOX2/ROS/MAPK pathway analysis, single-cell sequencing, Dectin-2 KO mouse periodontitis model, histology\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE functional assays, pathway inhibition, in vivo KO model; single lab\",\n      \"pmids\": [\"39800085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Dectin-2 on antigen-presenting cells interacts with an unidentified ligand on regulatory T cells; a soluble Dectin-2 fusion protein (sDec2) that blocks this interaction prevents UV-induced tolerance and breaks established hapten-specific tolerance; sDec2-reactive T cells are the regulatory T cells responsible for UV-induced immunosuppression.\",\n      \"method\": \"Soluble fusion protein blockade, contact hypersensitivity model, FACS analysis of sDec2-binding T cells, adoptive transfer of tolerance\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional blockade and adoptive transfer, but endogenous T cell ligand not identified; replicated in multiple model contexts\",\n      \"pmids\": [\"14500681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A human Dectin-2 homozygous deletion mutation (507 del C, frameshift N170I with early stop codon) results in weakly expressed protein that does not form cell-surface clusters and is functionally defective; patient PBMCs carrying this mutation fail to produce TNF-α and IL-6 in response to A. fumigatus.\",\n      \"method\": \"Genetic sequencing of patient DNA, flow cytometry for Dectin-2 surface expression/clustering, cytokine ELISA from patient PBMCs\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — natural human loss-of-function mutation with functional validation in patient cells; single patient case\",\n      \"pmids\": [\"33733279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human MCL and Mincle form a disulfide-linked heterodimer that associates with FcεRIγ, but human MCL does not form a heterodimer with Dectin-2 (in contrast to findings in mouse and rat), indicating species differences in CLR heterodimerization.\",\n      \"method\": \"Co-transfection experiments, flow cytometry, co-immunoprecipitation\",\n      \"journal\": \"Scandinavian journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and flow cytometry in transfection system, negative result for human MCL-Dectin-2 heterodimer is informative; single lab\",\n      \"pmids\": [\"35194806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"N-linked mannans (but not O-linked mannans) of C. albicans cell wall potentiate the induction of trained immunity (innate immune memory), and this process is mediated by Dectin-2; branching of N-linked mannan is essential for this effect.\",\n      \"method\": \"C. albicans mannosylation mutants, cytokine assays, T-cell cytokine readouts, trained immunity induction protocol with Dectin-2-dependent pathway analysis\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic mutant panel, Dectin-2-dependent pathway established; single lab\",\n      \"pmids\": [\"38446996\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLEC6A (Dectin-2) is a type II transmembrane C-type lectin receptor expressed on myeloid cells (dendritic cells, macrophages, Kupffer cells, neutrophils) that recognizes high-mannose structures including fungal α-mannans, bacterial lipoarabinomannans, and galactomannan by binding Manα1-2Man epitopes at a Ca2+-coordinated CRD; it lacks intrinsic signaling capacity and instead associates with the FcRγ chain to recruit Syk kinase, which activates PLCγ2, PI3Kδ/PKCδ, CARD9-Bcl10-Malt1, and selectively the NF-κB subunit c-Rel to drive production of IL-1β, IL-23, TNF-α, and cysteinyl leukotrienes, thereby promoting Th17 and Th2 adaptive immune responses, NLRP3 inflammasome activation, neutrophil extracellular trap formation, and phagocytosis; Dectin-2 can also form heterodimers with Dectin-3/MCL for enhanced α-mannan binding, participates in an ERMAP-galectin-9-Dectin-2 trimeric complex on Kupffer cells to phagocytose cancer cells, and drives osteoclastogenesis through a Syk/NOX2/ROS/MAPK axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CLEC6A (Dectin-2) is a myeloid C-type lectin pattern-recognition receptor that detects high-mannose glycan structures on fungi and other microbes to initiate innate and adaptive immune responses [#2, #5]. Its Ca2+-dependent carbohydrate-recognition domain binds Manα1-2Man epitopes via a primary site for reducing-end mannose and an adjacent secondary site for terminal mannose, a geometry that confers selectivity for fungal α-mannans, mycobacterial mannose-capped lipoarabinomannan, bacterial mannosylated O-antigens, and Aspergillus galactomannan [#14, #12, #17, #24]. Lacking an intracellular signaling motif, Dectin-2 associates with the FcRγ chain and signals through Syk kinase and the CARD9-Bcl10-Malt1 module, selectively activating the NF-κB subunit c-Rel together with PLCγ2 and PI3Kδ/PKCδ to drive IL-1β, IL-23, TNF-α, and cysteinyl leukotriene production [#1, #3, #9, #10, #16]. Through these outputs Dectin-2 polarizes Th17 and Th2 responses, triggers NLRP3 inflammasome activation, and promotes NADPH-oxidase-independent NET formation, collectively mediating antifungal host defense against Candida albicans and other pathogens [#5, #8, #20, #22]. Receptor signaling is initiated by ligand-induced crosslinking of Dectin-2 dimers, whose CRDs are oriented by the neck region to favor clustering of FcRγ [#25], and signaling avidity is enhanced by heterodimerization with Dectin-3/MCL for α-mannan recognition [#11]. Beyond microbial sensing, Dectin-2 on Kupffer cells acts as a phagocytic 'eat me' receptor for cancer cells within an ERMAP-galectin-9-Dectin-2 bridging complex to suppress liver metastasis [#15, #23], and drives osteoclastogenesis through a Syk/NOX2/ROS/MAPK axis [#26]. A homozygous human loss-of-function deletion abolishes surface clustering and cytokine responses to A. fumigatus, establishing the receptor's nonredundant role in human antifungal immunity [#28].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing that Dectin-2 is a dendritic-cell-restricted type II transmembrane C-type lectin defined its lineage and structural class before any ligand or function was known.\",\n      \"evidence\": \"Subtractive cDNA cloning, RT-PCR, and genomic analysis identifying 6 exons and alternatively spliced isoforms\",\n      \"pmids\": [\"10766825\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No ligand identified\", \"No signaling mechanism defined\", \"Function of truncated isoforms unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying that the CRD binds high-mannose structures in a cation-dependent manner and preferentially recognizes fungal hyphae, while the receptor itself recruits FcRγ for signaling, defined both the ligand class and the requirement for an adaptor chain.\",\n      \"evidence\": \"Glycan array and competitive binding with soluble CRD, co-IP with FcRγ, NF-κB reporter, Src inhibition, cytokine ELISA\",\n      \"pmids\": [\"16423983\", \"17050534\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream kinase identity not yet placed\", \"Structural basis of mannose selectivity not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that Dectin-2 couples through FcRγ to Syk and CARD9 to drive dendritic cell activation and Th17 responses, and to generate cysteinyl leukotrienes, established the core signaling axis and its adaptive immune output.\",\n      \"evidence\": \"Genetic knockout/blockade, Syk assays, CARD9 epistasis, lentiviral knockdown, FcRγ-/- BMDCs, T cell cytokine assays, fungal infection\",\n      \"pmids\": [\"19703985\", \"19124755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity among NF-κB subunits not yet defined\", \"PLCγ2 and PI3K branch not yet placed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapping the Syk-CARD9-Bcl10-NF-κB pathway in a Clec4n-/- mouse and showing it drives IL-1β/IL-23 and Th17 differentiation, with extension to schistosome antigen-driven NLRP3 inflammasome activation, established Dectin-2 as a master integrator of innate-to-adaptive signaling.\",\n      \"evidence\": \"Clec4n-/- mice, cytokine ELISA, IKK ubiquitination/phosphorylation assays, CARD9-Bcl10 co-IP, ROS and K+ efflux measurement, Nlrp3/ASC KO mice\",\n      \"pmids\": [\"20493731\", \"20538615\", \"21059925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which NF-κB subunit is selectively engaged not resolved\", \"Quantitative contribution of distinct ligands to inflammasome activation unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolving that Dectin-2 selectively activates the c-Rel NF-κB subunit via CARD9-Bcl10-Malt1, uses PLCγ2 (not PLCγ1), and engages a cys-LT-CysLT1R axis for Th2 immunity refined the signaling specificity underlying distinct T-helper outcomes.\",\n      \"evidence\": \"Malt1 inhibition, c-Rel activation assays, PLCγ2-/- vs PLCγ1-/- macrophages, LTC4S-/- and CysLT1R-/- mice, adoptive transfer, lung inflammation assays\",\n      \"pmids\": [\"21283787\", \"22041900\", \"21357742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single receptor branches between Th17 and Th2 outputs not fully resolved\", \"PI3Kδ/PKCδ node not yet placed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating constitutive Dectin-3/Dectin-2 heterodimers that bind α-mannans more effectively than homodimers revealed combinatorial CLR assembly as a mechanism to tune ligand avidity and signaling strength.\",\n      \"evidence\": \"Dectin-3 KO mice, heterodimerization analysis, α-mannan binding comparison, NF-κB reporter, in vivo candidiasis\",\n      \"pmids\": [\"23911656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural arrangement of heterodimer not defined\", \"Human relevance of heterodimer not addressed here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Establishing Dectin-2 as a direct receptor for mycobacterial mannose-capped lipoarabinomannan with adjuvant and EAE-driving activity extended its ligand repertoire beyond fungi to bacterial glycans and autoimmune contexts.\",\n      \"evidence\": \"Clec4n-/- BMDC cytokine assays, direct binding, antigen-specific T cell assays, EAE and mycobacterial infection models\",\n      \"pmids\": [\"25176311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Man-LAM recognition not yet defined\", \"Contribution to in vivo TB control not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placing PI3Kδ downstream of Syk to control PKCδ and both leukotriene and cytokine output, identifying mannosylated bacterial O-antigens and TLR4 cross-talk, and revealing a Kupffer-cell-restricted phagocytic anti-metastatic function broadened both the signaling map and the physiological roles of Dectin-2.\",\n      \"evidence\": \"PI3Kδ inhibition/knockdown with epistasis, reporter assays with O-antigen ligands and CRD mutants, Dectin-2-/- liver metastasis model, cell-type-specific phagocytosis assays\",\n      \"pmids\": [\"27194783\", \"27358401\", \"27872290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism conferring phagocytic competence specifically on Kupffer cells unresolved\", \"Cancer-cell ligand not yet identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Solving the CRD-Man9GlcNAc2 crystal structure with primary and secondary Ca2+-coordinated mannose sites explained selectivity for Manα1-2Man-containing glycans, and identification of an endogenous β-glucuronidase self-ligand plus Histoplasma-driven NLRP3 activation expanded the receptor's recognition scope.\",\n      \"evidence\": \"X-ray crystallography with ligand, mutagenesis, glycan array; reporter assay with Gusb identification; receptor-deficient DCs with caspase-1/cathepsin B analysis\",\n      \"pmids\": [\"28652405\", \"28046067\", \"28671985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological role of self-ligand recognition unclear\", \"Gusb interaction is single-lab Medium-confidence\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Dissecting a Syk-Ca2+-PKCδ-PAD4 axis driving NADPH-oxidase-independent NETosis and a Dectin-2-Syk-NLRP3 pathway propagating vascular inflammation linked receptor signaling to specific effector programs in neutrophils and vessel-wall macrophages.\",\n      \"evidence\": \"Dectin-2-/- mice, PAD4/Syk/PKCδ inhibitors, NE translocation imaging, CAWS vasculitis model, intravital imaging, NLRP3 and CCL2/CCR2 analysis\",\n      \"pmids\": [\"31693704\", \"31169521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger distinguishing NETosis versus cytokine output not defined\", \"Human relevance of vasculitis mechanism not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying the ERMAP-galectin-9-Dectin-2 trimeric bridging complex as a glycosylation-dependent 'eat me' signal and confirming Dectin-2 as a galactomannan receptor defined a non-microbial phagocytic role and a new fungal ligand.\",\n      \"evidence\": \"Genome-wide CRISPR screen, co-IP of trimeric complex, glycosylation-dependent interaction and phagocytosis assays, liver metastasis model; galactomannan binding and signaling assays with Dectin-2-/- aspergillosis model\",\n      \"pmids\": [\"37813965\", \"36598192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the trimeric bridging complex not resolved\", \"How galectin-9 bridges ERMAP to Dectin-2 mechanistically unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Crystal structures of the extended extracellular domain showed that neck-region-stabilized dimers orient sugar-binding sites for ligand-induced crosslinking and FcRγ clustering, providing the structural mechanism of signal initiation, while N-mannan-driven trained immunity revealed a memory function.\",\n      \"evidence\": \"X-ray crystallography of extended ectodomain, disulfide-variant and TM-replacement analyses, sugar-binding geometry; C. albicans mannosylation mutants and trained immunity protocols\",\n      \"pmids\": [\"39361900\", \"38446996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Threshold of clustering required for signaling not quantified\", \"Epigenetic basis of Dectin-2-driven trained immunity not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating Dectin-2-driven osteoclastogenesis via a Syk/NOX2/ROS/MAPK axis with reduced bone resorption in KO mice extended the receptor's role to non-immune bone remodeling and periodontitis.\",\n      \"evidence\": \"siRNA knockdown, overexpression, pathway inhibition, single-cell sequencing, Dectin-2 KO periodontitis model, histology\",\n      \"pmids\": [\"39800085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Activating ligand in osteoclast context not identified\", \"Single-lab finding without independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single receptor selects between divergent effector outcomes (Th17 versus Th2, cytokine versus NETosis, microbial defense versus phagocytic clearance) and what governs human-specific differences in CLR heterodimerization.\",\n      \"evidence\": \"Not addressed by available timeline evidence\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Determinants of branching among downstream effector programs unknown\", \"Human MCL does not heterodimerize with Dectin-2, complicating cross-species extrapolation\", \"Endogenous self-ligand physiology uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 12, 17, 24]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 3, 5]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [15, 23]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 5, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 9, 10, 16]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [15, 23]}\n    ],\n    \"complexes\": [\n      \"Dectin-2/FcRγ receptor complex\",\n      \"Dectin-2/Dectin-3(MCL) heterodimer\",\n      \"ERMAP-galectin-9-Dectin-2 bridging complex\",\n      \"CARD9-Bcl10-Malt1 signaling module\"\n    ],\n    \"partners\": [\n      \"FCER1G\",\n      \"SYK\",\n      \"CARD9\",\n      \"CLEC4D\",\n      \"LGALS9\",\n      \"ERMAP\",\n      \"PLCG2\",\n      \"BCL10\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}