{"gene":"CARD9","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2000,"finding":"CARD9 is a novel CARD-containing protein that interacts selectively with the CARD activation domain of BCL10 via homophilic CARD-CARD interactions, self-associates through coiled-coil motifs, and activates NF-κB when expressed in cells. Endogenous CARD9 was found constitutively associated with BCL10, indicating a pre-existing signaling complex.","method":"Mammalian two-hybrid analysis, co-immunoprecipitation of endogenous proteins, NF-κB reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal co-IP of endogenous proteins, two-hybrid identification, reporter assay; single lab but multiple orthogonal methods","pmids":["11053425"],"is_preprint":false},{"year":2006,"finding":"CARD9 is an essential transducer of Dectin-1 signaling in myeloid cells. CARD9 couples Dectin-1 (an ITAM-related innate receptor for fungal β-glucan/zymosan) to BCL10-MALT1-mediated canonical NF-κB activation, mediating cytokine production and innate anti-fungal immunity. CARD9 is dispensable for TLR/MyD88-induced responses and for antigen receptor signaling that uses CARMA1 as the BCL10-MALT1 linker.","method":"Card9−/− mouse generation, zymosan/Dectin-1 stimulation assays, NF-κB reporter assays, cytokine ELISA, genetic reconstitution","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with defined phenotype, genetic epistasis establishing pathway position, replicated across multiple subsequent studies","pmids":["16862125"],"is_preprint":false},{"year":2006,"finding":"CARD9 is required for Nod2-mediated activation of p38 and JNK (but not NF-κB) in macrophages responding to intracellular pathogens. CARD9 inducibly associates with both Nod2 and the serine-threonine kinase RICK (RIPK2) after bacterial or viral infection.","method":"Card9−/− mouse generation, co-immunoprecipitation of CARD9 with Nod2 and RICK, kinase activation assays (p38, JNK), Listeria monocytogenes infection model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO mice with defined signaling phenotype plus reciprocal co-IP identifying novel complex; single lab, multiple orthogonal methods","pmids":["17187069"],"is_preprint":false},{"year":2007,"finding":"CARD9 (not CARMA1/CARD11) is required for NF-κB activation downstream of ITAM-associated receptors (FcRγ and DAP12) on myeloid cells, and for TLR-induced MAPK activation in dendritic cells. CARD9 forms a complex with BCL10 in myeloid cells analogous to the CARMA1-BCL10-MALT1 complex in lymphocytes, establishing cell-type-specific adaptor usage for ITAM signaling.","method":"Card9−/−, Card11−/−, Bcl10−/− mouse comparisons; NF-κB activation assays; co-immunoprecipitation; cytokine production assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO mouse strains with defined epistasis, co-IP, replicated by independent group (PMID 17450144)","pmids":["17486093"],"is_preprint":false},{"year":2007,"finding":"Dectin-1-Syk-CARD9 signaling induces DC maturation and secretion of IL-6, TNF, and IL-23 (but little IL-12), and is required for CARD9-dependent Th17 responses to Candida albicans infection in vivo.","method":"Card9−/− mice, Candida albicans infection model, cytokine ELISA, T cell differentiation assays, dectin-1 agonist adjuvant experiments","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mice with defined in vivo phenotype, multiple cytokine readouts; replicated by multiple labs","pmids":["17450144"],"is_preprint":false},{"year":2009,"finding":"RIG-I-mediated NF-κB activation during RNA virus infection requires MAVS and a CARD9-BCL10 complex, establishing CARD9-BCL10 as an essential module downstream of RIG-I for proinflammatory (but not inflammasome) signaling. RIG-I-triggered inflammasome activation proceeds independently of CARD9.","method":"Card9−/− and Bcl10−/− cells, RNA virus infection assays, NF-κB reporter assays, IL-1β production measurement, co-immunoprecipitation","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO cells defining pathway position, clear positive and negative results separating two pathways; single lab, multiple orthogonal methods","pmids":["19915568"],"is_preprint":false},{"year":2009,"finding":"A homozygous Q295X loss-of-function mutation in CARD9 causes autosomal recessive susceptibility to chronic mucocutaneous candidiasis, associated with low Th17 cell numbers. Genetic reconstitution of CARD9-deficient myeloid cells showed the Q295X allele impairs dectin-1-induced innate signaling.","method":"Homozygosity mapping, Sanger sequencing, T cell phenotyping, genetic reconstitution of Card9−/− myeloid cells","journal":"The New England journal of medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics plus functional reconstitution experiment; replicated in many subsequent studies across populations","pmids":["19864672"],"is_preprint":false},{"year":2010,"finding":"CARD9 mediates Dectin-2-induced IκBα kinase (IKK) ubiquitination to activate NF-κB in response to C. albicans hyphae, while Syk regulates IKK phosphorylation. Hyphal stimulation specifically induces CARD9 association with BCL10 via Dectin-2 (not Dectin-1).","method":"siRNA knockdown of Dectin-1 and Dectin-2, NF-κB reporter assay, co-immunoprecipitation of CARD9-BCL10, ubiquitination assays on IKK","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection with co-IP, ubiquitination assay, and receptor-specific knockdown; single lab but multiple orthogonal methods","pmids":["20538615"],"is_preprint":false},{"year":2012,"finding":"Protein kinase C-δ (PKCδ) is activated downstream of Dectin-1-Syk signaling and phosphorylates CARD9 at Thr231, which is required for CARD9-BCL10 complex assembly and canonical NF-κB activation. Prkcd−/− but not PKCα-, PKCβ-, or PKCθ-deficient DCs are defective in innate responses to Dectin-1, Dectin-2, and Mincle.","method":"Prkcd−/− mice, in vitro kinase assay, CARD9 phosphorylation mapping, co-immunoprecipitation of CARD9-BCL10, Candida albicans infection model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay identifying phosphorylation site, KO mice with defined phenotype, co-IP of complex; single lab but multiple orthogonal methods","pmids":["22265677"],"is_preprint":false},{"year":2014,"finding":"CARD9 mediates Dectin-1-induced ERK activation by linking Ras-GRF1 to H-Ras. Syk-dependent phosphorylation of Ras-GRF1 enables it to recruit and activate H-Ras through a complex with CARD9, leading to downstream ERK activation and proinflammatory responses. This ERK pathway is independent of CARD9-mediated NF-κB activation.","method":"Co-immunoprecipitation of CARD9-RasGRF1-H-Ras complex, ERK kinase assays, Card9−/− macrophages/DCs, ERK inhibitor in vivo survival experiments","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP of trimeric complex, KO cells, in vivo functional validation; single lab, multiple orthogonal methods","pmids":["25267792"],"is_preprint":false},{"year":2014,"finding":"Cytosolic Rad50 directly interacts with CARD9. Transfection of dsDNA or DNA virus infection induces formation of dsDNA-Rad50-CARD9 signaling complexes that activate NF-κB and generate pro-IL-1β. Primary cells lacking Rad50 or CARD9 exhibit defective DNA-induced IL-1β production.","method":"Co-immunoprecipitation of endogenous Rad50-CARD9, pulldown assays, dsDNA transfection assay, Card9−/− primary cells and mice, DNA virus infection model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct interaction identified by co-IP, KO cells with defined phenotype, in vivo confirmation; single lab, multiple orthogonal methods","pmids":["24777530"],"is_preprint":false},{"year":2014,"finding":"The interaction between NOD2 and CARD9 is mediated not by the CARDs of each protein as previously proposed, but by two sites on NOD2: the CARD-NACHT linker region and the NACHT domain itself.","method":"Pulldown and co-immunoprecipitation mapping experiments using truncation and domain mutants of NOD2 and CARD9","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — domain-mapping pulldown experiments, single lab, single method type; corrects prior assumption","pmids":["24960071"],"is_preprint":false},{"year":2015,"finding":"A hypomorphic CARD9 p.Y91H mutation impairs the ability of CARD9 to complex with RASGRF1, leading to impaired NF-κB and ERK activation in monocytes and defective GM-CSF responses. CARD9-BCL10-MALT1 complex formation is intact in these patients, demonstrating that the CARD9/RASGRF1/ERK/GM-CSF axis is distinct from the CBM complex pathway.","method":"Co-immunoprecipitation of CARD9 with RASGRF1 and BCL10/MALT1, NF-κB and ERK activation assays in patient monocytes, clinical GM-CSF rescue","journal":"The Journal of allergy and clinical immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP with patient-derived cells, kinase activation assays, clinical rescue; single lab, multiple orthogonal methods","pmids":["26521038"],"is_preprint":false},{"year":2016,"finding":"Vav1, Vav2, and Vav3 GEF proteins are key activators of the CARD9 pathway downstream of Dectin-1, Dectin-2, and Mincle, required for NF-κB control and proinflammatory gene transcription. Vav1/2/3−/− mice phenocopy Card9−/− animals with extreme fungal susceptibility.","method":"Vav1/2/3 triple-KO mice, NF-κB reporter assays, cytokine production assays, Candida infection models","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO mice with defined pathway epistasis, multiple CLR stimuli tested, functional phenotype; single lab, multiple orthogonal methods","pmids":["27926862"],"is_preprint":false},{"year":2018,"finding":"The CARD9 S12N variant (rs4077515) mediates CLR-induced activation of the non-canonical NF-κB subunit RelB, leading to IL-5 production in alveolar macrophages and type 2 immune responses with eosinophil recruitment. Wild-type CARD9 does not activate RelB or induce IL-5 in this context.","method":"CARD9S12N knock-in mice, NF-κB subunit activation assays (RelB), IL-5 ELISA, eosinophil recruitment assays, patient PBMC studies","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knock-in mouse model with defined signaling phenotype, patient validation; single lab, multiple orthogonal methods","pmids":["29777223"],"is_preprint":false},{"year":2018,"finding":"The CARD9 R70W mutation prevents NF-κB activation by blocking productive interactions with BCL10 and MALT1, thereby preventing assembly of the filamentous CARD9-BCL10-MALT1 (CBM) signalosome. Structural analysis maps R70 to the interface between successive CARD domains in CARD9 filaments.","method":"Reporter assays, co-immunoprecipitation of CBM complex, confocal imaging of BCL10 filament assemblies, structural analysis of CARD domain interface","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, reporter assay, imaging; single lab, no in vitro reconstitution; structural inference from modeling","pmids":["30429846"],"is_preprint":false},{"year":2019,"finding":"Cryo-EM structure of the CARD9 filament and crystal structure of an autoinhibited CARD9 fragment (CARD-coiled-coil interface) were determined. Autoinhibition is mediated by an extensive intramolecular interface between the CARD and coiled-coil domains. Disruption of this interface leads to hyperactivation in cells and formation of BCL10-templating filaments in vitro. CARD9 and CARD11 share similar but distinct autoinhibition mechanisms.","method":"Cryo-EM structure determination, crystal structure, in vitro filament reconstitution, gain-of-function mutagenesis with NF-κB reporter assays in cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM and crystal structures combined with in vitro reconstitution of filaments and functional mutagenesis; multiple orthogonal methods in single study","pmids":["31296852"],"is_preprint":false},{"year":2019,"finding":"CARD9 in microglia promotes IL-1β production (via both transcriptional regulation of Il1b and inflammasome activation) and CXCL1 production in response to CNS Candida infection, driving CXCR2+ neutrophil recruitment. Microglia-specific Card9 deletion impairs IL-1β and CXCL1 production and increases fungal proliferation in the CNS.","method":"Microglia-specific Card9 conditional KO mice, IL-1β and CXCL1 ELISA, neutrophil recruitment quantification, CNS Candida infection model, p38 kinase assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with defined mechanistic readouts; replicated in human CARD9-deficient patients","pmids":["30996332"],"is_preprint":false},{"year":2019,"finding":"Dok3 recruits protein phosphatase 1 (PP1) to dephosphorylate CARD9, dampening downstream NF-κB and JNK activation and antifungal immune responses in neutrophils. Dok3 deficiency enhances phagocytosis, cytokine production, and survival against Candida albicans infection.","method":"Dok3−/− mice, co-immunoprecipitation of Dok3-PP1-CARD9, CARD9 phosphorylation assays, NF-κB/JNK activation assays, in vivo Candida infection model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP of trimeric complex, phosphorylation assays, KO mice with defined phenotype; single lab, multiple orthogonal methods","pmids":["31180338"],"is_preprint":false},{"year":2019,"finding":"CARD9 in dendritic cells is required for development of autoimmune disease in Lyn-deficient mice via a CD11b-Syk-PKCδ-CARD9 pathway. In the absence of Lyn, this pathway is amplified, leading to increased TLR-induced production of inflammatory cytokines. Dendritic cell-specific CARD9 deletion reversed autoimmunity and experimental colitis in Lyn-deficient mice.","method":"Cell-type-specific (DC-specific) Card9 KO, co-immunoprecipitation, cytokine assays, DSS and IL-10-deficiency colitis models","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined cell-type-specific mechanism, pathway epistasis; single lab, multiple orthogonal methods","pmids":["31594855"],"is_preprint":false},{"year":2019,"finding":"CARD9 in neutrophils mediates mitochondrial function; loss of CARD9 causes mitochondrial dysfunction with increased reactive oxygen species production and premature neutrophil apoptosis, particularly in oxidative environments. This impaired neutrophil survival reduces tissue fungal containment and increases susceptibility to intestinal inflammation.","method":"Neutrophil-specific and epithelial-specific conditional Card9 KO mice, DSS colitis model, Seahorse bioenergetics profiling, apoptosis assays, proteomics, in vivo fungal infection model","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional cell-type-specific KO, bioenergetics profiling (Seahorse), apoptosis assays, multiple orthogonal methods; single lab","pmids":["36167663"],"is_preprint":false},{"year":2020,"finding":"CARD9 interacts directly with Rubicon (a negative regulator of autophagy) in cardiomyocytes, and this interaction enhances UVRAG-Beclin1-PI3KC3 interaction and UVRAG-Vps16-mediated Rab7 activation to promote autophagosome formation, maturation, and endocytosis. CARD9 overexpression increases autophagic flux; CARD9 loss impairs autophagy and worsens myocardial I/R injury.","method":"Co-immunoprecipitation of CARD9-Rubicon, Rubicon siRNA rescue, LC3 lipidation and p62 assays, autophagy flux assays (BafA1/3-MA), CARD9−/− mice in I/R model","journal":"Basic research in cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying novel interaction, rescue experiment with siRNA, KO mice; single lab, multiple but focused methods","pmids":["32248306"],"is_preprint":false},{"year":2019,"finding":"CARD9 protects cardiomyocytes from mitochondria-dependent apoptosis by interacting with Apaf-1 via its CARD domain, suppressing caspase-9 activation and apoptosome formation under oxidative stress.","method":"Co-immunoprecipitation of CARD9-Apaf-1, CARD domain deletion mutants, caspase-3 and -9 activation assays, CARD9−/− mice in I/R model, TUNEL staining","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping, KO mice; single lab, multiple orthogonal methods","pmids":["31212066"],"is_preprint":false},{"year":2021,"finding":"OTUD1 deubiquitinase directly interacts with CARD9 and removes polyubiquitin chains from CARD9, promoting canonical NF-κB and MAPK pathway activation in the context of antifungal immunity. OTUD1 deficiency impairs CARD9-mediated cytokine production and increases fungal susceptibility in vivo.","method":"Co-immunoprecipitation of OTUD1-CARD9, deubiquitination assay in vitro, Otud1−/− mice, NF-κB/MAPK activation assays, Candida infection model","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct deubiquitination assay plus co-IP and KO mice with in vivo phenotype; single lab, multiple orthogonal methods","pmids":["33789983"],"is_preprint":false},{"year":2024,"finding":"OTUD1 removes K33-linked ubiquitin from CARD9 (without affecting CARD9 stability) to promote assembly of the CARD9-BCL10-MALT1 (CBM) complex in macrophages, resulting in NF-κB activation and inflammatory gene expression in the context of isoproterenol-induced cardiac stress.","method":"Co-immunoprecipitation of OTUD1-CARD9, ubiquitin linkage-specific deubiquitination assays, CBM complex pull-down, myeloid-specific KO mice, NF-κB reporter assays","journal":"Clinical and translational medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — linkage-specific deubiquitination assay identifying K33-ubiquitin, co-IP, conditional KO mice; single lab, multiple orthogonal methods","pmids":["39118286"],"is_preprint":false},{"year":2021,"finding":"Antifungal IgG production by gut commensal fungi depends on CARD9 and CARD9+CX3CR1+ macrophages. In individuals with CARD9 loss-of-function mutations, antifungal IgG responses are impaired, revealing a role for CARD9 in coordinating innate-to-adaptive humoral immunity against mycobiota.","method":"Card9−/− mice, fungal colonization models, germinal center B cell analysis, systemic antibody profiling, human patient CARD9 mutation analysis, macrophage-specific functional assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mice plus human patient validation, multiple orthogonal methods including GC analysis and antibody profiling; independently supported by patient data","pmids":["33548172"],"is_preprint":false},{"year":2014,"finding":"CARD9 mediates Dectin-3-induced Mincle expression via the CARD9-BCL10-MALT1 complex and NF-κB (but not NFAT) activation. NF-κB binds the Mincle promoter, and CARD9- or Dectin-3-deficient macrophages fail to upregulate Mincle in response to TDM (mycobacterial trehalose 6,6'-dimycolate).","method":"Dectin-3−/− and Card9−/− bone marrow-derived macrophages, NF-κB/NFAT reporter assays, chromatin immunoprecipitation of NF-κB at Mincle promoter, cytokine ELISA, immunization experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO macrophages, ChIP at promoter, reporter assays; single lab, multiple orthogonal methods","pmids":["25202022"],"is_preprint":false},{"year":2016,"finding":"CARD9 promotes recovery from colitis partly by enabling the gut microbiota to metabolize tryptophan into aryl hydrocarbon receptor (AHR) ligands, which promote IL-22 production. Transfer of Card9−/− microbiota to germ-free wild-type recipients increases colitis susceptibility, and the Card9−/− microbiota fails to produce AHR ligands from tryptophan.","method":"Card9−/− mice, germ-free recipient microbiota transfer, metabolomics (tryptophan metabolites), AHR agonist treatment, Lactobacillus inoculation, IL-22 measurement","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — germ-free transfer experiment establishing causal role, metabolomics, functional rescue; replicated and widely cited","pmids":["27158904"],"is_preprint":false},{"year":2011,"finding":"AIRE forms a transient complex with phosphorylated Syk and CARD9 at the cell membrane after Dectin-1 ligation, participating in the Dectin-1 signaling pathway to support TNF-α production. Reducing AIRE expression in THP-1 cells decreases TNF-α release after Dectin-1 ligation.","method":"Co-immunoprecipitation of AIRE-pSyk-CARD9, confocal microscopy of AIRE-Dectin-1 co-localization, siRNA knockdown, PBMC stimulation assays from APECED patients","journal":"The Journal of allergy and clinical immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP identifying complex, confocal localization, siRNA knockdown; single lab, functional link partially demonstrated","pmids":["21962774"],"is_preprint":false},{"year":2014,"finding":"CARD9 promotes metastasis-associated macrophage polarization through NF-κB activation. Tumor cell-secreted VEGF activates Syk in macrophages, which is necessary for formation of the CARD9-BCL10-MALT1 complex. Card9−/− bone marrow promotes less liver metastasis of colon carcinoma cells.","method":"Card9−/− bone marrow transplantation, co-immunoprecipitation of CARD9-BCL10-MALT1, NF-κB activation assays, VEGF/Syk pathway inhibition, in vivo metastasis model","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of CBM complex in tumor context, KO bone marrow transplant, defined pathway; single lab","pmids":["24722209"],"is_preprint":false}],"current_model":"CARD9 is a myeloid-enriched cytosolic adaptor that nucleates a CARD9-BCL10-MALT1 (CBM) signalosome filament—held in an autoinhibited CARD–coiled-coil conformation until PKCδ phosphorylates CARD9 at Thr231 (downstream of Syk and Vav GEFs) to trigger BCL10/MALT1 recruitment and canonical NF-κB activation; CARD9 also drives a parallel ERK pathway by linking Ras-GRF1 to H-Ras, activates p38/JNK via Nod2-RICK interactions for intracellular pathogen responses, signals through a Rad50 complex for cytosolic DNA-induced IL-1β, promotes autophagy by sequestering Rubicon and inhibits cardiomyocyte apoptosis by blocking Apaf-1-dependent apoptosome formation; its activity is positively regulated by OTUD1-mediated K33-deubiquitination and negatively regulated by Dok3-recruited PP1-mediated dephosphorylation, while the S12N variant aberrantly activates non-canonical RelB-NF-κB to drive IL-5 and type 2 responses."},"narrative":{"mechanistic_narrative":"CARD9 is a myeloid-enriched cytosolic CARD-coiled-coil adaptor that couples innate pattern-recognition receptors to NF-κB and MAPK signaling, serving as the central transducer of antifungal immunity [PMID:16862125, PMID:19864672]. It selectively binds the CARD of BCL10 through homophilic CARD-CARD interactions and self-associates via coiled-coil motifs to seed a CARD9-BCL10-MALT1 (CBM) signalosome [PMID:11053425]; cryo-EM and crystallographic analysis show CARD9 is held in an autoinhibited state by an intramolecular CARD-coiled-coil interface whose disruption produces BCL10-templating filaments and hyperactivation [PMID:31296852]. In myeloid cells CARD9 is the obligate BCL10-MALT1 linker (in place of CARMA1/CARD11) downstream of ITAM-coupled C-type lectin receptors—Dectin-1, Dectin-2, Dectin-3, and Mincle—and FcRγ/DAP12 receptors, where Syk-activated Vav GEFs and PKCδ converge on CARD9, the latter phosphorylating Thr231 to license CBM assembly and canonical NF-κB activation [PMID:17486093, PMID:22265677, PMID:27926862, PMID:25202022]. This pathway drives proinflammatory and IL-23/Th17 cytokine programs essential for clearing Candida albicans [PMID:17450144], and germline loss-of-function mutations (Q295X) cause autosomal recessive chronic mucocutaneous candidiasis with deficient Th17 immunity [PMID:19864672]. CARD9 additionally branches into NF-κB-independent outputs: it links Ras-GRF1 to H-Ras for ERK activation [PMID:25267792], cooperates with Nod2/RICK to drive p38 and JNK during intracellular infection [PMID:17187069], and assembles a cytosolic Rad50 complex for DNA-induced IL-1β [PMID:24777530]. Its activity is set by post-translational control—OTUD1-mediated removal of K33-linked ubiquitin promotes CBM assembly [PMID:33789983, PMID:39118286], while Dok3-recruited PP1 dephosphorylates CARD9 to dampen signaling [PMID:31180338]. The S12N variant aberrantly activates non-canonical RelB to produce IL-5 and type 2 responses [PMID:29777223]. Beyond immune signaling, CARD9 shapes mucosal homeostasis by enabling microbiota tryptophan metabolism into AHR ligands driving IL-22 [PMID:27158904] and coordinating antifungal IgG responses [PMID:33548172].","teleology":[{"year":2000,"claim":"Established CARD9's biochemical core: how it nucleates an NF-κB-activating complex, by showing selective CARD-CARD binding to BCL10 and coiled-coil self-association.","evidence":"Mammalian two-hybrid, co-IP of endogenous CARD9-BCL10, NF-κB reporter assay","pmids":["11053425"],"confidence":"High","gaps":["No physiological receptor or upstream trigger identified","No structural basis for self-association"]},{"year":2006,"claim":"Placed CARD9 in a pathway by defining it as the essential transducer linking Dectin-1 to BCL10-MALT1 and antifungal NF-κB, distinct from TLR/MyD88 and CARMA1 routes.","evidence":"Card9−/− mice, zymosan/Dectin-1 stimulation, cytokine ELISA, genetic reconstitution","pmids":["16862125"],"confidence":"High","gaps":["Mechanism of CARD9 activation downstream of receptor not resolved","Cell-type specificity not yet formalized"]},{"year":2006,"claim":"Revealed a parallel CARD9 output by showing it is required for Nod2-mediated p38/JNK (not NF-κB) activation against intracellular pathogens via inducible Nod2/RICK association.","evidence":"Card9−/− mice, co-IP with Nod2 and RICK, p38/JNK kinase assays, Listeria infection","pmids":["17187069"],"confidence":"High","gaps":["Domain basis of Nod2 interaction unresolved (later revised)","How CARD9 selectively routes to MAPK vs NF-κB unknown"]},{"year":2007,"claim":"Generalized CARD9 as the myeloid counterpart of CARMA1, required for ITAM (FcRγ/DAP12)-driven NF-κB and TLR-induced MAPK, establishing cell-type-specific adaptor usage.","evidence":"Card9−/−, Card11−/−, Bcl10−/− mouse comparisons, co-IP, cytokine assays","pmids":["17486093","17450144"],"confidence":"High","gaps":["Th17-driving cytokine circuit defined but transcriptional control unclear"]},{"year":2009,"claim":"Extended CARD9-BCL10 module to antiviral signaling, showing it is essential for RIG-I/MAVS-driven proinflammatory NF-κB but dispensable for inflammasome activation.","evidence":"Card9−/− and Bcl10−/− cells, RNA virus infection, NF-κB and IL-1β readouts, co-IP","pmids":["19915568"],"confidence":"High","gaps":["Connection between RIG-I/MAVS and CARD9 recruitment not mechanistically resolved"]},{"year":2009,"claim":"Connected CARD9 to human disease, establishing that biallelic Q295X loss-of-function causes chronic mucocutaneous candidiasis with impaired Th17 immunity.","evidence":"Homozygosity mapping, Sanger sequencing, T cell phenotyping, reconstitution of Card9−/− myeloid cells","pmids":["19864672"],"confidence":"High","gaps":["Molecular consequence of Q295X truncation on signalosome not defined at structural level"]},{"year":2010,"claim":"Refined receptor specificity by showing Dectin-2/hyphae use CARD9-BCL10 to drive IKK ubiquitination, dissecting it from Syk-driven IKK phosphorylation.","evidence":"siRNA knockdown of Dectin-1/2, co-IP, IKK ubiquitination assays, NF-κB reporter","pmids":["20538615"],"confidence":"High","gaps":["Ubiquitin ligase mediating IKK modification not identified"]},{"year":2012,"claim":"Identified the molecular switch for CBM assembly: PKCδ phosphorylates CARD9 at Thr231 downstream of Syk to enable BCL10 recruitment and canonical NF-κB.","evidence":"Prkcd−/− mice, in vitro kinase assay, phosphosite mapping, co-IP, Candida infection","pmids":["22265677"],"confidence":"High","gaps":["How Thr231 phosphorylation relieves autoinhibition not yet structurally explained"]},{"year":2014,"claim":"Defined an NF-κB-independent ERK branch in which CARD9 bridges Syk-phosphorylated Ras-GRF1 to H-Ras for proinflammatory ERK signaling.","evidence":"Co-IP of CARD9-RasGRF1-H-Ras, ERK kinase assays, Card9−/− cells, in vivo ERK inhibition","pmids":["25267792"],"confidence":"High","gaps":["Structural basis of the trimeric complex unresolved","How CARD9 partitions between ERK and CBM outputs unclear"]},{"year":2014,"claim":"Uncovered a cytosolic DNA-sensing role: Rad50 directly binds CARD9 to form dsDNA-Rad50-CARD9 complexes generating pro-IL-1β.","evidence":"Co-IP of endogenous Rad50-CARD9, pulldowns, dsDNA transfection, Card9−/− cells, DNA virus model","pmids":["24777530"],"confidence":"High","gaps":["Inflammasome coupling downstream of Rad50-CARD9 not fully defined"]},{"year":2014,"claim":"Revised the NOD2-CARD9 interaction model, mapping it to the NOD2 CARD-NACHT linker and NACHT domain rather than reciprocal CARDs.","evidence":"Pulldown/co-IP domain mapping with NOD2 and CARD9 truncation mutants","pmids":["24960071"],"confidence":"Medium","gaps":["Single method type (pulldown mapping)","Functional consequence of revised interface not tested"]},{"year":2014,"claim":"Showed CARD9 drives transcriptional feed-forward by mediating Dectin-3-induced Mincle expression through CBM/NF-κB binding at the Mincle promoter.","evidence":"Dectin-3−/− and Card9−/− macrophages, ChIP at Mincle promoter, reporter assays","pmids":["25202022"],"confidence":"High","gaps":["Cooperating transcription factors at Mincle locus not defined"]},{"year":2015,"claim":"Confirmed the ERK branch in humans by showing the hypomorphic Y91H mutation selectively impairs CARD9-RASGRF1 complex/GM-CSF responses while leaving CBM assembly intact.","evidence":"Co-IP of CARD9 with RASGRF1 and BCL10/MALT1, NF-κB/ERK assays in patient monocytes, clinical GM-CSF rescue","pmids":["26521038"],"confidence":"High","gaps":["Why this axis is uniquely sensitive to Y91H not structurally explained"]},{"year":2016,"claim":"Defined upstream GEF activators, showing Vav1/2/3 are required to engage CARD9 across multiple CLRs, with triple-KO phenocopying Card9−/−.","evidence":"Vav1/2/3 triple-KO mice, NF-κB reporter and cytokine assays, Candida models","pmids":["27926862"],"confidence":"High","gaps":["Direct biochemical link from Vav GEFs to CARD9 not mapped"]},{"year":2016,"claim":"Extended CARD9 to mucosal homeostasis, demonstrating it enables microbiota tryptophan-to-AHR-ligand metabolism that drives IL-22 and colitis recovery.","evidence":"Card9−/− mice, germ-free microbiota transfer, metabolomics, AHR agonist rescue, IL-22 measurement","pmids":["27158904"],"confidence":"High","gaps":["Cell-intrinsic CARD9 events shaping microbiota composition not fully delineated"]},{"year":2018,"claim":"Defined a gain-of-function variant: S12N redirects CLR signaling to non-canonical RelB, driving IL-5 and type 2 immunity not seen with wild-type CARD9.","evidence":"CARD9 S12N knock-in mice, RelB activation assays, IL-5 ELISA, eosinophil recruitment, patient PBMCs","pmids":["29777223"],"confidence":"High","gaps":["Structural basis by which S12N favors RelB not resolved"]},{"year":2018,"claim":"Linked CARD9 filament architecture to disease by showing R70W blocks BCL10/MALT1 interactions and CBM filament assembly at a CARD-CARD interface.","evidence":"Reporter assays, CBM co-IP, confocal imaging of BCL10 filaments, structural interface analysis","pmids":["30429846"],"confidence":"Medium","gaps":["No in vitro reconstitution","Interface inference from modeling"]},{"year":2019,"claim":"Provided the structural framework: cryo-EM filament and autoinhibited crystal structures showing CARD-coiled-coil autoinhibition that, when disrupted, templates BCL10 filaments.","evidence":"Cryo-EM, crystal structure, in vitro filament reconstitution, gain-of-function mutagenesis with reporter assays","pmids":["31296852"],"confidence":"High","gaps":["How physiological phosphorylation (Thr231) maps onto autoinhibition release not directly shown"]},{"year":2019,"claim":"Defined post-translational tuning by phosphatase: Dok3 recruits PP1 to dephosphorylate CARD9 and dampen NF-κB/JNK and antifungal immunity.","evidence":"Dok3−/− mice, co-IP of Dok3-PP1-CARD9, phosphorylation and activation assays, Candida model","pmids":["31180338"],"confidence":"High","gaps":["Target residue(s) dephosphorylated by PP1 not mapped"]},{"year":2019,"claim":"Expanded CARD9 into tissue-specific and pathological roles: microglial CARD9 drives IL-1β/CXCL1 and neutrophil recruitment in CNS candidiasis, and DC CARD9 amplifies autoimmunity in Lyn-deficiency.","evidence":"Microglia- and DC-specific conditional Card9 KO mice, cytokine ELISA, colitis/autoimmunity models, p38 assays","pmids":["30996332","31594855"],"confidence":"High","gaps":["Tissue-specific differences in CARD9 wiring not mechanistically separated"]},{"year":2019,"claim":"Revealed non-signalosome functions: CARD9 supports neutrophil mitochondrial function/survival and protects cardiomyocytes from apoptosome formation via CARD-domain binding to Apaf-1.","evidence":"Conditional Card9 KO mice with Seahorse profiling and apoptosis assays; co-IP of CARD9-Apaf-1 with domain mapping, caspase assays, I/R model","pmids":["36167663","31212066"],"confidence":"High","gaps":["Apaf-1 finding is Medium-confidence single-lab co-IP","Mechanism connecting CARD9 to neutrophil mitochondrial regulation unclear"]},{"year":2020,"claim":"Identified an autophagy-promoting role: CARD9 binds Rubicon in cardiomyocytes to enhance UVRAG-Beclin1-PI3KC3 and Rab7-dependent autophagosome maturation.","evidence":"Co-IP of CARD9-Rubicon, Rubicon siRNA rescue, LC3/p62 and autophagy flux assays, Card9−/− I/R model","pmids":["32248306"],"confidence":"Medium","gaps":["Single-lab co-IP","Whether this is myeloid-relevant or cardiomyocyte-restricted unclear"]},{"year":2021,"claim":"Established ubiquitin-based positive regulation: OTUD1 directly deubiquitinates CARD9 (removing K33-linked chains) to promote CBM assembly and NF-κB/MAPK output.","evidence":"Co-IP of OTUD1-CARD9, in vitro and linkage-specific deubiquitination assays, Otud1−/− and myeloid-specific KO mice, Candida and cardiac stress models","pmids":["33789983","39118286"],"confidence":"High","gaps":["E3 ligase adding K33 chains to CARD9 not identified"]},{"year":2021,"claim":"Connected CARD9 to humoral immunity, showing CARD9+CX3CR1+ macrophages coordinate antifungal IgG against gut mycobiota, impaired in CARD9-deficient patients.","evidence":"Card9−/− mice, fungal colonization, germinal center analysis, antibody profiling, human patient validation","pmids":["33548172"],"confidence":"High","gaps":["Signaling events linking CARD9 to GC/B-cell help not mapped"]},{"year":null,"claim":"How CARD9's physiological phosphorylation, K33-deubiquitination, and receptor-specific inputs are integrated to release autoinhibition and select among the CBM, ERK, MAPK, and apoptotic/autophagic outputs remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of phosphorylated/activated CARD9 in receptor context","Quantitative rules governing output selection unknown","E3 ligase counterpart of OTUD1 unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,9,10]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,26]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[16]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,10]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[28]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,4,6,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,8,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[21]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[22]}],"complexes":["CARD9-BCL10-MALT1 (CBM) signalosome","dsDNA-Rad50-CARD9 complex"],"partners":["BCL10","MALT1","NOD2","RIPK2","RASGRF1","RAD50","OTUD1","APAF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H257","full_name":"Caspase recruitment domain-containing protein 9","aliases":[],"length_aa":536,"mass_kda":62.2,"function":"Adapter protein that plays a key role in innate immune response against fungi by forming signaling complexes downstream of C-type lectin receptors (PubMed:26961233, PubMed:33558980). CARD9-mediated signals are essential for antifungal immunity against a subset of fungi from the phylum Ascomycota (PubMed:24231284, PubMed:25057046, PubMed:25702837, PubMed:26521038, PubMed:26679537, PubMed:26961233, PubMed:27777981, PubMed:29080677, PubMed:33558980). Transduces signals in myeloid cells downstream of C-type lectin receptors CLEC7A (dectin-1), CLEC6A (dectin-2) and CLEC4E (Mincle), which detect pathogen-associated molecular pattern metabolites (PAMPs), such as fungal carbohydrates, and trigger CARD9 activation (By similarity). Upon activation, CARD9 homooligomerizes to form a nucleating helical template that recruits BCL10 via CARD-CARD interaction, thereby promoting polymerization of BCL10 and subsequent recruitment of MALT1: this leads to activation of NF-kappa-B and MAP kinase p38 (MAPK11, MAPK12, MAPK13 and/or MAPK14) pathways which stimulate expression of genes encoding pro-inflammatory cytokines and chemokines (PubMed:11053425, PubMed:26488816, PubMed:26961233, PubMed:31296852, PubMed:33558980). CARD9 signaling in antigen-presenting cells links innate sensing of fungi to the activation of adaptive immunity and provides a cytokine milieu that induces the development and subsequent of interleukin 17-producing T helper (Th17) cells (PubMed:24231284). Also involved in activation of myeloid cells via classical ITAM-associated receptors and TLR: required for TLR-mediated activation of MAPK, while it is not required for TLR-induced activation of NF-kappa-B (By similarity). CARD9 can also be engaged independently of BCL10: forms a complex with RASGRF1 downstream of C-type lectin receptors, which recruits and activates HRAS, leading to ERK activation and the production of cytokines (By similarity). Acts as an important regulator of the intestinal commensal fungi (mycobiota) component of the gut microbiota (PubMed:33548172). Plays an essential role in antifungal immunity against dissemination of gut fungi: acts by promoting induction of antifungal IgG antibodies response in CX3CR1(+) macrophages to confer protection against disseminated C.albicans or C.auris infection (PubMed:33548172). Also mediates immunity against other pathogens, such as certain bacteria, viruses and parasites; CARD9 signaling is however redundant with other innate immune responses (By similarity). In response to L.monocytogenes infection, required for the production of inflammatory cytokines activated by intracellular peptidoglycan: acts by connecting NOD2 recognition of peptidoglycan to downstream activation of MAP kinases (MAPK) without activating NF-kappa-B (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9H257/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CARD9","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/CARD9","total_profiled":1310},"omim":[{"mim_id":"616755","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 62; TRIM62","url":"https://www.omim.org/entry/616755"},{"mim_id":"612022","title":"OTU DOMAIN-CONTAINING PROTEIN 1; OTUD1","url":"https://www.omim.org/entry/612022"},{"mim_id":"612006","title":"CELIAC DISEASE, SUSCEPTIBILITY TO, 8; CELIAC8","url":"https://www.omim.org/entry/612006"},{"mim_id":"608537","title":"VON HIPPEL-LINDAU TUMOR SUPPRESSOR; VHL","url":"https://www.omim.org/entry/608537"},{"mim_id":"607212","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 9; CARD9","url":"https://www.omim.org/entry/607212"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":6.8},{"tissue":"lymphoid tissue","ntpm":8.1}],"url":"https://www.proteinatlas.org/search/CARD9"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9H257","domains":[{"cath_id":"1.10.533.10","chopping":"7-151","consensus_level":"medium","plddt":91.0059,"start":7,"end":151},{"cath_id":"1.20.5","chopping":"283-377","consensus_level":"medium","plddt":96.0612,"start":283,"end":377}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H257","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H257-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H257-F1-predicted_aligned_error_v6.png","plddt_mean":80.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CARD9","jax_strain_url":"https://www.jax.org/strain/search?query=CARD9"},"sequence":{"accession":"Q9H257","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H257.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H257/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H257"}},"corpus_meta":[{"pmid":"27158904","id":"PMC_27158904","title":"CARD9 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Endogenous CARD9 was found constitutively associated with BCL10, indicating a pre-existing signaling complex.\",\n      \"method\": \"Mammalian two-hybrid analysis, co-immunoprecipitation of endogenous proteins, NF-κB reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reciprocal co-IP of endogenous proteins, two-hybrid identification, reporter assay; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"11053425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CARD9 is an essential transducer of Dectin-1 signaling in myeloid cells. CARD9 couples Dectin-1 (an ITAM-related innate receptor for fungal β-glucan/zymosan) to BCL10-MALT1-mediated canonical NF-κB activation, mediating cytokine production and innate anti-fungal immunity. CARD9 is dispensable for TLR/MyD88-induced responses and for antigen receptor signaling that uses CARMA1 as the BCL10-MALT1 linker.\",\n      \"method\": \"Card9−/− mouse generation, zymosan/Dectin-1 stimulation assays, NF-κB reporter assays, cytokine ELISA, genetic reconstitution\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with defined phenotype, genetic epistasis establishing pathway position, replicated across multiple subsequent studies\",\n      \"pmids\": [\"16862125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CARD9 is required for Nod2-mediated activation of p38 and JNK (but not NF-κB) in macrophages responding to intracellular pathogens. CARD9 inducibly associates with both Nod2 and the serine-threonine kinase RICK (RIPK2) after bacterial or viral infection.\",\n      \"method\": \"Card9−/− mouse generation, co-immunoprecipitation of CARD9 with Nod2 and RICK, kinase activation assays (p38, JNK), Listeria monocytogenes infection model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice with defined signaling phenotype plus reciprocal co-IP identifying novel complex; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17187069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CARD9 (not CARMA1/CARD11) is required for NF-κB activation downstream of ITAM-associated receptors (FcRγ and DAP12) on myeloid cells, and for TLR-induced MAPK activation in dendritic cells. CARD9 forms a complex with BCL10 in myeloid cells analogous to the CARMA1-BCL10-MALT1 complex in lymphocytes, establishing cell-type-specific adaptor usage for ITAM signaling.\",\n      \"method\": \"Card9−/−, Card11−/−, Bcl10−/− mouse comparisons; NF-κB activation assays; co-immunoprecipitation; cytokine production assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO mouse strains with defined epistasis, co-IP, replicated by independent group (PMID 17450144)\",\n      \"pmids\": [\"17486093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Dectin-1-Syk-CARD9 signaling induces DC maturation and secretion of IL-6, TNF, and IL-23 (but little IL-12), and is required for CARD9-dependent Th17 responses to Candida albicans infection in vivo.\",\n      \"method\": \"Card9−/− mice, Candida albicans infection model, cytokine ELISA, T cell differentiation assays, dectin-1 agonist adjuvant experiments\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mice with defined in vivo phenotype, multiple cytokine readouts; replicated by multiple labs\",\n      \"pmids\": [\"17450144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RIG-I-mediated NF-κB activation during RNA virus infection requires MAVS and a CARD9-BCL10 complex, establishing CARD9-BCL10 as an essential module downstream of RIG-I for proinflammatory (but not inflammasome) signaling. RIG-I-triggered inflammasome activation proceeds independently of CARD9.\",\n      \"method\": \"Card9−/− and Bcl10−/− cells, RNA virus infection assays, NF-κB reporter assays, IL-1β production measurement, co-immunoprecipitation\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO cells defining pathway position, clear positive and negative results separating two pathways; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19915568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A homozygous Q295X loss-of-function mutation in CARD9 causes autosomal recessive susceptibility to chronic mucocutaneous candidiasis, associated with low Th17 cell numbers. Genetic reconstitution of CARD9-deficient myeloid cells showed the Q295X allele impairs dectin-1-induced innate signaling.\",\n      \"method\": \"Homozygosity mapping, Sanger sequencing, T cell phenotyping, genetic reconstitution of Card9−/− myeloid cells\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics plus functional reconstitution experiment; replicated in many subsequent studies across populations\",\n      \"pmids\": [\"19864672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CARD9 mediates Dectin-2-induced IκBα kinase (IKK) ubiquitination to activate NF-κB in response to C. albicans hyphae, while Syk regulates IKK phosphorylation. Hyphal stimulation specifically induces CARD9 association with BCL10 via Dectin-2 (not Dectin-1).\",\n      \"method\": \"siRNA knockdown of Dectin-1 and Dectin-2, NF-κB reporter assay, co-immunoprecipitation of CARD9-BCL10, ubiquitination assays on IKK\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection with co-IP, ubiquitination assay, and receptor-specific knockdown; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20538615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Protein kinase C-δ (PKCδ) is activated downstream of Dectin-1-Syk signaling and phosphorylates CARD9 at Thr231, which is required for CARD9-BCL10 complex assembly and canonical NF-κB activation. Prkcd−/− but not PKCα-, PKCβ-, or PKCθ-deficient DCs are defective in innate responses to Dectin-1, Dectin-2, and Mincle.\",\n      \"method\": \"Prkcd−/− mice, in vitro kinase assay, CARD9 phosphorylation mapping, co-immunoprecipitation of CARD9-BCL10, Candida albicans infection model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay identifying phosphorylation site, KO mice with defined phenotype, co-IP of complex; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"22265677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CARD9 mediates Dectin-1-induced ERK activation by linking Ras-GRF1 to H-Ras. Syk-dependent phosphorylation of Ras-GRF1 enables it to recruit and activate H-Ras through a complex with CARD9, leading to downstream ERK activation and proinflammatory responses. This ERK pathway is independent of CARD9-mediated NF-κB activation.\",\n      \"method\": \"Co-immunoprecipitation of CARD9-RasGRF1-H-Ras complex, ERK kinase assays, Card9−/− macrophages/DCs, ERK inhibitor in vivo survival experiments\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of trimeric complex, KO cells, in vivo functional validation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"25267792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cytosolic Rad50 directly interacts with CARD9. Transfection of dsDNA or DNA virus infection induces formation of dsDNA-Rad50-CARD9 signaling complexes that activate NF-κB and generate pro-IL-1β. Primary cells lacking Rad50 or CARD9 exhibit defective DNA-induced IL-1β production.\",\n      \"method\": \"Co-immunoprecipitation of endogenous Rad50-CARD9, pulldown assays, dsDNA transfection assay, Card9−/− primary cells and mice, DNA virus infection model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction identified by co-IP, KO cells with defined phenotype, in vivo confirmation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"24777530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The interaction between NOD2 and CARD9 is mediated not by the CARDs of each protein as previously proposed, but by two sites on NOD2: the CARD-NACHT linker region and the NACHT domain itself.\",\n      \"method\": \"Pulldown and co-immunoprecipitation mapping experiments using truncation and domain mutants of NOD2 and CARD9\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — domain-mapping pulldown experiments, single lab, single method type; corrects prior assumption\",\n      \"pmids\": [\"24960071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A hypomorphic CARD9 p.Y91H mutation impairs the ability of CARD9 to complex with RASGRF1, leading to impaired NF-κB and ERK activation in monocytes and defective GM-CSF responses. CARD9-BCL10-MALT1 complex formation is intact in these patients, demonstrating that the CARD9/RASGRF1/ERK/GM-CSF axis is distinct from the CBM complex pathway.\",\n      \"method\": \"Co-immunoprecipitation of CARD9 with RASGRF1 and BCL10/MALT1, NF-κB and ERK activation assays in patient monocytes, clinical GM-CSF rescue\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with patient-derived cells, kinase activation assays, clinical rescue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"26521038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Vav1, Vav2, and Vav3 GEF proteins are key activators of the CARD9 pathway downstream of Dectin-1, Dectin-2, and Mincle, required for NF-κB control and proinflammatory gene transcription. Vav1/2/3−/− mice phenocopy Card9−/− animals with extreme fungal susceptibility.\",\n      \"method\": \"Vav1/2/3 triple-KO mice, NF-κB reporter assays, cytokine production assays, Candida infection models\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice with defined pathway epistasis, multiple CLR stimuli tested, functional phenotype; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27926862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The CARD9 S12N variant (rs4077515) mediates CLR-induced activation of the non-canonical NF-κB subunit RelB, leading to IL-5 production in alveolar macrophages and type 2 immune responses with eosinophil recruitment. Wild-type CARD9 does not activate RelB or induce IL-5 in this context.\",\n      \"method\": \"CARD9S12N knock-in mice, NF-κB subunit activation assays (RelB), IL-5 ELISA, eosinophil recruitment assays, patient PBMC studies\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse model with defined signaling phenotype, patient validation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"29777223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The CARD9 R70W mutation prevents NF-κB activation by blocking productive interactions with BCL10 and MALT1, thereby preventing assembly of the filamentous CARD9-BCL10-MALT1 (CBM) signalosome. Structural analysis maps R70 to the interface between successive CARD domains in CARD9 filaments.\",\n      \"method\": \"Reporter assays, co-immunoprecipitation of CBM complex, confocal imaging of BCL10 filament assemblies, structural analysis of CARD domain interface\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, reporter assay, imaging; single lab, no in vitro reconstitution; structural inference from modeling\",\n      \"pmids\": [\"30429846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cryo-EM structure of the CARD9 filament and crystal structure of an autoinhibited CARD9 fragment (CARD-coiled-coil interface) were determined. Autoinhibition is mediated by an extensive intramolecular interface between the CARD and coiled-coil domains. Disruption of this interface leads to hyperactivation in cells and formation of BCL10-templating filaments in vitro. CARD9 and CARD11 share similar but distinct autoinhibition mechanisms.\",\n      \"method\": \"Cryo-EM structure determination, crystal structure, in vitro filament reconstitution, gain-of-function mutagenesis with NF-κB reporter assays in cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM and crystal structures combined with in vitro reconstitution of filaments and functional mutagenesis; multiple orthogonal methods in single study\",\n      \"pmids\": [\"31296852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CARD9 in microglia promotes IL-1β production (via both transcriptional regulation of Il1b and inflammasome activation) and CXCL1 production in response to CNS Candida infection, driving CXCR2+ neutrophil recruitment. Microglia-specific Card9 deletion impairs IL-1β and CXCL1 production and increases fungal proliferation in the CNS.\",\n      \"method\": \"Microglia-specific Card9 conditional KO mice, IL-1β and CXCL1 ELISA, neutrophil recruitment quantification, CNS Candida infection model, p38 kinase assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with defined mechanistic readouts; replicated in human CARD9-deficient patients\",\n      \"pmids\": [\"30996332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dok3 recruits protein phosphatase 1 (PP1) to dephosphorylate CARD9, dampening downstream NF-κB and JNK activation and antifungal immune responses in neutrophils. Dok3 deficiency enhances phagocytosis, cytokine production, and survival against Candida albicans infection.\",\n      \"method\": \"Dok3−/− mice, co-immunoprecipitation of Dok3-PP1-CARD9, CARD9 phosphorylation assays, NF-κB/JNK activation assays, in vivo Candida infection model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of trimeric complex, phosphorylation assays, KO mice with defined phenotype; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31180338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CARD9 in dendritic cells is required for development of autoimmune disease in Lyn-deficient mice via a CD11b-Syk-PKCδ-CARD9 pathway. In the absence of Lyn, this pathway is amplified, leading to increased TLR-induced production of inflammatory cytokines. Dendritic cell-specific CARD9 deletion reversed autoimmunity and experimental colitis in Lyn-deficient mice.\",\n      \"method\": \"Cell-type-specific (DC-specific) Card9 KO, co-immunoprecipitation, cytokine assays, DSS and IL-10-deficiency colitis models\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined cell-type-specific mechanism, pathway epistasis; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31594855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CARD9 in neutrophils mediates mitochondrial function; loss of CARD9 causes mitochondrial dysfunction with increased reactive oxygen species production and premature neutrophil apoptosis, particularly in oxidative environments. This impaired neutrophil survival reduces tissue fungal containment and increases susceptibility to intestinal inflammation.\",\n      \"method\": \"Neutrophil-specific and epithelial-specific conditional Card9 KO mice, DSS colitis model, Seahorse bioenergetics profiling, apoptosis assays, proteomics, in vivo fungal infection model\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional cell-type-specific KO, bioenergetics profiling (Seahorse), apoptosis assays, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"36167663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CARD9 interacts directly with Rubicon (a negative regulator of autophagy) in cardiomyocytes, and this interaction enhances UVRAG-Beclin1-PI3KC3 interaction and UVRAG-Vps16-mediated Rab7 activation to promote autophagosome formation, maturation, and endocytosis. CARD9 overexpression increases autophagic flux; CARD9 loss impairs autophagy and worsens myocardial I/R injury.\",\n      \"method\": \"Co-immunoprecipitation of CARD9-Rubicon, Rubicon siRNA rescue, LC3 lipidation and p62 assays, autophagy flux assays (BafA1/3-MA), CARD9−/− mice in I/R model\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying novel interaction, rescue experiment with siRNA, KO mice; single lab, multiple but focused methods\",\n      \"pmids\": [\"32248306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CARD9 protects cardiomyocytes from mitochondria-dependent apoptosis by interacting with Apaf-1 via its CARD domain, suppressing caspase-9 activation and apoptosome formation under oxidative stress.\",\n      \"method\": \"Co-immunoprecipitation of CARD9-Apaf-1, CARD domain deletion mutants, caspase-3 and -9 activation assays, CARD9−/− mice in I/R model, TUNEL staining\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping, KO mice; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31212066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"OTUD1 deubiquitinase directly interacts with CARD9 and removes polyubiquitin chains from CARD9, promoting canonical NF-κB and MAPK pathway activation in the context of antifungal immunity. OTUD1 deficiency impairs CARD9-mediated cytokine production and increases fungal susceptibility in vivo.\",\n      \"method\": \"Co-immunoprecipitation of OTUD1-CARD9, deubiquitination assay in vitro, Otud1−/− mice, NF-κB/MAPK activation assays, Candida infection model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct deubiquitination assay plus co-IP and KO mice with in vivo phenotype; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33789983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"OTUD1 removes K33-linked ubiquitin from CARD9 (without affecting CARD9 stability) to promote assembly of the CARD9-BCL10-MALT1 (CBM) complex in macrophages, resulting in NF-κB activation and inflammatory gene expression in the context of isoproterenol-induced cardiac stress.\",\n      \"method\": \"Co-immunoprecipitation of OTUD1-CARD9, ubiquitin linkage-specific deubiquitination assays, CBM complex pull-down, myeloid-specific KO mice, NF-κB reporter assays\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — linkage-specific deubiquitination assay identifying K33-ubiquitin, co-IP, conditional KO mice; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"39118286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Antifungal IgG production by gut commensal fungi depends on CARD9 and CARD9+CX3CR1+ macrophages. In individuals with CARD9 loss-of-function mutations, antifungal IgG responses are impaired, revealing a role for CARD9 in coordinating innate-to-adaptive humoral immunity against mycobiota.\",\n      \"method\": \"Card9−/− mice, fungal colonization models, germinal center B cell analysis, systemic antibody profiling, human patient CARD9 mutation analysis, macrophage-specific functional assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mice plus human patient validation, multiple orthogonal methods including GC analysis and antibody profiling; independently supported by patient data\",\n      \"pmids\": [\"33548172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CARD9 mediates Dectin-3-induced Mincle expression via the CARD9-BCL10-MALT1 complex and NF-κB (but not NFAT) activation. NF-κB binds the Mincle promoter, and CARD9- or Dectin-3-deficient macrophages fail to upregulate Mincle in response to TDM (mycobacterial trehalose 6,6'-dimycolate).\",\n      \"method\": \"Dectin-3−/− and Card9−/− bone marrow-derived macrophages, NF-κB/NFAT reporter assays, chromatin immunoprecipitation of NF-κB at Mincle promoter, cytokine ELISA, immunization experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO macrophages, ChIP at promoter, reporter assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"25202022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CARD9 promotes recovery from colitis partly by enabling the gut microbiota to metabolize tryptophan into aryl hydrocarbon receptor (AHR) ligands, which promote IL-22 production. Transfer of Card9−/− microbiota to germ-free wild-type recipients increases colitis susceptibility, and the Card9−/− microbiota fails to produce AHR ligands from tryptophan.\",\n      \"method\": \"Card9−/− mice, germ-free recipient microbiota transfer, metabolomics (tryptophan metabolites), AHR agonist treatment, Lactobacillus inoculation, IL-22 measurement\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — germ-free transfer experiment establishing causal role, metabolomics, functional rescue; replicated and widely cited\",\n      \"pmids\": [\"27158904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AIRE forms a transient complex with phosphorylated Syk and CARD9 at the cell membrane after Dectin-1 ligation, participating in the Dectin-1 signaling pathway to support TNF-α production. Reducing AIRE expression in THP-1 cells decreases TNF-α release after Dectin-1 ligation.\",\n      \"method\": \"Co-immunoprecipitation of AIRE-pSyk-CARD9, confocal microscopy of AIRE-Dectin-1 co-localization, siRNA knockdown, PBMC stimulation assays from APECED patients\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP identifying complex, confocal localization, siRNA knockdown; single lab, functional link partially demonstrated\",\n      \"pmids\": [\"21962774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CARD9 promotes metastasis-associated macrophage polarization through NF-κB activation. Tumor cell-secreted VEGF activates Syk in macrophages, which is necessary for formation of the CARD9-BCL10-MALT1 complex. Card9−/− bone marrow promotes less liver metastasis of colon carcinoma cells.\",\n      \"method\": \"Card9−/− bone marrow transplantation, co-immunoprecipitation of CARD9-BCL10-MALT1, NF-κB activation assays, VEGF/Syk pathway inhibition, in vivo metastasis model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of CBM complex in tumor context, KO bone marrow transplant, defined pathway; single lab\",\n      \"pmids\": [\"24722209\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CARD9 is a myeloid-enriched cytosolic adaptor that nucleates a CARD9-BCL10-MALT1 (CBM) signalosome filament—held in an autoinhibited CARD–coiled-coil conformation until PKCδ phosphorylates CARD9 at Thr231 (downstream of Syk and Vav GEFs) to trigger BCL10/MALT1 recruitment and canonical NF-κB activation; CARD9 also drives a parallel ERK pathway by linking Ras-GRF1 to H-Ras, activates p38/JNK via Nod2-RICK interactions for intracellular pathogen responses, signals through a Rad50 complex for cytosolic DNA-induced IL-1β, promotes autophagy by sequestering Rubicon and inhibits cardiomyocyte apoptosis by blocking Apaf-1-dependent apoptosome formation; its activity is positively regulated by OTUD1-mediated K33-deubiquitination and negatively regulated by Dok3-recruited PP1-mediated dephosphorylation, while the S12N variant aberrantly activates non-canonical RelB-NF-κB to drive IL-5 and type 2 responses.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CARD9 is a myeloid-enriched cytosolic CARD-coiled-coil adaptor that couples innate pattern-recognition receptors to NF-\\u03baB and MAPK signaling, serving as the central transducer of antifungal immunity [#1, #6]. It selectively binds the CARD of BCL10 through homophilic CARD-CARD interactions and self-associates via coiled-coil motifs to seed a CARD9-BCL10-MALT1 (CBM) signalosome [#0]; cryo-EM and crystallographic analysis show CARD9 is held in an autoinhibited state by an intramolecular CARD-coiled-coil interface whose disruption produces BCL10-templating filaments and hyperactivation [#16]. In myeloid cells CARD9 is the obligate BCL10-MALT1 linker (in place of CARMA1/CARD11) downstream of ITAM-coupled C-type lectin receptors\\u2014Dectin-1, Dectin-2, Dectin-3, and Mincle\\u2014and FcR\\u03b3/DAP12 receptors, where Syk-activated Vav GEFs and PKC\\u03b4 converge on CARD9, the latter phosphorylating Thr231 to license CBM assembly and canonical NF-\\u03baB activation [#3, #8, #13, #26]. This pathway drives proinflammatory and IL-23/Th17 cytokine programs essential for clearing Candida albicans [#4], and germline loss-of-function mutations (Q295X) cause autosomal recessive chronic mucocutaneous candidiasis with deficient Th17 immunity [#6]. CARD9 additionally branches into NF-\\u03baB-independent outputs: it links Ras-GRF1 to H-Ras for ERK activation [#9], cooperates with Nod2/RICK to drive p38 and JNK during intracellular infection [#2], and assembles a cytosolic Rad50 complex for DNA-induced IL-1\\u03b2 [#10]. Its activity is set by post-translational control\\u2014OTUD1-mediated removal of K33-linked ubiquitin promotes CBM assembly [#23, #24], while Dok3-recruited PP1 dephosphorylates CARD9 to dampen signaling [#18]. The S12N variant aberrantly activates non-canonical RelB to produce IL-5 and type 2 responses [#14]. Beyond immune signaling, CARD9 shapes mucosal homeostasis by enabling microbiota tryptophan metabolism into AHR ligands driving IL-22 [#27] and coordinating antifungal IgG responses [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established CARD9's biochemical core: how it nucleates an NF-\\u03baB-activating complex, by showing selective CARD-CARD binding to BCL10 and coiled-coil self-association.\",\n      \"evidence\": \"Mammalian two-hybrid, co-IP of endogenous CARD9-BCL10, NF-\\u03baB reporter assay\",\n      \"pmids\": [\"11053425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological receptor or upstream trigger identified\", \"No structural basis for self-association\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed CARD9 in a pathway by defining it as the essential transducer linking Dectin-1 to BCL10-MALT1 and antifungal NF-\\u03baB, distinct from TLR/MyD88 and CARMA1 routes.\",\n      \"evidence\": \"Card9\\u2212/\\u2212 mice, zymosan/Dectin-1 stimulation, cytokine ELISA, genetic reconstitution\",\n      \"pmids\": [\"16862125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CARD9 activation downstream of receptor not resolved\", \"Cell-type specificity not yet formalized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a parallel CARD9 output by showing it is required for Nod2-mediated p38/JNK (not NF-\\u03baB) activation against intracellular pathogens via inducible Nod2/RICK association.\",\n      \"evidence\": \"Card9\\u2212/\\u2212 mice, co-IP with Nod2 and RICK, p38/JNK kinase assays, Listeria infection\",\n      \"pmids\": [\"17187069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain basis of Nod2 interaction unresolved (later revised)\", \"How CARD9 selectively routes to MAPK vs NF-\\u03baB unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Generalized CARD9 as the myeloid counterpart of CARMA1, required for ITAM (FcR\\u03b3/DAP12)-driven NF-\\u03baB and TLR-induced MAPK, establishing cell-type-specific adaptor usage.\",\n      \"evidence\": \"Card9\\u2212/\\u2212, Card11\\u2212/\\u2212, Bcl10\\u2212/\\u2212 mouse comparisons, co-IP, cytokine assays\",\n      \"pmids\": [\"17486093\", \"17450144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Th17-driving cytokine circuit defined but transcriptional control unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended CARD9-BCL10 module to antiviral signaling, showing it is essential for RIG-I/MAVS-driven proinflammatory NF-\\u03baB but dispensable for inflammasome activation.\",\n      \"evidence\": \"Card9\\u2212/\\u2212 and Bcl10\\u2212/\\u2212 cells, RNA virus infection, NF-\\u03baB and IL-1\\u03b2 readouts, co-IP\",\n      \"pmids\": [\"19915568\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connection between RIG-I/MAVS and CARD9 recruitment not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected CARD9 to human disease, establishing that biallelic Q295X loss-of-function causes chronic mucocutaneous candidiasis with impaired Th17 immunity.\",\n      \"evidence\": \"Homozygosity mapping, Sanger sequencing, T cell phenotyping, reconstitution of Card9\\u2212/\\u2212 myeloid cells\",\n      \"pmids\": [\"19864672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular consequence of Q295X truncation on signalosome not defined at structural level\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Refined receptor specificity by showing Dectin-2/hyphae use CARD9-BCL10 to drive IKK ubiquitination, dissecting it from Syk-driven IKK phosphorylation.\",\n      \"evidence\": \"siRNA knockdown of Dectin-1/2, co-IP, IKK ubiquitination assays, NF-\\u03baB reporter\",\n      \"pmids\": [\"20538615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase mediating IKK modification not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the molecular switch for CBM assembly: PKC\\u03b4 phosphorylates CARD9 at Thr231 downstream of Syk to enable BCL10 recruitment and canonical NF-\\u03baB.\",\n      \"evidence\": \"Prkcd\\u2212/\\u2212 mice, in vitro kinase assay, phosphosite mapping, co-IP, Candida infection\",\n      \"pmids\": [\"22265677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Thr231 phosphorylation relieves autoinhibition not yet structurally explained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined an NF-\\u03baB-independent ERK branch in which CARD9 bridges Syk-phosphorylated Ras-GRF1 to H-Ras for proinflammatory ERK signaling.\",\n      \"evidence\": \"Co-IP of CARD9-RasGRF1-H-Ras, ERK kinase assays, Card9\\u2212/\\u2212 cells, in vivo ERK inhibition\",\n      \"pmids\": [\"25267792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the trimeric complex unresolved\", \"How CARD9 partitions between ERK and CBM outputs unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Uncovered a cytosolic DNA-sensing role: Rad50 directly binds CARD9 to form dsDNA-Rad50-CARD9 complexes generating pro-IL-1\\u03b2.\",\n      \"evidence\": \"Co-IP of endogenous Rad50-CARD9, pulldowns, dsDNA transfection, Card9\\u2212/\\u2212 cells, DNA virus model\",\n      \"pmids\": [\"24777530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Inflammasome coupling downstream of Rad50-CARD9 not fully defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revised the NOD2-CARD9 interaction model, mapping it to the NOD2 CARD-NACHT linker and NACHT domain rather than reciprocal CARDs.\",\n      \"evidence\": \"Pulldown/co-IP domain mapping with NOD2 and CARD9 truncation mutants\",\n      \"pmids\": [\"24960071\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method type (pulldown mapping)\", \"Functional consequence of revised interface not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CARD9 drives transcriptional feed-forward by mediating Dectin-3-induced Mincle expression through CBM/NF-\\u03baB binding at the Mincle promoter.\",\n      \"evidence\": \"Dectin-3\\u2212/\\u2212 and Card9\\u2212/\\u2212 macrophages, ChIP at Mincle promoter, reporter assays\",\n      \"pmids\": [\"25202022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cooperating transcription factors at Mincle locus not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Confirmed the ERK branch in humans by showing the hypomorphic Y91H mutation selectively impairs CARD9-RASGRF1 complex/GM-CSF responses while leaving CBM assembly intact.\",\n      \"evidence\": \"Co-IP of CARD9 with RASGRF1 and BCL10/MALT1, NF-\\u03baB/ERK assays in patient monocytes, clinical GM-CSF rescue\",\n      \"pmids\": [\"26521038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why this axis is uniquely sensitive to Y91H not structurally explained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined upstream GEF activators, showing Vav1/2/3 are required to engage CARD9 across multiple CLRs, with triple-KO phenocopying Card9\\u2212/\\u2212.\",\n      \"evidence\": \"Vav1/2/3 triple-KO mice, NF-\\u03baB reporter and cytokine assays, Candida models\",\n      \"pmids\": [\"27926862\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link from Vav GEFs to CARD9 not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended CARD9 to mucosal homeostasis, demonstrating it enables microbiota tryptophan-to-AHR-ligand metabolism that drives IL-22 and colitis recovery.\",\n      \"evidence\": \"Card9\\u2212/\\u2212 mice, germ-free microbiota transfer, metabolomics, AHR agonist rescue, IL-22 measurement\",\n      \"pmids\": [\"27158904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-intrinsic CARD9 events shaping microbiota composition not fully delineated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a gain-of-function variant: S12N redirects CLR signaling to non-canonical RelB, driving IL-5 and type 2 immunity not seen with wild-type CARD9.\",\n      \"evidence\": \"CARD9 S12N knock-in mice, RelB activation assays, IL-5 ELISA, eosinophil recruitment, patient PBMCs\",\n      \"pmids\": [\"29777223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis by which S12N favors RelB not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked CARD9 filament architecture to disease by showing R70W blocks BCL10/MALT1 interactions and CBM filament assembly at a CARD-CARD interface.\",\n      \"evidence\": \"Reporter assays, CBM co-IP, confocal imaging of BCL10 filaments, structural interface analysis\",\n      \"pmids\": [\"30429846\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution\", \"Interface inference from modeling\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided the structural framework: cryo-EM filament and autoinhibited crystal structures showing CARD-coiled-coil autoinhibition that, when disrupted, templates BCL10 filaments.\",\n      \"evidence\": \"Cryo-EM, crystal structure, in vitro filament reconstitution, gain-of-function mutagenesis with reporter assays\",\n      \"pmids\": [\"31296852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How physiological phosphorylation (Thr231) maps onto autoinhibition release not directly shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined post-translational tuning by phosphatase: Dok3 recruits PP1 to dephosphorylate CARD9 and dampen NF-\\u03baB/JNK and antifungal immunity.\",\n      \"evidence\": \"Dok3\\u2212/\\u2212 mice, co-IP of Dok3-PP1-CARD9, phosphorylation and activation assays, Candida model\",\n      \"pmids\": [\"31180338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target residue(s) dephosphorylated by PP1 not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded CARD9 into tissue-specific and pathological roles: microglial CARD9 drives IL-1\\u03b2/CXCL1 and neutrophil recruitment in CNS candidiasis, and DC CARD9 amplifies autoimmunity in Lyn-deficiency.\",\n      \"evidence\": \"Microglia- and DC-specific conditional Card9 KO mice, cytokine ELISA, colitis/autoimmunity models, p38 assays\",\n      \"pmids\": [\"30996332\", \"31594855\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific differences in CARD9 wiring not mechanistically separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed non-signalosome functions: CARD9 supports neutrophil mitochondrial function/survival and protects cardiomyocytes from apoptosome formation via CARD-domain binding to Apaf-1.\",\n      \"evidence\": \"Conditional Card9 KO mice with Seahorse profiling and apoptosis assays; co-IP of CARD9-Apaf-1 with domain mapping, caspase assays, I/R model\",\n      \"pmids\": [\"36167663\", \"31212066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apaf-1 finding is Medium-confidence single-lab co-IP\", \"Mechanism connecting CARD9 to neutrophil mitochondrial regulation unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified an autophagy-promoting role: CARD9 binds Rubicon in cardiomyocytes to enhance UVRAG-Beclin1-PI3KC3 and Rab7-dependent autophagosome maturation.\",\n      \"evidence\": \"Co-IP of CARD9-Rubicon, Rubicon siRNA rescue, LC3/p62 and autophagy flux assays, Card9\\u2212/\\u2212 I/R model\",\n      \"pmids\": [\"32248306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab co-IP\", \"Whether this is myeloid-relevant or cardiomyocyte-restricted unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established ubiquitin-based positive regulation: OTUD1 directly deubiquitinates CARD9 (removing K33-linked chains) to promote CBM assembly and NF-\\u03baB/MAPK output.\",\n      \"evidence\": \"Co-IP of OTUD1-CARD9, in vitro and linkage-specific deubiquitination assays, Otud1\\u2212/\\u2212 and myeloid-specific KO mice, Candida and cardiac stress models\",\n      \"pmids\": [\"33789983\", \"39118286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase adding K33 chains to CARD9 not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected CARD9 to humoral immunity, showing CARD9+CX3CR1+ macrophages coordinate antifungal IgG against gut mycobiota, impaired in CARD9-deficient patients.\",\n      \"evidence\": \"Card9\\u2212/\\u2212 mice, fungal colonization, germinal center analysis, antibody profiling, human patient validation\",\n      \"pmids\": [\"33548172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling events linking CARD9 to GC/B-cell help not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CARD9's physiological phosphorylation, K33-deubiquitination, and receptor-specific inputs are integrated to release autoinhibition and select among the CBM, ERK, MAPK, and apoptotic/autophagic outputs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of phosphorylated/activated CARD9 in receptor context\", \"Quantitative rules governing output selection unknown\", \"E3 ligase counterpart of OTUD1 unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9, 10]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 26]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 4, 6, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"complexes\": [\n      \"CARD9-BCL10-MALT1 (CBM) signalosome\",\n      \"dsDNA-Rad50-CARD9 complex\"\n    ],\n    \"partners\": [\n      \"BCL10\",\n      \"MALT1\",\n      \"NOD2\",\n      \"RIPK2\",\n      \"RASGRF1\",\n      \"RAD50\",\n      \"OTUD1\",\n      \"APAF1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}