{"gene":"CARD8","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2002,"finding":"CARD8 physically interacts with caspase-1 via its CARD domain and negatively regulates caspase-1-dependent IL-1β generation in THP-1 monocytic cells; CARD8 also binds ICEBERG and pseudo-ICE (other caspase-1 CARD-binding proteins). Additionally, CARD8 negatively regulates NF-κB activation induced by TNF-α stimulation and by ectopically expressed RICK, and stable CARD8 expression sensitizes U937/THP-1 cells to differentiation-induced apoptosis.","method":"Co-immunoprecipitation, overexpression in THP-1/U937 cells with IL-1β ELISA readout, NF-κB reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding confirmed, multiple orthogonal functional readouts, replicated across cell lines","pmids":["11821383"],"is_preprint":false},{"year":2001,"finding":"CARDINAL (CARD8) potently suppresses NF-κB activation downstream of multiple stimuli (TRAIL-R1, TRAIL-R2, RIP, RICK, Bcl10, TRADD, IL-1, TNF) and co-immunoprecipitates with IKKγ (NEMO), the regulatory subunit of the IκB kinase complex, providing a molecular basis for its NF-κB inhibitory function.","method":"Co-immunoprecipitation, NF-κB reporter assays with overexpression of multiple upstream activators","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with NEMO, multiple NF-κB pathway nodes tested, strong functional data","pmids":["11551959"],"is_preprint":false},{"year":2001,"finding":"TUCAN (CARD8) CARD domain selectively binds itself and procaspase-9, interferes with Apaf1 binding to procaspase-9, and suppresses caspase activation induced by Apaf1/caspase-9-dependent stimuli (Bax, VP16, staurosporine) but not by Apaf1/caspase-9-independent stimuli (Fas, granzyme B).","method":"Pulldown/binding assays, stable transfection with caspase activity assays, apoptosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro binding plus functional specificity, single lab","pmids":["11408476"],"is_preprint":false},{"year":2002,"finding":"TUCAN/CARDINAL associates with DRAL (a p53-responsive apoptosis-inducing protein), and while CARD8 suppresses NF-κB activity, DRAL enhances it, suggesting they participate in a regulatory mechanism coordinating NF-κB-controlled cellular responses.","method":"Co-immunoprecipitation, NF-κB reporter assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP with functional reporter assay, single lab","pmids":["12067710"],"is_preprint":false},{"year":2011,"finding":"CARD8 and NLRP1 undergo autoproteolytic cleavage at a conserved SF/S motif within the FIIND domain. Bioinformatics and computational modeling revealed structural similarity between FIIND and the ZU5-UPA domain of PIDD. Site-directed mutagenesis showed the second serine of the SF/S motif is required for autoproteolysis; conserved glutamic acid and histidine residues near the cleavage site regulate autoprocessing efficiency.","method":"Site-directed mutagenesis, biochemical cleavage assays, bioinformatics/computational modeling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of active site residues with biochemical validation of cleavage, structural modeling","pmids":["22087307"],"is_preprint":false},{"year":2010,"finding":"CARD8 physically interacts with NOD2 and inhibits nodosome assembly and subsequent NOD2-mediated signaling upon muramyl-dipeptide stimulation in intestinal epithelial cells; CARD8 also inhibits the direct bactericidal effect of NOD2 against intracellular Listeria monocytogenes.","method":"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, intracellular bacterial killing assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — Co-IP plus functional KD with multiple readouts, mechanistic epistasis established","pmids":["20385562"],"is_preprint":false},{"year":2017,"finding":"A frameshift variant in CARD8 (CARD8-FS) produces a truncated protein lacking FIIND and CARD domains that loses the ability to interact with the NOD domain of NLRP3, linking CARD8's NLRP3-binding function to autoinflammation regulation in PFAPA syndrome patients.","method":"Next-generation sequencing, co-immunoprecipitation (CARD8 vs. NLRP3), functional comparison of wild-type vs. truncated protein","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with disease-associated variant, single lab","pmids":["28137891"],"is_preprint":false},{"year":2018,"finding":"A missense mutation (V44I) in the T60 isoform of CARD8 prevents binding to NLRP3 and inhibition of NLRP3 oligomerization, leading to NLRP3 inflammasome hyperactivation and Crohn's disease. The mutant T60 CARD8 exerts a dominant-negative effect by forming oligomers with wild-type T60 or T48 CARD8 that impede their NLRP3 binding. Wild-type CARD8 prevents NLRP3 deubiquitination and serine dephosphorylation.","method":"Whole exome sequencing, immunoblot, Co-immunoprecipitation, monocyte IL-1β stimulation, inflammasome activation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including Co-IP, PTM analysis, dominant-negative mechanistic dissection, patient cells","pmids":["29408806"],"is_preprint":false},{"year":2019,"finding":"DPP9's catalytic enzymatic activity—not its direct protein binding to CARD8—restrains the CARD8 inflammasome. Unlike the DPP9-NLRP1 interaction, the DPP9-CARD8 protein interaction is not disrupted by DPP9 inhibitors or CARD8 autoproteolysis-blocking mutations; wild-type but not catalytically inactive DPP9 rescues CARD8-mediated cell death in DPP9 KO cells.","method":"Activity-based probes, reconstituted inflammasome assays, mass spectrometry proteomics, DPP9 KO cells with rescue experiments","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted assay, catalytic mutant rescue, MS proteomics, mechanistic distinction from NLRP1","pmids":["31525884"],"is_preprint":false},{"year":2020,"finding":"DPP8/9 inhibition activates a proteasomal degradation pathway targeting the disordered N-terminal region (~160 amino acids) of CARD8 for destruction, freeing the C-terminal fragment (UPA-CARD) from autoinhibition to activate caspase-1 and induce pyroptosis. The disordered N-terminal region is the critical signal recognized by this degradation pathway.","method":"Genetic dissection (CRISPR KO), domain deletion mutants, proteasome inhibitors, cell death assays (LDH, PI staining), caspase-1 activity","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological tools, defined domain requirement, strong mechanistic conclusion","pmids":["33053349"],"is_preprint":false},{"year":2020,"finding":"CARD8 inflammasome activation in primary human CD4+ and CD8+ T cells (resting but not activated) triggers pyroptosis via the CARD8-caspase-1-GSDMD axis in response to DPP8/9 inhibition; DPP9 is the relevant DPP restraining CARD8 in T cells.","method":"CRISPR/RNAi genetic dissection of pathway components in primary T cells, morphological and biochemical pyroptosis assays, DPP isoform-specific knockdown","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — genetic pathway dissection in primary cells with multiple orthogonal readouts, DPP9 specificity established","pmids":["32840892"],"is_preprint":false},{"year":2020,"finding":"DPP8/9 inhibitors activate the CARD8 inflammasome (not NLRP1) to induce pyroptosis in resting human and rodent CD4+ and CD8+ T lymphocytes; activated T cells are completely resistant despite expressing CARD8 pathway components.","method":"Pharmacological inhibitors, genetic validation (CARD8 KO), pyroptosis assays in primary lymphocyte subsets","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — genetic KO validation plus pharmacological approach, cell-state specificity defined","pmids":["32796818"],"is_preprint":false},{"year":2021,"finding":"CARD8 senses HIV-1 protease activity as an inflammasome trigger. Premature intracellular activation of viral protease triggered CARD8 inflammasome-mediated pyroptosis of HIV-1-infected cells. Protease activity (not other viral components) is the CARD8-sensed signal.","method":"HIV protease activation system, CARD8 KO/knockdown in CD4+ T cells, pyroptosis assays, patient latent HIV reactivation model","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — genetic KO, protease-specific activation, patient cell validation, multiple readouts","pmids":["33542150"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of CARD8-CT assembly reveal that CARD8 CARD forms a central helical filament promoted by surrounding oligomerized UPA subdomains; UPA reduces the threshold for CARD8-CT filament formation and signaling. Structural analyses show CARD8-CT directly recruits caspase-1 (contrasting with NLRP1-CT which recruits ASC). CARD8 and NLRP1 use distinct CARD surfaces to achieve signaling specificity.","method":"Cryo-EM structure determination (3.7 Å), biochemical oligomerization assays, cellular speck formation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure plus biochemical and cellular functional validation","pmids":["33420033"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of NLRP1 and CARD8 FIINDUPA-CARD reveal distinct inflammasome architectures: NLRP1 forms a two-layered filament with CARD core surrounded by FIINDUPA, while CARD8 forms distinct oligomers. CARD8-CARD filaments enable direct caspase-1 recruitment without ASC, whereas NLRP1-CARD recruits ASC. NLRP1 and CARD8 discriminate between ASC and pro-caspase-1 through unique structural features.","method":"Cryo-EM structure determination (3.7 Å), recombinant protein reconstitution, ASC speck formation in cultured cells, in vitro oligomerization","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures with biochemical and cellular functional validation, two independent groups","pmids":["33420028"],"is_preprint":false},{"year":2022,"finding":"The core 20S proteasome (ubiquitin-independent) controls CARD8 inflammasome activation by degrading the disordered NT region. In unstressed cells, 20S proteasome degrades only the NT disordered region, leaving ZU5-UPA-CARD as an inflammasome inhibitor. In Val-boroPro-stressed cells, the entire NT fragment (including the folded ZU5 domain) is degraded, possibly due to ZU5 unfolding, freeing the CT fragment.","method":"Proteasome inhibitor experiments, 20S-specific activators/inhibitors, domain-specific degradation assays, cell death assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — pharmacological and genetic dissection of 20S-specific pathway, mechanistic model with domain-level resolution","pmids":["35580636"],"is_preprint":false},{"year":2022,"finding":"M24B aminopeptidase inhibitor CQ31 selectively activates CARD8 (not NLRP1) by inhibiting PEPD and XPNPEP1, leading to accumulation of proline-containing peptides that inhibit DPP8/9. These proline-containing peptides do not disrupt the DPP9-NLRP1 active-site interaction (unlike VbP), explaining CARD8 selectivity.","method":"Small molecule screening, biochemical aminopeptidase activity assays, CARD8/NLRP1 inflammasome activation assays, MS-based identification of accumulated peptides","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1-2 — mechanistic dissection with reconstituted biochemistry and cell-based assays, novel tool compound identified","pmids":["35165443"],"is_preprint":false},{"year":2022,"finding":"CARD8 inflammasome is activated in human endothelial cells and cardiomyocytes by Enterovirus Coxsackievirus B3 (CVB3) 2A and 3C viral protease cleavage of CARD8 at p.G38 in a proteasome-dependent manner; CARD8 genetic deletion attenuates CVB3-induced pyroptosis, inflammation, and viral propagation in endothelial cells and cardiomyocytes.","method":"CARD8 KO (CRISPR), protease cleavage site mapping (p.G38), proteasome inhibition, CVB3 infection model, co-culture system","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple functional readouts, cleavage site mapped, multi-cell-type validation","pmids":["36129453"],"is_preprint":false},{"year":2023,"finding":"Coronavirus 3CL protease (3CLpro), including SARS-CoV-2, cleaves a rapidly evolving region of human CARD8 to activate an inflammasome response; CARD8 is required for cell death and pro-inflammatory cytokine release during SARS-CoV-2 infection. A human SNP reduces CARD8 sensing of coronavirus 3CLpros but enables sensing of picornavirus 3C proteases (3Cpro), revealing CARD8 as a broad viral protease sensor with intraspecies variation.","method":"CARD8 KO cells, viral protease expression, cleavage assays, SARS-CoV-2 infection model, natural variation analysis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO validation in infection model, cleavage site mapping, species diversity analysis","pmids":["37289745"],"is_preprint":false},{"year":2023,"finding":"HIV-1 protease cleaves CARD8 at a specific site within a human-specific motif in the CARD8 N-terminus, inducing pyroptosis and pro-inflammatory cytokine release. CARD8 senses both de novo translated HIV-1 protease and packaged protease released from incoming virions. The HIV-1PR cleavage site arose after human-chimpanzee divergence; chimpanzee CARD8 does not recognize HIV or SIVcpz protease, though SIVcpz can cleave human CARD8.","method":"HIV protease cleavage mapping, CARD8 KO cells, acute infection model, evolutionary sequence analysis, site-specific mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic KO, cleavage site mapping, evolutionary mechanistic analysis, virion-packaged vs. de novo protease dissection","pmids":["37417868"],"is_preprint":false},{"year":2023,"finding":"Protein folding stress agents (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate CARD8 NT fragment degradation but alone do not trigger inflammasome formation because released CT fragments are physically sequestered by DPP9. Both DPP9 protein sequestration disruption and NT degradation must occur simultaneously to allow CT fragment oligomerization into inflammasomes.","method":"Pharmacological agents, biochemical fragment detection, DPP9 binding assays, inflammasome formation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — multiple mechanistic agents, two-signal requirement established biochemically and cellularly","pmids":["36649711"],"is_preprint":false},{"year":2024,"finding":"CARD8 inflammasome is activated immediately after HIV entry by viral protease encapsulated in incoming virions, causing rapid pyroptosis of quiescent CD4+ T cells without productive infection. T cell activation abolishes CARD8 function and increases permissiveness to infection. In humanized mice reconstituted with CARD8-deficient cells, CD4+ depletion is delayed despite high viremia. Natural SIV 'non-pathogenic host' species harbor loss-of-function CARD8 mutations.","method":"CARD8 KO humanized mice, incoming virion protease activation assay, CD4+ T cell depletion tracking, CARD8 sequencing in natural SIV hosts","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO mouse model, mechanistic dissection of virion-packaged protease sensing, multi-species validation","pmids":["38428396"],"is_preprint":false},{"year":2005,"finding":"A novel 54 kDa TUCAN (CARD8) isoform (TUCAN-54) suppresses both caspase-8 and caspase-9 mediated apoptosis; TUCAN-54 physically associates with FADD (Fas-associated death domain protein), unlike the 48 kDa isoform, enabling it to inhibit Fas-induced cell death in addition to the mitochondrial apoptosis pathway.","method":"Stable transfection/siRNA knockdown, caspase activity assays, co-immunoprecipitation (TUCAN-54 vs FADD), cell death assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus functional siRNA rescue, isoform-specific mechanism, single lab","pmids":["16204039"],"is_preprint":false}],"current_model":"CARD8 is a cytosolic pattern recognition receptor that undergoes constitutive autoproteolysis at a conserved SF/S motif within its FIIND/ZU5-UPA domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; the NT fragment (containing a disordered region) is degraded by the 20S ubiquitin-independent proteasome in response to danger signals (including DPP8/9 inhibition, viral protease activity, and protein folding stress), freeing the CT fragment (UPA-CARD) from DPP9-mediated sequestration to oligomerize into a filamentous inflammasome that directly recruits and activates caspase-1, leading to GSDMD-dependent pyroptosis; CARD8 also exerts anti-inflammatory functions by binding and inhibiting NLRP3 (blocking its deubiquitination and dephosphorylation), caspase-1, NOD2, and the IKK complex subunit NEMO to suppress NF-κB activation, and it senses viral protease activities from HIV-1, SARS-CoV-2, and other viruses through site-specific cleavage of a rapidly evolving N-terminal tripwire region."},"narrative":{"teleology":[{"year":2001,"claim":"The first functional studies established that CARD8 is a potent suppressor of NF-κB activation by showing it co-immunoprecipitates with the IKK regulatory subunit NEMO and blocks signaling downstream of multiple NF-κB-activating stimuli, defining its anti-inflammatory role.","evidence":"Co-immunoprecipitation and NF-κB reporter assays with overexpression of multiple pathway activators in cell lines","pmids":["11551959","11408476"],"confidence":"High","gaps":["Endogenous stoichiometry of CARD8-NEMO interaction unknown","No structural basis for NEMO binding","In vivo relevance of NF-κB suppression not tested"]},{"year":2002,"claim":"CARD8 was shown to physically interact with caspase-1 via its CARD domain and suppress caspase-1-dependent IL-1β processing, establishing it as a negative regulator of inflammasome output in addition to NF-κB.","evidence":"Co-immunoprecipitation and IL-1β ELISA in THP-1 monocytic cells with overexpression/knockdown","pmids":["11821383"],"confidence":"High","gaps":["Mechanism by which CARD8 inhibits caspase-1 not resolved","Relationship between caspase-1 inhibition and NF-κB inhibition unclear"]},{"year":2010,"claim":"Discovery that CARD8 interacts with NOD2 and inhibits nodosome assembly expanded CARD8's role to suppression of bacterial peptidoglycan sensing pathways, showing it controls NOD2-mediated NF-κB signaling and intracellular bactericidal function.","evidence":"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, and Listeria killing assay in intestinal epithelial cells","pmids":["20385562"],"confidence":"High","gaps":["Whether CARD8 regulation of NOD2 is direct or scaffold-mediated unknown","Physiological relevance in intestinal inflammation not demonstrated in vivo"]},{"year":2011,"claim":"Identification of FIIND domain autoproteolysis at a conserved SF/S motif revealed that CARD8 (like NLRP1) is post-translationally self-processed, fundamentally reframing its activation mechanism as requiring cleavage-generated fragments rather than simple conformational change.","evidence":"Site-directed mutagenesis of SF/S motif and flanking residues, biochemical cleavage assays, computational ZU5-UPA modeling","pmids":["22087307"],"confidence":"High","gaps":["Functional consequence of autoproteolysis for inflammasome activation not yet tested","Crystal structure of FIIND not determined"]},{"year":2018,"claim":"A missense mutation (V44I) in the CARD8 T60 isoform that abolished NLRP3 binding and caused Crohn's disease established that CARD8 directly restrains NLRP3 inflammasome activation by preventing NLRP3 deubiquitination and dephosphorylation, linking CARD8 loss-of-function to human autoinflammatory disease.","evidence":"Whole exome sequencing, Co-IP, PTM analysis of NLRP3, dominant-negative oligomerization studies, patient monocyte IL-1β assays","pmids":["29408806"],"confidence":"High","gaps":["Direct binding interface between CARD8 and NLRP3 not structurally resolved","Specific phosphatase/DUB regulated by CARD8 unknown"]},{"year":2019,"claim":"Reconstitution experiments demonstrated that DPP9 catalytic activity—not merely DPP9 protein binding—restrains CARD8 inflammasome activation, distinguishing the CARD8-DPP9 regulatory mechanism from the NLRP1-DPP9 interaction.","evidence":"DPP9 KO rescue with catalytic mutant, activity-based probes, MS proteomics in reconstituted inflammasome assays","pmids":["31525884"],"confidence":"High","gaps":["Identity of DPP9 substrate(s) relevant to CARD8 restraint unknown","Physical interface for DPP9-CARD8 not resolved"]},{"year":2020,"claim":"Genetic dissection revealed that DPP8/9 inhibition triggers proteasomal degradation of the disordered CARD8 N-terminal region, freeing the C-terminal UPA-CARD fragment to activate caspase-1 and induce pyroptosis—establishing the 'functional degradation' model of CARD8 inflammasome activation.","evidence":"CRISPR KO, domain deletion mutants, proteasome inhibitors, caspase-1 activity and cell death assays in monocytic cells and primary T cells","pmids":["33053349","32840892","32796818"],"confidence":"High","gaps":["Mechanism by which DPP8/9 inhibition triggers NT degradation not identified","Basis for resistance of activated T cells unknown"]},{"year":2021,"claim":"Cryo-EM structures of the CARD8 CT assembly revealed that UPA oligomerization promotes CARD helical filament formation, and that CARD8-CARD directly recruits caspase-1 using distinct structural surfaces from NLRP1 (which recruits ASC), resolving the signaling architecture of the CARD8 inflammasome.","evidence":"Cryo-EM at 3.7 Å resolution, recombinant protein reconstitution, ASC speck and oligomerization assays","pmids":["33420033","33420028"],"confidence":"High","gaps":["Full-length CARD8 structure not resolved","Transition from DPP9-sequestered to oligomerized state not structurally captured"]},{"year":2021,"claim":"Discovery that HIV-1 protease cleaves the CARD8 N-terminus to trigger inflammasome-mediated pyroptosis of infected CD4+ T cells established CARD8 as a pathogen sensor that detects intracellular viral protease activity as a danger signal.","evidence":"HIV protease activation system, CARD8 KO in CD4+ T cells, pyroptosis assays, patient latent HIV reactivation model","pmids":["33542150"],"confidence":"High","gaps":["Precise cleavage site not mapped in this study","In vivo significance for HIV pathogenesis not yet addressed"]},{"year":2022,"claim":"Mechanistic work showed the 20S proteasome (ubiquitin-independent) specifically degrades the CARD8 NT fragment, and that protein folding stress accelerates NT degradation but requires simultaneous disruption of DPP9-mediated CT sequestration for inflammasome assembly—establishing a two-signal activation model.","evidence":"20S-specific inhibitors/activators, domain-specific degradation assays, DPP9 binding assays, inflammasome formation assays","pmids":["35580636","36649711"],"confidence":"High","gaps":["Structural basis for 20S recognition of CARD8 NT not determined","Whether other E3-independent proteasome substrates use similar mechanism unknown"]},{"year":2022,"claim":"Enterovirus (CVB3) 2A and 3C proteases were shown to cleave CARD8 at G38 to activate inflammasome-dependent pyroptosis in endothelial cells and cardiomyocytes, extending the viral protease tripwire model beyond retroviruses to picornaviruses.","evidence":"CARD8 KO via CRISPR, cleavage site mapping, proteasome inhibition, CVB3 infection model in endothelial cells and cardiomyocytes","pmids":["36129453"],"confidence":"High","gaps":["Relative contribution of 2A vs 3C protease in vivo not resolved","Whether CARD8 activation is protective or pathogenic during myocarditis unclear"]},{"year":2023,"claim":"SARS-CoV-2 3CLpro was identified as a CARD8 activator, and natural human SNPs were found to shift CARD8 specificity between coronavirus and picornavirus proteases, revealing that the CARD8 N-terminal tripwire is a rapidly evolving pathogen sensor with intraspecies functional variation.","evidence":"CARD8 KO cells, viral protease expression, SARS-CoV-2 infection model, natural polymorphism analysis across human populations","pmids":["37289745","37417868"],"confidence":"High","gaps":["How balancing selection shapes CARD8 allele frequency not modeled","Structural basis for protease specificity switching by single SNPs unknown"]},{"year":2024,"claim":"In vivo CARD8 KO humanized mice demonstrated that CARD8-mediated pyroptosis of quiescent CD4+ T cells driven by incoming virion-packaged HIV protease contributes to CD4+ T cell depletion, and natural SIV hosts carrying CARD8 loss-of-function mutations avoid pathogenic T cell depletion, establishing CARD8 as a determinant of HIV/SIV pathogenesis.","evidence":"CARD8-deficient humanized mouse model, incoming virion protease activation assay, CD4+ depletion tracking, CARD8 sequencing in natural SIV host species","pmids":["38428396"],"confidence":"High","gaps":["Whether CARD8 contributes to human elite controller or long-term nonprogressor phenotype unknown","Therapeutic modulation of CARD8 in HIV not tested"]},{"year":null,"claim":"Major unresolved questions include the structural basis of the DPP9-CARD8 sequestration complex, the identity of DPP9 substrates whose accumulation triggers CARD8 NT degradation, the mechanism by which T cell activation abolishes CARD8 inflammasome competence, and whether CARD8's anti-inflammatory functions (NLRP3/NOD2/NF-κB suppression) and pro-inflammatory inflammasome functions are coordinated or context-dependent in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of DPP9-CARD8 complex","DPP9 substrate identity upstream of CARD8 NT degradation unknown","Mechanism of T cell activation-induced CARD8 silencing not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,5,7]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12,17,18,19]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,15,20]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,10,12,13,17,18,21]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,10,11,12,17,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,5,7]}],"complexes":["CARD8 inflammasome","DPP9-CARD8 inhibitory complex"],"partners":["CASP1","DPP9","NLRP3","IKBKG","NOD2","GSDMD","FADD"],"other_free_text":[]},"mechanistic_narrative":"CARD8 is an innate immune sensor and inflammasome-forming protein that integrates danger signals—including viral protease activity, DPP8/9 inhibition, and protein folding stress—to activate caspase-1-dependent pyroptosis. CARD8 undergoes constitutive autoproteolysis at a conserved SF/S motif within its FIIND (ZU5-UPA) domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; the disordered NT region is degraded by the ubiquitin-independent 20S proteasome upon stress, while DPP9 physically sequesters released CT fragments, establishing a two-signal requirement for inflammasome assembly in which both NT degradation and DPP9 sequestration disruption must coincide to allow CT (UPA-CARD) oligomerization into helical filaments that directly recruit and activate caspase-1 without ASC [PMID:22087307, PMID:35580636, PMID:36649711, PMID:33420033]. CARD8 functions as a broad viral protease tripwire: HIV-1, SARS-CoV-2, and enteroviral proteases cleave a rapidly evolving N-terminal region, triggering proteasome-dependent inflammasome activation and pyroptosis of infected cells—a mechanism that in vivo contributes to HIV-induced CD4+ T cell depletion in quiescent lymphocytes [PMID:33542150, PMID:37289745, PMID:36129453, PMID:38428396]. Independently of its inflammasome role, CARD8 exerts anti-inflammatory functions by binding NEMO to suppress NF-κB signaling, interacting with NLRP3 to prevent its deubiquitination and dephosphorylation, and inhibiting NOD2-mediated nodosome assembly [PMID:11551959, PMID:29408806, PMID:20385562]."},"prefetch_data":{"uniprot":{"accession":"Q9Y2G2","full_name":"Caspase recruitment domain-containing protein 8","aliases":["CARD-inhibitor of NF-kappa-B-activating ligand","CARDINAL","Tumor up-regulated CARD-containing antagonist of CASP9","TUCAN"],"length_aa":537,"mass_kda":60.7,"function":"Inflammasome sensor, which mediates inflammasome activation in response to various pathogen-associated signals, leading to subsequent pyroptosis of CD4(+) T-cells and macrophages (PubMed:11408476, PubMed:11821383, PubMed:15030775, PubMed:32051255, PubMed:32840892, PubMed:33542150, PubMed:34019797, PubMed:36357533). Inflammasomes are supramolecular complexes that assemble in the cytosol in response to pathogens and other damage-associated signals and play critical roles in innate immunity and inflammation (PubMed:11408476, PubMed:11821383, PubMed:15030775, PubMed:36357533). Acts as a recognition receptor (PRR): recognizes specific pathogens and other damage-associated signals, such as HIV-1 protease activity or Val-boroPro inhibitor, and mediates CARD8 inflammasome activation (PubMed:32840892, PubMed:33542150, PubMed:36357533). In response to pathogen-associated signals, the N-terminal part of CARD8 is degraded by the proteasome, releasing the cleaved C-terminal part of the protein (Caspase recruitment domain-containing protein 8, C-terminus), which polymerizes to initiate the formation of the inflammasome complex: the CARD8 inflammasome directly recruits pro-caspase-1 (proCASP1) independently of PYCARD/ASC and promotes caspase-1 (CASP1) activation, which subsequently cleaves and activates inflammatory cytokines IL1B and IL18 and gasdermin-D (GSDMD), leading to pyroptosis (PubMed:32051255, PubMed:32840892, PubMed:33053349, PubMed:33542150, PubMed:36357533). Ability to sense HIV-1 protease activity leads to the clearance of latent HIV-1 in patient CD4(+) T-cells after viral reactivation; in contrast, HIV-1 can evade CARD8-sensing when its protease remains inactive in infected cells prior to viral budding (PubMed:33542150). Also acts as a negative regulator of the NLRP3 inflammasome (PubMed:24517500). May also act as an inhibitor of NF-kappa-B activation (PubMed:11551959, PubMed:12067710) Constitutes the precursor of the CARD8 inflammasome, which mediates autoproteolytic processing within the FIIND domain to generate the N-terminal and C-terminal parts, which are associated non-covalently in absence of pathogens and other damage-associated signals Regulatory part that prevents formation of the CARD8 inflammasome: in absence of pathogens and other damage-associated signals, interacts with the C-terminal part of CARD8 (Caspase recruitment domain-containing protein 8, C-terminus), preventing activation of the CARD8 inflammasome (PubMed:33542150). In response to pathogen-associated signals, this part is ubiquitinated by the N-end rule pathway and degraded by the proteasome, releasing the cleaved C-terminal part of the protein, which polymerizes and forms the CARD8 inflammasome (Probable) (PubMed:32558991) Constitutes the active part of the CARD8 inflammasome (PubMed:32840892, PubMed:34019797). In absence of pathogens and other damage-associated signals, interacts with the N-terminal part of CARD8 (Caspase recruitment domain-containing protein 8, N-terminus), preventing activation of the CARD8 inflammasome (PubMed:33542150). In response to pathogen-associated signals, the N-terminal part of CARD8 is degraded by the proteasome, releasing this form, which polymerizes to form the CARD8 inflammasome complex: the CARD8 inflammasome complex then directly recruits pro-caspase-1 (proCASP1) and promotes caspase-1 (CASP1) activation, leading to gasdermin-D (GSDMD) cleavage and subsequent pyroptosis (PubMed:32840892, PubMed:33542150)","subcellular_location":"Inflammasome","url":"https://www.uniprot.org/uniprotkb/Q9Y2G2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CARD8","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/CARD8","total_profiled":1310},"omim":[{"mim_id":"619079","title":"INFLAMMATORY BOWEL DISEASE (CROHN DISEASE) 30; 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study).","date":"2022","source":"Japanese journal of clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35920793","citation_count":15,"is_preprint":false},{"pmid":"33902111","id":"PMC_33902111","title":"Nurr1 repression mediates cardinal features of Parkinson's disease in α-synuclein transgenic mice.","date":"2021","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33902111","citation_count":15,"is_preprint":false},{"pmid":"16652048","id":"PMC_16652048","title":"Evaluation of HIV-1 p24 antigenemia and level of CD8+CD38+ T cells as surrogate markers of HIV-1 RNA viral load in HIV-1-infected patients in Dakar, Senegal.","date":"2006","source":"Journal of acquired immune deficiency syndromes (1999)","url":"https://pubmed.ncbi.nlm.nih.gov/16652048","citation_count":15,"is_preprint":false},{"pmid":"23506543","id":"PMC_23506543","title":"The CARD8 p.C10X mutation associates with a low anti-glycans antibody response in patients with Crohn's 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incontinence.","date":"2018","source":"European journal of obstetrics, gynecology, and reproductive biology","url":"https://pubmed.ncbi.nlm.nih.gov/30388611","citation_count":13,"is_preprint":false},{"pmid":"32848886","id":"PMC_32848886","title":"3-Hydroxykynurenine in Regulation of Drosophila Behavior: The Novel Mechanisms for Cardinal Phenotype Manifestations.","date":"2020","source":"Frontiers in physiology","url":"https://pubmed.ncbi.nlm.nih.gov/32848886","citation_count":13,"is_preprint":false},{"pmid":"38920661","id":"PMC_38920661","title":"CARD8: A Novel Inflammasome Sensor with Well-Known Anti-Inflammatory and Anti-Apoptotic Activity.","date":"2024","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/38920661","citation_count":12,"is_preprint":false},{"pmid":"38743498","id":"PMC_38743498","title":"The long noncoding RNA CARDINAL attenuates cardiac hypertrophy by modulating protein translation.","date":"2024","source":"The Journal of clinical 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Additionally, CARD8 negatively regulates NF-κB activation induced by TNF-α stimulation and by ectopically expressed RICK, and stable CARD8 expression sensitizes U937/THP-1 cells to differentiation-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, overexpression in THP-1/U937 cells with IL-1β ELISA readout, NF-κB reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding confirmed, multiple orthogonal functional readouts, replicated across cell lines\",\n      \"pmids\": [\"11821383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CARDINAL (CARD8) potently suppresses NF-κB activation downstream of multiple stimuli (TRAIL-R1, TRAIL-R2, RIP, RICK, Bcl10, TRADD, IL-1, TNF) and co-immunoprecipitates with IKKγ (NEMO), the regulatory subunit of the IκB kinase complex, providing a molecular basis for its NF-κB inhibitory function.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter assays with overexpression of multiple upstream activators\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with NEMO, multiple NF-κB pathway nodes tested, strong functional data\",\n      \"pmids\": [\"11551959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TUCAN (CARD8) CARD domain selectively binds itself and procaspase-9, interferes with Apaf1 binding to procaspase-9, and suppresses caspase activation induced by Apaf1/caspase-9-dependent stimuli (Bax, VP16, staurosporine) but not by Apaf1/caspase-9-independent stimuli (Fas, granzyme B).\",\n      \"method\": \"Pulldown/binding assays, stable transfection with caspase activity assays, apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding plus functional specificity, single lab\",\n      \"pmids\": [\"11408476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TUCAN/CARDINAL associates with DRAL (a p53-responsive apoptosis-inducing protein), and while CARD8 suppresses NF-κB activity, DRAL enhances it, suggesting they participate in a regulatory mechanism coordinating NF-κB-controlled cellular responses.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP with functional reporter assay, single lab\",\n      \"pmids\": [\"12067710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CARD8 and NLRP1 undergo autoproteolytic cleavage at a conserved SF/S motif within the FIIND domain. Bioinformatics and computational modeling revealed structural similarity between FIIND and the ZU5-UPA domain of PIDD. Site-directed mutagenesis showed the second serine of the SF/S motif is required for autoproteolysis; conserved glutamic acid and histidine residues near the cleavage site regulate autoprocessing efficiency.\",\n      \"method\": \"Site-directed mutagenesis, biochemical cleavage assays, bioinformatics/computational modeling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of active site residues with biochemical validation of cleavage, structural modeling\",\n      \"pmids\": [\"22087307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CARD8 physically interacts with NOD2 and inhibits nodosome assembly and subsequent NOD2-mediated signaling upon muramyl-dipeptide stimulation in intestinal epithelial cells; CARD8 also inhibits the direct bactericidal effect of NOD2 against intracellular Listeria monocytogenes.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, intracellular bacterial killing assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional KD with multiple readouts, mechanistic epistasis established\",\n      \"pmids\": [\"20385562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A frameshift variant in CARD8 (CARD8-FS) produces a truncated protein lacking FIIND and CARD domains that loses the ability to interact with the NOD domain of NLRP3, linking CARD8's NLRP3-binding function to autoinflammation regulation in PFAPA syndrome patients.\",\n      \"method\": \"Next-generation sequencing, co-immunoprecipitation (CARD8 vs. NLRP3), functional comparison of wild-type vs. truncated protein\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with disease-associated variant, single lab\",\n      \"pmids\": [\"28137891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A missense mutation (V44I) in the T60 isoform of CARD8 prevents binding to NLRP3 and inhibition of NLRP3 oligomerization, leading to NLRP3 inflammasome hyperactivation and Crohn's disease. The mutant T60 CARD8 exerts a dominant-negative effect by forming oligomers with wild-type T60 or T48 CARD8 that impede their NLRP3 binding. Wild-type CARD8 prevents NLRP3 deubiquitination and serine dephosphorylation.\",\n      \"method\": \"Whole exome sequencing, immunoblot, Co-immunoprecipitation, monocyte IL-1β stimulation, inflammasome activation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including Co-IP, PTM analysis, dominant-negative mechanistic dissection, patient cells\",\n      \"pmids\": [\"29408806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DPP9's catalytic enzymatic activity—not its direct protein binding to CARD8—restrains the CARD8 inflammasome. Unlike the DPP9-NLRP1 interaction, the DPP9-CARD8 protein interaction is not disrupted by DPP9 inhibitors or CARD8 autoproteolysis-blocking mutations; wild-type but not catalytically inactive DPP9 rescues CARD8-mediated cell death in DPP9 KO cells.\",\n      \"method\": \"Activity-based probes, reconstituted inflammasome assays, mass spectrometry proteomics, DPP9 KO cells with rescue experiments\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted assay, catalytic mutant rescue, MS proteomics, mechanistic distinction from NLRP1\",\n      \"pmids\": [\"31525884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DPP8/9 inhibition activates a proteasomal degradation pathway targeting the disordered N-terminal region (~160 amino acids) of CARD8 for destruction, freeing the C-terminal fragment (UPA-CARD) from autoinhibition to activate caspase-1 and induce pyroptosis. The disordered N-terminal region is the critical signal recognized by this degradation pathway.\",\n      \"method\": \"Genetic dissection (CRISPR KO), domain deletion mutants, proteasome inhibitors, cell death assays (LDH, PI staining), caspase-1 activity\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological tools, defined domain requirement, strong mechanistic conclusion\",\n      \"pmids\": [\"33053349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CARD8 inflammasome activation in primary human CD4+ and CD8+ T cells (resting but not activated) triggers pyroptosis via the CARD8-caspase-1-GSDMD axis in response to DPP8/9 inhibition; DPP9 is the relevant DPP restraining CARD8 in T cells.\",\n      \"method\": \"CRISPR/RNAi genetic dissection of pathway components in primary T cells, morphological and biochemical pyroptosis assays, DPP isoform-specific knockdown\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic pathway dissection in primary cells with multiple orthogonal readouts, DPP9 specificity established\",\n      \"pmids\": [\"32840892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DPP8/9 inhibitors activate the CARD8 inflammasome (not NLRP1) to induce pyroptosis in resting human and rodent CD4+ and CD8+ T lymphocytes; activated T cells are completely resistant despite expressing CARD8 pathway components.\",\n      \"method\": \"Pharmacological inhibitors, genetic validation (CARD8 KO), pyroptosis assays in primary lymphocyte subsets\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO validation plus pharmacological approach, cell-state specificity defined\",\n      \"pmids\": [\"32796818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CARD8 senses HIV-1 protease activity as an inflammasome trigger. Premature intracellular activation of viral protease triggered CARD8 inflammasome-mediated pyroptosis of HIV-1-infected cells. Protease activity (not other viral components) is the CARD8-sensed signal.\",\n      \"method\": \"HIV protease activation system, CARD8 KO/knockdown in CD4+ T cells, pyroptosis assays, patient latent HIV reactivation model\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO, protease-specific activation, patient cell validation, multiple readouts\",\n      \"pmids\": [\"33542150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of CARD8-CT assembly reveal that CARD8 CARD forms a central helical filament promoted by surrounding oligomerized UPA subdomains; UPA reduces the threshold for CARD8-CT filament formation and signaling. Structural analyses show CARD8-CT directly recruits caspase-1 (contrasting with NLRP1-CT which recruits ASC). CARD8 and NLRP1 use distinct CARD surfaces to achieve signaling specificity.\",\n      \"method\": \"Cryo-EM structure determination (3.7 Å), biochemical oligomerization assays, cellular speck formation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure plus biochemical and cellular functional validation\",\n      \"pmids\": [\"33420033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of NLRP1 and CARD8 FIINDUPA-CARD reveal distinct inflammasome architectures: NLRP1 forms a two-layered filament with CARD core surrounded by FIINDUPA, while CARD8 forms distinct oligomers. CARD8-CARD filaments enable direct caspase-1 recruitment without ASC, whereas NLRP1-CARD recruits ASC. NLRP1 and CARD8 discriminate between ASC and pro-caspase-1 through unique structural features.\",\n      \"method\": \"Cryo-EM structure determination (3.7 Å), recombinant protein reconstitution, ASC speck formation in cultured cells, in vitro oligomerization\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures with biochemical and cellular functional validation, two independent groups\",\n      \"pmids\": [\"33420028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The core 20S proteasome (ubiquitin-independent) controls CARD8 inflammasome activation by degrading the disordered NT region. In unstressed cells, 20S proteasome degrades only the NT disordered region, leaving ZU5-UPA-CARD as an inflammasome inhibitor. In Val-boroPro-stressed cells, the entire NT fragment (including the folded ZU5 domain) is degraded, possibly due to ZU5 unfolding, freeing the CT fragment.\",\n      \"method\": \"Proteasome inhibitor experiments, 20S-specific activators/inhibitors, domain-specific degradation assays, cell death assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic dissection of 20S-specific pathway, mechanistic model with domain-level resolution\",\n      \"pmids\": [\"35580636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"M24B aminopeptidase inhibitor CQ31 selectively activates CARD8 (not NLRP1) by inhibiting PEPD and XPNPEP1, leading to accumulation of proline-containing peptides that inhibit DPP8/9. These proline-containing peptides do not disrupt the DPP9-NLRP1 active-site interaction (unlike VbP), explaining CARD8 selectivity.\",\n      \"method\": \"Small molecule screening, biochemical aminopeptidase activity assays, CARD8/NLRP1 inflammasome activation assays, MS-based identification of accumulated peptides\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic dissection with reconstituted biochemistry and cell-based assays, novel tool compound identified\",\n      \"pmids\": [\"35165443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CARD8 inflammasome is activated in human endothelial cells and cardiomyocytes by Enterovirus Coxsackievirus B3 (CVB3) 2A and 3C viral protease cleavage of CARD8 at p.G38 in a proteasome-dependent manner; CARD8 genetic deletion attenuates CVB3-induced pyroptosis, inflammation, and viral propagation in endothelial cells and cardiomyocytes.\",\n      \"method\": \"CARD8 KO (CRISPR), protease cleavage site mapping (p.G38), proteasome inhibition, CVB3 infection model, co-culture system\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple functional readouts, cleavage site mapped, multi-cell-type validation\",\n      \"pmids\": [\"36129453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Coronavirus 3CL protease (3CLpro), including SARS-CoV-2, cleaves a rapidly evolving region of human CARD8 to activate an inflammasome response; CARD8 is required for cell death and pro-inflammatory cytokine release during SARS-CoV-2 infection. A human SNP reduces CARD8 sensing of coronavirus 3CLpros but enables sensing of picornavirus 3C proteases (3Cpro), revealing CARD8 as a broad viral protease sensor with intraspecies variation.\",\n      \"method\": \"CARD8 KO cells, viral protease expression, cleavage assays, SARS-CoV-2 infection model, natural variation analysis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO validation in infection model, cleavage site mapping, species diversity analysis\",\n      \"pmids\": [\"37289745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIV-1 protease cleaves CARD8 at a specific site within a human-specific motif in the CARD8 N-terminus, inducing pyroptosis and pro-inflammatory cytokine release. CARD8 senses both de novo translated HIV-1 protease and packaged protease released from incoming virions. The HIV-1PR cleavage site arose after human-chimpanzee divergence; chimpanzee CARD8 does not recognize HIV or SIVcpz protease, though SIVcpz can cleave human CARD8.\",\n      \"method\": \"HIV protease cleavage mapping, CARD8 KO cells, acute infection model, evolutionary sequence analysis, site-specific mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO, cleavage site mapping, evolutionary mechanistic analysis, virion-packaged vs. de novo protease dissection\",\n      \"pmids\": [\"37417868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Protein folding stress agents (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate CARD8 NT fragment degradation but alone do not trigger inflammasome formation because released CT fragments are physically sequestered by DPP9. Both DPP9 protein sequestration disruption and NT degradation must occur simultaneously to allow CT fragment oligomerization into inflammasomes.\",\n      \"method\": \"Pharmacological agents, biochemical fragment detection, DPP9 binding assays, inflammasome formation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mechanistic agents, two-signal requirement established biochemically and cellularly\",\n      \"pmids\": [\"36649711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CARD8 inflammasome is activated immediately after HIV entry by viral protease encapsulated in incoming virions, causing rapid pyroptosis of quiescent CD4+ T cells without productive infection. T cell activation abolishes CARD8 function and increases permissiveness to infection. In humanized mice reconstituted with CARD8-deficient cells, CD4+ depletion is delayed despite high viremia. Natural SIV 'non-pathogenic host' species harbor loss-of-function CARD8 mutations.\",\n      \"method\": \"CARD8 KO humanized mice, incoming virion protease activation assay, CD4+ T cell depletion tracking, CARD8 sequencing in natural SIV hosts\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO mouse model, mechanistic dissection of virion-packaged protease sensing, multi-species validation\",\n      \"pmids\": [\"38428396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A novel 54 kDa TUCAN (CARD8) isoform (TUCAN-54) suppresses both caspase-8 and caspase-9 mediated apoptosis; TUCAN-54 physically associates with FADD (Fas-associated death domain protein), unlike the 48 kDa isoform, enabling it to inhibit Fas-induced cell death in addition to the mitochondrial apoptosis pathway.\",\n      \"method\": \"Stable transfection/siRNA knockdown, caspase activity assays, co-immunoprecipitation (TUCAN-54 vs FADD), cell death assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus functional siRNA rescue, isoform-specific mechanism, single lab\",\n      \"pmids\": [\"16204039\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CARD8 is a cytosolic pattern recognition receptor that undergoes constitutive autoproteolysis at a conserved SF/S motif within its FIIND/ZU5-UPA domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; the NT fragment (containing a disordered region) is degraded by the 20S ubiquitin-independent proteasome in response to danger signals (including DPP8/9 inhibition, viral protease activity, and protein folding stress), freeing the CT fragment (UPA-CARD) from DPP9-mediated sequestration to oligomerize into a filamentous inflammasome that directly recruits and activates caspase-1, leading to GSDMD-dependent pyroptosis; CARD8 also exerts anti-inflammatory functions by binding and inhibiting NLRP3 (blocking its deubiquitination and dephosphorylation), caspase-1, NOD2, and the IKK complex subunit NEMO to suppress NF-κB activation, and it senses viral protease activities from HIV-1, SARS-CoV-2, and other viruses through site-specific cleavage of a rapidly evolving N-terminal tripwire region.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CARD8 is an innate immune sensor and inflammasome-forming protein that integrates danger signals—including viral protease activity, DPP8/9 inhibition, and protein folding stress—to activate caspase-1-dependent pyroptosis. CARD8 undergoes constitutive autoproteolysis at a conserved SF/S motif within its FIIND (ZU5-UPA) domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; the disordered NT region is degraded by the ubiquitin-independent 20S proteasome upon stress, while DPP9 physically sequesters released CT fragments, establishing a two-signal requirement for inflammasome assembly in which both NT degradation and DPP9 sequestration disruption must coincide to allow CT (UPA-CARD) oligomerization into helical filaments that directly recruit and activate caspase-1 without ASC [PMID:22087307, PMID:35580636, PMID:36649711, PMID:33420033]. CARD8 functions as a broad viral protease tripwire: HIV-1, SARS-CoV-2, and enteroviral proteases cleave a rapidly evolving N-terminal region, triggering proteasome-dependent inflammasome activation and pyroptosis of infected cells—a mechanism that in vivo contributes to HIV-induced CD4+ T cell depletion in quiescent lymphocytes [PMID:33542150, PMID:37289745, PMID:36129453, PMID:38428396]. Independently of its inflammasome role, CARD8 exerts anti-inflammatory functions by binding NEMO to suppress NF-κB signaling, interacting with NLRP3 to prevent its deubiquitination and dephosphorylation, and inhibiting NOD2-mediated nodosome assembly [PMID:11551959, PMID:29408806, PMID:20385562].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"The first functional studies established that CARD8 is a potent suppressor of NF-κB activation by showing it co-immunoprecipitates with the IKK regulatory subunit NEMO and blocks signaling downstream of multiple NF-κB-activating stimuli, defining its anti-inflammatory role.\",\n      \"evidence\": \"Co-immunoprecipitation and NF-κB reporter assays with overexpression of multiple pathway activators in cell lines\",\n      \"pmids\": [\"11551959\", \"11408476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous stoichiometry of CARD8-NEMO interaction unknown\", \"No structural basis for NEMO binding\", \"In vivo relevance of NF-κB suppression not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"CARD8 was shown to physically interact with caspase-1 via its CARD domain and suppress caspase-1-dependent IL-1β processing, establishing it as a negative regulator of inflammasome output in addition to NF-κB.\",\n      \"evidence\": \"Co-immunoprecipitation and IL-1β ELISA in THP-1 monocytic cells with overexpression/knockdown\",\n      \"pmids\": [\"11821383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CARD8 inhibits caspase-1 not resolved\", \"Relationship between caspase-1 inhibition and NF-κB inhibition unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that CARD8 interacts with NOD2 and inhibits nodosome assembly expanded CARD8's role to suppression of bacterial peptidoglycan sensing pathways, showing it controls NOD2-mediated NF-κB signaling and intracellular bactericidal function.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, and Listeria killing assay in intestinal epithelial cells\",\n      \"pmids\": [\"20385562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CARD8 regulation of NOD2 is direct or scaffold-mediated unknown\", \"Physiological relevance in intestinal inflammation not demonstrated in vivo\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of FIIND domain autoproteolysis at a conserved SF/S motif revealed that CARD8 (like NLRP1) is post-translationally self-processed, fundamentally reframing its activation mechanism as requiring cleavage-generated fragments rather than simple conformational change.\",\n      \"evidence\": \"Site-directed mutagenesis of SF/S motif and flanking residues, biochemical cleavage assays, computational ZU5-UPA modeling\",\n      \"pmids\": [\"22087307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of autoproteolysis for inflammasome activation not yet tested\", \"Crystal structure of FIIND not determined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A missense mutation (V44I) in the CARD8 T60 isoform that abolished NLRP3 binding and caused Crohn's disease established that CARD8 directly restrains NLRP3 inflammasome activation by preventing NLRP3 deubiquitination and dephosphorylation, linking CARD8 loss-of-function to human autoinflammatory disease.\",\n      \"evidence\": \"Whole exome sequencing, Co-IP, PTM analysis of NLRP3, dominant-negative oligomerization studies, patient monocyte IL-1β assays\",\n      \"pmids\": [\"29408806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface between CARD8 and NLRP3 not structurally resolved\", \"Specific phosphatase/DUB regulated by CARD8 unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reconstitution experiments demonstrated that DPP9 catalytic activity—not merely DPP9 protein binding—restrains CARD8 inflammasome activation, distinguishing the CARD8-DPP9 regulatory mechanism from the NLRP1-DPP9 interaction.\",\n      \"evidence\": \"DPP9 KO rescue with catalytic mutant, activity-based probes, MS proteomics in reconstituted inflammasome assays\",\n      \"pmids\": [\"31525884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of DPP9 substrate(s) relevant to CARD8 restraint unknown\", \"Physical interface for DPP9-CARD8 not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic dissection revealed that DPP8/9 inhibition triggers proteasomal degradation of the disordered CARD8 N-terminal region, freeing the C-terminal UPA-CARD fragment to activate caspase-1 and induce pyroptosis—establishing the 'functional degradation' model of CARD8 inflammasome activation.\",\n      \"evidence\": \"CRISPR KO, domain deletion mutants, proteasome inhibitors, caspase-1 activity and cell death assays in monocytic cells and primary T cells\",\n      \"pmids\": [\"33053349\", \"32840892\", \"32796818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which DPP8/9 inhibition triggers NT degradation not identified\", \"Basis for resistance of activated T cells unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-EM structures of the CARD8 CT assembly revealed that UPA oligomerization promotes CARD helical filament formation, and that CARD8-CARD directly recruits caspase-1 using distinct structural surfaces from NLRP1 (which recruits ASC), resolving the signaling architecture of the CARD8 inflammasome.\",\n      \"evidence\": \"Cryo-EM at 3.7 Å resolution, recombinant protein reconstitution, ASC speck and oligomerization assays\",\n      \"pmids\": [\"33420033\", \"33420028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length CARD8 structure not resolved\", \"Transition from DPP9-sequestered to oligomerized state not structurally captured\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that HIV-1 protease cleaves the CARD8 N-terminus to trigger inflammasome-mediated pyroptosis of infected CD4+ T cells established CARD8 as a pathogen sensor that detects intracellular viral protease activity as a danger signal.\",\n      \"evidence\": \"HIV protease activation system, CARD8 KO in CD4+ T cells, pyroptosis assays, patient latent HIV reactivation model\",\n      \"pmids\": [\"33542150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise cleavage site not mapped in this study\", \"In vivo significance for HIV pathogenesis not yet addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mechanistic work showed the 20S proteasome (ubiquitin-independent) specifically degrades the CARD8 NT fragment, and that protein folding stress accelerates NT degradation but requires simultaneous disruption of DPP9-mediated CT sequestration for inflammasome assembly—establishing a two-signal activation model.\",\n      \"evidence\": \"20S-specific inhibitors/activators, domain-specific degradation assays, DPP9 binding assays, inflammasome formation assays\",\n      \"pmids\": [\"35580636\", \"36649711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for 20S recognition of CARD8 NT not determined\", \"Whether other E3-independent proteasome substrates use similar mechanism unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Enterovirus (CVB3) 2A and 3C proteases were shown to cleave CARD8 at G38 to activate inflammasome-dependent pyroptosis in endothelial cells and cardiomyocytes, extending the viral protease tripwire model beyond retroviruses to picornaviruses.\",\n      \"evidence\": \"CARD8 KO via CRISPR, cleavage site mapping, proteasome inhibition, CVB3 infection model in endothelial cells and cardiomyocytes\",\n      \"pmids\": [\"36129453\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of 2A vs 3C protease in vivo not resolved\", \"Whether CARD8 activation is protective or pathogenic during myocarditis unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"SARS-CoV-2 3CLpro was identified as a CARD8 activator, and natural human SNPs were found to shift CARD8 specificity between coronavirus and picornavirus proteases, revealing that the CARD8 N-terminal tripwire is a rapidly evolving pathogen sensor with intraspecies functional variation.\",\n      \"evidence\": \"CARD8 KO cells, viral protease expression, SARS-CoV-2 infection model, natural polymorphism analysis across human populations\",\n      \"pmids\": [\"37289745\", \"37417868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How balancing selection shapes CARD8 allele frequency not modeled\", \"Structural basis for protease specificity switching by single SNPs unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"In vivo CARD8 KO humanized mice demonstrated that CARD8-mediated pyroptosis of quiescent CD4+ T cells driven by incoming virion-packaged HIV protease contributes to CD4+ T cell depletion, and natural SIV hosts carrying CARD8 loss-of-function mutations avoid pathogenic T cell depletion, establishing CARD8 as a determinant of HIV/SIV pathogenesis.\",\n      \"evidence\": \"CARD8-deficient humanized mouse model, incoming virion protease activation assay, CD4+ depletion tracking, CARD8 sequencing in natural SIV host species\",\n      \"pmids\": [\"38428396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CARD8 contributes to human elite controller or long-term nonprogressor phenotype unknown\", \"Therapeutic modulation of CARD8 in HIV not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include the structural basis of the DPP9-CARD8 sequestration complex, the identity of DPP9 substrates whose accumulation triggers CARD8 NT degradation, the mechanism by which T cell activation abolishes CARD8 inflammasome competence, and whether CARD8's anti-inflammatory functions (NLRP3/NOD2/NF-κB suppression) and pro-inflammatory inflammasome functions are coordinated or context-dependent in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of DPP9-CARD8 complex\", \"DPP9 substrate identity upstream of CARD8 NT degradation unknown\", \"Mechanism of T cell activation-induced CARD8 silencing not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 5, 7]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12, 17, 18, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 15, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 10, 12, 13, 17, 18, 21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 10, 11, 12, 17, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 5, 7]}\n    ],\n    \"complexes\": [\n      \"CARD8 inflammasome\",\n      \"DPP9-CARD8 inhibitory complex\"\n    ],\n    \"partners\": [\n      \"CASP1\",\n      \"DPP9\",\n      \"NLRP3\",\n      \"IKBKG\",\n      \"NOD2\",\n      \"GSDMD\",\n      \"FADD\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}