{"gene":"CARD8","run_date":"2026-06-09T22:57:17","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, two other negative regulators of caspase-1.","method":"Co-immunoprecipitation, overexpression in THP-1/U937 cells, ELISA for IL-1β","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays plus functional IL-1β readout in monocytic cells, single lab","pmids":["11821383"],"is_preprint":false},{"year":2001,"finding":"CARD8 (TUCAN) CARD domain selectively binds procaspase-9 and interferes with Apaf-1–procaspase-9 interaction, suppressing caspase activation induced by cytochrome c/Apaf-1-dependent stimuli (Bax, VP16, staurosporine) but not Apaf-1-independent stimuli (Fas, granzyme B).","method":"Co-immunoprecipitation, stable/transient transfection, caspase activity assays, apoptosis assays","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays (binding + caspase activity + cell death) in a single lab study","pmids":["11408476"],"is_preprint":false},{"year":2002,"finding":"CARD8 (TUCAN/CARDINAL) associates with DRAL and suppresses NF-κB activation; DRAL expression enhances NF-κB activity, suggesting DRAL and CARD8 participate in a common regulatory pathway controlling NF-κB.","method":"Co-immunoprecipitation, NF-κB reporter assay, overexpression","journal":"FEBS Letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP plus functional NF-κB reporter, single lab","pmids":["12067710"],"is_preprint":false},{"year":2005,"finding":"A novel 54 kDa TUCAN isoform (TUCAN-54) suppresses both caspase-8 and caspase-9 activation; TUCAN-54 physically associates with Fas-associated death domain (FADD) — an interaction not seen with 48 kDa TUCAN — thereby inhibiting Fas-induced cell death in addition to mitochondrial pathway apoptosis.","method":"Co-immunoprecipitation, gene transfection/siRNA, caspase activity assays, cell death assays","journal":"Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — binding assay plus loss-of-function (siRNA) and gain-of-function with specific phenotypic readouts, single lab","pmids":["16204039"],"is_preprint":false},{"year":2010,"finding":"CARD8 physically interacts with NOD2 and inhibits nodosome assembly and downstream NF-κB signaling upon muramyl-dipeptide (MDP) stimulation; CARD8 also inhibits the direct bactericidal effect of NOD2 against intracellular Listeria monocytogenes infection.","method":"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assay, intracellular bacterial killing assay in intestinal epithelial cells","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown with two orthogonal phenotypic readouts (NF-κB signaling and bactericidal activity), single lab","pmids":["20385562"],"is_preprint":false},{"year":2011,"finding":"CARD8 and NLRP1 undergo autoproteolytic cleavage at a conserved SF/S motif within their FIIND domain; site-directed mutagenesis showed the second serine of this motif is required for autoproteolysis, and conserved glutamic acid and histidine residues near the cleavage site regulate processing efficiency. Structural modeling identified FIIND as a ZU5-UPA domain.","method":"Site-directed mutagenesis, immunoblot detection of cleavage products, bioinformatics/structural modeling","journal":"PLoS One","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of active-site residues with direct biochemical readout of autoproteolysis, plus structural modeling supporting mechanism","pmids":["22087307"],"is_preprint":false},{"year":2014,"finding":"CARD8 interacts with wild-type NLRP3 but not with CAPS-associated mutant forms of NLRP3; CARD8 significantly reduces IL-1β secretion driven by wild-type NLRP3 but not mutant NLRP3; endogenous CARD8–NLRP3 association was confirmed in resting PBMCs; CARD8 knockdown increased IL-1β secretion from human macrophages.","method":"Co-immunoprecipitation (HEK293 and primary PBMCs), ELISA for IL-1β, siRNA knockdown in human monocyte-derived macrophages","journal":"Arthritis Research & Therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP in both overexpression and endogenous settings, plus loss-of-function in primary human cells with cytokine readout","pmids":["24517500"],"is_preprint":false},{"year":2017,"finding":"A CARD8 frameshift variant (CARD8-FS) produces a truncated protein lacking the FIIND and CARD domains; this truncated protein fails to interact with the NOD domain of NLRP3, demonstrating that the FIIND/CARD region of CARD8 is required for NLRP3 binding and inflammasome inhibition.","method":"Next-generation sequencing, immunoprecipitation/binding assay, domain truncation analysis","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay with domain-deletion mutant establishing structural requirement, single lab","pmids":["28137891"],"is_preprint":false},{"year":2018,"finding":"A V44I missense mutation in the T60 isoform of CARD8 prevents its binding to NLRP3 and inhibition of NLRP3 oligomerization; mutant T60 CARD8 also exerts a dominant-negative effect by forming oligomers with wild-type T60 and T48 CARD8 that prevent their NLRP3 binding. Intact CARD8 prevents NLRP3 deubiquitination and serine dephosphorylation.","method":"Whole exome sequencing, immunoprecipitation, immunoblot for NLRP3 oligomerization and post-translational modifications, patient monocyte functional assays (IL-1β ELISA)","journal":"The Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding assay, dominant-negative oligomerization, PTM analysis, patient cell functional data) establishing mechanism","pmids":["29408806"],"is_preprint":false},{"year":2019,"finding":"DPP9 binds directly to CARD8 but, unlike DPP9–NLRP1, the DPP9–CARD8 interaction is not disrupted by DPP8/9 inhibitors or by CARD8 mutations that block autoproteolysis; catalytically inactive DPP9 fails to rescue CARD8-mediated cell death in DPP9 knockout cells, demonstrating that DPP9's enzymatic activity (not merely its binding to CARD8) restrains the CARD8 inflammasome.","method":"Activity-based probes, reconstituted inflammasome cell-death assays, mass spectrometry proteomics, DPP9 knockout cells","journal":"ACS Chemical Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted assay plus catalytic mutant rescue experiment establishing enzymatic mechanism, single lab with multiple orthogonal methods","pmids":["31525884"],"is_preprint":false},{"year":2020,"finding":"DPP8/9 inhibitor Val-boroPro triggers CARD8 inflammasome-dependent pyroptosis in primary human resting CD4+ and CD8+ T cells via the CARD8–caspase-1–GSDMD axis; DPP9 is the relevant DPP restraining CARD8 activation in T cells. Activated T cells are resistant despite expressing all required components.","method":"Genetic dissection in primary T cells (CRISPR/siRNA knockdown of CARD8, caspase-1, GSDMD), cell death morphology/biochemistry, immunoblot","journal":"The EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function of multiple pathway components in primary human T cells with defined pyroptosis phenotype, confirmed by morphological and biochemical hallmarks","pmids":["32840892"],"is_preprint":false},{"year":2020,"finding":"DPP8/9 inhibitors activate CARD8-mediated pyroptosis in resting human and rodent lymphocytes (CD4+ and CD8+ T cells); species-specific variation in T cell sensitivity is observed.","method":"Pharmacological inhibition, genetic validation (CARD8 knockdown), cell viability assays across species","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown confirming CARD8 requirement in T cells, independently corroborating EMBO Journal findings, single lab","pmids":["32796818"],"is_preprint":false},{"year":2020,"finding":"DPP8/9 inhibition activates a proteasomal degradation pathway targeting CARD8's N-terminal disordered region (~160 amino acids); degradation of the N-terminal fragment frees the C-terminal fragment to activate caspase-1 and induce pyroptosis. CARD8 thus serves as a sensor of activation of a degradation pathway for disordered/misfolded proteins.","method":"Domain mapping/deletion analysis, proteasome inhibition, cell death assays, immunoblot for fragment degradation","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure–function mutagenesis plus proteasome inhibition with direct biochemical readout, multiple orthogonal methods in single study","pmids":["33053349"],"is_preprint":false},{"year":2021,"finding":"CARD8 senses HIV-1 protease activity; premature intracellular activation of the viral protease triggers CARD8 inflammasome-mediated pyroptosis of HIV-1-infected cells, enabling clearance of latent HIV-1 in patient CD4+ T cells after viral reactivation.","method":"CRISPR knockout of CARD8, pharmacological HIV protease activation, cell death assays, patient CD4+ T cell latency clearance model","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — CARD8 genetic knockout with mechanistic protease-activity requirement, validated in patient primary cells with latency model, replicated across experimental systems","pmids":["33542150"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of CARD8-CARD filaments (3.7 Å) reveal that CARD8-CT (UPA+CARD) self-oligomerizes to form helical filaments; CARD8 directly recruits pro-caspase-1 (not ASC) via unique CARD–CARD interactions, distinguishing CARD8 from NLRP1 which requires ASC. The UPA subdomain lowers the threshold for CARD filament formation.","method":"Cryo-EM structure determination, biochemical reconstitution, cell-based ASC speck/caspase-1 recruitment assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic cryo-EM structure with biochemical and cell-based validation of CARD8-specific caspase-1 recruitment mechanism, two independent studies (PMIDs 33420028 and 33420033)","pmids":["33420028","33420033"],"is_preprint":false},{"year":2022,"finding":"The core 20S proteasome (ubiquitin-independent) degrades the disordered N-terminal region of CARD8; in unstimulated cells, partial degradation of the disordered region leaves a folded ZU5/UPA/CARD inhibitory fragment, but Val-boroPro stress causes complete NT degradation (possibly via ZU5 unfolding), releasing the CT fragment to activate the inflammasome.","method":"Proteasome subunit knockdown, 20S proteasome inhibitors, immunoblot of CARD8 fragments, cell death assays, domain mutants","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted proteasome-degradation mechanism with multiple domain mutants and inhibitor experiments, mechanistic detail beyond prior work","pmids":["35580636"],"is_preprint":false},{"year":2022,"finding":"M24B aminopeptidases prolidase (PEPD) and XPNPEP1 are upstream regulators of CARD8; their inhibition by CQ31 leads to accumulation of proline-containing peptides that inhibit DPP8/9, selectively activating CARD8 but not NLRP1 (because NLRP1 directly contacts DPP8/9's active site and proline peptides cannot disrupt this).","method":"Chemical biology (selective inhibitor CQ31), DPP8/9 activity assays, mass spectrometry for peptide accumulation, CARD8/NLRP1 cell death assays, genetic knockouts","journal":"Nature Chemical Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mechanistic pathway reconstituted from upstream enzyme inhibition through peptide accumulation to selective CARD8 activation, with genetic validation","pmids":["35165443"],"is_preprint":false},{"year":2022,"finding":"CARD8 inflammasome is activated in human endothelial cells and cardiomyocytes by Coxsackievirus B3 (CVB3) 2A and 3C proteases cleaving CARD8 at p.G38; CARD8 genetic deletion in endothelial cells and cardiomyocytes attenuates CVB3-induced pyroptosis, inflammation, and viral propagation.","method":"CRISPR knockout of CARD8 in endothelial cells and hESC-derived cardiomyocytes, protease cleavage site mapping, cell death assays, viral propagation assay, co-culture system","journal":"The Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout with specific cleavage site identification in multiple cardiovascular cell types with defined mechanistic and virological phenotypes","pmids":["36129453"],"is_preprint":false},{"year":2023,"finding":"SARS-CoV-2 and diverse coronaviruses 3CL protease cleaves a rapidly evolving region of human CARD8, activating a robust inflammasome response; CARD8 is required for cell death and pro-inflammatory cytokine release during SARS-CoV-2 infection. Natural variation in this 'tripwire' region alters species-specific sensing (e.g., 3CLpro antagonizes rather than activates megabat CARD8), and a human SNP reduces CARD8 sensing of coronavirus 3CLpros while enabling sensing of select picornavirus 3C proteases.","method":"CRISPR knockout, protease cleavage assays, inflammasome activation assays, comparative evolutionary analysis, SNP functional characterization","journal":"PLoS Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout confirming CARD8 requirement, direct cleavage site mapping, cross-species natural variation experiments, multiple orthogonal methods","pmids":["37289745"],"is_preprint":false},{"year":2023,"finding":"HIV-1 protease cleaves the CARD8 N-terminus at a site unique to humans (arising after the human–chimpanzee divergence); cleavage by both de novo translated HIV-1 protease and packaged virion-associated protease activates CARD8 pyroptosis. TLR stimulation prior to infection modulates the magnitude of CARD8-induced pyroptosis. SIVcpz cleaves human CARD8 despite not activating chimpanzee CARD8, suggesting SIVcpz was poised to activate human CARD8 before cross-species transmission.","method":"Protease cleavage site mapping, CARD8 knockout/knockin, evolutionary sequence analysis, cell death assays with packaged vs. de novo HIV protease","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct cleavage site identification, genetic knockout, multiple viral conditions, evolutionary mechanistic analysis","pmids":["37417868"],"is_preprint":false},{"year":2023,"finding":"Several agents that cause protein folding stress (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate CARD8 N-terminal fragment degradation; however, the released C-terminal fragments are sequestered by DPP9, and DPP9-binding ligands must additionally be present to disrupt DPP9–CARD8 CT complexes and allow CT oligomerization into active inflammasomes.","method":"Immunoblot of NT/CT fragment levels, pharmacological stress agents, DPP9 binding assays, cell death assays","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple stress agent classes tested with biochemical and functional readouts; DPP9 sequestration of CT fragment mechanistically established, single lab","pmids":["36649711"],"is_preprint":false},{"year":2024,"finding":"The CARD8 inflammasome is activated immediately after HIV entry by viral protease activity from incoming virions (before de novo viral replication); CARD8 sensing leads to pyroptosis of quiescent CD4+ T cells without productive infection, while T cell activation abolishes CARD8 function and increases permissiveness to infection. In humanized mice reconstituted with CARD8-deficient cells, CD4+ T cell depletion is delayed despite high viremia. 'Natural host' sooty mangabeys harbor loss-of-function CARD8 mutations, potentially explaining non-pathogenic SIV infection.","method":"CARD8 knockout humanized mice, primary CD4+ T cell assays, HIV entry experiments with protease inhibitors, CARD8 sequencing in non-human primates, cell death assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout in humanized animal model with in vivo CD4+ depletion phenotype, mechanistic protease-activity requirement, and cross-species evolutionary validation","pmids":["38428396"],"is_preprint":false},{"year":2006,"finding":"TUCAN (CARD8) interactions with procaspase-9 could not be demonstrated by co-immunoprecipitation or other protein interaction assays in NSCLC cells; siRNA-mediated knockdown of TUCAN did not restore cisplatin-induced caspase-9 activation or affect cisplatin sensitivity, indicating TUCAN does not inhibit procaspase-9 in this cellular context (NEGATIVE RESULT).","method":"Co-immunoprecipitation, siRNA knockdown, caspase-9 activity assay, cell viability assay","journal":"BMC Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple negative experimental approaches (binding assays + loss-of-function) in NSCLC cells, single lab; contradicts earlier pulldown data from TUCAN discovery paper","pmids":["16796750"],"is_preprint":false},{"year":2008,"finding":"The CARD8 rs2043211 (C10X) stop-codon SNP does not abolish all CARD8 protein expression; novel CARD8 mRNA isoforms (conserved in primates) contain alternative N-terminal coding exons that circumvent the stop codon, yielding protein isoforms of ~47–60 kDa. Homozygous stop-allele subjects still express a 48 kDa CARD8 isoform.","method":"RT-PCR, EST database mining, immunoblot, SNP genotyping","journal":"European Journal of Human Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular characterization of isoforms and protein expression, establishes functional consequence of SNP on protein isoform repertoire","pmids":["18212821"],"is_preprint":false}],"current_model":"CARD8 is a cytosolic pattern-recognition receptor that undergoes constitutive autoproteolysis at a conserved SF/S motif within its ZU5-UPA (FIIND) domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; activating stimuli—including DPP8/9 inhibition, viral proteases (HIV-1, SARS-CoV-2, CVB3, picornaviruses), and protein folding stress—trigger 20S proteasome-mediated degradation of the NT fragment, releasing the CT (UPA+CARD) fragment from autoinhibition and from DPP9 sequestration, allowing CT self-oligomerization into helical filaments that directly recruit and activate caspase-1 (without ASC), leading to gasdermin D-mediated pyroptosis; beyond inflammasome sensing, CARD8 also functions as an anti-inflammatory scaffold by binding and inhibiting NLRP3 (preventing its deubiquitination and dephosphorylation), NOD2 (blocking nodosome assembly), caspase-1, caspase-9, and NF-κB pathway components, with disease-associated mutations disrupting these inhibitory interactions."},"narrative":{"mechanistic_narrative":"CARD8 is a cytosolic inflammasome-forming sensor that couples diverse cytoplasmic threats to caspase-1-dependent pyroptosis through a unique, ASC-independent mechanism [PMID:33420028, PMID:33420033, PMID:33053349]. The receptor is held inactive by constitutive autoproteolysis at a conserved SF/S motif within its ZU5-UPA (FIIND) domain, which generates non-covalently associated N-terminal and C-terminal fragments [PMID:22087307]. Activation is governed by degradation of the autoinhibitory N-terminal fragment: the ubiquitin-independent 20S proteasome partially degrades the disordered N-terminus in resting cells, and activating stimuli drive its complete destruction, freeing the C-terminal (UPA+CARD) fragment [PMID:33053349, PMID:35580636]. The dipeptidyl peptidase DPP9 imposes a second layer of restraint by directly binding CARD8 and enzymatically sequestering the liberated C-terminal fragment, such that both fragment degradation and disruption of the DPP9 complex are required for the C-terminus to self-oligomerize into helical CARD filaments that directly recruit and activate pro-caspase-1, triggering gasdermin D-mediated death [PMID:31525884, PMID:36649711, PMID:33420028, PMID:33420033]. This sensor detects DPP8/9 inhibition—including proline-peptide accumulation downstream of the M24B aminopeptidases PEPD and XPNPEP1—and protein-folding stress, and acts as a tripwire for viral proteases: HIV-1 protease, SARS-CoV-2 and coronavirus 3CL proteases, and Coxsackievirus B3/picornavirus 2A and 3C proteases cleave the rapidly evolving CARD8 N-terminus to trigger pyroptosis of infected or virion-exposed cells [PMID:35165443, PMID:33542150, PMID:37289745, PMID:36129453, PMID:38428396]. This drives pyroptosis of resting CD4+ and CD8+ T cells and contributes to T-cell depletion and clearance of latent HIV-1, while T-cell activation abolishes CARD8 function [PMID:32840892, PMID:33542150, PMID:38428396]. Beyond inflammasome sensing, CARD8 functions as an anti-inflammatory scaffold: it binds and inhibits NLRP3, preventing its deubiquitination, dephosphorylation, and oligomerization, with disease-associated mutations (V44I, frameshift truncations) disrupting NLRP3 binding via the FIIND/CARD region [PMID:24517500, PMID:29408806, PMID:28137891]. Earlier studies also reported CARD8 binding to caspase-1, NOD2 (blocking nodosome assembly and bactericidal activity), and components of the NF-κB pathway [PMID:11821383, PMID:20385562, PMID:12067710].","teleology":[{"year":2002,"claim":"Established the founding hypothesis that CARD8 is a negative regulator of inflammatory and apoptotic caspases, framing it initially as an inhibitory CARD scaffold.","evidence":"Co-IP and IL-1β/caspase activity assays in monocytic and transfected cells linking CARD8 to caspase-1, caspase-9, and NF-κB pathways","pmids":["11821383","11408476","12067710"],"confidence":"Medium","gaps":["Largely overexpression-based; physiological relevance of caspase-9/NF-κB inhibition not established in primary cells","Caspase-9 binding later contradicted in NSCLC cells"]},{"year":2005,"claim":"Showed isoform-specific function, with a 54 kDa TUCAN isoform binding FADD and inhibiting both caspase-8 and caspase-9, indicating that the CARD8 protein repertoire diversifies its regulatory targets.","evidence":"Co-IP, siRNA, and caspase/cell-death assays comparing 54 kDa vs 48 kDa isoforms","pmids":["16204039"],"confidence":"Medium","gaps":["Single-lab overexpression data","Endogenous relevance of the 54 kDa isoform not defined"]},{"year":2006,"claim":"Challenged the early caspase-9 inhibition model by failing to reproduce CARD8–procaspase-9 binding or functional effects in a different cellular context.","evidence":"Negative Co-IP and siRNA caspase-9 activity/viability assays in NSCLC cells","pmids":["16796750"],"confidence":"Medium","gaps":["Negative result in one cell type; does not exclude context-dependent interaction","Does not resolve which cellular settings, if any, support caspase-9 regulation"]},{"year":2008,"claim":"Resolved an apparent loss-of-function SNP paradox by showing alternative N-terminal exons circumvent the C10X stop codon, so CARD8 protein is still expressed in stop-allele homozygotes.","evidence":"RT-PCR, EST mining, immunoblot, and SNP genotyping defining ~47–60 kDa isoforms","pmids":["18212821"],"confidence":"Medium","gaps":["Functional consequences of each isoform not dissected","Does not establish tissue-specific isoform usage"]},{"year":2010,"claim":"Extended CARD8's inhibitory scaffold role to innate bacterial sensing by showing it restrains NOD2-driven nodosome assembly and bactericidal activity.","evidence":"Reciprocal Co-IP, siRNA, NF-κB reporter, and intracellular Listeria killing assays in intestinal epithelial cells","pmids":["20385562"],"confidence":"High","gaps":["Structural basis of CARD8–NOD2 interaction undefined","In vivo relevance not tested"]},{"year":2011,"claim":"Defined the biochemical basis of CARD8 regulation by identifying constitutive autoproteolysis at the FIIND SF/S motif, establishing the two-fragment architecture that underlies later activation models.","evidence":"Site-directed mutagenesis of the catalytic serine and flanking residues with immunoblot detection of cleavage; structural modeling identifying the ZU5-UPA domain","pmids":["22087307"],"confidence":"High","gaps":["Functional consequence of fragment generation not yet linked to inflammasome activation","No atomic structure of the FIIND at this stage"]},{"year":2014,"claim":"Anchored CARD8 as an endogenous NLRP3 brake by demonstrating selective binding to wild-type NLRP3 and suppression of IL-1β, with endogenous association in primary cells.","evidence":"Reciprocal Co-IP in HEK293 and PBMCs, IL-1β ELISA, siRNA in human macrophages","pmids":["24517500"],"confidence":"High","gaps":["Mechanism by which CAPS mutations escape CARD8 binding unresolved at this point","Which CARD8 domain mediates NLRP3 binding not yet mapped"]},{"year":2017,"claim":"Mapped the structural requirement for NLRP3 inhibition by showing a frameshift variant lacking FIIND/CARD cannot bind NLRP3's NOD domain.","evidence":"NGS, binding assays, and domain truncation analysis","pmids":["28137891"],"confidence":"Medium","gaps":["Single-lab binding data","Disease causality of the variant not established by rescue"]},{"year":2018,"claim":"Provided molecular and patient-level mechanism for CARD8-driven autoinflammation, showing the V44I mutation abolishes NLRP3 binding and acts dominant-negatively, and that intact CARD8 blocks NLRP3 deubiquitination and dephosphorylation.","evidence":"Whole-exome sequencing, immunoprecipitation, NLRP3 oligomerization/PTM immunoblots, patient monocyte IL-1β assays","pmids":["29408806"],"confidence":"High","gaps":["How CARD8 controls NLRP3 PTM enzymatically undefined","Genetic causality across larger cohorts not addressed"]},{"year":2019,"claim":"Distinguished CARD8 from NLRP1 by showing DPP9 restrains it through enzymatic activity rather than simple binding, since DPP8/9 inhibitors and autoproteolysis mutants do not disrupt the DPP9–CARD8 interaction.","evidence":"Activity-based probes, reconstituted cell-death assays, MS proteomics, catalytically inactive DPP9 rescue in knockout cells","pmids":["31525884"],"confidence":"High","gaps":["Structural basis of DPP9–CARD8 distinct from DPP9–NLRP1 not resolved here","Identity of the relevant DPP9 substrate/product unclear"]},{"year":2020,"claim":"Identified the activation switch as proteasomal destruction of the autoinhibitory N-terminal fragment that frees the C-terminus, and demonstrated CARD8-driven pyroptosis in primary resting T cells upon DPP8/9 inhibition.","evidence":"Domain deletion mapping, proteasome inhibition, and immunoblot of fragment degradation; CRISPR/siRNA of CARD8/caspase-1/GSDMD in primary CD4+/CD8+ T cells across species","pmids":["33053349","32840892","32796818"],"confidence":"High","gaps":["Why activated T cells become resistant not fully explained","Identity of the degradation machinery recognizing the NT fragment not yet defined"]},{"year":2021,"claim":"Resolved the activation mechanism structurally and established CARD8 as a viral-protease sensor: the C-terminal UPA+CARD self-assembles into helical filaments that recruit caspase-1 directly without ASC, and HIV-1 protease cleavage triggers pyroptosis enabling latent reservoir clearance.","evidence":"Cryo-EM of CARD8-CARD filaments with biochemical/cell-based caspase-1 recruitment assays; CRISPR knockout and pharmacological HIV protease activation in patient CD4+ T cells","pmids":["33420028","33420033","33542150"],"confidence":"High","gaps":["Stoichiometry of filament-to-caspase-1 activation in cells not quantified","Therapeutic window of latency-clearance approach not defined"]},{"year":2022,"claim":"Mechanistically connected upstream metabolism and broader pathogen sensing to CARD8, defining the 20S proteasome as the degrading enzyme, the PEPD/XPNPEP1–proline-peptide–DPP8/9 axis as a selective trigger, and CVB3 2A/3C proteases as activators in cardiovascular cells.","evidence":"Proteasome subunit knockdown/inhibitors with fragment immunoblots; CQ31 chemical biology with MS peptide profiling and genetic knockouts; CRISPR knockout and cleavage-site mapping in endothelial cells and cardiomyocytes","pmids":["35580636","35165443","36129453"],"confidence":"High","gaps":["How ZU5 unfolding licenses complete NT degradation not structurally resolved","In vivo contribution of CARD8 to viral myocarditis not established"]},{"year":2023,"claim":"Generalized CARD8 to a broadly tuned, rapidly evolving viral-protease tripwire and dissected the two-step activation requirement (NT degradation plus DPP9-complex disruption) under folding stress.","evidence":"CRISPR knockout, protease cleavage assays, comparative evolutionary/SNP analysis for SARS-CoV-2 and picornavirus 3C/3CL proteases and HIV-1; immunoblot of NT/CT fragments with DPP9 binding and cell-death assays under stress agents","pmids":["37289745","37417868","36649711"],"confidence":"High","gaps":["Endogenous physiological inducers of protein-folding-stress activation in vivo unclear","Functional consequences of human SNPs at population scale not defined"]},{"year":2024,"claim":"Demonstrated in vivo significance by showing virion-delivered HIV-1 protease activates CARD8 immediately at entry to kill quiescent CD4+ T cells, with CARD8-deficient humanized mice showing delayed CD4+ depletion and natural-host primates carrying CARD8 loss-of-function alleles.","evidence":"CARD8-knockout humanized mice, primary CD4+ T-cell entry assays with protease inhibitors, non-human primate CARD8 sequencing, cell-death assays","pmids":["38428396"],"confidence":"High","gaps":["Net effect of CARD8 activity on HIV pathogenesis (protective vs depleting) not fully reconciled","Therapeutic implications of modulating CARD8 in HIV not established"]},{"year":null,"claim":"How CARD8's anti-inflammatory scaffolding functions (NLRP3, NOD2, NF-κB regulation) mechanistically integrate with or are switched to its inflammasome-sensing role remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking scaffold inhibition and filament-forming activation","Enzymatic basis for CARD8 control of NLRP3 deubiquitination/dephosphorylation unknown","Structural basis of CARD8–NLRP3 and CARD8–NOD2 interactions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,8,4,0]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[12,16,18]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[14]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12,14]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,13,18,17]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,14,17]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[12,20,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[13,18,21,8]}],"complexes":["CARD8 inflammasome","CARD8-CARD filament"],"partners":["CASP1","DPP9","NLRP3","NOD2","CASP9","FADD"],"other_free_text":[]}},"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; IBD30","url":"https://www.omim.org/entry/619079"},{"mim_id":"609986","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 6; CARD6","url":"https://www.omim.org/entry/609986"},{"mim_id":"609364","title":"NLR FAMILY, PYRIN DOMAIN-CONTAINING 2; NLRP2","url":"https://www.omim.org/entry/609364"},{"mim_id":"609051","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 8; CARD8","url":"https://www.omim.org/entry/609051"},{"mim_id":"608258","title":"DIPEPTIDYL PEPTIDASE IX; DPP9","url":"https://www.omim.org/entry/608258"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CARD8"},"hgnc":{"alias_symbol":["TUCAN","KIAA0955","CARDINAL","NDPP","Dakar"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y2G2","domains":[{"cath_id":"2.60.220,2.60.220","chopping":"161-311","consensus_level":"high","plddt":87.7905,"start":161,"end":311},{"cath_id":"2.60.40.2660","chopping":"315-433","consensus_level":"high","plddt":91.3271,"start":315,"end":433},{"cath_id":"1.10.533.10","chopping":"451-537","consensus_level":"high","plddt":90.2708,"start":451,"end":537}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2G2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2G2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y2G2-F1-predicted_aligned_error_v6.png","plddt_mean":71.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CARD8","jax_strain_url":"https://www.jax.org/strain/search?query=CARD8"},"sequence":{"accession":"Q9Y2G2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y2G2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y2G2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y2G2"}},"corpus_meta":[{"pmid":"22087307","id":"PMC_22087307","title":"CARD8 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sickle cell disease in patients above 20 years of age: follow-up of 108 patients in Dakar].","date":"2003","source":"La Revue de medecine interne","url":"https://pubmed.ncbi.nlm.nih.gov/14604747","citation_count":12,"is_preprint":false},{"pmid":"28185410","id":"PMC_28185410","title":"NLRP3 p.Q705K and CARD8 p.C10X single nucleotide polymorphisms are not associated with susceptibility to rheumatoid arthritis: a meta-analysis.","date":"2017","source":"International journal of rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/28185410","citation_count":11,"is_preprint":false},{"pmid":"31428046","id":"PMC_31428046","title":"Investigation of NF-κB-94ins/del ATTG and CARD8 (rs2043211) Gene Polymorphism in Acute Lymphoblastic Leukemia.","date":"2019","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/31428046","citation_count":11,"is_preprint":false},{"pmid":"26283210","id":"PMC_26283210","title":"CARD8 gene variant is a risk factor for recurrent surgery in patients with Crohn's disease.","date":"2015","source":"Digestive and liver disease : official journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver","url":"https://pubmed.ncbi.nlm.nih.gov/26283210","citation_count":11,"is_preprint":false},{"pmid":"32689633","id":"PMC_32689633","title":"Combined polymorphisms in genes encoding the inflammasome components NLRP3 and CARD8 confer risk of ischemic stroke in men.","date":"2020","source":"Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association","url":"https://pubmed.ncbi.nlm.nih.gov/32689633","citation_count":11,"is_preprint":false},{"pmid":"35504551","id":"PMC_35504551","title":"Sensitivity and specificity for malaria classification of febrile persons by rapid diagnostic test, microscopy, parasite DNA, histidine-rich protein 2, and IgG: Dakar, Senegal 2015.","date":"2022","source":"International journal of infectious diseases : IJID : official 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\"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, two other negative regulators of caspase-1.\",\n      \"method\": \"Co-immunoprecipitation, overexpression in THP-1/U937 cells, ELISA for IL-1β\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays plus functional IL-1β readout in monocytic cells, single lab\",\n      \"pmids\": [\"11821383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CARD8 (TUCAN) CARD domain selectively binds procaspase-9 and interferes with Apaf-1–procaspase-9 interaction, suppressing caspase activation induced by cytochrome c/Apaf-1-dependent stimuli (Bax, VP16, staurosporine) but not Apaf-1-independent stimuli (Fas, granzyme B).\",\n      \"method\": \"Co-immunoprecipitation, stable/transient transfection, caspase activity assays, apoptosis assays\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays (binding + caspase activity + cell death) in a single lab study\",\n      \"pmids\": [\"11408476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CARD8 (TUCAN/CARDINAL) associates with DRAL and suppresses NF-κB activation; DRAL expression enhances NF-κB activity, suggesting DRAL and CARD8 participate in a common regulatory pathway controlling NF-κB.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter assay, overexpression\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP plus functional NF-κB reporter, single lab\",\n      \"pmids\": [\"12067710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A novel 54 kDa TUCAN isoform (TUCAN-54) suppresses both caspase-8 and caspase-9 activation; TUCAN-54 physically associates with Fas-associated death domain (FADD) — an interaction not seen with 48 kDa TUCAN — thereby inhibiting Fas-induced cell death in addition to mitochondrial pathway apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, gene transfection/siRNA, caspase activity assays, cell death assays\",\n      \"journal\": \"Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — binding assay plus loss-of-function (siRNA) and gain-of-function with specific phenotypic readouts, single lab\",\n      \"pmids\": [\"16204039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CARD8 physically interacts with NOD2 and inhibits nodosome assembly and downstream NF-κB signaling upon muramyl-dipeptide (MDP) stimulation; CARD8 also inhibits the direct bactericidal effect of NOD2 against intracellular Listeria monocytogenes infection.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assay, intracellular bacterial killing assay in intestinal epithelial cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional knockdown with two orthogonal phenotypic readouts (NF-κB signaling and bactericidal activity), single lab\",\n      \"pmids\": [\"20385562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CARD8 and NLRP1 undergo autoproteolytic cleavage at a conserved SF/S motif within their FIIND domain; site-directed mutagenesis showed the second serine of this motif is required for autoproteolysis, and conserved glutamic acid and histidine residues near the cleavage site regulate processing efficiency. Structural modeling identified FIIND as a ZU5-UPA domain.\",\n      \"method\": \"Site-directed mutagenesis, immunoblot detection of cleavage products, bioinformatics/structural modeling\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of active-site residues with direct biochemical readout of autoproteolysis, plus structural modeling supporting mechanism\",\n      \"pmids\": [\"22087307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CARD8 interacts with wild-type NLRP3 but not with CAPS-associated mutant forms of NLRP3; CARD8 significantly reduces IL-1β secretion driven by wild-type NLRP3 but not mutant NLRP3; endogenous CARD8–NLRP3 association was confirmed in resting PBMCs; CARD8 knockdown increased IL-1β secretion from human macrophages.\",\n      \"method\": \"Co-immunoprecipitation (HEK293 and primary PBMCs), ELISA for IL-1β, siRNA knockdown in human monocyte-derived macrophages\",\n      \"journal\": \"Arthritis Research & Therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP in both overexpression and endogenous settings, plus loss-of-function in primary human cells with cytokine readout\",\n      \"pmids\": [\"24517500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A CARD8 frameshift variant (CARD8-FS) produces a truncated protein lacking the FIIND and CARD domains; this truncated protein fails to interact with the NOD domain of NLRP3, demonstrating that the FIIND/CARD region of CARD8 is required for NLRP3 binding and inflammasome inhibition.\",\n      \"method\": \"Next-generation sequencing, immunoprecipitation/binding assay, domain truncation analysis\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay with domain-deletion mutant establishing structural requirement, single lab\",\n      \"pmids\": [\"28137891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A V44I missense mutation in the T60 isoform of CARD8 prevents its binding to NLRP3 and inhibition of NLRP3 oligomerization; mutant T60 CARD8 also exerts a dominant-negative effect by forming oligomers with wild-type T60 and T48 CARD8 that prevent their NLRP3 binding. Intact CARD8 prevents NLRP3 deubiquitination and serine dephosphorylation.\",\n      \"method\": \"Whole exome sequencing, immunoprecipitation, immunoblot for NLRP3 oligomerization and post-translational modifications, patient monocyte functional assays (IL-1β ELISA)\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding assay, dominant-negative oligomerization, PTM analysis, patient cell functional data) establishing mechanism\",\n      \"pmids\": [\"29408806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DPP9 binds directly to CARD8 but, unlike DPP9–NLRP1, the DPP9–CARD8 interaction is not disrupted by DPP8/9 inhibitors or by CARD8 mutations that block autoproteolysis; catalytically inactive DPP9 fails to rescue CARD8-mediated cell death in DPP9 knockout cells, demonstrating that DPP9's enzymatic activity (not merely its binding to CARD8) restrains the CARD8 inflammasome.\",\n      \"method\": \"Activity-based probes, reconstituted inflammasome cell-death assays, mass spectrometry proteomics, DPP9 knockout cells\",\n      \"journal\": \"ACS Chemical Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted assay plus catalytic mutant rescue experiment establishing enzymatic mechanism, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31525884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DPP8/9 inhibitor Val-boroPro triggers CARD8 inflammasome-dependent pyroptosis in primary human resting CD4+ and CD8+ T cells via the CARD8–caspase-1–GSDMD axis; DPP9 is the relevant DPP restraining CARD8 activation in T cells. Activated T cells are resistant despite expressing all required components.\",\n      \"method\": \"Genetic dissection in primary T cells (CRISPR/siRNA knockdown of CARD8, caspase-1, GSDMD), cell death morphology/biochemistry, immunoblot\",\n      \"journal\": \"The EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function of multiple pathway components in primary human T cells with defined pyroptosis phenotype, confirmed by morphological and biochemical hallmarks\",\n      \"pmids\": [\"32840892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DPP8/9 inhibitors activate CARD8-mediated pyroptosis in resting human and rodent lymphocytes (CD4+ and CD8+ T cells); species-specific variation in T cell sensitivity is observed.\",\n      \"method\": \"Pharmacological inhibition, genetic validation (CARD8 knockdown), cell viability assays across species\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown confirming CARD8 requirement in T cells, independently corroborating EMBO Journal findings, single lab\",\n      \"pmids\": [\"32796818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DPP8/9 inhibition activates a proteasomal degradation pathway targeting CARD8's N-terminal disordered region (~160 amino acids); degradation of the N-terminal fragment frees the C-terminal fragment to activate caspase-1 and induce pyroptosis. CARD8 thus serves as a sensor of activation of a degradation pathway for disordered/misfolded proteins.\",\n      \"method\": \"Domain mapping/deletion analysis, proteasome inhibition, cell death assays, immunoblot for fragment degradation\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure–function mutagenesis plus proteasome inhibition with direct biochemical readout, multiple orthogonal methods in single study\",\n      \"pmids\": [\"33053349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CARD8 senses HIV-1 protease activity; premature intracellular activation of the viral protease triggers CARD8 inflammasome-mediated pyroptosis of HIV-1-infected cells, enabling clearance of latent HIV-1 in patient CD4+ T cells after viral reactivation.\",\n      \"method\": \"CRISPR knockout of CARD8, pharmacological HIV protease activation, cell death assays, patient CD4+ T cell latency clearance model\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CARD8 genetic knockout with mechanistic protease-activity requirement, validated in patient primary cells with latency model, replicated across experimental systems\",\n      \"pmids\": [\"33542150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of CARD8-CARD filaments (3.7 Å) reveal that CARD8-CT (UPA+CARD) self-oligomerizes to form helical filaments; CARD8 directly recruits pro-caspase-1 (not ASC) via unique CARD–CARD interactions, distinguishing CARD8 from NLRP1 which requires ASC. The UPA subdomain lowers the threshold for CARD filament formation.\",\n      \"method\": \"Cryo-EM structure determination, biochemical reconstitution, cell-based ASC speck/caspase-1 recruitment assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic cryo-EM structure with biochemical and cell-based validation of CARD8-specific caspase-1 recruitment mechanism, two independent studies (PMIDs 33420028 and 33420033)\",\n      \"pmids\": [\"33420028\", \"33420033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The core 20S proteasome (ubiquitin-independent) degrades the disordered N-terminal region of CARD8; in unstimulated cells, partial degradation of the disordered region leaves a folded ZU5/UPA/CARD inhibitory fragment, but Val-boroPro stress causes complete NT degradation (possibly via ZU5 unfolding), releasing the CT fragment to activate the inflammasome.\",\n      \"method\": \"Proteasome subunit knockdown, 20S proteasome inhibitors, immunoblot of CARD8 fragments, cell death assays, domain mutants\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted proteasome-degradation mechanism with multiple domain mutants and inhibitor experiments, mechanistic detail beyond prior work\",\n      \"pmids\": [\"35580636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"M24B aminopeptidases prolidase (PEPD) and XPNPEP1 are upstream regulators of CARD8; their inhibition by CQ31 leads to accumulation of proline-containing peptides that inhibit DPP8/9, selectively activating CARD8 but not NLRP1 (because NLRP1 directly contacts DPP8/9's active site and proline peptides cannot disrupt this).\",\n      \"method\": \"Chemical biology (selective inhibitor CQ31), DPP8/9 activity assays, mass spectrometry for peptide accumulation, CARD8/NLRP1 cell death assays, genetic knockouts\",\n      \"journal\": \"Nature Chemical Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mechanistic pathway reconstituted from upstream enzyme inhibition through peptide accumulation to selective CARD8 activation, with genetic validation\",\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 Coxsackievirus B3 (CVB3) 2A and 3C proteases cleaving CARD8 at p.G38; CARD8 genetic deletion in endothelial cells and cardiomyocytes attenuates CVB3-induced pyroptosis, inflammation, and viral propagation.\",\n      \"method\": \"CRISPR knockout of CARD8 in endothelial cells and hESC-derived cardiomyocytes, protease cleavage site mapping, cell death assays, viral propagation assay, co-culture system\",\n      \"journal\": \"The Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with specific cleavage site identification in multiple cardiovascular cell types with defined mechanistic and virological phenotypes\",\n      \"pmids\": [\"36129453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SARS-CoV-2 and diverse coronaviruses 3CL protease cleaves a rapidly evolving region of human CARD8, activating a robust inflammasome response; CARD8 is required for cell death and pro-inflammatory cytokine release during SARS-CoV-2 infection. Natural variation in this 'tripwire' region alters species-specific sensing (e.g., 3CLpro antagonizes rather than activates megabat CARD8), and a human SNP reduces CARD8 sensing of coronavirus 3CLpros while enabling sensing of select picornavirus 3C proteases.\",\n      \"method\": \"CRISPR knockout, protease cleavage assays, inflammasome activation assays, comparative evolutionary analysis, SNP functional characterization\",\n      \"journal\": \"PLoS Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout confirming CARD8 requirement, direct cleavage site mapping, cross-species natural variation experiments, multiple orthogonal methods\",\n      \"pmids\": [\"37289745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HIV-1 protease cleaves the CARD8 N-terminus at a site unique to humans (arising after the human–chimpanzee divergence); cleavage by both de novo translated HIV-1 protease and packaged virion-associated protease activates CARD8 pyroptosis. TLR stimulation prior to infection modulates the magnitude of CARD8-induced pyroptosis. SIVcpz cleaves human CARD8 despite not activating chimpanzee CARD8, suggesting SIVcpz was poised to activate human CARD8 before cross-species transmission.\",\n      \"method\": \"Protease cleavage site mapping, CARD8 knockout/knockin, evolutionary sequence analysis, cell death assays with packaged vs. de novo HIV protease\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cleavage site identification, genetic knockout, multiple viral conditions, evolutionary mechanistic analysis\",\n      \"pmids\": [\"37417868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Several agents that cause protein folding stress (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate CARD8 N-terminal fragment degradation; however, the released C-terminal fragments are sequestered by DPP9, and DPP9-binding ligands must additionally be present to disrupt DPP9–CARD8 CT complexes and allow CT oligomerization into active inflammasomes.\",\n      \"method\": \"Immunoblot of NT/CT fragment levels, pharmacological stress agents, DPP9 binding assays, cell death assays\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple stress agent classes tested with biochemical and functional readouts; DPP9 sequestration of CT fragment mechanistically established, single lab\",\n      \"pmids\": [\"36649711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The CARD8 inflammasome is activated immediately after HIV entry by viral protease activity from incoming virions (before de novo viral replication); CARD8 sensing leads to pyroptosis of quiescent CD4+ T cells without productive infection, while T cell activation abolishes CARD8 function and increases permissiveness to infection. In humanized mice reconstituted with CARD8-deficient cells, CD4+ T cell depletion is delayed despite high viremia. 'Natural host' sooty mangabeys harbor loss-of-function CARD8 mutations, potentially explaining non-pathogenic SIV infection.\",\n      \"method\": \"CARD8 knockout humanized mice, primary CD4+ T cell assays, HIV entry experiments with protease inhibitors, CARD8 sequencing in non-human primates, cell death assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout in humanized animal model with in vivo CD4+ depletion phenotype, mechanistic protease-activity requirement, and cross-species evolutionary validation\",\n      \"pmids\": [\"38428396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TUCAN (CARD8) interactions with procaspase-9 could not be demonstrated by co-immunoprecipitation or other protein interaction assays in NSCLC cells; siRNA-mediated knockdown of TUCAN did not restore cisplatin-induced caspase-9 activation or affect cisplatin sensitivity, indicating TUCAN does not inhibit procaspase-9 in this cellular context (NEGATIVE RESULT).\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, caspase-9 activity assay, cell viability assay\",\n      \"journal\": \"BMC Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple negative experimental approaches (binding assays + loss-of-function) in NSCLC cells, single lab; contradicts earlier pulldown data from TUCAN discovery paper\",\n      \"pmids\": [\"16796750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The CARD8 rs2043211 (C10X) stop-codon SNP does not abolish all CARD8 protein expression; novel CARD8 mRNA isoforms (conserved in primates) contain alternative N-terminal coding exons that circumvent the stop codon, yielding protein isoforms of ~47–60 kDa. Homozygous stop-allele subjects still express a 48 kDa CARD8 isoform.\",\n      \"method\": \"RT-PCR, EST database mining, immunoblot, SNP genotyping\",\n      \"journal\": \"European Journal of Human Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular characterization of isoforms and protein expression, establishes functional consequence of SNP on protein isoform repertoire\",\n      \"pmids\": [\"18212821\"],\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 ZU5-UPA (FIIND) domain, generating non-covalently associated N-terminal (NT) and C-terminal (CT) fragments; activating stimuli—including DPP8/9 inhibition, viral proteases (HIV-1, SARS-CoV-2, CVB3, picornaviruses), and protein folding stress—trigger 20S proteasome-mediated degradation of the NT fragment, releasing the CT (UPA+CARD) fragment from autoinhibition and from DPP9 sequestration, allowing CT self-oligomerization into helical filaments that directly recruit and activate caspase-1 (without ASC), leading to gasdermin D-mediated pyroptosis; beyond inflammasome sensing, CARD8 also functions as an anti-inflammatory scaffold by binding and inhibiting NLRP3 (preventing its deubiquitination and dephosphorylation), NOD2 (blocking nodosome assembly), caspase-1, caspase-9, and NF-κB pathway components, with disease-associated mutations disrupting these inhibitory interactions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CARD8 is a cytosolic inflammasome-forming sensor that couples diverse cytoplasmic threats to caspase-1-dependent pyroptosis through a unique, ASC-independent mechanism [#14, #12]. The receptor is held inactive by constitutive autoproteolysis at a conserved SF/S motif within its ZU5-UPA (FIIND) domain, which generates non-covalently associated N-terminal and C-terminal fragments [#5]. Activation is governed by degradation of the autoinhibitory N-terminal fragment: the ubiquitin-independent 20S proteasome partially degrades the disordered N-terminus in resting cells, and activating stimuli drive its complete destruction, freeing the C-terminal (UPA+CARD) fragment [#12, #15]. The dipeptidyl peptidase DPP9 imposes a second layer of restraint by directly binding CARD8 and enzymatically sequestering the liberated C-terminal fragment, such that both fragment degradation and disruption of the DPP9 complex are required for the C-terminus to self-oligomerize into helical CARD filaments that directly recruit and activate pro-caspase-1, triggering gasdermin D-mediated death [#9, #20, #14]. This sensor detects DPP8/9 inhibition—including proline-peptide accumulation downstream of the M24B aminopeptidases PEPD and XPNPEP1—and protein-folding stress, and acts as a tripwire for viral proteases: HIV-1 protease, SARS-CoV-2 and coronavirus 3CL proteases, and Coxsackievirus B3/picornavirus 2A and 3C proteases cleave the rapidly evolving CARD8 N-terminus to trigger pyroptosis of infected or virion-exposed cells [#16, #13, #18, #17, #21]. This drives pyroptosis of resting CD4+ and CD8+ T cells and contributes to T-cell depletion and clearance of latent HIV-1, while T-cell activation abolishes CARD8 function [#10, #13, #21]. Beyond inflammasome sensing, CARD8 functions as an anti-inflammatory scaffold: it binds and inhibits NLRP3, preventing its deubiquitination, dephosphorylation, and oligomerization, with disease-associated mutations (V44I, frameshift truncations) disrupting NLRP3 binding via the FIIND/CARD region [#6, #8, #7]. Earlier studies also reported CARD8 binding to caspase-1, NOD2 (blocking nodosome assembly and bactericidal activity), and components of the NF-\\u03baB pathway [#0, #4, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the founding hypothesis that CARD8 is a negative regulator of inflammatory and apoptotic caspases, framing it initially as an inhibitory CARD scaffold.\",\n      \"evidence\": \"Co-IP and IL-1\\u03b2/caspase activity assays in monocytic and transfected cells linking CARD8 to caspase-1, caspase-9, and NF-\\u03baB pathways\",\n      \"pmids\": [\"11821383\", \"11408476\", \"12067710\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Largely overexpression-based; physiological relevance of caspase-9/NF-\\u03baB inhibition not established in primary cells\", \"Caspase-9 binding later contradicted in NSCLC cells\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed isoform-specific function, with a 54 kDa TUCAN isoform binding FADD and inhibiting both caspase-8 and caspase-9, indicating that the CARD8 protein repertoire diversifies its regulatory targets.\",\n      \"evidence\": \"Co-IP, siRNA, and caspase/cell-death assays comparing 54 kDa vs 48 kDa isoforms\",\n      \"pmids\": [\"16204039\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab overexpression data\", \"Endogenous relevance of the 54 kDa isoform not defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Challenged the early caspase-9 inhibition model by failing to reproduce CARD8\\u2013procaspase-9 binding or functional effects in a different cellular context.\",\n      \"evidence\": \"Negative Co-IP and siRNA caspase-9 activity/viability assays in NSCLC cells\",\n      \"pmids\": [\"16796750\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative result in one cell type; does not exclude context-dependent interaction\", \"Does not resolve which cellular settings, if any, support caspase-9 regulation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved an apparent loss-of-function SNP paradox by showing alternative N-terminal exons circumvent the C10X stop codon, so CARD8 protein is still expressed in stop-allele homozygotes.\",\n      \"evidence\": \"RT-PCR, EST mining, immunoblot, and SNP genotyping defining ~47\\u201360 kDa isoforms\",\n      \"pmids\": [\"18212821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of each isoform not dissected\", \"Does not establish tissue-specific isoform usage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended CARD8's inhibitory scaffold role to innate bacterial sensing by showing it restrains NOD2-driven nodosome assembly and bactericidal activity.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA, NF-\\u03baB reporter, and intracellular Listeria killing assays in intestinal epithelial cells\",\n      \"pmids\": [\"20385562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CARD8\\u2013NOD2 interaction undefined\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined the biochemical basis of CARD8 regulation by identifying constitutive autoproteolysis at the FIIND SF/S motif, establishing the two-fragment architecture that underlies later activation models.\",\n      \"evidence\": \"Site-directed mutagenesis of the catalytic serine and flanking residues with immunoblot detection of cleavage; structural modeling identifying the ZU5-UPA domain\",\n      \"pmids\": [\"22087307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of fragment generation not yet linked to inflammasome activation\", \"No atomic structure of the FIIND at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Anchored CARD8 as an endogenous NLRP3 brake by demonstrating selective binding to wild-type NLRP3 and suppression of IL-1\\u03b2, with endogenous association in primary cells.\",\n      \"evidence\": \"Reciprocal Co-IP in HEK293 and PBMCs, IL-1\\u03b2 ELISA, siRNA in human macrophages\",\n      \"pmids\": [\"24517500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CAPS mutations escape CARD8 binding unresolved at this point\", \"Which CARD8 domain mediates NLRP3 binding not yet mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mapped the structural requirement for NLRP3 inhibition by showing a frameshift variant lacking FIIND/CARD cannot bind NLRP3's NOD domain.\",\n      \"evidence\": \"NGS, binding assays, and domain truncation analysis\",\n      \"pmids\": [\"28137891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab binding data\", \"Disease causality of the variant not established by rescue\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided molecular and patient-level mechanism for CARD8-driven autoinflammation, showing the V44I mutation abolishes NLRP3 binding and acts dominant-negatively, and that intact CARD8 blocks NLRP3 deubiquitination and dephosphorylation.\",\n      \"evidence\": \"Whole-exome sequencing, immunoprecipitation, NLRP3 oligomerization/PTM immunoblots, patient monocyte IL-1\\u03b2 assays\",\n      \"pmids\": [\"29408806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CARD8 controls NLRP3 PTM enzymatically undefined\", \"Genetic causality across larger cohorts not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Distinguished CARD8 from NLRP1 by showing DPP9 restrains it through enzymatic activity rather than simple binding, since DPP8/9 inhibitors and autoproteolysis mutants do not disrupt the DPP9\\u2013CARD8 interaction.\",\n      \"evidence\": \"Activity-based probes, reconstituted cell-death assays, MS proteomics, catalytically inactive DPP9 rescue in knockout cells\",\n      \"pmids\": [\"31525884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DPP9\\u2013CARD8 distinct from DPP9\\u2013NLRP1 not resolved here\", \"Identity of the relevant DPP9 substrate/product unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified the activation switch as proteasomal destruction of the autoinhibitory N-terminal fragment that frees the C-terminus, and demonstrated CARD8-driven pyroptosis in primary resting T cells upon DPP8/9 inhibition.\",\n      \"evidence\": \"Domain deletion mapping, proteasome inhibition, and immunoblot of fragment degradation; CRISPR/siRNA of CARD8/caspase-1/GSDMD in primary CD4+/CD8+ T cells across species\",\n      \"pmids\": [\"33053349\", \"32840892\", \"32796818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why activated T cells become resistant not fully explained\", \"Identity of the degradation machinery recognizing the NT fragment not yet defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the activation mechanism structurally and established CARD8 as a viral-protease sensor: the C-terminal UPA+CARD self-assembles into helical filaments that recruit caspase-1 directly without ASC, and HIV-1 protease cleavage triggers pyroptosis enabling latent reservoir clearance.\",\n      \"evidence\": \"Cryo-EM of CARD8-CARD filaments with biochemical/cell-based caspase-1 recruitment assays; CRISPR knockout and pharmacological HIV protease activation in patient CD4+ T cells\",\n      \"pmids\": [\"33420028\", \"33420033\", \"33542150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of filament-to-caspase-1 activation in cells not quantified\", \"Therapeutic window of latency-clearance approach not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mechanistically connected upstream metabolism and broader pathogen sensing to CARD8, defining the 20S proteasome as the degrading enzyme, the PEPD/XPNPEP1\\u2013proline-peptide\\u2013DPP8/9 axis as a selective trigger, and CVB3 2A/3C proteases as activators in cardiovascular cells.\",\n      \"evidence\": \"Proteasome subunit knockdown/inhibitors with fragment immunoblots; CQ31 chemical biology with MS peptide profiling and genetic knockouts; CRISPR knockout and cleavage-site mapping in endothelial cells and cardiomyocytes\",\n      \"pmids\": [\"35580636\", \"35165443\", \"36129453\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ZU5 unfolding licenses complete NT degradation not structurally resolved\", \"In vivo contribution of CARD8 to viral myocarditis not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Generalized CARD8 to a broadly tuned, rapidly evolving viral-protease tripwire and dissected the two-step activation requirement (NT degradation plus DPP9-complex disruption) under folding stress.\",\n      \"evidence\": \"CRISPR knockout, protease cleavage assays, comparative evolutionary/SNP analysis for SARS-CoV-2 and picornavirus 3C/3CL proteases and HIV-1; immunoblot of NT/CT fragments with DPP9 binding and cell-death assays under stress agents\",\n      \"pmids\": [\"37289745\", \"37417868\", \"36649711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous physiological inducers of protein-folding-stress activation in vivo unclear\", \"Functional consequences of human SNPs at population scale not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated in vivo significance by showing virion-delivered HIV-1 protease activates CARD8 immediately at entry to kill quiescent CD4+ T cells, with CARD8-deficient humanized mice showing delayed CD4+ depletion and natural-host primates carrying CARD8 loss-of-function alleles.\",\n      \"evidence\": \"CARD8-knockout humanized mice, primary CD4+ T-cell entry assays with protease inhibitors, non-human primate CARD8 sequencing, cell-death assays\",\n      \"pmids\": [\"38428396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Net effect of CARD8 activity on HIV pathogenesis (protective vs depleting) not fully reconciled\", \"Therapeutic implications of modulating CARD8 in HIV not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CARD8's anti-inflammatory scaffolding functions (NLRP3, NOD2, NF-\\u03baB regulation) mechanistically integrate with or are switched to its inflammasome-sensing role remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking scaffold inhibition and filament-forming activation\", \"Enzymatic basis for CARD8 control of NLRP3 deubiquitination/dephosphorylation unknown\", \"Structural basis of CARD8\\u2013NLRP3 and CARD8\\u2013NOD2 interactions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 8, 4, 0]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [12, 16, 18]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 13, 18, 17]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 14, 17]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [12, 20, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 18, 21, 8]}\n    ],\n    \"complexes\": [\"CARD8 inflammasome\", \"CARD8-CARD filament\"],\n    \"partners\": [\"CASP1\", \"DPP9\", \"NLRP3\", \"NOD2\", \"CASP9\", \"FADD\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}