{"gene":"BCL10","run_date":"2026-04-28T17:12:38","timeline":{"discoveries":[{"year":1999,"finding":"BCL10 encodes a protein with an N-terminal caspase recruitment domain (CARD); wild-type BCL10 activates NF-κB and induces apoptosis, while C-terminal truncation mutants activate NF-κB but lose pro-apoptotic activity and gain transforming activity, mapping functional domains to specific regions.","method":"Overexpression in 293/MCF7 cells, mutational analysis, transformation assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — original discovery with mutagenesis and multiple functional readouts, replicated across two independent labs (PMID:9989495 and PMID:10319863)","pmids":["9989495","10319863"],"is_preprint":false},{"year":2001,"finding":"BCL10 is required for antigen receptor (TCR/BCR)-induced NF-κB activation in lymphocytes; bcl10-/- mice show severe immunodeficiency with absent antigen receptor-induced NF-κB activation, while MAPK, AP-1, Ca2+ signaling remain intact, placing BCL10 specifically in the antigen-receptor-to-NF-κB pathway.","method":"Knockout mouse model, lymphocyte stimulation assays, NF-κB activation assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with defined cellular phenotype and pathway placement, foundational paper","pmids":["11163238"],"is_preprint":false},{"year":2001,"finding":"BCL10 forms a strong complex with MALT1; BCL10 mediates oligomerization and activation of the MALT1 caspase-like domain, and together BCL10 and MALT1 synergistically activate NF-κB through the IKK complex.","method":"Co-immunoprecipitation, NF-κB reporter assays, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional readout; replicated in multiple subsequent studies","pmids":["11262391"],"is_preprint":false},{"year":2001,"finding":"CARMA1 (Carma1) binds BCL10 via its CARD domain, induces translocation of BCL10 from the cytoplasm into perinuclear structures, causes phosphorylation of BCL10, and activates NF-κB; CARMA1 is a scaffold for the BCL10-dependent NF-κB signaling pathway in T cells.","method":"Co-immunoprecipitation, fluorescence microscopy, phosphorylation assay, NF-κB reporter assay","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 — Co-IP with localization and functional data; confirmed by multiple subsequent studies","pmids":["11356195"],"is_preprint":false},{"year":2003,"finding":"BCL10 activates NF-κB through promoting lysine-63-linked polyubiquitination of NEMO (IKKγ); paracaspase (MALT1) and the ubiquitin-conjugating enzyme UBC13 are both required for BCL10-induced NEMO ubiquitination; a NEMO mutant unable to be ubiquitinated blocks BCL10-induced NF-κB activation.","method":"Ubiquitination assay, mutant NEMO rescue, siRNA knockdown of MALT1 and UBC13","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — biochemical ubiquitination assay with mutagenesis and RNAi validation","pmids":["14695475"],"is_preprint":false},{"year":2003,"finding":"Bcl10 deficiency impairs development of follicular, marginal zone, and B1 B cells; Bcl10-/- follicular and marginal zone B cells fail to proliferate normally, and marginal zone B cells fail to activate NF-κB after LPS stimulation, establishing Bcl10 as essential for all mature B cell subset development.","method":"Knockout mouse model, B-cell subset analysis, proliferation assays, NF-κB activation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — comprehensive knockout phenotype with multiple orthogonal readouts","pmids":["12910267"],"is_preprint":false},{"year":2004,"finding":"T-cell activation via PKC or TCR/CD28 induces Bcl10 degradation through the lysosomal pathway (not proteasome); HECT domain ubiquitin ligases NEDD4 and Itch promote ubiquitination and lysosomal degradation of Bcl10, selectively terminating IKK/NF-κB signaling as a negative feedback mechanism.","method":"Western blot, proteasome inhibitors, lysosomal localization, ubiquitin ligase overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods identifying writers and pathway","pmids":["15082780"],"is_preprint":false},{"year":2006,"finding":"cIAP2 functions as an E3 ubiquitin ligase that ubiquitinates BCL10 and targets it for degradation, thereby inhibiting antigen receptor-mediated NF-κB activation; the cIAP2-MALT1 fusion protein lacks E3 activity, stabilizing BCL10 and promoting NF-κB in MALT lymphomas.","method":"In vitro ubiquitination assay, co-immunoprecipitation, BCL10 protein level measurement","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 — in vitro ubiquitination assay with E3 identification and functional consequence","pmids":["16395405"],"is_preprint":false},{"year":2006,"finding":"IKKβ is required for initial CBM complex formation and subsequently phosphorylates Bcl10 at the C terminus, interfering with Bcl10/MALT1 association and Bcl10-mediated IKKγ ubiquitination; IKKβ-mediated phosphorylation of Bcl10 thus exerts negative feedback on T cell NF-κB activation.","method":"Kinase assay, co-immunoprecipitation, phosphorylation site mutants, primary T cell cytokine assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — kinase assay with site-specific mutagenesis and functional primary T cell readout","pmids":["16818229"],"is_preprint":false},{"year":2006,"finding":"Bcl10 and Malt1 are essential for FcεRI-induced NF-κB activation and pro-inflammatory cytokine production in mast cells but are dispensable for degranulation and leukotriene secretion, demonstrating that Bcl10/Malt1 selectively uncouple NF-κB-dependent cytokine production from other mast cell responses.","method":"Knockout mouse model (Bcl10-/- and Malt1-/-), mast cell activation assays, NF-κB assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with clean cellular phenotype and specific readouts","pmids":["16432253"],"is_preprint":false},{"year":2006,"finding":"Bcl10 and Malt1 are required for lysophosphatidic acid (LPA)-induced NF-κB activation in non-immune cells (MEFs); Bcl10 cooperates with PKC for LPA-induced NF-κB but is dispensable for JNK, p38, ERK, and Akt activation, establishing a GPCR-triggered NF-κB pathway through Bcl10/Malt1.","method":"Knockout MEFs, NF-κB activation assays, cytokine measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined pathway specificity using orthogonal signaling readouts","pmids":["17095601"],"is_preprint":false},{"year":2006,"finding":"Bcl10 is required for NF-κB activation induced by G protein-coupled receptors (GPCRs) in non-lymphoid cells; Bcl10 deficiency blocks NF-κB activation by constitutively active Gα or stimulation with LPA or endothelin-1, but not by TNF-α, LPS, or integrin stimulation.","method":"Bcl10-/- cells, constitutively active G protein constructs, specific NF-κB activation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic evidence with multiple receptor stimuli tested","pmids":["17179215"],"is_preprint":false},{"year":2006,"finding":"CaMKII phosphorylates Bcl10 on Ser138; S138A mutation prolongs Bcl10-induced NF-κB activation, indicating phosphorylation at this site attenuates NF-κB activation as a negative regulatory mechanism.","method":"In vitro kinase assay, CaMKII inhibitor (KN93), CaMKII siRNA, S138A mutagenesis, NF-κB reporter assay","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with site-specific mutagenesis and functional validation","pmids":["17052756"],"is_preprint":false},{"year":2007,"finding":"Bcl10 is rapidly phosphorylated upon T cell activation; Ser138 is a key phosphorylation residue; a S138A phosphorylation-deficient mutant specifically inhibits TCR-induced actin polymerization without affecting NF-κB activation; Bcl10 silencing (but not Carma1 silencing) impairs TCR-induced F-actin formation, cell spreading, and conjugate formation, and also FcγR-induced actin polymerization and phagocytosis in monocytes.","method":"siRNA knockdown, phospho-site mutagenesis, F-actin imaging, phagocytosis assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis with multiple orthogonal functional readouts separating NF-κB from actin roles","pmids":["17371994"],"is_preprint":false},{"year":2007,"finding":"Phosphorylation of Bcl10 at S138 promotes ubiquitination and subsequent degradation of Bcl10, downregulating Bcl10 protein levels and negatively regulating TCR-mediated NF-κB activation; S138A mutant shows impaired ubiquitination, reduced degradation, and prolonged NF-κB activation with enhanced IL-2 production.","method":"TCR stimulation of T cells, phospho-site mutation (S138A), ubiquitination assay, NF-κB reporter, IL-2 ELISA","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — site-specific mutagenesis linking phosphorylation to ubiquitination and functional outcome","pmids":["17502353"],"is_preprint":false},{"year":2007,"finding":"PKCβ phosphorylates CARMA1 on Ser668, which is essential for BCR-mediated CARMA1-Bcl10-MALT1 association and IKK activation; downstream IKKβ further facilitates CBM complex formation through positive feedback phosphorylation of CARMA1.","method":"Phosphorylation site mutagenesis, co-immunoprecipitation, IKK activation assay in B cells","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — site-specific mutagenesis with functional Co-IP and IKK readout","pmids":["18086859"],"is_preprint":false},{"year":2008,"finding":"Bcl10 undergoes K63-linked polyubiquitination at K31 and K63 in response to T cell activation; ubiquitinated Bcl10 binds NEMO via NEMO's ubiquitin-binding activity; mutation of K31/K63 prevents ubiquitination, NEMO binding, and NF-κB activation without affecting CBM complex assembly.","method":"Ubiquitination mapping, site-directed mutagenesis (K31R/K63R), NEMO binding assay, NF-κB activation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — ubiquitination site mapping with mutagenesis and defined functional consequence","pmids":["18287044"],"is_preprint":false},{"year":2008,"finding":"BCL10 mediates TLR4/LPS-induced NF-κB activation in intestinal epithelial cells through a MyD88-dependent pathway; TLR4 blocking antibody or siRNA reduces BCL10 and IL-8 induction, and Bcl10 is recruited to TLR4 signaling complexes.","method":"TLR4 blocking antibody, TLR4 siRNA, dominant-negative MyD88, fluorescence-tagged carrageenan binding, Bcl10 siRNA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple knockdown approaches in human cells but no in vitro reconstitution","pmids":["18252714"],"is_preprint":false},{"year":2008,"finding":"The CARMA3-Bcl10-MALT1 (CBM) complex mediates CXCL8/IL-8-induced NF-κB activation and VEGF upregulation in endothelial cells downstream of CXCR2; knockdown of Carma3, Bcl10, or MALT1 inhibits this pathway.","method":"siRNA knockdown of CBM components, NF-κB reporter, VEGF ELISA","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — siRNA knockdown with multiple readouts but no reconstitution","pmids":["19112107"],"is_preprint":false},{"year":2008,"finding":"Multiple protein domains mediate Bcl10-MALT1 interaction: residues Asp80 and Glu84 of helix 5 of the Bcl10 CARD directly contact MALT1; the MALT1 death domain also contributes to the interaction; the 13-aa region downstream of the Bcl10 CARD interacts with MALT1 Ig-like domains.","method":"Co-immunoprecipitation, FRET in T cells, molecular modeling, point mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — FRET plus mutagenesis with multiple orthogonal methods","pmids":["18806265"],"is_preprint":false},{"year":2004,"finding":"BCL10 mediates LPS/TLR4-induced NF-κB activation via interaction with Pellino2; IRAK-1 acts as the upstream adaptor recruiting BCL10 to the TLR4 complex; BCL10-MALT1-TRAF6-TAK1 cascade transduces the signal; BCL10 oligomerization is required for this function; SOCS3 negatively regulates BCL10 in this pathway.","method":"Co-immunoprecipitation, BCL10-deficient macrophage line, NF-κB assay, SOCS3 overexpression","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP with functional cell-line KO and multiple pathway components tested","pmids":["15213237","16831874"],"is_preprint":false},{"year":2005,"finding":"MALT1 contains nuclear export signals (NES) and regulates cytoplasmic localization of BCL10; MALT1 is involved in nuclear export of BCL10 in an NES-dependent manner, as demonstrated by leptomycin B treatment; this explains nuclear BCL10 in t(1;14) and t(11;18) MALT lymphomas.","method":"NES deletion mutants, leptomycin B treatment, subcellular fractionation/immunofluorescence","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — defined localization mechanism with mutant analysis and pharmacological inhibition","pmids":["16123224"],"is_preprint":false},{"year":2011,"finding":"The calcium-dependent phosphatase calcineurin positively regulates CBM complex formation by dephosphorylating Bcl10; calcineurin interacts with the CBM complex; inhibition by cyclosporin A or FK506 or calcineurin siRNA impairs CBM assembly and TCR-induced NF-κB activation, correlating with Bcl10 hyperphosphorylation.","method":"Co-immunoprecipitation, in vivo and in vitro phosphatase assay, cyclosporin A/FK506, calcineurin siRNA, NF-κB reporter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro and in vivo dephosphorylation assays with pharmacological and genetic validation","pmids":["21199863"],"is_preprint":false},{"year":2011,"finding":"MIB2 E3 ubiquitin ligase is a novel component of the activated BCL10 complex; MIB2 directly interacts with BCL10, promotes autoubiquitination and ubiquitination of IKKγ/NEMO, and recruits/activates TAK1; MIB2 knockdown inhibits BCL10-dependent NF-κB activation.","method":"Proteomic pulldown, in vitro translation/pulldown, overexpression, siRNA knockdown, NF-κB reporter","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — pulldown with functional validation by knockdown","pmids":["21896478"],"is_preprint":false},{"year":2012,"finding":"Bcl10 regulates actin dynamics and membrane remodeling downstream of FcγR in macrophages in an NF-κB-independent manner; Bcl10 depletion impairs Rac1 and PI3K activation, leads to abortive phagocytic cup with excess PI(4,5)P2, Cdc42, and F-actin; Bcl10 forms a complex with clathrin adaptors AP1 and EpsinR and is required to deliver OCRL phosphatase locally.","method":"siRNA depletion, live-cell imaging, phagocytosis assay, Co-IP, PI analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing NF-κB-independent actin regulatory role","pmids":["23153494"],"is_preprint":false},{"year":2013,"finding":"The reconstituted CBM signalosome is a helical filamentous assembly; substoichiometric CARMA1 nucleates Bcl10 CARD filament formation in a highly cooperative process; the Bcl10 CARD filament structure was determined by crystallography, NMR, and EM; structure-guided mutagenesis confirmed interfaces for Bcl10 filament assembly and MALT1 activation.","method":"Reconstitution, cryo-EM, crystallography, NMR, electron microscopy, site-directed mutagenesis, NF-κB reporter assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — reconstitution, structure by multiple methods, and mutagenesis validation","pmids":["24074955"],"is_preprint":false},{"year":2013,"finding":"USP9X deubiquitinating enzyme interacts with Bcl10 and removes TCR-induced ubiquitin chains from Bcl10, facilitating association of CARMA1 with the Bcl10-Malt1 sub-complex; USP9X knockdown attenuates NF-κB activation and T cell proliferation.","method":"Co-immunoprecipitation, USP9X knockdown, NF-κB activation assay, T cell proliferation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP and knockdown with defined mechanistic role","pmids":["23690623"],"is_preprint":false},{"year":2014,"finding":"TCR signals to NF-κB are transmitted via a cytosolic p62-Bcl10-Malt1-IKK signalosome; p62 is required for Bcl10-Malt1 clustering; IKK is recruited to and activated within this signalosome; TAK1 and IKK activities are required for IKK phosphorylation but not signalosome assembly, ordering the pathway.","method":"Biochemical fractionation, confocal imaging, p62-/- T cells, kinase inhibitors, Co-IP","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — genetic and pharmacological evidence with defined pathway ordering","pmids":["24825920"],"is_preprint":false},{"year":2015,"finding":"Constitutively active CARD11 L225LI associates with BCL10 and MALT1 to simultaneously activate NF-κB and JNK; genetic deficiency of BCL10 or MALT1 completely rescues lymphoproliferation in CARD11 gain-of-function mice, demonstrating BCL10 is essential downstream of oncogenic CARD11 for both NF-κB and JNK activation.","method":"Conditional knock-in mouse, BCL10/MALT1 knockout rescue epistasis, JNK inhibitor","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with complete rescue phenotype","pmids":["26668357"],"is_preprint":false},{"year":2016,"finding":"CARD14 psoriasis mutants (E138A, G117S) constitutively interact with BCL10 and MALT1 and trigger BCL10- and MALT1-dependent NF-κB activation in keratinocytes by disrupting the autoinhibitory effect of the CARD14 linker region on BCL10 binding; CARD14 E138A also stimulates MALT1 paracaspase activity.","method":"Co-immunoprecipitation, NF-κB reporter, MALT1 paracaspase activity assay, siRNA knockdown","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — multiple assays defining mechanism with mutagenesis and enzymatic readout","pmids":["27071417"],"is_preprint":false},{"year":2018,"finding":"Cryo-EM structure of the BCL10 CARD filament at 4.0 Å reveals the CARD-CARD interaction interfaces; CARMA1 serves as a hub for star-shaped filamentous BCL10 networks and decreases BCL10 polymerization lag; MALT1 cooperatively binds BCL10 filaments and immediately dimerizes; TRAF6 cooperatively decorates CBM filaments to form higher-order assemblies.","method":"Cryo-EM structure determination, time-lapse confocal imaging, in vitro polymerization assay, EM","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with biochemical and live-cell imaging validation","pmids":["29382759"],"is_preprint":false},{"year":2018,"finding":"GSK3β phosphorylates BCL10 and is required for CBM complex formation; pharmacological inhibition or RNAi knockdown of GSK3β reduces BCL10 phosphorylation, CBM complex formation, MALT1-catalyzed cleavage of BCL10/RelB/CYLD, IκBα degradation, and NF-κB activation in activated T cells.","method":"GSK3β inhibitors, siRNA, phosphorylation assay, Co-IP, NF-κB reporter, MALT1 cleavage assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — multiple assays with pharmacological and genetic tools but single lab","pmids":["29358699"],"is_preprint":false},{"year":2011,"finding":"CaMKII is recruited to the immunological synapse where it interacts with and phosphorylates the Bcl10 CARD domain; this phosphorylation regulates interactions within the Carma1-Bcl10-Malt1 complex and the TCR-induced ubiquitinations of Bcl10 and IKKγ.","method":"Immunological synapse imaging, co-immunoprecipitation, in vitro kinase assay, ubiquitination assay","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay with cellular localization and functional ubiquitination readout","pmids":["21513986"],"is_preprint":false},{"year":2001,"finding":"Bcl10 interacts with TRAF2 and cIAPs; phosphorylation of Bcl10 regulates these interactions (phospho-Bcl10 binds cIAPs and dissociates from TRAF2); hyperphosphorylation of Bcl10 promotes apoptosis; the cIAP-binding site on Bcl10 is required for apoptosis induction.","method":"Co-immunoprecipitation, Bcl10 transgenic mice, mutagenesis, apoptosis assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple Co-IPs and mutagenesis but mechanistic interpretation is partly indirect","pmids":["11466612"],"is_preprint":false},{"year":2010,"finding":"The CARMA3-Bcl10-MALT1 signalosome links thrombin/PAR-1 (GPCR) signaling to IKK/NF-κB activation in endothelial cells; this signalosome requires β-arrestin 2 (not PDK1) for assembly, distinguishing it from the lymphocyte CARMA1 complex; Bcl10-Malt1 signaling is required for thrombin-induced monocyte-endothelial adhesion.","method":"siRNA knockdown, Co-IP, NF-κB reporter, monocyte-endothelial adhesion assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — siRNA and Co-IP with defined functional and mechanistic readouts","pmids":["21041303"],"is_preprint":false},{"year":2010,"finding":"Bcl10 links palmitate/saturated fatty acid signaling to NF-κB activation in hepatocytes via diacylglycerol-PKC axis; Bcl10-/- mice are protected from hepatic NF-κB activation and insulin resistance after high-fat diet; MALT1 is dispensable in this context, revealing a non-classical Bcl10 role.","method":"Bcl10-/- and Malt1-/- mouse models, high-fat diet experiment, NF-κB assay, insulin resistance measurement","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with in vivo metabolic phenotype and pathway dissection","pmids":["22708078"],"is_preprint":false},{"year":2021,"finding":"TRIM41 E3 ubiquitin ligase directly interacts with BCL10 and catalyzes K63-linked polyubiquitination of BCL10; this ubiquitination recruits NEMO and activates NF-κB and TBK1-IRF3 pathways during innate antiviral responses; TRIM41 deficiency impairs innate cytokine and interferon production.","method":"Co-IP, in vitro/in vivo ubiquitination assay, TRIM41-/- macrophages, viral infection models","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro ubiquitination assay identifying E3, with genetic KO and viral challenge","pmids":["33640899"],"is_preprint":false},{"year":2021,"finding":"USP12 deubiquitinase stabilizes BCL10 by removing ubiquitin chains, thereby promoting NF-κB signaling in CD4+ T cells; this regulatory mechanism is specific to CD4+ (not CD8+) T cells.","method":"Co-immunoprecipitation, deubiquitination assay, USP12-/- mice, T cell activation/differentiation assays","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP with deubiquitination assay and genetic KO","pmids":["33941870"],"is_preprint":false},{"year":2000,"finding":"BCL10 nuclear localization is specifically altered in MALT lymphomas; in normal B cells BCL10 is predominantly cytoplasmic, while in MALT lymphomas with t(1;14)(p22;q32) BCL10 is strongly expressed in both nucleus and cytoplasm, establishing subcellular mislocalization as a disease-associated mechanism.","method":"Immunohistochemistry on formalin-fixed paraffin-embedded tissues, monoclonal antibodies","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 3 — localization by IHC without full functional consequence established in this paper","pmids":["11021819"],"is_preprint":false},{"year":2009,"finding":"BCL10 is required for carrageenan-induced NF-κB activation and IL-8 production in human intestinal epithelial cells via the TLR4/MyD88/IRAK pathway; siRNA knockdown of BCL10 markedly reduces carrageenan-induced IL-8 and NF-κB activation.","method":"siRNA knockdown, NF-κB reporter, IL-8 ELISA, BCL10 western blot","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"Medium","confidence_rationale":"Tier 3 — siRNA knockdown with functional readout; replicated in multiple papers from same group","pmids":["17095757"],"is_preprint":false},{"year":2019,"finding":"Bcl10 is required for the development and suppressive function of Foxp3+ regulatory T cells; T cell-specific or Treg-specific Bcl10 deletion impairs Treg development and function, leading to lethal autoimmunity; Bcl10-deficient Tregs lose effector/suppressive gene expression and convert to IFNγ-producing proinflammatory cells.","method":"Conditional knockout (Bcl10fl/fl Foxp3cre), adoptive transfer, gene expression profiling","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific cellular phenotype and multiple functional readouts","pmids":["31595055"],"is_preprint":false}],"current_model":"BCL10 is an adaptor protein containing an N-terminal CARD domain and a C-terminal Ser/Thr-rich region that acts as a central scaffold in the CARMA1(or CARMA3)-BCL10-MALT1 (CBM) signalosome: upon antigen receptor (TCR/BCR) or GPCR stimulation, PKC-phosphorylated CARMA1 nucleates cooperative BCL10 CARD filament formation, which recruits MALT1 and TRAF6 into higher-order helical assemblies that promote K63-linked polyubiquitination of NEMO (IKKγ) via UBC13/paracaspase—activating the IKK complex and canonical NF-κB—while multiple kinases (IKKβ, CaMKII, GSK3β) and ubiquitin ligases (NEDD4/Itch, cIAP2, TRIM41) and deubiquitinases (USP9X, USP12) tightly regulate BCL10 phosphorylation, ubiquitination, and degradation to tune signal amplitude and duration; additionally, BCL10 has an NF-κB-independent role in actin remodeling and phagocytosis through delivery of OCRL phosphatase via AP1/EpsinR vesicles."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of BCL10 as a CARD-domain protein that activates NF-κB and apoptosis established the gene's dual signaling capacity and mapped functional domains: the CARD mediates NF-κB activation while the C-terminus is required for apoptosis and suppresses transformation.","evidence":"Overexpression and truncation mutagenesis in 293/MCF7 cells with NF-κB reporter, apoptosis, and transformation assays","pmids":["9989495","10319863"],"confidence":"High","gaps":["Physiological upstream signals unknown","Endogenous binding partners not identified","Mechanism linking CARD to NF-κB not defined"]},{"year":2001,"claim":"Knockout mice and interaction studies revealed that BCL10 is specifically required for antigen receptor-to-NF-κB signaling in lymphocytes, forms a complex with MALT1 to synergistically activate IKK, and is scaffolded by CARMA1 via CARD–CARD interactions — defining the core CBM signalosome.","evidence":"Bcl10−/− mice with lymphocyte stimulation assays; reciprocal Co-IP of BCL10–MALT1 and CARMA1–BCL10; NF-κB and IKK activation assays","pmids":["11163238","11262391","11356195"],"confidence":"High","gaps":["Biochemical mechanism connecting CBM to IKK activation unknown","Structural basis of CARD–CARD interaction undefined","Roles outside adaptive immunity not tested"]},{"year":2003,"claim":"The mechanism linking BCL10 to IKK was resolved: BCL10 promotes K63-linked polyubiquitination of NEMO via MALT1 paracaspase and UBC13, and this ubiquitination is required for NF-κB activation, establishing the ubiquitin-dependent signaling output of the CBM complex.","evidence":"In vitro ubiquitination assays, NEMO ubiquitination-deficient mutants, MALT1/UBC13 RNAi","pmids":["14695475"],"confidence":"High","gaps":["Ubiquitination sites on BCL10 itself not mapped","E3 ligase for BCL10 ubiquitination not identified","Higher-order assembly mechanism unknown"]},{"year":2004,"claim":"Signal termination mechanisms were identified: NEDD4 and Itch ubiquitinate BCL10 for lysosomal degradation after T-cell activation, and cIAP2 targets BCL10 for proteasomal degradation — explaining how NF-κB is attenuated and why the cIAP2-MALT1 fusion stabilizes BCL10 in MALT lymphoma.","evidence":"Proteasome/lysosome inhibitors, ubiquitin ligase overexpression, in vitro ubiquitination with cIAP2","pmids":["15082780","16395405"],"confidence":"High","gaps":["Specific ubiquitin chain types on BCL10 for degradation not determined","Relative contributions of lysosomal vs. proteasomal pathways in vivo unclear"]},{"year":2006,"claim":"Multiple negative-feedback phosphorylation events were mapped: IKKβ phosphorylates the BCL10 C-terminus to disrupt BCL10–MALT1 association, while CaMKII phosphorylates Ser138 to attenuate NF-κB — revealing phosphorylation as a multi-layered signal termination mechanism.","evidence":"In vitro kinase assays, phospho-site mutagenesis (S138A), primary T cell cytokine assays, CaMKII inhibitors/siRNA","pmids":["16818229","17052756"],"confidence":"High","gaps":["Full phosphorylation map of BCL10 not determined","Phosphatases reversing these modifications not yet identified"]},{"year":2006,"claim":"BCL10's role was extended beyond adaptive immunity: Bcl10−/− cells revealed that BCL10–MALT1 mediates NF-κB activation downstream of FcεRI in mast cells and GPCRs (LPA, endothelin-1) in non-immune cells, while remaining dispensable for degranulation, MAPK, and Akt pathways.","evidence":"Bcl10−/− and Malt1−/− mast cells, Bcl10−/− MEFs, multiple receptor agonists with pathway-specific readouts","pmids":["16432253","17095601","17179215"],"confidence":"High","gaps":["Upstream adaptor connecting GPCRs to BCL10 not defined","Whether CARMA3 is the obligate scaffold in all non-immune contexts not established"]},{"year":2007,"claim":"An NF-κB-independent function was discovered: Ser138 phosphorylation of BCL10 selectively controls TCR- and FcγR-induced actin polymerization; BCL10 knockdown impairs F-actin formation, cell spreading, and phagocytosis independently of CARMA1, separating BCL10's cytoskeletal role from its NF-κB role.","evidence":"siRNA, S138A mutagenesis, F-actin imaging, phagocytosis assays in T cells and monocytes","pmids":["17371994"],"confidence":"High","gaps":["Downstream effectors linking BCL10 phospho-S138 to actin not identified","Structural basis for NF-κB vs. actin pathway bifurcation unknown"]},{"year":2008,"claim":"BCL10's own ubiquitination sites were mapped to K31 and K63 (K63-linked chains); ubiquitinated BCL10 directly recruits NEMO via NEMO's ubiquitin-binding domain, and mutation of these sites blocks NF-κB without disrupting CBM assembly, ordering ubiquitination downstream of complex formation.","evidence":"Ubiquitination site mapping by mutagenesis (K31R/K63R), NEMO binding assay, NF-κB reporter","pmids":["18287044"],"confidence":"High","gaps":["E3 ligase catalyzing K63-linked ubiquitination of BCL10 at K31/K63 not identified in this study","Role of other ubiquitin chain types on BCL10 unclear"]},{"year":2011,"claim":"Calcineurin was identified as a phosphatase that dephosphorylates BCL10 to sustain CBM complex assembly, explaining how immunosuppressants cyclosporin A/FK506 inhibit NF-κB partly through BCL10 hyperphosphorylation.","evidence":"In vitro/in vivo phosphatase assay, cyclosporin A/FK506 treatment, calcineurin siRNA","pmids":["21199863"],"confidence":"High","gaps":["Specific BCL10 residues dephosphorylated by calcineurin not mapped","Relative importance vs. CaMKII/IKKβ phosphorylation in vivo not quantified"]},{"year":2012,"claim":"The NF-κB-independent actin-regulatory mechanism was molecularly defined: BCL10 forms a complex with clathrin adaptors AP1 and EpsinR to deliver OCRL phosphatase to phagocytic cups, controlling PI(4,5)P2 turnover and Rac1/PI3K activation during phagocytosis.","evidence":"siRNA depletion, live-cell imaging, Co-IP of BCL10 with AP1/EpsinR, phosphoinositide analysis in macrophages","pmids":["23153494"],"confidence":"High","gaps":["Whether BCL10–AP1/EpsinR complexes function outside phagocytosis unknown","Structural basis of BCL10–clathrin adaptor interaction not resolved"]},{"year":2013,"claim":"Structural reconstitution revealed the CBM signalosome as a helical filamentous assembly: substoichiometric CARMA1 nucleates cooperative BCL10 CARD filament polymerization; crystal/NMR/EM structures defined CARD–CARD interfaces essential for filament formation and MALT1 recruitment.","evidence":"In vitro reconstitution, crystallography, NMR, cryo-EM, structure-guided mutagenesis with NF-κB reporter","pmids":["24074955"],"confidence":"High","gaps":["Full-length BCL10 structure not determined","How MALT1 binds the filament at atomic resolution not resolved"]},{"year":2018,"claim":"Higher-resolution cryo-EM of BCL10 CARD filaments and imaging of CARMA1-nucleated star-shaped networks showed that MALT1 cooperatively binds and dimerizes on BCL10 filaments, while TRAF6 decorates CBM filaments to form higher-order signaling assemblies — completing the structural model of the signalosome.","evidence":"Cryo-EM at 4.0 Å, time-lapse confocal, in vitro polymerization","pmids":["29382759"],"confidence":"High","gaps":["Atomic-resolution structure of full CBM including MALT1 and TRAF6 not achieved","How filament disassembly is regulated structurally unknown"]},{"year":2019,"claim":"BCL10 was shown to be essential for regulatory T cell development and suppressive function; Treg-specific BCL10 deletion causes lethal autoimmunity with conversion of Tregs to IFNγ-producing proinflammatory cells, establishing a non-redundant role in immune tolerance.","evidence":"Conditional knockout (Bcl10fl/fl Foxp3cre), adoptive transfer, gene expression profiling","pmids":["31595055"],"confidence":"High","gaps":["Whether BCL10 acts through NF-κB alone or also actin remodeling in Tregs not dissected","Downstream NF-κB target genes in Tregs not identified"]},{"year":2021,"claim":"New E3 ligases and deubiquitinases were identified: TRIM41 catalyzes K63-linked polyubiquitination of BCL10 to activate NF-κB and TBK1-IRF3 in innate antiviral responses, while USP12 stabilizes BCL10 specifically in CD4+ T cells — expanding the regulatory ubiquitin code on BCL10.","evidence":"In vitro/in vivo ubiquitination assays, TRIM41−/− macrophages with viral infection, USP12−/− mice with T cell assays","pmids":["33640899","33941870"],"confidence":"High","gaps":["Whether TRIM41 and previously identified E3s act on overlapping or distinct BCL10 lysine residues unknown","Full deubiquitinase landscape for BCL10 not mapped"]},{"year":null,"claim":"Key unresolved questions include: the atomic-resolution structure of the complete CBM signalosome with MALT1 and TRAF6 integrated; the molecular basis for bifurcation between NF-κB and actin-regulatory pathways at BCL10; and the cell-type-specific combinatorial ubiquitin code that tunes BCL10 signal amplitude.","evidence":"","pmids":[],"confidence":"Low","gaps":["Full atomic structure of BCL10 in complex with MALT1 and TRAF6 not available","Mechanism by which phospho-S138 switches BCL10 from NF-κB to actin pathway not resolved","Comprehensive in vivo mapping of BCL10 post-translational modifications across cell types lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,3,25,30]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[25,30]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,21,27,38]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[21,38]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,3,4,10,11,16,28,36]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,5,9,36,40]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,33]}],"complexes":["CBM signalosome (CARMA1-BCL10-MALT1)","CARMA3-BCL10-MALT1","BCL10-AP1-EpsinR"],"partners":["MALT1","CARD11","CARD10","TRAF6","NEMO","OCRL","TRIM41","USP9X"],"other_free_text":[]},"mechanistic_narrative":"BCL10 is a CARD domain-containing adaptor protein that serves as the central scaffold in the CARMA–BCL10–MALT1 (CBM) signalosome, coupling antigen receptors, Fc receptors, GPCRs, and TLR4 to canonical NF-κB activation in both immune and non-immune cells [PMID:11163238, PMID:17179215, PMID:18252714]. Upon receptor engagement, PKC-phosphorylated CARMA1 (or CARMA3) nucleates cooperative BCL10 CARD filament polymerization; these filaments recruit MALT1, TRAF6, and IKK via K63-linked polyubiquitination of BCL10 (at K31/K63) and NEMO, activating the IKK complex [PMID:24074955, PMID:29382759, PMID:14695475, PMID:18287044]. Signal amplitude and duration are tightly regulated by negative-feedback phosphorylation (IKKβ, CaMKII) that promotes BCL10 ubiquitination and lysosomal degradation through NEDD4/Itch, cIAP2, and other E3 ligases, while calcineurin-mediated dephosphorylation sustains CBM assembly [PMID:16818229, PMID:17052756, PMID:15082780, PMID:16395405, PMID:21199863]. Independent of NF-κB, BCL10 regulates actin polymerization and phagocytic cup formation by delivering OCRL phosphatase via AP1/EpsinR vesicles, a function governed by Ser138 phosphorylation [PMID:17371994, PMID:23153494]."},"prefetch_data":{"uniprot":{"accession":"O95999","full_name":"B-cell lymphoma/leukemia 10","aliases":["B-cell CLL/lymphoma 10","Bcl-10","CARD-containing molecule enhancing NF-kappa-B","CARD-like apoptotic protein","hCLAP","CED-3/ICH-1 prodomain homologous E10-like regulator","CIPER","Cellular homolog of vCARMEN","cCARMEN","Cellular-E10","c-E10","Mammalian CARD-containing adapter molecule E10","mE10"],"length_aa":233,"mass_kda":26.3,"function":"Plays a key role in both adaptive and innate immune signaling by bridging CARD domain-containing proteins to immune activation (PubMed:10187770, PubMed:10364242, PubMed:10400625, PubMed:24074955, PubMed:25365219). Acts by channeling adaptive and innate immune signaling downstream of CARD domain-containing proteins CARD9, CARD11 and CARD14 to activate NF-kappa-B and MAP kinase p38 (MAPK11, MAPK12, MAPK13 and/or MAPK14) pathways which stimulate expression of genes encoding pro-inflammatory cytokines and chemokines (PubMed:24074955). Recruited by activated CARD domain-containing proteins: homooligomerized CARD domain-containing proteins form a nucleating helical template that recruits BCL10 via CARD-CARD interaction, thereby promoting polymerization of BCL10, subsequent recruitment of MALT1 and formation of a CBM complex (PubMed:24074955). This leads to activation of NF-kappa-B and MAP kinase p38 (MAPK11, MAPK12, MAPK13 and/or MAPK14) pathways which stimulate expression of genes encoding pro-inflammatory cytokines and chemokines (PubMed:18287044, PubMed:24074955, PubMed:27777308). Activated by CARD9 downstream of C-type lectin receptors; CARD9-mediated signals are essential for antifungal immunity (PubMed:26488816). Activated by CARD11 downstream of T-cell receptor (TCR) and B-cell receptor (BCR) (PubMed:18264101, PubMed:18287044, PubMed:24074955, PubMed:27777308). Promotes apoptosis, pro-caspase-9 maturation and activation of NF-kappa-B via NIK and IKK (PubMed:10187815)","subcellular_location":"Cytoplasm, perinuclear region; Membrane raft","url":"https://www.uniprot.org/uniprotkb/O95999/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BCL10","classification":"Not Classified","n_dependent_lines":24,"n_total_lines":1208,"dependency_fraction":0.019867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BCL10","total_profiled":1310},"omim":[{"mim_id":"617726","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 19; CARD19","url":"https://www.omim.org/entry/617726"},{"mim_id":"616098","title":"IMMUNODEFICIENCY 37; IMD37","url":"https://www.omim.org/entry/616098"},{"mim_id":"614798","title":"PELLINO E3 UBIQUITIN PROTEIN LIGASE 2; PELI2","url":"https://www.omim.org/entry/614798"},{"mim_id":"608382","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY A, MEMBER 3; DNAJA3","url":"https://www.omim.org/entry/608382"},{"mim_id":"607212","title":"CASPASE RECRUITMENT DOMAIN-CONTAINING PROTEIN 9; CARD9","url":"https://www.omim.org/entry/607212"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BCL10"},"hgnc":{"alias_symbol":["CARMEN","CIPER","mE10","c-E10","CLAP"],"prev_symbol":[]},"alphafold":{"accession":"O95999","domains":[{"cath_id":"1.10.533.10","chopping":"9-113","consensus_level":"high","plddt":91.3005,"start":9,"end":113}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95999","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95999-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95999-F1-predicted_aligned_error_v6.png","plddt_mean":69.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BCL10","jax_strain_url":"https://www.jax.org/strain/search?query=BCL10"},"sequence":{"accession":"O95999","fasta_url":"https://rest.uniprot.org/uniprotkb/O95999.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95999/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95999"}},"corpus_meta":[{"pmid":"9989495","id":"PMC_9989495","title":"Bcl10 is 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  \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original discovery with mutagenesis and multiple functional readouts, replicated across two independent labs (PMID:9989495 and PMID:10319863)\",\n      \"pmids\": [\"9989495\", \"10319863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"BCL10 is required for antigen receptor (TCR/BCR)-induced NF-κB activation in lymphocytes; bcl10-/- mice show severe immunodeficiency with absent antigen receptor-induced NF-κB activation, while MAPK, AP-1, Ca2+ signaling remain intact, placing BCL10 specifically in the antigen-receptor-to-NF-κB pathway.\",\n      \"method\": \"Knockout mouse model, lymphocyte stimulation assays, NF-κB activation assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with defined cellular phenotype and pathway placement, foundational paper\",\n      \"pmids\": [\"11163238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"BCL10 forms a strong complex with MALT1; BCL10 mediates oligomerization and activation of the MALT1 caspase-like domain, and together BCL10 and MALT1 synergistically activate NF-κB through the IKK complex.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter assays, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional readout; replicated in multiple subsequent studies\",\n      \"pmids\": [\"11262391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CARMA1 (Carma1) binds BCL10 via its CARD domain, induces translocation of BCL10 from the cytoplasm into perinuclear structures, causes phosphorylation of BCL10, and activates NF-κB; CARMA1 is a scaffold for the BCL10-dependent NF-κB signaling pathway in T cells.\",\n      \"method\": \"Co-immunoprecipitation, fluorescence microscopy, phosphorylation assay, NF-κB reporter assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with localization and functional data; confirmed by multiple subsequent studies\",\n      \"pmids\": [\"11356195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"BCL10 activates NF-κB through promoting lysine-63-linked polyubiquitination of NEMO (IKKγ); paracaspase (MALT1) and the ubiquitin-conjugating enzyme UBC13 are both required for BCL10-induced NEMO ubiquitination; a NEMO mutant unable to be ubiquitinated blocks BCL10-induced NF-κB activation.\",\n      \"method\": \"Ubiquitination assay, mutant NEMO rescue, siRNA knockdown of MALT1 and UBC13\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical ubiquitination assay with mutagenesis and RNAi validation\",\n      \"pmids\": [\"14695475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Bcl10 deficiency impairs development of follicular, marginal zone, and B1 B cells; Bcl10-/- follicular and marginal zone B cells fail to proliferate normally, and marginal zone B cells fail to activate NF-κB after LPS stimulation, establishing Bcl10 as essential for all mature B cell subset development.\",\n      \"method\": \"Knockout mouse model, B-cell subset analysis, proliferation assays, NF-κB activation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive knockout phenotype with multiple orthogonal readouts\",\n      \"pmids\": [\"12910267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"T-cell activation via PKC or TCR/CD28 induces Bcl10 degradation through the lysosomal pathway (not proteasome); HECT domain ubiquitin ligases NEDD4 and Itch promote ubiquitination and lysosomal degradation of Bcl10, selectively terminating IKK/NF-κB signaling as a negative feedback mechanism.\",\n      \"method\": \"Western blot, proteasome inhibitors, lysosomal localization, ubiquitin ligase overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying writers and pathway\",\n      \"pmids\": [\"15082780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"cIAP2 functions as an E3 ubiquitin ligase that ubiquitinates BCL10 and targets it for degradation, thereby inhibiting antigen receptor-mediated NF-κB activation; the cIAP2-MALT1 fusion protein lacks E3 activity, stabilizing BCL10 and promoting NF-κB in MALT lymphomas.\",\n      \"method\": \"In vitro ubiquitination assay, co-immunoprecipitation, BCL10 protein level measurement\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro ubiquitination assay with E3 identification and functional consequence\",\n      \"pmids\": [\"16395405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IKKβ is required for initial CBM complex formation and subsequently phosphorylates Bcl10 at the C terminus, interfering with Bcl10/MALT1 association and Bcl10-mediated IKKγ ubiquitination; IKKβ-mediated phosphorylation of Bcl10 thus exerts negative feedback on T cell NF-κB activation.\",\n      \"method\": \"Kinase assay, co-immunoprecipitation, phosphorylation site mutants, primary T cell cytokine assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay with site-specific mutagenesis and functional primary T cell readout\",\n      \"pmids\": [\"16818229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Bcl10 and Malt1 are essential for FcεRI-induced NF-κB activation and pro-inflammatory cytokine production in mast cells but are dispensable for degranulation and leukotriene secretion, demonstrating that Bcl10/Malt1 selectively uncouple NF-κB-dependent cytokine production from other mast cell responses.\",\n      \"method\": \"Knockout mouse model (Bcl10-/- and Malt1-/-), mast cell activation assays, NF-κB assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with clean cellular phenotype and specific readouts\",\n      \"pmids\": [\"16432253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Bcl10 and Malt1 are required for lysophosphatidic acid (LPA)-induced NF-κB activation in non-immune cells (MEFs); Bcl10 cooperates with PKC for LPA-induced NF-κB but is dispensable for JNK, p38, ERK, and Akt activation, establishing a GPCR-triggered NF-κB pathway through Bcl10/Malt1.\",\n      \"method\": \"Knockout MEFs, NF-κB activation assays, cytokine measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined pathway specificity using orthogonal signaling readouts\",\n      \"pmids\": [\"17095601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Bcl10 is required for NF-κB activation induced by G protein-coupled receptors (GPCRs) in non-lymphoid cells; Bcl10 deficiency blocks NF-κB activation by constitutively active Gα or stimulation with LPA or endothelin-1, but not by TNF-α, LPS, or integrin stimulation.\",\n      \"method\": \"Bcl10-/- cells, constitutively active G protein constructs, specific NF-κB activation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic evidence with multiple receptor stimuli tested\",\n      \"pmids\": [\"17179215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CaMKII phosphorylates Bcl10 on Ser138; S138A mutation prolongs Bcl10-induced NF-κB activation, indicating phosphorylation at this site attenuates NF-κB activation as a negative regulatory mechanism.\",\n      \"method\": \"In vitro kinase assay, CaMKII inhibitor (KN93), CaMKII siRNA, S138A mutagenesis, NF-κB reporter assay\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with site-specific mutagenesis and functional validation\",\n      \"pmids\": [\"17052756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Bcl10 is rapidly phosphorylated upon T cell activation; Ser138 is a key phosphorylation residue; a S138A phosphorylation-deficient mutant specifically inhibits TCR-induced actin polymerization without affecting NF-κB activation; Bcl10 silencing (but not Carma1 silencing) impairs TCR-induced F-actin formation, cell spreading, and conjugate formation, and also FcγR-induced actin polymerization and phagocytosis in monocytes.\",\n      \"method\": \"siRNA knockdown, phospho-site mutagenesis, F-actin imaging, phagocytosis assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with multiple orthogonal functional readouts separating NF-κB from actin roles\",\n      \"pmids\": [\"17371994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Phosphorylation of Bcl10 at S138 promotes ubiquitination and subsequent degradation of Bcl10, downregulating Bcl10 protein levels and negatively regulating TCR-mediated NF-κB activation; S138A mutant shows impaired ubiquitination, reduced degradation, and prolonged NF-κB activation with enhanced IL-2 production.\",\n      \"method\": \"TCR stimulation of T cells, phospho-site mutation (S138A), ubiquitination assay, NF-κB reporter, IL-2 ELISA\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — site-specific mutagenesis linking phosphorylation to ubiquitination and functional outcome\",\n      \"pmids\": [\"17502353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PKCβ phosphorylates CARMA1 on Ser668, which is essential for BCR-mediated CARMA1-Bcl10-MALT1 association and IKK activation; downstream IKKβ further facilitates CBM complex formation through positive feedback phosphorylation of CARMA1.\",\n      \"method\": \"Phosphorylation site mutagenesis, co-immunoprecipitation, IKK activation assay in B cells\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — site-specific mutagenesis with functional Co-IP and IKK readout\",\n      \"pmids\": [\"18086859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Bcl10 undergoes K63-linked polyubiquitination at K31 and K63 in response to T cell activation; ubiquitinated Bcl10 binds NEMO via NEMO's ubiquitin-binding activity; mutation of K31/K63 prevents ubiquitination, NEMO binding, and NF-κB activation without affecting CBM complex assembly.\",\n      \"method\": \"Ubiquitination mapping, site-directed mutagenesis (K31R/K63R), NEMO binding assay, NF-κB activation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ubiquitination site mapping with mutagenesis and defined functional consequence\",\n      \"pmids\": [\"18287044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BCL10 mediates TLR4/LPS-induced NF-κB activation in intestinal epithelial cells through a MyD88-dependent pathway; TLR4 blocking antibody or siRNA reduces BCL10 and IL-8 induction, and Bcl10 is recruited to TLR4 signaling complexes.\",\n      \"method\": \"TLR4 blocking antibody, TLR4 siRNA, dominant-negative MyD88, fluorescence-tagged carrageenan binding, Bcl10 siRNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple knockdown approaches in human cells but no in vitro reconstitution\",\n      \"pmids\": [\"18252714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The CARMA3-Bcl10-MALT1 (CBM) complex mediates CXCL8/IL-8-induced NF-κB activation and VEGF upregulation in endothelial cells downstream of CXCR2; knockdown of Carma3, Bcl10, or MALT1 inhibits this pathway.\",\n      \"method\": \"siRNA knockdown of CBM components, NF-κB reporter, VEGF ELISA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — siRNA knockdown with multiple readouts but no reconstitution\",\n      \"pmids\": [\"19112107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Multiple protein domains mediate Bcl10-MALT1 interaction: residues Asp80 and Glu84 of helix 5 of the Bcl10 CARD directly contact MALT1; the MALT1 death domain also contributes to the interaction; the 13-aa region downstream of the Bcl10 CARD interacts with MALT1 Ig-like domains.\",\n      \"method\": \"Co-immunoprecipitation, FRET in T cells, molecular modeling, point mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — FRET plus mutagenesis with multiple orthogonal methods\",\n      \"pmids\": [\"18806265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"BCL10 mediates LPS/TLR4-induced NF-κB activation via interaction with Pellino2; IRAK-1 acts as the upstream adaptor recruiting BCL10 to the TLR4 complex; BCL10-MALT1-TRAF6-TAK1 cascade transduces the signal; BCL10 oligomerization is required for this function; SOCS3 negatively regulates BCL10 in this pathway.\",\n      \"method\": \"Co-immunoprecipitation, BCL10-deficient macrophage line, NF-κB assay, SOCS3 overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP with functional cell-line KO and multiple pathway components tested\",\n      \"pmids\": [\"15213237\", \"16831874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MALT1 contains nuclear export signals (NES) and regulates cytoplasmic localization of BCL10; MALT1 is involved in nuclear export of BCL10 in an NES-dependent manner, as demonstrated by leptomycin B treatment; this explains nuclear BCL10 in t(1;14) and t(11;18) MALT lymphomas.\",\n      \"method\": \"NES deletion mutants, leptomycin B treatment, subcellular fractionation/immunofluorescence\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined localization mechanism with mutant analysis and pharmacological inhibition\",\n      \"pmids\": [\"16123224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The calcium-dependent phosphatase calcineurin positively regulates CBM complex formation by dephosphorylating Bcl10; calcineurin interacts with the CBM complex; inhibition by cyclosporin A or FK506 or calcineurin siRNA impairs CBM assembly and TCR-induced NF-κB activation, correlating with Bcl10 hyperphosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, in vivo and in vitro phosphatase assay, cyclosporin A/FK506, calcineurin siRNA, NF-κB reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro and in vivo dephosphorylation assays with pharmacological and genetic validation\",\n      \"pmids\": [\"21199863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MIB2 E3 ubiquitin ligase is a novel component of the activated BCL10 complex; MIB2 directly interacts with BCL10, promotes autoubiquitination and ubiquitination of IKKγ/NEMO, and recruits/activates TAK1; MIB2 knockdown inhibits BCL10-dependent NF-κB activation.\",\n      \"method\": \"Proteomic pulldown, in vitro translation/pulldown, overexpression, siRNA knockdown, NF-κB reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — pulldown with functional validation by knockdown\",\n      \"pmids\": [\"21896478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bcl10 regulates actin dynamics and membrane remodeling downstream of FcγR in macrophages in an NF-κB-independent manner; Bcl10 depletion impairs Rac1 and PI3K activation, leads to abortive phagocytic cup with excess PI(4,5)P2, Cdc42, and F-actin; Bcl10 forms a complex with clathrin adaptors AP1 and EpsinR and is required to deliver OCRL phosphatase locally.\",\n      \"method\": \"siRNA depletion, live-cell imaging, phagocytosis assay, Co-IP, PI analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing NF-κB-independent actin regulatory role\",\n      \"pmids\": [\"23153494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The reconstituted CBM signalosome is a helical filamentous assembly; substoichiometric CARMA1 nucleates Bcl10 CARD filament formation in a highly cooperative process; the Bcl10 CARD filament structure was determined by crystallography, NMR, and EM; structure-guided mutagenesis confirmed interfaces for Bcl10 filament assembly and MALT1 activation.\",\n      \"method\": \"Reconstitution, cryo-EM, crystallography, NMR, electron microscopy, site-directed mutagenesis, NF-κB reporter assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution, structure by multiple methods, and mutagenesis validation\",\n      \"pmids\": [\"24074955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USP9X deubiquitinating enzyme interacts with Bcl10 and removes TCR-induced ubiquitin chains from Bcl10, facilitating association of CARMA1 with the Bcl10-Malt1 sub-complex; USP9X knockdown attenuates NF-κB activation and T cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, USP9X knockdown, NF-κB activation assay, T cell proliferation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP and knockdown with defined mechanistic role\",\n      \"pmids\": [\"23690623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TCR signals to NF-κB are transmitted via a cytosolic p62-Bcl10-Malt1-IKK signalosome; p62 is required for Bcl10-Malt1 clustering; IKK is recruited to and activated within this signalosome; TAK1 and IKK activities are required for IKK phosphorylation but not signalosome assembly, ordering the pathway.\",\n      \"method\": \"Biochemical fractionation, confocal imaging, p62-/- T cells, kinase inhibitors, Co-IP\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological evidence with defined pathway ordering\",\n      \"pmids\": [\"24825920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Constitutively active CARD11 L225LI associates with BCL10 and MALT1 to simultaneously activate NF-κB and JNK; genetic deficiency of BCL10 or MALT1 completely rescues lymphoproliferation in CARD11 gain-of-function mice, demonstrating BCL10 is essential downstream of oncogenic CARD11 for both NF-κB and JNK activation.\",\n      \"method\": \"Conditional knock-in mouse, BCL10/MALT1 knockout rescue epistasis, JNK inhibitor\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with complete rescue phenotype\",\n      \"pmids\": [\"26668357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CARD14 psoriasis mutants (E138A, G117S) constitutively interact with BCL10 and MALT1 and trigger BCL10- and MALT1-dependent NF-κB activation in keratinocytes by disrupting the autoinhibitory effect of the CARD14 linker region on BCL10 binding; CARD14 E138A also stimulates MALT1 paracaspase activity.\",\n      \"method\": \"Co-immunoprecipitation, NF-κB reporter, MALT1 paracaspase activity assay, siRNA knockdown\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple assays defining mechanism with mutagenesis and enzymatic readout\",\n      \"pmids\": [\"27071417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of the BCL10 CARD filament at 4.0 Å reveals the CARD-CARD interaction interfaces; CARMA1 serves as a hub for star-shaped filamentous BCL10 networks and decreases BCL10 polymerization lag; MALT1 cooperatively binds BCL10 filaments and immediately dimerizes; TRAF6 cooperatively decorates CBM filaments to form higher-order assemblies.\",\n      \"method\": \"Cryo-EM structure determination, time-lapse confocal imaging, in vitro polymerization assay, EM\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with biochemical and live-cell imaging validation\",\n      \"pmids\": [\"29382759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GSK3β phosphorylates BCL10 and is required for CBM complex formation; pharmacological inhibition or RNAi knockdown of GSK3β reduces BCL10 phosphorylation, CBM complex formation, MALT1-catalyzed cleavage of BCL10/RelB/CYLD, IκBα degradation, and NF-κB activation in activated T cells.\",\n      \"method\": \"GSK3β inhibitors, siRNA, phosphorylation assay, Co-IP, NF-κB reporter, MALT1 cleavage assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple assays with pharmacological and genetic tools but single lab\",\n      \"pmids\": [\"29358699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CaMKII is recruited to the immunological synapse where it interacts with and phosphorylates the Bcl10 CARD domain; this phosphorylation regulates interactions within the Carma1-Bcl10-Malt1 complex and the TCR-induced ubiquitinations of Bcl10 and IKKγ.\",\n      \"method\": \"Immunological synapse imaging, co-immunoprecipitation, in vitro kinase assay, ubiquitination assay\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay with cellular localization and functional ubiquitination readout\",\n      \"pmids\": [\"21513986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Bcl10 interacts with TRAF2 and cIAPs; phosphorylation of Bcl10 regulates these interactions (phospho-Bcl10 binds cIAPs and dissociates from TRAF2); hyperphosphorylation of Bcl10 promotes apoptosis; the cIAP-binding site on Bcl10 is required for apoptosis induction.\",\n      \"method\": \"Co-immunoprecipitation, Bcl10 transgenic mice, mutagenesis, apoptosis assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple Co-IPs and mutagenesis but mechanistic interpretation is partly indirect\",\n      \"pmids\": [\"11466612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The CARMA3-Bcl10-MALT1 signalosome links thrombin/PAR-1 (GPCR) signaling to IKK/NF-κB activation in endothelial cells; this signalosome requires β-arrestin 2 (not PDK1) for assembly, distinguishing it from the lymphocyte CARMA1 complex; Bcl10-Malt1 signaling is required for thrombin-induced monocyte-endothelial adhesion.\",\n      \"method\": \"siRNA knockdown, Co-IP, NF-κB reporter, monocyte-endothelial adhesion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — siRNA and Co-IP with defined functional and mechanistic readouts\",\n      \"pmids\": [\"21041303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bcl10 links palmitate/saturated fatty acid signaling to NF-κB activation in hepatocytes via diacylglycerol-PKC axis; Bcl10-/- mice are protected from hepatic NF-κB activation and insulin resistance after high-fat diet; MALT1 is dispensable in this context, revealing a non-classical Bcl10 role.\",\n      \"method\": \"Bcl10-/- and Malt1-/- mouse models, high-fat diet experiment, NF-κB assay, insulin resistance measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with in vivo metabolic phenotype and pathway dissection\",\n      \"pmids\": [\"22708078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM41 E3 ubiquitin ligase directly interacts with BCL10 and catalyzes K63-linked polyubiquitination of BCL10; this ubiquitination recruits NEMO and activates NF-κB and TBK1-IRF3 pathways during innate antiviral responses; TRIM41 deficiency impairs innate cytokine and interferon production.\",\n      \"method\": \"Co-IP, in vitro/in vivo ubiquitination assay, TRIM41-/- macrophages, viral infection models\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro ubiquitination assay identifying E3, with genetic KO and viral challenge\",\n      \"pmids\": [\"33640899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"USP12 deubiquitinase stabilizes BCL10 by removing ubiquitin chains, thereby promoting NF-κB signaling in CD4+ T cells; this regulatory mechanism is specific to CD4+ (not CD8+) T cells.\",\n      \"method\": \"Co-immunoprecipitation, deubiquitination assay, USP12-/- mice, T cell activation/differentiation assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP with deubiquitination assay and genetic KO\",\n      \"pmids\": [\"33941870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"BCL10 nuclear localization is specifically altered in MALT lymphomas; in normal B cells BCL10 is predominantly cytoplasmic, while in MALT lymphomas with t(1;14)(p22;q32) BCL10 is strongly expressed in both nucleus and cytoplasm, establishing subcellular mislocalization as a disease-associated mechanism.\",\n      \"method\": \"Immunohistochemistry on formalin-fixed paraffin-embedded tissues, monoclonal antibodies\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization by IHC without full functional consequence established in this paper\",\n      \"pmids\": [\"11021819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BCL10 is required for carrageenan-induced NF-κB activation and IL-8 production in human intestinal epithelial cells via the TLR4/MyD88/IRAK pathway; siRNA knockdown of BCL10 markedly reduces carrageenan-induced IL-8 and NF-κB activation.\",\n      \"method\": \"siRNA knockdown, NF-κB reporter, IL-8 ELISA, BCL10 western blot\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — siRNA knockdown with functional readout; replicated in multiple papers from same group\",\n      \"pmids\": [\"17095757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bcl10 is required for the development and suppressive function of Foxp3+ regulatory T cells; T cell-specific or Treg-specific Bcl10 deletion impairs Treg development and function, leading to lethal autoimmunity; Bcl10-deficient Tregs lose effector/suppressive gene expression and convert to IFNγ-producing proinflammatory cells.\",\n      \"method\": \"Conditional knockout (Bcl10fl/fl Foxp3cre), adoptive transfer, gene expression profiling\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific cellular phenotype and multiple functional readouts\",\n      \"pmids\": [\"31595055\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BCL10 is an adaptor protein containing an N-terminal CARD domain and a C-terminal Ser/Thr-rich region that acts as a central scaffold in the CARMA1(or CARMA3)-BCL10-MALT1 (CBM) signalosome: upon antigen receptor (TCR/BCR) or GPCR stimulation, PKC-phosphorylated CARMA1 nucleates cooperative BCL10 CARD filament formation, which recruits MALT1 and TRAF6 into higher-order helical assemblies that promote K63-linked polyubiquitination of NEMO (IKKγ) via UBC13/paracaspase—activating the IKK complex and canonical NF-κB—while multiple kinases (IKKβ, CaMKII, GSK3β) and ubiquitin ligases (NEDD4/Itch, cIAP2, TRIM41) and deubiquitinases (USP9X, USP12) tightly regulate BCL10 phosphorylation, ubiquitination, and degradation to tune signal amplitude and duration; additionally, BCL10 has an NF-κB-independent role in actin remodeling and phagocytosis through delivery of OCRL phosphatase via AP1/EpsinR vesicles.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"BCL10 is a CARD domain-containing adaptor protein that serves as the central scaffold in the CARMA–BCL10–MALT1 (CBM) signalosome, coupling antigen receptors, Fc receptors, GPCRs, and TLR4 to canonical NF-κB activation in both immune and non-immune cells [PMID:11163238, PMID:17179215, PMID:18252714]. Upon receptor engagement, PKC-phosphorylated CARMA1 (or CARMA3) nucleates cooperative BCL10 CARD filament polymerization; these filaments recruit MALT1, TRAF6, and IKK via K63-linked polyubiquitination of BCL10 (at K31/K63) and NEMO, activating the IKK complex [PMID:24074955, PMID:29382759, PMID:14695475, PMID:18287044]. Signal amplitude and duration are tightly regulated by negative-feedback phosphorylation (IKKβ, CaMKII) that promotes BCL10 ubiquitination and lysosomal degradation through NEDD4/Itch, cIAP2, and other E3 ligases, while calcineurin-mediated dephosphorylation sustains CBM assembly [PMID:16818229, PMID:17052756, PMID:15082780, PMID:16395405, PMID:21199863]. Independent of NF-κB, BCL10 regulates actin polymerization and phagocytic cup formation by delivering OCRL phosphatase via AP1/EpsinR vesicles, a function governed by Ser138 phosphorylation [PMID:17371994, PMID:23153494].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of BCL10 as a CARD-domain protein that activates NF-κB and apoptosis established the gene's dual signaling capacity and mapped functional domains: the CARD mediates NF-κB activation while the C-terminus is required for apoptosis and suppresses transformation.\",\n      \"evidence\": \"Overexpression and truncation mutagenesis in 293/MCF7 cells with NF-κB reporter, apoptosis, and transformation assays\",\n      \"pmids\": [\"9989495\", \"10319863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological upstream signals unknown\", \"Endogenous binding partners not identified\", \"Mechanism linking CARD to NF-κB not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Knockout mice and interaction studies revealed that BCL10 is specifically required for antigen receptor-to-NF-κB signaling in lymphocytes, forms a complex with MALT1 to synergistically activate IKK, and is scaffolded by CARMA1 via CARD–CARD interactions — defining the core CBM signalosome.\",\n      \"evidence\": \"Bcl10−/− mice with lymphocyte stimulation assays; reciprocal Co-IP of BCL10–MALT1 and CARMA1–BCL10; NF-κB and IKK activation assays\",\n      \"pmids\": [\"11163238\", \"11262391\", \"11356195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism connecting CBM to IKK activation unknown\", \"Structural basis of CARD–CARD interaction undefined\", \"Roles outside adaptive immunity not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The mechanism linking BCL10 to IKK was resolved: BCL10 promotes K63-linked polyubiquitination of NEMO via MALT1 paracaspase and UBC13, and this ubiquitination is required for NF-κB activation, establishing the ubiquitin-dependent signaling output of the CBM complex.\",\n      \"evidence\": \"In vitro ubiquitination assays, NEMO ubiquitination-deficient mutants, MALT1/UBC13 RNAi\",\n      \"pmids\": [\"14695475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination sites on BCL10 itself not mapped\", \"E3 ligase for BCL10 ubiquitination not identified\", \"Higher-order assembly mechanism unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Signal termination mechanisms were identified: NEDD4 and Itch ubiquitinate BCL10 for lysosomal degradation after T-cell activation, and cIAP2 targets BCL10 for proteasomal degradation — explaining how NF-κB is attenuated and why the cIAP2-MALT1 fusion stabilizes BCL10 in MALT lymphoma.\",\n      \"evidence\": \"Proteasome/lysosome inhibitors, ubiquitin ligase overexpression, in vitro ubiquitination with cIAP2\",\n      \"pmids\": [\"15082780\", \"16395405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ubiquitin chain types on BCL10 for degradation not determined\", \"Relative contributions of lysosomal vs. proteasomal pathways in vivo unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Multiple negative-feedback phosphorylation events were mapped: IKKβ phosphorylates the BCL10 C-terminus to disrupt BCL10–MALT1 association, while CaMKII phosphorylates Ser138 to attenuate NF-κB — revealing phosphorylation as a multi-layered signal termination mechanism.\",\n      \"evidence\": \"In vitro kinase assays, phospho-site mutagenesis (S138A), primary T cell cytokine assays, CaMKII inhibitors/siRNA\",\n      \"pmids\": [\"16818229\", \"17052756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full phosphorylation map of BCL10 not determined\", \"Phosphatases reversing these modifications not yet identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"BCL10's role was extended beyond adaptive immunity: Bcl10−/− cells revealed that BCL10–MALT1 mediates NF-κB activation downstream of FcεRI in mast cells and GPCRs (LPA, endothelin-1) in non-immune cells, while remaining dispensable for degranulation, MAPK, and Akt pathways.\",\n      \"evidence\": \"Bcl10−/− and Malt1−/− mast cells, Bcl10−/− MEFs, multiple receptor agonists with pathway-specific readouts\",\n      \"pmids\": [\"16432253\", \"17095601\", \"17179215\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream adaptor connecting GPCRs to BCL10 not defined\", \"Whether CARMA3 is the obligate scaffold in all non-immune contexts not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"An NF-κB-independent function was discovered: Ser138 phosphorylation of BCL10 selectively controls TCR- and FcγR-induced actin polymerization; BCL10 knockdown impairs F-actin formation, cell spreading, and phagocytosis independently of CARMA1, separating BCL10's cytoskeletal role from its NF-κB role.\",\n      \"evidence\": \"siRNA, S138A mutagenesis, F-actin imaging, phagocytosis assays in T cells and monocytes\",\n      \"pmids\": [\"17371994\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors linking BCL10 phospho-S138 to actin not identified\", \"Structural basis for NF-κB vs. actin pathway bifurcation unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"BCL10's own ubiquitination sites were mapped to K31 and K63 (K63-linked chains); ubiquitinated BCL10 directly recruits NEMO via NEMO's ubiquitin-binding domain, and mutation of these sites blocks NF-κB without disrupting CBM assembly, ordering ubiquitination downstream of complex formation.\",\n      \"evidence\": \"Ubiquitination site mapping by mutagenesis (K31R/K63R), NEMO binding assay, NF-κB reporter\",\n      \"pmids\": [\"18287044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase catalyzing K63-linked ubiquitination of BCL10 at K31/K63 not identified in this study\", \"Role of other ubiquitin chain types on BCL10 unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Calcineurin was identified as a phosphatase that dephosphorylates BCL10 to sustain CBM complex assembly, explaining how immunosuppressants cyclosporin A/FK506 inhibit NF-κB partly through BCL10 hyperphosphorylation.\",\n      \"evidence\": \"In vitro/in vivo phosphatase assay, cyclosporin A/FK506 treatment, calcineurin siRNA\",\n      \"pmids\": [\"21199863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific BCL10 residues dephosphorylated by calcineurin not mapped\", \"Relative importance vs. CaMKII/IKKβ phosphorylation in vivo not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The NF-κB-independent actin-regulatory mechanism was molecularly defined: BCL10 forms a complex with clathrin adaptors AP1 and EpsinR to deliver OCRL phosphatase to phagocytic cups, controlling PI(4,5)P2 turnover and Rac1/PI3K activation during phagocytosis.\",\n      \"evidence\": \"siRNA depletion, live-cell imaging, Co-IP of BCL10 with AP1/EpsinR, phosphoinositide analysis in macrophages\",\n      \"pmids\": [\"23153494\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BCL10–AP1/EpsinR complexes function outside phagocytosis unknown\", \"Structural basis of BCL10–clathrin adaptor interaction not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Structural reconstitution revealed the CBM signalosome as a helical filamentous assembly: substoichiometric CARMA1 nucleates cooperative BCL10 CARD filament polymerization; crystal/NMR/EM structures defined CARD–CARD interfaces essential for filament formation and MALT1 recruitment.\",\n      \"evidence\": \"In vitro reconstitution, crystallography, NMR, cryo-EM, structure-guided mutagenesis with NF-κB reporter\",\n      \"pmids\": [\"24074955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length BCL10 structure not determined\", \"How MALT1 binds the filament at atomic resolution not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Higher-resolution cryo-EM of BCL10 CARD filaments and imaging of CARMA1-nucleated star-shaped networks showed that MALT1 cooperatively binds and dimerizes on BCL10 filaments, while TRAF6 decorates CBM filaments to form higher-order signaling assemblies — completing the structural model of the signalosome.\",\n      \"evidence\": \"Cryo-EM at 4.0 Å, time-lapse confocal, in vitro polymerization\",\n      \"pmids\": [\"29382759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of full CBM including MALT1 and TRAF6 not achieved\", \"How filament disassembly is regulated structurally unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"BCL10 was shown to be essential for regulatory T cell development and suppressive function; Treg-specific BCL10 deletion causes lethal autoimmunity with conversion of Tregs to IFNγ-producing proinflammatory cells, establishing a non-redundant role in immune tolerance.\",\n      \"evidence\": \"Conditional knockout (Bcl10fl/fl Foxp3cre), adoptive transfer, gene expression profiling\",\n      \"pmids\": [\"31595055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BCL10 acts through NF-κB alone or also actin remodeling in Tregs not dissected\", \"Downstream NF-κB target genes in Tregs not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"New E3 ligases and deubiquitinases were identified: TRIM41 catalyzes K63-linked polyubiquitination of BCL10 to activate NF-κB and TBK1-IRF3 in innate antiviral responses, while USP12 stabilizes BCL10 specifically in CD4+ T cells — expanding the regulatory ubiquitin code on BCL10.\",\n      \"evidence\": \"In vitro/in vivo ubiquitination assays, TRIM41−/− macrophages with viral infection, USP12−/− mice with T cell assays\",\n      \"pmids\": [\"33640899\", \"33941870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRIM41 and previously identified E3s act on overlapping or distinct BCL10 lysine residues unknown\", \"Full deubiquitinase landscape for BCL10 not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the atomic-resolution structure of the complete CBM signalosome with MALT1 and TRAF6 integrated; the molecular basis for bifurcation between NF-κB and actin-regulatory pathways at BCL10; and the cell-type-specific combinatorial ubiquitin code that tunes BCL10 signal amplitude.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Full atomic structure of BCL10 in complex with MALT1 and TRAF6 not available\", \"Mechanism by which phospho-S138 switches BCL10 from NF-κB to actin pathway not resolved\", \"Comprehensive in vivo mapping of BCL10 post-translational modifications across cell types lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 3, 25, 30]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [25, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 21, 27, 38]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [21, 38]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 10, 11, 16, 28, 36]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 5, 9, 36, 40]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 33]}\n    ],\n    \"complexes\": [\n      \"CBM signalosome (CARMA1-BCL10-MALT1)\",\n      \"CARMA3-BCL10-MALT1\",\n      \"BCL10-AP1-EpsinR\"\n    ],\n    \"partners\": [\n      \"MALT1\",\n      \"CARD11\",\n      \"CARD10\",\n      \"TRAF6\",\n      \"NEMO\",\n      \"OCRL\",\n      \"TRIM41\",\n      \"USP9X\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}