{"gene":"TLR3","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2002,"finding":"TLR3 and TLR4, but not TLR2 or TLR9, activate IRF3, which mediates a specific antiviral gene program including IFN-β induction; IRF3 confers TLR3/TLR4 specificity and selectively inhibits viral replication.","method":"Genetic loss-of-function, gene expression profiling, pathway epistasis in macrophages/fibroblasts","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (gene KO, expression arrays, functional viral replication assay), replicated across TLR3 and TLR4 contexts in same study","pmids":["12354379"],"is_preprint":false},{"year":2004,"finding":"dsRNA-activated phosphorylation of two specific tyrosine residues of TLR3 is essential for initiating two distinct signaling pathways: one activating TBK-1 (leading to IRF-3 Ser/Thr phosphorylation) and one recruiting and activating PI3 kinase/Akt (required for full IRF-3 phosphorylation and target gene promoter binding). Without PI3K recruitment to TLR3, IRF-3 is only partially phosphorylated and fails to bind target gene promoters.","method":"Tyrosine phosphorylation site mutagenesis, PI3K inhibition, in vitro signaling assays, promoter binding assays","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis plus in vitro kinase/signaling assays with multiple orthogonal readouts in a single focused study","pmids":["15502848"],"is_preprint":false},{"year":2008,"finding":"TLR3 mediates sequence- and target-independent suppression of choroidal neovascularization by extracellular siRNAs (≥21 nt) acting on the cell surface. This requires TLR3 and its adaptor TRIF, and induces IFN-γ and IL-12. A minimum siRNA length of 21 nucleotides is required, consistent with a modeled 2:1 TLR3-RNA complex. The TLR3 coding variant 412FF renders endothelial cells refractory to extracellular siRNA-induced cytotoxicity.","method":"Mouse CNV models, siRNA length-series experiments, TLR3-deficient mice, TRIF-deficient mice, cell-surface TLR3 detection, pharmacogenetic variant analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic knockouts, pharmacogenetic variant, multiple in vivo models, consistent mechanism across orthogonal methods","pmids":["18368052"],"is_preprint":false},{"year":2009,"finding":"21-nt siRNA activates cell-surface TLR3 on lymphatic endothelial cells (phosphorylation of surface TLR3 demonstrated), induces apoptosis, and suppresses both hemangiogenesis and lymphangiogenesis in mouse models. A 7-nt siRNA too short to activate TLR3 has no such effect. siRNA is not internalized unless cell-permeating moieties are used.","method":"Mouse corneal suture and hindlimb ischemia neovascularization models, TLR3 phosphorylation assays, siRNA internalization controls, apoptosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple in vivo models, direct TLR3 phosphorylation readout, length-control experiments, consistent with companion Nature paper","pmids":["19359485"],"is_preprint":false},{"year":2012,"finding":"UVB-damaged self noncoding RNA (e.g., UVB-irradiated U1 RNA) is recognized by TLR3 (and adaptor TRIF) to induce TNF-α and IL-6 from keratinocytes and PBMCs. Tlr3-/- mice fail to upregulate TNF-α in skin after UVB exposure and lack UVB-induced immune suppression, establishing TLR3 as a sensor of UV-damaged self-RNA acting as a DAMP.","method":"TLR3 KO mice, purified noncoding RNA stimulation, whole-transcriptome sequencing, TRIF-deficient cells, in vivo UVB model","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — TLR3 KO and TRIF KO genetic validation, purified RNA reconstitution, multiple orthogonal in vitro and in vivo readouts","pmids":["22772463"],"is_preprint":false},{"year":2012,"finding":"A TRIF-independent branch of TLR3 signaling, mediated by the proto-oncoprotein c-Src (which binds TLR3 after dsRNA stimulation), controls cell migration, adhesion, and proliferation in a biphasic manner: immediate increase in motility via Src phosphorylation/activation, followed by strong inhibition via Src sequestration in lipid rafts. MyD88 is also not required for this pathway.","method":"dsRNA stimulation, Src binding to TLR3 (co-IP), lipid raft fractionation, TLR3/TRIF/MyD88-deficient cells, cell migration and adhesion assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct TLR3-Src interaction (co-IP), genetic pathway dissection with TRIF/MyD88 KO, multiple cellular readouts in single focused study","pmids":["22323545"],"is_preprint":false},{"year":2014,"finding":"The N-terminal TLR3 ectodomain fragment (TLR3N, cleaved by cathepsins in endolysosomes starting at 343S) remains associated with the C-terminal fragment (TLR3C); both are required for dsRNA-induced activation of IFN-β and NF-κB promoters. Cell-surface TLR3 is highly expressed on splenic CD8+ DCs and marginal zone B cells in a UNC93B1-dependent manner.","method":"Cleavage site mapping, promoter activation assays with TLR3N/C domain deletion mutants, new monoclonal antibodies to mouse TLR3, flow cytometry, UNC93B1-deficient cells","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis/domain deletion with functional readout, cleavage site biochemistry, genetic (UNC93B1 KO) validation, single focused study with multiple methods","pmids":["25305318"],"is_preprint":false},{"year":2014,"finding":"WDFY1 (WD repeat and FYVE domain-containing protein) is a crucial adaptor that interacts with TLR3 and TLR4 and mediates the recruitment of TRIF to these receptors. WDFY1 overexpression potentiates TLR3/4-mediated NF-κB, IRF3 activation and type I IFN production; WDFY1 depletion has the opposite effect.","method":"Co-immunoprecipitation, overexpression/knockdown, NF-κB/IRF3 reporter assays, cytokine ELISA","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and functional gain/loss-of-function, single lab, two orthogonal methods","pmids":["25736436"],"is_preprint":false},{"year":2015,"finding":"ZCCHC3 promotes TLR3-mediated signaling by facilitating the recruitment of TRIF to TLR3 after poly(I:C) stimulation. ZCCHC3 deficiency specifically inhibits TLR3- but not TLR4-mediated type I IFN and proinflammatory cytokine induction; Zcchc3-/- mice are more resistant to poly(I:C)-induced inflammatory death.","method":"Co-immunoprecipitation, overexpression/KO cells, Zcchc3-/- mice, cytokine assays","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus KO mouse phenotype plus reporter assay, single lab","pmids":["32133501"],"is_preprint":false},{"year":2019,"finding":"ZFYVE1 (zinc-finger FYVE domain-containing protein, a guanylate-binding protein) interacts with TLR3 via its FYVE domain (binding the TLR3 ectodomain) and enhances TLR3 ligand (poly(I:C)) binding affinity, positively regulating TLR3-mediated antiviral signaling. Zfyve1-/- mice are less susceptible to poly(I:C)-induced inflammatory death.","method":"Co-IP, domain mapping, ligand-binding affinity assay, KO mice, gene expression assays","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mapping plus in vivo KO phenotype, single lab","pmids":["31388100"],"is_preprint":false},{"year":2015,"finding":"S100A9 is required for maturation of TLR3-containing early endosomes (EE) into late endosomes (LE), enabling TLR3 to colocalize with and sense dsRNA ligands. S100A9 interacts with TLR3 following poly(I:C) treatment; in S100A9-KO macrophages, TLR3 cannot be detected in LE and fails to colocalize with poly(I:C), resulting in dramatically reduced cytokine production.","method":"S100A9 KO macrophages, co-localization microscopy, co-immunoprecipitation, endosomal fractionation, in vivo poly(I:C) challenge","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO cells and mice, co-IP interaction, colocalization by microscopy, multiple orthogonal readouts demonstrating trafficking mechanism","pmids":["26385519"],"is_preprint":false},{"year":2014,"finding":"The ectodomain of TLR3 (not its transmembrane segment or cytosolic domain) is required for plasma membrane localization. UNC93B1 promotes TLR3 plasma membrane translocation and is itself localized at the plasma membrane. The cytosolic TIR domain determines engagement of signaling adaptors and potentiation by UNC93B1. Endocytosis and endosomal acidification are important for robust TLR3 signaling.","method":"TLR3/TLR9 chimeric receptor constructs, confocal microscopy localization, UNC93B1 overexpression, endosomal acidification inhibition","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — domain-swap mutagenesis with localization and functional readouts, single lab","pmids":["24651829"],"is_preprint":false},{"year":2016,"finding":"TLR3 activation of mesenchymal stromal cells (MSCs) increases Treg induction in co-cultures via cell-contact-dependent Notch signaling; this involves upregulation of the Notch ligand Delta-like 1 in TLR3-activated MSCs. Notch inhibition abrogates the augmented Treg levels, and TLR3 gene silencing abolishes the effect.","method":"MSC-lymphocyte co-culture, TLR3/TLR4 gene silencing, Notch inhibitor, gene expression analysis","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gene silencing plus pharmacological pathway inhibition plus cell contact assay, single lab","pmids":["27571579"],"is_preprint":false},{"year":2016,"finding":"LUBAC components (SHARPIN, HOIL-1, HOIP) interact with the TLR3 signaling complex and are required for TLR3-mediated gene activation. Absence of LUBAC components increases formation of a TLR3-induced death-inducing signaling complex, leading to enhanced cell death. Excessive TLR3-mediated cell death driven by skin dsRNA is a major contributor to autoinflammatory skin phenotype in SHARPIN-deficient cpdm mice, as genetic TLR3 co-ablation substantially ameliorates cpdm dermatitis.","method":"Co-IP of LUBAC with TLR3 SC, LUBAC-deficient mice, Tlr3/cpdm double KO genetic epistasis, NF-κB/IRF3 activation assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP plus genetic epistasis (double KO rescue) plus in vivo phenotype, multiple orthogonal methods","pmids":["27810922"],"is_preprint":false},{"year":2016,"finding":"TLR3 signals through MYD88 to negatively regulate Disc1 expression in neurons, causing impaired dendritic arborization; cytokines are not involved. TLR3 activation at neonatal stage also increases dendritic spine density but narrows spine heads at P21, indicating lasting spinogenesis effects. The dendritic arborization impairment is rescued by MYD88 deficiency or DISC1 overexpression.","method":"Cultured neurons and in vivo mouse brain studies (in utero electroporation), MYD88-deficient cells, DISC1 overexpression rescue, cytokine neutralization","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO epistasis with rescue experiment, in vitro and in vivo neuronal models, single lab","pmids":["27979975"],"is_preprint":false},{"year":2018,"finding":"TLR8, TLR7, and TLR3 each promote dendritic pruning via MYD88 signaling in neurons but induce different transcriptomic profiles. TLR7 and TLR3 (but not TLR8) also control axonal growth. MAPK signaling is specifically implicated in TLR8-mediated dendritic pruning.","method":"In vitro neuronal cultures, in utero electroporation, transcriptomic profiling, pathway analyses, TLR-specific agonist treatment","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo neuronal morphology assays with transcriptomic validation, single lab, multiple TLR comparisons","pmids":["29777026"],"is_preprint":false},{"year":2018,"finding":"TLR3 inhibition blocks cardiomyocyte maturation; committed precursor cells fail to express maturation genes and sarcomeres do not develop. TLR3's effect on cardiomyocyte maturation is dependent on the RelA subunit of NF-κB, which becomes enriched at promoters of cardiomyocyte maturation genes under conditions promoting cardiomyocyte development.","method":"TLR3 inhibition, NF-κB RelA knockdown/analysis, chromatin immunoprecipitation for NF-κB at maturation gene promoters, cardiac differentiation assays","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TLR3 inhibition phenotype plus ChIP showing NF-κB at target promoters, two orthogonal methods, single lab","pmids":["29676038"],"is_preprint":false},{"year":2019,"finding":"Angiotensin II-induced hypertension requires the TLR3-TRIF pathway but not TLR4, while cardiac hypertrophy requires both TLR3-TRIF and TLR4-TRIF pathways, demonstrating nonredundant roles for these two TLRs downstream of TRIF.","method":"TLR3-/- and TLR4-/- mice, ANG II infusion model, blood pressure and cardiac hypertrophy measurements, proinflammatory gene expression in heart and kidney","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO epistasis with two distinct KO lines, multiple physiological readouts, single lab","pmids":["30793936"],"is_preprint":false},{"year":2020,"finding":"Double-stranded RNA (including endogenous retroviral element RNAs upregulated in metastatic tumor cells) activates TLR3 on endothelial cells to induce SLIT2 expression, which in turn signals via ROBO1 on cancer cells to promote intravasation and metastasis. Deletion of endothelial Slit2 suppresses metastasis.","method":"Mouse breast/lung cancer models, endothelial ribosome-tagging/RNA-seq, endothelial Slit2 conditional KO, dsRNA/TLR3 epistasis experiments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mouse models, endothelial-specific genetic KO, deep sequencing, epistatic placement of TLR3 upstream of SLIT2-ROBO1 axis","pmids":["32999457"],"is_preprint":false},{"year":2021,"finding":"Human TLR3 controls constitutive (basal) levels of IFNB mRNA and secreted IFN-β protein in fibroblasts and iPSC-derived cortical neurons, thereby maintaining baseline ISG expression. TLR3-deficient fibroblasts and cortical neurons are vulnerable to multiple virus families, not just HSV-1, due to loss of basal IFN-β immunity. Tlr3-/- mouse embryonic fibroblasts also have lower basal ISG levels.","method":"TLR3-deficient human fibroblasts and iPSC-derived cortical neurons, Tlr3-/- MEFs, IFN-β protein measurement (ELISA), ISG mRNA quantification, viral susceptibility assays, WT TLR3 rescue","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — human patient-derived cells, mouse KO confirmation, iPSC-derived neurons, multiple orthogonal readouts, WT rescue experiment","pmids":["33393505"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of full-length TLR3 complexed with ~400-bp poly(I:C) reveals that TLR3 homodimers cluster along the dsRNA helix in a highly organized, cooperative fashion with a uniform inter-dimer spacing of 103 Å. The intracellular and transmembrane domains are dispensable for cluster formation; ligand-induced clustering is proposed to drive ordered assembly of intracellular signaling adaptors for robust signaling.","method":"Cryo-electron microscopy structural determination of full-length TLR3 + long dsRNA complex; deletion mutant analysis confirming transmembrane/intracellular domains dispensable for clustering","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with domain deletion functional validation, single rigorous structural study with orthogonal biochemical confirmation","pmids":["36371424"],"is_preprint":false},{"year":2023,"finding":"Cryo-EM analyses show that TLR3 dimers laterally form a higher-order multimeric complex along longer dsRNA (beyond the minimum 40-50 bp for dimerization), providing the structural basis for cooperative binding and explaining the length-dependent activation of TLR3.","method":"Cryo-electron microscopy of TLR3 in complex with longer dsRNA","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure directly resolving higher-order complex, corroborated by independent structural study in same year","pmids":["36631495"],"is_preprint":false},{"year":2022,"finding":"ZBP1 promotes the timely delivery of RIPK1 to the TLR3/4 adaptor TRIF and M1-ubiquitination of RIPK1, sustaining inflammatory signaling downstream of TLR3. Zbp1-/- mice show reduced TLR3-mediated inflammatory responses and prolonged survival in septic shock.","method":"ZBP1 KO mice, RIPK1-TRIF interaction assays, ubiquitination assays, in vivo LPS-induced septic shock model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice in vivo phenotype plus biochemical RIPK1-TRIF interaction and ubiquitination readouts, single lab","pmids":["35666872"],"is_preprint":false},{"year":2022,"finding":"PKR and TLR3 trigger distinct signals that synergize to induce rapid apoptosis in response to intracellular long dsRNA. PKR induces translational arrest reducing cellular FLICE-inhibitory protein levels, which then enables TLR3/TRIF-dependent caspase-8 activation; both PKR and TLR3 are essential for virus-induced apoptosis and arrest of viral production.","method":"Cytoplasmic RNA injection, PKR KO and TLR3 KO cells, caspase-8 activation assays, translational arrest measurements, apoptosis quantification","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO cells with reconstitution-style injection experiment, multiple mechanistic readouts, single lab","pmids":["35970851"],"is_preprint":false},{"year":2014,"finding":"Extracellular RNA released during myocardial ischemia-reperfusion (I/R) activates TLR3-TRIF signaling to promote cardiomyocyte apoptosis and cardiac injury, independent of inflammatory cytokine production and neutrophil recruitment. RNase (but not DNase) treatment reduces serum RNA levels and confers cardiac protection. IFNAR1 deletion had no effect on infarct size, placing this TLR3-TRIF pathway's injurious effect upstream of autocrine type I IFN.","method":"TLR3-/-, TRIF-/-, IFNAR1-/- mouse I/R models, infarct size measurement, apoptosis quantification, RNase/DNase in vivo treatment, cardiomyocyte necrosis RNA stimulation assays","journal":"Journal of the American Heart Association","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO models, pharmacological RNase validation, both in vitro and in vivo readouts, epistatic placement with IFNAR1 KO","pmids":["24390148"],"is_preprint":false},{"year":2011,"finding":"PLIC-1 (ubiquilin 1) is a negative regulator of TLR3-TRIF signaling. PLIC-1 interacts with TRIF (confirmed by co-IP and GST pull-down), colocalizes with TRIF and autophagosome marker LC3, and reduces TRIF protein abundance in a Nocodazole-sensitive manner; shRNA knockdown of PLIC-1 enhances TLR3 activation.","method":"Yeast-two-hybrid, co-IP, GST pull-down, shRNA knockdown, confocal microscopy, luciferase reporter assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays (co-IP + GST pulldown) plus functional knockdown, single lab","pmids":["21695056"],"is_preprint":false},{"year":2014,"finding":"Scavenger receptor SREC-I directly interacts with TLR3 in the presence of poly(I:C) and co-localizes with TLR3 and internalized dsRNA in endosomes, promoting dsRNA-mediated TLR3 activation through NFκB, MAPK, and IRF3 pathways and enhancing cytokine (IL-8, IFN-β) production in macrophages.","method":"Co-IP of SREC-I with TLR3, confocal colocalization, cytokine ELISA, NFκB/IRF3 activation assays in THP1 cells and BMDMs","journal":"Immunobiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single co-IP method with colocalization, functional cytokine readout, two cell types, single lab","pmids":["25641411"],"is_preprint":false},{"year":2015,"finding":"TLR3 activation in keratinocytes drives IRF6-dependent IL-23p19 expression and formation of a novel IL-23p19/EBI3 heterodimer (confirmed by co-IP and proximity ligation assay). IRF6 silencing inhibits poly(I:C)-inducible IL-23p19 but enhances IFN-β expression. Co-expression of IL-23p19 and EBI3 increases secreted IL-23p19 levels.","method":"siRNA silencing of IRF6, reporter assays, co-immunoprecipitation, proximity ligation assay, cytokine secretion measurement in primary keratinocytes","journal":"Immunology and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus proximity ligation plus reporter assays plus functional silencing, single lab","pmids":["26303210"],"is_preprint":false},{"year":2013,"finding":"TLR3 activation by poly(I:C) induces upregulation of miR-29b, -29c, -148b, and -152, which target DNA methyltransferases, leading to demethylation and re-expression of the oncosuppressor RARβ; cancer cells then become sensitive to retinoic acid and undergo apoptosis both in vitro and in vivo.","method":"miRNA profiling, luciferase reporter assays, DNA methylation assays, in vitro and in vivo tumor models, RARβ expression rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo validation with multiple cancer cell lines, miRNA-target axis confirmed by reporter assay, single lab","pmids":["23716670"],"is_preprint":false},{"year":2006,"finding":"Microglia recognize dsRNA through TLR3 and mount an innate immune response; TLR3-/- microglia show diminished cytokine secretion and delayed MAPK activation in response to poly(I:C). In vivo intracerebroventricular poly(I:C) injection causes microgliosis in WT but not TLR3-/- mice.","method":"Primary cultured WT and TLR3-/- microglia, poly(I:C) stimulation, MAPK activation time-course, ICV injection in vivo model, cell surface marker immunofluorescence","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — TLR3 KO both in vitro and in vivo, multiple readouts (cytokines, MAPK, morphology), replicated in two experimental systems","pmids":["16517751"],"is_preprint":false},{"year":2009,"finding":"MDA5 and TLR3 activate NK cells indirectly through different accessory cell types: MDA5 acts primarily through stromal cells inducing IFN-α, while TLR3 acts predominantly through hematopoietic cells inducing IL-12. TLR3 has a minor independent role; MDA5 is the primary driver of poly(I:C)-mediated NK cell activation.","method":"MDA5-/-, TLR3-/-, MDA5-/-TLR3-/- mice, bone marrow chimeras, NK cell activation assays, cytokine measurement","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — triple genetic KO comparison plus bone marrow chimeras, multiple orthogonal readouts, clearly assigns TLR3 to hematopoietic cells with IL-12 production","pmids":["19995959"],"is_preprint":false},{"year":2017,"finding":"RKIP preferentially regulates TLR3-mediated (but not TLR4 or TLR9-mediated) immune responses by interacting with TBK1 and promoting TBK1/IRF3 activation, and by enhancing interaction between TAK1 and MKK3, promoting p38 activation. Poly(I:C) but not LPS induces RKIP phosphorylation at S109, required for these TBK1- and MKK3-activating functions.","method":"RKIP KO mice, co-IP, phosphorylation site mutagenesis (S109), IRF3/p38 activation assays, cytokine production assays, TLR specificity comparison","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice plus co-IP plus phospho-site mutagenesis, single lab","pmids":["28411188"],"is_preprint":false},{"year":2021,"finding":"RNase T2 in endosomes/lysosomes negatively regulates TLR3 responses in macrophages: RNase T2 degrades dsRNA, and RNase T2-deficient macrophages show upregulated TLR3 responses. Enzymatic mutants demonstrate a positive correlation between RNA degradation activity and rescue of altered TLR responses, indicating degradation is mechanistically responsible.","method":"RNase T2-deficient macrophages, enzymatic mutant analysis, RNA degradation assays, TLR3/TLR7 response assays, colocalization of RNase T2 with poly(I:C)","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO cells plus enzymatic mutant structure-function analysis, single lab","pmids":["34161582"],"is_preprint":false}],"current_model":"TLR3 is an endosomal (and cell-surface) dsRNA receptor that, upon ligand binding, forms homodimers and higher-order cooperative multimers along long dsRNA (spacing ~103 Å); the N-terminal ectodomain fragment (cleaved by cathepsins but remaining associated with the C-terminal fragment) and FYVE-domain proteins (ZFYVE1, WDFY1) facilitate ligand binding and TRIF recruitment, after which the TLR3-TRIF signaling complex recruits LUBAC (for gene activation) or RIPK1/ZBP1 (for inflammatory and death signaling); TLR3 also signals via tyrosine phosphorylation-dependent PI3K/Akt and TBK1 branches to fully activate IRF3 and induce type I IFNs, and controls basal constitutive IFN-β that establishes a standing antiviral state in fibroblasts and CNS neurons; in a TRIF/MyD88-independent branch, activated TLR3 engages c-Src to bi-phasically regulate cell migration, adhesion, and proliferation, and activates NF-κB RelA to drive cardiomyocyte maturation; endogenous ligands including UVB-damaged self-RNA, extracellular RNA released from necrotic/ischemic cells, and endogenous retroviral RNAs from metastatic tumor cells all activate TLR3 to drive inflammation, angiogenesis suppression, or pro-metastatic SLIT2 induction in endothelium."},"narrative":{"mechanistic_narrative":"TLR3 is a double-stranded RNA receptor that initiates innate antiviral and inflammatory programs, recognizing viral dsRNA as well as self-derived ligands and driving an IRF3-dependent type I IFN response that selectively restricts viral replication [PMID:12354379, PMID:16517751]. Ligand engagement triggers cooperative receptor assembly: cryo-EM shows TLR3 homodimers cluster along long dsRNA helices with uniform ~103 Å spacing, with longer duplexes nucleating higher-order multimers, providing the structural basis for length-dependent activation; the transmembrane and intracellular domains are dispensable for this clustering [PMID:36371424, PMID:36631495]. Productive signaling requires proteolytic and trafficking maturation — the cathepsin-cleaved N-terminal ectodomain fragment remains associated with the C-terminal fragment, and both are needed for IFN-β and NF-κB activation [PMID:25305318] — together with accessory factors that promote ligand binding and TRIF recruitment, including the FYVE-domain proteins ZFYVE1 and WDFY1, ZCCHC3, and the endosomal maturation factor S100A9 [PMID:25736436, PMID:32133501, PMID:31388100, PMID:26385519]. Downstream, TLR3 phosphorylation on specific tyrosines bifurcates signaling into a TBK1/IRF3 branch and a PI3K/Akt branch required for full IRF3 phosphorylation and target-gene promoter binding [PMID:15502848], and the TLR3-TRIF complex engages LUBAC for gene activation versus RIPK1/ZBP1 for inflammatory and death signaling [PMID:27810922, PMID:35666872]. Beyond canonical antiviral defense, TLR3 controls a basal constitutive IFN-β tone that establishes a standing antiviral state in human fibroblasts and cortical neurons [PMID:33393505], and acts on diverse self-ligands — UVB-damaged self-RNA, extracellular RNA released during ischemia, and tumor-derived endogenous retroviral RNA — to drive immune suppression, cardiac injury, angiogenesis suppression, or pro-metastatic SLIT2 induction in endothelium [PMID:22772463, PMID:24390148, PMID:18368052, PMID:32999457]. A TRIF/MyD88-independent branch through c-Src biphasically regulates cell migration, adhesion, and proliferation [PMID:22323545], and MyD88-dependent TLR3 signaling shapes neuronal dendritic arborization and pruning [PMID:27979975, PMID:29777026].","teleology":[{"year":2002,"claim":"Established that TLR3 signaling converges on IRF3 to drive a specific antiviral transcriptional program, defining the receptor's core output as type I IFN induction rather than generic inflammation.","evidence":"Genetic loss-of-function, expression profiling, and viral replication assays in macrophages/fibroblasts","pmids":["12354379"],"confidence":"High","gaps":["Did not resolve receptor-proximal events linking dsRNA binding to IRF3","Did not distinguish viral from endogenous ligand recognition"]},{"year":2004,"claim":"Resolved how TLR3 bifurcates signaling, showing tyrosine phosphorylation drives separable TBK1/IRF3 and PI3K/Akt branches, the latter required for full IRF3 activation and promoter binding.","evidence":"Tyrosine phosphosite mutagenesis, PI3K inhibition, and promoter-binding assays","pmids":["15502848"],"confidence":"High","gaps":["Identity of the kinase phosphorylating TLR3 tyrosines not established","How PI3K recruitment is spatially organized at the receptor unclear"]},{"year":2006,"claim":"Demonstrated CNS-intrinsic TLR3 function by showing microglia mount poly(I:C) responses via TLR3, extending its role beyond classical immune cells.","evidence":"WT and TLR3-/- primary microglia and intracerebroventricular poly(I:C) injection","pmids":["16517751"],"confidence":"High","gaps":["Endogenous CNS ligand not defined","Downstream effector program in microglia not fully mapped"]},{"year":2008,"claim":"Revealed a cell-surface, sequence-independent TLR3 activity by which long extracellular siRNAs suppress neovascularization, with a length threshold matching a modeled 2:1 receptor stoichiometry.","evidence":"Mouse CNV models, siRNA length series, TLR3/TRIF KO mice, and pharmacogenetic 412FF variant analysis","pmids":["18368052"],"confidence":"High","gaps":["Mechanism coupling cell-surface TLR3 to anti-angiogenic effectors incomplete","Generality of surface vs endosomal signaling not resolved"]},{"year":2009,"claim":"Confirmed direct cell-surface TLR3 activation on endothelium, showing 21-nt but not 7-nt siRNA phosphorylates surface TLR3 and triggers apoptosis to suppress hem- and lymphangiogenesis.","evidence":"Mouse neovascularization models with surface TLR3 phosphorylation and internalization controls","pmids":["19359485"],"confidence":"High","gaps":["Adaptor usage at the cell surface vs endosome not delineated","Apoptotic effector pathway not defined"]},{"year":2012,"claim":"Identified TLR3 as a sensor of UVB-damaged self-RNA acting as a DAMP, broadening its ligand repertoire to endogenous noncoding RNA driving sterile inflammation and UV immunosuppression.","evidence":"TLR3/TRIF KO mice, purified UVB-irradiated noncoding RNA stimulation, in vivo UVB model","pmids":["22772463"],"confidence":"High","gaps":["Structural features of UVB-modified RNA recognized by TLR3 unclear","Whether other damaged self-RNAs share this activity unaddressed"]},{"year":2012,"claim":"Uncovered a TRIF/MyD88-independent branch in which dsRNA-bound TLR3 recruits c-Src to biphasically control migration, adhesion, and proliferation, decoupling some TLR3 outputs from canonical adaptors.","evidence":"Co-IP of Src with TLR3, lipid raft fractionation, TRIF/MyD88-deficient cells, migration/adhesion assays","pmids":["22323545"],"confidence":"High","gaps":["Direct vs indirect TLR3-Src association not fully resolved","Physiological context of this branch in vivo unaddressed"]},{"year":2014,"claim":"Defined the post-translational and trafficking requirements for TLR3 activation: the ectodomain dictates plasma-membrane localization (UNC93B1-dependent), the TIR domain selects adaptors, and cathepsin cleavage yields associated N/C fragments both needed for signaling.","evidence":"Chimeric receptor and domain-deletion constructs, cleavage-site mapping, UNC93B1 manipulation, confocal localization","pmids":["24651829","25305318"],"confidence":"Medium","gaps":["Functional consequence of cleavage for ligand binding vs signaling not separated","Surface vs endosomal pool contributions to signaling unresolved"]},{"year":2014,"claim":"Established TLR3-TRIF as a driver of cardiac ischemia-reperfusion injury via extracellular RNA, acting upstream of and independent of autocrine type I IFN.","evidence":"TLR3-/-, TRIF-/-, IFNAR1-/- I/R mouse models with RNase/DNase treatment and apoptosis readouts","pmids":["24390148"],"confidence":"High","gaps":["Cell-death effector pathway downstream of TRIF in cardiomyocytes not detailed","Source and identity of injurious extracellular RNA not fully defined"]},{"year":2014,"claim":"Identified FYVE-domain adaptor WDFY1 as a positive regulator bridging TRIF recruitment to TLR3 (and TLR4), implicating endosomal phosphoinositide-binding proteins in signal assembly.","evidence":"Reciprocal co-IP with gain/loss-of-function reporter and cytokine assays","pmids":["25736436"],"confidence":"Medium","gaps":["Whether WDFY1 acts at the receptor or adaptor level not fully resolved","Single-lab finding without in vivo validation"]},{"year":2015,"claim":"Showed S100A9 is required for maturation of TLR3-containing endosomes into late endosomes where TLR3 meets its dsRNA ligand, placing endosomal trafficking control upstream of signaling.","evidence":"S100A9-KO macrophages with colocalization microscopy, co-IP, endosomal fractionation, in vivo poly(I:C) challenge","pmids":["26385519"],"confidence":"High","gaps":["Molecular basis of S100A9-TLR3 interaction not defined","Whether S100A9 acts generally for endosomal TLRs unaddressed"]},{"year":2015,"claim":"Identified additional accessory factors (ZCCHC3, scavenger receptor SREC-I) that facilitate TRIF recruitment and dsRNA-mediated TLR3 activation, refining the assembly machinery of the signaling complex.","evidence":"Co-IP, KO cells/mice, colocalization, and cytokine/reporter assays","pmids":["32133501","25641411"],"confidence":"Medium","gaps":["Hierarchy and redundancy among accessory factors not established","Direct vs scaffolded interactions not fully resolved"]},{"year":2016,"claim":"Resolved a key signaling decision point by showing LUBAC engagement of the TLR3 complex routes signaling toward gene activation and restrains assembly of a death-inducing complex, with loss of LUBAC driving TLR3-dependent autoinflammatory pathology.","evidence":"Co-IP of LUBAC with TLR3 complex, LUBAC-deficient mice, and Tlr3/cpdm double-KO genetic epistasis","pmids":["27810922"],"confidence":"High","gaps":["Molecular switch toggling gene-activation vs death complexes not fully defined","Ubiquitin linkage architecture on the TLR3 complex not resolved"]},{"year":2016,"claim":"Demonstrated non-immune developmental roles for TLR3, including MyD88-dependent control of neuronal dendritic arborization via DISC1 and RelA-dependent control of cardiomyocyte maturation gene expression.","evidence":"MyD88-KO epistasis and DISC1 rescue in neurons; TLR3 inhibition with RelA ChIP at maturation gene promoters","pmids":["27979975","29676038"],"confidence":"Medium","gaps":["Ligand driving these developmental TLR3 functions unidentified","How a dsRNA receptor couples to developmental transcription unclear"]},{"year":2019,"claim":"Identified ZFYVE1 as a FYVE-domain factor that binds the TLR3 ectodomain and enhances ligand-binding affinity, providing a mechanism for positively tuning TLR3 antiviral signaling.","evidence":"Co-IP with domain mapping, ligand-binding affinity assays, and Zfyve1-/- mice","pmids":["31388100"],"confidence":"Medium","gaps":["Structural mode of ZFYVE1-TLR3 binding not resolved","Relationship to WDFY1 function not clarified"]},{"year":2020,"claim":"Placed TLR3 in a pro-metastatic circuit, showing endogenous retroviral dsRNA activates endothelial TLR3 to induce SLIT2, which signals via ROBO1 on cancer cells to promote intravasation.","evidence":"Mouse tumor models, endothelial ribosome-tagging RNA-seq, endothelial Slit2 conditional KO, and dsRNA/TLR3 epistasis","pmids":["32999457"],"confidence":"High","gaps":["Adaptor branch coupling endothelial TLR3 to SLIT2 transcription not defined","Therapeutic tractability of the axis unaddressed"]},{"year":2021,"claim":"Revealed a homeostatic function in which human TLR3 sustains constitutive basal IFN-β and baseline ISG expression, establishing a standing antiviral state in fibroblasts and cortical neurons against multiple virus families.","evidence":"TLR3-deficient human fibroblasts and iPSC-derived neurons, Tlr3-/- MEFs, IFN-β ELISA, ISG quantification, WT rescue","pmids":["33393505"],"confidence":"High","gaps":["Endogenous ligand maintaining basal IFN-β not identified","How basal vs induced TLR3 signaling are distinguished mechanistically unclear"]},{"year":2022,"claim":"Provided the structural logic of TLR3 activation, showing cooperative homodimer clustering at 103 Å spacing along long dsRNA, with the TM/intracellular domains dispensable for clustering, explaining length-dependent signaling.","evidence":"Cryo-EM of full-length TLR3 with ~400-bp poly(I:C) plus domain-deletion validation","pmids":["36371424","36631495"],"confidence":"High","gaps":["How ectodomain clustering templates intracellular adaptor assembly not directly visualized","Stoichiometry of TRIF recruitment per cluster unknown"]},{"year":2022,"claim":"Clarified how the TLR3 complex sustains inflammatory output, with ZBP1 delivering RIPK1 to TRIF and promoting RIPK1 M1-ubiquitination, and PKR cooperating with TLR3/TRIF to license caspase-8-dependent apoptosis.","evidence":"ZBP1-KO and PKR/TLR3-KO systems with RIPK1-TRIF interaction, ubiquitination, caspase-8, and in vivo readouts","pmids":["35666872","35970851"],"confidence":"Medium","gaps":["Switch 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Expression.","date":"2020","source":"Viruses","url":"https://pubmed.ncbi.nlm.nih.gov/31947624","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50503,"output_tokens":9000,"usd":0.143255,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18725,"output_tokens":6209,"usd":0.124425,"stage2_stop_reason":"end_turn"},"total_usd":0.26768,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"TLR3 and TLR4, but not TLR2 or TLR9, activate IRF3, which mediates a specific antiviral gene program including IFN-β induction; IRF3 confers TLR3/TLR4 specificity and selectively inhibits viral replication.\",\n      \"method\": \"Genetic loss-of-function, gene expression profiling, pathway epistasis in macrophages/fibroblasts\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (gene KO, expression arrays, functional viral replication assay), replicated across TLR3 and TLR4 contexts in same study\",\n      \"pmids\": [\"12354379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"dsRNA-activated phosphorylation of two specific tyrosine residues of TLR3 is essential for initiating two distinct signaling pathways: one activating TBK-1 (leading to IRF-3 Ser/Thr phosphorylation) and one recruiting and activating PI3 kinase/Akt (required for full IRF-3 phosphorylation and target gene promoter binding). Without PI3K recruitment to TLR3, IRF-3 is only partially phosphorylated and fails to bind target gene promoters.\",\n      \"method\": \"Tyrosine phosphorylation site mutagenesis, PI3K inhibition, in vitro signaling assays, promoter binding assays\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis plus in vitro kinase/signaling assays with multiple orthogonal readouts in a single focused study\",\n      \"pmids\": [\"15502848\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TLR3 mediates sequence- and target-independent suppression of choroidal neovascularization by extracellular siRNAs (≥21 nt) acting on the cell surface. This requires TLR3 and its adaptor TRIF, and induces IFN-γ and IL-12. A minimum siRNA length of 21 nucleotides is required, consistent with a modeled 2:1 TLR3-RNA complex. The TLR3 coding variant 412FF renders endothelial cells refractory to extracellular siRNA-induced cytotoxicity.\",\n      \"method\": \"Mouse CNV models, siRNA length-series experiments, TLR3-deficient mice, TRIF-deficient mice, cell-surface TLR3 detection, pharmacogenetic variant analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic knockouts, pharmacogenetic variant, multiple in vivo models, consistent mechanism across orthogonal methods\",\n      \"pmids\": [\"18368052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"21-nt siRNA activates cell-surface TLR3 on lymphatic endothelial cells (phosphorylation of surface TLR3 demonstrated), induces apoptosis, and suppresses both hemangiogenesis and lymphangiogenesis in mouse models. A 7-nt siRNA too short to activate TLR3 has no such effect. siRNA is not internalized unless cell-permeating moieties are used.\",\n      \"method\": \"Mouse corneal suture and hindlimb ischemia neovascularization models, TLR3 phosphorylation assays, siRNA internalization controls, apoptosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple in vivo models, direct TLR3 phosphorylation readout, length-control experiments, consistent with companion Nature paper\",\n      \"pmids\": [\"19359485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"UVB-damaged self noncoding RNA (e.g., UVB-irradiated U1 RNA) is recognized by TLR3 (and adaptor TRIF) to induce TNF-α and IL-6 from keratinocytes and PBMCs. Tlr3-/- mice fail to upregulate TNF-α in skin after UVB exposure and lack UVB-induced immune suppression, establishing TLR3 as a sensor of UV-damaged self-RNA acting as a DAMP.\",\n      \"method\": \"TLR3 KO mice, purified noncoding RNA stimulation, whole-transcriptome sequencing, TRIF-deficient cells, in vivo UVB model\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — TLR3 KO and TRIF KO genetic validation, purified RNA reconstitution, multiple orthogonal in vitro and in vivo readouts\",\n      \"pmids\": [\"22772463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A TRIF-independent branch of TLR3 signaling, mediated by the proto-oncoprotein c-Src (which binds TLR3 after dsRNA stimulation), controls cell migration, adhesion, and proliferation in a biphasic manner: immediate increase in motility via Src phosphorylation/activation, followed by strong inhibition via Src sequestration in lipid rafts. MyD88 is also not required for this pathway.\",\n      \"method\": \"dsRNA stimulation, Src binding to TLR3 (co-IP), lipid raft fractionation, TLR3/TRIF/MyD88-deficient cells, cell migration and adhesion assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct TLR3-Src interaction (co-IP), genetic pathway dissection with TRIF/MyD88 KO, multiple cellular readouts in single focused study\",\n      \"pmids\": [\"22323545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The N-terminal TLR3 ectodomain fragment (TLR3N, cleaved by cathepsins in endolysosomes starting at 343S) remains associated with the C-terminal fragment (TLR3C); both are required for dsRNA-induced activation of IFN-β and NF-κB promoters. Cell-surface TLR3 is highly expressed on splenic CD8+ DCs and marginal zone B cells in a UNC93B1-dependent manner.\",\n      \"method\": \"Cleavage site mapping, promoter activation assays with TLR3N/C domain deletion mutants, new monoclonal antibodies to mouse TLR3, flow cytometry, UNC93B1-deficient cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis/domain deletion with functional readout, cleavage site biochemistry, genetic (UNC93B1 KO) validation, single focused study with multiple methods\",\n      \"pmids\": [\"25305318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"WDFY1 (WD repeat and FYVE domain-containing protein) is a crucial adaptor that interacts with TLR3 and TLR4 and mediates the recruitment of TRIF to these receptors. WDFY1 overexpression potentiates TLR3/4-mediated NF-κB, IRF3 activation and type I IFN production; WDFY1 depletion has the opposite effect.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown, NF-κB/IRF3 reporter assays, cytokine ELISA\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and functional gain/loss-of-function, single lab, two orthogonal methods\",\n      \"pmids\": [\"25736436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZCCHC3 promotes TLR3-mediated signaling by facilitating the recruitment of TRIF to TLR3 after poly(I:C) stimulation. ZCCHC3 deficiency specifically inhibits TLR3- but not TLR4-mediated type I IFN and proinflammatory cytokine induction; Zcchc3-/- mice are more resistant to poly(I:C)-induced inflammatory death.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/KO cells, Zcchc3-/- mice, cytokine assays\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus KO mouse phenotype plus reporter assay, single lab\",\n      \"pmids\": [\"32133501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZFYVE1 (zinc-finger FYVE domain-containing protein, a guanylate-binding protein) interacts with TLR3 via its FYVE domain (binding the TLR3 ectodomain) and enhances TLR3 ligand (poly(I:C)) binding affinity, positively regulating TLR3-mediated antiviral signaling. Zfyve1-/- mice are less susceptible to poly(I:C)-induced inflammatory death.\",\n      \"method\": \"Co-IP, domain mapping, ligand-binding affinity assay, KO mice, gene expression assays\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mapping plus in vivo KO phenotype, single lab\",\n      \"pmids\": [\"31388100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"S100A9 is required for maturation of TLR3-containing early endosomes (EE) into late endosomes (LE), enabling TLR3 to colocalize with and sense dsRNA ligands. S100A9 interacts with TLR3 following poly(I:C) treatment; in S100A9-KO macrophages, TLR3 cannot be detected in LE and fails to colocalize with poly(I:C), resulting in dramatically reduced cytokine production.\",\n      \"method\": \"S100A9 KO macrophages, co-localization microscopy, co-immunoprecipitation, endosomal fractionation, in vivo poly(I:C) challenge\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO cells and mice, co-IP interaction, colocalization by microscopy, multiple orthogonal readouts demonstrating trafficking mechanism\",\n      \"pmids\": [\"26385519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The ectodomain of TLR3 (not its transmembrane segment or cytosolic domain) is required for plasma membrane localization. UNC93B1 promotes TLR3 plasma membrane translocation and is itself localized at the plasma membrane. The cytosolic TIR domain determines engagement of signaling adaptors and potentiation by UNC93B1. Endocytosis and endosomal acidification are important for robust TLR3 signaling.\",\n      \"method\": \"TLR3/TLR9 chimeric receptor constructs, confocal microscopy localization, UNC93B1 overexpression, endosomal acidification inhibition\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain-swap mutagenesis with localization and functional readouts, single lab\",\n      \"pmids\": [\"24651829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TLR3 activation of mesenchymal stromal cells (MSCs) increases Treg induction in co-cultures via cell-contact-dependent Notch signaling; this involves upregulation of the Notch ligand Delta-like 1 in TLR3-activated MSCs. Notch inhibition abrogates the augmented Treg levels, and TLR3 gene silencing abolishes the effect.\",\n      \"method\": \"MSC-lymphocyte co-culture, TLR3/TLR4 gene silencing, Notch inhibitor, gene expression analysis\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gene silencing plus pharmacological pathway inhibition plus cell contact assay, single lab\",\n      \"pmids\": [\"27571579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LUBAC components (SHARPIN, HOIL-1, HOIP) interact with the TLR3 signaling complex and are required for TLR3-mediated gene activation. Absence of LUBAC components increases formation of a TLR3-induced death-inducing signaling complex, leading to enhanced cell death. Excessive TLR3-mediated cell death driven by skin dsRNA is a major contributor to autoinflammatory skin phenotype in SHARPIN-deficient cpdm mice, as genetic TLR3 co-ablation substantially ameliorates cpdm dermatitis.\",\n      \"method\": \"Co-IP of LUBAC with TLR3 SC, LUBAC-deficient mice, Tlr3/cpdm double KO genetic epistasis, NF-κB/IRF3 activation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP plus genetic epistasis (double KO rescue) plus in vivo phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"27810922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TLR3 signals through MYD88 to negatively regulate Disc1 expression in neurons, causing impaired dendritic arborization; cytokines are not involved. TLR3 activation at neonatal stage also increases dendritic spine density but narrows spine heads at P21, indicating lasting spinogenesis effects. The dendritic arborization impairment is rescued by MYD88 deficiency or DISC1 overexpression.\",\n      \"method\": \"Cultured neurons and in vivo mouse brain studies (in utero electroporation), MYD88-deficient cells, DISC1 overexpression rescue, cytokine neutralization\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO epistasis with rescue experiment, in vitro and in vivo neuronal models, single lab\",\n      \"pmids\": [\"27979975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TLR8, TLR7, and TLR3 each promote dendritic pruning via MYD88 signaling in neurons but induce different transcriptomic profiles. TLR7 and TLR3 (but not TLR8) also control axonal growth. MAPK signaling is specifically implicated in TLR8-mediated dendritic pruning.\",\n      \"method\": \"In vitro neuronal cultures, in utero electroporation, transcriptomic profiling, pathway analyses, TLR-specific agonist treatment\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo neuronal morphology assays with transcriptomic validation, single lab, multiple TLR comparisons\",\n      \"pmids\": [\"29777026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TLR3 inhibition blocks cardiomyocyte maturation; committed precursor cells fail to express maturation genes and sarcomeres do not develop. TLR3's effect on cardiomyocyte maturation is dependent on the RelA subunit of NF-κB, which becomes enriched at promoters of cardiomyocyte maturation genes under conditions promoting cardiomyocyte development.\",\n      \"method\": \"TLR3 inhibition, NF-κB RelA knockdown/analysis, chromatin immunoprecipitation for NF-κB at maturation gene promoters, cardiac differentiation assays\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TLR3 inhibition phenotype plus ChIP showing NF-κB at target promoters, two orthogonal methods, single lab\",\n      \"pmids\": [\"29676038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Angiotensin II-induced hypertension requires the TLR3-TRIF pathway but not TLR4, while cardiac hypertrophy requires both TLR3-TRIF and TLR4-TRIF pathways, demonstrating nonredundant roles for these two TLRs downstream of TRIF.\",\n      \"method\": \"TLR3-/- and TLR4-/- mice, ANG II infusion model, blood pressure and cardiac hypertrophy measurements, proinflammatory gene expression in heart and kidney\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO epistasis with two distinct KO lines, multiple physiological readouts, single lab\",\n      \"pmids\": [\"30793936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Double-stranded RNA (including endogenous retroviral element RNAs upregulated in metastatic tumor cells) activates TLR3 on endothelial cells to induce SLIT2 expression, which in turn signals via ROBO1 on cancer cells to promote intravasation and metastasis. Deletion of endothelial Slit2 suppresses metastasis.\",\n      \"method\": \"Mouse breast/lung cancer models, endothelial ribosome-tagging/RNA-seq, endothelial Slit2 conditional KO, dsRNA/TLR3 epistasis experiments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mouse models, endothelial-specific genetic KO, deep sequencing, epistatic placement of TLR3 upstream of SLIT2-ROBO1 axis\",\n      \"pmids\": [\"32999457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Human TLR3 controls constitutive (basal) levels of IFNB mRNA and secreted IFN-β protein in fibroblasts and iPSC-derived cortical neurons, thereby maintaining baseline ISG expression. TLR3-deficient fibroblasts and cortical neurons are vulnerable to multiple virus families, not just HSV-1, due to loss of basal IFN-β immunity. Tlr3-/- mouse embryonic fibroblasts also have lower basal ISG levels.\",\n      \"method\": \"TLR3-deficient human fibroblasts and iPSC-derived cortical neurons, Tlr3-/- MEFs, IFN-β protein measurement (ELISA), ISG mRNA quantification, viral susceptibility assays, WT TLR3 rescue\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human patient-derived cells, mouse KO confirmation, iPSC-derived neurons, multiple orthogonal readouts, WT rescue experiment\",\n      \"pmids\": [\"33393505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of full-length TLR3 complexed with ~400-bp poly(I:C) reveals that TLR3 homodimers cluster along the dsRNA helix in a highly organized, cooperative fashion with a uniform inter-dimer spacing of 103 Å. The intracellular and transmembrane domains are dispensable for cluster formation; ligand-induced clustering is proposed to drive ordered assembly of intracellular signaling adaptors for robust signaling.\",\n      \"method\": \"Cryo-electron microscopy structural determination of full-length TLR3 + long dsRNA complex; deletion mutant analysis confirming transmembrane/intracellular domains dispensable for clustering\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with domain deletion functional validation, single rigorous structural study with orthogonal biochemical confirmation\",\n      \"pmids\": [\"36371424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM analyses show that TLR3 dimers laterally form a higher-order multimeric complex along longer dsRNA (beyond the minimum 40-50 bp for dimerization), providing the structural basis for cooperative binding and explaining the length-dependent activation of TLR3.\",\n      \"method\": \"Cryo-electron microscopy of TLR3 in complex with longer dsRNA\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure directly resolving higher-order complex, corroborated by independent structural study in same year\",\n      \"pmids\": [\"36631495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ZBP1 promotes the timely delivery of RIPK1 to the TLR3/4 adaptor TRIF and M1-ubiquitination of RIPK1, sustaining inflammatory signaling downstream of TLR3. Zbp1-/- mice show reduced TLR3-mediated inflammatory responses and prolonged survival in septic shock.\",\n      \"method\": \"ZBP1 KO mice, RIPK1-TRIF interaction assays, ubiquitination assays, in vivo LPS-induced septic shock model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice in vivo phenotype plus biochemical RIPK1-TRIF interaction and ubiquitination readouts, single lab\",\n      \"pmids\": [\"35666872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PKR and TLR3 trigger distinct signals that synergize to induce rapid apoptosis in response to intracellular long dsRNA. PKR induces translational arrest reducing cellular FLICE-inhibitory protein levels, which then enables TLR3/TRIF-dependent caspase-8 activation; both PKR and TLR3 are essential for virus-induced apoptosis and arrest of viral production.\",\n      \"method\": \"Cytoplasmic RNA injection, PKR KO and TLR3 KO cells, caspase-8 activation assays, translational arrest measurements, apoptosis quantification\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO cells with reconstitution-style injection experiment, multiple mechanistic readouts, single lab\",\n      \"pmids\": [\"35970851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Extracellular RNA released during myocardial ischemia-reperfusion (I/R) activates TLR3-TRIF signaling to promote cardiomyocyte apoptosis and cardiac injury, independent of inflammatory cytokine production and neutrophil recruitment. RNase (but not DNase) treatment reduces serum RNA levels and confers cardiac protection. IFNAR1 deletion had no effect on infarct size, placing this TLR3-TRIF pathway's injurious effect upstream of autocrine type I IFN.\",\n      \"method\": \"TLR3-/-, TRIF-/-, IFNAR1-/- mouse I/R models, infarct size measurement, apoptosis quantification, RNase/DNase in vivo treatment, cardiomyocyte necrosis RNA stimulation assays\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO models, pharmacological RNase validation, both in vitro and in vivo readouts, epistatic placement with IFNAR1 KO\",\n      \"pmids\": [\"24390148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PLIC-1 (ubiquilin 1) is a negative regulator of TLR3-TRIF signaling. PLIC-1 interacts with TRIF (confirmed by co-IP and GST pull-down), colocalizes with TRIF and autophagosome marker LC3, and reduces TRIF protein abundance in a Nocodazole-sensitive manner; shRNA knockdown of PLIC-1 enhances TLR3 activation.\",\n      \"method\": \"Yeast-two-hybrid, co-IP, GST pull-down, shRNA knockdown, confocal microscopy, luciferase reporter assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays (co-IP + GST pulldown) plus functional knockdown, single lab\",\n      \"pmids\": [\"21695056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Scavenger receptor SREC-I directly interacts with TLR3 in the presence of poly(I:C) and co-localizes with TLR3 and internalized dsRNA in endosomes, promoting dsRNA-mediated TLR3 activation through NFκB, MAPK, and IRF3 pathways and enhancing cytokine (IL-8, IFN-β) production in macrophages.\",\n      \"method\": \"Co-IP of SREC-I with TLR3, confocal colocalization, cytokine ELISA, NFκB/IRF3 activation assays in THP1 cells and BMDMs\",\n      \"journal\": \"Immunobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single co-IP method with colocalization, functional cytokine readout, two cell types, single lab\",\n      \"pmids\": [\"25641411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TLR3 activation in keratinocytes drives IRF6-dependent IL-23p19 expression and formation of a novel IL-23p19/EBI3 heterodimer (confirmed by co-IP and proximity ligation assay). IRF6 silencing inhibits poly(I:C)-inducible IL-23p19 but enhances IFN-β expression. Co-expression of IL-23p19 and EBI3 increases secreted IL-23p19 levels.\",\n      \"method\": \"siRNA silencing of IRF6, reporter assays, co-immunoprecipitation, proximity ligation assay, cytokine secretion measurement in primary keratinocytes\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus proximity ligation plus reporter assays plus functional silencing, single lab\",\n      \"pmids\": [\"26303210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TLR3 activation by poly(I:C) induces upregulation of miR-29b, -29c, -148b, and -152, which target DNA methyltransferases, leading to demethylation and re-expression of the oncosuppressor RARβ; cancer cells then become sensitive to retinoic acid and undergo apoptosis both in vitro and in vivo.\",\n      \"method\": \"miRNA profiling, luciferase reporter assays, DNA methylation assays, in vitro and in vivo tumor models, RARβ expression rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo validation with multiple cancer cell lines, miRNA-target axis confirmed by reporter assay, single lab\",\n      \"pmids\": [\"23716670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Microglia recognize dsRNA through TLR3 and mount an innate immune response; TLR3-/- microglia show diminished cytokine secretion and delayed MAPK activation in response to poly(I:C). In vivo intracerebroventricular poly(I:C) injection causes microgliosis in WT but not TLR3-/- mice.\",\n      \"method\": \"Primary cultured WT and TLR3-/- microglia, poly(I:C) stimulation, MAPK activation time-course, ICV injection in vivo model, cell surface marker immunofluorescence\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — TLR3 KO both in vitro and in vivo, multiple readouts (cytokines, MAPK, morphology), replicated in two experimental systems\",\n      \"pmids\": [\"16517751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MDA5 and TLR3 activate NK cells indirectly through different accessory cell types: MDA5 acts primarily through stromal cells inducing IFN-α, while TLR3 acts predominantly through hematopoietic cells inducing IL-12. TLR3 has a minor independent role; MDA5 is the primary driver of poly(I:C)-mediated NK cell activation.\",\n      \"method\": \"MDA5-/-, TLR3-/-, MDA5-/-TLR3-/- mice, bone marrow chimeras, NK cell activation assays, cytokine measurement\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — triple genetic KO comparison plus bone marrow chimeras, multiple orthogonal readouts, clearly assigns TLR3 to hematopoietic cells with IL-12 production\",\n      \"pmids\": [\"19995959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RKIP preferentially regulates TLR3-mediated (but not TLR4 or TLR9-mediated) immune responses by interacting with TBK1 and promoting TBK1/IRF3 activation, and by enhancing interaction between TAK1 and MKK3, promoting p38 activation. Poly(I:C) but not LPS induces RKIP phosphorylation at S109, required for these TBK1- and MKK3-activating functions.\",\n      \"method\": \"RKIP KO mice, co-IP, phosphorylation site mutagenesis (S109), IRF3/p38 activation assays, cytokine production assays, TLR specificity comparison\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice plus co-IP plus phospho-site mutagenesis, single lab\",\n      \"pmids\": [\"28411188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNase T2 in endosomes/lysosomes negatively regulates TLR3 responses in macrophages: RNase T2 degrades dsRNA, and RNase T2-deficient macrophages show upregulated TLR3 responses. Enzymatic mutants demonstrate a positive correlation between RNA degradation activity and rescue of altered TLR responses, indicating degradation is mechanistically responsible.\",\n      \"method\": \"RNase T2-deficient macrophages, enzymatic mutant analysis, RNA degradation assays, TLR3/TLR7 response assays, colocalization of RNase T2 with poly(I:C)\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO cells plus enzymatic mutant structure-function analysis, single lab\",\n      \"pmids\": [\"34161582\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TLR3 is an endosomal (and cell-surface) dsRNA receptor that, upon ligand binding, forms homodimers and higher-order cooperative multimers along long dsRNA (spacing ~103 Å); the N-terminal ectodomain fragment (cleaved by cathepsins but remaining associated with the C-terminal fragment) and FYVE-domain proteins (ZFYVE1, WDFY1) facilitate ligand binding and TRIF recruitment, after which the TLR3-TRIF signaling complex recruits LUBAC (for gene activation) or RIPK1/ZBP1 (for inflammatory and death signaling); TLR3 also signals via tyrosine phosphorylation-dependent PI3K/Akt and TBK1 branches to fully activate IRF3 and induce type I IFNs, and controls basal constitutive IFN-β that establishes a standing antiviral state in fibroblasts and CNS neurons; in a TRIF/MyD88-independent branch, activated TLR3 engages c-Src to bi-phasically regulate cell migration, adhesion, and proliferation, and activates NF-κB RelA to drive cardiomyocyte maturation; endogenous ligands including UVB-damaged self-RNA, extracellular RNA released from necrotic/ischemic cells, and endogenous retroviral RNAs from metastatic tumor cells all activate TLR3 to drive inflammation, angiogenesis suppression, or pro-metastatic SLIT2 induction in endothelium.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TLR3 is a double-stranded RNA receptor that initiates innate antiviral and inflammatory programs, recognizing viral dsRNA as well as self-derived ligands and driving an IRF3-dependent type I IFN response that selectively restricts viral replication [#0, #29]. Ligand engagement triggers cooperative receptor assembly: cryo-EM shows TLR3 homodimers cluster along long dsRNA helices with uniform ~103 Å spacing, with longer duplexes nucleating higher-order multimers, providing the structural basis for length-dependent activation; the transmembrane and intracellular domains are dispensable for this clustering [#20, #21]. Productive signaling requires proteolytic and trafficking maturation — the cathepsin-cleaved N-terminal ectodomain fragment remains associated with the C-terminal fragment, and both are needed for IFN-β and NF-κB activation [#6] — together with accessory factors that promote ligand binding and TRIF recruitment, including the FYVE-domain proteins ZFYVE1 and WDFY1, ZCCHC3, and the endosomal maturation factor S100A9 [#7, #8, #9, #10]. Downstream, TLR3 phosphorylation on specific tyrosines bifurcates signaling into a TBK1/IRF3 branch and a PI3K/Akt branch required for full IRF3 phosphorylation and target-gene promoter binding [#1], and the TLR3-TRIF complex engages LUBAC for gene activation versus RIPK1/ZBP1 for inflammatory and death signaling [#13, #22]. Beyond canonical antiviral defense, TLR3 controls a basal constitutive IFN-β tone that establishes a standing antiviral state in human fibroblasts and cortical neurons [#19], and acts on diverse self-ligands — UVB-damaged self-RNA, extracellular RNA released during ischemia, and tumor-derived endogenous retroviral RNA — to drive immune suppression, cardiac injury, angiogenesis suppression, or pro-metastatic SLIT2 induction in endothelium [#4, #24, #2, #18]. A TRIF/MyD88-independent branch through c-Src biphasically regulates cell migration, adhesion, and proliferation [#5], and MyD88-dependent TLR3 signaling shapes neuronal dendritic arborization and pruning [#14, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established that TLR3 signaling converges on IRF3 to drive a specific antiviral transcriptional program, defining the receptor's core output as type I IFN induction rather than generic inflammation.\",\n      \"evidence\": \"Genetic loss-of-function, expression profiling, and viral replication assays in macrophages/fibroblasts\",\n      \"pmids\": [\"12354379\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve receptor-proximal events linking dsRNA binding to IRF3\", \"Did not distinguish viral from endogenous ligand recognition\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how TLR3 bifurcates signaling, showing tyrosine phosphorylation drives separable TBK1/IRF3 and PI3K/Akt branches, the latter required for full IRF3 activation and promoter binding.\",\n      \"evidence\": \"Tyrosine phosphosite mutagenesis, PI3K inhibition, and promoter-binding assays\",\n      \"pmids\": [\"15502848\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the kinase phosphorylating TLR3 tyrosines not established\", \"How PI3K recruitment is spatially organized at the receptor unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated CNS-intrinsic TLR3 function by showing microglia mount poly(I:C) responses via TLR3, extending its role beyond classical immune cells.\",\n      \"evidence\": \"WT and TLR3-/- primary microglia and intracerebroventricular poly(I:C) injection\",\n      \"pmids\": [\"16517751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous CNS ligand not defined\", \"Downstream effector program in microglia not fully mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a cell-surface, sequence-independent TLR3 activity by which long extracellular siRNAs suppress neovascularization, with a length threshold matching a modeled 2:1 receptor stoichiometry.\",\n      \"evidence\": \"Mouse CNV models, siRNA length series, TLR3/TRIF KO mice, and pharmacogenetic 412FF variant analysis\",\n      \"pmids\": [\"18368052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling cell-surface TLR3 to anti-angiogenic effectors incomplete\", \"Generality of surface vs endosomal signaling not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Confirmed direct cell-surface TLR3 activation on endothelium, showing 21-nt but not 7-nt siRNA phosphorylates surface TLR3 and triggers apoptosis to suppress hem- and lymphangiogenesis.\",\n      \"evidence\": \"Mouse neovascularization models with surface TLR3 phosphorylation and internalization controls\",\n      \"pmids\": [\"19359485\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor usage at the cell surface vs endosome not delineated\", \"Apoptotic effector pathway not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified TLR3 as a sensor of UVB-damaged self-RNA acting as a DAMP, broadening its ligand repertoire to endogenous noncoding RNA driving sterile inflammation and UV immunosuppression.\",\n      \"evidence\": \"TLR3/TRIF KO mice, purified UVB-irradiated noncoding RNA stimulation, in vivo UVB model\",\n      \"pmids\": [\"22772463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural features of UVB-modified RNA recognized by TLR3 unclear\", \"Whether other damaged self-RNAs share this activity unaddressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Uncovered a TRIF/MyD88-independent branch in which dsRNA-bound TLR3 recruits c-Src to biphasically control migration, adhesion, and proliferation, decoupling some TLR3 outputs from canonical adaptors.\",\n      \"evidence\": \"Co-IP of Src with TLR3, lipid raft fractionation, TRIF/MyD88-deficient cells, migration/adhesion assays\",\n      \"pmids\": [\"22323545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect TLR3-Src association not fully resolved\", \"Physiological context of this branch in vivo unaddressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the post-translational and trafficking requirements for TLR3 activation: the ectodomain dictates plasma-membrane localization (UNC93B1-dependent), the TIR domain selects adaptors, and cathepsin cleavage yields associated N/C fragments both needed for signaling.\",\n      \"evidence\": \"Chimeric receptor and domain-deletion constructs, cleavage-site mapping, UNC93B1 manipulation, confocal localization\",\n      \"pmids\": [\"24651829\", \"25305318\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of cleavage for ligand binding vs signaling not separated\", \"Surface vs endosomal pool contributions to signaling unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established TLR3-TRIF as a driver of cardiac ischemia-reperfusion injury via extracellular RNA, acting upstream of and independent of autocrine type I IFN.\",\n      \"evidence\": \"TLR3-/-, TRIF-/-, IFNAR1-/- I/R mouse models with RNase/DNase treatment and apoptosis readouts\",\n      \"pmids\": [\"24390148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-death effector pathway downstream of TRIF in cardiomyocytes not detailed\", \"Source and identity of injurious extracellular RNA not fully defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified FYVE-domain adaptor WDFY1 as a positive regulator bridging TRIF recruitment to TLR3 (and TLR4), implicating endosomal phosphoinositide-binding proteins in signal assembly.\",\n      \"evidence\": \"Reciprocal co-IP with gain/loss-of-function reporter and cytokine assays\",\n      \"pmids\": [\"25736436\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether WDFY1 acts at the receptor or adaptor level not fully resolved\", \"Single-lab finding without in vivo validation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed S100A9 is required for maturation of TLR3-containing endosomes into late endosomes where TLR3 meets its dsRNA ligand, placing endosomal trafficking control upstream of signaling.\",\n      \"evidence\": \"S100A9-KO macrophages with colocalization microscopy, co-IP, endosomal fractionation, in vivo poly(I:C) challenge\",\n      \"pmids\": [\"26385519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of S100A9-TLR3 interaction not defined\", \"Whether S100A9 acts generally for endosomal TLRs unaddressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified additional accessory factors (ZCCHC3, scavenger receptor SREC-I) that facilitate TRIF recruitment and dsRNA-mediated TLR3 activation, refining the assembly machinery of the signaling complex.\",\n      \"evidence\": \"Co-IP, KO cells/mice, colocalization, and cytokine/reporter assays\",\n      \"pmids\": [\"32133501\", \"25641411\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hierarchy and redundancy among accessory factors not established\", \"Direct vs scaffolded interactions not fully resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved a key signaling decision point by showing LUBAC engagement of the TLR3 complex routes signaling toward gene activation and restrains assembly of a death-inducing complex, with loss of LUBAC driving TLR3-dependent autoinflammatory pathology.\",\n      \"evidence\": \"Co-IP of LUBAC with TLR3 complex, LUBAC-deficient mice, and Tlr3/cpdm double-KO genetic epistasis\",\n      \"pmids\": [\"27810922\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular switch toggling gene-activation vs death complexes not fully defined\", \"Ubiquitin linkage architecture on the TLR3 complex not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated non-immune developmental roles for TLR3, including MyD88-dependent control of neuronal dendritic arborization via DISC1 and RelA-dependent control of cardiomyocyte maturation gene expression.\",\n      \"evidence\": \"MyD88-KO epistasis and DISC1 rescue in neurons; TLR3 inhibition with RelA ChIP at maturation gene promoters\",\n      \"pmids\": [\"27979975\", \"29676038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ligand driving these developmental TLR3 functions unidentified\", \"How a dsRNA receptor couples to developmental transcription unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified ZFYVE1 as a FYVE-domain factor that binds the TLR3 ectodomain and enhances ligand-binding affinity, providing a mechanism for positively tuning TLR3 antiviral signaling.\",\n      \"evidence\": \"Co-IP with domain mapping, ligand-binding affinity assays, and Zfyve1-/- mice\",\n      \"pmids\": [\"31388100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural mode of ZFYVE1-TLR3 binding not resolved\", \"Relationship to WDFY1 function not clarified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed TLR3 in a pro-metastatic circuit, showing endogenous retroviral dsRNA activates endothelial TLR3 to induce SLIT2, which signals via ROBO1 on cancer cells to promote intravasation.\",\n      \"evidence\": \"Mouse tumor models, endothelial ribosome-tagging RNA-seq, endothelial Slit2 conditional KO, and dsRNA/TLR3 epistasis\",\n      \"pmids\": [\"32999457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor branch coupling endothelial TLR3 to SLIT2 transcription not defined\", \"Therapeutic tractability of the axis unaddressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a homeostatic function in which human TLR3 sustains constitutive basal IFN-β and baseline ISG expression, establishing a standing antiviral state in fibroblasts and cortical neurons against multiple virus families.\",\n      \"evidence\": \"TLR3-deficient human fibroblasts and iPSC-derived neurons, Tlr3-/- MEFs, IFN-β ELISA, ISG quantification, WT rescue\",\n      \"pmids\": [\"33393505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous ligand maintaining basal IFN-β not identified\", \"How basal vs induced TLR3 signaling are distinguished mechanistically unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the structural logic of TLR3 activation, showing cooperative homodimer clustering at 103 Å spacing along long dsRNA, with the TM/intracellular domains dispensable for clustering, explaining length-dependent signaling.\",\n      \"evidence\": \"Cryo-EM of full-length TLR3 with ~400-bp poly(I:C) plus domain-deletion validation\",\n      \"pmids\": [\"36371424\", \"36631495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ectodomain clustering templates intracellular adaptor assembly not directly visualized\", \"Stoichiometry of TRIF recruitment per cluster unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Clarified how the TLR3 complex sustains inflammatory output, with ZBP1 delivering RIPK1 to TRIF and promoting RIPK1 M1-ubiquitination, and PKR cooperating with TLR3/TRIF to license caspase-8-dependent apoptosis.\",\n      \"evidence\": \"ZBP1-KO and PKR/TLR3-KO systems with RIPK1-TRIF interaction, ubiquitination, caspase-8, and in vivo readouts\",\n      \"pmids\": [\"35666872\", \"35970851\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Switch between inflammatory and apoptotic TRIF complexes not fully defined\", \"In vivo relevance of PKR-TLR3 synergy beyond cell models unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ligand-induced ectodomain clustering is mechanically transmitted across the membrane to template ordered TRIF/LUBAC versus RIPK1/ZBP1 adaptor complexes — and what endogenous ligand sustains constitutive basal IFN-β and developmental TLR3 functions — remains unresolved.\",\n      \"evidence\": \"Not addressed by current timeline evidence\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the assembled intracellular TLR3-TRIF signaling complex\", \"Endogenous ligand(s) for basal and developmental signaling unidentified\", \"Determinants choosing gene-activation vs death outputs not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 3, 4, 20, 21]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 20]},\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [10, 26]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 3, 6, 11]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [6, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 13, 29, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [13, 22, 23, 24]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 24, 28]}\n    ],\n    \"complexes\": [\"TLR3-TRIF signaling complex\", \"LUBAC (associated)\"],\n    \"partners\": [\"TRIF\", \"WDFY1\", \"ZFYVE1\", \"ZCCHC3\", \"S100A9\", \"SRC\", \"ZBP1\", \"UNC93B1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}