{"gene":"TLR6","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1999,"finding":"TLR6 is a type-I transmembrane receptor containing an extracellular leucine-rich repeat (LRR) domain and a cytoplasmic TIR domain; constitutively active TLR6 activates both NF-κB and JNK signaling pathways.","method":"Molecular cloning, constitutively active construct transfection, NF-κB and JNK reporter assays","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular cloning with functional overexpression assays in a single study, two orthogonal signaling readouts (NF-κB and JNK)","pmids":["10231569"],"is_preprint":false},{"year":2001,"finding":"TLR6 functionally cooperates with TLR2 to enhance the inflammatory response to phenol-soluble modulin from Staphylococcus epidermidis; TLR1 inhibits the same TLR2-mediated response, demonstrating opposing functional interactions with TLR2.","method":"Transfection of TLR constructs into reporter cells, NF-κB activation assays, gain-of-function co-expression","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional interactions demonstrated with multiple receptor combinations, replicated conceptually across multiple subsequent studies","pmids":["11123271"],"is_preprint":false},{"year":2004,"finding":"TLR2 and TLR6 together mediate NF-κB activation and apoptosis in response to mycoplasmal diacylated lipoproteins and MALP-2; apoptosis requires MyD88, FADD, and p38 MAPK downstream of TLR2/TLR6.","method":"Co-transfection of TLR2 and TLR6 in HEK293 cells, dominant-negative MyD88/FADD/IRAK-4 constructs, caspase-8 activation assay, p38 MAPK inhibitor","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple dominant-negative constructs and pharmacological inhibitors used orthogonally in a single study to dissect downstream pathway","pmids":["14706104"],"is_preprint":false},{"year":2005,"finding":"TLR6 is expressed on the surface of human monocytes, monocyte-derived immature dendritic cells, and neutrophils (but not B, T, or NK cells), where it co-localizes with TLR2 at the plasma membrane; TLR2/TLR6 signaling occurs at the cell surface without requiring endosomal maturation, and TLR6 is required for recognition of diacylated lipopeptide (MALP-2) and peptidoglycan.","method":"Function-blocking anti-TLR6 mAb generation, flow cytometry, confocal microscopy, cytokine inhibition assay, TLR2 Cys mutant analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (antibody blocking, colocalization microscopy, mutant TLR2) in a single rigorous study","pmids":["15661917"],"is_preprint":false},{"year":2005,"finding":"Mycoplasma pneumoniae F0F1-ATPase, a dipalmitoylated lipoprotein, activates NF-κB through TLR2 in cooperation with both TLR1 and TLR6; the lipid moiety (not the protein) is the active component.","method":"Dominant-negative TLR1 and TLR6 constructs in THP-1 cells, lipoprotein lipase treatment, NF-κB activation assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative constructs plus lipase treatment to identify active moiety, single lab","pmids":["16177110"],"is_preprint":false},{"year":2006,"finding":"Heterodimerization of TLR2 with TLR1 or TLR6 expands the lipopeptide ligand spectrum without inducing different downstream signaling cascades; all TLR2 heterodimers use the same signaling cascade (same MAPK activation and gene expression profile).","method":"Dominant-negative signaling molecule constructs, MAPK immunoblotting, microarray gene expression analysis, multiple synthetic lipopeptide ligands","journal":"Journal of leukocyte biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (dominant negatives, immunoblotting, microarray) in a single comprehensive study","pmids":["18056480"],"is_preprint":false},{"year":2007,"finding":"Innate immune responses to endosymbiotic Wolbachia in Brugia malayi and Onchocerca volvulus filaria are dependent on TLR2-TLR6 heterodimerization and are mediated by adaptor molecules MyD88 and TIRAP/Mal, but not TLR4, TRIF, or TRAM.","method":"TLR and adaptor molecule knockout macrophages (TLR2-/-, TLR4-/-, TLR6-/-, MyD88-/-, TIRAP/Mal-/-, TRIF-/-, TRAM-/-), cytokine production assays, in vivo macrophage migration assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple knockout mouse lines used, in vitro and in vivo readouts, clearly defines required signaling components","pmids":["17202370"],"is_preprint":false},{"year":2007,"finding":"HIF-1α directly binds to HIF-1 binding sites in the TLR6 (and TLR2) promoter and coordinately induces TLR6 expression during hypoxia; conditional HIF-1α knockout abolishes hypoxia-induced TLR6 upregulation in vivo.","method":"Chromatin immunoprecipitation (ChIP), promoter analysis, HIF-1 loss- and gain-of-function mouse models, RT-PCR, protein expression in multiple cell lines","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP combined with conditional knockout in vivo and multiple cell lines, multiple orthogonal methods","pmids":["18159247"],"is_preprint":false},{"year":2008,"finding":"TLR6 blocks TLR1/TLR2-mediated apoptosis in trophoblasts exposed to peptidoglycan, redirecting the response toward NF-κB activation and IL-8/IL-6 secretion; TLR6 thus acts as a functional modulator of TLR1/TLR2 signaling in first trimester trophoblasts.","method":"In vitro human first trimester trophoblast model, antibody blocking experiments, NF-κB activation assay, cytokine ELISA","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — antibody blocking and cytokine readouts, single lab, mechanistic interpretation supported by multiple ligand conditions","pmids":["18424724"],"is_preprint":false},{"year":2008,"finding":"The Chlamydia trachomatis macrophage infectivity potentiator (Mip) lipoprotein activates proinflammatory cytokines through TLR2/TLR1/TLR6 and CD14, but not TLR4; the lipid modification (not protein backbone) is required for this activity.","method":"Lipase treatment of Mip, non-lipidated C20A mutant analysis, TLR-blocking experiments, ELISA cytokine measurement","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — lipidation mutant plus TLR blocking antibodies in a single study, two orthogonal approaches","pmids":["18178856"],"is_preprint":false},{"year":2009,"finding":"MVA poxvirus innate immune sensing in macrophages is mediated by the TLR2-TLR6-MyD88 pathway (for IFNβ-independent chemokine production), MDA-5-IPS-1 (for IFNβ), and NALP3 inflammasome (for IL-1β processing); TLR2/TLR6/MyD88 is required for transcription of the Il1b gene.","method":"Knockout macrophages (TLR2-/-, TLR6-/-, MyD88-/-, TRIF-/-, NALP3-/-), shRNA knockdown of RLRs and inflammasome components, cytokine profiling","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic knockout models plus shRNA, orthogonal pathway dissection, multiple cytokine readouts","pmids":["19543380"],"is_preprint":false},{"year":2011,"finding":"TLR6 signaling (but not TLR2) is specifically required for M. leprae-induced lipid droplet biogenesis in Schwann cells and for bacterial uptake; TLR6-dependent LD formation correlates with increased PGE2 and IL-10 and reduced IL-12 and NO production, promoting bacterial persistence.","method":"TLR6 knockout Schwann cells, inhibitor studies (C-75 fatty acid synthase inhibitor), cytokine ELISA, confocal microscopy of patient nerve sections","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — TLR6 KO cells with multiple functional readouts (LD formation, phagocytosis, cytokines), validated in human patient tissue","pmids":["21813774"],"is_preprint":false},{"year":2011,"finding":"TLR6 activation is required for IL-23 production and Th17 responses in dendritic cells; Tlr6-/- mice show impaired IL-23 and IL-17A levels and reduced dectin-1 expression during fungal asthma, and exogenous IL-23 rescues these defects.","method":"Tlr6-/- mouse models of Aspergillus fumigatus and house dust mite-induced asthma, in vitro DC stimulation assays, exogenous IL-23 treatment rescue experiment","journal":"Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent disease models, in vitro mechanistic validation, and rescue experiment with exogenous IL-23","pmids":["22005301"],"is_preprint":false},{"year":2012,"finding":"The TLR2 R753Q polymorphism impairs agonist-induced tyrosine phosphorylation of TLR2, heterodimerization with TLR6, and recruitment of adaptor proteins MyD88 and Mal/TIRAP, resulting in deficient NF-κB activation, p38 phosphorylation, and IL-8 induction.","method":"Transfection of WT vs R753Q TLR2 in HEK293 cells, co-immunoprecipitation for TLR2/TLR6 dimerization, tyrosine phosphorylation immunoblotting, molecular modeling, NF-κB reporter assay","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — biochemical co-IP for dimerization, phosphorylation assay, molecular modeling, and functional NF-κB assay in a single comprehensive study","pmids":["22992740"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the TIR domain of TLR6 at 2.2 Å resolution reveals a novel homo-dimerization interface critical for interaction with TIR-containing adaptor proteins; structural comparisons identify similarities and differences with other TLR TIR domains.","method":"X-ray crystallography at 2.2 Å resolution, structural comparison with other TIR domains","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure at high resolution, novel dimerization interface identified; functional validation is inferred from structural analysis rather than direct mutagenesis","pmids":["25088687"],"is_preprint":false},{"year":2015,"finding":"Dengue virus NS1 protein activates TLR2 and TLR6 on PBMCs, leading to IL-6 and TNF-α production; blocking TLR2 or TLR6 reduces NS1-stimulated cytokine production. TLR6-/- mice show higher survivability upon DV or NS1 challenge compared to wild-type mice.","method":"Neutralizing antibody blocking, SEAP reporter assay, TLR6-/- mouse survival experiment, ELISA, flow cytometry","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — antibody blocking plus TLR6 KO mouse model plus reporter assay, single lab","pmids":["26226614"],"is_preprint":false},{"year":2015,"finding":"The diacylated lipopeptide BPPcysMPEG signals through TLR2-TLR6 heterodimer (but not TLR1-TLR2) to selectively activate p38MAPK/ATF2, increase IL-12 and iNOS expression, and confer antileishmanial protection; TLR2-TLR2 homodimerization increases while TLR2-TLR6 dimerization decreases during L. major infection.","method":"Lentivirus-expressed shRNA knockdown of TLR1, TLR2, TLR6 in BALB/c mice, co-immunoprecipitation of TLR2 dimers, p38MAPK/ATF2 activation assays, cytokine ELISA, parasite burden measurement","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo shRNA knockdowns, co-IP for dimerization changes, multiple signaling and functional readouts in single comprehensive study","pmids":["25194056"],"is_preprint":false},{"year":2017,"finding":"TLR4 and TLR6 form a functional heterodimer at the plasma membrane induced by Aβ peptides; the transmembrane domains of TLR4 and TLR6 are essential for receptor dimerization and activation; inhibiting TLR4-TLR6 assembly using a TLR4-derived peptide reduces proinflammatory mediator secretion from microglia and rescues neurons from death.","method":"Transmembrane peptide interference with dimerization, co-immunoprecipitation, proinflammatory mediator assays in microglia, neuronal death rescue experiment","journal":"Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — peptide interference plus co-IP plus functional cellular readout, single lab, novel TLR4/TLR6 pairing","pmids":["28655763"],"is_preprint":false},{"year":2017,"finding":"Dengue virus NS1 expressed in eukaryotic cells activates immune cells via TLR4 but NOT via TLR2/TLR6; the previously reported TLR2/6 activation by NS1 was attributed to misfolded/contaminated E. coli-derived recombinant NS1 preparations.","method":"TLR knockout macrophages (TLR4-/-, TLR2-/-, TLR6-/-), TLR-blocking antibodies in human PBMCs, properly folded eukaryotic NS1 vs E. coli-derived NS1","journal":"Immunology and cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple KO models plus antibody blocking, explicitly contradicts prior claim about TLR2/6, uses properly validated recombinant protein","pmids":["28220810"],"is_preprint":false},{"year":2023,"finding":"TLR6 is required for MyD88-dependent mitigation of hematopoietic acute radiation syndrome; the synthetic TLR2/TLR6 ligand FSL-1 promotes hematopoietic progenitor cell proliferation and red blood cell development via TLR2/TLR6-MyD88 signaling in mice and nonhuman primates.","method":"Subcutaneous FSL-1 administration in mice and nonhuman primates after radiation; MyD88-dependent mechanism established from prior work; bone marrow aspirate cytology, hematopoietic recovery assays","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two animal models (mice and NHP), multiple hematopoietic readouts, MyD88-dependence established, single lab","pmids":["38051771"],"is_preprint":false},{"year":2024,"finding":"Persistent H. pylori infection reduces TLR6 sensitivity to bacterial components, inducing immune tolerance via the TLR6/JNK signaling pathway; restoration of TLR6 expression potentiates IL-1β and IL-8 production and reduces H. pylori colonization in vivo.","method":"Sustained H. pylori exposure model in GES-1 cells (1–30 generations) and Mongolian gerbils (5–90 weeks), TLR6 overexpression rescue, cytokine measurement, in vivo bacterial colonization assay","journal":"Gastric cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo models with TLR6 restoration rescue experiment, JNK pathway identified, single lab","pmids":["38310631"],"is_preprint":false},{"year":2015,"finding":"Vibrio cholerae cytolysin (VCC) in transmembrane oligomeric form triggers proinflammatory responses in monocytes and macrophages via TLR2/TLR6-dependent signaling involving MyD88/IRAK1/TRAF6, NF-κB, and JNK; p38 MAPK was not required.","method":"TLR2/TLR6 stimulation with VCC oligomers assembled in liposome membranes, pathway inhibitor studies, NF-κB and JNK activation assays","journal":"Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological inhibitors plus reconstituted oligomeric ligand in membranes, single lab, multiple pathway components tested","pmids":["25431887"],"is_preprint":false},{"year":2023,"finding":"BacSp222 bacteriocin is a novel ligand for the TLR2/TLR6 heterodimer (but not TLR2/TLR1, TLR4, or TLR5); it activates NF-κB through TLR2/TLR6, undergoes internalization into cells, and induces MyD88/NF-κB-dependent proinflammatory signaling.","method":"HEK-Blue reporter cells overexpressing TLR2, TLR2/TLR1, TLR2/TLR6; TLR2 antagonist experiments; confocal microscopy for internalization; TNF assay in macrophage lines","journal":"Inflammation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific TLR heterodimer reporter cells plus antagonist validation plus imaging, single lab","pmids":["36964784"],"is_preprint":false}],"current_model":"TLR6 is a type-I transmembrane receptor that primarily functions as a co-receptor by forming heterodimers with TLR2 (and TLR4 in specific contexts) to recognize diacylated bacterial lipopeptides, mycoplasmal lipoproteins, and other PAMPs at the cell surface; ligand-induced TLR2/TLR6 dimerization — dependent on TLR2 tyrosine phosphorylation and requiring a functional TIR-domain homodimerization interface in TLR6 — recruits adaptor proteins MyD88 and TIRAP/Mal to activate NF-κB, JNK, and p38 MAPK signaling, leading to proinflammatory cytokine production, and in specific contexts triggers IL-23 production for Th17 responses, lipid droplet biogenesis, or apoptosis; TLR6 expression is transcriptionally induced during hypoxia via direct HIF-1α binding to the TLR6 promoter, and TLR6/JNK signaling is desensitized during persistent H. pylori infection to mediate immune tolerance."},"narrative":{"mechanistic_narrative":"TLR6 is a type-I transmembrane pattern-recognition receptor with an extracellular leucine-rich repeat domain and a cytoplasmic TIR domain that drives NF-κB and JNK signaling [PMID:10231569]. Its principal mode of action is as a co-receptor: by heterodimerizing with TLR2 it expands the recognized ligand spectrum to diacylated bacterial and mycoplasmal lipopeptides, peptidoglycan, and diverse microbial products, while the partner TLR1 forms an opposing TLR2 heterodimer with distinct ligand specificity [PMID:11123271, PMID:15661917, PMID:18056480]. TLR2/TLR6 dimerization recruits the adaptors MyD88 and TIRAP/Mal to activate NF-κB and the p38/JNK MAPK cascades, and depends on agonist-induced tyrosine phosphorylation of TLR2 — a step impaired by the TLR2 R753Q polymorphism, which abrogates TLR6 heterodimerization and adaptor recruitment [PMID:17202370, PMID:22992740]. A high-resolution TIR-domain crystal structure defines a homo-dimerization interface required for engaging TIR-containing adaptors [PMID:25088687]. Functional outcomes of TLR2/TLR6 signaling are context-dependent, spanning proinflammatory cytokine production, MyD88/FADD/p38-dependent apoptosis [PMID:14706104], IL-23-driven Th17 responses in dendritic cells [PMID:22005301], lipid-droplet biogenesis favoring intracellular bacterial persistence [PMID:21813774], and hematopoietic recovery after radiation injury [PMID:38051771]. TLR6 also pairs with TLR4 at the plasma membrane in response to amyloid-β to drive microglial inflammation [PMID:28655763]. TLR6 expression is transcriptionally induced during hypoxia through direct HIF-1α binding to its promoter [PMID:18159247], and TLR6/JNK signaling is desensitized during persistent H. pylori infection to establish immune tolerance [PMID:38310631].","teleology":[{"year":1999,"claim":"Established that TLR6 is a TIR-domain transmembrane receptor capable of activating innate immune signaling, defining it as a candidate pattern-recognition receptor.","evidence":"Molecular cloning and constitutively active construct transfection with NF-κB and JNK reporter assays","pmids":["10231569"],"confidence":"Medium","gaps":["No natural ligand identified","Activity shown only with a forced constitutively active construct, not native receptor"]},{"year":2001,"claim":"Showed TLR6 acts as a functional partner of TLR2 (and is opposed by TLR1), reframing it from a standalone receptor to a co-receptor that tunes TLR2 responses.","evidence":"Gain-of-function co-expression of TLR constructs with NF-κB activation assays in reporter cells","pmids":["11123271"],"confidence":"High","gaps":["Physical heterodimerization not demonstrated biochemically","Molecular basis of TLR1 vs TLR6 ligand discrimination unresolved"]},{"year":2004,"claim":"Defined the downstream adaptor and effector chain of TLR2/TLR6, establishing that the dimer can drive apoptosis as well as NF-κB activation.","evidence":"Co-transfection with dominant-negative MyD88/FADD/IRAK-4, caspase-8 activation assay, and p38 inhibitor in HEK293 cells","pmids":["14706104"],"confidence":"High","gaps":["Reliance on overexpression and dominant-negatives rather than endogenous signaling","What dictates apoptotic vs proinflammatory outcome not defined"]},{"year":2005,"claim":"Localized TLR6 to the surface of myeloid cells co-clustered with TLR2 and showed signaling occurs at the plasma membrane, establishing where and in which cells the receptor operates.","evidence":"Function-blocking anti-TLR6 mAb, flow cytometry, confocal colocalization, and TLR2 Cys-mutant analysis","pmids":["15661917"],"confidence":"High","gaps":["Stoichiometry and kinetics of TLR2/TLR6 surface assembly not resolved","Receptor trafficking after ligation not characterized"]},{"year":2006,"claim":"Demonstrated that TLR1 and TLR6 heterodimers diversify ligand recognition without diverging in downstream signaling, clarifying that specificity is set at the ectodomain not the effector level.","evidence":"Dominant-negative signaling constructs, MAPK immunoblotting, and microarray expression profiling with synthetic lipopeptides","pmids":["18056480"],"confidence":"High","gaps":["Context-specific divergent outcomes seen in later studies not explained by this model","Structural basis of ligand discrimination not addressed"]},{"year":2007,"claim":"Genetically confirmed the obligate adaptor requirements (MyD88, TIRAP/Mal) and TLR2-TLR6 dependence for sensing a defined pathogen, moving beyond overexpression to knockout validation.","evidence":"Panel of TLR and adaptor knockout macrophages with in vitro cytokine and in vivo migration readouts for Wolbachia","pmids":["17202370"],"confidence":"High","gaps":["Direct TLR6 ligand within the endosymbiont not identified","Relative contribution of TLR6 vs TLR2 not separated"]},{"year":2007,"claim":"Identified transcriptional control of TLR6, showing HIF-1α directly induces its expression under hypoxia and linking innate sensing capacity to the oxygen microenvironment.","evidence":"ChIP, promoter analysis, and conditional HIF-1α gain/loss-of-function mouse models with RT-PCR","pmids":["18159247"],"confidence":"High","gaps":["Functional consequence of hypoxia-induced TLR6 on downstream immunity not quantified","Other transcriptional regulators of TLR6 not mapped"]},{"year":2008,"claim":"Showed TLR6 can redirect TLR1/TLR2 outputs from apoptosis toward NF-κB/cytokine production in trophoblasts, establishing it as a contextual modulator of dimer outcome.","evidence":"Antibody blocking, NF-κB assay, and cytokine ELISA in primary human first-trimester trophoblasts","pmids":["18424724"],"confidence":"Medium","gaps":["Antibody-blocking only, no genetic confirmation","Molecular switch redirecting apoptosis vs NF-κB undefined"]},{"year":2011,"claim":"Separated a TLR6-specific function from TLR2, showing TLR6 alone drives lipid-droplet biogenesis and bacterial uptake that favors pathogen persistence.","evidence":"TLR6 knockout Schwann cells, fatty-acid synthase inhibitor, cytokine ELISA, and confocal imaging of M. leprae patient nerve tissue","pmids":["21813774"],"confidence":"High","gaps":["Signaling route linking TLR6 to lipid-droplet machinery not delineated","Whether this requires TLR2 partnership unresolved"]},{"year":2011,"claim":"Established TLR6 as required for IL-23 production and Th17 polarization, connecting the receptor to adaptive immune outcomes in fungal asthma.","evidence":"Tlr6-/- mouse asthma models, in vitro DC stimulation, and exogenous IL-23 rescue","pmids":["22005301"],"confidence":"High","gaps":["Direct TLR6 ligand driving IL-23 not identified","Mechanism linking TLR6 to dectin-1 expression unknown"]},{"year":2012,"claim":"Provided the biochemical mechanism of heterodimer assembly, showing TLR2 tyrosine phosphorylation gates TLR6 recruitment and adaptor docking, with a disease-associated polymorphism abolishing it.","evidence":"WT vs R753Q TLR2 transfection, co-IP for TLR2/TLR6 dimerization, phosphotyrosine immunoblotting, molecular modeling, and NF-κB reporter assay","pmids":["22992740"],"confidence":"High","gaps":["Kinase responsible for TLR2 phosphorylation not identified","TLR6-side residues required for dimerization not mutationally tested here"]},{"year":2014,"claim":"Provided structural insight into the TLR6 TIR domain, defining a homo-dimerization interface needed for adaptor engagement.","evidence":"X-ray crystallography at 2.2 Å and comparative structural analysis","pmids":["25088687"],"confidence":"High","gaps":["Functional role of the interface inferred from structure, not validated by mutagenesis","No structure of the full-length receptor or TLR2/TLR6 complex"]},{"year":2015,"claim":"Extended ligand repertoire to pore-forming toxins and viral/bacterial products and showed selective signaling biases, demonstrating ligand-tuned outputs through TLR2/TLR6.","evidence":"shRNA knockdowns, co-IP of TLR2 dimers, p38/ATF2 and NF-κB/JNK assays, and reconstituted oligomeric toxin ligands across Leishmania, Vibrio cytolysin, and Dengue NS1 systems","pmids":["25194056","25431887","26226614"],"confidence":"Medium","gaps":["Direct receptor binding for several ligands not demonstrated","The Dengue NS1 claim was later contradicted"]},{"year":2017,"claim":"Identified a non-TLR2 partner, showing TLR6 pairs with TLR4 in response to amyloid-β to drive neuroinflammation, broadening TLR6's dimerization repertoire.","evidence":"Transmembrane-peptide interference, co-IP, microglial proinflammatory assays, and neuronal death rescue","pmids":["28655763"],"confidence":"Medium","gaps":["Single-lab finding without genetic confirmation","Adaptor usage by the TLR4/TLR6 dimer not defined"]},{"year":2017,"claim":"Corrected a prior ligand assignment, showing properly folded eukaryotic Dengue NS1 signals through TLR4 rather than TLR2/TLR6 and that the earlier TLR2/6 claim arose from contaminated E. coli protein.","evidence":"TLR4/TLR2/TLR6 knockout macrophages and blocking antibodies comparing eukaryotic vs E. coli-derived NS1","pmids":["28220810"],"confidence":"High","gaps":["Highlights that recombinant-protein ligand assignments require endotoxin/folding controls","Does not exclude TLR2/6 roles for other viral proteins"]},{"year":2023,"claim":"Established a regenerative role, showing TLR6 is required for MyD88-dependent hematopoietic recovery and that an FSL-1 agonist promotes progenitor proliferation across species.","evidence":"FSL-1 administration in irradiated mice and nonhuman primates with bone marrow cytology and hematopoietic recovery assays","pmids":["38051771"],"confidence":"Medium","gaps":["Direct cellular target of TLR2/TLR6 in hematopoiesis not pinpointed","Single-lab study"]},{"year":2024,"claim":"Demonstrated dynamic regulation of TLR6 responsiveness, showing persistent H. pylori desensitizes TLR6/JNK signaling to enforce immune tolerance, reversible by restoring TLR6.","evidence":"Sustained H. pylori exposure in GES-1 cells and Mongolian gerbils with TLR6 overexpression rescue, cytokine measurement, and colonization assays","pmids":["38310631"],"confidence":"Medium","gaps":["Mechanism reducing TLR6 sensitivity not defined","Single-lab study"]},{"year":null,"claim":"How TLR6 ectodomain residues discriminate diacylated ligands and how a single TLR2/TLR6 dimer is steered toward divergent outcomes (NF-κB, apoptosis, IL-23, lipid droplets) remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of the assembled TLR2/TLR6 ectodomain-ligand complex in the corpus","Molecular switch determining output specificity unknown","Kinase phosphorylating TLR2 to license dimerization unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,5,13]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[4,5,9]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,17]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,6,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,13,21]}],"complexes":["TLR2/TLR6 heterodimer","TLR4/TLR6 heterodimer"],"partners":["TLR2","TLR1","TLR4","MYD88","TIRAP","FADD"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y2C9","full_name":"Toll-like receptor 6","aliases":[],"length_aa":796,"mass_kda":91.9,"function":"Participates in the innate immune response to Gram-positive bacteria and fungi. Specifically recognizes diacylated and, to a lesser extent, triacylated lipopeptides (PubMed:20037584). In response to diacylated lipopeptides, forms the activation cluster TLR2:TLR6:CD14:CD36, this cluster triggers signaling from the cell surface and subsequently is targeted to the Golgi in a lipid-raft dependent pathway (PubMed:16880211). Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. Recognizes mycoplasmal macrophage-activating lipopeptide-2kD (MALP-2), soluble tuberculosis factor (STF), phenol-soluble modulin (PSM) and B.burgdorferi outer surface protein A lipoprotein (OspA-L) cooperatively with TLR2 (PubMed:11441107). In complex with TLR4, promotes sterile inflammation in monocytes/macrophages in response to oxidized low-density lipoprotein (oxLDL) or amyloid-beta 42. In this context, the initial signal is provided by oxLDL- or amyloid-beta 42-binding to CD36. This event induces the formation of a heterodimer of TLR4 and TLR6, which is rapidly internalized and triggers inflammatory response, leading to the NF-kappa-B-dependent production of CXCL1, CXCL2 and CCL9 cytokines, via MYD88 signaling pathway, and CCL5 cytokine, via TICAM1 signaling pathway, as well as IL1B secretion (PubMed:11441107, PubMed:20037584)","subcellular_location":"Cell membrane; Cytoplasmic vesicle, phagosome membrane; Membrane raft; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/Q9Y2C9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TLR6","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TLR6","total_profiled":1310},"omim":[{"mim_id":"609888","title":"LEPROSY, SUSCEPTIBILITY TO, 1; LPRS1","url":"https://www.omim.org/entry/609888"},{"mim_id":"606270","title":"TOLL-LIKE RECEPTOR 10; TLR10","url":"https://www.omim.org/entry/606270"},{"mim_id":"605403","title":"TOLL-LIKE RECEPTOR 6; TLR6","url":"https://www.omim.org/entry/605403"},{"mim_id":"603028","title":"TOLL-LIKE RECEPTOR 2; TLR2","url":"https://www.omim.org/entry/603028"},{"mim_id":"602170","title":"MYD88 INNATE IMMUNE SIGNAL TRANSDUCTION ADAPTOR; MYD88","url":"https://www.omim.org/entry/602170"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid 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TLR-9 and Associated Up-Regulation of Programmed Cell Death 1 Receptor (PD-1) and Its Ligand (PD-L1) in Lung Sepsis.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40076895","citation_count":2,"is_preprint":false},{"pmid":"40144379","id":"PMC_40144379","title":"Features of toll-like receptor genes (TLR-2, TLR-3, TLR-4 and TLR-6) polymorphism in open-angle glaucoma patients.","date":"2025","source":"Vavilovskii zhurnal genetiki i selektsii","url":"https://pubmed.ncbi.nlm.nih.gov/40144379","citation_count":2,"is_preprint":false},{"pmid":"26997964","id":"PMC_26997964","title":"TLR-6 SNP P249S is associated with healthy aging in nonsmoking Eastern European Caucasians - A cohort study.","date":"2016","source":"Immunity & ageing : I & A","url":"https://pubmed.ncbi.nlm.nih.gov/26997964","citation_count":2,"is_preprint":false},{"pmid":"38872374","id":"PMC_38872374","title":"Deleterious intestinal inflammation in neonatal mice 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\"finding\": \"TLR6 is a type-I transmembrane receptor containing an extracellular leucine-rich repeat (LRR) domain and a cytoplasmic TIR domain; constitutively active TLR6 activates both NF-κB and JNK signaling pathways.\",\n      \"method\": \"Molecular cloning, constitutively active construct transfection, NF-κB and JNK reporter assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular cloning with functional overexpression assays in a single study, two orthogonal signaling readouts (NF-κB and JNK)\",\n      \"pmids\": [\"10231569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TLR6 functionally cooperates with TLR2 to enhance the inflammatory response to phenol-soluble modulin from Staphylococcus epidermidis; TLR1 inhibits the same TLR2-mediated response, demonstrating opposing functional interactions with TLR2.\",\n      \"method\": \"Transfection of TLR constructs into reporter cells, NF-κB activation assays, gain-of-function co-expression\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional interactions demonstrated with multiple receptor combinations, replicated conceptually across multiple subsequent studies\",\n      \"pmids\": [\"11123271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TLR2 and TLR6 together mediate NF-κB activation and apoptosis in response to mycoplasmal diacylated lipoproteins and MALP-2; apoptosis requires MyD88, FADD, and p38 MAPK downstream of TLR2/TLR6.\",\n      \"method\": \"Co-transfection of TLR2 and TLR6 in HEK293 cells, dominant-negative MyD88/FADD/IRAK-4 constructs, caspase-8 activation assay, p38 MAPK inhibitor\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple dominant-negative constructs and pharmacological inhibitors used orthogonally in a single study to dissect downstream pathway\",\n      \"pmids\": [\"14706104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TLR6 is expressed on the surface of human monocytes, monocyte-derived immature dendritic cells, and neutrophils (but not B, T, or NK cells), where it co-localizes with TLR2 at the plasma membrane; TLR2/TLR6 signaling occurs at the cell surface without requiring endosomal maturation, and TLR6 is required for recognition of diacylated lipopeptide (MALP-2) and peptidoglycan.\",\n      \"method\": \"Function-blocking anti-TLR6 mAb generation, flow cytometry, confocal microscopy, cytokine inhibition assay, TLR2 Cys mutant analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (antibody blocking, colocalization microscopy, mutant TLR2) in a single rigorous study\",\n      \"pmids\": [\"15661917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mycoplasma pneumoniae F0F1-ATPase, a dipalmitoylated lipoprotein, activates NF-κB through TLR2 in cooperation with both TLR1 and TLR6; the lipid moiety (not the protein) is the active component.\",\n      \"method\": \"Dominant-negative TLR1 and TLR6 constructs in THP-1 cells, lipoprotein lipase treatment, NF-κB activation assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative constructs plus lipase treatment to identify active moiety, single lab\",\n      \"pmids\": [\"16177110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Heterodimerization of TLR2 with TLR1 or TLR6 expands the lipopeptide ligand spectrum without inducing different downstream signaling cascades; all TLR2 heterodimers use the same signaling cascade (same MAPK activation and gene expression profile).\",\n      \"method\": \"Dominant-negative signaling molecule constructs, MAPK immunoblotting, microarray gene expression analysis, multiple synthetic lipopeptide ligands\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (dominant negatives, immunoblotting, microarray) in a single comprehensive study\",\n      \"pmids\": [\"18056480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Innate immune responses to endosymbiotic Wolbachia in Brugia malayi and Onchocerca volvulus filaria are dependent on TLR2-TLR6 heterodimerization and are mediated by adaptor molecules MyD88 and TIRAP/Mal, but not TLR4, TRIF, or TRAM.\",\n      \"method\": \"TLR and adaptor molecule knockout macrophages (TLR2-/-, TLR4-/-, TLR6-/-, MyD88-/-, TIRAP/Mal-/-, TRIF-/-, TRAM-/-), cytokine production assays, in vivo macrophage migration assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple knockout mouse lines used, in vitro and in vivo readouts, clearly defines required signaling components\",\n      \"pmids\": [\"17202370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIF-1α directly binds to HIF-1 binding sites in the TLR6 (and TLR2) promoter and coordinately induces TLR6 expression during hypoxia; conditional HIF-1α knockout abolishes hypoxia-induced TLR6 upregulation in vivo.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), promoter analysis, HIF-1 loss- and gain-of-function mouse models, RT-PCR, protein expression in multiple cell lines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP combined with conditional knockout in vivo and multiple cell lines, multiple orthogonal methods\",\n      \"pmids\": [\"18159247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TLR6 blocks TLR1/TLR2-mediated apoptosis in trophoblasts exposed to peptidoglycan, redirecting the response toward NF-κB activation and IL-8/IL-6 secretion; TLR6 thus acts as a functional modulator of TLR1/TLR2 signaling in first trimester trophoblasts.\",\n      \"method\": \"In vitro human first trimester trophoblast model, antibody blocking experiments, NF-κB activation assay, cytokine ELISA\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — antibody blocking and cytokine readouts, single lab, mechanistic interpretation supported by multiple ligand conditions\",\n      \"pmids\": [\"18424724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The Chlamydia trachomatis macrophage infectivity potentiator (Mip) lipoprotein activates proinflammatory cytokines through TLR2/TLR1/TLR6 and CD14, but not TLR4; the lipid modification (not protein backbone) is required for this activity.\",\n      \"method\": \"Lipase treatment of Mip, non-lipidated C20A mutant analysis, TLR-blocking experiments, ELISA cytokine measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — lipidation mutant plus TLR blocking antibodies in a single study, two orthogonal approaches\",\n      \"pmids\": [\"18178856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MVA poxvirus innate immune sensing in macrophages is mediated by the TLR2-TLR6-MyD88 pathway (for IFNβ-independent chemokine production), MDA-5-IPS-1 (for IFNβ), and NALP3 inflammasome (for IL-1β processing); TLR2/TLR6/MyD88 is required for transcription of the Il1b gene.\",\n      \"method\": \"Knockout macrophages (TLR2-/-, TLR6-/-, MyD88-/-, TRIF-/-, NALP3-/-), shRNA knockdown of RLRs and inflammasome components, cytokine profiling\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic knockout models plus shRNA, orthogonal pathway dissection, multiple cytokine readouts\",\n      \"pmids\": [\"19543380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TLR6 signaling (but not TLR2) is specifically required for M. leprae-induced lipid droplet biogenesis in Schwann cells and for bacterial uptake; TLR6-dependent LD formation correlates with increased PGE2 and IL-10 and reduced IL-12 and NO production, promoting bacterial persistence.\",\n      \"method\": \"TLR6 knockout Schwann cells, inhibitor studies (C-75 fatty acid synthase inhibitor), cytokine ELISA, confocal microscopy of patient nerve sections\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TLR6 KO cells with multiple functional readouts (LD formation, phagocytosis, cytokines), validated in human patient tissue\",\n      \"pmids\": [\"21813774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TLR6 activation is required for IL-23 production and Th17 responses in dendritic cells; Tlr6-/- mice show impaired IL-23 and IL-17A levels and reduced dectin-1 expression during fungal asthma, and exogenous IL-23 rescues these defects.\",\n      \"method\": \"Tlr6-/- mouse models of Aspergillus fumigatus and house dust mite-induced asthma, in vitro DC stimulation assays, exogenous IL-23 treatment rescue experiment\",\n      \"journal\": \"Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent disease models, in vitro mechanistic validation, and rescue experiment with exogenous IL-23\",\n      \"pmids\": [\"22005301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The TLR2 R753Q polymorphism impairs agonist-induced tyrosine phosphorylation of TLR2, heterodimerization with TLR6, and recruitment of adaptor proteins MyD88 and Mal/TIRAP, resulting in deficient NF-κB activation, p38 phosphorylation, and IL-8 induction.\",\n      \"method\": \"Transfection of WT vs R753Q TLR2 in HEK293 cells, co-immunoprecipitation for TLR2/TLR6 dimerization, tyrosine phosphorylation immunoblotting, molecular modeling, NF-κB reporter assay\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical co-IP for dimerization, phosphorylation assay, molecular modeling, and functional NF-κB assay in a single comprehensive study\",\n      \"pmids\": [\"22992740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the TIR domain of TLR6 at 2.2 Å resolution reveals a novel homo-dimerization interface critical for interaction with TIR-containing adaptor proteins; structural comparisons identify similarities and differences with other TLR TIR domains.\",\n      \"method\": \"X-ray crystallography at 2.2 Å resolution, structural comparison with other TIR domains\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure at high resolution, novel dimerization interface identified; functional validation is inferred from structural analysis rather than direct mutagenesis\",\n      \"pmids\": [\"25088687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dengue virus NS1 protein activates TLR2 and TLR6 on PBMCs, leading to IL-6 and TNF-α production; blocking TLR2 or TLR6 reduces NS1-stimulated cytokine production. TLR6-/- mice show higher survivability upon DV or NS1 challenge compared to wild-type mice.\",\n      \"method\": \"Neutralizing antibody blocking, SEAP reporter assay, TLR6-/- mouse survival experiment, ELISA, flow cytometry\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — antibody blocking plus TLR6 KO mouse model plus reporter assay, single lab\",\n      \"pmids\": [\"26226614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The diacylated lipopeptide BPPcysMPEG signals through TLR2-TLR6 heterodimer (but not TLR1-TLR2) to selectively activate p38MAPK/ATF2, increase IL-12 and iNOS expression, and confer antileishmanial protection; TLR2-TLR2 homodimerization increases while TLR2-TLR6 dimerization decreases during L. major infection.\",\n      \"method\": \"Lentivirus-expressed shRNA knockdown of TLR1, TLR2, TLR6 in BALB/c mice, co-immunoprecipitation of TLR2 dimers, p38MAPK/ATF2 activation assays, cytokine ELISA, parasite burden measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo shRNA knockdowns, co-IP for dimerization changes, multiple signaling and functional readouts in single comprehensive study\",\n      \"pmids\": [\"25194056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TLR4 and TLR6 form a functional heterodimer at the plasma membrane induced by Aβ peptides; the transmembrane domains of TLR4 and TLR6 are essential for receptor dimerization and activation; inhibiting TLR4-TLR6 assembly using a TLR4-derived peptide reduces proinflammatory mediator secretion from microglia and rescues neurons from death.\",\n      \"method\": \"Transmembrane peptide interference with dimerization, co-immunoprecipitation, proinflammatory mediator assays in microglia, neuronal death rescue experiment\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — peptide interference plus co-IP plus functional cellular readout, single lab, novel TLR4/TLR6 pairing\",\n      \"pmids\": [\"28655763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Dengue virus NS1 expressed in eukaryotic cells activates immune cells via TLR4 but NOT via TLR2/TLR6; the previously reported TLR2/6 activation by NS1 was attributed to misfolded/contaminated E. coli-derived recombinant NS1 preparations.\",\n      \"method\": \"TLR knockout macrophages (TLR4-/-, TLR2-/-, TLR6-/-), TLR-blocking antibodies in human PBMCs, properly folded eukaryotic NS1 vs E. coli-derived NS1\",\n      \"journal\": \"Immunology and cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple KO models plus antibody blocking, explicitly contradicts prior claim about TLR2/6, uses properly validated recombinant protein\",\n      \"pmids\": [\"28220810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TLR6 is required for MyD88-dependent mitigation of hematopoietic acute radiation syndrome; the synthetic TLR2/TLR6 ligand FSL-1 promotes hematopoietic progenitor cell proliferation and red blood cell development via TLR2/TLR6-MyD88 signaling in mice and nonhuman primates.\",\n      \"method\": \"Subcutaneous FSL-1 administration in mice and nonhuman primates after radiation; MyD88-dependent mechanism established from prior work; bone marrow aspirate cytology, hematopoietic recovery assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two animal models (mice and NHP), multiple hematopoietic readouts, MyD88-dependence established, single lab\",\n      \"pmids\": [\"38051771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Persistent H. pylori infection reduces TLR6 sensitivity to bacterial components, inducing immune tolerance via the TLR6/JNK signaling pathway; restoration of TLR6 expression potentiates IL-1β and IL-8 production and reduces H. pylori colonization in vivo.\",\n      \"method\": \"Sustained H. pylori exposure model in GES-1 cells (1–30 generations) and Mongolian gerbils (5–90 weeks), TLR6 overexpression rescue, cytokine measurement, in vivo bacterial colonization assay\",\n      \"journal\": \"Gastric cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo models with TLR6 restoration rescue experiment, JNK pathway identified, single lab\",\n      \"pmids\": [\"38310631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Vibrio cholerae cytolysin (VCC) in transmembrane oligomeric form triggers proinflammatory responses in monocytes and macrophages via TLR2/TLR6-dependent signaling involving MyD88/IRAK1/TRAF6, NF-κB, and JNK; p38 MAPK was not required.\",\n      \"method\": \"TLR2/TLR6 stimulation with VCC oligomers assembled in liposome membranes, pathway inhibitor studies, NF-κB and JNK activation assays\",\n      \"journal\": \"Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological inhibitors plus reconstituted oligomeric ligand in membranes, single lab, multiple pathway components tested\",\n      \"pmids\": [\"25431887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BacSp222 bacteriocin is a novel ligand for the TLR2/TLR6 heterodimer (but not TLR2/TLR1, TLR4, or TLR5); it activates NF-κB through TLR2/TLR6, undergoes internalization into cells, and induces MyD88/NF-κB-dependent proinflammatory signaling.\",\n      \"method\": \"HEK-Blue reporter cells overexpressing TLR2, TLR2/TLR1, TLR2/TLR6; TLR2 antagonist experiments; confocal microscopy for internalization; TNF assay in macrophage lines\",\n      \"journal\": \"Inflammation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific TLR heterodimer reporter cells plus antagonist validation plus imaging, single lab\",\n      \"pmids\": [\"36964784\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TLR6 is a type-I transmembrane receptor that primarily functions as a co-receptor by forming heterodimers with TLR2 (and TLR4 in specific contexts) to recognize diacylated bacterial lipopeptides, mycoplasmal lipoproteins, and other PAMPs at the cell surface; ligand-induced TLR2/TLR6 dimerization — dependent on TLR2 tyrosine phosphorylation and requiring a functional TIR-domain homodimerization interface in TLR6 — recruits adaptor proteins MyD88 and TIRAP/Mal to activate NF-κB, JNK, and p38 MAPK signaling, leading to proinflammatory cytokine production, and in specific contexts triggers IL-23 production for Th17 responses, lipid droplet biogenesis, or apoptosis; TLR6 expression is transcriptionally induced during hypoxia via direct HIF-1α binding to the TLR6 promoter, and TLR6/JNK signaling is desensitized during persistent H. pylori infection to mediate immune tolerance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TLR6 is a type-I transmembrane pattern-recognition receptor with an extracellular leucine-rich repeat domain and a cytoplasmic TIR domain that drives NF-\\u03baB and JNK signaling [#0]. Its principal mode of action is as a co-receptor: by heterodimerizing with TLR2 it expands the recognized ligand spectrum to diacylated bacterial and mycoplasmal lipopeptides, peptidoglycan, and diverse microbial products, while the partner TLR1 forms an opposing TLR2 heterodimer with distinct ligand specificity [#1, #3, #5]. TLR2/TLR6 dimerization recruits the adaptors MyD88 and TIRAP/Mal to activate NF-\\u03baB and the p38/JNK MAPK cascades, and depends on agonist-induced tyrosine phosphorylation of TLR2 \\u2014 a step impaired by the TLR2 R753Q polymorphism, which abrogates TLR6 heterodimerization and adaptor recruitment [#6, #13]. A high-resolution TIR-domain crystal structure defines a homo-dimerization interface required for engaging TIR-containing adaptors [#14]. Functional outcomes of TLR2/TLR6 signaling are context-dependent, spanning proinflammatory cytokine production, MyD88/FADD/p38-dependent apoptosis [#2], IL-23-driven Th17 responses in dendritic cells [#12], lipid-droplet biogenesis favoring intracellular bacterial persistence [#11], and hematopoietic recovery after radiation injury [#19]. TLR6 also pairs with TLR4 at the plasma membrane in response to amyloid-\\u03b2 to drive microglial inflammation [#17]. TLR6 expression is transcriptionally induced during hypoxia through direct HIF-1\\u03b1 binding to its promoter [#7], and TLR6/JNK signaling is desensitized during persistent H. pylori infection to establish immune tolerance [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that TLR6 is a TIR-domain transmembrane receptor capable of activating innate immune signaling, defining it as a candidate pattern-recognition receptor.\",\n      \"evidence\": \"Molecular cloning and constitutively active construct transfection with NF-\\u03baB and JNK reporter assays\",\n      \"pmids\": [\"10231569\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No natural ligand identified\", \"Activity shown only with a forced constitutively active construct, not native receptor\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed TLR6 acts as a functional partner of TLR2 (and is opposed by TLR1), reframing it from a standalone receptor to a co-receptor that tunes TLR2 responses.\",\n      \"evidence\": \"Gain-of-function co-expression of TLR constructs with NF-\\u03baB activation assays in reporter cells\",\n      \"pmids\": [\"11123271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical heterodimerization not demonstrated biochemically\", \"Molecular basis of TLR1 vs TLR6 ligand discrimination unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the downstream adaptor and effector chain of TLR2/TLR6, establishing that the dimer can drive apoptosis as well as NF-\\u03baB activation.\",\n      \"evidence\": \"Co-transfection with dominant-negative MyD88/FADD/IRAK-4, caspase-8 activation assay, and p38 inhibitor in HEK293 cells\",\n      \"pmids\": [\"14706104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reliance on overexpression and dominant-negatives rather than endogenous signaling\", \"What dictates apoptotic vs proinflammatory outcome not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized TLR6 to the surface of myeloid cells co-clustered with TLR2 and showed signaling occurs at the plasma membrane, establishing where and in which cells the receptor operates.\",\n      \"evidence\": \"Function-blocking anti-TLR6 mAb, flow cytometry, confocal colocalization, and TLR2 Cys-mutant analysis\",\n      \"pmids\": [\"15661917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and kinetics of TLR2/TLR6 surface assembly not resolved\", \"Receptor trafficking after ligation not characterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated that TLR1 and TLR6 heterodimers diversify ligand recognition without diverging in downstream signaling, clarifying that specificity is set at the ectodomain not the effector level.\",\n      \"evidence\": \"Dominant-negative signaling constructs, MAPK immunoblotting, and microarray expression profiling with synthetic lipopeptides\",\n      \"pmids\": [\"18056480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context-specific divergent outcomes seen in later studies not explained by this model\", \"Structural basis of ligand discrimination not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetically confirmed the obligate adaptor requirements (MyD88, TIRAP/Mal) and TLR2-TLR6 dependence for sensing a defined pathogen, moving beyond overexpression to knockout validation.\",\n      \"evidence\": \"Panel of TLR and adaptor knockout macrophages with in vitro cytokine and in vivo migration readouts for Wolbachia\",\n      \"pmids\": [\"17202370\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TLR6 ligand within the endosymbiont not identified\", \"Relative contribution of TLR6 vs TLR2 not separated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified transcriptional control of TLR6, showing HIF-1\\u03b1 directly induces its expression under hypoxia and linking innate sensing capacity to the oxygen microenvironment.\",\n      \"evidence\": \"ChIP, promoter analysis, and conditional HIF-1\\u03b1 gain/loss-of-function mouse models with RT-PCR\",\n      \"pmids\": [\"18159247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of hypoxia-induced TLR6 on downstream immunity not quantified\", \"Other transcriptional regulators of TLR6 not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed TLR6 can redirect TLR1/TLR2 outputs from apoptosis toward NF-\\u03baB/cytokine production in trophoblasts, establishing it as a contextual modulator of dimer outcome.\",\n      \"evidence\": \"Antibody blocking, NF-\\u03baB assay, and cytokine ELISA in primary human first-trimester trophoblasts\",\n      \"pmids\": [\"18424724\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Antibody-blocking only, no genetic confirmation\", \"Molecular switch redirecting apoptosis vs NF-\\u03baB undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Separated a TLR6-specific function from TLR2, showing TLR6 alone drives lipid-droplet biogenesis and bacterial uptake that favors pathogen persistence.\",\n      \"evidence\": \"TLR6 knockout Schwann cells, fatty-acid synthase inhibitor, cytokine ELISA, and confocal imaging of M. leprae patient nerve tissue\",\n      \"pmids\": [\"21813774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling route linking TLR6 to lipid-droplet machinery not delineated\", \"Whether this requires TLR2 partnership unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established TLR6 as required for IL-23 production and Th17 polarization, connecting the receptor to adaptive immune outcomes in fungal asthma.\",\n      \"evidence\": \"Tlr6-/- mouse asthma models, in vitro DC stimulation, and exogenous IL-23 rescue\",\n      \"pmids\": [\"22005301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TLR6 ligand driving IL-23 not identified\", \"Mechanism linking TLR6 to dectin-1 expression unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the biochemical mechanism of heterodimer assembly, showing TLR2 tyrosine phosphorylation gates TLR6 recruitment and adaptor docking, with a disease-associated polymorphism abolishing it.\",\n      \"evidence\": \"WT vs R753Q TLR2 transfection, co-IP for TLR2/TLR6 dimerization, phosphotyrosine immunoblotting, molecular modeling, and NF-\\u03baB reporter assay\",\n      \"pmids\": [\"22992740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for TLR2 phosphorylation not identified\", \"TLR6-side residues required for dimerization not mutationally tested here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided structural insight into the TLR6 TIR domain, defining a homo-dimerization interface needed for adaptor engagement.\",\n      \"evidence\": \"X-ray crystallography at 2.2 \\u00c5 and comparative structural analysis\",\n      \"pmids\": [\"25088687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the interface inferred from structure, not validated by mutagenesis\", \"No structure of the full-length receptor or TLR2/TLR6 complex\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended ligand repertoire to pore-forming toxins and viral/bacterial products and showed selective signaling biases, demonstrating ligand-tuned outputs through TLR2/TLR6.\",\n      \"evidence\": \"shRNA knockdowns, co-IP of TLR2 dimers, p38/ATF2 and NF-\\u03baB/JNK assays, and reconstituted oligomeric toxin ligands across Leishmania, Vibrio cytolysin, and Dengue NS1 systems\",\n      \"pmids\": [\"25194056\", \"25431887\", \"26226614\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct receptor binding for several ligands not demonstrated\", \"The Dengue NS1 claim was later contradicted\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified a non-TLR2 partner, showing TLR6 pairs with TLR4 in response to amyloid-\\u03b2 to drive neuroinflammation, broadening TLR6's dimerization repertoire.\",\n      \"evidence\": \"Transmembrane-peptide interference, co-IP, microglial proinflammatory assays, and neuronal death rescue\",\n      \"pmids\": [\"28655763\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding without genetic confirmation\", \"Adaptor usage by the TLR4/TLR6 dimer not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Corrected a prior ligand assignment, showing properly folded eukaryotic Dengue NS1 signals through TLR4 rather than TLR2/TLR6 and that the earlier TLR2/6 claim arose from contaminated E. coli protein.\",\n      \"evidence\": \"TLR4/TLR2/TLR6 knockout macrophages and blocking antibodies comparing eukaryotic vs E. coli-derived NS1\",\n      \"pmids\": [\"28220810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Highlights that recombinant-protein ligand assignments require endotoxin/folding controls\", \"Does not exclude TLR2/6 roles for other viral proteins\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established a regenerative role, showing TLR6 is required for MyD88-dependent hematopoietic recovery and that an FSL-1 agonist promotes progenitor proliferation across species.\",\n      \"evidence\": \"FSL-1 administration in irradiated mice and nonhuman primates with bone marrow cytology and hematopoietic recovery assays\",\n      \"pmids\": [\"38051771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct cellular target of TLR2/TLR6 in hematopoiesis not pinpointed\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated dynamic regulation of TLR6 responsiveness, showing persistent H. pylori desensitizes TLR6/JNK signaling to enforce immune tolerance, reversible by restoring TLR6.\",\n      \"evidence\": \"Sustained H. pylori exposure in GES-1 cells and Mongolian gerbils with TLR6 overexpression rescue, cytokine measurement, and colonization assays\",\n      \"pmids\": [\"38310631\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism reducing TLR6 sensitivity not defined\", \"Single-lab study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TLR6 ectodomain residues discriminate diacylated ligands and how a single TLR2/TLR6 dimer is steered toward divergent outcomes (NF-\\u03baB, apoptosis, IL-23, lipid droplets) remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the assembled TLR2/TLR6 ectodomain-ligand complex in the corpus\", \"Molecular switch determining output specificity unknown\", \"Kinase phosphorylating TLR2 to license dimerization unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 5, 13]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 6, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 13, 21]}\n    ],\n    \"complexes\": [\n      \"TLR2/TLR6 heterodimer\",\n      \"TLR4/TLR6 heterodimer\"\n    ],\n    \"partners\": [\n      \"TLR2\",\n      \"TLR1\",\n      \"TLR4\",\n      \"MyD88\",\n      \"TIRAP\",\n      \"FADD\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}