{"gene":"TLR7","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2004,"finding":"TLR7 recognizes single-stranded RNA (ssRNA) as a ligand in endosomal compartments, signaling through MyD88 to induce type I IFN and inflammatory cytokines in plasmacytoid dendritic cells during viral infection.","method":"Genetic knockout mice (TLR7-/-, MyD88-/-), cell stimulation assays with ssRNA and influenza virus","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — foundational study using genetic KO mice with defined cellular phenotype, independently replicated across multiple subsequent studies","pmids":["14976261"],"is_preprint":false},{"year":2009,"finding":"The antimicrobial peptide LL37 binds self-RNA released by dying cells, protects it from extracellular degradation, and transports it into endosomal compartments of plasmacytoid dendritic cells where it activates TLR7 to trigger IFN-alpha secretion.","method":"Co-culture assays, co-IP/binding assays, TLR7/8-deficient cells, in vivo psoriatic skin analysis","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (binding assays, KO cell lines, primary cells, in vivo), strong evidence for mechanism","pmids":["19703986"],"is_preprint":false},{"year":2018,"finding":"TLR7 escapes X chromosome inactivation in immune cells (B lymphocytes, monocytes, plasmacytoid dendritic cells) from women and Klinefelter syndrome males, resulting in biallelic TLR7 expression, higher TLR7 protein levels, and enhanced functional responses to TLR7 ligands including preferential enrichment during TLR7-driven plasma cell proliferation and increased IgG class switching.","method":"Single-cell allelic expression analysis, protein quantification by flow cytometry, functional B cell differentiation assays","journal":"Science Immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (single-cell RNA analysis, protein quantification, functional assays) in primary human cells","pmids":["29374079"],"is_preprint":false},{"year":2022,"finding":"A gain-of-function TLR7 variant (Y264H) selectively increases sensing of guanosine and 2',3'-cGMP, drives aberrant survival of BCR-activated B cells, and causes lupus; deficiency of downstream adaptor MyD88 rescues all autoimmune phenotypes.","method":"Human genetic variant identification, knock-in mice, epistasis with MyD88 knockout, B cell functional assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — human mutation identified, causal knock-in mice generated, epistasis with MyD88 established, multiple cellular phenotypes rescued","pmids":["35477763"],"is_preprint":false},{"year":2010,"finding":"TLR7 and TLR9 act in parallel but cross-regulatory pathways in lupus: TLR9 suppresses TLR7-dependent RNA-associated autoantibody production, and disease driven by TLR9 deficiency depends on TLR7 for its manifestation. Aspects of disease independent of both TLRs are mediated by MyD88-independent components.","method":"Genetic epistasis using Tlr7-/-, Tlr9-/-, Tlr7/9-double KO, and Myd88-/- MRL/lpr mice; autoantibody profiling; disease scoring","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — rigorous genetic epistasis in lupus-prone mice with multiple KO combinations and orthogonal readouts","pmids":["20089701"],"is_preprint":false},{"year":2007,"finding":"2'-O-methyl (2'OMe)-modified RNA acts as a potent TLR7 antagonist, inhibiting TLR7-dependent IFN-alpha and IL-6 induction by ssRNA and small-molecule TLR7 agonist loxoribine in human PBMCs, murine DCs, and in vivo, without requiring direct incorporation into immunostimulatory RNA.","method":"In vitro cytokine assays with human PBMCs and murine DCs, in vivo mouse experiments, competitive inhibition assays","journal":"Molecular Therapy","confidence":"High","confidence_rationale":"Tier 2 — multiple cell systems and in vivo validation, multiple orthogonal methods","pmids":["17579574"],"is_preprint":false},{"year":2020,"finding":"TASL (encoded by CXorf21) interacts with the endolysosomal transporter SLC15A4 and contains a conserved pLxIS motif that mediates recruitment and activation of IRF5, functioning as an innate immune adaptor specifically required for TLR7, TLR8, and TLR9 signaling to the IRF pathway without affecting NF-κB or MAPK signaling.","method":"Genetic deletion of SLC15A4 and TASL, extensive TASL mutagenesis, co-immunoprecipitation, cytokine production assays in primary and transformed human immune cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution, mutagenesis, KO cells, multiple orthogonal methods establishing mechanistic pathway","pmids":["32433612"],"is_preprint":false},{"year":2019,"finding":"UNC93B1 specifically limits TLR7 (but not TLR9) signaling by recruiting syntenin-1, which requires phosphorylation of UNC93B1, facilitating sorting of TLR7 into intralumenal vesicles of multivesicular bodies to terminate signaling. Both UNC93B1 and TLR7 are detected in exosomes.","method":"UNC93B1 mutagenesis, syntenin-1 binding assays, exosome fractionation/detection, TLR7-dependent autoimmunity mouse models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (mutagenesis, binding, fractionation, in vivo autoimmunity rescue), mechanistically rigorous","pmids":["31546246"],"is_preprint":false},{"year":2015,"finding":"Guanosine (G), 2'-deoxyguanosine (dG), and modified nucleosides including 7-methylguanosine, 8-hydroxyguanosine (8-OHG), and 8-hydroxydeoxyguanosine (8-OHdG) are endogenous ligands for TLR7; oligoribonucleotides (ORN) strengthen TLR7 interaction with G/dG, and 8-OHdG binds TLR7/ORN complex with measurable affinity by isothermal titration calorimetry.","method":"In vitro cytokine production assays in mouse and human immune cells, isothermal titration calorimetry, Unc93b1 D34A/D34A macrophage studies","journal":"International Immunology","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding (ITC) plus functional assays with primary cells and genetic models","pmids":["26489884"],"is_preprint":false},{"year":2020,"finding":"TLR7 structural analysis combining crystallography and cryo-EM revealed an equilibrium between open and closed conformations of TLR7; antagonists bind a specific pocket and stabilize the open conformation, preventing receptor activation.","method":"X-ray crystallography, cryo-electron microscopy, small-molecule antagonist development and in vivo testing","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 — structural data (crystallography + cryo-EM) combined with functional antagonist validation in vivo","pmids":["33060576"],"is_preprint":false},{"year":2024,"finding":"The lysosomal endonuclease RNase T2, together with 5' exonucleases PLD3 and PLD4, cooperatively generate TLR7 ligands: RNase T2 produces guanosine 2',3'-cyclic monophosphate-terminated RNA fragments, and PLD exonuclease activity releases 2',3'-cGMP to engage TLR7 pocket 1 and generates RNA fragments for pocket 2. PLD enzymes form homodimers with two ligand-binding sites required for activity.","method":"Biochemical reconstitution, structural studies, loss-of-function in cell lines and primary cells, mutagenesis of disease-associated PLD variants","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution, structural studies, mutagenesis, and cell-based validation across multiple orthogonal approaches","pmids":["38697119"],"is_preprint":false},{"year":2024,"finding":"The late endosomal BORC complex and small GTPase Arl8b control intracellular TLR7 levels by regulating receptor turnover through a direct interaction between the TLR7 trafficking factor UNC93B1 and Arl8b; an UNC93B1 mutation causing childhood-onset lupus reduces BORC interaction and leads to endosomal TLR7 accumulation and unrestricted signaling.","method":"Protein interaction studies (direct interaction between UNC93B1 and Arl8b), patient mutation analysis, receptor turnover assays, endosomal fractionation","journal":"Science Immunology","confidence":"High","confidence_rationale":"Tier 2 — direct interaction established biochemically, patient mutation functionally validated, multiple mechanistic readouts","pmids":["38207015"],"is_preprint":false},{"year":2015,"finding":"TREML4 is an essential positive regulator of TLR7 signaling; macrophages from Treml4-/- mice are hyporesponsive to TLR7 agonists, failing to produce type I IFNs due to impaired phosphorylation of STAT1 by p38 MAPK and decreased recruitment of the adaptor MyD88 to TLR7.","method":"Genome-scale shRNA screen, Treml4-/- mice, phosphorylation assays (STAT1, p38), MyD88-TLR7 co-immunoprecipitation","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 — unbiased genome-scale screen validated by KO mice and multiple downstream signaling assays","pmids":["25848864"],"is_preprint":false},{"year":2021,"finding":"SHP2 promotes trafficking of TLR7 from the Golgi to the endosome in macrophages by dephosphorylating TLR7 at Tyr1024, which boosts TLR7 ubiquitination and NF-κB-mediated inflammation; SHP2 inhibition or TLR7 Tyr1024 point mutation attenuates psoriasis-like skin inflammation.","method":"Single-cell RNA sequencing, conditional SHP2 KO mice, TLR7 phosphorylation assays, Tlr7 point-mutant knock-in mice, in vivo psoriasis model","journal":"EMBO Molecular Medicine","confidence":"High","confidence_rationale":"Tier 2 — phosphorylation site identified biochemically, knock-in mice validate functional significance, multiple orthogonal approaches","pmids":["34936223"],"is_preprint":false},{"year":2015,"finding":"TRIM35 negatively regulates TLR7/9-mediated type I IFN production by interacting with IRF7 and promoting K48-linked ubiquitination and proteasome-dependent degradation of IRF7; TRIM35 expression is induced by TLR7/9 stimulation as a negative feedback mechanism.","method":"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, overexpression and knockdown","journal":"FEBS Letters","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and ubiquitination assays, but single lab and limited in vivo validation","pmids":["25907537"],"is_preprint":false},{"year":2019,"finding":"TLR7 signaling drives differentiation of Ly6Chi monocytes into inflammatory hemophagocytes (iHPCs) that internalize red blood cells, causing anemia and thrombocytopenia; IRF5 participates in TLR7-driven iHPC differentiation, and endosomal TLR and MyD88 signaling is required for iHPC development during malarial anemia.","method":"TLR7-overexpressing mice, lineage tracing, IRF5 KO mice, MyD88 KO mice, cell fate mapping","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic KO models, lineage tracing, defined cellular phenotype and mechanism","pmids":["30630901"],"is_preprint":false},{"year":2015,"finding":"B cell autophagy is required for TLR7 activation in B cells and for SLE development; B cell-specific ablation of autophagy (Atg5) in TLR7 transgenic mice eliminates antinuclear antibodies and inflammation, indicating that autophagy delivers RNA ligands to endosomal TLR7.","method":"TLR7 transgenic mice crossed with B cell-specific Atg5 conditional KO (Cd19-Cre Atg5f/f), autoantibody measurement, cytokine profiling, survival analysis","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific genetic deletion with defined mechanistic phenotype and multiple readouts","pmids":["26120731"],"is_preprint":false},{"year":2019,"finding":"TLR7 specifically increases expression of transcription factor FOSL1 in monocytes, which reduces IL-27 and TNF-alpha production; TLR7 (but not TLR8) activation of monocytes stimulates Ca2+ flux that prevents type I IFN responses, demonstrating distinct signaling cascades downstream of TLR7 vs. TLR8.","method":"RNA virus infection of human CD14+ monocytes, TLR7/8 agonists, siRNA knockdown, Ca2+ flux assays, cytokine profiling","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 2 — multiple RNA viruses tested, siRNA validation, defined molecular targets (FOSL1, Ca2+ flux) with functional consequences","pmids":["31662487"],"is_preprint":false},{"year":2014,"finding":"TLR7 and TLR8 ectodomains recognize RNA oligoribonucleotides (ORN) and imidazoquinolines via overlapping and non-overlapping recognition sites; sensing of these two ligand classes triggers distinct downstream phosphorylation and transcriptional events, indicating TLR7/8 can signal in two different modes depending on ligand class.","method":"Proteome-wide phosphoproteomics, genome-wide transcriptomics in primary human monocyte-derived DCs, ectodomain mapping with murine loss-of-function mutations and human SNPs","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — proteomics, transcriptomics, and genetic mapping with multiple ligand classes in primary human cells","pmids":["24813206"],"is_preprint":false},{"year":2012,"finding":"Genome-wide RNAi screening identified 190 cofactors required for TLR7 and TLR9 signaling, including proteins involved in ubiquitin-protein ligase activities, sphingolipid metabolism, chromatin modifications, and ancient stress responses; HRS was characterized as necessary for ubiquitin-dependent TLR9 targeting to the endolysosome.","method":"Genome-wide RNAi screen, cross-profiling against multiple immunoreceptors, functional NF-κB pathway mapping","journal":"Cell Host & Microbe","confidence":"Medium","confidence_rationale":"Tier 2 — unbiased genome-scale screen, but focused validation mainly on TLR9/HRS axis; TLR7 cofactors identified but less deeply validated","pmids":["22423970"],"is_preprint":false},{"year":2008,"finding":"TLR7 and CD40 cooperate in B cells to produce synergistic IL-6 via enhanced JNK and AP-1 (cJun/cFos) activation; dual CD40+TLR7 stimulation markedly enhanced JNK activity and expanded the repertoire of AP-1 dimers compared to single receptor stimulation.","method":"Primary human and mouse B cell stimulation, JNK activity assays, AP-1 activity assays, cytokine measurement","journal":"European Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — defined biochemical mechanism (JNK/AP-1) with primary cells, but single lab","pmids":["18228247"],"is_preprint":false},{"year":2016,"finding":"Structure-guided mutagenesis of human TLR7 identified molecular determinants of GS-9620 binding; TLR7 exists in a ligand-independent oligomeric state, and GS-9620 activation is associated with compound-induced conformational changes; NF-κB and Akt pathways are activated as immediate downstream responses in plasmacytoid DCs.","method":"Structure-guided mutagenesis, subcellular distribution assays, molecular modeling, primary pDC signaling assays","journal":"PLoS ONE","confidence":"Medium","confidence_rationale":"Tier 1–2 — structure-guided mutagenesis and molecular modeling, but limited structural resolution; functional validation in primary cells","pmids":["26784926"],"is_preprint":false},{"year":2017,"finding":"Extracellular miRNAs (miR-34a, -122, -133a, -142, -146a, -208a) induce cytokine production and leukocyte migration through TLR7/MyD88 signaling; this activity requires intact RNA sequences (uridine→adenosine mutation abolishes it) and is absent in TLR7-/- or MyD88-/- cells but preserved in TLR3- or Trif-deficient cells.","method":"TLR7-/-, MyD88-/-, TLR3-/-, TRIF-/- knockout mice, in vivo leukocyte migration assays, sequence mutagenesis of miRNAs, RNase pretreatment controls","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple KO mouse models, sequence-dependence established by mutagenesis, in vivo and in vitro validation","pmids":["28768728"],"is_preprint":false},{"year":2021,"finding":"RNase T2 deficiency in macrophages impairs TLR7 responses while upregulating TLR3 responses; RNase T2 degrades ssRNAs in endosomes/lysosomes generating TLR7 ligands, and its catalytic activity (H122A and C188R but not H69A or E118V mutations impair both RNA degradation and TLR7 rescue) is required for this function.","method":"RNase T2-deficient macrophages, in vitro RNA degradation assays, RNase T2 mutagenesis, subcellular localization by confocal imaging","journal":"International Immunology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro biochemical assays, site-directed mutagenesis, KO cells, localization imaging","pmids":["34161582"],"is_preprint":false},{"year":2024,"finding":"UNC93B1 variants (E92G and R336L) cause selective TLR7 hyperactivation: E92G causes UNC93B1 protein instability and reduced interaction with TLR7, leading to constitutive type I IFN signaling and early-onset SLE, establishing a direct mechanistic link between UNC93B1-TLR7 interaction and receptor activity.","method":"Patient variant identification, mouse macrophage functional assays with variant UNC93B1, protein stability measurements, co-immunoprecipitation of UNC93B1-TLR7 interaction","journal":"Science Immunology","confidence":"High","confidence_rationale":"Tier 2 — patient variants functionally validated, protein interaction measured, selective TLR subtype effects demonstrated","pmids":["38207055"],"is_preprint":false},{"year":2024,"finding":"TLR7 gain-of-function interface mutations (F507S and L528I) at the TLR7 dimerization interface enhance TLR7 signaling, causing early-onset SLE and neurological disease; altered homo-dimerization is predicted to underlie enhanced signaling.","method":"Human genetic variant identification, structural modeling of dimerization interface, patient clinical phenotyping","journal":"Journal of Clinical Immunology","confidence":"Medium","confidence_rationale":"Tier 3 — human variants identified with clinical phenotyping, but dimerization mechanism is predicted/modeled rather than directly measured","pmids":["38324161"],"is_preprint":false},{"year":2019,"finding":"Deoxyguanosine (dG) triggers cytokine production (including type I IFNs, TNF, IL-6) through TLR7 and its adaptor MyD88 in an endosomal maturation-dependent manner, without requiring concurrent provision of RNA, demonstrating that dG is an RNA-independent TLR7 agonist.","method":"Murine bone marrow macrophages and pDCs, human PBMCs, TLR7-/- and MyD88-/- cells, endosomal maturation inhibitors, cytokine assays","journal":"European Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple KO models and cell types, mechanistic pharmacological controls, consistent results","pmids":["31608988"],"is_preprint":false},{"year":2023,"finding":"The female-specific XIST lncRNA is a rich source of TLR7 ligands; XIST RNA stimulates IFN-alpha production by plasmacytoid DCs in a TLR7-dependent manner, and XIST deletion diminishes the ability of whole cellular RNA to activate TLR7.","method":"XIST deletion experiments, pDC stimulation assays with XIST RNA, TLR7-dependence validation, extracellular vesicle enrichment assays","journal":"JCI Insight","confidence":"High","confidence_rationale":"Tier 2 — XIST deletion functionally validated, TLR7 dependence confirmed in primary human pDCs, multiple orthogonal approaches","pmids":["37733447"],"is_preprint":false},{"year":2017,"finding":"TLR7 signaling in T cells inhibits Th17 cell differentiation from naive T cells and IL-17 production via downregulation of STAT3 signaling through induction of SOCS3 and SOCS5, independently of dendritic cell involvement.","method":"In vitro T cell differentiation assays, STAT3 signaling analysis, SOCS3/5 measurement, in vivo EAE model with imiquimod treatment","journal":"Journal of Immunology","confidence":"Medium","confidence_rationale":"Tier 2 — defined molecular pathway (STAT3/SOCS3/5), DC-independent mechanism established, in vivo validation; single lab","pmids":["28652396"],"is_preprint":false},{"year":2018,"finding":"Bruton's tyrosine kinase (Btk) mediates Ser-536 phosphorylation of p65 RelA and subsequent nuclear entry in TLR7/8-stimulated primary human macrophages; this mechanism is distinct from Btk's role in TLR4 signaling where it acts via p38 MAP kinase to stabilize TNF mRNA.","method":"Btk gene overexpression and siRNA knockdown, p65 phosphorylation assays, nuclear translocation assays in primary human macrophages","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 — defined phosphorylation site and nuclear entry mechanism in primary human cells, but single lab study","pmids":["29567473"],"is_preprint":false},{"year":2024,"finding":"Neuronal substance P (SP) acts on tumoral TACR1 receptors to drive death of a TACR1-high cancer cell population; ssRNAs released from dying cells activate neighboring cancer cell TLR7 to non-canonically activate a pro-metastatic gene expression program, promoting breast tumor invasion and metastasis.","method":"3D co-cultures, in vivo mouse mammary tumor models, genetic KO of TLR7, calcium imaging of neurons, TACR1 antagonist treatment","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — multiple in vitro and in vivo models, genetic KO validation, defined signaling axis (SP→TACR1→cell death→ssRNA→TLR7→pro-metastatic program)","pmids":["39112700"],"is_preprint":false},{"year":2022,"finding":"Purine nucleoside phosphorylase (PNP) regulates TLR7 signaling in B lymphocytes and macrophages by controlling levels of (deoxy)guanosine nucleoside ligands; PNP inactivation increases these ligands, promotes germinal center formation without exogenous antigen, and accelerates autoimmune disease.","method":"PNP inhibition/inactivation in B cells and macrophages, TLR7 agonist (deoxyguanosine) level measurement, germinal center formation assays, mouse autoimmunity model","journal":"Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 — mechanistic link between metabolic enzyme and TLR7 ligand levels established, in vivo validation in autoimmune model","pmids":["35653193"],"is_preprint":false},{"year":2013,"finding":"TLR7 drives accumulation of CD11c+ age-associated B cells (ABCs) and autoantibody production in autoimmune-prone mice; depletion of CD11c+ ABCs rapidly reduces autoantibodies, and Mer-/- mice lacking TLR7 fail to develop anti-chromatin IgG antibodies or ABCs.","method":"Genetic cross of Mer-/- with TLR7-/- mice, ABC depletion experiments, autoantibody quantification","journal":"Immunologic Research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis and depletion experiments in vivo, defined cellular mechanism; single lab","pmids":["22945807"],"is_preprint":false},{"year":2015,"finding":"TLR7 expressed on the cell surface of immune cells (not only endolysosomes) can be targeted by an anti-TLR7 antibody that internalizes with TLR7 into endolysosomes, inhibiting TLR7 responses in dendritic cells, macrophages, and B cells both in vitro and in vivo.","method":"Cell surface TLR7 detection by antibody staining, antibody internalization tracking, in vivo cytokine inhibition assays, therapeutic treatment of Unc93b1 D34A/D34A mice","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — multiple cell types, in vivo validation, direct localization experiments with functional consequences","pmids":["25648980"],"is_preprint":false},{"year":2024,"finding":"The X-linked gene Tlr7 regulates sex-specific type I IFN response to myelin; Tlr7 deletion dampens sex differences and protects against demyelination, while TLR7 inhibitor mitigates tau-induced motor impairment and demyelination in male mice.","method":"Single-nuclei transcriptomics, sex chromosome manipulation (FCG model), Tlr7 conditional KO mice, TLR7 inhibitor treatment in demyelination and AD mouse models","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and pharmacological inhibition, single-cell transcriptomics, multiple mouse models with defined sex-specific phenotype","pmids":["39607927"],"is_preprint":false},{"year":2023,"finding":"B cell-intrinsic TLR7 expression is a major driver of lupus in TLR9-deficient MRL/lpr mice; B cell-specific TLR7 deletion greatly improved disease in TLR9-deficient accelerated SLE, revealing a cis regulatory interaction between TLR9 (protective) and TLR7 (pathogenic) within the B cell compartment.","method":"TLR7-floxed allele crossed with CD11c-Cre or CD19-Cre, BM chimera strategy, on MRL/lpr and TLR9-deficient MRL/lpr backgrounds; disease scoring, proteinuria measurement","journal":"JCI Insight","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KO with multiple genetic backgrounds, BM chimera validation, mechanistic epistasis established","pmids":["37606042"],"is_preprint":false}],"current_model":"TLR7 is an endolysosomal pattern recognition receptor that senses single-stranded RNA and guanosine/deoxyguanosine nucleoside ligands (generated by cooperative action of RNase T2, PLD3, and PLD4) through two distinct binding pockets; upon ligand binding, it undergoes conformational change from open to closed state and signals via MyD88 to activate NF-κB and IRF pathways (the latter through the TASL adaptor on SLC15A4), with its surface expression, endosomal trafficking, and signaling threshold controlled by UNC93B1 (which recruits syntenin-1 to sort TLR7 into multivesicular bodies via phosphorylation-dependent mechanisms), BORC/Arl8b-mediated receptor turnover, and SHP2-dependent Tyr1024 dephosphorylation to regulate Golgi-to-endosome trafficking; biallelic TLR7 expression due to X chromosome inactivation escape in female immune cells enhances TLR7-driven responses and contributes to female sex bias in autoimmunity."},"narrative":{"teleology":[{"year":2004,"claim":"Identification of ssRNA as the natural TLR7 ligand and MyD88 as the obligate signaling adaptor established TLR7 as an endosomal nucleic acid sensor mediating antiviral type I IFN production.","evidence":"TLR7-/- and MyD88-/- mice failed to respond to ssRNA or influenza virus with cytokine production","pmids":["14976261"],"confidence":"High","gaps":["Precise RNA sequence or structural motifs recognized by TLR7 not defined","Endosomal delivery mechanism of natural ligands unknown"]},{"year":2007,"claim":"Demonstration that 2'-O-methylation of RNA potently antagonizes TLR7 revealed a chemical basis for self/non-self RNA discrimination and provided the first tool compound for receptor inhibition.","evidence":"2'OMe-modified RNA inhibited TLR7-dependent IFN-α and IL-6 in human PBMCs, murine DCs, and in vivo","pmids":["17579574"],"confidence":"High","gaps":["Direct binding mode of 2'OMe RNA to TLR7 not resolved","Whether 2'OMe modification prevents TLR7 binding or signaling conformational change unclear"]},{"year":2009,"claim":"Discovery that LL37 shuttles self-RNA into endosomes to activate TLR7 explained how endogenous RNA—normally excluded from endosomal compartments—can breach tolerance and drive autoimmune IFN-α production in psoriasis.","evidence":"Co-culture/binding assays, TLR7-deficient cells, and in vivo psoriatic skin analysis","pmids":["19703986"],"confidence":"High","gaps":["Whether other cationic carriers substitute for LL37 in different autoimmune contexts not tested","Relative contribution of TLR7 vs TLR8 in human pDC activation by LL37-RNA complexes unclear"]},{"year":2010,"claim":"Genetic epistasis between TLR7 and TLR9 in lupus-prone mice established that TLR9 restrains TLR7-driven autoimmunity, revealing an unexpected cross-regulatory hierarchy rather than simple redundancy.","evidence":"Tlr7-/-, Tlr9-/-, double-KO, and Myd88-/- MRL/lpr mice with autoantibody profiling and disease scoring","pmids":["20089701"],"confidence":"High","gaps":["Molecular mechanism by which TLR9 suppresses TLR7 signaling not identified","Whether the TLR9-TLR7 hierarchy operates in human lupus unconfirmed"]},{"year":2012,"claim":"A genome-wide RNAi screen cataloged ~190 cofactors for TLR7/9 signaling, revealing dependence on ubiquitin ligases, sphingolipid metabolism, and chromatin modification, greatly expanding the known signaling network.","evidence":"Genome-wide siRNA screen with cross-profiling against multiple immunoreceptors; HRS validated for TLR9 endolysosomal targeting","pmids":["22423970"],"confidence":"Medium","gaps":["Most TLR7-specific cofactors not individually validated","Mechanistic roles of sphingolipid and chromatin regulators in TLR7 signaling undefined"]},{"year":2014,"claim":"Proteome-wide phosphoproteomics and transcriptomics demonstrated that TLR7 can signal in two distinct modes—nucleoside versus oligoribonucleotide—triggering different downstream phosphorylation and transcriptional programs.","evidence":"Phosphoproteomics and transcriptomics in primary human monocyte-derived DCs with multiple ligand classes, plus ectodomain mapping","pmids":["24813206"],"confidence":"High","gaps":["Structural basis for dual-mode signaling not yet resolved at this time","Relative physiological contribution of each mode during infection unknown"]},{"year":2015,"claim":"Identification of guanosine and deoxyguanosine as direct endogenous TLR7 ligands, with ITC-measured binding and cooperative enhancement by oligoribonucleotides, established TLR7 as a dual-ligand receptor with two binding sites.","evidence":"ITC binding, cytokine assays in mouse/human immune cells, Unc93b1 D34A macrophages","pmids":["26489884"],"confidence":"High","gaps":["Structural identity of the two pockets not yet resolved at atomic level","Physiological source of free guanosine in endosomes unclear"]},{"year":2015,"claim":"Discovery that TREML4 is essential for TLR7-induced type I IFN through p38-STAT1 phosphorylation and MyD88 recruitment identified a cell-surface co-receptor that sets TLR7 signaling intensity.","evidence":"Genome-scale shRNA screen validated by Treml4-/- mice, phosphorylation and co-IP assays","pmids":["25848864"],"confidence":"High","gaps":["Direct physical interaction between TREML4 and TLR7 not demonstrated","Whether TREML4 participates in TLR7 endosomal sorting unknown"]},{"year":2015,"claim":"Demonstration that B cell autophagy is required to deliver RNA ligands to endosomal TLR7, and that its ablation eliminates lupus in TLR7-transgenic mice, defined autophagy as a critical upstream ligand-delivery pathway.","evidence":"B cell-specific Atg5 KO crossed to TLR7-transgenic mice; autoantibodies and inflammation abolished","pmids":["26120731"],"confidence":"High","gaps":["Whether autophagy delivers self-RNA, viral RNA, or both to TLR7 not distinguished","Specific autophagic cargo targeting mechanism for TLR7 ligand delivery undefined"]},{"year":2018,"claim":"Demonstration that TLR7 escapes X chromosome inactivation in female immune cells, yielding biallelic expression and enhanced TLR7 responses, provided a molecular explanation for the female sex bias in SLE.","evidence":"Single-cell allelic expression, flow cytometry protein quantification, B cell functional assays in women vs men and Klinefelter males","pmids":["29374079"],"confidence":"High","gaps":["Epigenetic mechanism governing TLR7 XCI escape not defined","Whether biallelic expression is uniform across all immune cell subsets not fully mapped"]},{"year":2019,"claim":"Elucidation of the UNC93B1–syntenin-1 axis for TLR7-selective signal termination revealed a phosphorylation-dependent sorting mechanism that shuttles TLR7 into multivesicular body intralumenal vesicles, explaining how TLR7 (but not TLR9) is restrained.","evidence":"UNC93B1 mutagenesis, syntenin-1 binding, exosome fractionation, in vivo autoimmunity rescue","pmids":["31546246"],"confidence":"High","gaps":["Kinase responsible for UNC93B1 phosphorylation not identified","Whether exosomal release of TLR7 has intercellular signaling consequences unknown"]},{"year":2019,"claim":"Functional demonstration that deoxyguanosine alone—without RNA—activates TLR7 in an endosomal maturation-dependent manner clarified that the nucleoside pocket can independently initiate signaling.","evidence":"TLR7-/- and MyD88-/- murine cells and human PBMCs treated with dG, with endosomal maturation inhibitors","pmids":["31608988"],"confidence":"High","gaps":["Whether RNA-independent dG activation occurs physiologically in vivo not established","Relative potency of dG vs ssRNA+G synergy in natural infection undefined"]},{"year":2019,"claim":"Identification of TLR7-driven differentiation of monocytes into inflammatory hemophagocytes via IRF5 revealed a previously unknown pathogenic cellular output of excessive TLR7 signaling causing cytopenias.","evidence":"TLR7-overexpressing mice, lineage tracing, IRF5-KO and MyD88-KO mice, malarial anemia model","pmids":["30630901"],"confidence":"High","gaps":["Transcriptional program downstream of IRF5 driving hemophagocyte fate not characterized","Relevance to human hemophagocytic syndromes not directly tested"]},{"year":2020,"claim":"Identification of TASL as an endolysosomal adaptor bridging SLC15A4 to IRF5 activation defined a dedicated signaling branch for TLR7-to-IRF pathway signaling that is independent of NF-κB and MAPK.","evidence":"TASL and SLC15A4 knockout, TASL pLxIS motif mutagenesis, co-IP, cytokine assays in human immune cells","pmids":["32433612"],"confidence":"High","gaps":["How TASL is itself activated upon TLR7 engagement not resolved","Whether TASL contributes differentially to TLR7 vs TLR9 signaling outcomes unclear"]},{"year":2020,"claim":"Structural resolution of TLR7 open-to-closed conformational equilibrium by crystallography and cryo-EM explained the activation mechanism and showed that antagonists lock TLR7 in the open (inactive) state.","evidence":"X-ray crystallography, cryo-EM, small-molecule antagonist testing in vivo","pmids":["33060576"],"confidence":"High","gaps":["Full-length TLR7–MyD88 signalosome structure not resolved","How dual ligand binding to the two pockets cooperatively triggers closing not atomically detailed"]},{"year":2021,"claim":"Demonstration that RNase T2 catalytic activity is required to generate TLR7 ligands from ssRNA in endolysosomes placed this nuclease as an obligate upstream processing step.","evidence":"RNase T2-deficient macrophages, RNA degradation assays, catalytic-site mutagenesis","pmids":["34161582"],"confidence":"High","gaps":["Whether RNase T2 products are sufficient without further processing by exonucleases not addressed"]},{"year":2021,"claim":"Identification of SHP2-mediated Tyr1024 dephosphorylation as a mechanism controlling TLR7 Golgi-to-endosome trafficking revealed a phosphorylation-based checkpoint for receptor delivery and inflammatory signaling.","evidence":"Conditional SHP2 KO mice, TLR7 Y1024 knock-in, in vivo psoriasis model","pmids":["34936223"],"confidence":"High","gaps":["Kinase that phosphorylates TLR7 Tyr1024 not identified","Whether this checkpoint operates in all TLR7-expressing cell types not tested"]},{"year":2022,"claim":"Discovery of a TLR7 gain-of-function variant (Y264H) that selectively enhances guanosine sensing and causes monogenic lupus—rescued by MyD88 deletion—provided definitive human genetic proof that TLR7 hyperactivation is sufficient to drive systemic autoimmunity.","evidence":"Patient mutation, knock-in mice, epistasis with MyD88-KO, B cell functional assays","pmids":["35477763"],"confidence":"High","gaps":["Structural basis for Y264H selectivity toward guanosine vs RNA ligands not atomically resolved","Frequency of TLR7 gain-of-function alleles across lupus cohorts not determined"]},{"year":2022,"claim":"Demonstration that purine nucleoside phosphorylase (PNP) controls TLR7 activation by catabolizing guanosine/deoxyguanosine ligands linked metabolic purine salvage to TLR7 signaling threshold regulation.","evidence":"PNP inhibition in B cells/macrophages, nucleoside quantification, germinal center assays, autoimmune mouse model","pmids":["35653193"],"confidence":"High","gaps":["Relative contribution of PNP-regulated dG vs RNA-derived ligands in disease not quantified","Whether PNP deficiency in humans activates TLR7 not directly shown"]},{"year":2023,"claim":"Cell-type-specific deletion established B cell-intrinsic TLR7 as the dominant driver of accelerated lupus in TLR9-deficient mice, confirming that the TLR9–TLR7 cross-regulatory axis operates within the B cell compartment.","evidence":"TLR7-floxed with CD19-Cre on MRL/lpr and TLR9-/- backgrounds, BM chimeras","pmids":["37606042"],"confidence":"High","gaps":["Whether dendritic cell TLR7 contributes independently to the TLR9-deficient phenotype not excluded","Intracellular mechanism of TLR9-mediated TLR7 restraint still undefined"]},{"year":2024,"claim":"Biochemical reconstitution of the RNase T2–PLD3/PLD4 cooperative pathway demonstrated how endosomal nucleases generate both 2',3'-cGMP (pocket 1 ligand) and RNA fragments (pocket 2 ligand) for TLR7, solving the ligand-generation pathway.","evidence":"In vitro reconstitution, structural studies of PLD homodimers, mutagenesis of disease-associated PLD variants, cell-based validation","pmids":["38697119"],"confidence":"High","gaps":["Whether additional endonucleases contribute in specific cell types not tested","Kinetics of ligand generation relative to TLR7 dwell time in endolysosomes unknown"]},{"year":2024,"claim":"Identification of the BORC–Arl8b axis interacting with UNC93B1 to control TLR7 receptor turnover, and validation via a childhood-onset SLE UNC93B1 mutation, defined a second UNC93B1-dependent checkpoint (turnover vs signal termination) for TLR7 dosage.","evidence":"UNC93B1–Arl8b direct interaction, patient mutation analysis, receptor turnover and endosomal fractionation","pmids":["38207015"],"confidence":"High","gaps":["How BORC/Arl8b directs TLR7 to lysosomes for degradation at the molecular level not detailed","Relationship between syntenin-1 MVB sorting and BORC-mediated turnover not integrated"]},{"year":2024,"claim":"TLR7 was shown to mediate a non-canonical cancer cell-intrinsic signaling program in which ssRNA released from dying tumor cells activates TLR7 on neighboring cancer cells to promote invasion and metastasis, expanding TLR7 function beyond immune cells.","evidence":"3D co-cultures, in vivo mammary tumor models, TLR7 genetic KO, defined signaling axis (SP→TACR1→death→ssRNA→TLR7)","pmids":["39112700"],"confidence":"High","gaps":["Whether TLR7 pro-metastatic signaling uses canonical MyD88 or alternative adaptors not specified","Generalizability beyond breast cancer models not established"]},{"year":2024,"claim":"Demonstration that X-linked Tlr7 regulates sex-specific type I IFN responses to myelin and that its deletion or pharmacological inhibition mitigates demyelination extended the sex-biased TLR7 paradigm to neuroinflammatory disease.","evidence":"Single-nuclei transcriptomics, FCG sex-chromosome model, Tlr7 conditional KO, TLR7 inhibitor in demyelination and AD mouse models","pmids":["39607927"],"confidence":"High","gaps":["Whether TLR7 acts in resident microglia, infiltrating monocytes, or both not fully dissected","Human translation of TLR7 inhibition for demyelinating disease not tested"]},{"year":null,"claim":"The full structural basis for cooperative dual-pocket ligand engagement triggering TLR7 dimer closure, the identity of kinases regulating UNC93B1 and TLR7 phosphorylation, and the molecular mechanism of TLR9-mediated TLR7 restraint within B cells remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["Full-length TLR7–MyD88 signalosome structure not available","Kinases for UNC93B1 S550 phosphorylation and TLR7 Tyr1024 phosphorylation unknown","Molecular mechanism of TLR9 cross-regulation of TLR7 undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,8,9,26]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,8,10]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,7,11,13,33]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[7,10,11]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[33]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[7,11]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,6,12,15,17,22]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,6,9,13,18,29]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,25,30,35]}],"complexes":[],"partners":["MYD88","UNC93B1","TASL","SLC15A4","TREML4","PTPN11","ARL8B","IRF5"],"other_free_text":[]},"mechanistic_narrative":"TLR7 is an endolysosomal pattern recognition receptor that detects single-stranded RNA and guanosine/deoxyguanosine nucleoside ligands to initiate innate and adaptive immune responses, with a central role in antiviral defense, B cell activation, and the pathogenesis of systemic lupus erythematosus. TLR7 possesses two ligand-binding pockets: one engages guanosine-derived nucleosides (including 2',3'-cGMP generated cooperatively by RNase T2 and PLD3/PLD4 exonucleases), while the other binds RNA oligonucleotides; ligand engagement drives a conformational shift from an open to a closed dimer state, triggering MyD88-dependent NF-κB activation and IRF5 activation via the SLC15A4–TASL adaptor axis [PMID:14976261, PMID:33060576, PMID:38697119, PMID:32433612]. TLR7 trafficking and signaling thresholds are tightly controlled by UNC93B1, which recruits syntenin-1 to sort TLR7 into multivesicular bodies for signal termination and engages BORC/Arl8b for receptor turnover, while SHP2-mediated dephosphorylation of TLR7 Tyr1024 regulates Golgi-to-endosome transit; loss of these checkpoints—through UNC93B1 or TLR7 gain-of-function mutations—causes childhood-onset SLE [PMID:31546246, PMID:38207015, PMID:34936223, PMID:35477763]. TLR7 escapes X chromosome inactivation in female immune cells, producing biallelic expression that enhances TLR7-driven responses and contributes to the female sex bias in autoimmunity and neuroinflammatory demyelination [PMID:29374079, PMID:39607927]."},"prefetch_data":{"uniprot":{"accession":"Q9NYK1","full_name":"Toll-like receptor 7","aliases":[],"length_aa":1049,"mass_kda":120.9,"function":"Endosomal receptor that plays a key role in innate and adaptive immunity (PubMed:14976261, PubMed:32433612). Controls host immune response against pathogens through recognition of uridine-containing single strand RNAs (ssRNAs) of viral origin or guanosine analogs (PubMed:12738885, PubMed:27742543, PubMed:31608988, PubMed:32706371, PubMed:35477763). Upon binding to agonists, undergoes dimerization that brings TIR domains from the two molecules into direct contact, leading to the recruitment of TIR-containing downstream adapter MYD88 through homotypic interaction (PubMed:27742543). In turn, the Myddosome signaling complex is formed involving IRAK4, IRAK1, TRAF6, TRAF3 leading to activation of downstream transcription factors NF-kappa-B and IRF7 to induce pro-inflammatory cytokines and interferons, respectively (PubMed:27742543, PubMed:32706371). In plasmacytoid dendritic cells, RNASET2 endonuclease cooperates with PLD3 or PLD4 5'->3' exonucleases to process RNA and release 2',3'-cyclic guanosine monophosphate (2',3'-cGMP) and cytidine-rich RNA fragments that occupy TLR7 ligand-binding pockets and trigger a signaling-competent state","subcellular_location":"Endoplasmic reticulum membrane; Endosome; Lysosome; Cytoplasmic vesicle, phagosome","url":"https://www.uniprot.org/uniprotkb/Q9NYK1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TLR7","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TLR7","total_profiled":1310},"omim":[{"mim_id":"621369","title":"SYSTEMIC LUPUS ERYTHEMATOSUS 18; SLEB18","url":"https://www.omim.org/entry/621369"},{"mim_id":"618488","title":"PHOSPHOLIPASE D FAMILY, MEMBER 4; PLD4","url":"https://www.omim.org/entry/618488"},{"mim_id":"616345","title":"IMMUNODEFICIENCY 39, SUSCEPTIBILITY TO VIRAL INFECTIONS; IMD39","url":"https://www.omim.org/entry/616345"},{"mim_id":"615806","title":"SOLUTE CARRIER FAMILY 15 (OLIGOPEPTIDE TRANSPORTER), MEMBER 4; SLC15A4","url":"https://www.omim.org/entry/615806"},{"mim_id":"611020","title":"MICRO RNA 21; MIR21","url":"https://www.omim.org/entry/611020"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"placenta","ntpm":6.0}],"url":"https://www.proteinatlas.org/search/TLR7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9NYK1","domains":[{"cath_id":"3.80.10.10","chopping":"491-612","consensus_level":"medium","plddt":95.9799,"start":491,"end":612},{"cath_id":"-","chopping":"614-686","consensus_level":"medium","plddt":96.5242,"start":614,"end":686},{"cath_id":"3.40.50.10140","chopping":"892-1047","consensus_level":"high","plddt":80.5032,"start":892,"end":1047}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NYK1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NYK1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NYK1-F1-predicted_aligned_error_v6.png","plddt_mean":87.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TLR7","jax_strain_url":"https://www.jax.org/strain/search?query=TLR7"},"sequence":{"accession":"Q9NYK1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NYK1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NYK1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NYK1"}},"corpus_meta":[{"pmid":"14976261","id":"PMC_14976261","title":"Innate 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inflammatory cytokines in plasmacytoid dendritic cells during viral infection.\",\n      \"method\": \"Genetic knockout mice (TLR7-/-, MyD88-/-), cell stimulation assays with ssRNA and influenza virus\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational study using genetic KO mice with defined cellular phenotype, independently replicated across multiple subsequent studies\",\n      \"pmids\": [\"14976261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The antimicrobial peptide LL37 binds self-RNA released by dying cells, protects it from extracellular degradation, and transports it into endosomal compartments of plasmacytoid dendritic cells where it activates TLR7 to trigger IFN-alpha secretion.\",\n      \"method\": \"Co-culture assays, co-IP/binding assays, TLR7/8-deficient cells, in vivo psoriatic skin analysis\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (binding assays, KO cell lines, primary cells, in vivo), strong evidence for mechanism\",\n      \"pmids\": [\"19703986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TLR7 escapes X chromosome inactivation in immune cells (B lymphocytes, monocytes, plasmacytoid dendritic cells) from women and Klinefelter syndrome males, resulting in biallelic TLR7 expression, higher TLR7 protein levels, and enhanced functional responses to TLR7 ligands including preferential enrichment during TLR7-driven plasma cell proliferation and increased IgG class switching.\",\n      \"method\": \"Single-cell allelic expression analysis, protein quantification by flow cytometry, functional B cell differentiation assays\",\n      \"journal\": \"Science Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (single-cell RNA analysis, protein quantification, functional assays) in primary human cells\",\n      \"pmids\": [\"29374079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A gain-of-function TLR7 variant (Y264H) selectively increases sensing of guanosine and 2',3'-cGMP, drives aberrant survival of BCR-activated B cells, and causes lupus; deficiency of downstream adaptor MyD88 rescues all autoimmune phenotypes.\",\n      \"method\": \"Human genetic variant identification, knock-in mice, epistasis with MyD88 knockout, B cell functional assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — human mutation identified, causal knock-in mice generated, epistasis with MyD88 established, multiple cellular phenotypes rescued\",\n      \"pmids\": [\"35477763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TLR7 and TLR9 act in parallel but cross-regulatory pathways in lupus: TLR9 suppresses TLR7-dependent RNA-associated autoantibody production, and disease driven by TLR9 deficiency depends on TLR7 for its manifestation. Aspects of disease independent of both TLRs are mediated by MyD88-independent components.\",\n      \"method\": \"Genetic epistasis using Tlr7-/-, Tlr9-/-, Tlr7/9-double KO, and Myd88-/- MRL/lpr mice; autoantibody profiling; disease scoring\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous genetic epistasis in lupus-prone mice with multiple KO combinations and orthogonal readouts\",\n      \"pmids\": [\"20089701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"2'-O-methyl (2'OMe)-modified RNA acts as a potent TLR7 antagonist, inhibiting TLR7-dependent IFN-alpha and IL-6 induction by ssRNA and small-molecule TLR7 agonist loxoribine in human PBMCs, murine DCs, and in vivo, without requiring direct incorporation into immunostimulatory RNA.\",\n      \"method\": \"In vitro cytokine assays with human PBMCs and murine DCs, in vivo mouse experiments, competitive inhibition assays\",\n      \"journal\": \"Molecular Therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell systems and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"17579574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TASL (encoded by CXorf21) interacts with the endolysosomal transporter SLC15A4 and contains a conserved pLxIS motif that mediates recruitment and activation of IRF5, functioning as an innate immune adaptor specifically required for TLR7, TLR8, and TLR9 signaling to the IRF pathway without affecting NF-κB or MAPK signaling.\",\n      \"method\": \"Genetic deletion of SLC15A4 and TASL, extensive TASL mutagenesis, co-immunoprecipitation, cytokine production assays in primary and transformed human immune cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution, mutagenesis, KO cells, multiple orthogonal methods establishing mechanistic pathway\",\n      \"pmids\": [\"32433612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"UNC93B1 specifically limits TLR7 (but not TLR9) signaling by recruiting syntenin-1, which requires phosphorylation of UNC93B1, facilitating sorting of TLR7 into intralumenal vesicles of multivesicular bodies to terminate signaling. Both UNC93B1 and TLR7 are detected in exosomes.\",\n      \"method\": \"UNC93B1 mutagenesis, syntenin-1 binding assays, exosome fractionation/detection, TLR7-dependent autoimmunity mouse models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (mutagenesis, binding, fractionation, in vivo autoimmunity rescue), mechanistically rigorous\",\n      \"pmids\": [\"31546246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Guanosine (G), 2'-deoxyguanosine (dG), and modified nucleosides including 7-methylguanosine, 8-hydroxyguanosine (8-OHG), and 8-hydroxydeoxyguanosine (8-OHdG) are endogenous ligands for TLR7; oligoribonucleotides (ORN) strengthen TLR7 interaction with G/dG, and 8-OHdG binds TLR7/ORN complex with measurable affinity by isothermal titration calorimetry.\",\n      \"method\": \"In vitro cytokine production assays in mouse and human immune cells, isothermal titration calorimetry, Unc93b1 D34A/D34A macrophage studies\",\n      \"journal\": \"International Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding (ITC) plus functional assays with primary cells and genetic models\",\n      \"pmids\": [\"26489884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TLR7 structural analysis combining crystallography and cryo-EM revealed an equilibrium between open and closed conformations of TLR7; antagonists bind a specific pocket and stabilize the open conformation, preventing receptor activation.\",\n      \"method\": \"X-ray crystallography, cryo-electron microscopy, small-molecule antagonist development and in vivo testing\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural data (crystallography + cryo-EM) combined with functional antagonist validation in vivo\",\n      \"pmids\": [\"33060576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The lysosomal endonuclease RNase T2, together with 5' exonucleases PLD3 and PLD4, cooperatively generate TLR7 ligands: RNase T2 produces guanosine 2',3'-cyclic monophosphate-terminated RNA fragments, and PLD exonuclease activity releases 2',3'-cGMP to engage TLR7 pocket 1 and generates RNA fragments for pocket 2. PLD enzymes form homodimers with two ligand-binding sites required for activity.\",\n      \"method\": \"Biochemical reconstitution, structural studies, loss-of-function in cell lines and primary cells, mutagenesis of disease-associated PLD variants\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution, structural studies, mutagenesis, and cell-based validation across multiple orthogonal approaches\",\n      \"pmids\": [\"38697119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The late endosomal BORC complex and small GTPase Arl8b control intracellular TLR7 levels by regulating receptor turnover through a direct interaction between the TLR7 trafficking factor UNC93B1 and Arl8b; an UNC93B1 mutation causing childhood-onset lupus reduces BORC interaction and leads to endosomal TLR7 accumulation and unrestricted signaling.\",\n      \"method\": \"Protein interaction studies (direct interaction between UNC93B1 and Arl8b), patient mutation analysis, receptor turnover assays, endosomal fractionation\",\n      \"journal\": \"Science Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction established biochemically, patient mutation functionally validated, multiple mechanistic readouts\",\n      \"pmids\": [\"38207015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TREML4 is an essential positive regulator of TLR7 signaling; macrophages from Treml4-/- mice are hyporesponsive to TLR7 agonists, failing to produce type I IFNs due to impaired phosphorylation of STAT1 by p38 MAPK and decreased recruitment of the adaptor MyD88 to TLR7.\",\n      \"method\": \"Genome-scale shRNA screen, Treml4-/- mice, phosphorylation assays (STAT1, p38), MyD88-TLR7 co-immunoprecipitation\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — unbiased genome-scale screen validated by KO mice and multiple downstream signaling assays\",\n      \"pmids\": [\"25848864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SHP2 promotes trafficking of TLR7 from the Golgi to the endosome in macrophages by dephosphorylating TLR7 at Tyr1024, which boosts TLR7 ubiquitination and NF-κB-mediated inflammation; SHP2 inhibition or TLR7 Tyr1024 point mutation attenuates psoriasis-like skin inflammation.\",\n      \"method\": \"Single-cell RNA sequencing, conditional SHP2 KO mice, TLR7 phosphorylation assays, Tlr7 point-mutant knock-in mice, in vivo psoriasis model\",\n      \"journal\": \"EMBO Molecular Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phosphorylation site identified biochemically, knock-in mice validate functional significance, multiple orthogonal approaches\",\n      \"pmids\": [\"34936223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRIM35 negatively regulates TLR7/9-mediated type I IFN production by interacting with IRF7 and promoting K48-linked ubiquitination and proteasome-dependent degradation of IRF7; TRIM35 expression is induced by TLR7/9 stimulation as a negative feedback mechanism.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, overexpression and knockdown\",\n      \"journal\": \"FEBS Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and ubiquitination assays, but single lab and limited in vivo validation\",\n      \"pmids\": [\"25907537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TLR7 signaling drives differentiation of Ly6Chi monocytes into inflammatory hemophagocytes (iHPCs) that internalize red blood cells, causing anemia and thrombocytopenia; IRF5 participates in TLR7-driven iHPC differentiation, and endosomal TLR and MyD88 signaling is required for iHPC development during malarial anemia.\",\n      \"method\": \"TLR7-overexpressing mice, lineage tracing, IRF5 KO mice, MyD88 KO mice, cell fate mapping\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic KO models, lineage tracing, defined cellular phenotype and mechanism\",\n      \"pmids\": [\"30630901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"B cell autophagy is required for TLR7 activation in B cells and for SLE development; B cell-specific ablation of autophagy (Atg5) in TLR7 transgenic mice eliminates antinuclear antibodies and inflammation, indicating that autophagy delivers RNA ligands to endosomal TLR7.\",\n      \"method\": \"TLR7 transgenic mice crossed with B cell-specific Atg5 conditional KO (Cd19-Cre Atg5f/f), autoantibody measurement, cytokine profiling, survival analysis\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific genetic deletion with defined mechanistic phenotype and multiple readouts\",\n      \"pmids\": [\"26120731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TLR7 specifically increases expression of transcription factor FOSL1 in monocytes, which reduces IL-27 and TNF-alpha production; TLR7 (but not TLR8) activation of monocytes stimulates Ca2+ flux that prevents type I IFN responses, demonstrating distinct signaling cascades downstream of TLR7 vs. TLR8.\",\n      \"method\": \"RNA virus infection of human CD14+ monocytes, TLR7/8 agonists, siRNA knockdown, Ca2+ flux assays, cytokine profiling\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple RNA viruses tested, siRNA validation, defined molecular targets (FOSL1, Ca2+ flux) with functional consequences\",\n      \"pmids\": [\"31662487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TLR7 and TLR8 ectodomains recognize RNA oligoribonucleotides (ORN) and imidazoquinolines via overlapping and non-overlapping recognition sites; sensing of these two ligand classes triggers distinct downstream phosphorylation and transcriptional events, indicating TLR7/8 can signal in two different modes depending on ligand class.\",\n      \"method\": \"Proteome-wide phosphoproteomics, genome-wide transcriptomics in primary human monocyte-derived DCs, ectodomain mapping with murine loss-of-function mutations and human SNPs\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics, transcriptomics, and genetic mapping with multiple ligand classes in primary human cells\",\n      \"pmids\": [\"24813206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Genome-wide RNAi screening identified 190 cofactors required for TLR7 and TLR9 signaling, including proteins involved in ubiquitin-protein ligase activities, sphingolipid metabolism, chromatin modifications, and ancient stress responses; HRS was characterized as necessary for ubiquitin-dependent TLR9 targeting to the endolysosome.\",\n      \"method\": \"Genome-wide RNAi screen, cross-profiling against multiple immunoreceptors, functional NF-κB pathway mapping\",\n      \"journal\": \"Cell Host & Microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — unbiased genome-scale screen, but focused validation mainly on TLR9/HRS axis; TLR7 cofactors identified but less deeply validated\",\n      \"pmids\": [\"22423970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TLR7 and CD40 cooperate in B cells to produce synergistic IL-6 via enhanced JNK and AP-1 (cJun/cFos) activation; dual CD40+TLR7 stimulation markedly enhanced JNK activity and expanded the repertoire of AP-1 dimers compared to single receptor stimulation.\",\n      \"method\": \"Primary human and mouse B cell stimulation, JNK activity assays, AP-1 activity assays, cytokine measurement\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined biochemical mechanism (JNK/AP-1) with primary cells, but single lab\",\n      \"pmids\": [\"18228247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Structure-guided mutagenesis of human TLR7 identified molecular determinants of GS-9620 binding; TLR7 exists in a ligand-independent oligomeric state, and GS-9620 activation is associated with compound-induced conformational changes; NF-κB and Akt pathways are activated as immediate downstream responses in plasmacytoid DCs.\",\n      \"method\": \"Structure-guided mutagenesis, subcellular distribution assays, molecular modeling, primary pDC signaling assays\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — structure-guided mutagenesis and molecular modeling, but limited structural resolution; functional validation in primary cells\",\n      \"pmids\": [\"26784926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Extracellular miRNAs (miR-34a, -122, -133a, -142, -146a, -208a) induce cytokine production and leukocyte migration through TLR7/MyD88 signaling; this activity requires intact RNA sequences (uridine→adenosine mutation abolishes it) and is absent in TLR7-/- or MyD88-/- cells but preserved in TLR3- or Trif-deficient cells.\",\n      \"method\": \"TLR7-/-, MyD88-/-, TLR3-/-, TRIF-/- knockout mice, in vivo leukocyte migration assays, sequence mutagenesis of miRNAs, RNase pretreatment controls\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple KO mouse models, sequence-dependence established by mutagenesis, in vivo and in vitro validation\",\n      \"pmids\": [\"28768728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RNase T2 deficiency in macrophages impairs TLR7 responses while upregulating TLR3 responses; RNase T2 degrades ssRNAs in endosomes/lysosomes generating TLR7 ligands, and its catalytic activity (H122A and C188R but not H69A or E118V mutations impair both RNA degradation and TLR7 rescue) is required for this function.\",\n      \"method\": \"RNase T2-deficient macrophages, in vitro RNA degradation assays, RNase T2 mutagenesis, subcellular localization by confocal imaging\",\n      \"journal\": \"International Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro biochemical assays, site-directed mutagenesis, KO cells, localization imaging\",\n      \"pmids\": [\"34161582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"UNC93B1 variants (E92G and R336L) cause selective TLR7 hyperactivation: E92G causes UNC93B1 protein instability and reduced interaction with TLR7, leading to constitutive type I IFN signaling and early-onset SLE, establishing a direct mechanistic link between UNC93B1-TLR7 interaction and receptor activity.\",\n      \"method\": \"Patient variant identification, mouse macrophage functional assays with variant UNC93B1, protein stability measurements, co-immunoprecipitation of UNC93B1-TLR7 interaction\",\n      \"journal\": \"Science Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patient variants functionally validated, protein interaction measured, selective TLR subtype effects demonstrated\",\n      \"pmids\": [\"38207055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TLR7 gain-of-function interface mutations (F507S and L528I) at the TLR7 dimerization interface enhance TLR7 signaling, causing early-onset SLE and neurological disease; altered homo-dimerization is predicted to underlie enhanced signaling.\",\n      \"method\": \"Human genetic variant identification, structural modeling of dimerization interface, patient clinical phenotyping\",\n      \"journal\": \"Journal of Clinical Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — human variants identified with clinical phenotyping, but dimerization mechanism is predicted/modeled rather than directly measured\",\n      \"pmids\": [\"38324161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Deoxyguanosine (dG) triggers cytokine production (including type I IFNs, TNF, IL-6) through TLR7 and its adaptor MyD88 in an endosomal maturation-dependent manner, without requiring concurrent provision of RNA, demonstrating that dG is an RNA-independent TLR7 agonist.\",\n      \"method\": \"Murine bone marrow macrophages and pDCs, human PBMCs, TLR7-/- and MyD88-/- cells, endosomal maturation inhibitors, cytokine assays\",\n      \"journal\": \"European Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple KO models and cell types, mechanistic pharmacological controls, consistent results\",\n      \"pmids\": [\"31608988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The female-specific XIST lncRNA is a rich source of TLR7 ligands; XIST RNA stimulates IFN-alpha production by plasmacytoid DCs in a TLR7-dependent manner, and XIST deletion diminishes the ability of whole cellular RNA to activate TLR7.\",\n      \"method\": \"XIST deletion experiments, pDC stimulation assays with XIST RNA, TLR7-dependence validation, extracellular vesicle enrichment assays\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — XIST deletion functionally validated, TLR7 dependence confirmed in primary human pDCs, multiple orthogonal approaches\",\n      \"pmids\": [\"37733447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TLR7 signaling in T cells inhibits Th17 cell differentiation from naive T cells and IL-17 production via downregulation of STAT3 signaling through induction of SOCS3 and SOCS5, independently of dendritic cell involvement.\",\n      \"method\": \"In vitro T cell differentiation assays, STAT3 signaling analysis, SOCS3/5 measurement, in vivo EAE model with imiquimod treatment\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined molecular pathway (STAT3/SOCS3/5), DC-independent mechanism established, in vivo validation; single lab\",\n      \"pmids\": [\"28652396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Bruton's tyrosine kinase (Btk) mediates Ser-536 phosphorylation of p65 RelA and subsequent nuclear entry in TLR7/8-stimulated primary human macrophages; this mechanism is distinct from Btk's role in TLR4 signaling where it acts via p38 MAP kinase to stabilize TNF mRNA.\",\n      \"method\": \"Btk gene overexpression and siRNA knockdown, p65 phosphorylation assays, nuclear translocation assays in primary human macrophages\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined phosphorylation site and nuclear entry mechanism in primary human cells, but single lab study\",\n      \"pmids\": [\"29567473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Neuronal substance P (SP) acts on tumoral TACR1 receptors to drive death of a TACR1-high cancer cell population; ssRNAs released from dying cells activate neighboring cancer cell TLR7 to non-canonically activate a pro-metastatic gene expression program, promoting breast tumor invasion and metastasis.\",\n      \"method\": \"3D co-cultures, in vivo mouse mammary tumor models, genetic KO of TLR7, calcium imaging of neurons, TACR1 antagonist treatment\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vitro and in vivo models, genetic KO validation, defined signaling axis (SP→TACR1→cell death→ssRNA→TLR7→pro-metastatic program)\",\n      \"pmids\": [\"39112700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Purine nucleoside phosphorylase (PNP) regulates TLR7 signaling in B lymphocytes and macrophages by controlling levels of (deoxy)guanosine nucleoside ligands; PNP inactivation increases these ligands, promotes germinal center formation without exogenous antigen, and accelerates autoimmune disease.\",\n      \"method\": \"PNP inhibition/inactivation in B cells and macrophages, TLR7 agonist (deoxyguanosine) level measurement, germinal center formation assays, mouse autoimmunity model\",\n      \"journal\": \"Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link between metabolic enzyme and TLR7 ligand levels established, in vivo validation in autoimmune model\",\n      \"pmids\": [\"35653193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TLR7 drives accumulation of CD11c+ age-associated B cells (ABCs) and autoantibody production in autoimmune-prone mice; depletion of CD11c+ ABCs rapidly reduces autoantibodies, and Mer-/- mice lacking TLR7 fail to develop anti-chromatin IgG antibodies or ABCs.\",\n      \"method\": \"Genetic cross of Mer-/- with TLR7-/- mice, ABC depletion experiments, autoantibody quantification\",\n      \"journal\": \"Immunologic Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis and depletion experiments in vivo, defined cellular mechanism; single lab\",\n      \"pmids\": [\"22945807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TLR7 expressed on the cell surface of immune cells (not only endolysosomes) can be targeted by an anti-TLR7 antibody that internalizes with TLR7 into endolysosomes, inhibiting TLR7 responses in dendritic cells, macrophages, and B cells both in vitro and in vivo.\",\n      \"method\": \"Cell surface TLR7 detection by antibody staining, antibody internalization tracking, in vivo cytokine inhibition assays, therapeutic treatment of Unc93b1 D34A/D34A mice\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell types, in vivo validation, direct localization experiments with functional consequences\",\n      \"pmids\": [\"25648980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The X-linked gene Tlr7 regulates sex-specific type I IFN response to myelin; Tlr7 deletion dampens sex differences and protects against demyelination, while TLR7 inhibitor mitigates tau-induced motor impairment and demyelination in male mice.\",\n      \"method\": \"Single-nuclei transcriptomics, sex chromosome manipulation (FCG model), Tlr7 conditional KO mice, TLR7 inhibitor treatment in demyelination and AD mouse models\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and pharmacological inhibition, single-cell transcriptomics, multiple mouse models with defined sex-specific phenotype\",\n      \"pmids\": [\"39607927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"B cell-intrinsic TLR7 expression is a major driver of lupus in TLR9-deficient MRL/lpr mice; B cell-specific TLR7 deletion greatly improved disease in TLR9-deficient accelerated SLE, revealing a cis regulatory interaction between TLR9 (protective) and TLR7 (pathogenic) within the B cell compartment.\",\n      \"method\": \"TLR7-floxed allele crossed with CD11c-Cre or CD19-Cre, BM chimera strategy, on MRL/lpr and TLR9-deficient MRL/lpr backgrounds; disease scoring, proteinuria measurement\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with multiple genetic backgrounds, BM chimera validation, mechanistic epistasis established\",\n      \"pmids\": [\"37606042\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TLR7 is an endolysosomal pattern recognition receptor that senses single-stranded RNA and guanosine/deoxyguanosine nucleoside ligands (generated by cooperative action of RNase T2, PLD3, and PLD4) through two distinct binding pockets; upon ligand binding, it undergoes conformational change from open to closed state and signals via MyD88 to activate NF-κB and IRF pathways (the latter through the TASL adaptor on SLC15A4), with its surface expression, endosomal trafficking, and signaling threshold controlled by UNC93B1 (which recruits syntenin-1 to sort TLR7 into multivesicular bodies via phosphorylation-dependent mechanisms), BORC/Arl8b-mediated receptor turnover, and SHP2-dependent Tyr1024 dephosphorylation to regulate Golgi-to-endosome trafficking; biallelic TLR7 expression due to X chromosome inactivation escape in female immune cells enhances TLR7-driven responses and contributes to female sex bias in autoimmunity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TLR7 is an endolysosomal pattern recognition receptor that detects single-stranded RNA and guanosine/deoxyguanosine nucleoside ligands to initiate innate and adaptive immune responses, with a central role in antiviral defense, B cell activation, and the pathogenesis of systemic lupus erythematosus. TLR7 possesses two ligand-binding pockets: one engages guanosine-derived nucleosides (including 2',3'-cGMP generated cooperatively by RNase T2 and PLD3/PLD4 exonucleases), while the other binds RNA oligonucleotides; ligand engagement drives a conformational shift from an open to a closed dimer state, triggering MyD88-dependent NF-κB activation and IRF5 activation via the SLC15A4–TASL adaptor axis [PMID:14976261, PMID:33060576, PMID:38697119, PMID:32433612]. TLR7 trafficking and signaling thresholds are tightly controlled by UNC93B1, which recruits syntenin-1 to sort TLR7 into multivesicular bodies for signal termination and engages BORC/Arl8b for receptor turnover, while SHP2-mediated dephosphorylation of TLR7 Tyr1024 regulates Golgi-to-endosome transit; loss of these checkpoints—through UNC93B1 or TLR7 gain-of-function mutations—causes childhood-onset SLE [PMID:31546246, PMID:38207015, PMID:34936223, PMID:35477763]. TLR7 escapes X chromosome inactivation in female immune cells, producing biallelic expression that enhances TLR7-driven responses and contributes to the female sex bias in autoimmunity and neuroinflammatory demyelination [PMID:29374079, PMID:39607927].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of ssRNA as the natural TLR7 ligand and MyD88 as the obligate signaling adaptor established TLR7 as an endosomal nucleic acid sensor mediating antiviral type I IFN production.\",\n      \"evidence\": \"TLR7-/- and MyD88-/- mice failed to respond to ssRNA or influenza virus with cytokine production\",\n      \"pmids\": [\"14976261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise RNA sequence or structural motifs recognized by TLR7 not defined\", \"Endosomal delivery mechanism of natural ligands unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that 2'-O-methylation of RNA potently antagonizes TLR7 revealed a chemical basis for self/non-self RNA discrimination and provided the first tool compound for receptor inhibition.\",\n      \"evidence\": \"2'OMe-modified RNA inhibited TLR7-dependent IFN-α and IL-6 in human PBMCs, murine DCs, and in vivo\",\n      \"pmids\": [\"17579574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding mode of 2'OMe RNA to TLR7 not resolved\", \"Whether 2'OMe modification prevents TLR7 binding or signaling conformational change unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that LL37 shuttles self-RNA into endosomes to activate TLR7 explained how endogenous RNA—normally excluded from endosomal compartments—can breach tolerance and drive autoimmune IFN-α production in psoriasis.\",\n      \"evidence\": \"Co-culture/binding assays, TLR7-deficient cells, and in vivo psoriatic skin analysis\",\n      \"pmids\": [\"19703986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other cationic carriers substitute for LL37 in different autoimmune contexts not tested\", \"Relative contribution of TLR7 vs TLR8 in human pDC activation by LL37-RNA complexes unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic epistasis between TLR7 and TLR9 in lupus-prone mice established that TLR9 restrains TLR7-driven autoimmunity, revealing an unexpected cross-regulatory hierarchy rather than simple redundancy.\",\n      \"evidence\": \"Tlr7-/-, Tlr9-/-, double-KO, and Myd88-/- MRL/lpr mice with autoantibody profiling and disease scoring\",\n      \"pmids\": [\"20089701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which TLR9 suppresses TLR7 signaling not identified\", \"Whether the TLR9-TLR7 hierarchy operates in human lupus unconfirmed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"A genome-wide RNAi screen cataloged ~190 cofactors for TLR7/9 signaling, revealing dependence on ubiquitin ligases, sphingolipid metabolism, and chromatin modification, greatly expanding the known signaling network.\",\n      \"evidence\": \"Genome-wide siRNA screen with cross-profiling against multiple immunoreceptors; HRS validated for TLR9 endolysosomal targeting\",\n      \"pmids\": [\"22423970\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most TLR7-specific cofactors not individually validated\", \"Mechanistic roles of sphingolipid and chromatin regulators in TLR7 signaling undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Proteome-wide phosphoproteomics and transcriptomics demonstrated that TLR7 can signal in two distinct modes—nucleoside versus oligoribonucleotide—triggering different downstream phosphorylation and transcriptional programs.\",\n      \"evidence\": \"Phosphoproteomics and transcriptomics in primary human monocyte-derived DCs with multiple ligand classes, plus ectodomain mapping\",\n      \"pmids\": [\"24813206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for dual-mode signaling not yet resolved at this time\", \"Relative physiological contribution of each mode during infection unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of guanosine and deoxyguanosine as direct endogenous TLR7 ligands, with ITC-measured binding and cooperative enhancement by oligoribonucleotides, established TLR7 as a dual-ligand receptor with two binding sites.\",\n      \"evidence\": \"ITC binding, cytokine assays in mouse/human immune cells, Unc93b1 D34A macrophages\",\n      \"pmids\": [\"26489884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural identity of the two pockets not yet resolved at atomic level\", \"Physiological source of free guanosine in endosomes unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that TREML4 is essential for TLR7-induced type I IFN through p38-STAT1 phosphorylation and MyD88 recruitment identified a cell-surface co-receptor that sets TLR7 signaling intensity.\",\n      \"evidence\": \"Genome-scale shRNA screen validated by Treml4-/- mice, phosphorylation and co-IP assays\",\n      \"pmids\": [\"25848864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between TREML4 and TLR7 not demonstrated\", \"Whether TREML4 participates in TLR7 endosomal sorting unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstration that B cell autophagy is required to deliver RNA ligands to endosomal TLR7, and that its ablation eliminates lupus in TLR7-transgenic mice, defined autophagy as a critical upstream ligand-delivery pathway.\",\n      \"evidence\": \"B cell-specific Atg5 KO crossed to TLR7-transgenic mice; autoantibodies and inflammation abolished\",\n      \"pmids\": [\"26120731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether autophagy delivers self-RNA, viral RNA, or both to TLR7 not distinguished\", \"Specific autophagic cargo targeting mechanism for TLR7 ligand delivery undefined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstration that TLR7 escapes X chromosome inactivation in female immune cells, yielding biallelic expression and enhanced TLR7 responses, provided a molecular explanation for the female sex bias in SLE.\",\n      \"evidence\": \"Single-cell allelic expression, flow cytometry protein quantification, B cell functional assays in women vs men and Klinefelter males\",\n      \"pmids\": [\"29374079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Epigenetic mechanism governing TLR7 XCI escape not defined\", \"Whether biallelic expression is uniform across all immune cell subsets not fully mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Elucidation of the UNC93B1–syntenin-1 axis for TLR7-selective signal termination revealed a phosphorylation-dependent sorting mechanism that shuttles TLR7 into multivesicular body intralumenal vesicles, explaining how TLR7 (but not TLR9) is restrained.\",\n      \"evidence\": \"UNC93B1 mutagenesis, syntenin-1 binding, exosome fractionation, in vivo autoimmunity rescue\",\n      \"pmids\": [\"31546246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for UNC93B1 phosphorylation not identified\", \"Whether exosomal release of TLR7 has intercellular signaling consequences unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Functional demonstration that deoxyguanosine alone—without RNA—activates TLR7 in an endosomal maturation-dependent manner clarified that the nucleoside pocket can independently initiate signaling.\",\n      \"evidence\": \"TLR7-/- and MyD88-/- murine cells and human PBMCs treated with dG, with endosomal maturation inhibitors\",\n      \"pmids\": [\"31608988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNA-independent dG activation occurs physiologically in vivo not established\", \"Relative potency of dG vs ssRNA+G synergy in natural infection undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of TLR7-driven differentiation of monocytes into inflammatory hemophagocytes via IRF5 revealed a previously unknown pathogenic cellular output of excessive TLR7 signaling causing cytopenias.\",\n      \"evidence\": \"TLR7-overexpressing mice, lineage tracing, IRF5-KO and MyD88-KO mice, malarial anemia model\",\n      \"pmids\": [\"30630901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional program downstream of IRF5 driving hemophagocyte fate not characterized\", \"Relevance to human hemophagocytic syndromes not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of TASL as an endolysosomal adaptor bridging SLC15A4 to IRF5 activation defined a dedicated signaling branch for TLR7-to-IRF pathway signaling that is independent of NF-κB and MAPK.\",\n      \"evidence\": \"TASL and SLC15A4 knockout, TASL pLxIS motif mutagenesis, co-IP, cytokine assays in human immune cells\",\n      \"pmids\": [\"32433612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TASL is itself activated upon TLR7 engagement not resolved\", \"Whether TASL contributes differentially to TLR7 vs TLR9 signaling outcomes unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Structural resolution of TLR7 open-to-closed conformational equilibrium by crystallography and cryo-EM explained the activation mechanism and showed that antagonists lock TLR7 in the open (inactive) state.\",\n      \"evidence\": \"X-ray crystallography, cryo-EM, small-molecule antagonist testing in vivo\",\n      \"pmids\": [\"33060576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length TLR7–MyD88 signalosome structure not resolved\", \"How dual ligand binding to the two pockets cooperatively triggers closing not atomically detailed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstration that RNase T2 catalytic activity is required to generate TLR7 ligands from ssRNA in endolysosomes placed this nuclease as an obligate upstream processing step.\",\n      \"evidence\": \"RNase T2-deficient macrophages, RNA degradation assays, catalytic-site mutagenesis\",\n      \"pmids\": [\"34161582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNase T2 products are sufficient without further processing by exonucleases not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of SHP2-mediated Tyr1024 dephosphorylation as a mechanism controlling TLR7 Golgi-to-endosome trafficking revealed a phosphorylation-based checkpoint for receptor delivery and inflammatory signaling.\",\n      \"evidence\": \"Conditional SHP2 KO mice, TLR7 Y1024 knock-in, in vivo psoriasis model\",\n      \"pmids\": [\"34936223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase that phosphorylates TLR7 Tyr1024 not identified\", \"Whether this checkpoint operates in all TLR7-expressing cell types not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery of a TLR7 gain-of-function variant (Y264H) that selectively enhances guanosine sensing and causes monogenic lupus—rescued by MyD88 deletion—provided definitive human genetic proof that TLR7 hyperactivation is sufficient to drive systemic autoimmunity.\",\n      \"evidence\": \"Patient mutation, knock-in mice, epistasis with MyD88-KO, B cell functional assays\",\n      \"pmids\": [\"35477763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Y264H selectivity toward guanosine vs RNA ligands not atomically resolved\", \"Frequency of TLR7 gain-of-function alleles across lupus cohorts not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that purine nucleoside phosphorylase (PNP) controls TLR7 activation by catabolizing guanosine/deoxyguanosine ligands linked metabolic purine salvage to TLR7 signaling threshold regulation.\",\n      \"evidence\": \"PNP inhibition in B cells/macrophages, nucleoside quantification, germinal center assays, autoimmune mouse model\",\n      \"pmids\": [\"35653193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of PNP-regulated dG vs RNA-derived ligands in disease not quantified\", \"Whether PNP deficiency in humans activates TLR7 not directly shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cell-type-specific deletion established B cell-intrinsic TLR7 as the dominant driver of accelerated lupus in TLR9-deficient mice, confirming that the TLR9–TLR7 cross-regulatory axis operates within the B cell compartment.\",\n      \"evidence\": \"TLR7-floxed with CD19-Cre on MRL/lpr and TLR9-/- backgrounds, BM chimeras\",\n      \"pmids\": [\"37606042\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether dendritic cell TLR7 contributes independently to the TLR9-deficient phenotype not excluded\", \"Intracellular mechanism of TLR9-mediated TLR7 restraint still undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Biochemical reconstitution of the RNase T2–PLD3/PLD4 cooperative pathway demonstrated how endosomal nucleases generate both 2',3'-cGMP (pocket 1 ligand) and RNA fragments (pocket 2 ligand) for TLR7, solving the ligand-generation pathway.\",\n      \"evidence\": \"In vitro reconstitution, structural studies of PLD homodimers, mutagenesis of disease-associated PLD variants, cell-based validation\",\n      \"pmids\": [\"38697119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional endonucleases contribute in specific cell types not tested\", \"Kinetics of ligand generation relative to TLR7 dwell time in endolysosomes unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of the BORC–Arl8b axis interacting with UNC93B1 to control TLR7 receptor turnover, and validation via a childhood-onset SLE UNC93B1 mutation, defined a second UNC93B1-dependent checkpoint (turnover vs signal termination) for TLR7 dosage.\",\n      \"evidence\": \"UNC93B1–Arl8b direct interaction, patient mutation analysis, receptor turnover and endosomal fractionation\",\n      \"pmids\": [\"38207015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How BORC/Arl8b directs TLR7 to lysosomes for degradation at the molecular level not detailed\", \"Relationship between syntenin-1 MVB sorting and BORC-mediated turnover not integrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"TLR7 was shown to mediate a non-canonical cancer cell-intrinsic signaling program in which ssRNA released from dying tumor cells activates TLR7 on neighboring cancer cells to promote invasion and metastasis, expanding TLR7 function beyond immune cells.\",\n      \"evidence\": \"3D co-cultures, in vivo mammary tumor models, TLR7 genetic KO, defined signaling axis (SP→TACR1→death→ssRNA→TLR7)\",\n      \"pmids\": [\"39112700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TLR7 pro-metastatic signaling uses canonical MyD88 or alternative adaptors not specified\", \"Generalizability beyond breast cancer models not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstration that X-linked Tlr7 regulates sex-specific type I IFN responses to myelin and that its deletion or pharmacological inhibition mitigates demyelination extended the sex-biased TLR7 paradigm to neuroinflammatory disease.\",\n      \"evidence\": \"Single-nuclei transcriptomics, FCG sex-chromosome model, Tlr7 conditional KO, TLR7 inhibitor in demyelination and AD mouse models\",\n      \"pmids\": [\"39607927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TLR7 acts in resident microglia, infiltrating monocytes, or both not fully dissected\", \"Human translation of TLR7 inhibition for demyelinating disease not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full structural basis for cooperative dual-pocket ligand engagement triggering TLR7 dimer closure, the identity of kinases regulating UNC93B1 and TLR7 phosphorylation, and the molecular mechanism of TLR9-mediated TLR7 restraint within B cells remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Full-length TLR7–MyD88 signalosome structure not available\", \"Kinases for UNC93B1 S550 phosphorylation and TLR7 Tyr1024 phosphorylation unknown\", \"Molecular mechanism of TLR9 cross-regulation of TLR7 undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 8, 9, 26]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 8, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 7, 11, 13, 33]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [7, 10, 11]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [33]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [7, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 6, 12, 15, 17, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 6, 9, 13, 18, 29]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 25, 30, 35]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"MYD88\",\n      \"UNC93B1\",\n      \"TASL\",\n      \"SLC15A4\",\n      \"TREML4\",\n      \"PTPN11\",\n      \"ARL8B\",\n      \"IRF5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}