{"gene":"TGFB1","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1998,"finding":"TGF-β signals through cell-surface type I and type II serine/threonine kinase receptors; ligand binding recruits and transphosphorylates the type I receptor, which then phosphorylates SMAD2/3 on C-terminal SSXS motifs, inducing their association with SMAD4 and nuclear translocation to activate target gene transcription.","method":"Biochemical pathway reconstitution, phosphorylation assays, receptor mutagenesis, nuclear translocation studies","journal":"Annual review of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted mechanistic pathway with multiple orthogonal methods, independently replicated across many labs over years","pmids":["9759503","9525694","10879283"],"is_preprint":false},{"year":1992,"finding":"TGF-β binds to cell surface receptors of 55 kDa (type I) and 70 kDa (type II); inhibitors of serine/threonine kinase activity block transcriptional and growth-inhibitory responses to TGF-β; the proteoglycan betaglycan binds TGF-β via its core protein and may regulate TGF-β interaction with signaling receptors.","method":"Receptor purification and binding assays, kinase inhibitor studies, molecular cloning, biochemical characterization","journal":"Molecular reproduction and development","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical receptor identification with functional validation and mutagenesis, replicated across labs","pmids":["1322148"],"is_preprint":false},{"year":2000,"finding":"TGF-β activates Ras, ERKs, and SAPKs in epithelial cells; the MEK/ERK pathway is required for TGF-β autoinduction via AP-1 (JunD/Fra-2) binding to the TGFβ1 promoter; Smad3 is required for autoinduction independently of Smad4; ERK-mediated phosphorylation of the Smad1 linker region controls Smad1-Smad4 interaction and nuclear accumulation.","method":"Dominant-negative constructs (RasN17, DN-MKK4, DN-Smad3), MEK inhibitor (PD98059), reporter assays, supershift assays, promoter activity assays","journal":"Cytokine & growth factor reviews","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with dominant-negatives and pharmacological inhibition, multiple orthogonal assays, single lab","pmids":["10708950"],"is_preprint":false},{"year":2000,"finding":"Receptor-regulated SMADs (SMAD2/3) are anchored to the cell membrane by SARA (Smad anchor for receptor activation); upon TGF-β stimulation they are phosphorylated by the type I receptor kinase and form oligomeric complexes with SMAD4 that translocate to the nucleus; inhibitory SMADs (SMAD6/7) block receptor-mediated R-SMAD phosphorylation and their expression is induced by TGF-β, forming a negative autofeedback loop.","method":"Co-immunoprecipitation, phosphorylation assays, subcellular fractionation, reporter assays, gene targeting","journal":"Advances in immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, functional phosphorylation assays, and genetic models, replicated across multiple labs","pmids":["10879283"],"is_preprint":false},{"year":2011,"finding":"TGF-β signals via the canonical ALK5/Smad3 pathway to induce myofibroblast transdifferentiation and matrix preservation; Smad-independent pathways (MAPK, JNK, p38) modulate Smad activation and can directly transduce fibrogenic signals; the downstream effector connective tissue growth factor (CTGF) mediates profibrotic actions of TGF-β.","method":"In vitro fibroblast transdifferentiation assays, kinase inhibition, loss-of-function studies in experimental models","journal":"Growth factors (Chur, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple experimental models with pathway-specific inhibitors, replicated across labs","pmids":["21740331"],"is_preprint":false},{"year":2011,"finding":"SMAD2 and SMAD3 are subject to post-translational modifications including phosphorylation (C-terminal receptor-mediated and linker region by MAPKs), ubiquitination, sumoylation, acetylation, and poly(ADP)-ribosylation that regulate their activity and stability.","method":"Biochemical modification assays, mutagenesis, proteasomal degradation studies","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple PTMs established by direct biochemical assays, reviewed from multiple lab studies","pmids":["21643690"],"is_preprint":false},{"year":2012,"finding":"USP11 deubiquitylase interacts with SMAD7 and deubiquitylates the type I TGF-β receptor (ALK5), thereby stabilizing it and enhancing TGF-β-induced SMAD2/3 phosphorylation and transcriptional responses; RNAi depletion of USP11 inhibits SMAD2/3 phosphorylation, and USP11 deubiquitylase activity is required for this effect.","method":"Co-immunoprecipitation, ubiquitylation assays, RNAi knockdown, SMAD2/3 phosphorylation assays, reporter assays","journal":"Open biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional ubiquitylation assays and deubiquitylase activity requirement, single lab","pmids":["22773947"],"is_preprint":false},{"year":2010,"finding":"TGF-β is produced as an inactive (latent) complex that must be activated to bind its receptor; members of the integrin receptor family (particularly αV integrins) play crucial roles in activating latent TGFβ, controlling its availability to signal.","method":"Cell-based TGF-β activation assays, integrin loss-of-function studies, biochemical activation assays","journal":"Trends in biochemical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cell-based activation assays with integrin mutants, reviewed from multiple studies","pmids":["20870411"],"is_preprint":false},{"year":2022,"finding":"Latent TGFβ binding proteins (LTBPs) are cross-linked by transglutaminase-2 (TG2) to fibrillin in the extracellular matrix; TG2 cross-links LTBP-1 and LTBP-3 to fibrillin, and the resulting fibrillin-LTBP1 complex shows a perpendicular arrangement; cross-linking does not alter integrin αVβ6 interaction with latent TGFβ but increases TGFβ activation in cell-based assays, likely by directing latent complexes to the cell surface.","method":"In vitro cross-linking assays, structural analysis of fibrillin-LTBP1 complex, cell-based TGFβ activation assays, heparan sulphate competition experiments","journal":"Matrix biology : journal of the International Society for Matrix Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical cross-linking, structural characterization, and cell-based functional assays, single lab with multiple orthogonal methods","pmids":["35122964"],"is_preprint":false},{"year":2022,"finding":"ADAMTS6 metalloprotease directly cleaves LTBP1 and LTBP3, components of the large latent TGFβ complex, and binds these complexes; ADAMTS6 expression also increases cellular mechanotension, leading to YAP/TAZ nuclear translocation; both mechanisms contribute to TGFβ activation from large latent complexes, and catalytic activity of ADAMTS6 is required for effective TGFβ activation.","method":"Cell-based TGFβ activation assays, proteolytic cleavage assays, mechanotension measurements, YAP/TAZ localization assays, catalytic mutant analysis","journal":"Matrix biology : journal of the International Society for Matrix Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cleavage assays, mechanotension measurements, and functional TGFβ activation assays with catalytic mutants, single lab","pmids":["36368447"],"is_preprint":false},{"year":2019,"finding":"TGF-β transcriptionally induces NUAK1 and NUAK2 kinases via SMAD2/3/4 and MAPK pathways; a SMAD-responsive enhancer within the first intron of NUAK2 recruits SMAD proteins; NUAK2 forms protein complexes with SMAD3 and the TGFβ type I receptor; NUAK1 negatively and NUAK2 positively regulate TGFβ-induced cytostasis, mesenchymal differentiation, and myofibroblast contractility.","method":"Chromatin immunoprecipitation, reporter assays, co-immunoprecipitation, siRNA knockdown, cell functional assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus genomic mapping and loss-of-function phenotypes, multiple orthogonal methods, single lab","pmids":["30622137"],"is_preprint":false},{"year":2018,"finding":"TNFRSF19 binds the kinase domain of TGFβ type I receptor (TβRI) in the cytoplasm, blocking association of SMAD2/3 with TβRI and subsequent phosphorylation; ectopic TNFRSF19 expression confers resistance to TGFβ-induced cell-cycle arrest; TNFRSF19 knockout unleashes SMAD2/3 phosphorylation and TGFβ target gene transcription.","method":"Co-immunoprecipitation, kinase domain interaction mapping, SMAD2/3 phosphorylation assays, CRISPR knockout, proliferation assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-IP with domain mapping, SMAD phosphorylation and gene expression readouts, CRISPR KO, single lab","pmids":["29735548"],"is_preprint":false},{"year":2021,"finding":"AMBRA1 serves as the substrate receptor in the CUL4-RING ubiquitin ligase (CRL4) complex and mediates nonproteolytic K63-linked polyubiquitylation of SMAD4, enhancing its transcriptional activity; AMBRA1 potentiates TGFβ signaling and promotes TGFβ-induced EMT, migration, and invasion in breast cancer cells and metastasis in mouse models.","method":"Co-immunoprecipitation, ubiquitylation assays, SMAD4 transcriptional reporter assays, siRNA knockdown, mouse tumor models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ubiquitylation assays, co-IP, reporter assays with functional cancer phenotypes in vivo, single lab","pmids":["34362797"],"is_preprint":false},{"year":2002,"finding":"TIEG (TGF-β inducible early gene), a Krüppel-like transcription factor, enhances TGFβ/SMAD-dependent transcription by binding and repressing the Smad7 gene promoter; TIEG overexpression enhances TGFβ-induced Smad2 phosphorylation and induction of p21 and PAI-1; this effect requires Smad4 and is blocked by Smad7 overexpression.","method":"Reporter assays (SBE-luciferase), endogenous gene expression assays, Smad2 phosphorylation assays, promoter binding assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays (reporter, endogenous genes, phosphorylation) with epistasis, single lab","pmids":["12173049"],"is_preprint":false},{"year":2023,"finding":"TGFB1 is necessary and sufficient to induce a fetal-like/regenerative transcriptional state in intestinal organoids; mechanistically, TGFB1 activates pro-regenerative factors YAP/TEAD and SOX9 in the epithelium; macrophage-derived TGFB1 surge at 2 days post-irradiation mediates intestinal regeneration, and genetic disruption of TGFB signaling or macrophage depletion impairs the regenerative response.","method":"Mouse genetics, organoid culture, macrophage depletion, RNA sequencing, TGFB1 treatment, in vivo engraftment assays","journal":"Cell stem cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function, organoid reconstitution, and mechanistic pathway identification (YAP/TEAD, SOX9), single study with multiple orthogonal methods","pmids":["37865088"],"is_preprint":false},{"year":2009,"finding":"SMAD7 recruits E3 ubiquitin ligases (Smurf1/2) to TGFβ receptors, targeting them for ubiquitin-mediated proteasomal degradation, thereby negatively regulating TGFβ receptor stability and duration of signaling.","method":"Co-immunoprecipitation, ubiquitylation assays, receptor degradation assays, knockdown studies","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ubiquitylation assays, reviewed from multiple lab studies","pmids":["19030025"],"is_preprint":false},{"year":2018,"finding":"TGFβ1 stimulation of monocytes induces expression of integrin subunits ITGA5 and ITGAV (but lowers ITGB8), establishing a feedback regulatory loop; in SSc patients, reduced expression of TGFβ-activating integrins (ITGA5, ITGAV, ITGB3, ITGB5, ITGB8) on monocytes correlates with decreased TGFβ activation in serum despite normal total TGFβ levels.","method":"Luciferase TGFβ reporter assays on primary fibroblasts, rhTGFβ1 stimulation, TGFBR1 inhibitor (SB-505124), qPCR of integrin expression, acid activation of serum","journal":"Arthritis research & therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-method gene expression modulation with pharmacological inhibitor, limited mechanistic depth, single lab","pmids":["32143707"],"is_preprint":false},{"year":2015,"finding":"Intermittent compressive mechanical force applied to human periodontal ligament (hPDL) fibroblasts promotes intracellular accumulation (not secretion) of TGF-β1, which then drives expression of SOST and POSTN; blocking TGF-β1 with a neutralizing antibody or TGFβ receptor inhibitor (SB431542) attenuates force-induced SOST and POSTN expression.","method":"Compressive force loading, cycloheximide treatment, TGFβR1 inhibitor (SB431542), neutralizing antibody, ELISA, Western blot, RT-PCR","journal":"Journal of dental research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pharmacological and antibody inhibition studies in a single cell type, single lab, limited mechanistic resolution of the pathway","pmids":["25870205"],"is_preprint":false},{"year":2018,"finding":"TGF-β1 and hypoxia enhance glucose metabolism and lactate production in tendon cells via HIF1A signaling, activating a Warburg-type glycolytic reprogramming; this was shown both in vivo (murine TGF-β1 injection model) and in vitro in tendon explants.","method":"In vivo murine injection, in vitro tendon explant culture, immunohistochemistry, gene expression profiling","journal":"Connective tissue research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — correlative expression with limited direct mechanistic dissection of the TGFβ-HIF1A axis, single lab","pmids":["29447016"],"is_preprint":false}],"current_model":"TGFB1 signals as a secreted cytokine (produced in inactive latent complexes that are activated extracellularly by integrins, proteases such as ADAMTS6, and matrix cross-linking by transglutaminase-2/fibrillin) by binding cell-surface type II serine/threonine kinase receptors that recruit and transphosphorylate type I receptors (ALK5), which in turn phosphorylate SMAD2/3 on C-terminal SSXS motifs; phosphorylated SMAD2/3 complex with SMAD4 and translocate to the nucleus to regulate target gene transcription in cooperation with context-specific DNA-binding partners and co-regulators; signaling duration is controlled by SMAD7-mediated receptor ubiquitylation/degradation (counteracted by the deubiquitylase USP11), nonproteolytic polyubiquitylation of SMAD4 by CRL4-AMBRA1 enhancing its transcriptional output, MAPK-mediated phosphorylation of SMAD linker regions, and feedback target genes such as TIEG; in parallel, TGFB1 activates non-SMAD pathways including Ras/MAPK/ERK and SAPK that contribute to autoinduction and crosstalk with SMAD signaling."},"narrative":{"mechanistic_narrative":"TGFB1 is a secreted cytokine that controls cytostasis, mesenchymal/myofibroblast differentiation, extracellular matrix production, and tissue regeneration by signaling through a cell-surface serine/threonine kinase receptor system [PMID:9759503, PMID:9525694, PMID:10879283, PMID:1322148]. It is produced as an inactive latent complex whose bioavailability is set extracellularly: latent TGFB1-binding proteins (LTBP1/LTBP3) are cross-linked to fibrillin by transglutaminase-2 to position latent complexes at the cell surface [PMID:35122964], αV integrins activate the latent ligand [PMID:20870411], and the metalloprotease ADAMTS6 cleaves LTBP1/LTBP3 while raising mechanotension to drive YAP/TAZ-dependent activation [PMID:36368447]. Once activated, ligand binding to the type II receptor recruits and transphosphorylates the type I receptor (ALK5), which phosphorylates SMAD2/3 on C-terminal SSXS motifs; SARA anchors R-SMADs at the membrane for this step, and phosphorylated SMAD2/3 then complex with SMAD4 and translocate to the nucleus to direct target gene transcription [PMID:9759503, PMID:9525694, PMID:10879283]. Signal strength and duration are tuned by an interlocking regulatory network: inhibitory SMAD7 recruits Smurf1/2 to ubiquitylate and degrade the receptor [PMID:10879283, PMID:19030025], a step opposed by the deubiquitylase USP11, which stabilizes ALK5 and amplifies SMAD2/3 phosphorylation [PMID:22773947]; the CRL4 substrate receptor AMBRA1 adds nonproteolytic K63-linked ubiquitin to SMAD4 to enhance its transcriptional output [PMID:34362797]; and intracellular antagonists such as TNFRSF19 block SMAD2/3 access to the receptor kinase domain [PMID:29735548]. In parallel, TGFB1 engages non-SMAD effectors—Ras/ERK and SAPK/JNK/p38—that feed back on SMAD activity, mediate autoinduction through AP-1 at the TGFB1 promoter, and transduce fibrogenic signals together with effectors such as CTGF [PMID:10708950, PMID:21740331]. Transcriptional feedback loops, including the Krüppel-like factor TIEG (which represses SMAD7) and induction of NUAK1/NUAK2 kinases that bind SMAD3 and ALK5, further shape responses such as cytostasis and myofibroblast contractility [PMID:12173049, PMID:30622137]. Functionally, macrophage-derived TGFB1 drives a fetal-like regenerative epithelial state via YAP/TEAD and SOX9 during intestinal repair [PMID:37865088].","teleology":[{"year":1992,"claim":"Established that TGFB1 acts through discrete cell-surface receptors with kinase activity, defining the receptor-based logic of the pathway.","evidence":"Receptor purification/binding assays, kinase inhibitor studies, and cloning identifying ~55 kDa type I and ~70 kDa type II receptors and the accessory proteoglycan betaglycan","pmids":["1322148"],"confidence":"High","gaps":["Did not resolve how receptor kinases transmit signal to intracellular effectors","Role of betaglycan in receptor presentation only partially defined"]},{"year":1998,"claim":"Resolved the core transduction mechanism, showing how receptor activation is relayed to the nucleus via SMAD phosphorylation and complex formation.","evidence":"Pathway reconstitution, phosphorylation assays, receptor mutagenesis, and nuclear translocation studies defining type II→type I transphosphorylation and SMAD2/3 SSXS phosphorylation feeding SMAD4 complex formation","pmids":["9759503","9525694","10879283"],"confidence":"High","gaps":["Context-specific DNA-binding partners not enumerated","Did not address feedback control of signal duration"]},{"year":2000,"claim":"Defined membrane anchoring and negative feedback of R-SMADs, explaining how signaling is spatially organized and self-limited.","evidence":"Co-IP, phosphorylation assays, subcellular fractionation, and gene targeting showing SARA-mediated R-SMAD anchoring and inhibitory SMAD6/7 induction as an autofeedback loop","pmids":["10879283"],"confidence":"High","gaps":["Molecular mechanism by which inhibitory SMADs block phosphorylation not fully detailed here"]},{"year":2000,"claim":"Showed that TGFB1 also activates non-SMAD kinase cascades that feed back on SMAD activity and drive ligand autoinduction.","evidence":"Dominant-negative constructs, MEK inhibition, reporter and supershift assays linking Ras/ERK/SAPK, AP-1 (JunD/Fra-2) promoter binding, and Smad linker phosphorylation","pmids":["10708950"],"confidence":"Medium","gaps":["Generalization beyond epithelial cells not established","Quantitative contribution of each kinase arm unclear"]},{"year":2002,"claim":"Identified a transcriptional feedback factor that amplifies SMAD signaling by repressing the inhibitory SMAD7 gene.","evidence":"SBE-luciferase reporters, endogenous p21/PAI-1 induction, Smad2 phosphorylation, and promoter-binding assays with TIEG, dependent on Smad4 and blocked by Smad7","pmids":["12173049"],"confidence":"Medium","gaps":["Direct DNA-binding kinetics of TIEG at the Smad7 promoter not resolved","In vivo relevance not tested"]},{"year":2009,"claim":"Mechanistically explained receptor turnover as a brake on signaling through SMAD7-directed ubiquitylation.","evidence":"Co-IP, ubiquitylation, and receptor degradation assays showing SMAD7 recruits Smurf1/2 to degrade TGFβ receptors","pmids":["19030025"],"confidence":"Medium","gaps":["Counter-regulatory deubiquitylation not addressed in this work"]},{"year":2010,"claim":"Placed latent ligand activation by integrins at the center of controlling TGFB1 availability.","evidence":"Cell-based activation assays with integrin loss-of-function, particularly αV integrins, on latent TGFβ complexes","pmids":["20870411"],"confidence":"Medium","gaps":["Force- versus protease-dependent activation modes not disentangled here","Tissue-specific integrin usage unresolved"]},{"year":2011,"claim":"Catalogued the breadth of post-translational control over SMAD2/3 activity and stability.","evidence":"Biochemical modification assays and mutagenesis documenting phosphorylation, ubiquitination, sumoylation, acetylation, and poly(ADP)-ribosylation","pmids":["21643690"],"confidence":"Medium","gaps":["Functional hierarchy among the PTMs not established","Enzymes for several modifications not identified"]},{"year":2011,"claim":"Connected canonical and non-SMAD arms to a defined fibrogenic output via myofibroblast differentiation and CTGF.","evidence":"Fibroblast transdifferentiation assays with pathway-specific kinase inhibition and loss-of-function in experimental fibrosis models","pmids":["21740331"],"confidence":"Medium","gaps":["Relative dependence on ALK5/Smad3 versus MAPK/JNK/p38 context-dependent and not quantified"]},{"year":2012,"claim":"Identified the deubiquitylase that opposes SMAD7-driven receptor degradation, completing a ubiquitin-based rheostat on signal duration.","evidence":"Co-IP, ubiquitylation and RNAi assays showing USP11 binds SMAD7, deubiquitylates ALK5, and its catalytic activity is required to sustain SMAD2/3 phosphorylation","pmids":["22773947"],"confidence":"Medium","gaps":["Single lab; in vivo physiological role not established","Regulation of USP11 recruitment unknown"]},{"year":2018,"claim":"Revealed an intracellular receptor antagonist that gates SMAD recruitment and sets TGFB1 cytostatic sensitivity.","evidence":"Co-IP with kinase-domain mapping, SMAD2/3 phosphorylation readouts, CRISPR knockout, and proliferation assays for TNFRSF19 binding to TβRI","pmids":["29735548"],"confidence":"Medium","gaps":["Physiological contexts where TNFRSF19 limits signaling not defined","Single lab"]},{"year":2019,"claim":"Defined a kinase feedback module wherein TGFB1 induces NUAK1/2 that bind the signaling machinery and bidirectionally tune responses.","evidence":"ChIP, reporter assays, co-IP, and siRNA showing SMAD-responsive NUAK2 enhancer, NUAK2–SMAD3/TβRI complexes, and opposing NUAK1/NUAK2 effects on cytostasis and myofibroblast contractility","pmids":["30622137"],"confidence":"Medium","gaps":["Substrates of NUAK kinases within the pathway not identified","Single lab"]},{"year":2021,"claim":"Showed nonproteolytic ubiquitylation of SMAD4 as a positive amplifier of transcriptional output with pro-metastatic consequences.","evidence":"Co-IP, K63 ubiquitylation assays, SMAD4 reporters, siRNA, and mouse tumor models for CRL4-AMBRA1","pmids":["34362797"],"confidence":"Medium","gaps":["Whether this regulation operates outside breast cancer unknown","Single lab"]},{"year":2022,"claim":"Mechanistically dissected extracellular latent-complex activation through matrix cross-linking and proteolysis.","evidence":"In vitro cross-linking and structural analysis of fibrillin–LTBP1 with cell-based activation (TG2) and direct LTBP1/3 cleavage plus mechanotension/YAP-TAZ assays with catalytic mutants (ADAMTS6)","pmids":["35122964","36368447"],"confidence":"Medium","gaps":["Interplay between cross-linking, proteolysis, and integrin activation not integrated","Single-lab studies"]},{"year":2023,"claim":"Demonstrated a physiological regenerative function in which macrophage-derived TGFB1 reprograms epithelium to a fetal-like state.","evidence":"Mouse genetics, organoid reconstitution, macrophage depletion, RNA-seq, and engraftment assays linking TGFB1 to YAP/TEAD and SOX9 in intestinal regeneration","pmids":["37865088"],"confidence":"Medium","gaps":["Whether the same circuit operates in other regenerating tissues unknown","Direct versus indirect epithelial targets not fully resolved"]},{"year":null,"claim":"How the multiple latent-activation modes (integrins, proteases, matrix cross-linking, mechanical force) are integrated with intracellular feedback to produce context-specific, quantitatively defined outputs remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking activation mode to downstream transcriptional program","Tissue-specific cofactors that direct cytostatic versus fibrogenic versus regenerative outcomes not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,4,14]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,8]},{"term_id":"GO:0031012","term_label":"extracellular matrix","supporting_discovery_ids":[8,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-1474244","term_label":"Extracellular matrix organization","supporting_discovery_ids":[8,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[14]}],"complexes":[],"partners":["SMAD2","SMAD3","SMAD4","SMAD7","ALK5/TGFBR1","ITGAV","LTBP1","TNFRSF19"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P01137","full_name":"Transforming growth factor beta-1 proprotein","aliases":[],"length_aa":390,"mass_kda":44.3,"function":"Transforming growth factor beta-1 proprotein: Precursor of the Latency-associated peptide (LAP) and Transforming growth factor beta-1 (TGF-beta-1) chains, which constitute the regulatory and active subunit of TGF-beta-1, respectively Required to maintain the Transforming growth factor beta-1 (TGF-beta-1) chain in a latent state during storage in extracellular matrix (PubMed:28117447). Associates non-covalently with TGF-beta-1 and regulates its activation via interaction with 'milieu molecules', such as LTBP1, LRRC32/GARP and LRRC33/NRROS, that control activation of TGF-beta-1 (PubMed:19651619, PubMed:19750484, PubMed:2022183, PubMed:22278742, PubMed:8617200, PubMed:8939931). Interaction with LRRC33/NRROS regulates activation of TGF-beta-1 in macrophages and microglia (Probable). Interaction with LRRC32/GARP controls activation of TGF-beta-1 on the surface of activated regulatory T-cells (Tregs) (PubMed:19651619, PubMed:19750484, PubMed:22278742). Interaction with integrins (ITGAV:ITGB6 or ITGAV:ITGB8) results in distortion of the Latency-associated peptide chain and subsequent release of the active TGF-beta-1 (PubMed:22278742, PubMed:28117447) Multifunctional protein that regulates the growth and differentiation of various cell types and is involved in various processes, such as normal development, immune function, microglia function and responses to neurodegeneration (By similarity). Activation into mature form follows different steps: following cleavage of the proprotein in the Golgi apparatus, Latency-associated peptide (LAP) and Transforming growth factor beta-1 (TGF-beta-1) chains remain non-covalently linked rendering TGF-beta-1 inactive during storage in extracellular matrix (PubMed:29109152). At the same time, LAP chain interacts with 'milieu molecules', such as LTBP1, LRRC32/GARP and LRRC33/NRROS that control activation of TGF-beta-1 and maintain it in a latent state during storage in extracellular milieus (PubMed:19651619, PubMed:19750484, PubMed:2022183, PubMed:22278742, PubMed:8617200, PubMed:8939931). TGF-beta-1 is released from LAP by integrins (ITGAV:ITGB6 or ITGAV:ITGB8): integrin-binding to LAP stabilizes an alternative conformation of the LAP bowtie tail and results in distortion of the LAP chain and subsequent release of the active TGF-beta-1 (PubMed:22278742, PubMed:28117447). Once activated following release of LAP, TGF-beta-1 acts by binding to TGF-beta receptors (TGFBR1 and TGFBR2), which transduce signal (PubMed:20207738). While expressed by many cells types, TGF-beta-1 only has a very localized range of action within cell environment thanks to fine regulation of its activation by Latency-associated peptide chain (LAP) and 'milieu molecules' (By similarity). Plays an important role in bone remodeling: acts as a potent stimulator of osteoblastic bone formation, causing chemotaxis, proliferation and differentiation in committed osteoblasts (By similarity). Can promote either T-helper 17 cells (Th17) or regulatory T-cells (Treg) lineage differentiation in a concentration-dependent manner (By similarity). At high concentrations, leads to FOXP3-mediated suppression of RORC and down-regulation of IL-17 expression, favoring Treg cell development (By similarity). At low concentrations in concert with IL-6 and IL-21, leads to expression of the IL-17 and IL-23 receptors, favoring differentiation to Th17 cells (By similarity). Stimulates sustained production of collagen through the activation of CREB3L1 by regulated intramembrane proteolysis (RIP) (PubMed:25310401). Mediates SMAD2/3 activation by inducing its phosphorylation and subsequent translocation to the nucleus (PubMed:25893292, PubMed:29483653, PubMed:30696809). Positively regulates odontoblastic differentiation in dental papilla cells, via promotion of IPO7-mediated translocation of phosphorylated SMAD2 to the nucleus and subsequent transcription of target genes (By similarity). Can induce epithelial-to-mesenchymal transition (EMT) and cell migration in various cell types (PubMed:25893292, PubMed:30696809)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P01137/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TGFB1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TGFB1","total_profiled":1310},"omim":[{"mim_id":"621364","title":"MICRO RNA 382; MIR382","url":"https://www.omim.org/entry/621364"},{"mim_id":"621340","title":"CYSTEINE-RICH SECRETORY PROTEIN, LCCL DOMAIN-CONTAINING, 1; CRISPLD1","url":"https://www.omim.org/entry/621340"},{"mim_id":"621316","title":"HSP90AB1-ASSOCIATED LONG NONCODING RNA 1; HSALR1","url":"https://www.omim.org/entry/621316"},{"mim_id":"621305","title":"CARDIAC MESODERM ENHANCER-ASSOCIATED NONCODING RNA; CARMN","url":"https://www.omim.org/entry/621305"},{"mim_id":"621228","title":"LONG INTERGENIC NONCODING RNA 1013; LINC01013","url":"https://www.omim.org/entry/621228"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TGFB1"},"hgnc":{"alias_symbol":["CED","TGFbeta"],"prev_symbol":["TGFB","DPD1"]},"alphafold":{"accession":"P01137","domains":[{"cath_id":"2.10.90.10","chopping":"50-97_281-388","consensus_level":"high","plddt":82.2795,"start":50,"end":388},{"cath_id":"2.60.120.970","chopping":"106-240_248-262","consensus_level":"high","plddt":88.299,"start":106,"end":262}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P01137","model_url":"https://alphafold.ebi.ac.uk/files/AF-P01137-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P01137-F1-predicted_aligned_error_v6.png","plddt_mean":79.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TGFB1","jax_strain_url":"https://www.jax.org/strain/search?query=TGFB1"},"sequence":{"accession":"P01137","fasta_url":"https://rest.uniprot.org/uniprotkb/P01137.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P01137/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P01137"}},"corpus_meta":[{"pmid":"9759503","id":"PMC_9759503","title":"TGF-beta signal transduction.","date":"1998","source":"Annual review of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9759503","citation_count":3811,"is_preprint":false},{"pmid":"18662538","id":"PMC_18662538","title":"TGFbeta in Cancer.","date":"2008","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/18662538","citation_count":3337,"is_preprint":false},{"pmid":"22992590","id":"PMC_22992590","title":"TGFβ signalling in context.","date":"2012","source":"Nature reviews. 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biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20938722","citation_count":27,"is_preprint":false},{"pmid":"14713712","id":"PMC_14713712","title":"TGF-beta: how tolerant can it be?","date":"2003","source":"Immunologic research","url":"https://pubmed.ncbi.nlm.nih.gov/14713712","citation_count":27,"is_preprint":false},{"pmid":"32980316","id":"PMC_32980316","title":"The microRNAs miR-302d and miR-93 inhibit TGFB-mediated EMT and VEGFA secretion from ARPE-19 cells.","date":"2020","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/32980316","citation_count":26,"is_preprint":false},{"pmid":"11684832","id":"PMC_11684832","title":"Expression of PDGF-A, TGFb and VCAM-1 during the developmental stages of experimental atherosclerosis.","date":"2001","source":"European surgical research. Europaische chirurgische Forschung. Recherches chirurgicales europeennes","url":"https://pubmed.ncbi.nlm.nih.gov/11684832","citation_count":26,"is_preprint":false},{"pmid":"10887508","id":"PMC_10887508","title":"TGF-beta and functional differentiation.","date":"1996","source":"Journal of mammary gland biology and neoplasia","url":"https://pubmed.ncbi.nlm.nih.gov/10887508","citation_count":25,"is_preprint":false},{"pmid":"9471995","id":"PMC_9471995","title":"Caenorhabditis elegans anti-apoptotic gene ced-9 prevents ced-3-induced cell death in Drosophila cells.","date":"1998","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/9471995","citation_count":25,"is_preprint":false},{"pmid":"14555965","id":"PMC_14555965","title":"Mutational analysis of the interacting cell death regulators CED-9 and CED-4.","date":"1997","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/14555965","citation_count":25,"is_preprint":false},{"pmid":"30397232","id":"PMC_30397232","title":"Aberrant 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Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/16294007","citation_count":22,"is_preprint":false},{"pmid":"29447016","id":"PMC_29447016","title":"TGF-b1 or hypoxia enhance glucose metabolism and lactate production via HIF1A signaling in tendon cells.","date":"2018","source":"Connective tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/29447016","citation_count":22,"is_preprint":false},{"pmid":"21852754","id":"PMC_21852754","title":"Tissue-specific organelle DNA degradation mediated by DPD1 exonuclease.","date":"2011","source":"Plant signaling & behavior","url":"https://pubmed.ncbi.nlm.nih.gov/21852754","citation_count":21,"is_preprint":false},{"pmid":"30121623","id":"PMC_30121623","title":"TGFB1-driven mesenchymal stem cell-mediated NIS gene transfer.","date":"2019","source":"Endocrine-related cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30121623","citation_count":21,"is_preprint":false},{"pmid":"34362797","id":"PMC_34362797","title":"AMBRA1 Promotes TGFβ Signaling via Nonproteolytic Polyubiquitylation of Smad4.","date":"2021","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/34362797","citation_count":21,"is_preprint":false},{"pmid":"33761981","id":"PMC_33761981","title":"Attenuated TGFB signalling in macrophages decreases susceptibility to DMBA-induced mammary cancer in mice.","date":"2021","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/33761981","citation_count":21,"is_preprint":false},{"pmid":"36368447","id":"PMC_36368447","title":"ADAMTS6 cleaves the large latent TGFβ complex and increases the mechanotension of cells to activate TGFβ.","date":"2022","source":"Matrix biology : journal of the International Society for Matrix Biology","url":"https://pubmed.ncbi.nlm.nih.gov/36368447","citation_count":21,"is_preprint":false},{"pmid":"22239102","id":"PMC_22239102","title":"Mutations defective in ribonucleotide reductase activity interfere with pollen plastid DNA degradation mediated by DPD1 exonuclease.","date":"2012","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/22239102","citation_count":20,"is_preprint":false},{"pmid":"32143707","id":"PMC_32143707","title":"TGFβ-mediated expression of TGFβ-activating integrins in SSc monocytes: disturbed activation of latent TGFβ?","date":"2020","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32143707","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44252,"output_tokens":5117,"usd":0.104756,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13410,"output_tokens":4818,"usd":0.09375,"stage2_stop_reason":"end_turn"},"total_usd":0.198506,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"TGF-β signals through cell-surface type I and type II serine/threonine kinase receptors; ligand binding recruits and transphosphorylates the type I receptor, which then phosphorylates SMAD2/3 on C-terminal SSXS motifs, inducing their association with SMAD4 and nuclear translocation to activate target gene transcription.\",\n      \"method\": \"Biochemical pathway reconstitution, phosphorylation assays, receptor mutagenesis, nuclear translocation studies\",\n      \"journal\": \"Annual review of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted mechanistic pathway with multiple orthogonal methods, independently replicated across many labs over years\",\n      \"pmids\": [\"9759503\", \"9525694\", \"10879283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"TGF-β binds to cell surface receptors of 55 kDa (type I) and 70 kDa (type II); inhibitors of serine/threonine kinase activity block transcriptional and growth-inhibitory responses to TGF-β; the proteoglycan betaglycan binds TGF-β via its core protein and may regulate TGF-β interaction with signaling receptors.\",\n      \"method\": \"Receptor purification and binding assays, kinase inhibitor studies, molecular cloning, biochemical characterization\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical receptor identification with functional validation and mutagenesis, replicated across labs\",\n      \"pmids\": [\"1322148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TGF-β activates Ras, ERKs, and SAPKs in epithelial cells; the MEK/ERK pathway is required for TGF-β autoinduction via AP-1 (JunD/Fra-2) binding to the TGFβ1 promoter; Smad3 is required for autoinduction independently of Smad4; ERK-mediated phosphorylation of the Smad1 linker region controls Smad1-Smad4 interaction and nuclear accumulation.\",\n      \"method\": \"Dominant-negative constructs (RasN17, DN-MKK4, DN-Smad3), MEK inhibitor (PD98059), reporter assays, supershift assays, promoter activity assays\",\n      \"journal\": \"Cytokine & growth factor reviews\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with dominant-negatives and pharmacological inhibition, multiple orthogonal assays, single lab\",\n      \"pmids\": [\"10708950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Receptor-regulated SMADs (SMAD2/3) are anchored to the cell membrane by SARA (Smad anchor for receptor activation); upon TGF-β stimulation they are phosphorylated by the type I receptor kinase and form oligomeric complexes with SMAD4 that translocate to the nucleus; inhibitory SMADs (SMAD6/7) block receptor-mediated R-SMAD phosphorylation and their expression is induced by TGF-β, forming a negative autofeedback loop.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, subcellular fractionation, reporter assays, gene targeting\",\n      \"journal\": \"Advances in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, functional phosphorylation assays, and genetic models, replicated across multiple labs\",\n      \"pmids\": [\"10879283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TGF-β signals via the canonical ALK5/Smad3 pathway to induce myofibroblast transdifferentiation and matrix preservation; Smad-independent pathways (MAPK, JNK, p38) modulate Smad activation and can directly transduce fibrogenic signals; the downstream effector connective tissue growth factor (CTGF) mediates profibrotic actions of TGF-β.\",\n      \"method\": \"In vitro fibroblast transdifferentiation assays, kinase inhibition, loss-of-function studies in experimental models\",\n      \"journal\": \"Growth factors (Chur, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple experimental models with pathway-specific inhibitors, replicated across labs\",\n      \"pmids\": [\"21740331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SMAD2 and SMAD3 are subject to post-translational modifications including phosphorylation (C-terminal receptor-mediated and linker region by MAPKs), ubiquitination, sumoylation, acetylation, and poly(ADP)-ribosylation that regulate their activity and stability.\",\n      \"method\": \"Biochemical modification assays, mutagenesis, proteasomal degradation studies\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple PTMs established by direct biochemical assays, reviewed from multiple lab studies\",\n      \"pmids\": [\"21643690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"USP11 deubiquitylase interacts with SMAD7 and deubiquitylates the type I TGF-β receptor (ALK5), thereby stabilizing it and enhancing TGF-β-induced SMAD2/3 phosphorylation and transcriptional responses; RNAi depletion of USP11 inhibits SMAD2/3 phosphorylation, and USP11 deubiquitylase activity is required for this effect.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, RNAi knockdown, SMAD2/3 phosphorylation assays, reporter assays\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional ubiquitylation assays and deubiquitylase activity requirement, single lab\",\n      \"pmids\": [\"22773947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TGF-β is produced as an inactive (latent) complex that must be activated to bind its receptor; members of the integrin receptor family (particularly αV integrins) play crucial roles in activating latent TGFβ, controlling its availability to signal.\",\n      \"method\": \"Cell-based TGF-β activation assays, integrin loss-of-function studies, biochemical activation assays\",\n      \"journal\": \"Trends in biochemical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cell-based activation assays with integrin mutants, reviewed from multiple studies\",\n      \"pmids\": [\"20870411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Latent TGFβ binding proteins (LTBPs) are cross-linked by transglutaminase-2 (TG2) to fibrillin in the extracellular matrix; TG2 cross-links LTBP-1 and LTBP-3 to fibrillin, and the resulting fibrillin-LTBP1 complex shows a perpendicular arrangement; cross-linking does not alter integrin αVβ6 interaction with latent TGFβ but increases TGFβ activation in cell-based assays, likely by directing latent complexes to the cell surface.\",\n      \"method\": \"In vitro cross-linking assays, structural analysis of fibrillin-LTBP1 complex, cell-based TGFβ activation assays, heparan sulphate competition experiments\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical cross-linking, structural characterization, and cell-based functional assays, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35122964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADAMTS6 metalloprotease directly cleaves LTBP1 and LTBP3, components of the large latent TGFβ complex, and binds these complexes; ADAMTS6 expression also increases cellular mechanotension, leading to YAP/TAZ nuclear translocation; both mechanisms contribute to TGFβ activation from large latent complexes, and catalytic activity of ADAMTS6 is required for effective TGFβ activation.\",\n      \"method\": \"Cell-based TGFβ activation assays, proteolytic cleavage assays, mechanotension measurements, YAP/TAZ localization assays, catalytic mutant analysis\",\n      \"journal\": \"Matrix biology : journal of the International Society for Matrix Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cleavage assays, mechanotension measurements, and functional TGFβ activation assays with catalytic mutants, single lab\",\n      \"pmids\": [\"36368447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TGF-β transcriptionally induces NUAK1 and NUAK2 kinases via SMAD2/3/4 and MAPK pathways; a SMAD-responsive enhancer within the first intron of NUAK2 recruits SMAD proteins; NUAK2 forms protein complexes with SMAD3 and the TGFβ type I receptor; NUAK1 negatively and NUAK2 positively regulate TGFβ-induced cytostasis, mesenchymal differentiation, and myofibroblast contractility.\",\n      \"method\": \"Chromatin immunoprecipitation, reporter assays, co-immunoprecipitation, siRNA knockdown, cell functional assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus genomic mapping and loss-of-function phenotypes, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30622137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TNFRSF19 binds the kinase domain of TGFβ type I receptor (TβRI) in the cytoplasm, blocking association of SMAD2/3 with TβRI and subsequent phosphorylation; ectopic TNFRSF19 expression confers resistance to TGFβ-induced cell-cycle arrest; TNFRSF19 knockout unleashes SMAD2/3 phosphorylation and TGFβ target gene transcription.\",\n      \"method\": \"Co-immunoprecipitation, kinase domain interaction mapping, SMAD2/3 phosphorylation assays, CRISPR knockout, proliferation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-IP with domain mapping, SMAD phosphorylation and gene expression readouts, CRISPR KO, single lab\",\n      \"pmids\": [\"29735548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AMBRA1 serves as the substrate receptor in the CUL4-RING ubiquitin ligase (CRL4) complex and mediates nonproteolytic K63-linked polyubiquitylation of SMAD4, enhancing its transcriptional activity; AMBRA1 potentiates TGFβ signaling and promotes TGFβ-induced EMT, migration, and invasion in breast cancer cells and metastasis in mouse models.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, SMAD4 transcriptional reporter assays, siRNA knockdown, mouse tumor models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ubiquitylation assays, co-IP, reporter assays with functional cancer phenotypes in vivo, single lab\",\n      \"pmids\": [\"34362797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TIEG (TGF-β inducible early gene), a Krüppel-like transcription factor, enhances TGFβ/SMAD-dependent transcription by binding and repressing the Smad7 gene promoter; TIEG overexpression enhances TGFβ-induced Smad2 phosphorylation and induction of p21 and PAI-1; this effect requires Smad4 and is blocked by Smad7 overexpression.\",\n      \"method\": \"Reporter assays (SBE-luciferase), endogenous gene expression assays, Smad2 phosphorylation assays, promoter binding assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays (reporter, endogenous genes, phosphorylation) with epistasis, single lab\",\n      \"pmids\": [\"12173049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TGFB1 is necessary and sufficient to induce a fetal-like/regenerative transcriptional state in intestinal organoids; mechanistically, TGFB1 activates pro-regenerative factors YAP/TEAD and SOX9 in the epithelium; macrophage-derived TGFB1 surge at 2 days post-irradiation mediates intestinal regeneration, and genetic disruption of TGFB signaling or macrophage depletion impairs the regenerative response.\",\n      \"method\": \"Mouse genetics, organoid culture, macrophage depletion, RNA sequencing, TGFB1 treatment, in vivo engraftment assays\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function, organoid reconstitution, and mechanistic pathway identification (YAP/TEAD, SOX9), single study with multiple orthogonal methods\",\n      \"pmids\": [\"37865088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SMAD7 recruits E3 ubiquitin ligases (Smurf1/2) to TGFβ receptors, targeting them for ubiquitin-mediated proteasomal degradation, thereby negatively regulating TGFβ receptor stability and duration of signaling.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, receptor degradation assays, knockdown studies\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ubiquitylation assays, reviewed from multiple lab studies\",\n      \"pmids\": [\"19030025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TGFβ1 stimulation of monocytes induces expression of integrin subunits ITGA5 and ITGAV (but lowers ITGB8), establishing a feedback regulatory loop; in SSc patients, reduced expression of TGFβ-activating integrins (ITGA5, ITGAV, ITGB3, ITGB5, ITGB8) on monocytes correlates with decreased TGFβ activation in serum despite normal total TGFβ levels.\",\n      \"method\": \"Luciferase TGFβ reporter assays on primary fibroblasts, rhTGFβ1 stimulation, TGFBR1 inhibitor (SB-505124), qPCR of integrin expression, acid activation of serum\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-method gene expression modulation with pharmacological inhibitor, limited mechanistic depth, single lab\",\n      \"pmids\": [\"32143707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Intermittent compressive mechanical force applied to human periodontal ligament (hPDL) fibroblasts promotes intracellular accumulation (not secretion) of TGF-β1, which then drives expression of SOST and POSTN; blocking TGF-β1 with a neutralizing antibody or TGFβ receptor inhibitor (SB431542) attenuates force-induced SOST and POSTN expression.\",\n      \"method\": \"Compressive force loading, cycloheximide treatment, TGFβR1 inhibitor (SB431542), neutralizing antibody, ELISA, Western blot, RT-PCR\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pharmacological and antibody inhibition studies in a single cell type, single lab, limited mechanistic resolution of the pathway\",\n      \"pmids\": [\"25870205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TGF-β1 and hypoxia enhance glucose metabolism and lactate production in tendon cells via HIF1A signaling, activating a Warburg-type glycolytic reprogramming; this was shown both in vivo (murine TGF-β1 injection model) and in vitro in tendon explants.\",\n      \"method\": \"In vivo murine injection, in vitro tendon explant culture, immunohistochemistry, gene expression profiling\",\n      \"journal\": \"Connective tissue research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — correlative expression with limited direct mechanistic dissection of the TGFβ-HIF1A axis, single lab\",\n      \"pmids\": [\"29447016\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TGFB1 signals as a secreted cytokine (produced in inactive latent complexes that are activated extracellularly by integrins, proteases such as ADAMTS6, and matrix cross-linking by transglutaminase-2/fibrillin) by binding cell-surface type II serine/threonine kinase receptors that recruit and transphosphorylate type I receptors (ALK5), which in turn phosphorylate SMAD2/3 on C-terminal SSXS motifs; phosphorylated SMAD2/3 complex with SMAD4 and translocate to the nucleus to regulate target gene transcription in cooperation with context-specific DNA-binding partners and co-regulators; signaling duration is controlled by SMAD7-mediated receptor ubiquitylation/degradation (counteracted by the deubiquitylase USP11), nonproteolytic polyubiquitylation of SMAD4 by CRL4-AMBRA1 enhancing its transcriptional output, MAPK-mediated phosphorylation of SMAD linker regions, and feedback target genes such as TIEG; in parallel, TGFB1 activates non-SMAD pathways including Ras/MAPK/ERK and SAPK that contribute to autoinduction and crosstalk with SMAD signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TGFB1 is a secreted cytokine that controls cytostasis, mesenchymal/myofibroblast differentiation, extracellular matrix production, and tissue regeneration by signaling through a cell-surface serine/threonine kinase receptor system [#0, #1]. It is produced as an inactive latent complex whose bioavailability is set extracellularly: latent TGFB1-binding proteins (LTBP1/LTBP3) are cross-linked to fibrillin by transglutaminase-2 to position latent complexes at the cell surface [#8], αV integrins activate the latent ligand [#7], and the metalloprotease ADAMTS6 cleaves LTBP1/LTBP3 while raising mechanotension to drive YAP/TAZ-dependent activation [#9]. Once activated, ligand binding to the type II receptor recruits and transphosphorylates the type I receptor (ALK5), which phosphorylates SMAD2/3 on C-terminal SSXS motifs; SARA anchors R-SMADs at the membrane for this step, and phosphorylated SMAD2/3 then complex with SMAD4 and translocate to the nucleus to direct target gene transcription [#0, #3]. Signal strength and duration are tuned by an interlocking regulatory network: inhibitory SMAD7 recruits Smurf1/2 to ubiquitylate and degrade the receptor [#3, #15], a step opposed by the deubiquitylase USP11, which stabilizes ALK5 and amplifies SMAD2/3 phosphorylation [#6]; the CRL4 substrate receptor AMBRA1 adds nonproteolytic K63-linked ubiquitin to SMAD4 to enhance its transcriptional output [#12]; and intracellular antagonists such as TNFRSF19 block SMAD2/3 access to the receptor kinase domain [#11]. In parallel, TGFB1 engages non-SMAD effectors—Ras/ERK and SAPK/JNK/p38—that feed back on SMAD activity, mediate autoinduction through AP-1 at the TGFB1 promoter, and transduce fibrogenic signals together with effectors such as CTGF [#2, #4]. Transcriptional feedback loops, including the Krüppel-like factor TIEG (which represses SMAD7) and induction of NUAK1/NUAK2 kinases that bind SMAD3 and ALK5, further shape responses such as cytostasis and myofibroblast contractility [#13, #10]. Functionally, macrophage-derived TGFB1 drives a fetal-like regenerative epithelial state via YAP/TEAD and SOX9 during intestinal repair [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that TGFB1 acts through discrete cell-surface receptors with kinase activity, defining the receptor-based logic of the pathway.\",\n      \"evidence\": \"Receptor purification/binding assays, kinase inhibitor studies, and cloning identifying ~55 kDa type I and ~70 kDa type II receptors and the accessory proteoglycan betaglycan\",\n      \"pmids\": [\"1322148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how receptor kinases transmit signal to intracellular effectors\", \"Role of betaglycan in receptor presentation only partially defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolved the core transduction mechanism, showing how receptor activation is relayed to the nucleus via SMAD phosphorylation and complex formation.\",\n      \"evidence\": \"Pathway reconstitution, phosphorylation assays, receptor mutagenesis, and nuclear translocation studies defining type II→type I transphosphorylation and SMAD2/3 SSXS phosphorylation feeding SMAD4 complex formation\",\n      \"pmids\": [\"9759503\", \"9525694\", \"10879283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context-specific DNA-binding partners not enumerated\", \"Did not address feedback control of signal duration\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined membrane anchoring and negative feedback of R-SMADs, explaining how signaling is spatially organized and self-limited.\",\n      \"evidence\": \"Co-IP, phosphorylation assays, subcellular fractionation, and gene targeting showing SARA-mediated R-SMAD anchoring and inhibitory SMAD6/7 induction as an autofeedback loop\",\n      \"pmids\": [\"10879283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which inhibitory SMADs block phosphorylation not fully detailed here\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed that TGFB1 also activates non-SMAD kinase cascades that feed back on SMAD activity and drive ligand autoinduction.\",\n      \"evidence\": \"Dominant-negative constructs, MEK inhibition, reporter and supershift assays linking Ras/ERK/SAPK, AP-1 (JunD/Fra-2) promoter binding, and Smad linker phosphorylation\",\n      \"pmids\": [\"10708950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Generalization beyond epithelial cells not established\", \"Quantitative contribution of each kinase arm unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified a transcriptional feedback factor that amplifies SMAD signaling by repressing the inhibitory SMAD7 gene.\",\n      \"evidence\": \"SBE-luciferase reporters, endogenous p21/PAI-1 induction, Smad2 phosphorylation, and promoter-binding assays with TIEG, dependent on Smad4 and blocked by Smad7\",\n      \"pmids\": [\"12173049\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA-binding kinetics of TIEG at the Smad7 promoter not resolved\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mechanistically explained receptor turnover as a brake on signaling through SMAD7-directed ubiquitylation.\",\n      \"evidence\": \"Co-IP, ubiquitylation, and receptor degradation assays showing SMAD7 recruits Smurf1/2 to degrade TGFβ receptors\",\n      \"pmids\": [\"19030025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Counter-regulatory deubiquitylation not addressed in this work\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed latent ligand activation by integrins at the center of controlling TGFB1 availability.\",\n      \"evidence\": \"Cell-based activation assays with integrin loss-of-function, particularly αV integrins, on latent TGFβ complexes\",\n      \"pmids\": [\"20870411\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Force- versus protease-dependent activation modes not disentangled here\", \"Tissue-specific integrin usage unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Catalogued the breadth of post-translational control over SMAD2/3 activity and stability.\",\n      \"evidence\": \"Biochemical modification assays and mutagenesis documenting phosphorylation, ubiquitination, sumoylation, acetylation, and poly(ADP)-ribosylation\",\n      \"pmids\": [\"21643690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional hierarchy among the PTMs not established\", \"Enzymes for several modifications not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected canonical and non-SMAD arms to a defined fibrogenic output via myofibroblast differentiation and CTGF.\",\n      \"evidence\": \"Fibroblast transdifferentiation assays with pathway-specific kinase inhibition and loss-of-function in experimental fibrosis models\",\n      \"pmids\": [\"21740331\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative dependence on ALK5/Smad3 versus MAPK/JNK/p38 context-dependent and not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the deubiquitylase that opposes SMAD7-driven receptor degradation, completing a ubiquitin-based rheostat on signal duration.\",\n      \"evidence\": \"Co-IP, ubiquitylation and RNAi assays showing USP11 binds SMAD7, deubiquitylates ALK5, and its catalytic activity is required to sustain SMAD2/3 phosphorylation\",\n      \"pmids\": [\"22773947\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; in vivo physiological role not established\", \"Regulation of USP11 recruitment unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed an intracellular receptor antagonist that gates SMAD recruitment and sets TGFB1 cytostatic sensitivity.\",\n      \"evidence\": \"Co-IP with kinase-domain mapping, SMAD2/3 phosphorylation readouts, CRISPR knockout, and proliferation assays for TNFRSF19 binding to TβRI\",\n      \"pmids\": [\"29735548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts where TNFRSF19 limits signaling not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a kinase feedback module wherein TGFB1 induces NUAK1/2 that bind the signaling machinery and bidirectionally tune responses.\",\n      \"evidence\": \"ChIP, reporter assays, co-IP, and siRNA showing SMAD-responsive NUAK2 enhancer, NUAK2–SMAD3/TβRI complexes, and opposing NUAK1/NUAK2 effects on cytostasis and myofibroblast contractility\",\n      \"pmids\": [\"30622137\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrates of NUAK kinases within the pathway not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed nonproteolytic ubiquitylation of SMAD4 as a positive amplifier of transcriptional output with pro-metastatic consequences.\",\n      \"evidence\": \"Co-IP, K63 ubiquitylation assays, SMAD4 reporters, siRNA, and mouse tumor models for CRL4-AMBRA1\",\n      \"pmids\": [\"34362797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this regulation operates outside breast cancer unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mechanistically dissected extracellular latent-complex activation through matrix cross-linking and proteolysis.\",\n      \"evidence\": \"In vitro cross-linking and structural analysis of fibrillin–LTBP1 with cell-based activation (TG2) and direct LTBP1/3 cleavage plus mechanotension/YAP-TAZ assays with catalytic mutants (ADAMTS6)\",\n      \"pmids\": [\"35122964\", \"36368447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interplay between cross-linking, proteolysis, and integrin activation not integrated\", \"Single-lab studies\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a physiological regenerative function in which macrophage-derived TGFB1 reprograms epithelium to a fetal-like state.\",\n      \"evidence\": \"Mouse genetics, organoid reconstitution, macrophage depletion, RNA-seq, and engraftment assays linking TGFB1 to YAP/TEAD and SOX9 in intestinal regeneration\",\n      \"pmids\": [\"37865088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the same circuit operates in other regenerating tissues unknown\", \"Direct versus indirect epithelial targets not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple latent-activation modes (integrins, proteases, matrix cross-linking, mechanical force) are integrated with intracellular feedback to produce context-specific, quantitatively defined outputs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking activation mode to downstream transcriptional program\", \"Tissue-specific cofactors that direct cytostatic versus fibrogenic versus regenerative outcomes not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 4, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0031012\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SMAD2\", \"SMAD3\", \"SMAD4\", \"SMAD7\", \"ALK5/TGFBR1\", \"ITGAV\", \"LTBP1\", \"TNFRSF19\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}