{"gene":"TGFA","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2007,"finding":"Concomitant pancreatic expression of TGFα (Tgfa) and oncogenic Kras(G12D) accelerates progression of mPanIN lesions to metastatic pancreatic cancer and drives development of cystic papillary lesions resembling human IPMN, indicating that EGFR signaling (activated by TGFα) synergizes with oncogenic Kras in pancreatic carcinogenesis.","method":"Genetic epistasis / transgenic mouse model: Elastase-Tgfa mice crossed with p48(+/Cre);Kras(+/LSL-G12D) mice; histopathology and microarray analysis","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis in vivo with defined tumor phenotype and transcriptomic validation, single lab","pmids":["17785207"],"is_preprint":false},{"year":2010,"finding":"TGFA is secreted by papillary thyroid carcinoma (PTC) cell lines into conditioned medium and activates EGFR on target cells, resulting in ERK and AKT phosphorylation; in NIM-1 PTC cells harboring BRAF mutation, TGFA stimulates proliferation and contributes to PI3K/AKT activation independently of MEK/ERK signaling.","method":"Biochemical analysis of PTC cell lines: detection of EGFR on cell membrane and TGFA in conditioned media; conditioned medium activation of EGFR on HeLa cells with ERK/AKT phosphorylation readout; proliferation assays with TGFA stimulation and pathway inhibitors","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal in vitro methods (conditioned media, receptor activation, kinase assays, proliferation), single lab","pmids":["20877637"],"is_preprint":false},{"year":2010,"finding":"TGFα treatment of NPC CNE2 cells triggers EGFR-dependent tyrosine phosphorylation of ANXA3, KRT8, and KRT18, identifying these as novel downstream substrates of EGFR signaling activated by TGFA.","method":"Functional proteomics: 2-DE, 2-D western blotting, mass spectrometry, and IP-western blotting of TGFα-treated vs. control CNE2 cells","journal":"Medical oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — IP-western validation of phosphoproteomics hits, single lab, single study","pmids":["20049563"],"is_preprint":false},{"year":2016,"finding":"Triiodothyronine (T3) upregulates TGFA mRNA expression in MCF7 breast cancer cells via PI3K activation; this upregulation is dependent on active gene transcription (blocked by actinomycin D at early time points) but does not require MAPK/ERK pathway activation.","method":"RT-PCR in MCF7 cells treated with T3 in presence/absence of actinomycin D (transcription inhibitor), cycloheximide (translation inhibitor), and LY294002 (PI3K inhibitor)","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with multiple inhibitors, two orthogonal pathway inhibitors tested, single lab","pmids":["27094789"],"is_preprint":false},{"year":2019,"finding":"T3 at physiological concentration increases TGFA mRNA expression in MCF7 cells independently of MAPK/ERK pathway activation; inhibition of RNA polymerase II modulates this T3-induced TGFA expression, confirming transcriptional regulation.","method":"RT-PCR with α-amanitin (RNA Pol II inhibitor) and PD98059 (MAPK/ERK inhibitor) in T3-treated MCF7 cells","journal":"Archives of endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection replicating and extending prior finding from same group, two pathway inhibitors, single lab","pmids":["30916164"],"is_preprint":false},{"year":2017,"finding":"miR-137 directly targets the 3' UTR of TGFA in non-small cell lung cancer cells; miR-137 overexpression reduces TGFA protein levels and suppresses NSCLC cell proliferation, while TGFA knockdown alone phenocopies this suppression.","method":"Dual-luciferase reporter assay (direct 3' UTR targeting), western blot (TGFA protein), MTT assay and flow cytometry (proliferation/cell cycle), qRT-PCR","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase validation of direct miRNA-target interaction plus functional rescue experiments, single lab","pmids":["28239819"],"is_preprint":false},{"year":2021,"finding":"miR-374b directly targets and negatively regulates TGFA in breast cancer cells; TGFA contributes to malignant behavior (proliferation, invasion, colony formation, tumor growth), and overexpression of TGFA reverses the tumor-suppressive phenotypes caused by miR-374b overexpression.","method":"Bioinformatics target prediction, in vitro and in vivo functional assays (2D/3D proliferation, invasion, xenograft), rescue experiments with TGFA overexpression","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo xenograft plus in vitro rescue experiments, multiple orthogonal phenotypic readouts, single lab","pmids":["33480984"],"is_preprint":false},{"year":2021,"finding":"miR-376c directly targets the 3' UTR of TGFA; miR-376c overexpression suppresses TGFA expression and inhibits osteosarcoma Saos-2 cell growth and proliferation; cisplatin upregulates miR-376c and downregulates TGFA in a concentration-dependent manner, and TGFA overexpression reverses cisplatin-induced growth inhibition.","method":"Luciferase reporter assay (3' UTR direct targeting), TGFA-shRNA knockdown, TGFA ORF overexpression, MTT and BrdU proliferation assays, qRT-PCR, western blot","journal":"Bosnian journal of basic medical sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase validation of direct miRNA-TGFA interaction, gain- and loss-of-function with rescue, single lab","pmids":["32020849"],"is_preprint":false},{"year":2017,"finding":"IL-1β activates NF-κB signaling, which suppresses miR-376c expression, thereby relieving miR-376c-mediated repression of TGFA and promoting osteosarcoma cell growth; NF-κB knockdown suppresses TGFA expression and attenuates the TGFA increase induced by IL-1β.","method":"miR-376c/TGFA expression in OS tissues and cells; forced miR-376c expression; NF-κB knockdown; western blot for NF-κB and TGFA protein levels","journal":"Die Pharmazie","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway inference from single lab using western blot and overexpression without full mechanistic reconstitution","pmids":["29441940"],"is_preprint":false},{"year":2023,"finding":"miR-7-5p directly targets TGFA 3' UTR; circ_0006667 sponges miR-7-5p, thereby upregulating TGFA expression in retinal pigment epithelial cells under high-glucose conditions; miR-7-5p overexpression protects cells from high-glucose-induced dysfunction largely by downregulating TGFA.","method":"Dual-luciferase reporter and RNA immunoprecipitation (RIP) assays, RT-qPCR, western blot, MTT, EdU, flow cytometry","journal":"International ophthalmology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, luciferase plus RIP for target validation, but limited independent replication","pmids":["36715959"],"is_preprint":false},{"year":2012,"finding":"IRF6 and TGFA genetically interact in the etiology of cleft lip/palate; Tgfa is not expressed in palatal tissues of Irf6 knockout mice, placing IRF6 upstream of TGFA in palatogenesis.","method":"Statistical gene-gene interaction analyses in multiple human cohorts; expression analysis of Tgfa and Irf6 in wild-type vs. Irf6 knockout mouse palatal tissues at critical stages of palatogenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis confirmed in mouse KO model plus replicated interaction in four independent human cohorts","pmids":["23029012"],"is_preprint":false},{"year":2025,"finding":"TGFA binds to DSG2 (desmoglein 2) and activates downstream c-MYC/ADAM17 pathway, promoting cervical cancer cell proliferation, metastasis, and autophagy; TGFA knockdown inhibits tumor growth in vivo.","method":"RNA pull-down assay (TGFA-DSG2 interaction), western blot, MTT, flow cytometry, Transwell assay, nude mouse xenograft; RT-qPCR","journal":"Cell cycle","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RNA pull-down for protein interaction, single lab, limited orthogonal validation of the TGFA-DSG2 binding","pmids":["42154444"],"is_preprint":false},{"year":2025,"finding":"In mouse extrahepatic bile duct, Tgfa is expressed in cholangiocytes at homeostasis and its levels increase after bile duct obstruction along with Egfr upregulation; EGFR activation (to which Tgfa contributes as a ligand) drives cholangiocyte proliferation and bile duct regeneration after injury.","method":"Transcriptomic and immunohistochemistry analyses of mouse EHBD at homeostasis and after bile duct ligation; biliary organoid assays with recombinant EGFR ligands and EGFR/ERBB2 inhibitors; in vivo EGFR inhibition after obstruction","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, Tgfa identified as one of several ligands without specific Tgfa loss-of-function experiment","pmids":[],"is_preprint":true}],"current_model":"TGFA encodes a ligand for EGFR that acts in autocrine/paracrine signaling loops: it is transcriptionally regulated downstream of IRF6 during palatogenesis and downstream of T3/PI3K (but not MAPK/ERK) in breast cancer cells; it activates EGFR to trigger ERK and AKT phosphorylation, driving proliferation in multiple cancer contexts (pancreatic, thyroid, lung, breast, osteosarcoma, cervical), and it is post-transcriptionally repressed by several miRNAs (miR-137, miR-374b, miR-376c, miR-7-5p); in pancreatic tissue, TGFα synergizes with oncogenic Kras(G12D) through EGFR to promote IPMN and pancreatic cancer progression, and in cervical cancer it binds DSG2 to activate a c-MYC/ADAM17 downstream pathway."},"narrative":{"mechanistic_narrative":"TGFA encodes a secreted ligand for the EGF receptor (EGFR) that drives autocrine and paracrine proliferative signaling across multiple epithelial and cancer contexts [PMID:20877637]. Secreted TGFα activates EGFR on target cells, triggering downstream ERK and AKT phosphorylation; in BRAF-mutant papillary thyroid carcinoma cells this stimulates proliferation via PI3K/AKT independently of MEK/ERK [PMID:20877637], and in nasopharyngeal carcinoma cells TGFα-activated EGFR drives tyrosine phosphorylation of substrates including ANXA3, KRT8, and KRT18 [PMID:20049563]. TGFA expression is controlled at multiple levels: transcriptionally, T3 induces TGFA in breast cancer cells through PI3K and RNA polymerase II-dependent transcription but not MAPK/ERK [PMID:27094789, PMID:30916164], and IRF6 acts upstream of Tgfa during palatogenesis, where the two genes genetically interact in cleft lip/palate etiology [PMID:23029012]; post-transcriptionally, several miRNAs (miR-137, miR-374b, miR-376c) directly target the TGFA 3' UTR to repress its expression and suppress proliferation in lung, breast, and osteosarcoma cells, with TGFA re-expression rescuing the malignant phenotype [PMID:28239819, PMID:33480984, PMID:32020849]. In pancreatic tissue, TGFα synergizes with oncogenic Kras(G12D) through EGFR to accelerate progression to metastatic cancer and IPMN-like lesions [PMID:17785207].","teleology":[{"year":2007,"claim":"Established that TGFα-driven EGFR signaling cooperates with oncogenic Kras to promote pancreatic carcinogenesis, defining a genetic synergy in tumor progression.","evidence":"Transgenic mouse genetic epistasis crossing Elastase-Tgfa with p48-Cre;Kras-G12D mice, with histopathology and microarray","pmids":["17785207"],"confidence":"Medium","gaps":["Does not resolve which EGFR-downstream effectors mediate the synergy","No TGFα loss-of-function to test necessity"]},{"year":2010,"claim":"Showed that TGFα is secreted and activates EGFR on recipient cells to drive ERK/AKT phosphorylation and proliferation, with PI3K/AKT contribution independent of MEK/ERK in thyroid carcinoma.","evidence":"Conditioned-medium EGFR activation assays, kinase readouts, and proliferation assays with pathway inhibitors in PTC cell lines","pmids":["20877637"],"confidence":"Medium","gaps":["Single lab, in vitro only","Relative contributions of ERK vs AKT to proliferation not fully quantified"]},{"year":2010,"claim":"Identified concrete EGFR substrates downstream of TGFα stimulation, linking ligand activity to specific phosphorylation events.","evidence":"Phosphoproteomics (2-DE, MS) with IP-western validation in TGFα-treated CNE2 nasopharyngeal carcinoma cells","pmids":["20049563"],"confidence":"Medium","gaps":["Functional consequence of ANXA3/KRT8/KRT18 phosphorylation unknown","Single study"]},{"year":2012,"claim":"Placed IRF6 upstream of TGFA in palatogenesis, providing a developmental transcriptional context and disease relevance for TGFA in cleft lip/palate.","evidence":"Gene-gene interaction analysis across human cohorts plus Tgfa expression analysis in Irf6 knockout mouse palatal tissue","pmids":["23029012"],"confidence":"Medium","gaps":["Direct transcriptional regulation of TGFA by IRF6 not demonstrated","Mechanism connecting TGFA loss to clefting unresolved"]},{"year":2017,"claim":"Defined miRNA-mediated post-transcriptional repression of TGFA as a tumor-suppressive axis, with direct 3' UTR targeting and functional rescue.","evidence":"Dual-luciferase reporter, western blot, and proliferation/rescue assays for miR-137 (NSCLC), later extended to miR-374b (breast) and miR-376c (osteosarcoma)","pmids":["28239819","33480984","32020849"],"confidence":"Medium","gaps":["Which miRNA dominates in a given tissue is unclear","EGFR pathway engagement downstream of TGFA in these rescue settings not directly measured"]},{"year":2016,"claim":"Demonstrated hormone-driven transcriptional induction of TGFA, showing T3 upregulates TGFA via PI3K and RNA Pol II-dependent transcription, not MAPK/ERK.","evidence":"RT-PCR with actinomycin D, cycloheximide, LY294002, α-amanitin, and PD98059 in T3-treated MCF7 cells (two studies)","pmids":["27094789","30916164"],"confidence":"Medium","gaps":["Transcription factor mediating T3/PI3K induction of TGFA not identified","Single group"]},{"year":2017,"claim":"Linked inflammatory signaling to TGFA control, showing IL-1β/NF-κB suppresses miR-376c to relieve TGFA repression.","evidence":"NF-κB knockdown, forced miR-376c expression, and western blot in osteosarcoma cells/tissues","pmids":["29441940"],"confidence":"Low","gaps":["Pathway inferred without full mechanistic reconstitution","Direct NF-κB regulation of the miR-376c locus not shown"]},{"year":2023,"claim":"Extended TGFA regulation to a circRNA-miRNA-TGFA axis in a non-cancer context (retinal pigment epithelium under high glucose).","evidence":"Dual-luciferase and RIP assays, with miR-7-5p/circ_0006667 manipulation in RPE cells","pmids":["36715959"],"confidence":"Low","gaps":["Single lab, limited independent replication","TGFA effector mechanism in RPE dysfunction not detailed"]},{"year":2025,"claim":"Proposed a non-EGFR partner for TGFA, reporting TGFA-DSG2 binding driving a c-MYC/ADAM17 pathway in cervical cancer.","evidence":"RNA pull-down for TGFA-DSG2 interaction plus phenotypic and xenograft assays","pmids":["42154444"],"confidence":"Low","gaps":["RNA pull-down for a protein-protein interaction is unconventional and lacks orthogonal binding validation","Relationship between DSG2 axis and canonical EGFR signaling unresolved"]},{"year":2025,"claim":"Implicated Tgfa as one of several EGFR ligands in cholangiocyte proliferation and bile duct regeneration after injury.","evidence":"Transcriptomics, IHC, and biliary organoid assays with EGFR ligands/inhibitors after bile duct ligation in mouse (preprint)","pmids":[],"confidence":"Low","gaps":["Preprint without Tgfa-specific loss-of-function","Tgfa contribution not separated from other EGFR ligands"]},{"year":null,"claim":"How TGFA processing, secretion, and ligand availability are coordinated with its multiple transcriptional and post-transcriptional inputs across tissues remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural or biophysical characterization of TGFα-EGFR binding in the corpus","Whether non-EGFR partners such as DSG2 are physiologically relevant is unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[1,2,0]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,6]}],"complexes":[],"partners":["EGFR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P01135","full_name":"Protransforming growth factor alpha","aliases":[],"length_aa":160,"mass_kda":17.0,"function":"TGF alpha is a mitogenic polypeptide that is able to bind to the EGF receptor/EGFR and to act synergistically with TGF beta to promote anchorage-independent cell proliferation in soft agar","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P01135/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TGFA","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TGFA","total_profiled":1310},"omim":[{"mim_id":"618258","title":"SEC11 HOMOLOG A, SIGNAL PEPTIDASE COMPLEX SUBUNIT; SEC11A","url":"https://www.omim.org/entry/618258"},{"mim_id":"617515","title":"RHOMBOID DOMAIN-CONTAINING 1; RHBDD1","url":"https://www.omim.org/entry/617515"},{"mim_id":"615943","title":"MEMBRANE-ASSOCIATED GUANYLATE KINASE, WW AND PDZ DOMAINS-CONTAINING, 3; MAGI3","url":"https://www.omim.org/entry/615943"},{"mim_id":"614719","title":"POTASSIUM CHANNEL MODULATORY FACTOR 1; KCMF1","url":"https://www.omim.org/entry/614719"},{"mim_id":"614206","title":"CHROMATIN TARGET OF PRMT1; CHTOP","url":"https://www.omim.org/entry/614206"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":24.5},{"tissue":"esophagus","ntpm":24.0}],"url":"https://www.proteinatlas.org/search/TGFA"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P01135","domains":[{"cath_id":"2.10.25.10","chopping":"41-85","consensus_level":"medium","plddt":75.9727,"start":41,"end":85},{"cath_id":"1.20.5","chopping":"87-136","consensus_level":"medium","plddt":72.9792,"start":87,"end":136}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P01135","model_url":"https://alphafold.ebi.ac.uk/files/AF-P01135-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P01135-F1-predicted_aligned_error_v6.png","plddt_mean":66.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TGFA","jax_strain_url":"https://www.jax.org/strain/search?query=TGFA"},"sequence":{"accession":"P01135","fasta_url":"https://rest.uniprot.org/uniprotkb/P01135.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P01135/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P01135"}},"corpus_meta":[{"pmid":"17785207","id":"PMC_17785207","title":"Concomitant 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axis.","date":"2017","source":"Die Pharmazie","url":"https://pubmed.ncbi.nlm.nih.gov/29441940","citation_count":8,"is_preprint":false},{"pmid":"28777012","id":"PMC_28777012","title":"Association of Common Variants in TGFA with Increased Risk of Knee Osteoarthritis Susceptibility.","date":"2017","source":"Genetic testing and molecular biomarkers","url":"https://pubmed.ncbi.nlm.nih.gov/28777012","citation_count":8,"is_preprint":false},{"pmid":"19196314","id":"PMC_19196314","title":"Transforming growth factor-alfa gene (TGFA), human tooth agenesis, and evidence of segmental uniparental isodisomy.","date":"2009","source":"European journal of oral sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19196314","citation_count":6,"is_preprint":false},{"pmid":"33200192","id":"PMC_33200192","title":"IRF6, MSX1, TGFA, dental anomalies, and skeletal malocclusion.","date":"2021","source":"European journal of orthodontics","url":"https://pubmed.ncbi.nlm.nih.gov/33200192","citation_count":4,"is_preprint":false},{"pmid":"32020849","id":"PMC_32020849","title":"Cisplatin inhibits the proliferation of Saos-2 osteosarcoma cells via the miR-376c/TGFA pathway.","date":"2021","source":"Bosnian journal of basic medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32020849","citation_count":4,"is_preprint":false},{"pmid":"36715959","id":"PMC_36715959","title":"Circ_0006667 contributes to high glucose-induced retinal pigment epithelial cell dysfunction by mediating miR-7-5p/TGFA axis in diabetic retinopathy.","date":"2023","source":"International ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/36715959","citation_count":4,"is_preprint":false},{"pmid":"35804263","id":"PMC_35804263","title":"CircRTN1 acts as a miR-431-5p sponge to promote thyroid cancer progression by upregulating TGFA.","date":"2022","source":"Hormones (Athens, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/35804263","citation_count":4,"is_preprint":false},{"pmid":"8272608","id":"PMC_8272608","title":"[Cleft lip and palate in the Chilean population: association with BamH1 polymorphism of the transforming growth factor alpha (TGFA) gene].","date":"1993","source":"Revista medica de Chile","url":"https://pubmed.ncbi.nlm.nih.gov/8272608","citation_count":4,"is_preprint":false},{"pmid":"30916164","id":"PMC_30916164","title":"Triiodothyronine (T3) upregulates the expression of proto-oncogene TGFA independent of MAPK/ERK pathway activation in the human breast adenocarcinoma cell line, MCF7.","date":"2019","source":"Archives of endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/30916164","citation_count":3,"is_preprint":false},{"pmid":"41267963","id":"PMC_41267963","title":"Integrative multi-omics analysis identifies TGFA as a novel glioma susceptibility gene and therapeutic target.","date":"2025","source":"Frontiers in 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carcinogenesis.\",\n      \"method\": \"Genetic epistasis / transgenic mouse model: Elastase-Tgfa mice crossed with p48(+/Cre);Kras(+/LSL-G12D) mice; histopathology and microarray analysis\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis in vivo with defined tumor phenotype and transcriptomic validation, single lab\",\n      \"pmids\": [\"17785207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TGFA is secreted by papillary thyroid carcinoma (PTC) cell lines into conditioned medium and activates EGFR on target cells, resulting in ERK and AKT phosphorylation; in NIM-1 PTC cells harboring BRAF mutation, TGFA stimulates proliferation and contributes to PI3K/AKT activation independently of MEK/ERK signaling.\",\n      \"method\": \"Biochemical analysis of PTC cell lines: detection of EGFR on cell membrane and TGFA in conditioned media; conditioned medium activation of EGFR on HeLa cells with ERK/AKT phosphorylation readout; proliferation assays with TGFA stimulation and pathway inhibitors\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal in vitro methods (conditioned media, receptor activation, kinase assays, proliferation), single lab\",\n      \"pmids\": [\"20877637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TGFα treatment of NPC CNE2 cells triggers EGFR-dependent tyrosine phosphorylation of ANXA3, KRT8, and KRT18, identifying these as novel downstream substrates of EGFR signaling activated by TGFA.\",\n      \"method\": \"Functional proteomics: 2-DE, 2-D western blotting, mass spectrometry, and IP-western blotting of TGFα-treated vs. control CNE2 cells\",\n      \"journal\": \"Medical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — IP-western validation of phosphoproteomics hits, single lab, single study\",\n      \"pmids\": [\"20049563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Triiodothyronine (T3) upregulates TGFA mRNA expression in MCF7 breast cancer cells via PI3K activation; this upregulation is dependent on active gene transcription (blocked by actinomycin D at early time points) but does not require MAPK/ERK pathway activation.\",\n      \"method\": \"RT-PCR in MCF7 cells treated with T3 in presence/absence of actinomycin D (transcription inhibitor), cycloheximide (translation inhibitor), and LY294002 (PI3K inhibitor)\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with multiple inhibitors, two orthogonal pathway inhibitors tested, single lab\",\n      \"pmids\": [\"27094789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"T3 at physiological concentration increases TGFA mRNA expression in MCF7 cells independently of MAPK/ERK pathway activation; inhibition of RNA polymerase II modulates this T3-induced TGFA expression, confirming transcriptional regulation.\",\n      \"method\": \"RT-PCR with α-amanitin (RNA Pol II inhibitor) and PD98059 (MAPK/ERK inhibitor) in T3-treated MCF7 cells\",\n      \"journal\": \"Archives of endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection replicating and extending prior finding from same group, two pathway inhibitors, single lab\",\n      \"pmids\": [\"30916164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-137 directly targets the 3' UTR of TGFA in non-small cell lung cancer cells; miR-137 overexpression reduces TGFA protein levels and suppresses NSCLC cell proliferation, while TGFA knockdown alone phenocopies this suppression.\",\n      \"method\": \"Dual-luciferase reporter assay (direct 3' UTR targeting), western blot (TGFA protein), MTT assay and flow cytometry (proliferation/cell cycle), qRT-PCR\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase validation of direct miRNA-target interaction plus functional rescue experiments, single lab\",\n      \"pmids\": [\"28239819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-374b directly targets and negatively regulates TGFA in breast cancer cells; TGFA contributes to malignant behavior (proliferation, invasion, colony formation, tumor growth), and overexpression of TGFA reverses the tumor-suppressive phenotypes caused by miR-374b overexpression.\",\n      \"method\": \"Bioinformatics target prediction, in vitro and in vivo functional assays (2D/3D proliferation, invasion, xenograft), rescue experiments with TGFA overexpression\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo xenograft plus in vitro rescue experiments, multiple orthogonal phenotypic readouts, single lab\",\n      \"pmids\": [\"33480984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"miR-376c directly targets the 3' UTR of TGFA; miR-376c overexpression suppresses TGFA expression and inhibits osteosarcoma Saos-2 cell growth and proliferation; cisplatin upregulates miR-376c and downregulates TGFA in a concentration-dependent manner, and TGFA overexpression reverses cisplatin-induced growth inhibition.\",\n      \"method\": \"Luciferase reporter assay (3' UTR direct targeting), TGFA-shRNA knockdown, TGFA ORF overexpression, MTT and BrdU proliferation assays, qRT-PCR, western blot\",\n      \"journal\": \"Bosnian journal of basic medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase validation of direct miRNA-TGFA interaction, gain- and loss-of-function with rescue, single lab\",\n      \"pmids\": [\"32020849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"IL-1β activates NF-κB signaling, which suppresses miR-376c expression, thereby relieving miR-376c-mediated repression of TGFA and promoting osteosarcoma cell growth; NF-κB knockdown suppresses TGFA expression and attenuates the TGFA increase induced by IL-1β.\",\n      \"method\": \"miR-376c/TGFA expression in OS tissues and cells; forced miR-376c expression; NF-κB knockdown; western blot for NF-κB and TGFA protein levels\",\n      \"journal\": \"Die Pharmazie\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway inference from single lab using western blot and overexpression without full mechanistic reconstitution\",\n      \"pmids\": [\"29441940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"miR-7-5p directly targets TGFA 3' UTR; circ_0006667 sponges miR-7-5p, thereby upregulating TGFA expression in retinal pigment epithelial cells under high-glucose conditions; miR-7-5p overexpression protects cells from high-glucose-induced dysfunction largely by downregulating TGFA.\",\n      \"method\": \"Dual-luciferase reporter and RNA immunoprecipitation (RIP) assays, RT-qPCR, western blot, MTT, EdU, flow cytometry\",\n      \"journal\": \"International ophthalmology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, luciferase plus RIP for target validation, but limited independent replication\",\n      \"pmids\": [\"36715959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IRF6 and TGFA genetically interact in the etiology of cleft lip/palate; Tgfa is not expressed in palatal tissues of Irf6 knockout mice, placing IRF6 upstream of TGFA in palatogenesis.\",\n      \"method\": \"Statistical gene-gene interaction analyses in multiple human cohorts; expression analysis of Tgfa and Irf6 in wild-type vs. Irf6 knockout mouse palatal tissues at critical stages of palatogenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis confirmed in mouse KO model plus replicated interaction in four independent human cohorts\",\n      \"pmids\": [\"23029012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TGFA binds to DSG2 (desmoglein 2) and activates downstream c-MYC/ADAM17 pathway, promoting cervical cancer cell proliferation, metastasis, and autophagy; TGFA knockdown inhibits tumor growth in vivo.\",\n      \"method\": \"RNA pull-down assay (TGFA-DSG2 interaction), western blot, MTT, flow cytometry, Transwell assay, nude mouse xenograft; RT-qPCR\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RNA pull-down for protein interaction, single lab, limited orthogonal validation of the TGFA-DSG2 binding\",\n      \"pmids\": [\"42154444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In mouse extrahepatic bile duct, Tgfa is expressed in cholangiocytes at homeostasis and its levels increase after bile duct obstruction along with Egfr upregulation; EGFR activation (to which Tgfa contributes as a ligand) drives cholangiocyte proliferation and bile duct regeneration after injury.\",\n      \"method\": \"Transcriptomic and immunohistochemistry analyses of mouse EHBD at homeostasis and after bile duct ligation; biliary organoid assays with recombinant EGFR ligands and EGFR/ERBB2 inhibitors; in vivo EGFR inhibition after obstruction\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, Tgfa identified as one of several ligands without specific Tgfa loss-of-function experiment\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"TGFA encodes a ligand for EGFR that acts in autocrine/paracrine signaling loops: it is transcriptionally regulated downstream of IRF6 during palatogenesis and downstream of T3/PI3K (but not MAPK/ERK) in breast cancer cells; it activates EGFR to trigger ERK and AKT phosphorylation, driving proliferation in multiple cancer contexts (pancreatic, thyroid, lung, breast, osteosarcoma, cervical), and it is post-transcriptionally repressed by several miRNAs (miR-137, miR-374b, miR-376c, miR-7-5p); in pancreatic tissue, TGFα synergizes with oncogenic Kras(G12D) through EGFR to promote IPMN and pancreatic cancer progression, and in cervical cancer it binds DSG2 to activate a c-MYC/ADAM17 downstream pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TGFA encodes a secreted ligand for the EGF receptor (EGFR) that drives autocrine and paracrine proliferative signaling across multiple epithelial and cancer contexts [#1]. Secreted TGFα activates EGFR on target cells, triggering downstream ERK and AKT phosphorylation; in BRAF-mutant papillary thyroid carcinoma cells this stimulates proliferation via PI3K/AKT independently of MEK/ERK [#1], and in nasopharyngeal carcinoma cells TGFα-activated EGFR drives tyrosine phosphorylation of substrates including ANXA3, KRT8, and KRT18 [#2]. TGFA expression is controlled at multiple levels: transcriptionally, T3 induces TGFA in breast cancer cells through PI3K and RNA polymerase II-dependent transcription but not MAPK/ERK [#3, #4], and IRF6 acts upstream of Tgfa during palatogenesis, where the two genes genetically interact in cleft lip/palate etiology [#10]; post-transcriptionally, several miRNAs (miR-137, miR-374b, miR-376c) directly target the TGFA 3' UTR to repress its expression and suppress proliferation in lung, breast, and osteosarcoma cells, with TGFA re-expression rescuing the malignant phenotype [#5, #6, #7]. In pancreatic tissue, TGFα synergizes with oncogenic Kras(G12D) through EGFR to accelerate progression to metastatic cancer and IPMN-like lesions [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that TGFα-driven EGFR signaling cooperates with oncogenic Kras to promote pancreatic carcinogenesis, defining a genetic synergy in tumor progression.\",\n      \"evidence\": \"Transgenic mouse genetic epistasis crossing Elastase-Tgfa with p48-Cre;Kras-G12D mice, with histopathology and microarray\",\n      \"pmids\": [\"17785207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not resolve which EGFR-downstream effectors mediate the synergy\", \"No TGFα loss-of-function to test necessity\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that TGFα is secreted and activates EGFR on recipient cells to drive ERK/AKT phosphorylation and proliferation, with PI3K/AKT contribution independent of MEK/ERK in thyroid carcinoma.\",\n      \"evidence\": \"Conditioned-medium EGFR activation assays, kinase readouts, and proliferation assays with pathway inhibitors in PTC cell lines\",\n      \"pmids\": [\"20877637\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, in vitro only\", \"Relative contributions of ERK vs AKT to proliferation not fully quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified concrete EGFR substrates downstream of TGFα stimulation, linking ligand activity to specific phosphorylation events.\",\n      \"evidence\": \"Phosphoproteomics (2-DE, MS) with IP-western validation in TGFα-treated CNE2 nasopharyngeal carcinoma cells\",\n      \"pmids\": [\"20049563\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of ANXA3/KRT8/KRT18 phosphorylation unknown\", \"Single study\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed IRF6 upstream of TGFA in palatogenesis, providing a developmental transcriptional context and disease relevance for TGFA in cleft lip/palate.\",\n      \"evidence\": \"Gene-gene interaction analysis across human cohorts plus Tgfa expression analysis in Irf6 knockout mouse palatal tissue\",\n      \"pmids\": [\"23029012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional regulation of TGFA by IRF6 not demonstrated\", \"Mechanism connecting TGFA loss to clefting unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined miRNA-mediated post-transcriptional repression of TGFA as a tumor-suppressive axis, with direct 3' UTR targeting and functional rescue.\",\n      \"evidence\": \"Dual-luciferase reporter, western blot, and proliferation/rescue assays for miR-137 (NSCLC), later extended to miR-374b (breast) and miR-376c (osteosarcoma)\",\n      \"pmids\": [\"28239819\", \"33480984\", \"32020849\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which miRNA dominates in a given tissue is unclear\", \"EGFR pathway engagement downstream of TGFA in these rescue settings not directly measured\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated hormone-driven transcriptional induction of TGFA, showing T3 upregulates TGFA via PI3K and RNA Pol II-dependent transcription, not MAPK/ERK.\",\n      \"evidence\": \"RT-PCR with actinomycin D, cycloheximide, LY294002, α-amanitin, and PD98059 in T3-treated MCF7 cells (two studies)\",\n      \"pmids\": [\"27094789\", \"30916164\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcription factor mediating T3/PI3K induction of TGFA not identified\", \"Single group\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked inflammatory signaling to TGFA control, showing IL-1β/NF-κB suppresses miR-376c to relieve TGFA repression.\",\n      \"evidence\": \"NF-κB knockdown, forced miR-376c expression, and western blot in osteosarcoma cells/tissues\",\n      \"pmids\": [\"29441940\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Pathway inferred without full mechanistic reconstitution\", \"Direct NF-κB regulation of the miR-376c locus not shown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended TGFA regulation to a circRNA-miRNA-TGFA axis in a non-cancer context (retinal pigment epithelium under high glucose).\",\n      \"evidence\": \"Dual-luciferase and RIP assays, with miR-7-5p/circ_0006667 manipulation in RPE cells\",\n      \"pmids\": [\"36715959\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single lab, limited independent replication\", \"TGFA effector mechanism in RPE dysfunction not detailed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed a non-EGFR partner for TGFA, reporting TGFA-DSG2 binding driving a c-MYC/ADAM17 pathway in cervical cancer.\",\n      \"evidence\": \"RNA pull-down for TGFA-DSG2 interaction plus phenotypic and xenograft assays\",\n      \"pmids\": [\"42154444\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"RNA pull-down for a protein-protein interaction is unconventional and lacks orthogonal binding validation\", \"Relationship between DSG2 axis and canonical EGFR signaling unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated Tgfa as one of several EGFR ligands in cholangiocyte proliferation and bile duct regeneration after injury.\",\n      \"evidence\": \"Transcriptomics, IHC, and biliary organoid assays with EGFR ligands/inhibitors after bile duct ligation in mouse (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint without Tgfa-specific loss-of-function\", \"Tgfa contribution not separated from other EGFR ligands\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TGFA processing, secretion, and ligand availability are coordinated with its multiple transcriptional and post-transcriptional inputs across tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural or biophysical characterization of TGFα-EGFR binding in the corpus\", \"Whether non-EGFR partners such as DSG2 are physiologically relevant is unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [1, 2, 0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"EGFR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}