{"gene":"FAT1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2018,"finding":"FAT1 loss activates the Hippo pathway, leading to accumulation of YAP and TAZ transcription factors on the CDK6 promoter, resulting in elevated CDK6 expression and resistance to CDK4/6 inhibitors in ER+ breast cancer.","method":"Genomic analysis of patient tumors, knockdown/loss-of-function experiments, ChIP showing YAP/TAZ binding to CDK6 promoter","journal":"Cancer Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genomics, functional KO, ChIP), moderate-to-strong evidence","pmids":["30537512"],"is_preprint":false},{"year":2020,"finding":"Loss of function of FAT1 activates a CAMK2-CD44-SRC axis that promotes YAP1 nuclear translocation and ZEB1 expression (mesenchymal state), and inactivates EZH2, promoting SOX2 expression (epithelial state), together inducing a hybrid EMT state with increased tumour stemness and metastasis.","method":"Mouse genetic models (Fat1 deletion), transcriptional/chromatin profiling, proteomics, mechanistic epistasis studies in skin SCC and lung tumour models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — multi-omic mechanistic dissection in vivo and in vitro, replicated in mouse and human tumours","pmids":["33328637"],"is_preprint":false},{"year":2018,"finding":"FAT1 assembles a multimeric Hippo signaling complex (signalome) by scaffolding TAOKs and core Hippo kinases, leading to activation of LATS1/2 and consequent YAP1 phosphorylation and inactivation; FAT1 functional loss in HNSCC results in unrestrained YAP1 oncogenic activity.","method":"Co-immunoprecipitation, kinase activity assays, pancancer genomic analysis, FAT1 loss-of-function in HNSCC cell lines","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, functional epistasis, multiple orthogonal methods in a single study","pmids":["29985391"],"is_preprint":false},{"year":2006,"finding":"FAT1 intracellular domain (Fat1-IC) interacts with β-catenin, inhibiting its nuclear localization and transcriptional activity; FAT1 undergoes proteolytic cleavage releasing the IC domain; FAT1 knockdown decreases VSMC migration while enhancing cyclin D1 expression and proliferation.","method":"Co-immunoprecipitation, nuclear fractionation, knockdown experiments in vascular smooth muscle cells, luciferase transcription assays","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus nuclear fractionation plus functional knockdown phenotypes","pmids":["16682528"],"is_preprint":false},{"year":2016,"finding":"FAT1 intracellular domain fragments accumulate in mitochondria and interact with multiple mitochondrial inner membrane proteins; FAT1 acts as a molecular brake on mitochondrial respiration (complexes I and II), suppressing supercomplex formation, ATP production, and aspartate synthesis, thereby restraining vascular smooth muscle cell proliferation after arterial injury.","method":"Subcellular fractionation, Co-IP with mitochondrial proteins, oxygen consumption assays, complex activity assays, Fat1KO mouse model with vascular injury, mitochondria-targeted FAT1-IC rescue construct","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution-like rescue with targeted construct, multiple orthogonal biochemical and in vivo methods","pmids":["27828948"],"is_preprint":false},{"year":2014,"finding":"FAT1 interacts with caspase-8 and prevents caspase-8 association with the death-inducing signaling complex (DISC), thereby antagonizing extrinsic apoptosis; FAT1 knockdown or CRISPR knockout sensitizes glioblastoma cells to death receptor-mediated apoptosis.","method":"Genome-wide siRNA synthetic lethality screen, Co-IP, DISC immunoprecipitation, CRISPR/Cas9 knockout, cell death assays","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 — genome-wide screen + reciprocal Co-IP + CRISPR KO with defined phenotype","pmids":["24442637"],"is_preprint":false},{"year":2023,"finding":"Endothelial FAT1 interacts with the E3 ubiquitin ligase Mind Bomb-2 (MIB2), which mediates FAT1-induced ubiquitination and proteasomal degradation of YAP/TAZ, thereby limiting YAP/TAZ transcriptional activity and restraining angiogenesis; loss of FAT1 or MIB2 increases YAP/TAZ protein levels and endothelial cell proliferation.","method":"Co-immunoprecipitation identifying MIB2 as FAT1-interacting partner, ubiquitination assays, endothelial-specific FAT1 and MIB2 knockout in vitro and in vivo angiogenesis models","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 — Co-IP identifying E3 ligase partner, ubiquitination assays, in vivo genetic models","pmids":["37031213"],"is_preprint":false},{"year":2011,"finding":"Human FAT1 undergoes constitutive proteolytic cleavage by the proprotein convertase furin to form a non-covalent heterodimer at the cell surface; in melanoma cells an additional furin-independent processing generates a persistent 65-kDa membrane-bound cytoplasmic fragment; uncleaved FAT1 proform is also expressed at the cell surface in melanoma cells.","method":"Northern blotting, Western blotting with furin inhibitors, subcellular fractionation, immunofluorescence localization in keratinocytes and melanoma cells","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — pharmacologic inhibition of specific protease plus biochemical fractionation demonstrating distinct processing products","pmids":["21680732"],"is_preprint":false},{"year":2005,"finding":"The cytoplasmic domain of human FAT1 is released from the membrane by proteolytic processing (first cleavage removes extracellular domain; second cleavage releases IC domain to cytosol) and translocates to the nucleus via a juxtamembrane nuclear localization signal.","method":"Expression of EGFP-fusion constructs in HEK293/HeLa cells, subcellular fractionation, deletion mutant analysis","journal":"Experimental Cell Research","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiments with deletion mutants identifying NLS; single lab","pmids":["15922730"],"is_preprint":false},{"year":2017,"finding":"FAT1 prevents epithelial-mesenchymal transition in esophageal squamous cell carcinoma through the MAPK/ERK signaling pathway; FAT1 knockdown decreases E-cadherin and increases N-cadherin, vimentin, and Snail in a MEK-dependent manner, abrogated by the MEK inhibitor U0126.","method":"Exogenous FAT1 expression and siRNA knockdown, Western blotting for EMT markers, MEK inhibitor rescue experiments, in vitro and in vivo functional assays","journal":"Cancer Letters","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacologic epistasis (MEK inhibitor rescue) plus KD/OE with defined molecular phenotype; single lab","pmids":["28366557"],"is_preprint":false},{"year":2019,"finding":"FAT1 inhibits β-catenin-mediated transcription in cervical cancer cells through direct interaction with β-catenin; FAT1 overexpression promotes β-catenin phosphorylation and reduces expression of c-MYC, TCF-4, and MMP14, while FAT1 knockdown promotes EMT; β-catenin overexpression partially rescues FAT1-mediated growth suppression.","method":"Co-immunoprecipitation of endogenous and exogenous FAT1 with β-catenin, Western blot for phospho-β-catenin and EMT markers, rescue experiments","journal":"International Journal of Clinical and Experimental Pathology","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus rescue experiments, single lab","pmids":["31933769"],"is_preprint":false},{"year":2022,"finding":"FAT1 knockdown in glioblastoma and other cancer cell lines decreases TGF-β1/2 expression and secretion; in U87MG cells decreased TGF-β1 upon FAT1 knockdown is mediated by miR-663a; FAT1 promotes an immunosuppressive tumor microenvironment via TGF-β.","method":"siRNA knockdown, qPCR, Western blot, ELISA for TGF-β1/2 secretion, THP-1 chemotaxis assay, miRNA inhibitor experiments","journal":"Frontiers in Immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 — loss-of-function with multiple readouts plus miRNA epistasis; single lab","pmids":["35720420"],"is_preprint":false},{"year":2016,"finding":"FAT1 acts as a novel upstream regulator of HIF-1α in glioblastoma; FAT1 depletion under hypoxia reduces HIF-1α and its target genes via compromised EGFR-Akt signaling and increased VHL-dependent proteasomal degradation of HIF-1α, and significantly reduces GBM cell invasiveness.","method":"siRNA knockdown under hypoxic conditions, Western blot for EGFR/Akt signaling and VHL pathway, invasion assays","journal":"International Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 — pathway epistasis via pharmacologic and genetic dissection, single lab","pmids":["27536856"],"is_preprint":false},{"year":2022,"finding":"FAT1 is identified as a target antigen in hematopoietic stem cell transplant-associated membranous nephropathy; anti-FAT1 IgG and IgG4 autoantibodies are detected in patient serum and eluted from kidney biopsies, with FAT1 deposits localized along the glomerular basement membrane.","method":"Laser microdissection and tandem mass spectrometry (MS/MS) of glomeruli, IHC/IF localization, Western blot of eluates and patient serum","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 — MS/MS antigen discovery validated by Western blot with patient IgG and IF localization, confirmed in two independent cohorts","pmids":["35321939"],"is_preprint":false},{"year":2021,"finding":"FAT1 (as glypican-3 interacting protein in HCC) is identified as binding GPC3 through its C-terminal EGF-like domains (residues 4013-4181); fine domain mapping by ELISA and flow cytometry defined the specific binding site; FAT1 and GPC3 co-regulate EMT-related genes and promote HCC cell migration.","method":"Co-immunoprecipitation, ELISA domain-mapping, flow cytometry, migration assays, EMT marker analysis","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — domain mapping by ELISA/flow cytometry plus functional co-regulation; single lab","pmids":["33420124"],"is_preprint":false},{"year":2022,"finding":"FAT1 knockdown in esophageal squamous cell carcinoma cells induces nuclear translocation of β-catenin, enhances its transcriptional activity, and upregulates ABCC3 (drug efflux transporter) via β-catenin binding to the ABCC3 promoter, conferring cisplatin resistance and increased stemness.","method":"siRNA knockdown, nuclear fractionation, ChIP showing β-catenin enrichment on ABCC3 promoter, luciferase transcription assays, sphere-forming and drug efflux assays","journal":"Molecular and Cellular Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus nuclear fractionation plus functional drug resistance phenotype; single lab","pmids":["35606602"],"is_preprint":false}],"current_model":"FAT1 is a giant atypical protocadherin that functions as a tumor suppressor and signaling scaffold: it assembles a Hippo signaling complex (via TAOKs) to activate LATS kinases and suppress YAP1/TAZ nuclear activity, undergoes constitutive furin-mediated proteolytic processing to form a surface heterodimer with its intracellular domain capable of nuclear translocation, acts as a molecular brake on mitochondrial respiratory complex activity to restrain cell proliferation, sequesters β-catenin to inhibit its nuclear transcriptional activity, interacts with caspase-8 to suppress death-receptor-mediated apoptosis, and in endothelial cells recruits the E3 ubiquitin ligase MIB2 to promote YAP/TAZ ubiquitination and degradation, thereby limiting angiogenesis."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing that FAT1 undergoes regulated intramembrane proteolysis answered how a giant transmembrane cadherin could signal intracellularly: sequential cleavages release a cytoplasmic domain that translocates to the nucleus via a juxtamembrane NLS.","evidence":"EGFP-fusion constructs and deletion mutants in HEK293/HeLa cells with subcellular fractionation","pmids":["15922730"],"confidence":"Medium","gaps":["Identity of the second (intramembrane) protease unresolved","Nuclear function of the released IC domain not determined","Single-lab observation"]},{"year":2006,"claim":"Identifying β-catenin as a direct binding partner of the FAT1 intracellular domain established FAT1 as a negative regulator of Wnt signaling, explaining how FAT1 loss increases cyclin D1 expression and proliferation.","evidence":"Co-immunoprecipitation, nuclear fractionation, and knockdown in vascular smooth muscle cells with luciferase transcription assays","pmids":["16682528"],"confidence":"High","gaps":["Stoichiometry and affinity of FAT1-IC/β-catenin interaction unknown","Whether β-catenin sequestration is the dominant anti-proliferative mechanism in vivo unclear"]},{"year":2011,"claim":"Demonstrating that furin is the proprotein convertase constitutively cleaving FAT1 at the cell surface resolved the protease identity for the first processing step and revealed aberrant processing in melanoma.","evidence":"Furin inhibitor treatment, Western blotting, and subcellular fractionation in keratinocytes and melanoma cells","pmids":["21680732"],"confidence":"High","gaps":["Functional significance of melanoma-specific 65-kDa fragment uncharacterized","Furin cleavage site not mapped at residue resolution"]},{"year":2014,"claim":"Discovery that FAT1 physically sequesters caspase-8 away from the DISC revealed an unexpected anti-apoptotic role, explaining why FAT1 loss sensitizes glioblastoma cells to death-receptor-induced apoptosis.","evidence":"Genome-wide siRNA screen, reciprocal Co-IP, DISC immunoprecipitation, and CRISPR knockout in glioblastoma cells","pmids":["24442637"],"confidence":"High","gaps":["Structural basis of FAT1–caspase-8 interaction unknown","Whether this anti-apoptotic function operates in non-cancer cell types not tested"]},{"year":2016,"claim":"Localization of FAT1-IC fragments to mitochondria and their direct suppression of respiratory complexes I and II established FAT1 as a metabolic brake, linking it to control of proliferation via ATP and aspartate biosynthesis.","evidence":"Subcellular fractionation, Co-IP with mitochondrial inner membrane proteins, oximetry, complex activity assays, and Fat1 KO mouse vascular injury model with mitochondria-targeted rescue","pmids":["27828948"],"confidence":"High","gaps":["Mechanism by which FAT1-IC inhibits supercomplex assembly not structurally resolved","Generality beyond vascular smooth muscle cells not fully explored"]},{"year":2018,"claim":"Identification of FAT1 as a scaffold assembling TAOKs and core Hippo kinases into a signalome complex that activates LATS1/2 to phosphorylate YAP1 provided the first direct biochemical link between FAT1 and the Hippo pathway, explaining the tumor-suppressive phenotype of FAT1 loss across cancers.","evidence":"Reciprocal Co-IP, kinase activity assays, pan-cancer genomics, and FAT1 loss-of-function in HNSCC cell lines","pmids":["29985391","30537512"],"confidence":"High","gaps":["Precise binding interfaces between FAT1-IC and TAOK/LATS not mapped","Whether FAT1 scaffolding is regulated by upstream signals unknown"]},{"year":2020,"claim":"Genetic deletion of Fat1 in mouse skin and lung tumors revealed a CAMK2–CD44–SRC axis driving YAP1 nuclear entry and a parallel EZH2-inactivation/SOX2-upregulation circuit, establishing that FAT1 loss induces a hybrid EMT state with enhanced stemness and metastasis.","evidence":"Fat1 conditional KO mice, multi-omic transcriptional/chromatin/proteomic profiling, and mechanistic epistasis in SCC and lung tumor models","pmids":["33328637"],"confidence":"High","gaps":["Whether CAMK2 activation is a direct or indirect consequence of FAT1 loss not resolved","Relative contribution of YAP1 vs. SOX2 arm to metastasis not fully dissected"]},{"year":2022,"claim":"ChIP showing β-catenin binding the ABCC3 promoter upon FAT1 knockdown linked β-catenin de-repression to cisplatin resistance and stemness in esophageal SCC, providing a clinically relevant downstream effector of FAT1-mediated β-catenin control.","evidence":"siRNA knockdown, nuclear fractionation, ChIP, luciferase assays, and drug efflux/sphere-forming assays in ESCC cells","pmids":["35606602"],"confidence":"Medium","gaps":["Single-lab finding in one cancer type","Whether ABCC3 is sufficient or necessary for chemoresistance upon FAT1 loss not genetically tested"]},{"year":2022,"claim":"Identification of FAT1 as a target antigen in hematopoietic stem cell transplant-associated membranous nephropathy revealed a disease-relevant autoimmune context for FAT1, with anti-FAT1 IgG4 deposited along glomerular basement membranes.","evidence":"Laser microdissection/MS of glomeruli, IHC/IF, and Western blot of eluates and serum in two independent patient cohorts","pmids":["35321939"],"confidence":"High","gaps":["Whether anti-FAT1 antibodies are pathogenic or epiphenomenal not demonstrated","Epitope(s) on FAT1 recognized by autoantibodies not mapped"]},{"year":2023,"claim":"Discovery that FAT1 recruits the E3 ligase MIB2 to ubiquitinate YAP/TAZ for proteasomal degradation in endothelial cells provided a Hippo-kinase-independent mechanism of YAP/TAZ suppression and linked FAT1 to angiogenesis control.","evidence":"Co-IP identifying MIB2, ubiquitination assays, endothelial-specific FAT1 and MIB2 KO in vitro and in vivo angiogenesis models","pmids":["37031213"],"confidence":"High","gaps":["Whether MIB2-mediated degradation operates concurrently with LATS-dependent phosphorylation not addressed","Structural basis of FAT1–MIB2 interaction unknown"]},{"year":null,"claim":"A unified structural and quantitative model integrating FAT1's simultaneous roles as Hippo scaffold, β-catenin sequestrant, mitochondrial brake, caspase-8 inhibitor, and MIB2 recruiter — and how these activities are partitioned across its proteolytic fragments and cell types — remains to be established.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of FAT1 intracellular domain or its complexes","How FAT1-IC is partitioned among mitochondrial, nuclear, and cytoplasmic pools is not quantified","Whether different proteolytic fragments mediate distinct signaling arms has not been tested with separation-of-function mutants"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,5,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,3,4,5,6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,7,8]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[4]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,3,6,9,10,15]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4]}],"complexes":["Hippo signalome (TAOK-MST-LATS scaffold)"],"partners":["CTNNB1","TAOK1","LATS1","CASP8","MIB2","YAP1","GPC3"],"other_free_text":[]},"mechanistic_narrative":"FAT1 is a giant atypical protocadherin that functions as a multifunctional tumor suppressor and signaling scaffold, restraining cell proliferation, EMT, and angiogenesis through convergent regulation of the Hippo, Wnt/β-catenin, and MAPK pathways. FAT1 assembles a Hippo signaling complex by scaffolding TAOK kinases to activate LATS1/2, thereby phosphorylating and inactivating YAP1/TAZ; in endothelial cells it additionally recruits the E3 ubiquitin ligase MIB2 to ubiquitinate and degrade YAP/TAZ, limiting angiogenesis [PMID:29985391, PMID:37031213, PMID:30537512]. Its intracellular domain, released by constitutive furin-mediated proteolytic processing, sequesters β-catenin from the nucleus to suppress Wnt target gene transcription, localizes to mitochondria where it restrains respiratory complex I/II activity and ATP production, and interacts with caspase-8 to prevent DISC assembly and death-receptor-mediated apoptosis [PMID:16682528, PMID:27828948, PMID:24442637, PMID:21680732]. Loss of FAT1 activates a CAMK2–CD44–SRC axis driving YAP1 nuclear translocation and a hybrid EMT state with enhanced tumor stemness and metastasis [PMID:33328637]."},"prefetch_data":{"uniprot":{"accession":"Q14517","full_name":"Protocadherin Fat 1","aliases":["Cadherin family member 7","Cadherin-related tumor suppressor homolog","Protein fat homolog"],"length_aa":4588,"mass_kda":506.3,"function":"Plays an essential role for cellular polarization, directed cell migration and modulating cell-cell contact","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q14517/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FAT1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FAT1","total_profiled":1310},"omim":[{"mim_id":"618642","title":"SH3 DOMAIN-CONTAINING RING FINGER PROTEIN 1; SH3RF1","url":"https://www.omim.org/entry/618642"},{"mim_id":"612483","title":"FAT ATYPICAL CADHERIN 3; FAT3","url":"https://www.omim.org/entry/612483"},{"mim_id":"612411","title":"FAT ATYPICAL CADHERIN 4; FAT4","url":"https://www.omim.org/entry/612411"},{"mim_id":"604269","title":"FAT ATYPICAL CADHERIN 2; FAT2","url":"https://www.omim.org/entry/604269"},{"mim_id":"600976","title":"FAT ATYPICAL CADHERIN 1; FAT1","url":"https://www.omim.org/entry/600976"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":81.8}],"url":"https://www.proteinatlas.org/search/FAT1"},"hgnc":{"alias_symbol":["CDHF7","CDHR8"],"prev_symbol":["FAT"]},"alphafold":{"accession":"Q14517","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14517","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FAT1","jax_strain_url":"https://www.jax.org/strain/search?query=FAT1"},"sequence":{"accession":"Q14517","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14517.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14517/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14517"}},"corpus_meta":[{"pmid":"30537512","id":"PMC_30537512","title":"Loss of the FAT1 Tumor Suppressor Promotes Resistance to CDK4/6 Inhibitors via the Hippo Pathway.","date":"2018","source":"Cancer 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\"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genomics, functional KO, ChIP), moderate-to-strong evidence\",\n      \"pmids\": [\"30537512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of function of FAT1 activates a CAMK2-CD44-SRC axis that promotes YAP1 nuclear translocation and ZEB1 expression (mesenchymal state), and inactivates EZH2, promoting SOX2 expression (epithelial state), together inducing a hybrid EMT state with increased tumour stemness and metastasis.\",\n      \"method\": \"Mouse genetic models (Fat1 deletion), transcriptional/chromatin profiling, proteomics, mechanistic epistasis studies in skin SCC and lung tumour models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multi-omic mechanistic dissection in vivo and in vitro, replicated in mouse and human tumours\",\n      \"pmids\": [\"33328637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FAT1 assembles a multimeric Hippo signaling complex (signalome) by scaffolding TAOKs and core Hippo kinases, leading to activation of LATS1/2 and consequent YAP1 phosphorylation and inactivation; FAT1 functional loss in HNSCC results in unrestrained YAP1 oncogenic activity.\",\n      \"method\": \"Co-immunoprecipitation, kinase activity assays, pancancer genomic analysis, FAT1 loss-of-function in HNSCC cell lines\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, functional epistasis, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"29985391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FAT1 intracellular domain (Fat1-IC) interacts with β-catenin, inhibiting its nuclear localization and transcriptional activity; FAT1 undergoes proteolytic cleavage releasing the IC domain; FAT1 knockdown decreases VSMC migration while enhancing cyclin D1 expression and proliferation.\",\n      \"method\": \"Co-immunoprecipitation, nuclear fractionation, knockdown experiments in vascular smooth muscle cells, luciferase transcription assays\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus nuclear fractionation plus functional knockdown phenotypes\",\n      \"pmids\": [\"16682528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FAT1 intracellular domain fragments accumulate in mitochondria and interact with multiple mitochondrial inner membrane proteins; FAT1 acts as a molecular brake on mitochondrial respiration (complexes I and II), suppressing supercomplex formation, ATP production, and aspartate synthesis, thereby restraining vascular smooth muscle cell proliferation after arterial injury.\",\n      \"method\": \"Subcellular fractionation, Co-IP with mitochondrial proteins, oxygen consumption assays, complex activity assays, Fat1KO mouse model with vascular injury, mitochondria-targeted FAT1-IC rescue construct\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution-like rescue with targeted construct, multiple orthogonal biochemical and in vivo methods\",\n      \"pmids\": [\"27828948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FAT1 interacts with caspase-8 and prevents caspase-8 association with the death-inducing signaling complex (DISC), thereby antagonizing extrinsic apoptosis; FAT1 knockdown or CRISPR knockout sensitizes glioblastoma cells to death receptor-mediated apoptosis.\",\n      \"method\": \"Genome-wide siRNA synthetic lethality screen, Co-IP, DISC immunoprecipitation, CRISPR/Cas9 knockout, cell death assays\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen + reciprocal Co-IP + CRISPR KO with defined phenotype\",\n      \"pmids\": [\"24442637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Endothelial FAT1 interacts with the E3 ubiquitin ligase Mind Bomb-2 (MIB2), which mediates FAT1-induced ubiquitination and proteasomal degradation of YAP/TAZ, thereby limiting YAP/TAZ transcriptional activity and restraining angiogenesis; loss of FAT1 or MIB2 increases YAP/TAZ protein levels and endothelial cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation identifying MIB2 as FAT1-interacting partner, ubiquitination assays, endothelial-specific FAT1 and MIB2 knockout in vitro and in vivo angiogenesis models\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifying E3 ligase partner, ubiquitination assays, in vivo genetic models\",\n      \"pmids\": [\"37031213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human FAT1 undergoes constitutive proteolytic cleavage by the proprotein convertase furin to form a non-covalent heterodimer at the cell surface; in melanoma cells an additional furin-independent processing generates a persistent 65-kDa membrane-bound cytoplasmic fragment; uncleaved FAT1 proform is also expressed at the cell surface in melanoma cells.\",\n      \"method\": \"Northern blotting, Western blotting with furin inhibitors, subcellular fractionation, immunofluorescence localization in keratinocytes and melanoma cells\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — pharmacologic inhibition of specific protease plus biochemical fractionation demonstrating distinct processing products\",\n      \"pmids\": [\"21680732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The cytoplasmic domain of human FAT1 is released from the membrane by proteolytic processing (first cleavage removes extracellular domain; second cleavage releases IC domain to cytosol) and translocates to the nucleus via a juxtamembrane nuclear localization signal.\",\n      \"method\": \"Expression of EGFP-fusion constructs in HEK293/HeLa cells, subcellular fractionation, deletion mutant analysis\",\n      \"journal\": \"Experimental Cell Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with deletion mutants identifying NLS; single lab\",\n      \"pmids\": [\"15922730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FAT1 prevents epithelial-mesenchymal transition in esophageal squamous cell carcinoma through the MAPK/ERK signaling pathway; FAT1 knockdown decreases E-cadherin and increases N-cadherin, vimentin, and Snail in a MEK-dependent manner, abrogated by the MEK inhibitor U0126.\",\n      \"method\": \"Exogenous FAT1 expression and siRNA knockdown, Western blotting for EMT markers, MEK inhibitor rescue experiments, in vitro and in vivo functional assays\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacologic epistasis (MEK inhibitor rescue) plus KD/OE with defined molecular phenotype; single lab\",\n      \"pmids\": [\"28366557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FAT1 inhibits β-catenin-mediated transcription in cervical cancer cells through direct interaction with β-catenin; FAT1 overexpression promotes β-catenin phosphorylation and reduces expression of c-MYC, TCF-4, and MMP14, while FAT1 knockdown promotes EMT; β-catenin overexpression partially rescues FAT1-mediated growth suppression.\",\n      \"method\": \"Co-immunoprecipitation of endogenous and exogenous FAT1 with β-catenin, Western blot for phospho-β-catenin and EMT markers, rescue experiments\",\n      \"journal\": \"International Journal of Clinical and Experimental Pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus rescue experiments, single lab\",\n      \"pmids\": [\"31933769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FAT1 knockdown in glioblastoma and other cancer cell lines decreases TGF-β1/2 expression and secretion; in U87MG cells decreased TGF-β1 upon FAT1 knockdown is mediated by miR-663a; FAT1 promotes an immunosuppressive tumor microenvironment via TGF-β.\",\n      \"method\": \"siRNA knockdown, qPCR, Western blot, ELISA for TGF-β1/2 secretion, THP-1 chemotaxis assay, miRNA inhibitor experiments\",\n      \"journal\": \"Frontiers in Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — loss-of-function with multiple readouts plus miRNA epistasis; single lab\",\n      \"pmids\": [\"35720420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FAT1 acts as a novel upstream regulator of HIF-1α in glioblastoma; FAT1 depletion under hypoxia reduces HIF-1α and its target genes via compromised EGFR-Akt signaling and increased VHL-dependent proteasomal degradation of HIF-1α, and significantly reduces GBM cell invasiveness.\",\n      \"method\": \"siRNA knockdown under hypoxic conditions, Western blot for EGFR/Akt signaling and VHL pathway, invasion assays\",\n      \"journal\": \"International Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pathway epistasis via pharmacologic and genetic dissection, single lab\",\n      \"pmids\": [\"27536856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FAT1 is identified as a target antigen in hematopoietic stem cell transplant-associated membranous nephropathy; anti-FAT1 IgG and IgG4 autoantibodies are detected in patient serum and eluted from kidney biopsies, with FAT1 deposits localized along the glomerular basement membrane.\",\n      \"method\": \"Laser microdissection and tandem mass spectrometry (MS/MS) of glomeruli, IHC/IF localization, Western blot of eluates and patient serum\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS/MS antigen discovery validated by Western blot with patient IgG and IF localization, confirmed in two independent cohorts\",\n      \"pmids\": [\"35321939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FAT1 (as glypican-3 interacting protein in HCC) is identified as binding GPC3 through its C-terminal EGF-like domains (residues 4013-4181); fine domain mapping by ELISA and flow cytometry defined the specific binding site; FAT1 and GPC3 co-regulate EMT-related genes and promote HCC cell migration.\",\n      \"method\": \"Co-immunoprecipitation, ELISA domain-mapping, flow cytometry, migration assays, EMT marker analysis\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — domain mapping by ELISA/flow cytometry plus functional co-regulation; single lab\",\n      \"pmids\": [\"33420124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FAT1 knockdown in esophageal squamous cell carcinoma cells induces nuclear translocation of β-catenin, enhances its transcriptional activity, and upregulates ABCC3 (drug efflux transporter) via β-catenin binding to the ABCC3 promoter, conferring cisplatin resistance and increased stemness.\",\n      \"method\": \"siRNA knockdown, nuclear fractionation, ChIP showing β-catenin enrichment on ABCC3 promoter, luciferase transcription assays, sphere-forming and drug efflux assays\",\n      \"journal\": \"Molecular and Cellular Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus nuclear fractionation plus functional drug resistance phenotype; single lab\",\n      \"pmids\": [\"35606602\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FAT1 is a giant atypical protocadherin that functions as a tumor suppressor and signaling scaffold: it assembles a Hippo signaling complex (via TAOKs) to activate LATS kinases and suppress YAP1/TAZ nuclear activity, undergoes constitutive furin-mediated proteolytic processing to form a surface heterodimer with its intracellular domain capable of nuclear translocation, acts as a molecular brake on mitochondrial respiratory complex activity to restrain cell proliferation, sequesters β-catenin to inhibit its nuclear transcriptional activity, interacts with caspase-8 to suppress death-receptor-mediated apoptosis, and in endothelial cells recruits the E3 ubiquitin ligase MIB2 to promote YAP/TAZ ubiquitination and degradation, thereby limiting angiogenesis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FAT1 is a giant atypical protocadherin that functions as a multifunctional tumor suppressor and signaling scaffold, restraining cell proliferation, EMT, and angiogenesis through convergent regulation of the Hippo, Wnt/β-catenin, and MAPK pathways. FAT1 assembles a Hippo signaling complex by scaffolding TAOK kinases to activate LATS1/2, thereby phosphorylating and inactivating YAP1/TAZ; in endothelial cells it additionally recruits the E3 ubiquitin ligase MIB2 to ubiquitinate and degrade YAP/TAZ, limiting angiogenesis [PMID:29985391, PMID:37031213, PMID:30537512]. Its intracellular domain, released by constitutive furin-mediated proteolytic processing, sequesters β-catenin from the nucleus to suppress Wnt target gene transcription, localizes to mitochondria where it restrains respiratory complex I/II activity and ATP production, and interacts with caspase-8 to prevent DISC assembly and death-receptor-mediated apoptosis [PMID:16682528, PMID:27828948, PMID:24442637, PMID:21680732]. Loss of FAT1 activates a CAMK2–CD44–SRC axis driving YAP1 nuclear translocation and a hybrid EMT state with enhanced tumor stemness and metastasis [PMID:33328637].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that FAT1 undergoes regulated intramembrane proteolysis answered how a giant transmembrane cadherin could signal intracellularly: sequential cleavages release a cytoplasmic domain that translocates to the nucleus via a juxtamembrane NLS.\",\n      \"evidence\": \"EGFP-fusion constructs and deletion mutants in HEK293/HeLa cells with subcellular fractionation\",\n      \"pmids\": [\"15922730\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the second (intramembrane) protease unresolved\", \"Nuclear function of the released IC domain not determined\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying β-catenin as a direct binding partner of the FAT1 intracellular domain established FAT1 as a negative regulator of Wnt signaling, explaining how FAT1 loss increases cyclin D1 expression and proliferation.\",\n      \"evidence\": \"Co-immunoprecipitation, nuclear fractionation, and knockdown in vascular smooth muscle cells with luciferase transcription assays\",\n      \"pmids\": [\"16682528\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and affinity of FAT1-IC/β-catenin interaction unknown\", \"Whether β-catenin sequestration is the dominant anti-proliferative mechanism in vivo unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that furin is the proprotein convertase constitutively cleaving FAT1 at the cell surface resolved the protease identity for the first processing step and revealed aberrant processing in melanoma.\",\n      \"evidence\": \"Furin inhibitor treatment, Western blotting, and subcellular fractionation in keratinocytes and melanoma cells\",\n      \"pmids\": [\"21680732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of melanoma-specific 65-kDa fragment uncharacterized\", \"Furin cleavage site not mapped at residue resolution\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that FAT1 physically sequesters caspase-8 away from the DISC revealed an unexpected anti-apoptotic role, explaining why FAT1 loss sensitizes glioblastoma cells to death-receptor-induced apoptosis.\",\n      \"evidence\": \"Genome-wide siRNA screen, reciprocal Co-IP, DISC immunoprecipitation, and CRISPR knockout in glioblastoma cells\",\n      \"pmids\": [\"24442637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of FAT1–caspase-8 interaction unknown\", \"Whether this anti-apoptotic function operates in non-cancer cell types not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Localization of FAT1-IC fragments to mitochondria and their direct suppression of respiratory complexes I and II established FAT1 as a metabolic brake, linking it to control of proliferation via ATP and aspartate biosynthesis.\",\n      \"evidence\": \"Subcellular fractionation, Co-IP with mitochondrial inner membrane proteins, oximetry, complex activity assays, and Fat1 KO mouse vascular injury model with mitochondria-targeted rescue\",\n      \"pmids\": [\"27828948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which FAT1-IC inhibits supercomplex assembly not structurally resolved\", \"Generality beyond vascular smooth muscle cells not fully explored\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of FAT1 as a scaffold assembling TAOKs and core Hippo kinases into a signalome complex that activates LATS1/2 to phosphorylate YAP1 provided the first direct biochemical link between FAT1 and the Hippo pathway, explaining the tumor-suppressive phenotype of FAT1 loss across cancers.\",\n      \"evidence\": \"Reciprocal Co-IP, kinase activity assays, pan-cancer genomics, and FAT1 loss-of-function in HNSCC cell lines\",\n      \"pmids\": [\"29985391\", \"30537512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise binding interfaces between FAT1-IC and TAOK/LATS not mapped\", \"Whether FAT1 scaffolding is regulated by upstream signals unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic deletion of Fat1 in mouse skin and lung tumors revealed a CAMK2–CD44–SRC axis driving YAP1 nuclear entry and a parallel EZH2-inactivation/SOX2-upregulation circuit, establishing that FAT1 loss induces a hybrid EMT state with enhanced stemness and metastasis.\",\n      \"evidence\": \"Fat1 conditional KO mice, multi-omic transcriptional/chromatin/proteomic profiling, and mechanistic epistasis in SCC and lung tumor models\",\n      \"pmids\": [\"33328637\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CAMK2 activation is a direct or indirect consequence of FAT1 loss not resolved\", \"Relative contribution of YAP1 vs. SOX2 arm to metastasis not fully dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ChIP showing β-catenin binding the ABCC3 promoter upon FAT1 knockdown linked β-catenin de-repression to cisplatin resistance and stemness in esophageal SCC, providing a clinically relevant downstream effector of FAT1-mediated β-catenin control.\",\n      \"evidence\": \"siRNA knockdown, nuclear fractionation, ChIP, luciferase assays, and drug efflux/sphere-forming assays in ESCC cells\",\n      \"pmids\": [\"35606602\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding in one cancer type\", \"Whether ABCC3 is sufficient or necessary for chemoresistance upon FAT1 loss not genetically tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identification of FAT1 as a target antigen in hematopoietic stem cell transplant-associated membranous nephropathy revealed a disease-relevant autoimmune context for FAT1, with anti-FAT1 IgG4 deposited along glomerular basement membranes.\",\n      \"evidence\": \"Laser microdissection/MS of glomeruli, IHC/IF, and Western blot of eluates and serum in two independent patient cohorts\",\n      \"pmids\": [\"35321939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether anti-FAT1 antibodies are pathogenic or epiphenomenal not demonstrated\", \"Epitope(s) on FAT1 recognized by autoantibodies not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery that FAT1 recruits the E3 ligase MIB2 to ubiquitinate YAP/TAZ for proteasomal degradation in endothelial cells provided a Hippo-kinase-independent mechanism of YAP/TAZ suppression and linked FAT1 to angiogenesis control.\",\n      \"evidence\": \"Co-IP identifying MIB2, ubiquitination assays, endothelial-specific FAT1 and MIB2 KO in vitro and in vivo angiogenesis models\",\n      \"pmids\": [\"37031213\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MIB2-mediated degradation operates concurrently with LATS-dependent phosphorylation not addressed\", \"Structural basis of FAT1–MIB2 interaction unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A unified structural and quantitative model integrating FAT1's simultaneous roles as Hippo scaffold, β-catenin sequestrant, mitochondrial brake, caspase-8 inhibitor, and MIB2 recruiter — and how these activities are partitioned across its proteolytic fragments and cell types — remains to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of FAT1 intracellular domain or its complexes\", \"How FAT1-IC is partitioned among mitochondrial, nuclear, and cytoplasmic pools is not quantified\", \"Whether different proteolytic fragments mediate distinct signaling arms has not been tested with separation-of-function mutants\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 5, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 3, 4, 5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 7, 8]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 3, 6, 9, 10, 15]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [\n      \"Hippo signalome (TAOK-MST-LATS scaffold)\"\n    ],\n    \"partners\": [\n      \"CTNNB1\",\n      \"TAOK1\",\n      \"LATS1\",\n      \"CASP8\",\n      \"MIB2\",\n      \"YAP1\",\n      \"GPC3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}