{"gene":"CTNNBIP1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2000,"finding":"ICAT (CTNNBIP1) was identified as a novel beta-catenin-interacting protein that inhibits the interaction of beta-catenin with TCF-4, thereby repressing beta-catenin-TCF-4-mediated transactivation and inhibiting Xenopus axis formation by interfering with Wnt signaling.","method":"Co-immunoprecipitation, transactivation reporter assays, Xenopus axis formation assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays plus functional in vivo rescue, foundational paper replicated extensively by subsequent structural and functional studies","pmids":["10898789"],"is_preprint":false},{"year":2002,"finding":"Crystal structure of ICAT bound to the armadillo repeat domain of beta-catenin revealed that ICAT contains an N-terminal helical domain binding to repeats 11-12 of beta-catenin and an extended C-terminal region binding repeats 5-10 similarly to Tcf/Lef. Full-length ICAT dissociates complexes of beta-catenin, Lef-1, and the coactivator p300, while the helical domain alone selectively blocks binding to p300.","method":"X-ray crystallography, in vitro complex dissociation assays, domain truncation experiments","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional domain mutagenesis; independently replicated by a concurrent structural study (PMID:12408824)","pmids":["12408825"],"is_preprint":false},{"year":2002,"finding":"Crystal structure of the beta-catenin/ICAT complex at 2.5 Å resolution showed that ICAT contains a 3-helix bundle binding armadillo repeats 10-12 and a C-terminal tail binding the groove of armadillo repeats 5-9 similarly to Tcf and E-cadherin. ICAT selectively inhibits beta-catenin/Tcf binding in vivo without disrupting the beta-catenin/cadherin interaction.","method":"X-ray crystallography, in vivo co-immunoprecipitation, selectivity assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus in vivo functional selectivity demonstrated; concurrent with independent structural study (PMID:12408825)","pmids":["12408824"],"is_preprint":false},{"year":2002,"finding":"Overexpression of ICAT inhibits proliferation of colorectal tumor cells with APC or beta-catenin mutations and hepatocellular carcinoma cells with AXIN mutations, inhibits G2 progression by blocking Cdc2 dephosphorylation and nuclear translocation of cyclin B1, leading to G2 arrest and cell death. ICAT did not inhibit growth of normal or tumor cells with wild-type APC/beta-catenin/Axin.","method":"Recombinant adenovirus-mediated ICAT overexpression, cell cycle analysis, xenograft tumor model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean gain-of-function with specific cell cycle readout in multiple cell lines and in vivo xenograft, single lab","pmids":["12036951"],"is_preprint":false},{"year":2003,"finding":"ICAT localizes to both cytoplasmic and nuclear compartments. ICAT is upregulated in mature non-dividing enterocytes lining intestinal villi and absent in the beta-catenin/TCF signaling-active crypt region. ICAT protein levels are not altered by activation or inhibition of Wnt signaling in cultured cells, indicating ICAT expression is not a direct Wnt/beta-catenin target. ICAT does not protect soluble beta-catenin from APC-containing destruction complex degradation. Stable ICAT overexpression in MDCK cells did not disrupt the cadherin complex but enhanced cell scattering on HGF treatment.","method":"Subcellular fractionation, immunofluorescence, immunohistochemistry in intestinal tissue, stable overexpression in MDCK cells, scatter assay","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with functional consequence (HGF-induced scattering), multiple orthogonal methods, single lab","pmids":["14613891"],"is_preprint":false},{"year":2004,"finding":"ICAT knockout (ICAT-/-) embryos exhibit malformation of the forebrain and craniofacial bones and lack the kidney. ICAT promotes anteriorization of neural fate by inhibiting the posteriorizing activity of Wnt3a signaling; ICAT-/- embryonic stem cells differentiate into neuronal cells with posterior character.","method":"Knockout mouse model, embryonic stem cell differentiation assays, neuronal fate analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined developmental phenotype and mechanistic epistasis with Wnt3a","pmids":["15148409"],"is_preprint":false},{"year":2006,"finding":"ICAT overexpression by retroviral gene targeting in CD4-8- thymocytes inhibits the CD4-8- to CD4+8+ transition but not later transitions, demonstrating that canonical Wnt/catenin signaling (via beta- and gamma-catenin binding to Tcf/Lef) is required for early T cell precursor maturation.","method":"Retroviral ICAT overexpression in thymocyte precursors, flow cytometric analysis of T cell development stages","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genetic intervention with defined developmental stage phenotype, single lab","pmids":["16897815"],"is_preprint":false},{"year":2007,"finding":"Loss of ICAT gene function in mice causes arrest of ureteric bud (UB) branching and renal agenesis; ICAT-/- metanephros show delayed UB branching, increased apoptosis of metanephric mesenchymal cells, and renal agenesis.","method":"ICAT knockout mouse model, histology, apoptosis assays in fetal kidney","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function in vivo with defined developmental phenotype, single lab","pmids":["17803964"],"is_preprint":false},{"year":2008,"finding":"Disruption of beta-catenin/TCF interaction by ICAT transgenic expression in adult mice renders thymocytes and activated T cells highly susceptible to apoptosis by reducing Bcl-xL expression below a critical threshold; transgenic Bcl-2 expression rescued activated ICAT-Tg CD4 T cells from apoptosis.","method":"Transgenic mouse expressing ICAT, apoptosis assays, Bcl-xL expression analysis, Bcl-2 transgenic rescue","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with Bcl-2 rescue, clean mechanistic pathway placement, in vivo transgenic model","pmids":["18511409"],"is_preprint":false},{"year":2010,"finding":"In ICAT-/- kidneys, active beta-catenin protein level is elevated and the Wnt target gene Pitx-2 is enhanced, while c-Ret expression is unchanged, suggesting that Pitx-2 upregulation downstream of activated Wnt signaling mediates delays in ureteric bud branching.","method":"Knockout mouse model, DNA microarray, immunohistochemistry, immunoblotting","journal":"Acta histochemica et cytochemica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with target gene identification, single lab, two orthogonal methods","pmids":["20514292"],"is_preprint":false},{"year":2011,"finding":"ICAT is a direct transcriptional target of E2F1; E2F1 activates ICAT expression, and this activation is required for E2F1 to inhibit beta-catenin transcriptional activity, establishing ICAT as the node mediating cross-talk between E2F1 and Wnt/beta-catenin signaling pathways.","method":"Luciferase reporter assays, ChIP, E2F1 gain- and loss-of-function, ICAT knockdown epistasis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct transcriptional regulation plus epistasis experiments, single lab","pmids":["21532622"],"is_preprint":false},{"year":2011,"finding":"ICAT forms a ternary complex with beta-catenin and androgen receptor (AR) in prostate cancer cells. The N-terminal helical domain of ICAT retains rather than displaces the AR-beta-catenin interaction. ICAT expression augments ligand-dependent AR-mediated transcription and enhances expression of PSA and KLK2 androgen-response genes. ICAT is recruited to the PSA promoter in LNCaP cells.","method":"GST pulldown, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), shRNA knockdown, stable ICAT overexpression in prostate cancer cell lines","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pulldown plus endogenous Co-IP plus ChIP, single lab, multiple orthogonal methods","pmids":["21885566"],"is_preprint":false},{"year":2013,"finding":"ICAT interacts with the pancreatic transcription factor Ptf1a (identified by yeast two-hybrid screening and validated in vitro and in vivo). ICAT negatively regulates PTF1 transcriptional activity independently of beta-catenin by directly binding Ptf1a, displacing the coactivator P/CAF, reducing the Ptf1a-Rbpjl interaction, and impairing Ptf1a acetylation by P/CAF.","method":"Yeast two-hybrid, in vitro binding assays, co-immunoprecipitation in acinar tumor cells, reporter assays, acetylation assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid discovery validated by in vitro and in vivo co-IP plus mechanistic acetylation assay, single lab","pmids":["23339455"],"is_preprint":false},{"year":2014,"finding":"Ectopic ICAT expression in metastatic melanoma cells did not affect proliferation but increased cell motility and Matrigel invasion, converting cells from elongated/mesenchymal to round/amoeboid morphology. This transition was dependent on stable ICAT-beta-catenin interaction and associated with decreased levels of NEDD9 and activated Rac1, and promoted lung colonization in nude mice.","method":"Ectopic ICAT expression, Matrigel invasion assays, morphological analysis, Rac1 activity assays, in vivo lung colonization model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with defined mechanistic pathway (Rac1/NEDD9) and in vivo validation, single lab","pmids":["24514042"],"is_preprint":false},{"year":2017,"finding":"ICAT promotes cervical cancer EMT by competing with E-cadherin for binding to beta-catenin (disrupting the E-cadherin/beta-catenin complex), as demonstrated by co-immunoprecipitation assays. ICAT overexpression promoted SiHa cell proliferation and enhanced migration/invasion, while knockdown had opposite effects.","method":"Co-immunoprecipitation, ICAT overexpression and knockdown, in vitro proliferation/migration/invasion assays, xenograft mouse model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating competitive displacement of E-cadherin from beta-catenin plus functional phenotypic assays, single lab","pmids":["29048651"],"is_preprint":false},{"year":2017,"finding":"PLD1 promotes Wnt/beta-catenin signaling by selectively downregulating ICAT via the PI3K/Akt-TopBP1-E2F1 signaling pathway, establishing ICAT as a node of cross-talk between PLD1/PI3K/Akt and Wnt/beta-catenin pathways in colorectal cancer.","method":"In vivo mouse models (Apc+, AOM/DSS), colorectal cancer cell lines, pathway inhibitor experiments, gene expression analysis","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro epistasis experiments with defined pathway placement, single lab","pmids":["28939743"],"is_preprint":false},{"year":2017,"finding":"Structure-based mutagenesis of ICAT showed that Y15, K19, and V22 in the N-terminal helical domain contact beta-catenin F660; abolishing this hydrophobic hook interaction completely eliminated ICAT-beta-catenin binding. In the C-terminal tail, neutralizing electrostatic interactions (D66, E75) plus deletion of F71 hydrophobic contact markedly reduced but did not abolish ICAT-mediated inhibition of M-MITF and NEDD9 promoters.","method":"Site-directed mutagenesis, co-immunoprecipitation, luciferase reporter assays for target gene promoters in melanoma cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — structure-guided mutagenesis with functional validation in cells, single lab","pmids":["28273108"],"is_preprint":false},{"year":2020,"finding":"E2F1 promotes pre-adipocyte differentiation by activating ICAT, which in turn represses Wnt/beta-catenin activity. ICAT overexpression in 3T3-L1 pre-adipocytes promotes adipogenesis and partially reverses beta-catenin activation-induced inhibition of differentiation. Gene silencing of ICAT in E2F1-overexpressing cells inhibited adipogenesis, confirming ICAT is required downstream of E2F1.","method":"ICAT overexpression, siRNA knockdown epistasis, 3T3-L1 differentiation assays, lipid accumulation assays, Western blotting","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis rescue experiments with multiple functional readouts, single lab","pmids":["32326181"],"is_preprint":false},{"year":2021,"finding":"ICAT overexpression in CRC stable cell lines binds beta-catenin in the cytoplasm (confirmed by co-immunoprecipitation and co-localization by immunofluorescence), preventing its nuclear translocation and inactivating Wnt signaling with reduction of CCND1 and MYC downstream targets.","method":"Co-immunoprecipitation, immunofluorescence, ICAT stable overexpression, TOPflash reporter, in vivo xenograft","journal":"Technology in cancer research & treatment","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus immunofluorescence co-localization demonstrating cytoplasmic sequestration of beta-catenin, single lab","pmids":["34569368"],"is_preprint":false},{"year":2022,"finding":"ICAT overexpression promotes colorectal cancer cell migration and invasion in vitro and tumor metastasis in vivo by interacting with junction plakoglobin (JUP), a beta-catenin homolog; JUP downregulation impairs ICAT-induced migration. Additionally, ICAT overexpression activates the NF-κB signaling pathway to enhance migration/invasion.","method":"Co-IP/mass spectrometry, STRING database validation, immunofluorescence, wound healing and transwell assays, in vivo lung metastasis model","journal":"Journal of clinical laboratory analysis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification of JUP interaction plus JUP knockdown epistasis and NF-κB pathway activation, single lab","pmids":["36036768"],"is_preprint":false},{"year":2025,"finding":"ICAT facilitates nuclear translocation of c-Myc in cervical cancer cells, enhancing ENO1 transcription and promoting glycolytic activity and lactate accumulation. Tumor-derived lactate induces H3K18 lactylation in tumor-associated macrophages, activating ARG1 expression and driving M2 polarization to create an immunosuppressive tumor microenvironment.","method":"Mechanistic cell-based assays, c-Myc nuclear translocation analysis, ENO1 transcription assays, macrophage co-culture, H3K18 lactylation detection, in vivo tumor models","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway dissection with multiple readouts including epigenetic lactylation endpoint, single lab","pmids":["40976412"],"is_preprint":false},{"year":2025,"finding":"In a cardiac hypertrophy model, overexpression of ICAT suppressed isoproterenol-induced increases in beta-catenin, phosphorylated ERK, and cardiomyocyte surface area, establishing ICAT as a negative regulator of cardiac hypertrophy via the beta-catenin/ERK axis.","method":"ICAT overexpression in cardiomyocytes, LC-MS proteomics, cardiomyocyte surface area measurement, ERK phosphorylation assays, in vivo HFD/L-NAME mouse model","journal":"Hypertension research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single overexpression experiment in cardiomyocytes with mechanistic readout but limited functional rescue validation","pmids":["40903537"],"is_preprint":false}],"current_model":"CTNNBIP1/ICAT is a small ~9 kDa protein whose N-terminal 3-helix bundle binds armadillo repeats 10-12 of beta-catenin and whose C-terminal tail occupies the same groove (repeats 5-9) used by TCF/LEF transcription factors and E-cadherin, thereby competitively inhibiting beta-catenin-TCF-mediated Wnt target gene transcription; it also blocks beta-catenin's interaction with the coactivator p300 through its helical domain. Beyond canonical Wnt inhibition, ICAT is a direct transcriptional target of E2F1, forms a ternary complex with beta-catenin and androgen receptor to modulate AR signaling, interacts with the pancreatic transcription factor Ptf1a to repress PTF1 activity independently of beta-catenin, binds junction plakoglobin (JUP) to activate NF-κB-mediated invasion, and can facilitate c-Myc nuclear translocation to drive glycolysis and macrophage polarization in the tumor microenvironment; in vivo, ICAT loss causes forebrain malformation, craniofacial defects, renal agenesis, and impaired thymocyte survival by reducing Bcl-xL below a critical threshold."},"narrative":{"mechanistic_narrative":"CTNNBIP1 (ICAT) is a small competitive inhibitor of canonical Wnt signaling that binds beta-catenin and represses beta-catenin-TCF/LEF-mediated transactivation [PMID:10898789]. Structurally, an N-terminal 3-helix bundle engages armadillo repeats 10-12 while an extended C-terminal tail occupies the groove of repeats 5-9 used by Tcf/Lef and E-cadherin, allowing ICAT to dissociate beta-catenin-Lef1-p300 complexes and selectively block beta-catenin/Tcf binding without disrupting the cadherin complex [PMID:12408825, PMID:12408824]; a Y15/K19/V22 hydrophobic hook contacting beta-catenin F660 is essential for binding, while C-terminal contacts contribute partial inhibition [PMID:28273108]. Functionally, ICAT can sequester beta-catenin in the cytoplasm to prevent its nuclear translocation, lowering CCND1 and MYC output [PMID:34569368]. ICAT is a direct transcriptional target of E2F1, serving as the node through which E2F1 antagonizes Wnt/beta-catenin signaling [PMID:21532622], a relationship deployed during pre-adipocyte differentiation [PMID:32326181] and downregulated by PLD1 via the PI3K/Akt-TopBP1-E2F1 axis to promote Wnt activity in colorectal cancer [PMID:28939743]. Beyond Wnt, ICAT exerts beta-catenin-independent and context-dependent roles: it directly binds the pancreatic transcription factor Ptf1a to repress PTF1 activity by displacing the P/CAF coactivator and impairing Ptf1a acetylation [PMID:23339455], forms a ternary complex with beta-catenin and androgen receptor to augment AR-driven transcription [PMID:21885566], and binds junction plakoglobin (JUP) to activate NF-kappaB-driven migration and invasion [PMID:36036768]. In vivo, ICAT loss causes forebrain and craniofacial malformation, renal agenesis from arrested ureteric bud branching with elevated active beta-catenin and Pitx-2, and impaired thymocyte/T-cell survival through reduction of Bcl-xL below a critical threshold [PMID:15148409, PMID:17803964, PMID:20514292, PMID:18511409].","teleology":[{"year":2000,"claim":"Established the founding function of ICAT by answering whether a dedicated inhibitor of the beta-catenin-TCF interaction exists.","evidence":"Co-immunoprecipitation, transactivation reporter assays, and Xenopus axis formation","pmids":["10898789"],"confidence":"High","gaps":["Structural basis of selective inhibition unresolved","Endogenous regulation of ICAT not addressed"]},{"year":2002,"claim":"Resolved how ICAT mechanically discriminates among beta-catenin partners by mapping its two-domain binding mode on the armadillo repeats.","evidence":"X-ray crystallography of ICAT-beta-catenin with complex-dissociation and selectivity assays","pmids":["12408825","12408824"],"confidence":"High","gaps":["Did not establish physiological contexts of selective Tcf vs p300 vs cadherin displacement","In vivo relevance of dissociation activity not tested"]},{"year":2002,"claim":"Tested whether ICAT could act as a tumor suppressor by killing Wnt-pathway-mutant cancer cells.","evidence":"Adenoviral ICAT overexpression with cell-cycle analysis and xenografts in APC/beta-catenin/AXIN-mutant lines","pmids":["12036951"],"confidence":"Medium","gaps":["Single lab gain-of-function","Mechanism linking Wnt inhibition to G2 arrest and Cdc2 not fully defined"]},{"year":2003,"claim":"Addressed where ICAT acts and whether it is itself Wnt-regulated, defining its expression pattern and limits of its activity.","evidence":"Subcellular fractionation, immunohistochemistry in intestine, and MDCK scatter assays","pmids":["14613891"],"confidence":"Medium","gaps":["Mechanism of HGF-enhanced scattering not defined","Upstream control of ICAT expression unknown"]},{"year":2004,"claim":"Defined the developmental requirement for ICAT by showing its loss disrupts neural anteriorization and organogenesis.","evidence":"ICAT knockout mice and ES-cell neuronal differentiation with Wnt3a epistasis","pmids":["15148409"],"confidence":"High","gaps":["Tissue-specific contributions not separated","Downstream Wnt targets in forebrain not identified"]},{"year":2006,"claim":"Tested the requirement for canonical Wnt/catenin signaling in T-cell development using ICAT as a pathway block.","evidence":"Retroviral ICAT overexpression in thymocyte precursors with flow cytometry","pmids":["16897815"],"confidence":"Medium","gaps":["Overexpression-based block may exceed physiological inhibition","Target genes driving the CD4-8- transition not identified"]},{"year":2007,"claim":"Linked ICAT loss to a specific organogenesis defect, renal agenesis from ureteric bud arrest.","evidence":"ICAT knockout mouse histology and apoptosis assays in fetal kidney","pmids":["17803964"],"confidence":"Medium","gaps":["Molecular mediators of UB branching arrest not defined here","Single lab"]},{"year":2008,"claim":"Placed ICAT's pro-survival role mechanistically by showing beta-catenin/TCF disruption sensitizes T cells to apoptosis through Bcl-xL.","evidence":"ICAT transgenic mice with apoptosis assays, Bcl-xL analysis, and Bcl-2 transgenic rescue","pmids":["18511409"],"confidence":"High","gaps":["Whether endogenous ICAT regulates Bcl-xL not tested","Direct transcriptional link between TCF and Bcl-xL not shown"]},{"year":2010,"claim":"Identified the downstream effector of ICAT loss in kidney as elevated active beta-catenin driving Pitx-2.","evidence":"Knockout mouse microarray, immunohistochemistry, and immunoblotting","pmids":["20514292"],"confidence":"Medium","gaps":["Causality of Pitx-2 in branching not directly tested","c-Ret-independence leaves alternative pathways open"]},{"year":2011,"claim":"Established ICAT as the node connecting E2F1 and Wnt by showing E2F1 directly transactivates ICAT.","evidence":"Luciferase reporters, ChIP, and E2F1/ICAT gain- and loss-of-function epistasis","pmids":["21532622"],"confidence":"Medium","gaps":["Physiological contexts of E2F1-ICAT axis not mapped here","Single lab"]},{"year":2011,"claim":"Revealed a non-inhibitory, coactivator-like role for ICAT by showing it forms a ternary complex with beta-catenin and AR and augments AR transcription.","evidence":"GST pulldown, Co-IP, ChIP on PSA promoter, and shRNA in prostate cancer cells","pmids":["21885566"],"confidence":"Medium","gaps":["Structural basis for AR-beta-catenin retention vs Tcf displacement unclear","Single lab"]},{"year":2013,"claim":"Demonstrated a beta-catenin-independent function by showing ICAT directly represses the pancreatic factor Ptf1a.","evidence":"Yeast two-hybrid, in vitro/in vivo binding, reporter and acetylation assays in acinar tumor cells","pmids":["23339455"],"confidence":"Medium","gaps":["In vivo pancreatic relevance not established","Single lab"]},{"year":2014,"claim":"Showed ICAT can paradoxically promote metastatic behavior via a beta-catenin-dependent mesenchymal-to-amoeboid switch.","evidence":"Ectopic expression, Matrigel invasion, Rac1/NEDD9 assays, and lung colonization in mice (melanoma)","pmids":["24514042"],"confidence":"Medium","gaps":["How beta-catenin binding lowers NEDD9/Rac1 mechanistically unclear","Context-dependence vs tumor-suppressive role unexplained"]},{"year":2017,"claim":"Identified competitive displacement of E-cadherin from beta-catenin as a route to ICAT-driven EMT in cervical cancer.","evidence":"Co-IP, overexpression/knockdown, invasion assays, and xenografts in SiHa cells","pmids":["29048651"],"confidence":"Medium","gaps":["Reconciliation with earlier finding that ICAT spares the cadherin complex needed","Single lab"]},{"year":2017,"claim":"Defined the upstream regulation that suppresses ICAT to license Wnt activity in colorectal cancer.","evidence":"Apc and AOM/DSS mouse models with pathway inhibitor experiments establishing PLD1/PI3K/Akt-TopBP1-E2F1 control of ICAT","pmids":["28939743"],"confidence":"Medium","gaps":["Direct biochemical link between TopBP1-E2F1 and ICAT promoter not shown","Single lab"]},{"year":2017,"claim":"Pinpointed the binding residues governing ICAT-beta-catenin affinity and target repression.","evidence":"Structure-based mutagenesis with Co-IP and reporter assays on M-MITF/NEDD9 promoters","pmids":["28273108"],"confidence":"Medium","gaps":["Effects validated only in melanoma promoter context","C-terminal contribution only partially defined"]},{"year":2020,"claim":"Extended the E2F1-ICAT axis to adipogenesis, showing ICAT is required downstream of E2F1 to permit differentiation.","evidence":"ICAT overexpression and siRNA epistasis in 3T3-L1 differentiation assays","pmids":["32326181"],"confidence":"Medium","gaps":["In vivo adipogenic role not tested","Single lab"]},{"year":2021,"claim":"Clarified the subcellular mechanism of Wnt inhibition by showing cytoplasmic ICAT sequesters beta-catenin to block nuclear entry.","evidence":"Co-IP, immunofluorescence co-localization, TOPflash, and xenografts in CRC lines","pmids":["34569368"],"confidence":"Medium","gaps":["Quantitative contribution of sequestration vs displacement unclear","Single lab"]},{"year":2022,"claim":"Identified JUP as a beta-catenin-homolog partner mediating an ICAT-driven, NF-kappaB-dependent pro-metastatic program.","evidence":"Co-IP/mass spectrometry, JUP knockdown epistasis, and lung metastasis model in CRC","pmids":["36036768"],"confidence":"Medium","gaps":["Direct ICAT-JUP binding interface not mapped","Mechanism of NF-kappaB activation unresolved"]},{"year":2025,"claim":"Connected ICAT to metabolic reprogramming and immune evasion via c-Myc-driven glycolysis and lactylation-mediated macrophage polarization.","evidence":"c-Myc translocation, ENO1 transcription, macrophage co-culture, H3K18 lactylation, and in vivo tumor models (cervical cancer)","pmids":["40976412"],"confidence":"Medium","gaps":["How ICAT facilitates c-Myc nuclear translocation not defined","Single lab"]},{"year":2025,"claim":"Proposed a cardioprotective role for ICAT as a negative regulator of hypertrophy via the beta-catenin/ERK axis.","evidence":"ICAT overexpression in cardiomyocytes with proteomics, surface-area, and ERK phosphorylation assays plus HFD/L-NAME mice","pmids":["40903537"],"confidence":"Low","gaps":["Single overexpression experiment without loss-of-function rescue","Direct link between beta-catenin and ERK not established"]},{"year":null,"claim":"It remains unresolved how ICAT switches between beta-catenin-dependent inhibition, coactivator-like AR support, and beta-catenin-independent transcriptional repression in a context-specific manner.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling tumor-suppressive vs pro-metastatic roles","Endogenous regulators determining context not identified","No structural data for ICAT-JUP or ICAT-Ptf1a complexes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2,16]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[11,12]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,18]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[18]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,18]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,7,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[13,14,19,20]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,11,12]}],"complexes":[],"partners":["CTNNB1","TCF7L2","LEF1","EP300","AR","PTF1A","JUP","CDH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NSA3","full_name":"Beta-catenin-interacting protein 1","aliases":["Inhibitor of beta-catenin and Tcf-4"],"length_aa":81,"mass_kda":9.2,"function":"Prevents the interaction between CTNNB1 and TCF family members, and acts as a negative regulator of the Wnt signaling pathway","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9NSA3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CTNNBIP1","classification":"Not Classified","n_dependent_lines":37,"n_total_lines":1208,"dependency_fraction":0.030629139072847682},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CTNNBIP1","total_profiled":1310},"omim":[{"mim_id":"610458","title":"LEUCINE ZIPPER AND CTNNBIP1 DOMAINS-CONTAINING PROTEIN; LZIC","url":"https://www.omim.org/entry/610458"},{"mim_id":"607758","title":"CATENIN, BETA-INTERACTING PROTEIN 1; CTNNBIP1","url":"https://www.omim.org/entry/607758"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"esophagus","ntpm":168.6},{"tissue":"skin 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illness in Vietnamese primary care (ICAT): a study protocol for a cluster randomised controlled trial.","date":"2020","source":"BMJ open","url":"https://pubmed.ncbi.nlm.nih.gov/33361164","citation_count":5,"is_preprint":false},{"pmid":"37805599","id":"PMC_37805599","title":"CTNNBIP1-CLSTN1 functions as a housekeeping chimeric RNA and regulates cell proliferation through SERPINE2.","date":"2023","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/37805599","citation_count":4,"is_preprint":false},{"pmid":"36181623","id":"PMC_36181623","title":"Knockout of ICAT in Adipose Tissue Alleviates Fibro-inflammation in Obese Mice.","date":"2022","source":"Inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/36181623","citation_count":4,"is_preprint":false},{"pmid":"28273108","id":"PMC_28273108","title":"Structure-based mutational analysis of ICAT residues mediating negative regulation of β-catenin co-transcriptional activity.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28273108","citation_count":4,"is_preprint":false},{"pmid":"19569129","id":"PMC_19569129","title":"ICAT as a potential enhancer of monocytic differentiation: implications from the comparative proteome analysis of the HL60 cell line stimulated by all-trans retinoic acid and NSC67657.","date":"2009","source":"Cell biochemistry and function","url":"https://pubmed.ncbi.nlm.nih.gov/19569129","citation_count":4,"is_preprint":false},{"pmid":"30973299","id":"PMC_30973299","title":"Leucine zipper and ICAT domain containing (LZIC) protein regulates cell cycle transitions in response to ionizing radiation.","date":"2019","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/30973299","citation_count":3,"is_preprint":false},{"pmid":"29050252","id":"PMC_29050252","title":"Opposing roles of ICAT and Wnt/β-catenin signaling in NSC67657-induced monocytic differentiation.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29050252","citation_count":3,"is_preprint":false},{"pmid":"34316355","id":"PMC_34316355","title":"iCAT: diagnostic assessment tool of immunological history using high-throughput T-cell receptor sequencing.","date":"2021","source":"F1000Research","url":"https://pubmed.ncbi.nlm.nih.gov/34316355","citation_count":2,"is_preprint":false},{"pmid":"20514292","id":"PMC_20514292","title":"High expression of Pitx-2 in the ICAT-deficient metanephros leads to developmental arrest.","date":"2010","source":"Acta histochemica et cytochemica","url":"https://pubmed.ncbi.nlm.nih.gov/20514292","citation_count":2,"is_preprint":false},{"pmid":"31277165","id":"PMC_31277165","title":"Treatment rationale and design of the induction chemotherapy and adjuvant thoracic radiation in resectable N2-3A/3B non-small cell lung cancer (ICAT) study.","date":"2019","source":"Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31277165","citation_count":2,"is_preprint":false},{"pmid":"41179319","id":"PMC_41179319","title":"PKCζ, CTNNBIP1 and ALDH1A3 Expression in Luminal B Breast Cancer Indicates Decreased Hormone Therapy Effectiveness.","date":"2025","source":"Cancer diagnosis & prognosis","url":"https://pubmed.ncbi.nlm.nih.gov/41179319","citation_count":1,"is_preprint":false},{"pmid":"40600659","id":"PMC_40600659","title":"miR-423-3p inhibits CTNNBIP1/WNT preventing hyperandrogenic polycystic ovary syndrome†.","date":"2025","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/40600659","citation_count":1,"is_preprint":false},{"pmid":"39279723","id":"PMC_39279723","title":"ICAT-Mediated Crosstalk Between Cervical Cancer Cells and Macrophages Promotes M2-Like Macrophage Polarization to Reinforce Tumor Malignant Behaviors.","date":"2024","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/39279723","citation_count":1,"is_preprint":false},{"pmid":"40903537","id":"PMC_40903537","title":"Goreisan attenuates cardiac hypertrophy and diastolic dysfunction in heart failure with preserved ejection fraction induced by HFD/L-NAME via regulation of ICAT-β-catenin/ERK axis.","date":"2025","source":"Hypertension research : official journal of the Japanese Society of Hypertension","url":"https://pubmed.ncbi.nlm.nih.gov/40903537","citation_count":1,"is_preprint":false},{"pmid":"27087369","id":"PMC_27087369","title":"[Expression of ICAT and Wnt signaling-related proteins in the monocytic differentiation of HL-60 cells induced by a new steroidal drug NSC67657].","date":"2016","source":"Zhonghua zhong liu za zhi [Chinese journal of oncology]","url":"https://pubmed.ncbi.nlm.nih.gov/27087369","citation_count":1,"is_preprint":false},{"pmid":"40559541","id":"PMC_40559541","title":"Pathophysiology of COVID-19: A Post Hoc Analysis of the ICAT-COVID Clinical Trial of the Bradykinin Antagonist Icatibant.","date":"2025","source":"Pathogens (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/40559541","citation_count":1,"is_preprint":false},{"pmid":"37503100","id":"PMC_37503100","title":"CTNNBIP1-CLSTN1 Functions as a Housekeeping Chimeric RNA, and Regulates Cell Proliferation through SERPINE2.","date":"2023","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/37503100","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51721,"output_tokens":5573,"usd":0.119379,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14102,"output_tokens":5471,"usd":0.103642,"stage2_stop_reason":"end_turn"},"total_usd":0.223021,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"ICAT (CTNNBIP1) was identified as a novel beta-catenin-interacting protein that inhibits the interaction of beta-catenin with TCF-4, thereby repressing beta-catenin-TCF-4-mediated transactivation and inhibiting Xenopus axis formation by interfering with Wnt signaling.\",\n      \"method\": \"Co-immunoprecipitation, transactivation reporter assays, Xenopus axis formation assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assays plus functional in vivo rescue, foundational paper replicated extensively by subsequent structural and functional studies\",\n      \"pmids\": [\"10898789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structure of ICAT bound to the armadillo repeat domain of beta-catenin revealed that ICAT contains an N-terminal helical domain binding to repeats 11-12 of beta-catenin and an extended C-terminal region binding repeats 5-10 similarly to Tcf/Lef. Full-length ICAT dissociates complexes of beta-catenin, Lef-1, and the coactivator p300, while the helical domain alone selectively blocks binding to p300.\",\n      \"method\": \"X-ray crystallography, in vitro complex dissociation assays, domain truncation experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional domain mutagenesis; independently replicated by a concurrent structural study (PMID:12408824)\",\n      \"pmids\": [\"12408825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structure of the beta-catenin/ICAT complex at 2.5 Å resolution showed that ICAT contains a 3-helix bundle binding armadillo repeats 10-12 and a C-terminal tail binding the groove of armadillo repeats 5-9 similarly to Tcf and E-cadherin. ICAT selectively inhibits beta-catenin/Tcf binding in vivo without disrupting the beta-catenin/cadherin interaction.\",\n      \"method\": \"X-ray crystallography, in vivo co-immunoprecipitation, selectivity assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus in vivo functional selectivity demonstrated; concurrent with independent structural study (PMID:12408825)\",\n      \"pmids\": [\"12408824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Overexpression of ICAT inhibits proliferation of colorectal tumor cells with APC or beta-catenin mutations and hepatocellular carcinoma cells with AXIN mutations, inhibits G2 progression by blocking Cdc2 dephosphorylation and nuclear translocation of cyclin B1, leading to G2 arrest and cell death. ICAT did not inhibit growth of normal or tumor cells with wild-type APC/beta-catenin/Axin.\",\n      \"method\": \"Recombinant adenovirus-mediated ICAT overexpression, cell cycle analysis, xenograft tumor model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean gain-of-function with specific cell cycle readout in multiple cell lines and in vivo xenograft, single lab\",\n      \"pmids\": [\"12036951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ICAT localizes to both cytoplasmic and nuclear compartments. ICAT is upregulated in mature non-dividing enterocytes lining intestinal villi and absent in the beta-catenin/TCF signaling-active crypt region. ICAT protein levels are not altered by activation or inhibition of Wnt signaling in cultured cells, indicating ICAT expression is not a direct Wnt/beta-catenin target. ICAT does not protect soluble beta-catenin from APC-containing destruction complex degradation. Stable ICAT overexpression in MDCK cells did not disrupt the cadherin complex but enhanced cell scattering on HGF treatment.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, immunohistochemistry in intestinal tissue, stable overexpression in MDCK cells, scatter assay\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with functional consequence (HGF-induced scattering), multiple orthogonal methods, single lab\",\n      \"pmids\": [\"14613891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ICAT knockout (ICAT-/-) embryos exhibit malformation of the forebrain and craniofacial bones and lack the kidney. ICAT promotes anteriorization of neural fate by inhibiting the posteriorizing activity of Wnt3a signaling; ICAT-/- embryonic stem cells differentiate into neuronal cells with posterior character.\",\n      \"method\": \"Knockout mouse model, embryonic stem cell differentiation assays, neuronal fate analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined developmental phenotype and mechanistic epistasis with Wnt3a\",\n      \"pmids\": [\"15148409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ICAT overexpression by retroviral gene targeting in CD4-8- thymocytes inhibits the CD4-8- to CD4+8+ transition but not later transitions, demonstrating that canonical Wnt/catenin signaling (via beta- and gamma-catenin binding to Tcf/Lef) is required for early T cell precursor maturation.\",\n      \"method\": \"Retroviral ICAT overexpression in thymocyte precursors, flow cytometric analysis of T cell development stages\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genetic intervention with defined developmental stage phenotype, single lab\",\n      \"pmids\": [\"16897815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Loss of ICAT gene function in mice causes arrest of ureteric bud (UB) branching and renal agenesis; ICAT-/- metanephros show delayed UB branching, increased apoptosis of metanephric mesenchymal cells, and renal agenesis.\",\n      \"method\": \"ICAT knockout mouse model, histology, apoptosis assays in fetal kidney\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function in vivo with defined developmental phenotype, single lab\",\n      \"pmids\": [\"17803964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Disruption of beta-catenin/TCF interaction by ICAT transgenic expression in adult mice renders thymocytes and activated T cells highly susceptible to apoptosis by reducing Bcl-xL expression below a critical threshold; transgenic Bcl-2 expression rescued activated ICAT-Tg CD4 T cells from apoptosis.\",\n      \"method\": \"Transgenic mouse expressing ICAT, apoptosis assays, Bcl-xL expression analysis, Bcl-2 transgenic rescue\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with Bcl-2 rescue, clean mechanistic pathway placement, in vivo transgenic model\",\n      \"pmids\": [\"18511409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In ICAT-/- kidneys, active beta-catenin protein level is elevated and the Wnt target gene Pitx-2 is enhanced, while c-Ret expression is unchanged, suggesting that Pitx-2 upregulation downstream of activated Wnt signaling mediates delays in ureteric bud branching.\",\n      \"method\": \"Knockout mouse model, DNA microarray, immunohistochemistry, immunoblotting\",\n      \"journal\": \"Acta histochemica et cytochemica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with target gene identification, single lab, two orthogonal methods\",\n      \"pmids\": [\"20514292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ICAT is a direct transcriptional target of E2F1; E2F1 activates ICAT expression, and this activation is required for E2F1 to inhibit beta-catenin transcriptional activity, establishing ICAT as the node mediating cross-talk between E2F1 and Wnt/beta-catenin signaling pathways.\",\n      \"method\": \"Luciferase reporter assays, ChIP, E2F1 gain- and loss-of-function, ICAT knockdown epistasis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct transcriptional regulation plus epistasis experiments, single lab\",\n      \"pmids\": [\"21532622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ICAT forms a ternary complex with beta-catenin and androgen receptor (AR) in prostate cancer cells. The N-terminal helical domain of ICAT retains rather than displaces the AR-beta-catenin interaction. ICAT expression augments ligand-dependent AR-mediated transcription and enhances expression of PSA and KLK2 androgen-response genes. ICAT is recruited to the PSA promoter in LNCaP cells.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation, chromatin immunoprecipitation (ChIP), shRNA knockdown, stable ICAT overexpression in prostate cancer cell lines\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown plus endogenous Co-IP plus ChIP, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21885566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ICAT interacts with the pancreatic transcription factor Ptf1a (identified by yeast two-hybrid screening and validated in vitro and in vivo). ICAT negatively regulates PTF1 transcriptional activity independently of beta-catenin by directly binding Ptf1a, displacing the coactivator P/CAF, reducing the Ptf1a-Rbpjl interaction, and impairing Ptf1a acetylation by P/CAF.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assays, co-immunoprecipitation in acinar tumor cells, reporter assays, acetylation assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid discovery validated by in vitro and in vivo co-IP plus mechanistic acetylation assay, single lab\",\n      \"pmids\": [\"23339455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ectopic ICAT expression in metastatic melanoma cells did not affect proliferation but increased cell motility and Matrigel invasion, converting cells from elongated/mesenchymal to round/amoeboid morphology. This transition was dependent on stable ICAT-beta-catenin interaction and associated with decreased levels of NEDD9 and activated Rac1, and promoted lung colonization in nude mice.\",\n      \"method\": \"Ectopic ICAT expression, Matrigel invasion assays, morphological analysis, Rac1 activity assays, in vivo lung colonization model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with defined mechanistic pathway (Rac1/NEDD9) and in vivo validation, single lab\",\n      \"pmids\": [\"24514042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ICAT promotes cervical cancer EMT by competing with E-cadherin for binding to beta-catenin (disrupting the E-cadherin/beta-catenin complex), as demonstrated by co-immunoprecipitation assays. ICAT overexpression promoted SiHa cell proliferation and enhanced migration/invasion, while knockdown had opposite effects.\",\n      \"method\": \"Co-immunoprecipitation, ICAT overexpression and knockdown, in vitro proliferation/migration/invasion assays, xenograft mouse model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating competitive displacement of E-cadherin from beta-catenin plus functional phenotypic assays, single lab\",\n      \"pmids\": [\"29048651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PLD1 promotes Wnt/beta-catenin signaling by selectively downregulating ICAT via the PI3K/Akt-TopBP1-E2F1 signaling pathway, establishing ICAT as a node of cross-talk between PLD1/PI3K/Akt and Wnt/beta-catenin pathways in colorectal cancer.\",\n      \"method\": \"In vivo mouse models (Apc+, AOM/DSS), colorectal cancer cell lines, pathway inhibitor experiments, gene expression analysis\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro epistasis experiments with defined pathway placement, single lab\",\n      \"pmids\": [\"28939743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Structure-based mutagenesis of ICAT showed that Y15, K19, and V22 in the N-terminal helical domain contact beta-catenin F660; abolishing this hydrophobic hook interaction completely eliminated ICAT-beta-catenin binding. In the C-terminal tail, neutralizing electrostatic interactions (D66, E75) plus deletion of F71 hydrophobic contact markedly reduced but did not abolish ICAT-mediated inhibition of M-MITF and NEDD9 promoters.\",\n      \"method\": \"Site-directed mutagenesis, co-immunoprecipitation, luciferase reporter assays for target gene promoters in melanoma cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-guided mutagenesis with functional validation in cells, single lab\",\n      \"pmids\": [\"28273108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"E2F1 promotes pre-adipocyte differentiation by activating ICAT, which in turn represses Wnt/beta-catenin activity. ICAT overexpression in 3T3-L1 pre-adipocytes promotes adipogenesis and partially reverses beta-catenin activation-induced inhibition of differentiation. Gene silencing of ICAT in E2F1-overexpressing cells inhibited adipogenesis, confirming ICAT is required downstream of E2F1.\",\n      \"method\": \"ICAT overexpression, siRNA knockdown epistasis, 3T3-L1 differentiation assays, lipid accumulation assays, Western blotting\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis rescue experiments with multiple functional readouts, single lab\",\n      \"pmids\": [\"32326181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ICAT overexpression in CRC stable cell lines binds beta-catenin in the cytoplasm (confirmed by co-immunoprecipitation and co-localization by immunofluorescence), preventing its nuclear translocation and inactivating Wnt signaling with reduction of CCND1 and MYC downstream targets.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, ICAT stable overexpression, TOPflash reporter, in vivo xenograft\",\n      \"journal\": \"Technology in cancer research & treatment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus immunofluorescence co-localization demonstrating cytoplasmic sequestration of beta-catenin, single lab\",\n      \"pmids\": [\"34569368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ICAT overexpression promotes colorectal cancer cell migration and invasion in vitro and tumor metastasis in vivo by interacting with junction plakoglobin (JUP), a beta-catenin homolog; JUP downregulation impairs ICAT-induced migration. Additionally, ICAT overexpression activates the NF-κB signaling pathway to enhance migration/invasion.\",\n      \"method\": \"Co-IP/mass spectrometry, STRING database validation, immunofluorescence, wound healing and transwell assays, in vivo lung metastasis model\",\n      \"journal\": \"Journal of clinical laboratory analysis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification of JUP interaction plus JUP knockdown epistasis and NF-κB pathway activation, single lab\",\n      \"pmids\": [\"36036768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ICAT facilitates nuclear translocation of c-Myc in cervical cancer cells, enhancing ENO1 transcription and promoting glycolytic activity and lactate accumulation. Tumor-derived lactate induces H3K18 lactylation in tumor-associated macrophages, activating ARG1 expression and driving M2 polarization to create an immunosuppressive tumor microenvironment.\",\n      \"method\": \"Mechanistic cell-based assays, c-Myc nuclear translocation analysis, ENO1 transcription assays, macrophage co-culture, H3K18 lactylation detection, in vivo tumor models\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway dissection with multiple readouts including epigenetic lactylation endpoint, single lab\",\n      \"pmids\": [\"40976412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In a cardiac hypertrophy model, overexpression of ICAT suppressed isoproterenol-induced increases in beta-catenin, phosphorylated ERK, and cardiomyocyte surface area, establishing ICAT as a negative regulator of cardiac hypertrophy via the beta-catenin/ERK axis.\",\n      \"method\": \"ICAT overexpression in cardiomyocytes, LC-MS proteomics, cardiomyocyte surface area measurement, ERK phosphorylation assays, in vivo HFD/L-NAME mouse model\",\n      \"journal\": \"Hypertension research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single overexpression experiment in cardiomyocytes with mechanistic readout but limited functional rescue validation\",\n      \"pmids\": [\"40903537\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CTNNBIP1/ICAT is a small ~9 kDa protein whose N-terminal 3-helix bundle binds armadillo repeats 10-12 of beta-catenin and whose C-terminal tail occupies the same groove (repeats 5-9) used by TCF/LEF transcription factors and E-cadherin, thereby competitively inhibiting beta-catenin-TCF-mediated Wnt target gene transcription; it also blocks beta-catenin's interaction with the coactivator p300 through its helical domain. Beyond canonical Wnt inhibition, ICAT is a direct transcriptional target of E2F1, forms a ternary complex with beta-catenin and androgen receptor to modulate AR signaling, interacts with the pancreatic transcription factor Ptf1a to repress PTF1 activity independently of beta-catenin, binds junction plakoglobin (JUP) to activate NF-κB-mediated invasion, and can facilitate c-Myc nuclear translocation to drive glycolysis and macrophage polarization in the tumor microenvironment; in vivo, ICAT loss causes forebrain malformation, craniofacial defects, renal agenesis, and impaired thymocyte survival by reducing Bcl-xL below a critical threshold.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CTNNBIP1 (ICAT) is a small competitive inhibitor of canonical Wnt signaling that binds beta-catenin and represses beta-catenin-TCF/LEF-mediated transactivation [#0]. Structurally, an N-terminal 3-helix bundle engages armadillo repeats 10-12 while an extended C-terminal tail occupies the groove of repeats 5-9 used by Tcf/Lef and E-cadherin, allowing ICAT to dissociate beta-catenin-Lef1-p300 complexes and selectively block beta-catenin/Tcf binding without disrupting the cadherin complex [#1, #2]; a Y15/K19/V22 hydrophobic hook contacting beta-catenin F660 is essential for binding, while C-terminal contacts contribute partial inhibition [#16]. Functionally, ICAT can sequester beta-catenin in the cytoplasm to prevent its nuclear translocation, lowering CCND1 and MYC output [#18]. ICAT is a direct transcriptional target of E2F1, serving as the node through which E2F1 antagonizes Wnt/beta-catenin signaling [#10], a relationship deployed during pre-adipocyte differentiation [#17] and downregulated by PLD1 via the PI3K/Akt-TopBP1-E2F1 axis to promote Wnt activity in colorectal cancer [#15]. Beyond Wnt, ICAT exerts beta-catenin-independent and context-dependent roles: it directly binds the pancreatic transcription factor Ptf1a to repress PTF1 activity by displacing the P/CAF coactivator and impairing Ptf1a acetylation [#12], forms a ternary complex with beta-catenin and androgen receptor to augment AR-driven transcription [#11], and binds junction plakoglobin (JUP) to activate NF-kappaB-driven migration and invasion [#19]. In vivo, ICAT loss causes forebrain and craniofacial malformation, renal agenesis from arrested ureteric bud branching with elevated active beta-catenin and Pitx-2, and impaired thymocyte/T-cell survival through reduction of Bcl-xL below a critical threshold [#5, #7, #9, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the founding function of ICAT by answering whether a dedicated inhibitor of the beta-catenin-TCF interaction exists.\",\n      \"evidence\": \"Co-immunoprecipitation, transactivation reporter assays, and Xenopus axis formation\",\n      \"pmids\": [\"10898789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of selective inhibition unresolved\", \"Endogenous regulation of ICAT not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved how ICAT mechanically discriminates among beta-catenin partners by mapping its two-domain binding mode on the armadillo repeats.\",\n      \"evidence\": \"X-ray crystallography of ICAT-beta-catenin with complex-dissociation and selectivity assays\",\n      \"pmids\": [\"12408825\", \"12408824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish physiological contexts of selective Tcf vs p300 vs cadherin displacement\", \"In vivo relevance of dissociation activity not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Tested whether ICAT could act as a tumor suppressor by killing Wnt-pathway-mutant cancer cells.\",\n      \"evidence\": \"Adenoviral ICAT overexpression with cell-cycle analysis and xenografts in APC/beta-catenin/AXIN-mutant lines\",\n      \"pmids\": [\"12036951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab gain-of-function\", \"Mechanism linking Wnt inhibition to G2 arrest and Cdc2 not fully defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Addressed where ICAT acts and whether it is itself Wnt-regulated, defining its expression pattern and limits of its activity.\",\n      \"evidence\": \"Subcellular fractionation, immunohistochemistry in intestine, and MDCK scatter assays\",\n      \"pmids\": [\"14613891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of HGF-enhanced scattering not defined\", \"Upstream control of ICAT expression unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the developmental requirement for ICAT by showing its loss disrupts neural anteriorization and organogenesis.\",\n      \"evidence\": \"ICAT knockout mice and ES-cell neuronal differentiation with Wnt3a epistasis\",\n      \"pmids\": [\"15148409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions not separated\", \"Downstream Wnt targets in forebrain not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Tested the requirement for canonical Wnt/catenin signaling in T-cell development using ICAT as a pathway block.\",\n      \"evidence\": \"Retroviral ICAT overexpression in thymocyte precursors with flow cytometry\",\n      \"pmids\": [\"16897815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-based block may exceed physiological inhibition\", \"Target genes driving the CD4-8- transition not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked ICAT loss to a specific organogenesis defect, renal agenesis from ureteric bud arrest.\",\n      \"evidence\": \"ICAT knockout mouse histology and apoptosis assays in fetal kidney\",\n      \"pmids\": [\"17803964\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mediators of UB branching arrest not defined here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed ICAT's pro-survival role mechanistically by showing beta-catenin/TCF disruption sensitizes T cells to apoptosis through Bcl-xL.\",\n      \"evidence\": \"ICAT transgenic mice with apoptosis assays, Bcl-xL analysis, and Bcl-2 transgenic rescue\",\n      \"pmids\": [\"18511409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous ICAT regulates Bcl-xL not tested\", \"Direct transcriptional link between TCF and Bcl-xL not shown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified the downstream effector of ICAT loss in kidney as elevated active beta-catenin driving Pitx-2.\",\n      \"evidence\": \"Knockout mouse microarray, immunohistochemistry, and immunoblotting\",\n      \"pmids\": [\"20514292\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causality of Pitx-2 in branching not directly tested\", \"c-Ret-independence leaves alternative pathways open\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established ICAT as the node connecting E2F1 and Wnt by showing E2F1 directly transactivates ICAT.\",\n      \"evidence\": \"Luciferase reporters, ChIP, and E2F1/ICAT gain- and loss-of-function epistasis\",\n      \"pmids\": [\"21532622\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts of E2F1-ICAT axis not mapped here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a non-inhibitory, coactivator-like role for ICAT by showing it forms a ternary complex with beta-catenin and AR and augments AR transcription.\",\n      \"evidence\": \"GST pulldown, Co-IP, ChIP on PSA promoter, and shRNA in prostate cancer cells\",\n      \"pmids\": [\"21885566\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for AR-beta-catenin retention vs Tcf displacement unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated a beta-catenin-independent function by showing ICAT directly represses the pancreatic factor Ptf1a.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro/in vivo binding, reporter and acetylation assays in acinar tumor cells\",\n      \"pmids\": [\"23339455\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo pancreatic relevance not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed ICAT can paradoxically promote metastatic behavior via a beta-catenin-dependent mesenchymal-to-amoeboid switch.\",\n      \"evidence\": \"Ectopic expression, Matrigel invasion, Rac1/NEDD9 assays, and lung colonization in mice (melanoma)\",\n      \"pmids\": [\"24514042\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How beta-catenin binding lowers NEDD9/Rac1 mechanistically unclear\", \"Context-dependence vs tumor-suppressive role unexplained\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified competitive displacement of E-cadherin from beta-catenin as a route to ICAT-driven EMT in cervical cancer.\",\n      \"evidence\": \"Co-IP, overexpression/knockdown, invasion assays, and xenografts in SiHa cells\",\n      \"pmids\": [\"29048651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation with earlier finding that ICAT spares the cadherin complex needed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the upstream regulation that suppresses ICAT to license Wnt activity in colorectal cancer.\",\n      \"evidence\": \"Apc and AOM/DSS mouse models with pathway inhibitor experiments establishing PLD1/PI3K/Akt-TopBP1-E2F1 control of ICAT\",\n      \"pmids\": [\"28939743\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between TopBP1-E2F1 and ICAT promoter not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Pinpointed the binding residues governing ICAT-beta-catenin affinity and target repression.\",\n      \"evidence\": \"Structure-based mutagenesis with Co-IP and reporter assays on M-MITF/NEDD9 promoters\",\n      \"pmids\": [\"28273108\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effects validated only in melanoma promoter context\", \"C-terminal contribution only partially defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended the E2F1-ICAT axis to adipogenesis, showing ICAT is required downstream of E2F1 to permit differentiation.\",\n      \"evidence\": \"ICAT overexpression and siRNA epistasis in 3T3-L1 differentiation assays\",\n      \"pmids\": [\"32326181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo adipogenic role not tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Clarified the subcellular mechanism of Wnt inhibition by showing cytoplasmic ICAT sequesters beta-catenin to block nuclear entry.\",\n      \"evidence\": \"Co-IP, immunofluorescence co-localization, TOPflash, and xenografts in CRC lines\",\n      \"pmids\": [\"34569368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of sequestration vs displacement unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified JUP as a beta-catenin-homolog partner mediating an ICAT-driven, NF-kappaB-dependent pro-metastatic program.\",\n      \"evidence\": \"Co-IP/mass spectrometry, JUP knockdown epistasis, and lung metastasis model in CRC\",\n      \"pmids\": [\"36036768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ICAT-JUP binding interface not mapped\", \"Mechanism of NF-kappaB activation unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected ICAT to metabolic reprogramming and immune evasion via c-Myc-driven glycolysis and lactylation-mediated macrophage polarization.\",\n      \"evidence\": \"c-Myc translocation, ENO1 transcription, macrophage co-culture, H3K18 lactylation, and in vivo tumor models (cervical cancer)\",\n      \"pmids\": [\"40976412\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How ICAT facilitates c-Myc nuclear translocation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed a cardioprotective role for ICAT as a negative regulator of hypertrophy via the beta-catenin/ERK axis.\",\n      \"evidence\": \"ICAT overexpression in cardiomyocytes with proteomics, surface-area, and ERK phosphorylation assays plus HFD/L-NAME mice\",\n      \"pmids\": [\"40903537\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single overexpression experiment without loss-of-function rescue\", \"Direct link between beta-catenin and ERK not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ICAT switches between beta-catenin-dependent inhibition, coactivator-like AR support, and beta-catenin-independent transcriptional repression in a context-specific manner.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling tumor-suppressive vs pro-metastatic roles\", \"Endogenous regulators determining context not identified\", \"No structural data for ICAT-JUP or ICAT-Ptf1a complexes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2, 16]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 18]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 18]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 7, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 14, 19, 20]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 11, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CTNNB1\", \"TCF7L2\", \"LEF1\", \"EP300\", \"AR\", \"PTF1A\", \"JUP\", \"CDH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}