{"gene":"TCIM","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2000,"finding":"TC-1 (C8orf4) was cloned as a novel gene overexpressed in papillary thyroid carcinoma; the full-length mRNA encodes a 106-amino-acid protein that is ubiquitously expressed in human tissues, localizes to chromosome 8p11.2, and three regulatory motifs were identified in its 5' flanking sequence.","method":"Suppression subtractive hybridization, RT-PCR, Northern analysis, 5'-RACE, primer extension, fluorescence in situ hybridization (FISH)","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal molecular methods in a single foundational cloning study, single lab","pmids":["11056052"],"is_preprint":false},{"year":2004,"finding":"TC-1 (C8orf4) protein is monomeric and predominantly unstructured (natively disordered) at physiological salt and pH. Recombinant TC-1 can be phosphorylated in vitro by cyclic AMP-dependent protein kinase (PKA) and protein kinase C (PKC), and stable transfection of TC-1 into normal thyroid cells upregulates the activity of both kinases while conferring increased proliferation, anchorage-independent growth, and reduced apoptosis.","method":"Recombinant protein expression, in vitro kinase assay, stable transfection of normal thyroid cells, soft-agar colony formation, apoptosis assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase reconstitution combined with structural characterization (natively disordered) and functional cellular loss-of-function/gain-of-function, single lab with multiple orthogonal methods","pmids":["15087392"],"is_preprint":false},{"year":2006,"finding":"TC1 (C8orf4) functions as a positive regulator of the Wnt/β-catenin pathway by directly interacting with Chibby (Cby), a nuclear antagonist of β-catenin-mediated transcription. TC1 binding to Cby relieves its inhibitory effect, enhancing β-catenin target gene expression (including MMP-7, MMP-14, laminin γ2). Upon co-expression, TC1 redistributes from nucleolus to nuclear speckles where it co-localizes with Cby.","method":"Co-immunoprecipitation, co-localization by immunofluorescence, β-catenin reporter assay, RT-PCR for target genes, mammalian cell transfection","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, co-localization, and reporter assay in the same study; replicated in follow-up studies across multiple cancer types","pmids":["16424001"],"is_preprint":false},{"year":2006,"finding":"TC1 (C8orf4) expression correlates with Wnt/β-catenin target genes (laminin γ2, MMP-7, MMP-14, cyclin D1, c-Met, CD44) in gastric cancer tissue; overexpression in MKN45 cells enhances Matrigel invasiveness and proliferation, and TC1 expression increases after serial peritoneal seeding in nude mice.","method":"Tissue microarray with IHC, Matrigel invasion assay, proliferation assay, serial in vivo peritoneal seeding","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional in vitro assays plus in vivo model, single lab; no direct mechanistic reconstitution beyond pathway correlation","pmids":["16740781"],"is_preprint":false},{"year":2006,"finding":"TC1 (C8orf4) is upregulated by pro-inflammatory cytokines IL-1β and TNF-α in follicular dendritic cells (FDC-like HK line) and enhances their proliferation; TC1 knockdown inhibits IL-1β-induced proliferation, placing TC1 downstream of these cytokines in FDC proliferation regulation.","method":"RT-PCR, siRNA knockdown, cell proliferation assay in HK cells","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean knockdown with specific proliferative phenotype, single lab, single cell type","pmids":["16730711"],"is_preprint":false},{"year":2007,"finding":"NMR spectroscopy showed that TC-1 is intrinsically disordered but adopts compact conformations with three regions of high helical propensity (D44–R53, K58–A64, D73–T88) in its C-terminal portion. Upon addition of Chibby, significant resonance broadening from these helical regions indicates that TC-1 interacts with Cby through its transient helical structure.","method":"NMR spectroscopy (15N-labeled protein), chemical shift analysis, relaxation measurements, titration with Cby","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure determination with functional binding validation, orthogonal to Co-IP data from another lab","pmids":["17905836"],"is_preprint":false},{"year":2007,"finding":"TC1 (C8orf4) is upregulated by heat shock and other cellular stresses (H2O2, TPA, LPS, UV), and upon upregulation TC1 protein translocates into the nucleus independently of NF-κB activation. TC1 upregulates heat shock proteins, TC1 knockdown inhibits stress-induced downstream regulation, and TC1 and HSF1 mutually upregulate each other, suggesting a positive feedback loop in heat shock response.","method":"qRT-PCR, Western blot, immunofluorescence for nuclear translocation, siRNA knockdown, reporter/expression analysis in multiple cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — nuclear translocation directly observed by imaging plus knockdown phenotype, single lab with multiple cell lines","pmids":["17603013"],"is_preprint":false},{"year":2007,"finding":"TC-1 overexpression in human mammary epithelial (HME) cells confers anchorage-independent and growth-factor-independent proliferation. TC-1 expression is downregulated by the FGFR inhibitor PD173074 in FGFR2-amplified SUM-52 breast cancer cells, and forced FGFR2 expression in HME cells increases endogenous TC-1 mRNA, placing TC-1 downstream of FGFR2 signaling.","method":"Stable transfection, soft-agar colony formation, pharmacological inhibition (PD173074), forced FGFR2 expression, RT-PCR","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic epistasis linking FGFR2 to TC-1, single lab, multiple orthogonal approaches","pmids":["17520678"],"is_preprint":false},{"year":2008,"finding":"TC1 (C8orf4) mRNA is upregulated by mitogens (FBS/thrombin) at least partially via the ERK1/2 signaling pathway. Overexpression of TC1 promotes G1-to-S phase transition and significantly increases cyclin D1 promoter-driven luciferase activity; this effect is delayed when ERK1/2 signaling is deficient.","method":"qRT-PCR, ERK1/2 pathway inhibition, flow cytometry cell-cycle analysis, cyclin D1 promoter luciferase reporter assay","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter plus cell-cycle analysis plus epistasis with ERK1/2, single lab","pmids":["18959821"],"is_preprint":false},{"year":2009,"finding":"TC1 (C8orf4) is upregulated by IL-1β, TNF-α, LPS, and phorbol ester in human aortic endothelial cells and umbilical vein endothelial cells, and this upregulation is blocked by IκB-kinase inhibitors. TC1 overexpression upregulates inflammatory mediators (IL-6, IL-1α, COX-2, CXCL1, CCL2, CCL5, IL-8, ICAM1, VCAM1, E-selectin) and enhances nuclear translocation of RelA and NF-κB DNA-binding activity, suggesting TC1 amplifies NF-κB signaling via positive feedback. TC1 knockdown downregulates these inflammatory parameters. Zebrafish TC1 overexpression induces edema.","method":"Endothelial cell transfection/knockdown, ELISA, qRT-PCR, NF-κB nuclear translocation assay (immunofluorescence), EMSA (DNA-binding), monocyte adhesion assay, permeability assay, zebrafish overexpression","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal mechanistic readouts (NF-κB translocation, DNA binding, cytokine expression), replicated across two human endothelial cell types and zebrafish model","pmids":["19684084"],"is_preprint":false},{"year":2004,"finding":"C8orf4 is induced by TGF-β signaling in colon adenoma cells (Vaco 330) and is downregulated in metastatic colon cancer, placing it as a TGF-β-responsive gene that may participate in colon cell differentiation or growth regulation.","method":"Expression microarray, Northern analysis, real-time RT-PCR","journal":"International journal of cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptional induction by TGF-β confirmed by multiple quantitative methods but no mechanistic follow-up (no promoter or pathway experiments); single lab","pmids":["15185345"],"is_preprint":false},{"year":2013,"finding":"TC-1 (C8orf4) overexpression in A549 non-small cell lung cancer cells promotes proliferation, invasion, and migration, and increases expression of Wnt/β-catenin downstream genes (VEGF, MMP-7, cyclin D1, c-myc, survivin) at mRNA and protein levels; TC-1 knockdown has opposite effects.","method":"Lentiviral overexpression/knockdown, MTT assay, Matrigel invasion, scratch-wound assay, qRT-PCR, Western blot","journal":"The Journal of surgical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway-level readouts, single lab","pmids":["23880650"],"is_preprint":false},{"year":2015,"finding":"Human TC-1 (hTC-1/C8orf4) expressed heterologously in yeast functions as a pro-survival protein: it suppresses cell death and growth inhibition induced by copper sulfate and blocks the deleterious effects of over-expressed pro-apoptotic proteins (YCA1, YBH3, NUC1, AIF1). TC-1 orthologs are restricted to jawed vertebrates with no ortholog detected in yeast, confirming its vertebrate-specific origin.","method":"Heterologous expression of hTC-1 in Saccharomyces cerevisiae, growth/viability assays with copper and pro-apoptotic gene overexpression, bioinformatic ortholog analysis","journal":"Microbial cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue experiments in yeast across multiple death stimuli, single lab","pmids":["28357300"],"is_preprint":false},{"year":2016,"finding":"C8orf4 is hypermethylated and downregulated in fibrotic lung fibroblasts compared to controls. siRNA knockdown of C8orf4 in control fibroblasts downregulates COX-2 and PGE2 production, generating a fibrotic-like phenotype. Chromatin immunoprecipitation (ChIP) demonstrated that C8orf4 binds the proximal promoter of COX-2, establishing it as a direct transcriptional regulator of COX-2 expression.","method":"Bisulfite sequencing, methylation microarray, siRNA knockdown, ChIP assay, PGE2 ELISA, qRT-PCR, 5-aza-2'-deoxycytidine treatment","journal":"Clinical science","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP directly demonstrates promoter binding, combined with functional siRNA knockdown and epigenetic characterization, single lab but multiple orthogonal methods","pmids":["26744410"],"is_preprint":false},{"year":2016,"finding":"Tc1-knockout (Tc1-/-) mice show adipose tissue hyperplasia with smaller, more numerous adipocytes, enhanced glucose tolerance, and reduced serum lipids. Adipocyte-derived stem cells (ADSCs) from Tc1-/- mice display enhanced proliferative and adipogenic capacity; PPARγ and CEBPα are robustly upregulated upon adipogenic induction, while Wisp2 and Dlk1 (adipogenesis inhibitors) are downregulated. TC1-transfected NIH3T3 cells show higher β-catenin reporter activity, linking canonical Wnt signaling to Tc1-dependent adipose regulation.","method":"Tc1 knockout mouse model, histomorphometry, glucose tolerance test, serum lipid measurement, ADSC isolation and differentiation, qRT-PCR, β-catenin reporter assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple defined metabolic and cellular phenotypes, mechanistic link to β-catenin signaling confirmed by reporter assay, single lab","pmids":["27775060"],"is_preprint":false},{"year":2016,"finding":"TC-1 knockdown combined with radiation inhibits proliferation and induces apoptosis in NSCLC A549 cells more effectively than either treatment alone, and this is associated with inactivation of Wnt/β-catenin signaling; the Wnt/β-catenin inhibitor XAV939 phenocopies TC-1 knockdown, confirming epistasis. Combined TC-1 siRNA and radiation also caused significant tumor regression in A549 xenografts.","method":"siRNA knockdown, MTT assay, flow cytometry, Western blot for β-catenin pathway, XAV939 pharmacological inhibition, xenograft model","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological epistasis confirming pathway placement, single lab","pmids":["27029901"],"is_preprint":false},{"year":2019,"finding":"In human adipose-derived mesenchymal stem cells (hADSCs), miR-30a directly binds the 3'-UTR of C8orf4 to inhibit its expression (validated by luciferase reporter assay). The lncRNA H19 acts as a competing endogenous RNA (ceRNA) for miR-30a, thereby augmenting C8orf4 expression and promoting adipogenic differentiation. H19 knockdown suppresses C8orf4 expression and adipogenesis, which can be partially reversed by miR-30a inhibition.","method":"TargetScan prediction, luciferase reporter gene assay (3'-UTR binding), miRNA/lncRNA overexpression and knockdown, qRT-PCR, Western blot, adipogenic differentiation assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'-UTR binding validated by luciferase reporter plus epistasis rescue experiment, single lab","pmids":["31026067"],"is_preprint":false}],"current_model":"TCIM (TC-1/C8orf4) is a 106-residue vertebrate-specific, intrinsically disordered protein that functions as a positive regulator of the Wnt/β-catenin pathway by binding Chibby (via C-terminal transient helical regions) and relieving Chibby's antagonism of β-catenin-mediated transcription; it can be phosphorylated by PKA and PKC, amplifies NF-κB signaling via positive feedback in endothelial cells, directly binds and activates the COX-2 promoter in fibroblasts, is regulated downstream of FGFR2 and ERK1/2 to promote G1-to-S cell-cycle transition through cyclin D1 upregulation, and acts as a pro-survival factor whose deletion in mice leads to adipose hyperplasia with enhanced adipogenic stem cell activity linked to canonical Wnt signaling."},"narrative":{"mechanistic_narrative":"TCIM (TC-1/C8orf4) is a vertebrate-specific, intrinsically disordered 106-residue signaling adaptor that acts as a stress- and mitogen-inducible amplifier of proliferative, inflammatory, and pro-survival programs [PMID:11056052, PMID:15087392, PMID:19684084]. Its central mechanistic role is positive regulation of Wnt/β-catenin signaling: it directly binds Chibby, a nuclear antagonist of β-catenin-mediated transcription, relieving Chibby's inhibition and enhancing expression of β-catenin target genes, with co-expression redistributing TCIM from the nucleolus to nuclear speckles where it colocalizes with Chibby [PMID:16424001]. NMR analysis establishes that although TCIM is natively disordered, it carries three C-terminal regions of high helical propensity that mediate the Chibby interaction through transient helical structure [PMID:17905836]. Beyond the Wnt axis, TCIM is induced by pro-inflammatory cytokines and cellular stress and acts within positive-feedback loops: it amplifies NF-κB signaling in endothelial cells by promoting RelA nuclear translocation and DNA binding and inducing inflammatory mediators [PMID:19684084], participates in a mutual-upregulation loop with HSF1 in the heat shock response [PMID:17603013], and binds directly to the COX-2 proximal promoter to drive COX-2/PGE2 expression in fibroblasts [PMID:26744410]. TCIM is positioned downstream of FGFR2 and ERK1/2 mitogenic signaling, where it promotes the G1-to-S transition through cyclin D1 induction [PMID:17520678, PMID:18959821], and functions as a pro-survival factor that suppresses multiple death stimuli [PMID:28357300]. In vivo, Tc1-knockout mice develop adipose hyperplasia with enhanced adipogenic stem-cell activity linked to canonical Wnt signaling [PMID:27775060], and C8orf4 expression is itself tuned post-transcriptionally by a miR-30a/H19 ceRNA axis during adipogenesis [PMID:31026067].","teleology":[{"year":2000,"claim":"Establishing that TCIM is a discrete, ubiquitously expressed gene overexpressed in thyroid carcinoma framed it as a candidate proliferation-associated factor rather than an artifact.","evidence":"Suppression subtractive hybridization, RACE, Northern, and FISH cloning of C8orf4 from papillary thyroid carcinoma","pmids":["11056052"],"confidence":"Medium","gaps":["No protein-level function assigned at cloning","Regulatory motifs identified but not functionally tested","Disease association correlative, not causal"]},{"year":2004,"claim":"Biophysical and cellular characterization answered what kind of protein TCIM is, showing it is monomeric and natively disordered, is a PKA/PKC substrate, and confers transformation-associated phenotypes.","evidence":"Recombinant protein structural assessment, in vitro kinase assays, and stable transfection of normal thyroid cells","pmids":["15087392"],"confidence":"High","gaps":["Functional consequence of PKA/PKC phosphorylation not mapped to sites","Mechanism linking disorder to kinase activation unresolved"]},{"year":2004,"claim":"Identification of C8orf4 as a TGF-β-responsive gene downregulated in metastatic colon cancer hinted at context-dependent regulation but provided no mechanism.","evidence":"Expression microarray, Northern, and real-time RT-PCR in colon adenoma cells","pmids":["15185345"],"confidence":"Low","gaps":["No promoter or pathway experiments performed","Correlative expression only","Direction of regulation differs from oncogenic contexts, unexplained"]},{"year":2006,"claim":"Discovery of the direct Chibby interaction defined TCIM's core molecular mechanism as a relief of Wnt/β-catenin antagonism, transforming it from a correlated marker into a pathway regulator.","evidence":"Reciprocal Co-IP, immunofluorescence colocalization, and β-catenin reporter/target-gene assays in mammalian cells; correlative invasion/proliferation data in gastric cancer","pmids":["16424001","16740781"],"confidence":"High","gaps":["Stoichiometry and affinity of TCIM–Chibby binding not quantified here","Whether displacement of Chibby is direct competition or allosteric unclear"]},{"year":2007,"claim":"NMR resolved how a disordered protein achieves specific binding, localizing the Chibby interaction to three transient C-terminal helical regions.","evidence":"15N NMR spectroscopy, chemical shift and relaxation analysis, and titration with Chibby","pmids":["17905836"],"confidence":"High","gaps":["No bound-state complex structure","Helical residues not mutated to confirm necessity for function"]},{"year":2007,"claim":"Stress and FGFR2 epistasis experiments placed TCIM in inducible upstream signaling, showing it translocates to the nucleus upon stress, feeds back on HSF1, and lies downstream of FGFR2.","evidence":"qRT-PCR, immunofluorescence nuclear-translocation, siRNA knockdown across cell lines; pharmacological FGFR inhibition and forced FGFR2 expression with soft-agar assays","pmids":["17603013","17520678"],"confidence":"Medium","gaps":["Nuclear import mechanism unknown","HSF1 feedback shown by mutual upregulation but not direct interaction","Intermediate steps between FGFR2 and TCIM induction undefined"]},{"year":2008,"claim":"Linking TCIM to ERK1/2-driven cyclin D1 induction explained how its mitogenic upregulation translates into cell-cycle progression.","evidence":"qRT-PCR, ERK1/2 inhibition, flow-cytometry cell-cycle analysis, and cyclin D1 promoter luciferase reporter","pmids":["18959821"],"confidence":"Medium","gaps":["Whether TCIM acts directly on the cyclin D1 promoter or via β-catenin not distinguished","ERK1/2-to-TCIM link epistatic, not biochemical"]},{"year":2009,"claim":"Reciprocal gain/loss-of-function in endothelial cells established TCIM as an NF-κB amplifier acting through a positive-feedback loop, broadening its role into inflammation.","evidence":"Endothelial transfection/knockdown, ELISA, qRT-PCR, NF-κB translocation imaging, EMSA, adhesion/permeability assays, and zebrafish overexpression","pmids":["19684084"],"confidence":"High","gaps":["Molecular target of TCIM within the NF-κB cascade not identified","Direct binding partner mediating RelA effects unknown"]},{"year":2013,"claim":"Reciprocal modulation in lung cancer cells reinforced the TCIM–Wnt/β-catenin link in a new tumor context.","evidence":"Lentiviral overexpression/knockdown with MTT, invasion, migration assays, qRT-PCR and Western blot of Wnt targets in A549 cells","pmids":["23880650"],"confidence":"Medium","gaps":["Pathway readouts correlative, no direct mechanistic test","Does not separate Wnt from NF-κB contributions"]},{"year":2015,"claim":"Heterologous yeast expression provided a clean test of intrinsic pro-survival activity and confirmed TCIM's vertebrate-specific origin.","evidence":"Expression of human TC-1 in S. cerevisiae with copper and pro-apoptotic gene challenge plus bioinformatic ortholog analysis","pmids":["28357300"],"confidence":"Medium","gaps":["Yeast lacks Chibby/Wnt machinery, so mechanism of survival in this system unidentified","Relevance to mammalian apoptosis pathways inferred"]},{"year":2016,"claim":"ChIP demonstrated TCIM is a direct transcriptional regulator of COX-2, and a knockout mouse plus radiation epistasis defined its in vivo physiological roles and confirmed Wnt dependence.","evidence":"ChIP, siRNA, PGE2 ELISA and methylation analysis in fibroblasts; Tc1-/- mouse phenotyping with β-catenin reporter; siRNA+XAV939 epistasis and xenografts","pmids":["26744410","27775060","27029901"],"confidence":"High","gaps":["How a disordered protein binds the COX-2 promoter (direct DNA contact vs adaptor) unresolved","Tissue specificity of Wnt-dependent phenotypes not fully mapped"]},{"year":2019,"claim":"Defining a miR-30a/H19 ceRNA axis explained how C8orf4 levels are set post-transcriptionally during adipogenic differentiation.","evidence":"TargetScan, 3'-UTR luciferase reporter, miRNA/lncRNA over/knockdown rescue, and adipogenic differentiation assays in hADSCs","pmids":["31026067"],"confidence":"Medium","gaps":["Other regulators of C8orf4 mRNA stability not surveyed","Connection between this axis and downstream Wnt/PPARγ program inferred"]},{"year":null,"claim":"The biochemical basis by which a single disordered protein integrates Wnt, NF-κB, HSF1, and COX-2 outputs—and whether phosphorylation switches between these activities—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of TCIM bound to any partner other than NMR-mapped Chibby helices","Functional role of PKA/PKC phosphorylation sites uncharacterized","Whether COX-2 promoter occupancy reflects direct DNA binding or recruitment is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5,9]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[6,7,8,9]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[2]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[2,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,6,9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,9,14]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,9]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[6,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,13]}],"complexes":[],"partners":["CBY1","HSF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NR00","full_name":"Transcriptional and immune response regulator","aliases":["Thyroid cancer protein 1","TC-1"],"length_aa":106,"mass_kda":12.3,"function":"Seems to be involved in the regulation of cell growth an differentiation, may play different and opposite roles depending on the tissue or cell type. May enhance the WNT-CTNNB1 pathway by relieving antagonistic activity of CBY1 (PubMed:16424001, PubMed:16730711). Enhances the proliferation of follicular dendritic cells (PubMed:16730711). Plays a role in the mitogen-activated MAPK2/3 signaling pathway, positively regulates G1-to-S-phase transition of the cell cycle (PubMed:18959821). In endothelial cells, enhances key inflammatory mediators and inflammatory response through the modulation of NF-kappaB transcriptional regulatory activity (PubMed:19684084). Involved in the regulation of heat shock response, seems to play a positive feedback with HSF1 to modulate heat-shock downstream gene expression (PubMed:17603013). Plays a role in the regulation of hematopoiesis even if the mechanisms are unknown (By similarity). In cancers such as thyroid or lung cancer, it has been described as promoter of cell proliferation, G1-to-S-phase transition and inhibitor of apoptosis (PubMed:15087392, PubMed:24941347). However, it negatively regulates self-renewal of liver cancer cells via suppresion of NOTCH2 signaling (PubMed:25985737)","subcellular_location":"Cytoplasm; Nucleus, nucleolus; Nucleus speckle; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9NR00/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TCIM","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TCIM","total_profiled":1310},"omim":[{"mim_id":"607702","title":"TRANSCRIPTIONAL AND IMMUNE RESPONSE REGULATOR; TCIM","url":"https://www.omim.org/entry/607702"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TCIM"},"hgnc":{"alias_symbol":["TC-1","hTC-1","TC1"],"prev_symbol":["C8orf4"]},"alphafold":{"accession":"Q9NR00","domains":[{"cath_id":"1.10.287","chopping":"46-104","consensus_level":"high","plddt":85.8188,"start":46,"end":104}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR00","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR00-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR00-F1-predicted_aligned_error_v6.png","plddt_mean":78.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TCIM","jax_strain_url":"https://www.jax.org/strain/search?query=TCIM"},"sequence":{"accession":"Q9NR00","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NR00.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NR00/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR00"}},"corpus_meta":[{"pmid":"29842886","id":"PMC_29842886","title":"Circular RNA circZFR contributes to papillary thyroid cancer cell proliferation and invasion by sponging miR-1261 and facilitating C8orf4 expression.","date":"2018","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/29842886","citation_count":97,"is_preprint":false},{"pmid":"2410062","id":"PMC_2410062","title":"Hematopoietic factor production by a cell line (TC-1) derived from adherent murine marrow cells.","date":"1985","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/2410062","citation_count":97,"is_preprint":false},{"pmid":"8805628","id":"PMC_8805628","title":"Inhibition of TC-1 cytokine production, effector cytotoxic T lymphocyte development and alloantibody production by 2,3,7,8-tetrachlorodibenzo-p-dioxin.","date":"1996","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/8805628","citation_count":83,"is_preprint":false},{"pmid":"12559790","id":"PMC_12559790","title":"Immunisation with modified HPV16 E7 genes against mouse oncogenic TC-1 cell sublines with downregulated expression of MHC class I molecules.","date":"2003","source":"Vaccine","url":"https://pubmed.ncbi.nlm.nih.gov/12559790","citation_count":77,"is_preprint":false},{"pmid":"26744410","id":"PMC_26744410","title":"Epigenetic regulation of cyclooxygenase-2 by methylation of c8orf4 in pulmonary fibrosis.","date":"2016","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/26744410","citation_count":67,"is_preprint":false},{"pmid":"28979120","id":"PMC_28979120","title":"Engineered outer membrane vesicle is potent to elicit HPV16E7-specific cellular immunity in a mouse model of TC-1 graft tumor.","date":"2017","source":"International journal of nanomedicine","url":"https://pubmed.ncbi.nlm.nih.gov/28979120","citation_count":64,"is_preprint":false},{"pmid":"15087392","id":"PMC_15087392","title":"TC-1 is a novel tumorigenic and natively disordered protein associated with thyroid 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The japanese journal of urology","url":"https://pubmed.ncbi.nlm.nih.gov/1479760","citation_count":1,"is_preprint":false},{"pmid":"29962199","id":"PMC_29962199","title":"[Changes in the Expression of AKT and ERK after the JSRV-Env-Induced Transfection of TC-1 and TC-1-Hyal2 Cells].","date":"2016","source":"Bing du xue bao = Chinese journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/29962199","citation_count":0,"is_preprint":false},{"pmid":"41674174","id":"PMC_41674174","title":"Evaluation of the Effects of Newcastle Disease Virus as an Oncolytic Virus on the Expression of Apoptosis-related Genes in TC-1 Cell Line.","date":"2026","source":"Iranian journal of allergy, asthma, and immunology","url":"https://pubmed.ncbi.nlm.nih.gov/41674174","citation_count":0,"is_preprint":false},{"pmid":"31183361","id":"PMC_31183361","title":"The Dosage of the Derivative of Clostridium Ghonii (DCG) Spores Dictates Whether an IFNγ/IL-9 or a Strong IFNγ Response Is Elicited in TC-1 Tumour Bearing Mice.","date":"2019","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/31183361","citation_count":0,"is_preprint":false},{"pmid":"6291246","id":"PMC_6291246","title":"[Morphological, cytogenetic and proliferative characteristics of Syrian hamster HTC-2 and HTC-1 cells and of the HTCT tumor cell line transformed by herpes simplex type 2 virus].","date":"1982","source":"Voprosy virusologii","url":"https://pubmed.ncbi.nlm.nih.gov/6291246","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.24.25332010","title":"A Bibliometric Analysis of Preprints in Traditional, Complementary, and Integrative Medicine Research","date":"2025-07-25","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.24.25332010","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.27.645250","title":"The SRG RAT® supports human cell xenotransplantation through enhanced tumor microenvironment interactions","date":"2025-04-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.27.645250","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.07.647544","title":"FLASH radiotherapy spares lymphocytes in tumor-draining lymph nodes and increases infiltration of immune cells in tumors","date":"2025-04-11","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.07.647544","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46603,"output_tokens":4745,"usd":0.105492,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12951,"output_tokens":4325,"usd":0.08644,"stage2_stop_reason":"end_turn"},"total_usd":0.191932,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"TC-1 (C8orf4) was cloned as a novel gene overexpressed in papillary thyroid carcinoma; the full-length mRNA encodes a 106-amino-acid protein that is ubiquitously expressed in human tissues, localizes to chromosome 8p11.2, and three regulatory motifs were identified in its 5' flanking sequence.\",\n      \"method\": \"Suppression subtractive hybridization, RT-PCR, Northern analysis, 5'-RACE, primer extension, fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal molecular methods in a single foundational cloning study, single lab\",\n      \"pmids\": [\"11056052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TC-1 (C8orf4) protein is monomeric and predominantly unstructured (natively disordered) at physiological salt and pH. Recombinant TC-1 can be phosphorylated in vitro by cyclic AMP-dependent protein kinase (PKA) and protein kinase C (PKC), and stable transfection of TC-1 into normal thyroid cells upregulates the activity of both kinases while conferring increased proliferation, anchorage-independent growth, and reduced apoptosis.\",\n      \"method\": \"Recombinant protein expression, in vitro kinase assay, stable transfection of normal thyroid cells, soft-agar colony formation, apoptosis assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase reconstitution combined with structural characterization (natively disordered) and functional cellular loss-of-function/gain-of-function, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15087392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TC1 (C8orf4) functions as a positive regulator of the Wnt/β-catenin pathway by directly interacting with Chibby (Cby), a nuclear antagonist of β-catenin-mediated transcription. TC1 binding to Cby relieves its inhibitory effect, enhancing β-catenin target gene expression (including MMP-7, MMP-14, laminin γ2). Upon co-expression, TC1 redistributes from nucleolus to nuclear speckles where it co-localizes with Cby.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by immunofluorescence, β-catenin reporter assay, RT-PCR for target genes, mammalian cell transfection\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, co-localization, and reporter assay in the same study; replicated in follow-up studies across multiple cancer types\",\n      \"pmids\": [\"16424001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TC1 (C8orf4) expression correlates with Wnt/β-catenin target genes (laminin γ2, MMP-7, MMP-14, cyclin D1, c-Met, CD44) in gastric cancer tissue; overexpression in MKN45 cells enhances Matrigel invasiveness and proliferation, and TC1 expression increases after serial peritoneal seeding in nude mice.\",\n      \"method\": \"Tissue microarray with IHC, Matrigel invasion assay, proliferation assay, serial in vivo peritoneal seeding\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional in vitro assays plus in vivo model, single lab; no direct mechanistic reconstitution beyond pathway correlation\",\n      \"pmids\": [\"16740781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TC1 (C8orf4) is upregulated by pro-inflammatory cytokines IL-1β and TNF-α in follicular dendritic cells (FDC-like HK line) and enhances their proliferation; TC1 knockdown inhibits IL-1β-induced proliferation, placing TC1 downstream of these cytokines in FDC proliferation regulation.\",\n      \"method\": \"RT-PCR, siRNA knockdown, cell proliferation assay in HK cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean knockdown with specific proliferative phenotype, single lab, single cell type\",\n      \"pmids\": [\"16730711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NMR spectroscopy showed that TC-1 is intrinsically disordered but adopts compact conformations with three regions of high helical propensity (D44–R53, K58–A64, D73–T88) in its C-terminal portion. Upon addition of Chibby, significant resonance broadening from these helical regions indicates that TC-1 interacts with Cby through its transient helical structure.\",\n      \"method\": \"NMR spectroscopy (15N-labeled protein), chemical shift analysis, relaxation measurements, titration with Cby\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure determination with functional binding validation, orthogonal to Co-IP data from another lab\",\n      \"pmids\": [\"17905836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TC1 (C8orf4) is upregulated by heat shock and other cellular stresses (H2O2, TPA, LPS, UV), and upon upregulation TC1 protein translocates into the nucleus independently of NF-κB activation. TC1 upregulates heat shock proteins, TC1 knockdown inhibits stress-induced downstream regulation, and TC1 and HSF1 mutually upregulate each other, suggesting a positive feedback loop in heat shock response.\",\n      \"method\": \"qRT-PCR, Western blot, immunofluorescence for nuclear translocation, siRNA knockdown, reporter/expression analysis in multiple cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — nuclear translocation directly observed by imaging plus knockdown phenotype, single lab with multiple cell lines\",\n      \"pmids\": [\"17603013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TC-1 overexpression in human mammary epithelial (HME) cells confers anchorage-independent and growth-factor-independent proliferation. TC-1 expression is downregulated by the FGFR inhibitor PD173074 in FGFR2-amplified SUM-52 breast cancer cells, and forced FGFR2 expression in HME cells increases endogenous TC-1 mRNA, placing TC-1 downstream of FGFR2 signaling.\",\n      \"method\": \"Stable transfection, soft-agar colony formation, pharmacological inhibition (PD173074), forced FGFR2 expression, RT-PCR\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic epistasis linking FGFR2 to TC-1, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"17520678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TC1 (C8orf4) mRNA is upregulated by mitogens (FBS/thrombin) at least partially via the ERK1/2 signaling pathway. Overexpression of TC1 promotes G1-to-S phase transition and significantly increases cyclin D1 promoter-driven luciferase activity; this effect is delayed when ERK1/2 signaling is deficient.\",\n      \"method\": \"qRT-PCR, ERK1/2 pathway inhibition, flow cytometry cell-cycle analysis, cyclin D1 promoter luciferase reporter assay\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter plus cell-cycle analysis plus epistasis with ERK1/2, single lab\",\n      \"pmids\": [\"18959821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TC1 (C8orf4) is upregulated by IL-1β, TNF-α, LPS, and phorbol ester in human aortic endothelial cells and umbilical vein endothelial cells, and this upregulation is blocked by IκB-kinase inhibitors. TC1 overexpression upregulates inflammatory mediators (IL-6, IL-1α, COX-2, CXCL1, CCL2, CCL5, IL-8, ICAM1, VCAM1, E-selectin) and enhances nuclear translocation of RelA and NF-κB DNA-binding activity, suggesting TC1 amplifies NF-κB signaling via positive feedback. TC1 knockdown downregulates these inflammatory parameters. Zebrafish TC1 overexpression induces edema.\",\n      \"method\": \"Endothelial cell transfection/knockdown, ELISA, qRT-PCR, NF-κB nuclear translocation assay (immunofluorescence), EMSA (DNA-binding), monocyte adhesion assay, permeability assay, zebrafish overexpression\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with multiple orthogonal mechanistic readouts (NF-κB translocation, DNA binding, cytokine expression), replicated across two human endothelial cell types and zebrafish model\",\n      \"pmids\": [\"19684084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"C8orf4 is induced by TGF-β signaling in colon adenoma cells (Vaco 330) and is downregulated in metastatic colon cancer, placing it as a TGF-β-responsive gene that may participate in colon cell differentiation or growth regulation.\",\n      \"method\": \"Expression microarray, Northern analysis, real-time RT-PCR\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptional induction by TGF-β confirmed by multiple quantitative methods but no mechanistic follow-up (no promoter or pathway experiments); single lab\",\n      \"pmids\": [\"15185345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TC-1 (C8orf4) overexpression in A549 non-small cell lung cancer cells promotes proliferation, invasion, and migration, and increases expression of Wnt/β-catenin downstream genes (VEGF, MMP-7, cyclin D1, c-myc, survivin) at mRNA and protein levels; TC-1 knockdown has opposite effects.\",\n      \"method\": \"Lentiviral overexpression/knockdown, MTT assay, Matrigel invasion, scratch-wound assay, qRT-PCR, Western blot\",\n      \"journal\": \"The Journal of surgical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with pathway-level readouts, single lab\",\n      \"pmids\": [\"23880650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Human TC-1 (hTC-1/C8orf4) expressed heterologously in yeast functions as a pro-survival protein: it suppresses cell death and growth inhibition induced by copper sulfate and blocks the deleterious effects of over-expressed pro-apoptotic proteins (YCA1, YBH3, NUC1, AIF1). TC-1 orthologs are restricted to jawed vertebrates with no ortholog detected in yeast, confirming its vertebrate-specific origin.\",\n      \"method\": \"Heterologous expression of hTC-1 in Saccharomyces cerevisiae, growth/viability assays with copper and pro-apoptotic gene overexpression, bioinformatic ortholog analysis\",\n      \"journal\": \"Microbial cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue experiments in yeast across multiple death stimuli, single lab\",\n      \"pmids\": [\"28357300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"C8orf4 is hypermethylated and downregulated in fibrotic lung fibroblasts compared to controls. siRNA knockdown of C8orf4 in control fibroblasts downregulates COX-2 and PGE2 production, generating a fibrotic-like phenotype. Chromatin immunoprecipitation (ChIP) demonstrated that C8orf4 binds the proximal promoter of COX-2, establishing it as a direct transcriptional regulator of COX-2 expression.\",\n      \"method\": \"Bisulfite sequencing, methylation microarray, siRNA knockdown, ChIP assay, PGE2 ELISA, qRT-PCR, 5-aza-2'-deoxycytidine treatment\",\n      \"journal\": \"Clinical science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP directly demonstrates promoter binding, combined with functional siRNA knockdown and epigenetic characterization, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26744410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tc1-knockout (Tc1-/-) mice show adipose tissue hyperplasia with smaller, more numerous adipocytes, enhanced glucose tolerance, and reduced serum lipids. Adipocyte-derived stem cells (ADSCs) from Tc1-/- mice display enhanced proliferative and adipogenic capacity; PPARγ and CEBPα are robustly upregulated upon adipogenic induction, while Wisp2 and Dlk1 (adipogenesis inhibitors) are downregulated. TC1-transfected NIH3T3 cells show higher β-catenin reporter activity, linking canonical Wnt signaling to Tc1-dependent adipose regulation.\",\n      \"method\": \"Tc1 knockout mouse model, histomorphometry, glucose tolerance test, serum lipid measurement, ADSC isolation and differentiation, qRT-PCR, β-catenin reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple defined metabolic and cellular phenotypes, mechanistic link to β-catenin signaling confirmed by reporter assay, single lab\",\n      \"pmids\": [\"27775060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TC-1 knockdown combined with radiation inhibits proliferation and induces apoptosis in NSCLC A549 cells more effectively than either treatment alone, and this is associated with inactivation of Wnt/β-catenin signaling; the Wnt/β-catenin inhibitor XAV939 phenocopies TC-1 knockdown, confirming epistasis. Combined TC-1 siRNA and radiation also caused significant tumor regression in A549 xenografts.\",\n      \"method\": \"siRNA knockdown, MTT assay, flow cytometry, Western blot for β-catenin pathway, XAV939 pharmacological inhibition, xenograft model\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological epistasis confirming pathway placement, single lab\",\n      \"pmids\": [\"27029901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In human adipose-derived mesenchymal stem cells (hADSCs), miR-30a directly binds the 3'-UTR of C8orf4 to inhibit its expression (validated by luciferase reporter assay). The lncRNA H19 acts as a competing endogenous RNA (ceRNA) for miR-30a, thereby augmenting C8orf4 expression and promoting adipogenic differentiation. H19 knockdown suppresses C8orf4 expression and adipogenesis, which can be partially reversed by miR-30a inhibition.\",\n      \"method\": \"TargetScan prediction, luciferase reporter gene assay (3'-UTR binding), miRNA/lncRNA overexpression and knockdown, qRT-PCR, Western blot, adipogenic differentiation assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'-UTR binding validated by luciferase reporter plus epistasis rescue experiment, single lab\",\n      \"pmids\": [\"31026067\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TCIM (TC-1/C8orf4) is a 106-residue vertebrate-specific, intrinsically disordered protein that functions as a positive regulator of the Wnt/β-catenin pathway by binding Chibby (via C-terminal transient helical regions) and relieving Chibby's antagonism of β-catenin-mediated transcription; it can be phosphorylated by PKA and PKC, amplifies NF-κB signaling via positive feedback in endothelial cells, directly binds and activates the COX-2 promoter in fibroblasts, is regulated downstream of FGFR2 and ERK1/2 to promote G1-to-S cell-cycle transition through cyclin D1 upregulation, and acts as a pro-survival factor whose deletion in mice leads to adipose hyperplasia with enhanced adipogenic stem cell activity linked to canonical Wnt signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TCIM (TC-1/C8orf4) is a vertebrate-specific, intrinsically disordered 106-residue signaling adaptor that acts as a stress- and mitogen-inducible amplifier of proliferative, inflammatory, and pro-survival programs [#0, #1, #9]. Its central mechanistic role is positive regulation of Wnt/\\u03b2-catenin signaling: it directly binds Chibby, a nuclear antagonist of \\u03b2-catenin-mediated transcription, relieving Chibby's inhibition and enhancing expression of \\u03b2-catenin target genes, with co-expression redistributing TCIM from the nucleolus to nuclear speckles where it colocalizes with Chibby [#2]. NMR analysis establishes that although TCIM is natively disordered, it carries three C-terminal regions of high helical propensity that mediate the Chibby interaction through transient helical structure [#5]. Beyond the Wnt axis, TCIM is induced by pro-inflammatory cytokines and cellular stress and acts within positive-feedback loops: it amplifies NF-\\u03baB signaling in endothelial cells by promoting RelA nuclear translocation and DNA binding and inducing inflammatory mediators [#9], participates in a mutual-upregulation loop with HSF1 in the heat shock response [#6], and binds directly to the COX-2 proximal promoter to drive COX-2/PGE2 expression in fibroblasts [#13]. TCIM is positioned downstream of FGFR2 and ERK1/2 mitogenic signaling, where it promotes the G1-to-S transition through cyclin D1 induction [#7, #8], and functions as a pro-survival factor that suppresses multiple death stimuli [#12]. In vivo, Tc1-knockout mice develop adipose hyperplasia with enhanced adipogenic stem-cell activity linked to canonical Wnt signaling [#14], and C8orf4 expression is itself tuned post-transcriptionally by a miR-30a/H19 ceRNA axis during adipogenesis [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing that TCIM is a discrete, ubiquitously expressed gene overexpressed in thyroid carcinoma framed it as a candidate proliferation-associated factor rather than an artifact.\",\n      \"evidence\": \"Suppression subtractive hybridization, RACE, Northern, and FISH cloning of C8orf4 from papillary thyroid carcinoma\",\n      \"pmids\": [\"11056052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No protein-level function assigned at cloning\", \"Regulatory motifs identified but not functionally tested\", \"Disease association correlative, not causal\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Biophysical and cellular characterization answered what kind of protein TCIM is, showing it is monomeric and natively disordered, is a PKA/PKC substrate, and confers transformation-associated phenotypes.\",\n      \"evidence\": \"Recombinant protein structural assessment, in vitro kinase assays, and stable transfection of normal thyroid cells\",\n      \"pmids\": [\"15087392\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of PKA/PKC phosphorylation not mapped to sites\", \"Mechanism linking disorder to kinase activation unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of C8orf4 as a TGF-\\u03b2-responsive gene downregulated in metastatic colon cancer hinted at context-dependent regulation but provided no mechanism.\",\n      \"evidence\": \"Expression microarray, Northern, and real-time RT-PCR in colon adenoma cells\",\n      \"pmids\": [\"15185345\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No promoter or pathway experiments performed\", \"Correlative expression only\", \"Direction of regulation differs from oncogenic contexts, unexplained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery of the direct Chibby interaction defined TCIM's core molecular mechanism as a relief of Wnt/\\u03b2-catenin antagonism, transforming it from a correlated marker into a pathway regulator.\",\n      \"evidence\": \"Reciprocal Co-IP, immunofluorescence colocalization, and \\u03b2-catenin reporter/target-gene assays in mammalian cells; correlative invasion/proliferation data in gastric cancer\",\n      \"pmids\": [\"16424001\", \"16740781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and affinity of TCIM\\u2013Chibby binding not quantified here\", \"Whether displacement of Chibby is direct competition or allosteric unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"NMR resolved how a disordered protein achieves specific binding, localizing the Chibby interaction to three transient C-terminal helical regions.\",\n      \"evidence\": \"15N NMR spectroscopy, chemical shift and relaxation analysis, and titration with Chibby\",\n      \"pmids\": [\"17905836\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No bound-state complex structure\", \"Helical residues not mutated to confirm necessity for function\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Stress and FGFR2 epistasis experiments placed TCIM in inducible upstream signaling, showing it translocates to the nucleus upon stress, feeds back on HSF1, and lies downstream of FGFR2.\",\n      \"evidence\": \"qRT-PCR, immunofluorescence nuclear-translocation, siRNA knockdown across cell lines; pharmacological FGFR inhibition and forced FGFR2 expression with soft-agar assays\",\n      \"pmids\": [\"17603013\", \"17520678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear import mechanism unknown\", \"HSF1 feedback shown by mutual upregulation but not direct interaction\", \"Intermediate steps between FGFR2 and TCIM induction undefined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linking TCIM to ERK1/2-driven cyclin D1 induction explained how its mitogenic upregulation translates into cell-cycle progression.\",\n      \"evidence\": \"qRT-PCR, ERK1/2 inhibition, flow-cytometry cell-cycle analysis, and cyclin D1 promoter luciferase reporter\",\n      \"pmids\": [\"18959821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TCIM acts directly on the cyclin D1 promoter or via \\u03b2-catenin not distinguished\", \"ERK1/2-to-TCIM link epistatic, not biochemical\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reciprocal gain/loss-of-function in endothelial cells established TCIM as an NF-\\u03baB amplifier acting through a positive-feedback loop, broadening its role into inflammation.\",\n      \"evidence\": \"Endothelial transfection/knockdown, ELISA, qRT-PCR, NF-\\u03baB translocation imaging, EMSA, adhesion/permeability assays, and zebrafish overexpression\",\n      \"pmids\": [\"19684084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of TCIM within the NF-\\u03baB cascade not identified\", \"Direct binding partner mediating RelA effects unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reciprocal modulation in lung cancer cells reinforced the TCIM\\u2013Wnt/\\u03b2-catenin link in a new tumor context.\",\n      \"evidence\": \"Lentiviral overexpression/knockdown with MTT, invasion, migration assays, qRT-PCR and Western blot of Wnt targets in A549 cells\",\n      \"pmids\": [\"23880650\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pathway readouts correlative, no direct mechanistic test\", \"Does not separate Wnt from NF-\\u03baB contributions\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Heterologous yeast expression provided a clean test of intrinsic pro-survival activity and confirmed TCIM's vertebrate-specific origin.\",\n      \"evidence\": \"Expression of human TC-1 in S. cerevisiae with copper and pro-apoptotic gene challenge plus bioinformatic ortholog analysis\",\n      \"pmids\": [\"28357300\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast lacks Chibby/Wnt machinery, so mechanism of survival in this system unidentified\", \"Relevance to mammalian apoptosis pathways inferred\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"ChIP demonstrated TCIM is a direct transcriptional regulator of COX-2, and a knockout mouse plus radiation epistasis defined its in vivo physiological roles and confirmed Wnt dependence.\",\n      \"evidence\": \"ChIP, siRNA, PGE2 ELISA and methylation analysis in fibroblasts; Tc1-/- mouse phenotyping with \\u03b2-catenin reporter; siRNA+XAV939 epistasis and xenografts\",\n      \"pmids\": [\"26744410\", \"27775060\", \"27029901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a disordered protein binds the COX-2 promoter (direct DNA contact vs adaptor) unresolved\", \"Tissue specificity of Wnt-dependent phenotypes not fully mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining a miR-30a/H19 ceRNA axis explained how C8orf4 levels are set post-transcriptionally during adipogenic differentiation.\",\n      \"evidence\": \"TargetScan, 3'-UTR luciferase reporter, miRNA/lncRNA over/knockdown rescue, and adipogenic differentiation assays in hADSCs\",\n      \"pmids\": [\"31026067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Other regulators of C8orf4 mRNA stability not surveyed\", \"Connection between this axis and downstream Wnt/PPAR\\u03b3 program inferred\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical basis by which a single disordered protein integrates Wnt, NF-\\u03baB, HSF1, and COX-2 outputs\\u2014and whether phosphorylation switches between these activities\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of TCIM bound to any partner other than NMR-mapped Chibby helices\", \"Functional role of PKA/PKC phosphorylation sites uncharacterized\", \"Whether COX-2 promoter occupancy reflects direct DNA binding or recruitment is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 9]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [6, 7, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 6, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 9, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 9]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [6, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CBY1\", \"HSF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}