{"gene":"CNOT12","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2002,"finding":"TAB182 (TNKS1BP1/CNOT12) binds to tankyrase 1 via the ankyrin repeat domain of tankyrase 1, specifically to three of the five ankyrin repeat clusters, and serves as an acceptor of poly(ADP-ribosyl)ation by tankyrase 1 in vitro.","method":"Co-immunoprecipitation from human cells, in vitro poly(ADP-ribosyl)ation assay, domain-deletion binding analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reciprocal Co-IP from cells plus in vitro enzymatic assay, replicated across two independent papers (PMID:11854288 and PMID:12080061)","pmids":["11854288","12080061"],"is_preprint":false},{"year":2002,"finding":"TAB182 contains an RXXPDG motif that mediates its binding to tankyrases; this same motif is shared by IRAP and human TRF1 and is required for tankyrase interaction.","method":"Motif analysis combined with yeast two-hybrid and mutagenesis-based binding experiments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — motif identified by mutagenesis/yeast two-hybrid in a single study with multiple binding partners tested as controls","pmids":["12080061"],"is_preprint":false},{"year":2002,"finding":"TAB182 localizes to the nucleus in a heterochromatic staining pattern and to the cytoplasm where it co-stains with the cortical actin network, as determined by immunofluorescence.","method":"Immunofluorescence/subcellular localization imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct imaging experiment, single lab, replicated in subsequent work on actin function","pmids":["11854288"],"is_preprint":false},{"year":2015,"finding":"TNKS1BP1 interacts with DNA-PKcs and PARP-1, promotes their association, and facilitates DNA-PKcs autophosphorylation at Ser2056 in a PARP-1-dependent manner, contributing to DNA double-strand break repair.","method":"Co-immunoprecipitation, overexpression/knockdown with DSB repair assays (neutral comet, PFGE, γH2AX foci), PARP inhibitor epistasis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional epistasis with PARP-1 inhibitor, single lab with multiple orthogonal methods","pmids":["25749521"],"is_preprint":false},{"year":2017,"finding":"TNKS1BP1 colocalizes with actin filaments, binds the actin-capping protein CapZA2, and negatively regulates cell invasion; TNKS1BP1 depletion dissociates CapZA2 from the cytoskeleton, activates the ROCK/LIMK/cofilin pathway, and enhances cell invasion.","method":"Co-immunoprecipitation/pulldown, siRNA knockdown, immunofluorescence colocalization, invasion assays, western blot of ROCK/LIMK/cofilin pathway","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying CapZA2, clean KD with defined pathway readout (ROCK/LIMK/cofilin phosphorylation), multiple orthogonal methods in single rigorous study","pmids":["28202517"],"is_preprint":false},{"year":2021,"finding":"TAB182 interacts with FHL2 and through this interaction induces G2-M checkpoint arrest by activating the CHK2/CDC25C/CDC2 signaling pathway, thereby promoting radioresistance.","method":"Co-immunoprecipitation followed by mass spectrometry identification of FHL2, flow cytometry for cell cycle, western blot for CHK2/CDC25C/CDC2, shRNA rescue experiments","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS for interaction, functional rescue with shRNA-resistant TAB182, single lab","pmids":["33787085"],"is_preprint":false},{"year":2022,"finding":"TAB182 interacts with β-catenin, prevents its phosphorylation by GSK3β, and recruits FHL2 to promote β-catenin nuclear translocation and activation of downstream transcriptional targets in esophageal squamous cell carcinoma cells.","method":"RNA-seq, co-immunoprecipitation/mass spectrometry (IP-MS), knockdown/overexpression with proliferation and invasion assays, in vivo tumorigenicity assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS and Co-IP identifying interaction with β-catenin and FHL2, supported by functional knockdown data, single lab","pmids":["36289198"],"is_preprint":false},{"year":2024,"finding":"TNKS1BP1 interacts with TRIM21 and mediates ubiquitination of CNOT4 at lysine K239 via K48 and K6 linkages, leading to CNOT4 degradation that inhibits autophagy and promotes lipid accumulation by suppressing the JAK2/STAT3 pathway in hepatocellular carcinoma.","method":"Co-immunoprecipitation identifying TNKS1BP1–TRIM21–CNOT4 complex, ubiquitination site mapping (K239), knockdown/overexpression with autophagy and lipid accumulation assays, JAK2/STAT3 pathway western blot","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination mapping with site specificity, supported by functional pathway assays, single lab","pmids":["39019859"],"is_preprint":false},{"year":2024,"finding":"TAB182 regulates glycolysis and lactate production by activating LDHA transcription through transcription factors SP1 and c-MYC; knockdown of TAB182 reduces lactate production, reverses radiation-induced metabolic changes, and enhances tumor radiosensitivity in vivo.","method":"Proteomic/transcriptomic analysis, LDHA transcription reporter assays, SP1/c-MYC co-immunoprecipitation or ChIP-based analysis, metabolite measurements, xenograft radiotherapy model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transcriptional mechanism with SP1/c-MYC, in vivo xenograft validation, single lab with multiple orthogonal methods","pmids":["38480704"],"is_preprint":false},{"year":2024,"finding":"In response to ionizing radiation, elevated TNKS1BP1 interacts with and decreases CNOT4 protein levels to suppress EEF2 degradation, causing EEF2 accumulation that drives type II alveolar epithelial cell senescence and radiation-induced lung injury; TNKS1BP1 knockout mice are protected from this injury.","method":"Co-immunoprecipitation (TNKS1BP1–CNOT4 interaction), TNKS1BP1 knockout mouse model, cellular senescence assays, EEF2 overexpression rescue, SASP measurement","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying CNOT4 interaction, in vivo KO mouse model with defined phenotype, EEF2 rescue experiment, single lab","pmids":["39113018"],"is_preprint":false},{"year":2017,"finding":"TNKS1BP1 overexpression increases accumulation of S-phase cells and inhibits RAD51 foci formation, implicating it in regulation of homologous recombination repair of DNA double-strand breaks.","method":"Flow cytometry (cell cycle), RAD51 foci immunofluorescence, TNKS1BP1 overexpression/knockdown in cancer cells treated with DNA-damaging agents","journal":"Cancer medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect readout (RAD51 foci), no direct interaction partner identified for HR pathway","pmids":["28058814"],"is_preprint":false},{"year":2023,"finding":"TAB182 regulates EGFR expression at the mRNA and protein levels in NSCLC cells; silencing TAB182 decreases EGFR, and EGFR overexpression rescues the inhibitory effects of TAB182 knockdown on EMT, migration, and invasion, placing TAB182 upstream of EGFR in this pathway.","method":"Stable TAB182 knockdown, RT-qPCR and western blot for EGFR, EGFR rescue overexpression, EMT/migration/invasion assays","journal":"Molecular biology reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single cell line, mechanism of EGFR regulation not defined beyond expression correlation with rescue","pmids":["36689051"],"is_preprint":false}],"current_model":"CNOT12/TNKS1BP1/TAB182 is a multi-functional scaffold protein that was originally identified as a tankyrase 1-binding protein (via an RXXPDG motif) and poly(ADP-ribosyl)ation acceptor; it localizes to actin filaments and the nucleus, where it regulates actin dynamics and cell invasion by binding CapZA2 and gating the ROCK/LIMK/cofilin pathway, participates in DNA double-strand break repair by promoting PARP-1–DNA-PKcs association and DNA-PKcs autophosphorylation, modulates the G2-M checkpoint and β-catenin nuclear translocation through interaction with FHL2, facilitates CNOT4 ubiquitination via TRIM21 to affect autophagy and JAK2/STAT3 signaling, and controls LDHA-driven glycolysis through SP1/c-MYC transcription factors, collectively indicating it acts as a context-dependent regulatory hub at the intersection of DNA damage response, cytoskeletal organization, and metabolic reprogramming."},"narrative":{"mechanistic_narrative":"CNOT12/TNKS1BP1/TAB182 is a multi-functional scaffold protein that operates as a context-dependent regulatory hub linking the DNA damage response, cytoskeletal organization, and metabolic reprogramming [PMID:11854288, PMID:12080061, PMID:28202517]. It was originally defined as a tankyrase 1-binding protein that docks onto the ankyrin repeat clusters of tankyrase 1 through an RXXPDG motif and serves as an acceptor of tankyrase-mediated poly(ADP-ribosyl)ation [PMID:11854288, PMID:12080061], and it distributes between a heterochromatic nuclear pool and a cortical actin-associated cytoplasmic pool [PMID:11854288]. At the cytoskeleton it binds the actin-capping protein CapZA2 and restrains the ROCK/LIMK/cofilin pathway, so that its loss releases CapZA2, activates this pathway, and enhances cell invasion [PMID:28202517]. In the DNA damage response it promotes the association of PARP-1 with DNA-PKcs and drives DNA-PKcs autophosphorylation at Ser2056 in a PARP-1-dependent manner to support double-strand break repair [PMID:25749521], and through interaction with FHL2 it enforces a CHK2/CDC25C/CDC2-dependent G2-M checkpoint that confers radioresistance [PMID:33787085]. The same FHL2 partnership is co-opted to stabilize and shuttle β-catenin into the nucleus by blocking GSK3β-mediated phosphorylation [PMID:36289198]. As part of a TRIM21-containing complex it directs ubiquitination of CNOT4, and by lowering CNOT4 levels it modulates autophagy, lipid accumulation, and EEF2-driven cellular senescence [PMID:39019859, PMID:39113018]. It additionally reprograms metabolism by activating LDHA transcription via SP1 and c-MYC to sustain glycolysis and lactate production [PMID:38480704].","teleology":[{"year":2002,"claim":"Established the founding molecular identity of the protein by showing it physically engages tankyrase 1 and is itself a substrate of tankyrase-mediated poly(ADP-ribosyl)ation, defining it as a PARsylation acceptor in the tankyrase axis.","evidence":"Co-immunoprecipitation, in vitro poly(ADP-ribosyl)ation assay, and domain-deletion mapping to tankyrase 1 ankyrin repeats in human cells","pmids":["11854288","12080061"],"confidence":"High","gaps":["Functional consequence of being PARsylated not defined","Cellular conditions governing the tankyrase interaction unresolved"]},{"year":2002,"claim":"Defined the binding determinant by identifying an RXXPDG motif shared with IRAP and TRF1 as the structural basis for tankyrase recognition.","evidence":"Yeast two-hybrid and mutagenesis-based binding experiments with motif analysis","pmids":["12080061"],"confidence":"Medium","gaps":["Structural detail of the motif-ankyrin interface not resolved","Single study"]},{"year":2002,"claim":"Resolved the dual subcellular distribution, placing the protein both in heterochromatin and at the cortical actin network and hinting at distinct nuclear versus cytoskeletal functions.","evidence":"Immunofluorescence subcellular localization imaging in human cells","pmids":["11854288"],"confidence":"Medium","gaps":["Determinants of partitioning between pools unknown","Single lab"]},{"year":2015,"claim":"Connected the protein to double-strand break repair by showing it bridges PARP-1 and DNA-PKcs to promote DNA-PKcs autophosphorylation.","evidence":"Co-immunoprecipitation, knockdown/overexpression DSB repair assays (comet, PFGE, γH2AX), and PARP inhibitor epistasis","pmids":["25749521"],"confidence":"Medium","gaps":["Direct vs indirect bridging not distinguished","Whether it acts in NHEJ exclusively unresolved","Single lab"]},{"year":2017,"claim":"Defined a cytoskeletal regulatory function in which the protein anchors CapZA2 and gates the ROCK/LIMK/cofilin pathway to suppress invasion.","evidence":"Reciprocal Co-IP identifying CapZA2, siRNA knockdown, colocalization imaging, invasion assays, and pathway western blots","pmids":["28202517"],"confidence":"High","gaps":["Mechanism linking CapZA2 release to ROCK activation not defined","Whether tankyrase or nuclear roles intersect with this function unknown"]},{"year":2017,"claim":"Extended the DNA repair link to homologous recombination by associating the protein with S-phase accumulation and suppressed RAD51 foci.","evidence":"Flow cytometry and RAD51 foci immunofluorescence after overexpression/knockdown in DNA-damaged cancer cells","pmids":["28058814"],"confidence":"Low","gaps":["Indirect RAD51 readout with no HR interaction partner identified","Causality versus cell-cycle bias not separated"]},{"year":2021,"claim":"Identified FHL2 as a partner mediating a CHK2/CDC25C/CDC2 G2-M checkpoint arrest that underlies radioresistance.","evidence":"Co-IP/mass spectrometry, flow cytometry, checkpoint pathway western blots, and shRNA rescue","pmids":["33787085"],"confidence":"Medium","gaps":["Direct enzymatic step in checkpoint activation undefined","Single lab"]},{"year":2022,"claim":"Showed the protein reuses the FHL2 interaction to stabilize β-catenin by blocking GSK3β phosphorylation and promote its nuclear translocation.","evidence":"RNA-seq, IP-MS/Co-IP, knockdown/overexpression proliferation and invasion assays, and in vivo tumorigenicity in esophageal carcinoma","pmids":["36289198"],"confidence":"Medium","gaps":["How it shields β-catenin from GSK3β mechanistically unclear","Single tumor context"]},{"year":2024,"claim":"Placed the protein in a TRIM21 ubiquitin ligase complex targeting CNOT4 for K48/K6-linked degradation, controlling autophagy and lipid accumulation via JAK2/STAT3.","evidence":"Co-IP of TNKS1BP1–TRIM21–CNOT4, ubiquitination site mapping (K239), functional autophagy/lipid assays, and pathway western blots in hepatocellular carcinoma","pmids":["39019859"],"confidence":"Medium","gaps":["Whether it directly recruits TRIM21 or acts as substrate adaptor unresolved","Single lab"]},{"year":2024,"claim":"Demonstrated an in vivo physiological consequence of CNOT4 regulation: radiation-induced TNKS1BP1 lowers CNOT4 to stabilize EEF2, driving alveolar senescence and lung injury, with knockout mice protected.","evidence":"Co-IP, TNKS1BP1 knockout mouse model, senescence/SASP assays, and EEF2 overexpression rescue","pmids":["39113018"],"confidence":"Medium","gaps":["Reconciliation of CNOT4-degradation versus EEF2-stabilization arms across tissues unclear","Single lab"]},{"year":2024,"claim":"Identified a metabolic reprogramming role through transcriptional activation of LDHA via SP1 and c-MYC, linking the protein to glycolytic flux and radiosensitivity.","evidence":"Proteomic/transcriptomic profiling, LDHA reporter assays, SP1/c-MYC Co-IP/ChIP, metabolite measurements, and xenograft radiotherapy model","pmids":["38480704"],"confidence":"Medium","gaps":["Whether the protein binds DNA directly or only via SP1/c-MYC unknown","Single lab"]},{"year":2023,"claim":"Linked the protein to EGFR expression and EMT in lung cancer, positioning it upstream of EGFR-driven migration and invasion.","evidence":"Stable knockdown, RT-qPCR/western blot for EGFR, EGFR rescue, and EMT/migration/invasion assays in NSCLC","pmids":["36689051"],"confidence":"Low","gaps":["Mechanism of EGFR regulation undefined beyond expression correlation","Single cell line"]},{"year":null,"claim":"How the protein's biochemical activities are unified is still open: it is unclear whether its scaffold function is intrinsic or whether tankyrase-mediated PARsylation switches it among its cytoskeletal, DNA-repair, transcriptional, and ubiquitin-ligase-adaptor roles.","evidence":"No timeline study integrates the PARsylation, scaffold, and degradation-adaptor functions into a single regulatory mechanism","pmids":[],"confidence":"Low","gaps":["No structural model of the full-length protein or its domain architecture","No demonstration that one role regulates another","Switch governing nuclear vs cytoplasmic function unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[8]}],"complexes":["TNKS1BP1–TRIM21–CNOT4 ubiquitination complex"],"partners":["TNKS","PARP1","PRKDC","CAPZA2","FHL2","CTNNB1","TRIM21","CNOT4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"TNKS1BP1","url":"https://depmap.org/portal/gene/TNKS1BP1","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CNOT12","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"TNKS1BP1","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TNKS1BP1"},"hgnc":{"alias_symbol":["TAB182","KIAA1741","FLJ45975"],"prev_symbol":["TNKS1BP1"]},"alphafold":{},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNOT12","jax_strain_url":"https://www.jax.org/strain/search?query=CNOT12"},"sequence":{}},"corpus_meta":[{"pmid":"12080061","id":"PMC_12080061","title":"Identification of a tankyrase-binding motif shared by IRAP, TAB182, and human TRF1 but not mouse TRF1. NuMA contains this RXXPDG motif and is a novel tankyrase partner.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12080061","citation_count":131,"is_preprint":false},{"pmid":"11854288","id":"PMC_11854288","title":"The telomeric poly(ADP-ribose) polymerase, tankyrase 1, contains multiple binding sites for telomeric repeat binding factor 1 (TRF1) and a novel acceptor, 182-kDa tankyrase-binding protein (TAB182).","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11854288","citation_count":130,"is_preprint":false},{"pmid":"28202517","id":"PMC_28202517","title":"Tankyrase-Binding Protein TNKS1BP1 Regulates Actin Cytoskeleton Rearrangement and Cancer Cell Invasion.","date":"2017","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/28202517","citation_count":36,"is_preprint":false},{"pmid":"25749521","id":"PMC_25749521","title":"TNKS1BP1 functions in DNA double-strand break repair though facilitating DNA-PKcs autophosphorylation dependent on PARP-1.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/25749521","citation_count":32,"is_preprint":false},{"pmid":"33011533","id":"PMC_33011533","title":"TCF3-activated FAM201A enhances cell proliferation and invasion via miR-186-5p/TNKS1BP1 axis in triple-negative breast cancer.","date":"2020","source":"Bioorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33011533","citation_count":20,"is_preprint":false},{"pmid":"28058814","id":"PMC_28058814","title":"Overexpression of TNKS1BP1 in lung cancers and its involvement in homologous recombination pathway of DNA double-strand breaks.","date":"2017","source":"Cancer medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28058814","citation_count":20,"is_preprint":false},{"pmid":"33787085","id":"PMC_33787085","title":"Elevated TAB182 enhances the radioresistance of esophageal squamous cell carcinoma through G2-M checkpoint modulation.","date":"2021","source":"Cancer medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33787085","citation_count":16,"is_preprint":false},{"pmid":"38480704","id":"PMC_38480704","title":"TAB182 regulates glycolytic metabolism by controlling LDHA transcription to impact tumor radiosensitivity.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/38480704","citation_count":13,"is_preprint":false},{"pmid":"39019859","id":"PMC_39019859","title":"TNKS1BP1 facilitates ubiquitination of CNOT4 by TRIM21 to promote hepatocellular carcinoma progression and immune evasion.","date":"2024","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/39019859","citation_count":12,"is_preprint":false},{"pmid":"36289198","id":"PMC_36289198","title":"TAB182 aggravates progression of esophageal squamous cell carcinoma by enhancing β-catenin nuclear translocation through FHL2 dependent manner.","date":"2022","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/36289198","citation_count":12,"is_preprint":false},{"pmid":"39113018","id":"PMC_39113018","title":"TNKS1BP1 mediates AECII senescence and radiation induced lung injury through suppressing EEF2 degradation.","date":"2024","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/39113018","citation_count":8,"is_preprint":false},{"pmid":"36689051","id":"PMC_36689051","title":"Silencing TAB182 inhibits cell EMT, migration and invasion by downregulating EGFR in A549 NSCLC cells.","date":"2023","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/36689051","citation_count":6,"is_preprint":false},{"pmid":"37953246","id":"PMC_37953246","title":"Downregulation of TAB182 promotes cancer stem-like cell properties and therapeutic resistance in triple-negative breast cancer cells.","date":"2023","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/37953246","citation_count":5,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8392,"output_tokens":2970,"usd":0.034863,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10378,"output_tokens":4058,"usd":0.07667,"stage2_stop_reason":"end_turn"},"total_usd":0.111533,"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\": 2002,\n      \"finding\": \"TAB182 (TNKS1BP1/CNOT12) binds to tankyrase 1 via the ankyrin repeat domain of tankyrase 1, specifically to three of the five ankyrin repeat clusters, and serves as an acceptor of poly(ADP-ribosyl)ation by tankyrase 1 in vitro.\",\n      \"method\": \"Co-immunoprecipitation from human cells, in vitro poly(ADP-ribosyl)ation assay, domain-deletion binding analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reciprocal Co-IP from cells plus in vitro enzymatic assay, replicated across two independent papers (PMID:11854288 and PMID:12080061)\",\n      \"pmids\": [\"11854288\", \"12080061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAB182 contains an RXXPDG motif that mediates its binding to tankyrases; this same motif is shared by IRAP and human TRF1 and is required for tankyrase interaction.\",\n      \"method\": \"Motif analysis combined with yeast two-hybrid and mutagenesis-based binding experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — motif identified by mutagenesis/yeast two-hybrid in a single study with multiple binding partners tested as controls\",\n      \"pmids\": [\"12080061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAB182 localizes to the nucleus in a heterochromatic staining pattern and to the cytoplasm where it co-stains with the cortical actin network, as determined by immunofluorescence.\",\n      \"method\": \"Immunofluorescence/subcellular localization imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct imaging experiment, single lab, replicated in subsequent work on actin function\",\n      \"pmids\": [\"11854288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TNKS1BP1 interacts with DNA-PKcs and PARP-1, promotes their association, and facilitates DNA-PKcs autophosphorylation at Ser2056 in a PARP-1-dependent manner, contributing to DNA double-strand break repair.\",\n      \"method\": \"Co-immunoprecipitation, overexpression/knockdown with DSB repair assays (neutral comet, PFGE, γH2AX foci), PARP inhibitor epistasis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional epistasis with PARP-1 inhibitor, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25749521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TNKS1BP1 colocalizes with actin filaments, binds the actin-capping protein CapZA2, and negatively regulates cell invasion; TNKS1BP1 depletion dissociates CapZA2 from the cytoskeleton, activates the ROCK/LIMK/cofilin pathway, and enhances cell invasion.\",\n      \"method\": \"Co-immunoprecipitation/pulldown, siRNA knockdown, immunofluorescence colocalization, invasion assays, western blot of ROCK/LIMK/cofilin pathway\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying CapZA2, clean KD with defined pathway readout (ROCK/LIMK/cofilin phosphorylation), multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"28202517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TAB182 interacts with FHL2 and through this interaction induces G2-M checkpoint arrest by activating the CHK2/CDC25C/CDC2 signaling pathway, thereby promoting radioresistance.\",\n      \"method\": \"Co-immunoprecipitation followed by mass spectrometry identification of FHL2, flow cytometry for cell cycle, western blot for CHK2/CDC25C/CDC2, shRNA rescue experiments\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS for interaction, functional rescue with shRNA-resistant TAB182, single lab\",\n      \"pmids\": [\"33787085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TAB182 interacts with β-catenin, prevents its phosphorylation by GSK3β, and recruits FHL2 to promote β-catenin nuclear translocation and activation of downstream transcriptional targets in esophageal squamous cell carcinoma cells.\",\n      \"method\": \"RNA-seq, co-immunoprecipitation/mass spectrometry (IP-MS), knockdown/overexpression with proliferation and invasion assays, in vivo tumorigenicity assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS and Co-IP identifying interaction with β-catenin and FHL2, supported by functional knockdown data, single lab\",\n      \"pmids\": [\"36289198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TNKS1BP1 interacts with TRIM21 and mediates ubiquitination of CNOT4 at lysine K239 via K48 and K6 linkages, leading to CNOT4 degradation that inhibits autophagy and promotes lipid accumulation by suppressing the JAK2/STAT3 pathway in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation identifying TNKS1BP1–TRIM21–CNOT4 complex, ubiquitination site mapping (K239), knockdown/overexpression with autophagy and lipid accumulation assays, JAK2/STAT3 pathway western blot\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination mapping with site specificity, supported by functional pathway assays, single lab\",\n      \"pmids\": [\"39019859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAB182 regulates glycolysis and lactate production by activating LDHA transcription through transcription factors SP1 and c-MYC; knockdown of TAB182 reduces lactate production, reverses radiation-induced metabolic changes, and enhances tumor radiosensitivity in vivo.\",\n      \"method\": \"Proteomic/transcriptomic analysis, LDHA transcription reporter assays, SP1/c-MYC co-immunoprecipitation or ChIP-based analysis, metabolite measurements, xenograft radiotherapy model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptional mechanism with SP1/c-MYC, in vivo xenograft validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"38480704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In response to ionizing radiation, elevated TNKS1BP1 interacts with and decreases CNOT4 protein levels to suppress EEF2 degradation, causing EEF2 accumulation that drives type II alveolar epithelial cell senescence and radiation-induced lung injury; TNKS1BP1 knockout mice are protected from this injury.\",\n      \"method\": \"Co-immunoprecipitation (TNKS1BP1–CNOT4 interaction), TNKS1BP1 knockout mouse model, cellular senescence assays, EEF2 overexpression rescue, SASP measurement\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying CNOT4 interaction, in vivo KO mouse model with defined phenotype, EEF2 rescue experiment, single lab\",\n      \"pmids\": [\"39113018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TNKS1BP1 overexpression increases accumulation of S-phase cells and inhibits RAD51 foci formation, implicating it in regulation of homologous recombination repair of DNA double-strand breaks.\",\n      \"method\": \"Flow cytometry (cell cycle), RAD51 foci immunofluorescence, TNKS1BP1 overexpression/knockdown in cancer cells treated with DNA-damaging agents\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect readout (RAD51 foci), no direct interaction partner identified for HR pathway\",\n      \"pmids\": [\"28058814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAB182 regulates EGFR expression at the mRNA and protein levels in NSCLC cells; silencing TAB182 decreases EGFR, and EGFR overexpression rescues the inhibitory effects of TAB182 knockdown on EMT, migration, and invasion, placing TAB182 upstream of EGFR in this pathway.\",\n      \"method\": \"Stable TAB182 knockdown, RT-qPCR and western blot for EGFR, EGFR rescue overexpression, EMT/migration/invasion assays\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single cell line, mechanism of EGFR regulation not defined beyond expression correlation with rescue\",\n      \"pmids\": [\"36689051\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNOT12/TNKS1BP1/TAB182 is a multi-functional scaffold protein that was originally identified as a tankyrase 1-binding protein (via an RXXPDG motif) and poly(ADP-ribosyl)ation acceptor; it localizes to actin filaments and the nucleus, where it regulates actin dynamics and cell invasion by binding CapZA2 and gating the ROCK/LIMK/cofilin pathway, participates in DNA double-strand break repair by promoting PARP-1–DNA-PKcs association and DNA-PKcs autophosphorylation, modulates the G2-M checkpoint and β-catenin nuclear translocation through interaction with FHL2, facilitates CNOT4 ubiquitination via TRIM21 to affect autophagy and JAK2/STAT3 signaling, and controls LDHA-driven glycolysis through SP1/c-MYC transcription factors, collectively indicating it acts as a context-dependent regulatory hub at the intersection of DNA damage response, cytoskeletal organization, and metabolic reprogramming.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CNOT12/TNKS1BP1/TAB182 is a multi-functional scaffold protein that operates as a context-dependent regulatory hub linking the DNA damage response, cytoskeletal organization, and metabolic reprogramming [#0, #4]. It was originally defined as a tankyrase 1-binding protein that docks onto the ankyrin repeat clusters of tankyrase 1 through an RXXPDG motif and serves as an acceptor of tankyrase-mediated poly(ADP-ribosyl)ation [#0, #1], and it distributes between a heterochromatic nuclear pool and a cortical actin-associated cytoplasmic pool [#2]. At the cytoskeleton it binds the actin-capping protein CapZA2 and restrains the ROCK/LIMK/cofilin pathway, so that its loss releases CapZA2, activates this pathway, and enhances cell invasion [#4]. In the DNA damage response it promotes the association of PARP-1 with DNA-PKcs and drives DNA-PKcs autophosphorylation at Ser2056 in a PARP-1-dependent manner to support double-strand break repair [#3], and through interaction with FHL2 it enforces a CHK2/CDC25C/CDC2-dependent G2-M checkpoint that confers radioresistance [#5]. The same FHL2 partnership is co-opted to stabilize and shuttle \\u03b2-catenin into the nucleus by blocking GSK3\\u03b2-mediated phosphorylation [#6]. As part of a TRIM21-containing complex it directs ubiquitination of CNOT4, and by lowering CNOT4 levels it modulates autophagy, lipid accumulation, and EEF2-driven cellular senescence [#7, #9]. It additionally reprograms metabolism by activating LDHA transcription via SP1 and c-MYC to sustain glycolysis and lactate production [#8].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the founding molecular identity of the protein by showing it physically engages tankyrase 1 and is itself a substrate of tankyrase-mediated poly(ADP-ribosyl)ation, defining it as a PARsylation acceptor in the tankyrase axis.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro poly(ADP-ribosyl)ation assay, and domain-deletion mapping to tankyrase 1 ankyrin repeats in human cells\",\n      \"pmids\": [\"11854288\", \"12080061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of being PARsylated not defined\", \"Cellular conditions governing the tankyrase interaction unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the binding determinant by identifying an RXXPDG motif shared with IRAP and TRF1 as the structural basis for tankyrase recognition.\",\n      \"evidence\": \"Yeast two-hybrid and mutagenesis-based binding experiments with motif analysis\",\n      \"pmids\": [\"12080061\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural detail of the motif-ankyrin interface not resolved\", \"Single study\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved the dual subcellular distribution, placing the protein both in heterochromatin and at the cortical actin network and hinting at distinct nuclear versus cytoskeletal functions.\",\n      \"evidence\": \"Immunofluorescence subcellular localization imaging in human cells\",\n      \"pmids\": [\"11854288\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of partitioning between pools unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected the protein to double-strand break repair by showing it bridges PARP-1 and DNA-PKcs to promote DNA-PKcs autophosphorylation.\",\n      \"evidence\": \"Co-immunoprecipitation, knockdown/overexpression DSB repair assays (comet, PFGE, \\u03b3H2AX), and PARP inhibitor epistasis\",\n      \"pmids\": [\"25749521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect bridging not distinguished\", \"Whether it acts in NHEJ exclusively unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a cytoskeletal regulatory function in which the protein anchors CapZA2 and gates the ROCK/LIMK/cofilin pathway to suppress invasion.\",\n      \"evidence\": \"Reciprocal Co-IP identifying CapZA2, siRNA knockdown, colocalization imaging, invasion assays, and pathway western blots\",\n      \"pmids\": [\"28202517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking CapZA2 release to ROCK activation not defined\", \"Whether tankyrase or nuclear roles intersect with this function unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the DNA repair link to homologous recombination by associating the protein with S-phase accumulation and suppressed RAD51 foci.\",\n      \"evidence\": \"Flow cytometry and RAD51 foci immunofluorescence after overexpression/knockdown in DNA-damaged cancer cells\",\n      \"pmids\": [\"28058814\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Indirect RAD51 readout with no HR interaction partner identified\", \"Causality versus cell-cycle bias not separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified FHL2 as a partner mediating a CHK2/CDC25C/CDC2 G2-M checkpoint arrest that underlies radioresistance.\",\n      \"evidence\": \"Co-IP/mass spectrometry, flow cytometry, checkpoint pathway western blots, and shRNA rescue\",\n      \"pmids\": [\"33787085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic step in checkpoint activation undefined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed the protein reuses the FHL2 interaction to stabilize \\u03b2-catenin by blocking GSK3\\u03b2 phosphorylation and promote its nuclear translocation.\",\n      \"evidence\": \"RNA-seq, IP-MS/Co-IP, knockdown/overexpression proliferation and invasion assays, and in vivo tumorigenicity in esophageal carcinoma\",\n      \"pmids\": [\"36289198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How it shields \\u03b2-catenin from GSK3\\u03b2 mechanistically unclear\", \"Single tumor context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed the protein in a TRIM21 ubiquitin ligase complex targeting CNOT4 for K48/K6-linked degradation, controlling autophagy and lipid accumulation via JAK2/STAT3.\",\n      \"evidence\": \"Co-IP of TNKS1BP1\\u2013TRIM21\\u2013CNOT4, ubiquitination site mapping (K239), functional autophagy/lipid assays, and pathway western blots in hepatocellular carcinoma\",\n      \"pmids\": [\"39019859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether it directly recruits TRIM21 or acts as substrate adaptor unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated an in vivo physiological consequence of CNOT4 regulation: radiation-induced TNKS1BP1 lowers CNOT4 to stabilize EEF2, driving alveolar senescence and lung injury, with knockout mice protected.\",\n      \"evidence\": \"Co-IP, TNKS1BP1 knockout mouse model, senescence/SASP assays, and EEF2 overexpression rescue\",\n      \"pmids\": [\"39113018\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of CNOT4-degradation versus EEF2-stabilization arms across tissues unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a metabolic reprogramming role through transcriptional activation of LDHA via SP1 and c-MYC, linking the protein to glycolytic flux and radiosensitivity.\",\n      \"evidence\": \"Proteomic/transcriptomic profiling, LDHA reporter assays, SP1/c-MYC Co-IP/ChIP, metabolite measurements, and xenograft radiotherapy model\",\n      \"pmids\": [\"38480704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the protein binds DNA directly or only via SP1/c-MYC unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked the protein to EGFR expression and EMT in lung cancer, positioning it upstream of EGFR-driven migration and invasion.\",\n      \"evidence\": \"Stable knockdown, RT-qPCR/western blot for EGFR, EGFR rescue, and EMT/migration/invasion assays in NSCLC\",\n      \"pmids\": [\"36689051\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanism of EGFR regulation undefined beyond expression correlation\", \"Single cell line\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the protein's biochemical activities are unified is still open: it is unclear whether its scaffold function is intrinsic or whether tankyrase-mediated PARsylation switches it among its cytoskeletal, DNA-repair, transcriptional, and ubiquitin-ligase-adaptor roles.\",\n      \"evidence\": \"No timeline study integrates the PARsylation, scaffold, and degradation-adaptor functions into a single regulatory mechanism\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the full-length protein or its domain architecture\", \"No demonstration that one role regulates another\", \"Switch governing nuclear vs cytoplasmic function unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"TNKS1BP1\\u2013TRIM21\\u2013CNOT4 ubiquitination complex\"\n    ],\n    \"partners\": [\n      \"TNKS\",\n      \"PARP1\",\n      \"PRKDC\",\n      \"CAPZA2\",\n      \"FHL2\",\n      \"CTNNB1\",\n      \"TRIM21\",\n      \"CNOT4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}