{"gene":"TCF25","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2018,"finding":"TCF25 (an RQC component) ensures preferential formation of K48-ubiquitin linkage on nascent chains ubiquitinated by the E3 ligase Listerin in the ribosome-associated quality control (RQC) pathway, as determined in reconstituted mammalian RQC assays.","method":"In vitro biochemical reconstitution of mammalian RQC pathway with purified components; ubiquitin linkage analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined components, single lab but mechanistically specific result with direct biochemical readout","pmids":["30244831"],"is_preprint":false},{"year":2025,"finding":"TCF25 imposes K48-linkage specificity on Listerin-mediated ubiquitination by directly interacting with both the RING domain of Listerin and the acceptor ubiquitin (UbA), orienting UbA so that its K48 is positioned to attack the thioester bond of the Ube2D1~Ub conjugate. TCF25 itself also undergoes K48-specific ubiquitination by Listerin, suggesting a mechanism for its own proteasomal degradation.","method":"Functional biochemical studies (in vitro ubiquitination assays, binding studies), AlphaFold3 structural modeling, mutagenesis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with functional assays, structural modeling with mutagenesis, and multiple orthogonal methods in a single rigorous study; replicated from preprint (PMID:39464025)","pmids":["40169231","39464025"],"is_preprint":false},{"year":2006,"finding":"Human NULP1 (TCF25) acts as a transcriptional repressor when fused to a GAL4 DNA-binding domain; the C-terminal DUF654 domain mediates the basal transcriptional repressive activity through increased deacetylase activity at the promoter (relieved by trichostatin A treatment). Overexpression of NULP1 inhibits the transcriptional activity of serum response factor (SRF) in COS-7 cells.","method":"GAL4-fusion transcriptional repression assay; co-transfection with VP-16; trichostatin A treatment; SRF transcriptional activity reporter assay in COS-7 cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional transcription assays with domain mapping and pharmacological intervention, single lab, two orthogonal reporter approaches","pmids":["16574069"],"is_preprint":false},{"year":2002,"finding":"Mouse Nulp1 (TCF25 ortholog) protein localizes to the nucleus when expressed as an EGFP fusion in human embryonic kidney cells, consistent with its predicted role as a transcription factor. The protein contains a bHLH domain and an acidic amino-terminal region.","method":"Transient transfection of Nulp1-EGFP fusion in HEK cells; fluorescence microscopy; Northern blotting; in situ hybridization","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct live-cell imaging for nuclear localization, replicated in two cell types, single lab","pmids":["12107429"],"is_preprint":false},{"year":2007,"finding":"Nulp1 (TCF25) overexpression induces cell death with DNA fragmentation in human osteosarcoma Saos2 cells and sensitizes mouse N2A neuroblastoma cells to staurosporine-induced death. Nulp1 physically binds the X-linked inhibitor of apoptosis protein (XIAP), and this interaction is increased during cell death.","method":"Overexpression in Saos2 and N2A cells; cell death/proliferation assays; co-immunoprecipitation with XIAP; immunostaining with novel antibody for subcellular localization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP plus phenotypic assays, single lab, two cell lines tested","pmids":["18068114"],"is_preprint":false},{"year":2020,"finding":"NULP1 (TCF25) directly interacts with the topologically associating domain (TAD) of NFAT3 via its C-terminal region, suppressing NFAT3 transcriptional activity. Nulp1 knockout exacerbates aortic banding-induced cardiac hypertrophy in mice, which is rescued by transgenic Nulp1 overexpression, and in vivo inactivation of the NFAT pathway with VIVIT peptides rescues the aggravated hypertrophy from Nulp1 deficiency.","method":"Co-immunoprecipitation; genetic knockout and transgenic overexpression in mice; aortic banding model; VIVIT peptide treatment in vivo; transcriptional reporter assays; immunoblot and immunostaining","journal":"Journal of the American Heart Association","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying binding domain, KO/transgenic rescue in vivo with defined phenotypic readout, pharmacological epistasis, multiple orthogonal methods","pmids":["32805187"],"is_preprint":false},{"year":2022,"finding":"NDST1 upregulation reduces NULP1 (TCF25) expression in cardiomyocytes, and NULP1 overexpression reverses the pro-hypertrophic, pro-apoptotic, and pro-inflammatory effects of NDST1 overexpression in vitro, including modulation of AKT phosphorylation.","method":"In vitro cardiomyocyte experiments; NDST1 inhibition/overexpression; cell viability, apoptosis, and hypertrophy assays; NULP1 overexpression rescue","journal":"General physiology and biophysics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single set of cell-based assays with no direct mechanistic link established between NDST1 and NULP1 at molecular level","pmids":["36222339"],"is_preprint":false},{"year":2024,"finding":"TCF25 protein levels are substantially lower than predicted from its mRNA levels in mammalian cells due to post-translational proteasomal degradation, demonstrated experimentally in cell culture.","method":"High-throughput public dataset analysis; experimental proteasome inhibition assays in cell culture to demonstrate proteasomal degradation of TCF25 protein","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct experimental demonstration of proteasomal degradation using inhibitor treatment, single lab, corroborated by the mechanistic finding in PMID:40169231 that TCF25 is ubiquitinated by Listerin","pmids":["38228636"],"is_preprint":false},{"year":2025,"finding":"TCF25 enhances lysosomal acidification by targeting V-ATPase, promoting autophagy and ATP generation under glucose starvation. Prolonged glucose starvation constitutively activates ferritinophagy via TCF25, increasing lysosomal membrane permeability (LMP) and leading to lysosome-dependent cell death (LDCD). Knockout of TCF25 or V-ATPase components prevents this cell death, and TCF25 deficiency protects mice from hepatic ischemia-reperfusion injury.","method":"Genome-wide CRISPR-Cas9 screen; TCF25 knockout cells; lysosomal acidification assays; autophagy and ferritinophagy assays; LMP measurement; V-ATPase functional studies; mouse hepatic ischemia-reperfusion injury model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen followed by mechanistic validation with KO, in vivo rescue, and multiple orthogonal biochemical readouts in single rigorous study","pmids":["40844875"],"is_preprint":false},{"year":2018,"finding":"Drosophila Nulp1 (dNulp1, ortholog of TCF25) is essential for femur development and survival; CRISPR/Cas9 knockout of the DUF654 domain causes bent femurs and partial lethality rescued by overexpression. dNulp1 acts as a positive cofactor in the canonical Wnt/Wingless signaling pathway: dNulp1 overexpression suppresses notch wing phenotype from sgg/GSK3β overexpression, activates the TopFlash Wnt reporter, and dNulp1 knockout downregulates seven Wg target genes and upregulates two Wg-negative targets.","method":"CRISPR/Cas9 knockout in Drosophila; phenotypic rescue by overexpression; qRT-PCR of Wg target genes; TopFlash luciferase reporter assay","journal":"Current molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with rescue, reporter assay and gene expression analysis, single lab, Drosophila ortholog","pmids":["29437009"],"is_preprint":false}],"current_model":"TCF25 (NULP1/Rqc1) is a multifunctional nuclear protein that operates as a key specificity factor in the ribosome-associated quality control (RQC) pathway by directly binding the RING domain of the E3 ligase Listerin and the acceptor ubiquitin to orient K48-linkage formation on stalled nascent chains; it also functions as a bHLH transcriptional repressor (suppressing SRF and NFAT3 signaling), a lysosomal/nutrient sensor that promotes V-ATPase-dependent lysosomal acidification, autophagy, and ferritinophagy under glucose starvation, and a regulator of cell death through interaction with XIAP—with TCF25 protein itself subject to K48-specific proteasomal degradation via Listerin."},"narrative":{"mechanistic_narrative":"TCF25 (also NULP1/Rqc1) is a multifunctional protein best defined as a specificity factor in ribosome-associated quality control (RQC), where it directs the topology of ubiquitin chains assembled on stalled nascent polypeptides [PMID:30244831]. It enforces K48-linkage specificity on Listerin-mediated ubiquitination by binding both the RING domain of Listerin and the acceptor ubiquitin, orienting the acceptor so that its K48 attacks the incoming Ube2D1~Ub conjugate; TCF25 is itself a K48-ubiquitination substrate of Listerin, accounting for the observation that its protein levels are held well below those predicted from mRNA through proteasomal degradation [PMID:40169231, PMID:39464025, PMID:38228636]. Independently, TCF25 acts as a nuclear transcriptional repressor: its C-terminal DUF654 domain confers basal repression through promoter deacetylase activity and inhibits serum response factor signaling [PMID:16574069, PMID:12107429], and it binds the transactivation domain of NFAT3 to suppress NFAT-driven transcription, a function that restrains pressure-overload cardiac hypertrophy in vivo [PMID:32805187]. TCF25 also serves as a lysosomal nutrient-sensing effector that promotes V-ATPase-dependent lysosomal acidification, autophagy, and ferritinophagy under glucose starvation, driving lysosome-dependent cell death and contributing to hepatic ischemia-reperfusion injury [PMID:40844875]. It additionally binds XIAP and can promote cell death [PMID:18068114]. The reconciliation of its cytoplasmic RQC/lysosomal roles with its reported nuclear transcriptional repressor activity is not resolved in the available corpus.","teleology":[{"year":2002,"claim":"Established the basic cellular identity of the protein by showing it is nuclear and harbors a bHLH domain, framing it as a candidate transcription factor.","evidence":"EGFP-fusion live-cell imaging plus Northern blot and in situ hybridization for the mouse ortholog Nulp1","pmids":["12107429"],"confidence":"Medium","gaps":["No direct DNA-binding or target gene demonstrated","Single lab, ortholog-based"]},{"year":2006,"claim":"Demonstrated that the protein has intrinsic transcriptional repressor activity and mapped it to the C-terminal DUF654 domain acting via promoter deacetylation, answering how it influences transcription.","evidence":"GAL4-fusion repression assay, VP-16 co-transfection, trichostatin A reversal, and SRF reporter assay in COS-7 cells","pmids":["16574069"],"confidence":"Medium","gaps":["Deacetylase partner not identified","Direct genomic targets unknown","Repression shown only in artificial GAL4 context plus SRF reporter"]},{"year":2007,"claim":"Linked the protein to cell death regulation by identifying a physical interaction with XIAP and a death-promoting phenotype, opening an apoptosis-related function.","evidence":"Overexpression death/sensitization assays in Saos2 and N2A cells with XIAP co-immunoprecipitation","pmids":["18068114"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation","Binding domain not mapped","Mechanism linking XIAP binding to death unresolved"]},{"year":2018,"claim":"Defined a distinct molecular role: that TCF25 enforces preferential K48 ubiquitin linkage on Listerin-ubiquitinated nascent chains in RQC.","evidence":"In vitro reconstitution of the mammalian RQC pathway with purified components and ubiquitin linkage analysis","pmids":["30244831"],"confidence":"High","gaps":["Molecular basis of linkage specificity not yet structural","Relationship to its nuclear functions unaddressed"]},{"year":2018,"claim":"Showed the function is conserved and developmentally essential, placing the DUF654 domain in Wnt/Wingless signaling via genetic loss-of-function.","evidence":"CRISPR/Cas9 DUF654 knockout in Drosophila with overexpression rescue, TopFlash reporter, and Wg target gene qRT-PCR","pmids":["29437009"],"confidence":"Medium","gaps":["Direct molecular partner in Wnt pathway not identified","Conservation of Wnt role in mammals untested","Ortholog-based"]},{"year":2020,"claim":"Identified a physiological transcriptional target and disease context by showing TCF25 binds NFAT3 and restrains cardiac hypertrophy in vivo.","evidence":"Reciprocal Co-IP with domain mapping, mouse knockout/transgenic rescue in an aortic banding model, and VIVIT peptide pharmacological epistasis","pmids":["32805187"],"confidence":"High","gaps":["Whether repression occurs at the genome or by cytoplasmic NFAT sequestration not distinguished","Connection to RQC role unclear"]},{"year":2022,"claim":"Positioned TCF25 downstream of NDST1 in cardiomyocyte stress responses, suggesting regulatory control of its expression.","evidence":"In vitro cardiomyocyte NDST1 overexpression/inhibition with NULP1 rescue and AKT phosphorylation readouts","pmids":["36222339"],"confidence":"Low","gaps":["No direct molecular link between NDST1 and NULP1 established","Cell-based only, single lab"]},{"year":2024,"claim":"Explained the discrepancy between TCF25 mRNA and protein abundance by demonstrating constitutive proteasomal degradation.","evidence":"Public dataset analysis with experimental proteasome inhibition in cell culture","pmids":["38228636"],"confidence":"Medium","gaps":["Responsible E3 ligase not identified in this study","Degron not mapped"]},{"year":2025,"claim":"Resolved the structural mechanism of RQC linkage specificity and connected TCF25 turnover to its own pathway by showing it binds Listerin RING and acceptor ubiquitin and is itself a Listerin K48 substrate.","evidence":"In vitro ubiquitination and binding assays, AlphaFold3 modeling, and mutagenesis (replicated from preprint)","pmids":["40169231","39464025"],"confidence":"High","gaps":["Experimental high-resolution structure absent","Whether Listerin autoregulates TCF25 in cells not directly shown"]},{"year":2025,"claim":"Revealed a lysosomal nutrient-sensing function in which TCF25 drives V-ATPase-dependent acidification, ferritinophagy, and lysosome-dependent cell death with in vivo pathological relevance.","evidence":"Genome-wide CRISPR screen, TCF25 and V-ATPase knockout, lysosomal/autophagy/ferritinophagy assays, and mouse hepatic ischemia-reperfusion model","pmids":["40844875"],"confidence":"High","gaps":["Direct molecular interaction with V-ATPase not demonstrated","Whether this requires nuclear or RQC functions unknown"]},{"year":null,"claim":"How a single protein integrates cytoplasmic RQC ubiquitin-chain editing, lysosomal acidification control, and nuclear transcriptional repression — and whether these reflect distinct pools or a shared mechanism — remains unresolved.","evidence":"No single study reconciles the RQC, lysosomal, and transcriptional activities","pmids":[],"confidence":"Low","gaps":["No study addresses subcellular partitioning across the three roles","No unifying biochemical activity proposed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,5,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,7]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[4,8]}],"complexes":[],"partners":["LTN1","UBE2D1","NFAT3","XIAP","SRF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BQ70","full_name":"Ribosome quality control complex subunit TCF25","aliases":["Nuclear localized protein 1","Transcription factor 25","TCF-25"],"length_aa":676,"mass_kda":76.7,"function":"Component of the ribosome quality control complex (RQC), a ribosome-associated complex that mediates ubiquitination and extraction of incompletely synthesized nascent chains for proteasomal degradation (PubMed:30244831). In the RQC complex, required to promote formation of 'Lys-48'-linked polyubiquitin chains during ubiquitination of incompletely synthesized proteins by LTN1 (PubMed:30244831). May negatively regulate the calcineurin-NFAT signaling cascade by suppressing the activity of transcription factor NFATC4 (By similarity). May play a role in cell death control (By similarity)","subcellular_location":"Nucleus; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q9BQ70/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TCF25","classification":"Not Classified","n_dependent_lines":31,"n_total_lines":1208,"dependency_fraction":0.02566225165562914},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000141002","cell_line_id":"CID001826","localizations":[{"compartment":"cytoplasmic","grade":3}],"interactors":[{"gene":"GPRASP2","stoichiometry":10.0},{"gene":"RBM14","stoichiometry":0.2},{"gene":"USP9X","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001826","total_profiled":1310},"omim":[{"mim_id":"621047","title":"PEPTIDYL-tRNA HYDROLASE 1; PTRH1","url":"https://www.omim.org/entry/621047"},{"mim_id":"617541","title":"ANKYRIN REPEAT- AND ZINC FINGER DOMAIN-CONTAINING 1; ANKZF1","url":"https://www.omim.org/entry/617541"},{"mim_id":"612326","title":"TRANSCRIPTION FACTOR 25; TCF25","url":"https://www.omim.org/entry/612326"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TCF25"},"hgnc":{"alias_symbol":["Nulp1","KIAA1049"],"prev_symbol":[]},"alphafold":{"accession":"Q9BQ70","domains":[{"cath_id":"-","chopping":"177-199_217-380_591-597_641-653","consensus_level":"medium","plddt":89.7825,"start":177,"end":653},{"cath_id":"-","chopping":"381-588","consensus_level":"medium","plddt":91.8959,"start":381,"end":588}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BQ70","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BQ70-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BQ70-F1-predicted_aligned_error_v6.png","plddt_mean":72.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TCF25","jax_strain_url":"https://www.jax.org/strain/search?query=TCF25"},"sequence":{"accession":"Q9BQ70","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BQ70.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BQ70/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BQ70"}},"corpus_meta":[{"pmid":"30244831","id":"PMC_30244831","title":"Release 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nutrient sensor to orchestrate metabolic adaptation and cell death by enhancing lysosomal acidification under glucose starvation.","date":"2025","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/40844875","citation_count":0,"is_preprint":false},{"pmid":"42083421","id":"PMC_42083421","title":"Genomewide signatures revealing new evidence for selection of important traits in indigenous cattle breeds of Tamil Nadu, India.","date":"2026","source":"Journal of genetics","url":"https://pubmed.ncbi.nlm.nih.gov/42083421","citation_count":0,"is_preprint":false},{"pmid":"41385958","id":"PMC_41385958","title":"Unraveling the population genetic structure and identifying candidate genes for dorsal plumage color in Liangshan Yanying chickens.","date":"2025","source":"Poultry science","url":"https://pubmed.ncbi.nlm.nih.gov/41385958","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21074,"output_tokens":2859,"usd":0.053054,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10079,"output_tokens":3374,"usd":0.067373,"stage2_stop_reason":"end_turn"},"total_usd":0.120427,"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\": 2018,\n      \"finding\": \"TCF25 (an RQC component) ensures preferential formation of K48-ubiquitin linkage on nascent chains ubiquitinated by the E3 ligase Listerin in the ribosome-associated quality control (RQC) pathway, as determined in reconstituted mammalian RQC assays.\",\n      \"method\": \"In vitro biochemical reconstitution of mammalian RQC pathway with purified components; ubiquitin linkage analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined components, single lab but mechanistically specific result with direct biochemical readout\",\n      \"pmids\": [\"30244831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TCF25 imposes K48-linkage specificity on Listerin-mediated ubiquitination by directly interacting with both the RING domain of Listerin and the acceptor ubiquitin (UbA), orienting UbA so that its K48 is positioned to attack the thioester bond of the Ube2D1~Ub conjugate. TCF25 itself also undergoes K48-specific ubiquitination by Listerin, suggesting a mechanism for its own proteasomal degradation.\",\n      \"method\": \"Functional biochemical studies (in vitro ubiquitination assays, binding studies), AlphaFold3 structural modeling, mutagenesis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with functional assays, structural modeling with mutagenesis, and multiple orthogonal methods in a single rigorous study; replicated from preprint (PMID:39464025)\",\n      \"pmids\": [\"40169231\", \"39464025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human NULP1 (TCF25) acts as a transcriptional repressor when fused to a GAL4 DNA-binding domain; the C-terminal DUF654 domain mediates the basal transcriptional repressive activity through increased deacetylase activity at the promoter (relieved by trichostatin A treatment). Overexpression of NULP1 inhibits the transcriptional activity of serum response factor (SRF) in COS-7 cells.\",\n      \"method\": \"GAL4-fusion transcriptional repression assay; co-transfection with VP-16; trichostatin A treatment; SRF transcriptional activity reporter assay in COS-7 cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional transcription assays with domain mapping and pharmacological intervention, single lab, two orthogonal reporter approaches\",\n      \"pmids\": [\"16574069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Mouse Nulp1 (TCF25 ortholog) protein localizes to the nucleus when expressed as an EGFP fusion in human embryonic kidney cells, consistent with its predicted role as a transcription factor. The protein contains a bHLH domain and an acidic amino-terminal region.\",\n      \"method\": \"Transient transfection of Nulp1-EGFP fusion in HEK cells; fluorescence microscopy; Northern blotting; in situ hybridization\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct live-cell imaging for nuclear localization, replicated in two cell types, single lab\",\n      \"pmids\": [\"12107429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nulp1 (TCF25) overexpression induces cell death with DNA fragmentation in human osteosarcoma Saos2 cells and sensitizes mouse N2A neuroblastoma cells to staurosporine-induced death. Nulp1 physically binds the X-linked inhibitor of apoptosis protein (XIAP), and this interaction is increased during cell death.\",\n      \"method\": \"Overexpression in Saos2 and N2A cells; cell death/proliferation assays; co-immunoprecipitation with XIAP; immunostaining with novel antibody for subcellular localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP plus phenotypic assays, single lab, two cell lines tested\",\n      \"pmids\": [\"18068114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NULP1 (TCF25) directly interacts with the topologically associating domain (TAD) of NFAT3 via its C-terminal region, suppressing NFAT3 transcriptional activity. Nulp1 knockout exacerbates aortic banding-induced cardiac hypertrophy in mice, which is rescued by transgenic Nulp1 overexpression, and in vivo inactivation of the NFAT pathway with VIVIT peptides rescues the aggravated hypertrophy from Nulp1 deficiency.\",\n      \"method\": \"Co-immunoprecipitation; genetic knockout and transgenic overexpression in mice; aortic banding model; VIVIT peptide treatment in vivo; transcriptional reporter assays; immunoblot and immunostaining\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying binding domain, KO/transgenic rescue in vivo with defined phenotypic readout, pharmacological epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"32805187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NDST1 upregulation reduces NULP1 (TCF25) expression in cardiomyocytes, and NULP1 overexpression reverses the pro-hypertrophic, pro-apoptotic, and pro-inflammatory effects of NDST1 overexpression in vitro, including modulation of AKT phosphorylation.\",\n      \"method\": \"In vitro cardiomyocyte experiments; NDST1 inhibition/overexpression; cell viability, apoptosis, and hypertrophy assays; NULP1 overexpression rescue\",\n      \"journal\": \"General physiology and biophysics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single set of cell-based assays with no direct mechanistic link established between NDST1 and NULP1 at molecular level\",\n      \"pmids\": [\"36222339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TCF25 protein levels are substantially lower than predicted from its mRNA levels in mammalian cells due to post-translational proteasomal degradation, demonstrated experimentally in cell culture.\",\n      \"method\": \"High-throughput public dataset analysis; experimental proteasome inhibition assays in cell culture to demonstrate proteasomal degradation of TCF25 protein\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct experimental demonstration of proteasomal degradation using inhibitor treatment, single lab, corroborated by the mechanistic finding in PMID:40169231 that TCF25 is ubiquitinated by Listerin\",\n      \"pmids\": [\"38228636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TCF25 enhances lysosomal acidification by targeting V-ATPase, promoting autophagy and ATP generation under glucose starvation. Prolonged glucose starvation constitutively activates ferritinophagy via TCF25, increasing lysosomal membrane permeability (LMP) and leading to lysosome-dependent cell death (LDCD). Knockout of TCF25 or V-ATPase components prevents this cell death, and TCF25 deficiency protects mice from hepatic ischemia-reperfusion injury.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 screen; TCF25 knockout cells; lysosomal acidification assays; autophagy and ferritinophagy assays; LMP measurement; V-ATPase functional studies; mouse hepatic ischemia-reperfusion injury model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen followed by mechanistic validation with KO, in vivo rescue, and multiple orthogonal biochemical readouts in single rigorous study\",\n      \"pmids\": [\"40844875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Drosophila Nulp1 (dNulp1, ortholog of TCF25) is essential for femur development and survival; CRISPR/Cas9 knockout of the DUF654 domain causes bent femurs and partial lethality rescued by overexpression. dNulp1 acts as a positive cofactor in the canonical Wnt/Wingless signaling pathway: dNulp1 overexpression suppresses notch wing phenotype from sgg/GSK3β overexpression, activates the TopFlash Wnt reporter, and dNulp1 knockout downregulates seven Wg target genes and upregulates two Wg-negative targets.\",\n      \"method\": \"CRISPR/Cas9 knockout in Drosophila; phenotypic rescue by overexpression; qRT-PCR of Wg target genes; TopFlash luciferase reporter assay\",\n      \"journal\": \"Current molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with rescue, reporter assay and gene expression analysis, single lab, Drosophila ortholog\",\n      \"pmids\": [\"29437009\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TCF25 (NULP1/Rqc1) is a multifunctional nuclear protein that operates as a key specificity factor in the ribosome-associated quality control (RQC) pathway by directly binding the RING domain of the E3 ligase Listerin and the acceptor ubiquitin to orient K48-linkage formation on stalled nascent chains; it also functions as a bHLH transcriptional repressor (suppressing SRF and NFAT3 signaling), a lysosomal/nutrient sensor that promotes V-ATPase-dependent lysosomal acidification, autophagy, and ferritinophagy under glucose starvation, and a regulator of cell death through interaction with XIAP—with TCF25 protein itself subject to K48-specific proteasomal degradation via Listerin.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TCF25 (also NULP1/Rqc1) is a multifunctional protein best defined as a specificity factor in ribosome-associated quality control (RQC), where it directs the topology of ubiquitin chains assembled on stalled nascent polypeptides [#0]. It enforces K48-linkage specificity on Listerin-mediated ubiquitination by binding both the RING domain of Listerin and the acceptor ubiquitin, orienting the acceptor so that its K48 attacks the incoming Ube2D1~Ub conjugate; TCF25 is itself a K48-ubiquitination substrate of Listerin, accounting for the observation that its protein levels are held well below those predicted from mRNA through proteasomal degradation [#1, #7]. Independently, TCF25 acts as a nuclear transcriptional repressor: its C-terminal DUF654 domain confers basal repression through promoter deacetylase activity and inhibits serum response factor signaling [#2, #3], and it binds the transactivation domain of NFAT3 to suppress NFAT-driven transcription, a function that restrains pressure-overload cardiac hypertrophy in vivo [#5]. TCF25 also serves as a lysosomal nutrient-sensing effector that promotes V-ATPase-dependent lysosomal acidification, autophagy, and ferritinophagy under glucose starvation, driving lysosome-dependent cell death and contributing to hepatic ischemia-reperfusion injury [#8]. It additionally binds XIAP and can promote cell death [#4]. The reconciliation of its cytoplasmic RQC/lysosomal roles with its reported nuclear transcriptional repressor activity is not resolved in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the basic cellular identity of the protein by showing it is nuclear and harbors a bHLH domain, framing it as a candidate transcription factor.\",\n      \"evidence\": \"EGFP-fusion live-cell imaging plus Northern blot and in situ hybridization for the mouse ortholog Nulp1\",\n      \"pmids\": [\"12107429\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct DNA-binding or target gene demonstrated\", \"Single lab, ortholog-based\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated that the protein has intrinsic transcriptional repressor activity and mapped it to the C-terminal DUF654 domain acting via promoter deacetylation, answering how it influences transcription.\",\n      \"evidence\": \"GAL4-fusion repression assay, VP-16 co-transfection, trichostatin A reversal, and SRF reporter assay in COS-7 cells\",\n      \"pmids\": [\"16574069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Deacetylase partner not identified\", \"Direct genomic targets unknown\", \"Repression shown only in artificial GAL4 context plus SRF reporter\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked the protein to cell death regulation by identifying a physical interaction with XIAP and a death-promoting phenotype, opening an apoptosis-related function.\",\n      \"evidence\": \"Overexpression death/sensitization assays in Saos2 and N2A cells with XIAP co-immunoprecipitation\",\n      \"pmids\": [\"18068114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"Binding domain not mapped\", \"Mechanism linking XIAP binding to death unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a distinct molecular role: that TCF25 enforces preferential K48 ubiquitin linkage on Listerin-ubiquitinated nascent chains in RQC.\",\n      \"evidence\": \"In vitro reconstitution of the mammalian RQC pathway with purified components and ubiquitin linkage analysis\",\n      \"pmids\": [\"30244831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of linkage specificity not yet structural\", \"Relationship to its nuclear functions unaddressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed the function is conserved and developmentally essential, placing the DUF654 domain in Wnt/Wingless signaling via genetic loss-of-function.\",\n      \"evidence\": \"CRISPR/Cas9 DUF654 knockout in Drosophila with overexpression rescue, TopFlash reporter, and Wg target gene qRT-PCR\",\n      \"pmids\": [\"29437009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular partner in Wnt pathway not identified\", \"Conservation of Wnt role in mammals untested\", \"Ortholog-based\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified a physiological transcriptional target and disease context by showing TCF25 binds NFAT3 and restrains cardiac hypertrophy in vivo.\",\n      \"evidence\": \"Reciprocal Co-IP with domain mapping, mouse knockout/transgenic rescue in an aortic banding model, and VIVIT peptide pharmacological epistasis\",\n      \"pmids\": [\"32805187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether repression occurs at the genome or by cytoplasmic NFAT sequestration not distinguished\", \"Connection to RQC role unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Positioned TCF25 downstream of NDST1 in cardiomyocyte stress responses, suggesting regulatory control of its expression.\",\n      \"evidence\": \"In vitro cardiomyocyte NDST1 overexpression/inhibition with NULP1 rescue and AKT phosphorylation readouts\",\n      \"pmids\": [\"36222339\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct molecular link between NDST1 and NULP1 established\", \"Cell-based only, single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Explained the discrepancy between TCF25 mRNA and protein abundance by demonstrating constitutive proteasomal degradation.\",\n      \"evidence\": \"Public dataset analysis with experimental proteasome inhibition in cell culture\",\n      \"pmids\": [\"38228636\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Responsible E3 ligase not identified in this study\", \"Degron not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved the structural mechanism of RQC linkage specificity and connected TCF25 turnover to its own pathway by showing it binds Listerin RING and acceptor ubiquitin and is itself a Listerin K48 substrate.\",\n      \"evidence\": \"In vitro ubiquitination and binding assays, AlphaFold3 modeling, and mutagenesis (replicated from preprint)\",\n      \"pmids\": [\"40169231\", \"39464025\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Experimental high-resolution structure absent\", \"Whether Listerin autoregulates TCF25 in cells not directly shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a lysosomal nutrient-sensing function in which TCF25 drives V-ATPase-dependent acidification, ferritinophagy, and lysosome-dependent cell death with in vivo pathological relevance.\",\n      \"evidence\": \"Genome-wide CRISPR screen, TCF25 and V-ATPase knockout, lysosomal/autophagy/ferritinophagy assays, and mouse hepatic ischemia-reperfusion model\",\n      \"pmids\": [\"40844875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular interaction with V-ATPase not demonstrated\", \"Whether this requires nuclear or RQC functions unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single protein integrates cytoplasmic RQC ubiquitin-chain editing, lysosomal acidification control, and nuclear transcriptional repression — and whether these reflect distinct pools or a shared mechanism — remains unresolved.\",\n      \"evidence\": \"No single study reconciles the RQC, lysosomal, and transcriptional activities\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No study addresses subcellular partitioning across the three roles\", \"No unifying biochemical activity proposed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 5, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"LTN1\", \"UBE2D1\", \"NFAT3\", \"XIAP\", \"SRF\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}