{"gene":"TSC22D4","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2013,"finding":"TSC22D4 acts as a transcription factor in liver whose elevated levels inhibit hepatic VLDL secretion and lipogenic gene expression; liver-specific ablation triggers hypertriglyceridemia through induction of hepatic VLDL secretion, establishing TSC22D4 as a regulator of hepatic lipid metabolism and VLDL release.","method":"Liver-specific overexpression and ablation (knockout) in mice with metabolic phenotyping (VLDL secretion assays, gene expression analysis)","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — liver-specific gain- and loss-of-function in vivo with multiple orthogonal metabolic readouts, replicated across dietary conditions","pmids":["23307490"],"is_preprint":false},{"year":2016,"finding":"Hepatic TSC22D4 directly transcriptionally regulates the secretory protein lipocalin 13 (LCN13) to control systemic glucose homeostasis; hepatic TSC22D4 inhibition prevents and reverses hyperglycaemia, glucose intolerance and insulin resistance in diabetes mouse models.","method":"Liver-specific knockdown/overexpression in diabetes mouse models, transcriptional regulation assays, correlation with LCN13 levels","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss- and gain-of-function in multiple diabetes mouse models with mechanistic link to direct transcriptional target LCN13, replicated across models","pmids":["27827363"],"is_preprint":false},{"year":2012,"finding":"TSC22D4 subcellular localization is developmentally regulated in cerebellar granule neurons (CGNs): it occupies both nuclear and cytoplasmic compartments in undifferentiated CGNs but specifically accumulates in somatodendritic and synaptic compartments upon maturation; siRNA-mediated silencing of TSC22D4 blocked CGN differentiation and inhibited neurite elongation in N1E-115 neuroblastoma cells.","method":"Immunofluorescence/fractionation in vivo and in vitro during CGN differentiation, siRNA knockdown with morphological readouts","journal":"Cerebellum (London, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments combined with siRNA loss-of-function phenotype, single lab","pmids":["20878296"],"is_preprint":false},{"year":2013,"finding":"TSC22D4 exists in multiple iso-/phospho-glycoforms with distinct subcellular localizations and interacting partners: the 42 kDa form is cytosolic and associates with TSC22D1.2 only in undifferentiated CGNs; the 55 kDa form associates with the nuclear matrix in differentiated CGNs; the 67 kDa form enters mitochondria of differentiated CGNs and associates with apoptosis-inducing factor (AIF); the 72 kDa form is O-GlcNAcylated and phosphorylated and is chromatin-associated regardless of differentiation state.","method":"Biochemical fractionation, co-immunoprecipitation, western blotting with isoform-specific analysis during CGN differentiation","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and fractionation with multiple isoforms characterized, single lab","pmids":["23305244"],"is_preprint":false},{"year":2019,"finding":"TSC22D4 (THG-1) knockout in esophageal tumor cells induces cellular senescence through activation of the JUNB pathway, which drives transcription of the CDK inhibitor P21 (CDKN1A); siRNA-mediated knockdown of JUNB reduced P21 mRNA and reversed senescence in THG-1 KO cells, placing TSC22D4 upstream of JUNB-P21 in the senescence pathway.","method":"CRISPR/Cas9 knockout, siRNA knockdown of JUNB, RT-PCR, senescence assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via CRISPR KO plus siRNA rescue experiment, single lab, two orthogonal methods","pmids":["31806366"],"is_preprint":false},{"year":2019,"finding":"TSC22D4 (THG-1) binds to NRBP1 and competitively prevents NRBP1 from binding and ubiquitinating SALL4, thereby stabilizing SALL4 protein and inducing stemness genes (NANOG, OCT4) to promote tumorsphere formation in esophageal squamous cell carcinoma cells.","method":"Co-immunoprecipitation (THG-1/NRBP1 interaction), ubiquitination assays, knockdown/overexpression with tumorsphere formation and gene expression readouts","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, ubiquitination assay for mechanism, functional rescue experiment, single lab","pmids":["31864704"],"is_preprint":false},{"year":2022,"finding":"TSC22D4 directly interacts with Akt1 via its intrinsically disordered D2 domain; energy deprivation and oxidative stress promote this interaction while refeeding or glucose/insulin exposure impairs it. The TSC22D4-Akt1 interaction reduces basal Akt phosphorylation and downstream signaling during starvation, and liver-specific reconstitution experiments confirmed this interaction improves glucose handling and insulin sensitivity.","method":"Co-immunoprecipitation, domain mapping (D2 domain), liver-specific genetic reconstitution in mice, phosphorylation assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mapping plus in vivo genetic reconstitution, multiple orthogonal methods in a single rigorous study","pmids":["36269831"],"is_preprint":false},{"year":2022,"finding":"TSC22D4 promotes TGFβ1-mediated activation of hepatic stellate cells (HSCs) and their proliferation and migration; RNA-seq revealed TSC22D4 initiates transcriptional programs associated with HSC activation, establishing a role for TSC22D4 in liver fibrosis across hepatocytes and HSCs.","method":"TSC22D4 loss-of-function in HSCs, proliferation/migration assays, RNA-sequencing","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function with defined cellular phenotypes and transcriptomic support, single lab, single method per readout","pmids":["35714570"],"is_preprint":false},{"year":2022,"finding":"Hepatocyte-specific deletion of TSC22D4 upregulates mitochondrial-related processes including the TCA cycle, mitochondrial organization, and triglyceride metabolism, reducing liver lipid accumulation, steatosis, and apoptosis; single-nuclei RNA sequencing identified a distinct TSC22D4-dependent mitochondrial gene signature in hepatocytes.","method":"Hepatocyte-specific knockout (TSC22D4-HepaKO), NASH diet models, single-nuclei RNA sequencing, metabolic phenotyping","journal":"Molecular metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific in vivo knockout with snRNA-seq mechanistic readout, single lab, two orthogonal methods","pmids":["35378329"],"is_preprint":false},{"year":2023,"finding":"TSC22D4 (THG-1) is phosphorylated by the RTK-RAS-ERK pathway in squamous cell carcinoma cells, promoting oncogene-mediated tumorigenesis; TSC22D4 also regulates alternative splicing of CD44 variants (a regulator of invasiveness, stemness, and oxidative stress resistance) downstream of RTK signaling.","method":"Phosphorylation assays, specific phospho-antibody, knockdown/overexpression in SCC cells with proliferation, invasion, and xenograft assays","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation identified by specific antibody with in vivo xenograft validation, single lab","pmids":["37607779"],"is_preprint":false},{"year":2025,"finding":"TSC22D4 (THG-1) binds to NRBP1, suppressing NRBP1's E3 ubiquitin ligase-mediated degradation of TRAF6, thereby stabilizing TRAF6 and promoting NF-κB nuclear translocation and activation of IL-1 and TNF pathway transcriptional targets (IL1A, IL1B, TNFA, IL8) in squamous cell carcinoma cells.","method":"Co-immunoprecipitation (THG-1/NRBP1 interaction), RNA sequencing, siRNA knockdown, NF-κB nuclear translocation assays, TRAF6 ubiquitination/degradation assays","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, knockdown with pathway readouts, mechanistic ubiquitination assay, single lab","pmids":["39869046"],"is_preprint":false},{"year":2026,"finding":"TSC22D4 directly binds KEAP1 via a conserved ETGE motif, disrupting the KEAP1-NRF2 complex and preventing NRF2 ubiquitination and degradation, thereby stabilizing NRF2, activating ARE-driven transcription, and upregulating SLC7A11 to suppress ferroptosis and confer sorafenib resistance in clear cell renal cell carcinoma.","method":"Co-immunoprecipitation (TSC22D4/KEAP1 interaction), NRF2 ubiquitination assays, NRF2 stability assays, SLC7A11 expression and ferroptosis/drug resistance assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mechanistic ubiquitination and stability assays, single lab, multiple orthogonal readouts","pmids":["42248840"],"is_preprint":false},{"year":2024,"finding":"TSC22D4 contains two RΦ-motifs that interact with the CCTL1 domain of WNK1 and the CCT domain of NRBP1, forming a multi-subunit complex with WNK1, SPAK, and NRBP1 in response to osmotic stress; this complex is required for WNK1 pathway activation.","method":"Proximity ligation, immunoprecipitation, mass spectrometry, AlphaFold-3 structural modelling, immunoblotting","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, interaction confirmed by IP/MS but TSC22D4-specific functional experiments limited; complex modelling is computational","pmids":[],"is_preprint":true},{"year":2025,"finding":"TSC22D4 directly binds glucose at its C-terminal leucine zipper region; mutation of isoleucine 322 to tryptophan (I322W) abolishes glucose binding. Glucose binding increases accessibility of the leucine zipper region and promotes intra-protein contacts between the C-terminal zipper and N-terminal intrinsically disordered domain; high glucose conditions promote TSC22D4 association with fatty acid metabolism machinery proteins.","method":"Thermal proteome profiling (PISA), microscale thermophoresis (MST) confirming direct glucose-protein interaction, UV-crosslinking mass spectrometry identifying binding site, site-directed mutagenesis (I322W), chemo-proteomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct binding confirmed by MST, site identified by crosslinking-MS, mutagenesis validation; preprint, single lab","pmids":[],"is_preprint":true}],"current_model":"TSC22D4 is a leucine zipper transcription factor that functions as an environmental/metabolic sensor in the liver, where it suppresses VLDL secretion and lipogenic gene expression, directly transcribes LCN13 to regulate insulin sensitivity, interacts with Akt1 (via its D2 domain) to dampen insulin signaling during starvation, binds glucose directly at its C-terminal leucine zipper (I322W abolishes binding), and in non-hepatic contexts binds NRBP1 to stabilize TRAF6 (activating NF-κB/IL-1 signaling), stabilizes SALL4 by blocking NRBP1-mediated ubiquitination (promoting stemness), and disrupts the KEAP1-NRF2 complex via an ETGE motif to activate antioxidant responses; it is regulated post-translationally by RTK-RAS-ERK phosphorylation and O-GlcNAcylation, and its multiple isoforms display distinct subcellular localizations with isoform-specific binding partners including TSC22D1.2 and apoptosis-inducing factor."},"narrative":{"mechanistic_narrative":"TSC22D4 is a leucine-zipper transcriptional regulator that acts as a hepatic metabolic sensor coordinating lipid handling, glucose homeostasis, and insulin signaling [PMID:23307490, PMID:27827363, PMID:36269831]. In liver, elevated TSC22D4 suppresses VLDL secretion and lipogenic gene expression, and its loss drives hypertriglyceridemia, while hepatocyte-specific deletion derepresses mitochondrial programs (TCA cycle, triglyceride metabolism) and reduces steatosis and apoptosis [PMID:23307490, PMID:35378329]. It controls systemic glucose homeostasis by directly transcribing the secretory factor LCN13, and its hepatic inhibition prevents and reverses hyperglycemia, glucose intolerance, and insulin resistance in diabetes models [PMID:27827363]. Mechanistically, under energy deprivation and oxidative stress TSC22D4 engages Akt1 through its intrinsically disordered D2 domain to dampen Akt phosphorylation and downstream insulin signaling, an interaction relieved by refeeding or glucose/insulin [PMID:36269831]; consistent with nutrient sensing, TSC22D4 directly binds glucose at its C-terminal leucine zipper, a contact abolished by the I322W mutation that reshapes intramolecular zipper–disordered-domain contacts and reroutes its protein associations toward fatty-acid metabolism machinery. Beyond the liver, TSC22D4 operates through a recurrent NRBP1-centered axis: by binding NRBP1 it competitively blocks NRBP1-mediated ubiquitination of SALL4 to stabilize it and induce stemness genes, and suppresses NRBP1-driven degradation of TRAF6 to stabilize TRAF6 and activate NF-κB/IL-1/TNF transcriptional outputs [PMID:31864704, PMID:39869046]. It additionally stabilizes NRF2 by disrupting the KEAP1–NRF2 complex through a conserved ETGE motif, activating ARE-driven antioxidant transcription and SLC7A11 to suppress ferroptosis [PMID:42248840], and is itself activated by RTK-RAS-ERK phosphorylation in carcinoma cells where it influences JUNB-P21 senescence control and CD44 splicing [PMID:31806366, PMID:37607779]. TSC22D4 exists as multiple iso-/phospho-glycoforms with distinct subcellular localizations and partners, including a chromatin-associated O-GlcNAcylated form and a mitochondrial form associating with apoptosis-inducing factor [PMID:23305244].","teleology":[{"year":2012,"claim":"Established that TSC22D4 has a regulated subcellular distribution and is functionally required for a cellular differentiation program, the first evidence of an active cellular role.","evidence":"Immunofluorescence/fractionation across cerebellar granule neuron differentiation plus siRNA knockdown with morphological readouts","pmids":["20878296"],"confidence":"Medium","gaps":["No molecular partners or transcriptional targets identified","Mechanism linking localization to differentiation unknown"]},{"year":2013,"claim":"Defined TSC22D4 as a hepatic transcription factor controlling lipid metabolism, answering what physiological process it governs.","evidence":"Liver-specific overexpression and knockout in mice with VLDL secretion and lipogenic gene-expression readouts","pmids":["23307490"],"confidence":"High","gaps":["Direct transcriptional targets in lipid control not defined","Upstream regulators of hepatic TSC22D4 levels unclear"]},{"year":2013,"claim":"Showed that TSC22D4 function is partitioned across multiple iso-/phospho-glycoforms with distinct localizations and partners, explaining how one gene reaches nucleus, cytosol, chromatin, and mitochondria.","evidence":"Biochemical fractionation, isoform-resolved co-immunoprecipitation and western blotting during neuronal differentiation","pmids":["23305244"],"confidence":"Medium","gaps":["Functional consequence of each isoform not tested","AIF and TSC22D1.2 interactions not validated reciprocally or functionally"]},{"year":2016,"claim":"Identified LCN13 as a direct transcriptional target linking hepatic TSC22D4 to systemic glucose homeostasis, providing the first mechanistic effector of its metabolic role.","evidence":"Liver-specific knockdown/overexpression in diabetes mouse models with transcriptional and glucose-handling readouts","pmids":["27827363"],"confidence":"High","gaps":["DNA-binding specificity and direct promoter occupancy not structurally defined","Whether LCN13 fully accounts for the glucose phenotype unresolved"]},{"year":2019,"claim":"Placed TSC22D4 in cancer signaling, both upstream of JUNB-P21 senescence control and as an NRBP1-binding stabilizer of SALL4, revealing a non-transcriptional protein-stabilization mechanism.","evidence":"CRISPR knockout with siRNA epistasis (JUNB), Co-IP, and ubiquitination/tumorsphere assays in squamous carcinoma cells","pmids":["31806366","31864704"],"confidence":"Medium","gaps":["NRBP1-binding interface on TSC22D4 not mapped","Connection between metabolic and oncogenic functions unclear"]},{"year":2022,"claim":"Demonstrated direct, nutrient-state-dependent TSC22D4-Akt1 binding through the D2 domain, establishing the molecular basis for its modulation of insulin signaling during starvation.","evidence":"Reciprocal Co-IP, domain mapping, and liver-specific genetic reconstitution in mice with phosphorylation readouts","pmids":["36269831"],"confidence":"High","gaps":["Structural detail of the disordered D2–Akt1 contact not resolved","How the same protein switches between transcriptional and Akt-binding modes unknown"]},{"year":2022,"claim":"Extended TSC22D4's hepatic role to fibrosis and mitochondrial control, showing it activates HSC transcriptional programs and restrains hepatocyte mitochondrial metabolism.","evidence":"Loss-of-function in hepatic stellate cells and hepatocyte-specific knockout with RNA-seq and single-nuclei RNA-seq in NASH models","pmids":["35714570","35378329"],"confidence":"Medium","gaps":["Direct transcriptional targets driving fibrosis and mitochondrial signatures not pinpointed","Whether effects are cell-autonomous or paracrine not fully resolved"]},{"year":2023,"claim":"Identified RTK-RAS-ERK phosphorylation as an upstream activating input and CD44 alternative splicing as a downstream output, integrating TSC22D4 into oncogenic kinase signaling.","evidence":"Phospho-specific antibody detection, knockdown/overexpression, and xenograft assays in SCC cells","pmids":["37607779"],"confidence":"Medium","gaps":["Phosphosite identity and its effect on each TSC22D4 activity not defined","Mechanism of splicing regulation unknown"]},{"year":2025,"claim":"Generalized the NRBP1 axis by showing TSC22D4 stabilizes TRAF6 to drive NF-κB/IL-1/TNF transcription, unifying its protein-stabilization role across distinct substrates.","evidence":"Co-IP, RNA-seq, siRNA knockdown, NF-κB translocation and TRAF6 ubiquitination assays in SCC cells","pmids":["39869046"],"confidence":"Medium","gaps":["Determinants of substrate selectivity (SALL4 vs TRAF6) within the NRBP1 complex unknown","Physiological context where this pathway dominates not defined"]},{"year":2026,"claim":"Revealed an ETGE-motif-dependent disruption of KEAP1-NRF2 by TSC22D4, defining a direct mechanism for antioxidant activation, ferroptosis suppression, and drug resistance.","evidence":"Co-IP, NRF2 ubiquitination/stability assays, SLC7A11 and ferroptosis/sorafenib-resistance readouts in renal carcinoma cells","pmids":["42248840"],"confidence":"Medium","gaps":["Structural basis of ETGE-KEAP1 engagement not solved","Whether this NRF2 axis operates in liver/metabolic contexts untested"]},{"year":2025,"claim":"Provided direct biophysical evidence that TSC22D4 is a glucose-binding protein, mapping the binding site to the C-terminal leucine zipper and offering a molecular basis for nutrient sensing.","evidence":"Thermal proteome profiling, microscale thermophoresis, UV-crosslinking MS, and I322W mutagenesis (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint; not yet peer-reviewed or independently confirmed","Functional consequence of glucose binding for transcription/Akt/NRBP1 activities not established in vivo"]},{"year":2024,"claim":"Positioned TSC22D4 within an osmotic-stress WNK1-SPAK-NRBP1 complex via RΦ motifs, extending its scaffolding role to ion-stress signaling.","evidence":"Proximity ligation, IP-MS, and AlphaFold-3 modelling (preprint)","pmids":[],"confidence":"Low","gaps":["Preprint; complex architecture is partly computational and TSC22D4-specific functional tests are limited","Direct binding contributions not separated from co-complex membership"]},{"year":null,"claim":"How TSC22D4 switches among its transcriptional, kinase-binding, scaffold, and glucose-sensing modes, and how isoform identity and post-translational modification select among them, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of full-length TSC22D4 or its functional complexes","Mechanism coupling glucose binding to a specific downstream activity unknown","Whether the NRBP1, KEAP1, and metabolic functions co-occur in the same cell type untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,10,11,6]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[3]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,10]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[11,6]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,10,11]}],"complexes":["WNK1-SPAK-NRBP1 complex"],"partners":["AKT1","NRBP1","KEAP1","WNK1","TSC22D1","AIFM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y3Q8","full_name":"TSC22 domain family protein 4","aliases":["TSC22-related-inducible leucine zipper protein 2"],"length_aa":395,"mass_kda":41.0,"function":"Binds DNA and acts as a transcriptional repressor (PubMed:10488076). Involved in the regulation of systematic glucose homeostasis and insulin sensitivity, via transcriptional repression of downstream insulin signaling targets such as OBP2A/LCN13 (By similarity). Acts as a negative regulator of lipogenic gene expression in hepatocytes and thereby mediates the control of very low-density lipoprotein release (PubMed:23307490). May play a role in neurite elongation and survival (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Cell projection, dendrite; Synapse","url":"https://www.uniprot.org/uniprotkb/Q9Y3Q8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TSC22D4","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"NRBP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TSC22D4","total_profiled":1310},"omim":[{"mim_id":"611914","title":"TSC22 DOMAIN FAMILY, MEMBER 4; TSC22D4","url":"https://www.omim.org/entry/611914"},{"mim_id":"607715","title":"TSC22 DOMAIN FAMILY, MEMBER 1; TSC22D1","url":"https://www.omim.org/entry/607715"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":851.2}],"url":"https://www.proteinatlas.org/search/TSC22D4"},"hgnc":{"alias_symbol":["THG-1","TILZ2"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y3Q8","domains":[{"cath_id":"1.20.5","chopping":"329-355","consensus_level":"medium","plddt":97.2926,"start":329,"end":355}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y3Q8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y3Q8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y3Q8-F1-predicted_aligned_error_v6.png","plddt_mean":56.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TSC22D4","jax_strain_url":"https://www.jax.org/strain/search?query=TSC22D4"},"sequence":{"accession":"Q9Y3Q8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y3Q8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y3Q8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y3Q8"}},"corpus_meta":[{"pmid":"23307490","id":"PMC_23307490","title":"TSC22D4 is a molecular output of hepatic wasting metabolism.","date":"2013","source":"EMBO molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/23307490","citation_count":53,"is_preprint":false},{"pmid":"27827363","id":"PMC_27827363","title":"Control of diabetic hyperglycaemia and insulin resistance through TSC22D4.","date":"2016","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/27827363","citation_count":30,"is_preprint":false},{"pmid":"20878296","id":"PMC_20878296","title":"Subcellular TSC22D4 localization in cerebellum granule neurons of the mouse depends on development and differentiation.","date":"2012","source":"Cerebellum (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/20878296","citation_count":23,"is_preprint":false},{"pmid":"36269831","id":"PMC_36269831","title":"TSC22D4 interacts with Akt1 to regulate glucose metabolism.","date":"2022","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/36269831","citation_count":18,"is_preprint":false},{"pmid":"31806366","id":"PMC_31806366","title":"Promotion of cellular senescence by THG-1/TSC22D4 knockout through activation of JUNB.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/31806366","citation_count":13,"is_preprint":false},{"pmid":"31864704","id":"PMC_31864704","title":"THG-1 suppresses SALL4 degradation to induce stemness genes and tumorsphere formation through antagonizing NRBP1 in squamous cell carcinoma cells.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/31864704","citation_count":11,"is_preprint":false},{"pmid":"23305244","id":"PMC_23305244","title":"Multiple TSC22D4 iso-/phospho-glycoforms display idiosyncratic subcellular localizations and interacting protein partners.","date":"2013","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/23305244","citation_count":10,"is_preprint":false},{"pmid":"35714570","id":"PMC_35714570","title":"TSC22D4 promotes TGFβ1-induced activation of hepatic stellate cells.","date":"2022","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/35714570","citation_count":7,"is_preprint":false},{"pmid":"35378329","id":"PMC_35378329","title":"Hepatocyte-specific activity of TSC22D4 triggers progressive NAFLD by impairing mitochondrial function.","date":"2022","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/35378329","citation_count":7,"is_preprint":false},{"pmid":"37607779","id":"PMC_37607779","title":"Promotion of squamous cell carcinoma tumorigenesis by oncogene-mediated THG-1/TSC22D4 phosphorylation.","date":"2023","source":"Cancer 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39906612","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.06.651509","title":"Thermal proteome profiling identifies glucose binding proteins involved in metabolic disease","date":"2025-05-07","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.06.651509","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.12.12.628181","title":"NRBP1 pseudokinase binds to and activates the WNK pathway in response to osmotic stress","date":"2024-12-17","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.12.628181","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9644,"output_tokens":3756,"usd":0.042636,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11489,"output_tokens":4448,"usd":0.084322,"stage2_stop_reason":"end_turn"},"total_usd":0.126958,"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\": 2013,\n      \"finding\": \"TSC22D4 acts as a transcription factor in liver whose elevated levels inhibit hepatic VLDL secretion and lipogenic gene expression; liver-specific ablation triggers hypertriglyceridemia through induction of hepatic VLDL secretion, establishing TSC22D4 as a regulator of hepatic lipid metabolism and VLDL release.\",\n      \"method\": \"Liver-specific overexpression and ablation (knockout) in mice with metabolic phenotyping (VLDL secretion assays, gene expression analysis)\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — liver-specific gain- and loss-of-function in vivo with multiple orthogonal metabolic readouts, replicated across dietary conditions\",\n      \"pmids\": [\"23307490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hepatic TSC22D4 directly transcriptionally regulates the secretory protein lipocalin 13 (LCN13) to control systemic glucose homeostasis; hepatic TSC22D4 inhibition prevents and reverses hyperglycaemia, glucose intolerance and insulin resistance in diabetes mouse models.\",\n      \"method\": \"Liver-specific knockdown/overexpression in diabetes mouse models, transcriptional regulation assays, correlation with LCN13 levels\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss- and gain-of-function in multiple diabetes mouse models with mechanistic link to direct transcriptional target LCN13, replicated across models\",\n      \"pmids\": [\"27827363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TSC22D4 subcellular localization is developmentally regulated in cerebellar granule neurons (CGNs): it occupies both nuclear and cytoplasmic compartments in undifferentiated CGNs but specifically accumulates in somatodendritic and synaptic compartments upon maturation; siRNA-mediated silencing of TSC22D4 blocked CGN differentiation and inhibited neurite elongation in N1E-115 neuroblastoma cells.\",\n      \"method\": \"Immunofluorescence/fractionation in vivo and in vitro during CGN differentiation, siRNA knockdown with morphological readouts\",\n      \"journal\": \"Cerebellum (London, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments combined with siRNA loss-of-function phenotype, single lab\",\n      \"pmids\": [\"20878296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TSC22D4 exists in multiple iso-/phospho-glycoforms with distinct subcellular localizations and interacting partners: the 42 kDa form is cytosolic and associates with TSC22D1.2 only in undifferentiated CGNs; the 55 kDa form associates with the nuclear matrix in differentiated CGNs; the 67 kDa form enters mitochondria of differentiated CGNs and associates with apoptosis-inducing factor (AIF); the 72 kDa form is O-GlcNAcylated and phosphorylated and is chromatin-associated regardless of differentiation state.\",\n      \"method\": \"Biochemical fractionation, co-immunoprecipitation, western blotting with isoform-specific analysis during CGN differentiation\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and fractionation with multiple isoforms characterized, single lab\",\n      \"pmids\": [\"23305244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TSC22D4 (THG-1) knockout in esophageal tumor cells induces cellular senescence through activation of the JUNB pathway, which drives transcription of the CDK inhibitor P21 (CDKN1A); siRNA-mediated knockdown of JUNB reduced P21 mRNA and reversed senescence in THG-1 KO cells, placing TSC22D4 upstream of JUNB-P21 in the senescence pathway.\",\n      \"method\": \"CRISPR/Cas9 knockout, siRNA knockdown of JUNB, RT-PCR, senescence assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via CRISPR KO plus siRNA rescue experiment, single lab, two orthogonal methods\",\n      \"pmids\": [\"31806366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TSC22D4 (THG-1) binds to NRBP1 and competitively prevents NRBP1 from binding and ubiquitinating SALL4, thereby stabilizing SALL4 protein and inducing stemness genes (NANOG, OCT4) to promote tumorsphere formation in esophageal squamous cell carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation (THG-1/NRBP1 interaction), ubiquitination assays, knockdown/overexpression with tumorsphere formation and gene expression readouts\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, ubiquitination assay for mechanism, functional rescue experiment, single lab\",\n      \"pmids\": [\"31864704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TSC22D4 directly interacts with Akt1 via its intrinsically disordered D2 domain; energy deprivation and oxidative stress promote this interaction while refeeding or glucose/insulin exposure impairs it. The TSC22D4-Akt1 interaction reduces basal Akt phosphorylation and downstream signaling during starvation, and liver-specific reconstitution experiments confirmed this interaction improves glucose handling and insulin sensitivity.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping (D2 domain), liver-specific genetic reconstitution in mice, phosphorylation assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mapping plus in vivo genetic reconstitution, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"36269831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TSC22D4 promotes TGFβ1-mediated activation of hepatic stellate cells (HSCs) and their proliferation and migration; RNA-seq revealed TSC22D4 initiates transcriptional programs associated with HSC activation, establishing a role for TSC22D4 in liver fibrosis across hepatocytes and HSCs.\",\n      \"method\": \"TSC22D4 loss-of-function in HSCs, proliferation/migration assays, RNA-sequencing\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function with defined cellular phenotypes and transcriptomic support, single lab, single method per readout\",\n      \"pmids\": [\"35714570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hepatocyte-specific deletion of TSC22D4 upregulates mitochondrial-related processes including the TCA cycle, mitochondrial organization, and triglyceride metabolism, reducing liver lipid accumulation, steatosis, and apoptosis; single-nuclei RNA sequencing identified a distinct TSC22D4-dependent mitochondrial gene signature in hepatocytes.\",\n      \"method\": \"Hepatocyte-specific knockout (TSC22D4-HepaKO), NASH diet models, single-nuclei RNA sequencing, metabolic phenotyping\",\n      \"journal\": \"Molecular metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific in vivo knockout with snRNA-seq mechanistic readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"35378329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TSC22D4 (THG-1) is phosphorylated by the RTK-RAS-ERK pathway in squamous cell carcinoma cells, promoting oncogene-mediated tumorigenesis; TSC22D4 also regulates alternative splicing of CD44 variants (a regulator of invasiveness, stemness, and oxidative stress resistance) downstream of RTK signaling.\",\n      \"method\": \"Phosphorylation assays, specific phospho-antibody, knockdown/overexpression in SCC cells with proliferation, invasion, and xenograft assays\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation identified by specific antibody with in vivo xenograft validation, single lab\",\n      \"pmids\": [\"37607779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TSC22D4 (THG-1) binds to NRBP1, suppressing NRBP1's E3 ubiquitin ligase-mediated degradation of TRAF6, thereby stabilizing TRAF6 and promoting NF-κB nuclear translocation and activation of IL-1 and TNF pathway transcriptional targets (IL1A, IL1B, TNFA, IL8) in squamous cell carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation (THG-1/NRBP1 interaction), RNA sequencing, siRNA knockdown, NF-κB nuclear translocation assays, TRAF6 ubiquitination/degradation assays\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, knockdown with pathway readouts, mechanistic ubiquitination assay, single lab\",\n      \"pmids\": [\"39869046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TSC22D4 directly binds KEAP1 via a conserved ETGE motif, disrupting the KEAP1-NRF2 complex and preventing NRF2 ubiquitination and degradation, thereby stabilizing NRF2, activating ARE-driven transcription, and upregulating SLC7A11 to suppress ferroptosis and confer sorafenib resistance in clear cell renal cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation (TSC22D4/KEAP1 interaction), NRF2 ubiquitination assays, NRF2 stability assays, SLC7A11 expression and ferroptosis/drug resistance assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mechanistic ubiquitination and stability assays, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"42248840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TSC22D4 contains two RΦ-motifs that interact with the CCTL1 domain of WNK1 and the CCT domain of NRBP1, forming a multi-subunit complex with WNK1, SPAK, and NRBP1 in response to osmotic stress; this complex is required for WNK1 pathway activation.\",\n      \"method\": \"Proximity ligation, immunoprecipitation, mass spectrometry, AlphaFold-3 structural modelling, immunoblotting\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, interaction confirmed by IP/MS but TSC22D4-specific functional experiments limited; complex modelling is computational\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TSC22D4 directly binds glucose at its C-terminal leucine zipper region; mutation of isoleucine 322 to tryptophan (I322W) abolishes glucose binding. Glucose binding increases accessibility of the leucine zipper region and promotes intra-protein contacts between the C-terminal zipper and N-terminal intrinsically disordered domain; high glucose conditions promote TSC22D4 association with fatty acid metabolism machinery proteins.\",\n      \"method\": \"Thermal proteome profiling (PISA), microscale thermophoresis (MST) confirming direct glucose-protein interaction, UV-crosslinking mass spectrometry identifying binding site, site-directed mutagenesis (I322W), chemo-proteomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct binding confirmed by MST, site identified by crosslinking-MS, mutagenesis validation; preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"TSC22D4 is a leucine zipper transcription factor that functions as an environmental/metabolic sensor in the liver, where it suppresses VLDL secretion and lipogenic gene expression, directly transcribes LCN13 to regulate insulin sensitivity, interacts with Akt1 (via its D2 domain) to dampen insulin signaling during starvation, binds glucose directly at its C-terminal leucine zipper (I322W abolishes binding), and in non-hepatic contexts binds NRBP1 to stabilize TRAF6 (activating NF-κB/IL-1 signaling), stabilizes SALL4 by blocking NRBP1-mediated ubiquitination (promoting stemness), and disrupts the KEAP1-NRF2 complex via an ETGE motif to activate antioxidant responses; it is regulated post-translationally by RTK-RAS-ERK phosphorylation and O-GlcNAcylation, and its multiple isoforms display distinct subcellular localizations with isoform-specific binding partners including TSC22D1.2 and apoptosis-inducing factor.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TSC22D4 is a leucine-zipper transcriptional regulator that acts as a hepatic metabolic sensor coordinating lipid handling, glucose homeostasis, and insulin signaling [#0, #1, #6]. In liver, elevated TSC22D4 suppresses VLDL secretion and lipogenic gene expression, and its loss drives hypertriglyceridemia, while hepatocyte-specific deletion derepresses mitochondrial programs (TCA cycle, triglyceride metabolism) and reduces steatosis and apoptosis [#0, #8]. It controls systemic glucose homeostasis by directly transcribing the secretory factor LCN13, and its hepatic inhibition prevents and reverses hyperglycemia, glucose intolerance, and insulin resistance in diabetes models [#1]. Mechanistically, under energy deprivation and oxidative stress TSC22D4 engages Akt1 through its intrinsically disordered D2 domain to dampen Akt phosphorylation and downstream insulin signaling, an interaction relieved by refeeding or glucose/insulin [#6]; consistent with nutrient sensing, TSC22D4 directly binds glucose at its C-terminal leucine zipper, a contact abolished by the I322W mutation that reshapes intramolecular zipper–disordered-domain contacts and reroutes its protein associations toward fatty-acid metabolism machinery [#13]. Beyond the liver, TSC22D4 operates through a recurrent NRBP1-centered axis: by binding NRBP1 it competitively blocks NRBP1-mediated ubiquitination of SALL4 to stabilize it and induce stemness genes, and suppresses NRBP1-driven degradation of TRAF6 to stabilize TRAF6 and activate NF-\\u03baB/IL-1/TNF transcriptional outputs [#5, #10]. It additionally stabilizes NRF2 by disrupting the KEAP1–NRF2 complex through a conserved ETGE motif, activating ARE-driven antioxidant transcription and SLC7A11 to suppress ferroptosis [#11], and is itself activated by RTK-RAS-ERK phosphorylation in carcinoma cells where it influences JUNB-P21 senescence control and CD44 splicing [#4, #9]. TSC22D4 exists as multiple iso-/phospho-glycoforms with distinct subcellular localizations and partners, including a chromatin-associated O-GlcNAcylated form and a mitochondrial form associating with apoptosis-inducing factor [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established that TSC22D4 has a regulated subcellular distribution and is functionally required for a cellular differentiation program, the first evidence of an active cellular role.\",\n      \"evidence\": \"Immunofluorescence/fractionation across cerebellar granule neuron differentiation plus siRNA knockdown with morphological readouts\",\n      \"pmids\": [\"20878296\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular partners or transcriptional targets identified\", \"Mechanism linking localization to differentiation unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined TSC22D4 as a hepatic transcription factor controlling lipid metabolism, answering what physiological process it governs.\",\n      \"evidence\": \"Liver-specific overexpression and knockout in mice with VLDL secretion and lipogenic gene-expression readouts\",\n      \"pmids\": [\"23307490\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in lipid control not defined\", \"Upstream regulators of hepatic TSC22D4 levels unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed that TSC22D4 function is partitioned across multiple iso-/phospho-glycoforms with distinct localizations and partners, explaining how one gene reaches nucleus, cytosol, chromatin, and mitochondria.\",\n      \"evidence\": \"Biochemical fractionation, isoform-resolved co-immunoprecipitation and western blotting during neuronal differentiation\",\n      \"pmids\": [\"23305244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of each isoform not tested\", \"AIF and TSC22D1.2 interactions not validated reciprocally or functionally\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified LCN13 as a direct transcriptional target linking hepatic TSC22D4 to systemic glucose homeostasis, providing the first mechanistic effector of its metabolic role.\",\n      \"evidence\": \"Liver-specific knockdown/overexpression in diabetes mouse models with transcriptional and glucose-handling readouts\",\n      \"pmids\": [\"27827363\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DNA-binding specificity and direct promoter occupancy not structurally defined\", \"Whether LCN13 fully accounts for the glucose phenotype unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed TSC22D4 in cancer signaling, both upstream of JUNB-P21 senescence control and as an NRBP1-binding stabilizer of SALL4, revealing a non-transcriptional protein-stabilization mechanism.\",\n      \"evidence\": \"CRISPR knockout with siRNA epistasis (JUNB), Co-IP, and ubiquitination/tumorsphere assays in squamous carcinoma cells\",\n      \"pmids\": [\"31806366\", \"31864704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NRBP1-binding interface on TSC22D4 not mapped\", \"Connection between metabolic and oncogenic functions unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated direct, nutrient-state-dependent TSC22D4-Akt1 binding through the D2 domain, establishing the molecular basis for its modulation of insulin signaling during starvation.\",\n      \"evidence\": \"Reciprocal Co-IP, domain mapping, and liver-specific genetic reconstitution in mice with phosphorylation readouts\",\n      \"pmids\": [\"36269831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of the disordered D2–Akt1 contact not resolved\", \"How the same protein switches between transcriptional and Akt-binding modes unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended TSC22D4's hepatic role to fibrosis and mitochondrial control, showing it activates HSC transcriptional programs and restrains hepatocyte mitochondrial metabolism.\",\n      \"evidence\": \"Loss-of-function in hepatic stellate cells and hepatocyte-specific knockout with RNA-seq and single-nuclei RNA-seq in NASH models\",\n      \"pmids\": [\"35714570\", \"35378329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets driving fibrosis and mitochondrial signatures not pinpointed\", \"Whether effects are cell-autonomous or paracrine not fully resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified RTK-RAS-ERK phosphorylation as an upstream activating input and CD44 alternative splicing as a downstream output, integrating TSC22D4 into oncogenic kinase signaling.\",\n      \"evidence\": \"Phospho-specific antibody detection, knockdown/overexpression, and xenograft assays in SCC cells\",\n      \"pmids\": [\"37607779\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphosite identity and its effect on each TSC22D4 activity not defined\", \"Mechanism of splicing regulation unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Generalized the NRBP1 axis by showing TSC22D4 stabilizes TRAF6 to drive NF-\\u03baB/IL-1/TNF transcription, unifying its protein-stabilization role across distinct substrates.\",\n      \"evidence\": \"Co-IP, RNA-seq, siRNA knockdown, NF-\\u03baB translocation and TRAF6 ubiquitination assays in SCC cells\",\n      \"pmids\": [\"39869046\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Determinants of substrate selectivity (SALL4 vs TRAF6) within the NRBP1 complex unknown\", \"Physiological context where this pathway dominates not defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed an ETGE-motif-dependent disruption of KEAP1-NRF2 by TSC22D4, defining a direct mechanism for antioxidant activation, ferroptosis suppression, and drug resistance.\",\n      \"evidence\": \"Co-IP, NRF2 ubiquitination/stability assays, SLC7A11 and ferroptosis/sorafenib-resistance readouts in renal carcinoma cells\",\n      \"pmids\": [\"42248840\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of ETGE-KEAP1 engagement not solved\", \"Whether this NRF2 axis operates in liver/metabolic contexts untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided direct biophysical evidence that TSC22D4 is a glucose-binding protein, mapping the binding site to the C-terminal leucine zipper and offering a molecular basis for nutrient sensing.\",\n      \"evidence\": \"Thermal proteome profiling, microscale thermophoresis, UV-crosslinking MS, and I322W mutagenesis (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint; not yet peer-reviewed or independently confirmed\", \"Functional consequence of glucose binding for transcription/Akt/NRBP1 activities not established in vivo\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Positioned TSC22D4 within an osmotic-stress WNK1-SPAK-NRBP1 complex via R\\u03a6 motifs, extending its scaffolding role to ion-stress signaling.\",\n      \"evidence\": \"Proximity ligation, IP-MS, and AlphaFold-3 modelling (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint; complex architecture is partly computational and TSC22D4-specific functional tests are limited\", \"Direct binding contributions not separated from co-complex membership\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TSC22D4 switches among its transcriptional, kinase-binding, scaffold, and glucose-sensing modes, and how isoform identity and post-translational modification select among them, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of full-length TSC22D4 or its functional complexes\", \"Mechanism coupling glucose binding to a specific downstream activity unknown\", \"Whether the NRBP1, KEAP1, and metabolic functions co-occur in the same cell type untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 10, 11, 6]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 10]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [11, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 10, 11]}\n    ],\n    \"complexes\": [\n      \"WNK1-SPAK-NRBP1 complex\"\n    ],\n    \"partners\": [\n      \"AKT1\",\n      \"NRBP1\",\n      \"KEAP1\",\n      \"WNK1\",\n      \"TSC22D1\",\n      \"AIFM1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}