{"gene":"TSC22D2","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2006,"finding":"All four TSC22D2 splice variants are transiently upregulated by hyperosmolality (hypertonicity signal, not cell-permeable osmolytes) in mouse kidney cells (mIMCD3), and the mechanism of upregulation is mRNA stabilization. Overexpression of TSC22D2-4 conferred protection against osmotic stress, resulting in a 2.7-fold increase in cell survival at 600 mOsmol/kg.","method":"mRNA stability assay, overexpression with cell survival readout, hyperosmolality vs. permeable osmolyte treatment in mIMCD3 cells","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (mRNA stability and functional overexpression survival assay), single lab","pmids":["17147695"],"is_preprint":false},{"year":2016,"finding":"TSC22D2 physically interacts with pyruvate kinase isoform M2 (PKM2); overexpression of TSC22D2 reduces nuclear PKM2 levels and suppresses cyclin D1 expression, inhibiting colorectal cancer cell growth via a TSC22D2-PKM2-cyclin D1 regulatory axis.","method":"Co-immunoprecipitation combined with mass spectrometry, immunoprecipitation, immunofluorescence, overexpression growth assay","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with MS confirmation plus functional downstream readout (cyclin D1, cell growth), single lab","pmids":["27573352"],"is_preprint":false},{"year":2016,"finding":"TSC22D2 physically interacts with WDR77 (WD repeat domain 77 protein), as identified by yeast two-hybrid screening and confirmed by immunoprecipitation and immunofluorescence; this interaction is relevant to cell cycle and tumor development contexts.","method":"Yeast two-hybrid screening, immunoprecipitation, immunofluorescence","journal":"Tumour biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP confirmation of yeast two-hybrid hit, no functional follow-up on mechanism, single lab","pmids":["27337956"],"is_preprint":false},{"year":2019,"finding":"The histone H4 transcription factor HINFP binds to the promoter region of TSC22D2 and may regulate its transcription, as identified in a multi-cancer pedigree study.","method":"Promoter binding assay (HINFP binding to TSC22D2 promoter region)","journal":"Carcinogenesis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single binding assay, limited mechanistic follow-up, single lab","pmids":["31125406"],"is_preprint":false},{"year":2024,"finding":"Within seconds of hyperosmotic stress, TSC22D family proteins (including TSC22D2), WNK1, and NRBP1 physically associate into biomolecular condensates in a manner dependent on intrinsically disordered regions (IDRs). TSC22D genes co-evolved with a domain in NRBPs (NbrT domain) that specifically binds TSC22D proteins, and this co-evolution is accompanied by IDR length expansion in WNK-family kinases.","method":"Gene co-essentiality analysis, live-cell imaging of condensate formation, proximity labeling, co-IP, evolutionary domain analysis across metazoans, IDR mapping","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-essentiality, live imaging, proximity labeling, Co-IP, evolutionary analysis), replicated across family members","pmids":["38980795"],"is_preprint":false},{"year":2025,"finding":"TSC22D2 is a positive modulator of WNK signaling: it associates with WNK1 and NRBP1 under osmotic stress (confirmed by immunoprecipitation, mass spectrometry, and immunoblotting). AlphaFold-3 modeling predicts TSC22D2/TSC22D4 RΦ-motifs interact with the CCTL1 domain of WNK1 and the CCT domain of NRBP1 within a quaternary complex. NRBP1 directly activates WNK4 in vitro, and knockdown/knockout of NRBP1 markedly inhibits both basal and sorbitol-induced WNK1 activation.","method":"Proximity labeling, immunoprecipitation, mass spectrometry, immunoblotting, in vitro kinase activation assay with recombinant NRBP1 and WNK4, AlphaFold-3 structural modeling, NRBP1 knockdown/knockout","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution of WNK4 activation, reciprocal IP/MS, structural modeling, and genetic KD/KO with defined pathway phenotype, two independent papers from related labs","pmids":["40668933"],"is_preprint":false},{"year":2025,"finding":"TSC22D2 localizes to cytoplasmic biomolecular condensates (WNK bodies) in the distal convoluted tubule (DCT) of the kidney. In HEK293 cells, long TSC22D isoforms (including TSC22D2) increase WNK4 activity. This modulation contributes to NCC phosphorylation and Na+ reabsorption in the kidney DCT.","method":"Subcellular localization (immunofluorescence of WNK bodies), in vitro WNK4 activity assay in HEK293 cells, DCT-specific NRBP1-knockout mouse model with NCC phosphorylation readout","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment tied to functional consequence, in vitro kinase assay, in vivo KO with defined physiological readout, two papers (peer-reviewed + preprint)","pmids":["40668923","39764004"],"is_preprint":false},{"year":2012,"finding":"Loss of Nrbp1 in the mouse intestine results in accumulation of Tsc22d2 protein, suggesting that NRBP1-mediated ubiquitination machinery targets TSC22D2 for degradation.","method":"Somatic deletion of Nrbp1 in mouse intestine with protein accumulation readout; Co-IP of NRBP1 with ubiquitination machinery components","journal":"The EMBO journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — accumulation observed in KO but direct ubiquitination of TSC22D2 not shown; mechanistic inference is indirect, single lab","pmids":["22510880"],"is_preprint":false},{"year":2023,"finding":"Anti-inflammatory miRNAs delivered via macrophage-derived extracellular vesicles directly decrease TSC22D2 expression, which upregulates Treg differentiation via TSC22D2-STAT3 signaling and inhibits M1 macrophage polarization via a TSC22D2-AMPKα-mTOR pathway.","method":"miRNA-mediated knockdown in extracellular vesicle delivery context, in vivo mouse model of sepsis-associated acute liver injury, Treg/M1 macrophage phenotypic readouts","journal":"iScience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement inferred from miRNA knockdown of TSC22D2 with downstream signaling readouts, mechanistic links to STAT3 and AMPKα-mTOR are not directly validated by TSC22D2-specific rescue experiments; single lab","pmids":["37554446"],"is_preprint":false},{"year":2024,"finding":"TSC22D2 interacts with acyl-coenzyme A thioesterase 8 (ACOT8) and maintains ACOT8 protein stability. Overexpression of TSC22D2 promotes ACOT8 expression and inhibits colorectal cancer cell proliferation and metastasis through an EMT mechanism.","method":"Co-immunoprecipitation combined with mass spectrometry, immunoprecipitation, Western blot, CCK-8/colony formation/transwell assays in vitro, subcutaneous mouse tumor model in vivo","journal":"OncoTargets and therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification of ACOT8 interaction plus functional in vitro and in vivo readouts, single lab","pmids":["38476309"],"is_preprint":false}],"current_model":"TSC22D2 is an adaptor protein that, upon hyperosmotic stress, rapidly associates with WNK1 kinase and NRBP1 pseudokinase into IDR-dependent biomolecular condensates (WNK bodies), where it acts as a positive modulator of WNK signaling to regulate cell volume and renal Na+ reabsorption via NCC phosphorylation; additionally, TSC22D2 interacts with PKM2 to suppress nuclear PKM2 and cyclin D1 expression, and with ACOT8 to maintain its stability, both contributing to tumor-suppressive functions in colorectal cancer."},"narrative":{"mechanistic_narrative":"TSC22D2 is a stress-responsive adaptor protein that functions in the WNK kinase osmosensing pathway and exhibits tumor-suppressive activity in colorectal cancer. It was first identified as a hypertonicity-inducible gene whose transcripts are stabilized under hyperosmolality and whose overexpression protects renal cells against osmotic stress [PMID:17147695]. Within seconds of hyperosmotic stress, TSC22D2 associates with WNK1 and the NRBP1 pseudokinase to form intrinsically disordered region (IDR)-dependent biomolecular condensates, a partnership reflected in the co-evolution of TSC22D proteins with an NRBP-encoded binding domain (NbrT) and with IDR expansion in WNK-family kinases [PMID:38980795]. In these WNK bodies, TSC22D2 acts as a positive modulator of WNK signaling: structural modeling places its RΦ-motifs against the WNK1 CCTL1 and NRBP1 CCT domains in a quaternary complex, NRBP1 directly activates WNK4, and the long TSC22D isoforms increase WNK4 activity, driving NCC phosphorylation and Na+ reabsorption in the renal distal convoluted tubule [PMID:40668933, PMID:40668923, PMID:39764004]. Independently, TSC22D2 binds PKM2 to lower nuclear PKM2 and cyclin D1 levels, and binds ACOT8 to maintain its stability, both restraining colorectal cancer cell growth and metastasis [PMID:27573352, PMID:38476309].","teleology":[{"year":2006,"claim":"Established TSC22D2 as a hypertonicity-responsive gene, defining its first physiological context before any partners were known.","evidence":"mRNA stability assay and overexpression cell-survival readout under hyperosmolality vs. permeable osmolytes in mIMCD3 kidney cells","pmids":["17147695"],"confidence":"Medium","gaps":["Did not identify the molecular partners mediating osmoprotection","Mechanism of mRNA stabilization not resolved"]},{"year":2016,"claim":"Identified a tumor-suppressive PKM2-cyclin D1 axis, showing TSC22D2 restrains colorectal cancer growth through a defined protein interaction.","evidence":"Co-IP/MS, immunofluorescence, and overexpression growth assay in colorectal cancer cells","pmids":["27573352"],"confidence":"Medium","gaps":["How TSC22D2 reduces nuclear PKM2 mechanistically is unresolved","No in vivo tumor confirmation in this study"]},{"year":2016,"claim":"Reported a TSC22D2-WDR77 interaction linking the protein to cell cycle/tumor contexts, though without functional dissection.","evidence":"Yeast two-hybrid screen confirmed by Co-IP and immunofluorescence","pmids":["27337956"],"confidence":"Low","gaps":["Single Co-IP confirmation with no functional follow-up","Biological consequence of the interaction undefined"]},{"year":2019,"claim":"Placed TSC22D2 transcription downstream of the histone H4 factor HINFP in a cancer pedigree, hinting at upstream regulatory control.","evidence":"Promoter binding assay of HINFP at the TSC22D2 promoter in a multi-cancer pedigree study","pmids":["31125406"],"confidence":"Low","gaps":["Single binding assay without transcriptional output validation","Functional consequence of HINFP regulation untested"]},{"year":2024,"claim":"Defined the core mechanism: TSC22D2 forms IDR-dependent condensates with WNK1 and NRBP1 within seconds of osmotic stress, establishing it as a structural component of WNK bodies.","evidence":"Co-essentiality analysis, live-cell condensate imaging, proximity labeling, Co-IP, and cross-metazoan evolutionary domain/IDR analysis","pmids":["38980795"],"confidence":"High","gaps":["Did not establish the downstream signaling consequence of condensate formation","Stoichiometry and physical architecture of the condensate not resolved"]},{"year":2025,"claim":"Demonstrated TSC22D2 is a positive modulator of WNK kinase activity, connecting condensate assembly to a defined kinase output.","evidence":"Proximity labeling, IP/MS, immunoblotting, AlphaFold-3 modeling, in vitro NRBP1-WNK4 kinase activation, and NRBP1 KD/KO","pmids":["40668933"],"confidence":"High","gaps":["Predicted RΦ-motif/CCT interactions are modeling-based, not structurally solved","Direct catalytic role of TSC22D2 itself vs. scaffolding distinction incomplete"]},{"year":2025,"claim":"Tied TSC22D2 condensates to renal physiology, showing they localize to DCT WNK bodies and drive NCC phosphorylation and Na+ reabsorption.","evidence":"WNK-body immunofluorescence, in vitro WNK4 activity assay in HEK293, and DCT-specific NRBP1-knockout mouse with NCC phosphorylation readout","pmids":["40668923","39764004"],"confidence":"High","gaps":["TSC22D2-specific (vs. family-redundant) contribution in vivo not isolated","Link between condensate formation and NCC regulation is correlative at the physiological level"]},{"year":2024,"claim":"Extended the tumor-suppressor role to an ACOT8-stability axis governing EMT, proliferation, and metastasis.","evidence":"Co-IP/MS, Western blot, in vitro proliferation/migration assays, and subcutaneous mouse tumor model","pmids":["38476309"],"confidence":"Medium","gaps":["Mechanism by which TSC22D2 stabilizes ACOT8 not defined","Relationship to the PKM2 axis in the same cancer type unexplored"]},{"year":null,"claim":"How TSC22D2's osmotic/WNK-condensate function relates mechanistically to its tumor-suppressive PKM2 and ACOT8 interactions, and whether these reflect one unifying activity, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No study connects the WNK-condensate role with the colorectal cancer interactions","Whether TSC22D2 is itself degraded by NRBP1-associated ubiquitination machinery is only indirectly inferred"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,6]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,6]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[6]}],"complexes":["WNK body (WNK1-NRBP1-TSC22D condensate)"],"partners":["WNK1","NRBP1","WNK4","PKM2","ACOT8","WDR77"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O75157","full_name":"TSC22 domain family protein 2","aliases":["TSC22-related-inducible leucine zipper protein 4"],"length_aa":780,"mass_kda":79.2,"function":"Reduces the level of nuclear PKM isoform M2 which results in repression of cyclin CCND1 transcription and reduced cell growth","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O75157/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TSC22D2","classification":"Not Classified","n_dependent_lines":501,"n_total_lines":1208,"dependency_fraction":0.4147350993377483},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"NRBP1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/TSC22D2","total_profiled":1310},"omim":[{"mim_id":"617724","title":"TSC22 DOMAIN FAMILY, MEMBER 2; TSC22D2","url":"https://www.omim.org/entry/617724"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TSC22D2"},"hgnc":{"alias_symbol":["KIAA0669","TILZ4a","TILZ4b","TILZ4c"],"prev_symbol":[]},"alphafold":{"accession":"O75157","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75157","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75157-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75157-F1-predicted_aligned_error_v6.png","plddt_mean":47.03},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TSC22D2","jax_strain_url":"https://www.jax.org/strain/search?query=TSC22D2"},"sequence":{"accession":"O75157","fasta_url":"https://rest.uniprot.org/uniprotkb/O75157.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75157/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75157"}},"corpus_meta":[{"pmid":"17147695","id":"PMC_17147695","title":"Specific TSC22 domain transcripts are hypertonically induced and alternatively spliced to protect mouse kidney cells during osmotic stress.","date":"2006","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/17147695","citation_count":52,"is_preprint":false},{"pmid":"22510880","id":"PMC_22510880","title":"Nuclear receptor binding protein 1 regulates intestinal progenitor cell homeostasis and tumour formation.","date":"2012","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/22510880","citation_count":46,"is_preprint":false},{"pmid":"27573352","id":"PMC_27573352","title":"TSC22D2 interacts with PKM2 and inhibits cell growth in colorectal cancer.","date":"2016","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/27573352","citation_count":42,"is_preprint":false},{"pmid":"27337956","id":"PMC_27337956","title":"Yeast two-hybrid screening identified WDR77 as a novel interacting partner of TSC22D2.","date":"2016","source":"Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/27337956","citation_count":36,"is_preprint":false},{"pmid":"31125406","id":"PMC_31125406","title":"TSC22D2 identified as a candidate susceptibility gene of multi-cancer pedigree using genome-wide linkage analysis and whole-exome sequencing.","date":"2019","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/31125406","citation_count":29,"is_preprint":false},{"pmid":"30053002","id":"PMC_30053002","title":"Multitrait meta-analysis identified genomic regions associated with sexual precocity in tropical beef cattle.","date":"2018","source":"Journal of animal science","url":"https://pubmed.ncbi.nlm.nih.gov/30053002","citation_count":29,"is_preprint":false},{"pmid":"38980795","id":"PMC_38980795","title":"The TSC22D, WNK, and NRBP gene families exhibit functional buffering and evolved with Metazoa for cell volume regulation.","date":"2024","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/38980795","citation_count":15,"is_preprint":false},{"pmid":"36894917","id":"PMC_36894917","title":"A novel cuproptosis-related gene model predicts outcomes and treatment responses in pancreatic adenocarcinoma.","date":"2023","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/36894917","citation_count":13,"is_preprint":false},{"pmid":"37833839","id":"PMC_37833839","title":"MSI-XGNN: an explainable GNN computational framework integrating transcription- and methylation-level biomarkers for microsatellite instability detection.","date":"2023","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/37833839","citation_count":10,"is_preprint":false},{"pmid":"37554446","id":"PMC_37554446","title":"Roquin-1 resolves sepsis-associated acute liver injury by regulating inflammatory profiles via miRNA cargo in extracellular vesicles.","date":"2023","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/37554446","citation_count":7,"is_preprint":false},{"pmid":"38476309","id":"PMC_38476309","title":"TSC22D2 Regulates ACOT8 to Delay the Malignant Progression of Colorectal Cancer.","date":"2024","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/38476309","citation_count":6,"is_preprint":false},{"pmid":"37070032","id":"PMC_37070032","title":"Deciphering molecular mechanisms of SARS-CoV-2 pathogenesis and drug repurposing through GRN motifs: a comprehensive systems biology study.","date":"2023","source":"3 Biotech","url":"https://pubmed.ncbi.nlm.nih.gov/37070032","citation_count":6,"is_preprint":false},{"pmid":"35100036","id":"PMC_35100036","title":"Specific Regulatory Motifs Network in SARS-CoV-2-Infected Caco-2 Cell Line, as a Model of Gastrointestinal Infections.","date":"2022","source":"Cellular reprogramming","url":"https://pubmed.ncbi.nlm.nih.gov/35100036","citation_count":6,"is_preprint":false},{"pmid":"40668933","id":"PMC_40668933","title":"NRBP1 pseudokinase binds to and activates the WNK pathway in response to osmotic stress.","date":"2025","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/40668933","citation_count":4,"is_preprint":false},{"pmid":"40668923","id":"PMC_40668923","title":"NRBP1 and TSC22D proteins affect distal convoluted tubule physiology through modulation of the WNK pathway.","date":"2025","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/40668923","citation_count":3,"is_preprint":false},{"pmid":"39427309","id":"PMC_39427309","title":"Protocol for CRISPR-based endogenous protein tagging in mammalian cells.","date":"2024","source":"STAR protocols","url":"https://pubmed.ncbi.nlm.nih.gov/39427309","citation_count":1,"is_preprint":false},{"pmid":"39764004","id":"PMC_39764004","title":"NRBP1 and TSC22D proteins impact distal convoluted tubule physiology through modulation of the WNK pathway.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39764004","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11072,"output_tokens":2643,"usd":0.03643,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9843,"output_tokens":2796,"usd":0.059557,"stage2_stop_reason":"end_turn"},"total_usd":0.095987,"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\": 2006,\n      \"finding\": \"All four TSC22D2 splice variants are transiently upregulated by hyperosmolality (hypertonicity signal, not cell-permeable osmolytes) in mouse kidney cells (mIMCD3), and the mechanism of upregulation is mRNA stabilization. Overexpression of TSC22D2-4 conferred protection against osmotic stress, resulting in a 2.7-fold increase in cell survival at 600 mOsmol/kg.\",\n      \"method\": \"mRNA stability assay, overexpression with cell survival readout, hyperosmolality vs. permeable osmolyte treatment in mIMCD3 cells\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (mRNA stability and functional overexpression survival assay), single lab\",\n      \"pmids\": [\"17147695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TSC22D2 physically interacts with pyruvate kinase isoform M2 (PKM2); overexpression of TSC22D2 reduces nuclear PKM2 levels and suppresses cyclin D1 expression, inhibiting colorectal cancer cell growth via a TSC22D2-PKM2-cyclin D1 regulatory axis.\",\n      \"method\": \"Co-immunoprecipitation combined with mass spectrometry, immunoprecipitation, immunofluorescence, overexpression growth assay\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with MS confirmation plus functional downstream readout (cyclin D1, cell growth), single lab\",\n      \"pmids\": [\"27573352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TSC22D2 physically interacts with WDR77 (WD repeat domain 77 protein), as identified by yeast two-hybrid screening and confirmed by immunoprecipitation and immunofluorescence; this interaction is relevant to cell cycle and tumor development contexts.\",\n      \"method\": \"Yeast two-hybrid screening, immunoprecipitation, immunofluorescence\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP confirmation of yeast two-hybrid hit, no functional follow-up on mechanism, single lab\",\n      \"pmids\": [\"27337956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The histone H4 transcription factor HINFP binds to the promoter region of TSC22D2 and may regulate its transcription, as identified in a multi-cancer pedigree study.\",\n      \"method\": \"Promoter binding assay (HINFP binding to TSC22D2 promoter region)\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single binding assay, limited mechanistic follow-up, single lab\",\n      \"pmids\": [\"31125406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Within seconds of hyperosmotic stress, TSC22D family proteins (including TSC22D2), WNK1, and NRBP1 physically associate into biomolecular condensates in a manner dependent on intrinsically disordered regions (IDRs). TSC22D genes co-evolved with a domain in NRBPs (NbrT domain) that specifically binds TSC22D proteins, and this co-evolution is accompanied by IDR length expansion in WNK-family kinases.\",\n      \"method\": \"Gene co-essentiality analysis, live-cell imaging of condensate formation, proximity labeling, co-IP, evolutionary domain analysis across metazoans, IDR mapping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-essentiality, live imaging, proximity labeling, Co-IP, evolutionary analysis), replicated across family members\",\n      \"pmids\": [\"38980795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TSC22D2 is a positive modulator of WNK signaling: it associates with WNK1 and NRBP1 under osmotic stress (confirmed by immunoprecipitation, mass spectrometry, and immunoblotting). AlphaFold-3 modeling predicts TSC22D2/TSC22D4 RΦ-motifs interact with the CCTL1 domain of WNK1 and the CCT domain of NRBP1 within a quaternary complex. NRBP1 directly activates WNK4 in vitro, and knockdown/knockout of NRBP1 markedly inhibits both basal and sorbitol-induced WNK1 activation.\",\n      \"method\": \"Proximity labeling, immunoprecipitation, mass spectrometry, immunoblotting, in vitro kinase activation assay with recombinant NRBP1 and WNK4, AlphaFold-3 structural modeling, NRBP1 knockdown/knockout\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution of WNK4 activation, reciprocal IP/MS, structural modeling, and genetic KD/KO with defined pathway phenotype, two independent papers from related labs\",\n      \"pmids\": [\"40668933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TSC22D2 localizes to cytoplasmic biomolecular condensates (WNK bodies) in the distal convoluted tubule (DCT) of the kidney. In HEK293 cells, long TSC22D isoforms (including TSC22D2) increase WNK4 activity. This modulation contributes to NCC phosphorylation and Na+ reabsorption in the kidney DCT.\",\n      \"method\": \"Subcellular localization (immunofluorescence of WNK bodies), in vitro WNK4 activity assay in HEK293 cells, DCT-specific NRBP1-knockout mouse model with NCC phosphorylation readout\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment tied to functional consequence, in vitro kinase assay, in vivo KO with defined physiological readout, two papers (peer-reviewed + preprint)\",\n      \"pmids\": [\"40668923\", \"39764004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of Nrbp1 in the mouse intestine results in accumulation of Tsc22d2 protein, suggesting that NRBP1-mediated ubiquitination machinery targets TSC22D2 for degradation.\",\n      \"method\": \"Somatic deletion of Nrbp1 in mouse intestine with protein accumulation readout; Co-IP of NRBP1 with ubiquitination machinery components\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — accumulation observed in KO but direct ubiquitination of TSC22D2 not shown; mechanistic inference is indirect, single lab\",\n      \"pmids\": [\"22510880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Anti-inflammatory miRNAs delivered via macrophage-derived extracellular vesicles directly decrease TSC22D2 expression, which upregulates Treg differentiation via TSC22D2-STAT3 signaling and inhibits M1 macrophage polarization via a TSC22D2-AMPKα-mTOR pathway.\",\n      \"method\": \"miRNA-mediated knockdown in extracellular vesicle delivery context, in vivo mouse model of sepsis-associated acute liver injury, Treg/M1 macrophage phenotypic readouts\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement inferred from miRNA knockdown of TSC22D2 with downstream signaling readouts, mechanistic links to STAT3 and AMPKα-mTOR are not directly validated by TSC22D2-specific rescue experiments; single lab\",\n      \"pmids\": [\"37554446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TSC22D2 interacts with acyl-coenzyme A thioesterase 8 (ACOT8) and maintains ACOT8 protein stability. Overexpression of TSC22D2 promotes ACOT8 expression and inhibits colorectal cancer cell proliferation and metastasis through an EMT mechanism.\",\n      \"method\": \"Co-immunoprecipitation combined with mass spectrometry, immunoprecipitation, Western blot, CCK-8/colony formation/transwell assays in vitro, subcutaneous mouse tumor model in vivo\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification of ACOT8 interaction plus functional in vitro and in vivo readouts, single lab\",\n      \"pmids\": [\"38476309\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TSC22D2 is an adaptor protein that, upon hyperosmotic stress, rapidly associates with WNK1 kinase and NRBP1 pseudokinase into IDR-dependent biomolecular condensates (WNK bodies), where it acts as a positive modulator of WNK signaling to regulate cell volume and renal Na+ reabsorption via NCC phosphorylation; additionally, TSC22D2 interacts with PKM2 to suppress nuclear PKM2 and cyclin D1 expression, and with ACOT8 to maintain its stability, both contributing to tumor-suppressive functions in colorectal cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TSC22D2 is a stress-responsive adaptor protein that functions in the WNK kinase osmosensing pathway and exhibits tumor-suppressive activity in colorectal cancer. It was first identified as a hypertonicity-inducible gene whose transcripts are stabilized under hyperosmolality and whose overexpression protects renal cells against osmotic stress [#0]. Within seconds of hyperosmotic stress, TSC22D2 associates with WNK1 and the NRBP1 pseudokinase to form intrinsically disordered region (IDR)-dependent biomolecular condensates, a partnership reflected in the co-evolution of TSC22D proteins with an NRBP-encoded binding domain (NbrT) and with IDR expansion in WNK-family kinases [#4]. In these WNK bodies, TSC22D2 acts as a positive modulator of WNK signaling: structural modeling places its RΦ-motifs against the WNK1 CCTL1 and NRBP1 CCT domains in a quaternary complex, NRBP1 directly activates WNK4, and the long TSC22D isoforms increase WNK4 activity, driving NCC phosphorylation and Na+ reabsorption in the renal distal convoluted tubule [#5, #6]. Independently, TSC22D2 binds PKM2 to lower nuclear PKM2 and cyclin D1 levels, and binds ACOT8 to maintain its stability, both restraining colorectal cancer cell growth and metastasis [#1, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established TSC22D2 as a hypertonicity-responsive gene, defining its first physiological context before any partners were known.\",\n      \"evidence\": \"mRNA stability assay and overexpression cell-survival readout under hyperosmolality vs. permeable osmolytes in mIMCD3 kidney cells\",\n      \"pmids\": [\"17147695\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the molecular partners mediating osmoprotection\", \"Mechanism of mRNA stabilization not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified a tumor-suppressive PKM2-cyclin D1 axis, showing TSC22D2 restrains colorectal cancer growth through a defined protein interaction.\",\n      \"evidence\": \"Co-IP/MS, immunofluorescence, and overexpression growth assay in colorectal cancer cells\",\n      \"pmids\": [\"27573352\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How TSC22D2 reduces nuclear PKM2 mechanistically is unresolved\", \"No in vivo tumor confirmation in this study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reported a TSC22D2-WDR77 interaction linking the protein to cell cycle/tumor contexts, though without functional dissection.\",\n      \"evidence\": \"Yeast two-hybrid screen confirmed by Co-IP and immunofluorescence\",\n      \"pmids\": [\"27337956\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP confirmation with no functional follow-up\", \"Biological consequence of the interaction undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed TSC22D2 transcription downstream of the histone H4 factor HINFP in a cancer pedigree, hinting at upstream regulatory control.\",\n      \"evidence\": \"Promoter binding assay of HINFP at the TSC22D2 promoter in a multi-cancer pedigree study\",\n      \"pmids\": [\"31125406\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single binding assay without transcriptional output validation\", \"Functional consequence of HINFP regulation untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the core mechanism: TSC22D2 forms IDR-dependent condensates with WNK1 and NRBP1 within seconds of osmotic stress, establishing it as a structural component of WNK bodies.\",\n      \"evidence\": \"Co-essentiality analysis, live-cell condensate imaging, proximity labeling, Co-IP, and cross-metazoan evolutionary domain/IDR analysis\",\n      \"pmids\": [\"38980795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the downstream signaling consequence of condensate formation\", \"Stoichiometry and physical architecture of the condensate not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated TSC22D2 is a positive modulator of WNK kinase activity, connecting condensate assembly to a defined kinase output.\",\n      \"evidence\": \"Proximity labeling, IP/MS, immunoblotting, AlphaFold-3 modeling, in vitro NRBP1-WNK4 kinase activation, and NRBP1 KD/KO\",\n      \"pmids\": [\"40668933\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Predicted RΦ-motif/CCT interactions are modeling-based, not structurally solved\", \"Direct catalytic role of TSC22D2 itself vs. scaffolding distinction incomplete\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Tied TSC22D2 condensates to renal physiology, showing they localize to DCT WNK bodies and drive NCC phosphorylation and Na+ reabsorption.\",\n      \"evidence\": \"WNK-body immunofluorescence, in vitro WNK4 activity assay in HEK293, and DCT-specific NRBP1-knockout mouse with NCC phosphorylation readout\",\n      \"pmids\": [\"40668923\", \"39764004\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"TSC22D2-specific (vs. family-redundant) contribution in vivo not isolated\", \"Link between condensate formation and NCC regulation is correlative at the physiological level\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended the tumor-suppressor role to an ACOT8-stability axis governing EMT, proliferation, and metastasis.\",\n      \"evidence\": \"Co-IP/MS, Western blot, in vitro proliferation/migration assays, and subcutaneous mouse tumor model\",\n      \"pmids\": [\"38476309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TSC22D2 stabilizes ACOT8 not defined\", \"Relationship to the PKM2 axis in the same cancer type unexplored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TSC22D2's osmotic/WNK-condensate function relates mechanistically to its tumor-suppressive PKM2 and ACOT8 interactions, and whether these reflect one unifying activity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No study connects the WNK-condensate role with the colorectal cancer interactions\", \"Whether TSC22D2 is itself degraded by NRBP1-associated ubiquitination machinery is only indirectly inferred\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\"WNK body (WNK1-NRBP1-TSC22D condensate)\"],\n    \"partners\": [\"WNK1\", \"NRBP1\", \"WNK4\", \"PKM2\", \"ACOT8\", \"WDR77\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}