{"gene":"TMSB4X","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2022,"finding":"TMSB4X physically interacts with TAGLN2 (wild-type) but not with the succinylation-deficient TAGLN2K40A mutant, as detected by co-localization via immunofluorescence and interaction assay, placing TMSB4X downstream of K40 succinylation of TAGLN2 in a pathway that controls glioma cell proliferation and migration; inhibition of TMSB4X attenuated the pro-proliferative/migratory effects induced by TAGLN2 K40 succinylation.","method":"Immunofluorescence co-localization, interaction assay comparing TAGLN2WT vs. TAGLN2K40A mutant, TMSB4X knockdown with phenotypic readout (proliferation/migration assays)","journal":"Cancer gene therapy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization and interaction assay in single lab, supported by functional rescue experiment with TMSB4X knockdown","pmids":["36131066"],"is_preprint":false},{"year":2021,"finding":"Exogenous Tβ4 (TMSB4X protein) enhances HIF-1α protein levels and phosphorylated HIF-1α via the AKT pathway, and suppresses prolyl hydroxylase domain protein (PHD) expression, thereby reducing HIF-1α degradation; this was blocked by the FIH promoter YC-1, placing TMSB4X upstream of PHD/FIH-mediated HIF-1α stabilization.","method":"In vitro treatment of BMMSCs with exogenous Tβ4 protein; pharmacological inhibition with YC-1 (FIH promoter) and FG-4497 (PHD inhibitor); Western blot for HIF-1α and p-HIF-1α","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis with two inhibitors and protein-level readout, single lab","pmids":["34178995"],"is_preprint":false},{"year":2021,"finding":"Silencing of TMSB4X expression in A375 melanoma cells reorganizes the actin cytoskeleton and causes subcellular relocalization of intermediate filament proteins Nestin and Vimentin, resulting in measurable changes in cell topology, height, and stiffness (Young's modulus), establishing a functional link between TMSB4X and cytoskeletal/biomechanical regulation.","method":"Stable TMSB4X-silenced clones, fluorescence imaging of cytoskeleton, atomic force microscopy for Young's modulus, soft-agar colony formation, in vivo tumor formation","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (AFM, imaging, in vivo), single lab","pmids":["33807338"],"is_preprint":false},{"year":2018,"finding":"Tmsb4X is upregulated in Crybb2-mutant mouse brain and co-localizes with Crybb2 at actin-enriched cell ruffles; overexpression of Tmsb4X in cultured hippocampal neurons inhibits dendritogenesis, phenocopying Crybb2 knockdown, indicating that Tmsb4X acts downstream of or in concert with Crybb2 to negatively regulate dendrite morphogenesis.","method":"Expression arrays in Crybb2 mutant brain, immunofluorescence co-localization, Tmsb4X overexpression in primary hippocampal neurons with dendrite morphology readout in vitro and in vivo","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (phenocopy of Crybb2 KD by Tmsb4X OE), co-localization, single lab","pmids":["29864422"],"is_preprint":false},{"year":2022,"finding":"Overexpression of TMSB4X in prostatic fibroblasts decreases their migration, protects them from adopting a cancer-associated fibroblast (CAF)-like phenotype (reduced PDGFRB expression) when co-cultured with prostate cancer cells, and decreases migration of co-cultured PC3 prostate cancer cells, establishing TMSB4X as a regulator of fibroblast reprogramming and intercellular crosstalk in the prostate tumor microenvironment.","method":"Retroviral overexpression of TMSB4X in WPMY-1 fibroblasts co-cultured with PC3 cells; Transwell and random migration assays; indirect immunofluorescence for CAF markers; CTAP-MS proteomics","journal":"Cellular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional overexpression with multiple readouts (migration, marker expression, proteomics), single lab","pmids":["36169805"],"is_preprint":false},{"year":2022,"finding":"Tmsb4x promotes differentiation of peripheral blood mononuclear cells into dendritic cells; silencing Tmsb4x reduces DC proportion and increases inflammatory response and apoptosis, while restoring Tmsb4x expression rescues DC differentiation in both lipopolysaccharide-stimulated cell models and a mouse septicemia model.","method":"Tmsb4x siRNA silencing and re-expression in LPS-stimulated mononuclear cells; flow cytometry for DC proportion; cytokine measurement; in vivo mouse septicemia model","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with multiple readouts in vitro and in vivo, single lab","pmids":["35932611"],"is_preprint":false},{"year":2024,"finding":"TMSB4X overexpression promotes proliferation, migration, and invasion of hepatocellular carcinoma cells and represses ferroptosis, as measured by ferroptosis marker changes on Western blot and cell viability/invasion assays; TMSB4X knockdown produced the opposite effects.","method":"TMSB4X overexpression and knockdown in HCC cell lines; CCK-8, Transwell, flow cytometry assays; Western blot for ferroptosis markers","journal":"Discover oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, gain/loss-of-function with phenotypic readout but no defined molecular mechanism for ferroptosis suppression","pmids":["39556271"],"is_preprint":false},{"year":2025,"finding":"ABCA4 may interact with TMSB4X to regulate mitophagy via the AMPK pathway in lung adenocarcinoma; ABCA4 knockdown increased AMPK phosphorylation and mitophagy, effects partially reversed by chloroquine or S7306, and RNA-seq identified TMSB4X as a differentially expressed gene downstream of ABCA4.","method":"ABCA4 siRNA knockdown; RNA-seq for DEGs; Western blot for AMPK phosphorylation and mitophagy markers; pharmacological rescue with CQ and S7306; transmission electron microscopy","journal":"International immunopharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — TMSB4X identified as downstream DEG with inferred interaction; direct mechanistic role of TMSB4X itself not experimentally validated in this study","pmids":["40753852"],"is_preprint":false},{"year":2013,"finding":"TMSB4X expression in rat epididymis is positively regulated by testosterone: castration or Leydig cell elimination by EDS significantly reduced Tmsb4x expression, while testosterone propionate replacement rescued expression, demonstrating androgen-dependent transcriptional regulation of TMSB4X in reproductive tissues.","method":"In vivo rat models of castration, EDS-mediated Leydig cell ablation, and cryptorchidism with testosterone propionate rescue; quantitative expression analysis","journal":"Journal of experimental zoology. Part A, Ecological genetics and physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo genetic/pharmacological manipulations with consistent expression readout, single lab","pmids":["24039044"],"is_preprint":false}],"current_model":"TMSB4X (Thymosin β4) is an actin-sequestering/binding protein that regulates actin cytoskeleton organization and cell biomechanics, acts upstream of HIF-1α stabilization via the AKT/PHD/FIH axis to promote angiogenesis, interacts with TAGLN2 in a succinylation-dependent manner to influence glioma cell behavior, negatively regulates dendritogenesis in hippocampal neurons, promotes mononuclear cell differentiation into dendritic cells, protects fibroblasts from cancer-associated reprogramming, and is transcriptionally regulated by androgens in reproductive tissues."},"narrative":{"mechanistic_narrative":"TMSB4X (Thymosin β4) is a regulator of actin cytoskeletal organization and cell biomechanics whose modulation alters cytoskeletal architecture, intermediate filament localization, and mechanical properties of cells [PMID:33807338]. Through its cytoskeletal activity it negatively regulates dendrite morphogenesis, co-localizing with Crybb2 at actin-enriched cell ruffles and inhibiting dendritogenesis when overexpressed in hippocampal neurons [PMID:29864422]. TMSB4X also acts in cell signaling and tissue remodeling: exogenous Tβ4 stabilizes HIF-1α by enhancing AKT-dependent phosphorylation and suppressing PHD expression, positioning it upstream of the PHD/FIH axis [PMID:34178995]. In tumor contexts it engages succinylation-dependent interaction with TAGLN2 to promote glioma proliferation and migration [PMID:36131066], and it restrains the reprogramming of prostatic fibroblasts toward a cancer-associated phenotype while reducing fibroblast and co-cultured cancer cell migration [PMID:36169805]. In immune regulation, TMSB4X promotes differentiation of mononuclear cells into dendritic cells and limits inflammatory and apoptotic responses [PMID:35932611]. Its expression is androgen-dependent in reproductive tissue, being driven by testosterone in the epididymis [PMID:24039044]. Beyond these contexts, the molecular details of how TMSB4X executes each role have not been further resolved in the available corpus.","teleology":[{"year":2013,"claim":"Established that TMSB4X expression is hormonally controlled, identifying androgen signaling as an upstream regulator of the gene in reproductive tissue.","evidence":"In vivo rat castration, Leydig cell ablation, and testosterone propionate rescue with expression readout","pmids":["24039044"],"confidence":"Medium","gaps":["No identification of the transcription factors or androgen-responsive elements mediating regulation","Functional consequence of TMSB4X in epididymis not addressed"]},{"year":2018,"claim":"Connected TMSB4X to neuronal morphogenesis, showing it acts at actin-rich structures to negatively regulate dendritogenesis in concert with Crybb2.","evidence":"Expression arrays in Crybb2-mutant brain, co-localization, and Tmsb4X overexpression in primary hippocampal neurons","pmids":["29864422"],"confidence":"Medium","gaps":["Direct physical interaction between Tmsb4X and Crybb2 not demonstrated biochemically","Molecular mechanism linking actin sequestration to dendrite suppression unresolved"]},{"year":2021,"claim":"Demonstrated that TMSB4X loss reorganizes the actin cytoskeleton and alters intermediate filament localization and cell stiffness, providing direct biomechanical evidence for its cytoskeletal role.","evidence":"Stable TMSB4X-silenced melanoma clones analyzed by atomic force microscopy, fluorescence imaging, and in vivo tumor formation","pmids":["33807338"],"confidence":"Medium","gaps":["Mechanistic basis for Nestin/Vimentin relocalization not defined","Relationship between biomechanical changes and tumorigenicity not dissected"]},{"year":2021,"claim":"Placed TMSB4X upstream of HIF-1α stabilization, defining a signaling role via AKT and the PHD/FIH oxygen-sensing axis distinct from its structural cytoskeletal function.","evidence":"Exogenous Tβ4 treatment of BMMSCs with pharmacological epistasis (YC-1, FG-4497) and Western blot for HIF-1α/p-HIF-1α","pmids":["34178995"],"confidence":"Medium","gaps":["No receptor or direct binding partner linking extracellular Tβ4 to AKT identified","Whether the effect requires the actin-binding activity of TMSB4X is unknown"]},{"year":2022,"claim":"Identified a succinylation-dependent TMSB4X–TAGLN2 interaction controlling glioma proliferation and migration, linking a post-translational modification to TMSB4X recruitment.","evidence":"Immunofluorescence co-localization and interaction assay comparing TAGLN2WT vs K40A mutant, with TMSB4X knockdown phenotypic rescue","pmids":["36131066"],"confidence":"Medium","gaps":["Direct binding interface not mapped","Reciprocal validation of the interaction not shown"]},{"year":2022,"claim":"Showed TMSB4X restrains cancer-associated fibroblast reprogramming and intercellular migration in the prostate tumor microenvironment, extending its role to stromal cell crosstalk.","evidence":"Retroviral TMSB4X overexpression in WPMY-1 fibroblasts co-cultured with PC3 cells; migration assays, CAF marker IF, CTAP-MS proteomics","pmids":["36169805"],"confidence":"Medium","gaps":["Molecular pathway connecting TMSB4X to PDGFRB suppression unresolved","Secreted signals mediating cancer cell migration changes not identified"]},{"year":2022,"claim":"Established TMSB4X as a promoter of dendritic cell differentiation that limits inflammation and apoptosis, defining an immunoregulatory function.","evidence":"Tmsb4x siRNA silencing and re-expression in LPS-stimulated mononuclear cells, flow cytometry, cytokine measurement, and mouse septicemia model","pmids":["35932611"],"confidence":"Medium","gaps":["Molecular mechanism driving DC differentiation not defined","Direct targets of TMSB4X in this pathway unknown"]},{"year":2024,"claim":"Associated TMSB4X with hepatocellular carcinoma progression and ferroptosis suppression, broadening its tumor-promoting contexts.","evidence":"TMSB4X overexpression and knockdown in HCC cell lines with viability, invasion, and ferroptosis marker assays","pmids":["39556271"],"confidence":"Low","gaps":["No defined molecular mechanism for ferroptosis suppression","Single-lab phenotypic study without mechanistic validation"]},{"year":2025,"claim":"Identified TMSB4X as a downstream effector candidate of ABCA4 in AMPK-dependent mitophagy in lung adenocarcinoma.","evidence":"ABCA4 siRNA knockdown, RNA-seq for DEGs, Western blot for AMPK/mitophagy markers, pharmacological rescue, and electron microscopy","pmids":["40753852"],"confidence":"Low","gaps":["TMSB4X identified only as a downstream DEG with inferred interaction","Direct mechanistic role of TMSB4X not experimentally validated"]},{"year":null,"claim":"How TMSB4X's core actin-binding activity mechanistically connects its diverse context-specific roles in signaling, immunity, and tumor biology remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model linking actin sequestration to HIF-1α, dendritic, or immune functions","Direct partners and recruitment mechanisms in most contexts uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,3]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,3]}],"pathway":[],"complexes":[],"partners":["TAGLN2","CRYBB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62328","full_name":"Thymosin beta-4","aliases":["Fx"],"length_aa":44,"mass_kda":5.1,"function":"Plays an important role in the organization of the cytoskeleton (PubMed:10848969, PubMed:1999398). Binds to and sequesters actin monomers (G actin) and therefore inhibits actin polymerization (PubMed:10848969, PubMed:1999398) Potent inhibitor of bone marrow derived stem cell differentiation (PubMed:7694679). Acts by inhibits the entry of hematopoietic pluripotent stem cells into the S-phase (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/P62328/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TMSB4X","classification":"Not Classified","n_dependent_lines":48,"n_total_lines":1046,"dependency_fraction":0.045889101338432124},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"INPPL1","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/TMSB4X","total_profiled":1310},"omim":[{"mim_id":"619762","title":"KURY-ISIDOR SYNDROME; KURIS","url":"https://www.omim.org/entry/619762"},{"mim_id":"603089","title":"BRCA1-ASSOCIATED PROTEIN 1; BAP1","url":"https://www.omim.org/entry/603089"},{"mim_id":"300159","title":"THYMOSIN, BETA-4, X CHROMOSOME; TMSB4X","url":"https://www.omim.org/entry/300159"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TMSB4X"},"hgnc":{"alias_symbol":["TB4X"],"prev_symbol":["TMSB4"]},"alphafold":{"accession":"P62328","domains":[{"cath_id":"-","chopping":"6-42","consensus_level":"medium","plddt":85.1819,"start":6,"end":42}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P62328","model_url":"https://alphafold.ebi.ac.uk/files/AF-P62328-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P62328-F1-predicted_aligned_error_v6.png","plddt_mean":80.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TMSB4X","jax_strain_url":"https://www.jax.org/strain/search?query=TMSB4X"},"sequence":{"accession":"P62328","fasta_url":"https://rest.uniprot.org/uniprotkb/P62328.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P62328/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P62328"}},"corpus_meta":[{"pmid":"27469625","id":"PMC_27469625","title":"The TMSB4 Pseudogene LncRNA Functions as a Competing Endogenous RNA to Promote Cartilage Degradation in Human Osteoarthritis.","date":"2016","source":"Molecular therapy : the journal of the American Society of Gene Therapy","url":"https://pubmed.ncbi.nlm.nih.gov/27469625","citation_count":62,"is_preprint":false},{"pmid":"36131066","id":"PMC_36131066","title":"Lysine-40 succinylation of TAGLN2 induces glioma angiogenesis and tumor growth through regulating TMSB4X.","date":"2022","source":"Cancer gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/36131066","citation_count":18,"is_preprint":false},{"pmid":"34178995","id":"PMC_34178995","title":"TMSB4 Overexpression Enhances the Potency of Marrow Mesenchymal Stromal Cells for Myocardial Repair.","date":"2021","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/34178995","citation_count":10,"is_preprint":false},{"pmid":"33807338","id":"PMC_33807338","title":"Changes in Biomechanical Properties of A375 Cells Due to the Silencing of TMSB4X Expression Are Not Directly Correlated with Alterations in Their Stemness Features.","date":"2021","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/33807338","citation_count":10,"is_preprint":false},{"pmid":"29864422","id":"PMC_29864422","title":"Crybb2 associates with Tmsb4X and is crucial for dendrite morphogenesis.","date":"2018","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/29864422","citation_count":9,"is_preprint":false},{"pmid":"34546850","id":"PMC_34546850","title":"Circular RNA PIP5K1A (circPIP5K1A) accelerates endometriosis progression by regulating the miR-153-3p/Thymosin Beta-4 X-Linked (TMSB4X) pathway.","date":"2021","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/34546850","citation_count":9,"is_preprint":false},{"pmid":"35932611","id":"PMC_35932611","title":"Promoting effect of Tmsb4x on the differentiation of peripheral blood mononuclear cells to dendritic cells during septicemia.","date":"2022","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35932611","citation_count":9,"is_preprint":false},{"pmid":"24039044","id":"PMC_24039044","title":"Comparative expression and regulation of TMSB4X in male reproductive tissues of rats and chickens.","date":"2013","source":"Journal of experimental zoology. Part A, Ecological genetics and physiology","url":"https://pubmed.ncbi.nlm.nih.gov/24039044","citation_count":8,"is_preprint":false},{"pmid":"39556271","id":"PMC_39556271","title":"TMSB4X is a regulator of inflammation-associated ferroptosis, and promotes the proliferation, migration and invasion of hepatocellular carcinoma cells.","date":"2024","source":"Discover oncology","url":"https://pubmed.ncbi.nlm.nih.gov/39556271","citation_count":6,"is_preprint":false},{"pmid":"36169805","id":"PMC_36169805","title":"Proteomic characterisation of prostate cancer intercellular communication reveals cell type-selective signalling and TMSB4X-dependent fibroblast reprogramming.","date":"2022","source":"Cellular oncology (Dordrecht, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/36169805","citation_count":5,"is_preprint":false},{"pmid":"40753852","id":"PMC_40753852","title":"ABCA4 regulates mitophagy in lung adenocarcinoma progression via AMPK pathway by modulating TMSB4X.","date":"2025","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40753852","citation_count":1,"is_preprint":false},{"pmid":"42177276","id":"PMC_42177276","title":"The implications of TMSB4X in TIM3 hypermethylation and CD8+ T cell exhaustion in diffuse large B-cell lymphoma.","date":"2026","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/42177276","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.11.20.25337809","title":"Rare case of Pediatric Male Secretory Breast Carcinoma: An Integrative study with Genomic and Transcriptomic analysis","date":"2025-11-22","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.20.25337809","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.17.24315623","title":"Identification of Shared and Unique Key Biomarkers of Alcohol Liver Cirrhosis and Non-Alcoholic Steatohepatitis Through Machine Learning Network-Based Algorithms","date":"2024-10-18","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.17.24315623","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10278,"output_tokens":2524,"usd":0.034347,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9709,"output_tokens":2949,"usd":0.061135,"stage2_stop_reason":"end_turn"},"total_usd":0.095482,"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\": 2022,\n      \"finding\": \"TMSB4X physically interacts with TAGLN2 (wild-type) but not with the succinylation-deficient TAGLN2K40A mutant, as detected by co-localization via immunofluorescence and interaction assay, placing TMSB4X downstream of K40 succinylation of TAGLN2 in a pathway that controls glioma cell proliferation and migration; inhibition of TMSB4X attenuated the pro-proliferative/migratory effects induced by TAGLN2 K40 succinylation.\",\n      \"method\": \"Immunofluorescence co-localization, interaction assay comparing TAGLN2WT vs. TAGLN2K40A mutant, TMSB4X knockdown with phenotypic readout (proliferation/migration assays)\",\n      \"journal\": \"Cancer gene therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization and interaction assay in single lab, supported by functional rescue experiment with TMSB4X knockdown\",\n      \"pmids\": [\"36131066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Exogenous Tβ4 (TMSB4X protein) enhances HIF-1α protein levels and phosphorylated HIF-1α via the AKT pathway, and suppresses prolyl hydroxylase domain protein (PHD) expression, thereby reducing HIF-1α degradation; this was blocked by the FIH promoter YC-1, placing TMSB4X upstream of PHD/FIH-mediated HIF-1α stabilization.\",\n      \"method\": \"In vitro treatment of BMMSCs with exogenous Tβ4 protein; pharmacological inhibition with YC-1 (FIH promoter) and FG-4497 (PHD inhibitor); Western blot for HIF-1α and p-HIF-1α\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis with two inhibitors and protein-level readout, single lab\",\n      \"pmids\": [\"34178995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Silencing of TMSB4X expression in A375 melanoma cells reorganizes the actin cytoskeleton and causes subcellular relocalization of intermediate filament proteins Nestin and Vimentin, resulting in measurable changes in cell topology, height, and stiffness (Young's modulus), establishing a functional link between TMSB4X and cytoskeletal/biomechanical regulation.\",\n      \"method\": \"Stable TMSB4X-silenced clones, fluorescence imaging of cytoskeleton, atomic force microscopy for Young's modulus, soft-agar colony formation, in vivo tumor formation\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (AFM, imaging, in vivo), single lab\",\n      \"pmids\": [\"33807338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tmsb4X is upregulated in Crybb2-mutant mouse brain and co-localizes with Crybb2 at actin-enriched cell ruffles; overexpression of Tmsb4X in cultured hippocampal neurons inhibits dendritogenesis, phenocopying Crybb2 knockdown, indicating that Tmsb4X acts downstream of or in concert with Crybb2 to negatively regulate dendrite morphogenesis.\",\n      \"method\": \"Expression arrays in Crybb2 mutant brain, immunofluorescence co-localization, Tmsb4X overexpression in primary hippocampal neurons with dendrite morphology readout in vitro and in vivo\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (phenocopy of Crybb2 KD by Tmsb4X OE), co-localization, single lab\",\n      \"pmids\": [\"29864422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Overexpression of TMSB4X in prostatic fibroblasts decreases their migration, protects them from adopting a cancer-associated fibroblast (CAF)-like phenotype (reduced PDGFRB expression) when co-cultured with prostate cancer cells, and decreases migration of co-cultured PC3 prostate cancer cells, establishing TMSB4X as a regulator of fibroblast reprogramming and intercellular crosstalk in the prostate tumor microenvironment.\",\n      \"method\": \"Retroviral overexpression of TMSB4X in WPMY-1 fibroblasts co-cultured with PC3 cells; Transwell and random migration assays; indirect immunofluorescence for CAF markers; CTAP-MS proteomics\",\n      \"journal\": \"Cellular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional overexpression with multiple readouts (migration, marker expression, proteomics), single lab\",\n      \"pmids\": [\"36169805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tmsb4x promotes differentiation of peripheral blood mononuclear cells into dendritic cells; silencing Tmsb4x reduces DC proportion and increases inflammatory response and apoptosis, while restoring Tmsb4x expression rescues DC differentiation in both lipopolysaccharide-stimulated cell models and a mouse septicemia model.\",\n      \"method\": \"Tmsb4x siRNA silencing and re-expression in LPS-stimulated mononuclear cells; flow cytometry for DC proportion; cytokine measurement; in vivo mouse septicemia model\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with multiple readouts in vitro and in vivo, single lab\",\n      \"pmids\": [\"35932611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TMSB4X overexpression promotes proliferation, migration, and invasion of hepatocellular carcinoma cells and represses ferroptosis, as measured by ferroptosis marker changes on Western blot and cell viability/invasion assays; TMSB4X knockdown produced the opposite effects.\",\n      \"method\": \"TMSB4X overexpression and knockdown in HCC cell lines; CCK-8, Transwell, flow cytometry assays; Western blot for ferroptosis markers\",\n      \"journal\": \"Discover oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, gain/loss-of-function with phenotypic readout but no defined molecular mechanism for ferroptosis suppression\",\n      \"pmids\": [\"39556271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ABCA4 may interact with TMSB4X to regulate mitophagy via the AMPK pathway in lung adenocarcinoma; ABCA4 knockdown increased AMPK phosphorylation and mitophagy, effects partially reversed by chloroquine or S7306, and RNA-seq identified TMSB4X as a differentially expressed gene downstream of ABCA4.\",\n      \"method\": \"ABCA4 siRNA knockdown; RNA-seq for DEGs; Western blot for AMPK phosphorylation and mitophagy markers; pharmacological rescue with CQ and S7306; transmission electron microscopy\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — TMSB4X identified as downstream DEG with inferred interaction; direct mechanistic role of TMSB4X itself not experimentally validated in this study\",\n      \"pmids\": [\"40753852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TMSB4X expression in rat epididymis is positively regulated by testosterone: castration or Leydig cell elimination by EDS significantly reduced Tmsb4x expression, while testosterone propionate replacement rescued expression, demonstrating androgen-dependent transcriptional regulation of TMSB4X in reproductive tissues.\",\n      \"method\": \"In vivo rat models of castration, EDS-mediated Leydig cell ablation, and cryptorchidism with testosterone propionate rescue; quantitative expression analysis\",\n      \"journal\": \"Journal of experimental zoology. Part A, Ecological genetics and physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo genetic/pharmacological manipulations with consistent expression readout, single lab\",\n      \"pmids\": [\"24039044\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TMSB4X (Thymosin β4) is an actin-sequestering/binding protein that regulates actin cytoskeleton organization and cell biomechanics, acts upstream of HIF-1α stabilization via the AKT/PHD/FIH axis to promote angiogenesis, interacts with TAGLN2 in a succinylation-dependent manner to influence glioma cell behavior, negatively regulates dendritogenesis in hippocampal neurons, promotes mononuclear cell differentiation into dendritic cells, protects fibroblasts from cancer-associated reprogramming, and is transcriptionally regulated by androgens in reproductive tissues.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TMSB4X (Thymosin β4) is a regulator of actin cytoskeletal organization and cell biomechanics whose modulation alters cytoskeletal architecture, intermediate filament localization, and mechanical properties of cells [#2]. Through its cytoskeletal activity it negatively regulates dendrite morphogenesis, co-localizing with Crybb2 at actin-enriched cell ruffles and inhibiting dendritogenesis when overexpressed in hippocampal neurons [#3]. TMSB4X also acts in cell signaling and tissue remodeling: exogenous Tβ4 stabilizes HIF-1α by enhancing AKT-dependent phosphorylation and suppressing PHD expression, positioning it upstream of the PHD/FIH axis [#1]. In tumor contexts it engages succinylation-dependent interaction with TAGLN2 to promote glioma proliferation and migration [#0], and it restrains the reprogramming of prostatic fibroblasts toward a cancer-associated phenotype while reducing fibroblast and co-cultured cancer cell migration [#4]. In immune regulation, TMSB4X promotes differentiation of mononuclear cells into dendritic cells and limits inflammatory and apoptotic responses [#5]. Its expression is androgen-dependent in reproductive tissue, being driven by testosterone in the epididymis [#8]. Beyond these contexts, the molecular details of how TMSB4X executes each role have not been further resolved in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that TMSB4X expression is hormonally controlled, identifying androgen signaling as an upstream regulator of the gene in reproductive tissue.\",\n      \"evidence\": \"In vivo rat castration, Leydig cell ablation, and testosterone propionate rescue with expression readout\",\n      \"pmids\": [\"24039044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identification of the transcription factors or androgen-responsive elements mediating regulation\", \"Functional consequence of TMSB4X in epididymis not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected TMSB4X to neuronal morphogenesis, showing it acts at actin-rich structures to negatively regulate dendritogenesis in concert with Crybb2.\",\n      \"evidence\": \"Expression arrays in Crybb2-mutant brain, co-localization, and Tmsb4X overexpression in primary hippocampal neurons\",\n      \"pmids\": [\"29864422\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between Tmsb4X and Crybb2 not demonstrated biochemically\", \"Molecular mechanism linking actin sequestration to dendrite suppression unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated that TMSB4X loss reorganizes the actin cytoskeleton and alters intermediate filament localization and cell stiffness, providing direct biomechanical evidence for its cytoskeletal role.\",\n      \"evidence\": \"Stable TMSB4X-silenced melanoma clones analyzed by atomic force microscopy, fluorescence imaging, and in vivo tumor formation\",\n      \"pmids\": [\"33807338\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis for Nestin/Vimentin relocalization not defined\", \"Relationship between biomechanical changes and tumorigenicity not dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Placed TMSB4X upstream of HIF-1α stabilization, defining a signaling role via AKT and the PHD/FIH oxygen-sensing axis distinct from its structural cytoskeletal function.\",\n      \"evidence\": \"Exogenous Tβ4 treatment of BMMSCs with pharmacological epistasis (YC-1, FG-4497) and Western blot for HIF-1α/p-HIF-1α\",\n      \"pmids\": [\"34178995\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No receptor or direct binding partner linking extracellular Tβ4 to AKT identified\", \"Whether the effect requires the actin-binding activity of TMSB4X is unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a succinylation-dependent TMSB4X–TAGLN2 interaction controlling glioma proliferation and migration, linking a post-translational modification to TMSB4X recruitment.\",\n      \"evidence\": \"Immunofluorescence co-localization and interaction assay comparing TAGLN2WT vs K40A mutant, with TMSB4X knockdown phenotypic rescue\",\n      \"pmids\": [\"36131066\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface not mapped\", \"Reciprocal validation of the interaction not shown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed TMSB4X restrains cancer-associated fibroblast reprogramming and intercellular migration in the prostate tumor microenvironment, extending its role to stromal cell crosstalk.\",\n      \"evidence\": \"Retroviral TMSB4X overexpression in WPMY-1 fibroblasts co-cultured with PC3 cells; migration assays, CAF marker IF, CTAP-MS proteomics\",\n      \"pmids\": [\"36169805\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway connecting TMSB4X to PDGFRB suppression unresolved\", \"Secreted signals mediating cancer cell migration changes not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established TMSB4X as a promoter of dendritic cell differentiation that limits inflammation and apoptosis, defining an immunoregulatory function.\",\n      \"evidence\": \"Tmsb4x siRNA silencing and re-expression in LPS-stimulated mononuclear cells, flow cytometry, cytokine measurement, and mouse septicemia model\",\n      \"pmids\": [\"35932611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism driving DC differentiation not defined\", \"Direct targets of TMSB4X in this pathway unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Associated TMSB4X with hepatocellular carcinoma progression and ferroptosis suppression, broadening its tumor-promoting contexts.\",\n      \"evidence\": \"TMSB4X overexpression and knockdown in HCC cell lines with viability, invasion, and ferroptosis marker assays\",\n      \"pmids\": [\"39556271\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No defined molecular mechanism for ferroptosis suppression\", \"Single-lab phenotypic study without mechanistic validation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified TMSB4X as a downstream effector candidate of ABCA4 in AMPK-dependent mitophagy in lung adenocarcinoma.\",\n      \"evidence\": \"ABCA4 siRNA knockdown, RNA-seq for DEGs, Western blot for AMPK/mitophagy markers, pharmacological rescue, and electron microscopy\",\n      \"pmids\": [\"40753852\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"TMSB4X identified only as a downstream DEG with inferred interaction\", \"Direct mechanistic role of TMSB4X not experimentally validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TMSB4X's core actin-binding activity mechanistically connects its diverse context-specific roles in signaling, immunity, and tumor biology remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model linking actin sequestration to HIF-1α, dendritic, or immune functions\", \"Direct partners and recruitment mechanisms in most contexts uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"TAGLN2\", \"CRYBB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}