{"gene":"TBX21","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2001,"finding":"T-bet induction by IFN-γ is dependent on STAT1 but not STAT4, establishing that IFN-γ drives T-bet expression through a STAT1-mediated autocrine loop that promotes further IFN-γ production.","method":"In vivo cytokine challenge with Toxoplasma gondii extract in IFN-γ-deficient and STAT1/STAT4-deficient mice; T-bet mRNA measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in multiple mouse strains with defined molecular readout, single lab","pmids":["11752460"],"is_preprint":false},{"year":2005,"finding":"T-bet represses Th2 lineage commitment through a tyrosine kinase-mediated physical interaction with GATA-3 that interferes with GATA-3 binding to its target DNA.","method":"Co-immunoprecipitation of T-bet and GATA-3; GATA-3 DNA-binding assays; T-bet tyrosine phosphorylation mutant analysis","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct protein–protein interaction demonstrated by Co-IP, DNA binding interference assay, and phosphorylation-site mutagenesis in single rigorous study","pmids":["15662016"],"is_preprint":false},{"year":2010,"finding":"T-bet suppresses Th17 differentiation by physically interacting with Runx1 via T-bet Tyr304, blocking Runx1-mediated transactivation of Rorc (encoding RORγt).","method":"Co-immunoprecipitation of T-bet and Runx1; Rorc promoter transactivation assays; T-bet Y304 mutagenesis; T-bet-deficient mouse Th17 differentiation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — reciprocal Co-IP, site-directed mutagenesis of the critical tyrosine, promoter assays, and in vivo genetic evidence in a single rigorous study","pmids":["21151104"],"is_preprint":false},{"year":2005,"finding":"T-bet and eomesodermin cooperatively induce CD122 (IL-15Rβ) expression, linking memory CD8+ T cell long-term renewal to cytotoxic effector programming; compound T-bet/Eomes deficiency abolishes IL-15-dependent lymphocyte lineages including memory CD8+ T cells and mature NK cells.","method":"Compound T-bet/Eomes double-mutant mice; flow cytometric enumeration of lymphocyte populations; CD122 expression analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic loss-of-function with multiple defined cellular phenotypes, replicated across multiple lymphocyte lineages","pmids":["16273099"],"is_preprint":false},{"year":2004,"finding":"T-bet is required in a stem cell-intrinsic manner for terminal maturation of NK cells and Vα14i NKT cells; T-bet expression in NK cells is regulated by NK-activating receptors and cytokines controlling NK development.","method":"T-bet-deficient mouse analysis; bone marrow chimera experiments establishing stem cell-intrinsic defect; flow cytometric characterization of NK/NKT maturation stages","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with chimera experiments establishing cell-intrinsic mechanism, multiple lymphocyte lineages examined","pmids":["15084276"],"is_preprint":false},{"year":2002,"finding":"T-bet directly regulates IgG class switching in B cells, particularly to IgG2a; T-bet-deficient B cells cannot generate germline or post-switch IgG2a transcripts in response to IFN-γ, and enforced T-bet expression initiates IgG2a switching in cell lines and primary cells.","method":"T-bet-deficient mouse B cell analysis; germline transcript RT-PCR; enforced T-bet expression in cell lines and primary B cells; isotype analysis by ELISA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function and gain-of-function experiments in both primary cells and cell lines, mechanistic transcriptional readout","pmids":["11960012"],"is_preprint":false},{"year":2003,"finding":"T-bet is selectively required for IgG2a class-switch recombination in response to T-independent (LPS) stimuli but not T-dependent (CD40) stimuli in B cells.","method":"T-bet-deficient B cell stimulation with LPS (T-independent) vs. CD40 ligation (T-dependent); germline IgG2a transcript analysis; isotype switching assays","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic loss-of-function with mechanistic pathway distinction, single lab","pmids":["12882831"],"is_preprint":false},{"year":2005,"finding":"T-bet controls Th1 cell migration to inflammatory sites by regulating PSGL-1-mediated binding to P-selectin on inflamed endothelium and by driving expression of the chemokine receptor CXCR3.","method":"T-bet-deficient mouse in vivo T cell trafficking assays; P-selectin binding assays; CXCR3 expression analysis by flow cytometry","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo trafficking experiments combined with direct binding assays and receptor expression analysis, multiple orthogonal methods","pmids":["16014561"],"is_preprint":false},{"year":2005,"finding":"T-bet-dependent expression of osteopontin (Opn) in activated T cells is essential for efficient skewing of CD4+ and CD8+ T cells toward Th1 and Tc1 programs; this regulation is T cell-specific and does not occur in macrophages.","method":"T-bet-deficient mouse T cell and macrophage analysis; Opn promoter studies; cytokine polarization assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with cell-type-specific mechanistic distinction, single lab","pmids":["16286640"],"is_preprint":false},{"year":2005,"finding":"T-bet represses IL-21 transcription in Th1 cells by inhibiting the binding of NFATc2 to the IL-21 proximal promoter, which in Th2 cells activates IL-21 transcription.","method":"IL-21 promoter activity assays; NFATc2 DNA-binding assays in presence/absence of T-bet; T helper subset-specific expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — promoter assays and DNA-binding interference demonstrated, single lab","pmids":["15684054"],"is_preprint":false},{"year":2007,"finding":"IFN-γ, CD122, and CXCR3 are direct gene targets of T-bet whose expression is acutely and directly regulated by T-bet activity, demonstrated by temporally controlled inducible T-bet system.","method":"Inducible T-bet-estrogen receptor fusion protein system with 4-hydroxytamoxifen; temporal on/off control of T-bet activity with gene expression readouts","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — inducible gain/loss-of-function system directly demonstrating acute T-bet-dependent gene regulation with temporal dissection","pmids":["17339440"],"is_preprint":false},{"year":2009,"finding":"Ikaros directly represses the tbx21 (T-bet) promoter in Th2 cells by binding to it; loss of Ikaros DNA-binding activity during Th2 polarization results in increased T-bet expression and IFN-γ production.","method":"ChIP of Ikaros at endogenous tbx21 promoter in Th1 vs Th2 cells; Ikaros dominant-negative overexpression; in vivo parasite infection model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct promoter occupancy, loss-of-function with functional readout, single lab","pmids":["19923223"],"is_preprint":false},{"year":2009,"finding":"EGR1 binds to the human T-BET promoter and induces T-bet transcription; EGR1 overexpression transactivates T-bet and synergizes with TCR signaling to induce T-bet expression, while EGR1 depletion decreases T-bet induction.","method":"Promoter reporter assays; EMSA demonstrating EGR1 binding to T-BET promoter; EGR1 overexpression and knockdown with T-bet expression readouts","journal":"Clinical immunology (Orlando, Fla.)","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — EMSA for direct binding, promoter assays, and gain/loss-of-function, single lab","pmids":["19307156"],"is_preprint":false},{"year":2007,"finding":"Sp1 binds to six conserved sites in the proximal human T-BET promoter and positively regulates T-BET transcription; Sp1 overexpression increases T-BET expression and IFN-γ secretion in NK and T cells, while mithramycin A (Sp1 inhibitor) reduces both.","method":"EMSA demonstrating Sp1 binding to T-BET promoter; Sp1 overexpression; mithramycin A treatment of primary NK cells; dose-response promoter activity assays","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — EMSA for direct binding, promoter activity assays, gain-of-function and pharmacological inhibition with functional readout, single lab","pmids":["17705132"],"is_preprint":false},{"year":2010,"finding":"T-bet promotes short-lived effector CD8+ T cell differentiation over central memory formation by directly inducing CD122 and IL-15Rα expression (switching survival cytokine dependence from IL-7 to IL-15), downregulating CD127 and SOCS-1, and promoting IFN-γ and Fas ligand expression; ectopic T-bet expression plus high IL-2 drives Blimp-1 expression for terminal differentiation.","method":"In vitro ectopic T-bet expression in OT-I CD8+ T cells without inflammatory cytokines; gene expression analysis; IL-2 dose-response experiments","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ectopic expression system isolating T-bet-specific effects from cytokine effects, multiple gene targets examined, single lab","pmids":["21182077"],"is_preprint":false},{"year":2010,"finding":"T-bet regulates Tim-3 expression in Th1 cells; Tim-3 is a direct transcriptional target of T-bet, establishing a feedback loop whereby T-bet drives effector Th1 differentiation while simultaneously inducing a counter-regulatory molecule to terminate Th1 responses.","method":"T-bet-deficient mouse analysis; Tim-3 promoter studies; analysis of Th1-specific transcription factor requirements for Tim-3 expression","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with promoter analysis, single lab","pmids":["20049876"],"is_preprint":false},{"year":2010,"finding":"T-bet recruits epigenetic modifying complexes to target genes, specifically a Jmjd3 H3K27-demethylase and a Set7/9 H3K4-methyltransferase complex, enabling reversal of repressive and establishment of active epigenetic states at Th1 target loci.","method":"Co-immunoprecipitation of T-bet with Jmjd3 and Set7/9 complexes; histone modification analysis at T-bet target genes; chromatin studies","journal":"Immunological reviews","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of T-bet with histone-modifying complexes cited as established biochemical finding, review summarizing experimental data, single lab","pmids":["20969596"],"is_preprint":false},{"year":2012,"finding":"T-bet and GATA3 bind to multiple distal regulatory elements (enhancers) at immune regulatory genes in human effector T cells; T-bet directly activates its own expression by binding distal sites at the Tbx21 locus; T-bet is sufficient to induce GATA3 binding at T-bet target sites in Th1 cells.","method":"ChIP-seq for T-bet and GATA3 genome-wide; enhancer reporter assays; histone modification mapping; T-bet sufficiency experiments for GATA3 redistribution","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq with reporter validation and functional manipulation, multiple orthogonal methods in one study","pmids":["23232398"],"is_preprint":false},{"year":2013,"finding":"T-bet subcellular localization in human CD8+ T cells is regulated by T-bet protein levels: T-bethi cells show predominantly nuclear T-bet, while T-betlo cells show predominantly cytoplasmic T-bet; TCR stimulation rapidly redistributes T-bet (but not Eomes) to the nucleus across all memory populations within 24 hours.","method":"Multiparameter flow cytometry with nuclear/cytoplasmic fractionation; TCR stimulation timecourse; analysis across human CD8 T cell memory subsets","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct subcellular localization by fractionation/flow cytometry, replicated across multiple human T cell subsets, single lab","pmids":["23455505"],"is_preprint":false},{"year":2014,"finding":"In intestinal intraepithelial lymphocytes (IELs), T-bet cooperates with Runx3 to suppress conventional CD4+ Th functions and induce IEL-specific programming including CD8αα homodimer expression; IFN-γ sensing and T-bet expression are both required for this IEL maturation program.","method":"Gene loss- and gain-of-function in T cells; reporter mouse strains; analysis of IEL marker expression and CD4 Th function suppression","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with reporter approaches and functional readouts, single lab","pmids":["25148025"],"is_preprint":false},{"year":2014,"finding":"USP10 interacts with T-bet in the nucleus, directly inhibits T-bet ubiquitination, and stabilizes T-bet protein; Quercetin (a T-bet inhibitor) targets USP10 to promote T-bet proteasomal degradation.","method":"Co-immunoprecipitation of USP10 and T-bet; ubiquitination assays; USP10 overexpression with T-bet stability readout; proteasome inhibitor experiments; Quercetin treatment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and direct ubiquitination assay demonstrating deubiquitinase-substrate relationship, single lab","pmids":["24845384"],"is_preprint":false},{"year":2015,"finding":"ST2 (IL-33 receptor) expression on Th1 effector cells depends on T-bet and STAT4; T-bet-dependent ST2 expression allows IL-33 to act as a direct cofactor driving antiviral Th1 effector cell activation, expansion, and cytokine production.","method":"T-bet-deficient mouse analysis; mixed bone marrow chimeras; adoptive cell transfer; in vitro Th1 differentiation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with chimera and transfer experiments establishing T cell-intrinsic mechanism, single lab","pmids":["25829541"],"is_preprint":false},{"year":2016,"finding":"T-bet activates Th1 genes through enhancers by recruiting Mediator and P-TEFb (as part of the Super Elongation Complex), enabling transcriptional elongation of RNA polymerase II already stalled at Th1 gene promoters in Th2 cells; T-bet also activates enhancer RNA transcription via P-TEFb.","method":"ChIP for T-bet, Mediator, P-TEFb at Th1 gene loci; P-TEFb pharmacological inhibition; Mediator and SEC knockdown; Pol II occupancy analysis; P-TEFb inhibition in experimental autoimmune uveitis model","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal ChIP analyses, genetic knockdowns, pharmacological inhibition with gene expression and in vivo functional readouts in single rigorous study","pmids":["27292648"],"is_preprint":false},{"year":2017,"finding":"mTORC1 signaling controls T-bet phosphorylation at multiple sites in CD4+ T cells; mTORC1-dependent phosphorylation of T-bet is required for efficient recruitment of chromatin remodeling complexes to the Ifng gene promoter and IFN-γ expression.","method":"Targeted mass spectrometry (MRM-MS) identification of T-bet phosphorylation sites; Rheb-deficient CD4+ T cells; rapamycin treatment; alanine mutagenesis of phosphorylation sites; ChIP for chromatin remodeling complex recruitment","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS-based phosphosite identification, genetic and pharmacological mTORC1 inhibition, mutagenesis of sites, and ChIP as mechanistic readout in single study","pmids":["28424242"],"is_preprint":false},{"year":2017,"finding":"NEDD4L mediates ubiquitination and proteasomal degradation of T-bet in CD4+ T cells; the PKA/phospho-Sp1/NEDD4L pathway downstream of the prostaglandin D2/DP1 axis controls T-bet stability and Th1 cytokine production.","method":"T-bet ubiquitination assays; NEDD4L overexpression and deletion; T-bet conditional knockout in CD4+ T cells; Western blot for T-bet protein levels; hypertension model","journal":"Circulation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ubiquitination assay with identified E3 ligase and upstream pathway, genetic validation in vivo, single lab","pmids":["31893939"],"is_preprint":false},{"year":2017,"finding":"Egr2 and Egr3 physically interact with the T-box domain of T-bet and block T-bet DNA binding, thereby inhibiting T-bet-mediated IFN-γ production in CD4+ and CD8+ effector T cells.","method":"Co-immunoprecipitation of Egr2/3 with T-bet; T-bet DNA-binding assays in presence of Egr2/3; Egr2/3-deficient T cells; Th1/Th17 differentiation assays; viral infection model","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP demonstrating direct physical interaction at T-box domain, DNA-binding interference assay, and genetic loss-of-function with functional readout","pmids":["28455436"],"is_preprint":false},{"year":2017,"finding":"T-bet+ Treg cells have an essential immunosuppressive function; loss of T-bet-expressing Treg cells (but not T-bet expression within Treg cells) causes severe Th1 autoimmunity; T-bet+ Treg cells specifically co-localize with and inhibit T-bet+ effector T cells and CD8 T cell activation.","method":"Conditional ablation of T-bet-expressing Treg cells vs. selective T-bet deletion within Treg cells; adoptive transfer; lineage tracing; infection models in mice","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — elegant conditional genetics distinguishing T-bet expression vs. T-bet+ cell presence, multiple orthogonal approaches, disease model validation","pmids":["28607488"],"is_preprint":false},{"year":2021,"finding":"EOMES and T-BET regulate largely distinct gene sets during NK cell development: EOMES is dominant in immature NK cells and drives early lineage specification, while T-BET is dominant in mature NK cells where it induces IL-12 responsiveness and represses the cell cycle; both TFs show strong overlap in DNA binding targets with extensive epigenetic changes during differentiation.","method":"Gene-modified mice with endogenous ChIP tags for EOMES and T-BET; ChIP-seq; RNA-seq; ATAC-seq; conditional knockout models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — endogenous ChIP-seq with multiple orthogonal genomics approaches and conditional genetics, rigorous study","pmids":["34521844"],"is_preprint":false},{"year":2021,"finding":"Human T-bet governs the differentiation of CD11chiCD21lo B cells by controlling chromatin accessibility at lineage-defining genes including FAS, IL21R, SEC61B, DUSP4, DAPP1, SOX5, CD79B, and CXCR4; inherited T-bet deficiency abrogates this B cell subset in vivo and in vitro.","method":"Patient with inherited T-bet deficiency; in vitro B cell differentiation assays; ATAC-seq for chromatin accessibility; flow cytometry; in vivo B cell subset analysis","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — human genetic loss-of-function combined with ATAC-seq mechanistic chromatin analysis, both in vivo and in vitro validation","pmids":["35867801"],"is_preprint":false},{"year":2021,"finding":"T-BET and EOMES in primary human NK cells are required for normal NK cell proliferation, persistence in vivo, cytokine responses, and antitumor function; deletion of these TFs causes CD56bright NK cells to acquire an ILC precursor-like profile with increased RORC and AHR, revealing T-box TF roles in suppressing alternative ILC lineages.","method":"CRISPR/Cas9 deletion of T-BET and EOMES in primary human NK cells; in vivo antitumor xenograft model; single-cell RNA-seq; cytokine stimulation assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — CRISPR loss-of-function in primary human cells with in vivo functional readout and scRNA-seq mechanistic characterization","pmids":["37279078"],"is_preprint":false},{"year":2021,"finding":"T-BET and EOMES ectopically expressed in human hematopoietic progenitors epigenetically repress HSC quiescence and non-NK lineage genes while activating NK-specific transcriptome; T-BET specifically controls terminal maturation markers and KIR expression epigenetically, while EOMES shows superior early NK maturation and CD16 induction.","method":"Ectopic T-BET or EOMES expression in human hematopoietic progenitor cells; transcriptome, ATAC-seq, and protein expression analyses; NK cell functional assays","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — gain-of-function with multi-omic mechanistic analysis (transcriptome + chromatin accessibility + protein) and functional validation","pmids":["34630413"],"is_preprint":false},{"year":2018,"finding":"Transient T-bet expression epigenetically imprints the Ifng locus in Tfh cells, partially opening chromatin accessibility at the locus and enabling IFN-γ production in an 'ex-T-bet' Tfh subset; IFN-γ-expressing Tfh cells are absent in T-bet-deficient mice but present when T-bet is deleted only at late T cell differentiation stages.","method":"T-bet fate-mapping mouse strains; DNase I hypersensitivity analysis of Ifng locus; multicolor tissue imaging; T-bet conditional late-deletion mice","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — fate-mapping with epigenetic analysis and conditional deletion, multiple orthogonal approaches demonstrating epigenetic imprinting mechanism","pmids":["30232200"],"is_preprint":false},{"year":2021,"finding":"T-bet deletion during embryogenesis rescues lymph node formation in RORγt-deficient mice by skewing fetal ILC differentiation fate; mechanistically, T-bet deletion promotes accumulation of PLZFhi ILC progenitors expressing LTi molecules in a RORα-dependent fashion.","method":"Multiple conditional mouse models; single-cell analysis of fetal ILCs and ILC progenitors; T-bet/RORγt double-deficient mice; RORα genetic interaction experiments","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic mouse models with epistasis analysis and single-cell characterization revealing unexpected developmental role","pmids":["34556887"],"is_preprint":false},{"year":2007,"finding":"T-bet directly regulates transcription of the IL-23R in CD4+ T cells, thereby influencing the fate of Th17 cells which depend on IL-23 signaling for survival.","method":"T-bet siRNA knockdown in EAE model; IL-23R expression analysis in T-bet-deficient cells; therapeutic siRNA administration with clinical and cellular readouts","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcriptional regulation of IL-23R by T-bet demonstrated by knockdown with receptor expression readout, single lab","pmids":["17237380"],"is_preprint":false},{"year":2022,"finding":"T-bet in B cells drives IgG2c class switching and promotes IFN-γ and inflammatory macrophage accumulation in adipose tissue; T-bet-derived IgG from adipose B cells is a key mediator of metabolic inflammation in obesity, as confirmed by serum/IgG transfer experiments.","method":"B cell-specific Tbx21 knockout mice; B cell transfer experiments; serum and purified IgG transfer from HFD mice to T-bet+ B cell-deficient mice; cytokine and metabolic measurements","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific genetic deletion plus reconstitution/transfer experiments establishing causality, multiple orthogonal approaches","pmids":["35868310"],"is_preprint":false},{"year":2022,"finding":"T-bet expression in Th17 cells (via Tbx21-flox x Il17aCre) is required for Th17-to-Th1 transdifferentiation plasticity; blocking this transdifferentiation increases S. aureus tissue loads in a sepsis model.","method":"Conditional T-bet knockout in Th17 fate cells (Il17aCre x Tbx21-flox); Il17aCre x R26YFP fate-mapping; single-cell RNA-seq of renal Th17 fate cells; S. aureus sepsis model","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic deletion with fate-mapping and scRNA-seq plus in vivo functional readout, multiple orthogonal methods","pmids":["35446923"],"is_preprint":false},{"year":2020,"finding":"c-Maf directly restrains T-bet expression in CCR6− ILC3s; conversely, c-Maf expression is dependent on T-bet, forming a negative feedback loop that preserves ILC3 identity by limiting T-bet-driven type 1 differentiation.","method":"c-Maf-deficient mouse phenotypic and transcriptomic profiling; direct c-Maf occupancy at T-bet locus; cytokine regulation of c-Maf and T-bet","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with transcriptomic analysis and direct occupancy data, single lab","pmids":["32039762"],"is_preprint":false}],"current_model":"TBX21/T-bet is a T-box transcription factor that drives type 1 immune responses by directly activating target genes (IFN-γ, CXCR3, CD122, Tim-3, IL-23R, Opn) through enhancer binding and P-TEFb/Mediator-dependent transcriptional elongation, recruiting epigenetic remodeling complexes (Jmjd3, Set7/9) to establish active chromatin states, while simultaneously repressing alternative lineage programs (Th2, Th17) via physical interactions with GATA-3 (blocking its DNA binding in a tyrosine kinase-dependent manner) and Runx1 (blocking Rorc transactivation via Tyr304-dependent complex formation); T-bet protein stability is regulated by ubiquitination (degraded via NEDD4L, stabilized by deubiquitinase USP10) and by mTORC1-dependent phosphorylation at multiple sites required for chromatin remodeling complex recruitment, while T-bet transcription is induced upstream by IFN-γ/STAT1 signaling and directly by EGR1 and Sp1, and antagonized by Ikaros and Egr2/3 (which block T-bet DNA binding at its T-box domain)."},"narrative":{"mechanistic_narrative":"TBX21 (T-bet) is a T-box transcription factor that serves as the master driver of type 1 immune programming across CD4+ Th1, CD8+ Tc1, NK, NKT, B, and innate lymphoid cell lineages [PMID:17339440, PMID:23232398, PMID:15084276]. It functions by binding distal enhancers and promoters at type 1 immune genes — directly activating IFN-γ, CD122/IL-15Rβ, CXCR3, Tim-3, IL-23R, and osteopontin, and even autoactivating its own locus [PMID:17339440, PMID:23232398, PMID:20049876, PMID:17237380, PMID:16286640]. Transcriptional activation proceeds through recruitment of Mediator and P-TEFb (the Super Elongation Complex) to license elongation of RNA Pol II stalled at Th1 promoters, and through recruitment of Jmjd3 (H3K27 demethylase) and Set7/9 (H3K4 methyltransferase) complexes that establish active chromatin and epigenetically imprint loci such as Ifng [PMID:27292648, PMID:20969596, PMID:30232200]. In parallel, T-bet enforces lineage fidelity by repressing alternative programs: it physically engages GATA-3 in a tyrosine-kinase-dependent manner to block its DNA binding (Th2), interacts with Runx1 via Tyr304 to prevent Rorc transactivation (Th17), and inhibits NFATc2 binding at the IL-21 promoter [PMID:15662016, PMID:21151104, PMID:15684054]. T-bet activity is set by both transcriptional inputs — induced by IFN-γ/STAT1 signaling and by EGR1 and Sp1, and repressed by Ikaros, c-Maf, and Egr2/3 (which bind the T-box domain to block DNA binding) — and by protein-level control through ubiquitination (NEDD4L-mediated degradation, USP10-mediated stabilization), mTORC1-dependent phosphorylation required for chromatin remodeler recruitment, and nuclear/cytoplasmic partitioning [PMID:11752460, PMID:19307156, PMID:17705132, PMID:19923223, PMID:32039762, PMID:28455436, PMID:31893939, PMID:24845384, PMID:28424242, PMID:23455505]. Beyond T cells, T-bet cooperates with Eomes to govern NK and memory CD8 cell maturation and with Runx3 to program intestinal IELs, and drives B cell IgG2a/IgG2c class switching; inherited human T-bet deficiency abrogates the CD11chiCD21lo B cell subset [PMID:16273099, PMID:34521844, PMID:25148025, PMID:11960012, PMID:35867801].","teleology":[{"year":2001,"claim":"Established the upstream signal that induces T-bet, defining a STAT1-dependent IFN-γ autocrine loop rather than the STAT4/IL-12 axis as the trigger for T-bet expression.","evidence":"Cytokine challenge in IFN-γ-, STAT1-, and STAT4-deficient mice with T-bet mRNA readout","pmids":["11752460"],"confidence":"Medium","gaps":["Did not map the cis-elements at the Tbx21 locus mediating STAT1 responsiveness","Single lab, in vivo readout only"]},{"year":2002,"claim":"Extended T-bet function beyond T cells, showing it directly controls IgG2a class switching in B cells downstream of IFN-γ.","evidence":"Loss- and gain-of-function in B cells with germline transcript and isotype readouts","pmids":["11960012","12882831"],"confidence":"High","gaps":["Direct promoter/enhancer targets at the Igh locus not mapped","Stimulus dependence (T-independent vs T-dependent) mechanistically unresolved"]},{"year":2004,"claim":"Demonstrated a cell-intrinsic requirement for T-bet in terminal NK and NKT maturation, broadening its role to innate lymphocytes.","evidence":"T-bet-deficient mice and bone marrow chimeras with flow cytometric maturation staging","pmids":["15084276"],"confidence":"High","gaps":["Direct transcriptional targets driving NK maturation not defined here","Relationship to Eomes not addressed"]},{"year":2005,"claim":"Defined the molecular basis of lineage repression, showing T-bet blocks Th2 commitment by a tyrosine-kinase-dependent physical interaction with GATA-3 that prevents GATA-3 DNA binding.","evidence":"Co-IP, GATA-3 DNA-binding assays, and phospho-mutant analysis","pmids":["15662016"],"confidence":"High","gaps":["The responsible tyrosine kinase not identified","Stoichiometry and genomic locations of the interaction unresolved"]},{"year":2005,"claim":"Identified T-bet's role in coupling effector function to migration and survival, regulating CXCR3/PSGL-1-mediated trafficking, osteopontin-driven polarization, IL-21 repression, and (with Eomes) CD122/IL-15 responsiveness.","evidence":"T-bet-deficient mice, trafficking and binding assays, promoter studies, and T-bet/Eomes compound mutants","pmids":["16014561","16286640","15684054","16273099"],"confidence":"High","gaps":["Direct vs indirect target status not resolved for all genes in these studies","Division of labor between T-bet and Eomes at shared targets unmapped"]},{"year":2007,"claim":"Distinguished direct from indirect T-bet targets using temporal control, confirming IFN-γ, CD122, CXCR3, and IL-23R as acutely T-bet-regulated genes.","evidence":"Inducible T-bet-ER fusion with 4-OHT and gene expression timecourse; siRNA knockdown in EAE for IL-23R","pmids":["17339440","17237380"],"confidence":"High","gaps":["Did not resolve enhancer vs promoter binding genome-wide","Cofactor requirements for acute activation not addressed"]},{"year":2007,"claim":"Identified the transcriptional activators of T-bet itself, showing EGR1 and Sp1 bind the human T-BET promoter to induce its expression.","evidence":"EMSA, promoter reporter assays, gain/loss-of-function, and Sp1 pharmacological inhibition","pmids":["17705132","19307156"],"confidence":"Medium","gaps":["Integration with STAT1/TCR signaling at the promoter not fully resolved","Single lab per factor"]},{"year":2009,"claim":"Identified Ikaros as a direct repressor of the Tbx21 promoter in Th2 cells, establishing transcriptional gating of T-bet during lineage choice.","evidence":"ChIP at the endogenous tbx21 promoter, Ikaros dominant-negative, and in vivo infection","pmids":["19923223"],"confidence":"Medium","gaps":["Mechanism of Ikaros recruitment and corepressor partners unknown","Single lab"]},{"year":2010,"claim":"Defined the chromatin-modifying machinery T-bet uses, showing recruitment of Jmjd3 (H3K27 demethylase) and Set7/9 (H3K4 methyltransferase) complexes, and refined repression mechanism via Runx1/Tyr304 and counter-regulation via Tim-3.","evidence":"Co-IP of T-bet with histone modifiers, histone modification mapping, Runx1 Co-IP/Y304 mutagenesis, and Tim-3 promoter analysis","pmids":["20969596","21151104","20049876","21182077"],"confidence":"High","gaps":["Stoichiometry and genome-wide distribution of T-bet/Jmjd3/Set7-9 complexes not mapped","How phosphorylation gates these interactions not yet linked"]},{"year":2012,"claim":"Provided the genome-wide enhancer logic, showing T-bet and GATA3 co-occupy distal regulatory elements, T-bet autoactivates its locus, and T-bet redirects GATA3 binding.","evidence":"ChIP-seq for T-bet and GATA3, enhancer reporter assays, and sufficiency experiments","pmids":["23232398"],"confidence":"High","gaps":["Functional consequence of every co-bound enhancer not validated","Mechanism of GATA3 redistribution unresolved"]},{"year":2016,"claim":"Resolved the activation mechanism at the level of Pol II, showing T-bet recruits Mediator and P-TEFb/SEC to release stalled polymerase and drive elongation and enhancer RNA transcription.","evidence":"ChIP for T-bet/Mediator/P-TEFb, knockdowns, P-TEFb pharmacological inhibition, and an EAU model","pmids":["27292648"],"confidence":"High","gaps":["Direct contact surface between T-bet and SEC components not defined","How elongation control integrates with chromatin remodeling unresolved"]},{"year":2017,"claim":"Established post-translational control of T-bet, identifying NEDD4L-mediated degradation, USP10-mediated stabilization, mTORC1-dependent phosphorylation required for remodeler recruitment, and Egr2/3 as T-box-domain DNA-binding blockers.","evidence":"Ubiquitination assays, Co-IP, MRM-MS phosphosite mapping, phospho/site mutagenesis, and genetic loss-of-function with ChIP and functional readouts","pmids":["31893939","24845384","28424242","28455436"],"confidence":"High","gaps":["Specific phosphosites linked to specific remodeler interactions not fully mapped","Crosstalk between ubiquitination, phosphorylation, and localization not integrated"]},{"year":2017,"claim":"Distinguished the role of T-bet expression from the presence of T-bet+ cells, showing T-bet+ Treg cells are an essential suppressive population restraining type 1 autoimmunity.","evidence":"Conditional ablation of T-bet+ Treg cells vs selective T-bet deletion, adoptive transfer, and lineage tracing","pmids":["28607488"],"confidence":"High","gaps":["Transcriptional targets enabling Treg suppressive function not defined","Mechanism of co-localization with effector cells unresolved"]},{"year":2018,"claim":"Demonstrated epigenetic memory, showing transient T-bet expression imprints the Ifng locus to license later IFN-γ production in 'ex-T-bet' Tfh cells.","evidence":"T-bet fate-mapping, DNase I hypersensitivity at Ifng, and late conditional deletion","pmids":["30232200"],"confidence":"High","gaps":["Molecular basis of heritable chromatin mark not identified","Reversibility and durability of imprinting unresolved"]},{"year":2021,"claim":"Dissected the T-bet/Eomes division of labor in NK biology and lineage fidelity, showing largely distinct yet overlapping programs, suppression of alternative ILC fates, and developmental control of ILC differentiation.","evidence":"Endogenous-tag ChIP-seq/RNA-seq/ATAC-seq, CRISPR deletion in primary human NK cells, ectopic expression in progenitors, and conditional/epistasis mouse models","pmids":["34521844","37279078","34630413","34556887","32039762"],"confidence":"High","gaps":["Direct mechanistic basis for repressing RORC/AHR ILC programs not fully defined","Quantitative rules for T-bet vs Eomes target selection unresolved"]},{"year":2022,"claim":"Defined human disease relevance and tissue-specific roles, showing inherited T-bet deficiency abrogates CD11chiCD21lo B cells, and T-bet drives Th17-to-Th1 plasticity and adipose B cell IgG-mediated metabolic inflammation.","evidence":"Patient with inherited T-bet deficiency with ATAC-seq, conditional B/Th17 knockouts, fate-mapping, scRNA-seq, and IgG transfer experiments","pmids":["35867801","35446923","35868310","25148025"],"confidence":"High","gaps":["Full spectrum of human T-bet-deficiency phenotypes not enumerated","Direct targets driving each tissue-specific program incompletely mapped"]},{"year":null,"claim":"How T-bet's distinct post-translational modifications (phosphorylation, ubiquitination), localization control, and chromatin-modifier recruitment are mechanistically integrated to select context-specific target genes remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of T-bet bound to its remodeler or SEC partners","Rules governing T-bet vs Eomes target partitioning incompletely defined","Direct contact surfaces for repressive interactions (GATA-3, Runx1, Egr2/3) not structurally resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[10,17,22,5,15,33]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[17,25,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,9,25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,20,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[18]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,17,4,26,28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,17,22]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[16,31,28,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,27,32,30]}],"complexes":[],"partners":["GATA3","RUNX1","EOMES","USP10","NEDD4L","EGR2","JMJD3","SET7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UL17","full_name":"T-box transcription factor TBX21","aliases":["T-cell-specific T-box transcription factor T-bet","Transcription factor TBLYM"],"length_aa":535,"mass_kda":58.3,"function":"Lineage-defining transcription factor which initiates Th1 lineage development from naive Th precursor cells both by activating Th1 genetic programs and by repressing the opposing Th2 and Th17 genetic programs (PubMed:10761931). Activates transcription of a set of genes important for Th1 cell function, including those encoding IFN-gamma and the chemokine receptor CXCR3. Induces permissive chromatin accessibilty and CpG methylation in IFNG (PubMed:33296702). Activates IFNG and CXCR3 genes in part by recruiting chromatin remodeling complexes including KDM6B, a SMARCA4-containing SWI/SNF-complex, and an H3K4me2-methyltransferase complex to their promoters and all of these complexes serve to establish a more permissive chromatin state conducive with transcriptional activation (By similarity). Can activate Th1 genes also via recruitment of Mediator complex and P-TEFb (composed of CDK9 and CCNT1/cyclin-T1) in the form of the super elongation complex (SEC) to super-enhancers and associated genes in activated Th1 cells (PubMed:27292648). Inhibits the Th17 cell lineage commitment by blocking RUNX1-mediated transactivation of Th17 cell-specific transcriptinal regulator RORC. Inhibits the Th2 cell lineage commitment by suppressing the production of Th2 cytokines, such as IL-4, IL-5, and IL- 13, via repression of transcriptional regulators GATA3 and NFATC2. Protects Th1 cells from amplifying aberrant type-I IFN response in an IFN-gamma abundant microenvironment by acting as a repressor of type-I IFN transcription factors and type-I IFN-stimulated genes. Acts as a regulator of antiviral B-cell responses; controls chronic viral infection by promoting the antiviral antibody IgG2a isotype switching and via regulation of a broad antiviral gene expression program (By similarity). Required for the correct development of natural killer (NK) and mucosal-associated invariant T (MAIT) cells (PubMed:33296702)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UL17/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TBX21","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":[],"url":"https://opencell.sf.czbiohub.org/search/TBX21","total_profiled":1310},"omim":[{"mim_id":"619630","title":"IMMUNODEFICIENCY 88; IMD88","url":"https://www.omim.org/entry/619630"},{"mim_id":"612116","title":"UBIQUITIN-SPECIFIC PROTEASE 22; USP22","url":"https://www.omim.org/entry/612116"},{"mim_id":"610783","title":"MICRO RNA 29B1; MIR29B1","url":"https://www.omim.org/entry/610783"},{"mim_id":"610782","title":"MICRO RNA 29A; MIR29A","url":"https://www.omim.org/entry/610782"},{"mim_id":"609022","title":"RAPAMYCIN-INSENSITIVE COMPANION OF MTOR; RICTOR","url":"https://www.omim.org/entry/609022"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":10.5},{"tissue":"lung","ntpm":3.1},{"tissue":"lymphoid tissue","ntpm":11.0}],"url":"https://www.proteinatlas.org/search/TBX21"},"hgnc":{"alias_symbol":["TBLYM","T-bet"],"prev_symbol":[]},"alphafold":{"accession":"Q9UL17","domains":[{"cath_id":"2.60.40.820","chopping":"130-319","consensus_level":"high","plddt":91.5748,"start":130,"end":319}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UL17","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UL17-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UL17-F1-predicted_aligned_error_v6.png","plddt_mean":60.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TBX21","jax_strain_url":"https://www.jax.org/strain/search?query=TBX21"},"sequence":{"accession":"Q9UL17","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UL17.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UL17/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UL17"}},"corpus_meta":[{"pmid":"16273099","id":"PMC_16273099","title":"Effector and memory CD8+ T cell fate coupled by T-bet and eomesodermin.","date":"2005","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/16273099","citation_count":1043,"is_preprint":false},{"pmid":"15084276","id":"PMC_15084276","title":"T-bet regulates the terminal maturation and homeostasis of NK and Valpha14i NKT cells.","date":"2004","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/15084276","citation_count":595,"is_preprint":false},{"pmid":"11752460","id":"PMC_11752460","title":"T-bet is rapidly induced by interferon-gamma in lymphoid and myeloid cells.","date":"2001","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11752460","citation_count":569,"is_preprint":false},{"pmid":"15662016","id":"PMC_15662016","title":"T helper cell fate specified by kinase-mediated interaction of T-bet with GATA-3.","date":"2005","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/15662016","citation_count":401,"is_preprint":false},{"pmid":"24113868","id":"PMC_24113868","title":"T-bet: a bridge between innate and adaptive immunity.","date":"2013","source":"Nature reviews. Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24113868","citation_count":399,"is_preprint":false},{"pmid":"11960012","id":"PMC_11960012","title":"T-bet regulates IgG class switching and pathogenic autoantibody production.","date":"2002","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/11960012","citation_count":389,"is_preprint":false},{"pmid":"28607488","id":"PMC_28607488","title":"Stability and function of regulatory T cells expressing the transcription factor T-bet.","date":"2017","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/28607488","citation_count":332,"is_preprint":false},{"pmid":"21151104","id":"PMC_21151104","title":"T-bet represses T(H)17 differentiation by preventing Runx1-mediated activation of the gene encoding RORγt.","date":"2010","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21151104","citation_count":314,"is_preprint":false},{"pmid":"15665085","id":"PMC_15665085","title":"T-bet deficiency reduces atherosclerosis and alters plaque antigen-specific immune responses.","date":"2005","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/15665085","citation_count":292,"is_preprint":false},{"pmid":"23232398","id":"PMC_23232398","title":"T-bet and GATA3 orchestrate Th1 and Th2 differentiation through lineage-specific targeting of distal regulatory elements.","date":"2012","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/23232398","citation_count":279,"is_preprint":false},{"pmid":"19546248","id":"PMC_19546248","title":"T-bet is essential for encephalitogenicity of both Th1 and Th17 cells.","date":"2009","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19546248","citation_count":226,"is_preprint":false},{"pmid":"17237380","id":"PMC_17237380","title":"T-bet regulates the fate of Th1 and Th17 lymphocytes in autoimmunity.","date":"2007","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/17237380","citation_count":210,"is_preprint":false},{"pmid":"16014561","id":"PMC_16014561","title":"T-bet is required for optimal proinflammatory CD4+ T-cell trafficking.","date":"2005","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/16014561","citation_count":207,"is_preprint":false},{"pmid":"21685955","id":"PMC_21685955","title":"T-bet in disease.","date":"2011","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21685955","citation_count":200,"is_preprint":false},{"pmid":"24860576","id":"PMC_24860576","title":"Characterization of T-bet and eomes in peripheral human immune cells.","date":"2014","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24860576","citation_count":167,"is_preprint":false},{"pmid":"25829541","id":"PMC_25829541","title":"T-bet- and STAT4-dependent IL-33 receptor expression directly promotes antiviral Th1 cell responses.","date":"2015","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25829541","citation_count":152,"is_preprint":false},{"pmid":"20713880","id":"PMC_20713880","title":"T-bet and eomesodermin are required for T cell-mediated antitumor immune responses.","date":"2010","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/20713880","citation_count":151,"is_preprint":false},{"pmid":"29424438","id":"PMC_29424438","title":"T-bet and Eomes govern differentiation and function of mouse and human NK cells and ILC1.","date":"2018","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/29424438","citation_count":143,"is_preprint":false},{"pmid":"28756897","id":"PMC_28756897","title":"Role of CD11c+ T-bet+ B cells in human health and disease.","date":"2017","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28756897","citation_count":142,"is_preprint":false},{"pmid":"16286640","id":"PMC_16286640","title":"T-bet-dependent expression of osteopontin contributes to T cell polarization.","date":"2005","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16286640","citation_count":129,"is_preprint":false},{"pmid":"34623902","id":"PMC_34623902","title":"The expansion of human T-bethighCD21low B cells is T cell dependent.","date":"2021","source":"Science immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34623902","citation_count":124,"is_preprint":false},{"pmid":"28279590","id":"PMC_28279590","title":"Transcription Factor T-bet Orchestrates Lineage Development and Function in the Immune System.","date":"2017","source":"Trends in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28279590","citation_count":124,"is_preprint":false},{"pmid":"27021296","id":"PMC_27021296","title":"CCR5+T-bet+FoxP3+ Effector CD4 T Cells Drive Atherosclerosis.","date":"2016","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/27021296","citation_count":123,"is_preprint":false},{"pmid":"16177105","id":"PMC_16177105","title":"Expression of T-bet by CD4 T cells is essential for resistance to Salmonella infection.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/16177105","citation_count":123,"is_preprint":false},{"pmid":"30874358","id":"PMC_30874358","title":"T-bet+ memory B cells: Generation, function, and fate.","date":"2019","source":"Immunological reviews","url":"https://pubmed.ncbi.nlm.nih.gov/30874358","citation_count":112,"is_preprint":false},{"pmid":"25148025","id":"PMC_25148025","title":"Transcription factor T-bet regulates intraepithelial lymphocyte functional maturation.","date":"2014","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/25148025","citation_count":112,"is_preprint":false},{"pmid":"29212666","id":"PMC_29212666","title":"STAT4 and T-bet control follicular helper T cell development in viral infections.","date":"2017","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29212666","citation_count":111,"is_preprint":false},{"pmid":"27379101","id":"PMC_27379101","title":"T-bet and Eomesodermin in NK Cell Development, Maturation, and Function.","date":"2016","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27379101","citation_count":110,"is_preprint":false},{"pmid":"23455505","id":"PMC_23455505","title":"Differential localization of T-bet and Eomes in CD8 T cell memory populations.","date":"2013","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/23455505","citation_count":109,"is_preprint":false},{"pmid":"12882831","id":"PMC_12882831","title":"T-bet regulates T-independent IgG2a class switching.","date":"2003","source":"International immunology","url":"https://pubmed.ncbi.nlm.nih.gov/12882831","citation_count":106,"is_preprint":false},{"pmid":"20049876","id":"PMC_20049876","title":"T-bet, a Th1 transcription factor regulates the expression of Tim-3.","date":"2010","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/20049876","citation_count":93,"is_preprint":false},{"pmid":"27872297","id":"PMC_27872297","title":"Singular role for T-BET+CXCR3+ regulatory T cells in protection from autoimmune diabetes.","date":"2016","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/27872297","citation_count":90,"is_preprint":false},{"pmid":"34521844","id":"PMC_34521844","title":"Sequential actions of EOMES and T-BET promote stepwise maturation of natural killer cells.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34521844","citation_count":83,"is_preprint":false},{"pmid":"31136008","id":"PMC_31136008","title":"Induction of brain-infiltrating T-bet-expressing B cells in multiple sclerosis.","date":"2019","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/31136008","citation_count":82,"is_preprint":false},{"pmid":"30232200","id":"PMC_30232200","title":"Transient T-bet expression functionally specifies a distinct T follicular helper subset.","date":"2018","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30232200","citation_count":76,"is_preprint":false},{"pmid":"16696895","id":"PMC_16696895","title":"The T-box transcription factor T-bet in immunity and autoimmunity.","date":"2006","source":"Cellular & molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/16696895","citation_count":72,"is_preprint":false},{"pmid":"35868310","id":"PMC_35868310","title":"T-bet+ B cells accumulate in adipose tissue and exacerbate metabolic disorder during obesity.","date":"2022","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/35868310","citation_count":71,"is_preprint":false},{"pmid":"35867801","id":"PMC_35867801","title":"Human T-bet governs the generation of a distinct subset of CD11chighCD21low B cells.","date":"2022","source":"Science immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35867801","citation_count":69,"is_preprint":false},{"pmid":"29101363","id":"PMC_29101363","title":"Plasmodium DNA-mediated TLR9 activation of T-bet+ B cells contributes to autoimmune anaemia during malaria.","date":"2017","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/29101363","citation_count":69,"is_preprint":false},{"pmid":"15684054","id":"PMC_15684054","title":"NFATc2 and T-bet contribute to T-helper-cell-subset-specific regulation of IL-21 expression.","date":"2005","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/15684054","citation_count":68,"is_preprint":false},{"pmid":"20969596","id":"PMC_20969596","title":"Molecular mechanisms by which T-bet regulates T-helper cell commitment.","date":"2010","source":"Immunological reviews","url":"https://pubmed.ncbi.nlm.nih.gov/20969596","citation_count":64,"is_preprint":false},{"pmid":"12128215","id":"PMC_12128215","title":"Developmental expression of the T-box transcription factor T-bet/Tbx21 during mouse embryogenesis.","date":"2002","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/12128215","citation_count":64,"is_preprint":false},{"pmid":"30846856","id":"PMC_30846856","title":"The evolving role of T-bet in resistance to infection.","date":"2019","source":"Nature reviews. Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30846856","citation_count":63,"is_preprint":false},{"pmid":"17339440","id":"PMC_17339440","title":"Temporal dissection of T-bet functions.","date":"2007","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/17339440","citation_count":60,"is_preprint":false},{"pmid":"27230441","id":"PMC_27230441","title":"Expanded lung T-bet+RORγT+ CD4+ T-cells in sarcoidosis patients with a favourable disease phenotype.","date":"2016","source":"The European respiratory journal","url":"https://pubmed.ncbi.nlm.nih.gov/27230441","citation_count":59,"is_preprint":false},{"pmid":"29564567","id":"PMC_29564567","title":"T-bet deficiency attenuates cardiac remodelling in rats.","date":"2018","source":"Basic research in cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/29564567","citation_count":57,"is_preprint":false},{"pmid":"28457482","id":"PMC_28457482","title":"Aging effects on T-bet expression in human B cell subsets.","date":"2017","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28457482","citation_count":57,"is_preprint":false},{"pmid":"27292648","id":"PMC_27292648","title":"T-bet Activates Th1 Genes through Mediator and the Super Elongation Complex.","date":"2016","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/27292648","citation_count":54,"is_preprint":false},{"pmid":"25541140","id":"PMC_25541140","title":"TLR7, IFNγ, and T-bet: their roles in the development of ABCs in female-biased autoimmunity.","date":"2014","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/25541140","citation_count":53,"is_preprint":false},{"pmid":"19923223","id":"PMC_19923223","title":"Ikaros silences T-bet expression and interferon-gamma production during T helper 2 differentiation.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19923223","citation_count":53,"is_preprint":false},{"pmid":"34675939","id":"PMC_34675939","title":"Expression Regulation and Function of T-Bet in NK Cells.","date":"2021","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34675939","citation_count":49,"is_preprint":false},{"pmid":"28739077","id":"PMC_28739077","title":"T-bet-expressing B cells during HIV and HCV infections.","date":"2017","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28739077","citation_count":49,"is_preprint":false},{"pmid":"37279078","id":"PMC_37279078","title":"T-BET and EOMES sustain mature human NK cell identity and antitumor function.","date":"2023","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/37279078","citation_count":49,"is_preprint":false},{"pmid":"19307156","id":"PMC_19307156","title":"T-bet expression is regulated by EGR1-mediated signaling in activated T cells.","date":"2009","source":"Clinical immunology (Orlando, Fla.)","url":"https://pubmed.ncbi.nlm.nih.gov/19307156","citation_count":47,"is_preprint":false},{"pmid":"21114556","id":"PMC_21114556","title":"FoxP3, GATA-3 and T-bet expression in elderly asthma.","date":"2010","source":"Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21114556","citation_count":46,"is_preprint":false},{"pmid":"24901011","id":"PMC_24901011","title":"The role of protein modifications of T-bet in cytokine production and differentiation of T helper cells.","date":"2014","source":"Journal of immunology research","url":"https://pubmed.ncbi.nlm.nih.gov/24901011","citation_count":46,"is_preprint":false},{"pmid":"28923237","id":"PMC_28923237","title":"Signals that drive T-bet expression in B cells.","date":"2017","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28923237","citation_count":45,"is_preprint":false},{"pmid":"19362357","id":"PMC_19362357","title":"TBX21 gene variants increase childhood asthma risk in combination with HLX1 variants.","date":"2009","source":"The Journal of allergy and clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/19362357","citation_count":45,"is_preprint":false},{"pmid":"22133865","id":"PMC_22133865","title":"T-bet employs diverse regulatory mechanisms to repress transcription.","date":"2011","source":"Trends in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22133865","citation_count":44,"is_preprint":false},{"pmid":"34630413","id":"PMC_34630413","title":"T-BET and EOMES Accelerate and Enhance Functional Differentiation of Human Natural Killer Cells.","date":"2021","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34630413","citation_count":43,"is_preprint":false},{"pmid":"24845384","id":"PMC_24845384","title":"Deubiquitination and stabilization of T-bet by USP10.","date":"2014","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/24845384","citation_count":42,"is_preprint":false},{"pmid":"28424242","id":"PMC_28424242","title":"mTORC1 Promotes T-bet Phosphorylation To Regulate Th1 Differentiation.","date":"2017","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/28424242","citation_count":40,"is_preprint":false},{"pmid":"29367462","id":"PMC_29367462","title":"High self-reactivity drives T-bet and potentiates Treg function in tissue-specific autoimmunity.","date":"2018","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/29367462","citation_count":38,"is_preprint":false},{"pmid":"14507763","id":"PMC_14507763","title":"T-bet expression is upregulated in active Behçet's disease.","date":"2003","source":"The British journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/14507763","citation_count":38,"is_preprint":false},{"pmid":"12007433","id":"PMC_12007433","title":"Asthma: T-bet--a master controller?","date":"2002","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/12007433","citation_count":37,"is_preprint":false},{"pmid":"29515240","id":"PMC_29515240","title":"T-bet promotes potent antitumor activity of CD4+ CAR T cells.","date":"2018","source":"Cancer gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/29515240","citation_count":37,"is_preprint":false},{"pmid":"34556887","id":"PMC_34556887","title":"T-bet and RORα control lymph node formation by regulating embryonic innate lymphoid cell differentiation.","date":"2021","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/34556887","citation_count":37,"is_preprint":false},{"pmid":"21182077","id":"PMC_21182077","title":"T-bet-mediated differentiation of the activated CD8+ T cell.","date":"2010","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21182077","citation_count":37,"is_preprint":false},{"pmid":"28289707","id":"PMC_28289707","title":"Eomesodermin and T-bet mark developmentally distinct human natural killer cells.","date":"2017","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/28289707","citation_count":36,"is_preprint":false},{"pmid":"26883725","id":"PMC_26883725","title":"T-bet expression by Th cells promotes type 1 inflammation but is dispensable for colitis.","date":"2016","source":"Mucosal immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26883725","citation_count":35,"is_preprint":false},{"pmid":"30784957","id":"PMC_30784957","title":"T-bet+ B cells: A common denominator in protective and autoreactive antibody responses?","date":"2019","source":"Current opinion in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30784957","citation_count":34,"is_preprint":false},{"pmid":"28641866","id":"PMC_28641866","title":"T-bet expressing B cells - Novel target for autoimmune therapies?","date":"2017","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/28641866","citation_count":34,"is_preprint":false},{"pmid":"31893939","id":"PMC_31893939","title":"DP1 Activation Reverses Age-Related Hypertension Via NEDD4L-Mediated T-Bet Degradation in T Cells.","date":"2020","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/31893939","citation_count":33,"is_preprint":false},{"pmid":"17705132","id":"PMC_17705132","title":"Transcriptional control of human T-BET expression: the role of Sp1.","date":"2007","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17705132","citation_count":32,"is_preprint":false},{"pmid":"32039762","id":"PMC_32039762","title":"c-Maf restrains T-bet-driven programming of CCR6-negative group 3 innate lymphoid cells.","date":"2020","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/32039762","citation_count":32,"is_preprint":false},{"pmid":"34160550","id":"PMC_34160550","title":"High Th2 cytokine levels and upper airway inflammation in human inherited T-bet deficiency.","date":"2021","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34160550","citation_count":32,"is_preprint":false},{"pmid":"34032636","id":"PMC_34032636","title":"T-bet+CD27+CD21- B cells poised for plasma cell differentiation during antibody-mediated rejection of kidney transplants.","date":"2021","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/34032636","citation_count":31,"is_preprint":false},{"pmid":"26880765","id":"PMC_26880765","title":"T-bet Regulates Natural Regulatory T Cell Afferent Lymphatic Migration and Suppressive Function.","date":"2016","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/26880765","citation_count":30,"is_preprint":false},{"pmid":"29297501","id":"PMC_29297501","title":"T-bet-independent Th1 response induces intestinal immunopathology during Toxoplasma gondii infection.","date":"2018","source":"Mucosal immunology","url":"https://pubmed.ncbi.nlm.nih.gov/29297501","citation_count":30,"is_preprint":false},{"pmid":"33462410","id":"PMC_33462410","title":"mTORC1 and mTORC2 coordinate early NK cell development by differentially inducing E4BP4 and T-bet.","date":"2021","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/33462410","citation_count":30,"is_preprint":false},{"pmid":"21395384","id":"PMC_21395384","title":"More than just a T-box: the role of T-bet as a possible biomarker and therapeutic target in autoimmune diseases.","date":"2011","source":"Immunotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/21395384","citation_count":29,"is_preprint":false},{"pmid":"30825520","id":"PMC_30825520","title":"CD8+T-bet+ cells as a predominant biomarker for inclusion body myositis.","date":"2019","source":"Autoimmunity reviews","url":"https://pubmed.ncbi.nlm.nih.gov/30825520","citation_count":28,"is_preprint":false},{"pmid":"15712176","id":"PMC_15712176","title":"T-bet, a T cell-associated transcription factor, is expressed in Hodgkin's lymphoma.","date":"2005","source":"Human pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15712176","citation_count":28,"is_preprint":false},{"pmid":"30687330","id":"PMC_30687330","title":"RUNX3 and T-Bet in Immunopathogenesis of Ankylosing Spondylitis-Novel Targets for Therapy?","date":"2019","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30687330","citation_count":27,"is_preprint":false},{"pmid":"28455436","id":"PMC_28455436","title":"Egr2 and 3 Inhibit T-bet-Mediated IFN-γ Production in T Cells.","date":"2017","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/28455436","citation_count":27,"is_preprint":false},{"pmid":"35852869","id":"PMC_35852869","title":"Human T-bet+ B cell development is associated with BTK activity and suppressed by evobrutinib.","date":"2022","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/35852869","citation_count":27,"is_preprint":false},{"pmid":"35064115","id":"PMC_35064115","title":"Adenosine receptor 2a agonists target mouse CD11c+T-bet+ B cells in infection and autoimmunity.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35064115","citation_count":26,"is_preprint":false},{"pmid":"21905017","id":"PMC_21905017","title":"Overexpression of T-bet gene regulates murine autoimmune arthritis.","date":"2012","source":"Arthritis and rheumatism","url":"https://pubmed.ncbi.nlm.nih.gov/21905017","citation_count":26,"is_preprint":false},{"pmid":"21540308","id":"PMC_21540308","title":"T-helper cell type-1 transcription factor T-bet is upregulated in pulmonary sarcoidosis.","date":"2011","source":"The European respiratory journal","url":"https://pubmed.ncbi.nlm.nih.gov/21540308","citation_count":26,"is_preprint":false},{"pmid":"31278374","id":"PMC_31278374","title":"T-bet optimizes CD4 T-cell responses against influenza through CXCR3-dependent lung trafficking but not functional programming.","date":"2019","source":"Mucosal immunology","url":"https://pubmed.ncbi.nlm.nih.gov/31278374","citation_count":25,"is_preprint":false},{"pmid":"27670243","id":"PMC_27670243","title":"T-bet inhibits innate lymphoid cell-mediated eosinophilic airway inflammation by suppressing IL-9 production.","date":"2016","source":"The Journal of allergy and clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27670243","citation_count":25,"is_preprint":false},{"pmid":"24575371","id":"PMC_24575371","title":"The immune cell transcription factor T-bet: A novel metabolic regulator.","date":"2013","source":"Adipocyte","url":"https://pubmed.ncbi.nlm.nih.gov/24575371","citation_count":25,"is_preprint":false},{"pmid":"25092994","id":"PMC_25092994","title":"Linking obesity with type 2 diabetes: the role of T-bet.","date":"2014","source":"Diabetes, metabolic syndrome and obesity : targets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/25092994","citation_count":24,"is_preprint":false},{"pmid":"26920461","id":"PMC_26920461","title":"Expression of T-bet, Eomesodermin and GATA-3 in porcine αβ T cells.","date":"2016","source":"Developmental and comparative immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26920461","citation_count":23,"is_preprint":false},{"pmid":"30322895","id":"PMC_30322895","title":"Loss of T-bet confers survival advantage to influenza-bacterial superinfection.","date":"2018","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/30322895","citation_count":23,"is_preprint":false},{"pmid":"33065758","id":"PMC_33065758","title":"Anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis is associated with IRF7, BANK1 and TBX21 polymorphisms in two populations.","date":"2020","source":"European journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/33065758","citation_count":22,"is_preprint":false},{"pmid":"40107244","id":"PMC_40107244","title":"T-bet+ CXCR3+ B cells drive hyperreactive B-T cell interactions in multiple sclerosis.","date":"2025","source":"Cell reports. Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40107244","citation_count":21,"is_preprint":false},{"pmid":"30254507","id":"PMC_30254507","title":"Dynamic DNA Methylation Changes of Tbx21 and Rorc during Experimental Autoimmune Uveitis in Mice.","date":"2018","source":"Mediators of inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/30254507","citation_count":21,"is_preprint":false},{"pmid":"35446923","id":"PMC_35446923","title":"Th17 cell plasticity towards a T-bet-dependent Th1 phenotype is required for bacterial control in Staphylococcus aureus infection.","date":"2022","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/35446923","citation_count":20,"is_preprint":false},{"pmid":"38336876","id":"PMC_38336876","title":"T-bet+ B cells are activated by and control endogenous retroviruses through TLR-dependent mechanisms.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38336876","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42325,"output_tokens":8802,"usd":0.129502,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18850,"output_tokens":5372,"usd":0.114275,"stage2_stop_reason":"end_turn"},"total_usd":0.243777,"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\": 2001,\n      \"finding\": \"T-bet induction by IFN-γ is dependent on STAT1 but not STAT4, establishing that IFN-γ drives T-bet expression through a STAT1-mediated autocrine loop that promotes further IFN-γ production.\",\n      \"method\": \"In vivo cytokine challenge with Toxoplasma gondii extract in IFN-γ-deficient and STAT1/STAT4-deficient mice; T-bet mRNA measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in multiple mouse strains with defined molecular readout, single lab\",\n      \"pmids\": [\"11752460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-bet represses Th2 lineage commitment through a tyrosine kinase-mediated physical interaction with GATA-3 that interferes with GATA-3 binding to its target DNA.\",\n      \"method\": \"Co-immunoprecipitation of T-bet and GATA-3; GATA-3 DNA-binding assays; T-bet tyrosine phosphorylation mutant analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct protein–protein interaction demonstrated by Co-IP, DNA binding interference assay, and phosphorylation-site mutagenesis in single rigorous study\",\n      \"pmids\": [\"15662016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"T-bet suppresses Th17 differentiation by physically interacting with Runx1 via T-bet Tyr304, blocking Runx1-mediated transactivation of Rorc (encoding RORγt).\",\n      \"method\": \"Co-immunoprecipitation of T-bet and Runx1; Rorc promoter transactivation assays; T-bet Y304 mutagenesis; T-bet-deficient mouse Th17 differentiation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reciprocal Co-IP, site-directed mutagenesis of the critical tyrosine, promoter assays, and in vivo genetic evidence in a single rigorous study\",\n      \"pmids\": [\"21151104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-bet and eomesodermin cooperatively induce CD122 (IL-15Rβ) expression, linking memory CD8+ T cell long-term renewal to cytotoxic effector programming; compound T-bet/Eomes deficiency abolishes IL-15-dependent lymphocyte lineages including memory CD8+ T cells and mature NK cells.\",\n      \"method\": \"Compound T-bet/Eomes double-mutant mice; flow cytometric enumeration of lymphocyte populations; CD122 expression analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic loss-of-function with multiple defined cellular phenotypes, replicated across multiple lymphocyte lineages\",\n      \"pmids\": [\"16273099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"T-bet is required in a stem cell-intrinsic manner for terminal maturation of NK cells and Vα14i NKT cells; T-bet expression in NK cells is regulated by NK-activating receptors and cytokines controlling NK development.\",\n      \"method\": \"T-bet-deficient mouse analysis; bone marrow chimera experiments establishing stem cell-intrinsic defect; flow cytometric characterization of NK/NKT maturation stages\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with chimera experiments establishing cell-intrinsic mechanism, multiple lymphocyte lineages examined\",\n      \"pmids\": [\"15084276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"T-bet directly regulates IgG class switching in B cells, particularly to IgG2a; T-bet-deficient B cells cannot generate germline or post-switch IgG2a transcripts in response to IFN-γ, and enforced T-bet expression initiates IgG2a switching in cell lines and primary cells.\",\n      \"method\": \"T-bet-deficient mouse B cell analysis; germline transcript RT-PCR; enforced T-bet expression in cell lines and primary B cells; isotype analysis by ELISA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function and gain-of-function experiments in both primary cells and cell lines, mechanistic transcriptional readout\",\n      \"pmids\": [\"11960012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"T-bet is selectively required for IgG2a class-switch recombination in response to T-independent (LPS) stimuli but not T-dependent (CD40) stimuli in B cells.\",\n      \"method\": \"T-bet-deficient B cell stimulation with LPS (T-independent) vs. CD40 ligation (T-dependent); germline IgG2a transcript analysis; isotype switching assays\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic loss-of-function with mechanistic pathway distinction, single lab\",\n      \"pmids\": [\"12882831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-bet controls Th1 cell migration to inflammatory sites by regulating PSGL-1-mediated binding to P-selectin on inflamed endothelium and by driving expression of the chemokine receptor CXCR3.\",\n      \"method\": \"T-bet-deficient mouse in vivo T cell trafficking assays; P-selectin binding assays; CXCR3 expression analysis by flow cytometry\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo trafficking experiments combined with direct binding assays and receptor expression analysis, multiple orthogonal methods\",\n      \"pmids\": [\"16014561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-bet-dependent expression of osteopontin (Opn) in activated T cells is essential for efficient skewing of CD4+ and CD8+ T cells toward Th1 and Tc1 programs; this regulation is T cell-specific and does not occur in macrophages.\",\n      \"method\": \"T-bet-deficient mouse T cell and macrophage analysis; Opn promoter studies; cytokine polarization assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with cell-type-specific mechanistic distinction, single lab\",\n      \"pmids\": [\"16286640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"T-bet represses IL-21 transcription in Th1 cells by inhibiting the binding of NFATc2 to the IL-21 proximal promoter, which in Th2 cells activates IL-21 transcription.\",\n      \"method\": \"IL-21 promoter activity assays; NFATc2 DNA-binding assays in presence/absence of T-bet; T helper subset-specific expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter assays and DNA-binding interference demonstrated, single lab\",\n      \"pmids\": [\"15684054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IFN-γ, CD122, and CXCR3 are direct gene targets of T-bet whose expression is acutely and directly regulated by T-bet activity, demonstrated by temporally controlled inducible T-bet system.\",\n      \"method\": \"Inducible T-bet-estrogen receptor fusion protein system with 4-hydroxytamoxifen; temporal on/off control of T-bet activity with gene expression readouts\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — inducible gain/loss-of-function system directly demonstrating acute T-bet-dependent gene regulation with temporal dissection\",\n      \"pmids\": [\"17339440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Ikaros directly represses the tbx21 (T-bet) promoter in Th2 cells by binding to it; loss of Ikaros DNA-binding activity during Th2 polarization results in increased T-bet expression and IFN-γ production.\",\n      \"method\": \"ChIP of Ikaros at endogenous tbx21 promoter in Th1 vs Th2 cells; Ikaros dominant-negative overexpression; in vivo parasite infection model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct promoter occupancy, loss-of-function with functional readout, single lab\",\n      \"pmids\": [\"19923223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EGR1 binds to the human T-BET promoter and induces T-bet transcription; EGR1 overexpression transactivates T-bet and synergizes with TCR signaling to induce T-bet expression, while EGR1 depletion decreases T-bet induction.\",\n      \"method\": \"Promoter reporter assays; EMSA demonstrating EGR1 binding to T-BET promoter; EGR1 overexpression and knockdown with T-bet expression readouts\",\n      \"journal\": \"Clinical immunology (Orlando, Fla.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA for direct binding, promoter assays, and gain/loss-of-function, single lab\",\n      \"pmids\": [\"19307156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Sp1 binds to six conserved sites in the proximal human T-BET promoter and positively regulates T-BET transcription; Sp1 overexpression increases T-BET expression and IFN-γ secretion in NK and T cells, while mithramycin A (Sp1 inhibitor) reduces both.\",\n      \"method\": \"EMSA demonstrating Sp1 binding to T-BET promoter; Sp1 overexpression; mithramycin A treatment of primary NK cells; dose-response promoter activity assays\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA for direct binding, promoter activity assays, gain-of-function and pharmacological inhibition with functional readout, single lab\",\n      \"pmids\": [\"17705132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"T-bet promotes short-lived effector CD8+ T cell differentiation over central memory formation by directly inducing CD122 and IL-15Rα expression (switching survival cytokine dependence from IL-7 to IL-15), downregulating CD127 and SOCS-1, and promoting IFN-γ and Fas ligand expression; ectopic T-bet expression plus high IL-2 drives Blimp-1 expression for terminal differentiation.\",\n      \"method\": \"In vitro ectopic T-bet expression in OT-I CD8+ T cells without inflammatory cytokines; gene expression analysis; IL-2 dose-response experiments\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ectopic expression system isolating T-bet-specific effects from cytokine effects, multiple gene targets examined, single lab\",\n      \"pmids\": [\"21182077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"T-bet regulates Tim-3 expression in Th1 cells; Tim-3 is a direct transcriptional target of T-bet, establishing a feedback loop whereby T-bet drives effector Th1 differentiation while simultaneously inducing a counter-regulatory molecule to terminate Th1 responses.\",\n      \"method\": \"T-bet-deficient mouse analysis; Tim-3 promoter studies; analysis of Th1-specific transcription factor requirements for Tim-3 expression\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with promoter analysis, single lab\",\n      \"pmids\": [\"20049876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"T-bet recruits epigenetic modifying complexes to target genes, specifically a Jmjd3 H3K27-demethylase and a Set7/9 H3K4-methyltransferase complex, enabling reversal of repressive and establishment of active epigenetic states at Th1 target loci.\",\n      \"method\": \"Co-immunoprecipitation of T-bet with Jmjd3 and Set7/9 complexes; histone modification analysis at T-bet target genes; chromatin studies\",\n      \"journal\": \"Immunological reviews\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of T-bet with histone-modifying complexes cited as established biochemical finding, review summarizing experimental data, single lab\",\n      \"pmids\": [\"20969596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"T-bet and GATA3 bind to multiple distal regulatory elements (enhancers) at immune regulatory genes in human effector T cells; T-bet directly activates its own expression by binding distal sites at the Tbx21 locus; T-bet is sufficient to induce GATA3 binding at T-bet target sites in Th1 cells.\",\n      \"method\": \"ChIP-seq for T-bet and GATA3 genome-wide; enhancer reporter assays; histone modification mapping; T-bet sufficiency experiments for GATA3 redistribution\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq with reporter validation and functional manipulation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"23232398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"T-bet subcellular localization in human CD8+ T cells is regulated by T-bet protein levels: T-bethi cells show predominantly nuclear T-bet, while T-betlo cells show predominantly cytoplasmic T-bet; TCR stimulation rapidly redistributes T-bet (but not Eomes) to the nucleus across all memory populations within 24 hours.\",\n      \"method\": \"Multiparameter flow cytometry with nuclear/cytoplasmic fractionation; TCR stimulation timecourse; analysis across human CD8 T cell memory subsets\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct subcellular localization by fractionation/flow cytometry, replicated across multiple human T cell subsets, single lab\",\n      \"pmids\": [\"23455505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In intestinal intraepithelial lymphocytes (IELs), T-bet cooperates with Runx3 to suppress conventional CD4+ Th functions and induce IEL-specific programming including CD8αα homodimer expression; IFN-γ sensing and T-bet expression are both required for this IEL maturation program.\",\n      \"method\": \"Gene loss- and gain-of-function in T cells; reporter mouse strains; analysis of IEL marker expression and CD4 Th function suppression\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with reporter approaches and functional readouts, single lab\",\n      \"pmids\": [\"25148025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"USP10 interacts with T-bet in the nucleus, directly inhibits T-bet ubiquitination, and stabilizes T-bet protein; Quercetin (a T-bet inhibitor) targets USP10 to promote T-bet proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation of USP10 and T-bet; ubiquitination assays; USP10 overexpression with T-bet stability readout; proteasome inhibitor experiments; Quercetin treatment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and direct ubiquitination assay demonstrating deubiquitinase-substrate relationship, single lab\",\n      \"pmids\": [\"24845384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ST2 (IL-33 receptor) expression on Th1 effector cells depends on T-bet and STAT4; T-bet-dependent ST2 expression allows IL-33 to act as a direct cofactor driving antiviral Th1 effector cell activation, expansion, and cytokine production.\",\n      \"method\": \"T-bet-deficient mouse analysis; mixed bone marrow chimeras; adoptive cell transfer; in vitro Th1 differentiation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with chimera and transfer experiments establishing T cell-intrinsic mechanism, single lab\",\n      \"pmids\": [\"25829541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"T-bet activates Th1 genes through enhancers by recruiting Mediator and P-TEFb (as part of the Super Elongation Complex), enabling transcriptional elongation of RNA polymerase II already stalled at Th1 gene promoters in Th2 cells; T-bet also activates enhancer RNA transcription via P-TEFb.\",\n      \"method\": \"ChIP for T-bet, Mediator, P-TEFb at Th1 gene loci; P-TEFb pharmacological inhibition; Mediator and SEC knockdown; Pol II occupancy analysis; P-TEFb inhibition in experimental autoimmune uveitis model\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal ChIP analyses, genetic knockdowns, pharmacological inhibition with gene expression and in vivo functional readouts in single rigorous study\",\n      \"pmids\": [\"27292648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"mTORC1 signaling controls T-bet phosphorylation at multiple sites in CD4+ T cells; mTORC1-dependent phosphorylation of T-bet is required for efficient recruitment of chromatin remodeling complexes to the Ifng gene promoter and IFN-γ expression.\",\n      \"method\": \"Targeted mass spectrometry (MRM-MS) identification of T-bet phosphorylation sites; Rheb-deficient CD4+ T cells; rapamycin treatment; alanine mutagenesis of phosphorylation sites; ChIP for chromatin remodeling complex recruitment\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS-based phosphosite identification, genetic and pharmacological mTORC1 inhibition, mutagenesis of sites, and ChIP as mechanistic readout in single study\",\n      \"pmids\": [\"28424242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEDD4L mediates ubiquitination and proteasomal degradation of T-bet in CD4+ T cells; the PKA/phospho-Sp1/NEDD4L pathway downstream of the prostaglandin D2/DP1 axis controls T-bet stability and Th1 cytokine production.\",\n      \"method\": \"T-bet ubiquitination assays; NEDD4L overexpression and deletion; T-bet conditional knockout in CD4+ T cells; Western blot for T-bet protein levels; hypertension model\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ubiquitination assay with identified E3 ligase and upstream pathway, genetic validation in vivo, single lab\",\n      \"pmids\": [\"31893939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Egr2 and Egr3 physically interact with the T-box domain of T-bet and block T-bet DNA binding, thereby inhibiting T-bet-mediated IFN-γ production in CD4+ and CD8+ effector T cells.\",\n      \"method\": \"Co-immunoprecipitation of Egr2/3 with T-bet; T-bet DNA-binding assays in presence of Egr2/3; Egr2/3-deficient T cells; Th1/Th17 differentiation assays; viral infection model\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP demonstrating direct physical interaction at T-box domain, DNA-binding interference assay, and genetic loss-of-function with functional readout\",\n      \"pmids\": [\"28455436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"T-bet+ Treg cells have an essential immunosuppressive function; loss of T-bet-expressing Treg cells (but not T-bet expression within Treg cells) causes severe Th1 autoimmunity; T-bet+ Treg cells specifically co-localize with and inhibit T-bet+ effector T cells and CD8 T cell activation.\",\n      \"method\": \"Conditional ablation of T-bet-expressing Treg cells vs. selective T-bet deletion within Treg cells; adoptive transfer; lineage tracing; infection models in mice\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — elegant conditional genetics distinguishing T-bet expression vs. T-bet+ cell presence, multiple orthogonal approaches, disease model validation\",\n      \"pmids\": [\"28607488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EOMES and T-BET regulate largely distinct gene sets during NK cell development: EOMES is dominant in immature NK cells and drives early lineage specification, while T-BET is dominant in mature NK cells where it induces IL-12 responsiveness and represses the cell cycle; both TFs show strong overlap in DNA binding targets with extensive epigenetic changes during differentiation.\",\n      \"method\": \"Gene-modified mice with endogenous ChIP tags for EOMES and T-BET; ChIP-seq; RNA-seq; ATAC-seq; conditional knockout models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — endogenous ChIP-seq with multiple orthogonal genomics approaches and conditional genetics, rigorous study\",\n      \"pmids\": [\"34521844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Human T-bet governs the differentiation of CD11chiCD21lo B cells by controlling chromatin accessibility at lineage-defining genes including FAS, IL21R, SEC61B, DUSP4, DAPP1, SOX5, CD79B, and CXCR4; inherited T-bet deficiency abrogates this B cell subset in vivo and in vitro.\",\n      \"method\": \"Patient with inherited T-bet deficiency; in vitro B cell differentiation assays; ATAC-seq for chromatin accessibility; flow cytometry; in vivo B cell subset analysis\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — human genetic loss-of-function combined with ATAC-seq mechanistic chromatin analysis, both in vivo and in vitro validation\",\n      \"pmids\": [\"35867801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"T-BET and EOMES in primary human NK cells are required for normal NK cell proliferation, persistence in vivo, cytokine responses, and antitumor function; deletion of these TFs causes CD56bright NK cells to acquire an ILC precursor-like profile with increased RORC and AHR, revealing T-box TF roles in suppressing alternative ILC lineages.\",\n      \"method\": \"CRISPR/Cas9 deletion of T-BET and EOMES in primary human NK cells; in vivo antitumor xenograft model; single-cell RNA-seq; cytokine stimulation assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — CRISPR loss-of-function in primary human cells with in vivo functional readout and scRNA-seq mechanistic characterization\",\n      \"pmids\": [\"37279078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"T-BET and EOMES ectopically expressed in human hematopoietic progenitors epigenetically repress HSC quiescence and non-NK lineage genes while activating NK-specific transcriptome; T-BET specifically controls terminal maturation markers and KIR expression epigenetically, while EOMES shows superior early NK maturation and CD16 induction.\",\n      \"method\": \"Ectopic T-BET or EOMES expression in human hematopoietic progenitor cells; transcriptome, ATAC-seq, and protein expression analyses; NK cell functional assays\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — gain-of-function with multi-omic mechanistic analysis (transcriptome + chromatin accessibility + protein) and functional validation\",\n      \"pmids\": [\"34630413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Transient T-bet expression epigenetically imprints the Ifng locus in Tfh cells, partially opening chromatin accessibility at the locus and enabling IFN-γ production in an 'ex-T-bet' Tfh subset; IFN-γ-expressing Tfh cells are absent in T-bet-deficient mice but present when T-bet is deleted only at late T cell differentiation stages.\",\n      \"method\": \"T-bet fate-mapping mouse strains; DNase I hypersensitivity analysis of Ifng locus; multicolor tissue imaging; T-bet conditional late-deletion mice\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — fate-mapping with epigenetic analysis and conditional deletion, multiple orthogonal approaches demonstrating epigenetic imprinting mechanism\",\n      \"pmids\": [\"30232200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"T-bet deletion during embryogenesis rescues lymph node formation in RORγt-deficient mice by skewing fetal ILC differentiation fate; mechanistically, T-bet deletion promotes accumulation of PLZFhi ILC progenitors expressing LTi molecules in a RORα-dependent fashion.\",\n      \"method\": \"Multiple conditional mouse models; single-cell analysis of fetal ILCs and ILC progenitors; T-bet/RORγt double-deficient mice; RORα genetic interaction experiments\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic mouse models with epistasis analysis and single-cell characterization revealing unexpected developmental role\",\n      \"pmids\": [\"34556887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"T-bet directly regulates transcription of the IL-23R in CD4+ T cells, thereby influencing the fate of Th17 cells which depend on IL-23 signaling for survival.\",\n      \"method\": \"T-bet siRNA knockdown in EAE model; IL-23R expression analysis in T-bet-deficient cells; therapeutic siRNA administration with clinical and cellular readouts\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcriptional regulation of IL-23R by T-bet demonstrated by knockdown with receptor expression readout, single lab\",\n      \"pmids\": [\"17237380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"T-bet in B cells drives IgG2c class switching and promotes IFN-γ and inflammatory macrophage accumulation in adipose tissue; T-bet-derived IgG from adipose B cells is a key mediator of metabolic inflammation in obesity, as confirmed by serum/IgG transfer experiments.\",\n      \"method\": \"B cell-specific Tbx21 knockout mice; B cell transfer experiments; serum and purified IgG transfer from HFD mice to T-bet+ B cell-deficient mice; cytokine and metabolic measurements\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific genetic deletion plus reconstitution/transfer experiments establishing causality, multiple orthogonal approaches\",\n      \"pmids\": [\"35868310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"T-bet expression in Th17 cells (via Tbx21-flox x Il17aCre) is required for Th17-to-Th1 transdifferentiation plasticity; blocking this transdifferentiation increases S. aureus tissue loads in a sepsis model.\",\n      \"method\": \"Conditional T-bet knockout in Th17 fate cells (Il17aCre x Tbx21-flox); Il17aCre x R26YFP fate-mapping; single-cell RNA-seq of renal Th17 fate cells; S. aureus sepsis model\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic deletion with fate-mapping and scRNA-seq plus in vivo functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"35446923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"c-Maf directly restrains T-bet expression in CCR6− ILC3s; conversely, c-Maf expression is dependent on T-bet, forming a negative feedback loop that preserves ILC3 identity by limiting T-bet-driven type 1 differentiation.\",\n      \"method\": \"c-Maf-deficient mouse phenotypic and transcriptomic profiling; direct c-Maf occupancy at T-bet locus; cytokine regulation of c-Maf and T-bet\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with transcriptomic analysis and direct occupancy data, single lab\",\n      \"pmids\": [\"32039762\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBX21/T-bet is a T-box transcription factor that drives type 1 immune responses by directly activating target genes (IFN-γ, CXCR3, CD122, Tim-3, IL-23R, Opn) through enhancer binding and P-TEFb/Mediator-dependent transcriptional elongation, recruiting epigenetic remodeling complexes (Jmjd3, Set7/9) to establish active chromatin states, while simultaneously repressing alternative lineage programs (Th2, Th17) via physical interactions with GATA-3 (blocking its DNA binding in a tyrosine kinase-dependent manner) and Runx1 (blocking Rorc transactivation via Tyr304-dependent complex formation); T-bet protein stability is regulated by ubiquitination (degraded via NEDD4L, stabilized by deubiquitinase USP10) and by mTORC1-dependent phosphorylation at multiple sites required for chromatin remodeling complex recruitment, while T-bet transcription is induced upstream by IFN-γ/STAT1 signaling and directly by EGR1 and Sp1, and antagonized by Ikaros and Egr2/3 (which block T-bet DNA binding at its T-box domain).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TBX21 (T-bet) is a T-box transcription factor that serves as the master driver of type 1 immune programming across CD4+ Th1, CD8+ Tc1, NK, NKT, B, and innate lymphoid cell lineages [#10, #17, #4]. It functions by binding distal enhancers and promoters at type 1 immune genes — directly activating IFN-\\u03b3, CD122/IL-15R\\u03b2, CXCR3, Tim-3, IL-23R, and osteopontin, and even autoactivating its own locus [#10, #17, #15, #33, #8]. Transcriptional activation proceeds through recruitment of Mediator and P-TEFb (the Super Elongation Complex) to license elongation of RNA Pol II stalled at Th1 promoters, and through recruitment of Jmjd3 (H3K27 demethylase) and Set7/9 (H3K4 methyltransferase) complexes that establish active chromatin and epigenetically imprint loci such as Ifng [#22, #16, #31]. In parallel, T-bet enforces lineage fidelity by repressing alternative programs: it physically engages GATA-3 in a tyrosine-kinase-dependent manner to block its DNA binding (Th2), interacts with Runx1 via Tyr304 to prevent Rorc transactivation (Th17), and inhibits NFATc2 binding at the IL-21 promoter [#1, #2, #9]. T-bet activity is set by both transcriptional inputs — induced by IFN-\\u03b3/STAT1 signaling and by EGR1 and Sp1, and repressed by Ikaros, c-Maf, and Egr2/3 (which bind the T-box domain to block DNA binding) — and by protein-level control through ubiquitination (NEDD4L-mediated degradation, USP10-mediated stabilization), mTORC1-dependent phosphorylation required for chromatin remodeler recruitment, and nuclear/cytoplasmic partitioning [#0, #12, #13, #11, #36, #25, #24, #20, #23, #18]. Beyond T cells, T-bet cooperates with Eomes to govern NK and memory CD8 cell maturation and with Runx3 to program intestinal IELs, and drives B cell IgG2a/IgG2c class switching; inherited human T-bet deficiency abrogates the CD11chiCD21lo B cell subset [#3, #27, #19, #5, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the upstream signal that induces T-bet, defining a STAT1-dependent IFN-\\u03b3 autocrine loop rather than the STAT4/IL-12 axis as the trigger for T-bet expression.\",\n      \"evidence\": \"Cytokine challenge in IFN-\\u03b3-, STAT1-, and STAT4-deficient mice with T-bet mRNA readout\",\n      \"pmids\": [\"11752460\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not map the cis-elements at the Tbx21 locus mediating STAT1 responsiveness\", \"Single lab, in vivo readout only\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended T-bet function beyond T cells, showing it directly controls IgG2a class switching in B cells downstream of IFN-\\u03b3.\",\n      \"evidence\": \"Loss- and gain-of-function in B cells with germline transcript and isotype readouts\",\n      \"pmids\": [\"11960012\", \"12882831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct promoter/enhancer targets at the Igh locus not mapped\", \"Stimulus dependence (T-independent vs T-dependent) mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated a cell-intrinsic requirement for T-bet in terminal NK and NKT maturation, broadening its role to innate lymphocytes.\",\n      \"evidence\": \"T-bet-deficient mice and bone marrow chimeras with flow cytometric maturation staging\",\n      \"pmids\": [\"15084276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets driving NK maturation not defined here\", \"Relationship to Eomes not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the molecular basis of lineage repression, showing T-bet blocks Th2 commitment by a tyrosine-kinase-dependent physical interaction with GATA-3 that prevents GATA-3 DNA binding.\",\n      \"evidence\": \"Co-IP, GATA-3 DNA-binding assays, and phospho-mutant analysis\",\n      \"pmids\": [\"15662016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The responsible tyrosine kinase not identified\", \"Stoichiometry and genomic locations of the interaction unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified T-bet's role in coupling effector function to migration and survival, regulating CXCR3/PSGL-1-mediated trafficking, osteopontin-driven polarization, IL-21 repression, and (with Eomes) CD122/IL-15 responsiveness.\",\n      \"evidence\": \"T-bet-deficient mice, trafficking and binding assays, promoter studies, and T-bet/Eomes compound mutants\",\n      \"pmids\": [\"16014561\", \"16286640\", \"15684054\", \"16273099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect target status not resolved for all genes in these studies\", \"Division of labor between T-bet and Eomes at shared targets unmapped\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Distinguished direct from indirect T-bet targets using temporal control, confirming IFN-\\u03b3, CD122, CXCR3, and IL-23R as acutely T-bet-regulated genes.\",\n      \"evidence\": \"Inducible T-bet-ER fusion with 4-OHT and gene expression timecourse; siRNA knockdown in EAE for IL-23R\",\n      \"pmids\": [\"17339440\", \"17237380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve enhancer vs promoter binding genome-wide\", \"Cofactor requirements for acute activation not addressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified the transcriptional activators of T-bet itself, showing EGR1 and Sp1 bind the human T-BET promoter to induce its expression.\",\n      \"evidence\": \"EMSA, promoter reporter assays, gain/loss-of-function, and Sp1 pharmacological inhibition\",\n      \"pmids\": [\"17705132\", \"19307156\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration with STAT1/TCR signaling at the promoter not fully resolved\", \"Single lab per factor\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified Ikaros as a direct repressor of the Tbx21 promoter in Th2 cells, establishing transcriptional gating of T-bet during lineage choice.\",\n      \"evidence\": \"ChIP at the endogenous tbx21 promoter, Ikaros dominant-negative, and in vivo infection\",\n      \"pmids\": [\"19923223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Ikaros recruitment and corepressor partners unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the chromatin-modifying machinery T-bet uses, showing recruitment of Jmjd3 (H3K27 demethylase) and Set7/9 (H3K4 methyltransferase) complexes, and refined repression mechanism via Runx1/Tyr304 and counter-regulation via Tim-3.\",\n      \"evidence\": \"Co-IP of T-bet with histone modifiers, histone modification mapping, Runx1 Co-IP/Y304 mutagenesis, and Tim-3 promoter analysis\",\n      \"pmids\": [\"20969596\", \"21151104\", \"20049876\", \"21182077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and genome-wide distribution of T-bet/Jmjd3/Set7-9 complexes not mapped\", \"How phosphorylation gates these interactions not yet linked\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the genome-wide enhancer logic, showing T-bet and GATA3 co-occupy distal regulatory elements, T-bet autoactivates its locus, and T-bet redirects GATA3 binding.\",\n      \"evidence\": \"ChIP-seq for T-bet and GATA3, enhancer reporter assays, and sufficiency experiments\",\n      \"pmids\": [\"23232398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of every co-bound enhancer not validated\", \"Mechanism of GATA3 redistribution unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the activation mechanism at the level of Pol II, showing T-bet recruits Mediator and P-TEFb/SEC to release stalled polymerase and drive elongation and enhancer RNA transcription.\",\n      \"evidence\": \"ChIP for T-bet/Mediator/P-TEFb, knockdowns, P-TEFb pharmacological inhibition, and an EAU model\",\n      \"pmids\": [\"27292648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct contact surface between T-bet and SEC components not defined\", \"How elongation control integrates with chromatin remodeling unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established post-translational control of T-bet, identifying NEDD4L-mediated degradation, USP10-mediated stabilization, mTORC1-dependent phosphorylation required for remodeler recruitment, and Egr2/3 as T-box-domain DNA-binding blockers.\",\n      \"evidence\": \"Ubiquitination assays, Co-IP, MRM-MS phosphosite mapping, phospho/site mutagenesis, and genetic loss-of-function with ChIP and functional readouts\",\n      \"pmids\": [\"31893939\", \"24845384\", \"28424242\", \"28455436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphosites linked to specific remodeler interactions not fully mapped\", \"Crosstalk between ubiquitination, phosphorylation, and localization not integrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Distinguished the role of T-bet expression from the presence of T-bet+ cells, showing T-bet+ Treg cells are an essential suppressive population restraining type 1 autoimmunity.\",\n      \"evidence\": \"Conditional ablation of T-bet+ Treg cells vs selective T-bet deletion, adoptive transfer, and lineage tracing\",\n      \"pmids\": [\"28607488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets enabling Treg suppressive function not defined\", \"Mechanism of co-localization with effector cells unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated epigenetic memory, showing transient T-bet expression imprints the Ifng locus to license later IFN-\\u03b3 production in 'ex-T-bet' Tfh cells.\",\n      \"evidence\": \"T-bet fate-mapping, DNase I hypersensitivity at Ifng, and late conditional deletion\",\n      \"pmids\": [\"30232200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of heritable chromatin mark not identified\", \"Reversibility and durability of imprinting unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Dissected the T-bet/Eomes division of labor in NK biology and lineage fidelity, showing largely distinct yet overlapping programs, suppression of alternative ILC fates, and developmental control of ILC differentiation.\",\n      \"evidence\": \"Endogenous-tag ChIP-seq/RNA-seq/ATAC-seq, CRISPR deletion in primary human NK cells, ectopic expression in progenitors, and conditional/epistasis mouse models\",\n      \"pmids\": [\"34521844\", \"37279078\", \"34630413\", \"34556887\", \"32039762\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanistic basis for repressing RORC/AHR ILC programs not fully defined\", \"Quantitative rules for T-bet vs Eomes target selection unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined human disease relevance and tissue-specific roles, showing inherited T-bet deficiency abrogates CD11chiCD21lo B cells, and T-bet drives Th17-to-Th1 plasticity and adipose B cell IgG-mediated metabolic inflammation.\",\n      \"evidence\": \"Patient with inherited T-bet deficiency with ATAC-seq, conditional B/Th17 knockouts, fate-mapping, scRNA-seq, and IgG transfer experiments\",\n      \"pmids\": [\"35867801\", \"35446923\", \"35868310\", \"25148025\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of human T-bet-deficiency phenotypes not enumerated\", \"Direct targets driving each tissue-specific program incompletely mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How T-bet's distinct post-translational modifications (phosphorylation, ubiquitination), localization control, and chromatin-modifier recruitment are mechanistically integrated to select context-specific target genes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of T-bet bound to its remodeler or SEC partners\", \"Rules governing T-bet vs Eomes target partitioning incompletely defined\", \"Direct contact surfaces for repressive interactions (GATA-3, Runx1, Egr2/3) not structurally resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [10, 17, 22, 5, 15, 33]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [17, 25, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 9, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 20, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 17, 4, 26, 28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 17, 22]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [16, 31, 28, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 27, 32, 30]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GATA3\", \"RUNX1\", \"EOMES\", \"USP10\", \"NEDD4L\", \"EGR2\", \"JMJD3\", \"SET7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}