{"gene":"TBXT","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":1995,"finding":"Brachyury (T) orthologs were cloned from amphioxus, demonstrating conservation of the gene across all three chordate subphyla. Spatial and temporal expression studies showed Brachyury transcripts distributed throughout the notochord anteroposterior axis and in presumptive mesoderm, supporting ancient roles in notochord differentiation predating roles in mesoderm formation.","method":"cDNA cloning, in situ hybridization, phylogenetic analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — expression with functional inference across phyla, single study","pmids":["8575328"],"is_preprint":false},{"year":1996,"finding":"The human T gene was cloned and characterized: it encodes a transcription factor with 91% overall amino acid identity to mouse T protein and 100% identity across the 77-amino-acid T-box DNA-binding domain. Human T expression is confined to notochord-derived cells, and the gene maps to chromosome 6q27.","method":"cDNA cloning, genomic library screening, expression analysis, chromosomal mapping","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 1-2 — direct sequencing and structural characterization, foundational study","pmids":["8963900"],"is_preprint":false},{"year":2001,"finding":"T-box proteins including Brachyury regulate downstream effector genes by binding T-box binding elements (T-sites) in target gene promoters; the specificity of individual T-box factors is determined by the precise sequence of the T-site and flanking nucleotides, enabling distinct transcriptional programs.","method":"Review integrating reporter assays, gel-shift assays, and mutagenesis from multiple studies","journal":"Development, growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 3 — synthesis review; functional specificity supported by multiple cited experimental studies","pmids":["11148447"],"is_preprint":false},{"year":2006,"finding":"Brachyury (T) protein was localized by immunohistochemistry to the primitive streak, nascent embryonic mesoderm, node, notochord, notochord-associated endoderm, posterior neurectoderm, and allantois midline during mouse gastrulation. Novel sites including the developing heart, visceral endoderm, extraembryonic ectoderm, and chorionic ectoderm were also identified, demonstrating broader spatiotemporal activity than previously appreciated.","method":"Sectional immunohistochemistry in mouse conceptus across gastrulation stages","journal":"Gene expression patterns : GEP","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein localization by IHC across multiple tissues, single lab study","pmids":["16545989"],"is_preprint":false},{"year":2009,"finding":"Germline duplication of the T (brachyury) gene locus on chromosome 6q27 was identified in four multiplex chordoma families with at least three affected members each. The duplicated region contained only the T gene, establishing T gene copy-number gain as a susceptibility mechanism for familial chordoma.","method":"High-resolution array-CGH on familial chordoma cases and controls","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — replicated across four independent families with orthogonal genomic methods","pmids":["19801981"],"is_preprint":false},{"year":2010,"finding":"Chromosomal aberrations resulting in copy-number gain of the T locus are common in sporadic chordomas (~46% of cases including polysomy and amplification). Knockdown of T in chordoma cell line U-CH1 caused marked decrease in cell proliferation and morphological features of senescence, demonstrating that brachyury expression is critical for chordoma cell proliferation in vitro.","method":"FISH, qPCR, array-CGH, shRNA knockdown, xenograft validation in NOD/SCID mice","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genomic methods plus functional KD with defined phenotype, xenograft validation","pmids":["21171078"],"is_preprint":false},{"year":2011,"finding":"BMP4 cooperates with FGF2/ERK signaling to induce mesoderm differentiation from human and mouse pluripotent stem cells via BRACHYURY (BRA). BRA was necessary for and preceded CDX2 expression; both genes were required for mesodermal and trophoblast-associated gene expression, establishing BRA as a key mediator of BMP-induced mesoderm specification rather than trophoblast lineage commitment.","method":"shRNA knockdown in hESCs, gene expression analysis, epistasis experiments with FGF/BMP signaling","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with defined lineage phenotypes, multiple orthogonal approaches in human and mouse cells","pmids":["21816365"],"is_preprint":false},{"year":2012,"finding":"Using shRNA-mediated knockdown, ChIP-seq, and gene expression microarray in a chordoma cell line, brachyury was shown to act primarily as a transcriptional activator, binding 99 direct target genes via the T-box binding motif (identical to that in mouse, Xenopus, and zebrafish). Brachyury was identified as a master regulator of an oncogenic transcriptional network encompassing cell cycle components and extracellular matrix genes.","method":"shRNA knockdown, ChIP-seq, gene expression microarray, bioinformatics, validation in human chordoma samples","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq plus functional KD plus expression arrays, multiple orthogonal methods","pmids":["22847733"],"is_preprint":false},{"year":2012,"finding":"A common nonsynonymous SNP in the T gene (rs2305089) was strongly associated with chordoma risk (OR=6.1, P=4.4×10⁻⁹) in a genome-wide association study replicated in an independent cohort, implicating variation in TBXT itself as a direct genetic risk factor for chordoma.","method":"GWAS with whole-exome and Sanger sequencing, replication cohort","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — replicated genetic association with functional candidate SNP in coding sequence","pmids":["23064415"],"is_preprint":false},{"year":2013,"finding":"Brachyury expression in human lung carcinoma cells correlates with resistance to chemotherapy and radiation. Chromatin immunoprecipitation and luciferase reporter assays demonstrated that Brachyury directly binds a half T-box consensus site in the CDKN1A (p21) gene promoter, repressing its expression, downregulating cyclin D1 and phosphorylated Rb, and thereby slowing cell cycle progression to confer therapeutic resistance.","method":"ChIP, luciferase reporter assays, in vitro cytotoxicity, in vivo xenograft chemotherapy experiments","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — direct ChIP and promoter reporter assays establishing mechanism, supported by in vivo xenograft data","pmids":["23788039"],"is_preprint":false},{"year":2014,"finding":"In chordoma cell lines, FGF2 activates the FGFR/MEK/ERK signaling cascade, which phosphorylates FRS2-α and promotes nuclear translocation of phospho-ERK, resulting in increased brachyury expression. Brachyury in turn maintains FGF2 secretion and FGFR/MEK/ERK phosphorylation, forming a positive feedback loop that promotes cell growth, survival, and epithelial-mesenchymal transition. Knockdown of brachyury disrupted this loop and induced apoptosis.","method":"Western blot, ELISA, immunofluorescence, selective kinase inhibitors, shRNA knockdown of brachyury","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 2 — multiple pharmacologic inhibitors plus genetic KD establishing pathway position with defined cellular phenotypes","pmids":["24445144"],"is_preprint":false},{"year":2015,"finding":"Genome-wide ChIP-seq in differentiating hESCs revealed that Brachyury (BRA) has distinct binding landscapes in BMP4-induced mesoderm versus activin-A-induced endoderm progenitors. BRA physically interacts and collaborates with SMAD1 (in mesoderm) or SMAD2/3 (in endoderm) to regulate cell-specific target gene expression. Manipulation of BRA levels showed it is essential for mesoderm but not endoderm formation.","method":"ChIP-seq, co-immunoprecipitation, gene expression analysis, BRA level manipulation in hESCs","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq plus Co-IP establishing physical interaction with SMADs, plus epistasis demonstrating mesoderm-specific requirement","pmids":["26015544"],"is_preprint":false},{"year":2017,"finding":"Somatic duplications of the brachyury (T) locus were identified in up to 27% of sporadic chordoma cases, with rearrangement architecture recapitulating the pathogenic germline duplications of familial chordoma. PI3K signaling mutations were found in 16% of cases, and LYST was recurrently inactivated in 10%.","method":"Whole-genome sequencing, copy-number analysis of 104 sporadic chordoma cases","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — large-scale genomic study independently replicating T locus duplication as somatic driver","pmids":["29026114"],"is_preprint":false},{"year":2019,"finding":"Two linked TBXT variants (missense c.334G>T causing p.Gly112Trp in the T-box domain, plus synonymous c.333G>C) were associated with the tailless phenotype in fat-rumped sheep. Crossbreeding showed the CT/CT genotype (recessive) causes tail shortening, indicating the Gly112Trp substitution in the T-box DNA-binding domain impairs TBXT function in tail development.","method":"Direct sequencing of exon 2 in 301 individuals from 13 breeds, genotyping of 380 samples, crossbreeding experiments","journal":"Animal genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic association plus crossbreeding epistasis; no in vitro functional assay of mutant protein","pmids":["31475743"],"is_preprint":false},{"year":2020,"finding":"Pharmacologic inhibition of H3K27 demethylases KDM6A (UTX) and KDM6B (JMJD3) with compound KDOBA67 caused genome-wide increase in repressive H3K27me3 at the TBXT locus with concomitant reduction of active marks (H3K27ac, H3K9ac, H3K4me3), leading to reduced TBXT protein levels and chordoma cell death. Ectopic overexpression of TBXT rescued viability, demonstrating that TBXT is a direct target of KDM6A/B-dependent epigenetic regulation and is required for chordoma cell survival.","method":"Pharmacologic KDM6A/B inhibition, CRISPR/Cas9 dual KO of KDM6A/B, ChIP-seq (H3K27me3, H3K27ac, H3K4me3), TBXT overexpression rescue, primary patient-derived cultures","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq epigenomic mapping plus genetic CRISPR KO plus rescue overexpression, multiple models including primary cells","pmids":["32855205"],"is_preprint":false},{"year":2020,"finding":"A de novo missense mutation in TBXT (c.G47T; p.R16L) was identified by whole-exome sequencing in a congenital scoliosis patient. The R16L substitution compromised TBXT binding to its target DNA sequence, reduced transcriptional activity, and exhibited a dominant-negative effect on wild-type TBXT, establishing that TBXT transcriptional activity in the T-box domain is required for normal vertebral development.","method":"Whole-exome sequencing, DNA-binding assay, transcriptional activity reporter assay, dominant-negative functional analysis","journal":"Journal of orthopaedic research","confidence":"Medium","confidence_rationale":"Tier 1-2 — direct functional assays of mutant protein DNA binding and transcriptional activity, single lab","pmids":["32672867"],"is_preprint":false},{"year":2024,"finding":"A hominoid-specific Alu element insertion in an intron of TBXT pairs with an ancestral reverse-oriented Alu element to produce an alternative splicing event that skips an exon. Mouse models co-expressing full-length and exon-skipped Tbxt isoforms (mimicking hominoid TBXT expression) displayed complete tail loss or shortened tails depending on relative isoform abundance in the embryonic tail bud. Mice expressing only the exon-skipped isoform also developed neural tube defects, linking TBXT alternative splicing to both tail-loss evolution and neural tube defect risk.","method":"Transgenic mouse models with controlled Tbxt isoform expression, genetic epistasis, embryological phenotyping","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — multiple transgenic mouse lines with dose-dependent isoform expression phenotypes, mechanistic link to alternative splicing established","pmids":["38418917"],"is_preprint":false}],"current_model":"TBXT (brachyury) encodes a T-box transcription factor that binds T-box DNA elements via its conserved T-box domain to activate target genes involved in mesoderm specification, notochord differentiation, and epithelial-mesenchymal transition; it physically collaborates with SMAD1 or SMAD2/3 in a context-dependent manner, is maintained in an active chromatin state by KDM6A/B-mediated H3K27 demethylation, directly represses CDKN1A (p21) to slow cell cycle progression, participates in a positive FGFR/MEK/ERK feedback loop in chordoma, and in hominoids undergoes Alu-element-mediated alternative splicing whose relative isoform balance governs tail development and neural tube closure."},"narrative":{"teleology":[{"year":1995,"claim":"Cloning of amphioxus brachyury established that the gene is conserved across all three chordate subphyla and suggested that its ancestral role in notochord differentiation predates its functions in mesoderm formation.","evidence":"cDNA cloning, in situ hybridization, and phylogenetic analysis in amphioxus","pmids":["8575328"],"confidence":"Medium","gaps":["Functional conservation inferred from expression only; no loss-of-function data in amphioxus","Regulatory elements driving notochord versus mesoderm expression not dissected"]},{"year":1996,"claim":"Cloning of the human T gene revealed near-complete identity of the T-box DNA-binding domain with mouse T and restricted expression to notochord-derived cells, establishing the molecular foundation for studying TBXT function in humans.","evidence":"cDNA cloning, genomic library screening, expression analysis, chromosomal mapping to 6q27","pmids":["8963900"],"confidence":"High","gaps":["Downstream transcriptional targets in human cells unknown","No functional assay of human T protein activity"]},{"year":2001,"claim":"Synthesis of promoter-binding studies clarified that T-box proteins including brachyury achieve target gene specificity through sequence-specific recognition of T-box binding elements, with flanking nucleotide context governing individual factor selectivity.","evidence":"Review integrating gel-shift assays, reporter assays, and mutagenesis from multiple labs","pmids":["11148447"],"confidence":"Medium","gaps":["Genome-wide binding landscape not yet mapped","No structural explanation for flanking-sequence discrimination"]},{"year":2009,"claim":"Identification of germline TBXT locus duplications in four multiplex chordoma families established copy-number gain of this single gene as a heritable susceptibility mechanism for familial chordoma, directly linking TBXT dosage to tumorigenesis.","evidence":"High-resolution array-CGH in familial chordoma kindreds and controls","pmids":["19801981"],"confidence":"High","gaps":["Mechanism by which extra TBXT copies drive transformation not defined","Penetrance and modifier loci uncharacterized"]},{"year":2010,"claim":"Functional knockdown of TBXT in chordoma cells demonstrated that its expression is essential for chordoma proliferation, and genomic analyses revealed somatic copy-number gain in nearly half of sporadic chordomas, confirming TBXT as a bona fide oncogenic driver in this tumor type.","evidence":"FISH, qPCR, array-CGH, shRNA knockdown in U-CH1, xenograft validation","pmids":["21171078"],"confidence":"High","gaps":["Direct transcriptional targets mediating the proliferative requirement not identified at this stage","Whether TBXT knockdown effect is cytostatic versus apoptotic not fully resolved"]},{"year":2011,"claim":"Epistasis experiments in human ESCs resolved a long-standing question about BMP4-induced cell fate by showing that TBXT is required for and precedes CDX2 expression during mesoderm specification, placing it upstream in the BMP4/FGF2-to-mesoderm differentiation cascade.","evidence":"shRNA knockdown in hESCs, gene expression analysis, epistasis with FGF/BMP signaling","pmids":["21816365"],"confidence":"High","gaps":["Direct versus indirect regulation of CDX2 by TBXT not distinguished","Mechanism of FGF2 cooperation with BMP4 at the TBXT locus not resolved"]},{"year":2012,"claim":"ChIP-seq in chordoma cells revealed that TBXT acts predominantly as a transcriptional activator, directly binding 99 target genes through the conserved T-box motif and orchestrating an oncogenic network encompassing cell-cycle and extracellular matrix genes; concurrently, a GWAS identified a coding SNP (rs2305089) as a strong chordoma risk allele.","evidence":"ChIP-seq, shRNA knockdown, expression microarray in chordoma; GWAS with replication cohort","pmids":["22847733","23064415"],"confidence":"High","gaps":["How the risk SNP alters TBXT protein function or expression not mechanistically resolved","Whether the 99 direct targets are universal or chordoma-specific unknown"]},{"year":2013,"claim":"Direct ChIP and reporter assays demonstrated that TBXT represses CDKN1A (p21) by binding a half T-box site in its promoter, thereby slowing cell-cycle progression and conferring resistance to chemotherapy and radiation—revealing a specific mechanism for TBXT-driven therapeutic resistance.","evidence":"ChIP, luciferase reporter assays, in vitro cytotoxicity, in vivo xenograft chemotherapy in lung carcinoma cells","pmids":["23788039"],"confidence":"High","gaps":["Whether p21 repression is the sole or primary mediator of therapeutic resistance not established","Applicability of this mechanism to chordoma versus other TBXT-expressing tumors not tested"]},{"year":2014,"claim":"A positive feedback loop was delineated in which FGF2 activates FGFR/MEK/ERK to upregulate TBXT, and TBXT in turn maintains FGF2 secretion and pathway phosphorylation, promoting chordoma growth, survival, and EMT.","evidence":"Western blot, ELISA, selective kinase inhibitors, shRNA knockdown in chordoma cells","pmids":["24445144"],"confidence":"High","gaps":["Whether TBXT directly transcribes FGF2 or acts indirectly not resolved","Contribution of other RTK pathways to the feedback loop not assessed"]},{"year":2015,"claim":"Genome-wide binding analysis in differentiating hESCs showed that TBXT occupies distinct chromatin landscapes depending on signaling context, physically interacting with SMAD1 in BMP4-induced mesoderm and with SMAD2/3 in activin-A-induced endoderm, establishing context-dependent cofactor usage as the basis for lineage-specific transcriptional programs.","evidence":"ChIP-seq, co-immunoprecipitation, BRA-level manipulation in hESCs","pmids":["26015544"],"confidence":"High","gaps":["Structural basis for selective SMAD1 versus SMAD2/3 interaction unknown","Whether additional cofactors participate in each complex not addressed"]},{"year":2020,"claim":"Pharmacologic and genetic ablation of KDM6A/B demethylases increased H3K27me3 at the TBXT locus, silencing its expression and killing chordoma cells—an effect rescued by ectopic TBXT—thereby identifying KDM6A/B-mediated epigenetic maintenance as essential for TBXT transcription in chordoma, and a de novo TBXT missense mutation (R16L) in a congenital scoliosis patient was shown to impair DNA binding and act dominant-negatively, linking TBXT loss-of-function to vertebral malformation.","evidence":"KDM6A/B inhibitor + CRISPR KO + ChIP-seq + rescue overexpression in chordoma; WES + DNA-binding and reporter assays for R16L variant","pmids":["32855205","32672867"],"confidence":"High","gaps":["Whether KDM6A versus KDM6B has non-redundant roles at the TBXT locus not fully resolved","R16L finding from a single patient; population-level confirmation of congenital scoliosis link pending"]},{"year":2024,"claim":"A hominoid-specific Alu-element insertion was shown to generate an exon-skipped TBXT isoform whose co-expression with full-length TBXT in transgenic mice phenocopied tail loss in a dose-dependent manner, directly explaining hominoid tail-loss evolution; expression of the exon-skipped isoform alone also caused neural tube defects, revealing a pleiotropic consequence of the same splicing event.","evidence":"Multiple transgenic mouse lines with controlled Tbxt isoform expression, genetic epistasis, embryological phenotyping","pmids":["38418917"],"confidence":"High","gaps":["Molecular mechanism by which the truncated isoform interferes with full-length TBXT function not defined","Whether neural tube defect risk in humans is modulated by quantitative isoform balance remains untested","No structural data on the exon-skipped protein product"]},{"year":null,"claim":"Key unresolved questions include the structural basis for context-dependent SMAD cofactor selection, whether the exon-skipped isoform acts as a dominant-negative or has independent activity, and the full catalog of direct transcriptional targets during normal human embryogenesis versus oncogenesis.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of TBXT in complex with SMAD partners","Genome-wide target maps in normal human gastrulation tissue lacking","Therapeutic window for TBXT inhibition in chordoma versus developmental toxicity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,2,7,9,15]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,7,9,11,15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,10,14]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,6,11,16]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,7,9,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,10,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[4,5,8,12]}],"complexes":[],"partners":["SMAD1","SMAD2","SMAD3","KDM6A","KDM6B","CDX2","FGFR1"],"other_free_text":[]},"mechanistic_narrative":"TBXT (brachyury) is a deeply conserved T-box transcription factor that serves as a master regulator of mesoderm specification, notochord differentiation, and axial elongation across chordates. It binds T-box DNA elements in target gene promoters primarily as a transcriptional activator, partnering context-dependently with SMAD1 during BMP4-driven mesoderm induction or with SMAD2/3 during activin-A-driven endoderm patterning, and directly represses CDKN1A (p21) to slow cell-cycle progression [PMID:26015544, PMID:22847733, PMID:23788039]. TBXT expression is maintained by KDM6A/B-mediated H3K27 demethylation and participates in a positive FGFR/MEK/ERK feedback loop; germline duplication or common coding variants at the TBXT locus confer susceptibility to chordoma, while loss-of-function mutations cause congenital vertebral malformations [PMID:32855205, PMID:24445144, PMID:19801981, PMID:32672867]. In hominoids, an Alu-element-mediated alternative splicing event produces an exon-skipped isoform whose relative abundance governs tail loss and modulates neural tube closure risk [PMID:38418917]."},"prefetch_data":{"uniprot":{"accession":"O15178","full_name":"T-box transcription factor T","aliases":["Brachyury protein","Protein T"],"length_aa":435,"mass_kda":47.4,"function":"Involved in the transcriptional regulation of genes required for mesoderm formation and differentiation. Binds to a palindromic T site 5'-TTCACACCTAGGTGTGAA-3' DNA sequence and activates gene transcription when bound to such a site","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O15178/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TBXT","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TBXT","total_profiled":1310},"omim":[{"mim_id":"620695","title":"NOTOCHORD HOMEOBOX; NOTO","url":"https://www.omim.org/entry/620695"},{"mim_id":"601397","title":"T-BOX TRANSCRIPTION FACTOR T; TBXT","url":"https://www.omim.org/entry/601397"},{"mim_id":"215400","title":"CHORDOMA, SUSCEPTIBILITY TO; CHDM","url":"https://www.omim.org/entry/215400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"parathyroid gland","ntpm":2.4},{"tissue":"pituitary gland","ntpm":1.2}],"url":"https://www.proteinatlas.org/search/TBXT"},"hgnc":{"alias_symbol":[],"prev_symbol":["T"]},"alphafold":{"accession":"O15178","domains":[{"cath_id":"2.60.40.820","chopping":"18-217","consensus_level":"high","plddt":88.5514,"start":18,"end":217}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15178","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15178-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15178-F1-predicted_aligned_error_v6.png","plddt_mean":64.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TBXT","jax_strain_url":"https://www.jax.org/strain/search?query=TBXT"},"sequence":{"accession":"O15178","fasta_url":"https://rest.uniprot.org/uniprotkb/O15178.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15178/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15178"}},"corpus_meta":[{"pmid":"3043226","id":"PMC_3043226","title":"T-cell antigen receptor genes and T-cell 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markers in the skull base chordoma vs chondrosarcoma differential: a tissue microarray-based comparative analysis.","date":"2008","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/18820665","citation_count":129,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26015544","id":"PMC_26015544","title":"Brachyury and SMAD signalling collaboratively orchestrate distinct mesoderm and endoderm gene regulatory networks in differentiating human embryonic stem cells.","date":"2015","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/26015544","citation_count":123,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35140242","id":"PMC_35140242","title":"Human transcription factor protein interaction networks.","date":"2022","source":"Nature 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Carcinomas, and Rare in Other Carcinomas and Sarcomas: An Immunohistochemical Study of 5229 Cases.","date":"2015","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26099010","citation_count":105,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23064415","id":"PMC_23064415","title":"A common single-nucleotide variant in T is strongly associated with chordoma.","date":"2012","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23064415","citation_count":99,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20670140","id":"PMC_20670140","title":"Revisiting chordoma with brachyury, a \"new age\" marker: analysis of a validation study on 51 cases.","date":"2010","source":"Archives of pathology & laboratory medicine","url":"https://pubmed.ncbi.nlm.nih.gov/20670140","citation_count":82,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10332959","id":"PMC_10332959","title":"Analysis of select folate pathway genes, PAX3, and human T in a Midwestern neural tube defect population.","date":"1999","source":"Teratology","url":"https://pubmed.ncbi.nlm.nih.gov/10332959","citation_count":78,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22847733","id":"PMC_22847733","title":"An integrated functional genomics approach identifies the regulatory network directed by brachyury (T) in chordoma.","date":"2012","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/22847733","citation_count":75,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"38418917","id":"PMC_38418917","title":"On the genetic basis of tail-loss evolution in humans and apes.","date":"2024","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/38418917","citation_count":72,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21220197","id":"PMC_21220197","title":"Brachyury expression predicts poor prognosis at early stages of colorectal cancer.","date":"2011","source":"European journal of cancer (Oxford, England : 1990)","url":"https://pubmed.ncbi.nlm.nih.gov/21220197","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22538805","id":"PMC_22538805","title":"Genome-wide association identifies the T gene as a novel asthma pharmacogenetic locus.","date":"2012","source":"American journal of respiratory and critical care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22538805","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23788039","id":"PMC_23788039","title":"The embryonic transcription factor Brachyury blocks cell cycle progression and mediates tumor resistance to conventional antitumor therapies.","date":"2013","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/23788039","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24445144","id":"PMC_24445144","title":"The FGFR/MEK/ERK/brachyury pathway is critical for chordoma cell growth and survival.","date":"2014","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/24445144","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25009296","id":"PMC_25009296","title":"T-box transcription factor brachyury is associated with prostate cancer progression and aggressiveness.","date":"2014","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/25009296","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8963900","id":"PMC_8963900","title":"The human homolog T of the mouse T(Brachyury) gene; gene structure, cDNA sequence, and assignment to chromosome 6q27.","date":"1996","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/8963900","citation_count":67,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":39309,"output_tokens":1561,"usd":0.070671},"stage2":{"model":"claude-opus-4-6","input_tokens":4795,"output_tokens":1648,"usd":0.097763},"total_usd":0.463914,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":52992,"output_tokens":5022,"usd":0.117153},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7822,"output_tokens":3191,"usd":0.178327}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Brachyury (TBXT) is expressed in presumptive mesoderm, posterior mesoderm, and the notochord in amphioxus and vertebrates, with conserved spatiotemporal patterns suggesting an ancient role in notochord differentiation that predates roles in mesoderm formation; two amphioxus TBXT paralogues arose from a recent gene duplication, indicating the ancestral genome had a single copy.\",\n      \"method\": \"cDNA cloning, in situ hybridization, comparative developmental expression analysis across chordate subphyla\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct expression and cloning across multiple species with functional inference, single study\",\n      \"pmids\": [\"8575328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"T-box proteins (including TBXT/Brachyury) function as transcription factors that regulate downstream effector genes; specificity of different T-box family members is conferred by distinct target gene recognition sequences.\",\n      \"method\": \"Review of genetic epistasis, reporter assays, and target gene identification experiments\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple functional experiments across the field; transcription factor activity established by direct assay\",\n      \"pmids\": [\"11148447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TBXT (Brachyury) protein was localized by immunohistochemistry to the primitive streak and its derivatives, nascent embryonic mesoderm, node and notochord, notochord-associated endoderm, posterior neurectoderm, allantois (midline domain from ~7.5 to ~8.5 dpc), the developing heart, visceral endoderm, extraembryonic ectoderm, and chorionic ectoderm during mouse gastrulation, demonstrating highly dynamic spatiotemporal expression patterns across both embryonic and extraembryonic tissues.\",\n      \"method\": \"Sectional immunohistochemistry with anti-T antibody in staged mouse embryos\",\n      \"journal\": \"Gene expression patterns : GEP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization by IHC across multiple developmental stages; single lab study\",\n      \"pmids\": [\"16545989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A missense mutation in TBXT exon 2 (c.334G>T, p.G112W) within the T-box domain, completely linked with a synonymous variant (c.333G>C), is associated with the tailless phenotype in fat-rumped sheep in a recessive manner, demonstrating that the glycine-112 residue in the T-box domain of brachyury is functionally important for tail development.\",\n      \"method\": \"Direct sequencing of TBXT exon 2 in 301 individuals from 13 sheep breeds; genotyping of 380 samples; crossbreeding experiments\",\n      \"journal\": \"Animal genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutation identified and confirmed by crossbreeding; single study but large cohort with genetic validation\",\n      \"pmids\": [\"31475743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TBXT expression in chordoma cells is epigenetically regulated by histone H3K27 demethylases KDM6A (UTX) and KDM6B (JMJD3); pharmacologic or genetic (CRISPR/Cas9) inhibition of KDM6A/B increases repressive H3K27me3 marks at the TBXT locus, reduces TBXT protein levels, and causes chordoma cell death. Ectopic TBXT overexpression rescued viability, confirming TBXT as a direct target and functional effector of KDM6A/B activity.\",\n      \"method\": \"Pharmacologic inhibition with compound KDOBA67, CRISPR/Cas9 dual knockout of KDM6A/B, ChIP-seq for histone marks, Western blot for TBXT protein, ectopic overexpression rescue assay, primary patient-derived cultures\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including genetic KO, pharmacologic inhibition, ChIP-seq, and rescue by ectopic expression in one study\",\n      \"pmids\": [\"32855205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A de novo missense mutation in TBXT (c.G47T: p.R16L) identified in a congenital scoliosis patient compromised binding of TBXT to its target DNA sequence, reduced transcriptional activity, and exhibited a dominant-negative effect on wild-type TBXT.\",\n      \"method\": \"Whole exome sequencing, DNA-binding assay, transcriptional reporter assay, dominant-negative functional testing\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro functional assays (DNA binding + reporter) with mutagenesis; single study\",\n      \"pmids\": [\"32672867\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBXT (Brachyury) is a T-box transcription factor that binds specific DNA target sequences to regulate downstream effector genes controlling mesoderm formation and notochord differentiation during embryogenesis; its transcriptional activity requires intact T-box domain residues (e.g., G112 for tail development, R16 for DNA binding), its expression in notochordal-lineage cancer (chordoma) is epigenetically maintained by histone H3K27 demethylases KDM6A/B, and its ectopic or persistent expression acts as a functional oncogenic driver in chordoma.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper, then extract discoveries from KEEP papers only.\n\n**Classification:**\n\nPapers [1]-[13], [15], [17]-[32], [33]-[40], [41]-[44], [46]-[58], [59]-[64], [66]-[70], [71]-[82], [83]-[94], [96]-[100]: These are about T cells (immunology), T-SNAREs, T-antigens (SV40), Taenia, T-DNA (Agrobacterium), T-bet (TBX21), T-box genes TBX1/TBX2/TBX3/TBX6, or other unrelated topics → EXCLUDE (alias collisions or unrelated genes)\n\n**KEEP papers** (canonical TBXT/Brachyury protein):\n- [16] PMID:8575328 — Amphioxus Brachyury conservation\n- [42] PMID:16545989 — Localization of Brachyury (T) in mouse gastrulation\n- [24] PMID:11148447 — T-targets, T-box protein functions (review focusing on Brachyury targets)\n- [65] PMID:32855205 — KDM6A/B inhibition silences TBXT in chordoma\n- [85] PMID:31475743 — TBXT polymorphisms in tailless sheep\n- [95] PMID:32672867 — TBXT de novo mutation in congenital scoliosis\n\nGene2pubmed curated:\n- [5] PMID:21816365 — BRACHYURY and CDX2 in BMP-induced differentiation\n- [8] PMID:19801981 — T gene duplication in familial chordoma\n- [12] PMID:21171078 — Role of T (brachyury) in sporadic chordoma\n- [15] PMID:26015544 — Brachyury/SMAD signalling in hESC differentiation\n- [17] PMID:29026114 — Driver landscape of sporadic chordoma (somatic T duplications)\n- [18] PMID:22611028 — Brachyury as driver of EMT in lung tumors\n- [20] PMID:23064415 — SNP rs2305089 in T associated with chordoma\n- [23] PMID:22847733 — Integrated functional genomics of brachyury in chordoma\n- [24] PMID:38418917 — Alu insertion in TBXT intron, tail-loss evolution\n- [27] PMID:23788039 — Brachyury blocks cell cycle, binds p21 promoter\n- [28] PMID:24445144 — FGFR/MEK/ERK/brachyury pathway in chordoma\n- [30] PMID:8963900 — Human T gene structure, cDNA, chromosome 6q27\n\nAdditional KEEP from retrieved:\n- [10] PMID:14995914 — EXCLUDE (TCR trafficking)\n- [13] (T-box repressors TBX2/TBX3) PMID:12000749 — EXCLUDE (TBX2/TBX3, not TBXT)\n- [11] PMID:17273972 — EXCLUDE (TBX1)\n- [16] gene2pubmed PMID:35140242 — EXCLUDE (general TF networks)\n- [6] PMID:18593560 — About Mesp1, not TBXT → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Brachyury (T) orthologs were cloned from amphioxus, demonstrating conservation of the gene across all three chordate subphyla. Spatial and temporal expression studies showed Brachyury transcripts distributed throughout the notochord anteroposterior axis and in presumptive mesoderm, supporting ancient roles in notochord differentiation predating roles in mesoderm formation.\",\n      \"method\": \"cDNA cloning, in situ hybridization, phylogenetic analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — expression with functional inference across phyla, single study\",\n      \"pmids\": [\"8575328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human T gene was cloned and characterized: it encodes a transcription factor with 91% overall amino acid identity to mouse T protein and 100% identity across the 77-amino-acid T-box DNA-binding domain. Human T expression is confined to notochord-derived cells, and the gene maps to chromosome 6q27.\",\n      \"method\": \"cDNA cloning, genomic library screening, expression analysis, chromosomal mapping\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct sequencing and structural characterization, foundational study\",\n      \"pmids\": [\"8963900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"T-box proteins including Brachyury regulate downstream effector genes by binding T-box binding elements (T-sites) in target gene promoters; the specificity of individual T-box factors is determined by the precise sequence of the T-site and flanking nucleotides, enabling distinct transcriptional programs.\",\n      \"method\": \"Review integrating reporter assays, gel-shift assays, and mutagenesis from multiple studies\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — synthesis review; functional specificity supported by multiple cited experimental studies\",\n      \"pmids\": [\"11148447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Brachyury (T) protein was localized by immunohistochemistry to the primitive streak, nascent embryonic mesoderm, node, notochord, notochord-associated endoderm, posterior neurectoderm, and allantois midline during mouse gastrulation. Novel sites including the developing heart, visceral endoderm, extraembryonic ectoderm, and chorionic ectoderm were also identified, demonstrating broader spatiotemporal activity than previously appreciated.\",\n      \"method\": \"Sectional immunohistochemistry in mouse conceptus across gastrulation stages\",\n      \"journal\": \"Gene expression patterns : GEP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization by IHC across multiple tissues, single lab study\",\n      \"pmids\": [\"16545989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Germline duplication of the T (brachyury) gene locus on chromosome 6q27 was identified in four multiplex chordoma families with at least three affected members each. The duplicated region contained only the T gene, establishing T gene copy-number gain as a susceptibility mechanism for familial chordoma.\",\n      \"method\": \"High-resolution array-CGH on familial chordoma cases and controls\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated across four independent families with orthogonal genomic methods\",\n      \"pmids\": [\"19801981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chromosomal aberrations resulting in copy-number gain of the T locus are common in sporadic chordomas (~46% of cases including polysomy and amplification). Knockdown of T in chordoma cell line U-CH1 caused marked decrease in cell proliferation and morphological features of senescence, demonstrating that brachyury expression is critical for chordoma cell proliferation in vitro.\",\n      \"method\": \"FISH, qPCR, array-CGH, shRNA knockdown, xenograft validation in NOD/SCID mice\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genomic methods plus functional KD with defined phenotype, xenograft validation\",\n      \"pmids\": [\"21171078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BMP4 cooperates with FGF2/ERK signaling to induce mesoderm differentiation from human and mouse pluripotent stem cells via BRACHYURY (BRA). BRA was necessary for and preceded CDX2 expression; both genes were required for mesodermal and trophoblast-associated gene expression, establishing BRA as a key mediator of BMP-induced mesoderm specification rather than trophoblast lineage commitment.\",\n      \"method\": \"shRNA knockdown in hESCs, gene expression analysis, epistasis experiments with FGF/BMP signaling\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined lineage phenotypes, multiple orthogonal approaches in human and mouse cells\",\n      \"pmids\": [\"21816365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Using shRNA-mediated knockdown, ChIP-seq, and gene expression microarray in a chordoma cell line, brachyury was shown to act primarily as a transcriptional activator, binding 99 direct target genes via the T-box binding motif (identical to that in mouse, Xenopus, and zebrafish). Brachyury was identified as a master regulator of an oncogenic transcriptional network encompassing cell cycle components and extracellular matrix genes.\",\n      \"method\": \"shRNA knockdown, ChIP-seq, gene expression microarray, bioinformatics, validation in human chordoma samples\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq plus functional KD plus expression arrays, multiple orthogonal methods\",\n      \"pmids\": [\"22847733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A common nonsynonymous SNP in the T gene (rs2305089) was strongly associated with chordoma risk (OR=6.1, P=4.4×10⁻⁹) in a genome-wide association study replicated in an independent cohort, implicating variation in TBXT itself as a direct genetic risk factor for chordoma.\",\n      \"method\": \"GWAS with whole-exome and Sanger sequencing, replication cohort\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated genetic association with functional candidate SNP in coding sequence\",\n      \"pmids\": [\"23064415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Brachyury expression in human lung carcinoma cells correlates with resistance to chemotherapy and radiation. Chromatin immunoprecipitation and luciferase reporter assays demonstrated that Brachyury directly binds a half T-box consensus site in the CDKN1A (p21) gene promoter, repressing its expression, downregulating cyclin D1 and phosphorylated Rb, and thereby slowing cell cycle progression to confer therapeutic resistance.\",\n      \"method\": \"ChIP, luciferase reporter assays, in vitro cytotoxicity, in vivo xenograft chemotherapy experiments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP and promoter reporter assays establishing mechanism, supported by in vivo xenograft data\",\n      \"pmids\": [\"23788039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In chordoma cell lines, FGF2 activates the FGFR/MEK/ERK signaling cascade, which phosphorylates FRS2-α and promotes nuclear translocation of phospho-ERK, resulting in increased brachyury expression. Brachyury in turn maintains FGF2 secretion and FGFR/MEK/ERK phosphorylation, forming a positive feedback loop that promotes cell growth, survival, and epithelial-mesenchymal transition. Knockdown of brachyury disrupted this loop and induced apoptosis.\",\n      \"method\": \"Western blot, ELISA, immunofluorescence, selective kinase inhibitors, shRNA knockdown of brachyury\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacologic inhibitors plus genetic KD establishing pathway position with defined cellular phenotypes\",\n      \"pmids\": [\"24445144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Genome-wide ChIP-seq in differentiating hESCs revealed that Brachyury (BRA) has distinct binding landscapes in BMP4-induced mesoderm versus activin-A-induced endoderm progenitors. BRA physically interacts and collaborates with SMAD1 (in mesoderm) or SMAD2/3 (in endoderm) to regulate cell-specific target gene expression. Manipulation of BRA levels showed it is essential for mesoderm but not endoderm formation.\",\n      \"method\": \"ChIP-seq, co-immunoprecipitation, gene expression analysis, BRA level manipulation in hESCs\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq plus Co-IP establishing physical interaction with SMADs, plus epistasis demonstrating mesoderm-specific requirement\",\n      \"pmids\": [\"26015544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Somatic duplications of the brachyury (T) locus were identified in up to 27% of sporadic chordoma cases, with rearrangement architecture recapitulating the pathogenic germline duplications of familial chordoma. PI3K signaling mutations were found in 16% of cases, and LYST was recurrently inactivated in 10%.\",\n      \"method\": \"Whole-genome sequencing, copy-number analysis of 104 sporadic chordoma cases\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large-scale genomic study independently replicating T locus duplication as somatic driver\",\n      \"pmids\": [\"29026114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Two linked TBXT variants (missense c.334G>T causing p.Gly112Trp in the T-box domain, plus synonymous c.333G>C) were associated with the tailless phenotype in fat-rumped sheep. Crossbreeding showed the CT/CT genotype (recessive) causes tail shortening, indicating the Gly112Trp substitution in the T-box DNA-binding domain impairs TBXT function in tail development.\",\n      \"method\": \"Direct sequencing of exon 2 in 301 individuals from 13 breeds, genotyping of 380 samples, crossbreeding experiments\",\n      \"journal\": \"Animal genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic association plus crossbreeding epistasis; no in vitro functional assay of mutant protein\",\n      \"pmids\": [\"31475743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pharmacologic inhibition of H3K27 demethylases KDM6A (UTX) and KDM6B (JMJD3) with compound KDOBA67 caused genome-wide increase in repressive H3K27me3 at the TBXT locus with concomitant reduction of active marks (H3K27ac, H3K9ac, H3K4me3), leading to reduced TBXT protein levels and chordoma cell death. Ectopic overexpression of TBXT rescued viability, demonstrating that TBXT is a direct target of KDM6A/B-dependent epigenetic regulation and is required for chordoma cell survival.\",\n      \"method\": \"Pharmacologic KDM6A/B inhibition, CRISPR/Cas9 dual KO of KDM6A/B, ChIP-seq (H3K27me3, H3K27ac, H3K4me3), TBXT overexpression rescue, primary patient-derived cultures\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq epigenomic mapping plus genetic CRISPR KO plus rescue overexpression, multiple models including primary cells\",\n      \"pmids\": [\"32855205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A de novo missense mutation in TBXT (c.G47T; p.R16L) was identified by whole-exome sequencing in a congenital scoliosis patient. The R16L substitution compromised TBXT binding to its target DNA sequence, reduced transcriptional activity, and exhibited a dominant-negative effect on wild-type TBXT, establishing that TBXT transcriptional activity in the T-box domain is required for normal vertebral development.\",\n      \"method\": \"Whole-exome sequencing, DNA-binding assay, transcriptional activity reporter assay, dominant-negative functional analysis\",\n      \"journal\": \"Journal of orthopaedic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — direct functional assays of mutant protein DNA binding and transcriptional activity, single lab\",\n      \"pmids\": [\"32672867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A hominoid-specific Alu element insertion in an intron of TBXT pairs with an ancestral reverse-oriented Alu element to produce an alternative splicing event that skips an exon. Mouse models co-expressing full-length and exon-skipped Tbxt isoforms (mimicking hominoid TBXT expression) displayed complete tail loss or shortened tails depending on relative isoform abundance in the embryonic tail bud. Mice expressing only the exon-skipped isoform also developed neural tube defects, linking TBXT alternative splicing to both tail-loss evolution and neural tube defect risk.\",\n      \"method\": \"Transgenic mouse models with controlled Tbxt isoform expression, genetic epistasis, embryological phenotyping\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple transgenic mouse lines with dose-dependent isoform expression phenotypes, mechanistic link to alternative splicing established\",\n      \"pmids\": [\"38418917\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBXT (brachyury) encodes a T-box transcription factor that binds T-box DNA elements via its conserved T-box domain to activate target genes involved in mesoderm specification, notochord differentiation, and epithelial-mesenchymal transition; it physically collaborates with SMAD1 or SMAD2/3 in a context-dependent manner, is maintained in an active chromatin state by KDM6A/B-mediated H3K27 demethylation, directly represses CDKN1A (p21) to slow cell cycle progression, participates in a positive FGFR/MEK/ERK feedback loop in chordoma, and in hominoids undergoes Alu-element-mediated alternative splicing whose relative isoform balance governs tail development and neural tube closure.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TBXT (Brachyury) is a T-box transcription factor that binds specific DNA target sequences to regulate genes controlling mesoderm formation, notochord differentiation, and axial development [PMID:8575328, PMID:11148447]. During mouse gastrulation, TBXT protein is dynamically expressed in the primitive streak, nascent mesoderm, node, notochord, allantois, and several extraembryonic tissues [PMID:16545989]. Residues critical for its function include R16, required for DNA binding and transcriptional activity — its mutation causes congenital scoliosis with a dominant-negative effect on wild-type TBXT — and G112 within the T-box domain, whose substitution abolishes tail development in sheep [PMID:32672867, PMID:31475743]. In chordoma, TBXT expression is epigenetically maintained by histone H3K27 demethylases KDM6A and KDM6B, and TBXT itself acts as a functional oncogenic driver whose loss causes chordoma cell death [PMID:32855205].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Comparative expression analysis across chordate subphyla established that TBXT's ancestral role was notochord differentiation, with mesoderm patterning roles arising later in vertebrate evolution.\",\n      \"evidence\": \"cDNA cloning and in situ hybridization comparing amphioxus and vertebrate embryos\",\n      \"pmids\": [\"8575328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional validation by loss-of-function in amphioxus was not performed\",\n        \"Whether conserved expression domains reflect conserved regulatory elements was not tested\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Synthesis of genetic epistasis, reporter assays, and target gene studies established that T-box proteins including TBXT function as transcription factors with family-member-specific DNA target recognition.\",\n      \"evidence\": \"Review integrating reporter assays and target gene identification across multiple T-box family members\",\n      \"pmids\": [\"11148447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Genome-wide direct target identification for TBXT specifically was not available\",\n        \"Structural basis for target specificity among T-box family members was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Detailed protein-level mapping resolved TBXT's spatiotemporal distribution during gastrulation, revealing expression not only in expected domains (primitive streak, notochord) but also in extraembryonic tissues including visceral endoderm and chorionic ectoderm.\",\n      \"evidence\": \"Sectional immunohistochemistry with anti-T antibody in staged mouse embryos\",\n      \"pmids\": [\"16545989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional significance of TBXT in extraembryonic tissues was not addressed\",\n        \"Whether protein localization precisely mirrors mRNA distribution was not confirmed\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of the G112W missense mutation in the T-box domain as the cause of the tailless phenotype in fat-rumped sheep established that this residue is essential for TBXT's role in posterior axial extension.\",\n      \"evidence\": \"Direct sequencing and genotyping in 680+ sheep across 13 breeds with crossbreeding validation\",\n      \"pmids\": [\"31475743\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular mechanism by which G112W disrupts T-box domain function (e.g., DNA binding, protein folding) was not determined\",\n        \"No in vitro biochemical assay of the mutant protein was performed\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Parallel studies resolved two key aspects of TBXT biology: (1) the R16L mutation demonstrated that arginine-16 is required for DNA binding and that its disruption causes congenital scoliosis via a dominant-negative mechanism; (2) in chordoma, TBXT expression is maintained by KDM6A/B-mediated H3K27 demethylation, and TBXT itself is the critical survival effector downstream of these demethylases.\",\n      \"evidence\": \"WES with in vitro DNA-binding and reporter assays for R16L; CRISPR KO of KDM6A/B, ChIP-seq, pharmacologic inhibition, and ectopic TBXT rescue in chordoma cells and patient-derived cultures\",\n      \"pmids\": [\"32672867\", \"32855205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Genome-wide identification of direct TBXT transcriptional targets in chordoma has not been performed\",\n        \"Whether the dominant-negative mechanism of R16L operates in vivo remains untested\",\n        \"Structural basis for how R16L disrupts DNA binding is not resolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The genome-wide direct transcriptional targets of TBXT in both developmental and oncogenic contexts, the structural basis for disease-causing mutations, and the mechanism by which TBXT sustains chordoma cell survival remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No ChIP-seq or CUT&RUN target map for TBXT in embryonic mesoderm or notochord\",\n        \"No high-resolution structure of full-length TBXT bound to DNA\",\n        \"Downstream effectors mediating TBXT-dependent chordoma cell survival are unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"KDM6A\",\n      \"KDM6B\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TBXT (brachyury) is a deeply conserved T-box transcription factor that serves as a master regulator of mesoderm specification, notochord differentiation, and axial elongation across chordates. It binds T-box DNA elements in target gene promoters primarily as a transcriptional activator, partnering context-dependently with SMAD1 during BMP4-driven mesoderm induction or with SMAD2/3 during activin-A-driven endoderm patterning, and directly represses CDKN1A (p21) to slow cell-cycle progression [PMID:26015544, PMID:22847733, PMID:23788039]. TBXT expression is maintained by KDM6A/B-mediated H3K27 demethylation and participates in a positive FGFR/MEK/ERK feedback loop; germline duplication or common coding variants at the TBXT locus confer susceptibility to chordoma, while loss-of-function mutations cause congenital vertebral malformations [PMID:32855205, PMID:24445144, PMID:19801981, PMID:32672867]. In hominoids, an Alu-element-mediated alternative splicing event produces an exon-skipped isoform whose relative abundance governs tail loss and modulates neural tube closure risk [PMID:38418917].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Cloning of amphioxus brachyury established that the gene is conserved across all three chordate subphyla and suggested that its ancestral role in notochord differentiation predates its functions in mesoderm formation.\",\n      \"evidence\": \"cDNA cloning, in situ hybridization, and phylogenetic analysis in amphioxus\",\n      \"pmids\": [\"8575328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional conservation inferred from expression only; no loss-of-function data in amphioxus\", \"Regulatory elements driving notochord versus mesoderm expression not dissected\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Cloning of the human T gene revealed near-complete identity of the T-box DNA-binding domain with mouse T and restricted expression to notochord-derived cells, establishing the molecular foundation for studying TBXT function in humans.\",\n      \"evidence\": \"cDNA cloning, genomic library screening, expression analysis, chromosomal mapping to 6q27\",\n      \"pmids\": [\"8963900\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream transcriptional targets in human cells unknown\", \"No functional assay of human T protein activity\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Synthesis of promoter-binding studies clarified that T-box proteins including brachyury achieve target gene specificity through sequence-specific recognition of T-box binding elements, with flanking nucleotide context governing individual factor selectivity.\",\n      \"evidence\": \"Review integrating gel-shift assays, reporter assays, and mutagenesis from multiple labs\",\n      \"pmids\": [\"11148447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genome-wide binding landscape not yet mapped\", \"No structural explanation for flanking-sequence discrimination\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of germline TBXT locus duplications in four multiplex chordoma families established copy-number gain of this single gene as a heritable susceptibility mechanism for familial chordoma, directly linking TBXT dosage to tumorigenesis.\",\n      \"evidence\": \"High-resolution array-CGH in familial chordoma kindreds and controls\",\n      \"pmids\": [\"19801981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which extra TBXT copies drive transformation not defined\", \"Penetrance and modifier loci uncharacterized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Functional knockdown of TBXT in chordoma cells demonstrated that its expression is essential for chordoma proliferation, and genomic analyses revealed somatic copy-number gain in nearly half of sporadic chordomas, confirming TBXT as a bona fide oncogenic driver in this tumor type.\",\n      \"evidence\": \"FISH, qPCR, array-CGH, shRNA knockdown in U-CH1, xenograft validation\",\n      \"pmids\": [\"21171078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating the proliferative requirement not identified at this stage\", \"Whether TBXT knockdown effect is cytostatic versus apoptotic not fully resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Epistasis experiments in human ESCs resolved a long-standing question about BMP4-induced cell fate by showing that TBXT is required for and precedes CDX2 expression during mesoderm specification, placing it upstream in the BMP4/FGF2-to-mesoderm differentiation cascade.\",\n      \"evidence\": \"shRNA knockdown in hESCs, gene expression analysis, epistasis with FGF/BMP signaling\",\n      \"pmids\": [\"21816365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect regulation of CDX2 by TBXT not distinguished\", \"Mechanism of FGF2 cooperation with BMP4 at the TBXT locus not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"ChIP-seq in chordoma cells revealed that TBXT acts predominantly as a transcriptional activator, directly binding 99 target genes through the conserved T-box motif and orchestrating an oncogenic network encompassing cell-cycle and extracellular matrix genes; concurrently, a GWAS identified a coding SNP (rs2305089) as a strong chordoma risk allele.\",\n      \"evidence\": \"ChIP-seq, shRNA knockdown, expression microarray in chordoma; GWAS with replication cohort\",\n      \"pmids\": [\"22847733\", \"23064415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the risk SNP alters TBXT protein function or expression not mechanistically resolved\", \"Whether the 99 direct targets are universal or chordoma-specific unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Direct ChIP and reporter assays demonstrated that TBXT represses CDKN1A (p21) by binding a half T-box site in its promoter, thereby slowing cell-cycle progression and conferring resistance to chemotherapy and radiation—revealing a specific mechanism for TBXT-driven therapeutic resistance.\",\n      \"evidence\": \"ChIP, luciferase reporter assays, in vitro cytotoxicity, in vivo xenograft chemotherapy in lung carcinoma cells\",\n      \"pmids\": [\"23788039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p21 repression is the sole or primary mediator of therapeutic resistance not established\", \"Applicability of this mechanism to chordoma versus other TBXT-expressing tumors not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"A positive feedback loop was delineated in which FGF2 activates FGFR/MEK/ERK to upregulate TBXT, and TBXT in turn maintains FGF2 secretion and pathway phosphorylation, promoting chordoma growth, survival, and EMT.\",\n      \"evidence\": \"Western blot, ELISA, selective kinase inhibitors, shRNA knockdown in chordoma cells\",\n      \"pmids\": [\"24445144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TBXT directly transcribes FGF2 or acts indirectly not resolved\", \"Contribution of other RTK pathways to the feedback loop not assessed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Genome-wide binding analysis in differentiating hESCs showed that TBXT occupies distinct chromatin landscapes depending on signaling context, physically interacting with SMAD1 in BMP4-induced mesoderm and with SMAD2/3 in activin-A-induced endoderm, establishing context-dependent cofactor usage as the basis for lineage-specific transcriptional programs.\",\n      \"evidence\": \"ChIP-seq, co-immunoprecipitation, BRA-level manipulation in hESCs\",\n      \"pmids\": [\"26015544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for selective SMAD1 versus SMAD2/3 interaction unknown\", \"Whether additional cofactors participate in each complex not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Pharmacologic and genetic ablation of KDM6A/B demethylases increased H3K27me3 at the TBXT locus, silencing its expression and killing chordoma cells—an effect rescued by ectopic TBXT—thereby identifying KDM6A/B-mediated epigenetic maintenance as essential for TBXT transcription in chordoma, and a de novo TBXT missense mutation (R16L) in a congenital scoliosis patient was shown to impair DNA binding and act dominant-negatively, linking TBXT loss-of-function to vertebral malformation.\",\n      \"evidence\": \"KDM6A/B inhibitor + CRISPR KO + ChIP-seq + rescue overexpression in chordoma; WES + DNA-binding and reporter assays for R16L variant\",\n      \"pmids\": [\"32855205\", \"32672867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KDM6A versus KDM6B has non-redundant roles at the TBXT locus not fully resolved\", \"R16L finding from a single patient; population-level confirmation of congenital scoliosis link pending\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A hominoid-specific Alu-element insertion was shown to generate an exon-skipped TBXT isoform whose co-expression with full-length TBXT in transgenic mice phenocopied tail loss in a dose-dependent manner, directly explaining hominoid tail-loss evolution; expression of the exon-skipped isoform alone also caused neural tube defects, revealing a pleiotropic consequence of the same splicing event.\",\n      \"evidence\": \"Multiple transgenic mouse lines with controlled Tbxt isoform expression, genetic epistasis, embryological phenotyping\",\n      \"pmids\": [\"38418917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which the truncated isoform interferes with full-length TBXT function not defined\", \"Whether neural tube defect risk in humans is modulated by quantitative isoform balance remains untested\", \"No structural data on the exon-skipped protein product\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for context-dependent SMAD cofactor selection, whether the exon-skipped isoform acts as a dominant-negative or has independent activity, and the full catalog of direct transcriptional targets during normal human embryogenesis versus oncogenesis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of TBXT in complex with SMAD partners\", \"Genome-wide target maps in normal human gastrulation tissue lacking\", \"Therapeutic window for TBXT inhibition in chordoma versus developmental toxicity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 2, 7, 9, 15]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 7, 9, 11, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 10, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 6, 11, 16]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 7, 9, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 10, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [4, 5, 8, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SMAD1\",\n      \"SMAD2\",\n      \"SMAD3\",\n      \"KDM6A\",\n      \"KDM6B\",\n      \"CDX2\",\n      \"FGFR1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}