{"gene":"CDX4","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2003,"finding":"cdx4 (kugelig locus in zebrafish) regulates hox gene expression and is required for specification of haematopoietic cell fate; haematopoietic defects in cdx4 mutants are rescued by overexpression of hoxb7a or hoxa9a (but not hoxb8a), placing cdx4 upstream of specific hox genes in blood progenitor specification. cdx4 overexpression in mouse embryonic stem cells induces blood formation and alters hox gene expression.","method":"Zebrafish forward genetics (kugelig mutant), rescue by hox gene overexpression, mESC overexpression assay, genetic epistasis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with rescue experiments, replicated across zebrafish and mESC systems, multiple orthogonal approaches in one study","pmids":["13679919"],"is_preprint":false},{"year":1993,"finding":"Murine Cdx-4 protein and mRNA are expressed in a posterior-to-anterior gradient during gastrulation (7.0–10 d.p.c.), localized to allantois, primitive streak, neurectoderm, presomitic and lateral plate mesoderm, and hindgut endoderm, suggesting a role in anteroposterior axial specification.","method":"In situ hybridization and immunohistochemistry in mouse embryos","journal":"Mechanisms of development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by two orthogonal methods (ISH + IHC), single lab, no functional manipulation","pmids":["7902125"],"is_preprint":false},{"year":2005,"finding":"Cdx4 is a direct transcriptional target of the canonical Wnt pathway; LEF1 and β-catenin bind the Cdx4 promoter at multiple LEF/TCF response elements in embryocarcinoma cells and in the embryonic tailbud, and Cdx4 expression is reduced in Wnt3a-null embryos.","method":"Chromatin immunoprecipitation (ChIP), promoter-reporter transfection assays, Wnt3a-null mouse embryos, Wnt inhibitor treatment ex vivo","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP in two contexts (cell line and embryo), promoter mutagenesis, loss-of-function genetic model, multiple orthogonal methods in one study","pmids":["16309666"],"is_preprint":false},{"year":2005,"finding":"cdx4 and cdx2 protein gradients form along the neural and mesodermal tissues by decay of protein activity as cells move away from the regressing tailbud; an intronic enhancer element of cdx4 is required for correct spatial transgene expression.","method":"lacZ reporter transgenic mice, in situ hybridization","journal":"The International journal of developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transgenic reporter assay showing gradient formation and identifying essential intronic enhancer, single lab","pmids":["16281167"],"is_preprint":false},{"year":2006,"finding":"Cdx4 combined with Cdx2 is required for chorio-allantoic fusion and development of the placental labyrinth; in Cdx2/Cdx4 compound mutants, the allantoic vascular network fails to extend into chorionic ectoderm, revealing a redundant role for Cdx4 in placental morphogenesis.","method":"Targeted mouse knockout, compound mutant analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined cellular and morphological phenotype, compound mutant epistasis, peer-reviewed","pmids":["16396910"],"is_preprint":false},{"year":2006,"finding":"Cdx4 and the transcriptional coregulator menin both bind the same regulatory region of the Hoxa9 locus in hematopoietic cells and co-activate Hoxa9 transcription; ablation of menin abolishes Cdx4 access to chromatin and reduces histone H3K4 trimethylation at the Hoxa9 locus.","method":"Chromatin immunoprecipitation (ChIP), reporter co-activation assays, menin knockdown","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP demonstrating co-occupancy, functional reporter assay, loss-of-function showing chromatin consequences, single lab with multiple orthogonal methods","pmids":["17183676"],"is_preprint":false},{"year":2008,"finding":"cdx4 functions cell-autonomously within the endoderm to localize foregut organs (pancreas, liver, small intestine) along the anterior-posterior axis; endoderm-specific cdx4 knockdown recapitulates posteriorly shifted pancreas, and endoderm-specific overexpression shifts the pancreas anteriorly. Cdx4 may block pancreatic identity by suppressing retinoic acid signaling in posterior endoderm.","method":"Morpholino knockdown and tissue-specific overexpression in zebrafish, cdx4 mutant analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific gain- and loss-of-function with defined cellular phenotype, zebrafish mutant corroboration, single lab","pmids":["18234725"],"is_preprint":false},{"year":2010,"finding":"Cdx2 directly binds Cdx response elements in the Cdx4 promoter and activates its transcription; Cdx4 expression is significantly reduced in Cdx2-null mouse embryos; Cdx2 and canonical Wnt signaling regulate Cdx4 through distinct mechanisms.","method":"EMSA, ChIP in embryos, promoter-reporter transfection, Cdx2 knockout mouse","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA showing direct binding, ChIP in vivo, promoter mutagenesis, genetic model, multiple orthogonal methods","pmids":["20933081"],"is_preprint":false},{"year":2010,"finding":"Loss of Cdx4 in mice has minimal effect on adult steady-state hematopoiesis (no significant change in HSC frequency or long-term repopulating activity), but Cdx4 deletion significantly delays MLL-AF9-induced acute myeloid leukemia, indicating Cdx4 participates in leukemogenesis downstream of this oncogene.","method":"Germline and conditional Cdx4 knockout in mice, competitive transplantation, retroviral MLL-AF9 bone marrow transplant model","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with defined hematopoietic phenotype, competitive transplant, leukemia model, multiple experimental approaches, single lab","pmids":["20494928"],"is_preprint":false},{"year":2011,"finding":"HoxA10 directly activates CDX4 transcription by binding a cis element in the CDX4 promoter; Cdx4 in turn directly activates HOXA10 transcription by binding a cis element in the HOXA10 promoter; this bidirectional positive feedback loop amplifies Hox-Cdx activity in myeloid progenitors and is relevant to AML pathogenesis.","method":"Promoter-reporter assays, site-directed mutagenesis of cis elements, gene knockdown, ChIP","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — promoter-reporter with cis-element mutagenesis, ChIP, reciprocal regulation demonstrated, single lab","pmids":["21471217"],"is_preprint":false},{"year":2011,"finding":"Tcf3 represses cdx4 expression by directly binding multiple sites in the cdx4 regulatory region in association with corepressors Groucho/TLE and HDAC1; the transcription factor E4f1 de-represses cdx4 by dissociating corepressors from Tcf3 without displacing Tcf3 from DNA; the E3 ubiquitin ligase Lnx2b (acting as a scaffold) counteracts E4f1.","method":"Zebrafish embryo genetics, mammalian cell reporter assays, ChIP, protein interaction assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (ChIP, reporter assays, zebrafish genetics, protein interaction), mechanistically dissected, single lab","pmids":["21666599"],"is_preprint":false},{"year":2012,"finding":"β-catenin directly activates both CDX4 and HOXA10 transcription in myeloid progenitor cells through novel cis elements in their promoters; HoxA10-induced CDX4 transcription is augmented by FGF2-dependent β-catenin activation, creating a positive feedback circuit.","method":"ChIP demonstrating β-catenin occupancy at CDX4 and HOXA10 promoters, promoter-reporter assays, FGF2 manipulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assays, single lab, mechanistically links β-catenin directly to CDX4 transcription","pmids":["23038246"],"is_preprint":false},{"year":2013,"finding":"ChIP-seq identified Sall4 as a direct Cdx4 transcriptional target in zebrafish; Sall4 in turn binds the cdx4 locus (auto- and cross-regulation); Cdx4 and Sall4 co-regulate hematopoietic initiation genes (hox, scl, lmo2); combined cdx4/sall4 knockdown impairs erythropoiesis, and overexpression of scl + lmo2 together rescues the erythroid program.","method":"ChIP-seq, gene-expression profiling, morpholino knockdown, overexpression rescue in zebrafish","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq, expression profiling, epistatic rescue experiments, multiple orthogonal approaches","pmids":["24286030"],"is_preprint":false},{"year":2014,"finding":"HoxA9 represses CDX4 transcription in differentiating myeloid cells, antagonizing HoxA10 activation; tyrosine phosphorylation of HoxA10 impairs its activation of CDX4, while tyrosine phosphorylation of HoxA9 facilitates repression; constitutively active Shp2 blocks cytokine-induced phosphorylation of both, sustaining elevated CDX4 expression; Mll-Ell oncogene induces HoxA10-dependent CDX4 increase.","method":"Promoter-reporter assays, site-specific phosphorylation mutagenesis, Shp2 gain-of-function, ChIP, retroviral expression in myeloid progenitors","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple approaches (reporter, mutagenesis, ChIP), single lab, mechanistically dissects phosphorylation-dependent CDX4 regulation","pmids":["25531430"],"is_preprint":false},{"year":2015,"finding":"Cdx4 regulates the spatiotemporal activation of hox genes in zebrafish in a paralogous-group-dependent manner: loss of Cdx4 delays transcriptional initiation of group 5–10 hox genes in trunk neural tissue and trunk mesoderm, and prevents extension of group 11–13 hox expression beyond the tail bud. The primary effect is on the timing (initiation phase) of hox transcriptional activation.","method":"Cdx4 morpholino knockdown in zebrafish, spatial expression profiling of all 49 zebrafish hox genes by ISH","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic loss-of-function with comprehensive spatiotemporal readout across all hox paralog groups, single lab","pmids":["26335559"],"is_preprint":false},{"year":2016,"finding":"Cdx4 suppresses expression of the RA-degrading enzyme Cyp26a1 in the presumptive spinal cord domain, thereby preventing RA degradation and maintaining spinal cord identity; conversely, RA signaling inhibits cdx4 expansion in the hindbrain. This mutual antagonism between Cdx4 and Cyp26a1/RA positions the hindbrain-spinal cord boundary.","method":"Chemical inhibitors of RA signaling, morpholino knockdown of Cdx4, expression analysis in zebrafish","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with chemical and morpholino tools, defined molecular target (Cyp26a1), single lab","pmids":["26773000"],"is_preprint":false},{"year":2017,"finding":"CDX4 expression is restricted to definitive hematopoietic KDR+CD235a- mesoderm in a WNT- and FGF-dependent manner in human pluripotent stem cell differentiation; exogenous CDX4 during mesoderm specification represses primitive hematopoietic potential and confers fivefold greater definitive hematopoietic potential; CDX4 knockout hPSCs retain primitive hematopoiesis but show fivefold decreased multilineage definitive hematopoietic potential.","method":"hPSC differentiation, lentiviral CDX4 overexpression, CRISPR knockout, transcriptome analysis, flow cytometry","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — both gain- and loss-of-function in human cells with defined hematopoietic lineage readouts, multiple orthogonal approaches, single lab","pmids":["28408465"],"is_preprint":false},{"year":2019,"finding":"CDX4 functions as a dual-function transcription factor in the spinal cord: it represses the early neural differentiation marker Nkx1.2 and promotes the late neural differentiation marker Pax6, while also preventing premature Pax6-dependent neural differentiation by blocking Ngn2 activation; RA signaling restricts this CDX4-over-Pax6 regulation to the rostral pre-neural tube.","method":"Gain- and loss-of-function experiments in chicken pre-neural tube, gene expression analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — both GOF and LOF with defined molecular targets, in vivo avian model, single lab","pmids":["30825428"],"is_preprint":false},{"year":2019,"finding":"Aberrant Cdx4 expression in mice induces transplantable acute erythroid leukemia, associated with upregulation of stemness/leukemogenesis genes and downregulation of Gata1/Gata2 erythroid differentiation targets; Cdx4 induces a proteomic profile overlapping with primitive human erythroid progenitors; whole-exome sequencing of leukemic mice identified recurrent co-occurring mutations in erythroid transcription factors and TP53 targets.","method":"Retroviral Cdx4 overexpression in mice, bone marrow transplantation, gene expression profiling, proteomics, whole-exome sequencing","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo leukemia induction with transplantability, multi-omic characterization, single lab","pmids":["31770439"],"is_preprint":false},{"year":2021,"finding":"Zebrafish cdx4 is expressed in trunk neural crest (NC) cell progenitors, directly binds NC cell-specific enhancers in the NC gene regulatory network, and regulates foxd3 expression in the posterior body; cdx4 mutants show disrupted segmental trunk NC migration (loss of leader/follower dynamics); cell transplantation showed Cdx4 acts tissue-autonomously within NC cells, not in adjacent paraxial mesoderm.","method":"cdx4 mutant analysis, ChIP (direct enhancer binding), morpholino knockdown, cell transplantation chimeras, live imaging in zebrafish","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP for direct enhancer binding, genetic mutant, cell-autonomous test by transplantation, multiple orthogonal methods, single lab","pmids":["34389276"],"is_preprint":false},{"year":2022,"finding":"CDX4+ mesoderm in hPSC differentiation is uniquely enriched for CD1d surface expression; CD1d+ mesoderm harbors CD34+HOXA+ hemogenic endothelium with multilineage erythroid-myeloid-lymphoid potential; scRNAseq shows CDX4hi cells are enriched in CD1d+ fraction, providing a surface marker for CDX4+ definitive hemogenic mesoderm.","method":"scRNAseq, flow cytometry, hPSC differentiation, functional hematopoietic assays","journal":"Stem cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — scRNAseq plus flow cytometry plus functional assays, single lab, identifies CDX4+ cell identity","pmids":["35569347"],"is_preprint":false},{"year":2005,"finding":"A consensus Oct1 (POU-domain octamer-binding protein) binding site in the proximal Cdx4 promoter is required for its activity; Oct1 co-expression induces Cdx4 reporter expression and mutation of the octamer site abolishes promoter activity; this octamer site is conserved in Cdx4 promoters across human, mouse, chicken, and zebrafish.","method":"Deletion analysis of Xenopus Cdx4 promoter, transgenic GFP reporter in Xenopus, promoter-reporter co-expression assay, site-directed mutagenesis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — promoter mutagenesis plus co-expression assay plus transgenic reporter, single lab, evolutionary conservation supports relevance","pmids":["15950614"],"is_preprint":false}],"current_model":"CDX4 is a homeodomain transcription factor that acts downstream of canonical Wnt (and FGF) signaling—with LEF1/β-catenin directly binding its promoter—and is itself transcriptionally regulated by Cdx2, HoxA9/HoxA10, Oct1, and Tcf3 (via Groucho/HDAC1 corepressors relieved by E4f1); CDX4 in turn directly binds and activates hox gene loci (in cooperation with menin-dependent H3K4 trimethylation), participates in a positive feedback loop with HoxA10, and specifies posterior mesoderm competence for definitive hematopoiesis, endodermal organ positioning, placental labyrinth development, neural crest migration (by binding NC-specific enhancers and regulating foxd3), and spinal cord neural progenitor maturation (by repressing Nkx1.2 and gating Pax6/Ngn2 activation), while aberrant CDX4 expression drives acute erythroid leukemia by blocking Gata1/Gata2-dependent erythroid differentiation."},"narrative":{"mechanistic_narrative":"CDX4 is a homeodomain transcription factor that reads out posterior positional information along the anteroposterior axis and translates it into hox-gene activation programs governing mesoderm, endoderm, and neural fate [PMID:13679919, PMID:26335559]. It is expressed in a posterior-to-anterior gradient during gastrulation [PMID:7902125] and is positioned as a direct transcriptional output of canonical Wnt signaling, with LEF1/β-catenin binding LEF/TCF response elements in its promoter and its expression lost in Wnt3a-null embryos [PMID:16309666]; Cdx2 (via Cdx response elements), Oct1, and HoxA10 likewise directly activate the CDX4 promoter, while Tcf3 represses it through Groucho/TLE–HDAC1 corepressors that E4f1 relieves [PMID:20933081, PMID:15950614, PMID:21471217, PMID:21666599]. As an effector, CDX4 directly binds and activates hox loci—co-occupying the Hoxa9 regulatory region with menin, whose loss abolishes Cdx4 chromatin access and H3K4 trimethylation [PMID:17183676]—and controls the timing of group 5–13 hox transcriptional initiation [PMID:26335559]. Through these targets CDX4 specifies posterior mesoderm competence for definitive hematopoiesis: it drives blood formation and restricts primitive in favor of definitive hematopoietic potential in zebrafish, mouse, and human pluripotent stem cell systems, partly via the co-regulator Sall4 and the scl/lmo2 erythroid program [PMID:13679919, PMID:24286030, PMID:28408465]. Cdx4 also acts cell-autonomously to position foregut organs in the endoderm by antagonizing retinoic acid signaling [PMID:18234725], contributes redundantly with Cdx2 to placental labyrinth development [PMID:16396910], guides trunk neural crest migration by binding neural-crest enhancers and regulating foxd3 [PMID:34389276], and gates spinal cord neural progenitor maturation by repressing Nkx1.2 and tuning Pax6/Ngn2 activation [PMID:30825428]. In hematopoietic malignancy, aberrant Cdx4 expression induces transplantable acute erythroid leukemia by blocking Gata1/Gata2-dependent differentiation [PMID:31770439], and Cdx4 participates in MLL-AF9-driven leukemogenesis through a HoxA10-CDX4 positive feedback circuit [PMID:20494928, PMID:21471217].","teleology":[{"year":1993,"claim":"Established CDX4 as a candidate axial patterning regulator by showing its graded posterior expression coincides with tissues undergoing anteroposterior specification.","evidence":"In situ hybridization and immunohistochemistry across mouse gastrulation stages","pmids":["7902125"],"confidence":"Medium","gaps":["No functional perturbation","Mechanism of gradient formation not addressed","Direct targets unknown"]},{"year":2003,"claim":"Resolved where CDX4 sits in the hematopoietic specification hierarchy, placing it upstream of specific hox genes required for blood progenitor fate.","evidence":"Zebrafish kugelig mutant with hox-gene rescue and mESC overexpression","pmids":["13679919"],"confidence":"High","gaps":["Which hox targets are direct vs indirect not fully resolved","Does not address adult vs definitive hematopoiesis distinction","No biochemical demonstration of promoter binding"]},{"year":2005,"claim":"Defined the upstream signals and transcription factors driving CDX4, identifying canonical Wnt (LEF1/β-catenin) and Oct1 as direct promoter activators and an intronic enhancer required for graded expression.","evidence":"ChIP, promoter-reporter mutagenesis, Wnt3a-null embryos, transgenic reporters in mouse and Xenopus","pmids":["16309666","15950614","16281167"],"confidence":"High","gaps":["How multiple inputs are integrated at the promoter unclear","Gradient decay mechanism inferred from reporter, not biochemically defined"]},{"year":2006,"claim":"Demonstrated CDX4 acts as a chromatin-level hox activator and revealed redundant developmental roles, showing menin-dependent recruitment to Hoxa9 and a Cdx2/Cdx4 requirement for placental labyrinth formation.","evidence":"ChIP co-occupancy with menin knockdown; compound Cdx2/Cdx4 mouse knockouts","pmids":["17183676","16396910"],"confidence":"High","gaps":["Whether menin recruits Cdx4 or vice versa not resolved","Direct placental targets of Cdx4 unidentified"]},{"year":2008,"claim":"Showed CDX4 patterns endodermal organ position cell-autonomously, linking its posterior activity to retinoic acid antagonism.","evidence":"Tissue-specific morpholino knockdown and overexpression in zebrafish","pmids":["18234725"],"confidence":"High","gaps":["Direct endodermal transcriptional targets not defined","Mechanism of RA suppression at gene level unknown"]},{"year":2010,"claim":"Separated CDX4's roles in normal versus malignant hematopoiesis, showing it is dispensable for steady-state HSCs but required for MLL-AF9 leukemogenesis.","evidence":"Germline/conditional Cdx4 knockout mice, competitive transplant, MLL-AF9 model","pmids":["20494928"],"confidence":"High","gaps":["Mechanism by which Cdx4 supports MLL-AF9 leukemia not defined","Redundancy with other Cdx genes in adult blood not excluded"]},{"year":2010,"claim":"Identified Cdx2 as a direct transcriptional activator of Cdx4 operating through a mechanism distinct from Wnt input.","evidence":"EMSA, in vivo ChIP, promoter-reporter, Cdx2 knockout mouse","pmids":["20933081"],"confidence":"High","gaps":["How Cdx2 and Wnt inputs are combinatorially integrated unknown"]},{"year":2011,"claim":"Uncovered feedback and repressive control architecture, establishing a reciprocal HoxA10–CDX4 activating loop and a Tcf3/Groucho/HDAC1 repression module relieved by E4f1.","evidence":"Promoter-reporter cis-element mutagenesis, ChIP, knockdown, protein-interaction assays in myeloid cells and zebrafish","pmids":["21471217","21666599"],"confidence":"High","gaps":["Dynamics of switching between repressed and activated states in vivo unclear","Role of Lnx2b scaffold in physiological contexts limited"]},{"year":2012,"claim":"Connected FGF and β-catenin signaling directly to CDX4 in myeloid progenitors, reinforcing the HoxA10-CDX4 amplifying circuit.","evidence":"ChIP for β-catenin occupancy, promoter-reporter, FGF2 manipulation","pmids":["23038246"],"confidence":"Medium","gaps":["Single lab; physiological relevance to normal progenitors versus leukemia not separated","Quantitative contribution of FGF2 vs Wnt not parsed"]},{"year":2013,"claim":"Defined CDX4's downstream effector network for hematopoietic initiation, identifying Sall4 as a direct target in an auto/cross-regulatory loop co-regulating scl/lmo2.","evidence":"ChIP-seq, expression profiling, morpholino knockdown, scl+lmo2 rescue in zebrafish","pmids":["24286030"],"confidence":"High","gaps":["Genome-wide direct target set in mammalian cells not established","Hierarchy among Sall4, hox, scl/lmo2 incompletely ordered"]},{"year":2014,"claim":"Showed CDX4 expression is post-translationally tuned in myeloid differentiation, with HoxA9 repression antagonizing HoxA10 activation and tyrosine phosphorylation/Shp2 controlling the balance.","evidence":"Promoter-reporter, phosphorylation-site mutagenesis, Shp2 gain-of-function, ChIP in myeloid progenitors","pmids":["25531430"],"confidence":"Medium","gaps":["Single lab; in vivo relevance of phospho-switch not tested","Kinase upstream of HoxA9/A10 phosphorylation not identified"]},{"year":2015,"claim":"Clarified that CDX4 primarily controls the timing of hox transcriptional initiation in a paralog-group-dependent manner rather than steady-state levels.","evidence":"Cdx4 morpholino knockdown with comprehensive ISH profiling of all 49 zebrafish hox genes","pmids":["26335559"],"confidence":"Medium","gaps":["Direct binding to delayed hox loci not demonstrated genome-wide","Mechanism distinguishing paralog groups unknown"]},{"year":2016,"claim":"Defined a CDX4–Cyp26a1/RA mutual antagonism that positions the hindbrain–spinal cord boundary.","evidence":"RA chemical inhibitors and Cdx4 morpholino knockdown in zebrafish","pmids":["26773000"],"confidence":"Medium","gaps":["Direct vs indirect repression of Cyp26a1 not resolved","Single lab"]},{"year":2017,"claim":"Demonstrated in human cells that CDX4 acts as a switch favoring definitive over primitive hematopoiesis within WNT/FGF-dependent mesoderm.","evidence":"hPSC differentiation with lentiviral overexpression, CRISPR knockout, transcriptomics, flow cytometry","pmids":["28408465"],"confidence":"High","gaps":["Direct targets driving the primitive-to-definitive switch not defined","Whether effect is cell-autonomous within mesoderm not parsed"]},{"year":2019,"claim":"Established CDX4 as a dual-function regulator of spinal cord progenitor maturation, repressing Nkx1.2 while promoting Pax6 yet preventing premature Ngn2-driven differentiation.","evidence":"Gain- and loss-of-function in chicken pre-neural tube with target gene analysis","pmids":["30825428"],"confidence":"Medium","gaps":["Direct binding to Nkx1.2/Pax6/Ngn2 loci not shown","Single lab and single species"]},{"year":2019,"claim":"Identified aberrant CDX4 as a driver of acute erythroid leukemia, mechanistically through blockade of Gata1/Gata2 erythroid differentiation.","evidence":"Retroviral Cdx4 overexpression in mice, transplantation, expression/proteomic profiling, whole-exome sequencing","pmids":["31770439"],"confidence":"Medium","gaps":["Whether Cdx4 directly represses Gata targets not established","Cooperating mutations correlative, not functionally tested"]},{"year":2021,"claim":"Showed CDX4 acts cell-autonomously in trunk neural crest, binding NC-specific enhancers and regulating foxd3 to control segmental migration.","evidence":"Zebrafish mutant, ChIP enhancer binding, morpholino, transplantation chimeras, live imaging","pmids":["34389276"],"confidence":"High","gaps":["Full NC enhancer target set not mapped","How Cdx4 controls leader/follower dynamics mechanistically unclear"]},{"year":2022,"claim":"Provided a surface-marker handle (CD1d) for CDX4+ definitive hemogenic mesoderm, linking CDX4 identity to multilineage hematopoietic potential.","evidence":"scRNAseq, flow cytometry, functional hematopoietic assays in hPSC differentiation","pmids":["35569347"],"confidence":"Medium","gaps":["Whether CDX4 directly regulates CD1d unknown","Correlative cell-identity mapping, not mechanistic"]},{"year":null,"claim":"A genome-wide, mammalian direct-target map of CDX4 and a unified account of how a single graded transcription factor coordinates such distinct fates (blood, endoderm, neural crest, spinal cord) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of CDX4-DNA or CDX4-cofactor complexes","Direct target sets largely defined in zebrafish, not human","Context-specific cofactor logic distinguishing developmental vs leukemic outputs not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,9,12,14,17,19]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,9,12,19]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,5]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,4,6,16,17,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,9,12,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,18]}],"complexes":[],"partners":["MEN1","HOXA10","HOXA9","CTNNB1","LEF1","TCF3","SALL4","CDX2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14627","full_name":"Homeobox protein CDX-4","aliases":["Caudal-type homeobox protein 4"],"length_aa":284,"mass_kda":30.5,"function":"","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O14627/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDX4","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/CDX4","total_profiled":1310},"omim":[{"mim_id":"608964","title":"TATA BOX-BINDING PROTEIN-LIKE PROTEIN 2; TBPL2","url":"https://www.omim.org/entry/608964"},{"mim_id":"600297","title":"CAUDAL-TYPE HOMEOBOX TRANSCRIPTION FACTOR 2; CDX2","url":"https://www.omim.org/entry/600297"},{"mim_id":"300922","title":"CYSTEINE-RICH HYDROPHOBIC DOMAIN PROTEIN 1; CHIC1","url":"https://www.omim.org/entry/300922"},{"mim_id":"300026","title":"NUCLEOSOME ASSEMBLY PROTEIN 1-LIKE 2; NAP1L2","url":"https://www.omim.org/entry/300026"},{"mim_id":"300025","title":"CAUDAL-TYPE HOMEOBOX TRANSCRIPTION FACTOR 4; CDX4","url":"https://www.omim.org/entry/300025"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"skin 1","ntpm":1.0}],"url":"https://www.proteinatlas.org/search/CDX4"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O14627","domains":[{"cath_id":"1.10.10.60","chopping":"179-242","consensus_level":"medium","plddt":94.9158,"start":179,"end":242}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14627","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14627-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14627-F1-predicted_aligned_error_v6.png","plddt_mean":61.78},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDX4","jax_strain_url":"https://www.jax.org/strain/search?query=CDX4"},"sequence":{"accession":"O14627","fasta_url":"https://rest.uniprot.org/uniprotkb/O14627.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14627/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14627"}},"corpus_meta":[{"pmid":"13679919","id":"PMC_13679919","title":"cdx4 mutants fail to specify blood progenitors and can be rescued by multiple hox genes.","date":"2003","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/13679919","citation_count":202,"is_preprint":false},{"pmid":"7902125","id":"PMC_7902125","title":"Murine Cdx-4 bears striking similarities to the Drosophila caudal gene in its homeodomain sequence and early expression pattern.","date":"1993","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/7902125","citation_count":151,"is_preprint":false},{"pmid":"16396910","id":"PMC_16396910","title":"The Cdx4 mutation affects axial development and reveals an essential role of Cdx genes in the ontogenesis of the placental labyrinth in mice.","date":"2006","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16396910","citation_count":94,"is_preprint":false},{"pmid":"16309666","id":"PMC_16309666","title":"Cdx4 is a direct target of the canonical Wnt pathway.","date":"2005","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/16309666","citation_count":89,"is_preprint":false},{"pmid":"18234725","id":"PMC_18234725","title":"Cdx4 is required in the endoderm to localize the pancreas and limit beta-cell number.","date":"2008","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/18234725","citation_count":45,"is_preprint":false},{"pmid":"19301404","id":"PMC_19301404","title":"Overlapping functions of Cdx1, Cdx2, and Cdx4 in the development of the amphibian Xenopus tropicalis.","date":"2009","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/19301404","citation_count":40,"is_preprint":false},{"pmid":"16281167","id":"PMC_16281167","title":"cdx4/lacZ and cdx2/lacZ protein gradients formed by decay during gastrulation in the mouse.","date":"2005","source":"The International journal of developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/16281167","citation_count":29,"is_preprint":false},{"pmid":"24286030","id":"PMC_24286030","title":"A Cdx4-Sall4 regulatory module controls the transition from mesoderm formation to embryonic hematopoiesis.","date":"2013","source":"Stem cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/24286030","citation_count":29,"is_preprint":false},{"pmid":"17183676","id":"PMC_17183676","title":"Cdx4 and menin co-regulate Hoxa9 expression in hematopoietic cells.","date":"2006","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/17183676","citation_count":28,"is_preprint":false},{"pmid":"20415644","id":"PMC_20415644","title":"A chemical genetic screen in zebrafish for pathways interacting with cdx4 in primitive hematopoiesis.","date":"2010","source":"Zebrafish","url":"https://pubmed.ncbi.nlm.nih.gov/20415644","citation_count":28,"is_preprint":false},{"pmid":"21471217","id":"PMC_21471217","title":"HoxA10 activates CDX4 transcription and Cdx4 activates HOXA10 transcription in myeloid cells.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21471217","citation_count":23,"is_preprint":false},{"pmid":"21666599","id":"PMC_21666599","title":"Modulation of Tcf3 repressor complex composition regulates cdx4 expression in zebrafish.","date":"2011","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/21666599","citation_count":22,"is_preprint":false},{"pmid":"28408465","id":"PMC_28408465","title":"Human definitive hematopoietic specification from pluripotent stem cells is regulated by mesodermal expression of CDX4.","date":"2017","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/28408465","citation_count":21,"is_preprint":false},{"pmid":"23038246","id":"PMC_23038246","title":"β-Catenin activates the HOXA10 and CDX4 genes in myeloid progenitor cells.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23038246","citation_count":16,"is_preprint":false},{"pmid":"26773000","id":"PMC_26773000","title":"CDX4 and retinoic acid interact to position the hindbrain-spinal cord transition.","date":"2016","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/26773000","citation_count":15,"is_preprint":false},{"pmid":"20933081","id":"PMC_20933081","title":"Cdx4 is a Cdx2 target gene.","date":"2010","source":"Mechanisms of development","url":"https://pubmed.ncbi.nlm.nih.gov/20933081","citation_count":15,"is_preprint":false},{"pmid":"26335559","id":"PMC_26335559","title":"Spatiotemporal analysis of zebrafish hox gene regulation by Cdx4.","date":"2015","source":"Developmental dynamics : an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/26335559","citation_count":15,"is_preprint":false},{"pmid":"25531430","id":"PMC_25531430","title":"Regulation of CDX4 gene transcription by HoxA9, HoxA10, the Mll-Ell oncogene and Shp2 during leukemogenesis.","date":"2014","source":"Oncogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/25531430","citation_count":14,"is_preprint":false},{"pmid":"20494928","id":"PMC_20494928","title":"Cdx4 is dispensable for murine adult hematopoietic stem cells but promotes MLL-AF9-mediated leukemogenesis.","date":"2010","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/20494928","citation_count":14,"is_preprint":false},{"pmid":"36552416","id":"PMC_36552416","title":"Chicken LEAP2 Level Substantially Changes with Feed Intake and May Be Regulated by CDX4 in Small Intestine.","date":"2022","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/36552416","citation_count":13,"is_preprint":false},{"pmid":"30825428","id":"PMC_30825428","title":"CDX4 regulates the progression of neural maturation in the spinal cord.","date":"2019","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/30825428","citation_count":10,"is_preprint":false},{"pmid":"15950614","id":"PMC_15950614","title":"A consensus Oct1 binding site is required for the activity of the Xenopus Cdx4 promoter.","date":"2005","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/15950614","citation_count":7,"is_preprint":false},{"pmid":"25401498","id":"PMC_25401498","title":"Spatiotemporal expression of Cdx4 in the developing anorectum of rat embryos with ethylenethiourea-induced anorectal malformations.","date":"2014","source":"Cells, tissues, organs","url":"https://pubmed.ncbi.nlm.nih.gov/25401498","citation_count":6,"is_preprint":false},{"pmid":"31770439","id":"PMC_31770439","title":"The ParaHox gene Cdx4 induces acute erythroid leukemia in mice.","date":"2019","source":"Blood advances","url":"https://pubmed.ncbi.nlm.nih.gov/31770439","citation_count":4,"is_preprint":false},{"pmid":"34389276","id":"PMC_34389276","title":"Zebrafish Cdx4 regulates neural crest cell specification and migratory behaviors in the posterior body.","date":"2021","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/34389276","citation_count":3,"is_preprint":false},{"pmid":"35569347","id":"PMC_35569347","title":"CD1d expression demarcates CDX4+ hemogenic mesoderm with definitive hematopoietic potential.","date":"2022","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/35569347","citation_count":1,"is_preprint":false},{"pmid":"17196761","id":"PMC_17196761","title":"Ex vivo expanding hematopoietic stem cells by intracellular delivery of Cdx4 fusion proteins.","date":"2006","source":"Medical hypotheses","url":"https://pubmed.ncbi.nlm.nih.gov/17196761","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14706,"output_tokens":5579,"usd":0.063901,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14087,"output_tokens":5287,"usd":0.101305,"stage2_stop_reason":"end_turn"},"total_usd":0.165206,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"cdx4 (kugelig locus in zebrafish) regulates hox gene expression and is required for specification of haematopoietic cell fate; haematopoietic defects in cdx4 mutants are rescued by overexpression of hoxb7a or hoxa9a (but not hoxb8a), placing cdx4 upstream of specific hox genes in blood progenitor specification. cdx4 overexpression in mouse embryonic stem cells induces blood formation and alters hox gene expression.\",\n      \"method\": \"Zebrafish forward genetics (kugelig mutant), rescue by hox gene overexpression, mESC overexpression assay, genetic epistasis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with rescue experiments, replicated across zebrafish and mESC systems, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"13679919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Murine Cdx-4 protein and mRNA are expressed in a posterior-to-anterior gradient during gastrulation (7.0–10 d.p.c.), localized to allantois, primitive streak, neurectoderm, presomitic and lateral plate mesoderm, and hindgut endoderm, suggesting a role in anteroposterior axial specification.\",\n      \"method\": \"In situ hybridization and immunohistochemistry in mouse embryos\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by two orthogonal methods (ISH + IHC), single lab, no functional manipulation\",\n      \"pmids\": [\"7902125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cdx4 is a direct transcriptional target of the canonical Wnt pathway; LEF1 and β-catenin bind the Cdx4 promoter at multiple LEF/TCF response elements in embryocarcinoma cells and in the embryonic tailbud, and Cdx4 expression is reduced in Wnt3a-null embryos.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), promoter-reporter transfection assays, Wnt3a-null mouse embryos, Wnt inhibitor treatment ex vivo\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP in two contexts (cell line and embryo), promoter mutagenesis, loss-of-function genetic model, multiple orthogonal methods in one study\",\n      \"pmids\": [\"16309666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"cdx4 and cdx2 protein gradients form along the neural and mesodermal tissues by decay of protein activity as cells move away from the regressing tailbud; an intronic enhancer element of cdx4 is required for correct spatial transgene expression.\",\n      \"method\": \"lacZ reporter transgenic mice, in situ hybridization\",\n      \"journal\": \"The International journal of developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transgenic reporter assay showing gradient formation and identifying essential intronic enhancer, single lab\",\n      \"pmids\": [\"16281167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cdx4 combined with Cdx2 is required for chorio-allantoic fusion and development of the placental labyrinth; in Cdx2/Cdx4 compound mutants, the allantoic vascular network fails to extend into chorionic ectoderm, revealing a redundant role for Cdx4 in placental morphogenesis.\",\n      \"method\": \"Targeted mouse knockout, compound mutant analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined cellular and morphological phenotype, compound mutant epistasis, peer-reviewed\",\n      \"pmids\": [\"16396910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cdx4 and the transcriptional coregulator menin both bind the same regulatory region of the Hoxa9 locus in hematopoietic cells and co-activate Hoxa9 transcription; ablation of menin abolishes Cdx4 access to chromatin and reduces histone H3K4 trimethylation at the Hoxa9 locus.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), reporter co-activation assays, menin knockdown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP demonstrating co-occupancy, functional reporter assay, loss-of-function showing chromatin consequences, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17183676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"cdx4 functions cell-autonomously within the endoderm to localize foregut organs (pancreas, liver, small intestine) along the anterior-posterior axis; endoderm-specific cdx4 knockdown recapitulates posteriorly shifted pancreas, and endoderm-specific overexpression shifts the pancreas anteriorly. Cdx4 may block pancreatic identity by suppressing retinoic acid signaling in posterior endoderm.\",\n      \"method\": \"Morpholino knockdown and tissue-specific overexpression in zebrafish, cdx4 mutant analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific gain- and loss-of-function with defined cellular phenotype, zebrafish mutant corroboration, single lab\",\n      \"pmids\": [\"18234725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdx2 directly binds Cdx response elements in the Cdx4 promoter and activates its transcription; Cdx4 expression is significantly reduced in Cdx2-null mouse embryos; Cdx2 and canonical Wnt signaling regulate Cdx4 through distinct mechanisms.\",\n      \"method\": \"EMSA, ChIP in embryos, promoter-reporter transfection, Cdx2 knockout mouse\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA showing direct binding, ChIP in vivo, promoter mutagenesis, genetic model, multiple orthogonal methods\",\n      \"pmids\": [\"20933081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of Cdx4 in mice has minimal effect on adult steady-state hematopoiesis (no significant change in HSC frequency or long-term repopulating activity), but Cdx4 deletion significantly delays MLL-AF9-induced acute myeloid leukemia, indicating Cdx4 participates in leukemogenesis downstream of this oncogene.\",\n      \"method\": \"Germline and conditional Cdx4 knockout in mice, competitive transplantation, retroviral MLL-AF9 bone marrow transplant model\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined hematopoietic phenotype, competitive transplant, leukemia model, multiple experimental approaches, single lab\",\n      \"pmids\": [\"20494928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HoxA10 directly activates CDX4 transcription by binding a cis element in the CDX4 promoter; Cdx4 in turn directly activates HOXA10 transcription by binding a cis element in the HOXA10 promoter; this bidirectional positive feedback loop amplifies Hox-Cdx activity in myeloid progenitors and is relevant to AML pathogenesis.\",\n      \"method\": \"Promoter-reporter assays, site-directed mutagenesis of cis elements, gene knockdown, ChIP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter-reporter with cis-element mutagenesis, ChIP, reciprocal regulation demonstrated, single lab\",\n      \"pmids\": [\"21471217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Tcf3 represses cdx4 expression by directly binding multiple sites in the cdx4 regulatory region in association with corepressors Groucho/TLE and HDAC1; the transcription factor E4f1 de-represses cdx4 by dissociating corepressors from Tcf3 without displacing Tcf3 from DNA; the E3 ubiquitin ligase Lnx2b (acting as a scaffold) counteracts E4f1.\",\n      \"method\": \"Zebrafish embryo genetics, mammalian cell reporter assays, ChIP, protein interaction assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (ChIP, reporter assays, zebrafish genetics, protein interaction), mechanistically dissected, single lab\",\n      \"pmids\": [\"21666599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"β-catenin directly activates both CDX4 and HOXA10 transcription in myeloid progenitor cells through novel cis elements in their promoters; HoxA10-induced CDX4 transcription is augmented by FGF2-dependent β-catenin activation, creating a positive feedback circuit.\",\n      \"method\": \"ChIP demonstrating β-catenin occupancy at CDX4 and HOXA10 promoters, promoter-reporter assays, FGF2 manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assays, single lab, mechanistically links β-catenin directly to CDX4 transcription\",\n      \"pmids\": [\"23038246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ChIP-seq identified Sall4 as a direct Cdx4 transcriptional target in zebrafish; Sall4 in turn binds the cdx4 locus (auto- and cross-regulation); Cdx4 and Sall4 co-regulate hematopoietic initiation genes (hox, scl, lmo2); combined cdx4/sall4 knockdown impairs erythropoiesis, and overexpression of scl + lmo2 together rescues the erythroid program.\",\n      \"method\": \"ChIP-seq, gene-expression profiling, morpholino knockdown, overexpression rescue in zebrafish\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq, expression profiling, epistatic rescue experiments, multiple orthogonal approaches\",\n      \"pmids\": [\"24286030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HoxA9 represses CDX4 transcription in differentiating myeloid cells, antagonizing HoxA10 activation; tyrosine phosphorylation of HoxA10 impairs its activation of CDX4, while tyrosine phosphorylation of HoxA9 facilitates repression; constitutively active Shp2 blocks cytokine-induced phosphorylation of both, sustaining elevated CDX4 expression; Mll-Ell oncogene induces HoxA10-dependent CDX4 increase.\",\n      \"method\": \"Promoter-reporter assays, site-specific phosphorylation mutagenesis, Shp2 gain-of-function, ChIP, retroviral expression in myeloid progenitors\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple approaches (reporter, mutagenesis, ChIP), single lab, mechanistically dissects phosphorylation-dependent CDX4 regulation\",\n      \"pmids\": [\"25531430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cdx4 regulates the spatiotemporal activation of hox genes in zebrafish in a paralogous-group-dependent manner: loss of Cdx4 delays transcriptional initiation of group 5–10 hox genes in trunk neural tissue and trunk mesoderm, and prevents extension of group 11–13 hox expression beyond the tail bud. The primary effect is on the timing (initiation phase) of hox transcriptional activation.\",\n      \"method\": \"Cdx4 morpholino knockdown in zebrafish, spatial expression profiling of all 49 zebrafish hox genes by ISH\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic loss-of-function with comprehensive spatiotemporal readout across all hox paralog groups, single lab\",\n      \"pmids\": [\"26335559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cdx4 suppresses expression of the RA-degrading enzyme Cyp26a1 in the presumptive spinal cord domain, thereby preventing RA degradation and maintaining spinal cord identity; conversely, RA signaling inhibits cdx4 expansion in the hindbrain. This mutual antagonism between Cdx4 and Cyp26a1/RA positions the hindbrain-spinal cord boundary.\",\n      \"method\": \"Chemical inhibitors of RA signaling, morpholino knockdown of Cdx4, expression analysis in zebrafish\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with chemical and morpholino tools, defined molecular target (Cyp26a1), single lab\",\n      \"pmids\": [\"26773000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CDX4 expression is restricted to definitive hematopoietic KDR+CD235a- mesoderm in a WNT- and FGF-dependent manner in human pluripotent stem cell differentiation; exogenous CDX4 during mesoderm specification represses primitive hematopoietic potential and confers fivefold greater definitive hematopoietic potential; CDX4 knockout hPSCs retain primitive hematopoiesis but show fivefold decreased multilineage definitive hematopoietic potential.\",\n      \"method\": \"hPSC differentiation, lentiviral CDX4 overexpression, CRISPR knockout, transcriptome analysis, flow cytometry\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — both gain- and loss-of-function in human cells with defined hematopoietic lineage readouts, multiple orthogonal approaches, single lab\",\n      \"pmids\": [\"28408465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDX4 functions as a dual-function transcription factor in the spinal cord: it represses the early neural differentiation marker Nkx1.2 and promotes the late neural differentiation marker Pax6, while also preventing premature Pax6-dependent neural differentiation by blocking Ngn2 activation; RA signaling restricts this CDX4-over-Pax6 regulation to the rostral pre-neural tube.\",\n      \"method\": \"Gain- and loss-of-function experiments in chicken pre-neural tube, gene expression analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — both GOF and LOF with defined molecular targets, in vivo avian model, single lab\",\n      \"pmids\": [\"30825428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Aberrant Cdx4 expression in mice induces transplantable acute erythroid leukemia, associated with upregulation of stemness/leukemogenesis genes and downregulation of Gata1/Gata2 erythroid differentiation targets; Cdx4 induces a proteomic profile overlapping with primitive human erythroid progenitors; whole-exome sequencing of leukemic mice identified recurrent co-occurring mutations in erythroid transcription factors and TP53 targets.\",\n      \"method\": \"Retroviral Cdx4 overexpression in mice, bone marrow transplantation, gene expression profiling, proteomics, whole-exome sequencing\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo leukemia induction with transplantability, multi-omic characterization, single lab\",\n      \"pmids\": [\"31770439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Zebrafish cdx4 is expressed in trunk neural crest (NC) cell progenitors, directly binds NC cell-specific enhancers in the NC gene regulatory network, and regulates foxd3 expression in the posterior body; cdx4 mutants show disrupted segmental trunk NC migration (loss of leader/follower dynamics); cell transplantation showed Cdx4 acts tissue-autonomously within NC cells, not in adjacent paraxial mesoderm.\",\n      \"method\": \"cdx4 mutant analysis, ChIP (direct enhancer binding), morpholino knockdown, cell transplantation chimeras, live imaging in zebrafish\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP for direct enhancer binding, genetic mutant, cell-autonomous test by transplantation, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"34389276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDX4+ mesoderm in hPSC differentiation is uniquely enriched for CD1d surface expression; CD1d+ mesoderm harbors CD34+HOXA+ hemogenic endothelium with multilineage erythroid-myeloid-lymphoid potential; scRNAseq shows CDX4hi cells are enriched in CD1d+ fraction, providing a surface marker for CDX4+ definitive hemogenic mesoderm.\",\n      \"method\": \"scRNAseq, flow cytometry, hPSC differentiation, functional hematopoietic assays\",\n      \"journal\": \"Stem cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — scRNAseq plus flow cytometry plus functional assays, single lab, identifies CDX4+ cell identity\",\n      \"pmids\": [\"35569347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A consensus Oct1 (POU-domain octamer-binding protein) binding site in the proximal Cdx4 promoter is required for its activity; Oct1 co-expression induces Cdx4 reporter expression and mutation of the octamer site abolishes promoter activity; this octamer site is conserved in Cdx4 promoters across human, mouse, chicken, and zebrafish.\",\n      \"method\": \"Deletion analysis of Xenopus Cdx4 promoter, transgenic GFP reporter in Xenopus, promoter-reporter co-expression assay, site-directed mutagenesis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — promoter mutagenesis plus co-expression assay plus transgenic reporter, single lab, evolutionary conservation supports relevance\",\n      \"pmids\": [\"15950614\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDX4 is a homeodomain transcription factor that acts downstream of canonical Wnt (and FGF) signaling—with LEF1/β-catenin directly binding its promoter—and is itself transcriptionally regulated by Cdx2, HoxA9/HoxA10, Oct1, and Tcf3 (via Groucho/HDAC1 corepressors relieved by E4f1); CDX4 in turn directly binds and activates hox gene loci (in cooperation with menin-dependent H3K4 trimethylation), participates in a positive feedback loop with HoxA10, and specifies posterior mesoderm competence for definitive hematopoiesis, endodermal organ positioning, placental labyrinth development, neural crest migration (by binding NC-specific enhancers and regulating foxd3), and spinal cord neural progenitor maturation (by repressing Nkx1.2 and gating Pax6/Ngn2 activation), while aberrant CDX4 expression drives acute erythroid leukemia by blocking Gata1/Gata2-dependent erythroid differentiation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDX4 is a homeodomain transcription factor that reads out posterior positional information along the anteroposterior axis and translates it into hox-gene activation programs governing mesoderm, endoderm, and neural fate [#0, #14]. It is expressed in a posterior-to-anterior gradient during gastrulation [#1] and is positioned as a direct transcriptional output of canonical Wnt signaling, with LEF1/\\u03b2-catenin binding LEF/TCF response elements in its promoter and its expression lost in Wnt3a-null embryos [#2]; Cdx2 (via Cdx response elements), Oct1, and HoxA10 likewise directly activate the CDX4 promoter, while Tcf3 represses it through Groucho/TLE\\u2013HDAC1 corepressors that E4f1 relieves [#7, #21, #9, #10]. As an effector, CDX4 directly binds and activates hox loci\\u2014co-occupying the Hoxa9 regulatory region with menin, whose loss abolishes Cdx4 chromatin access and H3K4 trimethylation [#5]\\u2014and controls the timing of group 5\\u201313 hox transcriptional initiation [#14]. Through these targets CDX4 specifies posterior mesoderm competence for definitive hematopoiesis: it drives blood formation and restricts primitive in favor of definitive hematopoietic potential in zebrafish, mouse, and human pluripotent stem cell systems, partly via the co-regulator Sall4 and the scl/lmo2 erythroid program [#0, #12, #16]. Cdx4 also acts cell-autonomously to position foregut organs in the endoderm by antagonizing retinoic acid signaling [#6], contributes redundantly with Cdx2 to placental labyrinth development [#4], guides trunk neural crest migration by binding neural-crest enhancers and regulating foxd3 [#19], and gates spinal cord neural progenitor maturation by repressing Nkx1.2 and tuning Pax6/Ngn2 activation [#17]. In hematopoietic malignancy, aberrant Cdx4 expression induces transplantable acute erythroid leukemia by blocking Gata1/Gata2-dependent differentiation [#18], and Cdx4 participates in MLL-AF9-driven leukemogenesis through a HoxA10-CDX4 positive feedback circuit [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Established CDX4 as a candidate axial patterning regulator by showing its graded posterior expression coincides with tissues undergoing anteroposterior specification.\",\n      \"evidence\": \"In situ hybridization and immunohistochemistry across mouse gastrulation stages\",\n      \"pmids\": [\"7902125\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional perturbation\", \"Mechanism of gradient formation not addressed\", \"Direct targets unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved where CDX4 sits in the hematopoietic specification hierarchy, placing it upstream of specific hox genes required for blood progenitor fate.\",\n      \"evidence\": \"Zebrafish kugelig mutant with hox-gene rescue and mESC overexpression\",\n      \"pmids\": [\"13679919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which hox targets are direct vs indirect not fully resolved\", \"Does not address adult vs definitive hematopoiesis distinction\", \"No biochemical demonstration of promoter binding\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the upstream signals and transcription factors driving CDX4, identifying canonical Wnt (LEF1/\\u03b2-catenin) and Oct1 as direct promoter activators and an intronic enhancer required for graded expression.\",\n      \"evidence\": \"ChIP, promoter-reporter mutagenesis, Wnt3a-null embryos, transgenic reporters in mouse and Xenopus\",\n      \"pmids\": [\"16309666\", \"15950614\", \"16281167\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How multiple inputs are integrated at the promoter unclear\", \"Gradient decay mechanism inferred from reporter, not biochemically defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated CDX4 acts as a chromatin-level hox activator and revealed redundant developmental roles, showing menin-dependent recruitment to Hoxa9 and a Cdx2/Cdx4 requirement for placental labyrinth formation.\",\n      \"evidence\": \"ChIP co-occupancy with menin knockdown; compound Cdx2/Cdx4 mouse knockouts\",\n      \"pmids\": [\"17183676\", \"16396910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether menin recruits Cdx4 or vice versa not resolved\", \"Direct placental targets of Cdx4 unidentified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed CDX4 patterns endodermal organ position cell-autonomously, linking its posterior activity to retinoic acid antagonism.\",\n      \"evidence\": \"Tissue-specific morpholino knockdown and overexpression in zebrafish\",\n      \"pmids\": [\"18234725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct endodermal transcriptional targets not defined\", \"Mechanism of RA suppression at gene level unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Separated CDX4's roles in normal versus malignant hematopoiesis, showing it is dispensable for steady-state HSCs but required for MLL-AF9 leukemogenesis.\",\n      \"evidence\": \"Germline/conditional Cdx4 knockout mice, competitive transplant, MLL-AF9 model\",\n      \"pmids\": [\"20494928\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Cdx4 supports MLL-AF9 leukemia not defined\", \"Redundancy with other Cdx genes in adult blood not excluded\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Cdx2 as a direct transcriptional activator of Cdx4 operating through a mechanism distinct from Wnt input.\",\n      \"evidence\": \"EMSA, in vivo ChIP, promoter-reporter, Cdx2 knockout mouse\",\n      \"pmids\": [\"20933081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Cdx2 and Wnt inputs are combinatorially integrated unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Uncovered feedback and repressive control architecture, establishing a reciprocal HoxA10\\u2013CDX4 activating loop and a Tcf3/Groucho/HDAC1 repression module relieved by E4f1.\",\n      \"evidence\": \"Promoter-reporter cis-element mutagenesis, ChIP, knockdown, protein-interaction assays in myeloid cells and zebrafish\",\n      \"pmids\": [\"21471217\", \"21666599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of switching between repressed and activated states in vivo unclear\", \"Role of Lnx2b scaffold in physiological contexts limited\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected FGF and \\u03b2-catenin signaling directly to CDX4 in myeloid progenitors, reinforcing the HoxA10-CDX4 amplifying circuit.\",\n      \"evidence\": \"ChIP for \\u03b2-catenin occupancy, promoter-reporter, FGF2 manipulation\",\n      \"pmids\": [\"23038246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; physiological relevance to normal progenitors versus leukemia not separated\", \"Quantitative contribution of FGF2 vs Wnt not parsed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined CDX4's downstream effector network for hematopoietic initiation, identifying Sall4 as a direct target in an auto/cross-regulatory loop co-regulating scl/lmo2.\",\n      \"evidence\": \"ChIP-seq, expression profiling, morpholino knockdown, scl+lmo2 rescue in zebrafish\",\n      \"pmids\": [\"24286030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide direct target set in mammalian cells not established\", \"Hierarchy among Sall4, hox, scl/lmo2 incompletely ordered\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CDX4 expression is post-translationally tuned in myeloid differentiation, with HoxA9 repression antagonizing HoxA10 activation and tyrosine phosphorylation/Shp2 controlling the balance.\",\n      \"evidence\": \"Promoter-reporter, phosphorylation-site mutagenesis, Shp2 gain-of-function, ChIP in myeloid progenitors\",\n      \"pmids\": [\"25531430\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; in vivo relevance of phospho-switch not tested\", \"Kinase upstream of HoxA9/A10 phosphorylation not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Clarified that CDX4 primarily controls the timing of hox transcriptional initiation in a paralog-group-dependent manner rather than steady-state levels.\",\n      \"evidence\": \"Cdx4 morpholino knockdown with comprehensive ISH profiling of all 49 zebrafish hox genes\",\n      \"pmids\": [\"26335559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding to delayed hox loci not demonstrated genome-wide\", \"Mechanism distinguishing paralog groups unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a CDX4\\u2013Cyp26a1/RA mutual antagonism that positions the hindbrain\\u2013spinal cord boundary.\",\n      \"evidence\": \"RA chemical inhibitors and Cdx4 morpholino knockdown in zebrafish\",\n      \"pmids\": [\"26773000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect repression of Cyp26a1 not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated in human cells that CDX4 acts as a switch favoring definitive over primitive hematopoiesis within WNT/FGF-dependent mesoderm.\",\n      \"evidence\": \"hPSC differentiation with lentiviral overexpression, CRISPR knockout, transcriptomics, flow cytometry\",\n      \"pmids\": [\"28408465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct targets driving the primitive-to-definitive switch not defined\", \"Whether effect is cell-autonomous within mesoderm not parsed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established CDX4 as a dual-function regulator of spinal cord progenitor maturation, repressing Nkx1.2 while promoting Pax6 yet preventing premature Ngn2-driven differentiation.\",\n      \"evidence\": \"Gain- and loss-of-function in chicken pre-neural tube with target gene analysis\",\n      \"pmids\": [\"30825428\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding to Nkx1.2/Pax6/Ngn2 loci not shown\", \"Single lab and single species\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified aberrant CDX4 as a driver of acute erythroid leukemia, mechanistically through blockade of Gata1/Gata2 erythroid differentiation.\",\n      \"evidence\": \"Retroviral Cdx4 overexpression in mice, transplantation, expression/proteomic profiling, whole-exome sequencing\",\n      \"pmids\": [\"31770439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Cdx4 directly represses Gata targets not established\", \"Cooperating mutations correlative, not functionally tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed CDX4 acts cell-autonomously in trunk neural crest, binding NC-specific enhancers and regulating foxd3 to control segmental migration.\",\n      \"evidence\": \"Zebrafish mutant, ChIP enhancer binding, morpholino, transplantation chimeras, live imaging\",\n      \"pmids\": [\"34389276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full NC enhancer target set not mapped\", \"How Cdx4 controls leader/follower dynamics mechanistically unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided a surface-marker handle (CD1d) for CDX4+ definitive hemogenic mesoderm, linking CDX4 identity to multilineage hematopoietic potential.\",\n      \"evidence\": \"scRNAseq, flow cytometry, functional hematopoietic assays in hPSC differentiation\",\n      \"pmids\": [\"35569347\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CDX4 directly regulates CD1d unknown\", \"Correlative cell-identity mapping, not mechanistic\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A genome-wide, mammalian direct-target map of CDX4 and a unified account of how a single graded transcription factor coordinates such distinct fates (blood, endoderm, neural crest, spinal cord) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of CDX4-DNA or CDX4-cofactor complexes\", \"Direct target sets largely defined in zebrafish, not human\", \"Context-specific cofactor logic distinguishing developmental vs leukemic outputs not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 9, 12, 14, 17, 19]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 9, 12, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 4, 6, 16, 17, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 9, 12, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MEN1\", \"HOXA10\", \"HOXA9\", \"CTNNB1\", \"LEF1\", \"TCF3\", \"SALL4\", \"CDX2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":6,"faith_total":6,"faith_pct":100.0}}