{"gene":"CDX2","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2005,"finding":"Cdx2 is required for repression of Oct4 and Nanog in outer trophectoderm cells of the mouse blastocyst; loss of Cdx2 results in failure to downregulate Oct4 and Nanog in outer cells and subsequent death of those cells, demonstrating Cdx2 is essential for ICM/TE lineage segregation.","method":"Homozygous Cdx2 knockout mouse embryos analyzed by immunofluorescence and in situ hybridization; loss-of-function with defined molecular phenotype","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with specific molecular phenotype (Oct4/Nanog de-repression), replicated conceptually across multiple subsequent studies","pmids":["15788452"],"is_preprint":false},{"year":2007,"finding":"Cdx2 acts cell-autonomously downstream of the first lineage allocation decision; Cdx2 mutant cells show cell-autonomous defects in Oct4, Nanog, and Eomesodermin expression but do not preferentially contribute to ICM in chimeric blastocysts, placing Cdx2 downstream of inside/outside positional information.","method":"Chimeric blastocyst analysis using Cdx2 mutant ES cells; live embryo tracking and immunofluorescence","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — chimeric embryo epistasis experiment with defined cell-autonomous molecular phenotype, replicates and extends PMID 15788452","pmids":["18067887"],"is_preprint":false},{"year":2010,"finding":"Maternally provided Cdx2 mRNA contributes to cell polarization (Par3 and aPKC localization) and compaction at the 8- and 16-cell stage; depletion of both maternal and zygotic Cdx2 causes earlier developmental arrest than zygotic depletion alone, with defects in cell polarity and trophectoderm gene expression (Gata3, Eomes).","method":"dsRNAi, siRNAi, and morpholino oligonucleotide depletion of maternal + zygotic Cdx2; immunofluorescence for polarity markers","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent depletion methods with consistent phenotype, multiple molecular readouts","pmids":["20430022"],"is_preprint":false},{"year":2009,"finding":"Nanog and Cdx2 bind to and repress each other's promoters, establishing reciprocal transcriptional cross-repression between the pluripotency and trophectoderm programs.","method":"Chromatin immunoprecipitation (ChIP), reporter luciferase assays, conditional TE differentiation ES cell line with Nanog overexpression/knockdown","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct promoter binding shown by ChIP plus functional reporter assays in a defined cell system, single lab","pmids":["19564890"],"is_preprint":false},{"year":2009,"finding":"Cdx2 directly regulates axial elongation genes T (Brachyury), Wnt3a, and Cyp26a1, acting as an integrator of caudalizing information through both Hox-independent (axial elongation) and Hox-dependent (somite patterning) pathways.","method":"Conditional Cdx2 knockout (tamoxifen-inducible Cre on floxed allele); ChIP to demonstrate direct occupancy of T, Wnt3a, Cyp26a1 promoters; gene expression analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — conditional KO with specific phenotype plus ChIP demonstrating direct target binding, single lab with multiple methods","pmids":["19906845"],"is_preprint":false},{"year":2002,"finding":"CDX2 directly binds to two CDX2-responsive elements in the 5'-flanking region of the liver-intestine cadherin (LI-cadherin/CDH17) gene and activates its transcription; CDX2 binding demonstrated by chromatin immunoprecipitation; LI-cadherin expression is tightly correlated with CDX2 in colorectal cancers and intestinal metaplasias.","method":"High-density oligonucleotide arrays in CDX2-engineered HT-29 cells; ligand-regulated CDX2 activation in presence of protein synthesis inhibitor; ChIP; 5'-flanking region reporter assays","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution-level direct target identification using rapid induction, protein synthesis inhibitor controls, ChIP, and reporter assays; single lab but multiple orthogonal methods","pmids":["12404231"],"is_preprint":false},{"year":2000,"finding":"Cdx2 protein binds the TTTAC caudal-related protein binding site in the lactase gene promoter (CE-LPH1) and activates transcription; CDX2-binding complex is more abundant in differentiated enterocytes; CDX2 expression construct activates endogenous lactase mRNA.","method":"Electrophoretic mobility shift assay (EMSA) with Cdx2 antibody supershift; luciferase reporter assays with wild-type and mutant promoter; Cdx2 expression construct transfection","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct DNA binding shown by EMSA/supershift, functional validation by reporter assay and endogenous mRNA induction, multiple methods in one study","pmids":["10611160"],"is_preprint":false},{"year":2005,"finding":"CDX2 directly regulates transcription of hephaestin (HEPH), an iron transport protein; CDX2 activation rapidly induces HEPH expression (insensitive to protein synthesis inhibitors), and CDX2 occupies HEPH regulatory regions by ChIP; CDX2 induction suppresses intracellular iron levels via HEPH-mediated iron export; elevated intracellular iron increases CDX2 expression, forming a regulatory loop.","method":"Microarrays in CDX2-transduced HT-29/WiDr cells; ligand-regulated CDX2; RNA interference; ChIP; intracellular iron assay","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — rapid-induction CDX2 activation with protein-synthesis inhibitor, RNAi, ChIP, and functional iron assay; multiple orthogonal methods in one study","pmids":["15825077"],"is_preprint":false},{"year":2005,"finding":"CDX2 directly activates the furin P1 promoter by binding to the CBS2 site (nt -1827 to -1821); CDX2-mediated furin induction correlates with intestinal epithelial differentiation, and furin inhibition impairs LPH activity and enterocyte morphological differentiation.","method":"Microarray; transient transfection reporter assays; EMSA with supershift and site-specific mutagenesis; ChIP; in situ hybridization; furin inhibitor treatment","journal":"American journal of physiology. Gastrointestinal and liver physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding site identified by EMSA + mutagenesis + ChIP with functional consequence shown by inhibitor, multiple orthogonal methods","pmids":["16239403"],"is_preprint":false},{"year":2009,"finding":"Cdx2 directly binds to predicted Cdx response elements in the Cdx4 promoter and activates its transcription; in vivo occupancy of the Cdx4 promoter by Cdx2 confirmed by ChIP from embryos; Cdx2 and canonical Wnt signaling regulate Cdx4 through distinct mechanisms.","method":"Transient transfection reporter assays; EMSA with site-specific mutagenesis of Cdx response elements; ChIP from embryos","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA with mutagenesis, in vivo ChIP from embryos, and reporter assays; multiple orthogonal methods confirming direct regulation","pmids":["20933081"],"is_preprint":false},{"year":2009,"finding":"Cdx2 recruits the Brm-type SWI/SNF chromatin remodeling complex to the villin promoter via a direct protein-protein interaction with SWI/SNF subunits; both Cdx2 binding and Brm are required for villin expression in gastrointestinal cells.","method":"GST pull-down assays showing direct Cdx2–SWI/SNF subunit interaction; ChIP showing co-recruitment of Cdx2 and Brm to the HCR-Cdx region; reporter assays; knockdown in SW480 cells","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — GST pulldown demonstrating direct protein interaction, in vivo ChIP, reporter assays and functional knockdown; multiple orthogonal methods","pmids":["19371634"],"is_preprint":false},{"year":2010,"finding":"Cdx2 controls apical-basolateral polarity in mouse enterocytes in vivo by regulating a gene network involved in endo-lysosomal maturation and apical protein transport; conditional Cdx2 ablation causes defective protein trafficking, ectopic lumen formation, and severe microvillus atrophy; Rab11a and Kif3b are direct Cdx2 targets mediating apical transport.","method":"Conditional intestine-specific Cdx2 knockout; 3D tissue culture; gene expression profiling; targeted suppression of Rab11a and Kif3b to recapitulate phenotype","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with specific molecular pathway identification, recapitulation by downstream target suppression, multiple phenotypic readouts","pmids":["20551175"],"is_preprint":false},{"year":2013,"finding":"MEX3A RNA-binding protein represses CDX2 expression post-transcriptionally by binding a specific determinant in the CDX2 mRNA 3'UTR; MEX3A impairs intestinal differentiation, affects cell cycle progression, and promotes expression of intestinal stem cell markers (LGR5, BMI1, MSI1).","method":"Genome-wide 3D culture screening; cell-based assays with MEX3A overexpression/knockdown; luciferase 3'UTR reporter assay; murine intestine expression studies","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'UTR reporter assay plus gain/loss-of-function with multiple downstream readouts; single lab","pmids":["23408853"],"is_preprint":false},{"year":2004,"finding":"CDX2 down-regulates COX-2 promoter activity by physically interacting with the p65 subunit of NF-κB and inhibiting p65-induced NF-κB transcriptional activity; CDX2 co-immunoprecipitates with p65 in colon cancer cells.","method":"Co-immunoprecipitation; luciferase reporter assays; ectopic CDX2 expression in colorectal cancer cells; PMA stimulation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus reporter assays showing functional interaction, single lab, two methods","pmids":["15013430"],"is_preprint":false},{"year":2006,"finding":"CDX2 directly activates TFF3 transcription by binding to at least two CDX-binding sites in the human TFF3 promoter, with the proximal site at -63 being most important; CDX2 overexpression induces endogenous TFF3 mRNA in AGS gastric cells.","method":"Luciferase reporter assays with deletion constructs; EMSA identifying CDX-binding sites; stable CDX2 transfection in AGS cells","journal":"Regulatory peptides","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — EMSA plus functional reporter assays and endogenous gene induction; single lab","pmids":["17182120"],"is_preprint":false},{"year":2013,"finding":"CDX2 activates APC and AXIN2 promoter activities via intestinal cell-specific enhancer elements; suppressed CDX2 expression is associated with downregulation of APC and AXIN2 and elevated nuclear β-catenin in migrating colon cancer cells, linking CDX2 loss to Wnt/β-catenin pathway activation at the invasive front.","method":"Transient transfection of promoter/enhancer reporter constructs; CDX2 knockdown with measurement of endogenous APC, AXIN2; immunohistochemistry of invasive front in vivo","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reporter assays with cell-line knockdown plus in vivo immunohistochemistry correlation; single lab","pmids":["23393221"],"is_preprint":false},{"year":2012,"finding":"CDX2 drives KLF4 repression in AML cells through tissue-specific patterns of promoter binding and epigenetic modifications; CDX2 differentially regulates KLF4 in AML versus colon cancer cells; PPARγ agonists de-repress KLF4 and are preferentially toxic to CDX2+ leukemic cells.","method":"ChIP for CDX2 promoter binding; gene expression in CDX2-expressing AML vs. colon cancer cells; PPARγ agonist treatment; functional toxicity assays","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating differential promoter binding, functional drug-sensitivity assay, single lab","pmids":["23202735"],"is_preprint":false},{"year":2015,"finding":"CDX2 is required in Lgr5+ intestinal stem cells (ISCs) for proliferation and long-term production of mature lineages; CDX2 occupancy in ISCs is largely anticipatory (bound before gene activation), and CDX2 both activates and represses direct ISC targets—distinct from its predominantly activating role in villus cells.","method":"RNA sequencing of Lgr5+ ISCs vs. villus cells; CDX2-specific deletion in Lgr5+ ISCs; ChIP-seq for CDX2 binding in ISCs; mRNA profiling of control vs. Cdx2−/− ISCs","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — conditional KO with specific proliferation phenotype plus genome-wide ChIP-seq and mRNA profiling; multiple orthogonal methods in one study","pmids":["26489894"],"is_preprint":false},{"year":2015,"finding":"Cdx2 cooperates with Foxa2 and Nkx2-1 to suppress the metastatic program in lung adenocarcinoma; simultaneous knockdown of all three transcription factors is sufficient to promote metastatic potential of non-metastatic cells, including up-regulation of invadopodia component Tks5long, Hmga2, and Snail.","method":"ShRNA knockdown of Cdx2/Foxa2/Nkx2-1 alone and in combination; in vivo metastasis assays; gene expression profiling; genetically engineered mouse model","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combinatorial in vivo knockdown with defined metastatic phenotype and gene expression changes; single study","pmids":["26341558"],"is_preprint":false},{"year":2002,"finding":"Gastric expression of Cdx2 alone is sufficient to induce intestinal metaplasia (alcian blue-positive goblet cells and intestine-specific gene expression) in transgenic mice, establishing a causal role for Cdx2 in intestinal transdifferentiation of the stomach.","method":"Foxa3/Cdx2 transgenic mice directing Cdx2 to gastric mucosa; histological and gene expression analysis","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic gain-of-function with histological and molecular validation; replicated conceptually across multiple subsequent studies","pmids":["11875002"],"is_preprint":false},{"year":2003,"finding":"CDX2 silencing in colon cancer operates through a dominant trans-acting repression mechanism rather than DNA methylation or histone deacetylation; somatic cell hybrids between CDX2-expressing and CDX2-negative lines all showed reduced CDX2, indicating a dominant repressor pathway; a ~9.5-kb 5'-flanking region contains key cis-elements for CDX2 transcription; restoration of CDX2 suppresses proliferation and soft agar growth in HT-29 cells.","method":"Nuclear run-off assays; 5-aza-dC and TSA treatment; somatic cell hybrid fusions; CDX2 expression restoration in CDX2-negative HT-29; soft agar assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mechanistic approaches (nuclear run-off, hybrid repression, 5'-flanking region analysis, functional rescue); single lab","pmids":["12947088"],"is_preprint":false},{"year":2007,"finding":"Cdx2 expression is reduced during wound healing by transcription factors Snail and Slug (epithelial-mesenchymal transition factors), which can repress Cdx2 transcription; forced Cdx2 expression retards wound repair and reduces migration in colon cancer cell lines; Cdx2 RNA interference enhances migration; forced Cdx2 expression opposes tumor cell spreading in vivo (nude mouse xenografts).","method":"In vitro wound healing assays; RNA interference; forced expression; in vivo xenograft at three sites","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with migration/invasion readouts; identification of upstream repressors Snail/Slug; single lab","pmids":["17599044"],"is_preprint":false},{"year":2017,"finding":"AMPK enhances CDX2 expression via epigenetic mechanisms: AMPK inactivation is associated with PRC2-mediated enrichment of repressive H3K27me3 and LSD1-mediated reduction of permissive H3K4me3 at the Cdx2 promoter; CDX2 deficiency abolishes intestinal differentiation promoted by AMPK; epithelial AMPK knockout in vivo reduces CDX2 expression and impairs barrier function.","method":"AMPK activator/dominant-negative mutant transfection in Caco-2; ChIP for H3K27me3 and H3K4me3 at Cdx2 promoter; epithelial AMPK conditional KO mouse; transepithelial resistance/FITC-dextran permeability assays","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP for histone marks plus conditional KO in vivo plus multiple functional readouts; single lab with several orthogonal methods","pmids":["28234358"],"is_preprint":false},{"year":2011,"finding":"miR-9 directly targets the 3'-UTR of CDX2 mRNA to down-regulate CDX2 protein expression; miR-9 overexpression reduces CDX2 protein and its downstream targets (p21, MUC2, TFF3), while miR-9 knockdown restores CDX2 and inhibits cell growth via G1 arrest in gastric cancer cells.","method":"Luciferase reporter with CDX2 3'-UTR; pre-miR-9 transfection; anti-miR-9 knockdown; miR-9 and CDX2 protein correlation in cell lines and primary tissues","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'UTR reporter assay plus gain/loss-of-function with multiple downstream readouts; single lab","pmids":["21225631"],"is_preprint":false},{"year":2012,"finding":"The BMP/SMAD pathway (activated by H. pylori infection) upregulates CDX2 expression while downregulating SOX2 in gastric cells; SMAD4 knockdown impairs these effects; infected mice show BMP pathway upregulation, focal Cdx2 expression, and decreased Sox2; proximity ligation assay confirms SMAD protein interactions.","method":"Co-culture of AGS cells with H. pylori or BMP2; SMAD4 knockdown; proximity ligation assay; qPCR and western blot; immunohistochemistry in H. pylori-infected mice","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo evidence with pathway perturbation (SMAD4 KD) and protein interaction assay; single lab","pmids":["22791809"],"is_preprint":false},{"year":2022,"finding":"Cdx2 regulates NLRP3 inflammasome activity through transcriptional activation of TRIM31 (an NLRP3 suppressor); conditional Cdx2 loss reduces TRIM31, leading to elevated NLRP3, increased IL-1β and IL-6; NLRP3 inhibition reduces cytokine levels and extends lifespan of Cdx conditional mutants; TNF-α also activates NF-κB independently of NLRP3 in Cdx mutants.","method":"Conditional Cdx knockout mouse; cytokine measurement; NLRP3 inhibitor treatment; TRIM31 target gene validation; in silico analysis of UC patients","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pathway-specific pharmacological rescue, functional cytokine readouts; single lab","pmids":["35985421"],"is_preprint":false},{"year":2013,"finding":"β-catenin signaling directly regulates Cdx2 expression in the dorsal posterior neuropore; conditional β-catenin loss represses Cdx2 and Pax3, leading to spina bifida and tail truncation; Pax3 and Cdx2 are identified as novel Wnt/β-catenin downstream targets; both β-catenin and Pax3 are required for Cdx2 expression in the dorsal PNP.","method":"Conditional β-catenin knockout in dorsal neural folds; gene expression analysis; Pax3 transgenic rescue experiment showing partial rescue without restoration of Cdx2","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus transgenic rescue epistasis experiment; single study identifying Cdx2 as downstream of β-catenin","pmids":["24284205"],"is_preprint":false},{"year":2017,"finding":"CDX2 loss cooperates with BRAFV600E to drive serrated colorectal tumorigenesis; CDX2Null/BRAFV600E expression in adult mouse intestinal epithelium produces serrated tumors including carcinomas with gastric marker expression; organoids from CDX2Null/BRAFV600E epithelium recapitulate serrated morphology and gene expression.","method":"CDX2 conditional knockout combined with BRAFV600E knock-in in mouse intestinal epithelium; organoid culture; gene expression profiling","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo epistasis genetic model with organoid validation; single lab","pmids":["28072391"],"is_preprint":false},{"year":2018,"finding":"Mosaic intestinal Cdx2 knockout causes metaplastic cells that, without themselves becoming tumorigenic, modify the microenvironment to facilitate tumorigenesis in adjacent Cdx2-intact tumor-prone cells via NF-κB activation, induction of inducible nitric oxide synthase, and stochastic Apc loss of function — a non-cell-autonomous tumor suppressor mechanism.","method":"Mosaic conditional Cdx2 knockout in adult intestinal epithelium; NF-κB and iNOS pathway analysis; adjacent cell tumorigenesis assessment","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mosaic KO with defined non-cell-autonomous mechanism and pathway identification; single lab","pmids":["29439001"],"is_preprint":false},{"year":2009,"finding":"Bile acids induce Cdx2 expression in gastric epithelial cells through the farnesoid X receptor (FXR); the FXR agonist GW4064 mimics bile acid-induced Cdx2 and MUC2 upregulation, and the FXR antagonist guggulsterone abolishes both effects.","method":"RGM-1 gastric epithelial cells treated with CDCA and FXR agonist/antagonist; qPCR and protein level analysis of Cdx2 and MUC2","journal":"Journal of clinical biochemistry and nutrition","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological gain/loss of FXR function with consistent Cdx2 induction; single lab, single cell line","pmids":["20104269"],"is_preprint":false},{"year":2010,"finding":"Cdx2 overexpression in the small intestine reduces nuclear β-catenin in Paneth cells (without homeotic posteriorization) and alters crypt base organization, suggesting Cdx2 regulates Wnt/β-catenin transcriptional activity in a cell-type-specific manner in the intestinal epithelium.","method":"Villin-Cdx2 transgenic mice; immunohistochemistry for β-catenin, lineage markers; gene expression analysis","journal":"Gastroenterology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic gain-of-function with defined molecular readout (β-catenin nuclear localization); single lab","pmids":["21081128"],"is_preprint":false},{"year":2024,"finding":"KAT8-mediated H4K16 acetylation is required for transcriptional activation of CDX2 in trophoblast stem cells; KAT8 knockout reduces H4K16ac at the CDX2 locus, decreasing CDX2 expression and causing TSC self-renewal defects; CDX2 overexpression partially rescues Kat8 KO phenotype; SIRT1 inhibition (EX527) restores H4K16ac and CDX2 levels.","method":"Trophoblast-specific Kat8 conditional KO; RNA-seq; CUT&Tag for H4K16ac; CDX2 rescue overexpression; SIRT1 inhibitor EX527 treatment; trophoblast organoids","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — CUT&Tag chromatin profiling plus conditional KO plus epistatic rescue plus pharmacological rescue; multiple orthogonal methods","pmids":["38961108"],"is_preprint":false},{"year":2016,"finding":"Distinct cis-regulatory elements control Cdx2 expression at different developmental stages: one enhancer regulated by Hippo and Notch signaling is active in blastocyst trophectoderm but inactive in post-implantation extraembryonic structures; additional regulatory elements include a stem-cell-specific sequence active in trophoblast stem cells and a separate element active in post-implantation TE.","method":"Comparative analysis of Cdx2 enhancer constructs by reporter transgenic assays in blastocyst, trophoblast stem cells, and post-implantation embryo; CRISPR interference","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic reporter assays across multiple developmental contexts with identification of distinct regulatory elements; single lab","pmids":["27256674"],"is_preprint":false},{"year":2015,"finding":"Achaete-scute-like 2 (Ascl2) represses CDX2 transcription by directly binding to the proximal E-box of the CDX2 promoter; Ascl2 knockdown activates CDX2 expression and promotes goblet cell differentiation; Ascl2 overexpression inhibits CDX2 and MUC2 expression.","method":"Luciferase reporter assays with CDX2 promoter constructs; ChIP demonstrating Ascl2 binding to CDX2 proximal E-box; siRNA knockdown and overexpression","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assays with gain/loss-of-function; single lab","pmids":["26307678"],"is_preprint":false},{"year":2020,"finding":"JARID1B, an H3K4me3 demethylase, represses CDX2 expression by demethylation of H3K4me3 at the CDX2 locus; CDX2 is a downstream target mediating JARID1B-driven Wnt/β-catenin signaling and colorectal cancer cell proliferation.","method":"ChIP for H3K4me3 at CDX2 locus; JARID1B knockdown/overexpression; transcriptome analysis; CDX2 rescue experiments","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus gain/loss-of-function with CDX2 rescue establishing epistasis; single lab","pmids":["33109187"],"is_preprint":false},{"year":2021,"finding":"LIN28B directly binds CDX2 mRNA (demonstrated by RNA-binding protein immunoprecipitation, RIP assay) and enhances CDX2 expression post-transcriptionally, promoting CRC differentiation; CDX2 in turn activates AMACR transcription, which enhances intestinal alkaline phosphatase activity via butyric acid upregulation.","method":"RNA-binding protein IP (RIP) assay; CDX2 ChIP-seq identifying AMACR as direct target; subcutaneous xenograft and liver metastasis mouse models","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrating direct mRNA binding plus ChIP-seq for CDX2 target identification plus in vivo functional models; single lab","pmids":["33755595"],"is_preprint":false},{"year":2014,"finding":"CDX2 enhances trophoblast cell invasiveness by increasing MMP-9 expression and suppressing TIMP-1; PI3K/Akt signaling regulates CDX2 expression in trophoblast cells, as PI3K/Akt inhibition decreases CDX2 levels.","method":"CDX2 overexpression in HTR-8/SVneo trophoblast cells; Transwell invasion assays; western blot and qRT-PCR for MMP-9/TIMP-1; PI3K inhibitor treatment","journal":"Cellular physiology and biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single overexpression approach with pharmacological inhibitor; no direct binding between CDX2 and MMP-9 promoter demonstrated","pmids":["25171776"],"is_preprint":false},{"year":2019,"finding":"CDX2 binds the miR-145-5p promoter region and inhibits its transcription, as demonstrated by ChIP; miR-145-5p in turn targets SENP1 3'-UTR to inhibit its translation, establishing a CDX2/miR-145-5p/SENP1 regulatory axis affecting prostate cancer cell invasion and migration.","method":"ChIP demonstrating CDX2 binding to miR-145-5p promoter; dual-luciferase reporter for SENP1 3'-UTR; lentiviral miR-145-5p overexpression; invasion/migration Transwell assay","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional invasion assays; single lab, novel cellular context (prostate cancer)","pmids":["31249806"],"is_preprint":false}],"current_model":"CDX2 is a caudal-type homeodomain transcription factor that directly binds CDX-response elements in target gene promoters to activate intestine-specific programs (lactase, LI-cadherin, hephaestin, furin, villin, TFF3, Cdx4, TRIM31, AMACR) and repress pluripotency genes (Oct4, Nanog) in trophectoderm; it recruits the Brm-type SWI/SNF chromatin remodeling complex, responds to upstream signals including Wnt/β-catenin, BMP/SMAD, AMPK (via H3K27me3/H3K4me3 histone modifications), FXR (bile acids), and KAT8 (H4K16ac), while being post-transcriptionally regulated by miR-9 and MEX3A; it controls epithelial cell polarity through endo-lysosomal and apical transport genes (Rab11a, Kif3b), suppresses NF-κB–driven inflammation via COX-2 and NLRP3/TRIM31 pathways, antagonizes cell migration through Snail/Slug-regulated mechanisms, and its context-dependent activity underlies lineage specification in early embryos, intestinal homeostasis, and tumor suppression in the gut."},"narrative":{"mechanistic_narrative":"CDX2 is a caudal-type homeodomain transcription factor that binds CDX-response elements to enforce intestinal and trophectoderm identity, with context-dependent activating and repressive functions across early development, gut homeostasis, and tumor suppression [PMID:15788452, PMID:12404231, PMID:26489894]. In the preimplantation embryo, CDX2 acts cell-autonomously downstream of inside/outside positional cues to repress the pluripotency factors Oct4 and Nanog in outer trophectoderm cells, with which it forms a reciprocal cross-repressive circuit; maternal CDX2 mRNA additionally contributes to cell polarization and compaction [PMID:15788452, PMID:18067887, PMID:20430022, PMID:19564890]. In the gut, CDX2 directly transactivates a battery of intestine-specific genes — LI-cadherin/CDH17, lactase, hephaestin, furin, TFF3, villin, and AMACR — and its gastric expression alone is sufficient to drive intestinal metaplasia [PMID:12404231, PMID:10611160, PMID:15825077, PMID:16239403, PMID:17182120, PMID:11875002, PMID:33755595]. CDX2 transactivation requires recruitment of the Brm-type SWI/SNF chromatin-remodeling complex through direct protein-protein interaction [PMID:19371634]. Beyond differentiation genes, CDX2 controls enterocyte apical-basolateral polarity via the direct targets Rab11a and Kif3b, sustains Lgr5+ stem cell proliferation through largely anticipatory chromatin binding, and tunes Wnt/β-catenin output by activating APC and AXIN2 [PMID:20551175, PMID:23393221, PMID:26489894]. CDX2 functions as a tumor suppressor in the gut: it restrains NF-κB-driven inflammation by binding p65 and suppressing COX-2, dampens NLRP3 inflammasome activity through transcriptional activation of TRIM31, and antagonizes migration and metastasis, while its loss cooperates with BRAFV600E to drive serrated tumorigenesis [PMID:15013430, PMID:17599044, PMID:35985421, PMID:28072391, PMID:29439001]. CDX2 is itself a tightly regulated node: it is induced by BMP/SMAD, bile-acid/FXR, AMPK, KAT8-mediated H4K16ac, and β-catenin signaling, and repressed by miR-9, MEX3A, Ascl2, and the H3K4me3 demethylase JARID1B [PMID:28234358, PMID:21225631, PMID:22791809, PMID:24284205, PMID:20104269, PMID:38961108, PMID:26307678, PMID:33109187, PMID:23408853].","teleology":[{"year":2002,"claim":"Establishing that CDX2 is not merely a marker but a master driver of intestinal identity required showing it could impose that program on a foreign tissue.","evidence":"Foxa3-driven Cdx2 transgenic mice directing Cdx2 to gastric mucosa, with histology and gene expression","pmids":["11875002"],"confidence":"High","gaps":["Did not resolve which direct targets are necessary for metaplasia","Mechanism of cell-of-origin susceptibility not addressed"]},{"year":2002,"claim":"Defining how CDX2 executes the intestinal program at the gene level began with identifying direct cis-targets in differentiation genes.","evidence":"ChIP, reporter assays, and rapid ligand-regulated CDX2 induction in HT-29 cells for LI-cadherin/CDH17, lactase, hephaestin and furin promoters","pmids":["12404231","10611160","15825077","16239403"],"confidence":"High","gaps":["Cofactor requirements at individual promoters not initially defined","Hierarchy among targets in driving differentiation unresolved"]},{"year":2003,"claim":"Understanding why CDX2 is silenced in colon cancer addressed whether loss is epigenetic or genetic and whether restoration is functionally protective.","evidence":"Nuclear run-off, 5-aza-dC/TSA treatment, somatic cell hybrids, and CDX2 re-expression with soft-agar assay in HT-29 cells","pmids":["12947088"],"confidence":"Medium","gaps":["Identity of the dominant trans-acting repressor not determined","In vivo relevance of soft-agar suppression not tested"]},{"year":2005,"claim":"Determining the molecular basis of trophectoderm/ICM lineage segregation showed CDX2 is essential to repress pluripotency genes in outer cells.","evidence":"Homozygous Cdx2 knockout mouse blastocysts analyzed by immunofluorescence and in situ hybridization","pmids":["15788452"],"confidence":"High","gaps":["Direct vs. indirect repression of Oct4/Nanog not resolved here","Upstream positional inputs unaddressed"]},{"year":2007,"claim":"Placing CDX2 in the lineage decision hierarchy clarified whether it reads positional information or generates it.","evidence":"Chimeric blastocyst analysis with Cdx2 mutant ES cells and live embryo tracking","pmids":["18067887"],"confidence":"High","gaps":["Molecular nature of the inside/outside signal upstream of CDX2 not defined"]},{"year":2009,"claim":"Defining the reciprocity of the pluripotency-vs-trophectoderm switch showed CDX2 and Nanog mutually repress each other's promoters.","evidence":"ChIP, luciferase reporter assays, and conditional TE differentiation ES cell line","pmids":["19564890"],"confidence":"High","gaps":["Cofactors stabilizing the bistable switch not identified"]},{"year":2009,"claim":"Mapping how CDX2 acts in axial patterning and chromatin established direct caudalizing targets and the requirement for a remodeling complex.","evidence":"Conditional Cdx2 KO with ChIP for T/Wnt3a/Cyp26a1 and Cdx4; GST pull-down and ChIP showing CDX2-Brm/SWI-SNF recruitment to the villin promoter","pmids":["19906845","20933081","19371634"],"confidence":"High","gaps":["Which SWI/SNF subunit mediates the direct contact not pinpointed","Generality of SWI/SNF dependence across CDX2 targets untested"]},{"year":2010,"claim":"Extending CDX2 function beyond gene activation revealed it organizes enterocyte polarity and that maternal mRNA contributes to early polarization.","evidence":"Intestine-specific conditional Cdx2 KO with Rab11a/Kif3b suppression recapitulation; maternal+zygotic Cdx2 depletion by dsRNAi/siRNA/morpholino with polarity markers","pmids":["20551175","20430022"],"confidence":"High","gaps":["How a transcription factor coordinates a whole trafficking network mechanistically not fully resolved"]},{"year":2015,"claim":"Distinguishing CDX2's stem-cell role from its villus role showed it is required in Lgr5+ ISCs with anticipatory, bifunctional chromatin occupancy.","evidence":"ISC-specific Cdx2 deletion, ChIP-seq, and mRNA profiling of Lgr5+ ISCs vs villus cells","pmids":["26489894"],"confidence":"High","gaps":["Switch determining activation vs repression at bound sites unknown","Partner factors specifying ISC vs villus programs unidentified"]},{"year":2017,"claim":"Establishing CDX2 as a tumor suppressor in vivo showed its loss cooperates with oncogenic BRAF to drive serrated carcinogenesis.","evidence":"CDX2-conditional KO combined with BRAFV600E knock-in in mouse intestine and organoids","pmids":["28072391"],"confidence":"Medium","gaps":["Direct targets mediating serrated phenotype not defined","Whether CDX2 restoration reverses established tumors untested"]},{"year":2018,"claim":"Refining the tumor-suppressor mechanism revealed a non-cell-autonomous mode in which CDX2-null metaplastic cells modify the microenvironment to promote tumorigenesis in neighbors.","evidence":"Mosaic conditional Cdx2 KO in adult intestine with NF-κB/iNOS pathway analysis and adjacent-cell tumorigenesis assessment","pmids":["29439001"],"confidence":"Medium","gaps":["Secreted mediators bridging metaplastic and tumor-prone cells not identified"]},{"year":2022,"claim":"Connecting CDX2 to inflammasome control identified TRIM31 as the target linking CDX2 loss to NLRP3-driven cytokine release.","evidence":"Conditional Cdx KO mouse with TRIM31 target validation, cytokine measurement, and NLRP3 inhibitor rescue","pmids":["35985421"],"confidence":"Medium","gaps":["Direct CDX2 occupancy of the TRIM31 promoter not shown here","Relative contribution of NLRP3-independent NF-κB unresolved"]},{"year":2024,"claim":"Defining upstream control of CDX2 in trophoblast stem cells showed KAT8-deposited H4K16ac is required for CDX2 activation, opposed by SIRT1.","evidence":"Trophoblast Kat8 conditional KO, CUT&Tag for H4K16ac, CDX2 rescue, and SIRT1 inhibitor EX527 in trophoblast organoids","pmids":["38961108"],"confidence":"High","gaps":["How KAT8 is recruited to the CDX2 locus not defined"]},{"year":null,"claim":"How CDX2's anticipatory, bifunctional chromatin binding is switched between activation and repression at individual loci, and which partner factors dictate this in stem cells versus differentiated cells, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of CDX2-cofactor complexes on chromatin","Determinants of activation vs repression at bound sites unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,4,5,6,7,8,9,14,17,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,6,8,9,37]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3,5,17]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,5,6,10,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,2,4,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[20,27,28]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,22,31,34]}],"complexes":[],"partners":["NANOG","RELA","SMARCA2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99626","full_name":"Homeobox protein CDX-2","aliases":["CDX-3","Caudal-type homeobox protein 2"],"length_aa":313,"mass_kda":33.5,"function":"Transcription factor which regulates the transcription of multiple genes expressed in the intestinal epithelium (By similarity). Binds to the promoter of the intestinal sucrase-isomaltase SI and activates SI transcription (By similarity). Binds to the DNA sequence 5'-ATAAAAACTTAT-3' in the promoter region of VDR and activates VDR transcription (By similarity). Binds to and activates transcription of LPH (By similarity). Activates transcription of CLDN2 and intestinal mucin MUC2 (By similarity). Binds to the 5'-AATTTTTTACAACACCT-3' DNA sequence in the promoter region of CA1 and activates CA1 transcription (By similarity). Important in broad range of functions from early differentiation to maintenance of the intestinal epithelial lining of both the small and large intestine. 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Oct4 and Nanog in outer trophectoderm cells of the mouse blastocyst; loss of Cdx2 results in failure to downregulate Oct4 and Nanog in outer cells and subsequent death of those cells, demonstrating Cdx2 is essential for ICM/TE lineage segregation.\",\n      \"method\": \"Homozygous Cdx2 knockout mouse embryos analyzed by immunofluorescence and in situ hybridization; loss-of-function with defined molecular phenotype\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with specific molecular phenotype (Oct4/Nanog de-repression), replicated conceptually across multiple subsequent studies\",\n      \"pmids\": [\"15788452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cdx2 acts cell-autonomously downstream of the first lineage allocation decision; Cdx2 mutant cells show cell-autonomous defects in Oct4, Nanog, and Eomesodermin expression but do not preferentially contribute to ICM in chimeric blastocysts, placing Cdx2 downstream of inside/outside positional information.\",\n      \"method\": \"Chimeric blastocyst analysis using Cdx2 mutant ES cells; live embryo tracking and immunofluorescence\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — chimeric embryo epistasis experiment with defined cell-autonomous molecular phenotype, replicates and extends PMID 15788452\",\n      \"pmids\": [\"18067887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Maternally provided Cdx2 mRNA contributes to cell polarization (Par3 and aPKC localization) and compaction at the 8- and 16-cell stage; depletion of both maternal and zygotic Cdx2 causes earlier developmental arrest than zygotic depletion alone, with defects in cell polarity and trophectoderm gene expression (Gata3, Eomes).\",\n      \"method\": \"dsRNAi, siRNAi, and morpholino oligonucleotide depletion of maternal + zygotic Cdx2; immunofluorescence for polarity markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent depletion methods with consistent phenotype, multiple molecular readouts\",\n      \"pmids\": [\"20430022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nanog and Cdx2 bind to and repress each other's promoters, establishing reciprocal transcriptional cross-repression between the pluripotency and trophectoderm programs.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), reporter luciferase assays, conditional TE differentiation ES cell line with Nanog overexpression/knockdown\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct promoter binding shown by ChIP plus functional reporter assays in a defined cell system, single lab\",\n      \"pmids\": [\"19564890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cdx2 directly regulates axial elongation genes T (Brachyury), Wnt3a, and Cyp26a1, acting as an integrator of caudalizing information through both Hox-independent (axial elongation) and Hox-dependent (somite patterning) pathways.\",\n      \"method\": \"Conditional Cdx2 knockout (tamoxifen-inducible Cre on floxed allele); ChIP to demonstrate direct occupancy of T, Wnt3a, Cyp26a1 promoters; gene expression analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — conditional KO with specific phenotype plus ChIP demonstrating direct target binding, single lab with multiple methods\",\n      \"pmids\": [\"19906845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CDX2 directly binds to two CDX2-responsive elements in the 5'-flanking region of the liver-intestine cadherin (LI-cadherin/CDH17) gene and activates its transcription; CDX2 binding demonstrated by chromatin immunoprecipitation; LI-cadherin expression is tightly correlated with CDX2 in colorectal cancers and intestinal metaplasias.\",\n      \"method\": \"High-density oligonucleotide arrays in CDX2-engineered HT-29 cells; ligand-regulated CDX2 activation in presence of protein synthesis inhibitor; ChIP; 5'-flanking region reporter assays\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution-level direct target identification using rapid induction, protein synthesis inhibitor controls, ChIP, and reporter assays; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12404231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Cdx2 protein binds the TTTAC caudal-related protein binding site in the lactase gene promoter (CE-LPH1) and activates transcription; CDX2-binding complex is more abundant in differentiated enterocytes; CDX2 expression construct activates endogenous lactase mRNA.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) with Cdx2 antibody supershift; luciferase reporter assays with wild-type and mutant promoter; Cdx2 expression construct transfection\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct DNA binding shown by EMSA/supershift, functional validation by reporter assay and endogenous mRNA induction, multiple methods in one study\",\n      \"pmids\": [\"10611160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CDX2 directly regulates transcription of hephaestin (HEPH), an iron transport protein; CDX2 activation rapidly induces HEPH expression (insensitive to protein synthesis inhibitors), and CDX2 occupies HEPH regulatory regions by ChIP; CDX2 induction suppresses intracellular iron levels via HEPH-mediated iron export; elevated intracellular iron increases CDX2 expression, forming a regulatory loop.\",\n      \"method\": \"Microarrays in CDX2-transduced HT-29/WiDr cells; ligand-regulated CDX2; RNA interference; ChIP; intracellular iron assay\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — rapid-induction CDX2 activation with protein-synthesis inhibitor, RNAi, ChIP, and functional iron assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"15825077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CDX2 directly activates the furin P1 promoter by binding to the CBS2 site (nt -1827 to -1821); CDX2-mediated furin induction correlates with intestinal epithelial differentiation, and furin inhibition impairs LPH activity and enterocyte morphological differentiation.\",\n      \"method\": \"Microarray; transient transfection reporter assays; EMSA with supershift and site-specific mutagenesis; ChIP; in situ hybridization; furin inhibitor treatment\",\n      \"journal\": \"American journal of physiology. Gastrointestinal and liver physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding site identified by EMSA + mutagenesis + ChIP with functional consequence shown by inhibitor, multiple orthogonal methods\",\n      \"pmids\": [\"16239403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cdx2 directly binds to predicted Cdx response elements in the Cdx4 promoter and activates its transcription; in vivo occupancy of the Cdx4 promoter by Cdx2 confirmed by ChIP from embryos; Cdx2 and canonical Wnt signaling regulate Cdx4 through distinct mechanisms.\",\n      \"method\": \"Transient transfection reporter assays; EMSA with site-specific mutagenesis of Cdx response elements; ChIP from embryos\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA with mutagenesis, in vivo ChIP from embryos, and reporter assays; multiple orthogonal methods confirming direct regulation\",\n      \"pmids\": [\"20933081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cdx2 recruits the Brm-type SWI/SNF chromatin remodeling complex to the villin promoter via a direct protein-protein interaction with SWI/SNF subunits; both Cdx2 binding and Brm are required for villin expression in gastrointestinal cells.\",\n      \"method\": \"GST pull-down assays showing direct Cdx2–SWI/SNF subunit interaction; ChIP showing co-recruitment of Cdx2 and Brm to the HCR-Cdx region; reporter assays; knockdown in SW480 cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — GST pulldown demonstrating direct protein interaction, in vivo ChIP, reporter assays and functional knockdown; multiple orthogonal methods\",\n      \"pmids\": [\"19371634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdx2 controls apical-basolateral polarity in mouse enterocytes in vivo by regulating a gene network involved in endo-lysosomal maturation and apical protein transport; conditional Cdx2 ablation causes defective protein trafficking, ectopic lumen formation, and severe microvillus atrophy; Rab11a and Kif3b are direct Cdx2 targets mediating apical transport.\",\n      \"method\": \"Conditional intestine-specific Cdx2 knockout; 3D tissue culture; gene expression profiling; targeted suppression of Rab11a and Kif3b to recapitulate phenotype\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with specific molecular pathway identification, recapitulation by downstream target suppression, multiple phenotypic readouts\",\n      \"pmids\": [\"20551175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MEX3A RNA-binding protein represses CDX2 expression post-transcriptionally by binding a specific determinant in the CDX2 mRNA 3'UTR; MEX3A impairs intestinal differentiation, affects cell cycle progression, and promotes expression of intestinal stem cell markers (LGR5, BMI1, MSI1).\",\n      \"method\": \"Genome-wide 3D culture screening; cell-based assays with MEX3A overexpression/knockdown; luciferase 3'UTR reporter assay; murine intestine expression studies\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'UTR reporter assay plus gain/loss-of-function with multiple downstream readouts; single lab\",\n      \"pmids\": [\"23408853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CDX2 down-regulates COX-2 promoter activity by physically interacting with the p65 subunit of NF-κB and inhibiting p65-induced NF-κB transcriptional activity; CDX2 co-immunoprecipitates with p65 in colon cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; luciferase reporter assays; ectopic CDX2 expression in colorectal cancer cells; PMA stimulation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus reporter assays showing functional interaction, single lab, two methods\",\n      \"pmids\": [\"15013430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CDX2 directly activates TFF3 transcription by binding to at least two CDX-binding sites in the human TFF3 promoter, with the proximal site at -63 being most important; CDX2 overexpression induces endogenous TFF3 mRNA in AGS gastric cells.\",\n      \"method\": \"Luciferase reporter assays with deletion constructs; EMSA identifying CDX-binding sites; stable CDX2 transfection in AGS cells\",\n      \"journal\": \"Regulatory peptides\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA plus functional reporter assays and endogenous gene induction; single lab\",\n      \"pmids\": [\"17182120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CDX2 activates APC and AXIN2 promoter activities via intestinal cell-specific enhancer elements; suppressed CDX2 expression is associated with downregulation of APC and AXIN2 and elevated nuclear β-catenin in migrating colon cancer cells, linking CDX2 loss to Wnt/β-catenin pathway activation at the invasive front.\",\n      \"method\": \"Transient transfection of promoter/enhancer reporter constructs; CDX2 knockdown with measurement of endogenous APC, AXIN2; immunohistochemistry of invasive front in vivo\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reporter assays with cell-line knockdown plus in vivo immunohistochemistry correlation; single lab\",\n      \"pmids\": [\"23393221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CDX2 drives KLF4 repression in AML cells through tissue-specific patterns of promoter binding and epigenetic modifications; CDX2 differentially regulates KLF4 in AML versus colon cancer cells; PPARγ agonists de-repress KLF4 and are preferentially toxic to CDX2+ leukemic cells.\",\n      \"method\": \"ChIP for CDX2 promoter binding; gene expression in CDX2-expressing AML vs. colon cancer cells; PPARγ agonist treatment; functional toxicity assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating differential promoter binding, functional drug-sensitivity assay, single lab\",\n      \"pmids\": [\"23202735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CDX2 is required in Lgr5+ intestinal stem cells (ISCs) for proliferation and long-term production of mature lineages; CDX2 occupancy in ISCs is largely anticipatory (bound before gene activation), and CDX2 both activates and represses direct ISC targets—distinct from its predominantly activating role in villus cells.\",\n      \"method\": \"RNA sequencing of Lgr5+ ISCs vs. villus cells; CDX2-specific deletion in Lgr5+ ISCs; ChIP-seq for CDX2 binding in ISCs; mRNA profiling of control vs. Cdx2−/− ISCs\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — conditional KO with specific proliferation phenotype plus genome-wide ChIP-seq and mRNA profiling; multiple orthogonal methods in one study\",\n      \"pmids\": [\"26489894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cdx2 cooperates with Foxa2 and Nkx2-1 to suppress the metastatic program in lung adenocarcinoma; simultaneous knockdown of all three transcription factors is sufficient to promote metastatic potential of non-metastatic cells, including up-regulation of invadopodia component Tks5long, Hmga2, and Snail.\",\n      \"method\": \"ShRNA knockdown of Cdx2/Foxa2/Nkx2-1 alone and in combination; in vivo metastasis assays; gene expression profiling; genetically engineered mouse model\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combinatorial in vivo knockdown with defined metastatic phenotype and gene expression changes; single study\",\n      \"pmids\": [\"26341558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Gastric expression of Cdx2 alone is sufficient to induce intestinal metaplasia (alcian blue-positive goblet cells and intestine-specific gene expression) in transgenic mice, establishing a causal role for Cdx2 in intestinal transdifferentiation of the stomach.\",\n      \"method\": \"Foxa3/Cdx2 transgenic mice directing Cdx2 to gastric mucosa; histological and gene expression analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic gain-of-function with histological and molecular validation; replicated conceptually across multiple subsequent studies\",\n      \"pmids\": [\"11875002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CDX2 silencing in colon cancer operates through a dominant trans-acting repression mechanism rather than DNA methylation or histone deacetylation; somatic cell hybrids between CDX2-expressing and CDX2-negative lines all showed reduced CDX2, indicating a dominant repressor pathway; a ~9.5-kb 5'-flanking region contains key cis-elements for CDX2 transcription; restoration of CDX2 suppresses proliferation and soft agar growth in HT-29 cells.\",\n      \"method\": \"Nuclear run-off assays; 5-aza-dC and TSA treatment; somatic cell hybrid fusions; CDX2 expression restoration in CDX2-negative HT-29; soft agar assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mechanistic approaches (nuclear run-off, hybrid repression, 5'-flanking region analysis, functional rescue); single lab\",\n      \"pmids\": [\"12947088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cdx2 expression is reduced during wound healing by transcription factors Snail and Slug (epithelial-mesenchymal transition factors), which can repress Cdx2 transcription; forced Cdx2 expression retards wound repair and reduces migration in colon cancer cell lines; Cdx2 RNA interference enhances migration; forced Cdx2 expression opposes tumor cell spreading in vivo (nude mouse xenografts).\",\n      \"method\": \"In vitro wound healing assays; RNA interference; forced expression; in vivo xenograft at three sites\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with migration/invasion readouts; identification of upstream repressors Snail/Slug; single lab\",\n      \"pmids\": [\"17599044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AMPK enhances CDX2 expression via epigenetic mechanisms: AMPK inactivation is associated with PRC2-mediated enrichment of repressive H3K27me3 and LSD1-mediated reduction of permissive H3K4me3 at the Cdx2 promoter; CDX2 deficiency abolishes intestinal differentiation promoted by AMPK; epithelial AMPK knockout in vivo reduces CDX2 expression and impairs barrier function.\",\n      \"method\": \"AMPK activator/dominant-negative mutant transfection in Caco-2; ChIP for H3K27me3 and H3K4me3 at Cdx2 promoter; epithelial AMPK conditional KO mouse; transepithelial resistance/FITC-dextran permeability assays\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for histone marks plus conditional KO in vivo plus multiple functional readouts; single lab with several orthogonal methods\",\n      \"pmids\": [\"28234358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"miR-9 directly targets the 3'-UTR of CDX2 mRNA to down-regulate CDX2 protein expression; miR-9 overexpression reduces CDX2 protein and its downstream targets (p21, MUC2, TFF3), while miR-9 knockdown restores CDX2 and inhibits cell growth via G1 arrest in gastric cancer cells.\",\n      \"method\": \"Luciferase reporter with CDX2 3'-UTR; pre-miR-9 transfection; anti-miR-9 knockdown; miR-9 and CDX2 protein correlation in cell lines and primary tissues\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'UTR reporter assay plus gain/loss-of-function with multiple downstream readouts; single lab\",\n      \"pmids\": [\"21225631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The BMP/SMAD pathway (activated by H. pylori infection) upregulates CDX2 expression while downregulating SOX2 in gastric cells; SMAD4 knockdown impairs these effects; infected mice show BMP pathway upregulation, focal Cdx2 expression, and decreased Sox2; proximity ligation assay confirms SMAD protein interactions.\",\n      \"method\": \"Co-culture of AGS cells with H. pylori or BMP2; SMAD4 knockdown; proximity ligation assay; qPCR and western blot; immunohistochemistry in H. pylori-infected mice\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo evidence with pathway perturbation (SMAD4 KD) and protein interaction assay; single lab\",\n      \"pmids\": [\"22791809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cdx2 regulates NLRP3 inflammasome activity through transcriptional activation of TRIM31 (an NLRP3 suppressor); conditional Cdx2 loss reduces TRIM31, leading to elevated NLRP3, increased IL-1β and IL-6; NLRP3 inhibition reduces cytokine levels and extends lifespan of Cdx conditional mutants; TNF-α also activates NF-κB independently of NLRP3 in Cdx mutants.\",\n      \"method\": \"Conditional Cdx knockout mouse; cytokine measurement; NLRP3 inhibitor treatment; TRIM31 target gene validation; in silico analysis of UC patients\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pathway-specific pharmacological rescue, functional cytokine readouts; single lab\",\n      \"pmids\": [\"35985421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"β-catenin signaling directly regulates Cdx2 expression in the dorsal posterior neuropore; conditional β-catenin loss represses Cdx2 and Pax3, leading to spina bifida and tail truncation; Pax3 and Cdx2 are identified as novel Wnt/β-catenin downstream targets; both β-catenin and Pax3 are required for Cdx2 expression in the dorsal PNP.\",\n      \"method\": \"Conditional β-catenin knockout in dorsal neural folds; gene expression analysis; Pax3 transgenic rescue experiment showing partial rescue without restoration of Cdx2\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus transgenic rescue epistasis experiment; single study identifying Cdx2 as downstream of β-catenin\",\n      \"pmids\": [\"24284205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CDX2 loss cooperates with BRAFV600E to drive serrated colorectal tumorigenesis; CDX2Null/BRAFV600E expression in adult mouse intestinal epithelium produces serrated tumors including carcinomas with gastric marker expression; organoids from CDX2Null/BRAFV600E epithelium recapitulate serrated morphology and gene expression.\",\n      \"method\": \"CDX2 conditional knockout combined with BRAFV600E knock-in in mouse intestinal epithelium; organoid culture; gene expression profiling\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo epistasis genetic model with organoid validation; single lab\",\n      \"pmids\": [\"28072391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mosaic intestinal Cdx2 knockout causes metaplastic cells that, without themselves becoming tumorigenic, modify the microenvironment to facilitate tumorigenesis in adjacent Cdx2-intact tumor-prone cells via NF-κB activation, induction of inducible nitric oxide synthase, and stochastic Apc loss of function — a non-cell-autonomous tumor suppressor mechanism.\",\n      \"method\": \"Mosaic conditional Cdx2 knockout in adult intestinal epithelium; NF-κB and iNOS pathway analysis; adjacent cell tumorigenesis assessment\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mosaic KO with defined non-cell-autonomous mechanism and pathway identification; single lab\",\n      \"pmids\": [\"29439001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Bile acids induce Cdx2 expression in gastric epithelial cells through the farnesoid X receptor (FXR); the FXR agonist GW4064 mimics bile acid-induced Cdx2 and MUC2 upregulation, and the FXR antagonist guggulsterone abolishes both effects.\",\n      \"method\": \"RGM-1 gastric epithelial cells treated with CDCA and FXR agonist/antagonist; qPCR and protein level analysis of Cdx2 and MUC2\",\n      \"journal\": \"Journal of clinical biochemistry and nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological gain/loss of FXR function with consistent Cdx2 induction; single lab, single cell line\",\n      \"pmids\": [\"20104269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdx2 overexpression in the small intestine reduces nuclear β-catenin in Paneth cells (without homeotic posteriorization) and alters crypt base organization, suggesting Cdx2 regulates Wnt/β-catenin transcriptional activity in a cell-type-specific manner in the intestinal epithelium.\",\n      \"method\": \"Villin-Cdx2 transgenic mice; immunohistochemistry for β-catenin, lineage markers; gene expression analysis\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic gain-of-function with defined molecular readout (β-catenin nuclear localization); single lab\",\n      \"pmids\": [\"21081128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KAT8-mediated H4K16 acetylation is required for transcriptional activation of CDX2 in trophoblast stem cells; KAT8 knockout reduces H4K16ac at the CDX2 locus, decreasing CDX2 expression and causing TSC self-renewal defects; CDX2 overexpression partially rescues Kat8 KO phenotype; SIRT1 inhibition (EX527) restores H4K16ac and CDX2 levels.\",\n      \"method\": \"Trophoblast-specific Kat8 conditional KO; RNA-seq; CUT&Tag for H4K16ac; CDX2 rescue overexpression; SIRT1 inhibitor EX527 treatment; trophoblast organoids\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — CUT&Tag chromatin profiling plus conditional KO plus epistatic rescue plus pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"38961108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Distinct cis-regulatory elements control Cdx2 expression at different developmental stages: one enhancer regulated by Hippo and Notch signaling is active in blastocyst trophectoderm but inactive in post-implantation extraembryonic structures; additional regulatory elements include a stem-cell-specific sequence active in trophoblast stem cells and a separate element active in post-implantation TE.\",\n      \"method\": \"Comparative analysis of Cdx2 enhancer constructs by reporter transgenic assays in blastocyst, trophoblast stem cells, and post-implantation embryo; CRISPR interference\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic reporter assays across multiple developmental contexts with identification of distinct regulatory elements; single lab\",\n      \"pmids\": [\"27256674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Achaete-scute-like 2 (Ascl2) represses CDX2 transcription by directly binding to the proximal E-box of the CDX2 promoter; Ascl2 knockdown activates CDX2 expression and promotes goblet cell differentiation; Ascl2 overexpression inhibits CDX2 and MUC2 expression.\",\n      \"method\": \"Luciferase reporter assays with CDX2 promoter constructs; ChIP demonstrating Ascl2 binding to CDX2 proximal E-box; siRNA knockdown and overexpression\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assays with gain/loss-of-function; single lab\",\n      \"pmids\": [\"26307678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"JARID1B, an H3K4me3 demethylase, represses CDX2 expression by demethylation of H3K4me3 at the CDX2 locus; CDX2 is a downstream target mediating JARID1B-driven Wnt/β-catenin signaling and colorectal cancer cell proliferation.\",\n      \"method\": \"ChIP for H3K4me3 at CDX2 locus; JARID1B knockdown/overexpression; transcriptome analysis; CDX2 rescue experiments\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus gain/loss-of-function with CDX2 rescue establishing epistasis; single lab\",\n      \"pmids\": [\"33109187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LIN28B directly binds CDX2 mRNA (demonstrated by RNA-binding protein immunoprecipitation, RIP assay) and enhances CDX2 expression post-transcriptionally, promoting CRC differentiation; CDX2 in turn activates AMACR transcription, which enhances intestinal alkaline phosphatase activity via butyric acid upregulation.\",\n      \"method\": \"RNA-binding protein IP (RIP) assay; CDX2 ChIP-seq identifying AMACR as direct target; subcutaneous xenograft and liver metastasis mouse models\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrating direct mRNA binding plus ChIP-seq for CDX2 target identification plus in vivo functional models; single lab\",\n      \"pmids\": [\"33755595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CDX2 enhances trophoblast cell invasiveness by increasing MMP-9 expression and suppressing TIMP-1; PI3K/Akt signaling regulates CDX2 expression in trophoblast cells, as PI3K/Akt inhibition decreases CDX2 levels.\",\n      \"method\": \"CDX2 overexpression in HTR-8/SVneo trophoblast cells; Transwell invasion assays; western blot and qRT-PCR for MMP-9/TIMP-1; PI3K inhibitor treatment\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single overexpression approach with pharmacological inhibitor; no direct binding between CDX2 and MMP-9 promoter demonstrated\",\n      \"pmids\": [\"25171776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDX2 binds the miR-145-5p promoter region and inhibits its transcription, as demonstrated by ChIP; miR-145-5p in turn targets SENP1 3'-UTR to inhibit its translation, establishing a CDX2/miR-145-5p/SENP1 regulatory axis affecting prostate cancer cell invasion and migration.\",\n      \"method\": \"ChIP demonstrating CDX2 binding to miR-145-5p promoter; dual-luciferase reporter for SENP1 3'-UTR; lentiviral miR-145-5p overexpression; invasion/migration Transwell assay\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus luciferase reporter plus functional invasion assays; single lab, novel cellular context (prostate cancer)\",\n      \"pmids\": [\"31249806\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDX2 is a caudal-type homeodomain transcription factor that directly binds CDX-response elements in target gene promoters to activate intestine-specific programs (lactase, LI-cadherin, hephaestin, furin, villin, TFF3, Cdx4, TRIM31, AMACR) and repress pluripotency genes (Oct4, Nanog) in trophectoderm; it recruits the Brm-type SWI/SNF chromatin remodeling complex, responds to upstream signals including Wnt/β-catenin, BMP/SMAD, AMPK (via H3K27me3/H3K4me3 histone modifications), FXR (bile acids), and KAT8 (H4K16ac), while being post-transcriptionally regulated by miR-9 and MEX3A; it controls epithelial cell polarity through endo-lysosomal and apical transport genes (Rab11a, Kif3b), suppresses NF-κB–driven inflammation via COX-2 and NLRP3/TRIM31 pathways, antagonizes cell migration through Snail/Slug-regulated mechanisms, and its context-dependent activity underlies lineage specification in early embryos, intestinal homeostasis, and tumor suppression in the gut.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDX2 is a caudal-type homeodomain transcription factor that binds CDX-response elements to enforce intestinal and trophectoderm identity, with context-dependent activating and repressive functions across early development, gut homeostasis, and tumor suppression [#0, #5, #17]. In the preimplantation embryo, CDX2 acts cell-autonomously downstream of inside/outside positional cues to repress the pluripotency factors Oct4 and Nanog in outer trophectoderm cells, with which it forms a reciprocal cross-repressive circuit; maternal CDX2 mRNA additionally contributes to cell polarization and compaction [#0, #1, #2, #3]. In the gut, CDX2 directly transactivates a battery of intestine-specific genes — LI-cadherin/CDH17, lactase, hephaestin, furin, TFF3, villin, and AMACR — and its gastric expression alone is sufficient to drive intestinal metaplasia [#5, #6, #7, #8, #14, #19, #35]. CDX2 transactivation requires recruitment of the Brm-type SWI/SNF chromatin-remodeling complex through direct protein-protein interaction [#10]. Beyond differentiation genes, CDX2 controls enterocyte apical-basolateral polarity via the direct targets Rab11a and Kif3b, sustains Lgr5+ stem cell proliferation through largely anticipatory chromatin binding, and tunes Wnt/\\u03b2-catenin output by activating APC and AXIN2 [#11, #15, #17]. CDX2 functions as a tumor suppressor in the gut: it restrains NF-\\u03baB-driven inflammation by binding p65 and suppressing COX-2, dampens NLRP3 inflammasome activity through transcriptional activation of TRIM31, and antagonizes migration and metastasis, while its loss cooperates with BRAFV600E to drive serrated tumorigenesis [#13, #21, #25, #27, #28]. CDX2 is itself a tightly regulated node: it is induced by BMP/SMAD, bile-acid/FXR, AMPK, KAT8-mediated H4K16ac, and \\u03b2-catenin signaling, and repressed by miR-9, MEX3A, Ascl2, and the H3K4me3 demethylase JARID1B [#22, #23, #24, #26, #29, #31, #33, #34, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that CDX2 is not merely a marker but a master driver of intestinal identity required showing it could impose that program on a foreign tissue.\",\n      \"evidence\": \"Foxa3-driven Cdx2 transgenic mice directing Cdx2 to gastric mucosa, with histology and gene expression\",\n      \"pmids\": [\"11875002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which direct targets are necessary for metaplasia\", \"Mechanism of cell-of-origin susceptibility not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining how CDX2 executes the intestinal program at the gene level began with identifying direct cis-targets in differentiation genes.\",\n      \"evidence\": \"ChIP, reporter assays, and rapid ligand-regulated CDX2 induction in HT-29 cells for LI-cadherin/CDH17, lactase, hephaestin and furin promoters\",\n      \"pmids\": [\"12404231\", \"10611160\", \"15825077\", \"16239403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactor requirements at individual promoters not initially defined\", \"Hierarchy among targets in driving differentiation unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Understanding why CDX2 is silenced in colon cancer addressed whether loss is epigenetic or genetic and whether restoration is functionally protective.\",\n      \"evidence\": \"Nuclear run-off, 5-aza-dC/TSA treatment, somatic cell hybrids, and CDX2 re-expression with soft-agar assay in HT-29 cells\",\n      \"pmids\": [\"12947088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the dominant trans-acting repressor not determined\", \"In vivo relevance of soft-agar suppression not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Determining the molecular basis of trophectoderm/ICM lineage segregation showed CDX2 is essential to repress pluripotency genes in outer cells.\",\n      \"evidence\": \"Homozygous Cdx2 knockout mouse blastocysts analyzed by immunofluorescence and in situ hybridization\",\n      \"pmids\": [\"15788452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. indirect repression of Oct4/Nanog not resolved here\", \"Upstream positional inputs unaddressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placing CDX2 in the lineage decision hierarchy clarified whether it reads positional information or generates it.\",\n      \"evidence\": \"Chimeric blastocyst analysis with Cdx2 mutant ES cells and live embryo tracking\",\n      \"pmids\": [\"18067887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular nature of the inside/outside signal upstream of CDX2 not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining the reciprocity of the pluripotency-vs-trophectoderm switch showed CDX2 and Nanog mutually repress each other's promoters.\",\n      \"evidence\": \"ChIP, luciferase reporter assays, and conditional TE differentiation ES cell line\",\n      \"pmids\": [\"19564890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors stabilizing the bistable switch not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapping how CDX2 acts in axial patterning and chromatin established direct caudalizing targets and the requirement for a remodeling complex.\",\n      \"evidence\": \"Conditional Cdx2 KO with ChIP for T/Wnt3a/Cyp26a1 and Cdx4; GST pull-down and ChIP showing CDX2-Brm/SWI-SNF recruitment to the villin promoter\",\n      \"pmids\": [\"19906845\", \"20933081\", \"19371634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which SWI/SNF subunit mediates the direct contact not pinpointed\", \"Generality of SWI/SNF dependence across CDX2 targets untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extending CDX2 function beyond gene activation revealed it organizes enterocyte polarity and that maternal mRNA contributes to early polarization.\",\n      \"evidence\": \"Intestine-specific conditional Cdx2 KO with Rab11a/Kif3b suppression recapitulation; maternal+zygotic Cdx2 depletion by dsRNAi/siRNA/morpholino with polarity markers\",\n      \"pmids\": [\"20551175\", \"20430022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a transcription factor coordinates a whole trafficking network mechanistically not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Distinguishing CDX2's stem-cell role from its villus role showed it is required in Lgr5+ ISCs with anticipatory, bifunctional chromatin occupancy.\",\n      \"evidence\": \"ISC-specific Cdx2 deletion, ChIP-seq, and mRNA profiling of Lgr5+ ISCs vs villus cells\",\n      \"pmids\": [\"26489894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Switch determining activation vs repression at bound sites unknown\", \"Partner factors specifying ISC vs villus programs unidentified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Establishing CDX2 as a tumor suppressor in vivo showed its loss cooperates with oncogenic BRAF to drive serrated carcinogenesis.\",\n      \"evidence\": \"CDX2-conditional KO combined with BRAFV600E knock-in in mouse intestine and organoids\",\n      \"pmids\": [\"28072391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct targets mediating serrated phenotype not defined\", \"Whether CDX2 restoration reverses established tumors untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Refining the tumor-suppressor mechanism revealed a non-cell-autonomous mode in which CDX2-null metaplastic cells modify the microenvironment to promote tumorigenesis in neighbors.\",\n      \"evidence\": \"Mosaic conditional Cdx2 KO in adult intestine with NF-\\u03baB/iNOS pathway analysis and adjacent-cell tumorigenesis assessment\",\n      \"pmids\": [\"29439001\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Secreted mediators bridging metaplastic and tumor-prone cells not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connecting CDX2 to inflammasome control identified TRIM31 as the target linking CDX2 loss to NLRP3-driven cytokine release.\",\n      \"evidence\": \"Conditional Cdx KO mouse with TRIM31 target validation, cytokine measurement, and NLRP3 inhibitor rescue\",\n      \"pmids\": [\"35985421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CDX2 occupancy of the TRIM31 promoter not shown here\", \"Relative contribution of NLRP3-independent NF-\\u03baB unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining upstream control of CDX2 in trophoblast stem cells showed KAT8-deposited H4K16ac is required for CDX2 activation, opposed by SIRT1.\",\n      \"evidence\": \"Trophoblast Kat8 conditional KO, CUT&Tag for H4K16ac, CDX2 rescue, and SIRT1 inhibitor EX527 in trophoblast organoids\",\n      \"pmids\": [\"38961108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How KAT8 is recruited to the CDX2 locus not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDX2's anticipatory, bifunctional chromatin binding is switched between activation and repression at individual loci, and which partner factors dictate this in stem cells versus differentiated cells, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of CDX2-cofactor complexes on chromatin\", \"Determinants of activation vs repression at bound sites unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 4, 5, 6, 7, 8, 9, 14, 17, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 6, 8, 9, 37]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3, 5, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 5, 6, 10, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 2, 4, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [20, 27, 28]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 22, 31, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NANOG\", \"RELA\", \"SMARCA2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}