{"gene":"CXXC5","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2008,"finding":"CXXC5 co-localizes with Dishevelled (Dvl) in the cytoplasm and physically interacts with Dvl, as demonstrated by co-immunoprecipitation and FRET experiments. Overexpression of CXXC5 represses the canonical Wnt signaling target Axin2 and attenuates Wnt3a-mediated TOPflash reporter activity; RNAi knockdown of CXXC5 attenuates BMP4-mediated decrease in Axin2 levels, establishing CXXC5 as a BMP4-induced inhibitor of Wnt signaling in neural stem cells.","method":"Co-immunoprecipitation, FRET, TOPflash reporter assay, RNAi knockdown, Axin2 expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus FRET plus functional reporter assays and RNAi in a single focused study, independently replicated in multiple subsequent papers","pmids":["19001364"],"is_preprint":false},{"year":2009,"finding":"CXXC5 (RINF) encodes a nuclear factor containing a CXXC-type zinc-finger motif that is induced by retinoids in acute promyelocytic leukemia cells; shRNA knockdown demonstrates a regulatory function in normal and tumoral myelopoiesis.","method":"Microarray expression profiling, shRNA knockdown, nuclear localization by cell fractionation","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — nuclear localization established by fractionation, functional role by shRNA in primary CD34+ cells, single lab","pmids":["19182210"],"is_preprint":false},{"year":2013,"finding":"CXXC5 is a transcriptional activator of the Flk-1 (VEGFR2) gene; in vitro DNA binding assay showed direct binding of CXXC5 to the Flk-1 promoter region, and mutation of the DNA-binding motif abolished transcriptional activity. BMP4 induces CXXC5 transcription which in turn induces Flk-1; CXXC5 knockdown suppressed BMP4-induced stress fiber formation and migration in HUVECs, and cxxc5 morpholino injection in zebrafish caused caudal vein plexus defects.","method":"In vitro DNA binding assay, promoter-reporter assay, site-directed mutagenesis, siRNA knockdown, morpholino zebrafish model, CXXC5−/− mouse Matrigel angiogenesis assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct DNA binding with mutagenesis, in vivo zebrafish and mouse loss-of-function models, multiple orthogonal methods","pmids":["24136587"],"is_preprint":false},{"year":2013,"finding":"CXXC5 interacts with Smad proteins (Smad3 and Smad4) as shown by co-localization and co-immunoprecipitation; CXXC5 facilitates Smad3 phosphorylation and Smad4 nuclear translocation, and co-expression of Smad with CXXC5 increases TNF-α reporter activity, linking CXXC5 to the extrinsic apoptosis pathway.","method":"FRET, co-immunoprecipitation, nuclear fractionation, caspase activity assay, TUNEL assay, transcription reporter assay, Western blot","journal":"Current molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and FRET for interaction, functional reporter and caspase assays for mechanism, single lab","pmids":["23906331"],"is_preprint":false},{"year":2015,"finding":"CXXC5 negatively regulates osteoblast differentiation and bone formation via a Wnt-dependent interaction with Dvl. CXXC5-deficient mice exhibit elevated bone mineral density; a competitor peptide (PTD-DBM) blocking the CXXC5-Dvl interaction activates the Wnt/β-catenin pathway and accelerates ex vivo calvarial bone growth.","method":"CXXC5−/− mouse bone phenotyping (DEXA, micro-CT), co-immunoprecipitation of CXXC5-Dvl, competitor peptide functional assay, ex vivo calvarial culture","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout phenotype, biochemical interaction, competitor peptide functional validation, multiple orthogonal methods","pmids":["25633194"],"is_preprint":false},{"year":2015,"finding":"CXXC5 acts as a negative feedback regulator of Wnt/β-catenin signaling in skin by interacting with Dvl. CXXC5−/− mice show accelerated cutaneous wound healing with enhanced β-catenin, collagen I, and keratin 14. PTD-DBM competitor peptide disrupts CXXC5-Dvl interaction; co-treatment with PTD-DBM and valproic acid synergistically accelerates wound healing.","method":"CXXC5−/− mouse wound healing model, overexpression/knockdown of CXXC5 in vitro, PTD-DBM competitor peptide, β-catenin/collagen measurements","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse phenotype, in vitro gain/loss-of-function, competitor peptide, multiple orthogonal methods, independent replication of Dvl interaction","pmids":["26056233"],"is_preprint":false},{"year":2015,"finding":"CXXC5 functions as a transcriptional activator of major myelin genes (including MBP) by directly binding the MBP promoter through its CXXC DNA-binding motif. CXXC5−/− mice show severely reduced myelin gene expression in corpus callosum, abnormal myelin structure, and reduced electrical conduction amplitudes.","method":"In vitro DNA binding assay (CXXC5 on MBP promoter), CXXC5−/− mouse myelin phenotyping (qPCR, electron microscopy, electrophysiology), neural stem cell differentiation assays","journal":"Glia","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct DNA binding assay, in vivo knockout with structural and electrophysiological readouts, multiple orthogonal methods","pmids":["26462610"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the mouse Dvl1 PDZ domain (1.76 Å resolution) was determined, and molecular modeling using NMR and X-ray data defined the Dvl1 PDZ domain binding pocket for the CXXC5 peptide, providing structural basis for the CXXC5-Dvl interaction.","method":"X-ray crystallography (1.76 Å resolution), NMR, molecular modeling","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure determination with NMR comparison for Dvl1 PDZ; interaction with CXXC5 peptide defined by modeling, single lab","pmids":["27932247"],"is_preprint":false},{"year":2016,"finding":"Small-molecule inhibitors of the Dvl-CXXC5 interaction were identified and shown to activate the Wnt/β-catenin pathway and enhance osteoblast differentiation. NMR titration confirmed direct binding of compound KY-02061 to the Dvl PDZ domain. Oral administration of KY-02327 rescued bone loss in ovariectomized mice.","method":"Fluorescence polarization in vitro assay (Dvl-CXXC5 disruption), NMR titration, primary osteoblast differentiation assay, ex vivo calvaria culture, OVX mouse model","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — NMR-confirmed direct binding, in vitro functional assay, in vivo OVX model, multiple orthogonal methods","pmids":["26941261"],"is_preprint":false},{"year":2016,"finding":"CXXC5 expression is induced by Wnt/β-catenin signaling and in turn directly binds the MBP promoter to activate myelin gene expression, positioning CXXC5 as part of a Wnt-driven transcriptional program in oligodendrocytes.","method":"Luciferase reporter assay, ChIP/DNA binding assay on MBP promoter, Wnt pathway modulation in neural stem cells","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DNA binding and reporter assays, single lab, confirmed by knockout mouse","pmids":["26462610"],"is_preprint":false},{"year":2016,"finding":"CXXC5 induces H3K9 methylation at the Cd40lg promoter through association with the histone methyltransferase SUV39H1, thereby repressing CD40L expression in CD8+ cytotoxic T cells. ThPOK represses CXXC5 expression, thereby de-repressing CD40L.","method":"Retroviral Thpok transduction, CXXC5 transgene overexpression in T cells, chromatin modification analysis (H3K9me, H3K27me), co-immunoprecipitation of CXXC5 with SUV39H1","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of CXXC5-SUV39H1, gain-of-function and loss-of-function with epigenetic readout, single lab","pmids":["26896487"],"is_preprint":false},{"year":2016,"finding":"CXXC5 expression is regulated by E2-ERα through a direct estrogen response element (ERE) upstream of the CXXC5 translation start codon, establishing CXXC5 as an E2-ERα responsive gene.","method":"ERE-luciferase reporter assay, ERα ChIP, site-directed mutagenesis of ERE, qPCR/Western blot with E2 treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with mutagenesis and ChIP, single lab, clean mechanistic experiment","pmids":["27886276"],"is_preprint":false},{"year":2017,"finding":"CXXC5 recruits DNA demethylase TET2 to maintain hypomethylation of CpG islands within IRF7 and other interferon pathway genes in plasmacytoid dendritic cells (pDCs). Genetic ablation of CXXC5 causes aberrant CpG methylation of the IRF7 gene locus, impairs IRF7 expression, and compromises TLR7/9- and virus-induced IFN response. This positions CXXC5 as an epigenetic regulator that anchors TET2 at specific CGIs.","method":"CXXC5 knockout mouse, bisulfite sequencing/methylation analysis of Irf7 CGI, TET2 recruitment assay (ChIP), IFN response assays, viral challenge model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout, DNA methylation mapping, TET2 recruitment ChIP, functional IFN/viral challenge readouts, multiple orthogonal methods","pmids":["28416650"],"is_preprint":false},{"year":2017,"finding":"CXXC5 is a negative regulator of the Wnt/β-catenin pathway in hair follicles via interaction with Dvl. CXXC5 is upregulated in miniaturized follicles in human balding scalps. CXXC5 inhibits alkaline phosphatase activity and cell proliferation in human hair follicle dermal papilla cells; CXXC5−/− mice show accelerated hair regrowth; disrupting the CXXC5-Dvl interaction with PTD-DBM peptide activates Wnt/β-catenin and accelerates hair regrowth and wound-induced hair neogenesis.","method":"CXXC5−/− mouse hair regrowth model, wound-induced hair neogenesis model, PTD-DBM competitor peptide treatment, alkaline phosphatase activity assay, cell proliferation assay in dermal papilla cells","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse phenotype, human cell functional assays, competitor peptide, multiple independent readouts","pmids":["28595998"],"is_preprint":false},{"year":2018,"finding":"CXXC5 is a novel TGF-β target gene; knockdown of CXXC5 attenuates expression of a substantial portion of TGF-β target genes and ameliorates TGF-β-induced growth inhibition and apoptosis. CXXC5 associates with HDAC1 and competes with HDAC1 for interaction with Smad2/3, thereby abolishing the inhibitory effect of HDAC1 on TGF-β signaling.","method":"RNA-Seq identification of TGF-β target genes, CXXC5 knockdown, co-immunoprecipitation of CXXC5 with HDAC1 and Smad2/3, competition assay, cell growth/apoptosis assays","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of CXXC5-HDAC1-Smad2/3 complex, competition assay, loss-of-function with transcriptomic and functional readouts, multiple orthogonal methods","pmids":["29036306"],"is_preprint":false},{"year":2019,"finding":"Rinf (CXXC5) binds to the chromatin at promoters and enhancers of Tet1, Tet2, and pluripotency genes in mouse ESCs, where it forms a complex with Nanog, Oct4, Tet1, and Tet2, and facilitates their recruitment to regulatory regions. Rinf deficiency reduces expression of pluripotency factors and Tet enzymes and causes aberrant differentiation.","method":"ChIP-seq (Rinf occupancy), Co-immunoprecipitation (Rinf with Nanog, Oct4, Tet1, Tet2), Rinf KO mouse ESCs, RNA-seq, differentiation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus Co-IP plus KO ESC functional assays, multiple orthogonal methods in a single rigorous study","pmids":["31433977"],"is_preprint":false},{"year":2019,"finding":"CXXC5 (RINF) mediates growth plate senescence via suppression of Wnt/β-catenin signaling through its interaction with Dvl. Cxxc5−/− mice show delayed growth plate senescence and tibial elongation. Indirubin analog KY19382, identified by an in vitro CXXC5-DVL interaction screening assay, disrupts this interaction and elongates tibial length.","method":"Cxxc5−/− mouse growth plate analysis, in vitro CXXC5-DVL interaction screening assay, tibial length measurement, growth plate histology","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse phenotype and in vitro interaction screen, single lab","pmids":["30971423"],"is_preprint":false},{"year":2019,"finding":"CXXC5 plays a zebrafish cardiac looping role via TGF-β signaling; zebrafish CXXC5 interacts with SMAD through its ZF-CXXC domain and SMAD MH1 domain. Overexpression of CXXC5 increases TGF-β luciferase reporter activity; cxxc5 morpholino knockdown causes cardiac looping defects rescued by hand2 mRNA co-injection.","method":"Co-immunoprecipitation (CXXC5-SMAD domain interaction), TGF-β luciferase reporter assay, zebrafish morpholino knockdown, mRNA rescue experiment","journal":"International journal of cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction, reporter assay, morpholino with mRNA rescue, single lab","pmids":["27077543"],"is_preprint":false},{"year":2020,"finding":"CXXC5 was verified by recombinant protein generation to directly bind unmethylated CpG dinucleotides. Despite this DNA-binding capacity, CXXC5 lacks intrinsic transcription activation/repression function but participates in E2-driven cellular proliferation by modulating expression of distinct and mutual genes regulated by E2.","method":"Recombinant CXXC5 protein production, in vitro unmethylated CpG binding assay, transcription activation/repression reporter assays (negative for intrinsic activity), gene expression profiling with CXXC5 overexpression/knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — biochemical binding assay with recombinant protein, reporter assays, single lab","pmids":["32249801"],"is_preprint":false},{"year":2020,"finding":"Cxxc5 expression affects cell cycle and myeloid differentiation of mouse HSCs: knockdown reduces monocyte and increases granulocyte development; Cxxc5 knockdown increases S-phase fraction and proliferation, whereas overexpression decreases S-phase fraction; RNA-seq identified upregulation of cell cycle regulators after knockdown.","method":"shRNA knockdown and lentiviral overexpression in mouse LSK cells, flow cytometry cell cycle analysis, ex vivo myeloid differentiation, RNA-seq, single-cell RNA-seq","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with cell cycle and differentiation readouts, RNA-seq, single lab","pmids":["32083332"],"is_preprint":false},{"year":2021,"finding":"CXXC5 binds the proximal MYCL1 promoter and represses MYCL1 transcription in quiescent hepatic stellate cells (HSCs). Loss of CXXC5 during HSC activation removes CpG methylation and acquires acetylated H3K9/H3K27 at the MYCL1 promoter, leading to MYCL1 transactivation and HSC activation. MYCL1 knockdown attenuates HSC activation; MYCL1 overexpression partially relieves CXXC5-mediated blockade.","method":"ChIP (CXXC5 on MYCL1 promoter), bisulfite sequencing, histone modification analysis, CXXC5 overexpression/knockout, RNA-seq, MYCL1 knockdown/overexpression functional assays","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP, DNA methylation analysis, histone modification, gain/loss-of-function with epistasis rescue, multiple orthogonal methods","pmids":["34621736"],"is_preprint":false},{"year":2021,"finding":"Proximity-dependent biotinylation (BioID) mapping identified CXXC5 interaction partners including DNA/chromatin modifiers, transcription factors/co-regulators, and RNA processors. CXXC5 interacts through its CXXC domain with EMD, MAZ, and MeCP2; interplay between CXXC5 and MeCP2 was critical for a subset of CXXC5 target gene expressions.","method":"BioID proximity biotinylation, sequential immunoprecipitation coupled to mass spectrometry, domain-interaction mapping, gene expression analysis of CXXC5/MeCP2 co-regulated genes","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BioID + MS interactome, domain interaction, functional gene expression validation, single lab","pmids":["34475492"],"is_preprint":false},{"year":2022,"finding":"RINF (CXXC5) upregulates SMAD7 expression by direct binding to the SMAD7 promoter in immature erythroid cells, maintaining SMAD7 levels to fine-tune TGF-β sensitivity. RINF knockdown accelerates erythropoietin-driven maturation and reduces RBC numbers (~45%); ectopic SMAD7 expression rescues the RINF knockdown phenotype. RINF silencing also affects 5'-hydroxymethylation of erythroblasts, consistent with a Tet2-anchoring role.","method":"RINF shRNA knockdown in primary human CD34+ cells, promoter binding (ChIP), ectopic SMAD7 rescue experiment, 5-hydroxymethylcytosine profiling, erythroid differentiation assays","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP of CXXC5 on SMAD7 promoter, genetic rescue with SMAD7, primary human cells and patient samples, multiple orthogonal methods","pmids":["33241676"],"is_preprint":false},{"year":2022,"finding":"Idax and Rinf (CXXC5) facilitate expression of Tet enzymes to promote neural and suppress trophectoderm programs during ESC differentiation. Individual or combined loss of Idax and Rinf in ESCs downregulates Tet genes (direct targets) and neural markers, and upregulates trophectoderm markers. DKO embryos have reduced NPC markers in forebrain and deregulated trophoblast markers in placenta.","method":"Single and double knockout ESCs, directed differentiation to NPCs and trophoblast-like cells, DKO mouse embryo analysis (NPC/trophoblast markers), qPCR/Western blot","journal":"Stem cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockouts in ESCs and in vivo embryos, pathway epistasis, single lab","pmids":["35390758"],"is_preprint":false},{"year":2022,"finding":"CXXC5 interacts with the CRL4B and NuRD complexes and the CXXC5-CRL4B-NuRD complex mediates transcriptional repression of TSC1 and other genes, activating mTOR signaling and PD-L1 expression in breast cancer. ChIP-seq defined direct transcriptional targets of this complex.","method":"Co-immunoprecipitation (CXXC5 with CRL4B and NuRD components), ChIP-seq, loss-of-function (knockdown) and overexpression, in vitro proliferation and in vivo xenograft assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of multi-protein complex, ChIP-seq, in vitro and in vivo functional validation, single lab","pmids":["36539038"],"is_preprint":false},{"year":2022,"finding":"BMP signaling promotes exit of DIPG tumor cells from a stem-cell-like state to differentiation by epigenetically regulating CXXC5, which acts as a tumor suppressor and positive regulator of BMP signaling in H3.3K27M/ACVR1-WT DIPG.","method":"BMP ligand treatment, CXXC5 gain/loss-of-function in DIPG cells, epigenetic profiling, SMAD-dependent reporter assays, in vivo DIPG models","journal":"Nature cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with epigenetic and functional readouts in disease-relevant model, single lab","pmids":["35915262"],"is_preprint":false},{"year":2024,"finding":"CXXC5 extensively co-localizes with TET1 and TET2 at CpG islands in mouse ES cells and interacts with 5-methylcytosine oxidases (TET proteins). CXXC5 knockout leads to substantial genome-wide DNA hypomethylation affecting all genomic compartments, consistent with a model in which CXXC5 anchors TET proteins at CpG islands and in its absence TET enzymes induce genome-scale demethylation.","method":"CXXC5 knockout (gene editing), whole-genome bisulfite sequencing, co-localization analysis of CXXC5 with TET1/TET2 (ChIP), RNA-seq","journal":"Epigenomics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — knockout with genome-wide bisulfite sequencing plus ChIP co-localization, multiple orthogonal methods demonstrating mechanistic role in DNA methylation maintenance","pmids":["39585161"],"is_preprint":false},{"year":2024,"finding":"CXXC5 drives ovarian cancer cell proliferation via transcriptional activation of ZNF143 and EGR1 downstream transcription factors. CXXC5 expression is directly regulated by HIF1A (hypoxia). Loss of CXXC5 inactivates multiple inflammatory signaling pathways; in vitro and in vivo experiments confirmed ZNF143 and EGR1 as downstream transcriptional targets mediating CXXC5's proliferative effects.","method":"CXXC5 knockdown/overexpression, HIF1A ChIP (CXXC5 promoter), downstream target gene expression (ZNF143, EGR1), in vitro proliferation assays, in vivo xenograft","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating HIF1A regulation of CXXC5, gain/loss-of-function with downstream target identification, single lab","pmids":["38642782"],"is_preprint":false},{"year":2025,"finding":"CXXC5 protein is regulated post-translationally by ubiquitination and degraded via the ubiquitin-proteasome pathway. Specific ubiquitinated lysine residues of CXXC5 were identified by bioUbiquitination approach followed by sequential immunoprecipitation coupled to mass spectrometry; these lysine residues contribute to CXXC5 degradation in MCF-7 and HEK293FT cells. E2 augments CXXC5 transcription and synthesis in the G1 phase, but protein levels are primarily controlled by ubiquitination independently of cell cycle phase.","method":"BioUbiquitination approach (cellular biotinylation of ubiquitin), sequential immunoprecipitation coupled mass spectrometry, cell synchronization, cycloheximide chase, proteasome inhibitor treatment, Western blot","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct identification of ubiquitinated lysine residues by mass spectrometry, biochemical validation in two cell lines, single lab but multiple orthogonal methods","pmids":["40371716"],"is_preprint":false}],"current_model":"CXXC5 is a nuclear zinc-finger CXXC protein that binds unmethylated CpG dinucleotides and functions as a context-dependent transcription factor, epigenetic scaffold, and signaling integrator: in the cytoplasm it interacts with Dishevelled (Dvl) to act as a negative-feedback inhibitor of Wnt/β-catenin signaling; in the nucleus it recruits TET enzymes (TET1/TET2) to CpG islands to stabilize DNA methylation patterns, directly activates or represses specific gene promoters (e.g., Flk-1, MBP, SMAD7, MYCL1), associates with HDAC1 to modulate TGF-β/Smad signaling, forms a complex with CRL4B-NuRD to repress TSC1/mTOR targets, and is itself regulated by BMP4, TGF-β, E2-ERα, retinoids, and HIF1A signaling; CXXC5 protein stability is controlled by ubiquitination and proteasomal degradation."},"narrative":{"mechanistic_narrative":"CXXC5 is a CXXC-type zinc-finger protein that binds unmethylated CpG dinucleotides and acts as a context-dependent integrator of developmental signaling, partitioning between a cytoplasmic role in Wnt regulation and a nuclear role in epigenetic and transcriptional control [PMID:19001364, PMID:32249801, PMID:39585161]. In the cytoplasm it binds the PDZ domain of Dishevelled (Dvl) and serves as a negative-feedback inhibitor of canonical Wnt/β-catenin signaling, repressing targets such as Axin2; this interaction is structurally defined and pharmacologically tractable, as competitor peptides (PTD-DBM) and small molecules disrupting the CXXC5-Dvl interface reactivate Wnt signaling [PMID:19001364, PMID:27932247, PMID:26941261]. Through this axis CXXC5 restrains osteoblast differentiation and bone mineral density, cutaneous wound healing, hair follicle regeneration, and growth-plate elongation, with loss-of-function or interface disruption consistently de-repressing these regenerative programs [PMID:25633194, PMID:26056233, PMID:28595998, PMID:30971423]. In the nucleus, CXXC5 occupies CpG islands and anchors the 5-methylcytosine oxidases TET1 and TET2, and its loss causes genome-wide DNA hypomethylation; this anchoring stabilizes methylation at specific loci such as the Irf7 island required for the pDC interferon response [PMID:28416650, PMID:39585161]. CXXC5 also nucleates transcriptional programs by binding chromatin together with pluripotency factors Nanog and Oct4 to drive Tet and neural gene expression in ES cells, and by directly binding and regulating defined promoters including Flk-1/VEGFR2, MBP, SMAD7, and MYCL1 [PMID:24136587, PMID:26462610, PMID:31433977, PMID:34621736, PMID:33241676]. It modulates TGF-β/Smad signaling by competing with HDAC1 for Smad2/3 binding and partners with the CRL4B-NuRD complex to repress TSC1 and activate mTOR/PD-L1 in cancer [PMID:29036306, PMID:36539038]. CXXC5 itself is a downstream target of BMP4, TGF-β, retinoid, E2-ERα, and HIF1A signaling, and its protein level is set by ubiquitin-proteasome–mediated degradation at defined lysine residues [PMID:27886276, PMID:29036306, PMID:38642782, PMID:40371716].","teleology":[{"year":2008,"claim":"Established CXXC5's first defined molecular role: a cytoplasmic Dvl-binding negative-feedback inhibitor of Wnt signaling induced downstream of BMP4.","evidence":"Co-IP, FRET, TOPflash reporter and RNAi in neural stem cells","pmids":["19001364"],"confidence":"High","gaps":["Did not define the structural basis of the CXXC5-Dvl interaction","Nuclear functions not yet addressed"]},{"year":2009,"claim":"Identified CXXC5 (RINF) as a retinoid-inducible nuclear CXXC zinc-finger factor with a regulatory role in myelopoiesis, anchoring it to hematopoietic differentiation.","evidence":"Microarray profiling, shRNA knockdown and cell fractionation in APL/CD34+ cells","pmids":["19182210"],"confidence":"Medium","gaps":["No direct DNA targets defined","Mechanism of transcriptional action unknown"]},{"year":2013,"claim":"Demonstrated CXXC5 is a sequence-specific transcriptional activator and a TGF-β/Smad-associated factor, expanding its role from Wnt inhibitor to direct gene regulator.","evidence":"In vitro DNA binding with mutagenesis on Flk-1 promoter, zebrafish/mouse loss-of-function (Flk-1); Co-IP/FRET with Smad3/4 and reporter assays (apoptosis)","pmids":["24136587","23906331"],"confidence":"High","gaps":["Whether DNA binding requires cofactors not resolved","Smad-interaction stoichiometry and direct vs indirect effect unclear"]},{"year":2015,"claim":"Knockout mice converted the Wnt-inhibitor model into in vivo physiology, showing CXXC5 restrains bone formation, wound healing and myelination, and is a direct activator of myelin genes.","evidence":"CXXC5−/− bone (DEXA/micro-CT), skin wound and myelin (EM/electrophysiology) phenotyping, PTD-DBM competitor peptide, MBP promoter binding","pmids":["25633194","26056233","26462610"],"confidence":"High","gaps":["Tissue-specific contribution of cytoplasmic vs nuclear pools not separated","How CXXC5 switches between repressor and activator unresolved"]},{"year":2016,"claim":"Defined the CXXC5-Dvl interface structurally and chemically, validating it as a druggable Wnt-activating target, and broadened CXXC5's epigenetic and regulatory repertoire.","evidence":"Dvl1 PDZ crystal structure + modeling; FP/NMR-validated small molecules with OVX rescue; SUV39H1 Co-IP and H3K9me at Cd40lg; ERE reporter/ChIP for E2-ERα regulation","pmids":["27932247","26941261","26896487","27886276"],"confidence":"High","gaps":["Co-crystal of full CXXC5-Dvl complex not obtained","Generality of SUV39H1 recruitment beyond Cd40lg untested"]},{"year":2017,"claim":"Established CXXC5's nuclear epigenetic function as a TET2-anchoring protein that maintains CpG-island hypomethylation, and confirmed Wnt-inhibitory roles in hair follicles.","evidence":"CXXC5 KO mouse with Irf7 CGI bisulfite/methylation and TET2 ChIP plus IFN/viral challenge; CXXC5−/− hair regrowth and dermal papilla assays with PTD-DBM","pmids":["28416650","28595998"],"confidence":"High","gaps":["Whether TET2 anchoring is genome-wide or locus-restricted not yet shown","Determinants of CXXC5 CGI selectivity unknown"]},{"year":2018,"claim":"Resolved how CXXC5 tunes TGF-β output, showing it is a TGF-β target that competes with HDAC1 for Smad2/3 to relieve HDAC1 inhibition.","evidence":"RNA-seq of TGF-β targets, CXXC5-HDAC1-Smad2/3 Co-IP and competition assay, growth/apoptosis readouts","pmids":["29036306"],"confidence":"High","gaps":["Direct vs scaffold contribution to Smad transcription not separated","Single cell-context tested"]},{"year":2019,"claim":"Placed CXXC5 in pluripotency and TGF-β developmental networks, showing it co-occupies chromatin with Nanog/Oct4/TET1/TET2 and regulates Tet expression, and acts via Smad in cardiac development.","evidence":"ChIP-seq and Co-IP in mouse ESCs with KO differentiation assays; zebrafish ZF-CXXC/SMAD MH1 domain Co-IP, reporter, morpholino with hand2 rescue; Cxxc5−/− growth-plate phenotyping with interaction-screen inhibitor","pmids":["31433977","27077543","30971423"],"confidence":"High","gaps":["Whether CXXC5 recruits or is recruited by pluripotency factors unclear","Direct vs indirect control of Tet loci not fully dissected"]},{"year":2020,"claim":"Confirmed direct unmethylated-CpG binding with recombinant protein while showing CXXC5 lacks intrinsic transcriptional activity, reframing it as a DNA-targeting scaffold; also linked CXXC5 to cell-cycle/myeloid differentiation.","evidence":"Recombinant CXXC5 CpG binding and reporter assays (negative for intrinsic activity); shRNA/overexpression in mouse LSK cells with cell-cycle/scRNA-seq","pmids":["32249801","32083332"],"confidence":"Medium","gaps":["Cofactors conferring activation/repression in cells not enumerated here","Mechanism linking CXXC5 to cell-cycle regulators undefined"]},{"year":2021,"claim":"Mapped the CXXC5 interactome and added a direct epigenetic-repression target, showing CXXC domain-dependent binding to EMD/MAZ/MeCP2 and promoter-level repression of MYCL1 via CpG methylation maintenance.","evidence":"BioID/MS interactome with domain mapping and MeCP2 co-regulation; CXXC5 ChIP, bisulfite and histone-modification analysis on MYCL1 promoter with epistasis rescue in hepatic stellate cells","pmids":["34475492","34621736"],"confidence":"Medium","gaps":["Functional consequence of most interactome partners untested","Generality of MeCP2 interplay beyond subset of genes unknown"]},{"year":2022,"claim":"Extended CXXC5's roles to erythropoiesis, ESC lineage choice, and cancer, defining direct promoter targets (SMAD7) and a repressive CRL4B-NuRD complex driving mTOR/PD-L1.","evidence":"RINF knockdown/SMAD7 ChIP and rescue in CD34+ cells with 5hmC profiling; Idax/Rinf ESC and embryo knockouts on Tet/neural/trophectoderm programs; CXXC5-CRL4B-NuRD Co-IP/ChIP-seq with xenografts; BMP/CXXC5 tumor-suppressor function in DIPG","pmids":["33241676","35390758","36539038","35915262"],"confidence":"High","gaps":["How CXXC5 toggles between TET-anchoring and NuRD-repression complexes unresolved","Context determinants of tumor-suppressor vs oncogenic behavior unclear"]},{"year":2024,"claim":"Cemented CXXC5 as a genome-wide TET-anchoring methylation guardian and identified HIF1A as an upstream regulator driving proliferative cancer programs.","evidence":"CXXC5 KO with whole-genome bisulfite sequencing and TET1/TET2 ChIP co-localization; HIF1A ChIP on CXXC5 promoter with ZNF143/EGR1 downstream targets and xenografts","pmids":["39585161","38642782"],"confidence":"High","gaps":["Why TET loss-of-anchoring causes net hypomethylation mechanistically not fully resolved","Direct vs indirect activation of ZNF143/EGR1 not separated"]},{"year":2025,"claim":"Defined how CXXC5 abundance is set, identifying specific ubiquitinated lysines that drive proteasomal degradation independent of cell-cycle phase.","evidence":"BioUbiquitination + sequential IP-MS, cycloheximide chase, proteasome inhibition and synchronization in MCF-7/HEK293FT","pmids":["40371716"],"confidence":"High","gaps":["The responsible E3 ligase(s) not identified","Whether degradation is signal-regulated (e.g., by Wnt/TGF-β) untested"]},{"year":null,"claim":"It remains unresolved what molecular switch partitions CXXC5 between its cytoplasmic Dvl-bound Wnt-inhibitory pool and its nuclear CpG/TET-anchoring and complex-specific transcriptional pools, and how this dictates activator versus repressor outcomes.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism for cytoplasmic-nuclear partitioning defined","Determinants of complex selection (TET vs NuRD vs HDAC1/Smad) unknown","E3 ligase and signal-coupling of CXXC5 turnover unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,6,18,20,22,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,6,20,22,24,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,14,15,26]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,5,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,15,26]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[15,20,24,26]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,5,14,25]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[10,12,20,24,26]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,6,20,22,24,27]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,6,15,23]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[28]}],"complexes":["CRL4B-NuRD","CXXC5-TET1/TET2 (CpG island)","Nanog-Oct4-Tet1-Tet2"],"partners":["DVL","TET2","TET1","SMAD3","HDAC1","SUV39H1","MECP2","NANOG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7LFL8","full_name":"CXXC-type zinc finger protein 5","aliases":["Putative MAPK-activating protein PM08","Putative NF-kappa-B-activating protein 102","Retinoid-inducible nuclear factor","RINF"],"length_aa":322,"mass_kda":33.0,"function":"May indirectly participate in activation of the NF-kappa-B and MAPK pathways. Acts as a mediator of BMP4-mediated modulation of canonical Wnt signaling activity in neural stem cells (By similarity). Required for DNA damage-induced ATM phosphorylation, p53 activation and cell cycle arrest. Involved in myelopoiesis. Transcription factor. Binds to the oxygen responsive element of COX4I2 and represses its transcription under hypoxia conditions (4% oxygen), as well as normoxia conditions (20% oxygen) (PubMed:23303788). May repress COX4I2 transactivation induced by CHCHD2 and RBPJ (PubMed:23303788). Binds preferentially to DNA containing cytidine-phosphate-guanosine (CpG) dinucleotides over CpH (H=A, T, and C), hemimethylated-CpG and hemimethylated-hydroxymethyl-CpG (PubMed:29276034)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q7LFL8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CXXC5","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CXXC5","total_profiled":1310},"omim":[{"mim_id":"618008","title":"DEVELOPMENTAL AND EPILEPTIC ENCEPHALOPATHY 65; DEE65","url":"https://www.omim.org/entry/618008"},{"mim_id":"616244","title":"COILED-COIL-HELIX-COILED-COIL-HELIX DOMAIN-CONTAINING PROTEIN 2; CHCHD2","url":"https://www.omim.org/entry/616244"},{"mim_id":"612752","title":"CXXC FINGER PROTEIN 5; CXXC5","url":"https://www.omim.org/entry/612752"},{"mim_id":"607976","title":"CYTOCHROME c OXIDASE, SUBUNIT 4I2; COX4I2","url":"https://www.omim.org/entry/607976"},{"mim_id":"147183","title":"RECOMBINATION SIGNAL-BINDING PROTEIN FOR IMMUNOGLOBULIN KAPPA J REGION; RBPJ","url":"https://www.omim.org/entry/147183"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in 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Society","url":"https://pubmed.ncbi.nlm.nih.gov/40371716","citation_count":0,"is_preprint":false},{"pmid":"41609407","id":"PMC_41609407","title":"The cervico-vaginal DNA methylation WID-qEC test: An epigenetic marker associated with ovarian cancer in the absence of endometrial and cervical cancer.","date":"2026","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/41609407","citation_count":0,"is_preprint":false},{"pmid":"40741256","id":"PMC_40741256","title":"MiR-28-3p regulates high glucose-induced endothelial dysfunction by targeting CXXC5.","date":"2023","source":"Archives of medical science : AMS","url":"https://pubmed.ncbi.nlm.nih.gov/40741256","citation_count":0,"is_preprint":false},{"pmid":"32546710","id":"PMC_32546710","title":"Author Correction: CXXC5 as an unmethylated CpG dinucleotide binding protein contributes to estrogen-mediated cellular proliferation.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32546710","citation_count":0,"is_preprint":false},{"pmid":"2511361","id":"PMC_2511361","title":"[Cutaneous lesion of adult T-cell lymphoma treated successfully with local hyperthermia in combination with intravenous administration of rINF-gamma].","date":"1989","source":"Nihon Hifuka Gakkai zasshi. The Japanese journal of dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/2511361","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34234,"output_tokens":8001,"usd":0.111358,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17519,"output_tokens":5323,"usd":0.110335,"stage2_stop_reason":"end_turn"},"total_usd":0.221693,"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\": 2008,\n      \"finding\": \"CXXC5 co-localizes with Dishevelled (Dvl) in the cytoplasm and physically interacts with Dvl, as demonstrated by co-immunoprecipitation and FRET experiments. Overexpression of CXXC5 represses the canonical Wnt signaling target Axin2 and attenuates Wnt3a-mediated TOPflash reporter activity; RNAi knockdown of CXXC5 attenuates BMP4-mediated decrease in Axin2 levels, establishing CXXC5 as a BMP4-induced inhibitor of Wnt signaling in neural stem cells.\",\n      \"method\": \"Co-immunoprecipitation, FRET, TOPflash reporter assay, RNAi knockdown, Axin2 expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus FRET plus functional reporter assays and RNAi in a single focused study, independently replicated in multiple subsequent papers\",\n      \"pmids\": [\"19001364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CXXC5 (RINF) encodes a nuclear factor containing a CXXC-type zinc-finger motif that is induced by retinoids in acute promyelocytic leukemia cells; shRNA knockdown demonstrates a regulatory function in normal and tumoral myelopoiesis.\",\n      \"method\": \"Microarray expression profiling, shRNA knockdown, nuclear localization by cell fractionation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — nuclear localization established by fractionation, functional role by shRNA in primary CD34+ cells, single lab\",\n      \"pmids\": [\"19182210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CXXC5 is a transcriptional activator of the Flk-1 (VEGFR2) gene; in vitro DNA binding assay showed direct binding of CXXC5 to the Flk-1 promoter region, and mutation of the DNA-binding motif abolished transcriptional activity. BMP4 induces CXXC5 transcription which in turn induces Flk-1; CXXC5 knockdown suppressed BMP4-induced stress fiber formation and migration in HUVECs, and cxxc5 morpholino injection in zebrafish caused caudal vein plexus defects.\",\n      \"method\": \"In vitro DNA binding assay, promoter-reporter assay, site-directed mutagenesis, siRNA knockdown, morpholino zebrafish model, CXXC5−/− mouse Matrigel angiogenesis assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct DNA binding with mutagenesis, in vivo zebrafish and mouse loss-of-function models, multiple orthogonal methods\",\n      \"pmids\": [\"24136587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CXXC5 interacts with Smad proteins (Smad3 and Smad4) as shown by co-localization and co-immunoprecipitation; CXXC5 facilitates Smad3 phosphorylation and Smad4 nuclear translocation, and co-expression of Smad with CXXC5 increases TNF-α reporter activity, linking CXXC5 to the extrinsic apoptosis pathway.\",\n      \"method\": \"FRET, co-immunoprecipitation, nuclear fractionation, caspase activity assay, TUNEL assay, transcription reporter assay, Western blot\",\n      \"journal\": \"Current molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and FRET for interaction, functional reporter and caspase assays for mechanism, single lab\",\n      \"pmids\": [\"23906331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CXXC5 negatively regulates osteoblast differentiation and bone formation via a Wnt-dependent interaction with Dvl. CXXC5-deficient mice exhibit elevated bone mineral density; a competitor peptide (PTD-DBM) blocking the CXXC5-Dvl interaction activates the Wnt/β-catenin pathway and accelerates ex vivo calvarial bone growth.\",\n      \"method\": \"CXXC5−/− mouse bone phenotyping (DEXA, micro-CT), co-immunoprecipitation of CXXC5-Dvl, competitor peptide functional assay, ex vivo calvarial culture\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout phenotype, biochemical interaction, competitor peptide functional validation, multiple orthogonal methods\",\n      \"pmids\": [\"25633194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CXXC5 acts as a negative feedback regulator of Wnt/β-catenin signaling in skin by interacting with Dvl. CXXC5−/− mice show accelerated cutaneous wound healing with enhanced β-catenin, collagen I, and keratin 14. PTD-DBM competitor peptide disrupts CXXC5-Dvl interaction; co-treatment with PTD-DBM and valproic acid synergistically accelerates wound healing.\",\n      \"method\": \"CXXC5−/− mouse wound healing model, overexpression/knockdown of CXXC5 in vitro, PTD-DBM competitor peptide, β-catenin/collagen measurements\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse phenotype, in vitro gain/loss-of-function, competitor peptide, multiple orthogonal methods, independent replication of Dvl interaction\",\n      \"pmids\": [\"26056233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CXXC5 functions as a transcriptional activator of major myelin genes (including MBP) by directly binding the MBP promoter through its CXXC DNA-binding motif. CXXC5−/− mice show severely reduced myelin gene expression in corpus callosum, abnormal myelin structure, and reduced electrical conduction amplitudes.\",\n      \"method\": \"In vitro DNA binding assay (CXXC5 on MBP promoter), CXXC5−/− mouse myelin phenotyping (qPCR, electron microscopy, electrophysiology), neural stem cell differentiation assays\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct DNA binding assay, in vivo knockout with structural and electrophysiological readouts, multiple orthogonal methods\",\n      \"pmids\": [\"26462610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the mouse Dvl1 PDZ domain (1.76 Å resolution) was determined, and molecular modeling using NMR and X-ray data defined the Dvl1 PDZ domain binding pocket for the CXXC5 peptide, providing structural basis for the CXXC5-Dvl interaction.\",\n      \"method\": \"X-ray crystallography (1.76 Å resolution), NMR, molecular modeling\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination with NMR comparison for Dvl1 PDZ; interaction with CXXC5 peptide defined by modeling, single lab\",\n      \"pmids\": [\"27932247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Small-molecule inhibitors of the Dvl-CXXC5 interaction were identified and shown to activate the Wnt/β-catenin pathway and enhance osteoblast differentiation. NMR titration confirmed direct binding of compound KY-02061 to the Dvl PDZ domain. Oral administration of KY-02327 rescued bone loss in ovariectomized mice.\",\n      \"method\": \"Fluorescence polarization in vitro assay (Dvl-CXXC5 disruption), NMR titration, primary osteoblast differentiation assay, ex vivo calvaria culture, OVX mouse model\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — NMR-confirmed direct binding, in vitro functional assay, in vivo OVX model, multiple orthogonal methods\",\n      \"pmids\": [\"26941261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CXXC5 expression is induced by Wnt/β-catenin signaling and in turn directly binds the MBP promoter to activate myelin gene expression, positioning CXXC5 as part of a Wnt-driven transcriptional program in oligodendrocytes.\",\n      \"method\": \"Luciferase reporter assay, ChIP/DNA binding assay on MBP promoter, Wnt pathway modulation in neural stem cells\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DNA binding and reporter assays, single lab, confirmed by knockout mouse\",\n      \"pmids\": [\"26462610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CXXC5 induces H3K9 methylation at the Cd40lg promoter through association with the histone methyltransferase SUV39H1, thereby repressing CD40L expression in CD8+ cytotoxic T cells. ThPOK represses CXXC5 expression, thereby de-repressing CD40L.\",\n      \"method\": \"Retroviral Thpok transduction, CXXC5 transgene overexpression in T cells, chromatin modification analysis (H3K9me, H3K27me), co-immunoprecipitation of CXXC5 with SUV39H1\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of CXXC5-SUV39H1, gain-of-function and loss-of-function with epigenetic readout, single lab\",\n      \"pmids\": [\"26896487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CXXC5 expression is regulated by E2-ERα through a direct estrogen response element (ERE) upstream of the CXXC5 translation start codon, establishing CXXC5 as an E2-ERα responsive gene.\",\n      \"method\": \"ERE-luciferase reporter assay, ERα ChIP, site-directed mutagenesis of ERE, qPCR/Western blot with E2 treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with mutagenesis and ChIP, single lab, clean mechanistic experiment\",\n      \"pmids\": [\"27886276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CXXC5 recruits DNA demethylase TET2 to maintain hypomethylation of CpG islands within IRF7 and other interferon pathway genes in plasmacytoid dendritic cells (pDCs). Genetic ablation of CXXC5 causes aberrant CpG methylation of the IRF7 gene locus, impairs IRF7 expression, and compromises TLR7/9- and virus-induced IFN response. This positions CXXC5 as an epigenetic regulator that anchors TET2 at specific CGIs.\",\n      \"method\": \"CXXC5 knockout mouse, bisulfite sequencing/methylation analysis of Irf7 CGI, TET2 recruitment assay (ChIP), IFN response assays, viral challenge model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout, DNA methylation mapping, TET2 recruitment ChIP, functional IFN/viral challenge readouts, multiple orthogonal methods\",\n      \"pmids\": [\"28416650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CXXC5 is a negative regulator of the Wnt/β-catenin pathway in hair follicles via interaction with Dvl. CXXC5 is upregulated in miniaturized follicles in human balding scalps. CXXC5 inhibits alkaline phosphatase activity and cell proliferation in human hair follicle dermal papilla cells; CXXC5−/− mice show accelerated hair regrowth; disrupting the CXXC5-Dvl interaction with PTD-DBM peptide activates Wnt/β-catenin and accelerates hair regrowth and wound-induced hair neogenesis.\",\n      \"method\": \"CXXC5−/− mouse hair regrowth model, wound-induced hair neogenesis model, PTD-DBM competitor peptide treatment, alkaline phosphatase activity assay, cell proliferation assay in dermal papilla cells\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse phenotype, human cell functional assays, competitor peptide, multiple independent readouts\",\n      \"pmids\": [\"28595998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CXXC5 is a novel TGF-β target gene; knockdown of CXXC5 attenuates expression of a substantial portion of TGF-β target genes and ameliorates TGF-β-induced growth inhibition and apoptosis. CXXC5 associates with HDAC1 and competes with HDAC1 for interaction with Smad2/3, thereby abolishing the inhibitory effect of HDAC1 on TGF-β signaling.\",\n      \"method\": \"RNA-Seq identification of TGF-β target genes, CXXC5 knockdown, co-immunoprecipitation of CXXC5 with HDAC1 and Smad2/3, competition assay, cell growth/apoptosis assays\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of CXXC5-HDAC1-Smad2/3 complex, competition assay, loss-of-function with transcriptomic and functional readouts, multiple orthogonal methods\",\n      \"pmids\": [\"29036306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rinf (CXXC5) binds to the chromatin at promoters and enhancers of Tet1, Tet2, and pluripotency genes in mouse ESCs, where it forms a complex with Nanog, Oct4, Tet1, and Tet2, and facilitates their recruitment to regulatory regions. Rinf deficiency reduces expression of pluripotency factors and Tet enzymes and causes aberrant differentiation.\",\n      \"method\": \"ChIP-seq (Rinf occupancy), Co-immunoprecipitation (Rinf with Nanog, Oct4, Tet1, Tet2), Rinf KO mouse ESCs, RNA-seq, differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus Co-IP plus KO ESC functional assays, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"31433977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CXXC5 (RINF) mediates growth plate senescence via suppression of Wnt/β-catenin signaling through its interaction with Dvl. Cxxc5−/− mice show delayed growth plate senescence and tibial elongation. Indirubin analog KY19382, identified by an in vitro CXXC5-DVL interaction screening assay, disrupts this interaction and elongates tibial length.\",\n      \"method\": \"Cxxc5−/− mouse growth plate analysis, in vitro CXXC5-DVL interaction screening assay, tibial length measurement, growth plate histology\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse phenotype and in vitro interaction screen, single lab\",\n      \"pmids\": [\"30971423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CXXC5 plays a zebrafish cardiac looping role via TGF-β signaling; zebrafish CXXC5 interacts with SMAD through its ZF-CXXC domain and SMAD MH1 domain. Overexpression of CXXC5 increases TGF-β luciferase reporter activity; cxxc5 morpholino knockdown causes cardiac looping defects rescued by hand2 mRNA co-injection.\",\n      \"method\": \"Co-immunoprecipitation (CXXC5-SMAD domain interaction), TGF-β luciferase reporter assay, zebrafish morpholino knockdown, mRNA rescue experiment\",\n      \"journal\": \"International journal of cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction, reporter assay, morpholino with mRNA rescue, single lab\",\n      \"pmids\": [\"27077543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CXXC5 was verified by recombinant protein generation to directly bind unmethylated CpG dinucleotides. Despite this DNA-binding capacity, CXXC5 lacks intrinsic transcription activation/repression function but participates in E2-driven cellular proliferation by modulating expression of distinct and mutual genes regulated by E2.\",\n      \"method\": \"Recombinant CXXC5 protein production, in vitro unmethylated CpG binding assay, transcription activation/repression reporter assays (negative for intrinsic activity), gene expression profiling with CXXC5 overexpression/knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical binding assay with recombinant protein, reporter assays, single lab\",\n      \"pmids\": [\"32249801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cxxc5 expression affects cell cycle and myeloid differentiation of mouse HSCs: knockdown reduces monocyte and increases granulocyte development; Cxxc5 knockdown increases S-phase fraction and proliferation, whereas overexpression decreases S-phase fraction; RNA-seq identified upregulation of cell cycle regulators after knockdown.\",\n      \"method\": \"shRNA knockdown and lentiviral overexpression in mouse LSK cells, flow cytometry cell cycle analysis, ex vivo myeloid differentiation, RNA-seq, single-cell RNA-seq\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with cell cycle and differentiation readouts, RNA-seq, single lab\",\n      \"pmids\": [\"32083332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CXXC5 binds the proximal MYCL1 promoter and represses MYCL1 transcription in quiescent hepatic stellate cells (HSCs). Loss of CXXC5 during HSC activation removes CpG methylation and acquires acetylated H3K9/H3K27 at the MYCL1 promoter, leading to MYCL1 transactivation and HSC activation. MYCL1 knockdown attenuates HSC activation; MYCL1 overexpression partially relieves CXXC5-mediated blockade.\",\n      \"method\": \"ChIP (CXXC5 on MYCL1 promoter), bisulfite sequencing, histone modification analysis, CXXC5 overexpression/knockout, RNA-seq, MYCL1 knockdown/overexpression functional assays\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP, DNA methylation analysis, histone modification, gain/loss-of-function with epistasis rescue, multiple orthogonal methods\",\n      \"pmids\": [\"34621736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Proximity-dependent biotinylation (BioID) mapping identified CXXC5 interaction partners including DNA/chromatin modifiers, transcription factors/co-regulators, and RNA processors. CXXC5 interacts through its CXXC domain with EMD, MAZ, and MeCP2; interplay between CXXC5 and MeCP2 was critical for a subset of CXXC5 target gene expressions.\",\n      \"method\": \"BioID proximity biotinylation, sequential immunoprecipitation coupled to mass spectrometry, domain-interaction mapping, gene expression analysis of CXXC5/MeCP2 co-regulated genes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BioID + MS interactome, domain interaction, functional gene expression validation, single lab\",\n      \"pmids\": [\"34475492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RINF (CXXC5) upregulates SMAD7 expression by direct binding to the SMAD7 promoter in immature erythroid cells, maintaining SMAD7 levels to fine-tune TGF-β sensitivity. RINF knockdown accelerates erythropoietin-driven maturation and reduces RBC numbers (~45%); ectopic SMAD7 expression rescues the RINF knockdown phenotype. RINF silencing also affects 5'-hydroxymethylation of erythroblasts, consistent with a Tet2-anchoring role.\",\n      \"method\": \"RINF shRNA knockdown in primary human CD34+ cells, promoter binding (ChIP), ectopic SMAD7 rescue experiment, 5-hydroxymethylcytosine profiling, erythroid differentiation assays\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP of CXXC5 on SMAD7 promoter, genetic rescue with SMAD7, primary human cells and patient samples, multiple orthogonal methods\",\n      \"pmids\": [\"33241676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Idax and Rinf (CXXC5) facilitate expression of Tet enzymes to promote neural and suppress trophectoderm programs during ESC differentiation. Individual or combined loss of Idax and Rinf in ESCs downregulates Tet genes (direct targets) and neural markers, and upregulates trophectoderm markers. DKO embryos have reduced NPC markers in forebrain and deregulated trophoblast markers in placenta.\",\n      \"method\": \"Single and double knockout ESCs, directed differentiation to NPCs and trophoblast-like cells, DKO mouse embryo analysis (NPC/trophoblast markers), qPCR/Western blot\",\n      \"journal\": \"Stem cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockouts in ESCs and in vivo embryos, pathway epistasis, single lab\",\n      \"pmids\": [\"35390758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CXXC5 interacts with the CRL4B and NuRD complexes and the CXXC5-CRL4B-NuRD complex mediates transcriptional repression of TSC1 and other genes, activating mTOR signaling and PD-L1 expression in breast cancer. ChIP-seq defined direct transcriptional targets of this complex.\",\n      \"method\": \"Co-immunoprecipitation (CXXC5 with CRL4B and NuRD components), ChIP-seq, loss-of-function (knockdown) and overexpression, in vitro proliferation and in vivo xenograft assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of multi-protein complex, ChIP-seq, in vitro and in vivo functional validation, single lab\",\n      \"pmids\": [\"36539038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"BMP signaling promotes exit of DIPG tumor cells from a stem-cell-like state to differentiation by epigenetically regulating CXXC5, which acts as a tumor suppressor and positive regulator of BMP signaling in H3.3K27M/ACVR1-WT DIPG.\",\n      \"method\": \"BMP ligand treatment, CXXC5 gain/loss-of-function in DIPG cells, epigenetic profiling, SMAD-dependent reporter assays, in vivo DIPG models\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with epigenetic and functional readouts in disease-relevant model, single lab\",\n      \"pmids\": [\"35915262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CXXC5 extensively co-localizes with TET1 and TET2 at CpG islands in mouse ES cells and interacts with 5-methylcytosine oxidases (TET proteins). CXXC5 knockout leads to substantial genome-wide DNA hypomethylation affecting all genomic compartments, consistent with a model in which CXXC5 anchors TET proteins at CpG islands and in its absence TET enzymes induce genome-scale demethylation.\",\n      \"method\": \"CXXC5 knockout (gene editing), whole-genome bisulfite sequencing, co-localization analysis of CXXC5 with TET1/TET2 (ChIP), RNA-seq\",\n      \"journal\": \"Epigenomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — knockout with genome-wide bisulfite sequencing plus ChIP co-localization, multiple orthogonal methods demonstrating mechanistic role in DNA methylation maintenance\",\n      \"pmids\": [\"39585161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CXXC5 drives ovarian cancer cell proliferation via transcriptional activation of ZNF143 and EGR1 downstream transcription factors. CXXC5 expression is directly regulated by HIF1A (hypoxia). Loss of CXXC5 inactivates multiple inflammatory signaling pathways; in vitro and in vivo experiments confirmed ZNF143 and EGR1 as downstream transcriptional targets mediating CXXC5's proliferative effects.\",\n      \"method\": \"CXXC5 knockdown/overexpression, HIF1A ChIP (CXXC5 promoter), downstream target gene expression (ZNF143, EGR1), in vitro proliferation assays, in vivo xenograft\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating HIF1A regulation of CXXC5, gain/loss-of-function with downstream target identification, single lab\",\n      \"pmids\": [\"38642782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CXXC5 protein is regulated post-translationally by ubiquitination and degraded via the ubiquitin-proteasome pathway. Specific ubiquitinated lysine residues of CXXC5 were identified by bioUbiquitination approach followed by sequential immunoprecipitation coupled to mass spectrometry; these lysine residues contribute to CXXC5 degradation in MCF-7 and HEK293FT cells. E2 augments CXXC5 transcription and synthesis in the G1 phase, but protein levels are primarily controlled by ubiquitination independently of cell cycle phase.\",\n      \"method\": \"BioUbiquitination approach (cellular biotinylation of ubiquitin), sequential immunoprecipitation coupled mass spectrometry, cell synchronization, cycloheximide chase, proteasome inhibitor treatment, Western blot\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct identification of ubiquitinated lysine residues by mass spectrometry, biochemical validation in two cell lines, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40371716\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CXXC5 is a nuclear zinc-finger CXXC protein that binds unmethylated CpG dinucleotides and functions as a context-dependent transcription factor, epigenetic scaffold, and signaling integrator: in the cytoplasm it interacts with Dishevelled (Dvl) to act as a negative-feedback inhibitor of Wnt/β-catenin signaling; in the nucleus it recruits TET enzymes (TET1/TET2) to CpG islands to stabilize DNA methylation patterns, directly activates or represses specific gene promoters (e.g., Flk-1, MBP, SMAD7, MYCL1), associates with HDAC1 to modulate TGF-β/Smad signaling, forms a complex with CRL4B-NuRD to repress TSC1/mTOR targets, and is itself regulated by BMP4, TGF-β, E2-ERα, retinoids, and HIF1A signaling; CXXC5 protein stability is controlled by ubiquitination and proteasomal degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CXXC5 is a CXXC-type zinc-finger protein that binds unmethylated CpG dinucleotides and acts as a context-dependent integrator of developmental signaling, partitioning between a cytoplasmic role in Wnt regulation and a nuclear role in epigenetic and transcriptional control [#0, #18, #26]. In the cytoplasm it binds the PDZ domain of Dishevelled (Dvl) and serves as a negative-feedback inhibitor of canonical Wnt/\\u03b2-catenin signaling, repressing targets such as Axin2; this interaction is structurally defined and pharmacologically tractable, as competitor peptides (PTD-DBM) and small molecules disrupting the CXXC5-Dvl interface reactivate Wnt signaling [#0, #7, #8]. Through this axis CXXC5 restrains osteoblast differentiation and bone mineral density, cutaneous wound healing, hair follicle regeneration, and growth-plate elongation, with loss-of-function or interface disruption consistently de-repressing these regenerative programs [#4, #5, #13, #16]. In the nucleus, CXXC5 occupies CpG islands and anchors the 5-methylcytosine oxidases TET1 and TET2, and its loss causes genome-wide DNA hypomethylation; this anchoring stabilizes methylation at specific loci such as the Irf7 island required for the pDC interferon response [#12, #26]. CXXC5 also nucleates transcriptional programs by binding chromatin together with pluripotency factors Nanog and Oct4 to drive Tet and neural gene expression in ES cells, and by directly binding and regulating defined promoters including Flk-1/VEGFR2, MBP, SMAD7, and MYCL1 [#2, #6, #15, #20, #22]. It modulates TGF-\\u03b2/Smad signaling by competing with HDAC1 for Smad2/3 binding and partners with the CRL4B-NuRD complex to repress TSC1 and activate mTOR/PD-L1 in cancer [#14, #24]. CXXC5 itself is a downstream target of BMP4, TGF-\\u03b2, retinoid, E2-ER\\u03b1, and HIF1A signaling, and its protein level is set by ubiquitin-proteasome\\u2013mediated degradation at defined lysine residues [#11, #14, #27, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established CXXC5's first defined molecular role: a cytoplasmic Dvl-binding negative-feedback inhibitor of Wnt signaling induced downstream of BMP4.\",\n      \"evidence\": \"Co-IP, FRET, TOPflash reporter and RNAi in neural stem cells\",\n      \"pmids\": [\"19001364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the structural basis of the CXXC5-Dvl interaction\", \"Nuclear functions not yet addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified CXXC5 (RINF) as a retinoid-inducible nuclear CXXC zinc-finger factor with a regulatory role in myelopoiesis, anchoring it to hematopoietic differentiation.\",\n      \"evidence\": \"Microarray profiling, shRNA knockdown and cell fractionation in APL/CD34+ cells\",\n      \"pmids\": [\"19182210\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct DNA targets defined\", \"Mechanism of transcriptional action unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated CXXC5 is a sequence-specific transcriptional activator and a TGF-\\u03b2/Smad-associated factor, expanding its role from Wnt inhibitor to direct gene regulator.\",\n      \"evidence\": \"In vitro DNA binding with mutagenesis on Flk-1 promoter, zebrafish/mouse loss-of-function (Flk-1); Co-IP/FRET with Smad3/4 and reporter assays (apoptosis)\",\n      \"pmids\": [\"24136587\", \"23906331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DNA binding requires cofactors not resolved\", \"Smad-interaction stoichiometry and direct vs indirect effect unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Knockout mice converted the Wnt-inhibitor model into in vivo physiology, showing CXXC5 restrains bone formation, wound healing and myelination, and is a direct activator of myelin genes.\",\n      \"evidence\": \"CXXC5\\u2212/\\u2212 bone (DEXA/micro-CT), skin wound and myelin (EM/electrophysiology) phenotyping, PTD-DBM competitor peptide, MBP promoter binding\",\n      \"pmids\": [\"25633194\", \"26056233\", \"26462610\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contribution of cytoplasmic vs nuclear pools not separated\", \"How CXXC5 switches between repressor and activator unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the CXXC5-Dvl interface structurally and chemically, validating it as a druggable Wnt-activating target, and broadened CXXC5's epigenetic and regulatory repertoire.\",\n      \"evidence\": \"Dvl1 PDZ crystal structure + modeling; FP/NMR-validated small molecules with OVX rescue; SUV39H1 Co-IP and H3K9me at Cd40lg; ERE reporter/ChIP for E2-ER\\u03b1 regulation\",\n      \"pmids\": [\"27932247\", \"26941261\", \"26896487\", \"27886276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-crystal of full CXXC5-Dvl complex not obtained\", \"Generality of SUV39H1 recruitment beyond Cd40lg untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established CXXC5's nuclear epigenetic function as a TET2-anchoring protein that maintains CpG-island hypomethylation, and confirmed Wnt-inhibitory roles in hair follicles.\",\n      \"evidence\": \"CXXC5 KO mouse with Irf7 CGI bisulfite/methylation and TET2 ChIP plus IFN/viral challenge; CXXC5\\u2212/\\u2212 hair regrowth and dermal papilla assays with PTD-DBM\",\n      \"pmids\": [\"28416650\", \"28595998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TET2 anchoring is genome-wide or locus-restricted not yet shown\", \"Determinants of CXXC5 CGI selectivity unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved how CXXC5 tunes TGF-\\u03b2 output, showing it is a TGF-\\u03b2 target that competes with HDAC1 for Smad2/3 to relieve HDAC1 inhibition.\",\n      \"evidence\": \"RNA-seq of TGF-\\u03b2 targets, CXXC5-HDAC1-Smad2/3 Co-IP and competition assay, growth/apoptosis readouts\",\n      \"pmids\": [\"29036306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs scaffold contribution to Smad transcription not separated\", \"Single cell-context tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed CXXC5 in pluripotency and TGF-\\u03b2 developmental networks, showing it co-occupies chromatin with Nanog/Oct4/TET1/TET2 and regulates Tet expression, and acts via Smad in cardiac development.\",\n      \"evidence\": \"ChIP-seq and Co-IP in mouse ESCs with KO differentiation assays; zebrafish ZF-CXXC/SMAD MH1 domain Co-IP, reporter, morpholino with hand2 rescue; Cxxc5\\u2212/\\u2212 growth-plate phenotyping with interaction-screen inhibitor\",\n      \"pmids\": [\"31433977\", \"27077543\", \"30971423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CXXC5 recruits or is recruited by pluripotency factors unclear\", \"Direct vs indirect control of Tet loci not fully dissected\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed direct unmethylated-CpG binding with recombinant protein while showing CXXC5 lacks intrinsic transcriptional activity, reframing it as a DNA-targeting scaffold; also linked CXXC5 to cell-cycle/myeloid differentiation.\",\n      \"evidence\": \"Recombinant CXXC5 CpG binding and reporter assays (negative for intrinsic activity); shRNA/overexpression in mouse LSK cells with cell-cycle/scRNA-seq\",\n      \"pmids\": [\"32249801\", \"32083332\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cofactors conferring activation/repression in cells not enumerated here\", \"Mechanism linking CXXC5 to cell-cycle regulators undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped the CXXC5 interactome and added a direct epigenetic-repression target, showing CXXC domain-dependent binding to EMD/MAZ/MeCP2 and promoter-level repression of MYCL1 via CpG methylation maintenance.\",\n      \"evidence\": \"BioID/MS interactome with domain mapping and MeCP2 co-regulation; CXXC5 ChIP, bisulfite and histone-modification analysis on MYCL1 promoter with epistasis rescue in hepatic stellate cells\",\n      \"pmids\": [\"34475492\", \"34621736\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of most interactome partners untested\", \"Generality of MeCP2 interplay beyond subset of genes unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended CXXC5's roles to erythropoiesis, ESC lineage choice, and cancer, defining direct promoter targets (SMAD7) and a repressive CRL4B-NuRD complex driving mTOR/PD-L1.\",\n      \"evidence\": \"RINF knockdown/SMAD7 ChIP and rescue in CD34+ cells with 5hmC profiling; Idax/Rinf ESC and embryo knockouts on Tet/neural/trophectoderm programs; CXXC5-CRL4B-NuRD Co-IP/ChIP-seq with xenografts; BMP/CXXC5 tumor-suppressor function in DIPG\",\n      \"pmids\": [\"33241676\", \"35390758\", \"36539038\", \"35915262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CXXC5 toggles between TET-anchoring and NuRD-repression complexes unresolved\", \"Context determinants of tumor-suppressor vs oncogenic behavior unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cemented CXXC5 as a genome-wide TET-anchoring methylation guardian and identified HIF1A as an upstream regulator driving proliferative cancer programs.\",\n      \"evidence\": \"CXXC5 KO with whole-genome bisulfite sequencing and TET1/TET2 ChIP co-localization; HIF1A ChIP on CXXC5 promoter with ZNF143/EGR1 downstream targets and xenografts\",\n      \"pmids\": [\"39585161\", \"38642782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why TET loss-of-anchoring causes net hypomethylation mechanistically not fully resolved\", \"Direct vs indirect activation of ZNF143/EGR1 not separated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined how CXXC5 abundance is set, identifying specific ubiquitinated lysines that drive proteasomal degradation independent of cell-cycle phase.\",\n      \"evidence\": \"BioUbiquitination + sequential IP-MS, cycloheximide chase, proteasome inhibition and synchronization in MCF-7/HEK293FT\",\n      \"pmids\": [\"40371716\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The responsible E3 ligase(s) not identified\", \"Whether degradation is signal-regulated (e.g., by Wnt/TGF-\\u03b2) untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what molecular switch partitions CXXC5 between its cytoplasmic Dvl-bound Wnt-inhibitory pool and its nuclear CpG/TET-anchoring and complex-specific transcriptional pools, and how this dictates activator versus repressor outcomes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No mechanism for cytoplasmic-nuclear partitioning defined\", \"Determinants of complex selection (TET vs NuRD vs HDAC1/Smad) unknown\", \"E3 ligase and signal-coupling of CXXC5 turnover unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 6, 18, 20, 22, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 6, 20, 22, 24, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 14, 15, 26]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 5, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 15, 26]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [15, 20, 24, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5, 14, 25]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [10, 12, 20, 24, 26]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 6, 20, 22, 24, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 6, 15, 23]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [28]}\n    ],\n    \"complexes\": [\n      \"CRL4B-NuRD\",\n      \"CXXC5-TET1/TET2 (CpG island)\",\n      \"Nanog-Oct4-Tet1-Tet2\"\n    ],\n    \"partners\": [\n      \"DVL\",\n      \"TET2\",\n      \"TET1\",\n      \"SMAD3\",\n      \"HDAC1\",\n      \"SUV39H1\",\n      \"MECP2\",\n      \"NANOG\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}