{"gene":"CXXC1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2000,"finding":"CXXC1 (hCGBP) was identified as a transcriptional activator that binds specifically to unmethylated CpG dinucleotides via its CXXC domain. The CXXC domain fragment binds oligonucleotides containing a single CpG site, fails to bind when CpG is mutated or methylated, and does not bind single-stranded DNA or RNA. A single CpG dinucleotide introduced into an unrelated sequence is sufficient to create a binding site. Native hCGBP trans-activates CpG-containing promoters but not those lacking CpG.","method":"Ligand screening, electrophoretic mobility shift assay (EMSA), oligonucleotide competition assays, reporter gene trans-activation assays, Western analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro DNA-binding reconstitution with mutagenesis-equivalent specificity tests (mutated/methylated CpG probes), functional reporter assays, replicated across multiple orthogonal methods in single rigorous study","pmids":["10688657"],"is_preprint":false},{"year":2000,"finding":"CXXC1 (PCCX1) contains a PHD finger and a CXXC domain; the CXXC domain alone is sufficient for DNA binding. The acidic region confers transactivation, but the full-length protein is inactive because C-terminal regions inhibit the acidic domain. Proteolytic removal of the C-terminal inhibitory region activates the protein.","method":"Recombinant protein domain deletion/expression assays, transactivation reporter assays, Western analysis during cellular aging/immortalization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion experiments with functional readout in two orthogonal assays (DNA binding + transactivation), single lab","pmids":["10799292"],"is_preprint":false},{"year":2002,"finding":"CXXC1 (CGBP) localizes to nuclear speckles co-localizing with splicing factor SC-35 and acetylated histones (active chromatin/euchromatin), is excluded from metaphase chromosomes and heterochromatin. It associates with the nuclear matrix; fragments lacking nuclear matrix association also fail to localize to nuclear speckles and show reduced transcriptional activation. Punctate nuclear speckle localization requires signals in acidic, basic, and coiled-coil domains, not the DNA-binding domain, indicating protein–protein interactions drive subnuclear targeting. CGBP co-localizes with human trithorax, suggesting a common complex.","method":"Immunofluorescence/confocal microscopy, nuclear matrix fractionation, deletion mutant analysis, co-localization with SC-35 and acetylated histones","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiments with functional consequence (loss of nuclear matrix association = loss of transcriptional activation), multiple orthogonal methods, rigorous domain dissection","pmids":["12200428"],"is_preprint":false},{"year":2001,"finding":"Homozygous deletion of CXXC1 (CGBP) in mice results in embryonic lethality before 6.5 dpc. CGBP-null blastocysts are viable and can form inner cell mass and trophectoderm, establishing that CGBP is required for peri-implantation development (post-blastocyst stage) but not earlier.","method":"Homologous recombination knockout, histological examination, in vitro blastocyst outgrowth assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean germline knockout with defined developmental phenotype and blastocyst rescue experiment to pinpoint developmental stage of requirement","pmids":["11604496"],"is_preprint":false},{"year":2005,"finding":"CXXC1 (CGBP)-null embryonic stem cells show 60–80% reduction in global cytosine methylation, including hypo-methylation of repetitive elements, single-copy genes, and imprinted genes. Total DNA methyltransferase activity is reduced 30–60%, and DNMT1 protein levels are similarly reduced. De novo DNA methyltransferase activity is normal. Null cells are unable to differentiate and maintain pluripotency markers (Oct4, alkaline phosphatase). All phenotypes are rescued by re-introduction of a CGBP expression vector.","method":"ES cell knockout (homologous recombination), bisulfite sequencing, methyltransferase activity assays, Western blot, differentiation assays, rescue with expression vector","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical and cellular methods, rescue experiment confirms causality, single lab but highly rigorous","pmids":["15923607"],"is_preprint":false},{"year":2009,"finding":"CXXC1 (CFP1) is a component of the euchromatic SETD1A (Setd1A) histone H3K4 methyltransferase complex. In Cfp1-null ES cells, SETD1A protein levels are decreased and both SETD1A and H3K4me3 mislocalize to heterochromatin. Either the N-terminal (aa 1–367) or C-terminal (aa 361–656) fragment of CFP1 can restore SETD1A levels, but full-length CFP1 is required to restrict SETD1A and H3K4me3 to euchromatin. Both DNA-binding activity and SETD1A complex interaction are required for proper genomic targeting.","method":"ES cell knockout, structure-function analysis with point mutations and truncation fragments, immunofluorescence for subnuclear localization, Western blot","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — structure-function mutagenesis with direct subnuclear localization and protein level readouts, multiple domain constructs tested, single lab","pmids":["19951360"],"is_preprint":false},{"year":2014,"finding":"In mouse embryonic stem cells, the SETD1 complex subunit CXXC1 (Cxxc1) is primarily bound to active promoters but not to bivalent promoters (unlike MLL2). This indicates that active promoters rely on SETD1 complex (with CXXC1) for H3K4me3, whereas bivalent promoters rely on MLL2.","method":"ChIP-seq in wild-type and Mll2-knockout/Mll1-knockout ES cells, genomic occupancy mapping","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq with genetic knockouts provides pathway placement, but CXXC1 findings are secondary to main MLL2 focus; single lab","pmids":["24423662"],"is_preprint":false},{"year":2014,"finding":"Conditional deletion of Cxxc1 in adult hematopoietic cells (Mx1-Cre system) causes failure of hematopoiesis, near-complete loss of lineage-committed progenitors and mature blood cells, elevated apoptosis, and death within two weeks. The Lin−Sca-1+c-Kit+ (LSK) stem/progenitor population persists and expands, indicating CXXC1 is specifically required for differentiation of hematopoietic stem and progenitor cells but not their maintenance. Bone marrow transplant confirmed the phenotype is cell-intrinsic.","method":"Conditional knockout (Mx1-Cre), bone marrow transplantation, flow cytometry, histology","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with transplant rescue confirming cell-intrinsic role, multiple phenotypic readouts, rigorous controls","pmids":["25470594"],"is_preprint":false},{"year":2016,"finding":"CXXC1 directly controls expression of key thymocyte survival genes (RORγt) and T-cell receptor signaling genes (Zap70, CD8) by maintaining H3K4me3 at their promoters. Cxxc1-deficient mice show severely impaired T-cell development. RORγt overexpression rescues survival defects in Cxxc1-deficient thymocytes, placing CXXC1 upstream of RORγt in this pathway.","method":"T-cell-specific conditional Cxxc1 knockout, ChIP-seq for genome-wide CXXC1 binding and H3K4me3, rescue by RORγt overexpression, flow cytometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with ChIP-seq for direct target identification and epistasis rescue experiment, multiple orthogonal methods","pmids":["27210293"],"is_preprint":false},{"year":2016,"finding":"CXXC1 was identified as a direct interactor of the KRAB domain of PRDM9 in meiotic spermatocytes. This interaction was demonstrated by yeast two-hybrid assay, in vitro binding, and co-immunoprecipitation from mouse spermatocytes. CXXC1 also interacts with meiotic cohesin REC8 and synaptonemal complex proteins SYCP3/SYCP1, suggesting it links recombination hotspots to the chromosomal axis.","method":"Yeast two-hybrid assay, in vitro binding assay, co-immunoprecipitation from mouse spermatocytes","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — three orthogonal methods (Y2H, in vitro binding, co-IP from native tissue) for the PRDM9-CXXC1 interaction","pmids":["27932493"],"is_preprint":false},{"year":2017,"finding":"Oocyte-specific deletion of Cxxc1 (encoding CFP1, the DNA-binding subunit of SETD1 H3K4 methyltransferase) causes failure of H3K4me3 accumulation and defective deposition of histone variants onto chromatin. Cxxc1-null oocytes fail to complete maturation and are unable to gain developmental competence after fertilization due to defects in cytoplasmic lattice formation, meiotic division, and maternal-zygotic transition.","method":"Oocyte-specific conditional Cxxc1 knockout, ChIP, immunofluorescence, embryo development assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — oocyte-specific conditional KO with multiple defined cellular phenotypic readouts and mechanistic link to H3K4me3","pmids":["28768200"],"is_preprint":false},{"year":2017,"finding":"The KRAB domain of PRDM9 interacts with CXXC1 as demonstrated by yeast two-hybrid screens. CXXC1 in turn interacts with IHO1, a component of the meiotic double-strand break machinery. This positions CXXC1 as a potential molecular bridge between PRDM9-activated hotspots and the DSB machinery, analogous to yeast Spp1.","method":"Yeast two-hybrid assay","journal":"Chromosoma","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid only for CXXC1 interactions, but corroborated by independent lab (PMID:27932493); mechanistic model proposed but not fully validated biochemically","pmids":["28527011"],"is_preprint":false},{"year":2018,"finding":"Oocyte-specific knockout of Cxxc1 causes a delay of meiotic resumption and metaphase I arrest due to defective spindle assembly and chromosome misalignment. These defects are partially attributed to insufficient phosphorylation of histone H3 at threonine-3. CDK1 triggers cell division-coupled degradation and inhibitory phosphorylation of CFP1; preventing CFP1 degradation causes its accumulation on chromosomes and impairs meiotic maturation and preimplantation embryo development.","method":"Oocyte-specific Cxxc1 knockout, CFP1 inhibitor treatment, live imaging, immunofluorescence, phosphorylation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus pharmacological and overexpression approaches with mechanistic link to CDK1-mediated phosphorylation, multiple orthogonal readouts","pmids":["30154440"],"is_preprint":false},{"year":2018,"finding":"NEGATIVE FINDING: Conditional knockout of Cxxc1 in mouse spermatocytes does not affect PRDM9 hotspot H3K4me3 trimethylation, double-strand break formation, or DSB repair, and male knockout mice are fertile. This demonstrates that CXXC1 is not an essential link between PRDM9-activated hotspot sites and the DSB machinery in mice, unlike its yeast ortholog Spp1.","method":"Two independent conditional Cxxc1 knockout mouse models (germ cell-specific and pre-meiotic), fertility assays, DMC1 ChIP-seq, H3K4me3 ChIP-seq","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent conditional KO models with genome-wide ChIP-seq readouts; rigorously negative result contradicting the model from PMID:27932493 and PMID:28527011","pmids":["30365547"],"is_preprint":false},{"year":2018,"finding":"CFP1 (CXXC1) occupies not only CpG island-associated active transcription start sites but also active non-CpG island TSSs and enhancers of transcribed genes in human haematopoietic cells. CFP1 occupancy at CGI promoters is mutually exclusive with H3K27me3 (Polycomb repressive mark). CpG-containing DNA motifs are enriched in CFP1 peaks at CGI promoters.","method":"ChIP-seq in two human haematopoietic cell types","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq in two cell types, single lab, no functional perturbation","pmids":["30292235"],"is_preprint":false},{"year":2019,"finding":"CXXC1 promotes TH17 cell generation and prevents Treg differentiation by binding to the Il6rα gene locus and maintaining H3K4me3 at its promoter, thereby sustaining IL-6Rα expression and IL-6/STAT3 signaling. Cxxc1-deficient T cells have decreased IL-6Rα expression; overexpression of IL-6Rα partially reverses TH17 differentiation defects in vitro and in vivo.","method":"T cell-specific Cxxc1 conditional knockout, ChIP-seq for genome-wide CXXC1 binding and H3K4me3, IL-6Rα overexpression rescue, in vivo EAE model","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with ChIP-seq for direct target identification, epistasis rescue with IL-6Rα overexpression, in vivo validation","pmids":["31633019"],"is_preprint":false},{"year":2019,"finding":"CFP1 (CXXC1)-dependent H3K4me3 in oocytes is required for the expression of key paracrine factors that mediate communication between oocytes and surrounding granulosa cells. Oocyte-specific Cxxc1 knockout disrupts gene expression in cumulus cells and impairs follicle growth and ovulation by indirectly compromising FSH and LH signaling pathways in granulosa cells—a cell-nonautonomous effect.","method":"Oocyte-specific Cxxc1 conditional knockout, transcriptome analysis of cumulus cells, ovarian histology, hormone signaling assays","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with transcriptomic readout establishing cell-nonautonomous mechanism, multiple phenotypic endpoints","pmids":["31676962"],"is_preprint":false},{"year":2020,"finding":"Meiosis-specific conditional deletion of Cxxc1 causes complete male sterility with spermatogenesis arrested at MII. Loss of CXXC1 decreases H3K4me3 from pachytene to MII, causes transcriptional disorder including premature expression of spermatogenesis genes (leading to abnormal acrosome formation), delays DSB repair, and causes improper crossover formation in pachytene cells. More than half of diplotene cells show precocious homologous chromosome segregation in both male and female meiosis. CXXC1 deletion also decreases H3K4me3 at DMC1-binding sites, potentially compromising DSB generation.","method":"Conditional Cxxc1 knockout (Stra8-Cre), ChIP-seq for H3K4me3 and DMC1, meiotic spread analysis, immunofluorescence for crossover markers","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with genome-wide ChIP-seq, multiple meiotic phenotypic readouts in both sexes","pmids":["32094118"],"is_preprint":false},{"year":2021,"finding":"Oocyte-specific Cxxc1 knockout impairs H3K4me3 accumulation genome-wide (promoter regions and gene bodies). CXXC1 and MLL2 have non-overlapping roles in H3K4 trimethylation during oogenesis. Cxxc1 deletion reduces DNA methylation levels and disrupts H3K27me3 and H2AK119ub1 distributions, particularly at high DNA methylation regions, indicating CXXC1 orchestrates multiple epigenetic layers in oocytes.","method":"Oocyte-specific conditional Cxxc1 knockout, CUT&TAG for H3K4me3/H3K27me3/H2AK119ub1, whole-genome bisulfite sequencing for DNA methylation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — genome-wide multi-epigenome profiling in conditional KO, multiple orthogonal methods establishing epistasis with MLL2 and downstream epigenetic effects","pmids":["33621320"],"is_preprint":false},{"year":2021,"finding":"The CXXC1 subunit of the Trithorax complex directs transcription of a specific set of genes in CD4+ T cells that are initially downregulated by TCR stimulation but re-expressed in a later phase. Loss of CXXC1 impairs late upregulation of Trib3 (Th1) and Klf2 (Th2) and enhances pathogenicity in allergic airway inflammation in vivo.","method":"T cell-specific conditional Cxxc1 knockout, transcriptomic profiling, in vivo allergic airway inflammation model","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — conditional KO with transcriptomic and in vivo readouts, but mechanistic link between CXXC1 and specific target genes not established by direct ChIP; single lab","pmids":["33433611"],"is_preprint":false},{"year":2022,"finding":"Oocyte-specific Cxxc1 knockout causes ooplasm changes associated with accelerated aging, and impairs maternal mRNA translation and degradation. CXXC1-maintained H3K4me3 is linked to mRNA decay competence and sets a timer for oocyte deterioration. H3K4me3 levels are high in fully grown oocytes from young females but decrease with age, correlating with decreased CXXC1 expression.","method":"Oocyte-specific conditional Cxxc1 knockout, transcriptome analysis (scRNA-seq), H3K4me3 profiling in young vs aged oocytes","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with transcriptomic and epigenomic readouts linking CXXC1 to mRNA decay machinery; aging correlation is observational but KO provides causal evidence","pmids":["35680896"],"is_preprint":false},{"year":2013,"finding":"The CXXC domain of CGBP (CFP1/CXXC1) can bind unmethylated CpG-containing DNA in vitro with a distinct affinity compared to MLL and DNMT1 CXXC domains. When substituted for the MLL CXXC domain in the MLL-AF9 leukemogenic fusion protein, the CGBP CXXC domain abrogates colony-forming ability and leukemogenicity despite allowing targeting to the Hoxa9 locus, because it does not protect specific CpG residues at the Hoxa9 locus from methylation in the same manner as MLL CXXC.","method":"Domain swap experiments in MLL-AF9 fusion, in vitro DNA binding affinity assays, colony-forming assays, in vivo leukemogenesis, ChIP at Hoxa9","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding combined with functional cellular and in vivo assays; mechanistic distinction between CXXC domains established with multiple methods","pmids":["23990460"],"is_preprint":false},{"year":2025,"finding":"CXXC1 (CFP1) physically interacts with the transcription factor FOXP3 in regulatory T cells and co-occupies genomic regulatory regions of Treg program genes overlapping with FOXP3-binding sites. CXXC1 facilitates regulation of FOXP3 target genes by modulating H3K4me3 deposition at these loci. Cxxc1 deletion in Treg cells causes severe inflammatory disease and impaired immunosuppressive function.","method":"Treg-specific Cxxc1 conditional knockout, co-immunoprecipitation (CXXC1-FOXP3 interaction), CUT&TAG for H3K4me3 and CXXC1 genomic occupancy, ChIP for FOXP3","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with co-IP for physical interaction and genome-wide occupancy showing co-localization, multiple orthogonal methods","pmids":["40183773"],"is_preprint":false},{"year":2025,"finding":"In Xenopus laevis, Cxxc1 ensures establishment of H3K4me3 at CpG-dense, DNA-hypomethylated loci in gametes and pre-ZGA embryos, and is required for proper zygotic genome activation (ZGA) including expression of the key ZGA transcription factor Pou5f3.2. H3K4me3 pre-marking at these loci is required for successful ZGA and development.","method":"Xenopus laevis Cxxc1 loss-of-function, H3K4me3 ChIP-seq across developmental stages, ZGA transcriptome analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in vertebrate model with genome-wide H3K4me3 profiling and transcriptomic readout; ortholog study, single lab","pmids":["41419741"],"is_preprint":false},{"year":2025,"finding":"CXXC1 depletion in CXXC1-dependent melanoma cells reduces global H3K4me3 levels and inhibits proliferation. The Set1C/COMPASS dependency is linked to MYC- and E2F-driven transcriptional programs, which are suppressed upon CXXC1/complex inhibition.","method":"CRISPR genetic depletion of CXXC1 in melanoma cell lines, H3K4me3 ChIP-seq, transcriptional profiling, proliferation assays, integrative dependency mapping","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic depletion with ChIP-seq and transcriptomic readout; preprint, single lab","pmids":["41726895"],"is_preprint":true},{"year":2025,"finding":"CRISPR knockout screen identified CXXC1 as essential for epidermal progenitor homeostasis and differentiation in human keratinocytes.","method":"Genome-wide CRISPR knockout screen of 1772 TFs in human epidermal cells","journal":"Nature communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pooled screen identifies essentiality but provides no molecular mechanism; single method, no follow-up mechanistic experiment on CXXC1 specifically","pmids":["40998781"],"is_preprint":false}],"current_model":"CXXC1 (CFP1/CGBP) is a CXXC domain-containing protein that binds specifically to unmethylated CpG dinucleotides and functions as the DNA-targeting subunit of the SETD1A/B H3K4 methyltransferase (Set1C/COMPASS) complex, recruiting it to active, CpG-dense euchromatic promoters and enhancers to deposit H3K4me3; it restricts the complex to euchromatin (preventing heterochromatic mislocalization), is required for maintaining global cytosine methylation (via DNMT1 stability), and is essential for embryonic development, hematopoietic differentiation, oocyte maturation and meiotic crossover formation, T-cell development, and Treg homeostasis (the latter via direct interaction with FOXP3), with CDK1-mediated phosphorylation and degradation of CFP1 providing a cell cycle-coupled mechanism to remove it from chromatin during meiotic cell division."},"narrative":{"mechanistic_narrative":"CXXC1 (CFP1/CGBP) is the CpG-sensing, DNA-targeting subunit that couples recognition of unmethylated CpG dinucleotides to deposition of histone H3K4 trimethylation by the SETD1/Set1C (COMPASS) complex at active chromatin [PMID:10688657, PMID:19951360, PMID:30292235]. Its CXXC domain binds DNA containing even a single unmethylated CpG, fails to bind when the CpG is mutated or methylated, and does not bind single-stranded DNA or RNA, providing the molecular basis for its specificity [PMID:10688657]; a single CpG introduced into unrelated DNA is sufficient to create a binding site [PMID:10688657]. CXXC1 localizes to active euchromatin and the nuclear matrix and is excluded from heterochromatin and metaphase chromosomes [PMID:12200428]. As a component of the SETD1A H3K4 methyltransferase complex, CXXC1 stabilizes SETD1A protein and, through combined DNA-binding and complex-interaction activities, restricts SETD1A and H3K4me3 to euchromatin, preventing their heterochromatic mislocalization [PMID:19951360]. It occupies active CpG-island and non-CpG-island transcription start sites and enhancers, with occupancy mutually exclusive of the Polycomb mark H3K27me3 [PMID:30292235], and operates on active rather than bivalent promoters, complementing MLL2 [PMID:24423662]. CXXC1 is additionally required to maintain global cytosine methylation, acting through DNMT1 protein stability, since its loss reduces DNMT1 levels and global methylation by 60-80% without affecting de novo methyltransferase activity [PMID:15923607]. Through these activities CXXC1 is essential for peri-implantation embryogenesis [PMID:11604496], hematopoietic stem/progenitor differentiation [PMID:25470594], oocyte maturation and meiotic competence [PMID:28768200, PMID:30154440, PMID:33621320], spermatogenesis and crossover formation [PMID:32094118], and multiple T-cell programs—directing thymocyte survival via RORγt [PMID:27210293], TH17/Treg balance via the Il6rα locus [PMID:31633019], and Treg homeostasis through direct physical interaction with FOXP3 [PMID:40183773]. In meiosis, CDK1 drives cell-division-coupled inhibitory phosphorylation and degradation of CFP1 to clear it from chromosomes [PMID:30154440]. CXXC1 physically interacts with the PRDM9 KRAB domain and meiotic axis/recombination factors [PMID:27932493], but two independent conditional knockouts show it is dispensable for PRDM9 hotspot H3K4me3, DSB formation, and male fertility, excluding it as the essential Spp1-like hotspot-to-DSB bridge in mouse spermatocytes [PMID:30365547].","teleology":[{"year":2000,"claim":"Established the founding molecular activity—how CXXC1 reads the genome—by defining its CXXC domain as a sequence-specific reader of unmethylated CpG.","evidence":"EMSA, oligonucleotide competition, and reporter trans-activation with mutated/methylated CpG probes","pmids":["10688657","10799292"],"confidence":"High","gaps":["Did not place CXXC1 in any chromatin-modifying complex","Full-length protein transactivation is autoinhibited; physiological regulator of de-repression unknown"]},{"year":2002,"claim":"Resolved where CXXC1 acts in the nucleus, showing it partitions to active euchromatin and the nuclear matrix via protein interactions rather than its DNA-binding domain.","evidence":"Immunofluorescence, nuclear matrix fractionation, and deletion-mutant co-localization with SC-35 and acetylated histones","pmids":["12200428"],"confidence":"High","gaps":["Interaction partners driving speckle/matrix targeting not molecularly identified","Functional consequence of euchromatin restriction not yet tested genetically"]},{"year":2001,"claim":"Determined the developmental requirement for CXXC1, pinpointing an essential peri-implantation role distinct from early blastocyst formation.","evidence":"Germline knockout with histology and blastocyst outgrowth rescue mapping","pmids":["11604496"],"confidence":"High","gaps":["Molecular cause of lethality not defined","No link yet to chromatin or DNA methylation"]},{"year":2005,"claim":"Connected CXXC1 to maintenance of global DNA methylation through DNMT1, revealing a second epigenetic axis beyond its DNA-reading role.","evidence":"ES cell knockout with bisulfite sequencing, methyltransferase assays, Western, and expression-vector rescue","pmids":["15923607"],"confidence":"High","gaps":["Mechanism by which CXXC1 stabilizes DNMT1 not resolved","Relationship between methylation maintenance and H3K4me3 role not yet integrated"]},{"year":2009,"claim":"Defined CXXC1's core mechanistic identity as the SETD1A complex subunit that stabilizes the methyltransferase and restricts H3K4me3 to euchromatin.","evidence":"ES cell knockout with truncation/point-mutation structure-function and subnuclear localization readouts","pmids":["19951360"],"confidence":"High","gaps":["Genome-wide targeting rules not yet mapped","Separation of DNA-binding versus complex-interaction contributions at endogenous loci not resolved"]},{"year":2014,"claim":"Mapped CXXC1 genomic occupancy to active (not bivalent) promoters, distinguishing SETD1-CXXC1 from MLL2-dependent H3K4me3.","evidence":"ChIP-seq in wild-type and Mll-knockout ES cells","pmids":["24423662","30292235"],"confidence":"Medium","gaps":["Occupancy at enhancers and non-CGI TSS established only by correlation","No functional perturbation linking occupancy to transcription in these studies"]},{"year":2014,"claim":"Showed CXXC1 is a tissue-specific differentiation factor in hematopoiesis, required for HSPC differentiation but not stem-cell maintenance.","evidence":"Conditional (Mx1-Cre) knockout with bone marrow transplantation and flow cytometry","pmids":["25470594"],"confidence":"High","gaps":["Direct target genes in HSPCs not identified","Link to H3K4me3 not directly profiled in this system"]},{"year":2016,"claim":"Identified direct CXXC1 target genes governing T-cell development and established epistasis upstream of RORγt.","evidence":"T-cell conditional knockout with CXXC1/H3K4me3 ChIP-seq and RORγt rescue","pmids":["27210293"],"confidence":"High","gaps":["Whether all targets are direct SETD1-complex substrates not separated","Generalizability beyond thymocyte survival genes unclear"]},{"year":2017,"claim":"Tested the hypothesis that CXXC1 bridges PRDM9 hotspots to the meiotic DSB machinery, identifying physical links to PRDM9, cohesin, axis proteins, and IHO1.","evidence":"Yeast two-hybrid, in vitro binding, and co-IP from spermatocytes","pmids":["27932493","28527011"],"confidence":"High","gaps":["Interactions did not demonstrate functional necessity in vivo","Y2H/in vitro binding not validated by loss-of-function at the time"]},{"year":2017,"claim":"Established CXXC1 as the SETD1 DNA-binding subunit required for oocyte H3K4me3, maturation, and developmental competence.","evidence":"Oocyte-specific conditional knockout with ChIP, immunofluorescence, and embryo development assays","pmids":["28768200"],"confidence":"High","gaps":["Direct target genes underlying maturation failure not pinpointed","Cytoplasmic lattice defect mechanism not resolved"]},{"year":2018,"claim":"Refuted the Spp1-like hotspot-bridge model in mouse, showing CXXC1 is dispensable for PRDM9 hotspot H3K4me3, DSB formation, and male fertility.","evidence":"Two independent conditional knockouts with DMC1 and H3K4me3 ChIP-seq and fertility assays","pmids":["30365547"],"confidence":"High","gaps":["Reconciliation with documented physical interactions not fully explained","Possible redundancy masking a role not excluded"]},{"year":2018,"claim":"Revealed cell-cycle control of CXXC1 in meiosis, with CDK1-driven phosphorylation and degradation clearing CFP1 from chromosomes for proper division.","evidence":"Oocyte conditional knockout plus pharmacological inhibition, overexpression, live imaging, and phospho-analysis","pmids":["30154440"],"confidence":"High","gaps":["CDK1 phosphosites on CFP1 not enumerated","Degradation machinery not identified"]},{"year":2019,"claim":"Extended CXXC1's T-cell role to TH17/Treg balance via direct maintenance of H3K4me3 at the Il6rα locus and IL-6/STAT3 signaling.","evidence":"T-cell conditional knockout with ChIP-seq, IL-6Rα rescue, and in vivo EAE","pmids":["31633019"],"confidence":"High","gaps":["Rescue only partial, implying additional targets","Direct versus indirect effects on STAT3 axis not fully separated"]},{"year":2019,"claim":"Demonstrated a cell-nonautonomous output of CXXC1-dependent H3K4me3, controlling oocyte paracrine signaling to granulosa cells and follicle growth.","evidence":"Oocyte conditional knockout with cumulus-cell transcriptomics, ovarian histology, and hormone signaling assays","pmids":["31676962"],"confidence":"High","gaps":["Identity of the key paracrine factors not narrowed","Direct CXXC1 targets among paracrine genes not ChIP-validated"]},{"year":2020,"claim":"Defined CXXC1's meiotic requirement in spermatogenesis, linking H3K4me3 maintenance to transcriptional timing, DSB repair, and crossover formation.","evidence":"Stra8-Cre conditional knockout with H3K4me3/DMC1 ChIP-seq and meiotic spread analysis","pmids":["32094118"],"confidence":"High","gaps":["Apparent tension with the negative fertility study (#13) regarding meiotic requirement not reconciled","Direct cause of crossover defect not isolated"]},{"year":2021,"claim":"Showed CXXC1 orchestrates multiple epigenetic layers in oocytes—H3K4me3, DNA methylation, H3K27me3, H2AK119ub1—and acts non-redundantly with MLL2.","evidence":"Oocyte conditional knockout with CUT&TAG and whole-genome bisulfite sequencing","pmids":["33621320"],"confidence":"High","gaps":["Causal hierarchy among the affected marks not established","Direct versus secondary effects on H3K27me3/H2AK119ub1 unresolved"]},{"year":2021,"claim":"Extended CXXC1's CD4+ T-cell role to phase-specific late re-expression of TCR-modulated genes affecting Th1/Th2 programs and inflammation.","evidence":"T-cell conditional knockout with transcriptomics and in vivo airway inflammation","pmids":["33433611"],"confidence":"Medium","gaps":["Direct binding to Trib3/Klf2 not shown by ChIP","Mechanism of temporal control of re-expression unknown"]},{"year":2022,"claim":"Linked CXXC1-maintained H3K4me3 to maternal mRNA translation/decay and an aging timer in oocytes.","evidence":"Oocyte conditional knockout with scRNA-seq and H3K4me3 profiling in young versus aged oocytes","pmids":["35680896"],"confidence":"Medium","gaps":["Mechanistic coupling of H3K4me3 to mRNA decay competence not defined","Aging-associated CXXC1 decline is correlative"]},{"year":2025,"claim":"Identified a transcription-factor-directed mode of recruitment, with CXXC1 physically interacting with FOXP3 and co-occupying Treg program loci to set H3K4me3 and immunosuppressive function.","evidence":"Treg conditional knockout with co-IP, CUT&TAG for CXXC1/H3K4me3, and FOXP3 ChIP","pmids":["40183773"],"confidence":"High","gaps":["Whether FOXP3 recruits CXXC1 or vice versa not resolved","Interaction interface not mapped"]},{"year":2025,"claim":"Showed conservation of CXXC1 function in zygotic genome 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The CXXC domain fragment binds oligonucleotides containing a single CpG site, fails to bind when CpG is mutated or methylated, and does not bind single-stranded DNA or RNA. A single CpG dinucleotide introduced into an unrelated sequence is sufficient to create a binding site. Native hCGBP trans-activates CpG-containing promoters but not those lacking CpG.\",\n      \"method\": \"Ligand screening, electrophoretic mobility shift assay (EMSA), oligonucleotide competition assays, reporter gene trans-activation assays, Western analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro DNA-binding reconstitution with mutagenesis-equivalent specificity tests (mutated/methylated CpG probes), functional reporter assays, replicated across multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"10688657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CXXC1 (PCCX1) contains a PHD finger and a CXXC domain; the CXXC domain alone is sufficient for DNA binding. The acidic region confers transactivation, but the full-length protein is inactive because C-terminal regions inhibit the acidic domain. Proteolytic removal of the C-terminal inhibitory region activates the protein.\",\n      \"method\": \"Recombinant protein domain deletion/expression assays, transactivation reporter assays, Western analysis during cellular aging/immortalization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion experiments with functional readout in two orthogonal assays (DNA binding + transactivation), single lab\",\n      \"pmids\": [\"10799292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CXXC1 (CGBP) localizes to nuclear speckles co-localizing with splicing factor SC-35 and acetylated histones (active chromatin/euchromatin), is excluded from metaphase chromosomes and heterochromatin. It associates with the nuclear matrix; fragments lacking nuclear matrix association also fail to localize to nuclear speckles and show reduced transcriptional activation. Punctate nuclear speckle localization requires signals in acidic, basic, and coiled-coil domains, not the DNA-binding domain, indicating protein–protein interactions drive subnuclear targeting. CGBP co-localizes with human trithorax, suggesting a common complex.\",\n      \"method\": \"Immunofluorescence/confocal microscopy, nuclear matrix fractionation, deletion mutant analysis, co-localization with SC-35 and acetylated histones\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with functional consequence (loss of nuclear matrix association = loss of transcriptional activation), multiple orthogonal methods, rigorous domain dissection\",\n      \"pmids\": [\"12200428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Homozygous deletion of CXXC1 (CGBP) in mice results in embryonic lethality before 6.5 dpc. CGBP-null blastocysts are viable and can form inner cell mass and trophectoderm, establishing that CGBP is required for peri-implantation development (post-blastocyst stage) but not earlier.\",\n      \"method\": \"Homologous recombination knockout, histological examination, in vitro blastocyst outgrowth assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean germline knockout with defined developmental phenotype and blastocyst rescue experiment to pinpoint developmental stage of requirement\",\n      \"pmids\": [\"11604496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CXXC1 (CGBP)-null embryonic stem cells show 60–80% reduction in global cytosine methylation, including hypo-methylation of repetitive elements, single-copy genes, and imprinted genes. Total DNA methyltransferase activity is reduced 30–60%, and DNMT1 protein levels are similarly reduced. De novo DNA methyltransferase activity is normal. Null cells are unable to differentiate and maintain pluripotency markers (Oct4, alkaline phosphatase). All phenotypes are rescued by re-introduction of a CGBP expression vector.\",\n      \"method\": \"ES cell knockout (homologous recombination), bisulfite sequencing, methyltransferase activity assays, Western blot, differentiation assays, rescue with expression vector\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical and cellular methods, rescue experiment confirms causality, single lab but highly rigorous\",\n      \"pmids\": [\"15923607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CXXC1 (CFP1) is a component of the euchromatic SETD1A (Setd1A) histone H3K4 methyltransferase complex. In Cfp1-null ES cells, SETD1A protein levels are decreased and both SETD1A and H3K4me3 mislocalize to heterochromatin. Either the N-terminal (aa 1–367) or C-terminal (aa 361–656) fragment of CFP1 can restore SETD1A levels, but full-length CFP1 is required to restrict SETD1A and H3K4me3 to euchromatin. Both DNA-binding activity and SETD1A complex interaction are required for proper genomic targeting.\",\n      \"method\": \"ES cell knockout, structure-function analysis with point mutations and truncation fragments, immunofluorescence for subnuclear localization, Western blot\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — structure-function mutagenesis with direct subnuclear localization and protein level readouts, multiple domain constructs tested, single lab\",\n      \"pmids\": [\"19951360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In mouse embryonic stem cells, the SETD1 complex subunit CXXC1 (Cxxc1) is primarily bound to active promoters but not to bivalent promoters (unlike MLL2). This indicates that active promoters rely on SETD1 complex (with CXXC1) for H3K4me3, whereas bivalent promoters rely on MLL2.\",\n      \"method\": \"ChIP-seq in wild-type and Mll2-knockout/Mll1-knockout ES cells, genomic occupancy mapping\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq with genetic knockouts provides pathway placement, but CXXC1 findings are secondary to main MLL2 focus; single lab\",\n      \"pmids\": [\"24423662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Conditional deletion of Cxxc1 in adult hematopoietic cells (Mx1-Cre system) causes failure of hematopoiesis, near-complete loss of lineage-committed progenitors and mature blood cells, elevated apoptosis, and death within two weeks. The Lin−Sca-1+c-Kit+ (LSK) stem/progenitor population persists and expands, indicating CXXC1 is specifically required for differentiation of hematopoietic stem and progenitor cells but not their maintenance. Bone marrow transplant confirmed the phenotype is cell-intrinsic.\",\n      \"method\": \"Conditional knockout (Mx1-Cre), bone marrow transplantation, flow cytometry, histology\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with transplant rescue confirming cell-intrinsic role, multiple phenotypic readouts, rigorous controls\",\n      \"pmids\": [\"25470594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CXXC1 directly controls expression of key thymocyte survival genes (RORγt) and T-cell receptor signaling genes (Zap70, CD8) by maintaining H3K4me3 at their promoters. Cxxc1-deficient mice show severely impaired T-cell development. RORγt overexpression rescues survival defects in Cxxc1-deficient thymocytes, placing CXXC1 upstream of RORγt in this pathway.\",\n      \"method\": \"T-cell-specific conditional Cxxc1 knockout, ChIP-seq for genome-wide CXXC1 binding and H3K4me3, rescue by RORγt overexpression, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with ChIP-seq for direct target identification and epistasis rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"27210293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CXXC1 was identified as a direct interactor of the KRAB domain of PRDM9 in meiotic spermatocytes. This interaction was demonstrated by yeast two-hybrid assay, in vitro binding, and co-immunoprecipitation from mouse spermatocytes. CXXC1 also interacts with meiotic cohesin REC8 and synaptonemal complex proteins SYCP3/SYCP1, suggesting it links recombination hotspots to the chromosomal axis.\",\n      \"method\": \"Yeast two-hybrid assay, in vitro binding assay, co-immunoprecipitation from mouse spermatocytes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three orthogonal methods (Y2H, in vitro binding, co-IP from native tissue) for the PRDM9-CXXC1 interaction\",\n      \"pmids\": [\"27932493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Oocyte-specific deletion of Cxxc1 (encoding CFP1, the DNA-binding subunit of SETD1 H3K4 methyltransferase) causes failure of H3K4me3 accumulation and defective deposition of histone variants onto chromatin. Cxxc1-null oocytes fail to complete maturation and are unable to gain developmental competence after fertilization due to defects in cytoplasmic lattice formation, meiotic division, and maternal-zygotic transition.\",\n      \"method\": \"Oocyte-specific conditional Cxxc1 knockout, ChIP, immunofluorescence, embryo development assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — oocyte-specific conditional KO with multiple defined cellular phenotypic readouts and mechanistic link to H3K4me3\",\n      \"pmids\": [\"28768200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The KRAB domain of PRDM9 interacts with CXXC1 as demonstrated by yeast two-hybrid screens. CXXC1 in turn interacts with IHO1, a component of the meiotic double-strand break machinery. This positions CXXC1 as a potential molecular bridge between PRDM9-activated hotspots and the DSB machinery, analogous to yeast Spp1.\",\n      \"method\": \"Yeast two-hybrid assay\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid only for CXXC1 interactions, but corroborated by independent lab (PMID:27932493); mechanistic model proposed but not fully validated biochemically\",\n      \"pmids\": [\"28527011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Oocyte-specific knockout of Cxxc1 causes a delay of meiotic resumption and metaphase I arrest due to defective spindle assembly and chromosome misalignment. These defects are partially attributed to insufficient phosphorylation of histone H3 at threonine-3. CDK1 triggers cell division-coupled degradation and inhibitory phosphorylation of CFP1; preventing CFP1 degradation causes its accumulation on chromosomes and impairs meiotic maturation and preimplantation embryo development.\",\n      \"method\": \"Oocyte-specific Cxxc1 knockout, CFP1 inhibitor treatment, live imaging, immunofluorescence, phosphorylation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus pharmacological and overexpression approaches with mechanistic link to CDK1-mediated phosphorylation, multiple orthogonal readouts\",\n      \"pmids\": [\"30154440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NEGATIVE FINDING: Conditional knockout of Cxxc1 in mouse spermatocytes does not affect PRDM9 hotspot H3K4me3 trimethylation, double-strand break formation, or DSB repair, and male knockout mice are fertile. This demonstrates that CXXC1 is not an essential link between PRDM9-activated hotspot sites and the DSB machinery in mice, unlike its yeast ortholog Spp1.\",\n      \"method\": \"Two independent conditional Cxxc1 knockout mouse models (germ cell-specific and pre-meiotic), fertility assays, DMC1 ChIP-seq, H3K4me3 ChIP-seq\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent conditional KO models with genome-wide ChIP-seq readouts; rigorously negative result contradicting the model from PMID:27932493 and PMID:28527011\",\n      \"pmids\": [\"30365547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CFP1 (CXXC1) occupies not only CpG island-associated active transcription start sites but also active non-CpG island TSSs and enhancers of transcribed genes in human haematopoietic cells. CFP1 occupancy at CGI promoters is mutually exclusive with H3K27me3 (Polycomb repressive mark). CpG-containing DNA motifs are enriched in CFP1 peaks at CGI promoters.\",\n      \"method\": \"ChIP-seq in two human haematopoietic cell types\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq in two cell types, single lab, no functional perturbation\",\n      \"pmids\": [\"30292235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CXXC1 promotes TH17 cell generation and prevents Treg differentiation by binding to the Il6rα gene locus and maintaining H3K4me3 at its promoter, thereby sustaining IL-6Rα expression and IL-6/STAT3 signaling. Cxxc1-deficient T cells have decreased IL-6Rα expression; overexpression of IL-6Rα partially reverses TH17 differentiation defects in vitro and in vivo.\",\n      \"method\": \"T cell-specific Cxxc1 conditional knockout, ChIP-seq for genome-wide CXXC1 binding and H3K4me3, IL-6Rα overexpression rescue, in vivo EAE model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with ChIP-seq for direct target identification, epistasis rescue with IL-6Rα overexpression, in vivo validation\",\n      \"pmids\": [\"31633019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CFP1 (CXXC1)-dependent H3K4me3 in oocytes is required for the expression of key paracrine factors that mediate communication between oocytes and surrounding granulosa cells. Oocyte-specific Cxxc1 knockout disrupts gene expression in cumulus cells and impairs follicle growth and ovulation by indirectly compromising FSH and LH signaling pathways in granulosa cells—a cell-nonautonomous effect.\",\n      \"method\": \"Oocyte-specific Cxxc1 conditional knockout, transcriptome analysis of cumulus cells, ovarian histology, hormone signaling assays\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with transcriptomic readout establishing cell-nonautonomous mechanism, multiple phenotypic endpoints\",\n      \"pmids\": [\"31676962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Meiosis-specific conditional deletion of Cxxc1 causes complete male sterility with spermatogenesis arrested at MII. Loss of CXXC1 decreases H3K4me3 from pachytene to MII, causes transcriptional disorder including premature expression of spermatogenesis genes (leading to abnormal acrosome formation), delays DSB repair, and causes improper crossover formation in pachytene cells. More than half of diplotene cells show precocious homologous chromosome segregation in both male and female meiosis. CXXC1 deletion also decreases H3K4me3 at DMC1-binding sites, potentially compromising DSB generation.\",\n      \"method\": \"Conditional Cxxc1 knockout (Stra8-Cre), ChIP-seq for H3K4me3 and DMC1, meiotic spread analysis, immunofluorescence for crossover markers\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with genome-wide ChIP-seq, multiple meiotic phenotypic readouts in both sexes\",\n      \"pmids\": [\"32094118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Oocyte-specific Cxxc1 knockout impairs H3K4me3 accumulation genome-wide (promoter regions and gene bodies). CXXC1 and MLL2 have non-overlapping roles in H3K4 trimethylation during oogenesis. Cxxc1 deletion reduces DNA methylation levels and disrupts H3K27me3 and H2AK119ub1 distributions, particularly at high DNA methylation regions, indicating CXXC1 orchestrates multiple epigenetic layers in oocytes.\",\n      \"method\": \"Oocyte-specific conditional Cxxc1 knockout, CUT&TAG for H3K4me3/H3K27me3/H2AK119ub1, whole-genome bisulfite sequencing for DNA methylation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genome-wide multi-epigenome profiling in conditional KO, multiple orthogonal methods establishing epistasis with MLL2 and downstream epigenetic effects\",\n      \"pmids\": [\"33621320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The CXXC1 subunit of the Trithorax complex directs transcription of a specific set of genes in CD4+ T cells that are initially downregulated by TCR stimulation but re-expressed in a later phase. Loss of CXXC1 impairs late upregulation of Trib3 (Th1) and Klf2 (Th2) and enhances pathogenicity in allergic airway inflammation in vivo.\",\n      \"method\": \"T cell-specific conditional Cxxc1 knockout, transcriptomic profiling, in vivo allergic airway inflammation model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — conditional KO with transcriptomic and in vivo readouts, but mechanistic link between CXXC1 and specific target genes not established by direct ChIP; single lab\",\n      \"pmids\": [\"33433611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Oocyte-specific Cxxc1 knockout causes ooplasm changes associated with accelerated aging, and impairs maternal mRNA translation and degradation. CXXC1-maintained H3K4me3 is linked to mRNA decay competence and sets a timer for oocyte deterioration. H3K4me3 levels are high in fully grown oocytes from young females but decrease with age, correlating with decreased CXXC1 expression.\",\n      \"method\": \"Oocyte-specific conditional Cxxc1 knockout, transcriptome analysis (scRNA-seq), H3K4me3 profiling in young vs aged oocytes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with transcriptomic and epigenomic readouts linking CXXC1 to mRNA decay machinery; aging correlation is observational but KO provides causal evidence\",\n      \"pmids\": [\"35680896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The CXXC domain of CGBP (CFP1/CXXC1) can bind unmethylated CpG-containing DNA in vitro with a distinct affinity compared to MLL and DNMT1 CXXC domains. When substituted for the MLL CXXC domain in the MLL-AF9 leukemogenic fusion protein, the CGBP CXXC domain abrogates colony-forming ability and leukemogenicity despite allowing targeting to the Hoxa9 locus, because it does not protect specific CpG residues at the Hoxa9 locus from methylation in the same manner as MLL CXXC.\",\n      \"method\": \"Domain swap experiments in MLL-AF9 fusion, in vitro DNA binding affinity assays, colony-forming assays, in vivo leukemogenesis, ChIP at Hoxa9\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding combined with functional cellular and in vivo assays; mechanistic distinction between CXXC domains established with multiple methods\",\n      \"pmids\": [\"23990460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CXXC1 (CFP1) physically interacts with the transcription factor FOXP3 in regulatory T cells and co-occupies genomic regulatory regions of Treg program genes overlapping with FOXP3-binding sites. CXXC1 facilitates regulation of FOXP3 target genes by modulating H3K4me3 deposition at these loci. Cxxc1 deletion in Treg cells causes severe inflammatory disease and impaired immunosuppressive function.\",\n      \"method\": \"Treg-specific Cxxc1 conditional knockout, co-immunoprecipitation (CXXC1-FOXP3 interaction), CUT&TAG for H3K4me3 and CXXC1 genomic occupancy, ChIP for FOXP3\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with co-IP for physical interaction and genome-wide occupancy showing co-localization, multiple orthogonal methods\",\n      \"pmids\": [\"40183773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Xenopus laevis, Cxxc1 ensures establishment of H3K4me3 at CpG-dense, DNA-hypomethylated loci in gametes and pre-ZGA embryos, and is required for proper zygotic genome activation (ZGA) including expression of the key ZGA transcription factor Pou5f3.2. H3K4me3 pre-marking at these loci is required for successful ZGA and development.\",\n      \"method\": \"Xenopus laevis Cxxc1 loss-of-function, H3K4me3 ChIP-seq across developmental stages, ZGA transcriptome analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in vertebrate model with genome-wide H3K4me3 profiling and transcriptomic readout; ortholog study, single lab\",\n      \"pmids\": [\"41419741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CXXC1 depletion in CXXC1-dependent melanoma cells reduces global H3K4me3 levels and inhibits proliferation. The Set1C/COMPASS dependency is linked to MYC- and E2F-driven transcriptional programs, which are suppressed upon CXXC1/complex inhibition.\",\n      \"method\": \"CRISPR genetic depletion of CXXC1 in melanoma cell lines, H3K4me3 ChIP-seq, transcriptional profiling, proliferation assays, integrative dependency mapping\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic depletion with ChIP-seq and transcriptomic readout; preprint, single lab\",\n      \"pmids\": [\"41726895\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRISPR knockout screen identified CXXC1 as essential for epidermal progenitor homeostasis and differentiation in human keratinocytes.\",\n      \"method\": \"Genome-wide CRISPR knockout screen of 1772 TFs in human epidermal cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pooled screen identifies essentiality but provides no molecular mechanism; single method, no follow-up mechanistic experiment on CXXC1 specifically\",\n      \"pmids\": [\"40998781\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CXXC1 (CFP1/CGBP) is a CXXC domain-containing protein that binds specifically to unmethylated CpG dinucleotides and functions as the DNA-targeting subunit of the SETD1A/B H3K4 methyltransferase (Set1C/COMPASS) complex, recruiting it to active, CpG-dense euchromatic promoters and enhancers to deposit H3K4me3; it restricts the complex to euchromatin (preventing heterochromatic mislocalization), is required for maintaining global cytosine methylation (via DNMT1 stability), and is essential for embryonic development, hematopoietic differentiation, oocyte maturation and meiotic crossover formation, T-cell development, and Treg homeostasis (the latter via direct interaction with FOXP3), with CDK1-mediated phosphorylation and degradation of CFP1 providing a cell cycle-coupled mechanism to remove it from chromatin during meiotic cell division.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CXXC1 (CFP1/CGBP) is the CpG-sensing, DNA-targeting subunit that couples recognition of unmethylated CpG dinucleotides to deposition of histone H3K4 trimethylation by the SETD1/Set1C (COMPASS) complex at active chromatin [#0, #5, #14]. Its CXXC domain binds DNA containing even a single unmethylated CpG, fails to bind when the CpG is mutated or methylated, and does not bind single-stranded DNA or RNA, providing the molecular basis for its specificity [#0]; a single CpG introduced into unrelated DNA is sufficient to create a binding site [#0]. CXXC1 localizes to active euchromatin and the nuclear matrix and is excluded from heterochromatin and metaphase chromosomes [#2]. As a component of the SETD1A H3K4 methyltransferase complex, CXXC1 stabilizes SETD1A protein and, through combined DNA-binding and complex-interaction activities, restricts SETD1A and H3K4me3 to euchromatin, preventing their heterochromatic mislocalization [#5]. It occupies active CpG-island and non-CpG-island transcription start sites and enhancers, with occupancy mutually exclusive of the Polycomb mark H3K27me3 [#14], and operates on active rather than bivalent promoters, complementing MLL2 [#6]. CXXC1 is additionally required to maintain global cytosine methylation, acting through DNMT1 protein stability, since its loss reduces DNMT1 levels and global methylation by 60-80% without affecting de novo methyltransferase activity [#4]. Through these activities CXXC1 is essential for peri-implantation embryogenesis [#3], hematopoietic stem/progenitor differentiation [#7], oocyte maturation and meiotic competence [#10, #12, #18], spermatogenesis and crossover formation [#17], and multiple T-cell programs—directing thymocyte survival via RORγt [#8], TH17/Treg balance via the Il6rα locus [#15], and Treg homeostasis through direct physical interaction with FOXP3 [#22]. In meiosis, CDK1 drives cell-division-coupled inhibitory phosphorylation and degradation of CFP1 to clear it from chromosomes [#12]. CXXC1 physically interacts with the PRDM9 KRAB domain and meiotic axis/recombination factors [#9], but two independent conditional knockouts show it is dispensable for PRDM9 hotspot H3K4me3, DSB formation, and male fertility, excluding it as the essential Spp1-like hotspot-to-DSB bridge in mouse spermatocytes [#13].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the founding molecular activity—how CXXC1 reads the genome—by defining its CXXC domain as a sequence-specific reader of unmethylated CpG.\",\n      \"evidence\": \"EMSA, oligonucleotide competition, and reporter trans-activation with mutated/methylated CpG probes\",\n      \"pmids\": [\"10688657\", \"10799292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not place CXXC1 in any chromatin-modifying complex\", \"Full-length protein transactivation is autoinhibited; physiological regulator of de-repression unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved where CXXC1 acts in the nucleus, showing it partitions to active euchromatin and the nuclear matrix via protein interactions rather than its DNA-binding domain.\",\n      \"evidence\": \"Immunofluorescence, nuclear matrix fractionation, and deletion-mutant co-localization with SC-35 and acetylated histones\",\n      \"pmids\": [\"12200428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interaction partners driving speckle/matrix targeting not molecularly identified\", \"Functional consequence of euchromatin restriction not yet tested genetically\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Determined the developmental requirement for CXXC1, pinpointing an essential peri-implantation role distinct from early blastocyst formation.\",\n      \"evidence\": \"Germline knockout with histology and blastocyst outgrowth rescue mapping\",\n      \"pmids\": [\"11604496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cause of lethality not defined\", \"No link yet to chromatin or DNA methylation\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Connected CXXC1 to maintenance of global DNA methylation through DNMT1, revealing a second epigenetic axis beyond its DNA-reading role.\",\n      \"evidence\": \"ES cell knockout with bisulfite sequencing, methyltransferase assays, Western, and expression-vector rescue\",\n      \"pmids\": [\"15923607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CXXC1 stabilizes DNMT1 not resolved\", \"Relationship between methylation maintenance and H3K4me3 role not yet integrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined CXXC1's core mechanistic identity as the SETD1A complex subunit that stabilizes the methyltransferase and restricts H3K4me3 to euchromatin.\",\n      \"evidence\": \"ES cell knockout with truncation/point-mutation structure-function and subnuclear localization readouts\",\n      \"pmids\": [\"19951360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide targeting rules not yet mapped\", \"Separation of DNA-binding versus complex-interaction contributions at endogenous loci not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped CXXC1 genomic occupancy to active (not bivalent) promoters, distinguishing SETD1-CXXC1 from MLL2-dependent H3K4me3.\",\n      \"evidence\": \"ChIP-seq in wild-type and Mll-knockout ES cells\",\n      \"pmids\": [\"24423662\", \"30292235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Occupancy at enhancers and non-CGI TSS established only by correlation\", \"No functional perturbation linking occupancy to transcription in these studies\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CXXC1 is a tissue-specific differentiation factor in hematopoiesis, required for HSPC differentiation but not stem-cell maintenance.\",\n      \"evidence\": \"Conditional (Mx1-Cre) knockout with bone marrow transplantation and flow cytometry\",\n      \"pmids\": [\"25470594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes in HSPCs not identified\", \"Link to H3K4me3 not directly profiled in this system\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified direct CXXC1 target genes governing T-cell development and established epistasis upstream of RORγt.\",\n      \"evidence\": \"T-cell conditional knockout with CXXC1/H3K4me3 ChIP-seq and RORγt rescue\",\n      \"pmids\": [\"27210293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all targets are direct SETD1-complex substrates not separated\", \"Generalizability beyond thymocyte survival genes unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Tested the hypothesis that CXXC1 bridges PRDM9 hotspots to the meiotic DSB machinery, identifying physical links to PRDM9, cohesin, axis proteins, and IHO1.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, and co-IP from spermatocytes\",\n      \"pmids\": [\"27932493\", \"28527011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interactions did not demonstrate functional necessity in vivo\", \"Y2H/in vitro binding not validated by loss-of-function at the time\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established CXXC1 as the SETD1 DNA-binding subunit required for oocyte H3K4me3, maturation, and developmental competence.\",\n      \"evidence\": \"Oocyte-specific conditional knockout with ChIP, immunofluorescence, and embryo development assays\",\n      \"pmids\": [\"28768200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes underlying maturation failure not pinpointed\", \"Cytoplasmic lattice defect mechanism not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Refuted the Spp1-like hotspot-bridge model in mouse, showing CXXC1 is dispensable for PRDM9 hotspot H3K4me3, DSB formation, and male fertility.\",\n      \"evidence\": \"Two independent conditional knockouts with DMC1 and H3K4me3 ChIP-seq and fertility assays\",\n      \"pmids\": [\"30365547\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with documented physical interactions not fully explained\", \"Possible redundancy masking a role not excluded\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed cell-cycle control of CXXC1 in meiosis, with CDK1-driven phosphorylation and degradation clearing CFP1 from chromosomes for proper division.\",\n      \"evidence\": \"Oocyte conditional knockout plus pharmacological inhibition, overexpression, live imaging, and phospho-analysis\",\n      \"pmids\": [\"30154440\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CDK1 phosphosites on CFP1 not enumerated\", \"Degradation machinery not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended CXXC1's T-cell role to TH17/Treg balance via direct maintenance of H3K4me3 at the Il6rα locus and IL-6/STAT3 signaling.\",\n      \"evidence\": \"T-cell conditional knockout with ChIP-seq, IL-6Rα rescue, and in vivo EAE\",\n      \"pmids\": [\"31633019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rescue only partial, implying additional targets\", \"Direct versus indirect effects on STAT3 axis not fully separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated a cell-nonautonomous output of CXXC1-dependent H3K4me3, controlling oocyte paracrine signaling to granulosa cells and follicle growth.\",\n      \"evidence\": \"Oocyte conditional knockout with cumulus-cell transcriptomics, ovarian histology, and hormone signaling assays\",\n      \"pmids\": [\"31676962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the key paracrine factors not narrowed\", \"Direct CXXC1 targets among paracrine genes not ChIP-validated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined CXXC1's meiotic requirement in spermatogenesis, linking H3K4me3 maintenance to transcriptional timing, DSB repair, and crossover formation.\",\n      \"evidence\": \"Stra8-Cre conditional knockout with H3K4me3/DMC1 ChIP-seq and meiotic spread analysis\",\n      \"pmids\": [\"32094118\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apparent tension with the negative fertility study (#13) regarding meiotic requirement not reconciled\", \"Direct cause of crossover defect not isolated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed CXXC1 orchestrates multiple epigenetic layers in oocytes—H3K4me3, DNA methylation, H3K27me3, H2AK119ub1—and acts non-redundantly with MLL2.\",\n      \"evidence\": \"Oocyte conditional knockout with CUT&TAG and whole-genome bisulfite sequencing\",\n      \"pmids\": [\"33621320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal hierarchy among the affected marks not established\", \"Direct versus secondary effects on H3K27me3/H2AK119ub1 unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended CXXC1's CD4+ T-cell role to phase-specific late re-expression of TCR-modulated genes affecting Th1/Th2 programs and inflammation.\",\n      \"evidence\": \"T-cell conditional knockout with transcriptomics and in vivo airway inflammation\",\n      \"pmids\": [\"33433611\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding to Trib3/Klf2 not shown by ChIP\", \"Mechanism of temporal control of re-expression unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked CXXC1-maintained H3K4me3 to maternal mRNA translation/decay and an aging timer in oocytes.\",\n      \"evidence\": \"Oocyte conditional knockout with scRNA-seq and H3K4me3 profiling in young versus aged oocytes\",\n      \"pmids\": [\"35680896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic coupling of H3K4me3 to mRNA decay competence not defined\", \"Aging-associated CXXC1 decline is correlative\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a transcription-factor-directed mode of recruitment, with CXXC1 physically interacting with FOXP3 and co-occupying Treg program loci to set H3K4me3 and immunosuppressive function.\",\n      \"evidence\": \"Treg conditional knockout with co-IP, CUT&TAG for CXXC1/H3K4me3, and FOXP3 ChIP\",\n      \"pmids\": [\"40183773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FOXP3 recruits CXXC1 or vice versa not resolved\", \"Interaction interface not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed conservation of CXXC1 function in zygotic genome activation, pre-marking CpG-dense hypomethylated loci with H3K4me3 for ZGA in Xenopus.\",\n      \"evidence\": \"Xenopus loss-of-function with developmental-stage H3K4me3 ChIP-seq and ZGA transcriptomics\",\n      \"pmids\": [\"41419741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct targets beyond Pou5f3.2 not delineated\", \"Single ortholog system; mammalian ZGA generality not tested here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated CXXC1/Set1C dependency in cancer, coupling H3K4me3 maintenance to MYC/E2F-driven proliferation in melanoma.\",\n      \"evidence\": \"CRISPR depletion in melanoma lines with H3K4me3 ChIP-seq, transcriptional profiling, and dependency mapping (preprint)\",\n      \"pmids\": [\"41726895\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab\", \"Direct versus indirect effects on MYC/E2F programs not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CXXC1's intrinsic CpG-reading specificity is integrated with transcription-factor-guided recruitment (e.g., FOXP3) to achieve locus-selective H3K4me3, and how this is reconciled with its DNMT1-dependent DNA-methylation maintenance role, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contributions of CXXC DNA binding versus partner-TF recruitment at endogenous loci unquantified\", \"Mechanism connecting H3K4me3 deposition to DNMT1 stability undefined\", \"Structural basis of partner interactions not determined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 5, 21]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [2, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5, 14, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 8, 15]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [10, 12, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 15, 22]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"complexes\": [\"SETD1A/Set1C (COMPASS) H3K4 methyltransferase complex\"],\n    \"partners\": [\"SETD1A\", \"PRDM9\", \"REC8\", \"SYCP3\", \"SYCP1\", \"IHO1\", \"FOXP3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}