{"gene":"TET1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2009,"finding":"TET1 is a 2-oxoglutarate (2OG)- and Fe(II)-dependent dioxygenase that catalyzes the conversion of 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC) in DNA, both in cultured cells and in vitro. RNAi-mediated depletion of TET1 decreases 5hmC levels in mouse embryonic stem cells.","method":"In vitro enzymatic assay, RNAi knockdown with 5hmC quantification, computational homology analysis","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of enzymatic activity, replicated across multiple labs, foundational discovery paper","pmids":["19372391"],"is_preprint":false},{"year":2011,"finding":"TET1 binds throughout the genome of embryonic stem cells, predominantly at CpG-rich transcription start sites and gene bodies. TET1 associates and co-localizes with the SIN3A co-repressor complex, indicating a role in transcriptional repression independent of or in addition to its catalytic activity.","method":"ChIP-seq genome-wide binding analysis, co-immunoprecipitation with SIN3A","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and genome-wide ChIP-seq in ESCs, replicated in subsequent studies","pmids":["21490601"],"is_preprint":false},{"year":2011,"finding":"Tet1 and Tet2 are Oct4-regulated enzymes in mouse ESCs. Tet1 depletion diminishes expression of the Nodal antagonist Lefty1, leading to hyperactive Nodal signaling and skewed differentiation into endoderm-mesoderm lineage, placing Tet1 upstream of Nodal/Lefty1 signaling in ESC lineage specification.","method":"RNAi knockdown, embryoid body differentiation assay, gene expression analysis, mouse chimera experiments","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean RNAi with defined cellular phenotype and pathway placement, replicated in vivo","pmids":["21295276"],"is_preprint":false},{"year":2013,"finding":"TALE-TET1 fusion proteins (TALE repeat arrays fused to the TET1 hydroxylase catalytic domain) can achieve targeted demethylation of specific CpG positions in human cells, and modification of methylated promoter CpGs leads to substantial increases in endogenous gene expression.","method":"TALE-TET1 fusion protein targeting, bisulfite sequencing, gene expression analysis","journal":"Nature biotechnology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in-cell demethylation with functional readout, multiple loci tested","pmids":["24108092"],"is_preprint":false},{"year":2013,"finding":"Depleting HMGA2 induces TET1 expression; TET1 then binds and demethylates its own promoter and the promoters of HOXA genes (including HOXA7 and HOXA9), establishing a HMGA2-TET1-HOXA9 pathway that suppresses breast tumor growth and metastasis.","method":"RNAi knockdown, ChIP, bisulfite sequencing, mouse xenograft tumor model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and bisulfite sequencing in single lab with in vivo validation, pathway defined by loss-of-function","pmids":["23716660"],"is_preprint":false},{"year":2016,"finding":"TET1 and TDG physically interact to oxidize and excise 5mC; biochemical reconstitution demonstrated that the TET1-TDG-BER system is capable of productive DNA demethylation. The mechanism ensures sequential demethylation of symmetrically methylated CpGs, avoiding double-strand break formation.","method":"Biochemical reconstitution, co-immunoprecipitation, in vitro enzymatic assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — full biochemical reconstitution of TET1-TDG-BER pathway with multiple orthogonal methods","pmids":["26932196"],"is_preprint":false},{"year":2016,"finding":"The full-length TET1 isoform (TET1e) bearing the CXXC domain is restricted to early embryos, ESCs, and PGCs, while a short isoform (TET1s) lacking the N-terminal CXXC domain is expressed in somatic cells. Global chromatin binding (not targeted CGI binding) correlates with TET1-mediated demethylation; mice expressing only Tet1s fail to erase imprints in PGCs and display developmental defects.","method":"Isoform-specific expression analysis, ChIP-seq, bisulfite sequencing, mouse knockin genetics","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic mouse models combined with genome-wide chromatin profiling and bisulfite sequencing","pmids":["27916660"],"is_preprint":false},{"year":2016,"finding":"dCas9-SunTag fused to scFv-TET1 catalytic domain achieves targeted DNA demethylation (>50% efficiency at 7/9 loci tested) in cell culture and in vivo in mouse fetuses, causing demethylation-dependent gene upregulation at demethylated regulatory regions.","method":"dCas9-SunTag-scFv-TET1 fusion, bisulfite sequencing, gene expression analysis, in vivo mouse experiments","journal":"Nature biotechnology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct functional reconstitution with targeted catalytic domain in multiple cell types and in vivo","pmids":["27571369"],"is_preprint":false},{"year":2015,"finding":"GADD45a physically interacts with TET1 and functionally cooperates with it in methylcytosine processing. GADD45a requires endogenous TET1 for reporter demethylation, and TET1 hyperinduces 5hmC in the presence of GADD45a while reducing 5fC and 5caC levels, suggesting GADD45a promotes TET1 activity and enhances subsequent oxidized base removal.","method":"Co-immunoprecipitation, reporter demethylation assay, 5hmC/5fC/5caC quantification, knockdown experiments","journal":"Differentiation; research in biological diversity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional reporter assay and multiple modification measurements, single lab","pmids":["26546041"],"is_preprint":false},{"year":2019,"finding":"GADD45A binds directly to R-loops at CpG island promoters and mediates local DNA demethylation by recruiting TET1. R-loop formation at the TCF21 promoter by lncRNA TARID enables GADD45A binding, which recruits TET1 to drive demethylation. Genomic profiling in ESCs identified thousands of R-loop-dependent TET1 binding sites at CGIs.","method":"Direct R-loop binding assays, Co-IP, genome-wide TET1 ChIP-seq, RNase H1 manipulation, 5hmC profiling","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (direct binding, ChIP-seq, genome-wide profiling), replicated mechanistic connection","pmids":["30617255"],"is_preprint":false},{"year":2018,"finding":"DNMT3A (specifically DNMT3A1) and TET1 function in a complementary and competitive manner in mouse ESCs: TET1 is enriched at proximal promoters and canyons where DNMT3A1 is excluded, and deletion of Tet1 increases DNMT3A1 binding. TET1 and DNMT3A1 co-regulate PRC2-mediated H3K27me3 enrichment at bivalent promoters.","method":"ChIP-seq, whole-genome bisulfite sequencing, knockout mouse ESCs, transcriptome analysis","journal":"Genome biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq in multiple KO cell lines with multiple orthogonal approaches","pmids":["30001199"],"is_preprint":false},{"year":2018,"finding":"Sin3a interacts with Tet1 (via residues Phe147 and Phe182 in the PAH1 domain of Sin3a) to function as a transcriptional coactivator of Lefty1 by demethylating its promoter. Sin3a-Tet1 co-occupancy facilitates transcription of a set of co-target genes in mouse ESCs.","method":"Co-immunoprecipitation, site-directed mutagenesis of Sin3a, ChIP-seq, MeDIP-seq, luciferase reporter assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP with mutagenesis, genome-wide ChIP-seq, and functional reporter assays in single lab","pmids":["29733394"],"is_preprint":false},{"year":2022,"finding":"Tet1 regulates H3K27 modification and ESC biology through a non-catalytic mechanism: loss of Tet1 (but not loss of catalytic activity) causes aberrant upregulation of bivalent developmental genes, impaired enrichment of PRC2 and Sin3a at bivalent promoters, reduced H3K27me3 and deacetylation, without changes in DNA methylation. Tet1 physically occupies genomic loci overlapping with PRC2 and Sin3a.","method":"Catalytic-inactive knockin vs. knockout ESCs and mice, ChIP-seq, RNA-seq, bisulfite sequencing","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic separation of catalytic vs. non-catalytic function using knockin and KO models with multiple orthogonal readouts","pmids":["35150568"],"is_preprint":false},{"year":2022,"finding":"FMRP promotes transcription-coupled homologous recombination by interacting with both the m5C writer TRDMT1 and the m5C eraser TET1. FMRP displays higher affinity for DNA:RNA hybrids containing m5C-modified RNA and facilitates demethylation of m5C RNA by TET1 in vitro, acting as a coordinator between writer and eraser.","method":"Co-immunoprecipitation, in vitro m5C demethylation assay, domain deletion mutants, DNA repair assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of TET1-mediated RNA demethylation, multiple domain mutants tested, single lab with orthogonal methods","pmids":["35290126"],"is_preprint":false},{"year":2014,"finding":"Oncogenic KRAS suppresses TET1 expression via the ERK signaling pathway, reducing TET1 chromatin occupancy at tumor suppressor gene (TSG) promoters and increasing DNA methylation. KRAS/TET1 double knockdown bypasses KRAS dependence, establishing TET1 suppression as required for KRAS-mediated cellular transformation.","method":"RNAi knockdown, ERK pathway inhibition, ChIP, bisulfite sequencing, colony formation assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via double knockdown, ChIP, and bisulfite sequencing, single lab","pmids":["25466250"],"is_preprint":false},{"year":2016,"finding":"FOXA1 physically interacts with TET1 through TET1's CXXC domain, and FOXA1 binding induces TET1 expression via direct binding to its cis-regulatory elements. TET1 co-occupies FOXA1-dependent enhancers and mediates local DNA demethylation and H3K4 methylation in a feed-forward loop.","method":"Co-immunoprecipitation, ChIP-seq, bisulfite sequencing, siRNA knockdown","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain identification, ChIP-seq, single lab","pmids":["27257062"],"is_preprint":false},{"year":2018,"finding":"ETV2 directly interacts with TET1 and TET2 (demonstrated by immunoprecipitation); adenoviral expression of ETV2-TET1/TET2 complexes demethylated the Robo4 promoter and induced Robo4 expression in non-endothelial cells, establishing that ETV2-TET1/TET2 complexes drive endothelial cell-specific gene expression through promoter demethylation.","method":"Co-immunoprecipitation, adenoviral overexpression, bisulfite sequencing, gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional demethylation readout, single lab","pmids":["29618782"],"is_preprint":false},{"year":2015,"finding":"DAZL, an RNA-binding protein, associates with Tet1 mRNA and enhances its translation. DAZL overexpression in ESCs elevates TET1 protein levels and increases global 5hmC; Dazl null mutation severely stunts 2i-mediated TET1 induction and hydroxymethylation, placing DAZL as a post-transcriptional regulator of TET1.","method":"RNA immunoprecipitation (RIP), polysome profiling, Dazl null mutation, 5hmC quantification","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP with genetic loss-of-function validation, single lab","pmids":["26077710"],"is_preprint":false},{"year":2020,"finding":"NONO directly interacts with TET1 via its DNA binding domain and recruits TET1 to genomic loci to regulate 5hmC levels. Nono deletion causes significant dissociation of TET1 from chromatin and dysregulation of DNA hydroxymethylation at neuronal genes, impairing neuronal differentiation of mESCs.","method":"Co-immunoprecipitation with domain mapping, ChIP-seq, 5hmC profiling, Nono KO rescue experiments","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain identification, genome-wide 5hmC profiling, single lab","pmids":["32286661"],"is_preprint":false},{"year":2022,"finding":"Using a proteomics approach, PSPC1 was identified as a TET1 interactor in ESCs. TET1 and PSPC1 co-occupy bivalent gene promoters overlapping with PRC2; TET1-PSPC1 maintain PRC2 chromatin occupancy at bivalent promoters during ESC-to-EpiLC transition, while lncRNA Neat1 activates bivalent genes by promoting PRC2 binding to mRNAs.","method":"TET1 interactome proteomics, ChIP-seq, genome-wide location analysis, PSPC1 knockdown","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics-based interactome with ChIP-seq validation, single lab","pmids":["35675764"],"is_preprint":false},{"year":2020,"finding":"TET1 acts as an autonomous repressor of thermogenic genes (Ucp1, Ppargc1a) in beige adipocytes through a mechanism that is largely DNA demethylase-independent; instead, TET1 coordinates with HDAC1 to mediate epigenetic repression. Adipose-selective Tet1 knockout improves cold tolerance and protects against diet-induced obesity.","method":"Adipose-specific Tet1 KO (Fabp4-Cre), Co-IP with HDAC1, gene expression analysis, thermogenic phenotyping","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined phenotype, Co-IP demonstrating HDAC1 interaction, single lab","pmids":["32855402"],"is_preprint":false},{"year":2021,"finding":"TET1 physically interacts with SIRT1 via its C-terminal domain and activates SIRT1 deacetylase activity, regulating acetylation-dependent cellular translocation of transcription factors PGC-1α and FOXO1, thereby activating hepatic gluconeogenic gene expression. The AMPK-TET1-SIRT1 axis mediates fasting-induced gluconeogenesis.","method":"Co-immunoprecipitation, domain mapping, deacetylase activity assay, Tet1 heterozygous mouse liver analysis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping and enzymatic activity assay, genetic mouse model, single lab","pmids":["34738906"],"is_preprint":false},{"year":2022,"finding":"The Tet1 short isoform (Tet1s) but not full-length Tet1 is recruited to late-replicating heterochromatin via ubiquitination by CRL4(VprBP) and subsequent recognition by Uhrf1. The CXXC zinc finger domain of full-length Tet1 prevents heterochromatin targeting. This isoform-specific targeting leads to spreading of 5mC oxidation to heterochromatin, LINE1 activation, and chromatin decondensation.","method":"Live-cell imaging during DNA replication, Co-IP, ubiquitination assay, domain deletion mutants, 5mC/5hmC profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (live imaging, Co-IP, ubiquitination, domain mutants) in single rigorous study","pmids":["36056023"],"is_preprint":false},{"year":2022,"finding":"TET1 dioxygenase is required for FOXA2-associated chromatin remodeling in pancreatic β-cell differentiation. TET1 and FOXA2 physically interact in endodermal lineage intermediates; full-length TET1 (but not TET1 catalytic domain alone) rescues β-cell differentiation in TET-deficient hESCs.","method":"Co-immunoprecipitation, TET1/2/3 triple knockout hESCs, whole-genome methylation profiling, FOXA2 ChIP-seq, differentiation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, triple KO hESC system with genome-wide profiling, multiple differentiation readouts, single lab with orthogonal methods","pmids":["35798741"],"is_preprint":false},{"year":2016,"finding":"Tet1-mediated DNA hydroxymethylation in intestinal stem cells (ISCs) is required for Wnt signaling. Tet1-deficient mice display reduced numbers of proliferative intestinal cells, reduced organoid-forming capacity, and decreased expression of Wnt target genes (Axin2, Lgr5) correlating with lower 5hmC levels at their promoters.","method":"Tet1 KO mouse, genome-wide 5hmC mapping (hMeDIP-seq), quantitative gene expression, organoid assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with genome-wide 5hmC profiling and defined Wnt pathway placement","pmids":["27856615"],"is_preprint":false},{"year":2014,"finding":"Hypoxia transcriptionally activates TET1 in a HIF-1-dependent manner, leading to increased global 5hmC levels and accumulation of 5hmC at hypoxia response element-containing loci, facilitating DNA demethylation and HIF binding. Full induction of hypoxia-responsive genes requires TET1.","method":"TET1 knockdown, 5hmC genome-wide mapping, HIF-1 inhibition, gene expression analysis under hypoxia","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined pathway placement, 5hmC profiling, single lab","pmids":["24835990"],"is_preprint":false},{"year":2018,"finding":"NF-κB p65 directly binds the TET1 promoter to repress TET1 transcription in breast cancer cells, establishing immune signaling as an upstream regulator of TET1 expression and 5hmC levels.","method":"ChIP showing p65 binding to TET1 promoter, NF-κB activation/inhibition experiments, in vitro and in vivo mouse studies","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP evidence of p65 binding TET1 promoter with functional validation, single lab","pmids":["29938218"],"is_preprint":false},{"year":2020,"finding":"PARP1 interacts with TET1 protein, and PARP enzymes establish H3K4me3 marks at the TET1 promoter. PARP inhibitor Olaparib abrogates TET1 expression, induces loss of 5hmC marks, and antagonizes leukemic T-ALL growth. TET1 promotes T-ALL growth through its catalytic activity maintaining global 5hmC.","method":"Co-immunoprecipitation of PARP1-TET1, ChIP for H3K4me3 at TET1 promoter, TET1 KO mouse, Olaparib treatment in vivo","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional in vivo KO and drug treatment data, single lab","pmids":["32409690"],"is_preprint":false},{"year":2016,"finding":"Hypermethylation of DNA methylation canyons is a key genomic consequence of Tet1/Tet2 double knockout; canyon hypermethylation coincides with disturbed regulation of associated genes, suggesting Tet-dependent demethylation maintains canyon boundaries and prevents invasive methylation.","method":"Whole-genome bisulfite sequencing, RNA-seq in Tet1/Tet2 DKO mouse embryonic fibroblasts","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide methylome in genetic DKO model, single lab","pmids":["26598602"],"is_preprint":false},{"year":2022,"finding":"TET1 and TET2 exhibit pronounced flanking sequence effects on catalytic activity (20-fold for TET1, 70-fold for TET2). TET1 and TET2 show similar flanking sequence preferences for both 5mC and 5hmC substrates. These preferences are reflected in genome-wide patterns of 5hmC and DNA demethylation in human and mouse cells.","method":"In vitro enzymatic assay with randomized flanking sequence libraries, single-molecule readout","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro biochemical assay with library approach and single-molecule readout, single lab","pmids":["35075236"],"is_preprint":false},{"year":2021,"finding":"Tet1 is required for adult myelin repair; constitutive and inducible oligodendrocyte-specific ablation of Tet1 (but not Tet2) recapitulates age-related decline in remyelination. TET1 targets include Slc gene family members (notably SLC12A2), whose expression is higher in Tet1-overexpressing cells and lower in old or Tet1-KO mice.","method":"Oligodendrocyte-specific conditional KO, 5hmC profiling, transcriptomics, demyelination lesion model, zebrafish slc12a2b mutants","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible lineage-specific KO with genome-wide 5hmC profiling and cross-species validation","pmids":["34099715"],"is_preprint":false},{"year":2020,"finding":"DSCR1 binds to TET1 introns to regulate splicing of TET1, modulating TET1 protein levels. TET1 in turn controls demethylation of the miR-124 promoter to modulate miR-124 expression in adult hippocampal neurogenesis. Correcting TET1 levels in DSCR1 KO mice is sufficient to prevent defective neurogenesis.","method":"DSCR1 KO mouse, RNA splicing analysis, TET1 level correction, 5hmC profiling at miR-124 promoter, adult neurogenesis assays","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue experiments with defined pathway (DSCR1→TET1→miR-124), single lab","pmids":["31304631"],"is_preprint":false},{"year":2016,"finding":"ERK/c-Jun signaling recruits Tet1 to the EBV Zta promoter; c-Jun interacts with Tet1 (shown by Co-IP) and facilitates Tet1 binding to Zta, leading to promoter demethylation, Zta expression, and EBV reactivation. Tet1 knockdown attenuates TPA-induced Zta demethylation and EBV reactivation.","method":"Co-immunoprecipitation of c-Jun and Tet1, ChIP, bisulfite sequencing, siRNA knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ChIP and bisulfite sequencing, functional knockdown, single lab","pmids":["27708396"],"is_preprint":false},{"year":2019,"finding":"TET1 recruits co-repressor proteins SIN3A and the histone lysine methyltransferase EZH2 to osteogenic genes in human mesenchymal stem cells, acting as a repressor of both osteogenesis and adipogenesis.","method":"siRNA knockdown, Co-IP of TET1 with SIN3A and EZH2, ChIP, differentiation assays","journal":"Epigenetics & chromatin","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with functional differentiation assays, single lab","pmids":["30606231"],"is_preprint":false},{"year":2021,"finding":"Tet1 promotes demethylation of the Dll3 and Notch1 promoters in hippocampal neural stem cells; Tet1 downregulation in FGR causes hypermethylation of these promoters and inhibition of Notch signaling, reducing NSC proliferation. Tet1 overexpression activates Notch signaling and rescues neurogenesis deficits.","method":"Tet1 KO/overexpression in FGR mouse model, bisulfite sequencing, Notch signaling assays, neurogenesis quantification","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined pathway (Tet1→Notch via Dll3/Notch1 demethylation) with loss- and gain-of-function, single lab","pmids":["34731622"],"is_preprint":false},{"year":2022,"finding":"Tet1 loss (but not catalytic inactivation) in ESCs leads to upregulation of p21/Cdkn1a through loss of Tet1-dependent PRC2 (Ezh2) and H3K27me3 enrichment at the p21 promoter, causing delayed G1 cell cycle progression. Tet1 directly occupies the p21 promoter overlapping with H3K27me3.","method":"Tet1 KO vs. catalytic-mutant mESCs, ChIP for Ezh2 and H3K27me3 at p21 promoter, p21 knockdown rescue, cell cycle analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic separation of catalytic vs. structural function with ChIP mechanistic evidence, single lab","pmids":["35456045"],"is_preprint":false},{"year":2021,"finding":"Tet1 is essential for deposition of 5hmC and facultative histone marks H3K27me3 and H2AK119ub at pericentromeric heterochromatin (PCH), and recruits RING1B (PRC1 component) to PCH. This TET1-dependent mechanism underlies chromocenter clustering in DNA hypomethylated cells via liquid-liquid phase separation.","method":"Tet1 KO ESCs, 5hmC ChIP-seq at PCH, H3K27me3 and H2AK119ub ChIP, RING1B co-localization, phase separation assays","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Tet1 KO with multiple ChIP analyses and phase separation experiments, single lab","pmids":["34166371"],"is_preprint":false},{"year":2023,"finding":"Tet1 reduces 5mC levels in an enzymatic activity-dependent manner at the promoters of Sod1 and Sod2 to promote their expression in kidney, thereby reducing injury-induced excessive ROS and acute kidney injury.","method":"Tet1 KO mice, bisulfite sequencing of Sod1/Sod2 promoters, ChIP, ROS quantification, I/R and UUO injury models","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with bisulfite sequencing and ChIP at specific target loci, single lab","pmids":["37908721"],"is_preprint":false},{"year":2020,"finding":"Morphine and naloxone directly bind to TET1 protein via three key residues (1880-1882) and inhibit its DNA demethylation activity while facilitating neural stem cell proliferation through a receptor-independent, TET1-dependent pathway.","method":"Molecular docking, direct binding assay, TET1 demethylation activity assay with opioids, TET1 knockdown, NSC proliferation assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding and in vitro enzymatic inhibition with domain identification, single lab","pmids":["32187535"],"is_preprint":false},{"year":2024,"finding":"ZFP281 and TET1 co-occupy gene promoters in a manner dependent on R-loop formation at ZFP281-targeted gene promoters; this co-occupancy undergoes bimodal dynamics during naive-formative-primed pluripotency transitions to regulate DNA methylation and gene expression.","method":"Zfp281 KO and degron knockin cell models, ChIP-seq co-occupancy analysis, R-loop manipulation","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide co-occupancy with genetic perturbation models, single lab","pmids":["38237590"],"is_preprint":false}],"current_model":"TET1 is a 2-oxoglutarate- and Fe(II)-dependent dioxygenase that iteratively oxidizes 5-methylcytosine to 5-hydroxymethylcytosine (and further to 5fC and 5caC), initiating DNA demethylation via TDG-BER; beyond its catalytic role, TET1 functions non-enzymatically by scaffolding repressive complexes (PRC2/Sin3a/HDAC1) at bivalent and developmental gene promoters to regulate H3K27me3 and gene silencing, and is recruited to specific genomic loci through interactions with partners including GADD45A (via R-loops), FOXA1, NONO, PSPC1, c-Jun, FOXA2, SIRT1, and ETV2, placing TET1 as both an epigenetic writer/eraser and a structural chromatin organizer controlling pluripotency, lineage specification, neurogenesis, myelination, metabolism, and immune responses."},"narrative":{"mechanistic_narrative":"TET1 is a 2-oxoglutarate- and Fe(II)-dependent dioxygenase that oxidizes 5-methylcytosine to 5-hydroxymethylcytosine in DNA, initiating active DNA demethylation that shapes pluripotency, lineage specification, and tissue homeostasis [PMID:19372391, PMID:35075236]. Its catalytic output feeds the TET1-TDG-base-excision-repair pathway, which sequentially processes symmetrically methylated CpGs to complete demethylation without generating double-strand breaks [PMID:26932196]. In embryonic stem cells TET1 binds genome-wide at CpG-rich transcription start sites and gene bodies, where it operates complementarily and competitively with the de novo methyltransferase DNMT3A1 to set methylation boundaries and protect DNA methylation canyons [PMID:21490601, PMID:30001199, PMID:26598602]. Beyond catalysis, TET1 acts as a non-enzymatic chromatin scaffold: loss of TET1 — but not loss of its catalytic activity — derepresses bivalent developmental genes by impairing recruitment of PRC2 and the SIN3A/HDAC1 co-repressor machinery and reducing H3K27me3, and this structural function also restrains cell-cycle genes such as p21/Cdkn1a [PMID:29733394, PMID:35150568, PMID:35456045]. TET1 is recruited to defined loci through partners including GADD45A acting at R-loops, NONO, PSPC1, FOXA1, FOXA2, ETV2, and ZFP281, directing demethylation and downstream programs in development and differentiation [PMID:30617255, PMID:27257062, PMID:32286661, PMID:35675764, PMID:35798741, PMID:38237590]. Two isoforms partition these activities: full-length TET1 bearing the CXXC domain is restricted to early embryos, ESCs, and PGCs, whereas the short isoform TET1s lacking CXXC is targeted to late-replicating heterochromatin via CRL4(VprBP)-mediated ubiquitination and UHRF1 recognition, spreading 5mC oxidation and activating LINE1 [PMID:27916660, PMID:36056023]. Through these mechanisms TET1 controls Wnt and Notch signaling in stem cell niches, neurogenesis and myelin repair, metabolic and antioxidant gene expression, and is engineerable as a programmable demethylase via TALE and dCas9 fusions [PMID:27856615, PMID:34731622, PMID:34099715, PMID:24108092, PMID:27571369]. TET1 expression is itself regulated by oncogenic KRAS/ERK, HIF-1, NF-κB, and post-transcriptional inputs, positioning it within disease contexts including cancer and leukemia [PMID:25466250, PMID:24835990, PMID:29938218, PMID:32409690].","teleology":[{"year":2009,"claim":"Established the founding biochemical identity of TET1 by showing it is an enzyme that converts 5mC to 5hmC, defining a new chemical step in DNA modification.","evidence":"In vitro enzymatic assay and RNAi depletion with 5hmC quantification in mouse ESCs","pmids":["19372391"],"confidence":"High","gaps":["Did not resolve downstream fate of 5hmC","Genomic targeting and recruitment mechanism unaddressed"]},{"year":2011,"claim":"Showed TET1 genomic binding is concentrated at CpG-rich promoters and that it physically associates with the SIN3A co-repressor, the first evidence that TET1 functions in transcriptional repression beyond catalysis.","evidence":"Genome-wide ChIP-seq and co-immunoprecipitation with SIN3A in ESCs","pmids":["21490601"],"confidence":"High","gaps":["Did not separate catalytic from scaffolding contributions","Mechanism of SIN3A-directed repression undefined"]},{"year":2011,"claim":"Placed TET1 upstream of Nodal/Lefty1 signaling in ESC lineage choice, linking the enzyme to developmental gene regulation.","evidence":"RNAi knockdown, embryoid body differentiation, and mouse chimera assays","pmids":["21295276"],"confidence":"High","gaps":["Direct demethylation target at Lefty1 not yet mapped at this stage","Catalytic vs structural requirement unresolved"]},{"year":2013,"claim":"Demonstrated TET1 catalytic activity is sufficient for targeted, locus-specific demethylation and gene activation, validating it as a programmable epigenetic effector.","evidence":"TALE-TET1 catalytic-domain fusions with bisulfite sequencing and expression readout in human cells","pmids":["24108092"],"confidence":"High","gaps":["Off-target demethylation not fully quantified","Endogenous recruitment determinants not addressed"]},{"year":2016,"claim":"Reconstituted the TET1-TDG-BER pathway biochemically, explaining how iterative oxidation couples to base excision to achieve demethylation without double-strand breaks.","evidence":"Biochemical reconstitution, Co-IP, and in vitro enzymatic assays","pmids":["26932196"],"confidence":"High","gaps":["In vivo coordination of strand asymmetry not directly visualized","Regulation of TDG handoff in chromatin context unknown"]},{"year":2016,"claim":"Distinguished isoform-specific function, showing the CXXC-bearing full-length TET1 is developmentally restricted and required for imprint erasure, while a short somatic isoform exists.","evidence":"Isoform expression analysis, ChIP-seq, bisulfite sequencing, and mouse knockin genetics","pmids":["27916660"],"confidence":"High","gaps":["Targeting mechanism of the short isoform not yet defined here","Functional differences in somatic tissues incompletely mapped"]},{"year":2016,"claim":"Showed TET1 flanking-sequence preferences and demonstrated dCas9-SunTag-TET1 catalytic targeting works in vivo, advancing both substrate understanding and editing utility.","evidence":"dCas9-SunTag-scFv-TET1 fusion with bisulfite sequencing in cells and mouse fetuses","pmids":["27571369"],"confidence":"High","gaps":["Durability of demethylation over divisions not established","Endogenous targeting still distinct from engineered systems"]},{"year":2019,"claim":"Identified R-loops and GADD45A as a recruitment route, explaining how TET1 reaches specific CpG island promoters for demethylation.","evidence":"Direct R-loop binding assays, Co-IP, genome-wide TET1 ChIP-seq, and RNase H1 manipulation in ESCs","pmids":["30617255","26546041"],"confidence":"High","gaps":["Generality across all TET1 sites not established","How R-loop dynamics are regulated to time recruitment unclear"]},{"year":2018,"claim":"Defined the antagonistic and complementary relationship between TET1 and DNMT3A1 that establishes methylation boundaries and co-regulates PRC2-dependent H3K27me3 at bivalent promoters.","evidence":"ChIP-seq, whole-genome bisulfite sequencing, and transcriptomics in knockout mouse ESCs","pmids":["30001199","29733394"],"confidence":"High","gaps":["Mechanism of mutual exclusion at canyons not structurally resolved","Causal order of methylation and H3K27me3 changes incompletely separated"]},{"year":2022,"claim":"Genetically separated catalytic from non-catalytic TET1 function, establishing that scaffolding of PRC2/SIN3A and maintenance of H3K27me3 at bivalent and cell-cycle genes is demethylase-independent.","evidence":"Catalytic-inactive knockin versus knockout ESCs and mice with ChIP-seq, RNA-seq, and bisulfite sequencing","pmids":["35150568","35456045"],"confidence":"High","gaps":["Structural basis of PRC2/SIN3A bridging undefined","How non-catalytic occupancy is targeted independent of catalysis unclear"]},{"year":2022,"claim":"Revealed isoform-selective heterochromatin targeting whereby ubiquitinated TET1s is recognized by UHRF1 to oxidize and decondense heterochromatin and activate LINE1.","evidence":"Live-cell imaging, Co-IP, ubiquitination assays, and domain-deletion mutants with 5mC/5hmC profiling","pmids":["36056023"],"confidence":"High","gaps":["Physiological trigger for TET1s heterochromatin spreading unknown","Consequences of LINE1 activation in vivo not fully traced"]},{"year":2022,"claim":"Extended TET1 recruitment partners to NONO, PSPC1, FOXA2, and FMRP, linking it to neuronal gene control, bivalent promoter maintenance, β-cell differentiation, and m5C RNA demethylation.","evidence":"Co-IP with domain mapping, interactome proteomics, triple-KO hESC differentiation, and in vitro m5C demethylation assays","pmids":["32286661","35675764","35798741","35290126"],"confidence":"High","gaps":["Whether RNA m5C demethylation is a major in vivo TET1 function unresolved","Hierarchy among multiple recruitment partners at shared loci unclear"]},{"year":2023,"claim":"Consolidated tissue-level catalytic roles of TET1 across intestinal Wnt signaling, neural Notch signaling, myelin repair, antioxidant defense, and metabolic gene control through locus-specific demethylation.","evidence":"Lineage- and tissue-specific conditional knockouts with 5hmC profiling, bisulfite sequencing, and physiological injury or differentiation models","pmids":["27856615","34731622","34099715","37908721","32855402","34738906"],"confidence":"Medium","gaps":["Catalytic versus scaffolding contribution varies by tissue and is not uniformly dissected","Direct target sets incompletely defined in most tissues"]},{"year":2024,"claim":"Showed transcription-factor co-occupancy (ZFP281) at R-loop-dependent promoters dynamically reconfigures TET1 binding across pluripotency states.","evidence":"Zfp281 KO and degron models with ChIP-seq co-occupancy and R-loop manipulation","pmids":["38237590"],"confidence":"Medium","gaps":["Direct physical interaction between ZFP281 and TET1 not established","Functional output of redistributed binding on methylation incompletely mapped"]},{"year":null,"claim":"How the relative balance of TET1 catalytic versus scaffolding activity is selected at a given locus, and the structural basis by which TET1 bridges PRC2/SIN3A/HDAC1 repressive complexes, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of TET1-PRC2/SIN3A scaffolding","Unified logic governing catalytic vs non-catalytic mode switching is undefined","In vivo significance of RNA m5C demethylation versus DNA demethylation unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,5,29]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[0,5,7]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,22]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[12,1,33]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,12]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[1,22,36]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[12,10,36]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,23,24,30]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,11,33]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,27,26]}],"complexes":["SIN3A co-repressor complex","PRC2","TET1-TDG-BER demethylation complex"],"partners":["TDG","SIN3A","GADD45A","DNMT3A","NONO","PSPC1","FOXA1","EZH2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NFU7","full_name":"Methylcytosine dioxygenase TET1","aliases":["CXXC-type zinc finger protein 6","Leukemia-associated protein with a CXXC domain","Ten-eleven translocation 1 gene protein"],"length_aa":2136,"mass_kda":235.3,"function":"Dioxygenase that plays a key role in active DNA demethylation, by catalyzing the sequential oxidation of the modified genomic base 5-methylcytosine (5mC) into 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC) (PubMed:19372391, PubMed:21496894, PubMed:21778364, PubMed:35798741). In addition to its role in DNA demethylation, plays a more general role in chromatin regulation by recruiting histone modifying protein complexes to alter histone marks and chromatin accessibility, leading to both activation and repression of gene expression (PubMed:33833093). Plays therefore a role in many biological processes, including stem cell maintenance, T- and B-cell development, inflammation regulation, genomic imprinting, neural activity or DNA repair (PubMed:31278917). Involved in the balance between pluripotency and lineage commitment of cells and plays a role in embryonic stem cells maintenance and inner cell mass cell specification. Together with QSER1, plays an essential role in the protection and maintenance of transcriptional and developmental programs to inhibit the binding of DNMT3A/3B and therefore de novo methylation (PubMed:33833093). May play a role in pancreatic beta-cell specification during development. In this context, may function as an upstream epigenetic regulator of PAX4 presumably through direct recruitment by FOXA2 to a PAX4 enhancer to preserve its unmethylated status, thereby potentiating PAX4 expression to adopt beta-cell fate during endocrine lineage commitment (PubMed:35798741). Under DNA hypomethylation conditions, such as in female meiotic germ cells, may induce epigenetic reprogramming of pericentromeric heterochromatin (PCH), the constitutive heterochromatin of pericentromeric regions. PCH forms chromocenters in the interphase nucleus and chromocenters cluster at the prophase of meiosis. In this context, may also be essential for chromocenter clustering in a catalytic activity-independent manner, possibly through the recruitment polycomb repressive complex 1 (PRC1) to the chromocenters (By similarity). During embryonic development, may be required for normal meiotic progression in oocytes and meiotic gene activation (By similarity). 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) Dioxygenase that plays a key role in active DNA demethylation (PubMed:28531272). Binds to promoters, particularly to those with high CG content (By similarity). In hippocampal neurons, isoform 1 regulates the expression of a unique subset of genes compared to isoform 2, although some overlap exists between both isoforms, hence differentially regulates excitatory synaptic transmission (By similarity). In hippocampal neuron cell cultures, isoform 1 controls both miniature excitatory postsynaptic current amplitude and frequency (By similarity). Isoform 1 may regulate genes involved in hippocampal-dependent memory, leading to positive regulation of memory, contrary to isoform 2 that may decrease memory (By similarity) Dioxygenase that plays a key role in active DNA demethylation (PubMed:28531272). As isoform 1, binds to promoters, particularly to those with high CG content, however displays reduced global chromatin affinity compared with isoform 1, leading to decreased global DNA demethylation compared with isoform 1 (By similarity). Contrary to isoform 1, isoform 2 localizes during S phase to sites of ongoing DNA replication in heterochromatin, causing a significant de novo 5hmC formation, globally, and more so in heterochromatin, including LINE 1 interspersed DNA repeats leading to their activation (By similarity). In hippocampal neurons, isoform 2 regulates the expression of a unique subset of genes compared to isoform 1, although some overlap between both isoforms, hence differentially regulates excitatory synaptic transmission (By similarity). In hippocampal neuron cell cultures, isoform 2 controls miniature excitatory postsynaptic current frequency, but not amplitude (By similarity). Isoform 2 may regulate genes involved in hippocampal-dependent memory, leading to negative regulation of memory, contrary to isoform 1 that may improve memory (By similarity). In immature and partially differentiated gonadotrope cells, directly represses luteinizing hormone gene LHB expression and does not catalyze 5hmC at the gene promoter (By similarity)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q8NFU7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TET1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TET1","total_profiled":1310},"omim":[{"mim_id":"621198","title":"BEN DOMAIN-CONTAINING PROTEIN 5; BEND5","url":"https://www.omim.org/entry/621198"},{"mim_id":"620773","title":"PROLINE- AND SERINE-RICH PROTEIN 1; PROSER1","url":"https://www.omim.org/entry/620773"},{"mim_id":"619440","title":"GLUTAMINE- AND SERINE-RICH PROTEIN 1; QSER1","url":"https://www.omim.org/entry/619440"},{"mim_id":"616717","title":"TESTIS-EXPRESSED GENE 10; TEX10","url":"https://www.omim.org/entry/616717"},{"mim_id":"613555","title":"TET METHYLCYTOSINE DIOXYGENASE 3; TET3","url":"https://www.omim.org/entry/613555"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in some","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TET1"},"hgnc":{"alias_symbol":["LCX","KIAA1676","bA119F7.1"],"prev_symbol":["CXXC6"]},"alphafold":{"accession":"Q8NFU7","domains":[{"cath_id":"3.60.130.30","chopping":"1423-1768_1989-2078","consensus_level":"medium","plddt":92.864,"start":1423,"end":2078}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFU7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFU7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NFU7-F1-predicted_aligned_error_v6.png","plddt_mean":46.47},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TET1","jax_strain_url":"https://www.jax.org/strain/search?query=TET1"},"sequence":{"accession":"Q8NFU7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NFU7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NFU7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NFU7"}},"corpus_meta":[{"pmid":"19372391","id":"PMC_19372391","title":"Conversion 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RNAi-mediated depletion of TET1 decreases 5hmC levels in mouse embryonic stem cells.\",\n      \"method\": \"In vitro enzymatic assay, RNAi knockdown with 5hmC quantification, computational homology analysis\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of enzymatic activity, replicated across multiple labs, foundational discovery paper\",\n      \"pmids\": [\"19372391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TET1 binds throughout the genome of embryonic stem cells, predominantly at CpG-rich transcription start sites and gene bodies. TET1 associates and co-localizes with the SIN3A co-repressor complex, indicating a role in transcriptional repression independent of or in addition to its catalytic activity.\",\n      \"method\": \"ChIP-seq genome-wide binding analysis, co-immunoprecipitation with SIN3A\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and genome-wide ChIP-seq in ESCs, replicated in subsequent studies\",\n      \"pmids\": [\"21490601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Tet1 and Tet2 are Oct4-regulated enzymes in mouse ESCs. Tet1 depletion diminishes expression of the Nodal antagonist Lefty1, leading to hyperactive Nodal signaling and skewed differentiation into endoderm-mesoderm lineage, placing Tet1 upstream of Nodal/Lefty1 signaling in ESC lineage specification.\",\n      \"method\": \"RNAi knockdown, embryoid body differentiation assay, gene expression analysis, mouse chimera experiments\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean RNAi with defined cellular phenotype and pathway placement, replicated in vivo\",\n      \"pmids\": [\"21295276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TALE-TET1 fusion proteins (TALE repeat arrays fused to the TET1 hydroxylase catalytic domain) can achieve targeted demethylation of specific CpG positions in human cells, and modification of methylated promoter CpGs leads to substantial increases in endogenous gene expression.\",\n      \"method\": \"TALE-TET1 fusion protein targeting, bisulfite sequencing, gene expression analysis\",\n      \"journal\": \"Nature biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in-cell demethylation with functional readout, multiple loci tested\",\n      \"pmids\": [\"24108092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Depleting HMGA2 induces TET1 expression; TET1 then binds and demethylates its own promoter and the promoters of HOXA genes (including HOXA7 and HOXA9), establishing a HMGA2-TET1-HOXA9 pathway that suppresses breast tumor growth and metastasis.\",\n      \"method\": \"RNAi knockdown, ChIP, bisulfite sequencing, mouse xenograft tumor model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and bisulfite sequencing in single lab with in vivo validation, pathway defined by loss-of-function\",\n      \"pmids\": [\"23716660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TET1 and TDG physically interact to oxidize and excise 5mC; biochemical reconstitution demonstrated that the TET1-TDG-BER system is capable of productive DNA demethylation. The mechanism ensures sequential demethylation of symmetrically methylated CpGs, avoiding double-strand break formation.\",\n      \"method\": \"Biochemical reconstitution, co-immunoprecipitation, in vitro enzymatic assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full biochemical reconstitution of TET1-TDG-BER pathway with multiple orthogonal methods\",\n      \"pmids\": [\"26932196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The full-length TET1 isoform (TET1e) bearing the CXXC domain is restricted to early embryos, ESCs, and PGCs, while a short isoform (TET1s) lacking the N-terminal CXXC domain is expressed in somatic cells. Global chromatin binding (not targeted CGI binding) correlates with TET1-mediated demethylation; mice expressing only Tet1s fail to erase imprints in PGCs and display developmental defects.\",\n      \"method\": \"Isoform-specific expression analysis, ChIP-seq, bisulfite sequencing, mouse knockin genetics\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic mouse models combined with genome-wide chromatin profiling and bisulfite sequencing\",\n      \"pmids\": [\"27916660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"dCas9-SunTag fused to scFv-TET1 catalytic domain achieves targeted DNA demethylation (>50% efficiency at 7/9 loci tested) in cell culture and in vivo in mouse fetuses, causing demethylation-dependent gene upregulation at demethylated regulatory regions.\",\n      \"method\": \"dCas9-SunTag-scFv-TET1 fusion, bisulfite sequencing, gene expression analysis, in vivo mouse experiments\",\n      \"journal\": \"Nature biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct functional reconstitution with targeted catalytic domain in multiple cell types and in vivo\",\n      \"pmids\": [\"27571369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GADD45a physically interacts with TET1 and functionally cooperates with it in methylcytosine processing. GADD45a requires endogenous TET1 for reporter demethylation, and TET1 hyperinduces 5hmC in the presence of GADD45a while reducing 5fC and 5caC levels, suggesting GADD45a promotes TET1 activity and enhances subsequent oxidized base removal.\",\n      \"method\": \"Co-immunoprecipitation, reporter demethylation assay, 5hmC/5fC/5caC quantification, knockdown experiments\",\n      \"journal\": \"Differentiation; research in biological diversity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional reporter assay and multiple modification measurements, single lab\",\n      \"pmids\": [\"26546041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GADD45A binds directly to R-loops at CpG island promoters and mediates local DNA demethylation by recruiting TET1. R-loop formation at the TCF21 promoter by lncRNA TARID enables GADD45A binding, which recruits TET1 to drive demethylation. Genomic profiling in ESCs identified thousands of R-loop-dependent TET1 binding sites at CGIs.\",\n      \"method\": \"Direct R-loop binding assays, Co-IP, genome-wide TET1 ChIP-seq, RNase H1 manipulation, 5hmC profiling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (direct binding, ChIP-seq, genome-wide profiling), replicated mechanistic connection\",\n      \"pmids\": [\"30617255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DNMT3A (specifically DNMT3A1) and TET1 function in a complementary and competitive manner in mouse ESCs: TET1 is enriched at proximal promoters and canyons where DNMT3A1 is excluded, and deletion of Tet1 increases DNMT3A1 binding. TET1 and DNMT3A1 co-regulate PRC2-mediated H3K27me3 enrichment at bivalent promoters.\",\n      \"method\": \"ChIP-seq, whole-genome bisulfite sequencing, knockout mouse ESCs, transcriptome analysis\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq in multiple KO cell lines with multiple orthogonal approaches\",\n      \"pmids\": [\"30001199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sin3a interacts with Tet1 (via residues Phe147 and Phe182 in the PAH1 domain of Sin3a) to function as a transcriptional coactivator of Lefty1 by demethylating its promoter. Sin3a-Tet1 co-occupancy facilitates transcription of a set of co-target genes in mouse ESCs.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of Sin3a, ChIP-seq, MeDIP-seq, luciferase reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP with mutagenesis, genome-wide ChIP-seq, and functional reporter assays in single lab\",\n      \"pmids\": [\"29733394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tet1 regulates H3K27 modification and ESC biology through a non-catalytic mechanism: loss of Tet1 (but not loss of catalytic activity) causes aberrant upregulation of bivalent developmental genes, impaired enrichment of PRC2 and Sin3a at bivalent promoters, reduced H3K27me3 and deacetylation, without changes in DNA methylation. Tet1 physically occupies genomic loci overlapping with PRC2 and Sin3a.\",\n      \"method\": \"Catalytic-inactive knockin vs. knockout ESCs and mice, ChIP-seq, RNA-seq, bisulfite sequencing\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic separation of catalytic vs. non-catalytic function using knockin and KO models with multiple orthogonal readouts\",\n      \"pmids\": [\"35150568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FMRP promotes transcription-coupled homologous recombination by interacting with both the m5C writer TRDMT1 and the m5C eraser TET1. FMRP displays higher affinity for DNA:RNA hybrids containing m5C-modified RNA and facilitates demethylation of m5C RNA by TET1 in vitro, acting as a coordinator between writer and eraser.\",\n      \"method\": \"Co-immunoprecipitation, in vitro m5C demethylation assay, domain deletion mutants, DNA repair assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of TET1-mediated RNA demethylation, multiple domain mutants tested, single lab with orthogonal methods\",\n      \"pmids\": [\"35290126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Oncogenic KRAS suppresses TET1 expression via the ERK signaling pathway, reducing TET1 chromatin occupancy at tumor suppressor gene (TSG) promoters and increasing DNA methylation. KRAS/TET1 double knockdown bypasses KRAS dependence, establishing TET1 suppression as required for KRAS-mediated cellular transformation.\",\n      \"method\": \"RNAi knockdown, ERK pathway inhibition, ChIP, bisulfite sequencing, colony formation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via double knockdown, ChIP, and bisulfite sequencing, single lab\",\n      \"pmids\": [\"25466250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FOXA1 physically interacts with TET1 through TET1's CXXC domain, and FOXA1 binding induces TET1 expression via direct binding to its cis-regulatory elements. TET1 co-occupies FOXA1-dependent enhancers and mediates local DNA demethylation and H3K4 methylation in a feed-forward loop.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, bisulfite sequencing, siRNA knockdown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain identification, ChIP-seq, single lab\",\n      \"pmids\": [\"27257062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ETV2 directly interacts with TET1 and TET2 (demonstrated by immunoprecipitation); adenoviral expression of ETV2-TET1/TET2 complexes demethylated the Robo4 promoter and induced Robo4 expression in non-endothelial cells, establishing that ETV2-TET1/TET2 complexes drive endothelial cell-specific gene expression through promoter demethylation.\",\n      \"method\": \"Co-immunoprecipitation, adenoviral overexpression, bisulfite sequencing, gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional demethylation readout, single lab\",\n      \"pmids\": [\"29618782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DAZL, an RNA-binding protein, associates with Tet1 mRNA and enhances its translation. DAZL overexpression in ESCs elevates TET1 protein levels and increases global 5hmC; Dazl null mutation severely stunts 2i-mediated TET1 induction and hydroxymethylation, placing DAZL as a post-transcriptional regulator of TET1.\",\n      \"method\": \"RNA immunoprecipitation (RIP), polysome profiling, Dazl null mutation, 5hmC quantification\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP with genetic loss-of-function validation, single lab\",\n      \"pmids\": [\"26077710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NONO directly interacts with TET1 via its DNA binding domain and recruits TET1 to genomic loci to regulate 5hmC levels. Nono deletion causes significant dissociation of TET1 from chromatin and dysregulation of DNA hydroxymethylation at neuronal genes, impairing neuronal differentiation of mESCs.\",\n      \"method\": \"Co-immunoprecipitation with domain mapping, ChIP-seq, 5hmC profiling, Nono KO rescue experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain identification, genome-wide 5hmC profiling, single lab\",\n      \"pmids\": [\"32286661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Using a proteomics approach, PSPC1 was identified as a TET1 interactor in ESCs. TET1 and PSPC1 co-occupy bivalent gene promoters overlapping with PRC2; TET1-PSPC1 maintain PRC2 chromatin occupancy at bivalent promoters during ESC-to-EpiLC transition, while lncRNA Neat1 activates bivalent genes by promoting PRC2 binding to mRNAs.\",\n      \"method\": \"TET1 interactome proteomics, ChIP-seq, genome-wide location analysis, PSPC1 knockdown\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics-based interactome with ChIP-seq validation, single lab\",\n      \"pmids\": [\"35675764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TET1 acts as an autonomous repressor of thermogenic genes (Ucp1, Ppargc1a) in beige adipocytes through a mechanism that is largely DNA demethylase-independent; instead, TET1 coordinates with HDAC1 to mediate epigenetic repression. Adipose-selective Tet1 knockout improves cold tolerance and protects against diet-induced obesity.\",\n      \"method\": \"Adipose-specific Tet1 KO (Fabp4-Cre), Co-IP with HDAC1, gene expression analysis, thermogenic phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined phenotype, Co-IP demonstrating HDAC1 interaction, single lab\",\n      \"pmids\": [\"32855402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TET1 physically interacts with SIRT1 via its C-terminal domain and activates SIRT1 deacetylase activity, regulating acetylation-dependent cellular translocation of transcription factors PGC-1α and FOXO1, thereby activating hepatic gluconeogenic gene expression. The AMPK-TET1-SIRT1 axis mediates fasting-induced gluconeogenesis.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, deacetylase activity assay, Tet1 heterozygous mouse liver analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping and enzymatic activity assay, genetic mouse model, single lab\",\n      \"pmids\": [\"34738906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Tet1 short isoform (Tet1s) but not full-length Tet1 is recruited to late-replicating heterochromatin via ubiquitination by CRL4(VprBP) and subsequent recognition by Uhrf1. The CXXC zinc finger domain of full-length Tet1 prevents heterochromatin targeting. This isoform-specific targeting leads to spreading of 5mC oxidation to heterochromatin, LINE1 activation, and chromatin decondensation.\",\n      \"method\": \"Live-cell imaging during DNA replication, Co-IP, ubiquitination assay, domain deletion mutants, 5mC/5hmC profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (live imaging, Co-IP, ubiquitination, domain mutants) in single rigorous study\",\n      \"pmids\": [\"36056023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TET1 dioxygenase is required for FOXA2-associated chromatin remodeling in pancreatic β-cell differentiation. TET1 and FOXA2 physically interact in endodermal lineage intermediates; full-length TET1 (but not TET1 catalytic domain alone) rescues β-cell differentiation in TET-deficient hESCs.\",\n      \"method\": \"Co-immunoprecipitation, TET1/2/3 triple knockout hESCs, whole-genome methylation profiling, FOXA2 ChIP-seq, differentiation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, triple KO hESC system with genome-wide profiling, multiple differentiation readouts, single lab with orthogonal methods\",\n      \"pmids\": [\"35798741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Tet1-mediated DNA hydroxymethylation in intestinal stem cells (ISCs) is required for Wnt signaling. Tet1-deficient mice display reduced numbers of proliferative intestinal cells, reduced organoid-forming capacity, and decreased expression of Wnt target genes (Axin2, Lgr5) correlating with lower 5hmC levels at their promoters.\",\n      \"method\": \"Tet1 KO mouse, genome-wide 5hmC mapping (hMeDIP-seq), quantitative gene expression, organoid assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with genome-wide 5hmC profiling and defined Wnt pathway placement\",\n      \"pmids\": [\"27856615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Hypoxia transcriptionally activates TET1 in a HIF-1-dependent manner, leading to increased global 5hmC levels and accumulation of 5hmC at hypoxia response element-containing loci, facilitating DNA demethylation and HIF binding. Full induction of hypoxia-responsive genes requires TET1.\",\n      \"method\": \"TET1 knockdown, 5hmC genome-wide mapping, HIF-1 inhibition, gene expression analysis under hypoxia\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined pathway placement, 5hmC profiling, single lab\",\n      \"pmids\": [\"24835990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NF-κB p65 directly binds the TET1 promoter to repress TET1 transcription in breast cancer cells, establishing immune signaling as an upstream regulator of TET1 expression and 5hmC levels.\",\n      \"method\": \"ChIP showing p65 binding to TET1 promoter, NF-κB activation/inhibition experiments, in vitro and in vivo mouse studies\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP evidence of p65 binding TET1 promoter with functional validation, single lab\",\n      \"pmids\": [\"29938218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PARP1 interacts with TET1 protein, and PARP enzymes establish H3K4me3 marks at the TET1 promoter. PARP inhibitor Olaparib abrogates TET1 expression, induces loss of 5hmC marks, and antagonizes leukemic T-ALL growth. TET1 promotes T-ALL growth through its catalytic activity maintaining global 5hmC.\",\n      \"method\": \"Co-immunoprecipitation of PARP1-TET1, ChIP for H3K4me3 at TET1 promoter, TET1 KO mouse, Olaparib treatment in vivo\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional in vivo KO and drug treatment data, single lab\",\n      \"pmids\": [\"32409690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hypermethylation of DNA methylation canyons is a key genomic consequence of Tet1/Tet2 double knockout; canyon hypermethylation coincides with disturbed regulation of associated genes, suggesting Tet-dependent demethylation maintains canyon boundaries and prevents invasive methylation.\",\n      \"method\": \"Whole-genome bisulfite sequencing, RNA-seq in Tet1/Tet2 DKO mouse embryonic fibroblasts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide methylome in genetic DKO model, single lab\",\n      \"pmids\": [\"26598602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TET1 and TET2 exhibit pronounced flanking sequence effects on catalytic activity (20-fold for TET1, 70-fold for TET2). TET1 and TET2 show similar flanking sequence preferences for both 5mC and 5hmC substrates. These preferences are reflected in genome-wide patterns of 5hmC and DNA demethylation in human and mouse cells.\",\n      \"method\": \"In vitro enzymatic assay with randomized flanking sequence libraries, single-molecule readout\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro biochemical assay with library approach and single-molecule readout, single lab\",\n      \"pmids\": [\"35075236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tet1 is required for adult myelin repair; constitutive and inducible oligodendrocyte-specific ablation of Tet1 (but not Tet2) recapitulates age-related decline in remyelination. TET1 targets include Slc gene family members (notably SLC12A2), whose expression is higher in Tet1-overexpressing cells and lower in old or Tet1-KO mice.\",\n      \"method\": \"Oligodendrocyte-specific conditional KO, 5hmC profiling, transcriptomics, demyelination lesion model, zebrafish slc12a2b mutants\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible lineage-specific KO with genome-wide 5hmC profiling and cross-species validation\",\n      \"pmids\": [\"34099715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DSCR1 binds to TET1 introns to regulate splicing of TET1, modulating TET1 protein levels. TET1 in turn controls demethylation of the miR-124 promoter to modulate miR-124 expression in adult hippocampal neurogenesis. Correcting TET1 levels in DSCR1 KO mice is sufficient to prevent defective neurogenesis.\",\n      \"method\": \"DSCR1 KO mouse, RNA splicing analysis, TET1 level correction, 5hmC profiling at miR-124 promoter, adult neurogenesis assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue experiments with defined pathway (DSCR1→TET1→miR-124), single lab\",\n      \"pmids\": [\"31304631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ERK/c-Jun signaling recruits Tet1 to the EBV Zta promoter; c-Jun interacts with Tet1 (shown by Co-IP) and facilitates Tet1 binding to Zta, leading to promoter demethylation, Zta expression, and EBV reactivation. Tet1 knockdown attenuates TPA-induced Zta demethylation and EBV reactivation.\",\n      \"method\": \"Co-immunoprecipitation of c-Jun and Tet1, ChIP, bisulfite sequencing, siRNA knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ChIP and bisulfite sequencing, functional knockdown, single lab\",\n      \"pmids\": [\"27708396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TET1 recruits co-repressor proteins SIN3A and the histone lysine methyltransferase EZH2 to osteogenic genes in human mesenchymal stem cells, acting as a repressor of both osteogenesis and adipogenesis.\",\n      \"method\": \"siRNA knockdown, Co-IP of TET1 with SIN3A and EZH2, ChIP, differentiation assays\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with functional differentiation assays, single lab\",\n      \"pmids\": [\"30606231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tet1 promotes demethylation of the Dll3 and Notch1 promoters in hippocampal neural stem cells; Tet1 downregulation in FGR causes hypermethylation of these promoters and inhibition of Notch signaling, reducing NSC proliferation. Tet1 overexpression activates Notch signaling and rescues neurogenesis deficits.\",\n      \"method\": \"Tet1 KO/overexpression in FGR mouse model, bisulfite sequencing, Notch signaling assays, neurogenesis quantification\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined pathway (Tet1→Notch via Dll3/Notch1 demethylation) with loss- and gain-of-function, single lab\",\n      \"pmids\": [\"34731622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tet1 loss (but not catalytic inactivation) in ESCs leads to upregulation of p21/Cdkn1a through loss of Tet1-dependent PRC2 (Ezh2) and H3K27me3 enrichment at the p21 promoter, causing delayed G1 cell cycle progression. Tet1 directly occupies the p21 promoter overlapping with H3K27me3.\",\n      \"method\": \"Tet1 KO vs. catalytic-mutant mESCs, ChIP for Ezh2 and H3K27me3 at p21 promoter, p21 knockdown rescue, cell cycle analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic separation of catalytic vs. structural function with ChIP mechanistic evidence, single lab\",\n      \"pmids\": [\"35456045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Tet1 is essential for deposition of 5hmC and facultative histone marks H3K27me3 and H2AK119ub at pericentromeric heterochromatin (PCH), and recruits RING1B (PRC1 component) to PCH. This TET1-dependent mechanism underlies chromocenter clustering in DNA hypomethylated cells via liquid-liquid phase separation.\",\n      \"method\": \"Tet1 KO ESCs, 5hmC ChIP-seq at PCH, H3K27me3 and H2AK119ub ChIP, RING1B co-localization, phase separation assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Tet1 KO with multiple ChIP analyses and phase separation experiments, single lab\",\n      \"pmids\": [\"34166371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Tet1 reduces 5mC levels in an enzymatic activity-dependent manner at the promoters of Sod1 and Sod2 to promote their expression in kidney, thereby reducing injury-induced excessive ROS and acute kidney injury.\",\n      \"method\": \"Tet1 KO mice, bisulfite sequencing of Sod1/Sod2 promoters, ChIP, ROS quantification, I/R and UUO injury models\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with bisulfite sequencing and ChIP at specific target loci, single lab\",\n      \"pmids\": [\"37908721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Morphine and naloxone directly bind to TET1 protein via three key residues (1880-1882) and inhibit its DNA demethylation activity while facilitating neural stem cell proliferation through a receptor-independent, TET1-dependent pathway.\",\n      \"method\": \"Molecular docking, direct binding assay, TET1 demethylation activity assay with opioids, TET1 knockdown, NSC proliferation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding and in vitro enzymatic inhibition with domain identification, single lab\",\n      \"pmids\": [\"32187535\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZFP281 and TET1 co-occupy gene promoters in a manner dependent on R-loop formation at ZFP281-targeted gene promoters; this co-occupancy undergoes bimodal dynamics during naive-formative-primed pluripotency transitions to regulate DNA methylation and gene expression.\",\n      \"method\": \"Zfp281 KO and degron knockin cell models, ChIP-seq co-occupancy analysis, R-loop manipulation\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide co-occupancy with genetic perturbation models, single lab\",\n      \"pmids\": [\"38237590\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TET1 is a 2-oxoglutarate- and Fe(II)-dependent dioxygenase that iteratively oxidizes 5-methylcytosine to 5-hydroxymethylcytosine (and further to 5fC and 5caC), initiating DNA demethylation via TDG-BER; beyond its catalytic role, TET1 functions non-enzymatically by scaffolding repressive complexes (PRC2/Sin3a/HDAC1) at bivalent and developmental gene promoters to regulate H3K27me3 and gene silencing, and is recruited to specific genomic loci through interactions with partners including GADD45A (via R-loops), FOXA1, NONO, PSPC1, c-Jun, FOXA2, SIRT1, and ETV2, placing TET1 as both an epigenetic writer/eraser and a structural chromatin organizer controlling pluripotency, lineage specification, neurogenesis, myelination, metabolism, and immune responses.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TET1 is a 2-oxoglutarate- and Fe(II)-dependent dioxygenase that oxidizes 5-methylcytosine to 5-hydroxymethylcytosine in DNA, initiating active DNA demethylation that shapes pluripotency, lineage specification, and tissue homeostasis [#0, #29]. Its catalytic output feeds the TET1-TDG-base-excision-repair pathway, which sequentially processes symmetrically methylated CpGs to complete demethylation without generating double-strand breaks [#5]. In embryonic stem cells TET1 binds genome-wide at CpG-rich transcription start sites and gene bodies, where it operates complementarily and competitively with the de novo methyltransferase DNMT3A1 to set methylation boundaries and protect DNA methylation canyons [#1, #10, #28]. Beyond catalysis, TET1 acts as a non-enzymatic chromatin scaffold: loss of TET1 — but not loss of its catalytic activity — derepresses bivalent developmental genes by impairing recruitment of PRC2 and the SIN3A/HDAC1 co-repressor machinery and reducing H3K27me3, and this structural function also restrains cell-cycle genes such as p21/Cdkn1a [#11, #12, #35]. TET1 is recruited to defined loci through partners including GADD45A acting at R-loops, NONO, PSPC1, FOXA1, FOXA2, ETV2, and ZFP281, directing demethylation and downstream programs in development and differentiation [#9, #15, #18, #19, #23, #39]. Two isoforms partition these activities: full-length TET1 bearing the CXXC domain is restricted to early embryos, ESCs, and PGCs, whereas the short isoform TET1s lacking CXXC is targeted to late-replicating heterochromatin via CRL4(VprBP)-mediated ubiquitination and UHRF1 recognition, spreading 5mC oxidation and activating LINE1 [#6, #22]. Through these mechanisms TET1 controls Wnt and Notch signaling in stem cell niches, neurogenesis and myelin repair, metabolic and antioxidant gene expression, and is engineerable as a programmable demethylase via TALE and dCas9 fusions [#24, #34, #30, #3, #7]. TET1 expression is itself regulated by oncogenic KRAS/ERK, HIF-1, NF-\\u03baB, and post-transcriptional inputs, positioning it within disease contexts including cancer and leukemia [#14, #25, #26, #27].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established the founding biochemical identity of TET1 by showing it is an enzyme that converts 5mC to 5hmC, defining a new chemical step in DNA modification.\",\n      \"evidence\": \"In vitro enzymatic assay and RNAi depletion with 5hmC quantification in mouse ESCs\",\n      \"pmids\": [\"19372391\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve downstream fate of 5hmC\", \"Genomic targeting and recruitment mechanism unaddressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed TET1 genomic binding is concentrated at CpG-rich promoters and that it physically associates with the SIN3A co-repressor, the first evidence that TET1 functions in transcriptional repression beyond catalysis.\",\n      \"evidence\": \"Genome-wide ChIP-seq and co-immunoprecipitation with SIN3A in ESCs\",\n      \"pmids\": [\"21490601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate catalytic from scaffolding contributions\", \"Mechanism of SIN3A-directed repression undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed TET1 upstream of Nodal/Lefty1 signaling in ESC lineage choice, linking the enzyme to developmental gene regulation.\",\n      \"evidence\": \"RNAi knockdown, embryoid body differentiation, and mouse chimera assays\",\n      \"pmids\": [\"21295276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demethylation target at Lefty1 not yet mapped at this stage\", \"Catalytic vs structural requirement unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated TET1 catalytic activity is sufficient for targeted, locus-specific demethylation and gene activation, validating it as a programmable epigenetic effector.\",\n      \"evidence\": \"TALE-TET1 catalytic-domain fusions with bisulfite sequencing and expression readout in human cells\",\n      \"pmids\": [\"24108092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Off-target demethylation not fully quantified\", \"Endogenous recruitment determinants not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstituted the TET1-TDG-BER pathway biochemically, explaining how iterative oxidation couples to base excision to achieve demethylation without double-strand breaks.\",\n      \"evidence\": \"Biochemical reconstitution, Co-IP, and in vitro enzymatic assays\",\n      \"pmids\": [\"26932196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo coordination of strand asymmetry not directly visualized\", \"Regulation of TDG handoff in chromatin context unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Distinguished isoform-specific function, showing the CXXC-bearing full-length TET1 is developmentally restricted and required for imprint erasure, while a short somatic isoform exists.\",\n      \"evidence\": \"Isoform expression analysis, ChIP-seq, bisulfite sequencing, and mouse knockin genetics\",\n      \"pmids\": [\"27916660\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Targeting mechanism of the short isoform not yet defined here\", \"Functional differences in somatic tissues incompletely mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed TET1 flanking-sequence preferences and demonstrated dCas9-SunTag-TET1 catalytic targeting works in vivo, advancing both substrate understanding and editing utility.\",\n      \"evidence\": \"dCas9-SunTag-scFv-TET1 fusion with bisulfite sequencing in cells and mouse fetuses\",\n      \"pmids\": [\"27571369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Durability of demethylation over divisions not established\", \"Endogenous targeting still distinct from engineered systems\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified R-loops and GADD45A as a recruitment route, explaining how TET1 reaches specific CpG island promoters for demethylation.\",\n      \"evidence\": \"Direct R-loop binding assays, Co-IP, genome-wide TET1 ChIP-seq, and RNase H1 manipulation in ESCs\",\n      \"pmids\": [\"30617255\", \"26546041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality across all TET1 sites not established\", \"How R-loop dynamics are regulated to time recruitment unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the antagonistic and complementary relationship between TET1 and DNMT3A1 that establishes methylation boundaries and co-regulates PRC2-dependent H3K27me3 at bivalent promoters.\",\n      \"evidence\": \"ChIP-seq, whole-genome bisulfite sequencing, and transcriptomics in knockout mouse ESCs\",\n      \"pmids\": [\"30001199\", \"29733394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mutual exclusion at canyons not structurally resolved\", \"Causal order of methylation and H3K27me3 changes incompletely separated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Genetically separated catalytic from non-catalytic TET1 function, establishing that scaffolding of PRC2/SIN3A and maintenance of H3K27me3 at bivalent and cell-cycle genes is demethylase-independent.\",\n      \"evidence\": \"Catalytic-inactive knockin versus knockout ESCs and mice with ChIP-seq, RNA-seq, and bisulfite sequencing\",\n      \"pmids\": [\"35150568\", \"35456045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PRC2/SIN3A bridging undefined\", \"How non-catalytic occupancy is targeted independent of catalysis unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed isoform-selective heterochromatin targeting whereby ubiquitinated TET1s is recognized by UHRF1 to oxidize and decondense heterochromatin and activate LINE1.\",\n      \"evidence\": \"Live-cell imaging, Co-IP, ubiquitination assays, and domain-deletion mutants with 5mC/5hmC profiling\",\n      \"pmids\": [\"36056023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger for TET1s heterochromatin spreading unknown\", \"Consequences of LINE1 activation in vivo not fully traced\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended TET1 recruitment partners to NONO, PSPC1, FOXA2, and FMRP, linking it to neuronal gene control, bivalent promoter maintenance, β-cell differentiation, and m5C RNA demethylation.\",\n      \"evidence\": \"Co-IP with domain mapping, interactome proteomics, triple-KO hESC differentiation, and in vitro m5C demethylation assays\",\n      \"pmids\": [\"32286661\", \"35675764\", \"35798741\", \"35290126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RNA m5C demethylation is a major in vivo TET1 function unresolved\", \"Hierarchy among multiple recruitment partners at shared loci unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Consolidated tissue-level catalytic roles of TET1 across intestinal Wnt signaling, neural Notch signaling, myelin repair, antioxidant defense, and metabolic gene control through locus-specific demethylation.\",\n      \"evidence\": \"Lineage- and tissue-specific conditional knockouts with 5hmC profiling, bisulfite sequencing, and physiological injury or differentiation models\",\n      \"pmids\": [\"27856615\", \"34731622\", \"34099715\", \"37908721\", \"32855402\", \"34738906\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Catalytic versus scaffolding contribution varies by tissue and is not uniformly dissected\", \"Direct target sets incompletely defined in most tissues\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed transcription-factor co-occupancy (ZFP281) at R-loop-dependent promoters dynamically reconfigures TET1 binding across pluripotency states.\",\n      \"evidence\": \"Zfp281 KO and degron models with ChIP-seq co-occupancy and R-loop manipulation\",\n      \"pmids\": [\"38237590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between ZFP281 and TET1 not established\", \"Functional output of redistributed binding on methylation incompletely mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the relative balance of TET1 catalytic versus scaffolding activity is selected at a given locus, and the structural basis by which TET1 bridges PRC2/SIN3A/HDAC1 repressive complexes, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of TET1-PRC2/SIN3A scaffolding\", \"Unified logic governing catalytic vs non-catalytic mode switching is undefined\", \"In vivo significance of RNA m5C demethylation versus DNA demethylation unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 5, 29]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [0, 5, 7]},\n      {\"term_id\": \"GO:0016706\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 22]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [12, 1, 33]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 12]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [1, 22, 36]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [12, 10, 36]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 23, 24, 30]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 11, 33]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 27, 26]}\n    ],\n    \"complexes\": [\n      \"SIN3A co-repressor complex\",\n      \"PRC2\",\n      \"TET1-TDG-BER demethylation complex\"\n    ],\n    \"partners\": [\n      \"TDG\",\n      \"SIN3A\",\n      \"GADD45A\",\n      \"DNMT3A\",\n      \"NONO\",\n      \"PSPC1\",\n      \"FOXA1\",\n      \"EZH2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}