{"gene":"MTA2","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2002,"finding":"MBD3's methyl-CpG-binding domain (MBD) is necessary and sufficient for binding to HDAC1 and MTA2, two components of the NuRD/Mi2 complex, establishing MTA2 as an MBD3-interacting partner within the NuRD complex.","method":"Recombinant protein binding assays with wild-type and mutant MBD3 proteins","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated with recombinant proteins and mutagenesis, single lab","pmids":["12124384"],"is_preprint":false},{"year":1999,"finding":"MTA2 (originally cloned as MTA1-L1) encodes a 668 amino acid protein with 59.6% identity to MTA1, is ubiquitously expressed as a 3.0-kb transcript, and maps to chromosomal band 11q12-13.1.","method":"cDNA cloning, Northern blot, FISH","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular characterization of the gene, single lab, multiple methods","pmids":["9929979"],"is_preprint":false},{"year":2008,"finding":"Mta2 knockout in mice causes lupus-like autoimmune disease with T cell hyperproliferation and hyperinduction of IL-2, IL-4, and IFN-γ; IL-4 was identified as a direct transcriptional target of Mta2/NuRD, establishing MTA2 as a repressor of cytokine gene expression in T cells.","method":"Knockout mouse model, bone marrow transplantation, T cell-specific knockout, gene expression analysis, chromatin immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — whole-body and T cell-specific KO mice with defined phenotypes and direct target gene identification","pmids":["18353770"],"is_preprint":false},{"year":2010,"finding":"RNAi-mediated knockdown of MTA2 in mouse preimplantation embryos leads to biallelic expression of the normally maternally-expressed H19 gene and loss of DNA methylation at the H19 differentially methylated region, and biallelic expression of the paternally-expressed Peg3 gene, demonstrating MTA2 is required within the NuRD complex for maintaining genomic imprinting.","method":"RNAi knockdown in mouse embryos, allele-specific expression analysis, bisulfite sequencing","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional knockdown in embryos with specific molecular readouts (allele-specific expression and DNA methylation)","pmids":["20720167"],"is_preprint":false},{"year":2012,"finding":"MTA2 is exclusively expressed in Sertoli cells (SCs) and acts as a corepressor of FSHR transcription by recruiting HDAC1 to the FSHR promoter, participating in FSH-induced desensitization; the FSH/androgen receptor/MTA2 cascade constitutes a negative feedback loop modulating FSH signaling.","method":"siRNA knockdown, ChIP assay, deacetylase activity assay, gene expression analysis in Sertoli cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ChIP, siRNA knockdown, enzymatic assay) in a single rigorous study establishing mechanistic pathway","pmids":["23086931"],"is_preprint":false},{"year":2013,"finding":"Transcription factor Sp1 binds to the MTA2 gene promoter at the region -1043 bp to -843 bp and enhances MTA2 transcriptional activity, establishing Sp1 as a transcriptional activator of MTA2.","method":"Chromatin immunoprecipitation, luciferase reporter assay, Sp1 overexpression","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assays in single lab","pmids":["24010737"],"is_preprint":false},{"year":2014,"finding":"MTA2 is acetylated at lysine 152 by the histone acetyltransferase p300; mutation of the K152 acetylation site inhibits colorectal cancer cell growth and migration/invasion of Rat1 fibroblasts.","method":"Co-immunoprecipitation, site-directed mutagenesis, cell proliferation and migration assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct identification of PTM site and writer enzyme with functional mutagenesis, single lab","pmids":["24468085"],"is_preprint":false},{"year":2014,"finding":"Mta2 is a novel Tipin binding partner; Mta2 is required for Tipin-dependent Polymerase α binding to replicating chromatin and prevents accumulation of reversed replication forks; Tipin is directly required for efficient replication of vertebrate centromeric DNA.","method":"Xenopus laevis egg extract replication assay, co-immunoprecipitation, specific genomic locus replication assay","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in Xenopus egg extract with biochemical fractionation, novel assay for locus-specific replication, multiple orthogonal methods","pmids":["24830473"],"is_preprint":false},{"year":2017,"finding":"Human MTA2 forms a stable complex with RBBP7; purified MTA2-RBBP7 complex shows an elongated architecture with hinge-like motion by negative-stain EM, consistent with a 2:4 stoichiometry analogous to the MTA1-RBBP4 complex, and represents an initial assembly module of the NuRD complex.","method":"Protein expression/purification from HEK293F cells, negative-stain electron microscopy, 3D volume reconstruction","journal":"Biochimica et biophysica acta. Proteins and proteomics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct structural characterization of purified human complex, single lab","pmids":["28179136"],"is_preprint":false},{"year":2018,"finding":"MTA2 is transcriptionally upregulated by HIF-1α through a hypoxia response element (HRE) in the MTA2 promoter; reciprocally, MTA2 deacetylates HIF-1α and enhances its stability via interaction with HDAC1; HIF-1α then recruits MTA2 and HDAC1 to the E-cadherin promoter to repress its transcription in pancreatic carcinoma.","method":"ChIP assay, co-immunoprecipitation, luciferase reporter assay, overexpression and knockdown in vitro and in xenograft models","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, Co-IP, reporter assay) establishing reciprocal regulatory loop, single lab","pmids":["29708271"],"is_preprint":false},{"year":2019,"finding":"MTA2/NuRD directly interacts with AIOLOS/IKAROS in B cells and shows overlapping target genes; MTA2 deficiency leads to increased H3K27 acetylation at Igll1 and VpreB1 promoters, indicating MTA2/NuRD represses these genes via histone deacetylation during B cell development; MTA2 and OCA-B synergistically repress Igll1 and VpreB1 at the pre-B cell stage.","method":"Co-immunoprecipitation, knockout mouse model, ChIP-seq, H3K27 acetylation analysis, B cell developmental phenotyping","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mice with mechanistic ChIP-seq, Co-IP with AIOLOS/IKAROS, and histone modification analysis; multiple orthogonal approaches","pmids":["31291582"],"is_preprint":false},{"year":2019,"finding":"MTA2 represses PTEN transcription by binding to the PTEN promoter, with Snail recruiting MTA2 and HDAC1 to suppress PTEN expression, thereby activating PI3K/AKT signaling in pancreatic ductal adenocarcinoma.","method":"ChIP-seq, quantitative ChIP, luciferase reporter assay, overexpression/knockdown in vitro and xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq and functional luciferase reporter assays, single lab","pmids":["30814496"],"is_preprint":false},{"year":2019,"finding":"MTA1 overexpression promotes MTA2 protein degradation through neutrophil elastase (NE)-mediated proteolytic cleavage at specific C-terminal sites (486, 497, 542, 583, and 621), activated by MTA1-mediated epigenetic repression of the NE inhibitor elafin, establishing a cross-regulatory mechanism between MTA1 and MTA2.","method":"Immunoblotting, qRT-PCR, NE inhibitor/knockdown/overexpression, MTA2 truncation and mutation analysis, immunocytochemistry","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis identifying specific cleavage sites, single lab","pmids":["30642362"],"is_preprint":false},{"year":2020,"finding":"MTA2 transcriptionally suppresses miR-7 expression, leading to increased Sp1 levels, which in turn drives KLK10 transcription to promote cervical cancer cell migration and invasion.","method":"shRNA knockdown, gene expression analysis, luciferase reporter assay, ChIP, in vitro and in vivo functional assays","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods establishing pathway order, single lab","pmids":["32402941"],"is_preprint":false},{"year":2020,"finding":"MTA2 interacts with SerRS (seryl tRNA synthetase) and regulates SerRS transcription; an isoflavone derivative MEQ binds MTA2 to upregulate SerRS and thereby downregulate VEGFA, suppressing angiogenesis in triple-negative breast cancer.","method":"Proteomics, biochemical studies, dual-luciferase reporter system, in vivo angiogenesis assays, xenograft models","journal":"Cancer biology & medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — interaction identified by proteomics with limited mechanistic follow-up on the MTA2-SerRS interaction itself, single lab","pmids":["32944400"],"is_preprint":false},{"year":2021,"finding":"MTA2 silencing reduces MMP12 expression in cervical cancer cells via the ASK1/MEK3/p38/YB1 signaling axis; p38-mediated YB1 phosphorylation disrupts AP1 (c-Fos/c-Jun) binding to the MMP12 promoter, thereby inhibiting MMP12 expression and metastasis.","method":"shRNA knockdown, ChIP assay, Western blotting, in vitro and in vivo invasion assays, xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay and signaling pathway dissection with multiple nodes, single lab","pmids":["33958583"],"is_preprint":false},{"year":2021,"finding":"MTA2 interacts with EIF4E (eukaryotic initiation factor 4E), which positively regulates Twist expression; Twist then recruits MTA2 to the E-cadherin promoter to reduce histone acetylation and suppress E-cadherin expression, promoting EMT in esophageal squamous cell carcinoma.","method":"Co-immunoprecipitation, expression microarray, ChIP assay, in vitro and in vivo functional assays","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP establishing complex and chromatin interaction, single lab","pmids":["33340431"],"is_preprint":false},{"year":2021,"finding":"MTA2 preferentially binds replication origin-associated DNA sequences (by CUT&TAG assay), and MTA2 expression confers sensitivity to PARP inhibitor olaparib by aggravating olaparib-induced replication stress in gastric cancer cells.","method":"CUT&TAG assay, proteomic profiling, PARP inhibitor sensitivity assays, ATR inhibitor combination studies","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromatin binding assay with functional consequence, single lab","pmids":["34280886"],"is_preprint":false},{"year":2021,"finding":"AIB1 interacts with MTA2 to form a repressive complex that inhibits CDH1 (E-cadherin) transcription, promoting EMT in ER+ breast cancer metastasis.","method":"Interactome analysis (complementary RNAseq), CDX and PDX ex-vivo models, functional cancer assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interactome and transcriptomic analysis with functional models, single lab","pmids":["33420368"],"is_preprint":false},{"year":2021,"finding":"lncRNA LINC00941 interacts with NuRD-associated MTA2 and CHD4 in human primary keratinocytes; LINC00941 perturbation changes MTA2/NuRD occupancy at bivalent chromatin domains near the EGR3 gene locus, leading to increased EGR3 expression and premature epidermal differentiation.","method":"RNA immunoprecipitation, ChIP, gene expression analysis, keratinocyte differentiation assays","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP and ChIP establishing lncRNA-MTA2 interaction and chromatin occupancy, with functional differentiation readout; single lab","pmids":["38649186"],"is_preprint":false},{"year":2024,"finding":"MTA2 co-occupies DNA with HNF4A on colonic chromatin; MTA2 loss leads to HNF4A release from colonic chromatin and its accumulation on small intestinal chromatin, activating lipid absorptive genes and converting colonic identity toward small intestinal identity, establishing MTA2 as part of a SATB2-MTA2 complex that restrains colonic plasticity by retaining HNF4A at colonic chromatin.","method":"Proteomics, CRISPR-Cas9 screening, ChIP-seq, chromatin co-occupancy analysis, functional lipid uptake assays, mouse colon-specific knockout","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen, ChIP-seq, proteomic identification, and functional in vivo assays with mechanistic chromatin readout in single rigorous study","pmids":["38678016"],"is_preprint":false},{"year":2025,"finding":"HMGB2 directly interacts with MTA2 and inhibits its ubiquitination-mediated degradation, thereby stabilizing HIF-1α protein and promoting glycolysis-dependent cardiomyocyte proliferation and heart regeneration.","method":"Immunoprecipitation-mass spectrometry (IP-MS), RNA-seq, single-nucleus RNA-seq, cardiomyocyte-specific overexpression and knockdown in mice, myocardial infarction model","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS identifying interaction plus in vivo cardiac functional assays, single lab","pmids":["41092376"],"is_preprint":false},{"year":2024,"finding":"MTA2 is a direct target of miR-34a in endothelial cells; endothelial miR-34a deletion de-represses MTA2 to promote Ang II-induced EC proliferation and protect against abdominal aortic aneurysm formation.","method":"miR-34a endothelial-specific knockout mice, Ang II AAA model, luciferase reporter (implied direct targeting), functional EC proliferation assays","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, direct miR-34a–MTA2 targeting validated by reporter assay but mechanistic detail on MTA2 function downstream is limited","pmids":[],"is_preprint":true},{"year":2016,"finding":"lncRNA SNHG5 interacts with MTA2 protein and prevents its translocation from the cytoplasm into the nucleus, leading to increased acetylation of histone H3 and p53 and interfering with NuRD complex formation.","method":"RNA pulldown, Co-immunoprecipitation, subcellular fractionation, histone acetylation assays, overexpression in gastric cancer cells","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RNA pulldown without stringent controls; mechanism is cytoplasmic sequestration rather than direct enzymatic characterization","pmids":["27065326"],"is_preprint":false},{"year":2019,"finding":"MTA2 promotes HCC proliferation and metastasis through transcriptional repression of FRMD6 (a key upstream component of the Hippo signaling pathway), identified by genome-wide ChIP-seq.","method":"ChIP-seq, knockdown/overexpression in vitro and in vivo xenograft models","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq identifying direct binding to FRMD6 with functional consequence, single lab","pmids":["31128910"],"is_preprint":false},{"year":2023,"finding":"MTA2 directly binds the promoter of MCM5 (minichromosome maintenance deficient 5) to promote its expression, thereby facilitating gastric cancer growth and metastasis.","method":"ChIP assay, in vitro and in vivo overexpression/knockdown functional assays","journal":"Journal of Cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single ChIP assay with limited mechanistic follow-up","pmids":["36741260"],"is_preprint":false},{"year":2023,"finding":"MTA2 knockdown in HCC cells downregulates PTK7 expression, and PTK7 regulates MMP7 expression and cell migration/invasion through FAK signaling, establishing an MTA2-PTK7-FAK-MMP7 axis in HCC metastasis.","method":"siRNA knockdown, FAK inhibitor, recombinant human MMP7 rescue assay, migration/invasion assays","journal":"Environmental toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, no direct ChIP or binding assay showing MTA2 directly regulates PTK7 transcription; indirect pathway inference","pmids":["38050825"],"is_preprint":false},{"year":2024,"finding":"MTA2 knockdown reduces uPA (urokinase-type plasminogen activator) expression in osteosarcoma cells via ERK1/2 signaling, inhibiting cell migration and invasion; recombinant uPA rescues migration in MTA2-knockdown cells.","method":"shRNA knockdown, recombinant human uPA rescue assay, ERK depletion, in vivo metastasis model","journal":"Aging","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, pathway inferred from knockdown without direct binding/ChIP evidence linking MTA2 to uPA promoter","pmids":["39248711"],"is_preprint":false}],"current_model":"MTA2 is a core subunit of the NuRD (nucleosome remodeling and histone deacetylase) complex that recruits HDAC1 to target gene promoters to repress transcription via histone deacetylation; it forms a stable 2:4 complex with RBBP7 as part of initial NuRD assembly, interacts with MBD3, AIOLOS/IKAROS, and other complex partners, and regulates diverse biological processes including T cell cytokine gene repression (IL-4, IFN-γ), genomic imprinting maintenance (H19, Peg3) in preimplantation embryos, FSHR transcriptional desensitization in Sertoli cells, colonic cell identity through HNF4A chromatin retention, and B cell development; post-translationally, MTA2 is acetylated at K152 by p300 and can be degraded by neutrophil elastase at specific C-terminal sites, and its stability is regulated by ubiquitination; at replication forks, MTA2 interacts with Tipin to facilitate Polymerase α loading and prevent reversed fork accumulation at difficult-to-replicate genomic regions."},"narrative":{"mechanistic_narrative":"MTA2 is a core subunit of the NuRD (nucleosome remodeling and histone deacetylase) complex that represses transcription by recruiting HDAC1 to target promoters to deacetylate histones [PMID:18353770, PMID:23086931]. Within NuRD it interacts with MBD3 [PMID:12124384] and forms a stable elongated MTA2-RBBP7 module of 2:4 stoichiometry that represents an initial assembly intermediate of the complex [PMID:28179136]. Through this repressive activity MTA2 controls diverse developmental and immune programs: it silences cytokine genes such as IL-4 in T cells, with its loss causing lupus-like autoimmunity [PMID:18353770]; it maintains genomic imprinting of H19 and Peg3 in preimplantation embryos [PMID:20720167]; it acts as a corepressor of FSHR transcription in Sertoli cells [PMID:23086931]; it represses Igll1 and VpreB1 via histone deacetylation during B cell development in association with AIOLOS/IKAROS [PMID:31291582]; and it restrains colonic cell identity by retaining HNF4A on colonic chromatin as part of a SATB2-MTA2 complex [PMID:38678016]. In cancer, MTA2 is frequently co-opted to repress tumor-suppressor and epithelial genes such as E-cadherin and PTEN through partnerships with Snail, Twist, AIB1 and HIF-1α, driving EMT and metastasis [PMID:29708271, PMID:30814496, PMID:33340431, PMID:33420368]. Beyond chromatin, MTA2 has a replication-associated role: it binds Tipin to support Polymerase α loading onto replicating chromatin and to prevent accumulation of reversed forks at difficult-to-replicate regions [PMID:24830473]. MTA2 activity is itself tuned by post-translational regulation, including acetylation at K152 by p300 [PMID:24468085] and proteolytic and ubiquitination-controlled turnover [PMID:30642362].","teleology":[{"year":1999,"claim":"Establishing the gene's existence and relationship to MTA1 was the first step, defining MTA2 as a distinct, broadly expressed family member.","evidence":"cDNA cloning, Northern blot and FISH mapping (as MTA1-L1)","pmids":["9929979"],"confidence":"Medium","gaps":["No function assigned at cloning","Domain architecture not resolved"]},{"year":2002,"claim":"Placing MTA2 in a defined complex answered how it physically connects to chromatin machinery, identifying it as an MBD3-interacting NuRD subunit alongside HDAC1.","evidence":"Recombinant protein binding assays with wild-type/mutant MBD3","pmids":["12124384"],"confidence":"Medium","gaps":["Stoichiometry and assembly order not defined","No genomic targets identified yet"]},{"year":2008,"claim":"Loss-of-function in mice tested the in vivo role of MTA2-NuRD, establishing it as a transcriptional repressor of cytokine genes whose loss causes autoimmunity.","evidence":"Whole-body and T cell-specific knockout mice with ChIP-based IL-4 target identification","pmids":["18353770"],"confidence":"High","gaps":["Direct vs indirect targets beyond IL-4 not fully resolved","Mechanism of T cell hyperproliferation not detailed"]},{"year":2010,"claim":"Embryo knockdown addressed whether MTA2 maintains epigenetic marks, showing it is required for genomic imprinting at H19 and Peg3.","evidence":"RNAi in mouse preimplantation embryos, allele-specific expression and bisulfite sequencing","pmids":["20720167"],"confidence":"High","gaps":["How NuRD links to DNA methylation maintenance not defined","Other imprinted loci not surveyed"]},{"year":2012,"claim":"The Sertoli cell study dissected a specific corepressor pathway, showing MTA2 recruits HDAC1 to the FSHR promoter within a negative-feedback loop.","evidence":"siRNA knockdown, ChIP, and deacetylase activity assays in Sertoli cells","pmids":["23086931"],"confidence":"High","gaps":["Generalizability beyond Sertoli cells unknown","Composition of MTA2 complex at FSHR not fully defined"]},{"year":2014,"claim":"Identification of K152 acetylation by p300 revealed how MTA2 activity is post-translationally tuned and linked to cancer cell behavior.","evidence":"Co-IP, site-directed mutagenesis, proliferation and migration assays","pmids":["24468085"],"confidence":"Medium","gaps":["Deacetylase for K152 not identified","Mechanistic consequence on NuRD assembly unclear"]},{"year":2014,"claim":"The Tipin interaction uncovered a chromatin-replication role distinct from transcriptional repression, placing MTA2 at replication forks supporting Polymerase α loading.","evidence":"Xenopus egg extract replication reconstitution, Co-IP, locus-specific replication assay","pmids":["24830473"],"confidence":"High","gaps":["Whether NuRD complex or MTA2 alone acts at forks unresolved","Human in vivo confirmation pending"]},{"year":2017,"claim":"Structural characterization defined the architecture of the initial NuRD assembly module, showing MTA2-RBBP7 forms an elongated 2:4 complex.","evidence":"Purification from HEK293F and negative-stain EM with 3D reconstruction","pmids":["28179136"],"confidence":"Medium","gaps":["High-resolution structure not obtained","How further subunits dock not shown"]},{"year":2019,"claim":"Multiple studies clarified context-specific partners and targets: AIOLOS/IKAROS in B cell development and Snail-directed PTEN repression in cancer.","evidence":"Knockout mice, ChIP-seq, H3K27ac analysis, Co-IP, luciferase assays","pmids":["31291582","30814496"],"confidence":"High","gaps":["How distinct recruiters select target genes not unified","Direct vs cofactor-driven repression not always separated"]},{"year":2019,"claim":"Cross-regulation between paralogs was defined, with MTA1 driving neutrophil elastase-mediated cleavage of MTA2 at specific C-terminal sites.","evidence":"Immunoblotting, truncation/mutation analysis, NE inhibitor/knockdown","pmids":["30642362"],"confidence":"Medium","gaps":["Physiological contexts of NE cleavage limited","Functional output of cleaved fragments unclear"]},{"year":2021,"claim":"A series of cancer studies established MTA2 as an EMT/metastasis driver recruited by Twist, AIB1 and others to repress E-cadherin, and as a regulator of replication-stress sensitivity.","evidence":"Co-IP, ChIP, CUT&TAG origin-binding, PARP inhibitor sensitivity, xenografts","pmids":["33340431","33420368","34280886"],"confidence":"Medium","gaps":["Tissue-specific versus general EMT mechanism unresolved","Link between origin binding and transcriptional roles unclear"]},{"year":2024,"claim":"The colonic identity study provided a high-resolution developmental mechanism, defining a SATB2-MTA2 complex that retains HNF4A on colonic chromatin to restrain plasticity.","evidence":"Proteomics, CRISPR screen, ChIP-seq co-occupancy, colon-specific knockout mice","pmids":["38678016"],"confidence":"High","gaps":["How MTA2 anchors HNF4A mechanistically not fully resolved","Reversibility of identity switch not defined"]},{"year":2025,"claim":"Stability regulation was extended, showing HMGB2 stabilizes MTA2 against ubiquitination to support HIF-1α-driven cardiomyocyte proliferation.","evidence":"IP-MS, RNA-seq, cardiomyocyte-specific manipulation in MI model","pmids":["41092376"],"confidence":"Medium","gaps":["E3 ligase for MTA2 not identified","Direct vs indirect HIF-1α stabilization not separated"]},{"year":null,"claim":"How MTA2's distinct activities — NuRD-dependent transcriptional repression, replication-fork support, and context-specific recruiter partnerships — are coordinated within a single cell and selectively engaged across tissues remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model linking chromatin and replication roles","Determinants of target-gene selection across partners unknown","E3 ligase and full PTM code governing MTA2 turnover undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,4,10,20]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[17,20,24]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,8,10,20]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[2,10,20]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,11,20]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[7,17]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,10]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,20]}],"complexes":["NuRD complex","MTA2-RBBP7 assembly module","SATB2-MTA2 complex"],"partners":["HDAC1","MBD3","RBBP7","TIPIN","IKZF3","HNF4A","HIF-1A","CHD4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O94776","full_name":"Metastasis-associated protein MTA2","aliases":["Metastasis-associated 1-like 1","MTA1-L1 protein","p53 target protein in deacetylase complex"],"length_aa":668,"mass_kda":75.0,"function":"May function as a transcriptional coregulator (PubMed:16428440, PubMed:28977666). Acts as a component of the histone deacetylase NuRD complex which participates in the remodeling of chromatin (PubMed:16428440, PubMed:28977666)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O94776/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MTA2","classification":"Not Classified","n_dependent_lines":126,"n_total_lines":1208,"dependency_fraction":0.10430463576158941},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HDAC1","stoichiometry":10.0},{"gene":"HDAC2","stoichiometry":10.0},{"gene":"RBBP4","stoichiometry":4.0},{"gene":"ATG13","stoichiometry":0.2},{"gene":"CSNK2B","stoichiometry":0.2},{"gene":"EMC8","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MTA2","total_profiled":1310},"omim":[{"mim_id":"620799","title":"LONG INTERGENIC NONCODING RNA 941; LINC00941","url":"https://www.omim.org/entry/620799"},{"mim_id":"617611","title":"PICALM-INTERACTING MITOTIC REGULATOR; PIMREG","url":"https://www.omim.org/entry/617611"},{"mim_id":"615786","title":"NACC FAMILY, MEMBER 2, BEN AND BTB/POZ DOMAINS-CONTAINING; NACC2","url":"https://www.omim.org/entry/615786"},{"mim_id":"606558","title":"BAF CHROMATIN REMODELING COMPLEX SUBUNIT BCL11B; BCL11B","url":"https://www.omim.org/entry/606558"},{"mim_id":"603947","title":"METASTASIS-ASSOCIATED PROTEIN 2; MTA2","url":"https://www.omim.org/entry/603947"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MTA2"},"hgnc":{"alias_symbol":["MTA1-L1"],"prev_symbol":["MTA1L1"]},"alphafold":{"accession":"O94776","domains":[{"cath_id":"2.30.30.490","chopping":"1-141","consensus_level":"high","plddt":91.5047,"start":1,"end":141},{"cath_id":"4.10.1240.50","chopping":"186-262","consensus_level":"medium","plddt":91.1074,"start":186,"end":262},{"cath_id":"1.10.10.60","chopping":"266-328","consensus_level":"medium","plddt":94.2402,"start":266,"end":328},{"cath_id":"3.30.50","chopping":"366-405","consensus_level":"medium","plddt":89.268,"start":366,"end":405},{"cath_id":"-","chopping":"460-502","consensus_level":"high","plddt":88.36,"start":460,"end":502}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O94776","model_url":"https://alphafold.ebi.ac.uk/files/AF-O94776-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O94776-F1-predicted_aligned_error_v6.png","plddt_mean":75.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MTA2","jax_strain_url":"https://www.jax.org/strain/search?query=MTA2"},"sequence":{"accession":"O94776","fasta_url":"https://rest.uniprot.org/uniprotkb/O94776.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O94776/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O94776"}},"corpus_meta":[{"pmid":"12124384","id":"PMC_12124384","title":"The 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Medical sciences = Hua zhong ke ji da xue xue bao. Yi xue Ying De wen ban = Huazhong keji daxue xuebao. 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IL-4 was identified as a direct transcriptional target of Mta2/NuRD, establishing MTA2 as a repressor of cytokine gene expression in T cells.\",\n      \"method\": \"Knockout mouse model, bone marrow transplantation, T cell-specific knockout, gene expression analysis, chromatin immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — whole-body and T cell-specific KO mice with defined phenotypes and direct target gene identification\",\n      \"pmids\": [\"18353770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RNAi-mediated knockdown of MTA2 in mouse preimplantation embryos leads to biallelic expression of the normally maternally-expressed H19 gene and loss of DNA methylation at the H19 differentially methylated region, and biallelic expression of the paternally-expressed Peg3 gene, demonstrating MTA2 is required within the NuRD complex for maintaining genomic imprinting.\",\n      \"method\": \"RNAi knockdown in mouse embryos, allele-specific expression analysis, bisulfite sequencing\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional knockdown in embryos with specific molecular readouts (allele-specific expression and DNA methylation)\",\n      \"pmids\": [\"20720167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MTA2 is exclusively expressed in Sertoli cells (SCs) and acts as a corepressor of FSHR transcription by recruiting HDAC1 to the FSHR promoter, participating in FSH-induced desensitization; the FSH/androgen receptor/MTA2 cascade constitutes a negative feedback loop modulating FSH signaling.\",\n      \"method\": \"siRNA knockdown, ChIP assay, deacetylase activity assay, gene expression analysis in Sertoli cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ChIP, siRNA knockdown, enzymatic assay) in a single rigorous study establishing mechanistic pathway\",\n      \"pmids\": [\"23086931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Transcription factor Sp1 binds to the MTA2 gene promoter at the region -1043 bp to -843 bp and enhances MTA2 transcriptional activity, establishing Sp1 as a transcriptional activator of MTA2.\",\n      \"method\": \"Chromatin immunoprecipitation, luciferase reporter assay, Sp1 overexpression\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assays in single lab\",\n      \"pmids\": [\"24010737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MTA2 is acetylated at lysine 152 by the histone acetyltransferase p300; mutation of the K152 acetylation site inhibits colorectal cancer cell growth and migration/invasion of Rat1 fibroblasts.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis, cell proliferation and migration assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct identification of PTM site and writer enzyme with functional mutagenesis, single lab\",\n      \"pmids\": [\"24468085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Mta2 is a novel Tipin binding partner; Mta2 is required for Tipin-dependent Polymerase α binding to replicating chromatin and prevents accumulation of reversed replication forks; Tipin is directly required for efficient replication of vertebrate centromeric DNA.\",\n      \"method\": \"Xenopus laevis egg extract replication assay, co-immunoprecipitation, specific genomic locus replication assay\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in Xenopus egg extract with biochemical fractionation, novel assay for locus-specific replication, multiple orthogonal methods\",\n      \"pmids\": [\"24830473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human MTA2 forms a stable complex with RBBP7; purified MTA2-RBBP7 complex shows an elongated architecture with hinge-like motion by negative-stain EM, consistent with a 2:4 stoichiometry analogous to the MTA1-RBBP4 complex, and represents an initial assembly module of the NuRD complex.\",\n      \"method\": \"Protein expression/purification from HEK293F cells, negative-stain electron microscopy, 3D volume reconstruction\",\n      \"journal\": \"Biochimica et biophysica acta. Proteins and proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct structural characterization of purified human complex, single lab\",\n      \"pmids\": [\"28179136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MTA2 is transcriptionally upregulated by HIF-1α through a hypoxia response element (HRE) in the MTA2 promoter; reciprocally, MTA2 deacetylates HIF-1α and enhances its stability via interaction with HDAC1; HIF-1α then recruits MTA2 and HDAC1 to the E-cadherin promoter to repress its transcription in pancreatic carcinoma.\",\n      \"method\": \"ChIP assay, co-immunoprecipitation, luciferase reporter assay, overexpression and knockdown in vitro and in xenograft models\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, Co-IP, reporter assay) establishing reciprocal regulatory loop, single lab\",\n      \"pmids\": [\"29708271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA2/NuRD directly interacts with AIOLOS/IKAROS in B cells and shows overlapping target genes; MTA2 deficiency leads to increased H3K27 acetylation at Igll1 and VpreB1 promoters, indicating MTA2/NuRD represses these genes via histone deacetylation during B cell development; MTA2 and OCA-B synergistically repress Igll1 and VpreB1 at the pre-B cell stage.\",\n      \"method\": \"Co-immunoprecipitation, knockout mouse model, ChIP-seq, H3K27 acetylation analysis, B cell developmental phenotyping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mice with mechanistic ChIP-seq, Co-IP with AIOLOS/IKAROS, and histone modification analysis; multiple orthogonal approaches\",\n      \"pmids\": [\"31291582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA2 represses PTEN transcription by binding to the PTEN promoter, with Snail recruiting MTA2 and HDAC1 to suppress PTEN expression, thereby activating PI3K/AKT signaling in pancreatic ductal adenocarcinoma.\",\n      \"method\": \"ChIP-seq, quantitative ChIP, luciferase reporter assay, overexpression/knockdown in vitro and xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq and functional luciferase reporter assays, single lab\",\n      \"pmids\": [\"30814496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA1 overexpression promotes MTA2 protein degradation through neutrophil elastase (NE)-mediated proteolytic cleavage at specific C-terminal sites (486, 497, 542, 583, and 621), activated by MTA1-mediated epigenetic repression of the NE inhibitor elafin, establishing a cross-regulatory mechanism between MTA1 and MTA2.\",\n      \"method\": \"Immunoblotting, qRT-PCR, NE inhibitor/knockdown/overexpression, MTA2 truncation and mutation analysis, immunocytochemistry\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods including mutagenesis identifying specific cleavage sites, single lab\",\n      \"pmids\": [\"30642362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MTA2 transcriptionally suppresses miR-7 expression, leading to increased Sp1 levels, which in turn drives KLK10 transcription to promote cervical cancer cell migration and invasion.\",\n      \"method\": \"shRNA knockdown, gene expression analysis, luciferase reporter assay, ChIP, in vitro and in vivo functional assays\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods establishing pathway order, single lab\",\n      \"pmids\": [\"32402941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MTA2 interacts with SerRS (seryl tRNA synthetase) and regulates SerRS transcription; an isoflavone derivative MEQ binds MTA2 to upregulate SerRS and thereby downregulate VEGFA, suppressing angiogenesis in triple-negative breast cancer.\",\n      \"method\": \"Proteomics, biochemical studies, dual-luciferase reporter system, in vivo angiogenesis assays, xenograft models\",\n      \"journal\": \"Cancer biology & medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — interaction identified by proteomics with limited mechanistic follow-up on the MTA2-SerRS interaction itself, single lab\",\n      \"pmids\": [\"32944400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTA2 silencing reduces MMP12 expression in cervical cancer cells via the ASK1/MEK3/p38/YB1 signaling axis; p38-mediated YB1 phosphorylation disrupts AP1 (c-Fos/c-Jun) binding to the MMP12 promoter, thereby inhibiting MMP12 expression and metastasis.\",\n      \"method\": \"shRNA knockdown, ChIP assay, Western blotting, in vitro and in vivo invasion assays, xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay and signaling pathway dissection with multiple nodes, single lab\",\n      \"pmids\": [\"33958583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTA2 interacts with EIF4E (eukaryotic initiation factor 4E), which positively regulates Twist expression; Twist then recruits MTA2 to the E-cadherin promoter to reduce histone acetylation and suppress E-cadherin expression, promoting EMT in esophageal squamous cell carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, expression microarray, ChIP assay, in vitro and in vivo functional assays\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP establishing complex and chromatin interaction, single lab\",\n      \"pmids\": [\"33340431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTA2 preferentially binds replication origin-associated DNA sequences (by CUT&TAG assay), and MTA2 expression confers sensitivity to PARP inhibitor olaparib by aggravating olaparib-induced replication stress in gastric cancer cells.\",\n      \"method\": \"CUT&TAG assay, proteomic profiling, PARP inhibitor sensitivity assays, ATR inhibitor combination studies\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromatin binding assay with functional consequence, single lab\",\n      \"pmids\": [\"34280886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AIB1 interacts with MTA2 to form a repressive complex that inhibits CDH1 (E-cadherin) transcription, promoting EMT in ER+ breast cancer metastasis.\",\n      \"method\": \"Interactome analysis (complementary RNAseq), CDX and PDX ex-vivo models, functional cancer assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interactome and transcriptomic analysis with functional models, single lab\",\n      \"pmids\": [\"33420368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"lncRNA LINC00941 interacts with NuRD-associated MTA2 and CHD4 in human primary keratinocytes; LINC00941 perturbation changes MTA2/NuRD occupancy at bivalent chromatin domains near the EGR3 gene locus, leading to increased EGR3 expression and premature epidermal differentiation.\",\n      \"method\": \"RNA immunoprecipitation, ChIP, gene expression analysis, keratinocyte differentiation assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP and ChIP establishing lncRNA-MTA2 interaction and chromatin occupancy, with functional differentiation readout; single lab\",\n      \"pmids\": [\"38649186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MTA2 co-occupies DNA with HNF4A on colonic chromatin; MTA2 loss leads to HNF4A release from colonic chromatin and its accumulation on small intestinal chromatin, activating lipid absorptive genes and converting colonic identity toward small intestinal identity, establishing MTA2 as part of a SATB2-MTA2 complex that restrains colonic plasticity by retaining HNF4A at colonic chromatin.\",\n      \"method\": \"Proteomics, CRISPR-Cas9 screening, ChIP-seq, chromatin co-occupancy analysis, functional lipid uptake assays, mouse colon-specific knockout\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen, ChIP-seq, proteomic identification, and functional in vivo assays with mechanistic chromatin readout in single rigorous study\",\n      \"pmids\": [\"38678016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HMGB2 directly interacts with MTA2 and inhibits its ubiquitination-mediated degradation, thereby stabilizing HIF-1α protein and promoting glycolysis-dependent cardiomyocyte proliferation and heart regeneration.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (IP-MS), RNA-seq, single-nucleus RNA-seq, cardiomyocyte-specific overexpression and knockdown in mice, myocardial infarction model\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS identifying interaction plus in vivo cardiac functional assays, single lab\",\n      \"pmids\": [\"41092376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MTA2 is a direct target of miR-34a in endothelial cells; endothelial miR-34a deletion de-represses MTA2 to promote Ang II-induced EC proliferation and protect against abdominal aortic aneurysm formation.\",\n      \"method\": \"miR-34a endothelial-specific knockout mice, Ang II AAA model, luciferase reporter (implied direct targeting), functional EC proliferation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, direct miR-34a–MTA2 targeting validated by reporter assay but mechanistic detail on MTA2 function downstream is limited\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"lncRNA SNHG5 interacts with MTA2 protein and prevents its translocation from the cytoplasm into the nucleus, leading to increased acetylation of histone H3 and p53 and interfering with NuRD complex formation.\",\n      \"method\": \"RNA pulldown, Co-immunoprecipitation, subcellular fractionation, histone acetylation assays, overexpression in gastric cancer cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RNA pulldown without stringent controls; mechanism is cytoplasmic sequestration rather than direct enzymatic characterization\",\n      \"pmids\": [\"27065326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MTA2 promotes HCC proliferation and metastasis through transcriptional repression of FRMD6 (a key upstream component of the Hippo signaling pathway), identified by genome-wide ChIP-seq.\",\n      \"method\": \"ChIP-seq, knockdown/overexpression in vitro and in vivo xenograft models\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq identifying direct binding to FRMD6 with functional consequence, single lab\",\n      \"pmids\": [\"31128910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MTA2 directly binds the promoter of MCM5 (minichromosome maintenance deficient 5) to promote its expression, thereby facilitating gastric cancer growth and metastasis.\",\n      \"method\": \"ChIP assay, in vitro and in vivo overexpression/knockdown functional assays\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single ChIP assay with limited mechanistic follow-up\",\n      \"pmids\": [\"36741260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MTA2 knockdown in HCC cells downregulates PTK7 expression, and PTK7 regulates MMP7 expression and cell migration/invasion through FAK signaling, establishing an MTA2-PTK7-FAK-MMP7 axis in HCC metastasis.\",\n      \"method\": \"siRNA knockdown, FAK inhibitor, recombinant human MMP7 rescue assay, migration/invasion assays\",\n      \"journal\": \"Environmental toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, no direct ChIP or binding assay showing MTA2 directly regulates PTK7 transcription; indirect pathway inference\",\n      \"pmids\": [\"38050825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MTA2 knockdown reduces uPA (urokinase-type plasminogen activator) expression in osteosarcoma cells via ERK1/2 signaling, inhibiting cell migration and invasion; recombinant uPA rescues migration in MTA2-knockdown cells.\",\n      \"method\": \"shRNA knockdown, recombinant human uPA rescue assay, ERK depletion, in vivo metastasis model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pathway inferred from knockdown without direct binding/ChIP evidence linking MTA2 to uPA promoter\",\n      \"pmids\": [\"39248711\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MTA2 is a core subunit of the NuRD (nucleosome remodeling and histone deacetylase) complex that recruits HDAC1 to target gene promoters to repress transcription via histone deacetylation; it forms a stable 2:4 complex with RBBP7 as part of initial NuRD assembly, interacts with MBD3, AIOLOS/IKAROS, and other complex partners, and regulates diverse biological processes including T cell cytokine gene repression (IL-4, IFN-γ), genomic imprinting maintenance (H19, Peg3) in preimplantation embryos, FSHR transcriptional desensitization in Sertoli cells, colonic cell identity through HNF4A chromatin retention, and B cell development; post-translationally, MTA2 is acetylated at K152 by p300 and can be degraded by neutrophil elastase at specific C-terminal sites, and its stability is regulated by ubiquitination; at replication forks, MTA2 interacts with Tipin to facilitate Polymerase α loading and prevent reversed fork accumulation at difficult-to-replicate genomic regions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MTA2 is a core subunit of the NuRD (nucleosome remodeling and histone deacetylase) complex that represses transcription by recruiting HDAC1 to target promoters to deacetylate histones [#2, #4]. Within NuRD it interacts with MBD3 [#0] and forms a stable elongated MTA2-RBBP7 module of 2:4 stoichiometry that represents an initial assembly intermediate of the complex [#8]. Through this repressive activity MTA2 controls diverse developmental and immune programs: it silences cytokine genes such as IL-4 in T cells, with its loss causing lupus-like autoimmunity [#2]; it maintains genomic imprinting of H19 and Peg3 in preimplantation embryos [#3]; it acts as a corepressor of FSHR transcription in Sertoli cells [#4]; it represses Igll1 and VpreB1 via histone deacetylation during B cell development in association with AIOLOS/IKAROS [#10]; and it restrains colonic cell identity by retaining HNF4A on colonic chromatin as part of a SATB2-MTA2 complex [#20]. In cancer, MTA2 is frequently co-opted to repress tumor-suppressor and epithelial genes such as E-cadherin and PTEN through partnerships with Snail, Twist, AIB1 and HIF-1\\u03b1, driving EMT and metastasis [#9, #11, #16, #18]. Beyond chromatin, MTA2 has a replication-associated role: it binds Tipin to support Polymerase \\u03b1 loading onto replicating chromatin and to prevent accumulation of reversed forks at difficult-to-replicate regions [#7]. MTA2 activity is itself tuned by post-translational regulation, including acetylation at K152 by p300 [#6] and proteolytic and ubiquitination-controlled turnover [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing the gene's existence and relationship to MTA1 was the first step, defining MTA2 as a distinct, broadly expressed family member.\",\n      \"evidence\": \"cDNA cloning, Northern blot and FISH mapping (as MTA1-L1)\",\n      \"pmids\": [\"9929979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No function assigned at cloning\", \"Domain architecture not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placing MTA2 in a defined complex answered how it physically connects to chromatin machinery, identifying it as an MBD3-interacting NuRD subunit alongside HDAC1.\",\n      \"evidence\": \"Recombinant protein binding assays with wild-type/mutant MBD3\",\n      \"pmids\": [\"12124384\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and assembly order not defined\", \"No genomic targets identified yet\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Loss-of-function in mice tested the in vivo role of MTA2-NuRD, establishing it as a transcriptional repressor of cytokine genes whose loss causes autoimmunity.\",\n      \"evidence\": \"Whole-body and T cell-specific knockout mice with ChIP-based IL-4 target identification\",\n      \"pmids\": [\"18353770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect targets beyond IL-4 not fully resolved\", \"Mechanism of T cell hyperproliferation not detailed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Embryo knockdown addressed whether MTA2 maintains epigenetic marks, showing it is required for genomic imprinting at H19 and Peg3.\",\n      \"evidence\": \"RNAi in mouse preimplantation embryos, allele-specific expression and bisulfite sequencing\",\n      \"pmids\": [\"20720167\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NuRD links to DNA methylation maintenance not defined\", \"Other imprinted loci not surveyed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The Sertoli cell study dissected a specific corepressor pathway, showing MTA2 recruits HDAC1 to the FSHR promoter within a negative-feedback loop.\",\n      \"evidence\": \"siRNA knockdown, ChIP, and deacetylase activity assays in Sertoli cells\",\n      \"pmids\": [\"23086931\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability beyond Sertoli cells unknown\", \"Composition of MTA2 complex at FSHR not fully defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of K152 acetylation by p300 revealed how MTA2 activity is post-translationally tuned and linked to cancer cell behavior.\",\n      \"evidence\": \"Co-IP, site-directed mutagenesis, proliferation and migration assays\",\n      \"pmids\": [\"24468085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Deacetylase for K152 not identified\", \"Mechanistic consequence on NuRD assembly unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The Tipin interaction uncovered a chromatin-replication role distinct from transcriptional repression, placing MTA2 at replication forks supporting Polymerase \\u03b1 loading.\",\n      \"evidence\": \"Xenopus egg extract replication reconstitution, Co-IP, locus-specific replication assay\",\n      \"pmids\": [\"24830473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NuRD complex or MTA2 alone acts at forks unresolved\", \"Human in vivo confirmation pending\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Structural characterization defined the architecture of the initial NuRD assembly module, showing MTA2-RBBP7 forms an elongated 2:4 complex.\",\n      \"evidence\": \"Purification from HEK293F and negative-stain EM with 3D reconstruction\",\n      \"pmids\": [\"28179136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"High-resolution structure not obtained\", \"How further subunits dock not shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Multiple studies clarified context-specific partners and targets: AIOLOS/IKAROS in B cell development and Snail-directed PTEN repression in cancer.\",\n      \"evidence\": \"Knockout mice, ChIP-seq, H3K27ac analysis, Co-IP, luciferase assays\",\n      \"pmids\": [\"31291582\", \"30814496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct recruiters select target genes not unified\", \"Direct vs cofactor-driven repression not always separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cross-regulation between paralogs was defined, with MTA1 driving neutrophil elastase-mediated cleavage of MTA2 at specific C-terminal sites.\",\n      \"evidence\": \"Immunoblotting, truncation/mutation analysis, NE inhibitor/knockdown\",\n      \"pmids\": [\"30642362\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological contexts of NE cleavage limited\", \"Functional output of cleaved fragments unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"A series of cancer studies established MTA2 as an EMT/metastasis driver recruited by Twist, AIB1 and others to repress E-cadherin, and as a regulator of replication-stress sensitivity.\",\n      \"evidence\": \"Co-IP, ChIP, CUT&TAG origin-binding, PARP inhibitor sensitivity, xenografts\",\n      \"pmids\": [\"33340431\", \"33420368\", \"34280886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue-specific versus general EMT mechanism unresolved\", \"Link between origin binding and transcriptional roles unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The colonic identity study provided a high-resolution developmental mechanism, defining a SATB2-MTA2 complex that retains HNF4A on colonic chromatin to restrain plasticity.\",\n      \"evidence\": \"Proteomics, CRISPR screen, ChIP-seq co-occupancy, colon-specific knockout mice\",\n      \"pmids\": [\"38678016\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MTA2 anchors HNF4A mechanistically not fully resolved\", \"Reversibility of identity switch not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Stability regulation was extended, showing HMGB2 stabilizes MTA2 against ubiquitination to support HIF-1\\u03b1-driven cardiomyocyte proliferation.\",\n      \"evidence\": \"IP-MS, RNA-seq, cardiomyocyte-specific manipulation in MI model\",\n      \"pmids\": [\"41092376\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase for MTA2 not identified\", \"Direct vs indirect HIF-1\\u03b1 stabilization not separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MTA2's distinct activities — NuRD-dependent transcriptional repression, replication-fork support, and context-specific recruiter partnerships — are coordinated within a single cell and selectively engaged across tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model linking chromatin and replication roles\", \"Determinants of target-gene selection across partners unknown\", \"E3 ligase and full PTM code governing MTA2 turnover undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 4, 10, 20]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [17, 20, 24]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 8, 10, 20]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 10, 20]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 11, 20]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [7, 17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 20]}\n    ],\n    \"complexes\": [\"NuRD complex\", \"MTA2-RBBP7 assembly module\", \"SATB2-MTA2 complex\"],\n    \"partners\": [\"HDAC1\", \"MBD3\", \"RBBP7\", \"Tipin\", \"IKZF3\", \"HNF4A\", \"HIF-1A\", \"CHD4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}