{"gene":"CHD4","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2010,"finding":"CHD4 is recruited to DNA-damage sites in a poly(ADP-ribose)-dependent manner and is phosphorylated by ATM kinase. CHD4 promotes repair of DNA double-strand breaks and controls the G1/S cell-cycle transition by regulating p53 deacetylation.","method":"Co-immunoprecipitation, kinase assay, laser micro-irradiation, cell-cycle analysis, loss-of-function (siRNA/shRNA knockdown)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase phosphorylation assay, live-cell imaging, functional cell-cycle readout), replicated by independent lab (PMID:20805324)","pmids":["20693977"],"is_preprint":false},{"year":2010,"finding":"CHD4 knockdown disrupts the chromatin response at the level of RNF168 ubiquitin ligase, impairing local ubiquitylation and BRCA1 assembly at DNA double-strand breaks, and causes enhanced Cdc25A degradation and p21(Cip1) accumulation leading to extended cell cycle delay.","method":"Mass spectrometry screen, siRNA knockdown, immunofluorescence, FRAP, clonogenic survival assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — independent replication of CHD4 DDR role, multiple orthogonal methods, distinct mechanistic findings from concurrent paper","pmids":["20805324"],"is_preprint":false},{"year":1999,"finding":"CHD4 (Mi-2beta) physically associates with ATR kinase and with HDAC2, and other NuRD complex members (HDAC1, MTA1, MTA2) are also detectable in ATR immunoprecipitates, linking the DDR checkpoint kinase to the NuRD chromatin remodeling/deacetylation complex.","method":"Biochemical co-purification, tandem mass spectrometric sequencing, co-immunoprecipitation","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and biochemical co-purification, single lab, two orthogonal methods","pmids":["10545197"],"is_preprint":false},{"year":2009,"finding":"The second PHD finger (PHD2) of CHD4 binds the N-terminus of histone H3; binding is enhanced by H3K9 acetylation (Kd ~0.6 µM) or methylation (H3K9me3, Kd ~0.9 µM) and inhibited by H3K4 methylation (Kd drops to ~2.0 mM) or H3A1 acetylation; phosphorylation of H3T3, T6, or S10 abolishes binding.","method":"Tryptophan fluorescence binding assay, NMR, peptide library screen, mutagenesis, data-driven docking","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding quantification with multiple methods (fluorescence, NMR, mutagenesis), structurally validated","pmids":["19624289"],"is_preprint":false},{"year":2011,"finding":"Solution structure of CHD4 PHD2 in complex with H3K9me3 was determined by NMR, revealing a cation-π recognition mechanism for methylated Lys9. Both PHD1 and PHD2 can bind H3 N-terminal tails, suggesting CHD4 can engage two H3 tails simultaneously on one or two nucleosomes.","method":"NMR structure determination, fluorescence binding assays, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional validation (binding assays + mutagenesis), mechanistically definitive","pmids":["21278251"],"is_preprint":false},{"year":2012,"finding":"Tandem PHD1/2 fingers of CHD4 engage nucleosomes multivalently by simultaneously binding two histone H3 tails; this robust synergistic interaction displaces HP1γ from pericentric sites, disperses the H3K9me3 mark, and is required for the repressive activity of CHD4/NuRD complex.","method":"NMR, fluorescence binding assays, chromatin immunofluorescence, mutagenesis, functional repression assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with nucleosomes, mutagenesis, multiple orthogonal methods in one rigorous study","pmids":["22215588"],"is_preprint":false},{"year":2012,"finding":"CHD4 chromodomains, ATPase/helicase, and C-terminal domains are all required for transcriptional repression by NuRD. The chromodomains, ATPase, and PHD domains (but not the CTD) are required for efficient CHD4 association with promoter chromatin. Loss of MBD2 or DNA methylation impairs CHD4 chromatin association.","method":"Domain deletion/mutation analysis, chromatin immunoprecipitation (ChIP), reporter gene assays, loss-of-function studies","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional reporter assays with multiple domain mutants, single lab","pmids":["23071088"],"is_preprint":false},{"year":2012,"finding":"The PHD and chromo domains regulate CHD4 ATPase activity through intramolecular allosteric communication; SAXS-based shape reconstruction reveals extensive domain-domain interactions that govern the overall regulation of chromatin remodeling.","method":"Small-angle X-ray scattering (SAXS), nucleosome binding ATPase assay, remodeling assay, limited proteolysis, cross-linking and tandem mass spectrometry","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple biochemical and structural methods in single study (SAXS, ATPase assay, remodeling assay, limited proteolysis, cross-linking MS)","pmids":["22575888"],"is_preprint":false},{"year":2012,"finding":"CHD4 PHD, chromo, and helicase domains regulate ATPase activity through intramolecular allostery; DNA binding, histone binding, and ATPase activities are functionally interdependent.","method":"Domain deletion constructs, ATPase assay, DNA/histone binding assay, SAXS molecular shape reconstruction","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assays with domain constructs plus structural data, single lab","pmids":["22749909"],"is_preprint":false},{"year":2011,"finding":"ATM kinase phosphorylates CHD4 in response to ionizing radiation, and this phosphorylation promotes increased chromatin binding/retention and assembly of CHD4 foci at DNA damage sites; phospho-mutant CHD4 (non-phosphorylatable by ATM) fails to show enhanced chromatin retention and causes high rates of spontaneous DNA damage.","method":"Immunofluorescence, chromatin fractionation, phosphorylation assay, overexpression of phospho-mutant, cell survival analysis","journal":"Genome integrity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-mutant functional rescue approach plus chromatin fractionation, single lab","pmids":["21219611"],"is_preprint":false},{"year":2012,"finding":"CHD4 is a BRIT1 (MCPH1) binding partner required for BRIT1 recruitment to DNA damage lesions; BRIT1's BRCT domains mediate interaction with CHD4. CHD4 ATPase-dead mutant impairs BRIT1 recruitment. CHD4 deficiency impairs BRCA1 recruitment and HR repair efficiency, and sensitizes cells to PARP inhibitors.","method":"Co-immunoprecipitation, domain mapping, laser micro-irradiation, siRNA knockdown, HR reporter assay, PARP inhibitor sensitivity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, ATPase-dead mutant, functional HR assay, single lab","pmids":["22219182"],"is_preprint":false},{"year":2006,"finding":"NAB2 transcriptional repression requires interaction with the CHD4 subunit of NuRD through a specific NAB2 repression domain; both NAB proteins can bind CHD3 or CHD4; CHD4 is required for NAB2-mediated repression of the endogenous Rad gene and co-localizes with NAB2 on the Rad promoter in myelinating Schwann cells; the NAB2-CHD4 interaction is regulated by alternative splicing.","method":"Co-immunoprecipitation, domain deletion analysis, ChIP, reporter gene assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ChIP, reporter assay, endogenous gene repression, single lab","pmids":["16574654"],"is_preprint":false},{"year":2015,"finding":"The N-terminal region of CHD4 contains a stable HMG box-like domain (CHD4-N) that binds poly(ADP-ribose) with higher affinity than DNA; the full N-terminal region (but not CHD4-N alone) is essential for full nucleosome remodeling activity and for localizing CHD4 to DNA damage sites.","method":"X-ray crystallography (structure determination), poly(ADP-ribose) binding assays, DNA binding assays, remodeling assay, laser micro-irradiation localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus in vitro binding assays and functional remodeling assay, single lab with multiple methods","pmids":["26565020"],"is_preprint":false},{"year":2016,"finding":"CHD4 is a peripheral (not central hub) component of the NuRD complex; a NuRD sub-complex lacking CHD4 retains HDAC activity as a stable species; addition of recombinant CHD4 to this nucleosome deacetylase complex reconstitutes NuRD with nucleosome remodeling activity.","method":"Biochemical reconstitution, HDAC activity assay, nucleosome remodeling assay, Co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with enzymatic activity assays, single lab, rigorous biochemical evidence","pmids":["27235397"],"is_preprint":false},{"year":2018,"finding":"PAPAS lncRNA tethers to rDNA enhancer via DNA-RNA triplex and recruits CHD4/NuRD through direct interaction between the N-terminal part of CHD4 and an unstructured A-rich region in PAPAS; heat stress-dependent dephosphorylation of CHD4 at three serine residues enhances CHD4/NuRD-RNA interaction and reinforces rDNA transcription repression.","method":"RNA-protein interaction assays, RNA secondary structure mapping, DNA-RNA triplex assay, phosphorylation analysis, deletion/mutation analysis, ChIP","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (triplex assay, protein-RNA interaction, phosphorylation mapping, mutagenesis, ChIP), single lab","pmids":["29907651"],"is_preprint":false},{"year":2017,"finding":"CHD3 and CHD4 form distinct, isoform-specific NuRD complexes (monomeric ATPase each); both exhibit similar intranuclear mobility and accumulate at UV-induced DNA repair sites; CHD3 and CHD4 differ in nuclear localization patterns, target genes, and nucleosome remodeling/positioning behavior in vitro.","method":"Co-immunoprecipitation, FRAP (fluorescence recovery after photobleaching), in vitro nucleosome remodeling assay, transcriptomic analysis, live-cell imaging","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, FRAP, in vitro remodeling assay, multiple orthogonal methods, single lab","pmids":["28977666"],"is_preprint":false},{"year":2018,"finding":"CHD4 interacts with ADNP and HP1 to form the stable ChAHP complex; ADNP mediates complex assembly and recognizes DNA motifs specifying ChAHP binding to euchromatin; ChAHP represses lineage-specific genes by establishing inaccessible chromatin in a locally restricted, H3K9me3-independent manner.","method":"Co-immunoprecipitation, mass spectrometry, ATAC-seq, ChIP-seq, genetic ablation in mouse ES cells","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP/MS complex identification, genome-wide chromatin accessibility, genetic loss-of-function with distinct phenotypic readout, multiple orthogonal methods","pmids":["29795351"],"is_preprint":false},{"year":2013,"finding":"CHD4 is a RanGTP-dependent microtubule-associated protein (MAP) that stabilizes microtubules during mitosis independently of its chromatin remodeling activity; CHD4 binds MTs via its NLS-containing chromatin-binding region, partially localizes to the spindle in mitosis, and its depletion prevents spindle assembly and causes chromosome missegregation.","method":"Xenopus egg extract immunodepletion, RNAi in HeLa and Drosophila S2 cells, live-cell imaging, MT binding assay, spindle assembly assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunodepletion in cell-free system plus RNAi in two cell lines, MT binding assay, defined phenotypic readout; multiple model systems","pmids":["24268414"],"is_preprint":false},{"year":2013,"finding":"CHD4 (Chd4) physically interacts with the PcG protein Ezh2 and is required specifically for PcG-mediated suppression of the GFAP astrogenic marker gene; in vivo depletion of Chd4 in the developing neocortex promotes astrogenesis.","method":"Co-immunoprecipitation, in vivo Chd4 knockdown, immunofluorescence, gene expression analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus in vivo knockdown with defined cellular phenotype, single lab","pmids":["23624931"],"is_preprint":false},{"year":2013,"finding":"GATA3 forms functionally distinct complexes with CHD4: a GATA3/CHD4/p300 transcriptional activation complex at Th2 cytokine loci and a GATA3/CHD4-NuRD repression complex at the Tbx21 locus in Th2 cells; CHD4 is required for Th2-dependent inflammation in vivo.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, reporter assay, in vivo asthma model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, functional knockdown with specific phenotypic readout in vitro and in vivo, single lab","pmids":["23471993"],"is_preprint":false},{"year":2013,"finding":"CHD4-containing NuRD complexes directly bind the promoters of uPAR and thrombospondin-1 in endothelial cells to repress uPAR and activate Thbs1, preventing excessive ECM proteolysis; loss of endothelial CHD4 leads to elevated plasmin activity and vascular rupture at midgestation.","method":"ChIP, conditional knockout mouse model, in vivo and ex vivo vascular analysis, qPCR arrays, genetic rescue (uPA reduction)","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP at specific promoters, conditional KO with defined molecular and physiological phenotype, genetic rescue experiment","pmids":["24348274"],"is_preprint":false},{"year":2014,"finding":"ZFHX4 interacts with CHD4, a core member of the NuRD complex, in glioblastoma tumor-initiating cells; ZFHX4 and CHD4 bind overlapping genomic loci and control similar gene expression programs; ZFHX4 functions as a master regulator of CHD4 activity.","method":"Co-immunoprecipitation, ChIP-seq, gene expression analysis, siRNA knockdown, intracranial xenograft","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP-seq, functional knockdown, single lab","pmids":["24440720"],"is_preprint":false},{"year":2015,"finding":"p300 physically interacts with CHD4 at DNA damage sites (dependent on CHD4's chromodomain and ATPase/helicase domain, and p300's CH2, Bd, and HAT domains); they are co-recruited to DSBs and cooperatively promote homologous recombination repair by facilitating RPA recruitment.","method":"Immunoprecipitation, purified protein pulldown, immunofluorescence, DR-GFP/EJ5-GFP reporter systems, siRNA knockdown","journal":"Mutagenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus purified protein pulldown with domain mapping, functional HR assay, single lab","pmids":["26546801"],"is_preprint":false},{"year":2016,"finding":"CHD4 interacts with PAX3-FOXO1 oncogenic fusion protein via short DNA fragments and co-occupies regulatory regions of PAX3-FOXO1 target genes; CHD4 is an essential coregulator of PAX3-FOXO1 activity required for a subset of target gene expression and for alveolar rhabdomyosarcoma cell viability.","method":"Interactome screen, Co-immunoprecipitation, ChIP-seq, siRNA knockdown, gene expression analysis, in vivo xenograft","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP-seq co-occupancy, functional knockdown with specific phenotype in vitro and in vivo, single lab","pmids":["27760049"],"is_preprint":false},{"year":2017,"finding":"CHD4 recruits repressive chromatin proteins including DNA methyltransferases to sites of oxidative DNA damage (8-OHdG), promoting de novo DNA methylation and epigenetic silencing of tumor suppressor genes; CHD4 is recruited by OGG1 for oxidative damage and by ZMYND8 for double-strand breaks.","method":"Co-immunoprecipitation, ChIP, DNA methylation assays, siRNA knockdown, cell invasion/metastasis assays","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, functional methylation assay, multiple partners identified, single lab","pmids":["28486105"],"is_preprint":false},{"year":2018,"finding":"Loss of CHD4 in the heart triggers aberrant expression of the skeletal muscle gene program; loss of CHD4 in skeletal muscle causes inappropriate cardiac gene expression; in both tissues, mitochondrial function depends on CHD4/NuRD, demonstrating CHD4 maintains striated muscle identity.","method":"Tissue-specific conditional knockout mouse models, transcriptomic analysis, metabolic profiling, histology","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in two independent tissues with distinct molecular and physiological phenotypes, well-controlled genetic approach","pmids":["27166947"],"is_preprint":false},{"year":2018,"finding":"CHD4/NuRD directly represses skeletal and smooth muscle myofibril isoforms in the developing heart; CHD4 binds unique sites in smooth muscle myosin heavy chain, fast skeletal α-actin, and fast skeletal troponin complex genes; loss of CHD4 creates hybrid cardiomyocytes with intercalated skeletal and smooth muscle myofibril components disrupting sarcomere formation.","method":"Conditional knockout mouse model, transcriptomics, ChIP-seq, histology, cardiac function analysis in utero","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with genome-wide CHD4 occupancy (ChIP-seq) and specific molecular phenotype, multiple orthogonal approaches","pmids":["29891665"],"is_preprint":false},{"year":2018,"finding":"CHD4 is recruited to DNA breaks by poly(ADP-ribosyl)ation (PAR)-dependent mechanism, but not through direct PAR binding; CHD4 plays an active role in chromatin remodeling at DNA breaks as part of a two-step mechanism where initial PAR-dependent relaxation (by PARP1/ALC1) promotes CHD4 recruitment for further remodeling.","method":"Live-cell fluorescence three-hybrid assay, laser micro-irradiation, siRNA knockdown, chromatin relaxation assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell assay establishing mechanism of recruitment, functional chromatin relaxation readout, single lab","pmids":["29733391"],"is_preprint":false},{"year":2019,"finding":"CHD4 depletion specifically reduces CHD4 levels (~60%) and derepresses fetal hemoglobin genes in erythroid cells; ZNF410 directly and uniquely activates CHD4 transcription through two evolutionarily conserved clusters of binding sites near the CHD4 gene, and this is the primary mechanism by which ZNF410 controls fetal globin repression.","method":"CRISPR-Cas9 genetic screen, in vitro DNA binding assays, crystallography (ZNF410-DNA structure), xenotransplantation, ChIP-seq","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of upstream regulator plus CRISPR screen, xenotransplantation, ChIP-seq; mechanistically complete pathway from ZNF410 → CHD4 → HbF repression","pmids":["33301730"],"is_preprint":false},{"year":2020,"finding":"Cryo-EM structure of CHD4 engaged with a nucleosome at 3.1 Å resolution shows the ATPase motor binds and distorts nucleosomal DNA at SHL +2, supporting the 'twist defect' model; CHD4 does not unwrap terminal DNA (unlike Chd1), consistent with its repressive function.","method":"Cryo-electron microscopy (cryo-EM) structure determination at 3.1 Å with AMP-PNP","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure of CHD4-nucleosome complex with mechanistic interpretation","pmids":["32543371"],"is_preprint":false},{"year":2020,"finding":"Single-molecule assays reveal that CHD4 binding energy alone (without ATP) triggers conformational changes in nucleosomal DNA at the entry side; during remodeling, entry-side DNA enters continuously while exit-side DNA moves in concerted 4–6 bp steps, indicating CHD4 decouples entry- and exit-side DNA translocation through a strain-buildup mechanism.","method":"Single-molecule fluorescence assays, optical tweezers, ATPase-dead mutant analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — single-molecule reconstitution with mechanistic dissection of translocation mechanism, multiple quantitative approaches","pmids":["32251276"],"is_preprint":false},{"year":2020,"finding":"SIRT6 interacts with CHD4 upon DNA damage and recruits CHD4 to damage sites in an ATM-dependent process; CHD4 displaces HP1 from H3K9me3 at damage sites to promote chromatin relaxation; this SIRT6-CHD4 axis is specifically required for HR in compacted chromatin during G2 phase.","method":"Co-immunoprecipitation, laser micro-irradiation, siRNA knockdown, chromatin accessibility assay, HR reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional chromatin relaxation and HR assay, single lab","pmids":["31970415"],"is_preprint":false},{"year":2020,"finding":"CHD4 physically interacts with HIF1α and HIF2α subunits and enhances HIF-driven transcription; under normoxia CHD4 enrichment at HIF target gene promoters increases RNA Pol II loading through p300; hypoxia promotes CHD4 chromatin binding via HIF1/2α and CHD4 in turn enhances HIF1α recruitment.","method":"Co-immunoprecipitation, ChIP, loss-of-function (siRNA/shRNA), in vivo xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, functional gene expression and in vivo tumor assay, single lab","pmids":["32699137"],"is_preprint":false},{"year":2020,"finding":"Conditional knockout of Chd4 in cerebellar granule neurons increases genome-wide chromatin accessibility and promotes cohesin recruitment preferentially to gene enhancers; loss of Chd4 strengthens interactions among developmentally repressed contact domains and genomic loops, correlating with increased enhancer activity and cohesin occupancy.","method":"Conditional knockout mouse model, ATAC-seq, Hi-C, ChIP-seq, in vivo profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with genome-wide chromatin accessibility, genome architecture (Hi-C), and ChIP-seq, multiple orthogonal approaches","pmids":["32647123"],"is_preprint":false},{"year":2020,"finding":"Chd4 plays a key role in self-antigen expression in medullary thymic epithelial cells (mTECs) by organizing promoter regions of Fezf2-dependent genes and contributing to Aire-mediated self-antigen induction via super-enhancers; Chd4-deficient mTECs show impaired T cell tolerance and autoimmune phenotypes.","method":"Conditional knockout mouse model, gene expression analysis, ChIP-seq, immunophenotyping","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with ChIP-seq mechanistic data plus physiological autoimmune phenotype","pmids":["32601470"],"is_preprint":false},{"year":2019,"finding":"CHD4 regulates RAD51 expression transcriptionally in glioblastoma cells, providing a mechanism by which CHD4 promotes DNA damage resistance; CHD4 suppression defects both the DNA damage response and RAD51 expression.","method":"siRNA/shRNA knockdown, western blot, immunofluorescence, gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — knockdown with specific molecular readout (RAD51 expression), replicated across multiple GBM lines, single lab","pmids":["30872624"],"is_preprint":false},{"year":2022,"finding":"CHD4 is recruited to NuRD super-enhancers in rhabdomyosarcoma where it generates chromatin architecture permissive for PAX3-FOXO1 binding; CHD4 depletion removes HDAC2 from chromatin, leading to spread of histone acetylation, and prevents RNA Pol II positioning at promoters, impeding transcription initiation.","method":"CRISPR NuRD screen, ChIP-seq, ATAC-seq, siRNA knockdown, gene expression analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen plus ChIP-seq, ATAC-seq, functional knockout, multiple mechanistic readouts","pmids":["32744500"],"is_preprint":false},{"year":2022,"finding":"CHD4 is recruited by cardiac transcription factors GATA4, NKX2-5, and TBX5 to specific cardiac loci; CHD4 physically interacts with these factors and co-occupies their target gene regulatory regions to repress noncardiac gene programs; deletion of CHD4-bound silencer elements at Acta1 and Myh11 leads to inappropriate skeletal/smooth muscle gene misexpression in the heart.","method":"Mass spectrometry (Co-IP-MS), ChIP-seq, transcriptomics, conditional KO, in vivo silencer deletion","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification of cardiac TF interactions, ChIP-seq co-occupancy, in vivo silencer validation, multiple orthogonal methods","pmids":["35450884"],"is_preprint":false},{"year":2022,"finding":"CHD4 N-terminal intrinsically disordered region (IDR) promotes remodeling integrity in a composition- but not sequence-dependent manner; the C-terminal region harbors an auto-inhibitory region that contacts the helicase domain; auto-inhibition is relieved by a C-terminal SANT-SLIDE domain that binds substrate DNA.","method":"Single-molecule assays, domain deletion/swap constructs, ATPase assay, nucleosome remodeling assay, SAXS","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro single-molecule and biochemical assays with multiple domain constructs, mechanistically rigorous","pmids":["36473839"],"is_preprint":false},{"year":2022,"finding":"RNA inhibits CHD4 chromatin binding and nucleosome remodeling activity; CHD4 binds G-rich RNA via two intrinsically disordered regions; RNA competes with nucleosome substrate to inhibit CHD4-mediated nucleosome mobilization; this mechanism is evolutionarily conserved between Drosophila dMi-2 and human CHD4.","method":"iCLIP (individual nucleotide resolution CLIP), in vitro RNA binding assay, nucleosome remodeling assay, pharmacological transcription inhibition, RNase digestion","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of RNA inhibition of remodeling, biochemical mechanistic dissection, conserved in two organisms","pmids":["35649367"],"is_preprint":false},{"year":2021,"finding":"ZNF410 knockout reduces CHD4 levels by ~60% and substantially de-represses fetal hemoglobin genes; ZNF410 regulates fetal globin exclusively through CHD4, and two CHD4 genomic regulatory clusters with 27 combined ZNF410 motifs completely account for ZNF410's effects on fetal globin repression.","method":"CRISPR-Cas9 screen, knockout mouse model (Zfp410), xenotransplantation, gene expression analysis, ChIP-seq","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — independent replication of ZNF410→CHD4→HbF axis with in vivo mouse model and xenotransplantation, CRISPR screen validation","pmids":["33859416"],"is_preprint":false},{"year":2021,"finding":"CHD4 conceals aberrant CTCF-binding sites embedded in H3K9me3-enriched B2 SINE heterochromatin by regulating chromatin accessibility; CHD4 depletion allows aberrant CTCF recruitment within TADs, disrupting local TAD organization; RNA-binding IDRs of CHD4 are required to prevent this aberrant CTCF binding.","method":"CHD4 conditional KO/depletion, ATAC-seq, Hi-C, ChIP-seq, domain deletion analysis in mESCs","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide chromatin accessibility, Hi-C, ChIP-seq with domain deletion, single lab","pmids":["34764232"],"is_preprint":false},{"year":2022,"finding":"CHD4 interacts with SMYD1, a striated muscle-restricted histone methyltransferase, in cardiac tissue; CHD4 and SMYD1 co-repress a group of common genes and pathways including glycolysis, response to hypoxia, and angiogenesis in the developing heart.","method":"Quantitative proteomics (Co-IP-MS), transcriptomics, ATAC-seq, conditional KO mouse hearts","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics identifies interaction, transcriptomic and chromatin accessibility data from KO, single lab","pmids":["38619323"],"is_preprint":false},{"year":2023,"finding":"A de novo CHD4 missense mutation (M202I/M195I in mice) causes augmented affinity of CHD4 protein for endocardial BRG1; this enhanced CHD4M195I-BRG1 interaction prevents derepression of Adamts1 transcription, reducing ADAMTS1-mediated trabeculation termination and causing biventricular hypertrabeculation; administration of ADAMTS1 rescues hypertrabeculation defects.","method":"Humanized mouse model, Co-IP with MS, ChIP, transcriptomics, genetic rescue (ADAMTS1 administration), echocardiography","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — humanized mouse model with Co-IP-MS, ChIP, transcriptomics, and genetic rescue experiment, mechanistically complete","pmids":["37254794"],"is_preprint":false},{"year":2022,"finding":"CHD4 depletion in Ewing sarcoma leads to global increase in DNA accessibility and induction of spontaneous DNA damage, increasing susceptibility to DNA-damaging agents; CHD4 and NuRD co-localize with EWS-FLI1 at enhancers/super-enhancers but CHD4 promotes cell survival through chromatin structure regulation rather than modulating EWS-FLI1 activity.","method":"CRISPR/Cas9 inactivation screen, ATAC-seq, ChIP-seq, siRNA knockdown, in vivo xenograft, PARP inhibitor combination","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR screen, ATAC-seq, ChIP-seq, functional in vivo model, single lab","pmids":["37963210"],"is_preprint":false},{"year":2024,"finding":"CHD4 acts as a chromatin proof-reading enzyme by promoting nucleosome positioning over GATA3 binding motifs to compete with transcription factor-DNA interaction; CHD4 depletion leads to redistribution of transcription factors to previously unoccupied sites and prevents appropriate chromatin opening during GATA3-induced reprogramming.","method":"ATAC-seq, ChIP-seq, siRNA knockdown, cellular reprogramming assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide chromatin accessibility and TF occupancy assays with functional reprogramming readout, single lab","pmids":["38281186"],"is_preprint":false},{"year":2016,"finding":"CHD4 represses Wnt signaling in vascular endothelial cells; endothelial deletion of Chd4 upregulates Wnt-responsive transcription factor Tcf7 and Wnt target genes including Pitx2; BRG1 and CHD4 antagonistically modulate Wnt signaling in developing yolk sac vessels.","method":"Conditional knockout mouse models (single and double KO), gene expression analysis, Wnt target gene analysis, pharmacological rescue (LiCl)","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific molecular readout (Wnt targets), double KO epistasis, pharmacological rescue, single lab","pmids":["22290435"],"is_preprint":false},{"year":2013,"finding":"CHD4/NuRD directly binds the promoter of rDNA transcription silencer TIP5 and negatively regulates TIP5 expression, thereby inhibiting rDNA methylation and maintaining demethylated state of rDNA promoters; CHD4/NuRD controls rDNA methylation status through cross-talk with the NoRC complex.","method":"ChIP, siRNA knockdown, DNA methylation analysis, gene expression analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at specific promoter, functional knockdown with methylation readout, single lab","pmids":["23796711"],"is_preprint":false},{"year":2007,"finding":"In Xenopus, CHD4/Mi-2beta controls the neuroectoderm/mesoderm boundary by suppressing Sip1 transcription through direct binding to the 5' end of the Sip1 gene body; CHD4/Sip1 epistasis determines the ON threshold for Nodal-dependent Xbra transcription.","method":"Gain and loss of CHD4 function in Xenopus embryos, ChIP, epistasis analysis, gene expression analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstration of direct Sip1 binding plus genetic epistasis in whole organism, mechanistically complete pathway","pmids":["17438000"],"is_preprint":false},{"year":2024,"finding":"DNA damage increases N6-methyladenosine (m6A) marks on the lncRNA NEAT1, promoting its accumulation at promoter-associated DSBs; NEAT1 releases CHD4 from NEAT1 at DSBs to fine-tune histone acetylation; this genome-protective role of NEAT1 requires the RNA methyltransferase METTL3 and involves CHD4 release from NEAT1 to regulate chromatin at damage sites.","method":"m6A RNA modification analysis, m6A-seq, NEAT1 depletion, siRNA knockdown, DSB focus formation assay, histone acetylation analysis","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA modification analysis, loss-of-function with specific chromatin acetylation readout, single lab","pmids":["39362776"],"is_preprint":false},{"year":2013,"finding":"Chd4 acts as a corepressor of Sox9 during BMP-2-induced chondrogenesis; Chd4 interacts with Hdac1/2, Kap1, and Cbx1 and binds at the Sox9 promoter (-207/-148 region); let-7a miRNA targets the 3'UTR of Chd4 to promote chondrogenesis.","method":"ChIP, nuclease hypersensitivity assay, Co-IP (inferred from NuRD complex), siRNA knockdown, proteomics","journal":"Journal of bone and mineral research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct Sox9 promoter binding, nuclease hypersensitivity, functional knockdown, single lab","pmids":["23519980"],"is_preprint":false},{"year":2022,"finding":"CHD4 interacts with the transcription factor Znf219 in cardiac tissue; Znf219 represses skeletal muscle sarcomeric genes in cardiomyocytes; aberrant expression of skeletal muscle sarcomere proteins in Znf219 knockdown mouse hearts leads to arrhythmias with increased PR interval.","method":"Co-immunoprecipitation, in vitro/in vivo knockdown, cardiac phenotyping, gene expression analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction plus in vivo knockdown with defined arrhythmic phenotype, single lab","pmids":["36076959"],"is_preprint":false},{"year":2022,"finding":"FBXW7 degrades CHD4 protein via ubiquitination; CHD4 promotes nuclear translocation of β-catenin to activate the Wnt/β-catenin pathway; the FBXW7-CHD4-Wnt/β-catenin axis regulates cancer stem cell maintenance in triple-negative breast cancer.","method":"Immunoprecipitation-mass spectrometry, ubiquitination assay, Co-IP, western blot, functional assays (sphere formation, invasion), in vivo xenograft","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS identifies substrate, ubiquitination assay confirms degradation, functional pathway validation, single lab","pmids":["38268032"],"is_preprint":false},{"year":2023,"finding":"CHD4/NuRD directly activates transcription of PLS3 (Plastin 3) by binding the PLS3 promoter in an activating manner; CHD4/NuRD activity at the PLS3 promoter is demonstrated by ChIP and dual-luciferase assays; CHD4 expression is co-regulated with PLS3 and DXZ4 macrosatellite copy number.","method":"siRNA knockdown, CHD4 overexpression, ChIP, dual-luciferase promoter assay","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating promoter binding plus functional luciferase assay, single lab","pmids":["36812914"],"is_preprint":false},{"year":2019,"finding":"CHD4 directly binds the Ripk3 promoter in hypoxic endothelial cells to repress Ripk3 transcription and prevent histone acetylation at that promoter; genetic deletion of Chd4 upregulates Ripk3, and concomitant deletion of Ripk3 partially rescues vascular rupture and lethality in Chd4 mutants.","method":"Conditional knockout mouse model, ChIP, histone acetylation analysis, genetic epistasis (Chd4/Ripk3 double KO)","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating promoter binding, genetic epistasis with partial rescue, conditional KO with mechanistic molecular readout, single lab","pmids":["31235857"],"is_preprint":false},{"year":2021,"finding":"CHD4 interacts with the GDNF-responsive transcription factor SALL4 in spermatogonia (independent of NuRD) to regulate gene expression controlling spermatogonial stem cell fate decisions; CHD4 loss significantly impairs SSC regenerative capacity with ~50% reduction in colonization.","method":"Co-immunoprecipitation, spermatogonial transplantation, scRNA-seq, siRNA knockdown","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifies SALL4 interaction, functional transplantation assay with scRNA-seq, single lab","pmids":["33961790"],"is_preprint":false},{"year":2016,"finding":"CHD4 directly binds the proximal promoter of Ucp1 and represses thermogenic gene expression in adipocytes; harmine treatment activates the RAC1-MEK-ERK pathway which triggers CHD4 displacement from the Ucp1 promoter through ERK-mediated post-translational modification of CHD4.","method":"ChIP, post-translational modification analysis, siRNA knockdown, pharmacological treatment, reporter assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct Ucp1 promoter binding, pathway inhibition experiments, single lab","pmids":["27805061"],"is_preprint":false},{"year":2019,"finding":"CHD4 loss in mature B cells impairs class switch recombination by reducing AID (activation-induced cytidine deaminase) targeting to the Igh locus; CHD4 directly binds H3K9me3 at the Igh locus and is required for optimal AID recruitment; CHD4 also represses p53 to promote B cell proliferation.","method":"Conditional knockout mouse model, ChIP (H3K9me3), flow cytometry (CSR assay), gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific molecular mechanism (H3K9me3 binding, AID recruitment, p53 repression), single lab","pmids":["31042474"],"is_preprint":false},{"year":2022,"finding":"CHD4 promotes the interaction between ERK1/2 and MEK1/2, resulting in continuous activation of the MEK/ERK pathway; CHD4 mediates drug efflux to reduce intracellular cisplatin concentration; CHD4 physically interacts with ERK1/2 and MEK1/2 in gastric cancer cells.","method":"Immunoprecipitation, proximity ligation assay, LC-MS, western blot, drug sensitivity assay, xenograft","journal":"Drug resistance updates","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP plus proximity ligation, single lab, mechanistic claims of CHD4-ERK/MEK interaction without in vitro reconstitution","pmids":["36603431"],"is_preprint":false},{"year":2018,"finding":"CHD4 mutations R975H and R1162W reduce CHD4 protein stability, phenocopying CHD4 depletion to increase cancer stem cell marker CD133 expression; mutant CHD4 activates TGFβ signaling to promote stemness; mutant CHD4 does not impair NuRD complex formation.","method":"Genetic engineering, Co-IP (NuRD complex), western blot (protein stability), sphere formation, in vivo tumorigenicity, TGFβ inhibitor treatment","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirms NuRD complex integrity, protein stability assay, pathway inhibitor rescue, single lab","pmids":["29888111"],"is_preprint":false},{"year":2022,"finding":"CHD4 mediates SOX2 transcriptional repression by binding the SOX2 promoter in a TRPS1-dependent manner; CHD4 requires TRPS1 for promoter occupancy, and TRPS1 abolishes CHD4-mediated transcriptional activation of SOX2 in luminal breast cancer.","method":"ChIP, Co-IP, siRNA knockdown, reporter assay","journal":"Cellular signalling","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP plus Co-IP in single lab, no mutagenesis or reconstitution","pmids":["36075559"],"is_preprint":false}],"current_model":"CHD4 is the catalytic ATPase core of the NuRD (nucleosome remodeling and deacetylase) complex and also operates in NuRD-independent contexts; it slides nucleosomes by decoupling continuous entry-side DNA translocation from concerted 4–6 bp exit-side steps (twist-defect mechanism, confirmed by single-molecule assays and cryo-EM), with its activity allosterically regulated by intramolecular domain communication involving its tandem PHD fingers (which bivalently recognize H3 N-terminal tails with preference for unmodified H3K4 and methylated/acetylated H3K9), chromodomains, and newly characterized IDR and SANT-SLIDE auto-inhibitory C-terminal regions; in the DDR, CHD4 is recruited to DSBs by poly(ADP-ribosyl)ation and is phosphorylated by ATM, where it facilitates chromatin relaxation, promotes RNF168/BRCA1 assembly, and enables homologous recombination; it also stabilizes microtubules as a RanGTP-dependent MAP to support bipolar spindle formation; in transcriptional regulation it is directed to specific genomic loci by transcription factors (GATA4, NKX2-5, GATA3, ZNF410, ADNP/HP1 in ChAHP) and by lncRNAs (PAPAS via RNA-triplex), where it represses noncardiac, non-B-cell, and fetal globin gene programs and also acts as a co-activator of HIF-mediated transcription; RNA binding to CHD4 intrinsically disordered regions inhibits its chromatin association and remodeling activity, providing a transcription-coupled brake on repressive remodeling."},"narrative":{"mechanistic_narrative":"CHD4 is an ATP-dependent chromatin remodeling ATPase that serves as the catalytic engine of the NuRD nucleosome remodeling and deacetylase complex, where it is a peripheral subunit whose addition to a stable HDAC-containing core reconstitutes nucleosome remodeling activity [PMID:27235397]. Mechanistically, CHD4 slides nucleosomes by distorting DNA at the SHL +2 position without unwrapping terminal DNA, a feature consistent with its repressive role [PMID:32543371], and it decouples continuous entry-side DNA translocation from concerted 4–6 bp exit-side steps via a strain-buildup (twist-defect) mechanism [PMID:32251276]. Its activity is governed by intramolecular allostery among its tandem PHD fingers, chromodomains, helicase, and C-terminal regions [PMID:22575888, PMID:36473839]: the PHD fingers bivalently engage two histone H3 N-terminal tails with preference for unmodified H3K4 and methylated/acetylated H3K9, an interaction required for repression and for displacing HP1γ from H3K9me3-marked chromatin [PMID:19624289, PMID:22215588], while an N-terminal IDR supports remodeling integrity and a C-terminal auto-inhibitory region is relieved by SANT-SLIDE DNA binding [PMID:36473839]. CHD4 is targeted to specific loci by transcription factors—including cardiac GATA4/NKX2-5/TBX5 to repress noncardiac myofibril programs [PMID:35450884, PMID:29891665], GATA3 in T cells [PMID:23471993], and ADNP/HP1 in the ChAHP complex [PMID:29795351]—and by lncRNAs such as PAPAS via DNA-RNA triplex tethering [PMID:29907651]. In the DNA damage response, CHD4 is recruited to double-strand breaks in a poly(ADP-ribosyl)ation-dependent manner [PMID:20693977, PMID:29733391], is phosphorylated by ATM [PMID:21219611], and promotes RNF168/BRCA1 chromatin assembly, chromatin relaxation, and homologous recombination [PMID:20805324, PMID:31970415]. CHD4 also functions independently of chromatin as a RanGTP-dependent microtubule-associated protein that stabilizes the mitotic spindle [PMID:24268414]. Globally, it represses lineage-inappropriate gene programs, restricts chromatin accessibility, and controls genome architecture by limiting aberrant cohesin and CTCF occupancy [PMID:32647123, PMID:34764232], and RNA binding to its intrinsically disordered regions provides a transcription-coupled brake on its remodeling activity [PMID:35649367]. A de novo CHD4 missense mutation that augments its affinity for endocardial BRG1 causes biventricular hypertrabeculation through ADAMTS1 misregulation [PMID:37254794].","teleology":[{"year":1999,"claim":"Established that CHD4 physically links a chromatin deacetylase/remodeling complex to DNA-damage checkpoint signaling, anchoring it within the NuRD complex.","evidence":"Biochemical co-purification, mass spectrometry, and Co-IP showing CHD4 associates with ATR, HDAC1/2, and MTA proteins","pmids":["10545197"],"confidence":"Medium","gaps":["Did not establish whether the ATR association is direct or NuRD-mediated","No functional consequence of the CHD4-ATR link demonstrated"]},{"year":2009,"claim":"Defined the histone-mark code read by CHD4's PHD2 finger, explaining how CHD4 is recruited to and discriminates among modified nucleosomes.","evidence":"Fluorescence/NMR binding assays, peptide library screen, and mutagenesis quantifying PHD2-H3 tail affinities","pmids":["19624289"],"confidence":"High","gaps":["Binding measured on peptides, not nucleosomes","Did not address how mark reading is coupled to ATPase activity"]},{"year":2010,"claim":"Demonstrated CHD4's direct role in the DNA damage response, showing PAR-dependent recruitment, ATM phosphorylation, and control of RNF168/BRCA1 assembly and the G1/S transition.","evidence":"Two independent studies using laser micro-irradiation, kinase assays, MS screens, immunofluorescence, FRAP, and clonogenic survival","pmids":["20693977","20805324"],"confidence":"High","gaps":["Did not resolve whether PAR recruitment is direct binding or indirect","Mechanism linking remodeling activity to RNF168/BRCA1 loading not defined"]},{"year":2012,"claim":"Showed that CHD4's PHD, chromo, and helicase domains communicate allosterically to regulate ATPase and remodeling activity, and that multivalent dual-H3-tail engagement underlies NuRD repression and HP1γ displacement.","evidence":"SAXS, cross-linking MS, limited proteolysis, ATPase/remodeling assays, NMR, and chromatin immunofluorescence across multiple studies","pmids":["22575888","22749909","22215588","23071088"],"confidence":"High","gaps":["No atomic-resolution structure of the full multidomain protein on a nucleosome","How transcription-factor recruitment intersects with allosteric regulation unresolved"]},{"year":2013,"claim":"Revealed a chromatin-independent function: CHD4 acts as a RanGTP-dependent microtubule-associated protein required for bipolar spindle assembly.","evidence":"Xenopus egg extract immunodepletion, RNAi in HeLa and S2 cells, MT-binding and spindle assembly assays","pmids":["24268414"],"confidence":"High","gaps":["Structural basis of MT binding not defined","Relationship between spindle role and NuRD function unclear"]},{"year":2016,"claim":"Positioned CHD4 as a peripheral, exchangeable catalytic subunit of NuRD whose recruitment confers remodeling onto a stable deacetylase core.","evidence":"Biochemical reconstitution with HDAC and nucleosome remodeling activity assays","pmids":["27235397"],"confidence":"High","gaps":["Stoichiometry and dynamics of CHD4 exchange in vivo not addressed","Whether peripheral architecture differs across NuRD subtypes unknown"]},{"year":2018,"claim":"Identified CHD4 as the master genomic effector through which transcription factors and lncRNAs enforce lineage-specific repression, including ZNF410-driven CHD4 expression controlling fetal globin and ADNP-directed ChAHP repression.","evidence":"CRISPR screens, ChIP-seq, ATAC-seq, crystallography of ZNF410-DNA, RNA-triplex and protein-RNA interaction assays, conditional knockouts across multiple tissues","pmids":["29795351","29907651","33301730","27166947","29891665"],"confidence":"High","gaps":["How distinct recruiters compete for a limited CHD4 pool not resolved","Whether repression at all loci requires catalytic remodeling or only occupancy unclear"]},{"year":2020,"claim":"Provided the mechanistic basis of CHD4 remodeling, showing it distorts DNA at SHL +2 without unwrapping terminal DNA and decouples entry- and exit-side translocation through strain buildup.","evidence":"Cryo-EM at 3.1 Å with AMP-PNP and single-molecule fluorescence/optical tweezer assays with ATPase-dead mutants","pmids":["32543371","32251276"],"confidence":"High","gaps":["Structures lack the regulatory N- and C-terminal domains in context","How allosteric inputs modulate the twist-defect step not visualized"]},{"year":2022,"claim":"Defined autoregulatory and RNA-mediated brakes on CHD4: a C-terminal auto-inhibitory region relieved by SANT-SLIDE DNA binding, and a conserved RNA-IDR interaction that competes with nucleosome substrate to inhibit remodeling.","evidence":"Single-molecule and ATPase/remodeling assays with domain constructs, SAXS, and iCLIP with in vitro RNA competition assays","pmids":["36473839","35649367"],"confidence":"High","gaps":["In vivo significance of RNA inhibition during transcription not quantified","How IDR composition tunes activity at specific loci unclear"]},{"year":2023,"claim":"Linked a de novo CHD4 missense mutation to a developmental phenotype, showing gain of BRG1 affinity disrupts cardiac trabeculation termination via ADAMTS1.","evidence":"Humanized mouse model with Co-IP-MS, ChIP, transcriptomics, and ADAMTS1 genetic rescue","pmids":["37254794"],"confidence":"High","gaps":["Whether the gain-of-function mechanism generalizes to other CHD4 patient mutations unknown","Structural basis of enhanced BRG1 binding not defined"]},{"year":2024,"claim":"Extended CHD4's role to genome surveillance and proof-reading, positioning nucleosomes over transcription-factor motifs and being released from damage-associated lncRNAs to fine-tune chromatin.","evidence":"ATAC-seq, ChIP-seq, reprogramming assays, and m6A-seq with NEAT1 depletion","pmids":["38281186","39362776"],"confidence":"Medium","gaps":["Direct biochemical demonstration of competitive nucleosome positioning at TF motifs lacking","Generality of lncRNA-mediated CHD4 release across damage contexts unestablished"]},{"year":null,"claim":"How the many competing recruiters (sequence-specific TFs, lncRNAs, DDR signals, and inhibitory RNAs) are integrated to direct a limited cellular CHD4 pool to the correct loci at the correct time remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No quantitative model partitioning CHD4 among NuRD, ChAHP, and NuRD-independent pools","Structural picture of full-length CHD4 with regulatory domains engaged on a nucleosome lacking","Rules governing activation versus repression at TF-recruited loci undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[29,30,38]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[29,30,13]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[3,4,5]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8,12,30]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[39,14,49]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[6,37,16]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,15,16]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,1,30]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[13,16,33]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,37,28]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,1,31]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[26,37,48]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[17,0]}],"complexes":["NuRD","ChAHP"],"partners":["HDAC2","MTA1","ADNP","GATA3","GATA4","BRG1","HP1","ZNF410"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14839","full_name":"ATP-dependent chromatin remodeler CHD4","aliases":["Chromo domain-containing protein 4","CHD-4","Mi-2 autoantigen 218 kDa protein","Mi2-beta"],"length_aa":1912,"mass_kda":218.0,"function":"ATP-dependent chromatin-remodeling factor that binds and distorts nucleosomal DNA (PubMed:28977666, PubMed:32543371). Acts as a component of the histone deacetylase NuRD complex which participates in the remodeling of chromatin (PubMed:16428440, PubMed:17626165, PubMed:28977666, PubMed:9804427). Localizes to acetylated damaged chromatin in a ZMYND8-dependent manner, to promote transcriptional repression and double-strand break repair by homologous recombination (PubMed:25593309). Involved in neurogenesis (By similarity)","subcellular_location":"Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q14839/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CHD4","classification":"Common Essential","n_dependent_lines":1170,"n_total_lines":1208,"dependency_fraction":0.9685430463576159},"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":"CBX1","stoichiometry":0.2},{"gene":"CSNK2B","stoichiometry":0.2},{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"DYNLL2","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/CHD4","total_profiled":1310},"omim":[{"mim_id":"619427","title":"ZINC FINGER PROTEIN 410; ZNF410","url":"https://www.omim.org/entry/619427"},{"mim_id":"618672","title":"INTELLECTUAL DEVELOPMENTAL DISORDER WITH SPEECH DELAY, AUTISM, AND DYSMORPHIC FACIES; IDDSADF","url":"https://www.omim.org/entry/618672"},{"mim_id":"617159","title":"SIFRIM-HITZ-WEISS SYNDROME; SIHIWES","url":"https://www.omim.org/entry/617159"},{"mim_id":"616114","title":"CHROMODOMAIN HELICASE DNA-BINDING PROTEIN 6; CHD6","url":"https://www.omim.org/entry/616114"},{"mim_id":"614998","title":"GATA ZINC FINGER DOMAIN-CONTAINING PROTEIN 2B; GATAD2B","url":"https://www.omim.org/entry/614998"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Mitotic spindle","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CHD4"},"hgnc":{"alias_symbol":["Mi-2b","Mi2-BETA"],"prev_symbol":[]},"alphafold":{"accession":"Q14839","domains":[{"cath_id":"3.30.40.10","chopping":"369-415","consensus_level":"medium","plddt":81.0109,"start":369,"end":415},{"cath_id":"-","chopping":"462-517_535-634","consensus_level":"medium","plddt":84.5901,"start":462,"end":634},{"cath_id":"3.40.50.10810","chopping":"702-961","consensus_level":"high","plddt":88.1797,"start":702,"end":961},{"cath_id":"3.40.50.300","chopping":"968-978_1045-1204_1250-1255","consensus_level":"high","plddt":85.5728,"start":968,"end":1255},{"cath_id":"-","chopping":"1405-1488","consensus_level":"medium","plddt":78.0246,"start":1405,"end":1488},{"cath_id":"1.10.390","chopping":"150-213","consensus_level":"medium","plddt":85.3992,"start":150,"end":213}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14839","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14839-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14839-F1-predicted_aligned_error_v6.png","plddt_mean":64.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CHD4","jax_strain_url":"https://www.jax.org/strain/search?query=CHD4"},"sequence":{"accession":"Q14839","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14839.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14839/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14839"}},"corpus_meta":[{"pmid":"20693977","id":"PMC_20693977","title":"Regulation of DNA-damage responses and cell-cycle progression by the chromatin remodelling factor CHD4.","date":"2010","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/20693977","citation_count":301,"is_preprint":false},{"pmid":"20805324","id":"PMC_20805324","title":"The chromatin-remodeling factor CHD4 coordinates signaling and repair after DNA damage.","date":"2010","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/20805324","citation_count":190,"is_preprint":false},{"pmid":"28486105","id":"PMC_28486105","title":"CHD4 Has Oncogenic Functions in Initiating and Maintaining Epigenetic Suppression of Multiple Tumor Suppressor Genes.","date":"2017","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/28486105","citation_count":157,"is_preprint":false},{"pmid":"29795351","id":"PMC_29795351","title":"Activity-dependent neuroprotective protein recruits HP1 and CHD4 to control lineage-specifying genes.","date":"2018","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/29795351","citation_count":156,"is_preprint":false},{"pmid":"25737278","id":"PMC_25737278","title":"Resistance to therapy in BRCA2 mutant cells due to loss of the nucleosome remodeling factor CHD4.","date":"2015","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/25737278","citation_count":138,"is_preprint":false},{"pmid":"21278251","id":"PMC_21278251","title":"Plant homeodomain (PHD) fingers of CHD4 are histone H3-binding modules with preference for unmodified H3K4 and methylated H3K9.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21278251","citation_count":134,"is_preprint":false},{"pmid":"27616479","id":"PMC_27616479","title":"De Novo Mutations in CHD4, an ATP-Dependent Chromatin Remodeler Gene, Cause an Intellectual Disability Syndrome with Distinctive Dysmorphisms.","date":"2016","source":"American journal of human 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endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/35521759","citation_count":9,"is_preprint":false},{"pmid":"38281186","id":"PMC_38281186","title":"Genomic transcription factor binding site selection is edited by the chromatin remodeling factor CHD4.","date":"2024","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/38281186","citation_count":9,"is_preprint":false},{"pmid":"35323946","id":"PMC_35323946","title":"Divergent regulatory roles of NuRD chromatin remodeling complex subunits GATAD2 and CHD4 in Caenorhabditis elegans.","date":"2022","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35323946","citation_count":9,"is_preprint":false},{"pmid":"36075559","id":"PMC_36075559","title":"CHD4 mediates SOX2 transcription through TRPS1 in luminal breast cancer.","date":"2022","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/36075559","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47733,"output_tokens":14287,"usd":0.178752,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":26894,"output_tokens":4567,"usd":0.124323,"stage2_stop_reason":"end_turn"},"total_usd":0.303075,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"CHD4 is recruited to DNA-damage sites in a poly(ADP-ribose)-dependent manner and is phosphorylated by ATM kinase. CHD4 promotes repair of DNA double-strand breaks and controls the G1/S cell-cycle transition by regulating p53 deacetylation.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, laser micro-irradiation, cell-cycle analysis, loss-of-function (siRNA/shRNA knockdown)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase phosphorylation assay, live-cell imaging, functional cell-cycle readout), replicated by independent lab (PMID:20805324)\",\n      \"pmids\": [\"20693977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CHD4 knockdown disrupts the chromatin response at the level of RNF168 ubiquitin ligase, impairing local ubiquitylation and BRCA1 assembly at DNA double-strand breaks, and causes enhanced Cdc25A degradation and p21(Cip1) accumulation leading to extended cell cycle delay.\",\n      \"method\": \"Mass spectrometry screen, siRNA knockdown, immunofluorescence, FRAP, clonogenic survival assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independent replication of CHD4 DDR role, multiple orthogonal methods, distinct mechanistic findings from concurrent paper\",\n      \"pmids\": [\"20805324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CHD4 (Mi-2beta) physically associates with ATR kinase and with HDAC2, and other NuRD complex members (HDAC1, MTA1, MTA2) are also detectable in ATR immunoprecipitates, linking the DDR checkpoint kinase to the NuRD chromatin remodeling/deacetylation complex.\",\n      \"method\": \"Biochemical co-purification, tandem mass spectrometric sequencing, co-immunoprecipitation\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and biochemical co-purification, single lab, two orthogonal methods\",\n      \"pmids\": [\"10545197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The second PHD finger (PHD2) of CHD4 binds the N-terminus of histone H3; binding is enhanced by H3K9 acetylation (Kd ~0.6 µM) or methylation (H3K9me3, Kd ~0.9 µM) and inhibited by H3K4 methylation (Kd drops to ~2.0 mM) or H3A1 acetylation; phosphorylation of H3T3, T6, or S10 abolishes binding.\",\n      \"method\": \"Tryptophan fluorescence binding assay, NMR, peptide library screen, mutagenesis, data-driven docking\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding quantification with multiple methods (fluorescence, NMR, mutagenesis), structurally validated\",\n      \"pmids\": [\"19624289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Solution structure of CHD4 PHD2 in complex with H3K9me3 was determined by NMR, revealing a cation-π recognition mechanism for methylated Lys9. Both PHD1 and PHD2 can bind H3 N-terminal tails, suggesting CHD4 can engage two H3 tails simultaneously on one or two nucleosomes.\",\n      \"method\": \"NMR structure determination, fluorescence binding assays, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional validation (binding assays + mutagenesis), mechanistically definitive\",\n      \"pmids\": [\"21278251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tandem PHD1/2 fingers of CHD4 engage nucleosomes multivalently by simultaneously binding two histone H3 tails; this robust synergistic interaction displaces HP1γ from pericentric sites, disperses the H3K9me3 mark, and is required for the repressive activity of CHD4/NuRD complex.\",\n      \"method\": \"NMR, fluorescence binding assays, chromatin immunofluorescence, mutagenesis, functional repression assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with nucleosomes, mutagenesis, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"22215588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CHD4 chromodomains, ATPase/helicase, and C-terminal domains are all required for transcriptional repression by NuRD. The chromodomains, ATPase, and PHD domains (but not the CTD) are required for efficient CHD4 association with promoter chromatin. Loss of MBD2 or DNA methylation impairs CHD4 chromatin association.\",\n      \"method\": \"Domain deletion/mutation analysis, chromatin immunoprecipitation (ChIP), reporter gene assays, loss-of-function studies\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional reporter assays with multiple domain mutants, single lab\",\n      \"pmids\": [\"23071088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The PHD and chromo domains regulate CHD4 ATPase activity through intramolecular allosteric communication; SAXS-based shape reconstruction reveals extensive domain-domain interactions that govern the overall regulation of chromatin remodeling.\",\n      \"method\": \"Small-angle X-ray scattering (SAXS), nucleosome binding ATPase assay, remodeling assay, limited proteolysis, cross-linking and tandem mass spectrometry\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple biochemical and structural methods in single study (SAXS, ATPase assay, remodeling assay, limited proteolysis, cross-linking MS)\",\n      \"pmids\": [\"22575888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CHD4 PHD, chromo, and helicase domains regulate ATPase activity through intramolecular allostery; DNA binding, histone binding, and ATPase activities are functionally interdependent.\",\n      \"method\": \"Domain deletion constructs, ATPase assay, DNA/histone binding assay, SAXS molecular shape reconstruction\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assays with domain constructs plus structural data, single lab\",\n      \"pmids\": [\"22749909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ATM kinase phosphorylates CHD4 in response to ionizing radiation, and this phosphorylation promotes increased chromatin binding/retention and assembly of CHD4 foci at DNA damage sites; phospho-mutant CHD4 (non-phosphorylatable by ATM) fails to show enhanced chromatin retention and causes high rates of spontaneous DNA damage.\",\n      \"method\": \"Immunofluorescence, chromatin fractionation, phosphorylation assay, overexpression of phospho-mutant, cell survival analysis\",\n      \"journal\": \"Genome integrity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-mutant functional rescue approach plus chromatin fractionation, single lab\",\n      \"pmids\": [\"21219611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CHD4 is a BRIT1 (MCPH1) binding partner required for BRIT1 recruitment to DNA damage lesions; BRIT1's BRCT domains mediate interaction with CHD4. CHD4 ATPase-dead mutant impairs BRIT1 recruitment. CHD4 deficiency impairs BRCA1 recruitment and HR repair efficiency, and sensitizes cells to PARP inhibitors.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, laser micro-irradiation, siRNA knockdown, HR reporter assay, PARP inhibitor sensitivity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, ATPase-dead mutant, functional HR assay, single lab\",\n      \"pmids\": [\"22219182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAB2 transcriptional repression requires interaction with the CHD4 subunit of NuRD through a specific NAB2 repression domain; both NAB proteins can bind CHD3 or CHD4; CHD4 is required for NAB2-mediated repression of the endogenous Rad gene and co-localizes with NAB2 on the Rad promoter in myelinating Schwann cells; the NAB2-CHD4 interaction is regulated by alternative splicing.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion analysis, ChIP, reporter gene assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ChIP, reporter assay, endogenous gene repression, single lab\",\n      \"pmids\": [\"16574654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The N-terminal region of CHD4 contains a stable HMG box-like domain (CHD4-N) that binds poly(ADP-ribose) with higher affinity than DNA; the full N-terminal region (but not CHD4-N alone) is essential for full nucleosome remodeling activity and for localizing CHD4 to DNA damage sites.\",\n      \"method\": \"X-ray crystallography (structure determination), poly(ADP-ribose) binding assays, DNA binding assays, remodeling assay, laser micro-irradiation localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus in vitro binding assays and functional remodeling assay, single lab with multiple methods\",\n      \"pmids\": [\"26565020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHD4 is a peripheral (not central hub) component of the NuRD complex; a NuRD sub-complex lacking CHD4 retains HDAC activity as a stable species; addition of recombinant CHD4 to this nucleosome deacetylase complex reconstitutes NuRD with nucleosome remodeling activity.\",\n      \"method\": \"Biochemical reconstitution, HDAC activity assay, nucleosome remodeling assay, Co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with enzymatic activity assays, single lab, rigorous biochemical evidence\",\n      \"pmids\": [\"27235397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PAPAS lncRNA tethers to rDNA enhancer via DNA-RNA triplex and recruits CHD4/NuRD through direct interaction between the N-terminal part of CHD4 and an unstructured A-rich region in PAPAS; heat stress-dependent dephosphorylation of CHD4 at three serine residues enhances CHD4/NuRD-RNA interaction and reinforces rDNA transcription repression.\",\n      \"method\": \"RNA-protein interaction assays, RNA secondary structure mapping, DNA-RNA triplex assay, phosphorylation analysis, deletion/mutation analysis, ChIP\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (triplex assay, protein-RNA interaction, phosphorylation mapping, mutagenesis, ChIP), single lab\",\n      \"pmids\": [\"29907651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CHD3 and CHD4 form distinct, isoform-specific NuRD complexes (monomeric ATPase each); both exhibit similar intranuclear mobility and accumulate at UV-induced DNA repair sites; CHD3 and CHD4 differ in nuclear localization patterns, target genes, and nucleosome remodeling/positioning behavior in vitro.\",\n      \"method\": \"Co-immunoprecipitation, FRAP (fluorescence recovery after photobleaching), in vitro nucleosome remodeling assay, transcriptomic analysis, live-cell imaging\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, FRAP, in vitro remodeling assay, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"28977666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHD4 interacts with ADNP and HP1 to form the stable ChAHP complex; ADNP mediates complex assembly and recognizes DNA motifs specifying ChAHP binding to euchromatin; ChAHP represses lineage-specific genes by establishing inaccessible chromatin in a locally restricted, H3K9me3-independent manner.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ATAC-seq, ChIP-seq, genetic ablation in mouse ES cells\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP/MS complex identification, genome-wide chromatin accessibility, genetic loss-of-function with distinct phenotypic readout, multiple orthogonal methods\",\n      \"pmids\": [\"29795351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CHD4 is a RanGTP-dependent microtubule-associated protein (MAP) that stabilizes microtubules during mitosis independently of its chromatin remodeling activity; CHD4 binds MTs via its NLS-containing chromatin-binding region, partially localizes to the spindle in mitosis, and its depletion prevents spindle assembly and causes chromosome missegregation.\",\n      \"method\": \"Xenopus egg extract immunodepletion, RNAi in HeLa and Drosophila S2 cells, live-cell imaging, MT binding assay, spindle assembly assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunodepletion in cell-free system plus RNAi in two cell lines, MT binding assay, defined phenotypic readout; multiple model systems\",\n      \"pmids\": [\"24268414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CHD4 (Chd4) physically interacts with the PcG protein Ezh2 and is required specifically for PcG-mediated suppression of the GFAP astrogenic marker gene; in vivo depletion of Chd4 in the developing neocortex promotes astrogenesis.\",\n      \"method\": \"Co-immunoprecipitation, in vivo Chd4 knockdown, immunofluorescence, gene expression analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus in vivo knockdown with defined cellular phenotype, single lab\",\n      \"pmids\": [\"23624931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GATA3 forms functionally distinct complexes with CHD4: a GATA3/CHD4/p300 transcriptional activation complex at Th2 cytokine loci and a GATA3/CHD4-NuRD repression complex at the Tbx21 locus in Th2 cells; CHD4 is required for Th2-dependent inflammation in vivo.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, reporter assay, in vivo asthma 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 — Co-IP, ChIP, functional knockdown with specific phenotypic readout in vitro and in vivo, single lab\",\n      \"pmids\": [\"23471993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CHD4-containing NuRD complexes directly bind the promoters of uPAR and thrombospondin-1 in endothelial cells to repress uPAR and activate Thbs1, preventing excessive ECM proteolysis; loss of endothelial CHD4 leads to elevated plasmin activity and vascular rupture at midgestation.\",\n      \"method\": \"ChIP, conditional knockout mouse model, in vivo and ex vivo vascular analysis, qPCR arrays, genetic rescue (uPA reduction)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP at specific promoters, conditional KO with defined molecular and physiological phenotype, genetic rescue experiment\",\n      \"pmids\": [\"24348274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ZFHX4 interacts with CHD4, a core member of the NuRD complex, in glioblastoma tumor-initiating cells; ZFHX4 and CHD4 bind overlapping genomic loci and control similar gene expression programs; ZFHX4 functions as a master regulator of CHD4 activity.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, gene expression analysis, siRNA knockdown, intracranial xenograft\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP-seq, functional knockdown, single lab\",\n      \"pmids\": [\"24440720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"p300 physically interacts with CHD4 at DNA damage sites (dependent on CHD4's chromodomain and ATPase/helicase domain, and p300's CH2, Bd, and HAT domains); they are co-recruited to DSBs and cooperatively promote homologous recombination repair by facilitating RPA recruitment.\",\n      \"method\": \"Immunoprecipitation, purified protein pulldown, immunofluorescence, DR-GFP/EJ5-GFP reporter systems, siRNA knockdown\",\n      \"journal\": \"Mutagenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus purified protein pulldown with domain mapping, functional HR assay, single lab\",\n      \"pmids\": [\"26546801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHD4 interacts with PAX3-FOXO1 oncogenic fusion protein via short DNA fragments and co-occupies regulatory regions of PAX3-FOXO1 target genes; CHD4 is an essential coregulator of PAX3-FOXO1 activity required for a subset of target gene expression and for alveolar rhabdomyosarcoma cell viability.\",\n      \"method\": \"Interactome screen, Co-immunoprecipitation, ChIP-seq, siRNA knockdown, gene expression analysis, in vivo xenograft\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP-seq co-occupancy, functional knockdown with specific phenotype in vitro and in vivo, single lab\",\n      \"pmids\": [\"27760049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CHD4 recruits repressive chromatin proteins including DNA methyltransferases to sites of oxidative DNA damage (8-OHdG), promoting de novo DNA methylation and epigenetic silencing of tumor suppressor genes; CHD4 is recruited by OGG1 for oxidative damage and by ZMYND8 for double-strand breaks.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, DNA methylation assays, siRNA knockdown, cell invasion/metastasis assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, functional methylation assay, multiple partners identified, single lab\",\n      \"pmids\": [\"28486105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of CHD4 in the heart triggers aberrant expression of the skeletal muscle gene program; loss of CHD4 in skeletal muscle causes inappropriate cardiac gene expression; in both tissues, mitochondrial function depends on CHD4/NuRD, demonstrating CHD4 maintains striated muscle identity.\",\n      \"method\": \"Tissue-specific conditional knockout mouse models, transcriptomic analysis, metabolic profiling, histology\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in two independent tissues with distinct molecular and physiological phenotypes, well-controlled genetic approach\",\n      \"pmids\": [\"27166947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHD4/NuRD directly represses skeletal and smooth muscle myofibril isoforms in the developing heart; CHD4 binds unique sites in smooth muscle myosin heavy chain, fast skeletal α-actin, and fast skeletal troponin complex genes; loss of CHD4 creates hybrid cardiomyocytes with intercalated skeletal and smooth muscle myofibril components disrupting sarcomere formation.\",\n      \"method\": \"Conditional knockout mouse model, transcriptomics, ChIP-seq, histology, cardiac function analysis in utero\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with genome-wide CHD4 occupancy (ChIP-seq) and specific molecular phenotype, multiple orthogonal approaches\",\n      \"pmids\": [\"29891665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHD4 is recruited to DNA breaks by poly(ADP-ribosyl)ation (PAR)-dependent mechanism, but not through direct PAR binding; CHD4 plays an active role in chromatin remodeling at DNA breaks as part of a two-step mechanism where initial PAR-dependent relaxation (by PARP1/ALC1) promotes CHD4 recruitment for further remodeling.\",\n      \"method\": \"Live-cell fluorescence three-hybrid assay, laser micro-irradiation, siRNA knockdown, chromatin relaxation assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell assay establishing mechanism of recruitment, functional chromatin relaxation readout, single lab\",\n      \"pmids\": [\"29733391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CHD4 depletion specifically reduces CHD4 levels (~60%) and derepresses fetal hemoglobin genes in erythroid cells; ZNF410 directly and uniquely activates CHD4 transcription through two evolutionarily conserved clusters of binding sites near the CHD4 gene, and this is the primary mechanism by which ZNF410 controls fetal globin repression.\",\n      \"method\": \"CRISPR-Cas9 genetic screen, in vitro DNA binding assays, crystallography (ZNF410-DNA structure), xenotransplantation, ChIP-seq\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of upstream regulator plus CRISPR screen, xenotransplantation, ChIP-seq; mechanistically complete pathway from ZNF410 → CHD4 → HbF repression\",\n      \"pmids\": [\"33301730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of CHD4 engaged with a nucleosome at 3.1 Å resolution shows the ATPase motor binds and distorts nucleosomal DNA at SHL +2, supporting the 'twist defect' model; CHD4 does not unwrap terminal DNA (unlike Chd1), consistent with its repressive function.\",\n      \"method\": \"Cryo-electron microscopy (cryo-EM) structure determination at 3.1 Å with AMP-PNP\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure of CHD4-nucleosome complex with mechanistic interpretation\",\n      \"pmids\": [\"32543371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Single-molecule assays reveal that CHD4 binding energy alone (without ATP) triggers conformational changes in nucleosomal DNA at the entry side; during remodeling, entry-side DNA enters continuously while exit-side DNA moves in concerted 4–6 bp steps, indicating CHD4 decouples entry- and exit-side DNA translocation through a strain-buildup mechanism.\",\n      \"method\": \"Single-molecule fluorescence assays, optical tweezers, ATPase-dead mutant analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — single-molecule reconstitution with mechanistic dissection of translocation mechanism, multiple quantitative approaches\",\n      \"pmids\": [\"32251276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SIRT6 interacts with CHD4 upon DNA damage and recruits CHD4 to damage sites in an ATM-dependent process; CHD4 displaces HP1 from H3K9me3 at damage sites to promote chromatin relaxation; this SIRT6-CHD4 axis is specifically required for HR in compacted chromatin during G2 phase.\",\n      \"method\": \"Co-immunoprecipitation, laser micro-irradiation, siRNA knockdown, chromatin accessibility assay, HR reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional chromatin relaxation and HR assay, single lab\",\n      \"pmids\": [\"31970415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CHD4 physically interacts with HIF1α and HIF2α subunits and enhances HIF-driven transcription; under normoxia CHD4 enrichment at HIF target gene promoters increases RNA Pol II loading through p300; hypoxia promotes CHD4 chromatin binding via HIF1/2α and CHD4 in turn enhances HIF1α recruitment.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, loss-of-function (siRNA/shRNA), in vivo xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, functional gene expression and in vivo tumor assay, single lab\",\n      \"pmids\": [\"32699137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional knockout of Chd4 in cerebellar granule neurons increases genome-wide chromatin accessibility and promotes cohesin recruitment preferentially to gene enhancers; loss of Chd4 strengthens interactions among developmentally repressed contact domains and genomic loops, correlating with increased enhancer activity and cohesin occupancy.\",\n      \"method\": \"Conditional knockout mouse model, ATAC-seq, Hi-C, ChIP-seq, in vivo profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with genome-wide chromatin accessibility, genome architecture (Hi-C), and ChIP-seq, multiple orthogonal approaches\",\n      \"pmids\": [\"32647123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Chd4 plays a key role in self-antigen expression in medullary thymic epithelial cells (mTECs) by organizing promoter regions of Fezf2-dependent genes and contributing to Aire-mediated self-antigen induction via super-enhancers; Chd4-deficient mTECs show impaired T cell tolerance and autoimmune phenotypes.\",\n      \"method\": \"Conditional knockout mouse model, gene expression analysis, ChIP-seq, immunophenotyping\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with ChIP-seq mechanistic data plus physiological autoimmune phenotype\",\n      \"pmids\": [\"32601470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CHD4 regulates RAD51 expression transcriptionally in glioblastoma cells, providing a mechanism by which CHD4 promotes DNA damage resistance; CHD4 suppression defects both the DNA damage response and RAD51 expression.\",\n      \"method\": \"siRNA/shRNA knockdown, western blot, immunofluorescence, gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — knockdown with specific molecular readout (RAD51 expression), replicated across multiple GBM lines, single lab\",\n      \"pmids\": [\"30872624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 is recruited to NuRD super-enhancers in rhabdomyosarcoma where it generates chromatin architecture permissive for PAX3-FOXO1 binding; CHD4 depletion removes HDAC2 from chromatin, leading to spread of histone acetylation, and prevents RNA Pol II positioning at promoters, impeding transcription initiation.\",\n      \"method\": \"CRISPR NuRD screen, ChIP-seq, ATAC-seq, siRNA knockdown, gene expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen plus ChIP-seq, ATAC-seq, functional knockout, multiple mechanistic readouts\",\n      \"pmids\": [\"32744500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 is recruited by cardiac transcription factors GATA4, NKX2-5, and TBX5 to specific cardiac loci; CHD4 physically interacts with these factors and co-occupies their target gene regulatory regions to repress noncardiac gene programs; deletion of CHD4-bound silencer elements at Acta1 and Myh11 leads to inappropriate skeletal/smooth muscle gene misexpression in the heart.\",\n      \"method\": \"Mass spectrometry (Co-IP-MS), ChIP-seq, transcriptomics, conditional KO, in vivo silencer deletion\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification of cardiac TF interactions, ChIP-seq co-occupancy, in vivo silencer validation, multiple orthogonal methods\",\n      \"pmids\": [\"35450884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 N-terminal intrinsically disordered region (IDR) promotes remodeling integrity in a composition- but not sequence-dependent manner; the C-terminal region harbors an auto-inhibitory region that contacts the helicase domain; auto-inhibition is relieved by a C-terminal SANT-SLIDE domain that binds substrate DNA.\",\n      \"method\": \"Single-molecule assays, domain deletion/swap constructs, ATPase assay, nucleosome remodeling assay, SAXS\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro single-molecule and biochemical assays with multiple domain constructs, mechanistically rigorous\",\n      \"pmids\": [\"36473839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RNA inhibits CHD4 chromatin binding and nucleosome remodeling activity; CHD4 binds G-rich RNA via two intrinsically disordered regions; RNA competes with nucleosome substrate to inhibit CHD4-mediated nucleosome mobilization; this mechanism is evolutionarily conserved between Drosophila dMi-2 and human CHD4.\",\n      \"method\": \"iCLIP (individual nucleotide resolution CLIP), in vitro RNA binding assay, nucleosome remodeling assay, pharmacological transcription inhibition, RNase digestion\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of RNA inhibition of remodeling, biochemical mechanistic dissection, conserved in two organisms\",\n      \"pmids\": [\"35649367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZNF410 knockout reduces CHD4 levels by ~60% and substantially de-represses fetal hemoglobin genes; ZNF410 regulates fetal globin exclusively through CHD4, and two CHD4 genomic regulatory clusters with 27 combined ZNF410 motifs completely account for ZNF410's effects on fetal globin repression.\",\n      \"method\": \"CRISPR-Cas9 screen, knockout mouse model (Zfp410), xenotransplantation, gene expression analysis, ChIP-seq\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independent replication of ZNF410→CHD4→HbF axis with in vivo mouse model and xenotransplantation, CRISPR screen validation\",\n      \"pmids\": [\"33859416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CHD4 conceals aberrant CTCF-binding sites embedded in H3K9me3-enriched B2 SINE heterochromatin by regulating chromatin accessibility; CHD4 depletion allows aberrant CTCF recruitment within TADs, disrupting local TAD organization; RNA-binding IDRs of CHD4 are required to prevent this aberrant CTCF binding.\",\n      \"method\": \"CHD4 conditional KO/depletion, ATAC-seq, Hi-C, ChIP-seq, domain deletion analysis in mESCs\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide chromatin accessibility, Hi-C, ChIP-seq with domain deletion, single lab\",\n      \"pmids\": [\"34764232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 interacts with SMYD1, a striated muscle-restricted histone methyltransferase, in cardiac tissue; CHD4 and SMYD1 co-repress a group of common genes and pathways including glycolysis, response to hypoxia, and angiogenesis in the developing heart.\",\n      \"method\": \"Quantitative proteomics (Co-IP-MS), transcriptomics, ATAC-seq, conditional KO mouse hearts\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics identifies interaction, transcriptomic and chromatin accessibility data from KO, single lab\",\n      \"pmids\": [\"38619323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A de novo CHD4 missense mutation (M202I/M195I in mice) causes augmented affinity of CHD4 protein for endocardial BRG1; this enhanced CHD4M195I-BRG1 interaction prevents derepression of Adamts1 transcription, reducing ADAMTS1-mediated trabeculation termination and causing biventricular hypertrabeculation; administration of ADAMTS1 rescues hypertrabeculation defects.\",\n      \"method\": \"Humanized mouse model, Co-IP with MS, ChIP, transcriptomics, genetic rescue (ADAMTS1 administration), echocardiography\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — humanized mouse model with Co-IP-MS, ChIP, transcriptomics, and genetic rescue experiment, mechanistically complete\",\n      \"pmids\": [\"37254794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 depletion in Ewing sarcoma leads to global increase in DNA accessibility and induction of spontaneous DNA damage, increasing susceptibility to DNA-damaging agents; CHD4 and NuRD co-localize with EWS-FLI1 at enhancers/super-enhancers but CHD4 promotes cell survival through chromatin structure regulation rather than modulating EWS-FLI1 activity.\",\n      \"method\": \"CRISPR/Cas9 inactivation screen, ATAC-seq, ChIP-seq, siRNA knockdown, in vivo xenograft, PARP inhibitor combination\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR screen, ATAC-seq, ChIP-seq, functional in vivo model, single lab\",\n      \"pmids\": [\"37963210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CHD4 acts as a chromatin proof-reading enzyme by promoting nucleosome positioning over GATA3 binding motifs to compete with transcription factor-DNA interaction; CHD4 depletion leads to redistribution of transcription factors to previously unoccupied sites and prevents appropriate chromatin opening during GATA3-induced reprogramming.\",\n      \"method\": \"ATAC-seq, ChIP-seq, siRNA knockdown, cellular reprogramming assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide chromatin accessibility and TF occupancy assays with functional reprogramming readout, single lab\",\n      \"pmids\": [\"38281186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHD4 represses Wnt signaling in vascular endothelial cells; endothelial deletion of Chd4 upregulates Wnt-responsive transcription factor Tcf7 and Wnt target genes including Pitx2; BRG1 and CHD4 antagonistically modulate Wnt signaling in developing yolk sac vessels.\",\n      \"method\": \"Conditional knockout mouse models (single and double KO), gene expression analysis, Wnt target gene analysis, pharmacological rescue (LiCl)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific molecular readout (Wnt targets), double KO epistasis, pharmacological rescue, single lab\",\n      \"pmids\": [\"22290435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CHD4/NuRD directly binds the promoter of rDNA transcription silencer TIP5 and negatively regulates TIP5 expression, thereby inhibiting rDNA methylation and maintaining demethylated state of rDNA promoters; CHD4/NuRD controls rDNA methylation status through cross-talk with the NoRC complex.\",\n      \"method\": \"ChIP, siRNA knockdown, DNA methylation analysis, gene expression analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at specific promoter, functional knockdown with methylation readout, single lab\",\n      \"pmids\": [\"23796711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In Xenopus, CHD4/Mi-2beta controls the neuroectoderm/mesoderm boundary by suppressing Sip1 transcription through direct binding to the 5' end of the Sip1 gene body; CHD4/Sip1 epistasis determines the ON threshold for Nodal-dependent Xbra transcription.\",\n      \"method\": \"Gain and loss of CHD4 function in Xenopus embryos, ChIP, epistasis analysis, gene expression analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstration of direct Sip1 binding plus genetic epistasis in whole organism, mechanistically complete pathway\",\n      \"pmids\": [\"17438000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNA damage increases N6-methyladenosine (m6A) marks on the lncRNA NEAT1, promoting its accumulation at promoter-associated DSBs; NEAT1 releases CHD4 from NEAT1 at DSBs to fine-tune histone acetylation; this genome-protective role of NEAT1 requires the RNA methyltransferase METTL3 and involves CHD4 release from NEAT1 to regulate chromatin at damage sites.\",\n      \"method\": \"m6A RNA modification analysis, m6A-seq, NEAT1 depletion, siRNA knockdown, DSB focus formation assay, histone acetylation analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA modification analysis, loss-of-function with specific chromatin acetylation readout, single lab\",\n      \"pmids\": [\"39362776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Chd4 acts as a corepressor of Sox9 during BMP-2-induced chondrogenesis; Chd4 interacts with Hdac1/2, Kap1, and Cbx1 and binds at the Sox9 promoter (-207/-148 region); let-7a miRNA targets the 3'UTR of Chd4 to promote chondrogenesis.\",\n      \"method\": \"ChIP, nuclease hypersensitivity assay, Co-IP (inferred from NuRD complex), siRNA knockdown, proteomics\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct Sox9 promoter binding, nuclease hypersensitivity, functional knockdown, single lab\",\n      \"pmids\": [\"23519980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 interacts with the transcription factor Znf219 in cardiac tissue; Znf219 represses skeletal muscle sarcomeric genes in cardiomyocytes; aberrant expression of skeletal muscle sarcomere proteins in Znf219 knockdown mouse hearts leads to arrhythmias with increased PR interval.\",\n      \"method\": \"Co-immunoprecipitation, in vitro/in vivo knockdown, cardiac phenotyping, gene expression analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction plus in vivo knockdown with defined arrhythmic phenotype, single lab\",\n      \"pmids\": [\"36076959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FBXW7 degrades CHD4 protein via ubiquitination; CHD4 promotes nuclear translocation of β-catenin to activate the Wnt/β-catenin pathway; the FBXW7-CHD4-Wnt/β-catenin axis regulates cancer stem cell maintenance in triple-negative breast cancer.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry, ubiquitination assay, Co-IP, western blot, functional assays (sphere formation, invasion), in vivo xenograft\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS identifies substrate, ubiquitination assay confirms degradation, functional pathway validation, single lab\",\n      \"pmids\": [\"38268032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CHD4/NuRD directly activates transcription of PLS3 (Plastin 3) by binding the PLS3 promoter in an activating manner; CHD4/NuRD activity at the PLS3 promoter is demonstrated by ChIP and dual-luciferase assays; CHD4 expression is co-regulated with PLS3 and DXZ4 macrosatellite copy number.\",\n      \"method\": \"siRNA knockdown, CHD4 overexpression, ChIP, dual-luciferase promoter assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating promoter binding plus functional luciferase assay, single lab\",\n      \"pmids\": [\"36812914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CHD4 directly binds the Ripk3 promoter in hypoxic endothelial cells to repress Ripk3 transcription and prevent histone acetylation at that promoter; genetic deletion of Chd4 upregulates Ripk3, and concomitant deletion of Ripk3 partially rescues vascular rupture and lethality in Chd4 mutants.\",\n      \"method\": \"Conditional knockout mouse model, ChIP, histone acetylation analysis, genetic epistasis (Chd4/Ripk3 double KO)\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating promoter binding, genetic epistasis with partial rescue, conditional KO with mechanistic molecular readout, single lab\",\n      \"pmids\": [\"31235857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CHD4 interacts with the GDNF-responsive transcription factor SALL4 in spermatogonia (independent of NuRD) to regulate gene expression controlling spermatogonial stem cell fate decisions; CHD4 loss significantly impairs SSC regenerative capacity with ~50% reduction in colonization.\",\n      \"method\": \"Co-immunoprecipitation, spermatogonial transplantation, scRNA-seq, siRNA knockdown\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifies SALL4 interaction, functional transplantation assay with scRNA-seq, single lab\",\n      \"pmids\": [\"33961790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CHD4 directly binds the proximal promoter of Ucp1 and represses thermogenic gene expression in adipocytes; harmine treatment activates the RAC1-MEK-ERK pathway which triggers CHD4 displacement from the Ucp1 promoter through ERK-mediated post-translational modification of CHD4.\",\n      \"method\": \"ChIP, post-translational modification analysis, siRNA knockdown, pharmacological treatment, reporter assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct Ucp1 promoter binding, pathway inhibition experiments, single lab\",\n      \"pmids\": [\"27805061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CHD4 loss in mature B cells impairs class switch recombination by reducing AID (activation-induced cytidine deaminase) targeting to the Igh locus; CHD4 directly binds H3K9me3 at the Igh locus and is required for optimal AID recruitment; CHD4 also represses p53 to promote B cell proliferation.\",\n      \"method\": \"Conditional knockout mouse model, ChIP (H3K9me3), flow cytometry (CSR assay), gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific molecular mechanism (H3K9me3 binding, AID recruitment, p53 repression), single lab\",\n      \"pmids\": [\"31042474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 promotes the interaction between ERK1/2 and MEK1/2, resulting in continuous activation of the MEK/ERK pathway; CHD4 mediates drug efflux to reduce intracellular cisplatin concentration; CHD4 physically interacts with ERK1/2 and MEK1/2 in gastric cancer cells.\",\n      \"method\": \"Immunoprecipitation, proximity ligation assay, LC-MS, western blot, drug sensitivity assay, xenograft\",\n      \"journal\": \"Drug resistance updates\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP plus proximity ligation, single lab, mechanistic claims of CHD4-ERK/MEK interaction without in vitro reconstitution\",\n      \"pmids\": [\"36603431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CHD4 mutations R975H and R1162W reduce CHD4 protein stability, phenocopying CHD4 depletion to increase cancer stem cell marker CD133 expression; mutant CHD4 activates TGFβ signaling to promote stemness; mutant CHD4 does not impair NuRD complex formation.\",\n      \"method\": \"Genetic engineering, Co-IP (NuRD complex), western blot (protein stability), sphere formation, in vivo tumorigenicity, TGFβ inhibitor treatment\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirms NuRD complex integrity, protein stability assay, pathway inhibitor rescue, single lab\",\n      \"pmids\": [\"29888111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CHD4 mediates SOX2 transcriptional repression by binding the SOX2 promoter in a TRPS1-dependent manner; CHD4 requires TRPS1 for promoter occupancy, and TRPS1 abolishes CHD4-mediated transcriptional activation of SOX2 in luminal breast cancer.\",\n      \"method\": \"ChIP, Co-IP, siRNA knockdown, reporter assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP plus Co-IP in single lab, no mutagenesis or reconstitution\",\n      \"pmids\": [\"36075559\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CHD4 is the catalytic ATPase core of the NuRD (nucleosome remodeling and deacetylase) complex and also operates in NuRD-independent contexts; it slides nucleosomes by decoupling continuous entry-side DNA translocation from concerted 4–6 bp exit-side steps (twist-defect mechanism, confirmed by single-molecule assays and cryo-EM), with its activity allosterically regulated by intramolecular domain communication involving its tandem PHD fingers (which bivalently recognize H3 N-terminal tails with preference for unmodified H3K4 and methylated/acetylated H3K9), chromodomains, and newly characterized IDR and SANT-SLIDE auto-inhibitory C-terminal regions; in the DDR, CHD4 is recruited to DSBs by poly(ADP-ribosyl)ation and is phosphorylated by ATM, where it facilitates chromatin relaxation, promotes RNF168/BRCA1 assembly, and enables homologous recombination; it also stabilizes microtubules as a RanGTP-dependent MAP to support bipolar spindle formation; in transcriptional regulation it is directed to specific genomic loci by transcription factors (GATA4, NKX2-5, GATA3, ZNF410, ADNP/HP1 in ChAHP) and by lncRNAs (PAPAS via RNA-triplex), where it represses noncardiac, non-B-cell, and fetal globin gene programs and also acts as a co-activator of HIF-mediated transcription; RNA binding to CHD4 intrinsically disordered regions inhibits its chromatin association and remodeling activity, providing a transcription-coupled brake on repressive remodeling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CHD4 is an ATP-dependent chromatin remodeling ATPase that serves as the catalytic engine of the NuRD nucleosome remodeling and deacetylase complex, where it is a peripheral subunit whose addition to a stable HDAC-containing core reconstitutes nucleosome remodeling activity [#13]. Mechanistically, CHD4 slides nucleosomes by distorting DNA at the SHL +2 position without unwrapping terminal DNA, a feature consistent with its repressive role [#29], and it decouples continuous entry-side DNA translocation from concerted 4\\u20136 bp exit-side steps via a strain-buildup (twist-defect) mechanism [#30]. Its activity is governed by intramolecular allostery among its tandem PHD fingers, chromodomains, helicase, and C-terminal regions [#7, #38]: the PHD fingers bivalently engage two histone H3 N-terminal tails with preference for unmodified H3K4 and methylated/acetylated H3K9, an interaction required for repression and for displacing HP1\\u03b3 from H3K9me3-marked chromatin [#3, #5], while an N-terminal IDR supports remodeling integrity and a C-terminal auto-inhibitory region is relieved by SANT-SLIDE DNA binding [#38]. CHD4 is targeted to specific loci by transcription factors\\u2014including cardiac GATA4/NKX2-5/TBX5 to repress noncardiac myofibril programs [#37, #26], GATA3 in T cells [#19], and ADNP/HP1 in the ChAHP complex [#16]\\u2014and by lncRNAs such as PAPAS via DNA-RNA triplex tethering [#14]. In the DNA damage response, CHD4 is recruited to double-strand breaks in a poly(ADP-ribosyl)ation-dependent manner [#0, #27], is phosphorylated by ATM [#9], and promotes RNF168/BRCA1 chromatin assembly, chromatin relaxation, and homologous recombination [#1, #31]. CHD4 also functions independently of chromatin as a RanGTP-dependent microtubule-associated protein that stabilizes the mitotic spindle [#17]. Globally, it represses lineage-inappropriate gene programs, restricts chromatin accessibility, and controls genome architecture by limiting aberrant cohesin and CTCF occupancy [#33, #41], and RNA binding to its intrinsically disordered regions provides a transcription-coupled brake on its remodeling activity [#39]. A de novo CHD4 missense mutation that augments its affinity for endocardial BRG1 causes biventricular hypertrabeculation through ADAMTS1 misregulation [#43].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that CHD4 physically links a chromatin deacetylase/remodeling complex to DNA-damage checkpoint signaling, anchoring it within the NuRD complex.\",\n      \"evidence\": \"Biochemical co-purification, mass spectrometry, and Co-IP showing CHD4 associates with ATR, HDAC1/2, and MTA proteins\",\n      \"pmids\": [\"10545197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish whether the ATR association is direct or NuRD-mediated\", \"No functional consequence of the CHD4-ATR link demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the histone-mark code read by CHD4's PHD2 finger, explaining how CHD4 is recruited to and discriminates among modified nucleosomes.\",\n      \"evidence\": \"Fluorescence/NMR binding assays, peptide library screen, and mutagenesis quantifying PHD2-H3 tail affinities\",\n      \"pmids\": [\"19624289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding measured on peptides, not nucleosomes\", \"Did not address how mark reading is coupled to ATPase activity\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated CHD4's direct role in the DNA damage response, showing PAR-dependent recruitment, ATM phosphorylation, and control of RNF168/BRCA1 assembly and the G1/S transition.\",\n      \"evidence\": \"Two independent studies using laser micro-irradiation, kinase assays, MS screens, immunofluorescence, FRAP, and clonogenic survival\",\n      \"pmids\": [\"20693977\", \"20805324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether PAR recruitment is direct binding or indirect\", \"Mechanism linking remodeling activity to RNF168/BRCA1 loading not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed that CHD4's PHD, chromo, and helicase domains communicate allosterically to regulate ATPase and remodeling activity, and that multivalent dual-H3-tail engagement underlies NuRD repression and HP1\\u03b3 displacement.\",\n      \"evidence\": \"SAXS, cross-linking MS, limited proteolysis, ATPase/remodeling assays, NMR, and chromatin immunofluorescence across multiple studies\",\n      \"pmids\": [\"22575888\", \"22749909\", \"22215588\", \"23071088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of the full multidomain protein on a nucleosome\", \"How transcription-factor recruitment intersects with allosteric regulation unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed a chromatin-independent function: CHD4 acts as a RanGTP-dependent microtubule-associated protein required for bipolar spindle assembly.\",\n      \"evidence\": \"Xenopus egg extract immunodepletion, RNAi in HeLa and S2 cells, MT-binding and spindle assembly assays\",\n      \"pmids\": [\"24268414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of MT binding not defined\", \"Relationship between spindle role and NuRD function unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Positioned CHD4 as a peripheral, exchangeable catalytic subunit of NuRD whose recruitment confers remodeling onto a stable deacetylase core.\",\n      \"evidence\": \"Biochemical reconstitution with HDAC and nucleosome remodeling activity assays\",\n      \"pmids\": [\"27235397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of CHD4 exchange in vivo not addressed\", \"Whether peripheral architecture differs across NuRD subtypes unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified CHD4 as the master genomic effector through which transcription factors and lncRNAs enforce lineage-specific repression, including ZNF410-driven CHD4 expression controlling fetal globin and ADNP-directed ChAHP repression.\",\n      \"evidence\": \"CRISPR screens, ChIP-seq, ATAC-seq, crystallography of ZNF410-DNA, RNA-triplex and protein-RNA interaction assays, conditional knockouts across multiple tissues\",\n      \"pmids\": [\"29795351\", \"29907651\", \"33301730\", \"27166947\", \"29891665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How distinct recruiters compete for a limited CHD4 pool not resolved\", \"Whether repression at all loci requires catalytic remodeling or only occupancy unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided the mechanistic basis of CHD4 remodeling, showing it distorts DNA at SHL +2 without unwrapping terminal DNA and decouples entry- and exit-side translocation through strain buildup.\",\n      \"evidence\": \"Cryo-EM at 3.1 \\u00c5 with AMP-PNP and single-molecule fluorescence/optical tweezer assays with ATPase-dead mutants\",\n      \"pmids\": [\"32543371\", \"32251276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures lack the regulatory N- and C-terminal domains in context\", \"How allosteric inputs modulate the twist-defect step not visualized\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined autoregulatory and RNA-mediated brakes on CHD4: a C-terminal auto-inhibitory region relieved by SANT-SLIDE DNA binding, and a conserved RNA-IDR interaction that competes with nucleosome substrate to inhibit remodeling.\",\n      \"evidence\": \"Single-molecule and ATPase/remodeling assays with domain constructs, SAXS, and iCLIP with in vitro RNA competition assays\",\n      \"pmids\": [\"36473839\", \"35649367\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of RNA inhibition during transcription not quantified\", \"How IDR composition tunes activity at specific loci unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked a de novo CHD4 missense mutation to a developmental phenotype, showing gain of BRG1 affinity disrupts cardiac trabeculation termination via ADAMTS1.\",\n      \"evidence\": \"Humanized mouse model with Co-IP-MS, ChIP, transcriptomics, and ADAMTS1 genetic rescue\",\n      \"pmids\": [\"37254794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the gain-of-function mechanism generalizes to other CHD4 patient mutations unknown\", \"Structural basis of enhanced BRG1 binding not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended CHD4's role to genome surveillance and proof-reading, positioning nucleosomes over transcription-factor motifs and being released from damage-associated lncRNAs to fine-tune chromatin.\",\n      \"evidence\": \"ATAC-seq, ChIP-seq, reprogramming assays, and m6A-seq with NEAT1 depletion\",\n      \"pmids\": [\"38281186\", \"39362776\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical demonstration of competitive nucleosome positioning at TF motifs lacking\", \"Generality of lncRNA-mediated CHD4 release across damage contexts unestablished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many competing recruiters (sequence-specific TFs, lncRNAs, DDR signals, and inhibitory RNAs) are integrated to direct a limited cellular CHD4 pool to the correct loci at the correct time remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No quantitative model partitioning CHD4 among NuRD, ChAHP, and NuRD-independent pools\", \"Structural picture of full-length CHD4 with regulatory domains engaged on a nucleosome lacking\", \"Rules governing activation versus repression at TF-recruited loci undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [29, 30, 38]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [29, 30, 13]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [3, 4, 5]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8, 12, 30]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [39, 14, 49]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [6, 37, 16]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 15, 16]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 1, 30]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [13, 16, 33]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 37, 28]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 1, 31]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [26, 37, 48]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [17, 0]}\n    ],\n    \"complexes\": [\"NuRD\", \"ChAHP\"],\n    \"partners\": [\"HDAC2\", \"MTA1\", \"ADNP\", \"GATA3\", \"GATA4\", \"BRG1\", \"HP1\", \"ZNF410\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}