{"gene":"PHF6","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":2002,"finding":"PHF6 localizes diffusely to the nucleus with prominent nucleolar accumulation, as shown by transient transfection of GFP-tagged PHF6, suggesting a role in transcription.","method":"Transient transfection with GFP-tagged PHF6, fluorescence microscopy","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 — single localization experiment, no functional follow-up in same paper","pmids":["12415272"],"is_preprint":false},{"year":2012,"finding":"PHF6 physically associates with multiple components of the NuRD (nucleosome remodeling and deacetylation) complex, including CHD4, HDAC1, and RBBP4; this PHF6-NuRD interaction is restricted to the nucleoplasm and is not present in the nucleolus.","method":"Flag-tagged PHF6 co-immunoprecipitation from HEK 293T cells followed by mass spectrometry; subcellular fractionation","journal":"Journal of proteome research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with MS identification, replicated by subsequent structural study","pmids":["22720776"],"is_preprint":false},{"year":2012,"finding":"PHF6 localizes to the nucleolus and to ribosomal DNA (rDNA) promoter regions, directly interacts with upstream binding factor (UBF) through its PHD1 domain, and suppresses ribosomal RNA (rRNA) transcription by affecting UBF protein levels; PHF6 knockdown causes G2/M arrest and accumulation of DNA damage at the rDNA locus, reversible by knocking down UBF or overexpressing RNase I.","method":"ChIP, Co-IP, siRNA knockdown, cell cycle analysis, γH2AX measurement, RNase I rescue experiment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in single study including domain-specific interaction and functional rescue","pmids":["23229552"],"is_preprint":false},{"year":2013,"finding":"PHF6 physically associates with the PAF1 transcription elongation complex, and knockdown of PHF6 profoundly impairs neuronal migration in the mouse cerebral cortex in vivo, forming white matter heterotopias with neuronal hyperexcitability; inhibition of PAF1 phenocopies this migration defect, and PHF6/PAF1 regulate the downstream target NGC/CSPG5.","method":"Co-IP, in utero electroporation knockdown in mouse cortex, live imaging, electrophysiology","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus in vivo KD with defined cellular phenotype and epistasis to PAF1","pmids":["23791194"],"is_preprint":false},{"year":2014,"finding":"Crystal structure of the PHF6 ePHD2 domain (comprising an N-terminal pre-PHD C2HC zinc finger, a linker, and an atypical PHD finger) reveals it as a novel integrated structural module; ePHD2 binds dsDNA but not histones; PHF6 directly interacts with RBBP4 (a NuRD component) and exerts transcriptional repression activity through this interaction.","method":"X-ray crystallography, in vitro binding assays, GAL4 reporter transcriptional repression assay, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional validation and mutagenesis in same study","pmids":["24554700"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of the RBBP4–PHF6 peptide complex (residues 162–170) shows that PHF6 binds the top surface of the RBBP4 β-propeller via a pair of positively charged residues inserting into a negatively charged pocket; corresponding PHF6 mutants impair this interaction in vitro and in vivo; the PHF6 middle disordered region (residues 145–207) is sufficient for transcriptional repression mediated through RBBP4 recruitment, and RBBP4 knockdown diminishes PHF6-mediated repression.","method":"X-ray crystallography, mutagenesis, in vitro binding assay, GAL4 reporter assay, RBBP4 knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure of complex plus mutagenesis and functional validation","pmids":["25601084"],"is_preprint":false},{"year":2015,"finding":"miR-128 directly targets PHF6 mRNA; restoring PHF6 expression counteracts the deleterious effect of miR-128 on neuronal migration, dendritic outgrowth, and intrinsic physiological properties in vivo, placing miR-128 upstream of PHF6 in cortical lamination and neuronal development.","method":"miRNA sponge experiments, rescue overexpression of PHF6, in utero electroporation, electrophysiology","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — in vivo rescue experiment with clear epistasis, multiple readouts","pmids":["25556700"],"is_preprint":false},{"year":2016,"finding":"PHF6 localizes to the sub-nucleolar fibrillar center (FC) and dense fibrillar component (DFC) in an RNA-dependent manner; ChIP-qPCR shows PHF6 enrichment across the entire rDNA-coding sequence but not the intergenic spacer; PHF6 gain-of-function decreases overall rRNA transcription and increases repressive pRNA and non-coding IGS36RNA/IGS39RNA levels.","method":"RNase A/DNase I/ActD treatment followed by immunocytochemistry, ChIP-qPCR, rRNA quantification in gain-of-function model","journal":"European journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing sub-nucleolar localization with functional consequence","pmids":["27165002"],"is_preprint":false},{"year":2017,"finding":"Loss of PHF6 in B-cell leukemia causes systematic changes in chromatin accessibility at transcriptional start sites of B-cell- and T-cell-specific factors, down-regulation of B-cell identity genes, up-regulation of T-cell signaling genes, and gives rise to mixed-lineage lymphoma in vivo, indicating PHF6 maintains lineage identity through chromatin landscape maintenance.","method":"ATAC-seq, RNA-seq, CRISPR/Cas9 knockout, in vivo transplantation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genomics methods plus in vivo phenotype, single lab but rigorous","pmids":["28607179"],"is_preprint":false},{"year":2019,"finding":"PHF6 is rapidly recruited to sites of DNA lesions in a PARP-dependent manner; loss of PHF6 dramatically compromises G2 checkpoint recovery and impairs DNA repair through classical non-homologous end joining (NHEJ).","method":"RNAi screen, live-cell imaging of PHF6 recruitment to laser-induced damage, PARP inhibitor treatment, NHEJ reporter assay, checkpoint recovery assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — direct localization to damage sites with mechanistic link to NHEJ repair, multiple methods","pmids":["31782600"],"is_preprint":false},{"year":2019,"finding":"PHF6 acts as a transcriptional repressor in AgRP neurons, binding promoters of immediate-early genes (IEGs); PHF6 chromatin binding is dynamically regulated by hunger state; loss of PHF6 shifts the transcriptional profile to a hunger-state-like pattern in satiated mice and impairs hunger-driven feeding behavior.","method":"Cell-type-specific ChIP, RNA-seq in AgRP neurons, conditional KO, behavioral assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific ChIP plus conditional KO with defined behavioral and transcriptional readout","pmids":["32187544"],"is_preprint":false},{"year":2019,"finding":"Phf6 deficiency in hematopoietic stem cells (HSCs) represses expression of genes associated with TNFα signaling, conferring resistance to TNFα-mediated growth inhibition and enhancing HSC self-renewal and repopulating capacity.","method":"Conditional Phf6 knockout mouse, competitive repopulation assays, serial transplantation, gene expression analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with epistatic rescue (TNFα pathway), functional assays in vivo","pmids":["30917958"],"is_preprint":false},{"year":2020,"finding":"PHF6 acts as an E3 ubiquitin ligase for ubiquitination of histone H2B at K120 (H2BK120ub) via its extended PHD1 domain; the extended PHD2 domain of PHF6 recognizes acetylation of H2BK12 (H2BK12Ac), and this recognition by ePHD2 is required for PHF6's E3 ubiquitin ligase activity for H2BK120ub, thereby activating trophectodermal genes.","method":"RNA-seq, ChIP assays, in vitro ubiquitination assay, domain deletion/mutagenesis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with domain mutagenesis and ChIP validation","pmids":["32735658"],"is_preprint":false},{"year":2021,"finding":"PHF6 binds H3K9me3 and H3K27me1 on nucleolar chromatin and recruits histone methyltransferase SUV39H1 to rDNA loci; PHF6 loss decreases SUV39H1 recruitment and H3K9me3 levels at rDNA, promoting rDNA transcription; clinical PHF6 mutants impair this interaction.","method":"Co-IP, ChIP, knockdown/overexpression of PHF6 and SUV39H1, xenograft models, patient sample analysis","journal":"Acta pharmaceutica sinica. B","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus ChIP epistasis plus patient validation","pmids":["35847518"],"is_preprint":false},{"year":2021,"finding":"PHF6 represses p21 expression by directly binding to the p21 promoter region and recruiting RBBP4; loss of PHF6 derepresses p21, contributing to prednisolone resistance in T-ALL cells.","method":"ChIP, CRISPR-Cas9 correction of PHF6 point mutation, siRNA knockdown, MTT assay","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus functional rescue, single lab","pmids":["30551478"],"is_preprint":false},{"year":2021,"finding":"PHF6 deficiency promotes JAK3M511I-induced T-ALL progression in mice by inhibiting the Bai1-Mdm2-P53 signaling pathway, independent of JAK3/STAT5 signaling.","method":"Mouse leukemia models, genetic epistasis (PHF6 KO + JAK3M511I), pathway analysis, inhibitor combination in vivo","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — mouse genetic epistasis with pathway dissection, single lab","pmids":["34465864"],"is_preprint":false},{"year":2021,"finding":"DNMT1-mediated gene body methylation at rDNA prevents PHF6 binding to hypomethylated rDNA gene bodies; when gene body methylation is reduced, PHF6 occupancy increases and PHF6 recruits histone methyltransferase SUV4-20H2 to establish H4K20me3, thereby inhibiting rDNA transcription.","method":"MeDIP-seq, bisulfite sequencing, ChIP, immunofluorescence, DNMT1 knockdown/deficiency models","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal epigenomic methods establishing methylation-dependent PHF6 recruitment and functional consequence","pmids":["34520760"],"is_preprint":false},{"year":2022,"finding":"PHF6 engages multiple nucleosome remodeling protein complexes including NuRD, SWI/SNF, and ISWI factors, as well as replication machinery and DNA repair proteins; native ChIP-seq shows PHF6 specifically associates with heterochromatin satellite DNA regions enriched in H3K9me3; PHF6 loss impairs resolution of single- and double-strand DNA breaks.","method":"Proteomics (immunoprecipitation-MS), native ChIP-seq, single-molecule locus-specific analysis, DNA damage assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — MS-based interactome plus ChIP-seq plus functional DNA repair assays, multiple orthogonal methods","pmids":["35338774"],"is_preprint":false},{"year":2023,"finding":"PHF6 physically interacts with NF-κB subunit p50; PHF6 depletion disrupts the PHF6-p50 complex and partially inhibits nuclear translocation of p50, suppressing BCL2 expression and inhibiting AML cell proliferation/survival.","method":"Co-IP, siRNA knockdown, NF-κB inhibitor treatment, apoptosis and proliferation assays","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP plus functional assay, single lab","pmids":["37393343"],"is_preprint":false},{"year":2023,"finding":"PHF6 physically interacts with HIF-1α and HIF-2α to potentiate HIF-driven transcriptional activity; PHF6 recruits BPTF to mediate epigenetic remodeling at HIF target gene loci; HIF double-knockout abolishes PHF6-mediated breast tumor growth.","method":"Co-IP, ChIP-qPCR, CRISPR HIF double-KO, xenograft models","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus ChIP plus genetic epistasis via HIF DKO, single lab","pmids":["36967443"],"is_preprint":false},{"year":2024,"finding":"PHF6 co-localizes with SWI/SNF complexes at promoters and is essential for maintaining active chromatin state at those loci; in SMARCB1-deficient cells, PHF6 loss disrupts the recruitment and stability of residual SWI/SNF complex members, resulting in loss of active chromatin at promoters and stalling of RNA Polymerase II progression.","method":"CRISPR-Cas9 genome-scale screen, ChIP-seq, ATAC-seq, co-IP, RNA Pol II occupancy assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genomic and biochemical methods, clear mechanistic model","pmids":["39181868"],"is_preprint":false},{"year":2024,"finding":"PHF6 directly interacts with RUNX1; both proteins co-localize at active enhancer regions that define lineage differentiation context in myeloid neoplasms.","method":"Proteomics, ChIP-seq co-localization, co-IP","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics plus ChIP co-localization, single study","pmids":["38418452"],"is_preprint":false},{"year":2024,"finding":"PHF6 genome-wide binding in the developing cortex is enriched near genes involved in CNS development and neurogenesis; PHF6 directly promotes transcription of Ephrin receptors (EphRs); PHF6 regulation of EphR is impaired in BFLS mice and conditional Phf6 KO mice; EphR-A knockdown phenocopies PHF6 loss in embryonic neural stem cells (eNSCs) and forced EphR expression rescues BFLS mouse-derived eNSC defects.","method":"Genome-wide ChIP-seq in developing cortex, BFLS knockin mice, conditional KO, in vitro eNSC assays, rescue experiments","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 — ChIP-seq plus genetic epistasis with rescue, multiple models","pmids":["38429579"],"is_preprint":false},{"year":2024,"finding":"PHF6 loss in the developing cortex causes upregulation of genes including Reln, Nr4a2, Slc12a5, Phip, and ZIC transcription factors; Phf6-deficient neural precursor cells show reduced self-renewal and increased neuronal differentiation; Phf6-deficient cortical neurons show premature spontaneous neuronal activity.","method":"Germline and nervous-system-specific Phf6 KO mice, transcriptomic analysis, neurosphere assays, electrophysiology","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with transcriptomic and electrophysiological readouts, multiple models","pmids":["39405291"],"is_preprint":false},{"year":2025,"finding":"PHF6 and PHIP form a functional chromatin complex; PHF6 requires PHIP to occupy chromatin and execute its downstream transcriptional repression program; PHF6 loss expands AML leukemia-initiating cells and upregulates a stemness gene network; PHIP loss phenocopies PHF6 loss.","method":"Co-IP, ChIP-seq, CRISPR/Cas9 KO of PHF6 and PHIP, mouse leukemia models, transcriptomics","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus ChIP-seq plus genetic epistasis with in vivo models","pmids":["40721297"],"is_preprint":false}],"current_model":"PHF6 is a nuclear and nucleolar chromatin-adaptor protein that functions as a transcriptional repressor through multiple mechanisms: it interacts with the NuRD complex (via RBBP4, structurally defined), the PAF1 transcription elongation complex, SWI/SNF and ISWI remodelers, and PHIP (which is required for PHF6 chromatin occupancy); at rDNA loci it suppresses rRNA transcription by recruiting SUV39H1 to establish H3K9me3 and by binding UBF through its PHD1 domain; its ePHD2 domain binds dsDNA and reads H2BK12Ac to direct E3 ubiquitin ligase activity (H2BK120 ubiquitination) via PHD1; it is recruited to DNA double-strand breaks in a PARP-dependent manner and promotes non-homologous end joining; in neurons it drives Ephrin receptor transcription to control neural stem cell self-renewal and neuronal migration; and in hematopoietic stem cells it restrains self-renewal partly through TNFα signaling, collectively explaining its roles as a tumor suppressor in T-ALL/AML and as a developmental regulator whose loss causes Börjeson-Forssman-Lehmann syndrome."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing PHF6 as a nuclear/nucleolar protein set the stage for understanding it as a chromatin-associated factor rather than a cytoplasmic signaling protein.","evidence":"GFP-tagged PHF6 transfection and fluorescence microscopy in cell lines","pmids":["12415272"],"confidence":"Medium","gaps":["No functional consequence of nucleolar localization established","Single overexpression system without endogenous protein confirmation"]},{"year":2012,"claim":"Discovery that PHF6 physically associates with the NuRD complex (CHD4, HDAC1, RBBP4) in the nucleoplasm and separately binds UBF at rDNA to suppress rRNA transcription established PHF6 as a dual-compartment transcriptional repressor with distinct nucleoplasmic and nucleolar functions.","evidence":"Flag-tagged PHF6 Co-IP/MS from HEK293T cells with subcellular fractionation; ChIP at rDNA loci, Co-IP with UBF, siRNA knockdown with cell-cycle and γH2AX readouts","pmids":["22720776","23229552"],"confidence":"High","gaps":["Mechanism by which PHF6 regulates UBF protein levels unknown","Genome-wide target repertoire of PHF6-NuRD not defined"]},{"year":2013,"claim":"Identification of the PHF6–PAF1 complex interaction and the in vivo neuronal migration phenotype upon PHF6 loss revealed PHF6 as a critical regulator of cortical development, linking chromatin regulation to brain lamination.","evidence":"Co-IP plus in utero electroporation knockdown in mouse cortex with live imaging and electrophysiology","pmids":["23791194"],"confidence":"High","gaps":["How PHF6 toggles between PAF1 and NuRD complexes unclear","Direct transcriptional targets mediating migration beyond NGC/CSPG5 not mapped"]},{"year":2014,"claim":"Structural determination of the ePHD2 domain as a novel dsDNA-binding module, combined with crystallographic mapping of the RBBP4–PHF6 interface, provided the first atomic-level understanding of how PHF6 engages chromatin and recruits repressive machinery.","evidence":"X-ray crystallography of ePHD2 and RBBP4–PHF6 peptide complex, in vitro binding assays, GAL4 reporter repression assay, mutagenesis","pmids":["24554700","25601084"],"confidence":"High","gaps":["No structure of full-length PHF6 or PHF6 on a nucleosome","How ePHD1 contributes to chromatin targeting structurally unresolved"]},{"year":2016,"claim":"Sub-nucleolar mapping of PHF6 to the fibrillar center/dense fibrillar component and demonstration that PHF6 gain-of-function elevates non-coding rDNA-derived RNAs refined its role as a repressor acting across the entire rDNA repeat.","evidence":"RNase/DNase/ActD treatment with immunocytochemistry, ChIP-qPCR across rDNA, rRNA quantification","pmids":["27165002"],"confidence":"High","gaps":["Functional significance of pRNA and IGS RNA induction not tested directly","Whether PHF6 directly binds rDNA versus is tethered through UBF not resolved"]},{"year":2017,"claim":"Genome-wide chromatin accessibility analysis upon PHF6 loss in B-cell leukemia showed that PHF6 maintains hematopoietic lineage identity by preserving the chromatin landscape at lineage-specific transcription factor loci.","evidence":"ATAC-seq, RNA-seq, CRISPR knockout, in vivo transplantation in mouse B-cell leukemia","pmids":["28607179"],"confidence":"High","gaps":["Direct versus indirect effects on chromatin accessibility not deconvolved","Whether PHF6 loss is sufficient for lineage switching in normal hematopoiesis unknown"]},{"year":2019,"claim":"Three parallel discoveries — PARP-dependent recruitment to DNA breaks promoting NHEJ, repression of immediate-early genes in AgRP neurons, and restraint of HSC self-renewal via TNFα signaling — expanded PHF6's functional repertoire beyond transcription to DNA repair and metabolic/immune signaling.","evidence":"Live-cell laser microirradiation with PARP inhibitor, NHEJ reporter; cell-type-specific ChIP in AgRP neurons with conditional KO and behavioral assays; conditional Phf6 KO mouse with competitive repopulation and serial transplantation","pmids":["31782600","32187544","30917958"],"confidence":"High","gaps":["Biochemical mechanism of PHF6 in NHEJ (what step it facilitates) undefined","Whether TNFα pathway regulation is transcriptionally direct or indirect unknown","How hunger-state signals regulate PHF6 chromatin occupancy not established"]},{"year":2020,"claim":"Demonstration that PHF6 possesses intrinsic E3 ubiquitin ligase activity for H2BK120ub, directed by ePHD2 reading of H2BK12 acetylation, established a direct enzymatic function beyond chromatin adaptor roles.","evidence":"In vitro ubiquitination assay with recombinant domains, domain deletion/mutagenesis, ChIP, RNA-seq","pmids":["32735658"],"confidence":"High","gaps":["E3 ligase activity not independently replicated by other groups","Whether PHF6 ubiquitin ligase activity is relevant outside trophectoderm differentiation context unknown","E2 partner not identified"]},{"year":2021,"claim":"Identification of PHF6-mediated recruitment of SUV39H1 and SUV4-20H2 to rDNA, gated by DNMT1-dependent DNA methylation, provided a mechanistic chain linking DNA methylation → PHF6 occupancy → repressive histone marks → rDNA silencing.","evidence":"Co-IP, ChIP, MeDIP-seq, bisulfite sequencing, DNMT1 knockdown/deficiency models, clinical PHF6 mutant analysis","pmids":["35847518","34520760"],"confidence":"High","gaps":["How PHF6 senses hypomethylated versus methylated DNA at the structural level unknown","Relative contributions of SUV39H1 versus SUV4-20H2 to rDNA silencing not dissected"]},{"year":2022,"claim":"Proteomic and native ChIP-seq approaches revealed PHF6 engages NuRD, SWI/SNF, and ISWI remodelers and preferentially occupies heterochromatic satellite DNA enriched in H3K9me3, broadening its role to heterochromatin maintenance and satellite repeat integrity.","evidence":"IP-MS, native ChIP-seq, single-molecule locus-specific analysis, DNA damage assays","pmids":["35338774"],"confidence":"High","gaps":["Whether PHF6 has distinct functions at satellite DNA versus promoters not tested","Functional consequence of satellite DNA occupancy for genome stability not directly shown"]},{"year":2024,"claim":"Convergent studies established that PHF6 co-localizes with SWI/SNF at promoters to maintain active chromatin (with Pol II progression dependent on PHF6 in SMARCB1-deficient contexts), drives Ephrin receptor transcription for neural stem cell self-renewal, interacts with RUNX1 at active enhancers in myeloid cells, and regulates cortical neurogenesis programs.","evidence":"CRISPR genome-scale screens, ChIP-seq, ATAC-seq, Co-IP, BFLS knockin mice, conditional KO, eNSC rescue, electrophysiology, proteomics","pmids":["39181868","38429579","38418452","39405291"],"confidence":"High","gaps":["Whether PHF6–SWI/SNF cooperation is relevant beyond SMARCB1-deficient tumors not tested","How PHF6 switches between repressive (NuRD) and activating (SWI/SNF) functions mechanistically unresolved","Direct versus indirect transcriptional effects in cortical development not fully deconvolved"]},{"year":2025,"claim":"Discovery that PHIP is an obligate partner required for PHF6 chromatin occupancy unified the model: PHF6 depends on PHIP to access chromatin and execute its transcriptional repression program, and PHIP loss phenocopies PHF6 loss in AML leukemia-initiating cell expansion.","evidence":"Reciprocal Co-IP, ChIP-seq of PHF6 ± PHIP, CRISPR KO of both genes, mouse AML models, transcriptomics","pmids":["40721297"],"confidence":"High","gaps":["Whether PHIP is required for all PHF6 functions (e.g., rDNA silencing, DNA repair) or only leukemic contexts unknown","Structural basis of the PHF6–PHIP complex not determined"]},{"year":null,"claim":"Key unresolved questions include how PHF6 switches between repressive (NuRD) and activating (SWI/SNF) modes at different loci, whether its E3 ubiquitin ligase activity operates broadly or is context-restricted, the structural basis of the full-length PHF6–PHIP–chromatin complex, and how PHF6 integrates DNA damage repair with its transcriptional functions.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length PHF6 structure or cryo-EM of PHF6 on nucleosomes","Context-dependent switching between activation and repression not mechanistically explained","E3 ligase activity awaits independent replication and E2 identification","Interplay between DNA repair and transcriptional roles not connected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,7,17]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,4,5,8,10,14,20,24]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[12]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[12,13]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,4,10,17]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[0,2,7,13,16]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,5,14,20]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[8,17]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,3,5,10,14,20,22,24]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[8,12,13,16,17,20]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[9,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,6,22,23]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2,7,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,11,15,18]}],"complexes":["NuRD","PAF1 complex","SWI/SNF","PHF6-PHIP complex"],"partners":["RBBP4","CHD4","PHIP","UBF","SUV39H1","RUNX1","HIF1A","BPTF"],"other_free_text":[]},"mechanistic_narrative":"PHF6 is a chromatin-associated transcriptional regulator that controls gene expression programs governing hematopoietic lineage identity, neuronal development, and ribosomal RNA synthesis, functioning as both a tumor suppressor and a developmental regulator whose loss causes Börjeson-Forssman-Lehmann syndrome. PHF6 exerts transcriptional repression by recruiting the NuRD complex via direct binding of its disordered middle region to the RBBP4 β-propeller, by cooperating with SWI/SNF and ISWI remodeling complexes at promoters to maintain active chromatin, and by requiring PHIP as an obligate partner for chromatin occupancy [PMID:25601084, PMID:39181868, PMID:40721297]. At rDNA loci, PHF6 suppresses rRNA transcription through its PHD1-mediated interaction with UBF and by recruiting the histone methyltransferases SUV39H1 and SUV4-20H2 to establish repressive H3K9me3 and H4K20me3 marks, with access gated by DNMT1-dependent DNA methylation [PMID:23229552, PMID:35847518, PMID:34520760]. PHF6 also functions as an H2BK120 E3 ubiquitin ligase directed by ePHD2-mediated reading of H2BK12 acetylation, is recruited to DNA double-strand breaks in a PARP-dependent manner to promote NHEJ, and drives Ephrin receptor transcription in neural stem cells to control cortical neurogenesis [PMID:32735658, PMID:31782600, PMID:38429579]."},"prefetch_data":{"uniprot":{"accession":"Q8IWS0","full_name":"PHD finger protein 6","aliases":["PHD-like zinc finger protein"],"length_aa":365,"mass_kda":41.3,"function":"Transcriptional regulator that associates with ribosomal RNA promoters and suppresses ribosomal RNA (rRNA) transcription","subcellular_location":"Nucleus; Nucleus, nucleolus; Chromosome, centromere, kinetochore","url":"https://www.uniprot.org/uniprotkb/Q8IWS0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PHF6","classification":"Not Classified","n_dependent_lines":23,"n_total_lines":1208,"dependency_fraction":0.01903973509933775},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PHF6","total_profiled":1310},"omim":[{"mim_id":"613065","title":"LEUKEMIA, ACUTE LYMPHOBLASTIC; ALL","url":"https://www.omim.org/entry/613065"},{"mim_id":"613057","title":"MICRO RNA 26A2; MIR26A2","url":"https://www.omim.org/entry/613057"},{"mim_id":"612151","title":"MICRO RNA 26A1; MIR26A1","url":"https://www.omim.org/entry/612151"},{"mim_id":"609422","title":"MICRO RNA 92A1; MIR92A1","url":"https://www.omim.org/entry/609422"},{"mim_id":"609420","title":"MICRO RNA 20A; MIR20A","url":"https://www.omim.org/entry/609420"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PHF6"},"hgnc":{"alias_symbol":["KIAA1823","MGC14797","CENP-31"],"prev_symbol":["BFLS","BORJ"]},"alphafold":{"accession":"Q8IWS0","domains":[{"cath_id":"3.30.40.10","chopping":"30-126","consensus_level":"high","plddt":89.324,"start":30,"end":126},{"cath_id":"3.30.40.10","chopping":"227-346","consensus_level":"high","plddt":80.4912,"start":227,"end":346}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IWS0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IWS0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IWS0-F1-predicted_aligned_error_v6.png","plddt_mean":73.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PHF6","jax_strain_url":"https://www.jax.org/strain/search?query=PHF6"},"sequence":{"accession":"Q8IWS0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IWS0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IWS0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IWS0"}},"corpus_meta":[{"pmid":"20228800","id":"PMC_20228800","title":"PHF6 mutations in T-cell acute lymphoblastic leukemia.","date":"2010","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20228800","citation_count":248,"is_preprint":false},{"pmid":"12415272","id":"PMC_12415272","title":"Mutations in PHF6 are associated with Börjeson-Forssman-Lehmann syndrome.","date":"2002","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12415272","citation_count":177,"is_preprint":false},{"pmid":"25775228","id":"PMC_25775228","title":"Tau assembly: the dominant role of PHF6 (VQIVYK) in microtubule binding region repeat R3.","date":"2015","source":"The journal of physical chemistry. 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oligomer.","date":"2021","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/34331342","citation_count":5,"is_preprint":false},{"pmid":"37585669","id":"PMC_37585669","title":"Deciphering the Inhibitory Mechanism of Naphthoquinone-Dopamine on the Aggregation of Tau Core Fragments PHF6* and PHF6.","date":"2023","source":"ACS chemical neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37585669","citation_count":4,"is_preprint":false},{"pmid":"39215387","id":"PMC_39215387","title":"Unraveling the Structure and Dynamics of Ac-PHF6-NH2 Tau Segment Oligomers.","date":"2024","source":"ACS chemical neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/39215387","citation_count":4,"is_preprint":false},{"pmid":"35780573","id":"PMC_35780573","title":"MiR-1306-5p promotes cell proliferation and inhibits cell apoptosis in acute myeloid leukemia by downregulating PHF6 expression.","date":"2022","source":"Leukemia 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spontaneous seizures, enlarged brain ventricles and altered transcription in the cortex of a mouse model of the Börjeson-Forssman-Lehmann intellectual disability syndrome.","date":"2024","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39405291","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48358,"output_tokens":5685,"usd":0.115174},"stage2":{"model":"claude-opus-4-6","input_tokens":9318,"output_tokens":3824,"usd":0.213285},"total_usd":0.328459,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"PHF6 localizes diffusely to the nucleus with prominent nucleolar accumulation, as shown by transient transfection of GFP-tagged PHF6, suggesting a role in transcription.\",\n      \"method\": \"Transient transfection with GFP-tagged PHF6, fluorescence microscopy\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single localization experiment, no functional follow-up in same paper\",\n      \"pmids\": [\"12415272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PHF6 physically associates with multiple components of the NuRD (nucleosome remodeling and deacetylation) complex, including CHD4, HDAC1, and RBBP4; this PHF6-NuRD interaction is restricted to the nucleoplasm and is not present in the nucleolus.\",\n      \"method\": \"Flag-tagged PHF6 co-immunoprecipitation from HEK 293T cells followed by mass spectrometry; subcellular fractionation\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with MS identification, replicated by subsequent structural study\",\n      \"pmids\": [\"22720776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PHF6 localizes to the nucleolus and to ribosomal DNA (rDNA) promoter regions, directly interacts with upstream binding factor (UBF) through its PHD1 domain, and suppresses ribosomal RNA (rRNA) transcription by affecting UBF protein levels; PHF6 knockdown causes G2/M arrest and accumulation of DNA damage at the rDNA locus, reversible by knocking down UBF or overexpressing RNase I.\",\n      \"method\": \"ChIP, Co-IP, siRNA knockdown, cell cycle analysis, γH2AX measurement, RNase I rescue experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in single study including domain-specific interaction and functional rescue\",\n      \"pmids\": [\"23229552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PHF6 physically associates with the PAF1 transcription elongation complex, and knockdown of PHF6 profoundly impairs neuronal migration in the mouse cerebral cortex in vivo, forming white matter heterotopias with neuronal hyperexcitability; inhibition of PAF1 phenocopies this migration defect, and PHF6/PAF1 regulate the downstream target NGC/CSPG5.\",\n      \"method\": \"Co-IP, in utero electroporation knockdown in mouse cortex, live imaging, electrophysiology\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus in vivo KD with defined cellular phenotype and epistasis to PAF1\",\n      \"pmids\": [\"23791194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of the PHF6 ePHD2 domain (comprising an N-terminal pre-PHD C2HC zinc finger, a linker, and an atypical PHD finger) reveals it as a novel integrated structural module; ePHD2 binds dsDNA but not histones; PHF6 directly interacts with RBBP4 (a NuRD component) and exerts transcriptional repression activity through this interaction.\",\n      \"method\": \"X-ray crystallography, in vitro binding assays, GAL4 reporter transcriptional repression assay, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional validation and mutagenesis in same study\",\n      \"pmids\": [\"24554700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of the RBBP4–PHF6 peptide complex (residues 162–170) shows that PHF6 binds the top surface of the RBBP4 β-propeller via a pair of positively charged residues inserting into a negatively charged pocket; corresponding PHF6 mutants impair this interaction in vitro and in vivo; the PHF6 middle disordered region (residues 145–207) is sufficient for transcriptional repression mediated through RBBP4 recruitment, and RBBP4 knockdown diminishes PHF6-mediated repression.\",\n      \"method\": \"X-ray crystallography, mutagenesis, in vitro binding assay, GAL4 reporter assay, RBBP4 knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure of complex plus mutagenesis and functional validation\",\n      \"pmids\": [\"25601084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-128 directly targets PHF6 mRNA; restoring PHF6 expression counteracts the deleterious effect of miR-128 on neuronal migration, dendritic outgrowth, and intrinsic physiological properties in vivo, placing miR-128 upstream of PHF6 in cortical lamination and neuronal development.\",\n      \"method\": \"miRNA sponge experiments, rescue overexpression of PHF6, in utero electroporation, electrophysiology\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo rescue experiment with clear epistasis, multiple readouts\",\n      \"pmids\": [\"25556700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PHF6 localizes to the sub-nucleolar fibrillar center (FC) and dense fibrillar component (DFC) in an RNA-dependent manner; ChIP-qPCR shows PHF6 enrichment across the entire rDNA-coding sequence but not the intergenic spacer; PHF6 gain-of-function decreases overall rRNA transcription and increases repressive pRNA and non-coding IGS36RNA/IGS39RNA levels.\",\n      \"method\": \"RNase A/DNase I/ActD treatment followed by immunocytochemistry, ChIP-qPCR, rRNA quantification in gain-of-function model\",\n      \"journal\": \"European journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing sub-nucleolar localization with functional consequence\",\n      \"pmids\": [\"27165002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of PHF6 in B-cell leukemia causes systematic changes in chromatin accessibility at transcriptional start sites of B-cell- and T-cell-specific factors, down-regulation of B-cell identity genes, up-regulation of T-cell signaling genes, and gives rise to mixed-lineage lymphoma in vivo, indicating PHF6 maintains lineage identity through chromatin landscape maintenance.\",\n      \"method\": \"ATAC-seq, RNA-seq, CRISPR/Cas9 knockout, in vivo transplantation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genomics methods plus in vivo phenotype, single lab but rigorous\",\n      \"pmids\": [\"28607179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PHF6 is rapidly recruited to sites of DNA lesions in a PARP-dependent manner; loss of PHF6 dramatically compromises G2 checkpoint recovery and impairs DNA repair through classical non-homologous end joining (NHEJ).\",\n      \"method\": \"RNAi screen, live-cell imaging of PHF6 recruitment to laser-induced damage, PARP inhibitor treatment, NHEJ reporter assay, checkpoint recovery assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization to damage sites with mechanistic link to NHEJ repair, multiple methods\",\n      \"pmids\": [\"31782600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PHF6 acts as a transcriptional repressor in AgRP neurons, binding promoters of immediate-early genes (IEGs); PHF6 chromatin binding is dynamically regulated by hunger state; loss of PHF6 shifts the transcriptional profile to a hunger-state-like pattern in satiated mice and impairs hunger-driven feeding behavior.\",\n      \"method\": \"Cell-type-specific ChIP, RNA-seq in AgRP neurons, conditional KO, behavioral assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific ChIP plus conditional KO with defined behavioral and transcriptional readout\",\n      \"pmids\": [\"32187544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phf6 deficiency in hematopoietic stem cells (HSCs) represses expression of genes associated with TNFα signaling, conferring resistance to TNFα-mediated growth inhibition and enhancing HSC self-renewal and repopulating capacity.\",\n      \"method\": \"Conditional Phf6 knockout mouse, competitive repopulation assays, serial transplantation, gene expression analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with epistatic rescue (TNFα pathway), functional assays in vivo\",\n      \"pmids\": [\"30917958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PHF6 acts as an E3 ubiquitin ligase for ubiquitination of histone H2B at K120 (H2BK120ub) via its extended PHD1 domain; the extended PHD2 domain of PHF6 recognizes acetylation of H2BK12 (H2BK12Ac), and this recognition by ePHD2 is required for PHF6's E3 ubiquitin ligase activity for H2BK120ub, thereby activating trophectodermal genes.\",\n      \"method\": \"RNA-seq, ChIP assays, in vitro ubiquitination assay, domain deletion/mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with domain mutagenesis and ChIP validation\",\n      \"pmids\": [\"32735658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PHF6 binds H3K9me3 and H3K27me1 on nucleolar chromatin and recruits histone methyltransferase SUV39H1 to rDNA loci; PHF6 loss decreases SUV39H1 recruitment and H3K9me3 levels at rDNA, promoting rDNA transcription; clinical PHF6 mutants impair this interaction.\",\n      \"method\": \"Co-IP, ChIP, knockdown/overexpression of PHF6 and SUV39H1, xenograft models, patient sample analysis\",\n      \"journal\": \"Acta pharmaceutica sinica. B\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus ChIP epistasis plus patient validation\",\n      \"pmids\": [\"35847518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PHF6 represses p21 expression by directly binding to the p21 promoter region and recruiting RBBP4; loss of PHF6 derepresses p21, contributing to prednisolone resistance in T-ALL cells.\",\n      \"method\": \"ChIP, CRISPR-Cas9 correction of PHF6 point mutation, siRNA knockdown, MTT assay\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus functional rescue, single lab\",\n      \"pmids\": [\"30551478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PHF6 deficiency promotes JAK3M511I-induced T-ALL progression in mice by inhibiting the Bai1-Mdm2-P53 signaling pathway, independent of JAK3/STAT5 signaling.\",\n      \"method\": \"Mouse leukemia models, genetic epistasis (PHF6 KO + JAK3M511I), pathway analysis, inhibitor combination in vivo\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mouse genetic epistasis with pathway dissection, single lab\",\n      \"pmids\": [\"34465864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNMT1-mediated gene body methylation at rDNA prevents PHF6 binding to hypomethylated rDNA gene bodies; when gene body methylation is reduced, PHF6 occupancy increases and PHF6 recruits histone methyltransferase SUV4-20H2 to establish H4K20me3, thereby inhibiting rDNA transcription.\",\n      \"method\": \"MeDIP-seq, bisulfite sequencing, ChIP, immunofluorescence, DNMT1 knockdown/deficiency models\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal epigenomic methods establishing methylation-dependent PHF6 recruitment and functional consequence\",\n      \"pmids\": [\"34520760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PHF6 engages multiple nucleosome remodeling protein complexes including NuRD, SWI/SNF, and ISWI factors, as well as replication machinery and DNA repair proteins; native ChIP-seq shows PHF6 specifically associates with heterochromatin satellite DNA regions enriched in H3K9me3; PHF6 loss impairs resolution of single- and double-strand DNA breaks.\",\n      \"method\": \"Proteomics (immunoprecipitation-MS), native ChIP-seq, single-molecule locus-specific analysis, DNA damage assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS-based interactome plus ChIP-seq plus functional DNA repair assays, multiple orthogonal methods\",\n      \"pmids\": [\"35338774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHF6 physically interacts with NF-κB subunit p50; PHF6 depletion disrupts the PHF6-p50 complex and partially inhibits nuclear translocation of p50, suppressing BCL2 expression and inhibiting AML cell proliferation/survival.\",\n      \"method\": \"Co-IP, siRNA knockdown, NF-κB inhibitor treatment, apoptosis and proliferation assays\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP plus functional assay, single lab\",\n      \"pmids\": [\"37393343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PHF6 physically interacts with HIF-1α and HIF-2α to potentiate HIF-driven transcriptional activity; PHF6 recruits BPTF to mediate epigenetic remodeling at HIF target gene loci; HIF double-knockout abolishes PHF6-mediated breast tumor growth.\",\n      \"method\": \"Co-IP, ChIP-qPCR, CRISPR HIF double-KO, xenograft models\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ChIP plus genetic epistasis via HIF DKO, single lab\",\n      \"pmids\": [\"36967443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PHF6 co-localizes with SWI/SNF complexes at promoters and is essential for maintaining active chromatin state at those loci; in SMARCB1-deficient cells, PHF6 loss disrupts the recruitment and stability of residual SWI/SNF complex members, resulting in loss of active chromatin at promoters and stalling of RNA Polymerase II progression.\",\n      \"method\": \"CRISPR-Cas9 genome-scale screen, ChIP-seq, ATAC-seq, co-IP, RNA Pol II occupancy assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genomic and biochemical methods, clear mechanistic model\",\n      \"pmids\": [\"39181868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PHF6 directly interacts with RUNX1; both proteins co-localize at active enhancer regions that define lineage differentiation context in myeloid neoplasms.\",\n      \"method\": \"Proteomics, ChIP-seq co-localization, co-IP\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics plus ChIP co-localization, single study\",\n      \"pmids\": [\"38418452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PHF6 genome-wide binding in the developing cortex is enriched near genes involved in CNS development and neurogenesis; PHF6 directly promotes transcription of Ephrin receptors (EphRs); PHF6 regulation of EphR is impaired in BFLS mice and conditional Phf6 KO mice; EphR-A knockdown phenocopies PHF6 loss in embryonic neural stem cells (eNSCs) and forced EphR expression rescues BFLS mouse-derived eNSC defects.\",\n      \"method\": \"Genome-wide ChIP-seq in developing cortex, BFLS knockin mice, conditional KO, in vitro eNSC assays, rescue experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq plus genetic epistasis with rescue, multiple models\",\n      \"pmids\": [\"38429579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PHF6 loss in the developing cortex causes upregulation of genes including Reln, Nr4a2, Slc12a5, Phip, and ZIC transcription factors; Phf6-deficient neural precursor cells show reduced self-renewal and increased neuronal differentiation; Phf6-deficient cortical neurons show premature spontaneous neuronal activity.\",\n      \"method\": \"Germline and nervous-system-specific Phf6 KO mice, transcriptomic analysis, neurosphere assays, electrophysiology\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with transcriptomic and electrophysiological readouts, multiple models\",\n      \"pmids\": [\"39405291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PHF6 and PHIP form a functional chromatin complex; PHF6 requires PHIP to occupy chromatin and execute its downstream transcriptional repression program; PHF6 loss expands AML leukemia-initiating cells and upregulates a stemness gene network; PHIP loss phenocopies PHF6 loss.\",\n      \"method\": \"Co-IP, ChIP-seq, CRISPR/Cas9 KO of PHF6 and PHIP, mouse leukemia models, transcriptomics\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus ChIP-seq plus genetic epistasis with in vivo models\",\n      \"pmids\": [\"40721297\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PHF6 is a nuclear and nucleolar chromatin-adaptor protein that functions as a transcriptional repressor through multiple mechanisms: it interacts with the NuRD complex (via RBBP4, structurally defined), the PAF1 transcription elongation complex, SWI/SNF and ISWI remodelers, and PHIP (which is required for PHF6 chromatin occupancy); at rDNA loci it suppresses rRNA transcription by recruiting SUV39H1 to establish H3K9me3 and by binding UBF through its PHD1 domain; its ePHD2 domain binds dsDNA and reads H2BK12Ac to direct E3 ubiquitin ligase activity (H2BK120 ubiquitination) via PHD1; it is recruited to DNA double-strand breaks in a PARP-dependent manner and promotes non-homologous end joining; in neurons it drives Ephrin receptor transcription to control neural stem cell self-renewal and neuronal migration; and in hematopoietic stem cells it restrains self-renewal partly through TNFα signaling, collectively explaining its roles as a tumor suppressor in T-ALL/AML and as a developmental regulator whose loss causes Börjeson-Forssman-Lehmann syndrome.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PHF6 is a chromatin-associated transcriptional regulator that controls gene expression programs governing hematopoietic lineage identity, neuronal development, and ribosomal RNA synthesis, functioning as both a tumor suppressor and a developmental regulator whose loss causes Börjeson-Forssman-Lehmann syndrome. PHF6 exerts transcriptional repression by recruiting the NuRD complex via direct binding of its disordered middle region to the RBBP4 β-propeller, by cooperating with SWI/SNF and ISWI remodeling complexes at promoters to maintain active chromatin, and by requiring PHIP as an obligate partner for chromatin occupancy [PMID:25601084, PMID:39181868, PMID:40721297]. At rDNA loci, PHF6 suppresses rRNA transcription through its PHD1-mediated interaction with UBF and by recruiting the histone methyltransferases SUV39H1 and SUV4-20H2 to establish repressive H3K9me3 and H4K20me3 marks, with access gated by DNMT1-dependent DNA methylation [PMID:23229552, PMID:35847518, PMID:34520760]. PHF6 also functions as an H2BK120 E3 ubiquitin ligase directed by ePHD2-mediated reading of H2BK12 acetylation, is recruited to DNA double-strand breaks in a PARP-dependent manner to promote NHEJ, and drives Ephrin receptor transcription in neural stem cells to control cortical neurogenesis [PMID:32735658, PMID:31782600, PMID:38429579].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing PHF6 as a nuclear/nucleolar protein set the stage for understanding it as a chromatin-associated factor rather than a cytoplasmic signaling protein.\",\n      \"evidence\": \"GFP-tagged PHF6 transfection and fluorescence microscopy in cell lines\",\n      \"pmids\": [\"12415272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of nucleolar localization established\", \"Single overexpression system without endogenous protein confirmation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that PHF6 physically associates with the NuRD complex (CHD4, HDAC1, RBBP4) in the nucleoplasm and separately binds UBF at rDNA to suppress rRNA transcription established PHF6 as a dual-compartment transcriptional repressor with distinct nucleoplasmic and nucleolar functions.\",\n      \"evidence\": \"Flag-tagged PHF6 Co-IP/MS from HEK293T cells with subcellular fractionation; ChIP at rDNA loci, Co-IP with UBF, siRNA knockdown with cell-cycle and γH2AX readouts\",\n      \"pmids\": [\"22720776\", \"23229552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which PHF6 regulates UBF protein levels unknown\", \"Genome-wide target repertoire of PHF6-NuRD not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of the PHF6–PAF1 complex interaction and the in vivo neuronal migration phenotype upon PHF6 loss revealed PHF6 as a critical regulator of cortical development, linking chromatin regulation to brain lamination.\",\n      \"evidence\": \"Co-IP plus in utero electroporation knockdown in mouse cortex with live imaging and electrophysiology\",\n      \"pmids\": [\"23791194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PHF6 toggles between PAF1 and NuRD complexes unclear\", \"Direct transcriptional targets mediating migration beyond NGC/CSPG5 not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Structural determination of the ePHD2 domain as a novel dsDNA-binding module, combined with crystallographic mapping of the RBBP4–PHF6 interface, provided the first atomic-level understanding of how PHF6 engages chromatin and recruits repressive machinery.\",\n      \"evidence\": \"X-ray crystallography of ePHD2 and RBBP4–PHF6 peptide complex, in vitro binding assays, GAL4 reporter repression assay, mutagenesis\",\n      \"pmids\": [\"24554700\", \"25601084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of full-length PHF6 or PHF6 on a nucleosome\", \"How ePHD1 contributes to chromatin targeting structurally unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Sub-nucleolar mapping of PHF6 to the fibrillar center/dense fibrillar component and demonstration that PHF6 gain-of-function elevates non-coding rDNA-derived RNAs refined its role as a repressor acting across the entire rDNA repeat.\",\n      \"evidence\": \"RNase/DNase/ActD treatment with immunocytochemistry, ChIP-qPCR across rDNA, rRNA quantification\",\n      \"pmids\": [\"27165002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of pRNA and IGS RNA induction not tested directly\", \"Whether PHF6 directly binds rDNA versus is tethered through UBF not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genome-wide chromatin accessibility analysis upon PHF6 loss in B-cell leukemia showed that PHF6 maintains hematopoietic lineage identity by preserving the chromatin landscape at lineage-specific transcription factor loci.\",\n      \"evidence\": \"ATAC-seq, RNA-seq, CRISPR knockout, in vivo transplantation in mouse B-cell leukemia\",\n      \"pmids\": [\"28607179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect effects on chromatin accessibility not deconvolved\", \"Whether PHF6 loss is sufficient for lineage switching in normal hematopoiesis unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Three parallel discoveries — PARP-dependent recruitment to DNA breaks promoting NHEJ, repression of immediate-early genes in AgRP neurons, and restraint of HSC self-renewal via TNFα signaling — expanded PHF6's functional repertoire beyond transcription to DNA repair and metabolic/immune signaling.\",\n      \"evidence\": \"Live-cell laser microirradiation with PARP inhibitor, NHEJ reporter; cell-type-specific ChIP in AgRP neurons with conditional KO and behavioral assays; conditional Phf6 KO mouse with competitive repopulation and serial transplantation\",\n      \"pmids\": [\"31782600\", \"32187544\", \"30917958\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism of PHF6 in NHEJ (what step it facilitates) undefined\", \"Whether TNFα pathway regulation is transcriptionally direct or indirect unknown\", \"How hunger-state signals regulate PHF6 chromatin occupancy not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstration that PHF6 possesses intrinsic E3 ubiquitin ligase activity for H2BK120ub, directed by ePHD2 reading of H2BK12 acetylation, established a direct enzymatic function beyond chromatin adaptor roles.\",\n      \"evidence\": \"In vitro ubiquitination assay with recombinant domains, domain deletion/mutagenesis, ChIP, RNA-seq\",\n      \"pmids\": [\"32735658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase activity not independently replicated by other groups\", \"Whether PHF6 ubiquitin ligase activity is relevant outside trophectoderm differentiation context unknown\", \"E2 partner not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of PHF6-mediated recruitment of SUV39H1 and SUV4-20H2 to rDNA, gated by DNMT1-dependent DNA methylation, provided a mechanistic chain linking DNA methylation → PHF6 occupancy → repressive histone marks → rDNA silencing.\",\n      \"evidence\": \"Co-IP, ChIP, MeDIP-seq, bisulfite sequencing, DNMT1 knockdown/deficiency models, clinical PHF6 mutant analysis\",\n      \"pmids\": [\"35847518\", \"34520760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PHF6 senses hypomethylated versus methylated DNA at the structural level unknown\", \"Relative contributions of SUV39H1 versus SUV4-20H2 to rDNA silencing not dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Proteomic and native ChIP-seq approaches revealed PHF6 engages NuRD, SWI/SNF, and ISWI remodelers and preferentially occupies heterochromatic satellite DNA enriched in H3K9me3, broadening its role to heterochromatin maintenance and satellite repeat integrity.\",\n      \"evidence\": \"IP-MS, native ChIP-seq, single-molecule locus-specific analysis, DNA damage assays\",\n      \"pmids\": [\"35338774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PHF6 has distinct functions at satellite DNA versus promoters not tested\", \"Functional consequence of satellite DNA occupancy for genome stability not directly shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Convergent studies established that PHF6 co-localizes with SWI/SNF at promoters to maintain active chromatin (with Pol II progression dependent on PHF6 in SMARCB1-deficient contexts), drives Ephrin receptor transcription for neural stem cell self-renewal, interacts with RUNX1 at active enhancers in myeloid cells, and regulates cortical neurogenesis programs.\",\n      \"evidence\": \"CRISPR genome-scale screens, ChIP-seq, ATAC-seq, Co-IP, BFLS knockin mice, conditional KO, eNSC rescue, electrophysiology, proteomics\",\n      \"pmids\": [\"39181868\", \"38429579\", \"38418452\", \"39405291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PHF6–SWI/SNF cooperation is relevant beyond SMARCB1-deficient tumors not tested\", \"How PHF6 switches between repressive (NuRD) and activating (SWI/SNF) functions mechanistically unresolved\", \"Direct versus indirect transcriptional effects in cortical development not fully deconvolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that PHIP is an obligate partner required for PHF6 chromatin occupancy unified the model: PHF6 depends on PHIP to access chromatin and execute its transcriptional repression program, and PHIP loss phenocopies PHF6 loss in AML leukemia-initiating cell expansion.\",\n      \"evidence\": \"Reciprocal Co-IP, ChIP-seq of PHF6 ± PHIP, CRISPR KO of both genes, mouse AML models, transcriptomics\",\n      \"pmids\": [\"40721297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PHIP is required for all PHF6 functions (e.g., rDNA silencing, DNA repair) or only leukemic contexts unknown\", \"Structural basis of the PHF6–PHIP complex not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how PHF6 switches between repressive (NuRD) and activating (SWI/SNF) modes at different loci, whether its E3 ubiquitin ligase activity operates broadly or is context-restricted, the structural basis of the full-length PHF6–PHIP–chromatin complex, and how PHF6 integrates DNA damage repair with its transcriptional functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length PHF6 structure or cryo-EM of PHF6 on nucleosomes\", \"Context-dependent switching between activation and repression not mechanistically explained\", \"E3 ligase activity awaits independent replication and E2 identification\", \"Interplay between DNA repair and transcriptional roles not connected\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 7, 17]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 4, 5, 8, 10, 14, 20, 24]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [12, 13]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 4, 10, 17]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [0, 2, 7, 13, 16]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 5, 14, 20]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [8, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 3, 5, 10, 14, 20, 22, 24]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [8, 12, 13, 16, 17, 20]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [9, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 6, 22, 23]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2, 7, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 11, 15, 18]}\n    ],\n    \"complexes\": [\n      \"NuRD\",\n      \"PAF1 complex\",\n      \"SWI/SNF\",\n      \"PHF6-PHIP complex\"\n    ],\n    \"partners\": [\n      \"RBBP4\",\n      \"CHD4\",\n      \"PHIP\",\n      \"UBF\",\n      \"SUV39H1\",\n      \"RUNX1\",\n      \"HIF1A\",\n      \"BPTF\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}