{"gene":"ZBTB24","run_date":"2026-04-28T23:00:24","timeline":{"discoveries":[{"year":2011,"finding":"Mutations in ZBTB24 cause ICF syndrome type 2 (ICF2), characterized by hypomethylation of juxtacentromeric repeat sequences, immunodeficiency, and centromeric instability, identifying ZBTB24 as a gene involved in DNA methylation of juxtacentromeric DNA and B cell development.","method":"Homozygosity mapping, whole-exome sequencing, and Sanger sequencing in ICF2 patients","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic identification replicated across multiple unrelated patients and labs","pmids":["21596365"],"is_preprint":false},{"year":2013,"finding":"Mouse Zbtb24 proteins carrying ICF2 missense mutations (C383Y or R320X equivalents) are mislocalized from pericentromeric heterochromatin, demonstrating that zinc-finger domains are required for proper intranuclear localization of ZBTB24 to pericentromeric heterochromatin, and that this localization does not require DNA methylation.","method":"Immunofluorescence analysis of wild-type and mutant Zbtb24 in mouse cells","journal":"Journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, direct localization experiment with functional consequence","pmids":["23739126"],"is_preprint":false},{"year":2016,"finding":"ZBTB24 directly controls transcription of CDCA7 by binding to its promoter; loss of functional Zbtb24 (BTB domain deletion) leads to early embryonic lethality in mice and dramatically reduces Cdca7 expression, which can be restored by ectopic ZBTB24 expression.","method":"Zbtb24 BTB domain deletion mouse model, transcriptome analysis, chromatin immunoprecipitation (ChIP) at CDCA7 promoter, ectopic expression rescue","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KO mouse, transcriptomics, ChIP, rescue) in single study","pmids":["27466202"],"is_preprint":false},{"year":2016,"finding":"Knockdown of ZBTB24 in human B cells (Raji) blocks G0/1- to S-phase cell-cycle progression and upregulates IRF-4 and Blimp-1 expression, demonstrating a role for ZBTB24 in regulating B cell proliferation via transcriptional control of these factors, independent of BCL-6.","method":"shRNA knockdown, cell-cycle analysis, gene expression analysis in human B cell line","journal":"Genes and immunity","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype and pathway placement","pmids":["27098601"],"is_preprint":false},{"year":2018,"finding":"ZBTB24 co-occupies genomic loci with DNMT3B to regulate gene body DNA methylation; ChIP identified common binding sites, and loss-of-function approaches showed ZBTB24 directly activates CDCA7, AXIN2, and OSTC promoters and represses RNF169 and CAMKMT, with a defined 12-bp DNA binding motif.","method":"ChIP-seq, loss-of-function experiments, DNA binding motif identification, gene expression analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, KD, motif validation) across multiple loci","pmids":["30085123"],"is_preprint":false},{"year":2018,"finding":"ICF2, 3, and 4 mutations (in ZBTB24, CDCA7, and HELLS respectively) affect DNA methylation at CpG-poor heterochromatin regions distinct from ICF1 (DNMT3B) targets, placing ZBTB24 in a functional pathway with CDCA7 and HELLS for heterochromatin methylation maintenance.","method":"Comparative genome-wide methylation profiling across all four ICF patient genotypes","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — comparative multi-genotype methylome analysis, single study","pmids":["29659838"],"is_preprint":false},{"year":2019,"finding":"Crystal structure of ZBTB24 zinc fingers 5-8 bound to a 12-bp consensus DNA sequence [CT(G/T)CCAGGACCT] revealed that ZF5-8 confer DNA binding specificity; ICF2 missense mutations C382Y and C407G in the ZF domain abolish specific DNA binding and fail to induce CDCA7 expression.","method":"X-ray crystallography, DNA binding assays, ICF2 missense mutant functional analysis, CDCA7 expression assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with DNA binding validation and disease mutation functional analysis","pmids":["31226215"],"is_preprint":false},{"year":2019,"finding":"The AT-hook motif and the 6th zinc-finger motif of ZBTB24 are required for heterochromatin localization, while the 6th and 7th zinc-finger motifs (not AT-hook or BTB domain) are essential for transcriptional activation of CDCA7; two ZBTB24 binding motifs in the CDCA7 promoter are required for transcriptional activation.","method":"Domain deletion analysis, immunofluorescence localization, CDCA7 promoter deletion analysis, transcriptional activation assays","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — domain deletion with both localization and functional transcriptional readout","pmids":["31561277"],"is_preprint":false},{"year":2019,"finding":"ZBTB24 deficiency upregulates TRAIL and TRAIL death receptors (TRAIL-R1/2) in human T cells, causing increased apoptosis; this is mediated through reduced CDCA7 expression, as CDCA7 overexpression rescues the apoptosis phenotype in ZBTB24-depleted T cells, placing ZBTB24 upstream of CDCA7 in the TRAIL-R apoptosis axis.","method":"shRNA knockdown of ZBTB24 and CDCA7 in Jurkat and primary T cells, CDCA7 overexpression rescue, TRAIL-R blocking experiments, apoptosis assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis established by rescue experiment with multiple methods","pmids":["31030944"],"is_preprint":false},{"year":2020,"finding":"ZBTB24 associates with PARP1 and stimulates its auto-poly(ADP-ribosyl)ation; the ZBTB24 zinc-finger domain binds PARP1-associated poly(ADP-ribose) (PAR) chains and mediates PARP1-dependent recruitment of ZBTB24 to DNA breaks; ZBTB24 protects PAR chains from PARG-mediated degradation and facilitates PAR-dependent assembly of the LIG4/XRCC4 complex at DNA breaks, promoting error-free NHEJ and immunoglobulin class-switch recombination.","method":"Co-immunoprecipitation of ZBTB24 with PARP1, PARP1 auto-PARylation assay, PAR chain binding assay, recruitment to DNA breaks, LIG4/XRCC4 assembly assay, B cells from ICF2 patients and Zbtb24-deficient mice, class-switch recombination assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal biochemical assays, patient cells and mouse model, mechanistic pathway established","pmids":["32865561"],"is_preprint":false},{"year":2023,"finding":"Zbtb24 deficiency in hematopoietic lineage (Vav-Cre) causes severe loss of DNA methylation in the promoter of Il5ra, leading to its derepression, elevated CD19 phosphorylation, and hypogammaglobulinemia; heterozygous disruption of Cd19 reverts the hypogammaglobulinemia phenotype, placing ZBTB24 upstream of Il5ra methylation and CD19 signaling in B cell antibody production.","method":"Conditional knockout mouse (Vav-Cre), DNA methylation analysis at Il5ra promoter, CD19 phosphorylation assay, genetic epistasis (Cd19 heterozygous disruption rescue), immunoglobulin measurement","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with mechanistic pathway established by epistasis and methylation analysis","pmids":["37990035"],"is_preprint":false},{"year":2024,"finding":"B cell-specific deletion of Zbtb24 specifically impairs plasma cell differentiation of B1 cells (not conventional B2 cells) by attenuating heme biosynthesis partially through mTORC1; exogenous hemin supplementation rescues the B1 cell differentiation defect of Zbtb24-null cells.","method":"B cell-specific CRISPR/Cas9 Zbtb24 knockout mice, flow cytometry, in vitro B1 cell differentiation, RNA-Seq, hemin rescue experiment","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 — cell-specific KO with defined phenotype and rescue experiment, single study","pmids":["39277732"],"is_preprint":false},{"year":2025,"finding":"ZBTB24 is recruited to centromeric satellite DNA where it is required to establish and maintain correct DNA methylation patterns through the recruitment of DNMT3B; this function is conserved between mouse and human cells, and disruption of ZBTB24 using an auxin-inducible degron system leads to loss of centromeric satellite DNA methylation.","method":"Constitutive Zbtb24 ICF-like mouse mutant, auxin-inducible degron system in mESCs, ChIP at centromeric satellite DNA, DNA methylation analysis, human cell analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 — multiple model systems, direct ChIP at satellite DNA, inducible KO with methylation readout","pmids":["39562305"],"is_preprint":false},{"year":2025,"finding":"The ZBTB24-CDCA7-HELLS axis maintains DNA methylation of the Dux cluster, suppressing 2C-like reprogramming in mouse ESCs; disruption of this pathway leads to Dux hypomethylation and derepression, upregulating 2C-specific genes, which is reversed by site-specific re-methylation at the Dux promoter.","method":"Genetic disruption of ZBTB24/CDCA7/HELLS in mESCs, genome-wide methylation analysis, 2C-gene expression profiling, site-specific CpG re-methylation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — multiple pathway components tested, site-specific methylation rescue validates mechanism","pmids":["40226918"],"is_preprint":false},{"year":2026,"finding":"Missense variants (p.Val43Leu, p.Ser59Gly) in the BTB domain of ZBTB24 cause significant protein instability, resulting in loss-of-function and ICF2 syndrome with genome-wide DNA hypomethylation patterns identical to verified ICF2 patients, demonstrating that BTB domain integrity is required for ZBTB24 protein stability.","method":"Patient genetic analysis, ZBTB24 protein stability assays, whole-genome DNA methylation profiling","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — protein stability assay with clinical validation, single study","pmids":["41359419"],"is_preprint":false}],"current_model":"ZBTB24 is a BTB-zinc finger transcription factor that binds a specific 12-bp DNA sequence through its ZF5-8 domains to directly activate target genes including CDCA7; it recruits DNMT3B to centromeric satellite DNA and gene loci to establish and maintain DNA methylation; it associates with PARP1, stimulates its auto-PARylation, and uses PAR chain binding to facilitate LIG4/XRCC4-dependent NHEJ at DNA breaks; through the ZBTB24-CDCA7-HELLS axis it suppresses totipotent 2C-like reprogramming and maintains heterochromatin methylation; and in B cells it controls Il5ra promoter methylation to regulate CD19 signaling and antibody production, with loss-of-function mutations in any functional domain causing ICF syndrome type 2."},"narrative":{"teleology":[{"year":2011,"claim":"Identification of ZBTB24 as the ICF2 disease gene established that a previously uncharacterized BTB-zinc finger protein is required for juxtacentromeric DNA methylation and immune function.","evidence":"Homozygosity mapping and exome sequencing in multiple unrelated ICF2 families","pmids":["21596365"],"confidence":"High","gaps":["Mechanism by which ZBTB24 controls DNA methylation unknown","Target genes and DNA binding specificity undefined","Contribution to immunodeficiency versus centromeric instability unresolved"]},{"year":2013,"claim":"Demonstration that ICF2 missense mutations displace ZBTB24 from pericentromeric heterochromatin established the zinc-finger domains as essential for subnuclear targeting, independent of pre-existing DNA methylation.","evidence":"Immunofluorescence of wild-type and ICF2 mutant Zbtb24 in mouse cells","pmids":["23739126"],"confidence":"Medium","gaps":["Direct DNA binding of ZBTB24 not demonstrated","Mechanism of heterochromatin recognition not resolved","Only two mutations tested"]},{"year":2016,"claim":"Discovery that ZBTB24 directly activates CDCA7 transcription and that BTB domain loss causes embryonic lethality identified the first direct transcriptional target and demonstrated ZBTB24 is essential for development.","evidence":"Zbtb24 BTB-deletion mouse, transcriptomics, ChIP at CDCA7 promoter, ectopic expression rescue","pmids":["27466202"],"confidence":"High","gaps":["DNA binding motif not yet defined","How ZBTB24 connects to the DNA methylation machinery unresolved","Role of CDCA7 in methylation maintenance not yet tested"]},{"year":2018,"claim":"Genome-wide binding analysis revealed ZBTB24 co-occupies loci with DNMT3B, defined a 12-bp binding motif, and identified multiple direct target genes, while comparative methylomics placed ZBTB24, CDCA7, and HELLS in a shared heterochromatin methylation pathway distinct from DNMT3B.","evidence":"ChIP-seq for ZBTB24 and DNMT3B, motif discovery, genome-wide methylation profiling across all four ICF genotypes","pmids":["30085123","29659838"],"confidence":"High","gaps":["Structural basis of DNA recognition unknown","Whether ZBTB24 directly recruits DNMT3B not tested","How the ZBTB24-CDCA7-HELLS axis cooperates mechanistically unresolved"]},{"year":2019,"claim":"Crystal structure of ZF5-8 bound to cognate DNA defined the atomic basis of sequence-specific recognition, showed ICF2 mutations abolish binding, and domain dissection separated heterochromatin localization (AT-hook + ZF6) from transcriptional activation (ZF6-7) functions.","evidence":"X-ray crystallography, DNA binding assays with ICF2 mutants, domain deletion and promoter deletion analyses","pmids":["31226215","31561277"],"confidence":"High","gaps":["Role of ZF1-4 undefined","No full-length structure available","In vivo validation of domain-specific functions limited"]},{"year":2020,"claim":"Discovery that ZBTB24 associates with PARP1, stimulates auto-PARylation, protects PAR chains from degradation, and facilitates LIG4/XRCC4-dependent NHEJ revealed a DNA methylation-independent function in DNA double-strand break repair and immunoglobulin class-switch recombination.","evidence":"Co-IP, PARylation assays, PAR binding assays, recruitment to DNA breaks, CSR assays in ICF2 patient cells and Zbtb24-deficient mice","pmids":["32865561"],"confidence":"High","gaps":["Relative contribution of NHEJ defect versus methylation defect to ICF2 immunodeficiency unknown","Whether ZBTB24 PAR binding and DNA binding are mutually exclusive unresolved","Structural basis of PAR chain interaction not determined"]},{"year":2023,"claim":"Conditional hematopoietic knockout established that ZBTB24 controls Il5ra promoter methylation, linking its loss to IL-5Rα derepression, hyperactive CD19 signaling, and hypogammaglobulinemia—a mechanism confirmed by genetic epistasis with Cd19.","evidence":"Vav-Cre conditional KO mouse, methylation analysis at Il5ra, CD19 phosphorylation assay, Cd19 heterozygous rescue","pmids":["37990035"],"confidence":"High","gaps":["Whether ZBTB24 directly binds the Il5ra promoter not shown","Applicability to human ICF2 B cells not confirmed","Role of other ZBTB24 targets in B cell dysfunction not dissected"]},{"year":2024,"claim":"B cell-specific deletion revealed that ZBTB24 is selectively required for B1 (not B2) plasma cell differentiation through maintenance of heme biosynthesis partially via mTORC1, uncovering a metabolic role.","evidence":"B cell-specific CRISPR KO mice, RNA-seq, hemin rescue of B1 differentiation defect","pmids":["39277732"],"confidence":"Medium","gaps":["Direct transcriptional targets mediating heme pathway control not identified","mTORC1 connection is partial and mechanism incomplete","Single study; independent replication needed"]},{"year":2025,"claim":"Acute degradation and ICF-like mouse models demonstrated that ZBTB24 recruits DNMT3B to centromeric satellite DNA for both establishment and maintenance of methylation, and the ZBTB24-CDCA7-HELLS axis silences the Dux cluster to suppress 2C-like reprogramming, validated by site-specific re-methylation rescue.","evidence":"Auxin-inducible degron in mESCs, constitutive ICF-like mouse, ChIP at satellite DNA, Dux promoter re-methylation in ZBTB24/CDCA7/HELLS-disrupted mESCs","pmids":["39562305","40226918"],"confidence":"High","gaps":["Whether ZBTB24 physically bridges DNMT3B to chromatin or acts indirectly through CDCA7/HELLS not resolved","Relevance of 2C-like derepression to ICF2 patient phenotype unknown","Contribution of individual satellite subfamilies to ICF2 centromeric instability not dissected"]},{"year":2026,"claim":"Identification of BTB domain missense variants causing protein instability and ICF2 established that the BTB domain is essential not only for protein-protein interactions but for overall ZBTB24 protein stability.","evidence":"Patient genotyping, protein stability assays, genome-wide methylation profiling matching verified ICF2 patterns","pmids":["41359419"],"confidence":"Medium","gaps":["Degradation pathway for unstable ZBTB24 not identified","Whether BTB domain mutations affect specific interaction partners not tested","Single study with limited number of variants"]},{"year":null,"claim":"Key unresolved questions include whether ZBTB24 directly bridges DNMT3B to target chromatin or acts exclusively via CDCA7/HELLS, the structural basis of PAR chain recognition by the zinc-finger domain, and the relative contributions of NHEJ defects versus DNA methylation loss to ICF2 immunodeficiency.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length ZBTB24 structure or ZBTB24-DNMT3B co-structure available","Relative pathogenic contribution of NHEJ versus methylation defect in ICF2 unknown","Whether ZBTB24 has additional transcription-independent roles beyond PARP1/NHEJ not explored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,6,7,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,3,4,7,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,7]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[1,12]}],"pathway":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[9]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5,12,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,4,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,10,11]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,14]}],"complexes":[],"partners":["DNMT3B","PARP1","CDCA7","HELLS","LIG4","XRCC4"],"other_free_text":[]},"mechanistic_narrative":"ZBTB24 is a BTB-zinc finger transcription factor that establishes and maintains DNA methylation at centromeric satellite repeats and gene regulatory regions, functioning as a master regulator of heterochromatin integrity, B cell development, and DNA repair. Its ZF5-8 domains bind a specific 12-bp DNA motif to directly activate target genes including CDCA7, forming the ZBTB24-CDCA7-HELLS axis that maintains CpG methylation at heterochromatin and suppresses totipotent 2C-like reprogramming by silencing the Dux cluster [PMID:30085123, PMID:31226215, PMID:40226918, PMID:39562305]. ZBTB24 also recruits DNMT3B to centromeric satellite DNA and gene loci, associates with PARP1 to stimulate auto-PARylation and facilitate LIG4/XRCC4-dependent NHEJ at DNA breaks promoting immunoglobulin class-switch recombination, and controls Il5ra promoter methylation to regulate CD19 signaling and antibody production in B cells [PMID:32865561, PMID:37990035, PMID:39562305]. Loss-of-function mutations in any functional domain of ZBTB24—including the BTB domain required for protein stability and the zinc-finger domains required for DNA binding and heterochromatin localization—cause ICF syndrome type 2, characterized by centromeric instability, DNA hypomethylation, and immunodeficiency [PMID:21596365, PMID:41359419]."},"prefetch_data":{"uniprot":{"accession":"O43167","full_name":"Zinc finger and BTB domain-containing protein 24","aliases":["Zinc finger protein 450"],"length_aa":697,"mass_kda":78.3,"function":"May be involved in BMP2-induced transcription","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O43167/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZBTB24","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZBTB24","total_profiled":1310},"omim":[{"mim_id":"618774","title":"CEBALID SYNDROME; CEBALID","url":"https://www.omim.org/entry/618774"},{"mim_id":"614069","title":"IMMUNODEFICIENCY-CENTROMERIC INSTABILITY-FACIAL ANOMALIES SYNDROME 2; ICF2","url":"https://www.omim.org/entry/614069"},{"mim_id":"614064","title":"ZINC FINGER- AND BTB DOMAIN-CONTAINING PROTEIN 24; ZBTB24","url":"https://www.omim.org/entry/614064"},{"mim_id":"609937","title":"CELL DIVISION CYCLE-ASSOCIATED PROTEIN 7; CDCA7","url":"https://www.omim.org/entry/609937"},{"mim_id":"603946","title":"HELICASE, LYMPHOID-SPECIFIC; HELLS","url":"https://www.omim.org/entry/603946"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":16.5}],"url":"https://www.proteinatlas.org/search/ZBTB24"},"hgnc":{"alias_symbol":["KIAA0441","BIF1","PATZ2"],"prev_symbol":["ZNF450"]},"alphafold":{"accession":"O43167","domains":[{"cath_id":"3.30.710","chopping":"12-63_79-133","consensus_level":"high","plddt":56.9709,"start":12,"end":133},{"cath_id":"3.30.160.60","chopping":"295-376","consensus_level":"high","plddt":79.6456,"start":295,"end":376},{"cath_id":"3.30.160.60","chopping":"433-486","consensus_level":"medium","plddt":82.2857,"start":433,"end":486}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43167","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43167-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43167-F1-predicted_aligned_error_v6.png","plddt_mean":56.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZBTB24","jax_strain_url":"https://www.jax.org/strain/search?query=ZBTB24"},"sequence":{"accession":"O43167","fasta_url":"https://rest.uniprot.org/uniprotkb/O43167.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43167/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43167"}},"corpus_meta":[{"pmid":"17891140","id":"PMC_17891140","title":"Bif-1 interacts with Beclin 1 through UVRAG and regulates autophagy and tumorigenesis.","date":"2007","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/17891140","citation_count":725,"is_preprint":false},{"pmid":"16227588","id":"PMC_16227588","title":"Loss of Bif-1 suppresses Bax/Bak conformational change and mitochondrial apoptosis.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/16227588","citation_count":164,"is_preprint":false},{"pmid":"20643123","id":"PMC_20643123","title":"A phosphatidylinositol 3-kinase class III sub-complex containing VPS15, VPS34, Beclin 1, UVRAG and BIF-1 regulates cytokinesis and degradative endocytic traffic.","date":"2010","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/20643123","citation_count":154,"is_preprint":false},{"pmid":"11259440","id":"PMC_11259440","title":"Molecular cloning and characterization of Bif-1. 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loss of functional Zbtb24 (BTB domain deletion) leads to early embryonic lethality in mice and dramatically reduces Cdca7 expression, which can be restored by ectopic ZBTB24 expression.\",\n      \"method\": \"Zbtb24 BTB domain deletion mouse model, transcriptome analysis, chromatin immunoprecipitation (ChIP) at CDCA7 promoter, ectopic expression rescue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO mouse, transcriptomics, ChIP, rescue) in single study\",\n      \"pmids\": [\"27466202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Knockdown of ZBTB24 in human B cells (Raji) blocks G0/1- to S-phase cell-cycle progression and upregulates IRF-4 and Blimp-1 expression, demonstrating a role for ZBTB24 in regulating B cell proliferation via transcriptional control of these factors, independent of BCL-6.\",\n      \"method\": \"shRNA knockdown, cell-cycle analysis, gene expression analysis in human B cell line\",\n      \"journal\": \"Genes and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and pathway placement\",\n      \"pmids\": [\"27098601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZBTB24 co-occupies genomic loci with DNMT3B to regulate gene body DNA methylation; ChIP identified common binding sites, and loss-of-function approaches showed ZBTB24 directly activates CDCA7, AXIN2, and OSTC promoters and represses RNF169 and CAMKMT, with a defined 12-bp DNA binding motif.\",\n      \"method\": \"ChIP-seq, loss-of-function experiments, DNA binding motif identification, gene expression analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, KD, motif validation) across multiple loci\",\n      \"pmids\": [\"30085123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ICF2, 3, and 4 mutations (in ZBTB24, CDCA7, and HELLS respectively) affect DNA methylation at CpG-poor heterochromatin regions distinct from ICF1 (DNMT3B) targets, placing ZBTB24 in a functional pathway with CDCA7 and HELLS for heterochromatin methylation maintenance.\",\n      \"method\": \"Comparative genome-wide methylation profiling across all four ICF patient genotypes\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comparative multi-genotype methylome analysis, single study\",\n      \"pmids\": [\"29659838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Crystal structure of ZBTB24 zinc fingers 5-8 bound to a 12-bp consensus DNA sequence [CT(G/T)CCAGGACCT] revealed that ZF5-8 confer DNA binding specificity; ICF2 missense mutations C382Y and C407G in the ZF domain abolish specific DNA binding and fail to induce CDCA7 expression.\",\n      \"method\": \"X-ray crystallography, DNA binding assays, ICF2 missense mutant functional analysis, CDCA7 expression assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with DNA binding validation and disease mutation functional analysis\",\n      \"pmids\": [\"31226215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The AT-hook motif and the 6th zinc-finger motif of ZBTB24 are required for heterochromatin localization, while the 6th and 7th zinc-finger motifs (not AT-hook or BTB domain) are essential for transcriptional activation of CDCA7; two ZBTB24 binding motifs in the CDCA7 promoter are required for transcriptional activation.\",\n      \"method\": \"Domain deletion analysis, immunofluorescence localization, CDCA7 promoter deletion analysis, transcriptional activation assays\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain deletion with both localization and functional transcriptional readout\",\n      \"pmids\": [\"31561277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZBTB24 deficiency upregulates TRAIL and TRAIL death receptors (TRAIL-R1/2) in human T cells, causing increased apoptosis; this is mediated through reduced CDCA7 expression, as CDCA7 overexpression rescues the apoptosis phenotype in ZBTB24-depleted T cells, placing ZBTB24 upstream of CDCA7 in the TRAIL-R apoptosis axis.\",\n      \"method\": \"shRNA knockdown of ZBTB24 and CDCA7 in Jurkat and primary T cells, CDCA7 overexpression rescue, TRAIL-R blocking experiments, apoptosis assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established by rescue experiment with multiple methods\",\n      \"pmids\": [\"31030944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZBTB24 associates with PARP1 and stimulates its auto-poly(ADP-ribosyl)ation; the ZBTB24 zinc-finger domain binds PARP1-associated poly(ADP-ribose) (PAR) chains and mediates PARP1-dependent recruitment of ZBTB24 to DNA breaks; ZBTB24 protects PAR chains from PARG-mediated degradation and facilitates PAR-dependent assembly of the LIG4/XRCC4 complex at DNA breaks, promoting error-free NHEJ and immunoglobulin class-switch recombination.\",\n      \"method\": \"Co-immunoprecipitation of ZBTB24 with PARP1, PARP1 auto-PARylation assay, PAR chain binding assay, recruitment to DNA breaks, LIG4/XRCC4 assembly assay, B cells from ICF2 patients and Zbtb24-deficient mice, class-switch recombination assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal biochemical assays, patient cells and mouse model, mechanistic pathway established\",\n      \"pmids\": [\"32865561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Zbtb24 deficiency in hematopoietic lineage (Vav-Cre) causes severe loss of DNA methylation in the promoter of Il5ra, leading to its derepression, elevated CD19 phosphorylation, and hypogammaglobulinemia; heterozygous disruption of Cd19 reverts the hypogammaglobulinemia phenotype, placing ZBTB24 upstream of Il5ra methylation and CD19 signaling in B cell antibody production.\",\n      \"method\": \"Conditional knockout mouse (Vav-Cre), DNA methylation analysis at Il5ra promoter, CD19 phosphorylation assay, genetic epistasis (Cd19 heterozygous disruption rescue), immunoglobulin measurement\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic pathway established by epistasis and methylation analysis\",\n      \"pmids\": [\"37990035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"B cell-specific deletion of Zbtb24 specifically impairs plasma cell differentiation of B1 cells (not conventional B2 cells) by attenuating heme biosynthesis partially through mTORC1; exogenous hemin supplementation rescues the B1 cell differentiation defect of Zbtb24-null cells.\",\n      \"method\": \"B cell-specific CRISPR/Cas9 Zbtb24 knockout mice, flow cytometry, in vitro B1 cell differentiation, RNA-Seq, hemin rescue experiment\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-specific KO with defined phenotype and rescue experiment, single study\",\n      \"pmids\": [\"39277732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ZBTB24 is recruited to centromeric satellite DNA where it is required to establish and maintain correct DNA methylation patterns through the recruitment of DNMT3B; this function is conserved between mouse and human cells, and disruption of ZBTB24 using an auxin-inducible degron system leads to loss of centromeric satellite DNA methylation.\",\n      \"method\": \"Constitutive Zbtb24 ICF-like mouse mutant, auxin-inducible degron system in mESCs, ChIP at centromeric satellite DNA, DNA methylation analysis, human cell analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple model systems, direct ChIP at satellite DNA, inducible KO with methylation readout\",\n      \"pmids\": [\"39562305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The ZBTB24-CDCA7-HELLS axis maintains DNA methylation of the Dux cluster, suppressing 2C-like reprogramming in mouse ESCs; disruption of this pathway leads to Dux hypomethylation and derepression, upregulating 2C-specific genes, which is reversed by site-specific re-methylation at the Dux promoter.\",\n      \"method\": \"Genetic disruption of ZBTB24/CDCA7/HELLS in mESCs, genome-wide methylation analysis, 2C-gene expression profiling, site-specific CpG re-methylation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple pathway components tested, site-specific methylation rescue validates mechanism\",\n      \"pmids\": [\"40226918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Missense variants (p.Val43Leu, p.Ser59Gly) in the BTB domain of ZBTB24 cause significant protein instability, resulting in loss-of-function and ICF2 syndrome with genome-wide DNA hypomethylation patterns identical to verified ICF2 patients, demonstrating that BTB domain integrity is required for ZBTB24 protein stability.\",\n      \"method\": \"Patient genetic analysis, ZBTB24 protein stability assays, whole-genome DNA methylation profiling\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — protein stability assay with clinical validation, single study\",\n      \"pmids\": [\"41359419\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZBTB24 is a BTB-zinc finger transcription factor that binds a specific 12-bp DNA sequence through its ZF5-8 domains to directly activate target genes including CDCA7; it recruits DNMT3B to centromeric satellite DNA and gene loci to establish and maintain DNA methylation; it associates with PARP1, stimulates its auto-PARylation, and uses PAR chain binding to facilitate LIG4/XRCC4-dependent NHEJ at DNA breaks; through the ZBTB24-CDCA7-HELLS axis it suppresses totipotent 2C-like reprogramming and maintains heterochromatin methylation; and in B cells it controls Il5ra promoter methylation to regulate CD19 signaling and antibody production, with loss-of-function mutations in any functional domain causing ICF syndrome type 2.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ZBTB24 is a BTB-zinc finger transcription factor that establishes and maintains DNA methylation at centromeric satellite repeats and gene regulatory regions, functioning as a master regulator of heterochromatin integrity, B cell development, and DNA repair. Its ZF5-8 domains bind a specific 12-bp DNA motif to directly activate target genes including CDCA7, forming the ZBTB24-CDCA7-HELLS axis that maintains CpG methylation at heterochromatin and suppresses totipotent 2C-like reprogramming by silencing the Dux cluster [PMID:30085123, PMID:31226215, PMID:40226918, PMID:39562305]. ZBTB24 also recruits DNMT3B to centromeric satellite DNA and gene loci, associates with PARP1 to stimulate auto-PARylation and facilitate LIG4/XRCC4-dependent NHEJ at DNA breaks promoting immunoglobulin class-switch recombination, and controls Il5ra promoter methylation to regulate CD19 signaling and antibody production in B cells [PMID:32865561, PMID:37990035, PMID:39562305]. Loss-of-function mutations in any functional domain of ZBTB24—including the BTB domain required for protein stability and the zinc-finger domains required for DNA binding and heterochromatin localization—cause ICF syndrome type 2, characterized by centromeric instability, DNA hypomethylation, and immunodeficiency [PMID:21596365, PMID:41359419].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of ZBTB24 as the ICF2 disease gene established that a previously uncharacterized BTB-zinc finger protein is required for juxtacentromeric DNA methylation and immune function.\",\n      \"evidence\": \"Homozygosity mapping and exome sequencing in multiple unrelated ICF2 families\",\n      \"pmids\": [\"21596365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ZBTB24 controls DNA methylation unknown\", \"Target genes and DNA binding specificity undefined\", \"Contribution to immunodeficiency versus centromeric instability unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstration that ICF2 missense mutations displace ZBTB24 from pericentromeric heterochromatin established the zinc-finger domains as essential for subnuclear targeting, independent of pre-existing DNA methylation.\",\n      \"evidence\": \"Immunofluorescence of wild-type and ICF2 mutant Zbtb24 in mouse cells\",\n      \"pmids\": [\"23739126\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNA binding of ZBTB24 not demonstrated\", \"Mechanism of heterochromatin recognition not resolved\", \"Only two mutations tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery that ZBTB24 directly activates CDCA7 transcription and that BTB domain loss causes embryonic lethality identified the first direct transcriptional target and demonstrated ZBTB24 is essential for development.\",\n      \"evidence\": \"Zbtb24 BTB-deletion mouse, transcriptomics, ChIP at CDCA7 promoter, ectopic expression rescue\",\n      \"pmids\": [\"27466202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DNA binding motif not yet defined\", \"How ZBTB24 connects to the DNA methylation machinery unresolved\", \"Role of CDCA7 in methylation maintenance not yet tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Genome-wide binding analysis revealed ZBTB24 co-occupies loci with DNMT3B, defined a 12-bp binding motif, and identified multiple direct target genes, while comparative methylomics placed ZBTB24, CDCA7, and HELLS in a shared heterochromatin methylation pathway distinct from DNMT3B.\",\n      \"evidence\": \"ChIP-seq for ZBTB24 and DNMT3B, motif discovery, genome-wide methylation profiling across all four ICF genotypes\",\n      \"pmids\": [\"30085123\", \"29659838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DNA recognition unknown\", \"Whether ZBTB24 directly recruits DNMT3B not tested\", \"How the ZBTB24-CDCA7-HELLS axis cooperates mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Crystal structure of ZF5-8 bound to cognate DNA defined the atomic basis of sequence-specific recognition, showed ICF2 mutations abolish binding, and domain dissection separated heterochromatin localization (AT-hook + ZF6) from transcriptional activation (ZF6-7) functions.\",\n      \"evidence\": \"X-ray crystallography, DNA binding assays with ICF2 mutants, domain deletion and promoter deletion analyses\",\n      \"pmids\": [\"31226215\", \"31561277\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of ZF1-4 undefined\", \"No full-length structure available\", \"In vivo validation of domain-specific functions limited\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery that ZBTB24 associates with PARP1, stimulates auto-PARylation, protects PAR chains from degradation, and facilitates LIG4/XRCC4-dependent NHEJ revealed a DNA methylation-independent function in DNA double-strand break repair and immunoglobulin class-switch recombination.\",\n      \"evidence\": \"Co-IP, PARylation assays, PAR binding assays, recruitment to DNA breaks, CSR assays in ICF2 patient cells and Zbtb24-deficient mice\",\n      \"pmids\": [\"32865561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of NHEJ defect versus methylation defect to ICF2 immunodeficiency unknown\", \"Whether ZBTB24 PAR binding and DNA binding are mutually exclusive unresolved\", \"Structural basis of PAR chain interaction not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Conditional hematopoietic knockout established that ZBTB24 controls Il5ra promoter methylation, linking its loss to IL-5Rα derepression, hyperactive CD19 signaling, and hypogammaglobulinemia—a mechanism confirmed by genetic epistasis with Cd19.\",\n      \"evidence\": \"Vav-Cre conditional KO mouse, methylation analysis at Il5ra, CD19 phosphorylation assay, Cd19 heterozygous rescue\",\n      \"pmids\": [\"37990035\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ZBTB24 directly binds the Il5ra promoter not shown\", \"Applicability to human ICF2 B cells not confirmed\", \"Role of other ZBTB24 targets in B cell dysfunction not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"B cell-specific deletion revealed that ZBTB24 is selectively required for B1 (not B2) plasma cell differentiation through maintenance of heme biosynthesis partially via mTORC1, uncovering a metabolic role.\",\n      \"evidence\": \"B cell-specific CRISPR KO mice, RNA-seq, hemin rescue of B1 differentiation defect\",\n      \"pmids\": [\"39277732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcriptional targets mediating heme pathway control not identified\", \"mTORC1 connection is partial and mechanism incomplete\", \"Single study; independent replication needed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Acute degradation and ICF-like mouse models demonstrated that ZBTB24 recruits DNMT3B to centromeric satellite DNA for both establishment and maintenance of methylation, and the ZBTB24-CDCA7-HELLS axis silences the Dux cluster to suppress 2C-like reprogramming, validated by site-specific re-methylation rescue.\",\n      \"evidence\": \"Auxin-inducible degron in mESCs, constitutive ICF-like mouse, ChIP at satellite DNA, Dux promoter re-methylation in ZBTB24/CDCA7/HELLS-disrupted mESCs\",\n      \"pmids\": [\"39562305\", \"40226918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ZBTB24 physically bridges DNMT3B to chromatin or acts indirectly through CDCA7/HELLS not resolved\", \"Relevance of 2C-like derepression to ICF2 patient phenotype unknown\", \"Contribution of individual satellite subfamilies to ICF2 centromeric instability not dissected\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identification of BTB domain missense variants causing protein instability and ICF2 established that the BTB domain is essential not only for protein-protein interactions but for overall ZBTB24 protein stability.\",\n      \"evidence\": \"Patient genotyping, protein stability assays, genome-wide methylation profiling matching verified ICF2 patterns\",\n      \"pmids\": [\"41359419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation pathway for unstable ZBTB24 not identified\", \"Whether BTB domain mutations affect specific interaction partners not tested\", \"Single study with limited number of variants\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include whether ZBTB24 directly bridges DNMT3B to target chromatin or acts exclusively via CDCA7/HELLS, the structural basis of PAR chain recognition by the zinc-finger domain, and the relative contributions of NHEJ defects versus DNA methylation loss to ICF2 immunodeficiency.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length ZBTB24 structure or ZBTB24-DNMT3B co-structure available\", \"Relative pathogenic contribution of NHEJ versus methylation defect in ICF2 unknown\", \"Whether ZBTB24 has additional transcription-independent roles beyond PARP1/NHEJ not explored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 6, 7, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 3, 4, 7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [1, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5, 12, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 4, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 10, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DNMT3B\", \"PARP1\", \"CDCA7\", \"HELLS\", \"LIG4\", \"XRCC4\"],\n    \"other_free_text\": []\n  }\n}\n```"}