{"gene":"ZNF335","run_date":"2026-06-11T09:02:07","timeline":{"discoveries":[{"year":2012,"finding":"ZNF335/NIF-1 is a component of a vertebrate-specific trithorax H3K4-methylation complex and directly regulates REST/NRSF (a master regulator of neural gene expression and cell fate) as well as other essential neural-specific genes. Conditional knockout in mice leads to severely reduced cortical size, and RNAi studies show ZNF335 is essential for neural progenitor self-renewal, neurogenesis, and neuronal differentiation.","method":"Conditional knockout mouse, RNA interference, postmortem human tissue studies, biochemical complex identification","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (conditional KO, RNAi, complex biochemistry) in a high-profile study; establishes pathway placement and complex membership","pmids":["23178126"],"is_preprint":false},{"year":2002,"finding":"ZNF335/NIF-1 (NRC-interacting factor 1) is a 1,342-amino-acid nuclear protein containing six Cys2/His2 zinc fingers, an N-terminal acidic domain, and a C-terminal leucine zipper-like motif. It interacts in vivo and in vitro with the nuclear hormone receptor coactivator NRC, and markedly enhances ligand-dependent transcriptional activation by nuclear hormone receptors, c-Fos, and c-Jun, acting as a cotransducer rather than a direct receptor-binding coactivator.","method":"Yeast two-hybrid cloning, in vivo and in vitro binding assays, domain mapping, transcriptional reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal in vivo/in vitro interaction assays plus functional transcriptional activation assays with domain mapping in a dedicated mechanistic study","pmids":["12215545"],"is_preprint":false},{"year":2009,"finding":"ZNF335/NIF-1 is the core scaffold of a ~1.5 MDa nuclear protein complex containing Ash2L, RbBP5, WDR5, HCF-1, DBC-1, and EMSY. Although the complex contains Ash2L/RbBP5/WDR5, it exhibits histone H3 methyltransferase activity that modifies a residue other than H3-Lys-4. DBC-1 and EMSY are integral components required for nuclear receptor-mediated transcription of RAR-alpha target genes Sox9 and HoxA1.","method":"In-solution proteolysis/mass spectrometry, histone methyltransferase activity assays, siRNA knockdown, quantitative PCR","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS-based complex identification combined with enzymatic activity assays and functional siRNA validation, multiple orthogonal methods in one study","pmids":["19131338"],"is_preprint":false},{"year":2008,"finding":"CCR4/CNOT6 and RCD1/CNOT9, members of the CCR4-NOT complex, interact in vivo and in vitro with ZNF335/NIF-1 and potentiate nuclear receptor transcriptional activity. The CCR4-enhanced activation of nuclear receptors is dependent on ZNF335/NIF-1; siRNA-mediated knockdown of NIF-1 blocks the ligand-dependent potentiating effect of CCR4.","method":"Co-immunoprecipitation (in vivo and in vitro), siRNA knockdown, quantitative PCR, transcriptional reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal in vivo/in vitro binding, functional knockdown with defined phenotypic rescue, multiple orthogonal methods","pmids":["18180299"],"is_preprint":false},{"year":2016,"finding":"Zfp335 (mouse ZNF335) binds DNA via recognition of two distinct consensus motifs using separate zinc finger clusters. A disease-associated R1092W mutation selectively disrupts binding at a specific subset of target sites by disrupting one of the two motif recognition interactions.","method":"ChIP-seq, DNA binding assays, mutagenesis (R1092W), transcriptional reporter assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct DNA binding characterization with mutagenesis and ChIP-seq, identifying specific mechanism of target selection","pmids":["27401554"],"is_preprint":false},{"year":2014,"finding":"ZNF335/NIF-1 undergoes CRM1/exportin-dependent nucleocytoplasmic shuttling regulated by the Cdk5 activator p35. p35 interacts with NIF-1 and promotes its nuclear export; blocking CRM1-dependent nuclear export of p35 attenuates nuclear accumulation of NIF-1. This regulation is independent of Cdk5 kinase activity.","method":"Co-immunoprecipitation, nuclear export signal mutagenesis, pharmacological CRM1 inhibition (leptomycin B), subcellular fractionation/imaging","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus mutagenesis and chemical inhibition in single lab; independent replication not reported","pmids":["25329792"],"is_preprint":false},{"year":2015,"finding":"ZNF335/NIF-1 is expressed in nuclei of developing rat cortical neurons and is required for neurite outgrowth. Knockdown of NIF-1 attenuates neurite outgrowth in cultured cortical neurons and RA-treated Neuro-2a cells. Activity-induced Ca2+ influx stimulates nuclear localization of NIF-1 and activity-dependent gene transcription; NIF-1 knockdown reduces this transcriptional upregulation.","method":"siRNA knockdown, live-cell imaging/subcellular localization, neurite outgrowth assay, gene expression analysis in primary cortical neurons","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct localization and functional knockdown with defined cellular phenotype (neurite outgrowth), single lab","pmids":["25573434"],"is_preprint":false},{"year":2007,"finding":"ZNF335/NIF-1 interacts with Trap80 (a mediator complex member), and this interaction bridges NRC to p53, thereby enabling NRC to function as a coactivator for p53-dependent transcription.","method":"Co-immunoprecipitation, transcriptional reporter assays","journal":"Molecular endocrinology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP result described as part of a broader study on NRC; NIF-1/Trap80 interaction not independently validated","pmids":["17536006"],"is_preprint":false},{"year":2023,"finding":"Zfp335 (mouse ZNF335) controls the differentiation of effector regulatory T cells (eTregs) by directly targeting the fatty acid oxidation enzyme Hadha, thereby regulating oxidative phosphorylation and mitochondrial activity. Zfp335 deletion in Tregs abolishes eTreg differentiation, impairs Treg-suppressive function, and causes lethal autoimmune inflammation. A positive correlation between ZNF335 and HADHA expression was confirmed in human eTregs.","method":"Conditional knockout (Treg-specific), single-cell RNA-seq, ChIP (direct target identification of Hadha), metabolic assays (oxidative phosphorylation, FAO), human eTreg expression correlation","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined immune phenotype, scRNA-seq, direct transcriptional target identification by ChIP, metabolic functional assays, and human validation — multiple orthogonal methods","pmids":["37843279"],"is_preprint":false},{"year":2024,"finding":"Mice carrying a hypomorphic missense mutation in Zfp335 (R1092W) have significantly lower non-HDL cholesterol levels and blunted LDL statin response compared to wild-type mice, establishing ZNF335 as a modulator of plasma cholesterol levels and statin response in vivo.","method":"Hypomorphic mouse model (Zfp335-R1092W), plasma lipoprotein profiling, statin diet challenge experiment, LCL transcriptomic correlation with human clinical trial data","journal":"Genome medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with defined metabolic phenotype plus correlated human LCL data; single lab, no independent replication","pmids":["39061094"],"is_preprint":false},{"year":2025,"finding":"Loss of ZNF335 in a genome-wide CRISPR/Cas9 screen results in formation of nucleoplasmic condensates, linking ZNF335 function to nuclear condensate biology in the context of neurodevelopmental disease.","method":"Genome-wide CRISPR/Cas9 screen, high-content imaging, confocal microscopy","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single screen result from preprint, phenotypic condensate observation without molecular mechanism; not yet peer-reviewed","pmids":["bio_10.1101_2025.06.07.658469"],"is_preprint":true},{"year":2025,"finding":"A minigene assay demonstrated that an intronic ZNF335 variant (c.1665+6T>A) causes aberrant splicing, resulting in significantly reduced ZNF335 protein levels in a patient with secondary microcephaly.","method":"Minigene splicing assay, exome sequencing, Western blot for protein levels","journal":"Congenital anomalies","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct experimental validation of splicing mechanism by minigene assay with protein level confirmation; single case report","pmids":["40583037"],"is_preprint":false}],"current_model":"ZNF335/NIF-1 is a nuclear C2H2 zinc finger protein that acts as a transcriptional cotransducer by scaffolding a vertebrate-specific trithorax H3K4-methylation complex; it directly regulates REST/NRSF and neural-specific genes to control neural progenitor self-renewal and neurogenesis, enhances nuclear hormone receptor-mediated transcription through interactions with NRC, CCR4-NOT components, and a ~1.5 MDa complex containing Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY, binds DNA through two distinct zinc finger clusters each recognizing a separate consensus motif, undergoes p35-regulated CRM1-dependent nucleocytoplasmic shuttling, drives effector Treg differentiation by directly targeting the FAO enzyme Hadha, and modulates plasma cholesterol and statin response in vivo."},"narrative":{"mechanistic_narrative":"ZNF335 (NIF-1) is a nuclear C2H2 zinc finger protein that functions as a transcriptional cotransducer and chromatin-complex scaffold controlling neural progenitor self-renewal, neurogenesis, and additional differentiation programs [PMID:23178126, PMID:12215545]. It is the core scaffold of a ~1.5 MDa nuclear complex containing Ash2L, RbBP5, WDR5, HCF-1, DBC-1, and EMSY that carries histone methyltransferase activity, and it is a component of a vertebrate-specific trithorax H3K4-methylation complex that directly regulates the neural master regulator REST/NRSF and other neural-specific genes [PMID:23178126, PMID:19131338]. ZNF335 acts as a cotransducer that potentiates ligand-dependent transcription by nuclear hormone receptors and other factors through the coactivator NRC, and its activity is required for the transcriptional enhancement contributed by CCR4-NOT components CNOT6/CNOT9 [PMID:12215545, PMID:18180299]. It binds DNA through two distinct zinc finger clusters that each recognize a separate consensus motif, and a disease-associated R1092W mutation selectively disrupts one of these recognition events to alter target-site occupancy [PMID:27401554]. Beyond neurodevelopment, ZNF335 directly targets the fatty acid oxidation enzyme Hadha to drive effector regulatory T cell differentiation and suppressive function, with its loss causing lethal autoimmune inflammation [PMID:37843279]. In humans, loss-of-function variants that reduce ZNF335 protein levels cause microcephaly [PMID:40583037].","teleology":[{"year":2002,"claim":"Defined ZNF335 as a nuclear zinc finger protein that boosts nuclear hormone receptor transcription not by binding receptors directly but as a cotransducer through the coactivator NRC, establishing its first molecular role.","evidence":"Yeast two-hybrid cloning, reciprocal in vivo/in vitro binding, domain mapping, and reporter assays in cells","pmids":["12215545"],"confidence":"High","gaps":["Did not define the chromatin complex or enzymatic activity it scaffolds","No DNA-binding specificity established"]},{"year":2007,"claim":"Extended the cotransducer model by linking NIF-1 to the Mediator subunit Trap80, bridging NRC to p53-dependent transcription.","evidence":"Co-immunoprecipitation and transcriptional reporter assays","pmids":["17536006"],"confidence":"Low","gaps":["Single co-IP within a broader NRC-focused study; NIF-1/Trap80 interaction not independently validated","Functional significance for endogenous p53 targets untested"]},{"year":2008,"claim":"Showed CCR4-NOT components physically engage NIF-1 and require it for nuclear receptor potentiation, placing ZNF335 as an obligate node in this coactivation pathway.","evidence":"Reciprocal in vivo/in vitro co-IP, siRNA knockdown with phenotypic dependence, qPCR, reporter assays","pmids":["18180299"],"confidence":"High","gaps":["Mechanism by which CCR4-NOT enhances activity via ZNF335 unresolved","Direct target genes not mapped genome-wide"]},{"year":2009,"claim":"Identified ZNF335 as the core scaffold of a ~1.5 MDa complex with Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY and showed the complex methylates a histone residue other than H3K4, defining its biochemical context for nuclear receptor target transcription.","evidence":"In-solution proteolysis/MS complex identification, histone methyltransferase activity assays, siRNA knockdown, qPCR","pmids":["19131338"],"confidence":"High","gaps":["Exact methylated histone residue not identified","Catalytic subunit responsible for the activity not assigned"]},{"year":2012,"claim":"Established ZNF335's developmental function: as part of a vertebrate-specific trithorax H3K4-methylation complex it directly regulates REST/NRSF and neural genes, and is essential for neural progenitor self-renewal and cortical size.","evidence":"Conditional KO mouse, RNAi, postmortem human tissue, biochemical complex identification","pmids":["23178126"],"confidence":"High","gaps":["Apparent discrepancy between H3K4 and non-H3K4 methyltransferase activity across studies not reconciled","Direct genomic binding sites not yet mapped"]},{"year":2014,"claim":"Revealed that NIF-1 subcellular distribution is dynamically controlled by CRM1-dependent export driven by the Cdk5 activator p35, independent of Cdk5 kinase activity.","evidence":"Co-IP, NES mutagenesis, leptomycin B inhibition, subcellular fractionation/imaging (single lab)","pmids":["25329792"],"confidence":"Medium","gaps":["Not independently replicated","Functional consequence of shuttling for transcriptional output untested"]},{"year":2015,"claim":"Connected ZNF335 to neuronal maturation by showing it is required for neurite outgrowth and that activity-induced Ca2+ influx drives its nuclear localization and activity-dependent transcription.","evidence":"siRNA knockdown, live-cell localization, neurite outgrowth assays, gene expression in primary cortical neurons (single lab)","pmids":["25573434"],"confidence":"Medium","gaps":["Direct activity-dependent target genes not defined","Link between Ca2+ signaling and ZNF335 import mechanism unresolved"]},{"year":2016,"claim":"Defined the DNA-recognition logic: ZNF335 uses two separate zinc finger clusters to read two distinct motifs, and the disease-linked R1092W mutation selectively abolishes one interaction, explaining target-selective dysfunction.","evidence":"ChIP-seq, DNA-binding assays, R1092W mutagenesis, reporter assays in mouse","pmids":["27401554"],"confidence":"High","gaps":["How the two motif-binding modes integrate at composite sites unclear","Relationship of binding modes to specific cofactor recruitment not established"]},{"year":2023,"claim":"Expanded ZNF335 function beyond neurodevelopment by showing it directly targets the FAO enzyme Hadha to license effector Treg differentiation and metabolism, with loss causing fatal autoimmunity.","evidence":"Treg-specific conditional KO, scRNA-seq, ChIP for direct Hadha targeting, OXPHOS/FAO metabolic assays, human eTreg correlation","pmids":["37843279"],"confidence":"High","gaps":["Whether the chromatin complex defined in neural cells operates identically at Hadha untested","Full immune target repertoire not catalogued"]},{"year":2024,"claim":"Linked ZNF335 to systemic metabolism by showing the R1092W hypomorph lowers non-HDL cholesterol and blunts statin response in vivo.","evidence":"Zfp335-R1092W mouse, plasma lipoprotein profiling, statin challenge, LCL transcriptomic correlation with human trial data (single lab)","pmids":["39061094"],"confidence":"Medium","gaps":["Direct ZNF335 target genes mediating the cholesterol phenotype not identified","Not independently replicated"]},{"year":2025,"claim":"Provided direct human disease evidence that a splicing variant reducing ZNF335 protein causes secondary microcephaly.","evidence":"Minigene splicing assay, exome sequencing, Western blot in a single patient case","pmids":["40583037"],"confidence":"Medium","gaps":["Single case report","Mechanistic link from reduced protein to microcephaly phenotype inferred, not demonstrated"]},{"year":2025,"claim":"Suggested a previously unappreciated role in nuclear organization, as ZNF335 loss produces nucleoplasmic condensates in a genome-wide screen.","evidence":"Genome-wide CRISPR/Cas9 screen with high-content/confocal imaging (preprint)","pmids":[],"confidence":"Low","gaps":["Preprint, not peer-reviewed","No molecular mechanism connecting ZNF335 to condensate biology","Relationship to its transcriptional/chromatin functions unknown"]},{"year":null,"claim":"The molecular identity of the histone residue and catalytic subunit responsible for the ZNF335 complex's methyltransferase activity, and how its DNA-binding modes select context-specific transcriptional and metabolic programs, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["Methylated histone residue unassigned","Genome-wide direct targets across cell types incompletely mapped","Mechanistic basis of tissue-specific functions (neural vs. Treg vs. lipid) unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,3,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,3,7]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,6]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,3,8]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8]}],"complexes":["ZNF335/Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY methyltransferase complex","vertebrate-specific trithorax H3K4-methylation complex"],"partners":["NRC","ASH2L","RBBP5","WDR5","HCF-1","CNOT6","CNOT9","P35"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H4Z2","full_name":"Zinc finger protein 335","aliases":["NRC-interacting factor 1","NIF-1"],"length_aa":1342,"mass_kda":144.9,"function":"Component or associated component of some histone methyltransferase complexes may regulate transcription through recruitment of those complexes on gene promoters (PubMed:19131338, PubMed:23178126). Enhances ligand-dependent transcriptional activation by nuclear hormone receptors (PubMed:12215545, PubMed:18180299, PubMed:19131338). Plays an important role in neural progenitor cell proliferation and self-renewal through the regulation of specific genes involved brain development, including REST (PubMed:23178126). Also controls the expression of genes involved in somatic development and regulates, for instance, lymphoblast proliferation (PubMed:23178126)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9H4Z2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ZNF335","classification":"Common Essential","n_dependent_lines":924,"n_total_lines":1208,"dependency_fraction":0.7649006622516556},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ZNF335","total_profiled":1310},"omim":[{"mim_id":"615095","title":"MICROCEPHALY 10, PRIMARY, AUTOSOMAL RECESSIVE; MCPH10","url":"https://www.omim.org/entry/615095"},{"mim_id":"610827","title":"ZINC FINGER PROTEIN 335; ZNF335","url":"https://www.omim.org/entry/610827"},{"mim_id":"600571","title":"RE1-SILENCING TRANSCRIPTION FACTOR; REST","url":"https://www.omim.org/entry/600571"},{"mim_id":"251200","title":"MICROCEPHALY 1, PRIMARY, AUTOSOMAL RECESSIVE; MCPH1","url":"https://www.omim.org/entry/251200"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ZNF335"},"hgnc":{"alias_symbol":["bA465L10.2","NIF-1"],"prev_symbol":[]},"alphafold":{"accession":"Q9H4Z2","domains":[{"cath_id":"-","chopping":"677-713","consensus_level":"medium","plddt":76.4081,"start":677,"end":713},{"cath_id":"3.30.160.60","chopping":"1020-1127","consensus_level":"medium","plddt":78.1449,"start":1020,"end":1127},{"cath_id":"-","chopping":"1147-1189_1324-1342","consensus_level":"medium","plddt":66.1792,"start":1147,"end":1342},{"cath_id":"3.30.160","chopping":"236-266","consensus_level":"high","plddt":83.171,"start":236,"end":266}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H4Z2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H4Z2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H4Z2-F1-predicted_aligned_error_v6.png","plddt_mean":51.03},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZNF335","jax_strain_url":"https://www.jax.org/strain/search?query=ZNF335"},"sequence":{"accession":"Q9H4Z2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H4Z2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H4Z2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H4Z2"}},"corpus_meta":[{"pmid":"25951892","id":"PMC_25951892","title":"Molecular 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Conditional knockout in mice leads to severely reduced cortical size, and RNAi studies show ZNF335 is essential for neural progenitor self-renewal, neurogenesis, and neuronal differentiation.\",\n      \"method\": \"Conditional knockout mouse, RNA interference, postmortem human tissue studies, biochemical complex identification\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (conditional KO, RNAi, complex biochemistry) in a high-profile study; establishes pathway placement and complex membership\",\n      \"pmids\": [\"23178126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ZNF335/NIF-1 (NRC-interacting factor 1) is a 1,342-amino-acid nuclear protein containing six Cys2/His2 zinc fingers, an N-terminal acidic domain, and a C-terminal leucine zipper-like motif. It interacts in vivo and in vitro with the nuclear hormone receptor coactivator NRC, and markedly enhances ligand-dependent transcriptional activation by nuclear hormone receptors, c-Fos, and c-Jun, acting as a cotransducer rather than a direct receptor-binding coactivator.\",\n      \"method\": \"Yeast two-hybrid cloning, in vivo and in vitro binding assays, domain mapping, transcriptional reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal in vivo/in vitro interaction assays plus functional transcriptional activation assays with domain mapping in a dedicated mechanistic study\",\n      \"pmids\": [\"12215545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZNF335/NIF-1 is the core scaffold of a ~1.5 MDa nuclear protein complex containing Ash2L, RbBP5, WDR5, HCF-1, DBC-1, and EMSY. Although the complex contains Ash2L/RbBP5/WDR5, it exhibits histone H3 methyltransferase activity that modifies a residue other than H3-Lys-4. DBC-1 and EMSY are integral components required for nuclear receptor-mediated transcription of RAR-alpha target genes Sox9 and HoxA1.\",\n      \"method\": \"In-solution proteolysis/mass spectrometry, histone methyltransferase activity assays, siRNA knockdown, quantitative PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS-based complex identification combined with enzymatic activity assays and functional siRNA validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"19131338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CCR4/CNOT6 and RCD1/CNOT9, members of the CCR4-NOT complex, interact in vivo and in vitro with ZNF335/NIF-1 and potentiate nuclear receptor transcriptional activity. The CCR4-enhanced activation of nuclear receptors is dependent on ZNF335/NIF-1; siRNA-mediated knockdown of NIF-1 blocks the ligand-dependent potentiating effect of CCR4.\",\n      \"method\": \"Co-immunoprecipitation (in vivo and in vitro), siRNA knockdown, quantitative PCR, transcriptional reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal in vivo/in vitro binding, functional knockdown with defined phenotypic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"18180299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Zfp335 (mouse ZNF335) binds DNA via recognition of two distinct consensus motifs using separate zinc finger clusters. A disease-associated R1092W mutation selectively disrupts binding at a specific subset of target sites by disrupting one of the two motif recognition interactions.\",\n      \"method\": \"ChIP-seq, DNA binding assays, mutagenesis (R1092W), transcriptional reporter assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct DNA binding characterization with mutagenesis and ChIP-seq, identifying specific mechanism of target selection\",\n      \"pmids\": [\"27401554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ZNF335/NIF-1 undergoes CRM1/exportin-dependent nucleocytoplasmic shuttling regulated by the Cdk5 activator p35. p35 interacts with NIF-1 and promotes its nuclear export; blocking CRM1-dependent nuclear export of p35 attenuates nuclear accumulation of NIF-1. This regulation is independent of Cdk5 kinase activity.\",\n      \"method\": \"Co-immunoprecipitation, nuclear export signal mutagenesis, pharmacological CRM1 inhibition (leptomycin B), subcellular fractionation/imaging\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus mutagenesis and chemical inhibition in single lab; independent replication not reported\",\n      \"pmids\": [\"25329792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZNF335/NIF-1 is expressed in nuclei of developing rat cortical neurons and is required for neurite outgrowth. Knockdown of NIF-1 attenuates neurite outgrowth in cultured cortical neurons and RA-treated Neuro-2a cells. Activity-induced Ca2+ influx stimulates nuclear localization of NIF-1 and activity-dependent gene transcription; NIF-1 knockdown reduces this transcriptional upregulation.\",\n      \"method\": \"siRNA knockdown, live-cell imaging/subcellular localization, neurite outgrowth assay, gene expression analysis in primary cortical neurons\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct localization and functional knockdown with defined cellular phenotype (neurite outgrowth), single lab\",\n      \"pmids\": [\"25573434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ZNF335/NIF-1 interacts with Trap80 (a mediator complex member), and this interaction bridges NRC to p53, thereby enabling NRC to function as a coactivator for p53-dependent transcription.\",\n      \"method\": \"Co-immunoprecipitation, transcriptional reporter assays\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP result described as part of a broader study on NRC; NIF-1/Trap80 interaction not independently validated\",\n      \"pmids\": [\"17536006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Zfp335 (mouse ZNF335) controls the differentiation of effector regulatory T cells (eTregs) by directly targeting the fatty acid oxidation enzyme Hadha, thereby regulating oxidative phosphorylation and mitochondrial activity. Zfp335 deletion in Tregs abolishes eTreg differentiation, impairs Treg-suppressive function, and causes lethal autoimmune inflammation. A positive correlation between ZNF335 and HADHA expression was confirmed in human eTregs.\",\n      \"method\": \"Conditional knockout (Treg-specific), single-cell RNA-seq, ChIP (direct target identification of Hadha), metabolic assays (oxidative phosphorylation, FAO), human eTreg expression correlation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined immune phenotype, scRNA-seq, direct transcriptional target identification by ChIP, metabolic functional assays, and human validation — multiple orthogonal methods\",\n      \"pmids\": [\"37843279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Mice carrying a hypomorphic missense mutation in Zfp335 (R1092W) have significantly lower non-HDL cholesterol levels and blunted LDL statin response compared to wild-type mice, establishing ZNF335 as a modulator of plasma cholesterol levels and statin response in vivo.\",\n      \"method\": \"Hypomorphic mouse model (Zfp335-R1092W), plasma lipoprotein profiling, statin diet challenge experiment, LCL transcriptomic correlation with human clinical trial data\",\n      \"journal\": \"Genome medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with defined metabolic phenotype plus correlated human LCL data; single lab, no independent replication\",\n      \"pmids\": [\"39061094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of ZNF335 in a genome-wide CRISPR/Cas9 screen results in formation of nucleoplasmic condensates, linking ZNF335 function to nuclear condensate biology in the context of neurodevelopmental disease.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 screen, high-content imaging, confocal microscopy\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single screen result from preprint, phenotypic condensate observation without molecular mechanism; not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.06.07.658469\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A minigene assay demonstrated that an intronic ZNF335 variant (c.1665+6T>A) causes aberrant splicing, resulting in significantly reduced ZNF335 protein levels in a patient with secondary microcephaly.\",\n      \"method\": \"Minigene splicing assay, exome sequencing, Western blot for protein levels\",\n      \"journal\": \"Congenital anomalies\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct experimental validation of splicing mechanism by minigene assay with protein level confirmation; single case report\",\n      \"pmids\": [\"40583037\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZNF335/NIF-1 is a nuclear C2H2 zinc finger protein that acts as a transcriptional cotransducer by scaffolding a vertebrate-specific trithorax H3K4-methylation complex; it directly regulates REST/NRSF and neural-specific genes to control neural progenitor self-renewal and neurogenesis, enhances nuclear hormone receptor-mediated transcription through interactions with NRC, CCR4-NOT components, and a ~1.5 MDa complex containing Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY, binds DNA through two distinct zinc finger clusters each recognizing a separate consensus motif, undergoes p35-regulated CRM1-dependent nucleocytoplasmic shuttling, drives effector Treg differentiation by directly targeting the FAO enzyme Hadha, and modulates plasma cholesterol and statin response in vivo.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZNF335 (NIF-1) is a nuclear C2H2 zinc finger protein that functions as a transcriptional cotransducer and chromatin-complex scaffold controlling neural progenitor self-renewal, neurogenesis, and additional differentiation programs [#0, #1]. It is the core scaffold of a ~1.5 MDa nuclear complex containing Ash2L, RbBP5, WDR5, HCF-1, DBC-1, and EMSY that carries histone methyltransferase activity, and it is a component of a vertebrate-specific trithorax H3K4-methylation complex that directly regulates the neural master regulator REST/NRSF and other neural-specific genes [#0, #2]. ZNF335 acts as a cotransducer that potentiates ligand-dependent transcription by nuclear hormone receptors and other factors through the coactivator NRC, and its activity is required for the transcriptional enhancement contributed by CCR4-NOT components CNOT6/CNOT9 [#1, #3]. It binds DNA through two distinct zinc finger clusters that each recognize a separate consensus motif, and a disease-associated R1092W mutation selectively disrupts one of these recognition events to alter target-site occupancy [#4]. Beyond neurodevelopment, ZNF335 directly targets the fatty acid oxidation enzyme Hadha to drive effector regulatory T cell differentiation and suppressive function, with its loss causing lethal autoimmune inflammation [#8]. In humans, loss-of-function variants that reduce ZNF335 protein levels cause microcephaly [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined ZNF335 as a nuclear zinc finger protein that boosts nuclear hormone receptor transcription not by binding receptors directly but as a cotransducer through the coactivator NRC, establishing its first molecular role.\",\n      \"evidence\": \"Yeast two-hybrid cloning, reciprocal in vivo/in vitro binding, domain mapping, and reporter assays in cells\",\n      \"pmids\": [\"12215545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the chromatin complex or enzymatic activity it scaffolds\", \"No DNA-binding specificity established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended the cotransducer model by linking NIF-1 to the Mediator subunit Trap80, bridging NRC to p53-dependent transcription.\",\n      \"evidence\": \"Co-immunoprecipitation and transcriptional reporter assays\",\n      \"pmids\": [\"17536006\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-IP within a broader NRC-focused study; NIF-1/Trap80 interaction not independently validated\", \"Functional significance for endogenous p53 targets untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed CCR4-NOT components physically engage NIF-1 and require it for nuclear receptor potentiation, placing ZNF335 as an obligate node in this coactivation pathway.\",\n      \"evidence\": \"Reciprocal in vivo/in vitro co-IP, siRNA knockdown with phenotypic dependence, qPCR, reporter assays\",\n      \"pmids\": [\"18180299\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CCR4-NOT enhances activity via ZNF335 unresolved\", \"Direct target genes not mapped genome-wide\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified ZNF335 as the core scaffold of a ~1.5 MDa complex with Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY and showed the complex methylates a histone residue other than H3K4, defining its biochemical context for nuclear receptor target transcription.\",\n      \"evidence\": \"In-solution proteolysis/MS complex identification, histone methyltransferase activity assays, siRNA knockdown, qPCR\",\n      \"pmids\": [\"19131338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact methylated histone residue not identified\", \"Catalytic subunit responsible for the activity not assigned\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established ZNF335's developmental function: as part of a vertebrate-specific trithorax H3K4-methylation complex it directly regulates REST/NRSF and neural genes, and is essential for neural progenitor self-renewal and cortical size.\",\n      \"evidence\": \"Conditional KO mouse, RNAi, postmortem human tissue, biochemical complex identification\",\n      \"pmids\": [\"23178126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apparent discrepancy between H3K4 and non-H3K4 methyltransferase activity across studies not reconciled\", \"Direct genomic binding sites not yet mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed that NIF-1 subcellular distribution is dynamically controlled by CRM1-dependent export driven by the Cdk5 activator p35, independent of Cdk5 kinase activity.\",\n      \"evidence\": \"Co-IP, NES mutagenesis, leptomycin B inhibition, subcellular fractionation/imaging (single lab)\",\n      \"pmids\": [\"25329792\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Not independently replicated\", \"Functional consequence of shuttling for transcriptional output untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected ZNF335 to neuronal maturation by showing it is required for neurite outgrowth and that activity-induced Ca2+ influx drives its nuclear localization and activity-dependent transcription.\",\n      \"evidence\": \"siRNA knockdown, live-cell localization, neurite outgrowth assays, gene expression in primary cortical neurons (single lab)\",\n      \"pmids\": [\"25573434\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct activity-dependent target genes not defined\", \"Link between Ca2+ signaling and ZNF335 import mechanism unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the DNA-recognition logic: ZNF335 uses two separate zinc finger clusters to read two distinct motifs, and the disease-linked R1092W mutation selectively abolishes one interaction, explaining target-selective dysfunction.\",\n      \"evidence\": \"ChIP-seq, DNA-binding assays, R1092W mutagenesis, reporter assays in mouse\",\n      \"pmids\": [\"27401554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the two motif-binding modes integrate at composite sites unclear\", \"Relationship of binding modes to specific cofactor recruitment not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Expanded ZNF335 function beyond neurodevelopment by showing it directly targets the FAO enzyme Hadha to license effector Treg differentiation and metabolism, with loss causing fatal autoimmunity.\",\n      \"evidence\": \"Treg-specific conditional KO, scRNA-seq, ChIP for direct Hadha targeting, OXPHOS/FAO metabolic assays, human eTreg correlation\",\n      \"pmids\": [\"37843279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the chromatin complex defined in neural cells operates identically at Hadha untested\", \"Full immune target repertoire not catalogued\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked ZNF335 to systemic metabolism by showing the R1092W hypomorph lowers non-HDL cholesterol and blunts statin response in vivo.\",\n      \"evidence\": \"Zfp335-R1092W mouse, plasma lipoprotein profiling, statin challenge, LCL transcriptomic correlation with human trial data (single lab)\",\n      \"pmids\": [\"39061094\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ZNF335 target genes mediating the cholesterol phenotype not identified\", \"Not independently replicated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided direct human disease evidence that a splicing variant reducing ZNF335 protein causes secondary microcephaly.\",\n      \"evidence\": \"Minigene splicing assay, exome sequencing, Western blot in a single patient case\",\n      \"pmids\": [\"40583037\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case report\", \"Mechanistic link from reduced protein to microcephaly phenotype inferred, not demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Suggested a previously unappreciated role in nuclear organization, as ZNF335 loss produces nucleoplasmic condensates in a genome-wide screen.\",\n      \"evidence\": \"Genome-wide CRISPR/Cas9 screen with high-content/confocal imaging (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"No molecular mechanism connecting ZNF335 to condensate biology\", \"Relationship to its transcriptional/chromatin functions unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of the histone residue and catalytic subunit responsible for the ZNF335 complex's methyltransferase activity, and how its DNA-binding modes select context-specific transcriptional and metabolic programs, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Methylated histone residue unassigned\", \"Genome-wide direct targets across cell types incompletely mapped\", \"Mechanistic basis of tissue-specific functions (neural vs. Treg vs. lipid) unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 3, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 3, 7]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 3, 8]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"ZNF335/Ash2L/RbBP5/WDR5/HCF-1/DBC-1/EMSY methyltransferase complex\",\n      \"vertebrate-specific trithorax H3K4-methylation complex\"\n    ],\n    \"partners\": [\n      \"NRC\",\n      \"Ash2L\",\n      \"RbBP5\",\n      \"WDR5\",\n      \"HCF-1\",\n      \"CNOT6\",\n      \"CNOT9\",\n      \"p35\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}