{"gene":"ZC3H14","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2011,"finding":"ZC3H14/dNab2 binds polyadenosine RNA and restricts bulk poly(A) tail length in vivo; loss of the Drosophila ortholog dNab2 causes extended poly(A) tails, impairs development, and is required in neurons for normal locomotion and flight.","method":"Biochemical poly(A) tail length assays in Drosophila dNab2 mutants; genetic loss-of-function with locomotion/flight phenotypic readouts; colocalization of rodent ZC3H14 protein with poly(A) RNA in hippocampal neurons","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (biochemical poly(A) assay, genetic mutants, in situ colocalization) replicated across organisms","pmids":["21734151"],"is_preprint":false},{"year":2009,"finding":"ZC3H14 isoforms 1–3 (containing classical nuclear localization signals in exons 7 and 11) localize to nuclear speckles that co-localize with the splicing factor SC35, while isoform 4 (lacking those NLS motifs) localizes to the cytoplasm; both sets of isoforms share the C-terminal zinc finger polyadenosine RNA-binding domain.","method":"Fluorescence microscopy/immunofluorescence of GFP-tagged isoforms in transfected cell lines; co-localization with SC35 antibody; fractionation experiments","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional domain mapping in multiple isoforms, single lab","pmids":["19303045"],"is_preprint":false},{"year":2014,"finding":"Human ZC3H14 functionally substitutes for Drosophila dNab2 in fly neurons, rescuing developmental and locomotion defects; ZC3H14 controls poly(A) tail length in neuronal cells, establishing a conserved role for this zinc finger polyadenosine RNA-binding protein class in poly(A) tail regulation.","method":"In vivo complementation assays in dNab2-null Drosophila expressing human ZC3H14; poly(A) tail length assays in neuronal cell lines depleted of ZC3H14","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — cross-species functional rescue plus biochemical poly(A) length assay, multiple orthogonal approaches","pmids":["24671764"],"is_preprint":false},{"year":2016,"finding":"ZC3H14 binds ATP5G1 pre-mRNA in the nucleus and is required for its proper nuclear processing and retention; knockdown of ZC3H14 reduces ATP5G1 steady-state mRNA levels, increases cytoplasmic pre-mRNA accumulation, and decreases cellular ATP levels with concomitant mitochondrial fragmentation; double knockdown with the NMD factor UPF1 rescues ATP5G1 transcript levels, indicating ZC3H14 loss triggers NMD of this transcript.","method":"RNA immunoprecipitation (RIP) to show ZC3H14 binds ATP5G1 pre-mRNA; siRNA knockdown with RT-qPCR and subcellular fractionation; double knockdown epistasis with UPF1; ATP level assays; mitochondrial morphology imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RIP, fractionation, epistasis knockdown, metabolic assay) in a single focused study","pmids":["27563065"],"is_preprint":false},{"year":2017,"finding":"Loss of ZC3H14 in a mouse knockout model (Zc3h14Δex13/Δex13) causes extended bulk poly(A) tail length in vivo, enlarged lateral ventricles, impaired working memory, and elevated synaptic proteins including CaMK2α in the hippocampus.","method":"Conditional exon-deletion mouse model; poly(A) tail length assays; behavioral working memory tests; proteomic analysis of hippocampal fractions","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with multiple readouts (biochemical, structural, behavioral, proteomic), single lab but rigorous multimodal characterization","pmids":["28666327"],"is_preprint":false},{"year":2018,"finding":"ZC3H14 physically interacts with components of the THO complex in the brain; co-depletion of ZC3H14 or THO components each causes extended bulk poly(A) tail length and decreased steady-state levels of the neuronal transcripts Atp5g1 and Psd95 with accumulation of their pre-mRNA in the cytoplasm, demonstrating coordinated regulation of mRNA processing.","method":"Unbiased mass spectrometry interactome from brain tissue; reciprocal co-immunoprecipitation of ZC3H14 and THO components; siRNA knockdown of ZC3H14 and THO factors with poly(A) assays, RT-qPCR, and subcellular fractionation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP confirmed by MS, complemented by functional knockdown with multiple transcript readouts, single lab","pmids":["29912477"],"is_preprint":false},{"year":2020,"finding":"ZC3H14 co-immunoprecipitates with endogenous PI3K in neuronal cells exposed to astrocyte conditioned media (ACM), and this PI3K–ZC3H14 interaction is required for PDGF-induced neuroprotection; the interaction is also present in primary retinal ganglion cells.","method":"Endogenous PI3K immunoprecipitation followed by MS/MS proteomic analysis; validation by targeted co-IP in neuronal cells and primary retinal ganglion cells; functional neuroprotection assays with ZC3H14 manipulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP validated by MS and in primary cells, functional link established, single lab","pmids":["33234594"],"is_preprint":false},{"year":2024,"finding":"ZC3H14 promotes circRNA biogenesis (backsplicing) by binding to 3′ and 5′ exon-intron boundaries and 3′ UTRs of cognate mRNAs through dimerization and association with the spliceosome; yeast Nab2 knockout shows significantly reduced circRNA levels, and Zc3h14−/− mice exhibit disrupted spermatogenesis with reduced testicular circRNA levels.","method":"Genome-wide CRISPR knockout screen; CLIP-seq or binding assays for exon-intron boundary and 3′ UTR occupancy; yeast Nab2 KO with circRNA quantification; Zc3h14−/− mouse model with spermatogenesis and circRNA level analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen plus cross-species KO validation (yeast and mouse) plus biochemical binding characterization, multiple orthogonal methods","pmids":["39461343"],"is_preprint":false},{"year":2025,"finding":"ZC3H14 functions antagonistically to PABPN1 and the PAXT (poly(A)-tail exosome targeting) connection in nuclear RNA surveillance: PABPN1 retains polyadenylated lncRNAs in the nucleus for exosome-mediated decay, whereas ZC3H14 opposes this retention/decay pathway, with ZC3H14 loss leading to altered cytoplasmic accumulation of target lncRNAs.","method":"Loss-of-function (siRNA/KD) of PABPN1 and ZC3H14 individually and in combination; subcellular fractionation and RNA quantification of lncRNA targets; epistasis between ZC3H14 and PAXT/exosome components","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with fractionation and RNA quantification, single lab, single publication","pmids":["39898550"],"is_preprint":false},{"year":2026,"finding":"ZC3H14 is present within synaptosomal fractions of mouse brain; loss of ZC3H14 (Zc3h14Δ mice) significantly increases CaMKIIα protein levels in synaptosomal fractions; overexpression of ZC3H14 in cultured hippocampal neurons increases overall dendritic spine density.","method":"Biochemical synaptosome preparation and western blotting from wild-type and Zc3h14Δ mice; fluorescence imaging of dendritic spines in cultured hippocampal neurons with ZC3H14 overexpression","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean KO mouse model with biochemical fractionation and morphological readout, but preprint and single lab","pmids":["42146557"],"is_preprint":true},{"year":2015,"finding":"dNab2 (ZC3H14 ortholog) is cell-autonomously required within Kenyon neurons for proper axon projection into mushroom bodies; loss of dNab2 causes aberrant midline crossing and defective branching of mushroom body axons and impairs short-term memory in a courtship conditioning assay.","method":"Neuron-specific dNab2 loss-of-function in Drosophila with mosaic analysis; axon projection imaging; behavioral courtship conditioning assay","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-autonomous genetic KO with morphological and behavioral readouts, single lab","pmids":["25980665"],"is_preprint":false}],"current_model":"ZC3H14 is an evolutionarily conserved nuclear zinc finger (CCCH-type) polyadenosine RNA-binding protein that controls poly(A) tail length and pre-mRNA processing: it restricts bulk poly(A) tail elongation, promotes proper nuclear retention and processing of select transcripts (e.g., ATP5G1, Psd95) by associating with the THO complex, facilitates circRNA biogenesis via binding at exon-intron boundaries and 3′ UTRs through dimerization and spliceosome recruitment, and acts antagonistically to PABPN1 in nuclear lncRNA surveillance; in neurons it localizes to synapses where its loss elevates CaMKIIα levels, and its absence in mice causes impaired working memory, enlarged lateral ventricles, and dysregulated synaptic protein expression."},"narrative":{"mechanistic_narrative":"ZC3H14 is an evolutionarily conserved nuclear CCCH-type zinc finger polyadenosine RNA-binding protein that governs poly(A) tail length and nuclear pre-mRNA processing, and is required for normal neuronal function [PMID:21734151, PMID:24671764, PMID:28666327]. Through its C-terminal zinc finger domain it binds polyadenosine RNA and restricts bulk poly(A) tail elongation in vivo, a function so conserved that human ZC3H14 rescues the developmental and locomotion defects of Drosophila lacking the dNab2 ortholog [PMID:21734151, PMID:24671764]. The major isoforms localize to nuclear speckles co-staining with the splicing factor SC35, while an isoform lacking the nuclear localization signals is cytoplasmic [PMID:19303045]. Mechanistically, ZC3H14 associates with the THO complex to promote proper nuclear processing and retention of select transcripts including ATP5G1 and Psd95; its loss causes cytoplasmic accumulation of unprocessed pre-mRNA and degradation of ATP5G1 mRNA via UPF1-dependent NMD, with downstream loss of cellular ATP and mitochondrial fragmentation [PMID:27563065, PMID:29912477]. It additionally promotes circRNA backsplicing by binding exon-intron boundaries and 3' UTRs through dimerization and spliceosome recruitment, and acts antagonistically to PABPN1 in nuclear lncRNA surveillance [PMID:39461343, PMID:39898550]. In mice, deletion produces extended bulk poly(A) tails, enlarged lateral ventricles, impaired working memory, elevated synaptic CaMKIIα, and disrupted spermatogenesis, while in Drosophila dNab2 is required cell-autonomously for mushroom body axon projection and short-term memory [PMID:28666327, PMID:39461343, PMID:25980665].","teleology":[{"year":2009,"claim":"Defining where ZC3H14 acts established it as a predominantly nuclear, isoform-dependent factor positioned at sites of splicing.","evidence":"Immunofluorescence of GFP-tagged isoforms and SC35 co-localization in transfected cells, with fractionation","pmids":["19303045"],"confidence":"Medium","gaps":["Does not establish a functional role at speckles","Single lab; relies on overexpressed tagged constructs"]},{"year":2011,"claim":"Identifying ZC3H14/dNab2 as a polyadenosine RNA binder that restricts poly(A) tail length defined its core biochemical activity and tied it to neuronal physiology.","evidence":"Poly(A) tail length assays in Drosophila dNab2 mutants, genetic loss-of-function with locomotion/flight readouts, and protein/poly(A) RNA colocalization in rodent hippocampal neurons","pmids":["21734151"],"confidence":"High","gaps":["Did not identify specific transcript targets","Mechanism linking tail length to neuronal phenotype unresolved"]},{"year":2014,"claim":"Cross-species complementation showed the poly(A)-regulatory function is conserved from fly to human, validating ZC3H14 as the functional ortholog.","evidence":"In vivo rescue of dNab2-null Drosophila by human ZC3H14 plus poly(A) tail assays in ZC3H14-depleted neuronal cell lines","pmids":["24671764"],"confidence":"High","gaps":["Does not identify direct mRNA targets in mammalian neurons","Molecular partners mediating poly(A) control not defined"]},{"year":2015,"claim":"Linking dNab2 to axon guidance demonstrated a cell-autonomous neurodevelopmental requirement beyond bulk poly(A) regulation.","evidence":"Neuron-specific loss-of-function with mosaic analysis, axon projection imaging, and courtship conditioning in Drosophila","pmids":["25980665"],"confidence":"Medium","gaps":["Causal mRNA targets driving axon defects unknown","Conservation of axon phenotype in mammals untested"]},{"year":2016,"claim":"Defining ATP5G1 as a target showed ZC3H14 ensures proper nuclear processing/retention of specific transcripts and that its loss diverts pre-mRNA to cytoplasmic NMD with metabolic consequences.","evidence":"RIP, siRNA knockdown with fractionation and RT-qPCR, UPF1 epistasis, ATP assays, and mitochondrial imaging","pmids":["27563065"],"confidence":"High","gaps":["Scope of transcriptome-wide targets not defined","Mechanism of nuclear retention not resolved at this stage"]},{"year":2017,"claim":"A mouse knockout established the in vivo phenotypic consequences of ZC3H14 loss, connecting extended poly(A) tails to brain structural, behavioral, and synaptic protein defects.","evidence":"Exon-deletion mouse model with poly(A) assays, working memory behavior, and hippocampal proteomics","pmids":["28666327"],"confidence":"High","gaps":["Causal chain from poly(A) dysregulation to memory deficit not dissected","Direct vs indirect basis of elevated synaptic proteins unclear"]},{"year":2018,"claim":"Identifying the THO complex as a physical partner provided the molecular machinery through which ZC3H14 coordinates processing and retention of neuronal transcripts.","evidence":"Brain interactome by mass spectrometry, reciprocal Co-IP, and co-depletion knockdowns with poly(A), RT-qPCR, and fractionation readouts","pmids":["29912477"],"confidence":"High","gaps":["Stoichiometry and direct contacts within THO not defined","How THO association controls poly(A) tail length mechanistically unresolved"]},{"year":2020,"claim":"A cytoplasmic PI3K interaction linked ZC3H14 to neuroprotective signaling, distinct from its nuclear RNA roles.","evidence":"Endogenous PI3K IP-MS, targeted Co-IP in neuronal cells and primary retinal ganglion cells, and neuroprotection assays","pmids":["33234594"],"confidence":"Medium","gaps":["Directness of the PI3K interaction not structurally confirmed","How a nuclear RNA-binding protein contributes to cytoplasmic PI3K signaling unclear"]},{"year":2024,"claim":"Defining a role in circRNA biogenesis expanded ZC3H14 function to backsplicing, mediated by exon-intron/3'UTR binding, dimerization, and spliceosome recruitment.","evidence":"Genome-wide CRISPR screen, binding/CLIP assays, yeast Nab2 KO circRNA quantification, and Zc3h14-/- mouse spermatogenesis and circRNA analysis","pmids":["39461343"],"confidence":"High","gaps":["Relationship between circRNA function and poly(A) regulation not integrated","Whether circRNA loss drives the spermatogenesis defect causally untested"]},{"year":2025,"claim":"Placing ZC3H14 in opposition to PABPN1/PAXT positioned it as an antagonist of nuclear lncRNA retention and exosome-mediated decay.","evidence":"Individual and combined siRNA of PABPN1 and ZC3H14, fractionation/RNA quantification, and epistasis with PAXT/exosome components","pmids":["39898550"],"confidence":"Medium","gaps":["Direct biochemical antagonism vs indirect effect not distinguished","Single lab, single publication"]},{"year":2026,"claim":"Localizing ZC3H14 to synaptosomes and linking it to spine density and CaMKIIα refined its role at the synapse.","evidence":"Synaptosome fractionation and western blotting in WT and Zc3h14Δ mice plus dendritic spine imaging with overexpression in cultured neurons (preprint)","pmids":["42146557"],"confidence":"Medium","gaps":["Preprint, single lab","Whether synaptosomal ZC3H14 acts locally or reflects nuclear-origin effects unclear"]},{"year":null,"claim":"How ZC3H14 mechanistically couples poly(A) tail control, THO-dependent retention, circRNA backsplicing, and lncRNA surveillance into a unified regulatory logic, and which of these activities drives each neuronal and reproductive phenotype, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of ZC3H14 on RNA/THO","Transcriptome-wide direct target set and their phenotypic contributions not integrated","Mechanism of antagonism with PABPN1/PAXT not biochemically defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2,3,7]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,3]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,3,7,8]}],"complexes":[],"partners":["THOC","PABPN1","UPF1","PIK3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6PJT7","full_name":"Zinc finger CCCH domain-containing protein 14","aliases":["Mammalian suppressor of tau pathology-2","MSUT-2","Renal carcinoma antigen NY-REN-37"],"length_aa":736,"mass_kda":82.9,"function":"RNA-binding protein involved in the biogenesis of circular RNAs (circRNAs), which are produced by back-splicing circularization of pre-mRNAs (PubMed:39461343). Acts by binding to both exon-intron boundary and 3'-UTR of pre-mRNAs to promote circRNA biogenesis through dimerization and the association with the spliceosome (PubMed:39461343). Required for spermatogenesis via involvement in circRNA biogenesis (PubMed:39461343). Regulates the pre-mRNA processing of ATP5MC1; preventing its degradation (PubMed:27563065). Also binds the poly(A) tail of mRNAs; controlling poly(A) length in neuronal cells (PubMed:17630287, PubMed:24671764)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q6PJT7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZC3H14","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"DDX39B","stoichiometry":0.2},{"gene":"RBM33","stoichiometry":0.2},{"gene":"RBM39","stoichiometry":0.2},{"gene":"RBM8A","stoichiometry":0.2},{"gene":"SF3A1","stoichiometry":0.2},{"gene":"SNRPA","stoichiometry":0.2},{"gene":"SNRPB","stoichiometry":0.2},{"gene":"SNRPF","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ZC3H14","total_profiled":1310},"omim":[{"mim_id":"617125","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 56; MRT56","url":"https://www.omim.org/entry/617125"},{"mim_id":"613279","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 14: ZC3H14","url":"https://www.omim.org/entry/613279"},{"mim_id":"157140","title":"MICROTUBULE-ASSOCIATED PROTEIN TAU; MAPT","url":"https://www.omim.org/entry/157140"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nuclear speckles","reliability":"Enhanced"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Nucleoli rim","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":162.0}],"url":"https://www.proteinatlas.org/search/ZC3H14"},"hgnc":{"alias_symbol":["FLJ11806","UKp68","NY-REN-37"],"prev_symbol":[]},"alphafold":{"accession":"Q6PJT7","domains":[{"cath_id":"4.10.1000.40","chopping":"599-661","consensus_level":"medium","plddt":84.5649,"start":599,"end":661},{"cath_id":"1.20.1390","chopping":"2-76","consensus_level":"high","plddt":89.9951,"start":2,"end":76}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6PJT7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6PJT7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6PJT7-F1-predicted_aligned_error_v6.png","plddt_mean":56.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZC3H14","jax_strain_url":"https://www.jax.org/strain/search?query=ZC3H14"},"sequence":{"accession":"Q6PJT7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6PJT7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6PJT7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6PJT7"}},"corpus_meta":[{"pmid":"21734151","id":"PMC_21734151","title":"Mutation of the conserved polyadenosine RNA binding protein, ZC3H14/dNab2, impairs neural function in Drosophila and humans.","date":"2011","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/21734151","citation_count":71,"is_preprint":false},{"pmid":"24671764","id":"PMC_24671764","title":"A conserved role for the zinc finger polyadenosine RNA binding protein, ZC3H14, in control of poly(A) tail length.","date":"2014","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/24671764","citation_count":50,"is_preprint":false},{"pmid":"19303045","id":"PMC_19303045","title":"Splice variants of the human ZC3H14 gene generate multiple isoforms of a zinc finger polyadenosine RNA binding protein.","date":"2009","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/19303045","citation_count":41,"is_preprint":false},{"pmid":"25980665","id":"PMC_25980665","title":"The Drosophila ortholog of the Zc3h14 RNA binding protein acts within neurons to pattern axon projection in the developing brain.","date":"2015","source":"Developmental neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/25980665","citation_count":32,"is_preprint":false},{"pmid":"28666327","id":"PMC_28666327","title":"The RNA-binding protein, ZC3H14, is required for proper poly(A) tail length control, expression of synaptic proteins, and brain function in mice.","date":"2017","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28666327","citation_count":31,"is_preprint":false},{"pmid":"29912477","id":"PMC_29912477","title":"The polyadenosine RNA-binding protein ZC3H14 interacts with the THO complex and coordinately regulates the processing of neuronal transcripts.","date":"2018","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/29912477","citation_count":26,"is_preprint":false},{"pmid":"27563065","id":"PMC_27563065","title":"The Polyadenosine RNA-binding Protein, Zinc Finger Cys3His Protein 14 (ZC3H14), Regulates the Pre-mRNA Processing of a Key ATP Synthase Subunit mRNA.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27563065","citation_count":23,"is_preprint":false},{"pmid":"39461343","id":"PMC_39461343","title":"ZC3H14 facilitates backsplicing by binding to exon-intron boundary and 3' UTR.","date":"2024","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/39461343","citation_count":22,"is_preprint":false},{"pmid":"22614829","id":"PMC_22614829","title":"New kid on the ID block: neural functions of the Nab2/ZC3H14 class of Cys₃His tandem zinc-finger polyadenosine RNA binding proteins.","date":"2012","source":"RNA biology","url":"https://pubmed.ncbi.nlm.nih.gov/22614829","citation_count":16,"is_preprint":false},{"pmid":"33234594","id":"PMC_33234594","title":"An endogenous PI3K interactome promoting astrocyte-mediated neuroprotection identifies a novel association with RNA-binding protein ZC3H14.","date":"2020","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33234594","citation_count":9,"is_preprint":false},{"pmid":"30371740","id":"PMC_30371740","title":"Downregulation of ZC3H14 driven by chromosome 14q31 deletion promotes hepatocellular carcinoma progression by activating integrin signaling.","date":"2019","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/30371740","citation_count":7,"is_preprint":false},{"pmid":"39898550","id":"PMC_39898550","title":"Antagonistic roles by the conserved nuclear poly(A)-binding proteins PABPN1 and ZC3H14 in nuclear RNA surveillance.","date":"2025","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/39898550","citation_count":3,"is_preprint":false},{"pmid":"31406157","id":"PMC_31406157","title":"Targeted sequencing of linkage region in Dominican families implicates PRIMA1 and the SPATA7-PTPN21-ZC3H14-EML5-TTC8 locus in carotid-intima media thickness and atherosclerotic events.","date":"2019","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/31406157","citation_count":1,"is_preprint":false},{"pmid":"42146557","id":"PMC_42146557","title":"The Polyadenosine RNA-Binding Protein ZC3H14 Localizes to Synapses and Regulates Synaptosomal CaMKIIα Levels.","date":"2026","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/42146557","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9261,"output_tokens":3051,"usd":0.036774,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10495,"output_tokens":3583,"usd":0.071025,"stage2_stop_reason":"end_turn"},"total_usd":0.107799,"stage1_batch_id":"msgbatch_01UT1AahFPCAyn2uVweS7A9z","stage2_batch_id":"msgbatch_01HuKWtKNT4Pqj1bc8eEP5RV","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2011,\n      \"finding\": \"ZC3H14/dNab2 binds polyadenosine RNA and restricts bulk poly(A) tail length in vivo; loss of the Drosophila ortholog dNab2 causes extended poly(A) tails, impairs development, and is required in neurons for normal locomotion and flight.\",\n      \"method\": \"Biochemical poly(A) tail length assays in Drosophila dNab2 mutants; genetic loss-of-function with locomotion/flight phenotypic readouts; colocalization of rodent ZC3H14 protein with poly(A) RNA in hippocampal neurons\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (biochemical poly(A) assay, genetic mutants, in situ colocalization) replicated across organisms\",\n      \"pmids\": [\"21734151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ZC3H14 isoforms 1–3 (containing classical nuclear localization signals in exons 7 and 11) localize to nuclear speckles that co-localize with the splicing factor SC35, while isoform 4 (lacking those NLS motifs) localizes to the cytoplasm; both sets of isoforms share the C-terminal zinc finger polyadenosine RNA-binding domain.\",\n      \"method\": \"Fluorescence microscopy/immunofluorescence of GFP-tagged isoforms in transfected cell lines; co-localization with SC35 antibody; fractionation experiments\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional domain mapping in multiple isoforms, single lab\",\n      \"pmids\": [\"19303045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human ZC3H14 functionally substitutes for Drosophila dNab2 in fly neurons, rescuing developmental and locomotion defects; ZC3H14 controls poly(A) tail length in neuronal cells, establishing a conserved role for this zinc finger polyadenosine RNA-binding protein class in poly(A) tail regulation.\",\n      \"method\": \"In vivo complementation assays in dNab2-null Drosophila expressing human ZC3H14; poly(A) tail length assays in neuronal cell lines depleted of ZC3H14\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cross-species functional rescue plus biochemical poly(A) length assay, multiple orthogonal approaches\",\n      \"pmids\": [\"24671764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ZC3H14 binds ATP5G1 pre-mRNA in the nucleus and is required for its proper nuclear processing and retention; knockdown of ZC3H14 reduces ATP5G1 steady-state mRNA levels, increases cytoplasmic pre-mRNA accumulation, and decreases cellular ATP levels with concomitant mitochondrial fragmentation; double knockdown with the NMD factor UPF1 rescues ATP5G1 transcript levels, indicating ZC3H14 loss triggers NMD of this transcript.\",\n      \"method\": \"RNA immunoprecipitation (RIP) to show ZC3H14 binds ATP5G1 pre-mRNA; siRNA knockdown with RT-qPCR and subcellular fractionation; double knockdown epistasis with UPF1; ATP level assays; mitochondrial morphology imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RIP, fractionation, epistasis knockdown, metabolic assay) in a single focused study\",\n      \"pmids\": [\"27563065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Loss of ZC3H14 in a mouse knockout model (Zc3h14Δex13/Δex13) causes extended bulk poly(A) tail length in vivo, enlarged lateral ventricles, impaired working memory, and elevated synaptic proteins including CaMK2α in the hippocampus.\",\n      \"method\": \"Conditional exon-deletion mouse model; poly(A) tail length assays; behavioral working memory tests; proteomic analysis of hippocampal fractions\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with multiple readouts (biochemical, structural, behavioral, proteomic), single lab but rigorous multimodal characterization\",\n      \"pmids\": [\"28666327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZC3H14 physically interacts with components of the THO complex in the brain; co-depletion of ZC3H14 or THO components each causes extended bulk poly(A) tail length and decreased steady-state levels of the neuronal transcripts Atp5g1 and Psd95 with accumulation of their pre-mRNA in the cytoplasm, demonstrating coordinated regulation of mRNA processing.\",\n      \"method\": \"Unbiased mass spectrometry interactome from brain tissue; reciprocal co-immunoprecipitation of ZC3H14 and THO components; siRNA knockdown of ZC3H14 and THO factors with poly(A) assays, RT-qPCR, and subcellular fractionation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP confirmed by MS, complemented by functional knockdown with multiple transcript readouts, single lab\",\n      \"pmids\": [\"29912477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZC3H14 co-immunoprecipitates with endogenous PI3K in neuronal cells exposed to astrocyte conditioned media (ACM), and this PI3K–ZC3H14 interaction is required for PDGF-induced neuroprotection; the interaction is also present in primary retinal ganglion cells.\",\n      \"method\": \"Endogenous PI3K immunoprecipitation followed by MS/MS proteomic analysis; validation by targeted co-IP in neuronal cells and primary retinal ganglion cells; functional neuroprotection assays with ZC3H14 manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP validated by MS and in primary cells, functional link established, single lab\",\n      \"pmids\": [\"33234594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZC3H14 promotes circRNA biogenesis (backsplicing) by binding to 3′ and 5′ exon-intron boundaries and 3′ UTRs of cognate mRNAs through dimerization and association with the spliceosome; yeast Nab2 knockout shows significantly reduced circRNA levels, and Zc3h14−/− mice exhibit disrupted spermatogenesis with reduced testicular circRNA levels.\",\n      \"method\": \"Genome-wide CRISPR knockout screen; CLIP-seq or binding assays for exon-intron boundary and 3′ UTR occupancy; yeast Nab2 KO with circRNA quantification; Zc3h14−/− mouse model with spermatogenesis and circRNA level analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen plus cross-species KO validation (yeast and mouse) plus biochemical binding characterization, multiple orthogonal methods\",\n      \"pmids\": [\"39461343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ZC3H14 functions antagonistically to PABPN1 and the PAXT (poly(A)-tail exosome targeting) connection in nuclear RNA surveillance: PABPN1 retains polyadenylated lncRNAs in the nucleus for exosome-mediated decay, whereas ZC3H14 opposes this retention/decay pathway, with ZC3H14 loss leading to altered cytoplasmic accumulation of target lncRNAs.\",\n      \"method\": \"Loss-of-function (siRNA/KD) of PABPN1 and ZC3H14 individually and in combination; subcellular fractionation and RNA quantification of lncRNA targets; epistasis between ZC3H14 and PAXT/exosome components\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with fractionation and RNA quantification, single lab, single publication\",\n      \"pmids\": [\"39898550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ZC3H14 is present within synaptosomal fractions of mouse brain; loss of ZC3H14 (Zc3h14Δ mice) significantly increases CaMKIIα protein levels in synaptosomal fractions; overexpression of ZC3H14 in cultured hippocampal neurons increases overall dendritic spine density.\",\n      \"method\": \"Biochemical synaptosome preparation and western blotting from wild-type and Zc3h14Δ mice; fluorescence imaging of dendritic spines in cultured hippocampal neurons with ZC3H14 overexpression\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean KO mouse model with biochemical fractionation and morphological readout, but preprint and single lab\",\n      \"pmids\": [\"42146557\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"dNab2 (ZC3H14 ortholog) is cell-autonomously required within Kenyon neurons for proper axon projection into mushroom bodies; loss of dNab2 causes aberrant midline crossing and defective branching of mushroom body axons and impairs short-term memory in a courtship conditioning assay.\",\n      \"method\": \"Neuron-specific dNab2 loss-of-function in Drosophila with mosaic analysis; axon projection imaging; behavioral courtship conditioning assay\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-autonomous genetic KO with morphological and behavioral readouts, single lab\",\n      \"pmids\": [\"25980665\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZC3H14 is an evolutionarily conserved nuclear zinc finger (CCCH-type) polyadenosine RNA-binding protein that controls poly(A) tail length and pre-mRNA processing: it restricts bulk poly(A) tail elongation, promotes proper nuclear retention and processing of select transcripts (e.g., ATP5G1, Psd95) by associating with the THO complex, facilitates circRNA biogenesis via binding at exon-intron boundaries and 3′ UTRs through dimerization and spliceosome recruitment, and acts antagonistically to PABPN1 in nuclear lncRNA surveillance; in neurons it localizes to synapses where its loss elevates CaMKIIα levels, and its absence in mice causes impaired working memory, enlarged lateral ventricles, and dysregulated synaptic protein expression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZC3H14 is an evolutionarily conserved nuclear CCCH-type zinc finger polyadenosine RNA-binding protein that governs poly(A) tail length and nuclear pre-mRNA processing, and is required for normal neuronal function [#0, #2, #4]. Through its C-terminal zinc finger domain it binds polyadenosine RNA and restricts bulk poly(A) tail elongation in vivo, a function so conserved that human ZC3H14 rescues the developmental and locomotion defects of Drosophila lacking the dNab2 ortholog [#0, #2]. The major isoforms localize to nuclear speckles co-staining with the splicing factor SC35, while an isoform lacking the nuclear localization signals is cytoplasmic [#1]. Mechanistically, ZC3H14 associates with the THO complex to promote proper nuclear processing and retention of select transcripts including ATP5G1 and Psd95; its loss causes cytoplasmic accumulation of unprocessed pre-mRNA and degradation of ATP5G1 mRNA via UPF1-dependent NMD, with downstream loss of cellular ATP and mitochondrial fragmentation [#3, #5]. It additionally promotes circRNA backsplicing by binding exon-intron boundaries and 3' UTRs through dimerization and spliceosome recruitment, and acts antagonistically to PABPN1 in nuclear lncRNA surveillance [#7, #8]. In mice, deletion produces extended bulk poly(A) tails, enlarged lateral ventricles, impaired working memory, elevated synaptic CaMKIIα, and disrupted spermatogenesis, while in Drosophila dNab2 is required cell-autonomously for mushroom body axon projection and short-term memory [#4, #7, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Defining where ZC3H14 acts established it as a predominantly nuclear, isoform-dependent factor positioned at sites of splicing.\",\n      \"evidence\": \"Immunofluorescence of GFP-tagged isoforms and SC35 co-localization in transfected cells, with fractionation\",\n      \"pmids\": [\"19303045\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish a functional role at speckles\", \"Single lab; relies on overexpressed tagged constructs\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying ZC3H14/dNab2 as a polyadenosine RNA binder that restricts poly(A) tail length defined its core biochemical activity and tied it to neuronal physiology.\",\n      \"evidence\": \"Poly(A) tail length assays in Drosophila dNab2 mutants, genetic loss-of-function with locomotion/flight readouts, and protein/poly(A) RNA colocalization in rodent hippocampal neurons\",\n      \"pmids\": [\"21734151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify specific transcript targets\", \"Mechanism linking tail length to neuronal phenotype unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Cross-species complementation showed the poly(A)-regulatory function is conserved from fly to human, validating ZC3H14 as the functional ortholog.\",\n      \"evidence\": \"In vivo rescue of dNab2-null Drosophila by human ZC3H14 plus poly(A) tail assays in ZC3H14-depleted neuronal cell lines\",\n      \"pmids\": [\"24671764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify direct mRNA targets in mammalian neurons\", \"Molecular partners mediating poly(A) control not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linking dNab2 to axon guidance demonstrated a cell-autonomous neurodevelopmental requirement beyond bulk poly(A) regulation.\",\n      \"evidence\": \"Neuron-specific loss-of-function with mosaic analysis, axon projection imaging, and courtship conditioning in Drosophila\",\n      \"pmids\": [\"25980665\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal mRNA targets driving axon defects unknown\", \"Conservation of axon phenotype in mammals untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining ATP5G1 as a target showed ZC3H14 ensures proper nuclear processing/retention of specific transcripts and that its loss diverts pre-mRNA to cytoplasmic NMD with metabolic consequences.\",\n      \"evidence\": \"RIP, siRNA knockdown with fractionation and RT-qPCR, UPF1 epistasis, ATP assays, and mitochondrial imaging\",\n      \"pmids\": [\"27563065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Scope of transcriptome-wide targets not defined\", \"Mechanism of nuclear retention not resolved at this stage\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A mouse knockout established the in vivo phenotypic consequences of ZC3H14 loss, connecting extended poly(A) tails to brain structural, behavioral, and synaptic protein defects.\",\n      \"evidence\": \"Exon-deletion mouse model with poly(A) assays, working memory behavior, and hippocampal proteomics\",\n      \"pmids\": [\"28666327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from poly(A) dysregulation to memory deficit not dissected\", \"Direct vs indirect basis of elevated synaptic proteins unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying the THO complex as a physical partner provided the molecular machinery through which ZC3H14 coordinates processing and retention of neuronal transcripts.\",\n      \"evidence\": \"Brain interactome by mass spectrometry, reciprocal Co-IP, and co-depletion knockdowns with poly(A), RT-qPCR, and fractionation readouts\",\n      \"pmids\": [\"29912477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and direct contacts within THO not defined\", \"How THO association controls poly(A) tail length mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A cytoplasmic PI3K interaction linked ZC3H14 to neuroprotective signaling, distinct from its nuclear RNA roles.\",\n      \"evidence\": \"Endogenous PI3K IP-MS, targeted Co-IP in neuronal cells and primary retinal ganglion cells, and neuroprotection assays\",\n      \"pmids\": [\"33234594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Directness of the PI3K interaction not structurally confirmed\", \"How a nuclear RNA-binding protein contributes to cytoplasmic PI3K signaling unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining a role in circRNA biogenesis expanded ZC3H14 function to backsplicing, mediated by exon-intron/3'UTR binding, dimerization, and spliceosome recruitment.\",\n      \"evidence\": \"Genome-wide CRISPR screen, binding/CLIP assays, yeast Nab2 KO circRNA quantification, and Zc3h14-/- mouse spermatogenesis and circRNA analysis\",\n      \"pmids\": [\"39461343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between circRNA function and poly(A) regulation not integrated\", \"Whether circRNA loss drives the spermatogenesis defect causally untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placing ZC3H14 in opposition to PABPN1/PAXT positioned it as an antagonist of nuclear lncRNA retention and exosome-mediated decay.\",\n      \"evidence\": \"Individual and combined siRNA of PABPN1 and ZC3H14, fractionation/RNA quantification, and epistasis with PAXT/exosome components\",\n      \"pmids\": [\"39898550\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical antagonism vs indirect effect not distinguished\", \"Single lab, single publication\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Localizing ZC3H14 to synaptosomes and linking it to spine density and CaMKIIα refined its role at the synapse.\",\n      \"evidence\": \"Synaptosome fractionation and western blotting in WT and Zc3h14Δ mice plus dendritic spine imaging with overexpression in cultured neurons (preprint)\",\n      \"pmids\": [\"42146557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab\", \"Whether synaptosomal ZC3H14 acts locally or reflects nuclear-origin effects unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ZC3H14 mechanistically couples poly(A) tail control, THO-dependent retention, circRNA backsplicing, and lncRNA surveillance into a unified regulatory logic, and which of these activities drives each neuronal and reproductive phenotype, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of ZC3H14 on RNA/THO\", \"Transcriptome-wide direct target set and their phenotypic contributions not integrated\", \"Mechanism of antagonism with PABPN1/PAXT not biochemically defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2, 3, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 3, 7, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"THOC\", \"PABPN1\", \"UPF1\", \"PIK3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}