Affinage

ZC3H14

Zinc finger CCCH domain-containing protein 14 · UniProt Q6PJT7

Length
736 aa
Mass
82.9 kDa
Annotated
2026-06-11
14 papers in source corpus 11 papers cited in narrative 11 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 6/6 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

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).

Mechanistic history

Synthesis pass · year-by-year structured walk · 11 steps
  1. 2009 Medium

    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

    PMID:19303045

    Open questions at the time
    • Does not establish a functional role at speckles
    • Single lab; relies on overexpressed tagged constructs
  2. 2011 High

    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

    PMID:21734151

    Open questions at the time
    • Did not identify specific transcript targets
    • Mechanism linking tail length to neuronal phenotype unresolved
  3. 2014 High

    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

    PMID:24671764

    Open questions at the time
    • Does not identify direct mRNA targets in mammalian neurons
    • Molecular partners mediating poly(A) control not defined
  4. 2015 Medium

    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

    PMID:25980665

    Open questions at the time
    • Causal mRNA targets driving axon defects unknown
    • Conservation of axon phenotype in mammals untested
  5. 2016 High

    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

    PMID:27563065

    Open questions at the time
    • Scope of transcriptome-wide targets not defined
    • Mechanism of nuclear retention not resolved at this stage
  6. 2017 High

    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

    PMID:28666327

    Open questions at the time
    • Causal chain from poly(A) dysregulation to memory deficit not dissected
    • Direct vs indirect basis of elevated synaptic proteins unclear
  7. 2018 High

    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

    PMID:29912477

    Open questions at the time
    • Stoichiometry and direct contacts within THO not defined
    • How THO association controls poly(A) tail length mechanistically unresolved
  8. 2020 Medium

    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

    PMID:33234594

    Open questions at the time
    • Directness of the PI3K interaction not structurally confirmed
    • How a nuclear RNA-binding protein contributes to cytoplasmic PI3K signaling unclear
  9. 2024 High

    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

    PMID:39461343

    Open questions at the time
    • Relationship between circRNA function and poly(A) regulation not integrated
    • Whether circRNA loss drives the spermatogenesis defect causally untested
  10. 2025 Medium

    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

    PMID:39898550

    Open questions at the time
    • Direct biochemical antagonism vs indirect effect not distinguished
    • Single lab, single publication
  11. 2026 Medium

    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)

    PMID:42146557

    Open questions at the time
    • Preprint, single lab
    • Whether synaptosomal ZC3H14 acts locally or reflects nuclear-origin effects unclear

Open questions

Synthesis pass · forward-looking unresolved questions
  • 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.
  • 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

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0003723 RNA binding 4
Localization
GO:0005634 nucleus 3 GO:0005654 nucleoplasm 2
Pathway
R-HSA-8953854 Metabolism of RNA 4
Partners
PABPN1PIK3THOCUPF1

Evidence

Reading pass · 11 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2011 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. 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 Proceedings of the National Academy of Sciences of the United States of America High 21734151
2009 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. Fluorescence microscopy/immunofluorescence of GFP-tagged isoforms in transfected cell lines; co-localization with SC35 antibody; fractionation experiments Gene Medium 19303045
2014 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. In vivo complementation assays in dNab2-null Drosophila expressing human ZC3H14; poly(A) tail length assays in neuronal cell lines depleted of ZC3H14 RNA (New York, N.Y.) High 24671764
2016 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. 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 The Journal of biological chemistry High 27563065
2017 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. Conditional exon-deletion mouse model; poly(A) tail length assays; behavioral working memory tests; proteomic analysis of hippocampal fractions Human molecular genetics High 28666327
2018 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. 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 Nucleic acids research High 29912477
2020 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. 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 The Journal of biological chemistry Medium 33234594
2024 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. 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 Molecular cell High 39461343
2025 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. 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 Nucleic acids research Medium 39898550
2026 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. Biochemical synaptosome preparation and western blotting from wild-type and Zc3h14Δ mice; fluorescence imaging of dendritic spines in cultured hippocampal neurons with ZC3H14 overexpression bioRxivpreprint Medium 42146557
2015 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. Neuron-specific dNab2 loss-of-function in Drosophila with mosaic analysis; axon projection imaging; behavioral courtship conditioning assay Developmental neurobiology Medium 25980665

Source papers

Stage 0 corpus · 14 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2011 Mutation of the conserved polyadenosine RNA binding protein, ZC3H14/dNab2, impairs neural function in Drosophila and humans. Proceedings of the National Academy of Sciences of the United States of America 71 21734151
2014 A conserved role for the zinc finger polyadenosine RNA binding protein, ZC3H14, in control of poly(A) tail length. RNA (New York, N.Y.) 50 24671764
2009 Splice variants of the human ZC3H14 gene generate multiple isoforms of a zinc finger polyadenosine RNA binding protein. Gene 41 19303045
2015 The Drosophila ortholog of the Zc3h14 RNA binding protein acts within neurons to pattern axon projection in the developing brain. Developmental neurobiology 32 25980665
2017 The RNA-binding protein, ZC3H14, is required for proper poly(A) tail length control, expression of synaptic proteins, and brain function in mice. Human molecular genetics 31 28666327
2018 The polyadenosine RNA-binding protein ZC3H14 interacts with the THO complex and coordinately regulates the processing of neuronal transcripts. Nucleic acids research 26 29912477
2016 The Polyadenosine RNA-binding Protein, Zinc Finger Cys3His Protein 14 (ZC3H14), Regulates the Pre-mRNA Processing of a Key ATP Synthase Subunit mRNA. The Journal of biological chemistry 23 27563065
2024 ZC3H14 facilitates backsplicing by binding to exon-intron boundary and 3' UTR. Molecular cell 22 39461343
2012 New kid on the ID block: neural functions of the Nab2/ZC3H14 class of Cys₃His tandem zinc-finger polyadenosine RNA binding proteins. RNA biology 16 22614829
2020 An endogenous PI3K interactome promoting astrocyte-mediated neuroprotection identifies a novel association with RNA-binding protein ZC3H14. The Journal of biological chemistry 9 33234594
2019 Downregulation of ZC3H14 driven by chromosome 14q31 deletion promotes hepatocellular carcinoma progression by activating integrin signaling. Carcinogenesis 7 30371740
2025 Antagonistic roles by the conserved nuclear poly(A)-binding proteins PABPN1 and ZC3H14 in nuclear RNA surveillance. Nucleic acids research 3 39898550
2019 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. Scientific reports 1 31406157
2026 The Polyadenosine RNA-Binding Protein ZC3H14 Localizes to Synapses and Regulates Synaptosomal CaMKIIα Levels. bioRxiv : the preprint server for biology 0 42146557

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