Affinage

CELF4

CUGBP Elav-like family member 4 · UniProt Q9BZC1

Length
486 aa
Mass
52.0 kDa
Annotated
2026-06-09
21 papers in source corpus 14 papers cited in narrative 15 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

CELF4 is a neuronal RNA-binding protein that controls gene expression at the levels of alternative splicing, mRNA stability, and translation, and functions as a brake on neuronal excitability across the central and peripheral nervous systems (PMID:23209433, PMID:21745337, PMID:41089293). Sequence-specific RNA binding is mediated by its N-terminal RNA recognition motifs: either RRM1 or RRM2 is sufficient to bind intronic muscle-specific elements (MSEs) flanking the cardiac troponin T (cTNT/TNNT2) alternative exon, and this activity drives MSE-dependent exon inclusion (PMID:14973222), with the same locus regulated in human cardiac tissue (PMID:26811534). Transcriptome-wide, CELF4 binds a large fraction of mRNAs with strong preference for 3' UTRs, and its loss impairs target mRNA stability and translational availability and causes synaptic-transmission transcripts to mislocalize to the neuropil (PMID:23209433). In the brain it is expressed predominantly in excitatory neurons, where it specifically restrains excitatory neurotransmission; one key target is Scn8a mRNA, and CELF4 deficiency elevates Nav1.6 protein at the axon initial segment, increases persistent sodium current, and lowers the action potential threshold (PMID:21745337, PMID:23090952). Loss of CELF4 lowers seizure threshold and produces spontaneous seizures in mice (PMID:17677002, PMID:21745337), reduces dendritic spine density (PMID:35306363), and disrupts subplate synapse balance during prenatal neocortical development (PMID:37758766); the same negative regulation of excitability operates in peripheral sensory neurons, where CELF4 suppresses DRG and spinal pain-pathway excitability and pain-mediator expression (PMID:41089293, PMID:42207381). Heterozygous loss-of-function and N-terminal RRM missense variants in CELF4 cause a human neurodevelopmental disorder with intellectual disability, seizures, and obesity, establishing that RRM-dependent RNA binding is essential for normal neurodevelopment (PMID:40108438).

Mechanistic history

Synthesis pass · year-by-year structured walk · 14 steps
  1. 2004 High

    Established the molecular basis of CELF4 RNA recognition and its function as a splicing activator by mapping which domains bind RNA and drive exon inclusion.

    Evidence Systematic deletion/truncation mutagenesis with in vitro RNA binding and in vivo splicing assays on the cTNT MSE substrate

    PMID:14973222

    Open questions at the time
    • Defined activity on a single splicing substrate (cTNT); transcriptome-wide splicing scope not addressed
    • No structural model of the RRM–MSE complex
    • Did not address neuronal targets or function
  2. 2007 Medium

    Connected CELF4 loss to a neurological phenotype, showing it regulates neuroexcitability-related transcripts whose dysregulation produces seizures.

    Evidence Brunol4/Celf4 mutant (frequent-flyer) mouse model with expression profiling and EEG

    PMID:17677002

    Open questions at the time
    • Down-regulated transcripts were correlative, not shown to be direct binding targets
    • Cell type responsible for the phenotype not resolved
    • Mechanism linking RNA changes to excitability undefined
  3. 2011 High

    Localized CELF4 function to excitatory neurons, demonstrating that loss there is sufficient for seizures and selectively dysregulates excitatory transmission.

    Evidence Cell-type-specific conditional knockout mice with patch-clamp electrophysiology and inhibitory-neuron reporter imaging

    PMID:21745337

    Open questions at the time
    • Direct molecular target driving altered excitatory transmission not yet identified at this stage
    • Did not distinguish translational vs splicing mechanisms
  4. 2012 High

    Identified a direct mechanistic effector of the excitability phenotype by showing CELF4 binds Scn8a mRNA and controls Nav1.6 channel availability at the axon initial segment.

    Evidence RNA immunoprecipitation, immunostaining of AIS Nav1.6, and patch-clamp electrophysiology in knockout cortical neurons

    PMID:23090952

    Open questions at the time
    • Whether regulation is via translation, localization, or stability of Scn8a mRNA not fully resolved
    • Other channel targets contributing to hyperexcitability not enumerated
  5. 2012 High

    Defined CELF4's transcriptome-wide binding mode and post-transcriptional mechanism, showing 3' UTR preference and roles in mRNA stability, translation, and subcellular localization.

    Evidence CLIP-seq target identification, polysome profiling, and neuropil-vs-cell-body transcriptome analysis in knockout mice

    PMID:23209433

    Open questions at the time
    • Precise binding motif/structural determinants of 3' UTR selectivity not defined
    • Causal hierarchy among stability, translation, and localization effects unresolved
    • Co-factors mediating these effects unknown
  6. 2013 Medium

    Revealed dynamic, developmentally staged subcellular localization, supporting dual nuclear (processing) and cytoplasmic (localization/translation) roles.

    Evidence In situ hybridization and immunofluorescence across retinal development with cell-type markers

    PMID:23932931

    Open questions at the time
    • Localization is descriptive; functional consequences in retina not tested
    • Signals controlling the nuclear-to-cytoplasmic shift unknown
  7. 2016 Medium

    Extended the splicing function to human tissue, correlating a CELF4 polymorphism with TNNT2 splice-variant composition in human heart.

    Evidence GWAS with replication plus genotype-stratified TNNT2 splicing analysis in healthy human heart

    PMID:26811534

    Open questions at the time
    • Correlative; no direct functional assay of the variant on splicing
    • Mechanism of cardiomyopathy-risk modification not established
  8. 2022 Medium

    Linked CELF4 to dendritic spine maintenance and affective behavior, broadening its role beyond excitability control.

    Evidence AAV-shRNA knockdown in mouse prefrontal cortex with spine quantification and depression-like behavioral assays

    PMID:35306363

    Open questions at the time
    • Target mRNAs mediating spine loss not identified
    • Single lab, single study
  9. 2023 High

    Placed CELF4 in prenatal cortical synaptogenesis, controlling translation of synaptic and neurodevelopmental-risk mRNAs and subplate synapse balance.

    Evidence Polysome profiling with snRNA-seq on human fetal cortex plus forebrain-specific conditional knockout with synaptic analysis

    PMID:37758766

    Open questions at the time
    • Mechanism of sex-specific synaptic effects unexplained
    • Individual causal target transcripts for the synaptic phenotype not pinned down
  10. 2023 Medium

    Identified a non-neuronal oncogenic context, implicating CELF4 in mTOR signaling and splicing regulation in pancreatic neuroendocrine tumors.

    Evidence siRNA/shRNA silencing in PanNET cell lines with RNA-seq, proliferation assays, and xenograft growth

    PMID:38187140

    Open questions at the time
    • Direct CELF4 targets driving mTOR changes not defined
    • Whether tumor effect is via splicing or other post-transcriptional control unresolved
  11. 2025 Medium

    Established CELF4 as a human disease gene, showing N-terminal RRM variants cause a neurodevelopmental disorder and confirming RNA-binding activity is essential for neurodevelopment.

    Evidence Exome/genome sequencing in 15 patients with genotype-phenotype correlation and domain mapping

    PMID:40108438

    Open questions at the time
    • No new functional assay of patient variants
    • Mechanism linking RRM dysfunction to obesity phenotype not established
  12. 2025 High

    Generalized CELF4's role as an excitability brake to the peripheral nervous system, showing it suppresses sensory neuron firing and pain behavior.

    Evidence DRG-specific conditional knockout with patch-clamp electrophysiology and mechanical/thermal behavioral assays

    PMID:41089293

    Open questions at the time
    • Direct target transcripts in DRG neurons not identified
    • Relationship to the cortical Scn8a mechanism not tested
  13. 2026 Medium

    Defined CELF4-regulated pain mediators, showing it suppresses spinal TRPV1 and COX-2 expression and modulates neuropathic pain.

    Evidence AAV-mediated overexpression and knockdown in CCI mouse spinal cord with behavior and Western blot

    PMID:42207381

    Open questions at the time
    • Whether TRPV1/COX-2 mRNAs are direct CELF4 binding targets not shown
    • Single lab, single study
  14. 2026 Medium

    Demonstrated CELF4 dosage sensitivity at a central auditory synapse, affecting vesicle release, intrinsic excitability, and A-type potassium current.

    Evidence Celf4 haploinsufficient mice with ABR and patch-clamp electrophysiology of cochlear nucleus bushy cells

    PMID:42029780

    Open questions at the time
    • Molecular targets underlying altered IA and release not identified
    • Single lab study

Open questions

Synthesis pass · forward-looking unresolved questions
  • How CELF4 selects its 3' UTR targets at the structural/motif level and the causal hierarchy by which it controls stability, translation, and localization to set neuronal excitability remain unresolved.
  • No structural model of RRM–RNA recognition defining target specificity
  • Co-factors/effectors mediating mRNA stability and translational control unknown
  • Direct target transcripts linking CELF4 loss to PNS, auditory, and affective phenotypes largely uncatalogued

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0003723 RNA binding 4 GO:0045182 translation regulator activity 2 GO:0140110 transcription regulator activity 2
Localization
GO:0005634 nucleus 1 GO:0005829 cytosol 1
Pathway
R-HSA-112316 Neuronal System 3 R-HSA-8953854 Metabolism of RNA 3 R-HSA-1266738 Developmental Biology 1

Evidence

Reading pass · 15 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2004 CELF4 contains two adjacent RNA recognition motifs (RRM1 and RRM2) near the N-terminus and one RRM (RRM3) near the C-terminus; either RRM1 or RRM2 is necessary and sufficient for binding MSE RNA from the cardiac troponin T (cTNT) alternative exon region, and RRM2 plus an additional 66 amino acids of the divergent domain are as effective as full-length protein in activating MSE-dependent splicing in vivo. Comparative deletion analysis, RNA binding assays, in vivo splicing activity assays with truncation/deletion mutants of CELF4 Nucleic Acids Research High 14973222
2004 CELF4 promotes inclusion of the cardiac troponin T (cTNT) alternative exon 5 in vivo by binding conserved intronic muscle-specific elements (MSEs) flanking the exon. In vivo splicing assay, RNA binding assay using MSE RNA substrate Nucleic Acids Research High 14973222
2007 Disruption of Brunol4 (CELF4) in mice leads to down-regulation of at least four RNA molecules encoding proteins involved in neuroexcitability, particularly in the mutant hippocampus, resulting in limbic and tonic-clonic seizures. Mouse knockout/heterozygous mutant model (frequent-flyer, Ff), gene expression profiling, EEG PLoS Genetics Medium 17677002
2011 Selective deletion of Celf4 from cerebral cortex and hippocampus excitatory neurons (but not inhibitory neurons) is sufficient to lower seizure threshold and promote spontaneous convulsions; CELF4 is expressed predominantly in excitatory neurons and specifically regulates excitatory (but not inhibitory) neurotransmission as measured by patch-clamp recordings of cortical layer V pyramidal neurons. Conditional knockout mice (spatial/temporal), immunostaining, patch-clamp electrophysiology, inhibitory neuron reporter Genes, Brain, and Behavior High 21745337
2012 CELF4 binds to Scn8a mRNA (encoding Nav1.6 sodium channel); CELF4 deficiency results in elevated Nav1.6 protein expression at the axon initial segment (AIS), increased persistent sodium current (INaP), hyperpolarizing shift in voltage-dependent activation, lower action potential initiation threshold, and larger AP gain in cortical pyramidal neurons. RNA immunoprecipitation (CELF4 binds Scn8a mRNA), patch-clamp electrophysiology on brain slices, immunostaining of AIS Nav1.6, Celf4 knockout mouse model The Journal of Physiology High 23090952
2012 CELF4 binds to at least 15–20% of the transcriptome with striking specificity for the mRNA 3' untranslated region; in its absence, target mRNA stability and availability for translation are impaired (polysome fractionation shows altered translation), and mRNAs accumulate abnormally in neuropil, particularly those encoding regulators of synaptic plasticity and transmission. CLIP-seq (CELF4 target identification), polysome profiling, neuropil vs. cell body transcriptome analysis, Celf4 knockout mice PLoS Genetics High 23209433
2013 During mouse retinal development, CELF4 protein localizes dynamically: early in development it is restricted to nuclei of newly differentiating retinal ganglion cells (RGCs) and initial segments of RGC axons, then postnatally shifts to predominantly cytoplasmic localization in amacrine and bipolar cells and is enriched in synaptic boutons of rod bipolar cells, suggesting roles in both nuclear RNA processing and cytoplasmic mRNA localization/translation. In situ hybridization (ISH), immunofluorescence (IF) during retinal development, cell-type marker co-labeling Gene Expression Patterns Medium 23932931
2016 A polymorphism in CELF4 (rs1786814) modifies anthracycline-associated cardiomyopathy risk, and analysis of healthy human hearts showed that the GG genotype is associated with co-existence of more than one TNNT2 (cardiac troponin T) splicing variant, suggesting CELF4 regulates developmentally regulated TNNT2 splicing in human cardiac tissue. Genome-wide association study with replication, TNNT2 splicing variant analysis in healthy human heart samples stratified by rs1786814 genotype Journal of Clinical Oncology Medium 26811534
2022 Knockdown of CELF4 in the prefrontal cortex (PFC) of mice using AAV-shCELF4 reduces dendritic spine number and induces depression-like behaviors in the chronic social defeat stress model. AAV-mediated shRNA knockdown in PFC, spine morphology quantification, behavioral assays (depression-like behavior) Biochemical and Biophysical Research Communications Medium 35306363
2023 CELF4 is expressed in the marginal zone and subplate of developing prenatal neocortex (compartments enriched in initial synaptogenesis); forebrain-specific deletion of Celf4 disrupts the balance of subplate synapses in a sex-specific fashion, and CELF4 target mRNAs encode synaptic proteins and neurodevelopmental risk genes whose translation is controlled during fetal cortical development. Polysome profiling coupled with snRNA-seq on human fetal cortex, Celf4 conditional knockout (forebrain-specific), immunostaining, synaptic analysis Nature Communications High 37758766
2023 In pancreatic neuroendocrine tumor (PanNET) cells, CELF4 silencing alters mTOR signaling pathway activity and reduces in vivo xenograft tumor growth, and CELF4 modulation changes splicing event profiles; CELF4 is upregulated in PanNETs compared to non-tumoral adjacent tissue. siRNA/shRNA silencing in PanNET cell lines, RNA-seq (splicing and gene expression), in vivo xenograft experiments, functional proliferation assays, everolimus combination assays Molecular Therapy: Nucleic Acids Medium 38187140
2025 Heterozygous loss-of-function or missense variants in the N-terminal RRM domain region of CELF4 (essential for RNA-binding and splicing activity) in humans cause a neurodevelopmental disorder featuring intellectual disability, seizures, and obesity, confirming that the RNA-binding activity of CELF4's N-terminal RRMs is essential for normal neurodevelopment. Exome/genome sequencing in 15 patients with CELF4 variants, genotype-phenotype correlation, domain mapping to known RNA-binding/splicing regions European Journal of Human Genetics Medium 40108438
2025 Conditional knockout of Celf4 in adult capsaicin-sensitive DRG neurons results in reduced rheobase and neuronal hyperexcitability (patch-clamp), and behavioral mechanical and thermal hypersensitivity, establishing CELF4 as a negative regulator of sensory neuron excitability in the peripheral nervous system. Conditional KO mouse (DRG-specific), patch-clamp electrophysiology on dissociated DRG neurons, behavioral assays (mechanical/thermal thresholds, capsaicin/NGF-evoked hypersensitivity) Neurobiology of Pain High 41089293
2026 CELF4 overexpression in the spinal cord of chronic constriction injury (CCI) mice (via AAV) reduces mechanical and thermal hypersensitivity and downregulates TRPV1 and COX-2 protein expression; conversely, CELF4 knockdown rescues TRPV1 and COX-2 expression, identifying CELF4 as a suppressive regulator of these pain mediators in neuropathic pain pathways. AAV-mediated CELF4 overexpression and knockdown in CCI mouse spinal cord, behavioral assays, Western blot for TRPV1 and COX-2 Journal of Molecular Neuroscience Medium 42207381
2026 Celf4 haploinsufficiency in mice alters transmission at the endbulb of Held synapse in the cochlear nucleus: synaptic vesicle release is subtly reduced, bushy cell excitability is dampened (hyperpolarized resting membrane potential), and spike kinetics are faster due to enhanced fast-inactivating A-type potassium current (IA); hair cell ribbon synapses are largely unaffected. Celf4 heterozygous mouse model, auditory brainstem responses (ABR), patch-clamp electrophysiology of bushy cells, hair cell and SGN counts, ribbon synapse analysis Cellular and Molecular Neurobiology Medium 42029780

Source papers

Stage 0 corpus · 21 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2016 CELF4 Variant and Anthracycline-Related Cardiomyopathy: A Children's Oncology Group Genome-Wide Association Study. Journal of clinical oncology : official journal of the American Society of Clinical Oncology 107 26811534
2012 CELF4 regulates translation and local abundance of a vast set of mRNAs, including genes associated with regulation of synaptic function. PLoS genetics 96 23209433
2007 Complex seizure disorder caused by Brunol4 deficiency in mice. PLoS genetics 50 17677002
2004 ETR-3 and CELF4 protein domains required for RNA binding and splicing activity in vivo. Nucleic acids research 37 14973222
2011 Etiology of a genetically complex seizure disorder in Celf4 mutant mice. Genes, brain, and behavior 36 21745337
2012 Aberrant sodium channel activity in the complex seizure disorder of Celf4 mutant mice. The Journal of physiology 28 23090952
2023 Celf4 controls mRNA translation underlying synaptic development in the prenatal mammalian neocortex. Nature communications 24 37758766
2017 Familial 18q12.2 deletion supports the role of RNA-binding protein CELF4 in autism spectrum disorders. American journal of medical genetics. Part A 18 28407444
2002 Identification and characterization of murine Brunol4, a new member of the elav/bruno family. Cytogenetic and genome research 15 12438720
2023 Altered CELF4 splicing factor enhances pancreatic neuroendocrine tumors aggressiveness influencing mTOR and everolimus response. Molecular therapy. Nucleic acids 8 38187140
2023 Hypermethylated CDO1 and CELF4 in cytological specimens as triage strategy biomarkers in endometrial malignant lesions. Frontiers in oncology 7 38107069
2022 CELF4 regulates spine formation and depression-like behaviors of mice. Biochemical and biophysical research communications 6 35306363
2021 An intronic variant in the CELF4 gene is associated with risk for colorectal cancer. Cancer epidemiology 6 33930674
2024 The endometrial cancer detection using non-invasive hypermethylation of CDO1 and CELF4 genes in women with postmenopausal bleeding in Northwest China. CytoJournal 5 38841418
2017 Prenatal diagnosis and molecular cytogenetic characterization of an interstitial deletion of 18q12.1-q12.3 encompassing DTNA, CELF4 and SETBP1. Taiwanese journal of obstetrics & gynecology 3 29241933
2013 The expression analysis of Sfrs10 and Celf4 during mouse retinal development. Gene expression patterns : GEP 3 23932931
2025 Heterozygous CELF4 variants in the N-term region crucial for the RNA-binding activity lead to neurodevelopmental disorder and obesity. European journal of human genetics : EJHG 2 40108438
2025 The RNA-binding protein CELF4 is a negative regulator of sensory neuron excitability and mechanical and heat behavioral sensitivity. Neurobiology of pain (Cambridge, Mass.) 1 41089293
2024 CELF4 (rs1786814) gene polymorphism and speckle-tracking Echocardiography for cardiovascular complications in childhood cancer survivors. Pediatric research 1 39048669
2026 Celf4 Regulates Excitability of Bushy Cells in the Cochlear Nucleus of the Mouse Brainstem. Cellular and molecular neurobiology 0 42029780
2026 Spinal Cord CELF4 in Chronic Constriction Injury-Induced Neuropathic Pain: Association with TRPV1 and COX-2 Expression. Journal of molecular neuroscience : MN 0 42207381

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