ELAVL3 (HuC) is a neuron-specific RNA-binding protein with three RNA recognition motifs (RRMs) and a hinge/linker region that binds to AU-/U-rich elements in the 3'-UTRs of target mRNAs to regulate mRNA stability, alternative splicing, alternative polyadenylation (3'-UTR length choice), and transcript abundance. RRM1 and RRM2 directly associate with AU-rich RNA, while RRM3 promotes transcript stability via poly(A)-tail-associated mechanisms. ELAVL3 is predominantly cytoplasmic but shuttles between nucleus and cytoplasm via signals in the hinge region. It plays essential roles in neuronal differentiation, maintenance, and synaptic integrity, particularly in the cerebellum and hippocampus; ELAVL3 loss perturbs splicing programs converging on glutamate regulation and neuronal excitability (e.g., AnkG exon 34 mis-inclusion), producing seizures and cerebellar ataxia in knockout models.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0140517 protein-RNA adaptor activity | IBA GO_REF:0000033 | ACCEPT | Summary: IBA annotation for protein-RNA adaptor activity based on phylogenetic inference. ELAVL3 functions as an RNA-binding protein that binds AU-rich elements in 3'-UTRs and regulates mRNA stability and processing, consistent with adaptor activity. Reason: This term accurately captures ELAVL3's core molecular function as a protein that mediates interactions between RNA molecules and other cellular components through its RNA-binding activity. The deep research confirms ELAVL3 "binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs" and "regulates alternative splicing, mRNA stability, and transcript abundance". UniProt confirms it "binds to AU-rich element (ARE) sequences of target mRNAs" [PMID:10710437]. IBA annotations are typically well-curated and phylogenetically sound. Supporting Evidence: PMID:10710437 HuC and HuD bind to the VEGF 3'-UTR regulatory segment (VRS) and to the c- myc 3'-UTR in a specific and concentration-dependent pattern file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs. This binding regulates alternative splicing, mRNA stability, and transcript abundance file:human/ELAVL3/ELAVL3-deep-research-falcon.md ELAVL3 functions primarily as a post-transcriptional regulator that stabilizes target transcripts, in part by binding AU-rich elements and influencing poly(A)-tail-associated protection; ELAVL proteins can multimerize on RNA and oppose destabilizing factors. PMID:37697079 Binding to RNA targets is facilitated by the RRM1 and RRM2 domains preferentially recognising AU-rich elements in the 3ΚΉUTR of transcripts |
| GO:0003676 nucleic acid binding | IEA GO_REF:0000002 | MODIFY | Summary: IEA annotation for nucleic acid binding based on InterPro domain assignment. This is a very general parent term for RNA binding. Reason: While technically correct (ELAVL3 does bind nucleic acids), this term is too broad and uninformative. ELAVL3 specifically binds RNA, not DNA, through its three RRM domains. The more specific term GO:0003723 (RNA binding) is already annotated and better represents the actual molecular function. Proposed replacements: RNA binding Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 contains three RNP-type RNA recognition motifs (RRMs), which are responsible for its RNA-binding activity |
| GO:0003723 RNA binding | IEA GO_REF:0000120 | ACCEPT | Summary: IEA annotation for RNA binding from combined automated annotation methods. This is appropriate but less specific than the available AU-rich region binding terms. Reason: This term accurately describes ELAVL3's core molecular function. ELAVL3 contains three RRM domains that bind RNA, specifically to AU-rich and GU-rich sequences in mRNA 3'-UTRs. While more specific terms exist (mRNA 3'-UTR AU-rich region binding), this general RNA binding term is acceptable and correct as a broader classification. Supporting Evidence: PMID:10710437 These proteins bind to AU-rich elements in the 3'-untranslated regions (3'-UTRs) of many growth-related mRNAs, including c-myc and VEGF file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 contains three RNP-type RNA recognition motifs (RRMs), which are responsible for its RNA-binding activity PMID:37697079 All four ELAVL proteins share a common basic structure, of three RNA recognition motif (RRM) binding domains and a hinge region |
| GO:0003730 mRNA 3'-UTR binding | IEA GO_REF:0000117 | ACCEPT | Summary: IEA annotation for mRNA 3'-UTR binding from ARBA machine learning models. This accurately captures ELAVL3's specific binding preference for 3'-UTR regions. Reason: This is a highly specific and accurate molecular function term for ELAVL3. Multiple lines of evidence demonstrate that ELAVL3 preferentially binds to AU-rich elements located in the 3'-UTRs of target mRNAs including VEGF and c-myc. This is a core molecular function of the protein. Supporting Evidence: PMID:10710437 HuC and HuD bind to the VEGF 3'-UTR regulatory segment (VRS) and to the c- myc 3'-UTR in a specific and concentration-dependent pattern file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs |
| GO:0007399 nervous system development | IEA GO_REF:0000043 | ACCEPT | Summary: IEA annotation for nervous system development based on UniProtKB keyword mapping. ELAVL3 is neuron-specific and plays roles in neuronal differentiation and maintenance. Reason: This biological process term is well-supported. ELAVL3 is brain-specific and essential for neurogenesis, neuronal differentiation, and maintenance of neurons. The deep research indicates ELAVL3 is "involved in the development and maintenance of neurons" and knockout mice exhibit severe motor deficits and cerebellar ataxia. UniProt states it "may be involved in neuronal differentiation and maintenance". Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md Neurogenesis: ELAVL3 is involved in the development and maintenance of neurons file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 knockout mice exhibit progressive motor deficits, severe cerebellar ataxia, and Purkinje cell axonal degeneration PMID:37697079 As Elavl3β/β mice aged, progressive severe cerebellar ataxia was observed PMID:37697079 At the cellular level, Purkinje neurons had disrupted synaptic formation, swollen axons, and overall deficits in neuronal transport, highlighting the requirement for Elavl3 activity in these neurons |
| GO:0030154 cell differentiation | IEA GO_REF:0000043 | MODIFY | Summary: IEA annotation for cell differentiation based on UniProtKB keyword mapping. This is a very general process term that applies to ELAVL3's role in neuronal differentiation. Reason: While technically correct (ELAVL3 is involved in neuronal differentiation), this term is too broad and non-specific. The more precise term would be neuronal differentiation or neuron differentiation, which better captures ELAVL3's tissue-specific role. Given that ELAVL3 is brain-specific and specifically involved in neurogenesis, a more specific term should be used. Proposed replacements: neuron differentiation Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md Neurogenesis: ELAVL3 is involved in the development and maintenance of neurons PMID:37697079 Elavl3 expression is upregulated during the differentiation of neural stem cells into inhibitory GABAergic neurons, in parallel with 3βUTR lengthening. Depletion of Elavl3 during this differentiation process caused a shift towards using proximal polyA sites compared to control cells, with a concomitant delay in neural stem cell differentiation |
| GO:1990904 ribonucleoprotein complex | IEA GO_REF:0000002 | ACCEPT | Summary: IEA annotation for ribonucleoprotein complex based on InterPro domain assignment. This cellular component term reflects ELAVL3's association with RNA as an RNP complex component. Reason: This is an appropriate cellular component annotation. ELAVL3 is an RNA-binding protein with RRM domains that forms ribonucleoprotein complexes with its target mRNAs. The deep research notes ELAVL3 binds over 1,100 transcripts in certain contexts, indicating it forms functional RNP complexes. While more specific localization terms could be added (nucleus, cytoplasm), this general RNP complex annotation is correct. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md In neuroendocrine cancer cell lines, ELAVL3 binds over 1,100 transcripts, with enrichment for genes involved in neuron projection development and synapse organization file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 is predominantly localized in the nucleus and cytoplasm of neurons throughout the brain |
| GO:0035925 mRNA 3'-UTR AU-rich region binding | IEA GO_REF:0000107 | ACCEPT | Summary: IEA annotation for mRNA 3'-UTR AU-rich region binding from Ensembl Compara orthology transfer. This is the most specific and accurate molecular function term for ELAVL3. Reason: This is the most precise molecular function annotation for ELAVL3 and represents its core biochemical activity. ELAVL3 specifically binds to AU-rich elements (AREs) in the 3'-UTRs of target mRNAs. PMID:10710437 experimentally demonstrates HuC binding to AU-rich regions in VEGF and c-myc 3'-UTRs. The deep research confirms binding to "GU-rich and AU-rich sequences" in 3'-UTRs. This annotation captures the key sequence specificity that distinguishes ELAVL3 from general RNA-binding proteins. Supporting Evidence: PMID:10710437 These proteins bind to AU-rich elements in the 3'-untranslated regions (3'-UTRs) of many growth-related mRNAs, including c-myc and VEGF file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs |
| GO:0005515 protein binding | IPI PMID:36950384 Protein interaction studies in human induced neurons indicat... | REMOVE | Summary: IPI annotation for protein binding based on physical interaction evidence from a large-scale proteomics study on autism spectrum disorders. Reason: While ELAVL3 does interact with proteins (UniProt mentions MAP1B light chain LC1, and IntAct shows interactions with DYRK1A, SCN2A, SYNGAP1), the generic "protein binding" term is uninformative and does not describe a molecular function. This term should not be used unless referring to a specific functional role (e.g., as an adapter or scaffold). The reference PMID:36950384 is a large-scale protein interaction study where ELAVL3 may have been detected as an interactor, but this does not constitute evidence for "protein binding" as a molecular function. ELAVL3's primary molecular function is RNA binding, not protein binding. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md Molecular Function: ELAVL3 binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs PMID:36950384 eCollection 2023 Mar 8. |
| GO:0005515 protein binding | IPI PMID:37207277 Using brain cell-type-specific protein interactomes to inter... | REMOVE | Summary: IPI annotation for protein binding based on physical interaction evidence from a large-scale brain cell-type-specific protein interactome study on schizophrenia. Reason: Same rationale as for PMID:36950384. The generic "protein binding" term is uninformative and should be avoided in GO curation. While ELAVL3 does engage in protein-protein interactions, this is not its primary molecular function, and the term does not provide useful functional information. ELAVL3 is fundamentally an RNA-binding protein. Large-scale proteomics studies detect many interactions, but these do not necessarily represent the core molecular function of the protein. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md Molecular Function: ELAVL3 binds preferentially to GU-rich and AU-rich sequences in intronic regions and 3'-untranslated regions (3'-UTRs) of target pre-mRNAs PMID:37207277 eCollection 2023 May 19. |
| GO:0035925 mRNA 3'-UTR AU-rich region binding | IDA PMID:10710437 RNA-binding analyses of HuC and HuD with the VEGF and c-myc ... | ACCEPT | Summary: IDA annotation for mRNA 3'-UTR AU-rich region binding based on direct experimental evidence from PMID:10710437. This is a duplicate of the IEA annotation but with stronger experimental evidence. Reason: This is the gold standard annotation for ELAVL3 - direct experimental evidence (IDA) for its most specific and important molecular function. PMID:10710437 directly demonstrates using an ELISA-based assay that HuC (ELAVL3) binds to AU-rich elements in the 3'-UTRs of VEGF and c-myc mRNAs in a specific and concentration-dependent manner. This represents the core biochemical activity of ELAVL3. The experimental evidence is robust and the term is maximally informative. Supporting Evidence: PMID:10710437 I demonstrate that HuC and HuD bind to the VEGF 3'-UTR regulatory segment (VRS) and to the c- myc 3'-UTR in a specific and concentration-dependent pattern PMID:10710437 These proteins bind to AU-rich elements in the 3'-untranslated regions (3'-UTRs) of many growth-related mRNAs, including c-myc and VEGF |
| GO:0005634 nucleus | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. ELAVL3 has a smaller nuclear pool that supports roles in splicing and APA, consistent with nucleocytoplasmic shuttling driven by hinge-region signals. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 is involved in the development and maintenance of neurons. ELAVL3 binds over 1,100 transcripts in neuroendocrine cancer cell lines, with enrichment for genes involved in neuron projection development and synapse organization UniProtKB:Q14576 May be involved in neuronal differentiation and maintenance (By similarity). file:human/ELAVL3/ELAVL3-deep-research-falcon.md ELAVL3 is predominantly cytoplasmic but capable of nucleocytoplasmic shuttling. A smaller nuclear pool supports roles in splicing and RNA processing, while the hinge/linker region contributes to export/localization control. PMID:37697079 Nuclear export and localisation signals located in the hinge region of the ELAVL proteins are responsible for the shuttling of RNAs between the nucleus and cytoplasm |
| GO:0005737 cytoplasm | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. nELAVL proteins including ELAVL3 are predominantly cytoplasmic where they participate in cytoplasmic mRNA stability and translation control. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 is involved in the development and maintenance of neurons. ELAVL3 binds over 1,100 transcripts in neuroendocrine cancer cell lines, with enrichment for genes involved in neuron projection development and synapse organization UniProtKB:Q14576 May be involved in neuronal differentiation and maintenance (By similarity). PMID:37697079 nELAVL proteins are primarily cytoplasmic, with a small fraction of nuclear activity, reflecting their roles (for example nuclear export, subcellular shuttling) file:human/ELAVL3/ELAVL3-deep-research-falcon.md ELAVL3 is predominantly cytoplasmic but capable of nucleocytoplasmic shuttling. |
| GO:0010608 post-transcriptional regulation of gene expression | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. Falcon-cited literature reinforces ELAVL3's role as a post-transcriptional regulator controlling splicing, APA/3'-UTR length choice, mRNA stability and translation. Supporting Evidence: file:human/ELAVL3/ELAVL3-deep-research-perplexity-lite.md ELAVL3 is involved in the development and maintenance of neurons. ELAVL3 binds over 1,100 transcripts in neuroendocrine cancer cell lines, with enrichment for genes involved in neuron projection development and synapse organization UniProtKB:Q14576 May be involved in neuronal differentiation and maintenance (By similarity). PMID:37697079 RNA-binding proteins (RBPs) are recognised as key regulators of post-transcriptional gene regulation, where their binding controls splicing, polyadenylation, nuclear export, mRNA stability and translation rate and decay |
| GO:0000380 alternative mRNA splicing, via spliceosome | NAS | NEW | Summary: Added based on falcon-cited literature documenting ELAVL3 regulation of neuronal alternative splicing programs. Reason: Falcon and Mulligan 2023 (PMID:37697079) document that ELAVL3 regulates alternative splicing of neuronal transcripts (e.g., AnkG/ANK3 exon 34) with convergence on glutamate-regulation and excitability pathways. This is a core molecular process not previously captured in existing_annotations. Supporting Evidence: PMID:37697079 Elavl3 regulates the embryonic-specific inclusion of vertebrate-specific exon 34 in the AnkG transcript. PMID:37697079 High-throughput sequencing analysis of alternative splicing in the cerebellum of Elavl3β/β mice highlighted the convergence of targeted transcripts on glutamate levels and neuronal excitability file:human/ELAVL3/ELAVL3-deep-research-falcon.md ELAVL3 has a documented role in alternative splicing; all three RRMs plus the hinge region contribute to HuC-dependent splice regulation, and ELAVL3 loss alters neuronal splicing programs linked to excitability. |
| GO:0110104 mRNA alternative polyadenylation | NAS | NEW | Summary: Added based on falcon-cited literature documenting ELAVL3 regulation of alternative polyadenylation and 3'-UTR length choice in neurons. Reason: Multiple sources cited by falcon (Mulligan 2023 PMID:37697079; Dorrity 2023 PMID:37862432) demonstrate that ELAVL3 (with other nELAVLs) promotes neuronal 3'-UTR lengthening through distal poly(A) site usage; ELAVL3 depletion shifts usage toward proximal sites. This is a distinct molecular process from splicing/stability and warrants a separate annotation. Supporting Evidence: PMID:37697079 Depletion of Elavl3 during this differentiation process caused a shift towards using proximal polyA sites compared to control cells, with a concomitant delay in neural stem cell differentiation PMID:37862432 the neuron-enriched ELAVL family of genes (ELAVL2, ELAVL3, and ELAVL4) can increase (i) 3'UTR length, (ii) dsRNA load, and (iii) activation of dsRNA-sensing PRRs such as MDA5, PKR, and TLR3 file:human/ELAVL3/ELAVL3-deep-research-falcon.md ELAVL3 participates in regulation of alternative polyadenylation and 3β²UTR length in neurons. ELAVL3 depletion shifts usage toward proximal poly(A) sites, whereas neuronal ELAVL proteins promote longer neuronal 3β²UTRs. |
| GO:0003729 mRNA binding | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. ELAVL3 binds mRNA via three RRM domains; this captures the molecular function used to regulate splicing/APA/stability of target mRNAs. Supporting Evidence: PMID:37697079 All four ELAVL proteins share a common basic structure, of three RNA recognition motif (RRM) binding domains and a hinge region PMID:37697079 Binding to RNA targets is facilitated by the RRM1 and RRM2 domains preferentially recognising AU-rich elements in the 3ΚΉUTR of transcripts |
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