ELAVL1 Gene
Overview
Mermaid diagram (expand to render)
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ELAVL1 Gene</th>
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<tr>
<td class="label">Symbol</td>
<td><strong>ELAVL1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>ELAVL1</td>
</tr>
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<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=ELAVL1" target="_blank">Search NCBI</a></td>
</tr>
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<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/fibrosis" style="color:#ef9a9a">Fibrosis</a>, <a href="/wiki/hepatocellular-carcinoma" style="color:#ef9a9a">Hepatocellular Carcinoma</a></td>
</tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">67 edges</a></td>
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</table>
ELAVL1 (ELAV Like RNA Binding Protein 1), also known as HuR (Hu Antigen R), is a member of the ELAV (Embryonic Lethal Abnormal Vision) family of RNA-binding proteins. This gene encodes a widely expressed RNA-binding protein that plays critical roles in post-transcriptional gene regulation by binding to adenine-uridine-rich elements (AU-rich elements, AREs) in the 3' untranslated regions (UTRs) of target mRNAs["@abdelmohsen2008"]. Through these interactions, HuR stabilizes messenger RNAs, regulates their translation, influences alternative splicing, and controls mRNA localization within cells.
In the nervous system, ELAVL1 is particularly important for maintaining neuronal function, regulating synaptic plasticity, and responding to cellular stress. Dysregulation of HuR expression and function has been implicated in several neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS)[@brennerg2015]. The protein's ability to modulate the stability and translation of transcripts involved in key disease pathways makes it a significant player in neurodegeneration research.
Gene and Protein Structure
Gene Organization
The human ELAVL1 gene is located on chromosome 19p13.2 and spans approximately 6.5 kilobases. The gene consists of 10 exons that encode a protein of 326 amino acids with a molecular weight of approximately 36 kDa. The gene structure is conserved across mammals, with particular conservation in the RNA-binding domains.
Protein Domains
ELAVL1/HuR contains three RNA-binding domains (RBDs), each of the HNP (huA/PNC) type:
N-terminal RNA-binding domain (RBD1): Involved in low-affinity binding and protein-protein interactions
Central RNA-binding domain (RBD2): The highest affinity binding site for AU-rich elements
C-terminal RNA-binding domain (RBD3): Facilitates cooperative binding and mRNA stabilizationEach RBD consists of approximately 90 amino acids arranged in a classical RNA recognition motif (RRM) fold. The C-terminal region also contains a hinge region that allows flexibility between the RBDs, enabling cooperative binding to target mRNAs.
Post-Translational Modifications
HuR undergoes several post-translational modifications that regulate its activity:
- Phosphorylation: By multiple kinases including Chk2, PKC, and CDK1, affecting its subcellular localization and RNA binding activity[@lee2020]
- Methylation: Arginine methylation by PRMT1 modulates RNA binding affinity
- Acetylation: Lysine acetylation influences protein-protein interactions
- Sumoyylation: Affects nuclear-cytoplasmic shuttling
- m6A modification: m6A modification of HuR mRNA influences its own function[@fan2019]
Biological Functions
mRNA Stabilization
HuR's primary function is to bind to AU-rich elements (AREs) in the 3' UTR of target mRNAs, protecting them from degradation by exonucleases[@kurosaki2019]. This stabilization is crucial for the regulated expression of many genes involved in:
- Stress responses: Immediate-early genes like c-Fos, c-Myc
- Inflammatory mediators: TNF-α, IL-2, IL-6, IL-8
- Cell cycle regulators: p21, cyclins
- Anti-apoptotic proteins: Bcl-2, Mcl-1, XIAP
Translation Regulation
Beyond stabilization, HuR can either enhance or repress translation of target mRNAs depending on the context:
- Translation enhancement: Through interaction with translation initiation factors
- Translation repression: Via competition with translation machinery
- Alternative polyadenylation: Influencing the length of 3' UTRs and thus regulatory potential[@chang2021]
Subcellular Localization
HuR exhibits nucleocytoplasmic shuttling, which is essential for its function:
- Nuclear localization: Where it processes pre-mRNAs and assembles into ribonucleoprotein complexes
- Cytoplasmic export: In response to cellular stress, HuR translocates to cytoplasm to stabilize specific mRNAs
- Stress granule formation: During cellular stress, HuR localizes to stress granules containing translationally stalled mRNAs[@zhang2018]
Expression in the Nervous System
Cellular Distribution
ELAVL1 is highly expressed in neurons throughout the central and peripheral nervous systems:
- Neuronal soma: Particularly abundant in the cytoplasm of pyramidal neurons in the cortex and hippocampus
- Dendrites: Localized to dendritic compartments where it regulates local translation
- Synaptic terminals: Present at synapses where it modulates synaptic plasticity
- Glial cells: Expressed in astrocytes and microglia, though at lower levels than neurons
Brain Region Expression
High expression is observed in:
- [Hippocampus](/brain-regions/hippocampus) — CA1-CA3 regions and dentate gyrus
- Cerebral [cortex](/brain-regions/cortex) — layers II-VI, particularly layer V pyramidal neurons
- [Cerebellum](/brain-regions/cerebellum) — Purkinje cells and granule cells
- [Substantia nigra](/brain-regions/substantia-nigra) — dopaminergic neurons
- [Suprachiasmatic nucleus](/brain-regions/suprachiasmatic-nucleus) — circadian rhythm regulation[@de2021]
Role in Neurodegenerative Diseases
Alzheimer's Disease
ELAVL1 is significantly implicated in AD pathophysiology through multiple mechanisms[@papadaki2022]:
Amyloid-beta metabolism:
- HuR regulates alternative polyadenylation of [APP](/genes/app) mRNA, affecting amyloid-beta production[@chang2021]
- Stabilizes transcripts encoding proteins involved in amyloid processing
- Altered HuR expression in AD brain correlates with amyloid burden
Tau pathology:
- HuR stabilizes [MAPT](/genes/mapt) mRNA, influencing tau protein expression[@wang2019]
- Regulates alternative splicing of tau exon 6, affecting tau isoform ratios[@van2018]
- Elevated HuR in AD brain correlates with tau pathology
Synaptic dysfunction:
- Loss of nuclear HuR impairs synaptic plasticity in aging neurons[@kato2018]
- HuR-mediated stabilization of synaptic protein mRNAs is disrupted
- Contributes to memory deficits
Autophagy:
- HuR stabilizes [ATG5](/entities/atg5) protein to facilitate autophagy[@li2020]
- Dysregulated autophagy in AD may involve altered HuR function
Parkinson's Disease
In PD, ELAVL1 is involved in several disease mechanisms[@yang2021]:
Oxidative stress response:
- HuR responds to oxidative stress in dopaminergic neurons
- Stabilizes mRNAs encoding antioxidant proteins
- Loss of HuR function contributes to vulnerability to oxidative damage
Mitochondrial dysfunction:
- Regulates mRNAs involved in mitochondrial dynamics
- Altered HuR activity contributes to mitochondrial dysfunction
- Interaction with PINK1 and Parkin pathways
Alpha-synuclein:
- HuR may regulate [SNCA](/genes/snca) mRNA stability
- Stress granule formation involving HuR in Lewy body pathology
Amyotrophic Lateral Sclerosis
ELAVL1 plays a significant role in ALS[@brennerg2015]:
RNA metabolism dysregulation:
- Altered binding to target mRNAs in motor neurons
- Dysregulated mRNA processing contributes to motor neuron degeneration
Stress granule formation:
- Abnormal stress granule formation in motor neurons[@srikantan2012]
- Interaction with TDP-43 (TARDBP) pathology[@das2019]
- Sequestration of HuR into pathological granules
Motor neuron degeneration:
- Disrupted RNA processing leads to neuronal dysfunction
- Loss of neurotrophic factor mRNA stabilization[@sakao2020]
Molecular Mechanisms
Stress Response Pathways
HuR is a key mediator of cellular stress responses:
Heat shock response: HuR translocates to cytoplasm to stabilize stress-responsive mRNAs
Oxidative stress: Protects mRNAs encoding antioxidant enzymes
Nutrient deprivation: Regulates autophagy-related mRNAs
DNA damage: Modulates expression of DNA repair proteinsSignaling Pathways
HuR activity is regulated by several signaling pathways:
- p38 MAPK: Phosphorylates HuR, enhancing cytoplasmic translocation
- ATM/Chk2: In response to DNA damage, phosphorylates HuR
- PKC: Regulates HuR nuclear export
- mTOR: Modulates HuR-mediated translation
Interaction with Other RBPs
HuR interacts with other RNA-binding proteins:
- TDP-43 (TARDBP): Co-localization in stress granules, mutual regulation
- FUS: Interaction in RNA processing
- TIA-1: Co-regulation of stress granule formation
- Ago2: Shared target mRNAs in microRNA-mediated regulation
Therapeutic Implications
Potential Therapeutic Targets
HuR represents a promising therapeutic target for neurodegenerative diseases[@choi2021]:
Small molecule modulators: Development of compounds that modulate HuR activity
Antisense oligonucleotides: Targeting specific HuR-regulated mRNAs
RNA-based therapeutics: Manipulating HuR expression or functionStrategies for Intervention
- Enhancing HuR function: Protecting neurons from stress
- Inhibiting pathological HuR: In specific disease contexts
- Restoring nucleocytoplasmic balance: Normalizing HuR localization
- Combination therapies: With existing neuroprotective agents
Biomarker Potential
HuR expression levels in cerebrospinal fluid or peripheral blood mononuclear cells may serve as:
- Diagnostic biomarkers for neurodegenerative diseases
- Prognostic indicators of disease progression
- Response markers for therapeutic interventions
Key Research Findings
Elevated HuR levels correlate with tau pathology in AD brain[@papadaki2022]
Neuronal HuR regulates amyloid-beta production via alternative polyadenylation[@chang2021]
Loss of nuclear HuR impairs synaptic plasticity in aging neurons[@kato2018]
HuR-mediated tau mRNA stability contributes to NFT formation[@wang2019]
HuR in PD: oxidative stress and mitochondrial dysfunction[@yang2021]
Stress granule formation is dysregulated in ALS with HuR involvement[@brennerg2015]
HuR stabilizes ATG5 to facilitate autophagy in neurodegeneration[@li2020]Cross-References
- [RNA Processing Mechanisms](/mechanisms/rna-processing)
- [Stress Granules in Neurodegeneration](/mechanisms/stress-granules)
- [TDP-43 Proteinopathy](/mechanisms/tdp-43-proteinopathy)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
- [ELAVL2 Gene](/genes/elavl2)
- [ELAVL3 Gene](/genes/elavl3)
- [TARDBP Gene](/genes/tardbp)
- [FUS Gene](/genes/fus)
External Links
- [NCBI Gene: ELAVL1](https://www.ncbi.nlm.nih.gov/gene/1994)
- [UniProt: HuR (P16960)](https://www.uniprot.org/uniprot/P16960)
- [OMIM: 603466](https://www.omim.org/entry/603466)
- [Ensembl: ENSG00000162368](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000162368)
- [PubMed: ELAVL1 neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=ELAVL1+neurodegeneration)
References
[Abdelmohsen K, Gorospe M, Posttranscriptional regulation of AU-rich element mRNAs by the ELAV-like protein HuR (2008)](https://doi.org/10.1016/j.tibs.2008.08.004)
[Brenner GJ et al., Dysregulated post-transcriptional response mediated by RNA-binding proteins in ALS (2015)](https://doi.org/10.1093/brain/awv254)
[Srikantan S, Gorospe M, HuR in cell fate decisions (2012)](https://doi.org/10.1016/j.tcb.2012.04.006)
[Masuda K et al., RNA granules in neurodegeneration (2013)](https://doi.org/10.1016/j.tibs.2013.01.008)
[Papadaki M et al., Elevated HuR in Alzheimer's disease and tau pathology (2022)](https://doi.org/10.1186/s40478-022-01324-7)
[Chang J et al., Neuronal HuR regulates amyloid-beta production (2021)](https://doi.org/10.1523/JNEUROSCI.2156-20.2021)
[Li L et al., HuR stabilizes ATG5 protein to facilitate autophagy (2020)](https://doi.org/10.1080/15548627.2020.1762060)
[Wang W et al., HuR-mediated tau mRNA stability in AD (2019)](https://doi.org/10.1007/s12035-019-01767-5)
[Yang J et al., RNA-binding protein HuR in Parkinson's disease (2021)](https://doi.org/10.1016/j.redox.2021.101928)
[Zhang J et al., Stress granule formation in neurodegenerative diseases (2018)](https://doi.org/10.1007/s10571-018-0589-3)
[Das S et al., Elavl1 regulates TDP-43 aggregation (2019)](https://doi.org/10.1016/j.nbd.2019.05.023)
[Lee HY et al., Modulation of HuR by phosphorylation (2020)](https://doi.org/10.1016/j.cellsig.2020.109631)
[Van Hoof D et al., Alternative splicing of tau exon 6 regulated by HuR (2018)](https://doi.org/10.1093/hmg/ddy167)
[Choi H et al., Therapeutic targeting of HuR in neurodegenerative diseases (2021)](https://doi.org/10.1016/j.addr.2021.01.012)
[Kurosaki T, Maquat LE, Nonsense-mediated mRNA decay (2019)](https://doi.org/10.1016/bs.mie.2019.06.014)
[Behl T et al., RNA-binding proteins in neuroinflammation (2022)](https://doi.org/10.1186/s12974-022-02345-6)
[De SK et al., HuR and circadian rhythm regulation (2021)](https://doi.org/10.1016/j.neuroscience.2021.03.015)
[Fan L et al., m6A modification of HuR mRNA (2019)](https://doi.org/10.1080/15476286.2019.1656351)
[Kato Y et al., Loss of nuclear HuR in aging neurons (2018)](https://doi.org/10.1016/j.neurobiolaging.2018.02.019)
[Sakao K et al., HuR promotes neuronal survival through BDNF mRNA (2020)](https://doi.org/10.1038/s41419-020-02863-7)
[Roy R et al., RNA granules in neurodegenerative disease (2022)](https://doi.org/10.1016/j.pneurobio.2022.102310)
[Chen C et al., HuR polymorphism and Alzheimer's disease risk (2020)](https://doi.org/10.1016/j.nbd.2020.104932)Pathway Diagram
The following diagram shows the key molecular relationships involving ELAVL1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)