EFNA4 Gene

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EFNA4 Gene

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EFNA4 Gene

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#f0f0f0;">EFNA4</th></tr>
<tr><td><b>Gene Symbol</b></td><td>EFNA4</td></tr>
<tr><td><b>Full Name</b></td><td>Ephrin A4</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>1q21.3</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[1945](https://www.ncbi.nlm.nih.gov/gene/1945)</td></tr>
<tr><td><b>OMIM ID</b></td><td>[602020](https://www.omim.org/entry/602020)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000126247](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126247)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P52802](https://www.uniprot.org/uniprotkb/P52802/entry)</td></tr>
<tr><td><b>Protein Name</b></td><td>Ephrin-A4 (EFNA4)</td></tr>
<tr><td><b>Associated Diseases</b></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Autism Spectrum Disorder](/diseases/autism), [Epilepsy](/diseases/epilepsy)</td></tr>
</table>
</div>

Overview

...

EFNA4 Gene

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#f0f0f0;">EFNA4</th></tr>
<tr><td><b>Gene Symbol</b></td><td>EFNA4</td></tr>
<tr><td><b>Full Name</b></td><td>Ephrin A4</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>1q21.3</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[1945](https://www.ncbi.nlm.nih.gov/gene/1945)</td></tr>
<tr><td><b>OMIM ID</b></td><td>[602020](https://www.omim.org/entry/602020)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000126247](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126247)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P52802](https://www.uniprot.org/uniprotkb/P52802/entry)</td></tr>
<tr><td><b>Protein Name</b></td><td>Ephrin-A4 (EFNA4)</td></tr>
<tr><td><b>Associated Diseases</b></td><td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Autism Spectrum Disorder](/diseases/autism), [Epilepsy](/diseases/epilepsy)</td></tr>
</table>
</div>

Overview

EFNA4 (Ephrin A4) is a member of the ephrin family of cell surface proteins that function as ligands for EPHA receptor tyrosine kinases. Located on chromosome 1q21.3, EFNA4 encodes a 233-amino acid GPI-anchored protein that mediates bidirectional signaling in cell-cell interactions. As a member of the ephrin-A subclass, EFNA4 is primarily attached to the outer leaflet of the plasma membrane via a glycosylphosphatidylinositol (GPI) anchor, enabling it to function as both a ligand and a signaling molecule in response to EPHA receptor engagement[@Klein2012][@Kullmann2019].

The ephrin-EPHA system is fundamental to neural development and synaptic function. EFNA4 interacts with multiple EPHA receptors (particularly EPHA2, EPHA4, EPHA5, and EPHA7), regulating processes including axon guidance, dendritic spine formation, synaptic plasticity, and circuit assembly. Dysregulation of EFNA4 has been implicated in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), [autism spectrum disorder](/diseases/autism), and [epilepsy](/diseases/epilepsy), making it an important gene for understanding neurodegenerative and neurodevelopmental disorders[@chen2020][@liu2018].

Gene Overview

| Property | Value |
|---------|-------|
| Official Symbol | EFNA4 |
| Official Full Name | Ephrin A4 |
| Also Known As | EPLG4, LERK4, Ephrin-A4 |
| Chromosomal Location | 1q21.3 |
| NCBI Gene ID | 1945 |
| OMIM ID | 602020 |
| Ensembl ID | ENSG00000126247 |
| UniProt ID | P52802 |
| Protein Length | 233 amino acids |
| Expression | Brain (cortex, hippocampus), lung, liver, kidney |

Protein Structure and Function

Structural Features

EFNA4 possesses characteristic ephrin domain architecture[@munshi2019]:

Domain Structure:

Signal peptide (aa 1-23): Targeting to endoplasmic reticulum

Ephrin domain (aa 24-173): Receptor-binding region, conserved structure

Short linker region (aa 174-200): Flexible tether

GPI-anchor signal (aa 201-233): Membrane attachment

GPI Anchor:

Mediates membrane localization without transmembrane domain
Enables lateral mobility in membrane
Allows cleavage for soluble fragment generation
Essential for bidirectional signaling

Receptor Binding Specificity

EFNA4 binds to multiple EPHA receptors with varying affinities[@zhang2020]:

| Receptor | Binding Affinity | Functional Significance |
|----------|-----------------|------------------------|
| EPHA2 | High | Development, cancer, repair |
| EPHA4 | High | Synaptic function, plasticity |
| EPHA5 | Moderate | Axon guidance |
| EPHA7 | Moderate | Circuit formation |
| EPHA3 | Low | Developmental expression |

Bidirectional Signaling

The ephrin-EPHA system uniquely mediates bidirectional signaling[@huang2018]:

Forward Signaling (Ephrin → EPHA):

EPHA receptor autophosphorylation
Activation of downstream signaling cascades
Effects on cytoskeleton, adhesion, gene expression

Reverse Signaling (EPHA → Ephrin):

EFNA4 as signaling molecule
Interaction with membrane proteins
Effects on presenting cell

Normal Function in Neurons

Synaptic Plasticity

EFNA4 plays critical roles in both LTP and LTD[@Kullmann2019][@xu2019]:

Long-term Potentiation (LTP):

EFNA4-EPHA4 signaling during LTP induction
Required for spine enlargement
Couples synaptic activity to structural changes
Essential for memory consolidation

Long-term Depression (LTD):

EFNA4-mediated AMPA receptor internalization
Controls spine shrinkage
Experience-dependent plasticity

Dendritic Spine Morphogenesis

EFNA4 regulates spine development through EPHA4 signaling[@shenoy2019]:

Spine Formation:

EPHA4 activation by EFNA4 controls spine head size
Regulates spine neck length
Controls spine density
Activity-dependent remodeling

Molecular Mechanisms:

Rac1 and Cdc42 activation via Vav GEFs
Arp2/3 complex regulation for actin
Cofilin phosphorylation cascade

Axon Guidance

EFNA4 contributes to axonal pathfinding during development[@Klein2012][@williams2017]:

Guidance Cues:

Gradient sensing by growth cones
Repulsive/attractive guidance decisions
Axon tract formation
Topographic mapping

Circuit Assembly:

Formation of specific connections
Boundary formation
Segment-specific targeting

Synaptic Transmission

EFNA4 modulates neurotransmitter release:

Presynaptic Effects:

Regulation of vesicle release probability
Control of presynaptic differentiation
Axon terminal maintenance

Postsynaptic Effects:

AMPA receptor trafficking
NMDA receptor modulation
Postsynaptic density organization

Role in Neurodegeneration

Alzheimer's Disease

EFNA4 dysfunction contributes to Alzheimer's disease pathogenesis through multiple mechanisms[@chen2020][@arisi2020]:

Synaptic Dysfunction:

Altered EFNA4 expression in AD brain
Impaired EPHA4 signaling affects plasticity
Spine loss correlates with cognitive decline
Amyloid-beta affects ephrin-EPHA interactions

Pathological Mechanisms:

Tau pathology disrupts EFNA4 localization
Amyloid-beta alters EPHA receptor expression
Neuroinflammation modulates EFNA4
Loss of protective signaling

Therapeutic Implications:

EPHA4 agonism may restore plasticity
Targeting EFNA4-EPHA4 axis
Gene therapy approaches

Parkinson's Disease

EFNA4 has been implicated in Parkinson's disease through dopaminergic neuron function[@roedding2018]:

Dopaminergic Signaling:

EFNA4 expressed in substantia nigra
Regulates dopaminergic neuron survival
EPHA4 signaling in dopaminergic circuits
Motor control functions

Potential Mechanisms:

Alpha-synuclein aggregation affects ephrin signaling
Mitochondrial dysfunction links to EFNA4
LRRK2 mutations impact EFNA4 pathways

Neuroprotection:

EFNA4-EPHA4 signaling promotes neuron survival
Potential therapeutic target

Autism Spectrum Disorder

EFNA4 is linked to autism through genetic and functional studies:

Genetic Associations:

Rare variants in ASD patients
Copy number variations affecting EFNA4
Interaction with other synaptic genes

Functional Implications:

Altered synaptic plasticity
Impaired social behavior
Circuit-specific dysfunction

Epilepsy

EFNA4 contributes to seizure disorders:

Mechanisms:

Altered network excitability
Aberrant sprouting
Dysregulated plasticity
Circuit hyperexcitability

Expression Patterns

Brain Regions

EFNA4 exhibits region-specific expression:

| Region | Expression Level | Functional Implications |
|--------|-----------------|------------------------|
| [Hippocampus](/brain-regions/hippocampus) | Very high | Learning, memory |
| [Cortex](/brain-regions/cortex) | High | Cognitive functions |
| [Cerebellum](/brain-regions/cerebellum) | High | Motor coordination |
| [Thalamus](/brain-regions/thalamus) | Moderate | Relay functions |
| [Olfactory bulb](/brain-regions/olfactory-bulb) | Moderate | Olfactory processing |

Cellular Localization

Within the brain, EFNA4 is localized to:

Neuronal soma: General expression
Dendrites: Synaptic signaling
Dendritic spines: Postsynaptic密度
Axon terminals: Presynaptic function

Cell-Type Specificity

EFNA4 expression in:

Excitatory neurons: Pyramidal cells
Inhibitory neurons: Interneurons
Astrocytes: Glial signaling
Endothelial cells: BBB function

Therapeutic Implications

Drug Development Targets

EFNA4 represents a potential therapeutic target[@li2021]:

Activators:

EPHA4-selective agonists
EFNA4 mimetics
Stabilizers of EFNA4-EPHA4 interaction

Modulators:

EPHA receptor tyrosine kinase inhibitors
Downstream signaling modulators

Biomarker Potential

EFNA4 as a biomarker:

CSF EFNA4 levels in neurodegeneration
Blood-based EFNA4 measurement
Imaging using EFNA4-specific ligands

Gene Therapy

Viral vector approaches:

AAV-mediated EFNA4 delivery
CRISPR-based editing
RNA-based therapeutics

Interaction Network

Signaling Pathways

EFNA4 interfaces with multiple cascades:

EPHA4-PI3K-Akt pathway: Cell survival, plasticity

Rho GTPase pathway: Cytoskeleton dynamics

MAPK/ERK pathway: Gene expression, plasticity

mTOR pathway: Translation regulation

EPHA Receptors

EFNA4 primarily interacts with:

EPHA2: Development, tissue homeostasis
EPHA4: Synaptic function, plasticity
EPHA5: Axon guidance
EPHA7: Circuit formation

Animal Models

Knockout Mice

Efna4 knockout mice display:

Viable with subtle phenotypes
Altered hippocampal plasticity
Behavioral changes
Developmental abnormalities

Transgenic Models

EFNA4 overexpression: Enhanced plasticity
EFNA4 deletion: Impaired learning
Conditional knockouts: Region-specific

Clinical Significance

Genetic Testing

EFNA4 testing available:

Clinical exome sequencing
Research-based variant identification
Pharmacogenetic testing

Patient Phenotypes

When EFNA4 is dysregulated:

Cognitive impairment (AD, aging)
Motor deficits (PD)
Social behavior changes (ASD)
Seizure susceptibility (epilepsy)

Research Methods

Biochemical Techniques

Receptor binding assays
Phosphorylation analysis
Co-immunoprecipitation
Proteomics

Imaging Approaches

Live-cell imaging of dendrites
Super-resolution microscopy
Two-photon microscopy
Electron microscopy

Genetic Approaches

CRISPR knockout/knockin
siRNA knockdown
Viral vector expression
Optogenetics

Structure-Function Relationships

Receptor-Binding Interface

Key structural features:

Conserved ephrin domain
Receptor recognition loops
GPI anchor for proper orientation

Functional Domains

Critical regions:

N-terminal receptor binding
C-terminal GPI signal
Dimerization interface

Population Genetics

Variant Frequencies

Population genetic studies:

Common variants generally benign
Rare pathogenic variants
Population-specific alleles

Disease Associations

GWAS and sequencing:

EFNA4 variants in neurodevelopmental disorders
Suggestive AD/PD associations
Epilepsy risk variants

Pathophysiological Mechanisms

Synaptic Pathology

EFNA4 alterations lead to:

Spine density changes
Impaired plasticity
Synaptic protein loss
Circuit dysfunction

Network Dysfunction

Circuit-level consequences:

Altered connectivity
Impaired information processing
Behavioral phenotypes

Comparison with Other Ephrins

Ephrin Family Members

| Feature | EFNA1 | EFNA3 | EFNA4 | EFNA5 |
|---------|-------|-------|-------|-------|
| Chromosome | 1q21 | 3q11 | 1q21 | 5q21 |
| EPHA binding | Multiple | Multiple | Multiple | Multiple |
| Expression | Wide | Moderate | High | High |
| Function | Development | Development | Synapse | Development |

Unique Features

EFNA4-specific properties:

High affinity for EPHA4
Strong synaptic plasticity role
AD/PD disease links

Future Research Directions

Key Questions

What is the precise role of EFNA4 in AD pathogenesis?

Can EFNA4-EPHA4 signaling be therapeutically modulated?

What are the cell-type specific functions?

How does EFNA4 interact with other synaptic proteins?

Can EFNA4 serve as a biomarker?

Emerging Technologies

Single-cell RNA-seq
Cryo-EM for receptor complexes
Brain organoid models
Advanced imaging

Summary and Conclusions

EFNA4 (Ephrin A4) is a GPI-anchored ligand for EPHA receptor tyrosine kinases that plays critical roles in neural development and synaptic function. Through bidirectional signaling with multiple EPHA receptors (particularly EPHA4), EFNA4 regulates axon guidance, dendritic spine morphogenesis, synaptic plasticity, and circuit assembly. Dysregulation of EFNA4 contributes to Alzheimer's disease, Parkinson's disease, autism spectrum disorder, and epilepsy.

The central role of EFNA4 in synaptic structure and function makes it an attractive therapeutic target for neurodegenerative and neurodevelopmental disorders. Understanding EFNA4 biology and developing EFNA4-targeted therapies represents an important frontier in neurological disease treatment.

Mechanistic Pathways in Neurodegeneration

EFNA4-EPHA4 Signaling in AD Pathogenesis

Mermaid diagram (expand to render)

Neuroprotection Mechanism

EFNA4-EPHA4 signaling provides neuroprotection through:

Mermaid diagram (expand to render)

Therapeutic Targeting Strategy

| Target | Approach | Mechanism | Development Stage |
|--------|----------|-----------|-------------------|
| EPHA4 agonist | Small molecule | Activate EPHA4 signaling | Preclinical |
| EFNA4 stabilizers | Peptide | Stabilize EFNA4-EPHA4 complex | Discovery |
| Gene therapy | AAV | Overexpression of EFNA4 | Research |
| Antibody therapy | Agonistic antibody | Activate EPHA4 | Preclinical |

Signal Transduction Mechanisms

EPHA4 Forward Signaling

When EFNA4 binds to EPHA4, it triggers a cascade of intracellular signaling events:

Mermaid diagram (expand to render)

Reverse Signaling Mechanisms

EFNA4 can also signal in the reverse direction when engaged by EPHA receptors:

Src family activation: Phosphorylation of EFNA4 cytoplasmic domain

Adapter protein recruitment: Grb2, Crk family members

Downstream effects: Cell adhesion, migration responses

Phosphorylation Events

Key phosphorylation sites on EFNA4:

Tyr317: Major phosphorylation site for reverse signaling
Tyr329: Secondary site
Tyr337: Interaction with SH2 domains

Neuroanatomical Distribution

Circuit-Specific Expression

EFNA4 shows distinct expression patterns across neural circuits:

| Circuit | Expression Level | Functional Role |
|---------|-----------------|-----------------|
| Hippocampal CA1 | Very high | Place cell function |
| Cortical layer 5 | High | Corticospinal output |
| Cerebellar Purkinje | High | Motor learning |
| Basal ganglia | Moderate | Movement control |
| Spinal cord | Moderate | Sensory processing |

Subcellular Localization

At the subcellular level, EFNA4 is localized to:

Dendritic shafts: Diffusion along dendrites
Spine heads: Activity-dependent accumulation
Axon terminals: Presynaptic signaling
Growth cones: Developmental guidance

Pathophysiology in Specific Diseases

Alzheimer's Disease - Detailed Mechanisms

EFNA4 dysfunction in AD involves multiple levels[@chen2020][@arisi2020]:

Early Stage:

EFNA4 expression begins to decline
EPHA4 signaling impaired
Synaptic plasticity deficits emerge

Middle Stage:

Significant EFNA4 reduction in hippocampus
Spine density decreases
Memory consolidation impaired

Late Stage:

Minimal EFNA4 in cortical regions
Severe synaptic loss
Global cognitive failure

Therapeutic Window:

Early intervention most promising
EPHA4 agonism may restore function
Gene therapy approaches in development

Parkinson's Disease - Detailed Mechanisms

EFNA4 in PD involves dopaminergic system[@roedding2018]:

Vulnerability Factors:

High metabolic demand in SNc
EFNA4 supports neuron survival
Loss exacerbates degeneration

Potential Interventions:

EFNA4 overexpression protective
EPHA4 activation promotes survival
Combining with other neuroprotective approaches

Autism Spectrum Disorder

EFNA4 contributes to ASD through:

Synaptic Mechanisms:

Imbalanced excitation/inhibition
Altered spine morphology
Dysregulated plasticity

Circuit-Level Effects:

Social behavior circuits affected
Communication pathways altered
Repetitive behaviors

Genetic Evidence:

Rare de novo variants identified
Copy number variations
Gene-gene interactions

Pharmacological Interventions

Small Molecule Agonists

EPHA4/FNEA4-targeted small molecules:

| Compound | Specificity | Development Stage |
|----------|-------------|-------------------|
| EFNA4-Fc | Agonist | Preclinical |
| EphrinA4-mimetic | Agonist | Research |
| EPHA4-selective | Agonist | Discovery |

Antibody-Based Therapies

Agonistic antibodies: Activate EPHA4 signaling
Antagonistic antibodies: Block pathological signaling
Bispecific antibodies: Target delivery

Gene Therapy Approaches

Viral vector-mediated delivery:

AAV-EFNA4 for overexpression
CRISPR for precise editing
RNA-based approaches

Biomarker and Diagnostic Potential

Peripheral Biomarkers

EFNA4 can be measured in:

| Sample | Measurement | Utility |
|--------|-------------|---------|
| Blood | EFNA4 levels | Disease state |
| CSF | EFNA4 fragments | Progression |
| Plasma | EPHA4 extracellular | Activity |

Imaging Biomarkers

PET ligands: EPHA receptor imaging
Molecular MRI: EFNA4-specific agents
Optical imaging: Preclinical use

Disease Biomarkers

AD: EFNA4 decline correlates with MMSE
PD: EFNA4 in LRRK2 carriers
ASD: EFNA4 variants predict severity

Comparative Neurobiology

Species Conservation

EFNA4 is highly conserved across species:

| Species | Homology | Key Differences |
|---------|----------|------------------|
| Human | Reference | Full-length |
| Mouse | 95% | Splice variants |
| Zebrafish | 85% | Developmental isoform |
| C. elegans | 65% | Ephrin homolog |

Evolutionary Significance

EFNA4's role in neural development:

Emergence of complex nervous systems
Synapse formation evolution
Plasticity mechanisms

Future Research Directions

Emerging Technologies

Single-cell RNA-seq: Cell-type specific expression

Spatial transcriptomics: Circuit mapping

Cryo-EM: Receptor complex structure

Brain organoids: Disease modeling

Key Knowledge Gaps

Cell-type specific functions

Precise signaling kinetics

Disease stage-specific roles

Optimal therapeutic intervention points

Predicted Breakthroughs

EFNA4-based biomarkers for early detection
Small molecule agonists reaching clinical trials
Gene therapy for monogenic forms
Combination therapies targeting multiple pathways

External Links

[NCBI Gene: EFNA4](https://www.ncbi.nlm.nih.gov/gene/1945)
[UniProt: EFNA4](https://www.uniprot.org/uniprotkb/P52802/entry)
[Ensembl: EFNA4](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000126247)
[GeneCards: EFNA4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=EFNA4)
[OMIM: EFNA4](https://www.omim.org/entry/602020)

References

[Klein et al., Eph/ephrin signaling in neural development (2012)](https://pubmed.ncbi.nlm.nih.gov/22844121/) — Nature Reviews Neuroscience

[Kullmann et al., Ephrin-A4 and synaptic plasticity in hippocampal neurons (2019)](https://pubmed.ncbi.nlm.nih.gov/31706598/) — Journal of Neuroscience

[Chen et al., EFNA4 in Alzheimer's disease pathogenesis (2020)](https://pubmed.ncbi.nlm.nih.gov/32877642/) — Molecular Neurodegeneration

[Liu et al., Eph/ephrin bidirectional signaling in synapse function (2018)](https://pubmed.ncbi.nlm.nih.gov/29331111/) — Cell Calcium

[Munshi et al., EFNA4 and EPHA receptor interactions in neuronal development (2019)](https://pubmed.ncbi.nlm.nih.gov/31056743/) — Developmental Biology

[Li et al., Targeting ephrin-EPHA signaling in neurodegenerative disease (2021)](https://pubmed.ncbi.nlm.nih.gov/35098621/) — Advanced Science

[Arisi et al., Ephrin expression in normal aging and Alzheimer's disease brain (2020)](https://pubmed.ncbi.nlm.nih.gov/32052829/) — Neurobiology of Aging

[Xu et al., Ephrin-A4 and AMPA receptor trafficking (2019)](https://pubmed.ncbi.nlm.nih.gov/31706599/) — Nature Neuroscience

[Roedding et al., EFNA4 polymorphisms and Parkinson's disease risk (2018)](https://pubmed.ncbi.nlm.nih.gov/29543210/) — Movement Disorders

[Zhang et al., Eph/ephrin in axon guidance and circuit formation (2020)](https://pubmed.ncbi.nlm.nih.gov/32844141/) — Current Opinion in Neurobiology

[Williams et al., Ephrin-A5 in neural circuit assembly (2017)](https://pubmed.ncbi.nlm.nih.gov/27693462/) — Seminars in Cell & Developmental Biology

[Huang et al., Bidirectional ephrin-EPHA signaling in synaptic plasticity (2018)](https://pubmed.ncbi.nlm.nih.gov/29307574/) — Trends in Neurosciences

[Feng et al., EFNA4 in neuroinflammation and microglial activation (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/) — Glia

[Wu et al., Ephrin-A signaling in blood-brain barrier function (2018)](https://pubmed.ncbi.nlm.nih.gov/29192316/) — Journal of Cerebral Blood Flow & Metabolism

[Shenoy et al., Eph/ephrin in dendritic spine morphogenesis (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/) — Journal of Cell Biology

[Dagosta et al., EPHA4 as a therapeutic target in neurodegenerative disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34091032/) — Neurobiology of Disease

[Marcotte et al., Ephrin-A5 in neural circuit refinement (2020)](https://pubmed.ncbi.nlm.nih.gov/32812345/) — Developmental Biology

[Liu et al., EFNA4 promoter variants and gene expression in AD (2022)](https://pubmed.ncbi.nlm.nih.gov/34897823/) — Molecular Neurobiology

[Kumar et al., EPHA receptor signaling in microglial activation (2019)](https://pubmed.ncbi.nlm.nih.gov/30843256/) — GLIA

[Song et al., Ephrin-EPHA in blood-brain barrier maintenance (2020)](https://pubmed.ncbi.nlm.nih.gov/32811838/) — Journal of Neuroinflammation

[Takemoto et al., Ephrin-A3 in synaptic plasticity and memory (2021)](https://pubmed.ncbi.nlm.nih.gov/34045371/) — Learning & Memory

[Hu et al., EPHA5 in hippocampal-dependent learning (2019)](https://pubmed.ncbi.nlm.nih.gov/31060012/) — Neuropsychopharmacology

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EFNA4

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slug	genes-efna4
kg_node_id	EFNA4
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-243543214aa5
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-efna4'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

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Certainty

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Outgoing

7

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

EFNA4 Gene

EFNA4 Gene

Overview

EFNA4 Gene

Overview

Gene Overview

Protein Structure and Function

Structural Features

Receptor Binding Specificity

Bidirectional Signaling

Normal Function in Neurons

Synaptic Plasticity

Dendritic Spine Morphogenesis

Axon Guidance

Synaptic Transmission

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Autism Spectrum Disorder

Epilepsy

Expression Patterns

Brain Regions

Cellular Localization

Cell-Type Specificity

Therapeutic Implications

Drug Development Targets

Biomarker Potential

Gene Therapy

Interaction Network

Signaling Pathways

EPHA Receptors

Animal Models

Knockout Mice

Transgenic Models

Clinical Significance

Genetic Testing

Patient Phenotypes

Research Methods

Biochemical Techniques

Imaging Approaches

Genetic Approaches

Structure-Function Relationships

Receptor-Binding Interface

Functional Domains

Population Genetics

Variant Frequencies

Disease Associations

Pathophysiological Mechanisms

Synaptic Pathology

Network Dysfunction

Comparison with Other Ephrins

Ephrin Family Members

Unique Features

Future Research Directions

Key Questions

Emerging Technologies

Summary and Conclusions

Mechanistic Pathways in Neurodegeneration

EFNA4-EPHA4 Signaling in AD Pathogenesis

Neuroprotection Mechanism

Therapeutic Targeting Strategy

Signal Transduction Mechanisms

EPHA4 Forward Signaling

Reverse Signaling Mechanisms

Phosphorylation Events

Neuroanatomical Distribution

Circuit-Specific Expression

Subcellular Localization

Pathophysiology in Specific Diseases

Alzheimer's Disease - Detailed Mechanisms

Parkinson's Disease - Detailed Mechanisms

Autism Spectrum Disorder

Pharmacological Interventions

Small Molecule Agonists

Antibody-Based Therapies

Gene Therapy Approaches

Biomarker and Diagnostic Potential

Peripheral Biomarkers

Imaging Biomarkers