SNAP25 Gene - Synaptosomal-Associated Protein 25

SNAP25 Gene

Pathway Diagram

```mermaid
flowchart TD
SNAP25["SNAP25"]
style SNAP25 fill:#006494,stroke:#4fc3f7,stroke-width:3px,color:#e0e0e0
Fibroblast_Activation["Fibroblast Activation"]
SNAP25 -->|"inhibits"| Fibroblast_Activation
Synaptic_Vesicle_Tau_Capture_I["Synaptic Vesicle Tau Capture Inhibition"]
SNAP25 -->|"regulates"| Synaptic_Vesicle_Tau_Capture_I
Neurodegeneration["Neurodegeneration"]
SNAP25 -->|"activates"| Neurodegeneration
Alzheimer["Alzheimer"]
SNAP25 -->|"activates"| Alzheimer
Ms["Ms"]
SNAP25 -->|"activates"| Ms
Ischemia["Ischemia"]
SNAP25 -->|"activates"| Ischemia
Inflammation["Inflammation"]
SNAP25 -->|"activates"| Inflammation
Aging["Aging"]
SNAP25 -->|"activates"| Aging
h_73e29e3a["h-73e29e3a"]
h_73e29e3a -->|"therapeutic target"| SNAP25
STX11["STX11"]
STX11 -->|"interacts with"| SNAP25
h_73e29e3a -->|"targets gene"| SNAP25
h_73e29e3a -->|"targets"| SNAP25
ALZHEIMER_S_DISEASE["ALZHEIMER'S DISEASE"]
ALZHEIMER_S_DISEASE -->|"associated with"| SNAP25
AMPK["AMPK"]
AMPK -->|"activates"| SNAP25
style Fibroblast_Activation fill:#888,stroke:#4fc3f7,color:#e0e0e0
style Synaptic_Vesicle_Tau_Capture_I fill:#5d4400,stroke:#4fc3f7,color:#e0e0e0
style Neurodegeneration fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
style Alzheimer fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
style Ms fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
style Ischemia fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
style Inflammation fill:#ef5350,stroke:#4fc3f7,col

SNAP25 Gene

Pathway Diagram

Introduction

Snap25 Gene Synaptosomal Associated Protein 25 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

This page provides comprehensive information about SNAP25 Gene, including its structure, normal function in the nervous system, and its role in neurodegenerative diseases.

<div class="infobox infobox-gene">
<div class="infobox-header">SNAP25</div>
<div class="infobox-content">
<table>
<tr><td><strong>Full Name</strong></td><td>Synaptosomal-Associated Protein 25</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>20p12.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td><a href="https://www.ncbi.nlm.nih.gov/gene/6616" target="_blank">6616</a></td></tr>
<tr><td><strong>OMIM</strong></td><td><a href="https://www.omim.org/entry/600240" target="_blank">600240</a></td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000132639</td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprot/P60880" target="_blank">P60880</a></td></tr>
<tr><td><strong>Protein</strong></td><td>SNAP-25</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Alzheimer's Disease, Parkinson's Disease, ALS, Schizophrenia, ADHD, CMD</td></tr>
</table>
</div>
</div>

Function

The SNAP25 gene encodes Synaptosomal-Associated Protein 25 (SNAP-25), a soluble N-ethylmaleimide-sensitive fusion (NSF) attachment protein receptor (SNARE) critical for synaptic vesicle exocytosis. SNAP-25 is a 206-amino acid peripheral membrane protein that localizes to the presynaptic plasma membrane and forms part of the SNARE complex required for neurotransmitter release.

SNAP-25 is a Q-SNARE (glutamine SNARE) that pairs with the R-SNARE (arginine SNARE) synaptobrevin (VAMP) to form the ternary SNARE complex. This complex, together with the Ca2+ sensor synaptotagmin, drives synaptic vesicle fusion with the presynaptic membrane.

Key Functions:

• Synaptic Vesicle Fusion: Essential for Ca2+-triggered neurotransmitter release
• SNARE Complex Formation: Forms stable complexes with syntaxin-1 and VAMP/synaptobrevin
• Synaptic Plasticity: Modulates short-term and long-term synaptic plasticity
• Neuronal Development: Critical for proper neuronal development and axon guidance
• Neuromuscular Junction: Essential for [acetylcholine](/entities/acetylcholine) release at the NMJ

Disease Associations

Alzheimer's Disease

• SNAP-25 levels are reduced in AD brains and CSF
• Implicated in synaptic loss, an early hallmark of AD
• SNAP-25 fragments found in AD brain parenchyma
• Reduced SNAP-25 correlates with cognitive decline
• SNP variations in SNAP25 associated with AD risk

Parkinson's Disease

• SNAP-25 expression reduced in PD substantia nigra
• Involved in dopaminergic neuron function
• Polymorphisms may influence PD susceptibility
• Altered SNAP-25 in Lewy body disease

ALS (Amyotrophic Lateral Sclerosis)

• SNAP-25 reduced in spinal cord motor [neurons](/entities/neurons) of ALS patients
• Implicated in excitotoxic mechanisms
• SNAP-25 autoantibodies detected in some ALS patients
• Synaptic dysfunction contributes to motor neuron degeneration

Other Neurological Disorders

• Schizophrenia: SNAP25 polymorphisms associated with risk; reduced expression in prefrontal cortex
• ADHD: SNAP25 variants linked to attention deficit hyperactivity disorder
• Congenital Myasthenic Syndrome (CMS): SNAP25 mutations cause presynaptic defects

Expression

SNAP25 is expressed predominantly in:

• [Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 pyramidal neurons
• [Cortex](/brain-regions/cortex): Particularly layer II-III excitatory neurons
• Cerebellum: Purkinje cells and granule cells
• Basal Ganglia: Substantia nigra pars compacta (dopaminergic neurons)
• Brainstem: Various nuclei
• Spinal Cord: Motor neurons

• Neuron-specific (not expressed in glia)
• Developmentally regulated (increases postnatally)
• Activity-dependent (regulated by neuronal firing)

Key Publications

Therapeutic Targeting

| Approach | Description | Status |
|----------|-------------|--------|
| Botulinum Neurotoxins | BoNT/A and BoNT/B cleave SNAP25, blocking acetylcholine release | FDA approved (cosmetic/therapeutic) |
| SNAP-25 Modulators | Small molecules enhancing SNAP-25 function | Preclinical |
| Gene Therapy | AAV-delivered SNAP-25 for synaptic repair | Research |

Background

The study of Snap25 Gene Synaptosomal Associated Protein 25 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

<sup>[[1]](https://pubmed.ncbi.nlm.nih.gov/12546660/)</sup> SNAP25 and synaptic function. PMID: 12546660(https://pubmed.ncbi.nlm.nih.gov/12546660/)

See Also

• [Synaptic Dysfunction Pathway](/mechanisms/synaptic-dysfunction)
• [Synaptophysin Protein](/proteins/synaptophysin-protein)
• Synapsin-1 Protein
• VAMP2 Gene
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [ALS](/diseases/amyotrophic-lateral-sclerosis)

External Links

Brain Atlas Resources

• [Allen Human Brain Atlas - SNAP25 Expression](https://human.brain-map.org/microarray/search/show?search_term=SNAP25)
• [Allen Cell Type Atlas - SNAP25](https://celltypes.brain-map.org/)
• [BrainSpan - SNAP25 Developmental Expression](https://brainspan.org/)
• [Allen Mouse Brain Atlas - SNAP25](https://mouse.brain-map.org/)
• [NCBI Gene: SNAP25](https://www.ncbi.nlm.nih.gov/gene/6616)
• [UniProt: SNAP25](https://www.uniprot.org/uniprot/P60880)
• [OMIM: SNAP25](https://www.omim.org/entry/600240)
• [GeneCards: SNAP25](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SNAP25)

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Synaptic Vesicle Tau Capture Inhibition](/hypothesis/h-73e29e3a) — <span style="color:#ff8a65;font-weight:600">0.34</span> · Target: SNAP25

Pathway Diagram

The following diagram shows the key molecular relationships involving SNAP25 Gene - Synaptosomal-Associated Protein 25 discovered through SciDEX knowledge graph analysis: