SYK Gene
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SYK Gene</th>
</tr>
<tr>
<td class="label">
Gene Symbol</td>
<td>SYK</td>
</tr>
<tr>
<td class="label">
Gene Name</td>
<td>Spleen Tyrosine Kinase</td>
</tr>
<tr>
<td class="label">
Chromosomal Location</td>
<td>9q22</td>
</tr>
<tr>
<td class="label">
NCBI Gene ID</td>
<td>6715</td>
</tr>
<tr>
<td class="label">
UniProt ID</td>
<td>P43405</td>
</tr>
<tr>
<td class="label">
Protein Family</td>
<td>Src family tyrosine kinases</td>
</tr>
<tr>
<td class="label">
Molecular Weight</td>
<td>~72 kDa</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">N-terminal SH2 (C-terminal)</td>
<td>11-100</td>
</tr>
<tr>
<td class="label">Interdomain A</td>
<td>101-117</td>
</tr>
<tr>
<td class="label">C-terminal SH2</td>
<td>118-207</td>
</tr>
<tr>
<td class="label">Interdomain B</td>
<td>208-263</td>
</tr>
<tr>
<td class="label">Kinase Domain</td>
<td>264-629</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">
Fostamatinib</td>
<td>Pro-drug, converted to R406</td>
</tr>
<tr>
<td class="label">
R406</td>
<td>Direct SYK inhibitor</td>
</tr>
<tr>
<td class="label">
PRT062607</td>
<td>Selective SYK inhibitor</td>
</tr>
<tr>
<td class="label">
BAY 61-3606</td>
<td>Small mol
...SYK Gene
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SYK Gene</th>
</tr>
<tr>
<td class="label">
Gene Symbol</td>
<td>SYK</td>
</tr>
<tr>
<td class="label">
Gene Name</td>
<td>Spleen Tyrosine Kinase</td>
</tr>
<tr>
<td class="label">
Chromosomal Location</td>
<td>9q22</td>
</tr>
<tr>
<td class="label">
NCBI Gene ID</td>
<td>6715</td>
</tr>
<tr>
<td class="label">
UniProt ID</td>
<td>P43405</td>
</tr>
<tr>
<td class="label">
Protein Family</td>
<td>Src family tyrosine kinases</td>
</tr>
<tr>
<td class="label">
Molecular Weight</td>
<td>~72 kDa</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">N-terminal SH2 (C-terminal)</td>
<td>11-100</td>
</tr>
<tr>
<td class="label">Interdomain A</td>
<td>101-117</td>
</tr>
<tr>
<td class="label">C-terminal SH2</td>
<td>118-207</td>
</tr>
<tr>
<td class="label">Interdomain B</td>
<td>208-263</td>
</tr>
<tr>
<td class="label">Kinase Domain</td>
<td>264-629</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">
Fostamatinib</td>
<td>Pro-drug, converted to R406</td>
</tr>
<tr>
<td class="label">
R406</td>
<td>Direct SYK inhibitor</td>
</tr>
<tr>
<td class="label">
PRT062607</td>
<td>Selective SYK inhibitor</td>
</tr>
<tr>
<td class="label">
BAY 61-3606</td>
<td>Small molecule inhibitor</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/depression" style="color:#ef9a9a">Depression</a>, <a href="/wiki/fibrosis" style="color:#ef9a9a">Fibrosis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">91 edges</a></td>
</tr>
</table>
Introduction
Syk Gene 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
SYK (Spleen Tyrosine Kinase) is a non-receptor tyrosine kinase that plays critical roles in immune receptor signaling, cellular adhesion, and phagocytosis. Originally discovered in hematopoietic cells, SYK is now recognized as an important regulator of microglial function and neuroinflammation in neurodegenerative diseases. This page covers the SYK gene structure, protein function, expression, and therapeutic targeting in Alzheimer's Disease, Parkinson's Disease, and other neurodegenerative conditions. [@gylys2020]
Gene Structure
The SYK gene consists of 18 exons spanning approximately 18 kb of genomic DNA. The gene encodes a protein with 629 amino acids containing two N-terminal SH2 domains, an interdomain, and a C-terminal kinase domain.
Protein Domains
Protein Function
SYK is activated by immune receptor engagement:
Activation Mechanism: Phosphorylation of ITAM (Immunoreceptor Tyrosine-based Activation Motif) motifs on adaptor proteins
Signal Transduction: recruitment via SH2 domains, autophosphorylation of activation loop tyrosines
Downstream Targets: Multiple substrates including PLCγ, VAV, LAT, SLP-76Key Functions
- B Cell Receptor Signaling: Essential for B cell development and function
- Fc Receptor Signaling: Activates macrophages, neutrophils, mast cells
- Integrin Signaling: Regulates cell adhesion and migration
- Phagocytosis: Controls FcγR-mediated phagocytosis in macrophages
- Cytokine Production: Regulates inflammatory cytokine expression
Expression Pattern
Hematopoietic System
- B lymphocytes: High expression, essential for BCR signaling
- Macrophages/Microglia: Moderate expression
- Dendritic cells: Present
- Mast cells: High expression
- Neutrophils: Low-moderate expression
Nervous System
Microglial Expression:
- SYK is expressed in brain [microglia](/cell-types/microglia-neuroinflammation) (Iba1+ cells)
- Increased expression in disease states
- Localizes to amyloid plaques in AD brain
Neuronal Expression:
- Lower levels in [neurons](/entities/neurons)
- May play roles in synaptic plasticity
Role in Neurodegeneration
Alzheimer's Disease
SYK contributes to AD pathogenesis through:
- Microglial Activation: SYK mediates [Aβ](/proteins/amyloid-beta)-induced microglial activation
- Pro-inflammatory Cytokine Production: IL-1β, TNF-α, IL-6 upregulation
- Phagocytosis Regulation: Both positive and negative effects on Aβ clearance
- [TREM2](/proteins/trem2-protein) Signaling: SYK interacts with [TREM2](/genes/trem2) downstream signaling
- Synaptic Pruning: Excess SYK activity may contribute to synaptic loss
Key Evidence:
- Elevated SYK phosphorylation in AD brain (postmortem)
- SYK colocalizes with amyloid plaques
- SYK inhibitors reduce neuroinflammation in animal models
Parkinson's Disease
In Parkinson's disease:
- Microglial Activation: SYK mediates [α-synuclein](/proteins/alpha-synuclein)-induced inflammation
- Dopaminergic Neuron Toxicity: Pro-inflammatory cytokine effects
- LRRK2 Interaction: SYK may signal downstream of LRRK2 mutations
Multiple Sclerosis
- SYK in demyelinating disease
- Therapeutic targeting with SYK inhibitors
- MS clinical trial data for SYK inhibitors ( fostamatinib)
Therapeutic Targeting
SYK Inhibitors
Therapeutic Applications in Neurodegeneration
Microglial Modulation: Reducing harmful inflammation
TREM2 Pathway Modulation: Interfering with pathological signaling
Synaptic Protection: Preventing excessive pruningChallenges
- Systemic immunosuppression risk
- Optimal timing of intervention
- [Blood-brain barrier](/entities/blood-brain-barrier) penetration
- Specificity for disease-associated microglia
Animal Models
- SYK knockout mice: Embryonic lethal (B cell defects)
- Conditional knockouts: [Microglia](/entities/microglia)-specific models
- Transgenic models: Human SYK expression
- Fostamatinib studies: In AD/PD mouse models
Biomarkers
- p-SYK levels: Peripheral blood mononuclear cell marker
- CSF SYK: Potential biomarker
- Microglial activation markers: Correlate with SYK activity
Research Directions
- Developing brain-penetrant selective SYK inhibitors
- Understanding SYK-TREM2 interaction
- Biomarker development for patient selection
- Combination approaches with anti-amyloid therapy
Background
The study of Syk Gene 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.
See Also
- SYK Protein - SYK protein product
- TREM2 Gene - Microglial receptor
- TREM2 Signaling Pathway - Microglial activation
- Neuroinflammation Pathway - Inflammation in neurodegeneration
- [Alzheimer's Disease](/diseases/- [Parkinson's Disease](/diseases/- [Microglia](/cell-types/microglia)sease) in AD
- [Parkinson's Disease](/diseases/- [Microglia](/cell-types/microglia)sease) SYK in PD
- [Microglia](/cell-types/microglia) Brain immune cells
External Links
- [NCBI Gene: SYK](https://www.ncbi.nlm.nih.gov/gene/6715)
- [UniProt: P43405](https://www.uniprot.org/uniprot/P43405)
- [GeneCards: SYK](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SYK)
- [PhosphoSitePlus: SYK](https://www.phosphosite.org/proteinAction.action?id=8718)
References
[Lin YC, et al, (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/30547812/)
[Gylys KH, et al, (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32807954/)
[Zhou Y, et al, (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31444928/)
[Phares TW, et al, (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28739652/)
[Zhang S, et al, (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34271928/)
[Macauley MS, et al, (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27461337/)
[Mócsai A, et al, (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20467424/)
[Cooper J, et al, (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35835421/)Pathway Context
Mermaid diagram (expand to render)
Pathway Diagram
The following diagram shows the key molecular relationships involving SYK Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)