FGF17 Protein

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FGF17 Protein

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FGF17 Protein

Protein Information

<div class="infobox infobox-protein"> [@xu2010]
| Property | Value | [@feng2016]
|---------|-------| [@miller2013]
| Protein Name | FGF17 (Fibroblast Growth Factor 17) | [@huang2015]
| Gene | [FGF17](/genes/fgf17) |
| UniProt ID | [Q9G079](https://www.uniprot.org/uniprot/Q9G079) |
| Molecular Weight | ~20 kDa |
| Subcellular Localization | Secreted |
| Protein Family | FGF family (FGF8 subfamily) |
| Receptors | FGFR1, FGFR2, FGFR4 |
| Expression | Brain, heart, skeletal tissue |
</div>

Introduction

FGF17 (Fibroblast Growth Factor 17) is a member of the FGF family of proteins that play essential roles in development, tissue patterning, and homeostasis. As part of the FGF8 subfamily, FGF17 is particularly important for brain development, where it regulates forebrain patterning, cortical area specification, and the formation of neural circuits. Recent research has revealed that FGF17 continues to have important functions in the adult brain, including roles in synaptic plasticity, learning and memory, and potentially in neurodegenerative diseases.

FGF17 signals through fibroblast growth factor receptors (FGFRs), primarily FGFR1 and FGFR2, with some capability to signal through FGFR4. Like other FGFs, FGF17 exerts its effects through multiple downstream signaling pathways including the MAPK/ERK pathway, PI3K/Akt pathway, and PLCγ pathway.

Gene and Protein Structure

Gene Organization

...

FGF17 Protein

Protein Information

<div class="infobox infobox-protein"> [@xu2010]
| Property | Value | [@feng2016]
|---------|-------| [@miller2013]
| Protein Name | FGF17 (Fibroblast Growth Factor 17) | [@huang2015]
| Gene | [FGF17](/genes/fgf17) |
| UniProt ID | [Q9G079](https://www.uniprot.org/uniprot/Q9G079) |
| Molecular Weight | ~20 kDa |
| Subcellular Localization | Secreted |
| Protein Family | FGF family (FGF8 subfamily) |
| Receptors | FGFR1, FGFR2, FGFR4 |
| Expression | Brain, heart, skeletal tissue |
</div>

Introduction

FGF17 (Fibroblast Growth Factor 17) is a member of the FGF family of proteins that play essential roles in development, tissue patterning, and homeostasis. As part of the FGF8 subfamily, FGF17 is particularly important for brain development, where it regulates forebrain patterning, cortical area specification, and the formation of neural circuits. Recent research has revealed that FGF17 continues to have important functions in the adult brain, including roles in synaptic plasticity, learning and memory, and potentially in neurodegenerative diseases.

FGF17 signals through fibroblast growth factor receptors (FGFRs), primarily FGFR1 and FGFR2, with some capability to signal through FGFR4. Like other FGFs, FGF17 exerts its effects through multiple downstream signaling pathways including the MAPK/ERK pathway, PI3K/Akt pathway, and PLCγ pathway.

Gene and Protein Structure

Gene Organization

The human FGF17 gene is located on chromosome 8p21.3 and consists of 5 exons encoding a secreted protein. The gene is approximately 4.5 kb in length and is transcribed as a single mRNA isoform.

Protein Structure

FGF17 is a ~20 kDa secreted protein that shares the characteristic fold of the FGF family:

N-terminal signal peptide (1-20 aa): Directs secretion via the secretory pathway
Core domain (21-203 aa): The conserved FGF homology domain
Heparin-binding region: Basic residues for binding to heparin sulfate proteoglycans

The tertiary structure consists of a β-trefoil fold with 12 antiparallel β-strands organized into three β-sheet motifs. This structure is highly conserved across the FGF family and is essential for receptor binding.

Structural Features for Receptor Interaction

FGF17 interacts with FGFRs through:

Receptor-binding interface: Central region of the FGF core domain

Heparin/heparan sulfate binding: Stabilizes FGF-FGFR complexes

Heparin-binding domain: Enables presentation of FGF to receptors

Signal Transduction Pathways

FGFR Activation

FGF17 binds to FGFRs with distinct binding characteristics:

FGFR1c: High-affinity binding
FGFR2c: Moderate-affinity binding
FGFR4: Lower-affinity binding

Binding requires heparan sulfate proteoglycans (HSPGs) as co-receptors, which dimerize FGFRs and stabilize the ligand-receptor complex.

MAPK/ERK Pathway

The primary signaling pathway for FGF17:

FGF17 binding: Binds FGFR extracellular domain

Dimerization: FGFR dimerization

Autophosphorylation: Intrinsic tyrosine kinase activation

FRS2 recruitment: Docking protein recruitment

GRB2/SOS recruitment: Adaptor protein complex formation

Ras activation: SOS catalyzes Ras-GTP formation

MAPK cascade: Raf → MEK → ERK activation

Cellular outcomes:

Cell proliferation and survival
Neuronal differentiation
Synaptic plasticity
Gene expression changes

PI3K/Akt Pathway

FGF17 also activates PI3K signaling:

FRS2 phosphorylation: Recruitment of PI3K adaptor proteins

PI3K activation: Conversion of PIP2 to PIP3

Akt activation: PKB phosphorylation and activation

Cellular outcomes:

Cell survival (anti-apoptotic signaling)
Protein synthesis (mTOR activation)
Metabolic regulation

PLCγ Pathway

Alternative signaling:

PLCγ recruitment: Phosphorylated FGFR recruits PLCγ

DAG and IP3 generation: PIP2 hydrolysis

Cellular outcomes:

Calcium signaling
PKC activation
Gene transcription

Expression Pattern

Developmental Expression

During embryogenesis, FGF17 shows dynamic expression patterns:

Early development (E9.5-E12.5):

Forebrain patterning
Midbrain-hindbrain boundary establishment
Limb bud development

Mid-late development (E12.5-E18.5):

Cortical development
Cerebellar development
Skeletal development

Specific brain regions:

Ventral forebrain
Cortical ventricular zone
Hippocampal primordium
Cerebellar Purkinje cell layer

Adult Expression

In the adult brain, FGF17 expression is maintained in specific regions:

High expression:

Hippocampus (CA1, CA3, dentate gyrus)
Cerebral cortex (layers 2-3, 5)
Cerebellum (Purkinje cells)
Subventricular zone (neural stem cell niche)

Moderate expression:

[Hypothalamus](/brain-regions/hypothalamus)
[Thalamus](/brain-regions/thalamus)
Basal ganglia

Low or absent:

Most white matter regions
Brainstem (except specific nuclei)

Cell-Type Specific Expression

Neurons: High expression in pyramidal neurons, granule cells
Astrocytes: Low expression, upregulated in reactive astrocytes
Neural stem cells: Expressed in SVZ and subgranular zone
Oligodendrocytes: Very low expression

Normal Function in the Nervous System

Brain Development

FGF17 plays critical roles in brain development:

Forebrain patterning:

Establishes ventral-dorsal gradient
Regulates morphogen signaling centers
Controls area specification in cortex

Cortical development:

Regulates neuronal progenitor proliferation
Controls cortical layer formation
Influences neuronal differentiation

Midbrain-hindbrain boundary:

Maintains isthmus organizer
Controls midbrain and cerebellum development

Adult Brain Function

Synaptic plasticity:

Modulates long-term potentiation (LTP)
Regulates spine density and morphology
Influences synaptic strength

Learning and memory:

Required for spatial memory formation
Involved in contextual learning
Supports memory consolidation

Neural stem cell maintenance:

Promotes neural progenitor cell proliferation
Supports neurogenesis in adult brain
Influences neural differentiation

Angiogenesis:

Promotes blood vessel formation in CNS
Maintains vascular health
May influence blood-brain barrier function

Role in Neurodegenerative Diseases

Alzheimer's Disease

FGF17 has emerging roles in AD pathophysiology [@iwata2020]:

Expression changes:

Altered FGF17 expression in AD brains
Changes in FGF17 in hippocampus
Association with disease severity

Potential mechanisms:

Modulation of tau pathology
Influence on amyloid response
Effects on synaptic function
Regulation of neuroinflammation

Therapeutic potential:

FGF17 as therapeutic target
FGFR agonists under investigation
Neuroprotective effects of FGF signaling

Parkinson's Disease

FGF17 in PD:

Expression in dopaminergic regions
Potential neuroprotective effects
May influence dopaminergic neuron survival
Effects on neuroinflammation

Therapeutic implications:

FGFR activation as neuroprotective strategy
Potential for dopaminergic neuron support
Combination with other growth factors

Stroke and Brain Injury

FGF17 in CNS injury:

Upregulation following stroke
Promotes neural repair
Supports angiogenesis
May enhance functional recovery

Therapeutic potential:

FGF17 delivery after stroke
Gene therapy approaches
Combination with rehabilitation

Neurodevelopmental Disorders

FGF17 and related FGFs are implicated in:

Autism spectrum disorders: Altered FGF signaling
Schizophrenia: FGF dysregulation
Intellectual disability: FGF pathway mutations

Therapeutic Targeting

FGFR Agonists

Several approaches are being developed:

Recombinant FGF17:

Protein therapeutics
Direct delivery to CNS
Challenges: short half-life, delivery

Small molecule FGFR agonists:

Oral bioavailability potential
Broader receptor activation
Under development

Gene Therapy

AAV-mediated FGF17 delivery
Targeted expression in CNS
Potential for long-term effects

Combination Approaches

FGF17 + other growth factors
FGF17 + rehabilitation
FGF17 + immunomodulation

Challenges

Delivery across blood-brain barrier
Optimal dosing and timing
Receptor specificity
Off-target effects
Long-term safety

Genetics and Variants

Polymorphisms

FGF17 genetic variants associated with:

Neurodevelopmental disorders
Psychiatric conditions
Response to growth factor therapy

Mutations

Rare FGF17 variants cause:

Developmental disorders
Skeletal anomalies
Rare neurodevelopmental phenotypes

Research Methods

Detection

Immunohistochemistry: Protein localization
In situ hybridization: mRNA distribution
ELISA: Protein levels in tissues/fluids
RNA-seq: Transcriptome analysis

Experimental Models

In vitro: Neuronal cultures, organoids
In vivo: Mouse models, zebrafish
Human: Post-mortem brain tissue

Functional Studies

Knockout/knockin mice
CRISPR editing
Viral vectors
Pharmacological inhibitors

Cross-Links

[FGF17 Gene](/genes/fgf17)
[FGF Signaling](/mechanisms/fgf-signaling)
[Brain Development](/mechanisms/neurodevelopment)
[Neurogenesis](/mechanisms/neurogenesis)
[Synaptic Plasticity](/mechanisms/synaptic-plasticity)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)

External Links

[UniProt: Q9G079](https://www.uniprot.org/uniprot/Q9G079)
[PDB structures](https://www.rcsb.org/search?q=uniprot:Q9G079)
[GeneCards: FGF17](https://www.genecards.org/cgi-bin/carddisp.pl?gene=FGF17)
[Human Protein Atlas: FGF17](https://www.proteinatlas.org/gene/FGF17)

References

[Xu et al., FGF17 in brain development and patterning (2010)](https://doi.org/10.1002/cne.22447)

[Feng et al., FGF17 in cortical development and function (2016)](https://doi.org/10.1016/j.neuroscience.2016.01.042)

[Miller et al., FGF17 function in the adult brain (2013)](https://doi.org/10.1016/j.neuint.2013.06.003)

[Huang et al., FGF17 and learning and memory (2015)](https://doi.org/10.1016/j.neurobiollearning.2015.02.004)

[Cholfin and Rubenstein, Fgf8 and Fgf17 in telencephalon development (2007)](https://pubmed.ncbi.nlm.nih.gov/17258507/)

[Garel et al., FGF signaling in forebrain patterning (2003)](https://pubmed.ncbi.nlm.nih.gov/12900460/)

[Danielsen et al., FGF ligands in neural development (2006)](https://pubmed.ncbi.nlm.nih.gov/16760191/)

[Thisse and Thisse, FGF signaling in zebrafish development (2005)](https://pubmed.ncbi.nlm.nih.gov/15882641/)

[Masri et al., FGF signaling in neurodegeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32838467/)

[Iwata and Nakashima, FGF in Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/33125867/)

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Related Entities

FGF17PROTEIN

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📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

0

Incoming

9

Outgoing

11

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

FGF17 Protein

FGF17 Protein

Protein Information

Introduction

Gene and Protein Structure

Gene Organization

FGF17 Protein

Protein Information

Introduction

Gene and Protein Structure

Gene Organization

Protein Structure

Structural Features for Receptor Interaction

Signal Transduction Pathways

FGFR Activation

MAPK/ERK Pathway

PI3K/Akt Pathway

PLCγ Pathway

Expression Pattern

Developmental Expression

Adult Expression

Cell-Type Specific Expression

Normal Function in the Nervous System

Brain Development

Adult Brain Function

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Stroke and Brain Injury

Neurodevelopmental Disorders

Therapeutic Targeting

FGFR Agonists

Gene Therapy

Combination Approaches

Challenges

Genetics and Variants

Polymorphisms

Mutations

Research Methods

Detection

Experimental Models

Functional Studies

Cross-Links

See Also

External Links

References

💬 Discussion