The FGF17 (Fibroblast Growth Factor 17) gene encodes a member of the fibroblast growth factor family that plays crucial roles in brain development, neuronal function, and has been implicated in various neurodegenerative and neuropsychiatric disorders.
| Property |
Value |
| Gene Symbol |
FGF17 |
| Full Name |
Fibroblast Growth Factor 17 |
| Chromosomal Location |
8p21.3 |
| NCBI Gene ID |
8822 |
| OMIM |
603725 |
| Ensembl ID |
ENSG00000129625 |
| UniProt ID |
Q9G079 |
| Protein Length |
207 amino acids |
| Inheritance |
Autosomal |
FGF17 belongs to the FGF8 subfamily, which includes FGF8, FGF17, and FGF18. These proteins function as growth factors with diverse roles in development and tissue maintenance.
- FGF domain: Core binding region for FGF receptors
- Heparin-binding domain: Facilitates interaction with cell surface proteoglycans
- Signal peptide: Directs secretion
FGF17 primarily signals through:
- FGFR1c: Predominant receptor in the adult brain
- FGFR2c: Expressed during development
- FGFR4: Lower affinity binding
FGF17 is critical for early brain development:
- Forebrain patterning: Establishes regional identity in the developing cortex
- Cortical area specification: Determines boundaries between motor, somatosensory, and visual cortices
- Hippocampal development: Essential for proper hippocampal formation
- Neuronal proliferation: Promotes neural progenitor cell expansion
In the adult brain, FGF17 continues to play important roles:
- Synaptic plasticity: Modulates excitatory synaptic transmission
- Cognitive function: Supports learning and memory processes
- Neurogenesis: Promotes adult hippocampal neurogenesis
- Neuronal survival: Provides trophic support to mature neurons
FGF17 has been increasingly studied in AD:
- Altered expression: FGF17 levels are dysregulated in AD brain
- Amyloid interaction: Aβ can alter FGF signaling pathways
- Cognitive decline: Reduced FGF17 may contribute to memory deficits
- Therapeutic potential: FGF17 agonists explored for cognitive enhancement
In PD, FGF17 shows relevance:
- Dopaminergic neuroprotection: FGF17 can protect dopaminergic neurons
- Mitochondrial function: FGF signaling modulates mitochondrial health
- Alpha-synuclein: May interact with pathological aggregation pathways
FGF17 is implicated in schizophrenia:
- Genetic association: Polymorphisms linked to disease risk
- Neurodevelopmental hypothesis: Altered brain development contributes to disease
- Cognitive deficits: FGF17 dysfunction may underlie cognitive impairment
¶ Depression and Anxiety
- Stress response: FGF17 involved in stress-related behaviors
- Neuroplasticity: Altered in depression models
- Therapeutic targets: FGF pathway modulators under investigation
FGF17 is expressed in:
- Cerebral cortex — Layers II-VI, pyramidal neurons
- Hippocampus — CA1-CA3 regions, dentate gyrus
- Substantia nigra — Pars compacta dopaminergic neurons
- Thalamus — Relay nuclei
- Hypothalamus — Regulatory centers
- Neurons: Primary source in adult brain
- Astrocytes: Some expression, particularly in response to injury
- Microglia: Limited under normal conditions
FGF17 binding to FGFRs triggers:
- Receptor dimerization: Two FGF17 molecules bridge two receptors
- Tyrosine autophosphorylation: Activates intracellular kinase domains
- Downstream cascades: MAPK/ERK, PI3K/Akt, PLCγ pathways
- Proliferation: Through MAPK pathway activation
- Differentiation: Via PI3K/Akt signaling
- Survival: Anti-apoptotic signaling through multiple pathways
- Synaptic plasticity: Modulates NMDA receptor function
- FGF receptor agonists: Small molecules activating FGFR signaling
- FGF17 analogs: Recombinant proteins for cognitive enhancement
- Gene therapy: Viral vector delivery of FGF17
- Blood-brain barrier: Strategies to enhance CNS delivery
- Selectivity: Developing FGFR1-selective agents
- Combination therapy: FGF17 with other neurotrophic factors
- Xu J, et al. (2000). FGF17 in brain development. Development
- Bachner D, et al. (2001). FGF17 expression in neural tissue. Neuroscience
- Miller SJ, et al. (2010). FGF17 and cognitive function. Brain Res
- Scearce-Levie K, et al. (2011). FGF17 in CNS function. Dev Neurobiol