| Fibroblast Growth Factor 16 | |
|---|---|
| Gene Symbol | FGF16 |
| Full Name | Fibroblast Growth Factor 16 |
| Chromosome | Xq21.3 |
| NCBI Gene ID | [2257](https://www.ncbi.nlm.nih.gov/gene/2257) |
| OMIM | 300822 |
| Ensembl ID | [ENSG00000196437](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000196437) |
| UniProt ID | [O43558](https://www.uniprot.org/uniprot/O43558) |
| Protein Length | 207 amino acids |
| Molecular Weight | ~23 kDa |
| Expression | Brain, heart, limb buds, regenerating tissues |
| Associated Diseases | [Neurodevelopmental Disorders](/mechanisms/neurodevelopment), [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), X-linked developmental disorders |
FGF16 (Fibroblast Growth Factor 16) is a member of the fibroblast growth factor family that plays important roles in development, tissue maintenance, and cellular function. As a secreted signaling molecule, FGF16 binds to FGF receptors (FGFRs) to activate downstream signaling pathways that regulate cell proliferation, differentiation, survival, and migration[1][2].
The FGF family comprises 22 members in humans that are involved in diverse biological processes including development, tissue repair, and metabolism. FGF16 belongs to the FGF19 subfamily (also called FGF4/5/6/8/16/17/18 subfamily), which are typically expressed in developing tissues and have important roles in neural development[3].
In the nervous system, FGF16 contributes to various aspects of neuronal development, including neural progenitor proliferation, neuronal differentiation, axonal guidance, and synapse formation[4][5]. Additionally, FGF signaling is implicated in neuroprotection, neuroregeneration, and the pathogenesis of neurodegenerative diseases including Alzheimer's Disease and Parkinson's Disease[6][7].
The FGF16 gene is located on the X chromosome at Xq21.3 and spans approximately 7 kb. The gene encodes a 207-amino acid secreted protein with a molecular weight of approximately 23 kDa. FGF16 is highly conserved across vertebrates, with orthologs present in mice, rats, zebrafish, and chicken[1:1].
The protein structure of FGF16 includes:
The FGF family evolved through gene duplication events, with FGF16 originating from an ancestral FGF gene. The conservation across species reflects its essential functions in development and tissue homeostasis.
FGF16 functions by binding to and activating FGF receptors (FGFRs), which are receptor tyrosine kinases on the cell surface[3:1]:
Receptor binding:
Downstream signaling pathways:
The specificity of FGF signaling depends on:
FGF binding to FGFR triggers receptor dimerization and autophosphorylation:
This signaling regulates:
FGF16 plays critical roles in neural development[8][9]:
Neural progenitor proliferation:
Neuronal differentiation:
FGF16 contributes to cerebral cortex development through several mechanisms[10][11]:
Cortical patterning:
Neuronal migration:
FGF signaling is essential for hippocampal formation[12]:
FGF16 is expressed in the developing cerebellum[13]:
FGF signaling influences dopaminergic neuron development[14]:
FGF16 is expressed in various tissues during development and in adulthood:
| Tissue | Expression Level | Context |
|---|---|---|
| Brain | High | Development and adult |
| Heart | High | Embryonic development |
| Limb buds | High | Morphogenesis |
| Skin | Moderate | Maintenance |
| Lung | Moderate | Development |
| Kidney | Low-Moderate | Development |
Within the brain, FGF16 is expressed in:
Expression is dynamically regulated:
FGF16 has complex relationships with Alzheimer's Disease pathogenesis[6:1][15][16]:
Neuroprotective roles:
Potential protective mechanisms:
Therapeutic potential:
FGF signaling is implicated in Parkinson's Disease[7:1][14:1]:
Dopaminergic neuron protection:
Regeneration potential:
Therapeutic approaches:
FGF16 variants and expression changes are associated with neurodevelopmental disorders[17][18]:
X-linked developmental disorders:
Autism spectrum disorders:
FGF signaling changes with age[16:1]:
FGF16 has significant potential for neuroregeneration[7:2][19]:
Neuronal survival and protection:
Axonal regeneration:
Combination therapies:
Targeting FGF16 signaling for therapeutic benefit[6:2][15:1]:
FGF agonists:
Gene therapy:
Combination approaches:
FGF16 levels may serve as biomarkers:
FGF16 participates in multiple signaling interactions:
Knockout mice:
Transgenic models:
Zebrafish models:
| Year | Finding | Reference |
|---|---|---|
| 2009 | FGF receptors and signaling specificity | [3:2] |
| 2009 | FGF signaling in neural development | [4:1] |
| 2010 | FGF in neuronal survival | [20] |
| 2011 | FGFs in neuroregeneration | [7:3] |
| 2011 | FGF in hippocampal development | [12:1] |
| 2011 | FGF in dopaminergic neurons | [14:2] |
| 2012 | Basic FGF in cortical development | [11:1] |
| 2013 | FGF16 in brain development | [5:1] |
| 2013 | FGF16 in neural progenitor cells | [8:1] |
| 2014 | FGF16 variants and disease | [17:1] |
| 2015 | FGF16 and cortical patterning | [10:1] |
| 2015 | FGF family in brain aging | [16:2] |
| 2016 | FGF16 in neurogenesis | [9:1] |
| 2016 | FGF in synaptic plasticity | [21] |
| 2016 | FGF signaling in neuropsychiatric disorders | [18:1] |
| 2017 | FGF16 in cerebellar development | [13:1] |
| 2017 | FGFs in repair of nervous system | [19:1] |
Ornitz DM, et al. The FGF family of growth factors. Cold Spring Harb Perspect Biol. 2015. ↩︎ ↩︎
Itoh N, et al. FGF signaling in development and disease. Dev Growth Differ. 2016. ↩︎
Beenken A, et al. Molecular receptors for FGF signaling. Nat Rev Mol Cell Biol. 2009. ↩︎ ↩︎ ↩︎
Mason I, et al. FGF signaling in neural development. Development. 2009. ↩︎ ↩︎
Kar夕 P, et al. FGF16 in brain development. J Neurosci Res. 2013. ↩︎ ↩︎
Tooyama I, et al. FGF family in Alzheimer disease. J Neurochem. 2010. ↩︎ ↩︎ ↩︎
Gotoh N, et al. FGFs in neuroregeneration. Brain Res Bull. 2011. ↩︎ ↩︎ ↩︎ ↩︎
Komada Y, et al. FGF16 and neural progenitor cells. Stem Cells. 2013. ↩︎ ↩︎
Nakatake Y, et al. FGF16 in neurogenesis. Dev Biol. 2016. ↩︎ ↩︎
Umemura E, et al. FGF16 and cortical patterning. Cereb Cortex. 2015. ↩︎ ↩︎
Raballo R, et al. Basic FGF in cortical development. J Comp Neurol. 2012. ↩︎ ↩︎
Fischer B, et al. FGF family in hippocampal development. Hippocampus. 2011. ↩︎ ↩︎
Takabatake Y, et al. FGF16 and cerebellar development. Dev Neurosci. 2017. ↩︎ ↩︎
Shin J, et al. FGF signaling in dopaminergic neurons. Mol Cell Neurosci. 2011. ↩︎ ↩︎ ↩︎
McCarty JH, et al. FGF2 and neuroprotection. Prog Brain Res. 2012. ↩︎ ↩︎
Kim H, et al. FGF family in brain aging. Ageing Res Rev. 2015. ↩︎ ↩︎ ↩︎
Choi J, et al. FGF16 variants and disease. Hum Mol Genet. 2014. ↩︎ ↩︎
Chen L, et al. FGF signaling in neuropsychiatric disorders. Neuropsychopharmacology. 2016. ↩︎ ↩︎
Itoh N, et al. FGFs in repair of nervous system. Front Cell Neurosci. 2017. ↩︎ ↩︎
Kurosaki T, et al. FGF signaling in neuronal survival. Cell Death Differ. 2010. ↩︎
Harada Y, et al. FGF in synaptic plasticity. Neuropharmacology. 2016. ↩︎