Aliases for FGFR3 Gene
External Ids for FGFR3 Gene
Previous HGNC Symbols for FGFR3 Gene
Previous GeneCards Identifiers for FGFR3 Gene
This gene encodes a member of the fibroblast growth factor receptor (FGFR) family, with its amino acid sequence being highly conserved between members and among divergent species. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein would consist of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member binds acidic and basic fibroblast growth hormone and plays a role in bone development and maintenance. Mutations in this gene lead to craniosynostosis and multiple types of skeletal dysplasia. Three alternatively spliced transcript variants that encode different protein isoforms have been described. [provided by RefSeq, Jul 2009]
GeneCards Summary for FGFR3 Gene
FGFR3 (Fibroblast Growth Factor Receptor 3) is a Protein Coding gene. Diseases associated with FGFR3 include myeloma and achondroplasia. Among its related pathways are PI3K-Akt signaling pathway and PI-3K cascade. GO annotations related to this gene include protein tyrosine kinase activity and fibroblast growth factor-activated receptor activity. An important paralog of this gene is FGFR1.
UniProtKB/Swiss-Prot for FGFR3 Gene
Tyrosine-protein kinase that acts as cell-surface receptor for fibroblast growth factors and plays an essential role in the regulation of cell proliferation, differentiation and apoptosis. Plays an essential role in the regulation of chondrocyte differentiation, proliferation and apoptosis, and is required for normal skeleton development. Regulates both osteogenesis and postnatal bone mineralization by osteoblasts. Promotes apoptosis in chondrocytes, but can also promote cancer cell proliferation. Required for normal development of the inner ear. Phosphorylates PLCG1, CBL and FRS2. Ligand binding leads to the activation of several signaling cascades. Activation of PLCG1 leads to the production of the cellular signaling molecules diacylglycerol and inositol 1,4,5-trisphosphate. Phosphorylation of FRS2 triggers recruitment of GRB2, GAB1, PIK3R1 and SOS1, and mediates activation of RAS, MAPK1/ERK2, MAPK3/ERK1 and the MAP kinase signaling pathway, as well as of the AKT1 signaling pathway. Plays a role in the regulation of vitamin D metabolism. Mutations that lead to constitutive kinase activation or impair normal FGFR3 maturation, internalization and degradation lead to aberrant signaling. Over-expressed or constitutively activated FGFR3 promotes activation of PTPN11/SHP2, STAT1, STAT5A and STAT5B. Secreted isoform 3 retains its capacity to bind FGF1 and FGF2 and hence may interfere with FGF signaling.
Fibroblast growth factors (FGFs) (FGF1 - 10 and 16 - 23) are mitogenic signaling molecules that have roles in angiogenesis, wound healing, cell migration, neural outgrowth and embryonic development. FGFs bind heparan sulfate glycosaminoglycans (HSGAGs), which facilitates dimerization (activation) of FGF receptors (FGFRs). FGFRs are transmembrane catalytic receptors that have intracellular tyrosine kinase activity. There are four human genes encoding FGFRs, which produce seven different receptors (FGFR1b, FGFR1c, FGFR2b, FGFR2c, FGFR3b, FGFR3c and FGFR4) due to alternative splicing events occurring both in the extracellular and intracellular regions. The alternative splice isoforms are generally tissue specific: the b isoform is expressed in epithelial tissue, whereas the c isoform is expressed in mesenchymal tissue. HSGAG-FGF-FGFR binding initiates FGFR dimerization, enabling the cytoplasmic kinase domains to transphosphorylate tyrosine residues and become activated. HSGAGs also function to stabilize FGF-FGFR binding and prevent FGF degradation. FGFRs couple to the PLCgamma, MAPK and PI3-K/Akt intracellular signaling cascades and there is evidence of cross talk with the Notch signaling pathway. In addition, some activated FGF-FGFR complexes are endocytosed and function directly in the cytosol and/or nucleus of the cell. Mutations in FGFR genes are the cause of several human developmental disorders characterized by skeletal abnormalities such as achondroplasia, and upregulation of FGFR expression may lead to cell transformation and cancer.