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FGFR activation in skeletal disorders: too much of a good thing
1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92093-0367, USA. mwebster@chemucsd.edu
Abstract:
During the past two years, a growing number of mutations have been identified in three of the four members of the fibroblast growth factor receptor (FGFR) family as causing autosomal dominant disorders of skeletal and cranial development. These mutations map to the extracellular domain, the transmembrane domain, or the tyrosine kinase domain of these receptors. Recent studies demonstrate that a common mechanism, constitutive activation of receptors signaling, underlies most, if not all, of these disorders. This suggests a normal role for FGFRs in the negative regulation of bone growth.
Insights
Mutations in fibroblast growth factor receptors (FGFRs) cause skeletal and cranial development disorders by constitutively activating receptor signaling. This suggests FGFRs normally inhibit bone growth.
Area of Science:
- Genetics and Developmental Biology
- Molecular Biology
- Cell Signaling
Background:
- Fibroblast growth factor receptors (FGFRs) are crucial for development.
- Mutations in FGFRs have been linked to various developmental disorders.
- Recent research focuses on the signaling pathways affected by these mutations.
Purpose of the Study:
- To investigate the role of FGFR mutations in skeletal and cranial development.
- To understand the common mechanism underlying FGFR-associated disorders.
- To elucidate the normal function of FGFRs in bone growth regulation.
Main Methods:
- Genetic analysis of FGFR family members.
- Mutation mapping to specific receptor domains (extracellular, transmembrane, tyrosine kinase).
- Analysis of receptor signaling pathways.
Main Results:
- Identified numerous mutations in three FGFR family members.
- Mutations were found across all receptor domains.
- Constitutive activation of FGFR signaling was identified as a common pathogenic mechanism.
Conclusions:
- FGFR mutations lead to autosomal dominant skeletal and cranial developmental disorders.
- Constitutive receptor activation is the primary mechanism.
- FGFRs likely play a negative regulatory role in bone growth.