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This study focuses on the effects of FGFR gene activation mutations on craniofacial bone structure, using two FGFR mutant mice as models to investigate their roles in mandibular bone formation and cartilage-intraosseous bone repair. Through spatial transcriptomic analysis, the molecular expression characteristics were clarified, confirming that FGFR-targeted intervention can repair the bone development defects in the model. FGFR3 was identified as the core regulatory factor for bone repair.
01 Research Background
When the FGFR gene undergoes gain-of-function mutations, it can induce skeletal dysplasia and premature closure of cranial sutures, which are types of skeletal developmental abnormalities. The FGFR signaling pathway plays a central regulatory role in the development and repair of craniofacial bones. Understanding the regulatory mechanism of this gene mutation on mandibular bone repair is of great scientific significance.
02 Main Content
The study analyzed the effects of Fgfr2 and Fgfr3 activation mutations on the development of the mandible and cartilage-intraosseous bone repair in two mouse models. The levels of bone callus mineralization and the differentiation phenotype of chondrocytes were observed. Through spatial transcriptomics, the gene expression and signaling pathway changes in the bone callus of the chondrodysplasia model were analyzed to verify the effect of FGFR-targeted intervention on bone repair defects.
03 Research Design
Two experimental models were constructed: Crouzon syndrome mice with Fgfr2 activation mutations and chondrodysplasia mice with Fgfr3 activation mutations. The levels of bone callus mineralization and the differentiation status of chondrocytes in the two models were compared and detected. Spatial transcriptomics was conducted on the bone callus of chondrodysplasia mice to screen differentially expressed genes and perturbed signaling pathways. FGFR-targeted substances were used to intervene in the models to evaluate the improvement of cartilage-intraosseous bone repair defects.
04 Results
The bone callus mineralization level in Crouzon syndrome mice was abnormally elevated, while that in chondrodysplasia mice was significantly decreased, accompanied by impaired chondrocyte differentiation. The expression of genes related to mature chondrocytes was downregulated in the bone callus of chondrodysplasia mice, and the expression of genes regulating autophagy and apoptosis was significantly disordered. The expression of genes related to the MAPK signaling pathway was upregulated. FGFR-targeted intervention could completely reverse the cartilage-intraosseous bone repair defects in this model, and FGFR3 was identified as the key factor regulating bone repair.
05 Extension of Ideas
Further exploration of the molecular interaction network of FGFR3 in regulating bone repair, analysis of the mechanism of action of its downstream regulatory targets; exploration of the differential regulatory patterns of different FGFR mutation subtypes on craniofacial bone repair; based on this model, further optimize the mode of FGFR-targeted intervention and improve the basic research framework for bone and cartilage dysplasia-related bone repair.
