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Mutations in FAM20C were recently identified as the cause of lethal osteosclerotic bone dysplasia, which highlighted the important role of this molecule in biomineralization. No systematic studies have been performed to evaluate the expression pattern of this relatively new molecule in the developmental processes of bone and tooth. In the present study, we analyzed in detail the expression profile of FAM20C during osteogenesis and odontogenesis using ISH and IHC approaches. The specimens analyzed were mouse tissues spanning embryonic day 13.5 (E13.5) to postnatal 8 weeks. The earliest presence of FAM20C was observed at E14.5. During osteogenesis, FAM20C mRNA was detected in the chondrocytes and osteoblasts of the long bone, whereas its protein was observed in the extracellular matrix (ECM) of bone and in the cytoplasm of the chondrocytes, osteoblasts, and osteocytes. During odontogenesis, FAM20C mRNA was detected in the ameloblasts, odontoblasts, cementoblasts, and periodontal ligament fibroblasts, whereas its protein was observed in the matrices of dentin, enamel, and alveolar bone and in the cytoplasm of the aforementioned cells. The temporospatial expression profile revealed in this study indicates that FAM20C is an ECM protein that may play an important role in controlling the mineralization of bone and tooth.

Expression of FAM20C in the Osteogenesis and Odontogenesis of Mouse