Test Details: Achondroplasia comes from the genetic point mutations in the fibroblastic growth factor receptor 3 gene (FGFR3), which enables abnormal cartilage growth-plate differentiation and insufficient bony development. A single variant in the FGFR3 gene has been shown to cause Muenke syndrome, which is a condition that causes craniosynostosis and leads to a misshapen head and distinctive facial features. Additional signs and symptoms can include hearing loss, subtle hand and foot abnormalities, and developmental delays.