Definition:

Carey-Fineman-Ziter syndrome (CFZS) is a rare multiple congenital anomalies syndrome defined by a combination of Pierre Robin syndrome and Moebius syndrome, associated with hypotonia and various other malformations. Pierre Robin syndrome is characterized by a triad of micrognathia, glossoptosis and a U-shaped cleft palate. Moebius syndrome is characterized by congenital palsy of the 6th and 7th cranial nerves. It has been reported that autosomal recessive mutations in MYMK cause CFZS. Myomaker, encoded by MYMK, is expressed on the cell surface of myoblasts during fusion. Fusion of myoblasts is essential for the formation of multi-nucleated muscle fibres.