| Modification Notes |
The novel basic helix-loop-helix (bHLH) transcription factor, twist, is a putative regulator of mesodermal differentiation and myogenesis. Twist is expressed throughout the epithelial somite but not in the myotome. Twist requires dimerization with E proteins, such as Paraxis, and inhibits myogenic regulatory factors. As an early transcriptional regulator, Paraxis determines the mesoderm pattern and governs the type of mesoderm-derived cells. Paraxis is also involved in the regulaton of morphogenetic activites during somitogenesis. Paraxis, a nuclear protein containing one bHLH domain, requires dimerization with another protein in order to bind DNA efficiently. |