has part has characteristic muscle cell striated muscle cell myotube 2010-09-24T01:13:01Z FBbt:00005812 myofibril A transversely striated, multinucleated syncytial muscle cell, formed by the fusion of myoblasts during muscle development. Myotubes are multinucleated cells and are categorized under the umbrella of skeletal muscle cells. They are formed through an intricate process known as myogenesis, which is a part of skeletal muscle development. It is vital to note that myotubes are not terminally differentiated but are precursors to mature muscle fiber cells. Myotubes come to life through the fusion of myoblasts, which are undifferentiated mononucleated progenitor cells. In the early stages of embryonic muscle development, myoblasts proliferate rapidly under the influence of growth and differentiation factors. As myoblasts reach confluence, they withdraw from the cell cycle, align themselves with each other, increase expression of muscle-specific proteins, and ultimately fuse to form myotubes. The formation of myotubes heralds a critical transition, as this is when cells shift from proliferation and growth to differentiation and maturation. Functionally, myotubes play a critical role in the formation and development of skeletal muscles. Myotubes gradually grow in size through the incorporation of additional myoblasts and eventually mature into muscle fibers, the contractile units of skeletal muscles. During this maturation process, myotubes polymerize their soluble muscle-specific proteins into myofibrils, which are essential for muscle contraction. Overall, myotubes are vital players in the complex process of muscle development and homeostasis. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) https://cellxgene.cziscience.com/cellguide/CL_0002372 myotube myofiber syncytial cell sarcomere multinucleate transversely striated