[Desynchronization of cell division during the early development of the axoloty, loach and salmon]

Patterns of a relative measure of asynchrony R of the cell population have been studied by means of a mathematical model of the kinetics of cell population which allows to follow the distribution of cells by the mitotic cycle phases in time. The application of the criterion R for the analysis of the patterns of desynchronization of cell divisions in the early embryogenesis of axolotl, loach and salmon has shown, that, unlike the smooth change of the asynchrony measure in the model populations with one constant factor desynchronization, the desynchronization in the species in question proceeds step-wise and runs to 3 steps. The problem of relationship between desynchronization and cytoplasmic segregation, decrease of electric coupling among cells and rearrangement of cell cycle is discussed. It was shown that the latter might occur in different species at a different degree of desynchronization.