Cell constancy

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As eutely or Eutelie refers to the biological phenomenon that some organisms or organs a well-defined, fixed number of cells possess.

Cell constancy is often proven especially for roundworms (Nematoda). Every hermaphrodite of the species Caenorhabditis elegans consists of exactly 959 cells, as John E. Sulston and other researchers have demonstrated since 1977. Initially 1090 cells are formed in ontogenesis , of which 131 cells die a programmed cell death. In the meantime, each cell in this species has its own specific name. The development of each cell can be precisely predicted or traced. Therefore, this species is particularly important as a model organism for research into the genetic basis of development and gene regulation .

Eutelia is not only found in roundworms, it is also found in some tardigrade , rotifers and other small invertebrates.

Eutelie has clear consequences for the corresponding living beings. The ability to regenerate is greatly reduced, so that even minor injuries can lead to death. On the other hand, are cancer - tumors largely impossible because the cells have lost their ability to divide.