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Development, Vol 109, Issue 2 323-328, Copyright © 1990 by Company of Biologists

JOURNAL ARTICLES

The role of the nucleocytoplasmic ratio in development regulation of the early mouse embryo

SV Evsikov, LM Morozova and AP Solomko
Laboratory of Biochemical Genetics, Academy of Sciences of the Ukrainian SSR, Kiev.

The hypothesis suggesting that the blastocoele is able to form only at a definite nucleocytoplasmic ratio was tested. We compared the development of preimplantation mouse embryos under different conditions. The results demonstrated that the start of cavitation is not dependent on the number of cell divisions. Thus, a definite nucleocytoplasmic ratio is not required for blastocoele formation to start. Our studies on embryos with microsurgically altered cytoplasm content provided evidence for the following biological clock mechanism: a change in the cell program of morphogenesis needs definite concentration of the products of a previous genetic program.
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© The Company of Biologists Ltd 1990