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. 1989 Nov 30;342(6249):512-8.
doi: 10.1038/342512a0.

The c-mos proto-oncogene product is a cytostatic factor responsible for meiotic arrest in vertebrate eggs

N Sagata  1 , N Watanabe, G F Vande Woude, Y Ikawa
Affiliations

The c-mos proto-oncogene product is a cytostatic factor responsible for meiotic arrest in vertebrate eggs

N Sagata et al. Nature. .

Abstract

The c-mos proto-oncogene product, pp39mos, is present in unfertilized Xenopus eggs, and disappears on fertilization. Microinjection of synthetic mos RNA into two-cell embryos induces cleavage arrest at metaphase. By contrast, egg cytosol extracts, when immunodepleted of endogenous pp39mos, lose their cleavage-arresting activity in injected embryos. These results demonstrate that Mos protein is the cytostatic factor CSF, long known as an endogenous meiotic inhibitor in vertebrate eggs.

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