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. 1976 Jun;73(6):2028–2032. doi: 10.1073/pnas.73.6.2028

Induction of maturation (meiosis) in small Xenopus laevis oocytes by injection of maturation promoting factor.

J Hanocq-Quertier, E Baltus, J Brachet
PMCID: PMC430441  PMID: 1064873

Abstract

Treatment of small-(stage III) or medium-sized (stage IV) Xenopus laevis oocytes with progesterone, human chorionic gonadotropin, or para-hydroxymercuriphenylsulfonate does not induce maturation. Only the full-grown oocytes (stage VI) undergo maturation when treated with either one of these three substances. In contrast, injection of maturation promoting factor into oocytes of stages III-VI invariably leads to chromosome condensation and germinal vesicle breakdown. No maturation spindle is found in oocytes smaller than 0.9 nm in diameter, and the nuclear sap does not mix with the cytoplasm in the smallest (0.45-0.55 mm in diameter) oocytes. In oocytes of 0.9 mm, maturation is identical to that of full-grown oocytes, except that the maturation spindle does not reach the cortex of the oocyte. Progesterone increases protein synthesis in medium-sized (0.8 mm in diameter) oocytes without inducing meiosis. It has little or no effect on protein synthesis in smaller oocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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