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Biology of Reproduction, Vol 21, 89-97, Copyright © 1979 by Society for the Study of Reproduction

Number of Cortical Granules in Mouse Oocytes from Inbred Strains Differing in Efficiency of Fertilization

BARBARA WABIK-SacuteLIZ 1

1 Department of Genetics and Evolution, Institute of Zoology, Jagiellonian University, M. Karasia 6, 30-060 Krakow, Poland


The number of cortical granules was estimated in unfertilized oocytes of 4 inbred strains of mice (CBA/Kw, C57BL/Kw, KP and KE) and F1 hybrids (Series 1).

KE oocytes had significantly fewer cortical granules than did the oocytes of the other strains and F1 hybrids. The largest number of cortical granules was found in CBA/Kw oocytes.

The analysis of ovarian and tubal oocytes of KE and CBA/Kw strains before and during ovulation (from 9-13 h after hCG injection, Series II) revealed that in freshly ovulated KE oocytes some cortical granules extrude their contents into the perivitelline space. This premature cortical reaction may be partly responsible for the low efficiency of fertilization that characterizes the KE strain.

Note:
ACKNOWLEDGMENTS I would like to thank Professor Halina Krzanowska for her helpful review and comments on the manuscript and Dr. L. Zamboni for his comments on the electron micrographs. This work was supported by the Polish Academy of Science within the project MR-II/9.

Submitted on January 16, 1978
Accepted on December 21, 1978






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Copyright © 1979 by the Society for the Study of Reproduction.