Sperm penetration at the maturing metaphase I stage can trigger oocyte activation in a mouse model.

Autor: Chang CC; Reproductive Biology Associates, Atlanta, GA, USA., Peng M; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Tsai LK; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Chang CC; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Li CJ; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Wu CK; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Chien CC; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China., Xu J; Center for Advanced Models for Translational Sciences and Therapeutics, University of Michigan Medical School, Ann Arbor, MI, USA., Nagy ZP; Reproductive Biology Associates, Atlanta, GA, USA., Liu CH; Nuwa Fertility Centre, Taiwan, Taipei, Republic of China., Lu CH; Nuwa Fertility Centre, Taiwan, Taipei, Republic of China. Electronic address: d95642001@gmail.com., Sung LY; Institute of Biotechnology, National Taiwan University, Taipei, Taiwan, Republic of China; Centre for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan, Republic of China; Agricultural Biotechnology Research Centre, Academia Sinica, Taipei, Taiwan, Republic of China. Electronic address: liyingsung@ntu.edu.tw.
Jazyk: angličtina
Zdroj: Reproductive biomedicine online [Reprod Biomed Online] 2024 Dec; Vol. 49 (6), pp. 104329. Date of Electronic Publication: 2024 Jun 21.
DOI: 10.1016/j.rbmo.2024.104329
Abstrakt: Research Question: Can spermatozoa penetrate maturing metaphase I (MI) oocytes, and render subsequent development following conventional IVF in a mouse model?
Design: ICR mice were used in this study. Metaphase II (MII) cumulus-oocyte complexes (COC) harvested 15 h after injection of human chorionic gonadotrophin (HCG) were used for IVF as the control group (Group 1). In the treatment group (Group 2), maturing MI COC harvested 7 h after HCG injection were used for IVF. Fertilization, pronuclear formation, cleavage, blastocyst formation, DNA methylation status, chromosome number and live birth rates were used to evaluate the developmental dynamics and competency of maturing MI oocytes following conventional IVF.
Results: Maturing MI COC were fertilized using conventional IVF, and sperm penetration at MI-telophase I triggered oocyte activation. Most embryos resulting from fertilized MI oocytes developed to blastocyst stage during preimplantation development, albeit a substantial proportion of them were triploids due to the absence of the second meiotic division. Some of the embryos derived from fertilization of maturing oocytes were able to implant and gave rise to full-term development.
Conclusion: Maturing MI COC from follicles before ovulation could be used for mouse IVF, and fertilized MI oocytes had high potential for development. Healthy offspring can be generated from maturing MI COC following conventional IVF. MI COC may represent a valuable source of 'usable' biomaterial in assisted reproduction. However, many embryos derived from MI COC via IVF have abnormal chromosome numbers in the mouse model. The implications of these findings for human IVF remain to be investigated.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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