Hum. Reprod. Advance Access originally published online on April 7, 2005
Human Reproduction 2005 20(7):1958-1968; doi:10.1093/humrep/dei003
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Developmental incompetency of denuded mouse oocytes undergoing maturation in vitro is ooplasmic in nature and is associated with aberrant Oct-4 expression
Program for In Vitro Fertilization, Reproductive Surgery and Infertility, New York University School of Medicine, New York, NY 10016, USA,
1 To whom correspondence should be addressed at: 660 First Avenue, Fifth Floor, New York, NY 10016, USA. Email: kreyivf{at}yahoo.com
BACKGROUND: Germinal vesicle (GV) oocytes constitute a potential resource but their developmental competence is questionable especially when surrounding cumulus cells are removed. The intercellular factors/mechanisms underlying such poor embryonic competence may originate at a nuclear and/or ooplasmic level. METHODS: Immature or mature oocytes were obtained from three mouse strains following pregnant mare serum gonadotropin (PMSG) or PMSG+ human chorionic gonadotropin (hCG) treatment. Immature oocytes were denuded of cumulus cells prior to in vitro maturation. Pronuclear (PN) transfer was used to examine nuclear–ooplasmic interplay on resultant embryonic development and Oct-4 immuno-staining patterns. RESULTS: Embryos arising from ooplasts of in vivo matured oocytes displayed significant increases in blastocyst formation rates and total blastomere numbers when compared to those created from ooplasts of denuded oocytes. Oct-4 staining was more pronounced and restricted to the inner cell mass (ICM) in blastocysts arising from the ooplasm of in vivo matured zygotes than in those created from denuded oocytes. CONCLUSIONS: Developmental defect(s) appear to develop primarily in the ooplasm of oocytes that are denuded of their cumulus cells prior to in vitro maturation. Such oocytes result in embryos with poor developmental competence. These defects result in anomalies in cell number and Oct-4 expression during the morula–blastocyst developmental transition.
Key words: denuded oocyte/in vitro maturation/Oct-4/ooplasm/pronuclear transfer
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