Oocyte vitrification modifies nucleolar remodeling and zygote kinetics-a sibling study

Purpose Oocyte vitrification does not affect embryo quality after oocyte warming, making this method effective in the preservation of female fertility. Morphokinetic parameters can be used to predict the competence of an embryo produced from fresh oocytes. Our aim was to study the effect of oocyte v...

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Bibliographic Details
Published in:Journal of assisted reproduction and genetics 2015-04, Vol.32 (4), p.581-586
Main Authors: Chamayou, S., Romano, S., Alecci, C., Storaci, G., Ragolia, C., Palagiano, A., Guglielmino, A.
Format: Article
Language:English
Subjects:
Adult
Cell cycle
Cell Nucleolus - physiology
Cryopreservation
Cryopreservation - methods
Embryo Biology
Embryo Transfer - methods
Embryos
Female
Fertility
Fertilization in Vitro - methods
Gynecology
Human Genetics
Humans
In vitro fertilization
Kinetics
Medicine
Medicine & Public Health
Oocytes - growth & development
Ovaries
Pregnancy
Reproductive Medicine
Siblings
Vitrification
Zygote - growth & development
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Summary:Purpose Oocyte vitrification does not affect embryo quality after oocyte warming, making this method effective in the preservation of female fertility. Morphokinetic parameters can be used to predict the competence of an embryo produced from fresh oocytes. Our aim was to study the effect of oocyte vitrification on zygote-embryo kinetics (pl). Methods The embryo-kinetics of fresh and sibling vitrified/warmed oocytes were compared to determine the consequences of oocyte preservation on the timing of embryo development. A 44-hours time-lapse analysis, from the time of ICSI (t0), of 179 fertilized fresh oocytes was compared to 168 fertilized sibling vitrified/warmed oocytes. Results Oocyte vitrification accelerated pronuclear disappearance, one-cell stage timing and modified nucleoli activity by increasing their number and decreasing their diameter at the zygote stage. In contrast, embryo kinetics during cleavage were similar to those observed for fresh sibling oocytes based on the parameters examined in this study. Conclusions At the zygote stage, oocyte vitrification induces changes in pronuclei stability, probably due to pronuclei envelop instability as well as modifications in nucleoli functionality. Therefore, the predictive morphokinetic parameters on embryo competence found from fresh oocytes must be revised when applied on embryos from vitrified/warmed oocytes.
ISSN:1058-0468
1573-7330
DOI:10.1007/s10815-015-0446-x