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Dynamics of DNA-demethylation in early mouse and rat embryos developed in vivo and in vitro

Item Type:Article
Title:Dynamics of DNA-demethylation in early mouse and rat embryos developed in vivo and in vitro
Creators Name:Zaitseva, I. and Zaitsev, S. and Alenina, N. and Bader, M. and Krivokharchenko, A.
Abstract:Virtually all mammalian species including mouse, rat, pig, cow, and human, but not sheep and rabbit, undergo genome-wide epigenetic reprogramming by demethylation of the male pronucleus in early preimplantation development. In this study, we have investigated and compared the dynamics of DNA demethylation in preimplantation mouse and rat embryos by immunofluorescence staining with an antibody against 5-methylcytosine. We performed for the first time a detailed analysis of demethylation kinetics of early rat preimplantation embryos and have shown that active demethylation of the male pronucleus in rat zygotes proceeds with a slower kinetic than that in mouse embryos. Using dated mating we found that equally methylated male and female pronuclei were observed at 3 hr after copulation for mouse and 6 hr for rat embryos. However, a difference in methylation levels between male and female pronuclei could be observed already at 8 hr after copulation in mouse and 10 hr in rat. At 10 hr after copulation, mouse male pronuclei were completely demethylated, whereas rat zygotes at 16 hr after copulation still exhibited detectable methylation of the male pronucleus. In addition in both species, a higher DNA methylation level was found in embryos developed in vitro compared to in vivo, which may be one of the possible reasons for the described aberrations in embryonic gene expression after in vitro embryo manipulation and culture.
Keywords:DNA Methylation, Preimplantation Embryos, In Vivo Development, In Vitro Cultivation, Animals, Mice, Rats
Source:Molecular Reproduction and Development
Page Range:1255-1261
Date:October 2007
Official Publication:https://doi.org/10.1002/mrd.20704
PubMed:View item in PubMed

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