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- W1993323902 abstract "The poor efficiency of mammalian cloning is due to inappropriate/incomplete epigenetic reprogramming of the donor chromatin. As the success in reprogramming of the donor nucleus may require activity of similar mechanisms which reprogram the chromatin in the course of gametogenesis, we decided to follow the status of some epigenetic markers in the late phase of oogenesis in mice, i.e. in prophase oocytes during their growth and after completion of the growth phase. Our analysis reveals an increase in the level of global DNA methylation starting in oocytes with diameters around 60 microm which was further elevated until completion of oocyte growth. A similar increase was observed in respect to the acetylation of histone H4. On the other hand, the methylation of histone H4 Arg3 was constantly high until the end of oocyte growth, although it differed between fully grown oocytes depending on the type of spatial chromatin organization. We have also studied the AKAP95 protein which was abundant at earlier stages but decreased in fully grown oocytes according to changes in their chromatin organization. The nuclear transfer of different types of donor nuclei with hypomethylated DNA into fully grown prophase oocytes did not increase the global level of methylation of transferred foreign chromatin, regardless if the recipient oocyte was devoid of its own nucleus or its nucleus was left intact. This suggests a major problem in the ability of recipient oocytes to modify donor DNA methylation." @default.
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- W1993323902 date "2012-07-30" @default.
- W1993323902 modified "2023-09-26" @default.
- W1993323902 title "DNA Methylation, Histone Modifications and Behaviour of AKAP95 during Mouse Oocyte Growth and Upon Nuclear Transfer of Foreign Chromatin into Fully Grown Prophase Oocytes" @default.
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- W1993323902 doi "https://doi.org/10.3409/fb60_3-4.163-170" @default.
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