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Cloning efficiency following ES cell nuclear transfer is influenced by the methylation state of the donor nucleus altered by mutation of DNA methyltransferase 3a and 3b |
Xiangpeng DAI1,2, Xiaoyang ZHAO1,2,3, Hai TANG1,2, Jie HAO1,2,3, Jean-Paul RENARD2,4, Qi ZHOU1,2, Alice JOUNEAU2,4, Liu WANG1,2( ) |
1. State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; 2. Sino-French Laboratory LABIOCEM, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; 3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China.; 4. INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy en Josas, France ENVA, Maison-Alfort, France |
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Abstract The epigenetic state of donor cells plays a vital role in the nuclear reprogramming and chromatin remodeling of cloned embryos. In this study we investigated the effect of DNA methylation state of donor cells on the development of mouse embryos reconstructed with embryonic stem (ES) cell nuclei. Our results confirmed that deletion of the DNA methyltransferase 3a (Dnmt3a) and DNA methyltransferase 3b (Dnmt3b) distinctly decreases the level of DNA methylation in ES cells. In contrast to wild type ES cells (J1), Dnmt3a-/-3b-/- (DKO) and Dnmt3b-/- (3bKO) donor cells significantly elevated the percentage of embryonic stem cell nuclear transfer (ECNT) morula, blastocysts and postimplantation embryos (P<0.05). However, the efficiency of establishment of NT-ES cell lines derived from DKO reconstructed blastocysts was not improved, and the expression pattern of OCT4 and CDX2 in cloned blastocysts and postimplantation embryos was not altered either. Our results suggest that the DNA methylation state of the donor nucleus is an important factor in regulation of the donor nuclear reprogramming.
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Keywords
DNA methylation
nuclear transfer
DNA methyltransferase 3a
DNA methyltransferase 3b
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Corresponding Author(s):
WANG Liu,Email:wangliu@ioz.ac.cn
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Issue Date: 01 October 2010
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