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Frontiers in Biology

ISSN 1674-7984

ISSN 1674-7992(Online)

CN 11-5892/Q

Front Biol    2010, Vol. 5 Issue (5) : 439-444    https://doi.org/10.1007/s11515-010-0840-9
REVIEW
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.

Keywords DNA methylation      nuclear transfer      DNA methyltransferase 3a      DNA methyltransferase 3b     
Corresponding Author(s): WANG Liu,Email:wangliu@ioz.ac.cn   
Issue Date: 01 October 2010
 Cite this article:   
Xiangpeng DAI,Xiaoyang ZHAO,Hai TANG, et al. 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[J]. Front Biol, 2010, 5(5): 439-444.
 URL:  
https://academic.hep.com.cn/fib/EN/10.1007/s11515-010-0840-9
https://academic.hep.com.cn/fib/EN/Y2010/V5/I5/439
Fig.1  DNA methylation intensity of different embryonic stem (ES) cells. A: The global DNA methylation level of J1 ES cell; B: The global DNA methylation level of DKO; C: The global DNA methylation level of 3aKO; D: The global DNA methylation level of 3bKO. Bars= 20 μm.
Fig.1  DNA methylation intensity of different embryonic stem (ES) cells. A: The global DNA methylation level of J1 ES cell; B: The global DNA methylation level of DKO; C: The global DNA methylation level of 3aKO; D: The global DNA methylation level of 3bKO. Bars= 20 μm.
donor cellPN2 cell/%4 cell/%morula/%blastocysts/%
DKO315315(100)276(87.6)a223(75.5±2.13)a174(55.6±2.88)a
3bKO616580(94.2)563(97.1)a420(71.7±3.22)a279(49.0±2.68)ab
3aKO597597(100)552(92.5)a368(61.0±3.59)b268(43.5±6.18)bc
J1786786(100)716(91.1)a462(57.4±3.25)b308(36.9±2.44)c
Tab.1  Pre-implantation development of ES-NT embryos
donor cellrecipientblastocyst transferredimplantation(% blastocysts transferred)embyos(% implantation)embryos(% blastocysts transferred)
DKO19207153(73.9)a79(51.6)A79(38.1)A
J130340266(78.2)a66(24.8)B66(19.4)B
Tab.2  Post-implantation development of ECNT embryos
ES cells2 cellblastocyst(%)attachment (%)degeneration (%)outgrowth (%)ES cell line (% 2 cell)ES cell line (% B)
DKO3322(66.7)a20(90.9)a5(25.0)a15(68.2)a6(18.2)a6(27.3)a
J16125(40.9)b19(76.0)a4(21.1)a15(60.0)a15(24.6)a15(60.0)b
Tab.3  Establishment of NT-ES cells from DKO and J1 ES cell cloned blastocysts
Fig.2  Expression of Dmnt3a and Dnmt3b in NT-ES cells derived from J1 and DKO cloned blastocysts. A: Expression of Dnmt3a in ES cell derived from DKO cloned blastocyst; B: Expression of Dnmt3b in ES cell derived from DKO cloned blastocysts; C: Expression of Dnmt3a in ES cell derived from J1 cloned blastocyst; D: Expression of Dnmt3b in ES cell derived from J1 cloned blastocyst. Bars= 20 μm.
Fig.2  Expression of Dmnt3a and Dnmt3b in NT-ES cells derived from J1 and DKO cloned blastocysts. A: Expression of Dnmt3a in ES cell derived from DKO cloned blastocyst; B: Expression of Dnmt3b in ES cell derived from DKO cloned blastocysts; C: Expression of Dnmt3a in ES cell derived from J1 cloned blastocyst; D: Expression of Dnmt3b in ES cell derived from J1 cloned blastocyst. Bars= 20 μm.
Fig.3  Expression of Oct4 (red) and CDX2 (green) in DKO, 3bKO, 3aKO, J1 cloned blastocyst and E6.5 embryo. A: DKO cloned blastocyst; B: 3bKO cloned blastocyst; C: 3aKO cloned blastocyst; D: J1 ES cell cloned blastocyst; E: DKO cloned E6.5 embryo; F: J1 cloned E6.5 embryo.
Fig.3  Expression of Oct4 (red) and CDX2 (green) in DKO, 3bKO, 3aKO, J1 cloned blastocyst and E6.5 embryo. A: DKO cloned blastocyst; B: 3bKO cloned blastocyst; C: 3aKO cloned blastocyst; D: J1 ES cell cloned blastocyst; E: DKO cloned E6.5 embryo; F: J1 cloned E6.5 embryo.
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