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Effects of Donor Cells and Estrus Synchronization on the Production of Cloned Korean Native Goat  

Park H.S. (Department of Animal Science and Biotechnology & RAIRC, Jinju National University)
Kim T.S. (Department of Animal Science and Biotechnology & RAIRC, Jinju National University)
Jung S.Y. (Department of Animal Science and Biotechnology & RAIRC, Jinju National University)
Park J.K. (Gyeongnam Swine Research Institute)
Lee J.S. (Department of Animal Science and Biotechnology & RAIRC, Jinju National University)
Jung J.Y. (Department of Animal Science and Biotechnology & RAIRC, Jinju National University)
Publication Information
Journal of Embryo Transfer / v.21, no.2, 2006 , pp. 137-146 More about this Journal
Abstract
The objective of this study was to examine the effect of donor cell types, the source of recipient oocytes and estrous synchronization on pregnancy and delivery rates of somatic cell nuclear transfer (SCNT) embryos in Korean native goats. Recipient oocytes were surgically collected after superovulation. Ear cells and fetal fibroblasts were collected and cultured in serum-starvation condition (TCM-199 + 0.5% FBS) for cell confluence. The zonae pellucidae of in vivo- and in vitro-matured oocytes were partially drilled using a laser system. Single somatic cell was transferred into the enucleated oocyte. The reconstructed oocytes were electrically fused with 0.3 M mannitol. After the fusion, embryos were activated by Ionomycin+6-DMAP. NT embryos were cultured in mSOF medium supplemented with 0.8% BSA at $39^{\circ}C$ in an atmosphere of 5% $CO_2$, 5% $O_2$, 90% $N_2$ for 12 to 20 hr. One hundred and two SCNT embryos were transferred into 20 recipients and pregnancy rate at days 30 was 20.0%. Of them, one developed to term and delivered 1 kid. Ear cells showed significantly higher fusion (63.8 vs. 26.5%) and pregnancy rates (20.0 vs. 0.0%) than those of fetal fibroblast (p<0.05). The recipients synchronized by CIDR showed significantly lower pregnancy rates compared to that of recipient in natural estrus ($0.0{\sim}25.0%$ vs. 100%) (p<0.05). Cloned kid was born from the recipient in natural estrus. For the synchronization of estrus between recipient and donor, there was no difference between treatments (${\pm}0$ vs. +12 hr) in pregnancy rate. The first healthy cloned kid (Jinsoonny) was produced by transfer of SCNT embryos derived from in vivo oocytes and ear cells into a recipient goat whose estrus was synchronized with the donor. These results imply that donor cells for nuclear transfer may affect the success rate, and the estrus synchronization between donor and recipient animals can also be important.
Keywords
somatic cell; nuclear transfer; fusion; activation; cleavage; in vivo; goat;
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