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Interspecies Nuclear Transfer using Bovine Oocytes Cytoplasm and Somatic Cell Nuclei from Bovine, Porcine, Mouse and Human  

박세영 (마리아 기초의학연구소/마리아 생명공학연구소)
김은영 (마리아 기초의학연구소/마리아 생명공학연구소)
이영재 (마리아 기초의학연구소/마리아 생명공학연구소)
윤지연 (마리아 기초의학연구소/마리아 생명공학연구소)
길광수 (마리아 기초의학연구소/마리아 생명공학연구소)
김선균 (마리아 기초의학연구소/마리아 생명공학연구소)
이창현 (건국대학교 축산대학)
정길생 (마리아 기초의학연구소/마리아 생명공학연구소)
박세필 (마리아 병원)
Publication Information
Abstract
This study was designed to examine the ability of the bovine (MII) oocytes cytoplasm to support several mitotic cell cycles under the direction of differentiated somatic cell nuclei of bovine, porcine, mouse and human. Bovine GV oocytes were matured in TCM-199 supplemented with 10% FBS. At 20h after IVM, recipient oocytes were stained with 5 $\mu\textrm{g}$/$m\ell$ Hoechst and their 1st polar body (PB) and MII plate were removed by enucleation micropipette under UV filter. Ear skin samples were obtained by biopsy from an adult bovine, porcine, mouse and human and cultured in 10% FBS added DMEM. Individual fibroblast was anlaysed chromosome number to confirm the specificity of species. Nuclear transferred (NT) units were produced by electrofusion of enucleated bovine oocytes with individual fibroblast. The reconstructed embryos were activated in 5 $\mu$M ionomycin for 5 min followed by 1.9 mM 6-dimethylaminopurine (DMAP) in CR1aa for 3 h. And cleaved NT embryos were cultured in CR1aa medium containing 10% FBS on monolayer of bovine cumulus cell for 8 days. Also NT embryo of 4~8 cell stage was analysed chromosome number to confirm the origin of nuclear transferred somatic cell. The rates of fusion between bovine recipient oocytes and bovine, porcine, mouse and human somatic cells were 70.2%, 70.2%, 72.4% and 63.0%, respectively. Also, their cleavage rates were 60.6%, 63.7%, 54.1% and 62.7%, respectively, there were no differences among them. in vitro development rates into morula and blastocyst were 17.5% and 4.3% in NT embryos from bovine and human fibroblasts, respectively. But NT embryos from porcine and mouse fibroblasts were blocked at 16~32-cell stage. The chromosome number in NT embryos from individual fibroblast was the same as chromosome number of individual species. These results show that bovine MII oocytes cytoplasm has the ability to support several mitotic cell cycles directed by newly introduced nuclear DNA.
Keywords
Interspecies nuclear transfer; Bovine oocytes; Cytoplasm, Somatic cell; Chromosome number;
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