Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Production of cloned sei whale (Balaenoptera borealis) embryos by interspecies somatic cell nuclear transfer using enucleated pig oocytes | J. Vet. Sci. 2009 10 4 285-292 DOI JOURNAL OF Veterinary Science Production of cloned sei whale Balaenoptera borealis embryos by interspecies somatic cell nuclear transfer using enucleated pig oocytes 1 2 2 3 Eunsong Lee Mohammad Musharraf Uddin Bhuiyan Hiroyuki Watanabe Kohji Matsuoka Yoshihiro 3 3 2 Fujise Hajime Ishikawa Yutaka Fukui School of Veterinary Medicine and Institute of Veterinary Science Kangwon National University Chunchon 200-701 Korea 2Laboratory of Animal Reproduction Obihiro University of Agriculture and Veterinary Medicine Obihiro 080-8555 Japan 3The Institute of Cetacean Research Tokyo 104-0055 Japan In this study we examined the feasibility of using subzonal cell injection with electrofusion for interspecies somatic cell nuclear transfer iSCNT to produce sei whale embryos and to improve their developmental capacity by investigating the effect of osmolarity and macromolecules in the culture medium on the in vitro developmental capacity. Hybrid embryos produced by the electrofusion of fetal whale fibroblasts with enucleated porcine oocytes were cultured in modified porcine zygote medium-3 to examine the effects of osmolarity and fetal serum on their in vitro developmental capacity. More than 66 of the whale somatic cells successfully fused with the porcine oocytes following electrofusion. A portion 60 81 of the iSCNT whale embryos developed to the two- to four-cell stages but no embryos were able to reach the blastocyst stage. This developmental arrest was not overcome by increasing the osmolarity of the medium to 360 mOsm or by the addition of fetal bovine or fetal whale serum. Our results demonstrate that sei whale-porcine hybrid embryos may be produced by SCNT using subzonal injection and electrofusion. The pig oocytes partly supported the remodeling and reprogramming of the sei whale somatic cell nuclei but they were unable to support the development of iSCNT whale embryos to the blastocyst stage. Keywords embryo .
