Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of Oocyte Activation Regimens on Ploidy of Nuclear Transfer Embryos Reconstructed with Fetal Fibroblasts in Rabbit

  • Yoo, Jae-Gyu (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Rho, Gyu-Jin (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
  • Received : 2006.08.25
  • Accepted : 2007.01.17
  • Published : 2007.05.01
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Abstract

Considerable attention has been focused on the cloning of mammalian embryos, as a consequence of poor development, in order to enhance the application of genetic engineering. Experiments were conducted to compare the developmental competence of parthenotes and reconstructed (NT) rabbit eggs with fetal fibroblasts (FFs) following various activation regimens. Oocytes and NT eggs were exposed to: electric stimulation (EST, Group 1) and EST followed by 6-dimethylaminopurine (DMAP, Group 2), cycloheximide (CHX, Group 3) or DMAP/CHX (Group 4). Pronuclear (PN) status, cleavage, blastocyst development and the ploidy were assessed. In parthenote groups 1, 2, 3 and 4, the PN formation differed significantly. And, the cleavage and blastocyst rates were 41.7 and 5%, 75.6 and 53.7%, 68 and 36%, 82.1 and 52.6%, respectively, among treatments. Polyploidy was observed in 17.2% of EST plus DMAP and 44.9% of EST plus DMAP/CHX groups. In SCNT groups (Group 1, 2, 3 and 4), the cleavage and blastocyst rates were 28.6 and 7.1%, 58.3 and 29.2%, 56.8 and 24.1%, 64.5 and 27.8%, respectively. The chromosomal composition differed significantly (p<0.05) among treatments. In Group 2 and 3, 53.8% and 81.8% of embryos revealed diploid chromosomal sets, respectively. However, in Group 4, 53.3% of embryos showed abnormal ploidy (mixoploid). Although DMAP or combination with DMAP/CHX resulted in higher in vitro development of rabbit SCNT embryos, higher incidence of chromosomal abnormality may induce problems related to fetal loss of at late stage of development.

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References

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