Recruit of porcine oocytes excluded from nuclear transfer program for the production of embryos following parthenogenetic activation

Sanghwan Hyun, Byeongchun Lee, Gabsang Lee, Eunsong Lee, Jeongmook Lim, Sungkeun Kang, Woosuk Hwang

Research output: Contribution to journalArticlepeer-review


To evaluate whether oocytes excluded from somatic cell nuclear transfer (SCNT) could be utilized for embryo production by parthenogenetic activation (PA), porcine oocytes with poor morphology after maturation culture were excluded from SCNT and subsequently used for PA with different stimuli. In the first set of experiment, either electric pulse of different strengths (1.75, 2.0 or 2.25 kV/cm for 30 μsec each) or chemicals with different treatment durations [7% ethanol for 5 min followed by exposure to 6-dimethylaminopurine (6-DMAP) for 0, 2, 3 or 4 hr] was employed. Development to the 8-cell and morula stages was significantly (P<0.05) improved by electric stimulation of 2.0 kV/cm, while blastocyst formation was enhanced by chemical treatment of ethanol and 6-DMAP for 4 hr. Subsequently, oocytes were parthenogenetically activated by one of four stimuli; 1) optimal electric (2.0 kV/cm for 30 μsec), 2) optimal chemical (ethanol followed by 6-DMAP for 4 hr), 3) electric then chemical and 4) vice versa. On the other hand, oocytes with normal morphology were subjected to the same experimental treatments for the control. Regardless of oocyte type, a combination of electric and chemical stimulations did not further stimulate preimplantation development, compared with electric activation only. However, combinational treatment greatly increased the cell number of blastocysts in SCNT-excluded oocytes (21.9 to 22.9 vs. 16.9 cells/blastocyst), while such effect was not found in normal oocytes (22.2 to 23.3 cells/blastocyst). In conclusion, porcine oocytes excluded from SCNT still have a potential to develop blastocysts after PA and this might contribute to increasing the efficiency of SCNT for various purposes. A combined activation by electricity and chemical yielded the best rate of preimplantation development with increasing the quality of blastocyst.

Original languageEnglish (US)
Pages (from-to)51-56
Number of pages6
JournalJournal of Veterinary Medical Science
Issue number1
StatePublished - Jan 2003
Externally publishedYes


  • In vitro-matured oocyte
  • Normality
  • Parthenogenesis
  • Porcine
  • Preimplantation development

ASJC Scopus subject areas

  • veterinary(all)


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