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Efficiency of two enucleation methods connected to handmade cloning to produce transgenic porcine embryos

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  • J Li, Denmark
  • K Villemoes, Denmark
  • Y Zhang, Denmark
  • Y Du, Denmark
  • P M Kragh, Denmark
  • S Purup
  • Q Xue, James D. Watson Institute of Genome Sciences, Zhejiang University, Hangzhou, China
  • A M Pedersen
  • Arne Lund Jørgensen, Denmark
  • Jannik E. Jakobsen, Denmark
  • Lars Bolund
  • H Yang, James D. Watson Institute of Genome Sciences, Zhejiang University, Hangzhou, China
  • G Vajta, Denmark
  • Cellevægsbiologi og Molekylær Virologi
  • Nutrition and Production Physiology
  • Department of Genetics and Biotechnology
  • Department of Animal Health and Bioscience
  • Populationsgenetik og Embryologi
  • Department of Human Genetics
The purpose of our work was to establish an efficient-oriented enucleation method to produce transgenic embryos with handmade cloning (HMC). After 41â€"42 h oocytes maturation, the oocytes were further cultured with or without 0.4 μg/ml demecolcine for 45 min [chemically assisted handmade enucleation (CAHE) group vs polar body (PB) oriented handmade enucleation (OHE) group respectively]. After removal of the cumulus cells and partial digestion of the zona pellucida, oocytes with visible extrusion cones and/or polar bodies attached to the surface were subjected to oriented bisection. Putative cytoplasts without extrusion cones or PB were selected as recipients. Two cytoplasts were electrofused with one transgenic fibroblasts expressing green fluorescent protein (GFP), while non-transgenic fibroblasts were used as controls. Reconstructed embryos were cultured in Well of Wells (WOWs) with porcine zygote medium 3 (PZM-3) after activation. Cleavage and blastocyst rates were registered on day 2 and day 7 of in vitro culture respectively. Meanwhile, the total blastocyst cell number was counted on day 7. We found that the difference was only observed between blastocyst rates (38.6 ± 2% vs 48.1 ± 3%) of cloned embryos with GFP transgenic fibroblast cells after CAHE vs OHE. With adjusted time-lapse for zonae-free cloned embryos cultured in WOWs with PZM-3, it was obvious that in vitro developmental competence after CAHE was compromised when compared with the OHE method. OHE enucleation method seems to be a potential superior alternative method used for somatic cell nuclear transfer (SCNT) with transgenic fibroblast cells
Original languageEnglish
JournalReproduction in Domestic Animals
Pages (from-to)122-7
Number of pages5
Publication statusPublished - 2009

    Research areas

  • oocytes, enucleation, cloning, embryo development, pig

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