Production of transgenic cloned piglets from genetically transformed fetal fibroblasts selected by green fluorescent protein

Gab Sang Lee, Hye Soo Kim, Sang Hwan Hyun, So Hyun Lee, Hyun Yong Jeon, Dong Hyun Nam, Yeon Woo Jeong, Sue Kim, Ji Hye Kim, Jae Yong Han, Curie Ahn, Sung Keun Kang, Byeong Chun Lee, Woo Suk Hwang

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


This study was performed to develop a system for porcine somatic cell nuclear transfer (SCNT) and to produce human erythropoietin (hEPO)-transgenic cloned piglets. Porcine fetal fibroblasts were transfected with an expression plasmid (phEPO-GFP). In Experiment 1, the effect of transfection of phEPO-GFP transgene on development of porcine SCNT embryos was investigated. Three fetal fibroblast cell lines (two male and one female) with or without transfected with phEPO-GFP trasngene were used as donor cells for SCNT. Lower fusion rates were observed in two lines of transfected cells as compared to those of the control cells. In Experiment 2, the effect was examined of elevated Ca2+ concentration in the fusion/activation medium on development of transfected SCNT embryos. The rates of fusion and blastocyst formation were significantly increased by supplementing 1.0 mM of CaCl2 (versus 0.1 mM) into the fusion/activation medium. In Experiment 3, the effect was studied of a chemical treatment (cytochalasin B) after electric fusion/activation (F/A) on porcine transgenic SCNT embryo development. The electric F/A + cytochalasin B treatment increased total cell number in blastocysts as compared to that of electric F/A treatment alone. In Experiment 4, transgenic cloned embryos were transferred to surrogate mothers and a total of six cloned piglets were born. Transgenic cloned piglets were confirmed by polymerase chain reaction and Southern blot analysis. From a single surrogate mother, female and male transgenic cloned piglets were produced by transferring pooled SCNT embryos derived from female and male transfected donor cells. In conclusion, a system for porcine SCNT was developed and led to the successful production of hEPO transgenic cloned piglets.

Original languageEnglish (US)
Pages (from-to)973-991
Number of pages19
Issue number4
StatePublished - Mar 1 2005
Externally publishedYes


  • EPO
  • Embryos
  • Nuclear transfer
  • Porcine
  • Reproductive technologies
  • Topic category form
  • Transgenic

ASJC Scopus subject areas

  • Small Animals
  • Food Animals
  • Animal Science and Zoology
  • Equine


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