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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Epigenetic characterization of the PBEF and TIMP-2 genes in the developing placentae of normal mice

  • Kim, Hong-Rye (Department of Animal Science & Biotechnology, Research Center for Transgenic Cloned Pig, Chungnam National University) ;
  • Han, Rong-Xun (Department of Animal Science & Biotechnology, Research Center for Transgenic Cloned Pig, Chungnam National University) ;
  • Diao, Yun-Fei (Department of Animal Science & Biotechnology, Research Center for Transgenic Cloned Pig, Chungnam National University) ;
  • Park, Chang-Sik (Department of Animal Science & Biotechnology, Research Center for Transgenic Cloned Pig, Chungnam National University) ;
  • Jin, Dong-Il (Department of Animal Science & Biotechnology, Research Center for Transgenic Cloned Pig, Chungnam National University)
  • Received : 2011.04.25
  • Accepted : 2011.06.17
  • Published : 2011.08.31
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Abstract

Reprogramming errors, which appear frequently in cloned animals, are reflected by aberrant gene expression. We previously reported the aberrant expression of TIMP-2 and PBEF in cloned placenta and differential expression of PBEF genes during pregnancy. To examine the epigenetic modifications that regulate dynamic gene expression in developing placentae, we herein analyzed the mRNA and protein expression levels of PBEF and TIMP-2 in the placentae of normal mice during pregnancy and then examined potential correlations with epigenetic modifications. DNA methylation pattern analysis revealed no difference, but ChIP assays using antibodies against H3-K9/K14 and H4-K5 histone acetylation revealed that the H3-K9/K14 acetylation levels, but not the H4-K5 acetylation levels, of the TIMP-2 and PBEF loci were significantly correlated with their gene expression levels during placentation in normal mice. These results suggest that epigenetic changes may regulate gene expression level in the developing placentae of normal mice and that inappropriate epigenetic reprogramming might be one cause of the abnormal placentae seen in cloned animals.

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References

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