In vitro and in vivo derived porcine embryos possess similar, but not identical, patterns of Oct4, Nanog, and Sox2 mRNA expression during cleavage development

Molecular Reproduction and Development
Luca Magnani, Ryan A Cabot

Abstract

In vitro culture conditions stress the cleavage stage mammalian embryo and can contribute to reduced developmental potential of cultured embryos. One process that may be altered during embryo culture is the establishment and maintenance of pluripotency. Pluripotency is largely controlled by three genes: Oct4, Nanog, and Sox2. The objective of this study was to determine the expression pattern of Oct4, Nanog, and Sox2 in cleavage stage porcine embryos obtained in vivo or by in vitro fertilization and parthenogenetic activation. We used quantitative, real time PCR to assess the relative amount of each transcript in cleavage stage embryos. We found that Oct4 was transiently activated at the 2-cell stage (P-value <0.05) while Nanog and Sox2 were activated at the 4-cell stage (P-value <0.05) in in vitro embryos. Embryos derived in vivo showed a similar but not identical pattern of expression of Nanog mRNA been in highest abundance both at the 4 cell and the blastocyst stage. The activation observed at the 4-cell stage for Nanog and Sox2 was shown to be RNA polymerase II dependent (P-value <0.05). This study showed that Oct4, Nanog, and Sox2 possess similar, but not identical, patterns of expression between in vitro and in vivo deriv...Continue Reading

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