Abstract
As reported previously, we have extensively studied FoxJ2, a member of the Fork Head transcription factors family. While the biochemical and functional structures of this transcription factor are well understood, its biological function remains unknown. Here, we present data that address this point using transgenic mouse technology. We found that the birth rate and the number of transgenic animals obtained when transferring embryos over-expressing the FoxJ2 protein were lower than those obtained with embryos over-expressing a control protein, suggesting FoxJ2 overexpression has a negative effect on embryonic development. Transient FoxJ2 transgenesis experiments have confirmed that FoxJ2 over-expression has a lethal effect on embryonic development from E10.5. Moreover, in vitro culture of FoxJ2-microinjected embryos demonstrated a significant developmental blockage, indicating that FoxJ2 could also have an effect on pre-implantation stages. Most probably, these negative effects of FoxJ2 over-expression during development also explain the low percentage of adult transgenic mice obtained. Furthermore, most of the transgenic mice that lived to adulthood did not show transgene expression. In fact, the only two adult transgenic anima...Continue Reading
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