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An Oct4-Sall4-Nanog network controls developmental progression in the pre-implantation mouse embryo. | LitMetric

AI Article Synopsis

  • - The study investigates the regulatory network of pre-implantation development in mouse embryos by using gene knockdown techniques on important embryonic stem cell factors, followed by extensive analysis of gene expression.
  • - Key transcription factors Oct4, Sall4, and Nanog were found to regulate metabolism- and transport-related genes specifically in embryos, which are not controlled in embryonic stem cells.
  • - Results showed that gene knockdowns led to developmental arrests in embryos, with the DNA methyltransferase Dnmt3b playing a crucial role in embryo development and forming a protective network with pluripotency factors against gene expression variability.

Article Abstract

Landmark events occur in a coordinated manner during pre-implantation development of the mammalian embryo, yet the regulatory network that orchestrates these events remains largely unknown. Here, we present the first systematic investigation of the network in pre-implantation mouse embryos using morpholino-mediated gene knockdowns of key embryonic stem cell (ESC) factors followed by detailed transcriptome analysis of pooled embryos, single embryos, and individual blastomeres. We delineated the regulons of Oct4, Sall4, and Nanog and identified a set of metabolism- and transport-related genes that were controlled by these transcription factors in embryos but not in ESCs. Strikingly, the knockdown embryos arrested at a range of developmental stages. We provided evidence that the DNA methyltransferase Dnmt3b has a role in determining the extent to which a knockdown embryo can develop. We further showed that the feed-forward loop comprising Dnmt3b, the pluripotency factors, and the miR-290-295 cluster exemplifies a network motif that buffers embryos against gene expression noise. Our findings indicate that Oct4, Sall4, and Nanog form a robust and integrated network to govern mammalian pre-implantation development.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564263PMC
http://dx.doi.org/10.1038/msb.2012.65DOI Listing

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