Chromatin remodeling in bovine embryos indicates species-specific regulation of genome activation

Michelle M. Halstead, Xin Ma, Chuan Zhou, Richard M. Schultz and Pablo J. Ross ()
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Michelle M. Halstead: University of California
Xin Ma: University of California
Chuan Zhou: University of California
Richard M. Schultz: University of California
Pablo J. Ross: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-16

Abstract: Abstract The shift from maternal to embryonic control is a critical developmental milestone in preimplantation development. Widespread transcriptomic and epigenetic remodeling facilitate this transition from terminally differentiated gametes to totipotent blastomeres, but the identity of transcription factors (TF) and genomic elements regulating embryonic genome activation (EGA) are poorly defined. The timing of EGA is species-specific, e.g., the timing of murine and human EGA differ significantly. To deepen our understanding of mammalian EGA, here we profile changes in open chromatin during bovine preimplantation development. Before EGA, open chromatin is enriched for maternal TF binding, similar to that observed in humans and mice. During EGA, homeobox factor binding becomes more prevalent and requires embryonic transcription. A cross-species comparison of open chromatin during preimplantation development reveals strong similarity in the regulatory circuitry underlying bovine and human EGA compared to mouse. Moreover, TFs associated with murine EGA are not enriched in cattle or humans, indicating that cattle may be a more informative model for human preimplantation development than mice.

Date: 2020
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DOI: 10.1038/s41467-020-18508-3

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