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Recent work has raised the possibility that chromatin modifications pre-set embryonic patterns of gene expression. In this issue of Developmental Cell, Lindeman et al. (2011) support this observation and describe how the pattern of several chromatin marks evolves over the transition from maternal to zygotic control of development.
An emerging concept in development is that transcriptional poising presets patterns of gene expression in a manner that reflects a cell's developmental potential. However, it is not known how certain loci are specified in the embryo to establish poised chromatin architecture as the developmental program unfolds. We find that, in the context of transcriptional quiescence prior to the midblastula transition...
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