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A global change in RNA polymerase II pausing during the Drosophila midblastula transition.

Research paper by Kai K Chen, Jeff J Johnston, Wanqing W Shao, Samuel S Meier, Cynthia C Staber, Julia J Zeitlinger

Indexed on: 21 Aug '13Published on: 21 Aug '13Published in: eLife



Abstract

Massive zygotic transcription begins in many organisms during the midblastula transition when the cell cycle of the dividing egg slows down. A few genes are transcribed before this stage but how this differential activation is accomplished is still an open question. We have performed ChIP-seq experiments on tightly staged Drosophila embryos and show that massive recruitment of RNA polymerase II (Pol II) with widespread pausing occurs de novo during the midblastula transition. However, ∼100 genes are strongly occupied by Pol II before this timepoint and most of them do not show Pol II pausing, consistent with a requirement for rapid transcription during the fast nuclear cycles. This global change in Pol II pausing correlates with distinct core promoter elements and associates a TATA-enriched promoter with the rapid early transcription. This suggests that promoters are differentially used during the zygotic genome activation, presumably because they have distinct dynamic properties. DOI:http://dx.doi.org/10.7554/eLife.00861.001.