Dynamic regulation of eve stripe 2 expression reveals transcriptional bursts in living Drosophila embryos.

Publication Year
2014

Type

Journal Article
Abstract

We present the use of recently developed live imaging methods to examine the dynamic regulation of even-skipped (eve) stripe 2 expression in the precellular Drosophila embryo. Nascent transcripts were visualized via MS2 RNA stem loops. The eve stripe 2 transgene exhibits a highly dynamic pattern of de novo transcription, beginning with a broad domain of expression during nuclear cycle 12 (nc12), and progressive refinement during nc13 and nc14. The mature stripe 2 pattern is surprisingly transient, constituting just ∼15 min of the ∼90-min period of expression. Nonetheless, this dynamic transcription profile faithfully predicts the limits of the mature stripe visualized by conventional in situ detection methods. Analysis of individual transcription foci reveals intermittent bursts of de novo transcription, with duration cycles of 4-10 min. We discuss a multistate model of transcription regulation and speculate on its role in the dynamic repression of the eve stripe 2 expression pattern during development.

Journal
Proc Natl Acad Sci U S A
Volume
111
Issue
29
Pages
10598-603
Date Published
2014 Jul 22
ISSN Number
1091-6490
Alternate Journal
Proc Natl Acad Sci U S A
PMCID
PMC4115566
PMID
24994903