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Poised RNA polymerase II changes over developmental time and prepares genes for future expression
Bjoern Gaertner1, Jeff Johnston, Kai Chen
1Stowers Institute for Medical Research, Kansas City, MO 64110, USA.
Cell Reports
|December 25, 2012
Summary
Poised RNA polymerase II (Pol II) is recruited de novo during development, enabling gene expression. This recruitment is temporally regulated and tissue-specifically repressed, suggesting a framework for predicting developmental programs.
Area of Science:
- Developmental biology
- Gene regulation
- Chromatin biology
Background:
- Poised RNA polymerase II (Pol II) at developmental genes facilitates rapid gene induction.
- Mechanisms regulating poised Pol II recruitment during development remain unclear.
Purpose of the Study:
- To investigate the regulation of poised Pol II recruitment during embryonic development.
- To understand how poised Pol II contributes to developmental gene expression programs.
Main Methods:
- Isolation of muscle tissue from Drosophila embryos across five differentiation stages.
- Analysis of gene recruitment patterns and chromatin states.
Main Results:
- Poised Pol II is recruited de novo to many genes during differentiation, conferring future expression permissiveness.
- These changes are stage-specific rather than tissue-specific.
- Polycomb group repression is tissue-specific, and its interplay with Pol II defines genes with dynamic expression.
Conclusions:
- Poised Pol II is temporally regulated and subject to tissue-specific repression.
- A framework for predicting developmental programs based on chromatin state can be established.
- Findings offer insights into developmental gene regulation and chromatin dynamics.
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