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Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
Published on: October 14, 2022
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DELLA-mediated gene repression is maintained by chromatin modification in rice.
Junjie Li1, Qi Li1, Wentao Wang1
1National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan, China.
The EMBO Journal
|September 11, 2023
Summary
DELLA proteins regulate plant growth by forming complexes with chromatin modifiers. This study reveals how these complexes establish silent chromatin, impacting gene expression and plant development.
Area of Science:
- Plant Biology
- Molecular Biology
- Epigenetics
Background:
- DELLA proteins are key regulators of gibberellic acid (GA) signaling.
- Increased DELLA levels in crops boosted yields during the green revolution.
- The precise molecular mechanisms of DELLA-mediated gene repression were unclear.
Purpose of the Study:
- To elucidate the molecular basis of DELLA-mediated gene repression.
- To investigate the role of chromatin regulators in GA signaling.
- To understand chromatin dynamics during GA-induced transcriptional activation.
Main Methods:
- Investigated the interaction of rice DELLA protein SLR1 with Polycomb-repressive complex 2 (PRC2) and HDA702.
- Analyzed the effect of slr1 mutation and GA signaling on chromatin complex dissociation.
- Examined histone modifications (H3K9ac, H3K27me3) and gene expression changes.
Main Results:
- SLR1 forms a tripartite complex with PRC2 and HDA702 to repress genes via silent chromatin.
- GA signaling and slr1 mutation disrupt this complex, leading to gene activation.
- Chromatin regulator function is essential for SLR1-mediated histone modification and repression.
- GA signaling involves rapid H3K9ac increase and H3K27me3 removal for transcriptional activation.
Conclusions:
- Established a general epigenetic mechanism for DELLA-mediated gene repression.
- Detailed the chromatin dynamics underlying GA signaling and transcriptional activation.
- Provides insights into DELLA protein function in plant growth and development.
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