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Author Li J., Qiu J.X., Zeng Q.H., Yi Zhuang, Zhang N., Xu S.X., Jin J., Dong Z.C., Chen L., Huang W.
Title OsTOC1 plays dual roles in the regulation of plant circadian clock by functioning as a direct transcription activator or repressor.
Abstract:
Plant clock function relies on precise timing of gene expression through complex regulatory networks consisting of activators and repressors at the core of oscillators. Although TIMING OF CAB EXPRESSION 1 (TOC1) has been recognized as a repressor involved in shaping oscillations and regulating clock-driven processes, its potential to directly activate gene expression remains unclear. In this study, we find that OsTOC1 primarily acts as a transcriptional repressor for core clock components, including OsLHY and OsGI. Here, we show that OsTOC1 possesses the ability to directly activate the expression of circadian target genes. Through binding to the promoters of OsTGAL3a/b, transient activation of OsTOC1 induces the expression of OsTGAL3a/b, indicating its role as an activator contributing to pathogen resistance. Moreover, TOC1 participates in regulating multiple yield-related traits in rice. These findings suggest that TOC1's function as a transcriptional repressor is not inherent, providing flexibility to circadian regulations, particularly in outputs.
Journal Cell Rep
Country China
Volume 42(7)
Pages 112765
Year 2023
PubMed ID 37421622
PubMed Central ID -
DOI 10.1016/j.celrep.2023.112765
URL -
Relation
Gene BBX10 BBX12 BBX25 CCA1 COL4 GI HD2 IAA12 IAA27 PRR59 PRR73 PRR95 TGAL3A TGAL3B TOC1
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain 		-
Stages in Each Organ
- Muant Lines (Gene) 		-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
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