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Reciprocal Regulation Between TOC1 and LHY / CCA1 Within the Arabidopsis Circadian Clock
Mutual control between TOC1 and LHY/CCA1 proteins in the internal clock of Arabidopsis plants
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Abstract
Interactions between three Arabidopsis clock genes are critical for oscillator function.
- LATE ELONGATED HYPOCOTYL (LHY) and CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) negatively regulate the expression of TIMING OF CAB EXPRESSION 1 (TOC1).
- LHY and CCA1 bind to a specific region in the TOC1 promoter that is important for its regulation by the circadian clock.
- TOC1 may positively regulate the expression of LHY and CCA1.
- These interactions create a feedback loop that is essential for maintaining the circadian clock in Arabidopsis.
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