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| Overlapping and distinct roles of PRR7 and PRR9 in the Arabidopsis circadian clock |
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| Author(s): Farre EM, Harmer SL, Harmon FG, Yanovsky MJ, Kay SA |
| Source: CURRENT BIOLOGY Volume: 15 Issue: 1 Pages: 47-54 Published: JAN 11 2005 |
| Times Cited: 60 References: 38 |
| Abstract: The core mechanism of the circadian oscillators described to date rely on transcriptional negative feedback loops with a delay between the negative and the positive components [1-3]. In plants, the first suggested regulatory loop involves the transcription factors CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY) and the pseudo-response regulator TIMING OF CAB EXPRESSION 1 (TOC1/PRR1)[4]. TOC1 is a member of the Arabidopsis circadian-regulated PRR gene family [5,6]. Analysis of single and double mutants in PRR7 and PRR9 indicates that these morning-expressed genes play a dual role in the circadian clock, being involved in the transmission of light signals to the clock and in the regulation of the central oscillator. Furthermore, CCA1 and LHY had a positive effect on PRR7 and PRR9 expression levels, indicating that they might form part of an additional regulatory feedback loop. We propose that the Arabidopsis circadian oscillator is composed of several interlocking positive and negative feedback loops, a feature of clock regulation that appears broadly conserved between plants, fungi, and animals. |
| Document Type: Article |
| Language: English |
| Reprint Address: Kay, SA (reprint author), Scripps Res Inst, Dept Cell Biol, 10550 N Torrey Pines Rd, La Jolla, CA 92037 USA |
Addresses:
1. Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA
2. Univ Calif Davis, Plant Biol Sect, Davis, CA 95616 USA |
| Publisher: CELL PRESS, 1100 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138 USA |
| Subject Category: Biochemistry & Molecular Biology |
| IDS Number: 893JL |
| ISSN: 0960-9822 |
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