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Science 3 August 2001:
Vol. 293. no. 5531, pp. 880 - 883
DOI: 10.1126/science.1061320
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Reports

Reciprocal Regulation Between TOC1 and LHY/CCA1 Within the Arabidopsis Circadian Clock

David Alabadí,1* Tokitaka Oyama,1*dagger Marcelo J. Yanovsky,1* Franklin G. Harmon,1 Paloma Más,1 Steve A. Kay1ddagger

The interactive regulation between clock genes is central for oscillator function. Here, we show interactions between the Arabidopsis clock genes LATE ELONGATED HYPOCOTYL (LHY), CIRCADIAN CLOCK ASSOCIATED 1 (CCA1), and TIMING OF CAB EXPRESSION 1 (TOC1). The MYB transcription factors LHY and CCA1 negatively regulate TOC1 expression. We show that both proteins bind to a region in the TOC1 promoter that is critical for its clock regulation. Conversely, TOC1 appears to participate in the positive regulation of LHY and CCA1 expression. Our results indicate that these interactions form a loop critical for clock function in Arabidopsis.

1 Department of Cell Biology and Institute for Childhood and Neglected Diseases, The Scripps Research Institute, La Jolla, CA 92037, USA.
*   These authors contributed equally to this work.

dagger    Present address: Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.

ddagger    To whom correspondence should be addressed. E-mail: stevek{at}scripps.edu

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Plant Cell Physiol. 44, 1237-1245
   Abstract »    Full Text »    PDF »
The TIME FOR COFFEE Gene Maintains the Amplitude and Timing of Arabidopsis Circadian Clocks.
A. Hall, R. M. Bastow, S. J. Davis, S. Hanano, H. G. McWatters, V. Hibberd, M. R. Doyle, S. Sung, K. J. Halliday, R. M. Amasino, et al. (2003)
PLANT CELL 15, 2719-2729
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Arabidopsis PSEUDO-RESPONSE REGULATOR7 Is a Signaling Intermediate in Phytochrome-Regulated Seedling Deetiolation and Phasing of the Circadian Clock.
K. A. Kaczorowski and P. H. Quail (2003)
PLANT CELL 15, 2654-2665
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The Novel MYB Protein EARLY-PHYTOCHROME-RESPONSIVE1 Is a Component of a Slave Circadian Oscillator in Arabidopsis.
N. Kuno, S. G. Moller, T. Shinomura, X. Xu, N.-H. Chua, and M. Furuya (2003)
PLANT CELL 15, 2476-2488
   Abstract »    Full Text »    PDF »
Circadian Clocks in Daily and Seasonal Control of Development.
T. F. Schultz and S. A. Kay (2003)
Science 301, 326-328
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A Link between Circadian-Controlled bHLH Factors and the APRR1/TOC1 Quintet in Arabidopsis thaliana.
T. Yamashino, A. Matsushika, T. Fujimori, S. Sato, T. Kato, S. Tabata, and T. Mizuno (2003)
Plant Cell Physiol. 44, 619-629
   Abstract »    Full Text »    PDF »
A Suite of Photoreceptors Entrains the Plant Circadian Clock.
A. J. Millar (2003)
J Biol Rhythms 18, 217-226
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Enhancer Trapping Reveals Widespread Circadian Clock Transcriptional Control in Arabidopsis.
T. P. Michael and C. R. McClung (2003)
Plant Physiology 132, 629-639
   Abstract »    Full Text »    PDF »
The Circadian Clock. A Plant's Best Friend in a Spinning World.
M. E. Eriksson and A. J. Millar (2003)
Plant Physiology 132, 732-738
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Two Arabidopsis circadian oscillators can be distinguished by differential temperature sensitivity.
T. P. Michael, P. A. Salome, and C. R. McClung (2003)
PNAS 100, 6878-6883
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Rhythmic binding of a WHITE COLLAR-containing complex to the frequency promoter is inhibited by FREQUENCY.
A. C. Froehlich, J. J. Loros, and J. C. Dunlap (2003)
PNAS 100, 5914-5919
   Abstract »    Full Text »    PDF »
Circadian phase-specific degradation of the F-box protein ZTL is mediated by the proteasome.
W.-Y. Kim, R. Geng, and D. E. Somers (2003)
PNAS 100, 4933-4938
   Abstract »    Full Text »    PDF »


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