| Correct biological timing in Arabidopsis requires multiple light-signaling pathways. | |
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MedLine Citation:
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PMID: 20615944 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Circadian oscillators provide rhythmic temporal cues for a range of biological processes in plants and animals, enabling anticipation of the day/night cycle and enhancing fitness-associated traits. We have used engineering models to understand the control principles of a plant's response to seasonal variation. We show that the seasonal changes in the timing of circadian outputs require light regulation via feed-forward loops, combining rapid light-signaling pathways with entrained circadian oscillators. Linear time-invariant models of circadian rhythms were computed for 3,503 circadian-regulated genes and for the concentration of cytosolic-free calcium to quantify the magnitude and timing of regulation by circadian oscillators and light-signaling pathways. Bioinformatic and experimental analysis show that rapid light-induced regulation of circadian outputs is associated with seasonal rephasing of the output rhythm. We identify that external coincidence is required for rephasing of multiple output rhythms, and is therefore important in general phase control in addition to specific photoperiod-dependent processes such as flowering and hypocotyl elongation. Our findings uncover a fundamental design principle of circadian regulation, and identify the importance of rapid light-signaling pathways in temporal control. |
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Authors:
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Neil Dalchau; Katharine E Hubbard; Fiona C Robertson; Carlos T Hotta; Helen M Briggs; Guy-Bart Stan; Jorge M Gonçalves; Alex A R Webb |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-01 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 107 ISSN: 1091-6490 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-07-21 Completed Date: 2010-09-01 Revised Date: 2010-09-28 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 13171-6 Citation Subset: IM |
Affiliation:
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Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arabidopsis
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genetics,
metabolism*,
radiation effects* Arabidopsis Proteins / metabolism Circadian Rhythm / radiation effects* Gene Expression Regulation, Plant / radiation effects Light* Light Signal Transduction* / radiation effects Light-Harvesting Protein Complexes / metabolism Models, Biological RNA, Messenger / genetics, metabolism Reproducibility of Results |
| Grant Support | |
ID/Acronym/Agency:
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//Biotechnology and Biological Sciences Research Council |
| Chemical | |
Reg. No./Substance:
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0/Arabidopsis Proteins; 0/CAB2 protein, Arabidopsis; 0/Light-Harvesting Protein Complexes; 0/RNA, Messenger |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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