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Science. 2010 Sep 10;329(5997):1306-11. doi: 10.1126/science.1191937.

Oscillating gene expression determines competence for periodic Arabidopsis root branching.

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  • 1Department of Biology and Institute for Genome Sciences and Policy Center for Systems Biology, Duke University, Durham, NC 27708, USA.

Abstract

Plants and animals produce modular developmental units in a periodic fashion. In plants, lateral roots form as repeating units along the root primary axis; however, the developmental mechanism regulating this process is unknown. We found that cyclic expression pulses of a reporter gene mark the position of future lateral roots by establishing prebranch sites and that prebranch site production and root bending are periodic. Microarray and promoter-luciferase studies revealed two sets of genes oscillating in opposite phases at the root tip. Genetic studies show that some oscillating transcriptional regulators are required for periodicity in one or both developmental processes. This molecular mechanism has characteristics that resemble molecular clock-driven activities in animal species.

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PMID:
20829477
[PubMed - indexed for MEDLINE]
PMCID:
PMC2976612
Free PMC Article
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