Cell Pattern in the Arabidopsis Root Epidermis Determined by Lateral Inhibition with Feedback

Cell Pattern in the Arabidopsis Root Epidermis Determined by Lateral Inhibition with Feedback In the root epidermis of Arabidopsis, hair and nonhair cell types are specified in a distinct position-dependent pattern. Here, we show that transcriptional feedback loops between the WEREWOLF ( WER ), CAPRICE ( CPC ), and GLABRA2 ( GL2 ) genes help to establish this pattern. Positional cues bias the expression of the WER MYB gene, leading to the induction of CPC and GL2 in cells located in a particular position (N) and adoption of the nonhair fate. The truncated MYB encoded by CPC mediates a lateral inhibition mechanism to negatively regulate WER , GL2 , and its own gene in the alternative position (H) to induce the hair fate. These results provide a molecular genetic framework for understanding the determination of a cell-type pattern in plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Cell Pattern in the Arabidopsis Root Epidermis Determined by Lateral Inhibition with Feedback

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 2015 by the American Society of Plant Biologists
ISSN
1040-4651
eISSN
1532-298X
D.O.I.
10.1105/tpc.010434
Publisher site
See Article on Publisher Site

Abstract

In the root epidermis of Arabidopsis, hair and nonhair cell types are specified in a distinct position-dependent pattern. Here, we show that transcriptional feedback loops between the WEREWOLF ( WER ), CAPRICE ( CPC ), and GLABRA2 ( GL2 ) genes help to establish this pattern. Positional cues bias the expression of the WER MYB gene, leading to the induction of CPC and GL2 in cells located in a particular position (N) and adoption of the nonhair fate. The truncated MYB encoded by CPC mediates a lateral inhibition mechanism to negatively regulate WER , GL2 , and its own gene in the alternative position (H) to induce the hair fate. These results provide a molecular genetic framework for understanding the determination of a cell-type pattern in plants.

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