Inference of the Arabidopsis Lateral Root Gene Regulatory Network Suggests a Bifurcation Mechanism That Defines Primordia Flanking and Central Zones

Julien Lavenus, Tatsuaki Goh, Soazig Guyomarc'h, Kristine Hill, Mikael Lucas, Ute Voss, Kim Kenobi, Michael Wilson, Etienne Farcot, Gretchen Hagen, Thomas Guilfoyle, Hidehiro Fukaki, Laurent Laplaze, Malcolm Bennett

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Abstract

A large number of genes involved in lateral root (LR) organogenesis have been identified over the last decade using forward and reverse genetic approaches in Arabidopsis thaliana. Nevertheless, how these genes interact to form a LR regulatory network largely remains to be elucidated. In this study, we developed a time-delay correlation algorithm (TDCor) to infer the gene regulatory network (GRN) controlling LR primordium initiation and patterning in Arabidopsis from a time-series transcriptomic data set. The predicted network topology links the very early-activated genes involved in LR initiation to later expressed cell identity markers through a multistep genetic cascade exhibiting both positive and negative feedback loops. The predictions were tested for the key transcriptional regulator AUXIN RESPONSE FACTOR7 node, and over 70% of its targets were validated experimentally. Intriguingly, the predicted GRN revealed a mutual inhibition between the ARF7 and ARF5 modules that would control an early bifurcation between two cell fates. Analyses of the expression pattern of ARF7 and ARF5 targets suggest that this patterning mechanism controls flanking and central zone specification in Arabidopsis LR primordia.
Original languageEnglish
Pages (from-to)1368-1388
Number of pages21
JournalPlant Cell
Volume27
Issue number5
DOIs
Publication statusPublished - 05 May 2015

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