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A Maize Gene Regulatory Network For Phenolic Metabolism

, : A Maize Gene Regulatory Network For Phenolic Metabolism. Molecular Plant (): -

NlmCategory="UNASSIGNED">The translation of the genotype into phenotype, represented for example by the expression of genes encoding enzymes required for the biosynthesis of phytochemicals important in the interaction of plants with the environment, is carried out by transcription factors (TFs) that recognize specific cis-regulatory elements in the genes that they control. TFs and their target genes are organized in gene regulatory networks (GRNs), and uncovering GRN architecture presents an important biological challenge necessary to explain gene regulation. Linking TFs to the genes they control, central to understanding GRNs, can be carried out using gene- or TF-centered approaches. We used a gene-centered approach consisting of yeast one-hybrid studies to render a network of protein-DNA interactions that participate in the transcriptional control of genes involved in the biosynthesis of maize phenolic compounds that include general phenylpropanoids, lignins and flavonoids. We identified 1,100 protein-DNA interactions involving 54 phenolic gene promoters and 568 TFs. A set of 11 TFs recognized ten or more promoters, suggesting a role in coordinating pathway gene expression. The integration of the gene-centered network with information derived from TF-centered approaches provides a foundation for a phenolics GRN characterized by interlaced feed-forward loops that link developmental regulators with biosynthetic genes.


PMID: 27871810

DOI: 10.1016/j.molp.2016.10.020

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