Genome-wide binding analysis reveals that ANAC060 directly represses sugar-induced transcription of ABI5 in Arabidopsis.

Plant J

Laboratory of Photosynthesis and Environmental Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai, 200032, China.

Published: August 2020

AI Article Synopsis

  • The sugar levels in plants influence their growth and development, and high sugar content can inhibit seedling growth, which helps researchers study sugar-signaling pathways.
  • The study focused on the ANAC060 gene in Arabidopsis, which produces a protein that helps regulate sugar responses and can lead to sugar insensitivity when overexpressed.
  • Researchers created a DNA-binding map of ANAC060, identifying thousands of genes it interacts with, many of which are involved in stress responses, revealing that ANAC060 can both upregulate and downregulate gene expression, especially in relation to the ABI5 gene and its responses to sugar and abscisic acid.

Article Abstract

The sugar status of a plant acts as a signal affecting growth and development. The phenomenon by which high levels of sugars inhibit seedling establishment has been widely used to gain insight into sugar-signaling pathways. Natural allelic variation has been identified at the ANAC060 locus. The Arabidopsis Columbia ecotype produces a short ANAC060 protein without a transmembrane domain that is constitutively located to the nucleus, causing sugar insensitivity when overexpressed. In this study, we generated a genome-wide DNA-binding map of ANAC060 via chromatin immunoprecipitation sequencing using transgenic lines that express a functional ANAC060-GFP fusion protein in an anac060 background. A total of 3282 genes associated with ANAC060-binding sites were identified. These genes were enriched in biotic and abiotic stress responses, and the G-box binding motif was highly enriched in ANAC060-bound genomic regions. Expression microarray analysis resulted in the identification of 8350 genes whose activities were altered in the anac060 mutant and upon sugar treatment. Cluster analysis revealed that ANAC060 attenuates sugar-regulated gene expression. Direct target genes of ANAC060 included equivalent numbers of genes that were upregulated or downregulated by ANAC060. The various functions of these target genes indicate that ANAC060 has several functions. Our results demonstrate that ANAC060 directly binds to the promoter of ABI5 and represses the sugar-induced transcription of ABI5. Genetic data indicate that ABI5 is epistatic to ANAC060 in both sugar and abscisic acid responses.

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Source
http://dx.doi.org/10.1111/tpj.14777DOI Listing

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