Spatiotemporal analysis identifies ABF2 and ABF3 as key hubs of endodermal response to nitrate.
Proc Natl Acad Sci U S A
; 119(4)2022 01 25.
Article
em En
| MEDLINE
| ID: mdl-35046022
ABSTRACT
Nitrate is a nutrient and a potent signal that impacts global gene expression in plants. However, the regulatory factors controlling temporal and cell type-specific nitrate responses remain largely unknown. We assayed nitrate-responsive transcriptome changes in five major root cell types of the Arabidopsis thaliana root as a function of time. We found that gene-expression response to nitrate is dynamic and highly localized and predicted cell type-specific transcription factor (TF)-target interactions. Among cell types, the endodermis stands out as having the largest and most connected nitrate-regulatory gene network. ABF2 and ABF3 are major hubs for transcriptional responses in the endodermis cell layer. We experimentally validated TF-target interactions for ABF2 and ABF3 by chromatin immunoprecipitation followed by sequencing and a cell-based system to detect TF regulation genome-wide. Validated targets of ABF2 and ABF3 account for more than 50% of the nitrate-responsive transcriptome in the endodermis. Moreover, ABF2 and ABF3 are involved in nitrate-induced lateral root growth. Our approach offers an unprecedented spatiotemporal resolution of the root response to nitrate and identifies important components of cell-specific gene regulatory networks.
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MEDLINE
Assunto principal:
Fatores de Transcrição
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Fenômenos Fisiológicos Vegetais
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Regulação da Expressão Gênica de Plantas
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Proteínas de Arabidopsis
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Proteínas de Ligação a DNA
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Fatores de Transcrição de Zíper de Leucina Básica
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Nitratos
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article