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Title: Spatiotemporal analysis identifies ABF2 and ABF3 as key hubs of endodermal response to nitrate

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [6]; ORCiD logo [3]
  1. Fondo de Desarrollo de Areas Prioritarias, Santiago (Chile); Pontificia Universidad Católica de Chile, Santiago (Chile)
  2. Millennium Institute for Integrative Biology, Santiago (Chile); Universidad Mayor, Santiago (Chile)
  3. Fondo de Desarrollo de Areas Prioritarias, Santiago (Chile); Pontificia Universidad Católica de Chile, Santiago (Chile); Millennium Institute for Integrative Biology, Santiago (Chile)
  4. University of Delaware, Newark, DE (United States)
  5. Universidad Politécnica de Madrid (Spain)
  6. New York University (NYU), NY (United States)
  7. Duke University, Durham, NC (United States)

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.

Research Organization:
New York University (NYU), NY (United States)
Sponsoring Organization:
ANID Fondo de Desarrollo de Areas Prioritarias; ANID–Millennium Science Initiative Program; Agencia Nacional de Investigación y Desarrollo (ANID) National Fund for Scientific and Technological Development; Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)-MPG; HHMI and NIH Maximizing Investigator’s Research; NIH National Institute of General Medical Sciences; National Institute for Agriculture and Food Research and Technology; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0014377
OSTI ID:
2480611
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 4 Vol. 119; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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