The Arabidopsis homolog of trithorax, ATX1, binds phosphatidylinositol 5-phosphate, and the two regulate a common set of target genes

Raul Alvarez-Venegas, Monther Sadder, Andrej Hlavacka, František Baluška, Yuannan Xia, Guoqing Lu, Alexey Firsov, Gautam Sarath, Hideaki Moriyama, Joseph G. Dubrovsky, Zoya Avramova

Research output: Contribution to journalArticle

109 Scopus citations


The Arabidopsis homolog of trithorax, ATX1, regulates numerous functions in Arabidopsis beyond the homeotic genes. Here, we identified genome-wide targets of ATX1 and showed that ATX1 is a receptor for a lipid messenger, phosphatidylinositol 5-phosphate, PI5P. PI5P negatively affects ATX1 activity, suggesting a regulatory pathway connecting lipid-signaling with nuclear functions. We propose a model to illustrate how plants may respond to stimuli (external or internal) that elevate cellular PI5P levels by altering expression of ATX1-controlled genes.

Original languageEnglish (US)
Pages (from-to)6049-6054
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number15
StatePublished - Apr 11 2006



  • Epigenetic regulation
  • Lipid signaling

ASJC Scopus subject areas

  • General

Cite this