Functional dissection of the ARGONAUTE7 promoter

J. Steen Hoyer, Jose L. Pruneda-Paz, Ghislain Breton, Mariah A. Hassert, Emily E. Holcomb, Halley Fowler, Kaylyn M. Bauer, Jacob Mreen, Steve A. Kay, James C. Carrington

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

ARGONAUTES are the central effector proteins of RNA silencing which bind target transcripts in a small RNA-guided manner. Arabidopsis thaliana has 10 ARGONAUTE (AGO) genes, with specialized roles in RNA-directed DNA methylation, post-transcriptional gene silencing, and antiviral defense. To better understand specialization among AGO genes at the level of transcriptional regulation we tested a library of 1497 transcription factors for binding to the promoters of AGO1, AGO10, and AGO7 using yeast 1-hybrid assays. A ranked list of candidate DNA-binding TFs revealed binding of the AGO7 promoter by a number of proteins in two families: the miR156-regulated SPL family and the miR319-regulated TCP family, both of which have roles in developmental timing and leaf morphology. Possible functions for SPL and TCP binding are unclear: we showed that these binding sites are not required for the polar expression pattern of AGO7, nor for the function of AGO7 in leaf shape. Normal AGO7 transcription levels and function appear to depend instead on an adjacent 124-bp region. Progress in understanding the structure of this promoter may aid efforts to understand how the conserved AGO7-triggered TAS3 pathway functions in timing and polarity.

Original languageEnglish
Article numbere00102
JournalPlant Direct
Volume3
Issue number1
DOIs
StatePublished - Jan 2019

Keywords

  • Argonaute
  • leaf development
  • leaf polarity
  • post-transcriptional regulation
  • transcriptional regulation

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