N6-methyladenosine and RNA secondary structure affect transcript stability and protein abundance during systemic salt stress in Arabidopsis

Marianne C. Kramer, Kevin A. Janssen, Kyle Palos, Andrew D.L. Nelson, Lee E. Vandivier, Benjamin A. Garcia, Eric Lyons, Mark A. Beilstein, Brian D. Gregory

Research output: Contribution to journalArticle

Abstract

After transcription, a messenger RNA (mRNA) is further post-transcriptionally regulated by several features including RNA secondary structure and covalent RNA modifications (specifically N6-methyladenosine, m6A). Both RNA secondary structure and m6A have been demonstrated to regulate mRNA stability and translation and have been independently linked to plant responses to soil salinity levels. However, the effect of m6A on regulating RNA secondary structure and the combinatorial interplay between these two RNA features during salt stress response has yet to be studied. Here, we globally identify RNA-protein interactions and RNA secondary structure during systemic salt stress. This analysis reveals that RNA secondary structure changes significantly during salt stress, and that it is independent of global changes in RNA-protein interactions. Conversely, we find that m6A is anti-correlated with RNA secondary structure in a condition-dependent manner, with salt-specific m6A correlated with a decrease in mRNA secondary structure during salt stress. Taken together, we suggest that salt-specific m6A deposition and the associated loss of RNA secondary structure results in increases in mRNA stability for transcripts encoding abiotic stress response proteins and ultimately increases in protein levels from these stabilized transcripts. In total, our comprehensive analyses reveal important post-transcriptional regulatory mechanisms involved in plant long-term salt stress response and adaptation.

Original languageEnglish (US)
Article numbere00239
JournalPlant Direct
Volume4
Issue number7
DOIs
StatePublished - Jul 1 2020

Keywords

  • RNA covalent modifications
  • RNA processing
  • RNA stability
  • RNA-binding proteins
  • non-coding RNAs
  • post-transcriptional regulation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Plant Science

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