In a breakthrough for plant epitranscriptomics, researchers report that Arabidopsis thaliana uses N1-methyladenosine (m1A) to modulate mRNA behavior with base-level precision. m1A is a relatively newly recognized mRNA methylation mark, and until now its distribution and biological impact in plants had remained largely unexplored.
Using base-resolution m1A methylome profiling across diverse Arabidopsis tissues, the team maps where the modification accumulates and links those patterns to gene activity. The study finds m1A is enriched in the 5′ untranslated region (5′ UTR), a location known to influence transcript fate by shaping how mRNAs engage with translation machinery.
The authors also show that m1A preferentially marks highly expressed genes, suggesting the modification participates in sustaining or tuning transcriptional output. Crucially, m1A abundance negatively correlates with mRNA translation, pointing to a role in slowing or reprogramming protein synthesis during specific cellular states.
At the biochemical level, the paper identifies the writers of the modification. TRM6 and TRM61 assemble as an m1A methyltransferase complex, and the work further implicates ATH3 as a regulatory partner that affects m1A levels. Together, these components provide a mechanistic route from molecular enzymology to the epitranscriptomic landscape.
Beyond writers, the study highlights the existence of previously unknown m1A readers in plants, including CP33B and ECT2. By proposing how these proteins recognize methylated adenosines, the work helps explain how the same chemical tag can produce distinct regulatory outcomes.
To assess function in vivo, the researchers connect m1A dynamics to stress signaling. They demonstrate that m1A is intricately involved in abscisic acid (ABA) signalling, a central hormone pathway that orchestrates drought and stress responses in plants.
Genetic analyses strengthen the causal link: knockout or knockdown of key m1A-related genes results in ABA hypersensitivity. In other words, altering m1A methylation machinery makes plants overreact to ABA cues, indicating that m1A normally helps calibrate hormone-driven gene regulation.
Overall, the findings establish m1A as a dynamic epitranscriptomic mark in Arabidopsis, with a clear connection to translation control and ABA-mediated adaptation. The work positions m1A alongside other RNA modifications as a versatile layer of regulation, potentially expanding strategies for improving plant stress resilience.
Subject of Research: N1-methyladenosine (m1A) mRNA methylation in Arabidopsis and its role in ABA signalling
Article Title: N1-methyladenosine mRNA methylation in Arabidopsis
Article References:
Ke, Y., Huang, H., Hou, ZY. et al. N-methyladenosine mRNA methylation in Arabidopsis. Nat. Plants (2026). https://doi.org/10.1038/s41477-026-02343-3
Image Credits: AI Generated
DOI: https://doi.org/10.1038/s41477-026-02343-3
Keywords: m1A, N1-methyladenosine, mRNA methylation, 5′ UTR, TRM6, TRM61, ATH3, CP33B, ECT2, ABA signalling, translation regulation
