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Updated: May 31, 2026

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06:16

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Dehydration-induced condensation of AGO1 modulates miRNA functionality

Hyun Ju Jung1, Tae Rin Oh2, Woorim Yang1

  • 1Department of Systems Biology, Institute of Life Science and Biotechnology, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.

The Plant Cell
|May 29, 2026
PubMed

Insights

Plant dehydration tolerance is enhanced by ARGENTAUTE 1 (AGO1) protein phase separation, which temporarily reduces energy-intensive microRNA (miRNA) regulation during drought stress.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are crucial for plant responses to environmental stresses like water deficiency.
  • The ARGENTAUTE 1 (AGO1) protein is a key component of the miRNA-induced silencing complex, mediating mRNA cleavage or translational repression.

Purpose of the Study:

  • To investigate the role of the ARGENTAUTE 1 (AGO1) protein's prion-like domain in plant responses to dehydration.
  • To elucidate the mechanism by which AGO1 functions under water-deficient conditions in Arabidopsis thaliana.

Main Methods:

  • Analysis of AGO1 protein behavior under dehydration stress in Arabidopsis thaliana.
  • Investigating the phenomenon of liquid-liquid phase separation (LLPS) in AGO1.
  • Assessing the impact of AGO1 condensation on miRNA regulatory activity and plant dehydration tolerance.

Main Results:

  • The prion-like domain of AGO1 facilitates topological changes and liquid-liquid phase separation (LLPS) under dehydration.
  • Dehydration-induced AGO1 condensation modulates its activity and enhances plant dehydration tolerance.
  • AGO1 condensation is reversible upon rehydration, restoring normal protein levels and miRNA regulation.

Conclusions:

  • AGO1 phase separation is an emergent property that helps plants cope with dehydration by attenuating energy-consuming miRNA pathways.
  • This mechanism provides a novel insight into plant stress tolerance at the molecular level.

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