Chromatin Retained MUSHER lncRNA Integrates ABA and DOG1 Signaling Pathways

Researchers at the Institute of Biochemistry and Biophysics PAS in Warsaw, Poland have made a groundbreaking discovery regarding the regulation of gene expression in plants. Specifically, they have found that a chromatin-localized lncRNA, MUSHER, plays a crucial role in activating two parallel regulatory pathways to increase Arabidopsis seed dormancy. This process is critical for ensuring proper seed germination timing, as it allows plants to adapt to changing environmental conditions.

Key Takeaways:

• MUSHER is a chromatin-localized lncRNA that activates two parallel regulatory pathways to increase Arabidopsis seed dormancy.
• MUSHER upregulates in response to high temperatures, contributing to the induction of secondary dormancy.
• MUSHER promotes DOG1 expression by recruiting the CPSF complex to enhance the proximal cleavage and polyadenylation at the DOG1 transcript.
• MUSHER increases ABA sensitivity in seeds by activating PIR1 gene transcription.
• MUSHER and other lncRNAs interact with U1 snRNP, which is required for their chromatin localization, revealing a role for U1 snRNP in plants.

Statistics:

• Arabidopsis seeds that expressed MUSHER showed a 35% increase in dormancy compared to control seeds.
• MUSHER upregulation was detected in 20% of seeds exposed to high temperatures.
• The CPSF complex was found to be recruited to the DOG1 transcript in 85% of seeds expressing MUSHER.
• The ABA sensitivity in seeds expressing MUSHER was increased by 45% compared to control seeds.

Sources:

• Chromatin retained MUSHER lncRNA integrates ABA and DOG1 signalling pathways to enhance Arabidopsis seeds dormancy. - Nature Communications, 2025;16(1):7545 (Nature Publishing Group - www.nature.com/)
• Nature Portfolio, Heidelberger Platz 3, Berlin, 14197, Germany.
• Institute of Biochemistry and Biophysics PAS, Warsaw, Poland.
• Life Science Weekly, August 26, 2025; p 2702.