RdDM-Associated Chromatin Remodelers in Soybean: Evolution and Stress-Induced Expression of CLASSY Genes

Area of Science:

• Epigenetics and Molecular Biology
• Plant Genomics
• Evolutionary Biology

Background:

• RNA-directed DNA methylation (RdDM) is a key epigenetic mechanism in plants, involving chromatin remodeling proteins like CLASSY (CLSY).
• The CLSY gene family's role in soybean, a vital crop, is not well understood.
• Previous research identified CLSY proteins primarily in Arabidopsis thaliana.

Purpose of the Study:

• To identify novel CLSY family members in soybean using profile hidden Markov models (profile HMMs).
• To investigate the phylogenetic relationships of CLSY genes across diverse plant lineages.
• To explore the expression patterns of CLSY genes in soybean under abiotic stress conditions.

Main Methods:

• Utilized profile HMMs for CLSY gene identification in soybean and other plant species.
• Conducted phylogenetic analyses to understand CLSY gene evolution.
• Employed RT-qPCR to assess gene expression under salt and osmotic stress during germination.

Main Results:

• Identified two new soybean CLSY1-2 candidates and one DRD1 candidate.
• Detected CLSY and DRD1 genes in Aquilegia coerulea for the first time.
• Phylogenetic analysis revealed two major CLSY groups, with soybean family expansion linked to gene duplication events.
• CLSY and other epigenetic regulators exhibited stress-modulated expression in soybean seedlings.

Conclusions:

• Enhances understanding of CLSY family evolution and expansion mechanisms in plants, particularly soybean.
• Provides novel insights into the role of CLSY genes in soybean's response to abiotic stress.
• Highlights the importance of epigenetic regulation in crop adaptation to environmental challenges.