Methylthioadenosine-driven rewiring of sulfur assimilation lowers the methyl index and fertility in Arabidopsis.

MTA overaccumulation in Arabidopsis reproductive tissues reduces the methyl index and impairs development by disrupting sulfur metabolism and DNA methylation.

• Why it matters: Understanding how sulfur metabolism influences plant growth and fertility is crucial for improving crop resilience and reproductive success, especially under nutrient stress conditions.
• What they did: Researchers decreased MTA recycling in Arabidopsis, analyzing developmental, metabolic, and regulatory effects through metabolite profiling, RNA-seq, and bisulfite sequencing, focusing on MTA's role in sulfur utilization and methylation.
• The result: Findings reveal that MTA overaccumulation lowers cysteine, methionine, and SAM levels, alters energy and cell cycle regulation, and causes global changes in DNA methylation, ultimately affecting plant development and fertility.