Biogenesis, features, and functions of coding transcripts-derived siRNAs in plants.
Yan Y, Liu Y, Guo H
Plant Signaling
Understanding how plants naturally defend themselves at the molecular level could lead to crops that are more resilient to drought, disease, and pests — meaning more reliable harvests and less need for chemical pesticides in the food you eat.
Inside every plant cell, there is a quality-control system that checks genetic instructions (called mRNAs) for errors. When a plant is under stress — attacked by a pathogen, for example — this system can convert damaged or faulty instructions into tiny molecular signals that silence problem genes and ramp up the plant's defenses. Scientists are now mapping exactly how this process works, which loci are most active, and how the signals spread and amplify, opening the door to engineering tougher crops.
Key Findings
Coding transcript-derived siRNAs (ct-siRNAs) are produced when normal RNA quality-control pathways are disrupted by stress or genetic impairment, linking mRNA surveillance directly to gene silencing.
22-nucleotide ct-siRNA species are especially potent triggers of secondary siRNA amplification, creating a cascading silencing response that can broadly reshape gene expression networks.
ct-siRNA production is non-random, concentrating at specific genomic 'hotspot' loci whose transcripts share distinctive RNA structural features and translational status, suggesting a selective and regulated mechanism.
chevron_right Technical Summary
Plants have a molecular alarm system that kicks in when their cells are stressed or damaged, converting faulty genetic messages into silencing signals that shut down harmful genes and boost defenses. This review explains how these signals are made, what controls them, and how they help plants fight disease and environmental stress.
Abstract Preview
Plant small RNAs (sRNAs) are pivotal regulators of development, genome stability, and environmental adaptation. In plants, endogenous sRNAs are broadly grouped into microRNAs (miRNAs) and small int...
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