Optimal compositions of potent sliced-siRNA with DNA bases substitution and insights of Ago2 slicing actions

DNA-nt substituted sliced-siRNA (sliDRNAs) show distinct nucleotide composition from siRNA with DNA nts (siDRNA) and reveal Ago2 slicing and maturation effects on sliRNA potency.

• Why it matters: To enable in vivo use of potent miRNA-451–biogenesis–based sliRNAs, the study addresses how DNA substitutions alter processing, maturation, and silencing mechanisms.
• What they did: The authors substituted RNA nucleotides in sliRNA with DNA nucleotides to create sliDRNAs, then compared their processing/maturation and silencing behavior with siDRNA, alongside analyses of Ago2 slicing and trimming/tailing.
• The result: sliDRNAs indicate additional, different silencing mechanisms versus siDRNA and show that trimming and tailing during sliRNA maturation affect potency, supporting future chemically modified nucleotide designs for improved in vivo stability and transportability.

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