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Recent evidence indicates the presence of alternative pathways for microRNA (miRNA) and short hairpin (shRNA) processing. Specifically, some of these molecules are refractory to Dicer-mediated processing, which allows alternative processing routes via the Ago2 endonuclease. The resulting RNA molecules differ in size and sequence and will thus trigger the silencing of different target RNAs. It is, therefore, important to understand these processing routes in mechanistic detail such that one can design exclusive RNA reagents for a specific processing route. The exact sh/miRNA properties that determine this routing toward Dicer or Ago2 are incompletely understood. The size of the base-paired stem seems an important determinant, but other RNA elements may contribute as well. In this study, we document the importance of a weak G-U or U-G base pair at the top of the hairpin stem.

Probing the shRNA characteristics that hinder Dicer recognition and consequently allow Ago-mediated processing and AgoshRNA activity