Abstract
MicroRNAs (miRNAs) are generated from stem-loop-structured double-stranded RNA precursors by the consecutive action of the two RNase III-type endoribonuclease Drosha and Dicer. However, such structures are very common on cellular transcripts and specific features have evolved that guide and regulate processing of stem-loop-structured hairpins into mature and functional miRNAs. These features include sequence motifs and local RNA structures but also trans-acting factors such as RNA binding proteins. The menu of features required for miRNA biogenesis is summarized in this review.
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