| definition |
A class of microRNAs that regulate developmental timing. The RNA transcript of the miRNA genes prior to processing to pre-miRNA. Precursors to miRNA generated from pri-miRNA. They are exported from the nucleus where they are further processed by Dicer RNase to generate mature miRNA. Small double-stranded, non-protein coding RNAs, 21-25 nucleotides in length generated from single-stranded microRNA gene transcripts by the same RIBONUCLEASE III, Dicer, that produces small interfering RNAs (RNA, SMALL INTERFERING). They become part of the RNA-INDUCED SILENCING COMPLEX and repress the translation (TRANSLATION, GENETIC) of target RNA by binding to homologous 3'UTR region as an imperfect match. The small temporal RNAs (stRNAs), let-7 and lin-4, from C. elegans, are the first 2 miRNAs discovered, and are from a class of miRNAs involved in developmental timing.
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