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MicroRNAs (miRNAs) are small non-coding RNAs (ncRNAs) that are involved in post-transcriptional gene regulation. It has long been assumed that miRNAs exert their roles only in the cytoplasm, where they recognize their target protein-coding messenger RNAs (mRNAs), and result in translational repression or target mRNA degradation. Recent studies, however, have revealed that mature miRNAs can also be...
It has long been assumed that miRNAs can only target protein-coding mRNAs in the cytoplasm. Recent studies, however, reveal miRNAs are also transported from the cytoplasm to the nucleus, where they function in a noncanonical manner to regulate noncoding RNAs. Here, we highlight the working model of these noncanonical miRNAs.
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