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Nat Struct Mol Biol. 2006 Dec;13(12):1102-7. Epub 2006 Nov 26.

Evidence that microRNAs are associated with translating messenger RNAs in human cells.

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  • 1Center for RNA Molecular Biology and Department of Biochemistry, Case Western Reserve University School of Medicine, W127 10900 Euclid Avenue, Cleveland, Ohio 44106-4973, USA.


MicroRNAs (miRNAs) regulate gene expression post-transcriptionally by binding the 3' untranslated regions of target mRNAs. We examined the subcellular distribution of three miRNAs in exponentially growing HeLa cells and found that the vast majority are associated with mRNAs in polysomes. Several lines of evidence indicate that most of these mRNAs, including a known miRNA-regulated target (KRAS mRNA), are actively being translated.

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