Abstract
The discovery that gene expression can be silenced by exogenously introduced double-stranded RNAs into cells unveiled a hidden level of gene regulation by a variety of small RNA pathways, which are involved in regulating endogenous gene expression, defending against virus infections, and protecting the genome from invading transposons, both at the posttranscriptional and epigenetic levels. All endogenous RNA interference pathways share a conserved effector complex, which contains at least an argonaute protein and a short single-stranded RNA. Such argonaute-RNA complexes can repress the transcription of genes, target mRNA for site-specific cleavage, or block mRNA translation into proteins. This review outlines the history of RNAi discovery, function, and mechanisms of action. For comparison, it also touches on CRISPR interference.
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