Among the three main categories of small silencing RNAs in insects and mammals-siRNAs, miRNAs, and piRNAs-siRNAs were thought to arise primarily from exogenous sources, whereas miRNAs and piRNAs arise from endogenous loci. Recent work in flies and mice reveals several classes of endogenous siRNAs (endo-siRNAs) that contribute to functions previously reserved for miRNAs and piRNAs, including gene regulation and transposon suppression.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2675693 | PMC |
http://dx.doi.org/10.1016/j.molcel.2008.07.008 | DOI Listing |
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