摘要: RNA interference is now a well-recognized post-transcriptional mechanism for regulation of gene expression in both animals and plants. In this process, microRNAs (miRNAs) direct silencing complexes to complementary sequences, leading either degradation or repression translation. Plants also contain another type small RNA, interfering RNAs (siRNAs), that play role by directing cytosine methylation activities DNA sequences thus, differ from miRNAs. This nuclear system referred as RNA-directed (RdDM). plant genomes, transposable elements were initially thought be regulated alone. However, several recent reports have revealed siRNAs RdDM crucial roles transposons endogenous repeats. It becoming apparent are subjected different levels response developmental environmental cues. Transposons tightly germ cells protect the host genome transgenerational mutagenic activity. plants, activated biotic abiotic stress. The these situations has been associated with siRNA-mediated systems, suggesting plants likely evolved "multi-lock" systems transposon ensure tight control during phase changes.
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