A post-transcriptional mechanism of gene-regulation/silencing mediated by small RNAs (siRNA)

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Why introduction of an extra copy of a gene related to pigmentation causes RNA interference in Petunia?

RNAi became famous after Fire and Mello experiment in C.elegans; however, it had been observed before. In the 80's, Jorgensen was trying to increase pigmentation of Petunia flowers by introducing ...
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Can encoding of miRNAs in introns not cause dysregulation of gene expression?

For example, consider a gene X which has an intron which encodes a miRNA that downregulates expression of another gene Y. When the gene X is translated, this miRNA will appear as a byproduct of ...