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In Drosophila, long-term effects of RNA interference (RNAi) must be achieved by integrating into the genome a template from which an RNAi trigger is transcribed by cellular RNA polymerases, generally RNA polymerase II or III. With encoded triggers, not only can essentially permanent silencing be achieved, but control can also be exerted over the level of trigger expression, with a resulting variation in the degree to which the target is silenced. Knockdown can also be controlled in a temporal and cell-type-dependent fashion through the use of well-established transgenic methodologies and well-tested promoters. The forms of encoded triggers vary. Long double-stranded RNAs can be expressed as extended inverted repeats. The nearest equivalent of a small interfering RNA is an artificial microRNA (miRNA) or short hairpin RNA (shRNA), where a natural miRNA backbone (also called a scaffold) is remodeled to produce a different small RNA or a small inverted repeat (&lt;30 nucleotides) is simply expressed. This protocol describes creation of transgenic Drosophila carrying shRNA inserts in a remodeled endogenous miRNA backbone. The protocol applies to the use of miRNA-based shRNAs, but most of the vectors, principles of experimental design, and methods are also applicable to long inverted repeat transgenes.

Generation of Transgenic Drosophila Expressing shRNAs in the miR-1 Backbone