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        RNAi in Cultured Drosophila Cells

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        Double-stranded RNA (dsRNA)-mediated interference, or RNAi, has emerged as an effective technique to phenocopy the loss of function of a given gene product. With this tool researchers can study the functions of individual molecules in living cells and elucidate the mechanisms that regulate cell division. For example, many molecules that are important for regulating mitosis and for controlling the assembly of the mitotic spindle are mutated in different cancer cell types (for a review, see ref. 1 ). Functional analysis in vivo of molecules that play a role in mitosis is best implemented by a genetic analysis. For this, genetically malleable organisms such as Drosophila, Caenorhabditis elegans , yeast, and other micro-organisms have been extremely useful. Whereas genetic analysis usually requires a long-term effort, RNAi provides a rapid method for the reverse genetic analysis of gene product function and can be exploited to great advantage. In the era of sequenced genomes, this technique provides a valuable tool for functional genomics. Here, a detailed procedure for RNAi in Drosophila cells in culture is presented.
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