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Model Organisms in Drug Discovery

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EVOLUTIONARY CONSERVATION OF DISEASE-RELATED PATHWAYS 125<br />

case the rough eye phenotype caused by ectopic activation of the Wnt pathway. (D) An EP<br />

overexpression screen. The EP element carries GAL4 b<strong>in</strong>d<strong>in</strong>g sites (UAS sites) and a basal<br />

promoter that directs expression of any gene that happens to lie next to its <strong>in</strong>sertion site. In<br />

comb<strong>in</strong>ation with the tissue-specific expression of the GAL4 transcription factor that b<strong>in</strong>ds<br />

to the UAS element, the system is activated and allows the study of over- or misexpression<br />

phenotypes of tagged genes <strong>in</strong> the appropriate tissue. (See text for detail and references)

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