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Mol. Cell. Biol., 01 1998, 450-458, Vol 18, No. 1
Copyright © 1998, American Society for Microbiology

Regulation of sex-specific selection of fruitless 5' splice sites by transformer and transformer-2

V Heinrichs, LC Ryner and BS Baker
Department of Biological Sciences, Stanford University, California 94305-5020, USA. vheinric@cmgm.stanford.edu

In Drosophila melanogaster, the fruitless (fru) gene controls essentially all aspects of male courtship behavior. It does this through sex-specific alternative splicing of the fru pre-mRNA, leading to the production of male-specific fru mRNAs capable of expressing male- specific fru proteins. Sex-specific fru splicing involves the choice between alternative 5' splice sites, one used exclusively in males and the other used only in females. Here we report that the Drosophila sex determination genes transformer (tra) and transformer-2 (tra-2) switch fru splicing from the male-specific pattern to the female-specific pattern through activation of the female-specific fru 5' splice site. Activation of female-specific fru splicing requires cis-acting tra and tra-2 repeat elements that are part of an exonic splicing enhancer located immediately upstream of the female-specific fru 5' splice site and are recognized by the TRA and TRA-2 proteins in vitro. This fru splicing enhancer is sufficient to promote the activation by tra and tra-2 of both a 5' splice site and the female-specific doublesex (dsx) 3' splice site, suggesting that the mechanisms of 5' splice site activation and 3' splice site activation may be similar.

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