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Development, Vol 125, Issue 8 1495-1500, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
G Saccone, I Peluso, D Artiaco, E Giordano, D Bopp and LC Polito
Dipartimento di Genetica, Biologia generale e Moleculare, Universita degli Studi di Napoli 'Federico II', Napoli, Italy. saccone@biol.dgbm.unina.it
In Drosophila, Sxl functions as a binary switch in sex determination. Under the control of the primary sex-determining signal, it produces functional protein only in XX animals to implement female development. Here we report that, in contrast to Drosophila, the Sxl homologue in the Medfly, Ceratitis capitata, expresses the same mRNAs and protein isoforms in both XX and XY animals irrespective of the primary sex-determining signal. Also, experiments with two inducible transgenes demonstrate that the corresponding Ceratitis SXL product has no significant sex-transforming effects when expressed in Drosophila. Similar results have been obtained for the Sxl homologue of Musca domestica (Meise, M., Hilfiker-Kleiner, D., Brunner, C., DLbendorfer, A., N?thiger, R. and Bopp, D. (1998) Development 125, 1487-1494). Our findings suggest that Sxl acquired its master regulatory role in sex determination during evolution of the Acalyptratae group, most probably after phylogenetic divergence of the genus Drosophila from other genera of this group.
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