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Development ePress online publication date 31 Mar 2004
doi: 10.1242/dev.01077

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Research article

A genomic analysis of Drosophila somatic sexual differentiation and its regulation


Michelle N. Arbeitman, Alice A. Fleming, Mark L. Siegal, Brian H. Null, and Bruce S. Baker*
* Author for correspondence (e-mail: bbaker{at}pmgm2.stanford.edu)

In virtually all animals, males and females are morphologically, physiologically and behaviorally distinct. Using cDNA microarrays representing one-third of Drosophila genes to identify genes expressed sex-differentially in somatic tissues, we performed an expression analysis on adult males and females that: (1) were wild type; (2) lacked a germline; or (3) were mutant for sex-determination regulatory genes. Statistical analysis identified 63 genes sex-differentially expressed in the soma, 20 of which have been confirmed by RNA blots thus far. In situ hybridization experiments with 11 of these genes showed they were sex-differentially expressed only in internal genital organs. The nature of the products these genes encode provides insight into the molecular physiology of these reproductive tissues. Analysis of the regulation of these genes revealed that their adult expression patterns are specified by the sex hierarchy during development, and that doublesex probably functions in diverse ways to set their activities.
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