Genetic control and evolution of sexually dimorphic characters in Drosophila.
Sexually dimorphic abdominal pigmentation and segment morphology evolved recently in the melanogaster species group of the fruitfly Drosophila. Here we show that these traits are controlled by the bric à brac [corrected] (bab) gene, which integrates regulatory inputs from the homeotic and sex-determination pathways. bab expression is modulated segment- and sex-specifically in sexually dimorphic species, but is uniform in sexually monomorphic species. We suggest that bab has an ancestral homeotic function, and that regulatory changes at the bab locus played a key role in the evolution of sexual dimorphism. Pigmentation patterns specified by bab affect mating preferences, suggesting that sexual selection has contributed to the evolution of bab regulation.
Kopp
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A
Howard Hughes Medical Institute and Laboratory of Molecular Biology, University of Wisconsin-Madison, 53706-1596, USA.
Duncan
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I
Godt
D
D
Carroll
S B
SB
D000818:Animals; D005075:Biological Evolution; D004268:DNA-Binding Proteins / Q000235:genetics*; D029721:Drosophila Proteins; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics*; D019143:Evolution, Molecular; D005260:Female; D018507:Gene Expression Regulation, Developmental; D005801:Genes, Homeobox; D017344:Genes, Insect; D019476:Insect Proteins / Q000235:genetics; D008297:Male; D008957:Models, Genetic; D010858:Pigmentation / Q000235:genetics*; D012098:Reproduction; D012727:Sex Characteristics; D012733:Sex Differentiation / Q000235:genetics; D013045:Species Specificity; D014157:Transcription Factors / Q000235:genetics*
C093752:Bric-a-brac protein 1, Drosophila; D004268:DNA-Binding Proteins; C070369:DSX protein, Drosophila; D029721:Drosophila Proteins; D019476:Insect Proteins; D014157:Transcription Factors