Coevolution of the glucose dehydrogenase gene and the ejaculatory duct in the genus Drosophila |
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Authors: | Cavener DR |
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Institution: | Department of Molecular Biology, Vanderbilt University, Nashville, Tennessee 37235. |
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Abstract: | The glucose dehydrogenase gene (Gld) in Drosophila melanogaster exhibits a
unique spatial and temporal pattern of expression. GLD expression switches
from a non-sex-limited state at the pupal stage to a male-limited state at
the adult stage. At the adult stage, the enzyme is restricted to the
ejaculatory duct. Within the genus Drosophila, the ejaculatory duct has
undergone a simple morphological divergence. In order to determine whether
correlated changes in GLD expression had occurred, GLD activity during the
pupal and adult stages was determined for several Drosophila species. It
was found that virtually all of the species exhibit pupal GLD activity,
whereas only those species with an expanded ejaculatory duct express
male-limited GLD. The results of interspecific genital imaginal disc
transplantation experiments indicate that the expanded morphology and GLD
expression do not require any species- or sex-specific diffusible factors.
An apparent regulatory polymorphism exists within the D. takahashii species
with respect to male-limited GLD expression.
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