Molecular Biology and Evolution, Vol 9, 1029-1049, Copyright © 1992 by Society for Molecular Biology and Evolution
NM Schiff, Y Feng, JA Quine, PA Krasney and DR Cavener
During the preadult development of Drosophila melanogaster, the GLD
(glucose dehydrogenase) gene (Gld) is expressed in a variety of tissues,
including the immature reproductive tract. At the adult stage the
expression of Gld becomes largely restricted to the reproductive tract of
males and females. We examined the expression of GLD in the adult
reproductive tract of 50 species in the genus Drosophila, as well as in
those of a few representative species from four other closely related
genera. GLD exhibits considerable organ-specific diversity in the
reproductive tract of males and females. Among these species, five male GLD
phenotypes and six female GLD phenotypes were found. In contrast, the
preadult expression of GLD in representative species from each distinct
adult pattern type was determined and found to be highly conserved in both
the immature reproductive tract and non-reproductive organs. Moreover, the
set of reproductive organs that express GLD during preadult development is
equivalent to the sum of the five male and six female adult GLD phenotypes.
To initially define the contribution of cis- versus trans-acting factors
responsible for differences in adult GLD expression between two of these
species--D. melanogaster and D. pseudoobscura--we transferred the D.
pseudoobscura Gld to the genome of D. melanogaster and investigated its
expression. GLD expression patterns of these transformants displayed
characteristics that are unique to both species, suggesting the presence of
both cis- and trans-acting differences between these two species.
ORIGINAL ARTICLE
Evolution of the expression of the Gld gene in the reproductive tract of Drosophila
Department of Molecular Biology, Vanderbilt University, Nashville, Tennessee 37235.
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