Abstract
Interspecific differences in the tissue-specific patterns of expression displayed by the alcohol dehydrogenase (Adh) genes within the Hawaiian picture-winged Drosophila represent a rich source of evolutionary variation in gene regulation. Study of the cis-acting elements responsible for regulatory differences between Adh genes from various species is greatly facilitated by analyzing the behavior of the different Adh genes in a homogeneous background. Accordingly, the Adh gene from Drosophila grimshawi was introduced into the germ line of Drosophila melanogaster by means of P element-mediated transformation, and transformants carrying this gene were compared to transformants carrying the Adh genes from Drosophila affinidisjuncta and Drosophila hawaiiensis. The results indicate that the D. affinidisjuncta and D. grimshawi genes have relatively higher levels of expression and broader tissue distribution of expression than the D. hawaiiensis gene in larvae. All three genes are expressed at similar overall levels in adults, with differences in tissue distribution of enzyme activity corresponding to the pattern in the donor species. However, certain systematic differences between Adh gene expression in transformants and in the Hawaiian Drosophila are noted along with tissue-specific position effects in some cases. The implications of these findings for the understanding of evolved regulatory variation are discussed.
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