The Adh Gene Promoters of Drosophila Melanogaster and Drosophila Orena Are Functionally Conserved and Share Features of Sequence Structure and Nuclease-protected Sites
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The sibling species Drosophila melanogaster and D. orena show similar patterns of alcohol dehydrogenase expression, both spatially and temporally. These two species diverged from a common ancestor 6 million to 15 million years ago, and the DNA sequences of the promoter regions of their Adh genes show a mosaic pattern of conservation and change. By interspecific transformation of D. orena sequences into D. melanogaster, we demonstrate a functional equivalence between these sequences. Using both D. melanogaster embryo extracts and purified transcription factor Adf-1, we compare the protection of these promoter sequences from nuclease, demonstrating considerable conservation.
Polytene chromosomes as indicators of phylogeny in several species groups of Drosophila.
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