Abstract
The organization of the gene coding for alcohol dehydrogenase (Adh) in Drosophila affinidisjuncta has been determined by physically mapping Adh RNA transcripts to cloned genomic DNA. Two distinct transcript types accumulate with developmental specificity. Because only a single genomic Adh locus is detected in D. affinidisjuncta , and since all Adh transcripts appear to be identical except at their termini, the two Adh RNA types are products of the same gene. One type of transcript, abundant in adults, contains a small 5' terminal exon that is completely lacking in the other type of transcript, which accumulates in larvae. This 5' end difference suggests that the D. affinidisjuncta Adh gene, like the homologous gene from the distantly related species D. melanogaster, is expressed from two promoters. According to the transcription map, these D. affinidisjuncta promoters are separated by approximately 560 base pairs of genomic DNA sequence. D. affinidisjuncta Adh transcripts also resemble D. melanogaster Adh transcripts in both their overall organization and their developmental distribution. Multiple 3' ends are responsible for the size heterogeneity of both types of D. affinidisjuncta Adh RNA, and some of these also appear with stage specificity.
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