Strand D J, McDonald J F
Department of Genetics, University of Georgia, Athens 30602.
Genetics. 1989 Apr;121(4):787-94. doi: 10.1093/genetics/121.4.787.
The Drosophila melanogaster alcohol dehydrogenase gene (adh) is under the control of two separate promoters (proximal and distal) which are preferentially utilized at the larval and adult life stages, respectively. A variant alcohol dehydrogenase allele (RI-42) isolated from a natural population contains a copia retroviral-like transposable element inserted 240 bp upstream from the distal (adult) adh transcriptional start site. Levels of adh transcripts in the RI-42 variant are reduced in tissues and at life stages where copia is actively expressed and are affected in trans- by mutant alleles at the suppressor-of-white-apricot (su(wa] and suppressor-of-forked (su(f] loci. These suppressor genes have no effect on adh expression in wild-type Drosophila.
黑腹果蝇乙醇脱氢酶基因(adh)受两个独立启动子(近端和远端)的调控,它们分别在幼虫和成虫生命阶段被优先利用。从自然种群中分离出的一个乙醇脱氢酶变异等位基因(RI - 42),在远端(成虫)adh转录起始位点上游240 bp处插入了一个类反转录病毒转座因子copia。在copia活跃表达的组织和生命阶段,RI - 42变异体中adh转录本的水平降低,并且受到白色杏色抑制基因(su(wa))和叉状抑制基因(su(f))位点的突变等位基因的反式影响。这些抑制基因对野生型果蝇中的adh表达没有影响。