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. 1991 Oct 25;19(20):5713–5717. doi: 10.1093/nar/19.20.5713

A Drosophila Adh gene can be activated in trans by an enhancer.

I Rothberg 1, E Hotaling 1, W Sofer 1
PMCID: PMC328980  PMID: 1945848

Abstract

The ability of a segment of the Drosophila Adh gene to produce ADH activity in larvae is dependent upon the presence of a 53 bp sequence (called NS1) located between 289 and 341 bp upstream of the larval transcription start site. This sequence behaves like an enhancer in that it can stimulate gene activity when it is placed at various distances from, or on either side of, an Adh gene. Like a typical enhancer, NS1 does not ordinarily function in trans. However, when an Adh gene lacking NS1 is placed on one plasmid, and a second gene carrying NS1 is placed on another, and the two plasmids are interlocked in a catenane, both genes are active. This finding supports the mechanism of loop-mediated enhancer action.

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