Interactions between su(Hw)-binding regions in neighboring y2 and scD1 alleles hinder trans-activation of the y2 promoter by yellow enhancers located on a homologous chromosome.

Abstract excerpt

The phenomenon of transvection has been well characterized for the yellow locus in Drosophila. Enhancers of a promoterless yellow locus in one homologous chromosome can activate the yellow promoter in the other when its own enhancers are blocked by the su(Hw) insulator introduced by the gypsy retrotransposon. Insertion of another gypsy into the neighboring scute locus hinders transvection presumably owing to...

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