A Fragment of engrailed Regulatory DNA Can Mediate Transvection of the white Gene in Drosophila

INVESTIGATIONS

A Fragment of engrailed Regulatory DNA Can Mediate Transvection of the white Gene in Drosophila

J. A. Kassis, E. P. VanSickle and S. M. Sensabaugh
Laboratory of Cellular and Molecular Biology, Division of Biochemistry and Biophysics, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892

We have found a fragment of engrailed regulatory DNA that has an unusual effect on expression of a linked marker gene, white, in the P element transposon CaSpeR. Normally, flies homozygous for a given CaSpeR insertion have darker eyes than heterozygotes. However, when a particular engrailed DNA fragment is included in that transposon, homozygotes often have lighter eyes than heterozygotes. Thus, engrailed DNA appears to cause white expression to be repressed in homozygotes. The suppression of white is dependent on the proximity of the two transposons in the genome-either in cis (i.e., on the same chromosome) or in trans (i.e., on homologous chromosomes). Thus, the engrailed fragment is mediating a phenomenon similar to that mediated by the zeste gene at the white locus. However, the interactions we observe do not require, nor are influenced by, mutations of zeste. We suggest that the engrailed DNA contains one or more binding sites for a protein that facilitates interactions between transposons. The normal function of these sites may be to mediate interactions between distant cis-regulatory regions of engrailed, a large locus that extends over 70 kilobases.

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