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Interactions between the regulatory regions of twoAdh alleles

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Abstract

A region (NS1) that acts like an enhancer is located approximately 300 bp upstream of the larval cap site in theAdh gene ofD. melanogaster. When this sequence is deleted (ΔNS1), the gene fails to express ADH protein. Gene expression can be restored by placing a secondAdh gene with an intact enhancer elsewhere on the same plasmid. In these circumstances, both genes are expressed equally regardless of their orientation on the plasmid. In this report we further characterize the interactions that occur when a single enhancer activates expression from a proximal and distant promoter. We have made the following observations: (1) While the two genes are expressed equivalently, their expression relative to a plasmid carrying two intact genes is reduced by a factor of 2 to 6 depending on the orientation of the two genes. (2) The single enhancer drives expression of both genes on any given plasmid molecule. (3) The enhancer does not interact with theAdh gene from which the NS7 region (which spans the larval TATA box) is removed. (4) Expression of the ΔNS1 gene can be restored by an intact gene when both are inserted together into theDrosophila genome via P element-mediated transformation. (5) Increasing the separation between the two genes on a plasmid by up to 15 kbp does not prevent the restoration of expression of the ΔNS1 gene. We propose a model that explains how a single enhancer can stimulate equal expression from two genes.

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Authors and Affiliations

  1. Waksman Institute, Rutgers, the State University of New Jersey, 08854-0759, Piscataway, NJ, USA

    Richard Freidman, Elizabeth Hotaling & William Sofer

  2. Department of Biological Sciences, Rutgers, the State University of New Jersey, 07102, Newark, NJ, USA

    Leonard Borack

Authors
  1. Richard Freidman
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  2. Elizabeth Hotaling
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  3. Leonard Borack
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  4. William Sofer
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Freidman, R., Hotaling, E., Borack, L. et al. Interactions between the regulatory regions of twoAdh alleles. Genetica 97, 1–14 (1996). https://doi.org/10.1007/BF00132575

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  • DOI: https://doi.org/10.1007/BF00132575

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