Analysis of the Promoter of the ninaE Opsin Gene in Drosophila melanogaster

Drzislav Mismer ¹ and Gerald M. Rubin ¹

¹ Department of Biochemistry, University of California, Berkeley, California 94720

We have analyzed the cis-acting regulatory sequences of the ninaE gene. This gene encodes the major Drosophila melanogaster opsin, the protein component of the primary chromophore of photoreceptor cells R1–R6 of the adult eye. DNA fragments containing the start point of transcription of the ninaE gene were fused to either the Escherichia coli chloramphenicol acetyltransferase or lacZ (ß-galactosidase) gene and introduced into the Drosophila germline by P-element-mediated transformation. Expression of the E. coli genes was then used to assay the ability of various sequences from the ninaE gene to confer the ninaE pattern of expression. Fragments containing between 2.8 kb and 215 bp of the sequences upstream of the start of transcription plus the first 67 bp of the untranslated leader were able to direct nearly wild-type expression. We have identified three separable control regions in the ninaE promoter. The first, which has the properties of an enhancer element, is located between nucleotides -501 and -219. The removal of this sequence had little effect on promoter function; this sequence appears to be redundant. However, it appears to be able to substitute for the second control region which is located between nucleotides -215 and -162, and which also affects the level of output from this promoter. Removal of these two control regions resulted in a 30-fold decrease in expression; however tissue specificity was not affected. The third control region, located downstream from nucleotide -120, appears to be absolutely necessary for promoter function in the absence of the first two regulatory sequences. Examination of larvae containing fusion genes expressing ß-galactosidase suggests that the ninaE gene is also expressed in a subset of cells in the larval photoreceptor organ.

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