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. 1988 Jan;7(1):177–188. doi: 10.1002/j.1460-2075.1988.tb02798.x

A cis-acting element and associated binding factor required for CNS expression of the Drosophila melanogaster dopa decarboxylase gene.

S J Bray 1, W A Johnson 1, J Hirsh 1, U Heberlein 1, R Tjian 1
PMCID: PMC454243  PMID: 2834202

Abstract

A cis-acting sequence from the Drosophila melanogaster dopa decarboxylase (Ddc) gene is selectively required for Ddc expression in the central nervous system. We analyze several parameters influencing the function of the sequence element and describe a factor which interacts with it and mediates CNS expression of Ddc. The element, element I, can function in vivo when included on a synthetic oligonucleotide inserted near its normal location, or closer to the RNA startpoint. It displays partial activity when inverted. Two different 2-bp mutations in element I abolish its ability to stimulate neuronal Ddc expression in the CNS. A factor present in embryonic nuclear extracts specifically protects element I in DNase I footprinting assays. The binding affinity of this factor is reduced by each alteration of element I that inhibits neuronal expression, indicating a role in mediating CNS expression of Ddc. Element I alone has no detectable activity when placed adjacent to a heterologous promoter, although 2.2 kb of 5' Ddc sequences direct correct cell-specific expression of a heterologous promoter.

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