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Development, Vol 120, Issue 4 815-826, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
B Kramatschek and JA Campos-Ortega
Institut fur Entwicklungsbiologie, Universitat zu Koln, Germany.
The Enhancer of split gene complex (E(SPL)-C) of Drosophila comprises seven genes encoding bHLH proteins, which are required by neuroectodermal cells for epidermal development. Using promoter and gene fusions with the lacZ gene, we determined the location of cis-acting sequences necessary for normal expression of two of the genes of the E(SPL)-C, E(spl) and HLH-m5. About 0.46 kb of E(spl) and 1.9 kb of HLH-m5 upstream sequences are necessary to reproduce the normal transcription pattern of these genes. The gene products of achaete, scute and lethal of scute, together with that of ventral nervous system condensation defective, act synergistically to specify the neuroectodermal E(spl) and HLH-m5 expression domains. Negative cross- and autoregulatory interactions of the E(SPL)-C on E(spl) contribute, directly or indirectly, to this regulation. Interactions involve DNA binding, since mutagenesis of binding sites for bHLH proteins in the E(spl) promoter abolishes neuroectodermal expression and activates ectopic expression in neuroblasts. A model for activation and repression of E(spl) in the neuroectoderm and neuroblasts, respectively, is proposed.
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