Abstract
To investigate the factors contributing to regulation of expression of the Drosophila segmentation gene even-skipped (eve), we have analyzed both the in vitro transcription and eve-promoter-binding proteins in embryo extracts. We show that the eve promoter is accurately and efficiently expressed in nuclear extracts derived from Drosophila embryos and that transcription is more efficient in extracts prepared from embryos at early stages of development than in those from older embryos, broadly reproducing the temporal pattern of expression observed in vivo. This stage-specific expression is dependent on sequences upstream of the eve transcription start site which contain multiple binding sites for at least two distinct proteins present in embryo nuclei. One of these proteins, the binding sites for which correspond to the sequences required for stage-specific expression, appears to be the previously described GAGA factor. Although the binding activity of the GAGA factor remains constant, the level of the binding activity of the other protein, which we have called the TCCT factor, changes during the course of embryogenesis. Activity is first detected 3 to 5 h after fertilization and decreases during later stages of embryogenesis. We discuss the possibility that the TCCT factor plays a role in the maintenance or refinement of the eve expression pattern.
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