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Combined Sequenced-Based Model of the Drosophila Gap Gene Network

Transcription is vital for normal functioning of all organisms, as it is the most significant regulation level of gene expression. An interest in detailed analysis of transcriptional regulation grows due to new large-scale data acquisition techniques. There is a large amount of experimental data available about the Drosophila segment determination system. The gap gene system implements the most upstream regulatory layer of the segmentation gene network. It receives inputs from long-range protein gradients encoded by maternal coordinate genes and establishes discrete territories of gene expression. In this process the gap gene cross-regulation plays important role. The formation of gap gene expression domains is a dynamic process: the domains do not form in one place, but instead in the posterior half of the embryo they shift anteriorly during cleavage cycle 14. Despite our expanding knowledge of the biochemistry of gene regulation, we lack a quantitative understanding of this process at a molecular level.