Regulatory region of three bithorax complex genes, Ultrabithorax (Ubx), abdominal-A (abd-A), and Abdominal-B (Abd-B) can be divided into nine iab domains, capable of directing expression of one of the genes in certain abdominal parasegment of Drosophila. In the Abd-B regulatory region, three insulators were identified, including Fab-7 and Fab-8, which flanked the iab-7 domain, and Mcp, which separated the Abd-B and abd-A regulatory regions. It was suggested that boundary insulators formed a barrier between active and repressed chromatin. In the present study, using the yellow and white reporter genes and different combinations of known insulators, Mcp, Fab-7, and Fab-8, it was demonstrated that only specific interaction of two insulators was capable of isolation of active and repressed chromatin, i.e., the formation of independent expression domains.
Russian Journal of Genetics – Springer Journals
Published: Dec 8, 2011
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