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. 1990 Dec;9(13):4267–4275. doi: 10.1002/j.1460-2075.1990.tb07875.x

Interactions of Polycomb and trithorax with cis regulatory regions of Ultrabithorax during the development of Drosophila melanogaster.

J E Castelli-Gair 1, A García-Bellido 1
PMCID: PMC552209  PMID: 2124969

Abstract

The activity of the Ultrabithorax gene is continuously required during imaginal development to maintain the morphogenetic identity of the third thoracic segment of Drosophila. The spatial pattern of Ultrabithorax gene expression depends on certain cis regulatory regions and several trans regulatory genes. Amongst the latter the Polycomb gene is necessary to maintain Ultrabithorax repressed in cells where it was not initially activated and the trithorax gene is required for maintaining the expression of the gene where initially active. We have studied genetic interactions between several Ultrabithorax mutations in coding and cis regulatory regions in combination with Polycomb and trithorax mutations. Our results suggest that Polycomb and trithorax gene products do not interact with Ultrabithorax protein products but interact (directly or indirectly) with specific and discrete cis regulatory regions such as those where anterobithorax and postbithorax but not bithorax mutations map. We discuss possible mechanisms of these interactions.

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