Drosophila Fab-7 insulator effectively blocks polycomb-mediated repression in transgenic lines

Drosophila Fab-7 insulator effectively blocks polycomb-mediated repression in transgenic lines The bithorax complex (BX-C) genes have a regulatory region containing nine independent para-segment-specific enhancers. Inactivation of the enhancers is a result of Pc-mediated repression, which leads to the appearance of active and repressed domains. Active domains are supposed to be separated from the repressed domains by insulators on the domain boundaries. Three insulators were found in the BX-C by the ability to block enhancers in transgenic model systems. Here, we have demonstrated that one of these three well studied insulators, Fab-7, is able to protect the yellow gene transcription from the most powerful Polycomb-dependent silencer from the bxd regulatory domain of the Ultrabithorax gene (Ubx). The barrier activity requires a region containing GAF-binding sites. Interestingly, the silencer used in the model system (1.5 kb PRE from the regulatory region of Ubx) recruits a transgenic construct with a frequency of up to 47% into genomic regions that completely repress the yellow gene expression. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Drosophila Fab-7 insulator effectively blocks polycomb-mediated repression in transgenic lines

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/lp/springer_journal/drosophila-fab-7-insulator-effectively-blocks-polycomb-mediated-IBNM09P003
Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Biomedicine; Animal Genetics and Genomics; Microbial Genetics and Genomics; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1134/S1022795411090110
Publisher site
See Article on Publisher Site

Abstract

The bithorax complex (BX-C) genes have a regulatory region containing nine independent para-segment-specific enhancers. Inactivation of the enhancers is a result of Pc-mediated repression, which leads to the appearance of active and repressed domains. Active domains are supposed to be separated from the repressed domains by insulators on the domain boundaries. Three insulators were found in the BX-C by the ability to block enhancers in transgenic model systems. Here, we have demonstrated that one of these three well studied insulators, Fab-7, is able to protect the yellow gene transcription from the most powerful Polycomb-dependent silencer from the bxd regulatory domain of the Ultrabithorax gene (Ubx). The barrier activity requires a region containing GAF-binding sites. Interestingly, the silencer used in the model system (1.5 kb PRE from the regulatory region of Ubx) recruits a transgenic construct with a frequency of up to 47% into genomic regions that completely repress the yellow gene expression.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Mar 28, 2012

References

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