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Developmental modulation of Fab-7 boundary function.

Susan E Schweinsberg¹, Paul Schedl

¹Department of Molecular Biology, Princeton University, Princeton, NJ 08540, USA.

Development (Cambridge, England)

|August 27, 2004

Summary

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The Fab-7 boundary in Drosophila ensures gene regulation across development. Surprisingly, its continuous activity arises from distinct, stage-specific elements, revealing dynamic control over genetic domains.

Area of Science:

Developmental Biology
Genetics
Molecular Biology

Background:

The Fab-7 boundary is crucial for autonomous activity of cis-regulatory domains (iab-6, iab-7) in the Drosophila Bithorax Complex.
Fab-7 is active throughout development and in all examined tissues, similar to constitutive boundaries in eukaryotes.

Purpose of the Study:

To investigate the mechanism behind the constitutive activity of the Fab-7 boundary.
To determine if developmentally restricted sub-elements contribute to Fab-7's overall function.

Main Methods:

In vivo analysis of the Fab-7 boundary in Drosophila.
Examination of separable regions within the Fab-7 boundary for stage-specific function.

Main Results:

Related Experiment Videos

The constitutive activity of Fab-7 is generated by combining sub-elements with developmentally restricted boundary function.

In vivo evidence shows separable regions within Fab-7 function at different developmental stages.

Conclusions:

Fab-7's continuous function is achieved through a combination of temporally regulated sub-elements.
Genetic regulatory domains can dynamically change size by switching insulator function on or off.