Direct competition between Brinker and Drosophila Mad in Dpp target gene transcription.

Abstract:

:Brinker is a nuclear protein that antagonizes Dpp signalling in Drosophila. Its expression is negatively regulated by Dpp. Here, we show that Brinker represses Ultrabithorax (Ubx) in the embryonic midgut, a HOX gene that activates, and responds to, the localized expression of Dpp during endoderm induction. We find that the functional target for Brinker repression coincides with the Dpp response sequence in the Ubx midgut enhancer, namely a tandem of binding sites for the Dpp effector Mad. We show that Brinker efficiently competes with Mad in vitro, preventing the latter from binding to these sites. Brinker also competes with activated Mad in vivo, blocking the stimulation of the Ubx enhancer in response to simultaneous Dpp signalling. These results indicate how Brinker acts as a dominant repressor of Dpp target genes, and explain why Brinker is a potent antagonist of Dpp.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Saller E,Bienz M

doi

10.1093/embo-reports/kve068

keywords:

subject

Has Abstract

pub_date

2001-04-01 00:00:00

pages

298-305

issue

4

eissn

1469-221X

issn

1469-3178

pii

2/4/298

journal_volume

2

pub_type

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