Abstract:
:Low-level ectopic expression of the Runt transcription factor blocks activation of the Drosophila melanogaster segmentation gene engrailed (en) in odd-numbered parasegments and is associated with a lethal phenotype. Here we show, by using a genetic screen for maternal factors that contribute in a dose-dependent fashion to Runt-mediated repression, that there are two distinct steps in the repression of en by Runt. The initial establishment of repression is sensitive to the dosage of the zinc-finger transcription factor Tramtrack. By contrast, the co-repressor proteins Groucho and dCtBP, and the histone deacetylase Rpd3, do not affect establishment but instead maintain repression after the blastoderm stage. The distinction between establishment and maintenance is confirmed by experiments with Runt derivatives that are impaired specifically for either co-repressor interaction or DNA binding. Other transcription factors can also establish repression in Rpd3-deficient embryos, which indicates that the distinction between establishment and maintenance may be a general feature of eukaryotic transcriptional repression.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Wheeler JC,VanderZwan C,Xu X,Swantek D,Tracey WD,Gergen JPdoi
10.1038/ng942keywords:
subject
Has Abstractpub_date
2002-09-01 00:00:00pages
206-10issue
1eissn
1061-4036issn
1546-1718pii
ng942journal_volume
32pub_type
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