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RESEARCH PAPER
Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts, 02129 USA
To determine which E2F/RB-family members are functionally important at E2F-dependent promoters, we used RNA interference (RNAi) to selectively remove each component of the dE2F/dDP/RBF pathway, and we examined the genome-wide changes in gene expression that occur when each element is missing. The results reveal a remarkable division of labor between family members. Classic E2F targets, encoding functions needed for cell cycle progression, are expressed in cycling cells and are primarily dependent on dE2F1and RBF1for regulation. Unexpectedly, there is a second program of dE2F/RBF-dependent transcription, in which dE2F2/RBF1or dE2F2/RBF2 complexes repress gene expression in actively proliferating cells. These new E2F target genes encode differentiation factors that are transcribed in developmentally regulated and gender-specific patterns and not in a cell cycle-regulated manner. We propose that dE2F/RBF complexes should not be viewed simply as a cell cycle regulator of transcription. Instead, dE2F/RBF-mediated repression is exerted on genes that encode an assortment of cellular functions, and these effects are reversed on sets of functionally related genes in particular developmental contexts. As a result, dE2F/RBF regulation is used to link gene expression with cell cycle progression at some targets while simultaneously providing stable repression at others.
[Keywords: E2F; retinoblastoma protein; RBF; Drosophila; cell cycle; differentiation]
Received May 28, 2003; revised version accepted July 21, 2003.
Article and publication are at http://www.genesdev.org/cgi/doi/10.1101/gad.1116703.
1 These authors contributed equally to this work.
2 Corresponding author.
E-MAIL dyson{at}helix.mgh.harvard.edu; FAX (617) 726-7808.
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