The identification of E2F1-specific target genes

Proceedings of the National Academy of Sciences of the United States of America
Julie WellsPeggy J Farnham

Abstract

The E2F family of transcriptional regulators consists of six different members. Analysis of E2F-regulated promoters by using cultured cells suggests that E2Fs may have redundant functions. However, animal studies have shown that loss of individual E2Fs can have distinct biological consequences. Such seemingly conflicting results could be due to a difference in E2F-mediated regulation in cell culture vs. animals. Alternatively, there may be genes that are specifically regulated by an individual E2F which have not yet been identified. To investigate this possibility further, we have analyzed gene expression in E2F1 nullizygous mice. We found that loss of E2F1 did not cause changes in expression of known E2F target genes, suggesting that perhaps E2F1-specific promoters are distinct from known E2F target promoters. Therefore, we used oligonucleotide microarrays to identify mRNAs whose expression is altered on loss of E2F1. We demonstrate by chromatin immunoprecipitation that several of the promoters that drive expression of the deregulated mRNAs selectively recruit E2F1, but not other E2Fs, and this recruitment is via an element distinct from a consensus E2F binding site. To our knowledge, these are as yet undocumented examples of ...Continue Reading

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