Journal
EMBO REPORTS
Volume 3, Issue 9, Pages 840-845Publisher
WILEY
DOI: 10.1093/embo-reports/kvf170
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CSL [CBF-1, Su(H), Lag-1]-type transcription factors are the primary effectors of the Notch pathway, a signal transduction cascade that is essential for the development of all metazoan organisms. Interestingly, CSL proteins were originally classified as transcriptional repressors in vertebrates, but as transcriptional activators in model invertebrate organisms. Resolution of this paradox came with the realization that repression and activation by CSL proteins occurs in both systems and that the switch involves recruitment of distinct co-repressor and co-activator complexes. Although CSL proteins appear to utilize a common co-activator complex of largely similar constitution, recent studies have demonstrated that vertebrate and Drosophila CSL interact with a variety of distinct co-repressor complexes. This review highlights differences in composition and similarities in function of different CSL co-repressor complexes, which actively repress Notch pathway target genes in the absence of Notch pathway activity.
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