C-terminal binding protein 1 / brefeldin A (BFA) -dependent ADP-ribosylation substrate (CtBP1/BARS) is a highly conserved transcriptional corepressor, that plays a critical role in regulating gene expression patterns throughout development and in oncogenesis. CtBP regulates target gene transcription, in part, via recruitment of histone deacetylases involved in gene silencing and may act to coordinate histone modifications that regulate gene expression.