Cell proliferation is controlled by a tightly-regulated transcriptional program, which ensures that cells only proceed through the cell division cycle when they receive the appropriate signals. This program is established by a network of conserved transcription factors, many of which are mutated or misregulated in cancer cells. The Benanti Lab uses yeast as a model system to study the connections between cell cycle-regulatory transcription factors, and to determine how phosphorylation and ubiquitination coordinate their activities. These studies are complemented by work in human cells aimed at understanding the regulation of oncogenic transcription factors that are core components of the cell cycle network.