We studied the interaction of two oscillators, the cell division cycle (CDC) and yeast metabolic cycle (YMC) in budding yeast. Previous work suggested that these cycles interact to separate high oxygen consumption from DNA replication to prevent genetic damage. To test this hypothesis, Tony Burnetti grew genetically diverse strains at a number of growth rates and measured DNA replication and oxygen consumption with high temporal resolution. His data showed that high oxygen consumption is not strictly separated from DNA replication; rather, cell cycle Start was coupled with the initiation of high oxygen consumption and catabolism of storage carbohydrates. The function of this YMC-CDC coupling may be to ensure that DNA replication and cell division occur only when sufficient cellular energy reserves have accumulated. More generally, our approach shows how studies in genetically diverse strains efficiently identify robust phenotypes and steer the experimentalist away from strain-specific idiosyncrasies.
Burnetti AJ, Aydin M, Buchler NE. Cell cycle Start is coupled to entry into the yeast metabolic cycle across diverse strains and growth rates. Mol. Biol. Cell 27: 64 (2016)