Enrichment of aging yeast cells and budding polarity assay in Saccharomyces cerevisiae

Replicative lifespan, a measure of the number of times that a yeast cell can divide before senescence, is one model for aging. Here, we provide a protocol for enrichment of yeast as a function of replicative age using a miniature chemostat aging device (mCAD). This protocol allows for isolation of quantities of cells that are sufficient for biochemical or genomic analysis. We also describe an approach to assess bud site selection, a marker for cell polarity, during the aging process. For complete details on the use and execution of this protocol, please refer to Yang et al. (2022).