Replicative aging as a source of cell heterogeneity in budding yeast

Area of Science:

• Microbiology
• Cell Biology
• Genetics

Background:

• Microbial phenotypic variation is crucial for survival under stress.
• Cell division asymmetry generates heterogeneity, leading to replicative aging in mother cells.
• Early-life changes in yeast mother cells significantly impact population-level performance.

Purpose of the Study:

• To review early manifestations of replicative aging in Saccharomyces cerevisiae mother cells.
• To explore the functional consequences of age-dependent changes within the first ten cell cycles.
• To investigate the potential role of early aging as a bet-hedging mechanism.

Main Methods:

• Literature review of studies on microbial replicative aging.
• Analysis of age-dependent changes in stress resistance, genomic instability, protein aggregates, redox balance, and metabolism.
• Synthesis of data to understand the impact of early aging on microbial populations.

Main Results:

• Replicative aging in yeast mother cells involves early changes in stress resistance, genomic instability, protein aggregate levels, redox balance, and metabolism.
• These early-age changes occur within the first ten cell cycles.
• Some early aging manifestations might confer benefits during stress exposure.

Conclusions:

• Early replicative aging in yeast mother cells is a substantial source of population variation.
• This age-related variation may play a significant role in microbial adaptation to changing environments.
• Early aging could function as a bet-hedging strategy for microbial populations.