Cell cycle population effects in perturbation studies.

Area of Science:

• Cellular biology
• Yeast genetics
• Systems biology

Background:

• Gene function disruption and growth condition perturbations are standard methods in cellular systems research.
• Indirect cellular effects from these perturbations are often uncharacterized, complicating data interpretation.

Purpose of the Study:

• To identify and characterize common, indirect gene expression signatures in Saccharomyces cerevisiae deletion strains.
• To investigate the relationship between growth rate changes and gene expression patterns following perturbations.

Main Methods:

• Analysis of gene expression profiles in functionally unrelated Saccharomyces cerevisiae deletion strains.
• Correlation of gene expression signatures with observed growth rates.
• Examination of cell cycle phase distribution in response to perturbations.

Main Results:

• A common gene expression signature was identified across diverse, functionally unrelated deletion strains.
• This signature strongly correlated with slower growth rates.
• The signature closely resembled the environmental stress response (ESR) and was primarily attributed to cell cycle redistribution, specifically an increase in the G1 population, rather than direct cellular responses.

Conclusions:

• The identified slow growth signature and ESR are largely artifacts of cell cycle redistribution, not direct responses to perturbation.
• These findings impact the interpretation of studies involving genetic or environmental perturbations accompanied by growth rate changes.
• Strategies to mitigate these indirect effects are discussed, offering improved experimental design for cellular studies.