Genomic characterization of perturbation sensitivity

Area of Science:

• Systems Biology
• Genomics
• Molecular Biology

Background:

• Gene function is often elucidated by observing system changes after gene knockout.
• Microarray technology enables whole-genome transcriptional profiling to identify genes affected by knockouts.
• Perturbation Sensitivity quantifies gene sensitivity to external perturbations in Saccharomyces cerevisiae.

Purpose of the Study:

• To define and analyze 'Perturbation Sensitivity' for genes in Saccharomyces cerevisiae.
• To characterize the properties of perturbation-sensitive genes.
• To understand the relationship between perturbation sensitivity and gene function.

Main Methods:

• Analyzing microarray data from hundreds of gene knockout experiments.
• Calculating the frequency of significant transcript level changes for each gene.
• Assigning a 'Perturbation Sensitivity' score to each gene in the Saccharomyces cerevisiae genome.

Main Results:

• Perturbation-sensitive genes are generally non-essential.
• Proteins encoded by perturbation-sensitive genes interact with fewer partners.
• More transcription factors bind upstream of perturbation-sensitive genes.
• Perturbation-sensitive and resistant gene groups exhibit distinct functional annotations.

Conclusions:

• Perturbation Sensitivity is a valuable metric for understanding gene function and cellular robustness.
• Genes with high perturbation sensitivity play roles in cellular response rather than essential housekeeping functions.
• The study highlights a clear functional dichotomy between perturbation-sensitive and resistant genes.