Protocol for mapping gene essentiality changes in yeast using inducible gene deletion mutants

Area of Science:

• Genetics
• Molecular Biology
• Yeast Biology

Background:

• Gene essentiality is crucial for organism survival but can vary between genetically distinct individuals.
• Understanding these variations is key to comprehending genetic diversity and adaptation in species like Saccharomyces cerevisiae.

Purpose of the Study:

• To present a systematic protocol for identifying genes with differential essentiality across yeast isolates.
• To enable researchers to investigate how gene essentiality varies in non-laboratory yeast strains compared to a standard laboratory strain.

Main Methods:

• Utilizing a collection of inducible essential gene deletion mutants in a laboratory Saccharomyces cerevisiae background.
• Crossing this mutant collection with a yeast isolate of interest.
• Selecting haploid segregant progeny, inducing essential gene loss, and assessing cell viability.

Main Results:

• The protocol facilitates the identification of genes essential in the laboratory strain but not in other tested isolates.
• It provides a framework for comparative genomics and functional analysis of gene essentiality.

Conclusions:

• This systematic approach is valuable for discovering genes with context-dependent essentiality.
• The protocol aids in understanding the genetic basis of phenotypic variation in yeast populations.