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Updated: Feb 12, 2026

In Vivo Forward Genetic Screen to Identify Novel Neuroprotective Genes in Drosophila melanogaster

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Genetic background effects in quantitative genetics: gene-by-system interactions.

Maria Sardi^1,2, Audrey P Gasch^3,4

¹Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, 53706, USA.

Current Genetics

|April 13, 2018

Summary

Genetic interactions, or epistasis, significantly impact traits, but their role is debated. Our study in yeast shows most genes affecting toxin tolerance depend heavily on the genetic background, highlighting widespread gene-system interactions.

Keywords:

Biofuels Epistasis Genetic architecture Quantitative genetics Stress tolerance

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Area of Science:

Genetics
Systems Biology
Molecular Biology

Background:

Cellular functions rely on protein interaction networks.
The influence of genetic interactions (epistasis) on phenotypic variation is debated.
Previous studies suggest genetic background can influence gene function.

Purpose of the Study:

To investigate the role of genetic background in mediating gene function.
To determine the prevalence of gene-by-system interactions in a model organism.
To assess the impact of epistasis on phenotypic variation, specifically in toxin tolerance.

Main Methods:

Utilized Saccharomyces cerevisiae (yeast) as a model organism.
Conducted an association study for toxin tolerance.
Analyzed gene function across different genetic backgrounds.

Main Results:

Identified extensive interactions between implicated genes and the genetic background.
Found that most genes affecting toxin tolerance were strain-specific.
Demonstrated that allele effects are highly dependent on the genetic context.

Conclusions:

Genetic background plays a crucial role in determining the phenotypic effects of genes.
Widespread gene-by-system interactions influence diverse traits.
New modeling approaches are needed to capture complex genotype-phenotype relationships.