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Epistasis and its contribution to genetic variance components

J M Cheverud¹, E J Routman

¹Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

|March 1, 1995

Summary

We developed a new method to measure physiological epistasis, distinct from its impact on genetic variance. This allows for better understanding of epistasis

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Area of Science:

Genetics
Evolutionary Biology
Quantitative Genetics

Background:

Epistasis, the deviation of combined genetic effects from individual effects, is crucial in genetics.
Existing methods often conflate epistasis with its contribution to genetic variance.
Understanding epistasis is key to explaining evolutionary processes.

Purpose of the Study:

To introduce a novel parameterization for physiological epistasis.
To enable the measurement of epistasis independently of its effects on genetic variance components.
To facilitate the study of epistasis' role in evolution.

Main Methods:

Developed a new parameterization for physiological epistasis.
Derived statistical tests for epistasis using two-locus genotypic value estimates.
Specified the contributions of epistasis to additive, dominance, and interaction genetic variances.

Main Results:

The new parameterization successfully separates epistasis from epistatic genetic variance.
Statistical tests for epistasis are now feasible with quantitative trait locus (QTL) data.
Epistasis significantly contributes to additive, dominance, and interaction genetic variances.
The parameterization quantifies epistasis' contribution to additive genetic variance.

Conclusions:

The proposed parameterization offers a refined approach to studying epistasis.
This method enhances the understanding of epistasis' influence on genetic architecture and evolution.
It provides a foundation for investigating the evolutionary significance of epistasis through its impact on additive genetic variance.

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