Genetic background affects epistatic interactions between two beneficial mutations

Author:

Wang Yinhua1,Díaz Arenas Carolina1,Stoebel Daniel M.2,Cooper Tim F.1

Affiliation:

1. Department of Biology and Biochemistry, University of Houston, Houston, TX 77204, USA

2. Department of Biology, Harvey Mudd College, Claremont, CA 91711, USA

Abstract

The phenotypic effect of mutations can depend on their genetic background, a phenomenon known as epistasis. Many experimental studies have found that epistasis is pervasive, and some indicate that it may follow a general pattern dependent on the fitness effect of the interacting mutations. These studies have, however, typically examined the effect of interactions between a small number of focal mutations in a single genetic background. Here, we extend this approach by considering how the interaction between two beneficial mutations that were isolated from a population of laboratory evolvedEscherichia colichanges when they are added to divergent natural isolate strains ofE. coli. We find that interactions between the focal mutations and the different genetic backgrounds are common. Moreover, the pair-wise interaction between the focal mutations also depended on their genetic background, being more negative in backgrounds with higher absolute fitness. Together, our results indicate the presence of interactions between focal mutations, but also caution that these interactions depend quantitatively on the wider genetic background.

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,Agricultural and Biological Sciences (miscellaneous)

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