Effects of Epistasis and Pleiotropy on Fitness Landscapes

TL;DR

This paper investigates how epistasis and pleiotropy influence the structure of fitness landscapes and the adaptive potential of populations, revealing that these genetic factors facilitate reaching higher fitness peaks despite landscape ruggedness.

Contribution

It demonstrates using the NK model that epistasis and pleiotropy help populations adapt by enabling them to overcome rugged landscape valleys.

Findings

Populations utilize epistatic interactions and pleiotropy to reach higher fitness peaks.

Epistasis and pleiotropy do not inhibit adaptation despite rugged landscapes.

Genetic architecture influences the ability to cross fitness valleys.

Abstract

The factors that influence genetic architecture shape the structure of the fitness landscape, and therefore play a large role in the evolutionary dynamics. Here the NK model is used to investigate how epistasis and pleiotropy -- key components of genetic architecture -- affect the structure of the fitness landscape, and how they affect the ability of evolving populations to adapt despite the difficulty of crossing valleys present in rugged landscapes. Populations are seen to make use of epistatic interactions and pleiotropy to attain higher fitness, and are not inhibited by the fact that valleys have to be crossed to reach peaks of higher fitness.