Evolution of recombination among multiple selected loci: a generalized reduction principle

Area of Science:

• Evolutionary genetics
• Population genetics
• Molecular evolution

Background:

• Recombination patterns significantly influence genetic variation and evolution.
• Understanding the dynamics of genetic modifiers is crucial for evolutionary studies.
• Epistasis, gene interactions, can complicate simple models of selection.

Purpose of the Study:

• To determine the conditions under which a novel allele controlling recombination patterns can successfully invade a population.
• To investigate the role of viability selection and epistasis in the spread of recombination modifiers.
• To analyze how changes in pairwise recombination rates affect the invasion potential of a modifier allele.

Main Methods:

• Mathematical modeling of population genetics.
• Analysis of allele invasion criteria based on fitness.
• Investigation of selection under weak additive-by-additive epistasis.
• Examination of recombination patterns including interference.

Main Results:

• An allele increases if its averaged marginal fitness exceeds the prior mean fitness.
• Under specific epistatic selection, invasion depends on a weighted average of changes in pairwise recombination rates.
• Modifier alleles can succeed with an overall reduction in recombination, despite increasing it in some gene pairs.

Conclusions:

• The spread of recombination modifiers is contingent on their net effect on recombination rates and fitness.
• Epistatic interactions play a significant role in modulating the evolutionary success of recombination modifiers.
• This research provides insights into the evolution of genome architecture and genetic linkage.