Interaction-based evolution: how natural selection and nonrandom mutation worktogether

Biology Direct

Adi Livnat¹ 

[1] Department of Biological Sciences, Virginia Tech, Blacksburg, VA, 24061,USA

关键词: Evolvability;    Mutation bias;    Transcriptional promiscuity;    de novo genes;    Junk DNA;    Epistasis;    Sex and recombination;    Neutral theory;    Adaptive evolution;   

Others  :  793322
DOI  :  10.1186/1745-6150-8-24

 received in 2013-04-25, accepted in 2013-09-26,  发布年份 2013

【 摘 要 】

Background

The modern evolutionary synthesis leaves unresolved some of the most fundamental, long-standing questions in evolutionary biology What is the role of sex in evolution? How does complex adaptation evolve? How can selection operate effectively on genetic interactions? More recently, the molecular biology and genomics revolutions have raised a host of critical new questions, through empirical findings that the modern synthesis fails to explain for example, the discovery of de novo genes; the immense constructive role of transposable elements in evolution; genetic variance and biochemical activity that go far beyond what traditional natural selection can maintain; perplexing cases of molecular parallelism; and more.

Presentation of the hypothesis

Here I address these questions from a unified perspective, by means of a new mechanistic view of evolution that offers a novel connection between selection on the phenotype and genetic evolutionary change (while relying, like the traditional theory, on natural selection as the only source of feedback on the fit between an organism and its environment). I hypothesize that the mutation that is of relevance for the evolution of complex adaptation—while not Lamarckian, or “directed” to increase fitness—is not random, but is instead the outcome of a complex and continually evolving biological process that combines information from multiple loci into one. This allows selection on a fleeting combination of interacting alleles at different loci to have a hereditary effect according to the combination’s fitness.

Testing and implications of the hypothesis

This proposed mechanism addresses the problem of how beneficial genetic interactions can evolve under selection, and also offers an intuitive explanation for the role of sex in evolution, which focuses on sex as the generator of genetic combinations. Importantly, it also implies that genetic variation that has appeared neutral through the lens of traditional theory can actually experience selection on interactions and thus has a much greater adaptive potential than previously considered. Empirical evidence for the proposed mechanism from both molecular evolution and evolution at the organismal level is discussed, and multiple predictions are offered by which it may be tested.

Reviewers

This article was reviewed by Nigel Goldenfeld (nominated by Eugene V. Koonin), Jürgen Brosius and W. Ford Doolittle.

【 授权许可】

   
2013 Livnat; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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