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BMC Evolutionary Biology

, 16:239

Theories and models


BackgroundGenetic canalization reflects the capacity of an organism’s phenotype to remain unchanged in spite of mutations. As selection on genetic canalization is weak and indirect, whether or not genetic canalization can reasonably evolve in complex genetic architectures is still an open question. In this paper, we use a quantitative model of gene regulatory network to describe the conditions in which substantial canalization is expected to emerge in a stable environment.

ResultsThrough an individual-based simulation framework, we confirmed that most parameters associated with the network topology complexity and size of the network have less influence than mutational parameters rate and size of mutations on the evolution of genetic canalization. We also established that selecting for extreme phenotypic optima nil or full gene expression leads to much higher canalization levels than selecting for intermediate expression levels. Overall, constrained networks evolve less canalization than networks in which some genes could evolve freely i.e. without direct stabilizing selection pressure on gene expression.

ConclusionsTaken together, these results lead us to propose a two-fold mechanism involved in the evolution of genetic canalization in gene regulatory networks: the shrinkage of mutational target useless genes are virtually removed from the network and redundancy in gene regulation so that some regulatory factors can be lost without affecting gene expression.

KeywordsGenetic architecture Quantitative genetics Individual-based simulations Evolution of epistasis Electronic supplementary materialThe online version of this article doi:10.1186-s12862-016-0801-2 contains supplementary material, which is available to authorized users.

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Autor: Estelle Rünneburger - Arnaud Le Rouzic

Fuente: https://link.springer.com/

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