Journal Article


Mario A Fares
Gary W Jones
Lorenzo Carretero-Paulet
Christina Toft
Orla M Keane



evolution genetic biological systems robustness gene duplication gene expression saccharomyces cerevisiae biology environmental conditions preservation

Preservation of genetic and regulatory robustness in ancient gene duplicates of Saccharomyces cerevisiae. (2014)

Abstract Biological systems remain robust against certain genetic and environmental challenges. Robustness allows the exploration of ecological adaptations. It is unclear what factors contribute to increasing robustness. Gene duplication has been considered to increase genetic robustness through functional redundancy, accelerating the evolution of novel functions. However, recent findings have questioned the link between duplication and robustness. In particular, it remains elusive whether ancient duplicates still bear potential for innovation through preserved redundancy and robustness. Here we have investigated this question by evolving the yeast Saccharomyces cerevisiae for 2200 generations under conditions allowing the accumulation of deleterious mutations, and we put mechanisms of mutational robustness to a test. S. cerevisiae declined in fitness along the evolution experiment, but this decline decelerated in later passages, suggesting functional compensation of mutated genes. We resequenced 28 genomes from experimentally evolved S. cerevisiae lines and found more mutations in duplicates--mainly small-scale duplicates--than in singletons. Genetically interacting duplicates evolved similarly and fixed more amino acid-replacing mutations than expected. Regulatory robustness of the duplicates was supported by a larger enrichment for mutations at the promoters of duplicates than at those of singletons. Analyses of yeast gene expression conditions showed a larger variation in the duplicates' expression than that of singletons under a range of stress conditions, sparking the idea that regulatory robustness allowed a wider range of phenotypic responses to environmental stresses, hence faster adaptations. Our data support the persistence of genetic and regulatory robustness in ancient duplicates and its role in adaptations to stresses.
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Full list of authors on original publication

Mario A Fares, Gary W Jones, Lorenzo Carretero-Paulet, Christina Toft, Orla M Keane

Experts in our system

Mario Ali Fares
Trinity College Dublin
Total Publications: 43
Gary W Jones
Maynooth University
Total Publications: 43
Christina Toft
Trinity College Dublin
Total Publications: 6