Microbial evolution. Global epistasis makes adaptation predictable despite sequence-level stochasticity.
Microbial evolution. Global epistasis makes adaptation predictable despite sequence-level stochasticity.
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DOI:
10.1126/science.1250939
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发表时间:
2014-06-27
期刊:
影响因子:
--
通讯作者:
Desai MM
中科院分区:
文献类型:
--
作者:
Kryazhimskiy S;Rice DP;Jerison ER;Desai MM
Epistatic interactions between mutations can make evolutionary trajectories contingent on the chance occurrence of initial mutations. We used experimental evolution in Saccharomyces cerevisiae to quantify this contingency, finding differences in adaptability between 64 closely related genotypes. Despite these differences, sequencing of 104 evolved clones showed that initial genotype did not constrain future mutational trajectories. Instead, reconstructed combinations of mutations revealed a pattern of diminishing returns epistasis: beneficial mutations have consistently smaller effects in fitter backgrounds. Taken together, these results show that beneficial mutations affecting a variety of biological processes are globally coupled: they interact strongly, but only through their combined effect on fitness. As a consequence, fitness evolution follows a predictable trajectory even though sequence-level adaptation is stochastic.
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