Shifting fitness landscapes in response to altered environments.

Shifting fitness landscapes in response to altered environments.
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DOI:
10.1111/evo.12207
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发表时间:
2013-12
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Bolon DNA
Bolon DNA
中科院分区:
其他
文献类型:
--
作者:
Hietpas RT;Bank C;Jensen JD;Bolon DNA

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The role of adaptation in molecular evolution has been contentious for decades. Here, we shed light on the adaptive potential in Saccharomyces cerevisiae by presenting systematic fitness measurements for all possible point mutations in a region of Hsp90 under four environmental conditions. Under elevated salinity, we observe numerous beneficial mutations with growth advantages up to 7% relative to the wild type. All of these beneficial mutations were observed to be associated with high costs of adaptation. We thus demonstrate that an essential protein can harbor adaptive potential upon an environmental challenge, and report a remarkable fit of the data to a version of Fisher's geometric model that focuses on the fitness trade-offs between mutations in different environments.
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