期刊
NATURE
卷 519, 期 7542, 页码 181-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature14279
关键词
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资金
- NIH [R01 HG003328, 5-T32-HG-44-17, R25 GM067110]
- NSF [DMS-1120699, PHY-1305433]
- Stanford University [Bio-X IIP6-63]
- Betty Moore Foundation [2919]
- Louis and Beatrice Laufer Center
- Direct For Mathematical & Physical Scien
- Division Of Physics [1305433] Funding Source: National Science Foundation
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1120699] Funding Source: National Science Foundation
Evolution of large asexual cell populations underlies similar to 30% of deaths worldwide, including those caused by bacteria, fungi, parasites, and cancer. However, the dynamics underlying these evolutionary processes remain poorly understood because they involve many competing beneficial lineages, most of which never rise above extremely low frequencies in the population. To observe these normally hidden evolutionary dynamics, we constructed a sequencing-based ultra high-resolution lineage tracking system in Saccharomyces cerevisiae that allowed us to monitor the relative frequencies of similar to 500,000 lineages simultaneously. In contrast to some expectations, we found that the spectrum of fitness effects of beneficial mutations is neither exponential nor monotonic. Early adaptation is a predictable consequence of this spectrum and is strikingly reproducible, but the initial small-effect mutations are soon outcompeted by rarer large-effect mutations that result in variability between replicates. These results suggest that early evolutionary dynamics may be deterministic for a period of time before stochastic effects become important.
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