Adaptive Prediction Emerges Over Short Evolutionary Time Scales

作者：de Lomana Adrian Lopez Garcia; Kaur Amardeep; Turkarslan Serdar; Beer Karlyn D; Mast Fred D; Smith Jennifer J; Aitchison John D; Baliga Nitin S

来源：Genome Biology and Evolution, 2017, 9(6): 1616-1623.

DOI：10.1093/gbe/evx116

• adaptive prediction
• structured environments
• conditioned fitness
• peroxisomal translocation
• variant analysis

Adaptive prediction is a capability of diverse organisms, including microbes, to sense a cue and prepare in advance to deal with a future environmental challenge. Here, we investigated the time frame over which adaptive prediction emerges when an organism encounters an environment with novel structure. We subjected yeast to laboratory evolution in a novel environment with repetitive, coupled exposures to a neutral chemical cue (caffeine), followed by a sublethal dose of a toxin (5-FOA), with an interspersed requirement for uracil prototrophy to counter-select mutants that gained constitutive 5-FOA resistance. We demonstrate the remarkable ability of yeast to internalize a novel environmental pattern within 50-150 generations by adaptively predicting 5-FOA stress upon sensing caffeine. We also demonstrate how novel environmental structure can be internalized by coupling two unrelated response networks, such as the response to caffeine and signaling-mediated conditional peroxisomal localization of proteins.

• 出版日期2017-6