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Medientyp:
E-Artikel
Titel:
Hitchhiking and epistasis give rise to cohort dynamics in adapting populations
Beteiligte:
Buskirk, Sean W.;
Peace, Ryan Emily;
Lang, Gregory I.
Erschienen:
Proceedings of the National Academy of Sciences, 2017
Erschienen in:Proceedings of the National Academy of Sciences
Sprache:
Englisch
DOI:
10.1073/pnas.1702314114
ISSN:
0027-8424;
1091-6490
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Significance</jats:title>
<jats:p>Mutations are the raw material for evolution. However, complex evolutionary dynamics make it challenging to identify which mutations drive adaptation. During adaptation in asexual populations, multiple mutations move synchronously through the population as mutational cohorts. Here we quantify the fitness effect of 116 mutations from 11 laboratory-evolved yeast populations. We show that only a fraction of genome evolution is strongly adaptive. We map driver and hitchhiker mutations to 31 mutational cohorts, and we identify 1 cohort in which mutations combine to provide a fitness benefit greater than the sum of their individual effects. Our analysis uncovers the roles of genetic hitchhiking and epistasis in determining which mutations ultimately succeed or fail in the context of a rapidly evolving microbial population.</jats:p>