Publication Date:
2014-06-28
Description:
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 among 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.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4314286/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4314286/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kryazhimskiy, Sergey -- Rice, Daniel P -- Jerison, Elizabeth R -- Desai, Michael M -- GM104239/GM/NIGMS NIH HHS/ -- R01 GM104239/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Jun 27;344(6191):1519-22. doi: 10.1126/science.1250939.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA. skryazhi@oeb.harvard.edu mdesai@oeb.harvard.edu. ; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA. ; Department of Physics, Harvard University, Cambridge, MA 02138, USA. FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA. ; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. Department of Physics, Harvard University, Cambridge, MA 02138, USA. FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA. skryazhi@oeb.harvard.edu mdesai@oeb.harvard.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24970088" target="_blank"〉PubMed〈/a〉
Keywords:
*Adaptation, Physiological
;
Base Sequence
;
Directed Molecular Evolution
;
*Epistasis, Genetic
;
*Evolution, Molecular
;
Genes, Fungal
;
*Genetic Fitness
;
Genome, Fungal
;
Genotype
;
Models, Genetic
;
Molecular Sequence Annotation
;
Mutation
;
Saccharomyces cerevisiae/*genetics/*physiology
;
Sequence Analysis, DNA
;
Stochastic Processes
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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