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Shared Molecular Targets Confer Resistance over Short and Long Evolutionary Timescales.
- Source :
- Molecular Biology & Evolution; Apr2019, Vol. 36 Issue 4, p691-708, 18p
- Publication Year :
- 2019
-
Abstract
- Pre-existing and de novo genetic variants can both drive adaptation to environmental changes, but their relative contributions and interplay remain poorly understood. Here we investigated the evolutionary dynamics in drug-treated yeast populations with different levels of pre-existing variation by experimental evolution coupled with time-resolved sequencing and phenotyping. We found a doubling of pre-existing variation alone boosts the adaptation by 64.1% and 51.5% in hydroxyurea and rapamycin, respectively. The causative pre-existing and de novo variants were selected on shared targets: RNR4 in hydroxyurea and TOR1, TOR2 in rapamycin. Interestingly, the pre-existing and de novo TOR variants map to different functional domains and act via distinct mechanisms. The pre-existing TOR variants from two domesticated strains exhibited opposite rapamycin resistance effects, reflecting lineage-specific functional divergence. This study provides a dynamic view on how pre-existing and de novo variants interactively drive adaptation and deepens our understanding of clonally evolving populations. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07374038
- Volume :
- 36
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Molecular Biology & Evolution
- Publication Type :
- Academic Journal
- Accession number :
- 135718869
- Full Text :
- https://doi.org/10.1093/molbev/msz006