Fitness effects of spontaneous mutations in picoeukaryotic marine green algae

Krasovec, Marc, Eyre-Walker, Adam, Grimsley, Nigel, Salmeron, Christophe, Pecqueur, David, Piganeau, Gwenael and Sanchez-Ferandin, Sophie (2016) Fitness effects of spontaneous mutations in picoeukaryotic marine green algae. G3, 6 (7). pp. 2063-2071. ISSN 2160-1836

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Abstract

Estimates of the fitness effects of spontaneous mutations are important for understanding the adaptive potential of species. Here, we present the results of mutation accumulation experiments over 265– 512 sequential generations in four species of marine unicellular green algae, Ostreococcus tauri RCC4221, Ostreococcus mediterraneus RCC2590, Micromonas pusilla RCC299, and Bathycoccus prasinos RCC1105. Cell division rates, taken as a proxy for fitness, systematically decline over the course of the experiment in O. tauri, but not in the three other species where the MA experiments were carried out over a smaller number of generations. However, evidence of mutation accumulation in 24 MA lines arises when they are exposed to stressful conditions, such as changes in osmolarity or exposure to herbicides. The selection coefficients, estimated from the number of cell divisions/day, varies significantly between the different environmental conditions tested in MA lines, providing evidence for advantageous and deleterious effects of spontaneous mutations. This suggests a common environmental dependence of the fitness effects of mutations and allows the minimum mutation/genome/generation rates to be inferred at 0.0037 in these species.

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science > QH Natural history > QH0301 Biology > QH0359 Evolution
Q Science > QH Natural history > QH0301 Biology > QH0426 Genetics
Depositing User: Adam Eyre-Walker
Date Deposited: 23 Nov 2017 11:16
Last Modified: 23 Nov 2017 11:17
URI: http://sro.sussex.ac.uk/id/eprint/71509

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