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Analysis of the leaf metabolome in Arabidopsis thaliana mutation accumulation lines reveals association of metabolic disruption and fitness consequence. Evol Ecol 2022. [DOI: 10.1007/s10682-022-10210-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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2
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Intraspecific competitive interactions rapidly evolve via spontaneous mutations. Evol Ecol 2022. [DOI: 10.1007/s10682-022-10205-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Weng ML, Ågren J, Imbert E, Nottebrock H, Rutter MT, Fenster CB. Fitness effects of mutation in natural populations of Arabidopsis thaliana reveal a complex influence of local adaptation. Evolution 2020; 75:330-348. [PMID: 33340094 DOI: 10.1111/evo.14152] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 08/21/2020] [Accepted: 09/13/2020] [Indexed: 12/22/2022]
Abstract
Little is empirically known about the contribution of mutations to fitness in natural environments. However, Fisher's Geometric Model (FGM) provides a conceptual foundation to consider the influence of the environment on mutational effects. To quantify mutational properties in the field, we established eight sets of MA lines (7-10 generations) derived from eight founders collected from natural populations of Arabidopsis thaliana from French and Swedish sites, representing the range margins of the species in Europe. We reciprocally planted the MA lines and their founders at French and Swedish sites, allowing us to test predictions of FGM under naturally occurring environmental conditions. The performance of the MA lines relative to each other and to their respective founders confirmed some and contradicted other predictions of the FGM: the contribution of mutation to fitness variance increased when the genotype was in an environment where its fitness was low, that is, in the away environment, but mutations were more likely to be beneficial when the genotype was in its home environment. Consequently, environmental context plays a large role in the contribution of mutations to the evolutionary process and local adaptation does not guarantee that a genotype is at or close to its optimum.
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Affiliation(s)
- Mao-Lun Weng
- Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota, USA.,Current address: Department of Biology, Westfield State University, Westfield, Massachusettes, USA
| | - Jon Ågren
- Plant Ecology and Evolution, Department of Ecology and Genetics, EBC, Uppsala University, Uppsala, Sweden
| | - Eric Imbert
- Institut des Sciences de la Évolution, Centre National de la Recherche Scientifique, University of Montpellier, Montpellier, France
| | - Henning Nottebrock
- Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota, USA.,Current address: Plant Ecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Universitätsstrasse 30, Bayreuth, Germany
| | - Matthew T Rutter
- Department of Biology, College of Charleston, South Carolina, USA
| | - Charles B Fenster
- Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota, USA.,Oak Lake Field Station, South Dakota State University, Brookings, South Dakota, USA
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Jonas M, Navarro D. Induced mutations alter patterns of quantitative variation, phenotypic integration, and plasticity to elevated CO 2 in Arabidopsis thaliana. JOURNAL OF PLANT RESEARCH 2019; 132:33-47. [PMID: 30255212 DOI: 10.1007/s10265-018-1064-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 09/03/2018] [Indexed: 06/08/2023]
Abstract
A key step toward predicting responses to climate change is characterizing genetic variation in populations. While short-term responses will likely be shaped by currently available genetic variation, longer-term evolutionary responses will depend on the supply of novel variation by, ultimately, mutation. Studying mutational contributions to phenotypic variation can provide insights into the extent of potential variation on which selection may operate in future human-altered environments. Here we used the chemical mutagen ethyl methanesulfonate (EMS) to explore mutational contributions to phenotypic variation, integration, and plasticity to elevated carbon dioxide (eCO2) in three accessions of Arabidopsis thaliana. We found that (1) mutagenesis increased broad-sense heritabilities and variation in plasticity to eCO2 (genotype by environment interactions); (2) mutational effects varied among the three genetic backgrounds; (3) induced mutations had non-random (biased) effects on patterns of phenotypic integration. To our knowledge, this is the first study to address the effects of chemically induced mutations on phenotypic plasticity to eCO2 in a model plant. We discuss our results in light of emerging insights from theoretical and empirical quantitative genetics, suggest potential avenues of research, and identify approaches that may help advance our understanding of climate-driven evolution in plants.
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Affiliation(s)
- Mark Jonas
- Department of Biology, School of Natural and Social Sciences, State University of New York-Purchase College, 735 Anderson Hill Road, Purchase, NY, 10577, USA.
| | - Dania Navarro
- Department of Biology, School of Natural and Social Sciences, State University of New York-Purchase College, 735 Anderson Hill Road, Purchase, NY, 10577, USA
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Christy SF, Wernick RI, Lue MJ, Velasco G, Howe DK, Denver DR, Estes S. Adaptive Evolution under Extreme Genetic Drift in Oxidatively Stressed Caenorhabditis elegans. Genome Biol Evol 2018; 9:3008-3022. [PMID: 29069345 PMCID: PMC5714194 DOI: 10.1093/gbe/evx222] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/21/2017] [Indexed: 12/30/2022] Open
Abstract
A mutation-accumulation (MA) experiment with Caenorhabditis elegans nematodes was conducted in which replicate, independently evolving lines were initiated from a low-fitness mitochondrial electron transport chain mutant, gas-1. The original intent of the study was to assess the effect of electron transport chain dysfunction involving elevated reactive oxygen species production on patterns of spontaneous germline mutation. In contrast to results of standard MA experiments, gas-1 MA lines evolved slightly higher mean fitness alongside reduced among-line genetic variance compared with their ancestor. Likewise, the gas-1 MA lines experienced partial recovery to wildtype reactive oxygen species levels. Whole-genome sequencing and analysis revealed that the molecular spectrum but not the overall rate of nuclear DNA mutation differed from wildtype patterns. Further analysis revealed an enrichment of mutations in loci that occur in a gas-1-centric region of the C. elegans interactome, and could be classified into a small number of functional-genomic categories. Characterization of a backcrossed four-mutation set isolated from one gas-1 MA line revealed this combination to be beneficial on both gas-1 mutant and wildtype genetic backgrounds. Our combined results suggest that selection favoring beneficial mutations can be powerful even under unfavorable population genetic conditions, and agree with fitness landscape theory predicting an inverse relationship between population fitness and the likelihood of adaptation.
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Affiliation(s)
| | | | | | | | - Dana K Howe
- Department of Integrative Biology, Oregon State University
| | - Dee R Denver
- Department of Integrative Biology, Oregon State University
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Luijckx P, Ho EKH, Stanić A, Agrawal AF. Mutation accumulation in populations of varying size: large effect mutations cause most mutational decline in the rotifer Brachionus calyciflorus under UV-C radiation. J Evol Biol 2018; 31:924-932. [PMID: 29672987 DOI: 10.1111/jeb.13282] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 02/19/2018] [Accepted: 04/06/2018] [Indexed: 12/22/2022]
Abstract
Theory predicts that fitness decline via mutation accumulation will depend on population size, but there are only a few direct tests of this key idea. To gain a qualitative understanding of the fitness effect of new mutations, we performed a mutation accumulation experiment with the facultative sexual rotifer Brachionus calyciflorus at six different population sizes under UV-C radiation. Lifetime reproduction assays conducted after ten and sixteen UV-C radiations showed that while small populations lost fitness, fitness losses diminished rapidly with increasing population size. Populations kept as low as 10 individuals were able to maintain fitness close to the nonmutagenized populations throughout the experiment indicating that selection was able to remove the majority of large effect mutations in small populations. Although our results also seem to imply that small populations are effectively immune to mutational decay, we caution against this interpretation. Given sufficient time, populations of moderate to large size can experience declines in fitness from accumulating weakly deleterious mutations as demonstrated by fitness estimates from simulations and, tentatively, from a long-term experiment with populations of moderate size. There is mounting evidence to suggest that mutational distributions contain a heavier tail of large effects. Our results suggest that this is also true when the mutational spectrum is altered by UV radiation.
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Affiliation(s)
- Pepijn Luijckx
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.,Zoology, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland
| | - Eddie K H Ho
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada
| | - Andrijana Stanić
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada
| | - Aneil F Agrawal
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada
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McGuigan K, Aw E. How does mutation affect the distribution of phenotypes? Evolution 2017; 71:2445-2456. [PMID: 28884791 DOI: 10.1111/evo.13358] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 08/27/2017] [Accepted: 08/29/2017] [Indexed: 12/14/2022]
Abstract
The potential for mutational processes to influence patterns of neutral or adaptive phenotypic evolution is not well understood. If mutations are directionally biased, shifting trait means in a particular direction, or if mutation generates more variance in some directions of multivariate trait space than others, mutation itself might be a source of bias in phenotypic evolution. Here, we use mutagenesis to investigate the affect of mutation on trait mean and (co)variances in zebrafish, Danio rerio. Mutation altered the relationship between age and both prolonged swimming speed and body shape. These observations suggest that mutational effects on ontogeny or aging have the potential to generate variance across the phenome. Mutations had a far greater effect in males than females, although whether this is a reflection of sex-specific ontogeny or aging remains to be determined. In males, mutations generated positive covariance between swimming speed, size, and body shape suggesting the potential for mutation to affect the evolutionary covariation of these traits. Overall, our observations suggest that mutation does not generate equal variance in all directions of phenotypic space or in each sex, and that pervasive variation in ontogeny or aging within a cohort could affect the variation available to evolution.
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Affiliation(s)
- Katrina McGuigan
- School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072
| | - Ernest Aw
- School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072
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Stearns FW, Fenster CB. The effect of induced mutations on quantitative traits in Arabidopsis thaliana: Natural versus artificial conditions. Ecol Evol 2016; 6:8366-8374. [PMID: 28031789 PMCID: PMC5167040 DOI: 10.1002/ece3.2558] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 09/09/2016] [Accepted: 09/15/2016] [Indexed: 12/04/2022] Open
Abstract
Mutations are the ultimate source of all genetic variations. New mutations are expected to affect quantitative traits differently depending on the extent to which traits contribute to fitness and the environment in which they are tested. The dogma is that the preponderance of mutations affecting fitness will be skewed toward deleterious while their effects on nonfitness traits will be bidirectionally distributed. There are mixed views on the role of stress in modulating these effects. We quantify mutation effects by inducing mutations in Arabidopsis thaliana (Columbia accession) using the chemical ethylmethane sulfonate. We measured the effects of new mutations relative to a premutation founder for fitness components under both natural (field) and artificial (growth room) conditions. Additionally, we measured three other quantitative traits, not expected to contribute directly to fitness, under artificial conditions. We found that induced mutations were equally as likely to increase as decrease a trait when that trait was not closely related to fitness (traits that were neither survivorship nor reproduction). We also found that new mutations were more likely to decrease fitness or fitness‐related traits under more stressful field conditions than under relatively benign artificial conditions. In the benign condition, the effect of new mutations on fitness components was similar to traits not as closely related to fitness. These results highlight the importance of measuring the effects of new mutations on fitness and other traits under a range of conditions.
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Affiliation(s)
- Frank W Stearns
- Department of Biology Biology-Psychology Building University of Maryland College Park MD USA
| | - Charles B Fenster
- Department of Biology Biology-Psychology Building University of Maryland College Park MD USA
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