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Shahmohamadloo RS, Fryxell JM, Rudman SM. Transgenerational epigenetic inheritance increases trait variation but is not adaptive. bioRxiv 2024:2024.04.15.589575. [PMID: 38659883 PMCID: PMC11042258 DOI: 10.1101/2024.04.15.589575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
Understanding processes that can produce adaptive phenotypic shifts in response to rapid environmental change is critical to reducing biodiversity loss. The ubiquity of environmentally induced epigenetic marks has led to speculation that epigenetic inheritance could potentially enhance population persistence in response to environmental change. Yet, the magnitude and fitness consequences of epigenetic marks carried beyond maternal inheritance are largely unknown. Here, we tested how transgenerational epigenetic inheritance (TEI) shapes the phenotypic response of Daphnia clones to the environmental stressor Microcystis. We split individuals from each of eight genotypes into exposure and control treatments (F0 generation) and tracked the fitness of their descendants to the F3 generation. We found transgenerational epigenetic exposure to Microcystis led to reduced rates of survival and individual growth and no consistent effect on offspring production. Increase in trait variance in the F3 relative to F0 generations suggests potential for heritable bet hedging driven by TEI, which could impact population dynamics. Our findings are counter to the working hypothesis that TEI is a generally adaptive mechanism likely to prevent extinction for populations inhabiting rapidly changing environments.
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Affiliation(s)
- René S. Shahmohamadloo
- School of Biological Sciences, Washington State University, Vancouver, WA, United States
| | - John M. Fryxell
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Seth M. Rudman
- School of Biological Sciences, Washington State University, Vancouver, WA, United States
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2
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Shahmohamadloo RS, Rudman SM, Clare CI, Westrick JA, Wang X, De Meester L, Fryxell JM. Intraspecific genetic variation is critical to robust toxicological predictions of aquatic contaminants. bioRxiv 2023:2023.06.06.543817. [PMID: 37333160 PMCID: PMC10274664 DOI: 10.1101/2023.06.06.543817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Environmental risk assessment is a critical tool for protecting aquatic life and its effectiveness is predicated on predicting how natural populations respond to contaminants. Yet, routine toxicity testing typically examines only one genotype, which may render risk assessments inaccurate as populations are most often composed of genetically distinct individuals. To determine the importance of intraspecific variation in the translation of toxicity testing to populations, we quantified the magnitude of genetic variation within 20 Daphnia magna clones derived from one lake using whole genome sequencing and phenotypic assays. We repeated these assays across two exposure levels of microcystins, a cosmopolitan and lethal aquatic contaminant produced by harmful algal blooms. We found considerable intraspecific genetic variation in survival, growth, and reproduction, which was amplified by microcystins exposure. Finally, using simulations we demonstrate that the common practice of employing a single genotype to calculate toxicity tolerance failed to produce an estimate within the 95% confidence interval over half of the time. These results illuminate the importance of incorporating intraspecific genetic variation into toxicity testing to reliably predict how natural populations will respond to aquatic contaminants.
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Affiliation(s)
- René S. Shahmohamadloo
- School of Biological Sciences, Washington State University, Vancouver, Washington, 98686, United States
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Seth M. Rudman
- School of Biological Sciences, Washington State University, Vancouver, Washington, 98686, United States
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Catherine I. Clare
- School of Biological Sciences, Washington State University, Vancouver, Washington, 98686, United States
| | - Judy A. Westrick
- Department of Chemistry, Wayne State University, Detroit, Michigan, 48202, United States
| | - Xueqi Wang
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Luc De Meester
- Laboratory of Aquatic Ecology, Evolution, and Conservation, University of Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium
| | - John M. Fryxell
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
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3
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Shahmohamadloo RS, Bhavsar SP, Ortiz Almirall X, Marklevitz SAC, Rudman SM, Sibley PK. Cyanotoxins accumulate in Lake St. Clair fish yet their fillets are safe to eat. Sci Total Environ 2023; 874:162381. [PMID: 36870491 DOI: 10.1016/j.scitotenv.2023.162381] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 06/18/2023]
Abstract
Consuming fish exposed to cyanobacterial harmful algal blooms (HABs) may be a major route of microcystin toxin exposure to humans. However, it remains unknown whether fish can accumulate and retain microcystins temporally in waterbodies with recurring seasonal HABs, particularly before and after a HAB event when fishing is active. We conducted a field study on Largemouth Bass, Northern Pike, Smallmouth Bass, Rock Bass, Walleye, White Bass, and Yellow Perch to assess the human health risks to microcystin toxicity via fish consumption. We collected 124 fish in 2016 and 2018 from Lake St. Clair, a large freshwater ecosystem in the North American Great Lakes that is actively fished pre- and post-HAB periods. Muscles were analyzed using the 2-methyl-3-methoxy-4-phenylbutyric acid (MMPB) Lemieux Oxidation method for total microcystins, which was used to perform a human health risk assessment for comparison against fish consumption advisory benchmarks available for Lake St. Clair. From this collection 35 fish livers were additionally extracted to confirm the presence of microcystins. Microcystins were detected in all livers at widely varying concentrations (1-1500 ng g-1 ww), suggesting HABs are an underappreciated and pervasive stressor to fish populations. Conversely, microcystin levels were consistently low in muscles (0-15 ng g-1 ww) and presented negligible risk, empirically supporting that fillets may be safely consumed before and after HAB events following fish consumption advisories.
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Affiliation(s)
- René S Shahmohamadloo
- School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, United States; School of Environmental Sciences, University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada.
| | - Satyendra P Bhavsar
- Ministry of the Environment, Conservation and Parks, 125 Resources Rd, Toronto, ON M9P 3V6, Canada; Department of Physical & Environmental Sciences, University of Toronto, 1065 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Xavier Ortiz Almirall
- Ministry of the Environment, Conservation and Parks, 125 Resources Rd, Toronto, ON M9P 3V6, Canada; IQS School of Engineering, Universitat Ramon Llull, Via Augusta, 390, 08017 Barcelona, Spain
| | - Stephen A C Marklevitz
- Lake Erie Management Unit, Ministry of Natural Resources and Forestry, 320 Milo Road, Wheatley, ON N0P 2P0, Canada
| | - Seth M Rudman
- School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, United States
| | - Paul K Sibley
- School of Environmental Sciences, University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada
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4
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Shahmohamadloo RS, Bhavsar SP, Ortiz Almirall X, Marklevitz SAC, Rudman SM, Sibley PK. Lake Erie fish safe to eat yet afflicted by algal hepatotoxins. Sci Total Environ 2023; 861:160474. [PMID: 36481113 DOI: 10.1016/j.scitotenv.2022.160474] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 10/28/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Toxic harmful algal blooms (HABs) pose serious threats to human health and instances of wildlife death have been documented across taxa. However, the extent of toxicological impacts on wildlife species is largely unresolved, raising uncertainty about the repercussions of increasingly severe HABs on the biodiversity and functioning of aquatic ecosystems. Here, we conducted a field study to assess human health risks from consuming fish caught across all stages of a HAB and to determine the pervasiveness of potentially harmful levels of the cosmopolitan toxin microcystin on fish populations. We collected 190 fish in 2015 and 2017 from Lake Erie, a large freshwater ecosystem that is highly productive for fisheries and is an epicenter of HABs and microcystin toxicity events. Fish muscles and livers were analyzed for total microcystins, which was used to conduct a human health risk assessment for comparison against fish consumption advisory benchmarks available for Lake Erie. We found microcystins pose low risks to human health from fillet consumption (mean 1.80 ng g-1 ww) but substantial risks to fish health and recruitment from liver concentrations measured well before and after seasonal bloom events (mean 460.13 ng g-1 ww). Our findings indicate HABs are a previously underappreciated but pervasive threat to fish populations.
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Affiliation(s)
- René S Shahmohamadloo
- School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, United States; School of Environmental Sciences, University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada.
| | - Satyendra P Bhavsar
- Environmental Monitoring and Reporting Branch, Ontario Ministry of the Environment, Conservation and Parks, 125 Resources Rd, Toronto, ON M9P 3V6, Canada; Department of Physical & Environmental Sciences, University of Toronto, 1065 Military Trail, Toronto, ON M1C 1A4, Canada
| | - Xavier Ortiz Almirall
- Environmental Monitoring and Reporting Branch, Ontario Ministry of the Environment, Conservation and Parks, 125 Resources Rd, Toronto, ON M9P 3V6, Canada; IQS School of Engineering, Universitat Ramon Llull, Via Augusta, 390, 08017 Barcelona, Spain
| | - Stephen A C Marklevitz
- Lake Erie Management Unit, Ontario Ministry of Natural Resources and Forestry, 320 Milo Road, Wheatley, ON N0P 2P0, Canada
| | - Seth M Rudman
- School of Biological Sciences, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, WA 98686, United States
| | - Paul K Sibley
- School of Environmental Sciences, University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada
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5
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Rudman SM, Greenblum SI, Rajpurohit S, Betancourt NJ, Hanna J, Tilk S, Yokoyama T, Petrov DA, Schmidt P. Direct observation of adaptive tracking on ecological time scales in Drosophila. Science 2022; 375:eabj7484. [PMID: 35298245 PMCID: PMC10684103 DOI: 10.1126/science.abj7484] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Direct observation of evolution in response to natural environmental change can resolve fundamental questions about adaptation, including its pace, temporal dynamics, and underlying phenotypic and genomic architecture. We tracked the evolution of fitness-associated phenotypes and allele frequencies genome-wide in 10 replicate field populations of Drosophila melanogaster over 10 generations from summer to late fall. Adaptation was evident over each sampling interval (one to four generations), with exceptionally rapid phenotypic adaptation and large allele frequency shifts at many independent loci. The direction and basis of the adaptive response shifted repeatedly over time, consistent with the action of strong and rapidly fluctuating selection. Overall, we found clear phenotypic and genomic evidence of adaptive tracking occurring contemporaneously with environmental change, thus demonstrating the temporally dynamic nature of adaptation.
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Affiliation(s)
- Seth M. Rudman
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
- School of Biological Sciences, Washington State University, Vancouver, WA 98686, USA
| | - Sharon I. Greenblum
- Department of Biology, Stanford University, Stanford, CA 94305, USA
- Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Subhash Rajpurohit
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
- Department of Biological and Life Sciences, Ahmedabad University, Ahmedabad 380009, GJ, India
| | | | - Jinjoo Hanna
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Susanne Tilk
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Tuya Yokoyama
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Dmitri A. Petrov
- Department of Biology, Stanford University, Stanford, CA 94305, USA
| | - Paul Schmidt
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
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6
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Abstract
Eco-evolutionary dynamics will play a critical role in determining species' fates as climatic conditions change. Unfortunately, we have little understanding of how rapid evolutionary responses to climate play out when species are embedded in the competitive communities that they inhabit in nature. We tested the effects of rapid evolution in response to interspecific competition on subsequent ecological and evolutionary trajectories in a seasonally changing climate using a field-based evolution experiment with Drosophila melanogaster Populations of D. melanogaster were either exposed, or not exposed, to interspecific competition with an invasive competitor, Zaprionus indianus, over the summer. We then quantified these populations' ecological trajectories (abundances) and evolutionary trajectories (heritable phenotypic change) when exposed to a cooling fall climate. We found that competition with Z. indianus in the summer affected the subsequent evolutionary trajectory of D. melanogaster populations in the fall, after all interspecific competition had ceased. Specifically, flies with a history of interspecific competition evolved under fall conditions to be larger and have lower cold fecundity and faster development than flies without a history of interspecific competition. Surprisingly, this divergent fall evolutionary trajectory occurred in the absence of any detectible effect of the summer competitive environment on phenotypic evolution over the summer or population dynamics in the fall. This study demonstrates that competitive interactions can leave a legacy that shapes evolutionary responses to climate even after competition has ceased, and more broadly, that evolution in response to one selective pressure can fundamentally alter evolution in response to subsequent agents of selection.
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Affiliation(s)
- Tess Nahanni Grainger
- Ecology and Evolutionary Biology Department, Princeton University, Princeton NJ 08544;
| | - Seth M Rudman
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104
- School of Biological Sciences, Washington State University, Vancouver, WA 98686
| | - Paul Schmidt
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104
| | - Jonathan M Levine
- Ecology and Evolutionary Biology Department, Princeton University, Princeton NJ 08544
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Walters AW, Hughes RC, Call TB, Walker CJ, Wilcox H, Petersen SC, Rudman SM, Newell PD, Douglas AE, Schmidt PS, Chaston JM. The microbiota influences the Drosophila melanogaster life history strategy. Mol Ecol 2020; 29:639-653. [PMID: 31863671 DOI: 10.1111/mec.15344] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 12/03/2019] [Accepted: 12/16/2019] [Indexed: 12/17/2022]
Abstract
Organisms are locally adapted when members of a population have a fitness advantage in one location relative to conspecifics in other geographies. For example, across latitudinal gradients, some organisms may trade off between traits that maximize fitness components in one, but not both, of somatic maintenance or reproductive output. Latitudinal gradients in life history strategies are traditionally attributed to environmental selection on an animal's genotype, without any consideration of the possible impact of associated microorganisms ("microbiota") on life history traits. Here, we show in Drosophila melanogaster, a key model for studying local adaptation and life history strategy, that excluding the microbiota from definitions of local adaptation is a major shortfall. First, we reveal that an isogenic fly line reared with different bacteria varies the investment in early reproduction versus somatic maintenance. Next, we show that in wild fruit flies, the abundance of these same bacteria was correlated with the latitude and life history strategy of the flies, suggesting geographic specificity of the microbiota composition. Variation in microbiota composition of locally adapted D. melanogaster could be attributed to both the wild environment and host genetic selection. Finally, by eliminating or manipulating the microbiota of fly lines collected across a latitudinal gradient, we reveal that host genotype contributes to latitude-specific life history traits independent of the microbiota and that variation in the microbiota can suppress or reverse the differences between locally adapted fly lines. Together, these findings establish the microbiota composition of a model animal as an essential consideration in local adaptation.
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Affiliation(s)
- Amber W Walters
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Rachel C Hughes
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Tanner B Call
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Carson J Walker
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Hailey Wilcox
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Samara C Petersen
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Seth M Rudman
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | - Peter D Newell
- Department of Biological Sciences, SUNY Oswego, Oswego, NY, USA
| | - Angela E Douglas
- Department of Entomology and Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
| | - Paul S Schmidt
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | - John M Chaston
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
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8
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Rennison DJ, Rudman SM, Schluter D. Parallel changes in gut microbiome composition and function during colonization, local adaptation and ecological speciation. Proc Biol Sci 2019; 286:20191911. [PMID: 31795865 DOI: 10.1098/rspb.2019.1911] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The processes of local adaptation and ecological speciation are often strongly shaped by biotic interactions such as competition and predation. One of the strongest lines of evidence that biotic interactions drive evolution comes from the repeated divergence of lineages in association with repeated changes in the community of interacting species. Yet relatively little is known about the repeatability of changes in gut microbial communities and their role in adaptation and divergence of host populations in nature. Here we use three cases of rapid, parallel adaptation and speciation in freshwater threespine stickleback to test for parallel changes in associated gut microbiomes. We find that features of the gut microbial communities have shifted repeatedly in the same direction in association with parallel divergence and speciation of stickleback hosts. These results suggest that changes to gut microbiomes can occur rapidly and predictably in conjunction with host evolution, and that host-microbe interactions might play an important role in host adaptation and diversification.
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Affiliation(s)
- Diana J Rennison
- Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
| | - Seth M Rudman
- Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
| | - Dolph Schluter
- Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
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Rudman SM, Greenblum S, Hughes RC, Rajpurohit S, Kiratli O, Lowder DB, Lemmon SG, Petrov DA, Chaston JM, Schmidt P. Microbiome composition shapes rapid genomic adaptation of Drosophila melanogaster. Proc Natl Acad Sci U S A 2019; 116:20025-20032. [PMID: 31527278 PMCID: PMC6778213 DOI: 10.1073/pnas.1907787116] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Population genomic data has revealed patterns of genetic variation associated with adaptation in many taxa. Yet understanding the adaptive process that drives such patterns is challenging; it requires disentangling the ecological agents of selection, determining the relevant timescales over which evolution occurs, and elucidating the genetic architecture of adaptation. Doing so for the adaptation of hosts to their microbiome is of particular interest with growing recognition of the importance and complexity of host-microbe interactions. Here, we track the pace and genomic architecture of adaptation to an experimental microbiome manipulation in replicate populations of Drosophila melanogaster in field mesocosms. Shifts in microbiome composition altered population dynamics and led to divergence between treatments in allele frequencies, with regions showing strong divergence found on all chromosomes. Moreover, at divergent loci previously associated with adaptation across natural populations, we found that the more common allele in fly populations experimentally enriched for a certain microbial group was also more common in natural populations with high relative abundance of that microbial group. These results suggest that microbiomes may be an agent of selection that shapes the pattern and process of adaptation and, more broadly, that variation in a single ecological factor within a complex environment can drive rapid, polygenic adaptation over short timescales.
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Affiliation(s)
- Seth M Rudman
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104;
| | | | - Rachel C Hughes
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602
| | - Subhash Rajpurohit
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104
| | - Ozan Kiratli
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104
| | - Dallin B Lowder
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602
| | - Skyler G Lemmon
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602
| | - Dmitri A Petrov
- Department of Biology, Stanford University, Stanford, CA 94305
| | - John M Chaston
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602
| | - Paul Schmidt
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104
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10
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Lemmen KD, Butler OM, Koffel T, Rudman SM, Symons CC. Stoichiometric Traits Vary Widely Within Species: A Meta-Analysis of Common Garden Experiments. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00339] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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11
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Rennison DJ, Rudman SM, Schluter D. Genetics of adaptation: Experimental test of a biotic mechanism driving divergence in traits and genes. Evol Lett 2019; 3:513-520. [PMID: 31636943 PMCID: PMC6791182 DOI: 10.1002/evl3.135] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 07/25/2019] [Accepted: 08/07/2019] [Indexed: 11/07/2022] Open
Abstract
The genes underlying adaptations are becoming known, yet the causes of selection on genes-a key step in the study of the genetics of adaptation-remains uncertain. We address this issue experimentally in a threespine stickleback species pair showing exaggerated divergence in bony defensive armor in association with competition-driven character displacement. We used semi-natural ponds to test the role of a native predator in causing divergent evolution of armor and two known underlying genes. Predator presence/absence altered selection on dorsal spines and allele frequencies at the Msx2a gene across a generation. Evolutionary trajectories of alleles at a second gene, Pitx1, and the pelvic spine trait it controls, were more variable. Our experiment demonstrates how manipulation of putative selective agents helps to identify causes of evolutionary divergence at key genes, rule out phenotypic plasticity as a sole determinant of phenotypic differences, and eliminate reliance on fitness surrogates. Divergence of predation regimes in sympatric stickleback is associated with coevolution in response to resource competition, implying a cascade of biotic interactions driving species divergence. We suggest that as divergence proceeds, an increasing number of biotic interactions generate divergent selection, causing more evolution in turn. In this way, biotic adaptation perpetuates species divergence through time during adaptive radiation in an expanding number of traits and genes.
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Affiliation(s)
- Diana J. Rennison
- Department of Zoology and Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
- Institute of Ecology and EvolutionUniversity of BernBernSwitzerland
| | - Seth M. Rudman
- Department of Zoology and Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
- Department of BiologyUniversity of PennsylvaniaPhiladelphiaPennsylvania19104
| | - Dolph Schluter
- Department of Zoology and Biodiversity Research CentreUniversity of British ColumbiaVancouverBritish ColumbiaCanada
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12
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Harmon LJ, Andreazzi CS, Débarre F, Drury J, Goldberg EE, Martins AB, Melián CJ, Narwani A, Nuismer SL, Pennell MW, Rudman SM, Seehausen O, Silvestro D, Weber M, Matthews B. Detecting the macroevolutionary signal of species interactions. J Evol Biol 2019; 32:769-782. [DOI: 10.1111/jeb.13477] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/26/2019] [Accepted: 04/04/2019] [Indexed: 02/04/2023]
Affiliation(s)
- Luke J. Harmon
- Department of Fish Ecology and Evolution, Center for Ecology, Evolution and Biogeochemistry Eawag Kastanienbaum Switzerland
- Department of Biological Sciences University of Idaho Moscow Idaho
| | | | - Florence Débarre
- Sorbonne Université, UPMC Univ Paris 06, CNRS, IRD, INRA, Université Paris Diderot, Institute of Ecology and Environmental Sciences (UMR7618) Paris France
| | | | - Emma E. Goldberg
- Department of Ecology, Evolution and Behavior University of Minnesota Saint Paul Minnesota
| | - Ayana B. Martins
- Department of Fish Ecology and Evolution, Center for Ecology, Evolution and Biogeochemistry Eawag Kastanienbaum Switzerland
- Instituto de Física ‘Gleb Wataghin’ Universidade Estadual de Campinas Campinas Brazil
| | - Carlos J. Melián
- Department of Fish Ecology and Evolution, Center for Ecology, Evolution and Biogeochemistry Eawag Kastanienbaum Switzerland
| | - Anita Narwani
- Department of Aquatic Ecology Swiss Federal Institute of Aquatic Science and Technology Eawag Dübendorf Switzerland
| | - Scott L. Nuismer
- Department of Biological Sciences University of Idaho Moscow Idaho
| | - Matthew W. Pennell
- Department of Zoology and Biodiversity Research Centre University of British Columbia Vancouver British Columbia
| | - Seth M. Rudman
- Department of Biology University of Pennsylvania Philadelphia Pennsylvania
| | - Ole Seehausen
- Department of Fish Ecology and Evolution, Center for Ecology, Evolution and Biogeochemistry Eawag Kastanienbaum Switzerland
- Institute of Ecology and Evolution University of Bern Bern Switzerland
| | - Daniele Silvestro
- Department of Biological and Environmental Sciences Global Gothenburg Biodiversity Centre University of Gothenburg Gothenburg Sweden
| | - Marjorie Weber
- Department of Plant Biology & Program in Ecology, Evolution, and Behavior Michigan State University East Lansing Michigan
| | - Blake Matthews
- Department of Fish Ecology and Evolution, Center for Ecology, Evolution and Biogeochemistry Eawag Kastanienbaum Switzerland
- Aquatic Ecology and Evolution, Institute of Ecology and Evolution University of Bern Bern Switzerland
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13
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Rudman SM, Goos JM, Burant JB, Brix KV, Gibbons TC, Brauner CJ, Jeyasingh PD. Ionome and elemental transport kinetics shaped by parallel evolution in threespine stickleback. Ecol Lett 2019; 22:645-653. [DOI: 10.1111/ele.13225] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 12/22/2018] [Accepted: 01/05/2019] [Indexed: 12/24/2022]
Affiliation(s)
- Seth M. Rudman
- Department of Biology University of Pennsylvania Philadelphia PA USA
| | - Jared M. Goos
- Department of Integrative Biology Oklahoma State University Stillwater OK USA
| | - Joseph B. Burant
- Department of Integrative Biology University of Guelph Guelph ON Canada
| | - Kevin V. Brix
- Department of Marine Biology and Ecology University of Miami RSMAS Miami FL USA
| | - Taylor C. Gibbons
- Department of Zoology University of British Columbia Vancouver BC Canada
| | - Colin J. Brauner
- Department of Zoology University of British Columbia Vancouver BC Canada
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Gygax M, Rentsch AK, Rudman SM, Rennison DJ. Differential predation alters pigmentation in threespine stickleback (Gasterosteus aculeatus). J Evol Biol 2018; 31:1589-1598. [PMID: 30055069 DOI: 10.1111/jeb.13354] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 07/10/2018] [Indexed: 11/27/2022]
Abstract
Animal pigmentation plays a key role in many biological interactions, including courtship and predator avoidance. Sympatric benthic and limnetic ecotypes of threespine stickleback (Gasterosteus aculeatus) exhibit divergent pigment patterns. To test whether differential predation by cutthroat trout contributes to the differences in pigmentation seen between the ecotypes, we used a within-generation selection experiment on F2 benthic-limnetic hybrids. After 10 months of differential selection, we compared the pigmentation of fish under trout predation to control fish not exposed to trout predation. We found that stickleback exhibited more lateral barring in ponds with trout predation. Ponds with trout were also less turbid, and a greater degree of barring was negatively correlated with the magnitude of turbidity across pond replicates. A more benthic diet, a proxy for habitat use, was also correlated with greater lateral barring and green dorsal pigmentation. These patterns suggest that differential exposure to cutthroat trout predation may explain the divergence in body pigmentation between benthic and limnetic ecotypes.
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Affiliation(s)
- Michelle Gygax
- Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - Ana K Rentsch
- Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - Seth M Rudman
- Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada.,Department of Biology, University of Pennsylvania, Pennsylvania, PA, USA
| | - Diana J Rennison
- Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, BC, Canada
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Sydes MR, Spears MR, Mason MD, Clarke NW, Dearnaley DP, de Bono JS, Attard G, Chowdhury S, Cross W, Gillessen S, Malik ZI, Jones R, Parker CC, Ritchie AWS, Russell JM, Millman R, Matheson D, Amos C, Gilson C, Birtle A, Brock S, Capaldi L, Chakraborti P, Choudhury A, Evans L, Ford D, Gale J, Gibbs S, Gilbert DC, Hughes R, McLaren D, Lester JF, Nikapota A, O'Sullivan J, Parikh O, Peedell C, Protheroe A, Rudman SM, Shaffer R, Sheehan D, Simms M, Srihari N, Strebel R, Sundar S, Tolan S, Tsang D, Varughese M, Wagstaff J, Parmar MKB, James ND. Adding abiraterone or docetaxel to long-term hormone therapy for prostate cancer: directly randomised data from the STAMPEDE multi-arm, multi-stage platform protocol. Ann Oncol 2018; 29:1235-1248. [PMID: 29529169 PMCID: PMC5961425 DOI: 10.1093/annonc/mdy072] [Citation(s) in RCA: 175] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Background Adding abiraterone acetate with prednisolone (AAP) or docetaxel with prednisolone (DocP) to standard-of-care (SOC) each improved survival in systemic therapy for advanced or metastatic prostate cancer: evaluation of drug efficacy: a multi-arm multi-stage platform randomised controlled protocol recruiting patients with high-risk locally advanced or metastatic PCa starting long-term androgen deprivation therapy (ADT). The protocol provides the only direct, randomised comparative data of SOC + AAP versus SOC + DocP. Method Recruitment to SOC + DocP and SOC + AAP overlapped November 2011 to March 2013. SOC was long-term ADT or, for most non-metastatic cases, ADT for ≥2 years and RT to the primary tumour. Stratified randomisation allocated pts 2 : 1 : 2 to SOC; SOC + docetaxel 75 mg/m2 3-weekly×6 + prednisolone 10 mg daily; or SOC + abiraterone acetate 1000 mg + prednisolone 5 mg daily. AAP duration depended on stage and intent to give radical RT. The primary outcome measure was death from any cause. Analyses used Cox proportional hazards and flexible parametric models, adjusted for stratification factors. This was not a formally powered comparison. A hazard ratio (HR) <1 favours SOC + AAP, and HR > 1 favours SOC + DocP. Results A total of 566 consenting patients were contemporaneously randomised: 189 SOC + DocP and 377 SOC + AAP. The patients, balanced by allocated treatment were: 342 (60%) M1; 429 (76%) Gleason 8-10; 449 (79%) WHO performance status 0; median age 66 years and median PSA 56 ng/ml. With median follow-up 4 years, 149 deaths were reported. For overall survival, HR = 1.16 (95% CI 0.82-1.65); failure-free survival HR = 0.51 (95% CI 0.39-0.67); progression-free survival HR = 0.65 (95% CI 0.48-0.88); metastasis-free survival HR = 0.77 (95% CI 0.57-1.03); prostate cancer-specific survival HR = 1.02 (0.70-1.49); and symptomatic skeletal events HR = 0.83 (95% CI 0.55-1.25). In the safety population, the proportion reporting ≥1 grade 3, 4 or 5 adverse events ever was 36%, 13% and 1% SOC + DocP, and 40%, 7% and 1% SOC + AAP; prevalence 11% at 1 and 2 years on both arms. Relapse treatment patterns varied by arm. Conclusions This direct, randomised comparative analysis of two new treatment standards for hormone-naïve prostate cancer showed no evidence of a difference in overall or prostate cancer-specific survival, nor in other important outcomes such as symptomatic skeletal events. Worst toxicity grade over entire time on trial was similar but comprised different toxicities in line with the known properties of the drugs. Trial registration Clinicaltrials.gov: NCT00268476.
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Affiliation(s)
- M R Sydes
- MRC Clinical Trials Unit at UCL, London.
| | | | | | - N W Clarke
- Christie and Royal Salford Hospital, Manchester
| | | | | | - G Attard
- UCL Cancer Institute, University College London, London
| | - S Chowdhury
- Guy's & St Thomas NHS, Foundation Trust, London
| | - W Cross
- St James University Hospital, Leeds, UK
| | - S Gillessen
- Division of Oncology and Hematology, Kantonsspital St. Gallen, St. Gallen; University of Bern, Bern; Swiss Group for Cancer Clinical Research (SAKK), Bern, Switzerland
| | - Z I Malik
- The Clatterbridge Cancer Centre NHS Foundation Trust, Liverpool
| | - R Jones
- Institute of Cancer Sciences, University of Glasgow, Glasgow; Beatson West of Scotland Cancer Centre, University of Glasgow, Glasgow
| | - C C Parker
- Institute of Cancer Research, Sutton; Royal Marsden Hospital, Sutton
| | | | - J M Russell
- Institute of Cancer Sciences, University of Glasgow, Glasgow; Beatson West of Scotland Cancer Centre, University of Glasgow, Glasgow
| | - R Millman
- MRC Clinical Trials Unit at UCL, London
| | - D Matheson
- Faculty of Education, Health and Wellbeing, University of Wolverhampton, Wolverhampton
| | - C Amos
- MRC Clinical Trials Unit at UCL, London
| | - C Gilson
- MRC Clinical Trials Unit at UCL, London
| | - A Birtle
- Rosemere Cancer Centre, Royal Preston Hospital, Preston
| | - S Brock
- Dorset Cancer Centre, Poole Hospital, Poole
| | - L Capaldi
- Worcestershire Acute Hospitals NHS Trust, Worcester
| | | | - A Choudhury
- Division of Cancer Sciences, University of Manchester, Manchester; Manchester Academic Health Science Centre, Manchester; Christie Hospital NHS Foundation Trust, Manchester
| | - L Evans
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield
| | - D Ford
- City Hospital, Cancer Centre at Queen Elizabeth Hospital, Birmingham
| | - J Gale
- Portsmouth Oncology Centre, Queen Alexandra Hospital, Portsmouth
| | | | - D C Gilbert
- Sussex Cancer Centre, Royal Sussex County Hospital, Brighton
| | - R Hughes
- Mount Vernon Group, Mount Vernon Hospital, Middlesex
| | | | | | | | - J O'Sullivan
- Centre for Cancer Research and Cell Biology, Queens University Belfast, Belfast; Belfast City Hospital, Belfast
| | - O Parikh
- Lancashire Teaching Hospitals NHS Trust, Preston
| | - C Peedell
- Department of Oncology & Radiotherapy, South Tees NHS Trust, Middlesbrough
| | - A Protheroe
- Oxford University Hospitals NHS Foundation Trust
| | - S M Rudman
- Guy's & St Thomas NHS, Foundation Trust, London
| | - R Shaffer
- Department of Oncology, Royal Surrey County Hospital, Guildford
| | - D Sheehan
- Royal Devon and Exeter Hospital, Exeter
| | - M Simms
- Hull & East Yorkshire Hospitals NHS Trust, Hull
| | - N Srihari
- Shrewsbury and Telford Hospitals NHS Trust, Shrewsbury, UK
| | - R Strebel
- Kantonsspital Graubünden, Chur; Swiss Group for Cancer Clinical Research (SAKK), Bern, Switzerland
| | - S Sundar
- Department of Oncology, Nottingham, University Hospitals NHS Trust, Nottingham
| | - S Tolan
- The Clatterbridge Cancer Centre NHS Foundation Trust, Liverpool
| | - D Tsang
- Southend Hospital, Southend-on-Sea
| | - M Varughese
- Musgrove Park Hospital, Taunton and Somerset NHS Foundation Trust
| | - J Wagstaff
- Swansea University College of Medicine, Swansea
| | | | - N D James
- Institute of Cancer and Genomic Sciences, University of Birmingham, Edgbaston, Birmingham, UK
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Rudman SM, Barbour MA, Csilléry K, Gienapp P, Guillaume F, Hairston Jr NG, Hendry AP, Lasky JR, Rafajlović M, Räsänen K, Schmidt PS, Seehausen O, Therkildsen NO, Turcotte MM, Levine JM. What genomic data can reveal about eco-evolutionary dynamics. Nat Ecol Evol 2017; 2:9-15. [DOI: 10.1038/s41559-017-0385-2] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 10/16/2017] [Indexed: 01/17/2023]
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17
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Rudman SM, Kreitzman M, Chan KM, Schluter D. Contemporary Evosystem Services: A Reply to Faith et al . Trends Ecol Evol 2017; 32:719-720. [DOI: 10.1016/j.tree.2017.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 07/19/2017] [Indexed: 10/19/2022]
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18
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Rudman SM, Kreitzman M, Chan KMA, Schluter D. Evosystem Services: Rapid Evolution and the Provision of Ecosystem Services. Trends Ecol Evol 2017; 32:403-415. [PMID: 28336183 DOI: 10.1016/j.tree.2017.02.019] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 02/23/2017] [Accepted: 02/24/2017] [Indexed: 12/21/2022]
Abstract
Evolution is recognized as the source of all organisms, and hence many ecosystem services. However, the role that contemporary evolution might play in maintaining and enhancing specific ecosystem services has largely been overlooked. Recent advances at the interface of ecology and evolution have demonstrated how contemporary evolution can shape ecological communities and ecosystem functions. We propose a definition and quantitative criteria to study how rapid evolution affects ecosystem services (here termed contemporary evosystem services) and present plausible scenarios where such services might exist. We advocate for the direct measurement of contemporary evosystem services to improve understanding of how changing environments will alter resource availability and human well-being, and highlight the potential utility of managing rapid evolution for future ecosystem services.
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Affiliation(s)
- Seth M Rudman
- Department of Zoology, University of British Columbia, 4200-6270 University Blvd, Vancouver, BC V6T 1Z4, Canada.
| | - Maayan Kreitzman
- Institute for Resources, Environment, and Sustainability, University of British Columbia, 429-2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Kai M A Chan
- Institute for Resources, Environment, and Sustainability, University of British Columbia, 429-2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
| | - Dolph Schluter
- Department of Zoology, University of British Columbia, 4200-6270 University Blvd, Vancouver, BC V6T 1Z4, Canada
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19
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Affiliation(s)
- Seth M. Rudman
- Dept of Zoology; Univ. of British Columbia 4200-6270 University Blvd. Vancouver; BC V6T1Z4 Canada
| | - Julian Heavyside
- Dept of Zoology; Univ. of British Columbia 4200-6270 University Blvd. Vancouver; BC V6T1Z4 Canada
| | - Diana J. Rennison
- Dept of Zoology; Univ. of British Columbia 4200-6270 University Blvd. Vancouver; BC V6T1Z4 Canada
| | - Dolph Schluter
- Dept of Zoology; Univ. of British Columbia 4200-6270 University Blvd. Vancouver; BC V6T1Z4 Canada
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20
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Rudman SM, Rodriguez-Cabal MA, Stier A, Sato T, Heavyside J, El-Sabaawi RW, Crutsinger GM. Adaptive genetic variation mediates bottom-up and top-down control in an aquatic ecosystem. Proc Biol Sci 2016. [PMID: 26203004 DOI: 10.1098/rspb.2015.1234] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Research in eco-evolutionary dynamics and community genetics has demonstrated that variation within a species can have strong impacts on associated communities and ecosystem processes. Yet, these studies have centred around individual focal species and at single trophic levels, ignoring the role of phenotypic variation in multiple taxa within an ecosystem. Given the ubiquitous nature of local adaptation, and thus intraspecific variation, we sought to understand how combinations of intraspecific variation in multiple species within an ecosystem impacts its ecology. Using two species that co-occur and demonstrate adaptation to their natal environments, black cottonwood (Populus trichocarpa) and three-spined stickleback (Gasterosteus aculeatus), we investigated the effects of intraspecific phenotypic variation on both top-down and bottom-up forces using a large-scale aquatic mesocosm experiment. Black cottonwood genotypes exhibit genetic variation in their productivity and consequently their leaf litter subsidies to the aquatic system, which mediates the strength of top-down effects from stickleback on prey abundances. Abundances of four common invertebrate prey species and available phosphorous, the most critically limiting nutrient in freshwater systems, are dictated by the interaction between genetic variation in cottonwood productivity and stickleback morphology. These interactive effects fit with ecological theory on the relationship between productivity and top-down control and are comparable in strength to the effects of predator addition. Our results illustrate that intraspecific variation, which can evolve rapidly, is an under-appreciated driver of community structure and ecosystem function, demonstrating that a multi-trophic perspective is essential to understanding the role of evolution in structuring ecological patterns.
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Affiliation(s)
- Seth M Rudman
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, British Columbia, Canada V6T1Z4
| | - Mariano A Rodriguez-Cabal
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, British Columbia, Canada V6T1Z4 Grupo de Ecologia de Invasiones, INIBIOMA-CONICET, Universidad Nacional del Comahue-Av. De los Pioneros, Bariloche Rio Negro, CP 8400, Argentina
| | - Adrian Stier
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, British Columbia, Canada V6T1Z4 National Center for Ecological Analysis and Synthesis, 735 State Street, Santa Barbara, CA 93101, USA
| | - Takuya Sato
- Department of Biology, Graduate school of Science, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan
| | - Julian Heavyside
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, British Columbia, Canada V6T1Z4
| | - Rana W El-Sabaawi
- Department of Biology, University of Victoria, Cunningham 202, 3800 Finnerty Road, Victoria, BC, Canada V8P 5C2
| | - Gregory M Crutsinger
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, British Columbia, Canada V6T1Z4
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21
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El-Sabaawi RW, Warbanski ML, Rudman SM, Hovel R, Matthews B. Investment in boney defensive traits alters organismal stoichiometry and excretion in fish. Oecologia 2016; 181:1209-20. [PMID: 27075487 DOI: 10.1007/s00442-016-3599-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 02/28/2016] [Indexed: 01/29/2023]
Abstract
Understanding how trait diversification alters ecosystem processes is an important goal for ecological and evolutionary studies. Ecological stoichiometry provides a framework for predicting how traits affect ecosystem function. The growth rate hypothesis of ecological stoichiometry links growth and phosphorus (P) body composition in taxa where nucleic acids are a significant pool of body P. In vertebrates, however, most of the P is bound within bone, and organisms with boney structures can vary in terms of the relative contributions of bones to body composition. Threespine stickleback populations have substantial variation in boney armour plating. Shaped by natural selection, this variation provides a model system to study the links between evolution of bone content, elemental body composition, and P excretion. We measure carbon:nitrogen:P body composition from stickleback populations that vary in armour phenotype. We develop a mechanistic mass-balance model to explore factors affecting P excretion, and measure P excretion from two populations with contrasting armour phenotypes. Completely armoured morphs have higher body %P but excrete more P per unit body mass than other morphs. The model suggests that such differences are driven by phenotypic differences in P intake as well as body %P composition. Our results show that while investment in boney traits alters the elemental composition of vertebrate bodies, excretion rates depend on how acquisition and assimilation traits covary with boney trait investment. These results also provide a stoichiometric hypothesis to explain the repeated loss of boney armour in threespine sticklebacks upon colonizing freshwater ecosystems.
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Affiliation(s)
- Rana W El-Sabaawi
- Department of Biology, University of Victoria, P.O. Box 1700, Station CSC, Victoria, BC, V8W 2Y2, Canada.
| | - Misha L Warbanski
- Department of Biology, University of Victoria, P.O. Box 1700, Station CSC, Victoria, BC, V8W 2Y2, Canada
| | - Seth M Rudman
- Department of Zoology, University of British Columbia, 4200-6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada
| | - Rachel Hovel
- School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA, 98195, USA
| | - Blake Matthews
- Department of Aquatic Ecology, Center for Ecology, Evolution and Biogeochemistry, Eawag, Kastanienbaum, 6047, Switzerland
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22
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Rudman SM, Schluter D. Ecological Impacts of Reverse Speciation in Threespine Stickleback. Curr Biol 2016; 26:490-5. [DOI: 10.1016/j.cub.2016.01.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 11/09/2015] [Accepted: 01/04/2016] [Indexed: 10/22/2022]
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23
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Gibbons TC, Rudman SM, Schulte PM. Responses to simulated winter conditions differ between threespine stickleback ecotypes. Mol Ecol 2016; 25:764-75. [DOI: 10.1111/mec.13507] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 11/23/2015] [Accepted: 11/26/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Taylor C. Gibbons
- Biodiversity Research Centre; Department of Zoology; University of British Columbia; 6270 University Blvd Vancouver BC Canada V6T 1Z4
| | - Seth M. Rudman
- Biodiversity Research Centre; Department of Zoology; University of British Columbia; 6270 University Blvd Vancouver BC Canada V6T 1Z4
| | - Patricia M. Schulte
- Biodiversity Research Centre; Department of Zoology; University of British Columbia; 6270 University Blvd Vancouver BC Canada V6T 1Z4
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24
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Crutsinger GM, Rudman SM, Rodriguez-Cabal MA, McKown AD, Sato T, MacDonald AM, Heavyside J, Geraldes A, Hart EM, LeRoy CJ, El-Sabaawi RW. Testing a ‘genes-to-ecosystems’ approach to understanding aquatic-terrestrial linkages. Mol Ecol 2014; 23:5888-903. [DOI: 10.1111/mec.12931] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 09/04/2014] [Accepted: 09/12/2014] [Indexed: 01/18/2023]
Affiliation(s)
- Gregory M. Crutsinger
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Seth M. Rudman
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Mariano A. Rodriguez-Cabal
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Athena D. McKown
- Department of Forest and Conservation Sciences; University of British Columbia; 2424 Main Mall Vancouver BC V6T 1Z4 Canada
| | - Takuya Sato
- Department of Biology; Graduate school of Science; Kobe University; 1-1 Rokkodai Nada-ku Kobe 657-8501 Japan
| | - Andrew M. MacDonald
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Julian Heavyside
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Armando Geraldes
- Department of Botany; University of British Columbia; 3529-6270 University Blvd. Vancouver BC V6T 1Z4 Canada
| | - Edmund M. Hart
- Department of Zoology; University of British Columbia; 4200-6270 University Blvd. Vancouver BC V6T1Z4 Canada
| | - Carri J. LeRoy
- Environmental Studies Program; The Evergreen State College; 2700 Evergreen Parkway NW Olympia WA 98505 USA
| | - Rana W. El-Sabaawi
- Department of Biology; University of Victoria; Cunningham 202, 3800 Finnerty Rd. Victoria BC V8P 5C2 Canada
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25
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Rudman SM, Josephs DH, Cambrook H, Karagiannis P, Gilbert AE, Dodev T, Hunt J, Koers A, Montes A, Taams L, Canevari S, Figini M, Blower PJ, Beavil AJ, Nicodemus CF, Corrigan C, Kaye SB, Nestle FO, Gould HJ, Spicer JF, Karagiannis SN. Harnessing engineered antibodies of the IgE class to combat malignancy: initial assessment of FcɛRI-mediated basophil activation by a tumour-specific IgE antibody to evaluate the risk of type I hypersensitivity. Clin Exp Allergy 2011; 41:1400-13. [PMID: 21569129 DOI: 10.1111/j.1365-2222.2011.03770.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND IgE antibodies, sequestered into tissues and retained locally by the high-affinity IgE receptor, FcɛRI, on powerful effector cells such as mast cells, macrophages and eosinophils, may offer improvements in the therapy of solid tumours. The chimeric antibody, MOv18 IgE, against the human ovarian carcinoma antigen, folate receptor α (FRα), is more effective than its IgG1 counterpart in xenograft models of ovarian cancer. Although MOv18 IgE binds to a single epitope on FRα and cannot cross-link IgE receptors on basophils, there remains a risk that components in the circulation of ovarian cancer patients might cross-link FRα-MOv18-IgE-receptor-FcɛRI complexes on basophils to cause type I hypersensitivity. OBJECTIVE To assess the propensity for MOv18 used in a therapeutic setting to cause FcɛRI-mediated type I hypersensitivity. METHODS As validated readouts of the potential for MOv18 to cause FcɛRI-mediated type I hypersensitivity we measured release of a granule-stored mediator from a rat basophilic leukaemia cell line RBL SX-38 stably transfected with human tetrameric (αβγ2) FcɛRI, and induction of CD63 on blood basophils from patients with ovarian carcinoma and healthy controls ex vivo. RESULTS Serum FRα levels were increased in ovarian cancer patients compared with healthy controls. MOv18 IgE alone, or in the presence of its antigen recombinant human FRα, or of healthy volunteer (n=14) or ovarian carcinoma patient (n=32) sera, did not induce RBL SX-38 cell degranulation. Exposure to FRα-expressing ovarian tumour cells at target-to-effector ratios expected within tumours induced degranulation. MOv18 IgE did not induce expression of CD63 in blood basophils from either healthy volunteers (n=6), or cancer patients, despite detectable levels of circulating FRα (n=5). CONCLUSION AND CLINICAL RELEVANCE These encouraging data are compatible with the hypothesis that, when ovarian carcinoma patients are treated with MOv18, FcɛRI-mediated activation of effector cells occurs within the tumour mass but not in the circulation mandating, with due caution, further pre-clinical studies.
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MESH Headings
- Animals
- Antibodies, Monoclonal, Murine-Derived/adverse effects
- Antibodies, Monoclonal, Murine-Derived/genetics
- Antibodies, Monoclonal, Murine-Derived/immunology
- Antibody Specificity
- Antigens, Neoplasm/immunology
- Basophils/immunology
- Carcinoma/immunology
- Carcinoma/therapy
- Cell Degranulation
- Cell Line, Tumor
- Female
- Folate Receptor 1/blood
- Folate Receptor 1/immunology
- Folate Receptor 1/metabolism
- Humans
- Hypersensitivity, Immediate/etiology
- Hypersensitivity, Immediate/immunology
- Immunoglobulin E/genetics
- Immunoglobulin E/immunology
- Ovarian Neoplasms/immunology
- Ovarian Neoplasms/therapy
- Protein Engineering
- Rats
- Receptors, IgE/immunology
- Tetraspanin 30/metabolism
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Affiliation(s)
- S M Rudman
- NIHR Biomedical Research Centre at Guy's and St Thomas's Hospitals and King's College London, Cutaneous Medicine & Immunotherapy Unit, St John's Institute of Dermatology, Division of Genetics & Molecular Medicine, King's College London School of Medicine, Guy's Hospital, King's College London, London, UK
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Rudman SM, Jameson MB, McKeage MJ, Savage P, Jodrell DI, Harries M, Acton G, Erlandsson F, Spicer JF. A phase 1 study of AS1409, a novel antibody-cytokine fusion protein, in patients with malignant melanoma or renal cell carcinoma. Clin Cancer Res 2011; 17:1998-2005. [PMID: 21447719 PMCID: PMC3071333 DOI: 10.1158/1078-0432.ccr-10-2490] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE AS1409 is a fusion protein comprising a humanized antibody BC1 linked to interleukin-12 (IL-12). It is designed to deliver IL-12 to tumor-associated vasculature using an antibody targeting the ED-B variant of fibronectin. EXPERIMENTAL DESIGN We conducted a phase 1 trial of weekly infusional AS1409 in renal carcinoma and malignant melanoma patients. Safety, efficacy, markers of IL-12-mediated immune response, and pharmacokinetics were evaluated. RESULTS A total of 11 melanoma and 2 renal cell carcinoma patients were treated. Doses of 15 and 25 μg/kg were studied. Most drug-related adverse events were grade 2 or less, and included pyrexia, fatigue, chills, headache, vomiting, and transient liver function abnormalities. Three dose limiting toxicities of grade 3 fatigue and transaminase elevation were seen at 25 μg/kg. IFN-γ and interferon-inducible protein-10 (IP-10) were elevated in all patients, indicating activation of cell-mediated immune response; this was attenuated at subsequent cycles. Antidrug antibody responses were seen in all patients, although bioassays indicate these do not neutralize AS1409 activity. Plasma half-life was 22 hours and not dose-dependent. Five patients received 6 cycles or more and a best response of at least stable disease was seen in 6 (46%) patients. Partial response was seen in a melanoma patient, and disease shrinkage associated with metabolic response was maintained beyond 12 months in another melanoma patient despite previous rapid progression. CONCLUSIONS The maximum tolerated dose was established at 15 μg/kg weekly. AS1409 is well tolerated at this dose. Evidence of efficacy assessed by RECIST, functional imaging, and biomarker response warrants the planned further investigation using this dose and schedule in malignant melanoma.
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Affiliation(s)
- SM Rudman
- King’s College London, London, UK
- Guy’s & St Thomas’ NHS Foundation Trust, London, UK
| | | | - MJ McKeage
- Auckland City Hospital, Auckland, New Zealand
| | - P Savage
- Hammersmith Hospital, London, UK
| | - DI Jodrell
- University of Cambridge, Addenbrooke’s Hospital, Cambridge, UK
| | - M Harries
- Guy’s & St Thomas’ NHS Foundation Trust, London, UK
| | - G Acton
- Antisoma Research Ltd, London, UK
| | | | - JF Spicer
- King’s College London, London, UK
- Guy’s & St Thomas’ NHS Foundation Trust, London, UK
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Abstract
Previous studies have investigated the expression of insulin-like growth factor-I (IGF-I) and its receptor in cultured skin cells or in whole skin. In order to fully understand the role of IGF-I in the skin and its appendages, however, a comprehensive study that details the expression of IGF-I and the IGF-I receptor in sections of human skin is needed. Therefore, we now report an immunocytochemical and in situ hybridization localization study of the cell types expressing IGF-I and its receptor in human adult skin and its appendages. We have observed that (i) dermal fibroblasts produce IGF-I, (ii) the epidermal basal keratinocytes are IGF-I negative but IGF-I receptor positive, and (iii) the keratinocytes of the stratum granulosum produce IGF-I. These observations indicate either that the mitogenesis of the basal keratinocytes is regulated by IGF-I expressed both in the dermis and in the stratum granulosum, or that dermal fibroblasts are responsible for sequestering IGF-I to the basal keratinocytes and that the stratum granulosum-derived IGF-I may be an autocrine regulator of epidermal differentiation. The distribution of IGF-I and its receptor in the hair follicle indicates that IGF-I may be a morphogen, not a mitogen, at those sites, because their proliferating cells, but not their differentiating cells, are IGF-I receptor negative. Further, IGF-I receptor expression by the dermal papilla appears to be switched off during the transition from anagen to catagen, which implies a regulatory role for IGF-I during the hair growth cycle.
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Affiliation(s)
- S M Rudman
- Department of Clinical Biochemistry, University of Cambridge, Addenbrookes Hospital, UK
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