Adaptive Genetic Exchange: A Tangled History of Admixture and Evolutionary Innovation

Arnold, Michael L.; Kunte, Krushnamegh

doi:10.1016/j.tree.2017.05.007

Cited by 115 publications

(95 citation statements)

References 58 publications

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“…Overall, our study provides strong support that introgressive hybridization from P. balsamifera generates a reservoir of new genetic variation associated with adaptive characters that may allow improved survival in northern regions of the P. trichocarpa range. More generally our results support a growing consensus placing introgression as a central evolutionary process (Arnold & Kunte, ).…”

Section: Discussionsupporting

confidence: 89%

Introgression fromPopulus balsamiferaunderlies adaptively significant variation and range boundaries inP. trichocarpa

et al. 2017

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SummaryIntrogression can be an important source of adaptive phenotypes, although conversely it can have deleterious effects. Evidence for adaptive introgression is accumulating but information on the genetic architecture of introgressed traits lags behind.Here we determine trait architecture in Populus trichocarpa under introgression from P. balsamifera using admixture mapping and phenotypic analyses.Our results reveal that admixture is a key driver of clinal adaptation and suggest that the northern range extension of P. trichocarpa depends, at least in part, on introgression from P. balsamifera. However, admixture with P. balsamifera can lead to potentially maladaptive early phenology, and a reduction in growth and disease resistance in P. trichocarpa. Strikingly, an introgressed chromosome 9 haplotype block from P. balsamifera restores the late phenology and high growth parental phenotype in admixed P. trichocarpa. This epistatic restorer block may be strongly advantageous in maximizing carbon assimilation and disease resistance in the southernmost populations where admixture has been detected. We also confirm a previously demonstrated case of adaptive introgression in chromosome 15 and show that introgression generates a transgressive chlorophyll-content phenotype.We provide strong support that introgression provides a reservoir of genetic variation associated with adaptive characters that allows improved survival in new environments.

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Section: Discussionsupporting

confidence: 89%

Introgression fromPopulus balsamiferaunderlies adaptively significant variation and range boundaries inP. trichocarpa

et al. 2017

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“…In theory, genetic introgression may provide novel genotypes selected for in response to new environments and niches (Anderson & Stebbins, 1954;Arnold, 1992;Arnold & Kunte, 2017;Hamilton & Miller, 2016). A widely accepted explanation for the regional shift in coyote body size is that hybridization with wolves introduced adaptive variation that contributed to larger size, which allowed eastern coyotes greater use of white-tailed deer (Odocoileus virginianus; Kays et al, 2010;Power et al, 2015;Way & Lynn, 2016;vonHoldt, Kays et al, 2016).…”

Section: Coyotes In the Southeastern United Statesmentioning

confidence: 99%

Geographic patterns in morphometric and genetic variation for coyote populations with emphasis on southeastern coyotes

Hinton

Heppenheimer

West

et al. 2019

Ecology and Evolution

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Prior to 1900, coyotes (Canis latrans) were restricted to the western and central regions of North America, but by the early 2000s, coyotes became ubiquitous throughout the eastern United States. Information regarding morphological and genetic structure of coyote populations in the southeastern United States is limited, and where data exist, they are rarely compared to those from other regions of North America. We assessed geographic patterns in morphology and genetics of coyotes with special consideration of coyotes in the southeastern United States. Mean body mass of coyote populations increased along a west‐to‐east gradient, with southeastern coyotes being intermediate to western and northeastern coyotes. Similarly, principal component analysis of body mass and linear body measurements suggested that southeastern coyotes were intermediate to western and northeastern coyotes in body size but exhibited shorter tails and ears from other populations. Genetic analyses indicated that southeastern coyotes represented a distinct genetic cluster that differentiated strongly from western and northeastern coyotes. We postulate that southeastern coyotes experienced lower immigration from western populations than did northeastern coyotes, and over time, genetically diverged from both western and northeastern populations. Coyotes colonizing eastern North America experienced different selective pressures than did stable populations in the core range, and we offer that the larger body size of eastern coyotes reflects an adaptation that improved dispersal capabilities of individuals in the expanding range.

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“…The recent proliferation of genomic data has revealed that phenotypes that evolved in one lineage can sometimes spread to other lineages with limited genetic exchange, causing mosaic genomes and a mismatch between phenotypic and genetic variation (reviewed in Mitchell‐Olds, Willis, & Goldstein, 2007; Palmer & Kronforst, ; Arnold, ). When introgression involves phenotypes and genotypes that have a selective advantage, this may enable more rapid evolution than possible with other sources of genetic variation (Arnold & Kunte, ; Hedrick, ). For example, introgression between lineages appears to have facilitated the evolution of mimetic wing pattern and coloration in Heliconius butterflies (Heliconius Genome Consortium ; Pardo‐Diaz et al., ).…”

Section: Introductionmentioning

confidence: 99%

Genomic evidence for asymmetric introgression by sexual selection in the common wall lizard

et al. 2018

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Strongly selected characters can be transferred from one lineage to another with limited genetic exchange, resulting in asymmetric introgression and a mosaic genome in the receiving population. However, systems are rarely sufficiently well studied to link the pattern of introgression to its underlying process. Male common wall lizards in western Italy exhibit exaggeration of a suite of sexually selected characters that make them outcompete males from a distantly related lineage that lack these characters. This results in asymmetric hybridization and adaptive introgression of the suite of characters following secondary contact. We developed genomewide markers to infer the demographic history of gene flow between different genetic lineages, identify the spread of the sexually selected syndrome, and test the prediction that introgression should be asymmetric and heterogeneous across the genome. Our results show that secondary contact was accompanied by gene flow in both directions across most of the genome, but with approximately 3% of the genome showing highly asymmetric introgression in the predicted direction. Demographic simulations reveal that this asymmetric gene flow is more recent than the initial secondary contact, and the data suggest that the exaggerated male sexual characters originated within the Italian lineage and subsequently spread throughout this lineage before eventually reaching the contact zone. These results demonstrate that sexual selection can cause a suite of characters to spread throughout both closely and distantly related lineages with limited gene flow across the genome at large.

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Adaptive Genetic Exchange: A Tangled History of Admixture and Evolutionary Innovation

Cited by 115 publications

References 58 publications

Introgression fromPopulus balsamiferaunderlies adaptively significant variation and range boundaries inP. trichocarpa

Introgression fromPopulus balsamiferaunderlies adaptively significant variation and range boundaries inP. trichocarpa

Geographic patterns in morphometric and genetic variation for coyote populations with emphasis on southeastern coyotes

Genomic evidence for asymmetric introgression by sexual selection in the common wall lizard

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