Adaptive introgression in animals: examples and comparison to new mutation and standing variation as sources of adaptive variation.
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The various attributes of these three potential sources of adaptive variation are compared, including balancing selection for multiple alleles for major histocompatibility complex (MHC), S and csd genes, pesticide resistance in mice, black colour in wolves and white colour in coyotes, Neanderthal or Denisovan ancestry in humans, and mimicry genes in Heliconius butterflies are examined.Abstract:
Adaptive genetic variation has been thought to originate primarily from either new mutation or standing variation. Another potential source of adaptive variation is adaptive variants from other (donor) species that are introgressed into the (recipient) species, termed adaptive introgression. Here, the various attributes of these three potential sources of adaptive variation are compared. For example, the rate of adaptive change is generally thought to be faster from standing variation, slower from mutation and potentially intermediate from adaptive introgression. Additionally, the higher initial frequency of adaptive variation from standing variation and lower initial frequency from mutation might result in a higher probability of fixation of the adaptive variants for standing variation. Adaptive variation from introgression might have higher initial frequency than new adaptive mutations but lower than that from standing variation, again making the impact of adaptive introgression variation potentially intermediate. Adaptive introgressive variants might have multiple changes within a gene and affect multiple loci, an advantage also potentially found for adaptive standing variation but not for new adaptive mutants. The processes that might produce a common variant in two taxa, convergence, trans-species polymorphism from incomplete lineage sorting or from balancing selection and adaptive introgression, are also compared. Finally, potential examples of adaptive introgression in animals, including balancing selection for multiple alleles for major histocompatibility complex (MHC), S and csd genes, pesticide resistance in mice, black colour in wolves and white colour in coyotes, Neanderthal or Denisovan ancestry in humans, mimicry genes in Heliconius butterflies, beak traits in Darwin's finches, yellow skin in chickens and non-native ancestry in an endangered native salamander, are examined.read more
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Tracking the progression of speciation: variable patterns of introgression across the genome provide insights on the species delimitation between progenitor–derivative spruces (Picea mariana × P. rubens)
TL;DR: The heterogeneous patterns of introgression across the genome indicated that the speciation process between black spruce and red spruce is young and incomplete, albeit some interspecific differences are maintained, allowing ongoing species divergence even in sympatry.
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Genomic consequences of a recent three-way admixture in supplemented wild brown trout populations revealed by local ancestry tracts.
TL;DR: An approach based on estimating local ancestry along individual chromosomes to provide a detailed picture of genomic admixture in supplemented populations to document admixture consequences in the brown trout Salmo trutta, which decades of stocking practices have profoundly impacted the genetic make‐up of wild populations.
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Vive la résistance: genome-wide selection against introduced alleles in invasive hybrid zones
Ryan P. Kovach,Brian K. Hand,Paul A. Hohenlohe,Ted Cosart,Matthew C. Boyer,Helen H. Neville,Clint C. Muhlfeld,Clint C. Muhlfeld,Stephen J. Amish,Kellie J. Carim,Shawn R. Narum,Winsor H. Lowe,Fred W. Allendorf,Gordon Luikart +13 more
TL;DR: The evolutionary and ecological consequences of hybridization between native and invasive species are notoriously complicated because patterns of selection acting on non-native alleles can vary through different selection patterns as discussed by the authors.
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The Timing and Direction of Introgression Under the Multispecies Network Coalescent.
Mark S. Hibbins,Matthew W. Hahn +1 more
TL;DR: A model for the timing and direction of introgression based on the multispecies network coalescent is developed, and from it two new statistics are suggested, D1 and D2, which can be used in conjunction with other information to test hypotheses relating to the timing or direction ofintrogression, respectively.
Journal ArticleDOI
The adaptive genomic landscape of beak morphology in Darwin's finches.
Lucinda P. Lawson,Kenneth Petren +1 more
TL;DR: The adaptive genomic landscape for Darwin's finches mirrors theoretical expectations based on morphological variation and the implication that a large number of genes are actively maintained to facilitate beak variation across parallel populations with documented interspecies admixture challenges the understanding of evolutionary processes in the wild.
References
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