Genomic architecture and introgression shape a butterfly radiation

Science, Год журнала: 2019, Номер 366(6465), С. 594 - 599

Опубликована: Окт. 31, 2019

We used 20 de novo genome assemblies to probe the speciation history and architecture of gene flow in rapidly radiating Heliconius butterflies. Our tests distinguish incomplete lineage sorting from introgression indicate that has obscured several ancient phylogenetic relationships this group over large swathes genome. Introgressed loci are underrepresented low-recombination gene-rich regions, consistent with purging foreign alleles more tightly linked incompatibility loci. Here, we identify a hitherto unknown inversion traps color pattern switch locus. infer was transferred between lineages by is convergent similar rearrangement another part genus. These multiple sequences enable improved understanding importance selective processes adaptive radiation.

Язык: Английский

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Massive haplotypes underlie ecotypic differentiation in sunflowers

Nature, Год журнала: 2020, Номер 584(7822), С. 602 - 607

Опубликована: Июль 8, 2020

Язык: Английский

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Evolving Inversions

Trends in Ecology & Evolution, Год журнала: 2019, Номер 34(3), С. 239 - 248

Опубликована: Янв. 26, 2019

Язык: Английский

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Prevalence and Adaptive Impact of Introgression

Annual Review of Genetics, Год журнала: 2021, Номер 55(1), С. 265 - 283

Опубликована: Сен. 28, 2021

Alleles that introgress between species can influence the evolutionary and ecological fate of exposed to novel environments. Hybrid offspring different are often unfit, yet it has long been argued introgression be a potent force in evolution, especially plants. Over last two decades, genomic data have increasingly provided evidence is critically important source genetic variation this additional useful adaptive evolution both animals Here, we review factors probability foreign variants provide long-term benefits (so-called introgression) discuss their potential benefits. We find plays an role particularly when far from its fitness optimum, such as they expand range or subject changing

Язык: Английский

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Mutation load at a mimicry supergene sheds new light on the evolution of inversion polymorphisms

Nature Genetics, Год журнала: 2021, Номер 53(3), С. 288 - 293

Опубликована: Янв. 25, 2021

Язык: Английский

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Supergene origin and maintenance in Atlantic cod

Nature Ecology & Evolution, Год журнала: 2022, Номер 6(4), С. 469 - 481

Опубликована: Фев. 17, 2022

Abstract Supergenes are sets of genes that inherited as a single marker and encode complex phenotypes through their joint action. They identified in an increasing number organisms, yet origins evolution remain enigmatic. In Atlantic cod, four megabase-scale supergenes have been linked to migratory lifestyle environmental adaptations. Here we investigate the origin maintenance these analysis whole-genome-sequencing data, including new long-read-based genome assembly for non-migratory cod individual. We corroborate finding chromosomal inversions underlie all supergenes, show they originated at different times between 0.40 1.66 million years ago. reveal gene flux supergene haplotypes where stationary co-occur conclude this is driven by conversion, on basis increase GC content exchanged sites. Additionally, find evidence double crossover haplotypes, leading exchange ~275 kilobase fragment with potentially involved adaptation low salinity Baltic Sea. Our results suggest can be maintained over long timescales same way hybridizing species, selective purging introduced genetic variation.

Язык: Английский

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Hybrid speciation driven by multilocus introgression of ecological traits

Nature, Год журнала: 2024, Номер 628(8009), С. 811 - 817

Опубликована: Апрель 17, 2024

Abstract Hybridization allows adaptations to be shared among lineages and may trigger the evolution of new species 1,2 . However, convincing examples homoploid hybrid speciation remain rare because it is challenging demonstrate that hybridization was crucial in generating reproductive isolation 3 Here we combine population genomic analysis with quantitative trait locus mapping species-specific traits examine a case Heliconius butterflies. We show elevatus sympatric both parents has persisted as an independently evolving lineage for at least 180,000 years. This despite pervasive ongoing gene flow one parent, pardalinus , which homogenizes 99% their genomes. The remaining 1% introgressed from other melpomene scattered widely across H. genome islands divergence These contain multiple are under disruptive selection, including colour pattern, wing shape, host plant preference, sex pheromones mate choice. Collectively, these place on its own adaptive peak permit coexistence parents. Our results driven by introgression ecological traits, possible multilocus genetic architecture.

Язык: Английский

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A region of suppressed recombination misleads neoavian phylogenomics

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(15)

Опубликована: Апрель 1, 2024

Genomes are typically mosaics of regions with different evolutionary histories. When speciation events closely spaced in time, recombination makes the sharing same history small, and changes rapidly as we move along genome. examining rapid radiations such early diversification Neoaves 66 Mya, no consistent is observed across segments exceeding kilobases Here, report an exception. We found that a 21-Mb region avian genomes, mapped to chicken chromosome 4, shows extremely strong discordance-free signal for from inferred species tree. Such signal, indicative suppressed many millions base pairs, not elsewhere genome any deep relationships. Although long have been documented recently diverged species, our results pertain relationships dating circa 65 Mya. provide evidence this may be due ancient rearrangement blocked remained polymorphic several million years prior fixation. show presence has misled previous phylogenomic efforts lower taxon sampling, showing interplay between locus sampling. predict similar rearrangements confound phylogenetic analyses other clades, pointing need new analytical models incorporate possibility events.

Язык: Английский

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The Genomic Basis of Color Pattern Polymorphism in the Harlequin Ladybird

Current Biology, Год журнала: 2018, Номер 28(20), С. 3296 - 3302.e7

Опубликована: Авг. 23, 2018

Many animal species comprise discrete phenotypic forms. A common example in natural populations of insects is the occurrence different color patterns, which has motivated a rich body ecological and genetic research [1-6]. The dark, i.e., melanic, forms displaying patterns found across multiple taxa, but underlying genomic basis remains poorly characterized. In numerous ladybird (Coccinellidae), spatial arrangement black red patches on adult elytra varies wildly within species, forming strikingly complex [7, 8]. harlequin ladybird, Harmonia axyridis, more than 200 distinct have been described, classic studies suggest result from allelic variation at single, unknown, locus [9, 10]. Here, we combined whole-genome sequencing, population-based genome-wide association studies, gene expression, functional analyses to establish that transcription factor Pannier controls melanic pattern polymorphism H. axyridis. We show pannier necessary for formation elements elytra. Allelic leads protein expression domains thus determines Recombination between alleles may be reduced by highly divergent sequence ∼170 kb cis-regulatory regions pannier, with 50 inversion This most likely helps maintain populations. Thus, propose variable can arise through single gene.

Язык: Английский

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Genomic architecture of parallel ecological divergence: Beyond a single environmental contrast

Science Advances, Год журнала: 2019, Номер 5(12)

Опубликована: Дек. 5, 2019

The study of parallel ecological divergence provides important clues to the operation natural selection. Parallel often occurs in heterogeneous environments with different kinds environmental gradients locations, but genomic basis underlying this process is unknown. We investigated genomics rapid adaptation marine snail Littorina saxatilis response two independent axes (crab-predation versus wave-action and low-shore high-shore). Using pooled whole-genome resequencing, we show that sharing regions high differentiation between generally low increases at smaller spatial scales. identify shared for each axis most these overlap candidate chromosomal inversions. Several inversion are divergent polymorphic across many localities. argue inversions could store variation fuels environments, possibly as balanced polymorphism by adaptive gene flow.

Язык: Английский

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