A macroevolutionary role for chromosomal fusion and fission in Erebia butterflies

Science Advances, Год журнала: 2024, Номер 10(16)

Опубликована: Апрель 17, 2024

The impact of large-scale chromosomal rearrangements, such as fusions and fissions, on speciation is a long-standing conundrum. We assessed whether bursts change in chromosome numbers resulting from fusion or fission are related to increased rates Erebia , one the most species-rich karyotypically variable butterfly groups. established genome-based phylogeny used state-dependent birth-death models infer trajectories karyotype evolution. demonstrated that anagenetic changes (i.e., along phylogenetic branches) exceed cladogenetic at events), but, when occur, they mostly associated with fissions rather than fusions. found relative importance differs among clades different ages especially younger, more diverse clades, frequently changes. Overall, our results imply have contrasting macroevolutionary roles rearrangements species diversification.

Язык: Английский

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Genetic basis of camouflage in an alpine plant and its long-term co-evolution with an insect herbivore

Nature Ecology & Evolution, Год журнала: 2025, Номер unknown

Опубликована: Март 10, 2025

Язык: Английский

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Genomic Landscape of Divergence in Ballan Wrasse (Labrus bergylta)

Molecular Ecology, Год журнала: 2025, Номер unknown

Опубликована: Март 17, 2025

ABSTRACT The architecture underpinning genomic divergence is still a largely uncharted territory and likely case‐dependent. Here, we investigated genome‐wide variation in Ballan wrasse, northeastern Atlantic fish species that displays two sympatric colour morphs, spotty plain, have been suggested to represent subspecies. We produced chromosome‐level reference genome thereafter among 152 individuals including both from localities Spain Norway each one France. Differences between morphs dominated accordance with divergence, whereas allopatric differentiation was prominent repeated signals of local were found. Chromosomes had large low‐recombining areas shared across all populations. Within the Spanish these contained islands totalling ~11% genome, showed high morph specificity strong selection. same regions frequent admixture French no Norway. In contrast, divergent observed sampling shorter found throughout genome. High inbreeding lower diversity Norwegian samples, consistent proposed recolonisation bottleneck subsequent drift. Several significantly associated tens genes diverse functions, suggesting colouration unlikely be sole driver divergence. Our results do not support hypothesis larger features underlying intraspecific Instead, observe gradual accumulation differences into regions, when additional factors like assortative mating and/or lack gene flow favour their development.

Язык: Английский

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Nascent evolution of recombination rate differences as a consequence of chromosomal rearrangements

PLoS Genetics, Год журнала: 2023, Номер 19(8), С. e1010717 - e1010717

Опубликована: Авг. 7, 2023

Reshuffling of genetic variation occurs both by independent assortment chromosomes and homologous recombination. Such reshuffling can generate novel allele combinations break linkage between advantageous deleterious variants which increases the potential efficacy natural selection. Here we used high-density maps to characterize global regional recombination rate in two populations wood white butterfly (Leptidea sinapis) that differ considerably their karyotype as a consequence at least 27 chromosome fissions fusions. The data were compared estimates diversity measures selection assess relationship chromosomal rearrangements, crossing over, maintenance adaptation. Our show is influenced size number, but difference number crossovers karyotypes reduced higher frequency double larger chromosomes. As expected from effects on linked sites, observed an overall positive association populations. results also revealed significant effect rearrangements intergenic change populations, limited polymorphisms coding sequence. We conclude have considerable landscape consequently influence efficiency

Язык: Английский

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Do chromosome rearrangements fix by genetic drift or natural selection? Insights from Brenthis butterflies

Molecular Ecology, Год журнала: 2023, Номер 33(24)

Опубликована: Окт. 9, 2023

Large-scale chromosome rearrangements, such as fissions and fusions, are a common feature of eukaryote evolution. They can have considerable influence on the evolution populations, yet it remains unclear exactly how rearrangements become established eventually fix. Rearrangements could fix by genetic drift if they weakly deleterious or neutral, may instead be favoured positive natural selection. Here, we compare genome assemblies three closely related Brenthis butterfly species characterize complex history fission fusion rearrangements. An inferred demographic these suggests that became fixed in populations with large long-term effective size (N

Язык: Английский

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GC Content Across Insect Genomes: Phylogenetic Patterns, Causes and Consequences

Journal of Molecular Evolution, Год журнала: 2024, Номер 92(2), С. 138 - 152

Опубликована: Март 15, 2024

Abstract The proportions of A:T and G:C nucleotide pairs are often unequal can vary greatly between animal species along chromosomes. causes consequences this variation incompletely understood. recent release high-quality genome sequences from the Darwin Tree Life other large-scale projects provides an opportunity for GC heterogeneity to be compared across a large number insect species. Here we analyse content chromosomes, within protein-coding genes codons, 150 four holometabolous orders: Coleoptera, Diptera, Hymenoptera, Lepidoptera. We find that have higher than average, Lepidoptera generally three orders examined. is in small chromosomes most species, but pattern less consistent orders. also increases towards subtelomeric regions Coleoptera Two Bombylius major B. discolo r, very atypical genomes with ubiquitous increase AT content, especially at third codon positions. Despite dramatic AT-biased usage, no evidence has driven divergent protein evolution. argue landscape Lepidoptera, Diptera influenced by GC-biased gene conversion, strongest some outlier taxa affected drastically counteracting processes.

Язык: Английский

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Causes and consequences of a complex recombinational landscape in the antCardiocondyla obscurior

Genome Research, Год журнала: 2024, Номер 34(6), С. 863 - 876

Опубликована: Июнь 1, 2024

Eusocial Hymenoptera have the highest recombination rates among all multicellular animals studied so far, but it is unclear why this and how affects biology of individual species. A high-resolution linkage map for ant

Язык: Английский

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The adaptive value of recombination in resolving intralocus sexual conflict by gene duplication

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2025, Номер 292(2039)

Опубликована: Янв. 1, 2025

Recombination plays a key role in increasing the efficacy of selection. We investigate whether recombination can also play resolving adaptive conflicts at loci coding for traits shared between sexes. Errors during events resulting gene duplications may provide long-term evolutionary advantage if those experience sexually antagonistic (SA) selection since, after duplication, sex-specific expression profiles will be free to evolve, thereby reducing load on population fitness and conflict. The potential duplication tempered by short-term deleterious effects gamete zygote survival, which tolerable species with high reproductive output but not low output. used datasets candidate SA from Drosophila melanogaster humans test these ideas. As humans, alleles flies net positive across two sexes occurred higher frequencies than negative effects. In flies, rates were associated more intense levels sexual conflict genes paralogues occur regions rates, indicating are history Genes experiencing showed both proportion numbers paralogues. Together, our findings reveal multiple lines evidence possible route towards resolution an via that is facilitated rates.

Язык: Английский

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Temporal dynamics of faster neo-Z evolution in butterflies

Evolution, Год журнала: 2024, Номер 78(9), С. 1554 - 1567

Опубликована: Май 30, 2024

The faster-Z/X hypothesis predicts that sex-linked genes should diverge faster than autosomal genes. However, studies across different lineages have shown mixed support for this effect. So far, most analyses focused on old and well-differentiated sex chromosomes, but less is known about the divergence of more recently acquired neo-sex chromosomes. In Lepidoptera (moths butterflies), Z-autosome fusions are frequent, evolutionary dynamics neo-Z chromosomes not been explored in detail. Here, we analyzed faster-Z effect Leptidea sinapis, a butterfly with three Z We show stepwise, resulting strata differentiation masculinization. While all showed evidence effect, selection youngest chromosome (Z3) appears to hampered by largely intact, homologous neo-W chromosome. intermediately aged (Z2), which lacks W gametologs, fewer constraints, particularly fast evolution. Our results therefore can constitute temporary hot-spots adaptation divergence. underlying likely causally linked shifts selective evolution gene expression, degeneration W-linked gametologs gradually expose Z-linked selection.

Язык: Английский

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Male-biased recombination at chromosome ends in a songbird revealed by precisely mapping crossover positions

G3 Genes Genomes Genetics, Год журнала: 2024, Номер 14(9)

Опубликована: Июль 10, 2024

Abstract Recombination plays a crucial role in evolution by generating novel haplotypes and disrupting linkage between genes, thereby enhancing the efficiency of selection. Here, we analyze genomes 12 great reed warblers (Acrocephalus arundinaceus) 3-generation pedigree to identify precise crossover positions along chromosomes. We located more than 200 crossovers found that these were highly concentrated toward telomeric ends Apart from this major pattern recombination landscape, significantly higher frequencies genic compared with intergenic regions, exons introns. Moreover, while number events was similar sexes, closer paternal maternal In conclusion, our study warbler revealed substantial variation within chromosomes, distinct bias sub-telomeric particularly on side. These findings emphasize importance thoroughly screening entire length chromosomes characterize landscape uncover potential sex-biases recombination.

Язык: Английский

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