The origin and remolding of genomic islands of differentiation in the European sea bass

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: June 22, 2018

Abstract Speciation is a complex process that leads to the progressive establishment of reproductive isolation barriers between diverging populations. Genome-wide comparisons closely related species have revealed existence heterogeneous divergence patterns, dominated by genomic islands increased supposed contain loci. However, this landscape only provides static picture dynamic speciation, during which confounding mechanisms unrelated speciation can interfere. Here we use haplotype-resolved whole-genome sequences identify responsible for formation Atlantic and Mediterranean sea bass lineages. Local ancestry patterns show first emerged in allopatry through linked selection acting on recombination landscape. Then, upon secondary contact, preexisting were strongly remolded differential introgression, revealing variable fitness effects among regions involved isolation. Interestingly, find divergent containing ancient polymorphisms conferred strongest resistance introgression.

Language: Английский

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What is Speciation Genomics? The roles of ecology, gene flow, and genomic architecture in the formation of species

Biological Journal of the Linnean Society, Journal Year: 2018, Volume and Issue: 124(4), P. 561 - 583

Published: April 27, 2018

As is true of virtually every realm the biological sciences, our understanding speciation increasingly informed by genomic revolution past decade. Investigators can ask detailed questions relating to both extrinsic (e.g. inter- and intra-population ecological interactions) intrinsic genome content architecture) forces that drive speciation. Technologies ranging from restriction-site associated DNA sequencing (RADseq), whole assembly, transcriptomics, CRISPR are revolutionizing means which investigators frame test hypotheses lineage diversification. Our review aims examine aspects Genome-scale data have already served fundamentally clarify role gene flow during (and after) speciation, although we predict differential propensity for among phylogenetic lineages will be one most exciting frontiers future investigation. We propose a unified theory take into account idiosyncratic features architecture examined in light each organism's biology ecology drawn across full breadth Tree Life.

Language: Английский

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The genomic landscape at a late stage of stickleback speciation: High genomic divergence interspersed by small localized regions of introgression

PLoS Genetics, Journal Year: 2018, Volume and Issue: 14(5), P. e1007358 - e1007358

Published: May 23, 2018

Speciation is a continuous process and analysis of species pairs at different stages divergence provides insight into how it unfolds. Previous genomic studies on young have revealed peaks heterogeneous differentiation. Yet less known localised differentiation progress to genome-wide during the later speciation in presence persistent gene flow. Spanning continuum, stickleback are ideal for investigating builds up speciation. However, attention has largely focused postglacial pairs, with little knowledge signatures introgression older systems. The Japanese pair, composed Pacific Ocean three-spined (Gasterosteus aculeatus) Japan Sea (G. nipponicus), which co-occur islands, late stage Divergence likely started well before end last glacial period crosses between females males result hybrid male sterility. Here we use coalescent analyses Approximate Bayesian Computation show that two split approximately 0.68–1 million years ago but they continued exchange genes low rate throughout divergence. Population data that, despite flow, high level maintained across majority genome. identified multiple, small regions introgression, occurring mainly areas recombination rate. Our results demonstrate can establish face flow be localized

Language: Английский

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Sympatric Speciation in the Genomic Era

Trends in Ecology & Evolution, Journal Year: 2017, Volume and Issue: 33(2), P. 85 - 95

Published: Nov. 30, 2017

Language: Английский

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The Paradox Behind the Pattern of Rapid Adaptive Radiation: How Can the Speciation Process Sustain Itself Through an Early Burst?

Annual Review of Ecology Evolution and Systematics, Journal Year: 2019, Volume and Issue: 50(1), P. 569 - 593

Published: Oct. 1, 2019

Rapid adaptive radiation poses a distinct question apart from speciation and adaptation: what happens after one event? That is, how are some lineages able to continue speciating through rapid burst? This connects global macroevolutionary patterns microevolutionary processes. Here we review major features of radiations in nature their mismatch with theoretical models is currently known about mechanisms. occur on three diversification axes - species richness, phenotypic disparity, ecological diversity exceptional outliers each axis. The paradox that the hallmark early stage radiation, burst niche diversification, contradicted by most existing which instead predict continuously decelerating rates subdivision time. Furthermore, while mechanisms such as magic traits, phenotype matching, physical linkage co-adapted alleles promote speciation, it often not discussed these could multiple events succession. Additional beyond opportunity needed understand occur. We evidence for five emerging theories: 1) 'transporter' hypothesis: introgression ancient origins alleles, 2) 'signal complexity' dimensionality sexual 3) connectivity fitness landscapes, 4) 'diversity begets diversity', 5) flexible stem/'plasticity first'. propose new questions predictions guide future work underlying rare radiation.

Language: Английский

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