Admixture has obscured signals of historical hard sweeps in humans

Nature Ecology & Evolution, Journal Year: 2022, Volume and Issue: 6(12), P. 2003 - 2015

Published: Oct. 31, 2022

The role of natural selection in shaping biological diversity is an area intense interest modern biology. To date, studies positive have primarily relied on genomic datasets from contemporary populations, which are susceptible to confounding factors associated with complex and often unknown aspects population history. In particular, admixture between diverged populations can distort or hide prior events genomes, though this process not explicitly accounted for most despite its apparent ubiquity humans other species. Through analyses ancient human we show that previously reported Holocene-era has masked more than 50 historic hard sweeps European genomes. Our results imply canonical mode probably been underappreciated the evolutionary history suggest our current understanding tempo may be inaccurate.

Language: Английский

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The Syngameon Enigma

Plants, Journal Year: 2022, Volume and Issue: 11(7), P. 895 - 895

Published: March 28, 2022

Despite their evolutionary relevance, multispecies networks or syngameons are rarely reported in the literature. Discovering how form and they maintained can give insight into processes such as adaptive radiations, island colonizations, creation of new hybrid lineages. Understanding these complex hybridization is even more pressing with anthropogenic climate change, may have unique synergistic properties that will allow participating species to persist. The formation a syngameon not insurmountable, several ways for been proposed, depending mostly on magnitude frequency gene flow events, well relatedness its participants. Episodic small amounts introgression keep stable protect participants from any detrimental effects flow. As genomic sequencing becomes cheaper included studies, number known expected increase. Syngameons must be considered conservation efforts extinction one survival all other network.

Language: Английский

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Inferring the Direction of Introgression Using Genomic Sequence Data

Molecular Biology and Evolution, Journal Year: 2023, Volume and Issue: 40(8)

Published: Aug. 1, 2023

Abstract Genomic data are informative about the history of species divergence and interspecific gene flow, including direction, timing, strength flow. However, flow in opposite directions generates similar patterns multilocus sequence data, such as reduced between hybridizing species. As a result, inference direction is challenging. Here, we investigate information present genomic using likelihood-based methods under multispecies-coalescent-with-introgression model. We analyze case two species, use simulation to examine cases with three or four find that it easier infer from small population large one than inflow (gene outgroup an ingroup species) outflow species). It also if there longer time separate evolution initial subsequent introgression. When introgression assumed occur wrong tends be correctly estimated Bayesian test often significant, while estimates probability can even greater true probability. sequences Heliconius butterflies demonstrate typical datasets well its timing strength.

Language: Английский

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Divergent Selection in Low Recombination Regions Shapes the Genomic Islands in Two Incipient Shorebird Species

Molecular Biology and Evolution, Journal Year: 2024, Volume and Issue: 41(2)

Published: Jan. 16, 2024

Abstract Speciation in the face of gene flow is usually associated with a heterogeneous genomic landscape divergence nascent species pairs. However, multiple factors, such as divergent selection and local recombination rate variation, can influence formation these islands. Examination landscapes pairs that are still early stages speciation provides an insight into this conundrum. In study, population analyses were undertaken using wide range sampling whole-genome resequencing data from 96 unrelated individuals Kentish plover (Charadrius alexandrinus) white-faced dealbatus). We suggest two exhibit varying levels admixture along Chinese coast on Taiwan Island. Genome-wide for introgression indicate ancient had occurred population, ongoing mainland coastal populations. Furthermore, we identified few regions significant interspecific differentiation suppression, which contain several genes potentially disease resistance, coloration, regulation plumage molting thus may be relevant to phenotypic ecological species. Overall, our findings low main force shaping islands incipient shorebird

Language: Английский

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Pervasive gene flow despite strong and varied reproductive barriers in swordtails

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: April 20, 2024

One of the mechanisms that can lead to formation new species occurs through evolution reproductive barriers. However, recent research has demonstrated hybridization been pervasive across tree life even in presence strong Swordtail fishes (genus

Language: Английский

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