2021
DOI: 10.1186/s12983-021-00387-z View full text |Buy / Rent full text
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Abstract: Background Invasive species bring a serious effect on local biodiversity, ecosystems, and even human health and safety. Although the genetic signatures of historical range expansions have been explored in an array of species, the genetic consequences of contemporary range expansions have received little attention, especially in mammal species. In this study, we used whole-genome sequencing to explore the rapid genetic change and introduction history of a newly invasive brown rat (Rattus norvegi… Show more

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“…We concur with this view that increasing human activities and global climate changes, especially global warming, contributed to the northward invasion of the AHR. Recently, an increasing number of studies have focused on the molecular mechanisms of adaptation in invasive rats and have demonstrated that genes involved in immunity, metabolism, diet, the nervous system, and locomotory behavior might facilitate the local adaptation of invasive BR populations (Chen, Zhao, et al, 2021; Harpak et al, 2021; Zeng et al, 2018). Here, we also found that genes with carbohydrate metabolism underwent positive selection in northwardly invasive AHRs.…”
Section: Discussionmentioning
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“…We concur with this view that increasing human activities and global climate changes, especially global warming, contributed to the northward invasion of the AHR. Recently, an increasing number of studies have focused on the molecular mechanisms of adaptation in invasive rats and have demonstrated that genes involved in immunity, metabolism, diet, the nervous system, and locomotory behavior might facilitate the local adaptation of invasive BR populations (Chen, Zhao, et al, 2021; Harpak et al, 2021; Zeng et al, 2018). Here, we also found that genes with carbohydrate metabolism underwent positive selection in northwardly invasive AHRs.…”
Section: Discussionmentioning
“…We further investigated genes with allele frequency shifts throughout the genome for northwardly invasive rats, which could be seen as selection signals in northern rats (Chen, Zhao, et al, 2021;Rubin et al, 2010;Willoughby et al, 2018). We identified 74 positively selected genes in northwardly invasive rats (Table S9), and found that these genes were mainly enriched in "G-protein coupled receptor signalling pathway", "G-protein coupled receptor activity", and "carbohydrate metabolic process" (corrected p < .05; Table S10).…”
Section: Population Genomic Signatures Of the Northwardly Invasive Ahrmentioning
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“…Other studies argue that the process of genetic bottlenecks can purge deleterious alleles, reveal beneficial cryptic variation or create new beneficial interactions among genomic elements (Colautti and Lau, 2015;Dlugosch et al, 2015;Stapley et al, 2015;Estoup et al, 2016;van Kleunen et al, 2018). The invasive brown rat (Rattus norvegicus) is a globally successful invader, but recent studies in China discovered that local populations had experienced severe bottlenecks and then rapidly differentiated since establishment in the 1970s, including new alleles associated with lipid metabolism and immunity genes (Chen et al, 2021).…”
Section: Discoveries and Limitations Of Genomic Studies Of Diverse Invasive Speciesmentioning