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    The impacts of drift and selection on genomic evolution in insects

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    Author
    Tong, KJ; Duchene, S; Lo, N; Ho, SYW
    Date
    2017-04-27
    Source Title
    PeerJ
    Publisher
    PEERJ INC
    University of Melbourne Author/s
    Duchene Garzon, Sebastian
    Affiliation
    Microbiology and Immunology
    Metadata
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    Document Type
    Journal Article
    Citations
    Tong, K. J., Duchene, S., Lo, N. & Ho, S. Y. W. (2017). The impacts of drift and selection on genomic evolution in insects. PEERJ, 5 (4), https://doi.org/10.7717/peerj.3241.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/255770
    DOI
    10.7717/peerj.3241
    Abstract
    Genomes evolve through a combination of mutation, drift, and selection, all of which act heterogeneously across genes and lineages. This leads to differences in branch-length patterns among gene trees. Genes that yield trees with the same branch-length patterns can be grouped together into clusters. Here, we propose a novel phylogenetic approach to explain the factors that influence the number and distribution of these gene-tree clusters. We apply our method to a genomic dataset from insects, an ancient and diverse group of organisms. We find some evidence that when drift is the dominant evolutionary process, each cluster tends to contain a large number of fast-evolving genes. In contrast, strong negative selection leads to many distinct clusters, each of which contains only a few slow-evolving genes. Our work, although preliminary in nature, illustrates the use of phylogenetic methods to shed light on the factors driving rate variation in genomic evolution.

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