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Rapid neo-sex chromosome evolution and incipient speciation in a major forest pest

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  • Ryan R. Bracewell

    (The University of Montana
    University of California)

  • Barbara J. Bentz

    (USDA Forest Service Rocky Mountain Research Station)

  • Brian T. Sullivan

    (USDA Forest Service Southern Research Station)

  • Jeffrey M. Good

    (The University of Montana)

Abstract

Genome evolution is predicted to be rapid following the establishment of new (neo) sex chromosomes, but it is not known if neo-sex chromosome evolution plays an important role in speciation. Here we combine extensive crossing experiments with population and functional genomic data to examine neo-XY chromosome evolution and incipient speciation in the mountain pine beetle. We find a broad continuum of intrinsic incompatibilities in hybrid males that increase in strength with geographic distance between reproductively isolated populations. This striking progression of reproductive isolation is coupled with extensive gene specialization, natural selection, and elevated genetic differentiation on both sex chromosomes. Closely related populations isolated by hybrid male sterility also show fixation of alternative neo-Y haplotypes that differ in structure and male-specific gene content. Our results suggest that neo-sex chromosome evolution can drive rapid functional divergence between closely related populations irrespective of ecological drivers of divergence.

Suggested Citation

  • Ryan R. Bracewell & Barbara J. Bentz & Brian T. Sullivan & Jeffrey M. Good, 2017. "Rapid neo-sex chromosome evolution and incipient speciation in a major forest pest," Nature Communications, Nature, vol. 8(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01761-4
    DOI: 10.1038/s41467-017-01761-4
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    Cited by:

    1. Lulu Xu & Yandong Ren & Jiahong Wu & Tingting Cui & Rong Dong & Chen Huang & Zhe Feng & Tianmin Zhang & Peng Yang & Jiaqing Yuan & Xiao Xu & Jiao Liu & Jinhong Wang & Wu Chen & Da Mi & David M. Irwin , 2024. "Evolution and expression patterns of the neo-sex chromosomes of the crested ibis," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    2. Zhen Huang & Ivanete De O. Furo & Jing Liu & Valentina Peona & Anderson J. B. Gomes & Wan Cen & Hao Huang & Yanding Zhang & Duo Chen & Ting Xue & Qiujin Zhang & Zhicao Yue & Quanxi Wang & Lingyu Yu & , 2022. "Recurrent chromosome reshuffling and the evolution of neo-sex chromosomes in parrots," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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