Multiple Transitions between Y Chromosome and Autosome in Tago’s Brown Frog Species Complex

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  • Ikuo Miura
    Amphibian Research Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • Foyez Shams
    Institute for Applied Ecology, Centre for Conservation Ecology and Genomics, Faculty of Science and Technology, University of Canberra, Canberra, ACT 2617, Australia
  • Jun’ichi Ohki
    Natural History Museum and Institute, Chiba 260-8682, Japan
  • Masataka Tagami
    Gifu World Freshwater Aquarium, Kakamigahara, Gifu 501-6021, Japan
  • Hiroyuki Fujita
    Saitama Museum of Rivers, Yorii-Machi, Oosato-Gun, Saitama 369-1217, Japan
  • Chiao Kuwana
    Amphibian Research Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • Chiyo Nanba
    Amphibian Research Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • Takanori Matsuo
    Department of Preschool Education, Nagasaki Women’s Junior College, Nagasaki 850-0823, Japan
  • Mitsuaki Ogata
    Preservation and Research Center, City of Yokohama, Yokohama 241-0804, Japan
  • Shuuji Mawaribuchi
    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
  • Norio Shimizu
    Hiroshima University Museum, Higashi-Hiroshima 739-8524, Japan
  • Tariq Ezaz
    Institute for Applied Ecology, Centre for Conservation Ecology and Genomics, Faculty of Science and Technology, University of Canberra, Canberra, ACT 2617, Australia

説明

<jats:p>Sex chromosome turnover is the transition between sex chromosomes and autosomes. Although many cases have been reported in poikilothermic vertebrates, their evolutionary causes and genetic mechanisms remain unclear. In this study, we report multiple transitions between the Y chromosome and autosome in the Japanese Tago’s brown frog complex. Using chromosome banding and molecular analyses (sex-linked and autosomal single nucleotide polymorphisms, SNPs, from the nuclear genome), we investigated the frogs of geographic populations ranging from northern to southern Japan of two species, Rana tagoi and Rana sakuraii (2n = 26). Particularly, the Chiba populations of East Japan and Akita populations of North Japan in R. tagoi have been, for the first time, investigated here. As a result, we identified three different sex chromosomes, namely chromosomes 3, 7, and 13, in the populations of the two species. Furthermore, we found that the transition between the Y chromosome (chromosome 7) and autosome was repeated through hybridization between two or three different populations belonging to the two species, followed by restricted chromosome introgression. These dynamic sex chromosome turnovers represent the first such findings in vertebrates and imply that speciation associated with inter- or intraspecific hybridization plays an important role in sex chromosome turnover in frogs.</jats:p>

収録刊行物

  • Genes

    Genes 15 (3), 300-, 2024-02-26

    MDPI AG

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