Dimorphic sperm formation by <i>Sex-lethal</i>

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  • Hiroki Sakai
    Division of Evolutionary Developmental Biology, National Institute for Basic Biology, Myodaiji, 444-8585 Okazaki, Japan;
  • Hiroyuki Oshima
    Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601 Nagoya, Japan;
  • Kodai Yuri
    Faculty of Agriculture, Iwate University, Ueda, 020-8550 Morioka, Japan;
  • Hiroki Gotoh
    Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601 Nagoya, Japan;
  • Takaaki Daimon
    Department of Applied Biosciences, Graduate School of Agriculture, Kyoto University, 606-8502 Kyoto, Japan;
  • Toshinobu Yaginuma
    Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, 464-8601 Nagoya, Japan;
  • Ken Sahara
    Faculty of Agriculture, Iwate University, Ueda, 020-8550 Morioka, Japan;
  • Teruyuki Niimi
    Division of Evolutionary Developmental Biology, National Institute for Basic Biology, Myodaiji, 444-8585 Okazaki, Japan;

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説明

<jats:title>Significance</jats:title> <jats:p> Sperm exhibit dramatic evolutionarily divergent morphologies in almost all taxa. Some sexually reproductive species show polymorphisms in the sperm produced by single males. Here, we focused on <jats:italic>Sex-lethal</jats:italic> ( <jats:italic>Sxl</jats:italic> ), which is the master sex-determination gene in <jats:italic>Drosophila melanogaster</jats:italic> , and investigated its function in the lepidopteran insect <jats:italic>Bombyx mori</jats:italic> . Our genetic analyses revealed that <jats:italic>Sxl</jats:italic> is essential for the formation of anucleate nonfertile parasperm. It is not expected that <jats:italic>Sxl</jats:italic> would be involved in sperm polymorphisms. Yet, whereas many morphological observations and ecological surveys have been conducted on sperm polymorphisms, this paper identifies the gene involved in sperm polymorphisms. Moreover, we clearly demonstrate that parasperm of <jats:italic>B. mori</jats:italic> is necessary for sperm migration in female organs. </jats:p>

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