Mutations induced in Drosophila during space flight.

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  • Ikenaga Mituo
    Radiation Biology Center, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501,
  • Yoshikawa Isao
    Department of Genetics, Nagasaki University School of Medicine, 12-4 Sakamoto-machi, Nagasaki 852-8102,
  • Kojo Moto
    Department of Genetics, Nagasaki University School of Medicine, 12-4 Sakamoto-machi, Nagasaki 852-8102,
  • Ayaki Toshikazu
    Department of Genetics, Nagasaki University School of Medicine, 12-4 Sakamoto-machi, Nagasaki 852-8102,
  • Ryo Haruko
    Department of Radiation Biology, Faculty of Medicine, Osaka University, Yamada-oka 2-2, Suita, Osaka 565-0871, Japan
  • Ishizaki Kanji
    Radiation Biology Center, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501,
  • Kato Tomohisa
    Radiation Biology Center, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501,
  • Yamamoto Hanako
    Radiation Biology Center, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501,
  • Hara Ryujiro
    Radiation Biology Center, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501,

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  • Mutations Induced in Drosophila during

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To examine the possible effects of space radiation on living organisms, fruit flies Drosophila melanogaster were loaded on the US Space Shuttle Endeavour, and after the flight we have analyzed two types of mutations, sex-linked recessive lethal mutations induced in male reproductive cells and somatic mutations which give rise to morphological changes in hairs growing on the surface of wing epidermal cells. Wild type strains and a radiation-sensitive strain mei-41 were used. The frequencies of sex-linked recessive lethal mutations in flight groups were 2 and 3 times higher for wild type Canton-S and mei-41 strains, respectively, than those in ground control groups. By contrast, the frequencies of wing-hair somatic mutations differed little between flight and control groups. The possibility that the space environment causes mutations in certain types of cells such as male reproductive cells, is discussed.

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