Autosomal Sex-Determining System of the Housefly : Discovery of the First-Chromosomal Male Factor in Kitakyushu, Japan

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  • TSUKAMOTO Masuhisa
    Department of Medical Zoology, School of Medicine, University of Occupational and Environmental Health
  • SHONO Toshio
    Department of Medical Zoology, School of Medicine, University of Occupational and Environmental Health
  • HORIO Masahiro
    Department of Medical Zoology, School of Medicine, University of Occupational and Environmental Health

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Other Title
  • 北九州産イエバエの性決定様式 : 日本で初めて発見された第1常染色体上の雄性決定因子

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Abstract

Besides the usual sex-determining system by sex-chromosomes (X and Y), several autosomal sex-determining factors are known in the housefly. Among them the 2nd and 3rd chromosomal male factors are most frequent in various areas of the world. By using multichromosomal mutant marker strains, the autosomal sex-determining system has been analyzed in field-collected colonies of the housefly from Kitakyushu, Japan. In addition to the majority of ⅡM and ⅢM male factors, one ⅠM and two ⅤM cases have been discovered from these flies. No published data had been available on the presence of ⅠM type flies until evidence was recently reported from Fiji populations. Thus the present paper is not only to report the first discovery of the ⅠM case in Japan but also the second record on such a rare type of the sex-determination in the world. The presence of neither feminizing factor F nor the 4th chromosomal male factor ⅣM was detected from these populations examined so far. Cytological examinations also showed that almost all flies possessed XX karyotype with a few XO or XXX types instead of the normal XX-XY types. A new visible mutant allele bwb79K (brown-body) was isolated from one of the colonies.

Journal

  • Journal of UOEH

    Journal of UOEH 2 (2), 235-252, 1980

    The University of Occupational and Environmental Health, Japan

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