Method for rapid distinction of Bombyx mandarina (Japan) from B. mandarina (China) based on rDNA sequence differences

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  • Kawanishi Yuichi
    Functional Genomics Group, Center of Molecular Biosciences (COMB), University of the Ryukyus
  • Banno Yutaka
    Institute of Genetic Resources, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Fujimoto Hirofumi
    Division of Radiological Protection and Biology, National Institute of Infectious Diseases
  • Kab Nho Si
    College of Agriculture and Life Sciences, Kyungpook National University
  • Tu Zhenli
    College of Animal Sciences, Zhejiang University
  • Mita Kazuei
    Division of Insect Science, National Institute of Agrobiological Sciences
  • Tsuchida Kozo
    Division of Radiological Protection and Biology, National Institute of Infectious Diseases
  • Takada Naoko
    Division of Radiological Protection and Biology, National Institute of Infectious Diseases
  • Maekawa Hideaki
    Functional Genomics Group, Center of Molecular Biosciences (COMB), University of the Ryukyus Division of Radiological Protection and Biology, National Institute of Infectious Diseases
  • Nakajima Yumiko
    Functional Genomics Group, Center of Molecular Biosciences (COMB), University of the Ryukyus

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  • Method for rapid distinction of <i>Bombyx mandarina</i> (Japan) from <i>B. mandarina</i> (China) based on rDNA sequence differences

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The EcoRI site is located between the 5.8S and 28S rRNA genes in Bombyx mandarina (Japan)(Japanese type rDNA) but is absent in the rDNA of B. mandarina (China)(B. mori type rDNA) including the domesticated B. mori. Digestion of PCR products amplified by primers of both flanking sides of this EcoRI site with EcoRI should only be successful for amplification products of B. mandarina (Japan) containing Japanese type rDNA. The distribution of Japanese type rDNA in Japan, Korea, and China was determined using this rapid detection method. Japanese type was not detected in China or in Korea despite having 27 chromosomes. These findings suggest that the choromosome fusion and the rDNA type separation were independent evolutionary events. Invasion of B. mori chromosome #11 into Japanese B. mandarina (Japan) was examined.<br>

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