International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Utilization of the Bombyx mori Hypothetical Protein 32 Promoter for Efficient Transgene Expression

  • Goo, Tae-Won (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Kim, Sung-Wan (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Kim, Seong-Ryul (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Park, Seung-Won (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Kang, Seok-Woo (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Lee, Kwang-Gill (Department of Agricultural Biology, National Academy of Agricultural Science, RDA) ;
  • Kwon, O-Yu (Department of Anatomy, College of Medicine, Chungnam National University) ;
  • Yun, Eun-Young (Department of Agricultural Biology, National Academy of Agricultural Science, RDA)
  • Received : 2010.06.08
  • Accepted : 2010.06.20
  • Published : 2010.06.30
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Abstract

For stable germline transformation, the promoter of Bombyx mori cytoplasmic actin gene (BmA3) has been used for ubiquitous expression of transgenes. So far, no strong promoter is available for ubiquitous expression in B. mori, excluding BmA3 promoter. To identify more powerful promoter than previously reported BmA3 promoter, we isolated 9 clones that show stronger signal compared to BmA3 by a dot blot hybridization. Among these 9 clones, we focused on one clone which has high amino acid homology (85%) with hypothetical protein 32 gene of Lonomia obliqua. This clone, named bHp32 (B. mori hypothetical protein 32) was ubiquitously expressed in all tissues and developmental stage of fifth instar B. mori larvae. As result of promoter assay using dual luciferase assay system, we found the highest transcription activity region (-1,200/+220) in the 5'-flanking region of bHp32 gene, which has 42-fold more intensive promoter activity than BmA3 promoter. Moreover, the bHp32 promoter was normally regulated in Bm5, Sf9, and S2 cells. Therefore, we suggest that bHp32 promoter may be used more powerful and effectively for transgene expression in various insects containing B. mori as a universal promoter.

Keywords

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