International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Analysis of silkworm molecular breeding potential using CRISPR/Cas9 systems for white egg 2 gene

  • Park, Jong Woo (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Yu, Jeong Hee (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Kim, Su-Bae (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Kim, Seong-Wan (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Kim, Seong-Ryul (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Choi, Kwang-Ho (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Kim, Jong Gil (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA) ;
  • Kim, Kee Young (Sericultural and Apicultural Materials Division, National Institute of Agricultural Science, RDA)
  • Received : 2019.05.31
  • Accepted : 2019.08.29
  • Published : 2019.09.28
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Abstract

Genome editing by CRISPR/Cas9, a third-generation gene scissor in molecular breeding at the genome level, is attracting much attention as one of the breeding techniques of the future. In this study, genetic and phenotypic analysis was used to examine the responsiveness of the Bakokjam variety of the silkworm Bombyx mori to molecular breeding using CRISPR/Cas9 in editing the white egg 2 (w-2) gene. The nucleotide sequence of the w-2 gene was analyzed and three different guide RNAs (gRNA) were prepared. The synthesized gRNA was combined with Cas9 protein and then analyzed by T7 endonuclease I after introduction into the Bm-N silkworm cell line. To edit the silkworm gene, W1N and W2P gRNA and Cas9 complexes were microinjected into silkworm embryos. Based on the results of microinjection, the hatching rate was 16-24% and the incidence of mutation was 33-37%. The gene mutation was verified in the heterozygous F1 generation, but no phenotypic change was observed. In F2 homozygotes generated by F1 self-crosses, a mutant phenotype was observed. These results suggest that silkworm molecular breeding using the CRISPR/Cas9 system is possible and will be a very effective way to shorten the time required than the traditional breeding process.

Keywords

References

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