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Simultaneous induction of mutant alleles of two allergenic genes in soybean by using site-directed mutagenesis

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Title: Simultaneous induction of mutant alleles of two allergenic genes in soybean by using site-directed mutagenesis
Authors: Sugano, Shota Browse this author
Hirose, Aya Browse this author
Kanazashi, Yuhei Browse this author
Adachi, Kohei Browse this author
Hibara, Miki Browse this author
Itoh, Takeshi Browse this author
Mikami, Masafumi Browse this author
Endo, Masaki Browse this author
Hirose, Sakiko Browse this author
Maruyama, Nobuyuki Browse this author
Abe, Jun Browse this author
Yamada, Tetsuya Browse this author →KAKEN DB
Keywords: CRISPR
Glycine max
Gly m Bd 28 
Gly m Bd 30 
Hypoallergenic soybean
Issue Date: 11-Nov-2020
Publisher: BioMed Central
Journal Title: BMC plant biology
Volume: 20
Issue: 1
Start Page: 513
Publisher DOI: 10.1186/s12870-020-02708-6
Abstract: Background Soybean (Glycine max) is a major protein crop, because soybean protein has an amino acid score comparable to that of beef and egg white. However, many allergens have been identified among soybean proteins. A decrease in allergenic protein levels would be useful for expanding the market for soybean proteins and processed foods. Recently, the CRISPR/Cas9 system has been adopted as a powerful tool for the site-directed mutagenesis in higher plants. This system is expected to generate hypoallergenic soybean varieties. Results We used two guide RNAs (gRNAs) and Agrobacterium-mediated transformation for simultaneous site-directed mutagenesis of two genes encoding the major allergens Gly m Bd 28 K and Gly m Bd 30 K in two Japanese soybean varieties, Enrei and Kariyutaka. We obtained two independent T-0 Enrei plants and nine T-0 Kariyutaka plants. Cleaved amplified polymorphic sequence (CAPS) analysis revealed that mutations were induced in both targeted loci of both soybean varieties. Sequencing analysis showed that deletions were the predominant mutation type in the targeted loci. The Cas9-free plants carrying the mutant alleles of the targeted loci with the transgenes excluded by genetic segregation were obtained in the T-2 and T-3 generations. Variable mutational spectra were observed in the targeted loci even in T-2 and T-3 progenies of the same T-0 plant. Induction of multiple mutant alleles resulted in six haplotypes in the Cas9-free mutants derived from one T-0 plant. Immunoblot analysis revealed that no Gly m Bd 28 K or Gly m Bd 30 K protein accumulated in the seeds of the Cas9-free plants. Whole-genome sequencing confirmed that a Cas9-free mutant had also no the other foreign DNA from the binary vector. Our results demonstrate the applicability of the CRISPR/Cas9 system for the production of hypoallergenic soybean plants. Conclusions Simultaneous site-directed mutagenesis by the CRISPR/Cas9 system removed two major allergenic proteins from mature soybean seeds. This system enables rapid and efficient modification of seed components in soybean varieties.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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