Abstract
The integrase from the Streptomyces bacteriophage φC31 carries out efficient recombination between an attP site in the phage genome and an attB site in the host chromosome. In the present study, we have used the φC31 integrase system to mediate site-specific recombination in the cultured silkworm cell line BmN4. A plasmid containing a cDNA encoding DsRed flanked by two φC31 attP sites was co-transfected together with a helper plasmid encoding the φC31 integrase into a cell line in which φC31 attB sites inserted between a baculovirus IE2 promoter, and a polyadenylation signal are present in one chromosome. Seven days after transfection, expression of DsRed was observed in transformed cells. Nucleotide sequence analysis demonstrated that the expected recombination between the attB and attP sites had been precisely carried out by the φC31 integrase. These results indicate that the φC31 site-specific recombination system should be widely applicable for efficient site-specific gene integration into silkworm chromosomes.
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This work was supported in part by grants-in-aids (Nos. 17380037 and 17658028) and National Bioresource Project from the Ministry of Education, Science, and Culture of Japan
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Nakayama, G., Kawaguchi, Y., Koga, K. et al. Site-specific gene integration in cultured silkworm cells mediated by φC31 integrase. Mol Genet Genomics 275, 1–8 (2006). https://doi.org/10.1007/s00438-005-0026-3
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DOI: https://doi.org/10.1007/s00438-005-0026-3