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김익수,이광식,강필돈,이인희,진병래,황재삼,강석우,류강선,이영신,차소영,손봉희 한국잠사학회 2004 International Journal of Industrial Entomology Vol.8 No.1
Synthetic oligodeoxynucleotides (ODNs) containing unmethylated CpG dinucleotides in particular base contexts are known to induce immunity in vertebrate cells. In insect, however, it was recent to find out that ODNs induces insect immunity as other immune inducer such as lipopolysaccharide. However, the finding was solely based on one lepidopteran insect, Bombyx mori, and the expression of insect immunity was neither dependent on numbers of CpG repeats nor methylation of CpG repeats within ODNs. Instead, foreignness of DNA has been suggested to be a key factor governing induction of antibacterial peptide. In this study, we expanded our previous understanding to the potentiality of ODNs as an immune inducer for antifungal peptide in Galleria mellonella and B. mori. To do this, a defensin-type antifungal peptide gene, reported from G. mellonella was cloned and partially sequenced from G. mellonella and B. mori successfully and utilized as a probe in the Northern blot analysis. We found out that ODNs also work as an immune inducer for antifungal peptide in the fat body and midgut of G. mellonella and B. mori larvae. Also, induction pattern of antifungal peptide was irrelevant to the numbers of CpG repeats within ODNs as previously reported on the induction pattern of antibacterial peptides.