[Objective] The aim of this research was to study the expression of silkworm attacin gene induced by some different microorganisms.[Method] Three kinds of microorganism,BmNPV,JM109 and Agrobacterium LBA4404,were ingested to silkworm and the expression profile of attacin gene in hemocyte and fat body was detected by semi-quantitative PCR.And subsequently,the PCR products were cloned and sequenced for further analysis.[Result] A specific band,about 800 bp,appeared in fat body of all induced silkworms.As indicated by the results of cloning and sequencing(GenBank accession number:FJ373019),the band was produced because the 2 introns existing in normal expression form were not spliced.Furthermore,when the extended expression sequence was translated into amino acids,the translation stopped earlier by the stop codon TGA at the 5' end of the first intron of the original sequence,leading the loss of attacin C terminus.[Conclusion] There were two splicesomes of attacin gene,which had reference value to study the role of the attacin gene in silkworm immunity.
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