Abstract: 　Objective] To amplify and sequence the light chain of anti idiotypic monoclonal antibody NP30 of Schistosoma japonicum. [Methods] By comparing the conserved regions at each end of the nucleotide sequences of murine germ line genes enco ding FR1 and FR4 regions of immunoglobulin light chain variable regions, we designed a set of primers for amplification of V L gene. The hybridoma cells secreting anti idiotypic monoclonal antibody NP30 of Schistosoma japonicum were cultured and their genome DNAs were extracted and used as templates for PCR. The PCR product was then cloned into pUC19 vector. The recombinants were sequenced by Sanger′s method. The V L gene was compared with GenBank and published mouse V L genes. [Results] The full length of V L gene was 318 bp. The V L gene was a member of mouse Ig κ light chain subgroup IV and generated from rearrangement of germ line V and Jκ 4 genes. The V L gene sequence has been registered by GenBank(accession No. AF206720). [Conclusion] The obtained V L gene was a potentially functional gene of anti idiotypic monoclonal antibody NP30 of Schistosoma japonicum .

Key words: Schistosoma japonicum, anti idiotypic antibody, gene amplification, sequence analysis