日本血吸虫新基因的克隆及分析

Cloning and characterization of new genes of Schistosoma japonicum

目的:克隆并分析日本血吸虫(Schistosomajaponicum,Sj)新基因,提供有效的疫苗候选分子。方法用Sj雄虫可溶性抗原免疫家兔血清为探针筛选Sj成虫cDNA文库,将所获阳性克隆的插入片断进行PCR扩增并测序,通过互联网NCBIGenBank和蛋白质分析软件进行分析。结果:共筛选得11个阳性克隆,经分析有2个新基因,分别是Sj P8(GenBank注册号AF517843)和Sj肌球蛋白cDNA序列(GenBank注册号AY770506),分别编码含75个氨基酸的跨膜蛋白和含212个氨基酸的蛋白片断。结论:Sj P8和Sj肌球蛋白cDNA序列可能为日本血吸虫疫苗的研究提供有价值的材料。

Objective To clone and characterize new genes of Schistosoma japonicum, Sj , and to provide efficient vaccine candidates. Methods Sj adult cDNA library was screened with rabbit sera raised against male worm soluble antigen. The inserted cDNA fragments from the positively selected clones were amplified with PCR and further sequenced, as well as characterized through internet NCBI GenBank software. Results Eleven positive clones were obtained and two were verified by GenBank as new, including a novel gene designated as Sj -P8 (GenBank accession No. AF517843) and a new partial cDNA of Sj myosin (GenBank accession No. AY770506). The two new genes encoded a transmembrane protein of 75 amino acids and a myosin protein fragment of 212 amino acids respectively. Conclusion The newly obtained genes may provide useful information for the research on Sj vaccine.