中国寄生虫学与寄生虫病杂志 ›› 1998, Vol. 16 ›› Issue (3): 176-180.

• 论著 • 上一篇    下一篇

日本血吸虫虫卵cDNA文库的免疫筛选

周金春; 易新元; 曾庆仁; 张顺科; 蔡春   

  1. 湖南医科大学寄生虫学教研室
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1998-06-30 发布日期:1998-06-30

IMMUNOSCREENING OF SCHISTOSOMA JAPONICUM EGG cDNA LIBRARY

Zhou Jinchun; Yi Xinyuan; Zeng Qingren; Zhang Shunke; Cai Chun   

  1. Department of Parasitology; Hunan Medical University; Changsha 410078
  • Received:1900-01-01 Revised:1900-01-01 Online:1998-06-30 Published:1998-06-30

摘要: 目的:从日本血吸虫虫卵文库中筛选并鉴定出与免疫诊断及免疫预防有关的基因克隆。方法:采用S.jSEA超免疫兔血清对日本血吸虫卵文库进行筛选。先去除抗大肠杆菌抗体,经三轮筛选得到12个阳性克隆,然后,用辅助噬菌体进行体内剪切,经抗菌素平板筛选含重组质粒的阳性菌落,每个菌落分为2份,一份进行PCR扩增以测定插入片段的大小。另一份用于制备纯质粒DNA模板,进行DNA序列测定,通过GCG软件对所得DNA序列与GenBank中的序列进行同源性比较。结果:共筛得12个阳性克隆,PCR后测得其长度大多为1.2kb,其中8个与S.j热休克蛋白70的基因同源,2个与S.j钙网蛋白同源,1个与S.mimmunophilin同源,1个与S.j23kDa蛋白同源。结论:本研究首次报道用抗SEA血清对日本血吸虫虫卵文库的筛选结果,所得的12个阳性克隆均为编码日本血吸虫免疫诊断及预防有关的基因。

关键词: 日本血吸虫, 虫卵, cDNA文库, 免疫筛选

Abstract: AIM: To screen and identify genes encoding vaccine candidates and molecules with diagnostic potential from S.japonicum(S.j) egg cDNA library. METHODS: S.j egg cDNA library was screened by sera from SEA immunized rabbits. Positive clones were identified after three rounds of screening and were excised automatically in vivo with helper phage. Products of PCR were used to detect insert sizes by agarose gel electrophoresis. DNA samples were obtained by purification using mini prep kit Automatic sequencing was carried out and the sequence data were analysed using GCG softw are. RESULTS: Twelve clones were identified as positive and the inserts were around 1. 2 kb in size. Compared with DNA sequences in GenBank, eight clones were homologous to a 70 kDa S. j heatshock protein (S. j H sP70). C18 exhibited 97. 8% homology with S. j 23. C22 and C23 shared 82. 4% and 89. 5% homology with S. j calreticulin, respectively. C12w as homologous to S. mansoni (S. m. ) immunophilin. CONCLUSION: This paper first reported the results of
immuno screening S. j egg cDNA library by anti-SEA sera. Twelve positive clones were found to be related to protective immunity and/or immunodiagnosis of schistosomiasis.

Key words: Schistosoma japonicum, egg, cDNA library, immunoscreening