中国寄生虫学与寄生虫病杂志 ›› 1997, Vol. 15 ›› Issue (1): 4-20.

• 论著 • 上一篇    下一篇

囊虫病诊断用抗原编码cDNA的分子克隆

孙树汉1,王俊霞2,陈蕊雯1,陆惠萍1,彭郁葱2,王朝霞2   

  1. 1 第二军医大学分子遗传学教研室 上海2004332 河北医科大学分子生物学教研室 石家庄050017
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1997-02-28 发布日期:1997-02-28

MOLECULAR CLONING OF cDNA ENCODING IMMUNODIAGNOSTIC ANTIGENS OF CYSTICERCOSIS

Sun Shuhan1, Wang Junxia2, Chen Ruiwen1, Lu Huiping1, Peng Yucong2, Wang Zhaoxia2   

  1. 1 Department of Molecular Genetic, Second Military Medical University, Shanghai 2004332 Department of Molecular Biology, Hebei Medical University , Shijiazhuang 050017
  • Received:1900-01-01 Revised:1900-01-01 Online:1997-02-28 Published:1997-02-28

摘要:

目的: 克隆与分析囊虫病诊断用抗原及其编码基因。方法: 采用基因重组技术, 构建来源于猪囊尾蚴mRNA 的cDNA 文库。以囊虫病患者、囊虫病病猪的血清为探针从cDNA 文库中筛选出目的克隆。结果: 获得人、猪共同抗原2个(分子量分别为28 kDa 和18 kDa) , 人特异性抗原和猪特异性抗原各1个(分子量为34 kDa、14 kDa)。这些抗原的编码克隆分别命名为λcC1、λcC2、λcH1 及λcP1。cC1 cDNA 含有编码28 kDa 的人、猪共同抗原的完整基因, 全长1070 bp,起始密码(ATG) 从自22 bp , 终止密码(TGA) 结于747 bp , 长为747 bp 的开放阅读框架编码由249 个氨基酸组成的多肽, 其理论推导分子量为27.36 kDa。结论: 以cC1 等融合蛋白为诊断用抗原, 具有高度的特异性和较理想的敏感性。

关键词: 囊虫病, 猪囊尾蚴, cDNA 文库, 抗原多肽, 分子克隆

Abstract:

AIM: To clone and analyze the cDNA encoding immunodiagnostic antigen of cysticercosis. METHODS: Immunodiagnostic antigens of cysticercosis were obtained studied using recombinant DNA techniques. cDNA was synthesized from mRNA and a λgt11 expression library was constructed and immunoscreened with human and/or pig cysticercosis sera. RESULTS: Four positive cDNA clones (λcC1、λcC2、λcH1 and λcP1) were isolated. The λcC1 cDNA was 1 070 bp in length and consisted of a single open reading frame. The open reading frame of 747 bp encoded a polypeptide of 249 amino acids with a molecular weight of 27.36 kDa. The λcC1 fusion protein was identified as an common antigen for immunodiagnosis of both human and pig cysticercosis. CONCLUSION: The λcC1 fusion protein was highly sensitive and specific as compared to crude somatic antigen for the immunodiagnosis of cysticercosis.

Key words: Cysticercosis, Cysticercus cellulosae, cDNA library, antigenic polypeptide, molecular cloning