中国寄生虫学与寄生虫病杂志 ›› 2006, Vol. 24 ›› Issue (3): 11-207.

• 实验报道 • 上一篇    下一篇

检测日本血吸虫感染性钉螺PCR方法的建立

陈军虎1;闻礼永1;张旭照2;张剑锋1;俞丽玲1;洪林娣1   

  1. 1浙江省医学科学院寄生虫病研究所,世界卫生组织蠕虫病 研究合作中心, 杭州 310013; 2 浙江大学肿瘤研究所, 杭州 310009
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-06-30 发布日期:2006-06-30
  • 通讯作者: 闻礼永

Development of a PCR Assay for Detecting Schistosoma japonicum-Infected Oncomelania hupensis

CHEN Jun-hu1;WEN Li-yong1;ZHANG Xu-zhao2;ZHANG Jian-feng1;YU Li-ling1,HONG Lin-di1   

  1. 1 Institute of Parasitic Diseases,Zhejiang Academy of Medical Sciences,WHO Collaborating Center for Research on Helminthiasis,Hangzhou 310013,China; 2 Cancer Institute,Zhejiang University,Hangzhou 310009,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-06-30 Published:2006-06-30
  • Contact: WEN Li-yong1

摘要: 目的 建立灵敏、特异的检测日本血吸虫感染性钉螺的PCR方法。 方法 根据日本血吸虫18S小亚基单位核糖体核酸(18S-rRNA)基因设计1对引物,建立检测日本血吸虫感染性钉螺的PCR方法。测定PCR产物的DNA序列,稀释血吸虫毛蚴DNA进行PCR方法的灵敏性试验,扩增单尾尾蚴感染的钉螺DNA进行交叉反应试验,并根据不同稀释度的感染性钉螺DNA的扩增结果来验证PCR的群体检测效果。 结果 PCR扩增日本血吸虫感染性钉螺,得到了与靶DNA片段位置相同的产物,测序片段长度为469 bp,与靶DNA相同且序列一致,并将序列登录GenBank(注册号:DQ442999)。扩增阴性钉螺无产物出现。灵敏性试验提示,PCR可检出日本血吸虫毛蚴DNA的最低浓度为40 pg/μl;交叉反应试验显示,PCR方法不能扩增出单尾尾蚴感染钉螺的DNA;群体检测试验表明,PCR可检出感染性钉螺提取的DNA最高稀释度为1∶640。 结论 初步建立的检测日本血吸虫感染性钉螺的PCR方法灵敏、特异且具有良好的群体检测效果。

关键词: 日本血吸虫, 湖北钉螺, 聚合酶链反应, 18S小亚基单位核糖体核酸基因

Abstract: Objective To establish a sensitive and specific PCR assay for detecting Schistosoma japonicum-infected Oncomelania hupensis. Methods Based on 18S-rRNA gene of S. japonicum, a PCR assay for detecting Onc-omelania snails infected with S. japonicum was established. The PCR product was sequenced, and the sensitivity, cross-reaction and mass detection experiments of PCR assay were performed. Results The location of PCR product for detecting Oncomelania snails infected with S. japonicum was similar to the target DNA, with a length of 469 bp and the same sequence as the target DNA. It was registered in GenBank (Accession No. DQ442999). There was no PCR product for detecting uninfected snail. Experiments showed that the minimum DNA concentration of S. japoncium miracidium to be detected was 40 pg/μl. DNA from snail infected with single-tail cercaria could not be detected. The maximum dilution concentration of infected snail DNA pooled with uninfected snail DNA that could be detected was 1∶640. Conclusion The PCR assay for detecting S. japonicum-infected Oncomelania snails shows high sensitivity, specificity and effect of mass detection.

Key words: Schistosoma japonicum, Oncomelania hupensis, PCR, 18S-rRNA gene