畜牧兽医学报

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莫氏巴贝斯虫裂殖子cDNA表达文库的构建及免疫学筛选

王锦明,刘军龙,刘爱红,马米玲,牛庆丽,任巧云,杨吉飞,刘志杰,李有全,罗建勋,殷宏*,关贵全*   

  1. (中国农业科学院兰州兽医研究所 家畜疫病病原生物学国家重点实验室 甘肃省动物寄生虫病重点实验室,兰州 730046)
  • 收稿日期:2012-06-07 出版日期:2012-12-26 发布日期:2012-12-26
  • 通讯作者: 殷宏,研究员,E-mail:ttbdcn@public.lz.gs.cn; 关贵全,副研究员;E-mail:guanguiquan@163.com
  • 作者简介:王锦明(1983-),山西吕梁人,硕士生,主要从事寄生虫分子生物学的研究,E-mail:wjm0403@gmail.com,Tel:0931-8342681
  • 基金资助:

    国家自然科学基金项目(31072130;30800820;30972182;31001061);甘肃省重点项目 (0801NKDA033;1002NKDA035);“973”项目 (2010CB530206);“948”项目(2010S04);国家肉牛牦牛产业体系项目(CARS-38);科技部合作专项;欧盟EPIZONE(FOOD-CT-2006-016236);ASFRISK(211691);ARBOZOONET(211757);PIROVAC (KBBE-3-245145)

Construction and Immunoscreening of a Merozoites cDNA Expression Library of Babesia motasi

WANG Jin-ming, LIU Jun-long, LIU Ai-hong, MA Mi-ling, NIU Qing-li, REN Qiao-yun, YANG Ji-fei, LIU Zhi-jie, LI You-quan, LUO Jian-xun, YIN Hong*, GUAN Gui-quan*   

  1. (State Key Laboratory of Veterinary Etiological Biology/Key Laboratory of Veterinary Parasitology of Gansu Province/ Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Science, Lanzhou 730046, China)
  • Received:2012-06-07 Online:2012-12-26 Published:2012-12-26

摘要:

为了构建莫氏巴贝斯虫(Babesia motasi)裂殖子cDNA表达文库,从中筛选和鉴定功能基因,利用差速离心法从莫氏巴贝斯虫感染的红细胞中纯化裂殖子,提取总RNA并纯化mRNA。在合成的双链cDNA两端加上含EcoRⅠ和Hind Ⅲ定向接头后连接到λ SCREEN载体上。通过体外包装形成完整的噬菌体颗粒,并用之转染ER1647,构建莫氏巴贝斯虫裂殖子的cDNA表达文库。用莫氏巴贝斯虫阳性血清筛选cDNA文库,获得的阳性克隆,经过测序和Blast软件分析鉴定,然后利用末端快速扩增技术(RACE)对筛选到的功能基因片段进行全长扩增。结果表明构建的cDNA表达文库其初级库容量约为1.0×106 PFU,扩增文库为3.5×109 PFU;通过免疫学筛选,获得50个阳性克隆。测序和Blast分析后,鉴定出10个莫氏巴贝斯虫基因片段,RACE扩增获得了其中8个基因的全长。本试验构建的莫氏巴贝斯虫裂殖子的cDNA表达文库和筛选到的10个结构和功能基因,为研究巴贝斯虫生物学特性、筛选疫苗与诊断用抗原及药物靶位奠定了基础。

Abstract:

 The objective of this study was to obtain functional genes of Babesia motasi, a cDNA expression library of the merozoites was constructed and immunoscreened with positive sera from sheep infected with B. motasi. The merozoites of B. motasi were purified from red blood cell with differential centrifugation. The mRNA was purified from extracted total RNA. Synthetized double-strand cDNA was added directional EcoRⅠ/Hind Ⅲ linkers and ligated to the EcoRⅠ/HindⅢ arms of λ screen vector. To produce a primary cDNA library of B. motasi, the phages DNA was packaged in vitro and transfected into ER1647. The positive clones were obtained by immunoscreening with the positive sera against B. motasi and amplified with rapid amplification of cDNA ends (RACE). The titers of the primary and amplified cDNA expression library were 1.0×106 PFU and 3.5×109 PFU·mL-1, respectively. The results showed that 10 genes of B. motasi were identified and the full-length of 8 genes were amplified by RACE. The cDNA expression library and genes screened provide an important material for screening and identifying candidate antigens of vaccination and diagnosis, drug targets as well studying biological characteristics of Babesia.

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