中国寄生虫学与寄生虫病杂志 ›› 2012, Vol. 30 ›› Issue (3): 3-174-178.

• 论著 • 上一篇    下一篇

蓝氏贾第鞭毛虫基因快速标记载体的构建

巨红妹,王乙惠,张霞,王云华,李雅杰*   

  1. 大连大学医学院,大连 116622
  • 出版日期:2012-06-30 发布日期:2012-09-28

Construction of Rapid Tagging Vector of Genes in Giardia lamblia

JU Hong-mei,WANG Yi-hui,ZHANG Xia,WANG Yun-hua,LI Ya-jie*   

  1. Medical School,Dalian Uninversity,Dalian 116622,China
  • Online:2012-06-30 Published:2012-09-28

摘要: 目的  构建可快速标记蓝氏贾第鞭毛虫(简称贾第虫)基因的重组载体。  方法  采用重叠PCR法将新霉素(Neo)基因置于gdh启动子调控下,并插入pGEM-5zf载体,获得带有Neo筛选标记的重组载体pGL gdh-Neo;并将基因合成所得3′末端带有3×HA标签的多克隆位点区克隆至重组载体pGL gdh-Neo,构建可快速标记贾第虫基因的重组载体pGL MCS-3HA-gdh-Neo。以该载体标记贾第虫H2A基因验证其可用性。PCR扩增组蛋白H2A基因序列,用EcoRⅠ和SpeⅠ双酶切后克隆至重组载体pGL MCS-3HA-gdh-Neo多克隆位点区。重组质粒线性化后转染虫体,并对G418筛选所获得的H2A贾第虫重组株进行基因组PCR、蛋白质印迹(Western blotting)和免疫荧光分析。  结果  构建了带有多克隆位点区和3×HA标签的可快速标记贾第虫基因的重组载体pGL MCS-3HA-gdh-Neo,其长度为4 260 bp;H2A重组质粒稳定转染至贾第虫滋养体并正确整合至其基因组,可表达相对分子质量(Mr)为16 900的H2A(含3×HA标签)。  结论  构建了可快速标记贾第虫基因的重组载体pGL MCS-3HA-gdh-Neo。

关键词: 蓝氏贾第鞭毛虫, HA标签, 快速标记载体

Abstract: Objective   To construct a recombinant vector for rapid gene tagging in Giardia lamblia. Methods  To obtain the recombinant vector pGL gdh-Neo with the Neo selection marker, the Neo gene was put under the control of gdh promoter by overlap PCR and inserted into pGEM-5zf. A DNA fragment containing multiple cloning sites (MCS) followed by triple hemagglutinin(3HA) coding sequences was synthesized and cloned into the pGL gdh-Neo to construct a recombinant vector pGL MCS-3HA-gdh-Neo. Giardia H2A gene was selected as a tagging gene to validate the effectivity of the recombinant vector pGL MCS-3HA-gdh-Neo. The histone H2A coding sequence was amplified by PCR, digested with EcoRⅠ and SpeⅠ, and inserted into MCS of pGL MCS-3HA-gdh-Neo. The resulting plasmid was then linearized and transfected into Giardia trophozoites. The H2A recombinant strain selected by G418 was analyzed by PCR,Western blotting and immunofluorescence. Results  A rapid tagging recombinant vector with multiple cloning sites and triple hemagglutinin (3HA) was constructed with a length of 4 260 bp. The H2A recombinant vector was transfected into Giardia trophozoites and integrate into the Giardia genome at the correct locus. The HA-tagged H2A protein was expressed with a molecular weight(Mr) of 16 900.  Conclusion  A rapid tagging recombinant vector of genes in Giardia lamblia, pGL MCS-3HA-gdh-Neo, has been constructed.

Key words: Giardia lamblia, HA tag, Rapid tagging vector