Cloning and characterization of a cDNA clone encoding calreticulin from Haemaphysalis qinghaiensis (Acari : Ixodidae)
文献类型： 外文期刊
第一作者： Gao, Jinliang
作者： Gao, Jinliang;Luo, Jianxun;Fan, Ruiquan;Guan, Guiquan;Liu, Zhijie;Li, Youquan;Zhao, Haiping;Ma, Miling;Liu, Junlong;Liu, Aihong;Ren, Qiaoyun;Dang, Zhisheng;Yin, Hong;Gao, Jinliang;Fingerle, Volker;Sugimoto, Chihiro
作者机构：
期刊名称：PARASITOLOGY RESEARCH （ 影响因子：2.289； 五年影响因子：2.403 ）
ISSN： 0932-0113
年卷期： 2008 年 102 卷 4 期
页码：
收录情况： SCI
摘要： The application of anti-tick vaccine has been shown to be the most promising alternative strategy compared to the current use of acaricides that suffer from a number of serious limitations. The success of this method is dependent upon identification and cloning of potential tick vaccine antigens. Previously, we have cloned 21 positive clones (named from Hq02 to Hq22) by immunoscreening complimentary DNA (cDNA) libraries of Haemaphysalis qinghaiensis; however, some of those clones did not contain open reading frames (ORF). In this study, we amplified the entire sequence of Hq07 by using rapid amplification of the cDNA ends. Hq07 contains an ORF of 1,233 bp that encodes for 410 amino acid residues with a coding capacity of 47 kDa. Search of the cloned sequences against GenBank revealed that Hq07 is a calreticulin (CRT)-similar clone and designated HqCRT. Expression analysis by reverse transcription-polymerase chain reaction showed that this gene is ubiquitously expressed at different developmental stages and in different tissues of H. qinghaiensis. The gene was expressed as glutathione S-transferase-fused proteins in a prokaryotic system. Western blot analysis revealed that native HqCRT was secreted into their hosts by ticks during blood sucking. Vaccination of sheep with rHqCRT conferred protective immunity against ticks, resulting in 54.3% mortality in adult ticks, compared to the 38.7% death rate in the control group. These results demonstrated that rHqCRT might be a useful vaccine candidate antigen for biological control of H. qinghaiensis.
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