摘要
通过对多种鸡球虫和松鼠球虫18SrRNA和28SrRNA进行序列比对分析,在18SrRNA 3′端和28SrRNA 5′端保守区设计艾美耳属通用引物,以斯氏艾美耳球虫洛阳分离株LY卵囊基因组DNA为模板首次成功克隆到斯氏艾美耳球虫完整的ITS1-5.8SrRNA-ITS2序列,其大小为1 178bp,其中ITS1序列长度为423bp,5.8SrRNA为155bp,ITS2为600bp,斯氏艾美耳球虫LY株ITS1/2序列高度变异,与鸡球虫、啮齿动物球虫的序列相似性低于60%。然后在斯氏艾美耳球虫ITS1/2序列超变区设计种特异引物,建立了灵敏、特异的PCR检测方法。本研究结果将为兔球虫强致病种的临床诊断和揭示兔球虫种群遗传特征提供有效的分子工具。
18S rRNA and 28S rRNA sequences of several Eimeria species from chickens and squir- rels were aligned to design common primers for Eirneria parasites from various hosts based on the conserved sequences of both 3＇ end of 18S rRNA and 5r end of 28S rRNA. 1 178 bp of the ITS1- 5.8S rRNA-ITS2 complete sequence of E. stiedai, including 423 bp of ITS1, 155 bp of 5.8S rRNA, and 600 bp of ITS2, was firstly cloned with the common primers and genomic DNA of oocysts of LY isolate as templates. In contrast to 5. 8S rRNA fragment, ITS1 and ITS2 sequences of E. stiedai LY isolate was more variable, and less than 60% of ITS1 and ITS2 sequences of LY isolate was identical to those of Eimeria species in chickens and other rodent hosts. A sensitive and specific PCR diagnostic assay based on the ITS1-5. 8S rRNA-ITS2 sequence was developed to identify E. stiedai, one of high pathogenic species from rabbits by designing specific primers for E. stiedai at the mutative sites of ITS1 and ITS2. These findings will provide a powerful tool for clinical differentiation of high pathogenic Eimeria species in rab- bits and revealing population genetic characteristics of rabbit coccidia.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2012年第6期1003-1008,共6页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
国家自然科学基金项目(31001058)
国家兔产业技术体系项目(nycytx-44)资助
