农业机构知识库联盟

Sequence variation in ROP8 gene among Toxoplasma gondii isolates from different hosts and geographical localities

文献类型：外文期刊

作者： Li, Z. Y.;Wang, C. R.;Zhu, X. Q.;Li, Z. Y.;Chen, J.;Lu, J.;Zhu, X. Q.

作者机构：

关键词： Toxoplasma gondii;Toxoplasmosis;ROP8;Genotyping;Sequence diversity

期刊名称： GENETICS AND MOLECULAR RESEARCH

ISSN： 1676-5680

年卷期： 2015 年 14 卷 3 期

页码：

收录情况： SCI

摘要： The protozoan parasite Toxoplasma gondii has a worldwide distribution; it can cause serious diseases in humans and almost all other warm-blooded animals. Different genotypes of T. gondii result in different lesions in the same host. T. gondii rhoptry protein 8 (TgROP8) is a major factor of T. gondii acute virulence. We examined sequence variation in the TgROP8 gene among T. gondii isolates from different hosts and geographical localities. The TgROP8 gene was amplified from individual isolates and sequenced. A phylogenetic tree was constructed using Bayesian inference, maximum parsimony, and maximum likelihood based on the sequences obtained plus TgME49 from the ToxoDB database. The TgROP8 gene was 1728 bp in length for all the examined T. gondii strains, and their A+T contents were 45.37-45.95%. Sequence analysis detected 140 (0.06-5.56%) variable nucleotide positions resulting in 96 (0-10.78%) amino acid substitutions. Sequence variations in the TgROP8 gene resulted in polymorphic restriction sites for endonucleases BstBI, BsaI, and XhoI, which allowed the differentiation of the three classical genotype strains (types I, II, and III) by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). However, phylogenetic analyses indicated that the TgROP8 gene is not a suitable genetic marker for population studies of T. gondii.

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