Abstract
Piroplasmosis is a serious debilitating and sometimes fatal disease. Phylogenetic relationships within piroplasmida are complex and remain unclear. In the study, we assessed the relative resolution capabilities of the DNA sequences of the nuclear genes 40S ribosomal protein S5 (RPS5) and mitochondrial DNA Cytochrome c oxidase subunit III (cox3) gene in the phylogeny of Babesia and Theileria species isolates. We demonstrated that by using the cox3 gene can recover a better supported species tree for some Theileria species than when using the nuclear RPS5 gene alone, it tends to intra-specific diversity and considerable inter-specific difference. Additionally, the combined DNA sequences of the nuclear RPS5 and cox3 gene improved the inference of evolutionary relationships among Babesia and Theileria species. The mitochondrial cox3 gene outperforms nuclear RPS5 gene and yields better resolution on the intra-specific diversity of Babesia and Theileria species. However, the combined RPS5 nuclear DNA and cox3 DNA tree had more advantage in the phylogeny of Babesia and Theileria species than that of single gene alone.
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