Abstract.
The phylogenetic relationship of Theileria and Babesia species infecting sheep and goats on the basis of their 18S RNA gene structure was addressed in the present study. For this purpose, the complete sequences of the small ribosomal RNA genes of a panel of sheep and goat piroplasm isolates, including T. lestoquardi, T. ovis, T. separata, B. ovis, B. motasi, B. crassa and several novel species, were sequenced and compared. The classification based on the established phylogenetic tree corresponded with traditional systematics and revealed that sheep/goat piroplasm species are of polyphyletic origin. The independent evolution of almost all sheep/goat piroplasms suggests that speciation may have occurred after transfer of the piroplasm-transmitting tick from a primal wild ruminant host to domestic sheep and goats. In accordance with recent reports, our study confirms the existence of at least two additional sheep/goat piroplasm species, designated Theileria sp. 1 (China) and Theileria sp. 2 (China). The recently reported pathogenic sheep/goat Theileria sp. 1 (China) seems to be identical with a Theileria sp. isolated from Japanese serow. Furthermore, our results suggest that T. ovis represents a single species.
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Acknowledgements.
This work was supported by European Union INCO-DEV programmes: (1) contract ICA4-CT2000-300028 entitled ″Molecular and immunological characterisation of merozoite antigens and their encoding genes of a Theileria species highly pathogenic for small ruminants in China: application for the development of diagnostics and vaccine″, (2) contract ICB1CT-2000-80004 entitled ″Theileria China antigens: application for the development of diagnostics and vaccines for small ruminants in China. Bursary for Y.H.″ and (3) contract ICA4-CT-2000-30006 entitled ″International consortium on ticks and tick-borne diseases (ICTTS-2)″.
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Schnittger, L., Yin, H., Gubbels, M.J. et al. Phylogeny of sheep and goat Theileria and Babesia parasites. Parasitol Res 91, 398–406 (2003). https://doi.org/10.1007/s00436-003-0979-2
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DOI: https://doi.org/10.1007/s00436-003-0979-2