A study of the systematics of Theileria spp. based upon small-subunit ribosomal RNA gene sequences

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• 作者：Joon-seok Chae ; Basil A. Allsopp ; Suryakant D. Waghela ; Jin-ho Park ; Tsutomu Kakuda ; Chihiro Sugimoto ; Maria T. E. P. Allsopp ; G. Gale Wagner and Patricia J. Holman
• 刊名：Parasitology Research
• 出版年：1999
• 出版时间：September 1999
• 年：1999
• 卷：85
• 期：11
• 页码：877-883
• 全文大小：126 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Medical Microbiology
  Microbiology
  Immunology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1955

文摘

The systematics of benign and moderately pathogenic Theileria isolates from cattle and deer originating from different geographic regions was undertaken by small-subunit ribosomal RNA (SSU rRNA) gene nucleotide-sequence analysis. A maximum-likelihood phylogenetic tree constructed from these sequences resulted in two major divisions, each with a common ancestor. One major division branches into four relatively divergent groups, including (1) bovine Theileria sp. Type D (USA and Korea), (2) T. mutans Intona and Theileria sp. MSD (Africa), (3) T. cervi (USA), and (4) well-characterized pathogenic Theileria spp. (Africa). The other major division branches into two groups: (1) T. buffeli Warwick and T. buffeli Marula and (2) a second branch of closely related isolates with SSU rRNA gene Types B, B1, C, E, and H. Putative geographically associated diversity was noted only in the Korean bovine Theileria spp. with SSU rRNA gene types C and H and in African T. mutans Intona and Theileria sp. MSD. The current results show that the United States bovine Theileria isolates are not T. mutans because they have T. buffeli Marula (Type A) and/or Type D (species undesignated) SSU rRNA gene sequences. The taxonomic separation of T. buffeli Warwick from African T. mutans is confirmed in this study.