A study of the systematics of Theileria spp. based upon small-subunit ribosomal RNA gene sequences |
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Authors: | Joon-seok Chae Basil A Allsopp Suryakant D Waghela Jin-ho Park Tsutomu Kakuda Chihiro Sugimoto Maria T E P Allsopp G Gale Wagner Patricia J Holman |
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Institution: | (1) Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA, US;(2) Department of Veterinary Pathobiology, The Texas Veterinary Medical Center, Texas A&M University, College Station, TX 77843-4467, USA e-mail: pholman@cvm.tamu.edu Tel.: +1-409-8454275; Fax: +1-409-8622344, US;(3) Onderstepoort Veterinary Institute, Private Bag X5, Onderstepoort 0110, South Africa, ZA;(4) College of Veterinary Medicine, Chonbuk National University, Chonju, Chonbuk 560-756, Korea, KR;(5) Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060, Japan, JP |
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Abstract: | 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.
Received: 11 March 1999 / Accepted: 28 May 1999 |
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