Recent Studies on the Characterization of Anaplasma marginale Isolated from North American Bison

• Published in: Annals of the New York Academy of Sciences Vol. 1026; no. 1; pp. 114 - 117
• Main Authors: KOCAN, KATHERINE M., DE LA FUENTE, JOSÉ, GOLSTEYN THOMAS, ELIZABETH J., VAN DEN BUSSCHE, RONALD A., HAMILTON, ROBERT G., TANAKA, ELAINE E., DRUHAN, SUSAN E.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.10.2004
• Subjects: Anaplasma marginale; Anaplasma marginale - classification; Anaplasma marginale - genetics; Anaplasma marginale - isolation & purification; Anaplasmosis - genetics; Animals; Bison; Bison - microbiology; Bison bison bison; cattle; Dermacentor variabilis; DNA, Bacterial - analysis; Ixodidae; major surface protein; North America; Phylogeny; Rickettsiales; Sequence Analysis, DNA; Tandem Repeat Sequences; Ticks; North America
• ISSN: 0077-8923; 1749-6632
• DOI: 10.1196/annals.1307.015

: Anaplasma marginale (Rickettsiales: Anaplasmataceae), a tick‐borne pathogen of cattle, is endemic in tropical and subtropical regions of the world. Many geographic isolates of A. marginale occur worldwide that have been identified by major surface protein (MSP) 1a, which varies in sequence and molecular weight owing to different numbers of tandem 28‐29 amino acid repeats. Although serologic tests have identified American bison, Bison bison, as being infected with A. marginale, the present studies were undertaken to confirm A. marginale infection in bison, to characterize bison isolates, and to compare the phylogenetic relationship of the bison isolates with other A. marginale isolates from North America. Nine A. marginale isolates derived from Canadian bison possessed identical msp4 sequences with one characteristic silent nucleotide change. The sequence of MSP1a was determined for one Canadian and two U.S. bison isolates of A. marginale, and these isolates contained 4 and 5 tandem repeats, respectively. One U.S. bison isolate tested for infectivity proved to be infective for cattle and transmitted by Dermacentor variabilis ticks. the results of this study demonstrated that these A. marginale isolates obtained from bison were similar to ones derived from naturally infected cattle.