Abstract
The tick-borne cattle pathogen Anaplasma marginale (Rickettsiales: Anaplasmataceae) multiplies within membrane-bound inclusions in host cell cytoplasm. Many geographic isolates of A. marginale occur that vary in genotype, antigenic composition, morphology and infectivity for ticks. A tick cell culture system for propagation of A. marginale proved to be a good model for study of tick-pathogen interactions. Six major surface proteins (MSPs) identified on A. marginale from bovine erythrocytes were conserved on A. marginale derived from tick cells. MSP1a and MSP1b were adhesins for bovine erythrocytes, while only MSP1a was found to be an adhesin for tick cells. The tandemly repeated portion of MSP1a was found to be necessary and sufficient for adhesion to both tick cells and bovine erythrocytes. Infectivity of A. marginale isolates for ticks was dependent on the adhesive capacity of the isolate MSP1a, which was found to involve both the adhesive properties and sequence of the repeated peptides. Cattle immunized with A. marginale derived from bovine erythrocytes or tick cells demonstrated a differential antibody response to MSP1a and MSP1b that resulted from the differential expression of these proteins in cattle and ticks cells. MSP2, derived from a multi-gene family, was found to undergo antigenic variation in cattle and ticks and may contribute to establishment of persistent A. marginale infections. MSP1a has been used as a stable genetic marker for geographic isolates because the molecular weight varies due to differing numbers of the tandem repeats. However, phylogenetic studies of A. marginale isolates from North America using MSP1a and MSP4 demonstrated that MSP4 was a good biogeographic marker, while MSP1a varied greatly among and within geographic areas. Infection and development of A. marginale in cattle and tick cells appears to differ and to be mediated by several surface proteins encoded from the small genome.
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Kocan, K.M., De La Fuente, J., Blouin, E.F., Garcia-Garcia, J.C. (2003). Adaptations of the tick-borne pathogen, Anaplasma marginale, for survival in cattle and ticks. In: Jongejan, F., Kaufman, W.R. (eds) Ticks and Tick-Borne Pathogens. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3526-1_1
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DOI: https://doi.org/10.1007/978-94-017-3526-1_1
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