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Persistence mechanisms in tick-borne diseases : tick-borne diseases | Barbet | Onderstepoort J Vet Res
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Persistence mechanisms in tick-borne diseases : tick-borne diseases

A.F. Barbet

Onderstepoort J Vet Res; Vol 76, No 1 (2009), 53-58. doi: 10.4102/ojvr.v76i1.65

Submitted: 10 September 2009
Published:  10 September 2009

Abstract

The use of new, highly sensitive diagnostic methods has revealed persistent infections to be a common feature of different tick-borne diseases, such as babesiosis, anaplasmosis and heartwater. Antigenic variation can contribute to disease persistence through the continual elaboration of new surface structures, and we know in several instances how this is achieved. Known or suspected mechanisms of persistence in babesial parasites include cytoadhesion and rapid variation of the adhesive ligand in Babesia bovis and genetic diversity in several merozoite stage proteins of different Babesia spp. In Anaplasma, extensive variation in the pfam01617 gene family accompanies cycling of organism levels in chronic infection. One result from the pioneering research at Onderstepoort is the definition of a related polymorphic gene family that is likely involved in immunity against heartwater disease. We are beginning to understand the sizes of the antigenic repertoires and full definition is close, with the possibility of applying simultaneous high-throughput sequencing to the order of 1 000 small genomes. We also, for the first time, can consider modifying these genomes and looking at effects on persistence and virulence. However, important biological questions remain unanswered; for example, why we are seeing a new emerging Anaplasma infection of humans and is infection of endothelial cells by Anaplasma significant to persistence in vivo.

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A.F. Barbet,

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Cited-By

1. Emerging perspectives in the research of bovine babesiosis and anaplasmosis
Carlos E. Suarez, Susan Noh
Veterinary Parasitology  vol: 180  issue: 1-2  first page: 109  year: 2011  
doi: 10.1016/j.vetpar.2011.05.032

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