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Infection and Immunity, April 2000, p. 1946-1952, Vol. 68, No. 4
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Expression of Polymorphic msp1beta Genes during Acute Anaplasma marginale Rickettsemia

Minerva Camacho-Nuez,1,2 Maria de Lourdes Muñoz,1 Carlos E. Suarez,3,4 Travis C. McGuire,4 Wendy C. Brown,4 and Guy H. Palmer4,*

Departamento de Genética y Biología Molecular, CINVESTAV-IPN, D.F. 07000, Mexico1; Departamento de Biología Molecular, CENSA, San José de las Lajas, Havana, Cuba2; Animal Diseases Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Pullman, Washington 99164-70303; and Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-70404

Received 14 September 1999/Returned for modification 26 October 1999/Accepted 20 December 1999

Immunization of cattle with native MSP1 induces protection against Anaplasma marginale. The native immunogen is composed of a single MSP1a protein and multiple, undefined MSP1b polypeptides. In addition to the originally sequenced gene, designated msp1beta (F1), we identified three complete msp1beta genes in the Florida strain: msp1beta (F2), msp1beta (F3), and msp1beta (F4). Each of these polymorphic genes encodes a structurally unique MSP1b protein, and unique transcripts can be identified during acute A. marginale rickettsemia. The structural polymorphism is clustered in discrete variable regions, and each MSP1b protein results from a unique mosaic of five variable regions. Although each of the MSP1b proteins in the Florida strain contains epitopes recognized by serum antibody induced by protective immunization with the native MSP1 complex, the variable regions also include epitopes expressed by some but not all of the MSP1b proteins. These data support testing recombinant vaccines composed of the multiple antigenically and structurally unique MSP1b proteins combined with MSP1a in order to mimic the efficacy of native MSP1 immunization.

* Corresponding author. Mailing address: Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040. Phone: (509) 335-6030. Fax: (509) 335-8529. E-mail: gpalmer{at}vetmed.wsu.edu.

Infection and Immunity, April 2000, p. 1946-1952, Vol. 68, No. 4
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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