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Infection and Immunity, May 2000, p. 2783-2790, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Serological Expression Cloning of Novel Immunoreactive Antigens of Babesia microti

Michael J. Lodes,1,* Raymond L. Houghton,1 Elizabeth S. Bruinsma,2 Raodoh Mohamath,1 Lisa D. Reynolds,1 Darin R. Benson,1 Peter J. Krause,3 Steven G. Reed,1,4 and David H. Persing2,dagger

Corixa Corporation1 and Infectious Disease Research Institute,4 Seattle, Washington; Department of Medicine and Pathology, Mayo Clinic, Rochester, Minnesota2; and University of Connecticut School of Medicine, Farmington, Connecticut3

Received 23 September 1999/Returned for modification 8 November 1999/Accepted 15 February 2000

Increased recognition of the prevalence of human babesiosis in the United States, together with rising concern about the potential for transmission of this infection by blood transfusion, has provided motivation to develop definitive serologic and molecular tests for the causative agent, Babesia microti. To develop more sensitive and specific assays for B. microti, we screened a genomic expression library with patient serum pools. This screening resulted in the identification of three classes of novel genes and an additional two novel, unrelated genes, which together encode a total of 17 unique B. microti antigens. The first class (BMN1-2 family) of genes encodes seven closely related antigens with a degenerate six-amino-acid repeat that shows limited homology to Plasmodium sp. merozoite and sporozoite surface antigens. A second class (BMN1-8 family) of genes encodes six related antigens, and the third class (BMN1-17 family) of genes encodes two related antigens. The two remaining genes code for novel and unrelated sequences. Among the three classes of antigens and remaining novel sequences, five were chosen to code for the most immunodominant antigens (BMN1-2, -9, -15, and -17 and MN-10). Western blot analysis with the resulting recombinant proteins indicated that these antigens were targets of humoral immune responses during B. microti infection in humans.


* Corresponding author. Mailing address: Corixa Corporation, 1124 Columbia St., Suite 200, Seattle, WA 98104. Phone: (206) 754-5797. Fax: (206) 754-5715. E-mail: lodes{at}corixa.com.

dagger Present address: Infectious Disease Research Institute and Corixa Corporation, Seattle, WA 98104.


Infection and Immunity, May 2000, p. 2783-2790, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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